ieee1394: merge from Linus
[linux-3.10.git] / drivers / ieee1394 / ohci1394.c
1 /*
2  * ohci1394.c - driver for OHCI 1394 boards
3  * Copyright (C)1999,2000 Sebastien Rougeaux <sebastien.rougeaux@anu.edu.au>
4  *                        Gord Peters <GordPeters@smarttech.com>
5  *              2001      Ben Collins <bcollins@debian.org>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software Foundation,
19  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20  */
21
22 /*
23  * Things known to be working:
24  * . Async Request Transmit
25  * . Async Response Receive
26  * . Async Request Receive
27  * . Async Response Transmit
28  * . Iso Receive
29  * . DMA mmap for iso receive
30  * . Config ROM generation
31  *
32  * Things implemented, but still in test phase:
33  * . Iso Transmit
34  * . Async Stream Packets Transmit (Receive done via Iso interface)
35  *
36  * Things not implemented:
37  * . DMA error recovery
38  *
39  * Known bugs:
40  * . devctl BUS_RESET arg confusion (reset type or root holdoff?)
41  *   added LONG_RESET_ROOT and SHORT_RESET_ROOT for root holdoff --kk
42  */
43
44 /*
45  * Acknowledgments:
46  *
47  * Adam J Richter <adam@yggdrasil.com>
48  *  . Use of pci_class to find device
49  *
50  * Emilie Chung <emilie.chung@axis.com>
51  *  . Tip on Async Request Filter
52  *
53  * Pascal Drolet <pascal.drolet@informission.ca>
54  *  . Various tips for optimization and functionnalities
55  *
56  * Robert Ficklin <rficklin@westengineering.com>
57  *  . Loop in irq_handler
58  *
59  * James Goodwin <jamesg@Filanet.com>
60  *  . Various tips on initialization, self-id reception, etc.
61  *
62  * Albrecht Dress <ad@mpifr-bonn.mpg.de>
63  *  . Apple PowerBook detection
64  *
65  * Daniel Kobras <daniel.kobras@student.uni-tuebingen.de>
66  *  . Reset the board properly before leaving + misc cleanups
67  *
68  * Leon van Stuivenberg <leonvs@iae.nl>
69  *  . Bug fixes
70  *
71  * Ben Collins <bcollins@debian.org>
72  *  . Working big-endian support
73  *  . Updated to 2.4.x module scheme (PCI aswell)
74  *  . Config ROM generation
75  *
76  * Manfred Weihs <weihs@ict.tuwien.ac.at>
77  *  . Reworked code for initiating bus resets
78  *    (long, short, with or without hold-off)
79  *
80  * Nandu Santhi <contactnandu@users.sourceforge.net>
81  *  . Added support for nVidia nForce2 onboard Firewire chipset
82  *
83  */
84
85 #include <linux/kernel.h>
86 #include <linux/list.h>
87 #include <linux/slab.h>
88 #include <linux/interrupt.h>
89 #include <linux/wait.h>
90 #include <linux/errno.h>
91 #include <linux/module.h>
92 #include <linux/moduleparam.h>
93 #include <linux/pci.h>
94 #include <linux/fs.h>
95 #include <linux/poll.h>
96 #include <asm/byteorder.h>
97 #include <asm/atomic.h>
98 #include <asm/uaccess.h>
99 #include <linux/delay.h>
100 #include <linux/spinlock.h>
101
102 #include <asm/pgtable.h>
103 #include <asm/page.h>
104 #include <asm/irq.h>
105 #include <linux/sched.h>
106 #include <linux/types.h>
107 #include <linux/vmalloc.h>
108 #include <linux/init.h>
109
110 #ifdef CONFIG_PPC_PMAC
111 #include <asm/machdep.h>
112 #include <asm/pmac_feature.h>
113 #include <asm/prom.h>
114 #include <asm/pci-bridge.h>
115 #endif
116
117 #include "csr1212.h"
118 #include "ieee1394.h"
119 #include "ieee1394_types.h"
120 #include "hosts.h"
121 #include "dma.h"
122 #include "iso.h"
123 #include "ieee1394_core.h"
124 #include "highlevel.h"
125 #include "ohci1394.h"
126
127 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
128 #define OHCI1394_DEBUG
129 #endif
130
131 #ifdef DBGMSG
132 #undef DBGMSG
133 #endif
134
135 #ifdef OHCI1394_DEBUG
136 #define DBGMSG(fmt, args...) \
137 printk(KERN_INFO "%s: fw-host%d: " fmt "\n" , OHCI1394_DRIVER_NAME, ohci->host->id , ## args)
138 #else
139 #define DBGMSG(fmt, args...)
140 #endif
141
142 #ifdef CONFIG_IEEE1394_OHCI_DMA_DEBUG
143 #define OHCI_DMA_ALLOC(fmt, args...) \
144         HPSB_ERR("%s(%s)alloc(%d): "fmt, OHCI1394_DRIVER_NAME, __FUNCTION__, \
145                 ++global_outstanding_dmas, ## args)
146 #define OHCI_DMA_FREE(fmt, args...) \
147         HPSB_ERR("%s(%s)free(%d): "fmt, OHCI1394_DRIVER_NAME, __FUNCTION__, \
148                 --global_outstanding_dmas, ## args)
149 static int global_outstanding_dmas = 0;
150 #else
151 #define OHCI_DMA_ALLOC(fmt, args...)
152 #define OHCI_DMA_FREE(fmt, args...)
153 #endif
154
155 /* print general (card independent) information */
156 #define PRINT_G(level, fmt, args...) \
157 printk(level "%s: " fmt "\n" , OHCI1394_DRIVER_NAME , ## args)
158
159 /* print card specific information */
160 #define PRINT(level, fmt, args...) \
161 printk(level "%s: fw-host%d: " fmt "\n" , OHCI1394_DRIVER_NAME, ohci->host->id , ## args)
162
163 /* Module Parameters */
164 static int phys_dma = 1;
165 module_param(phys_dma, int, 0444);
166 MODULE_PARM_DESC(phys_dma, "Enable physical dma (default = 1).");
167
168 static void dma_trm_tasklet(unsigned long data);
169 static void dma_trm_reset(struct dma_trm_ctx *d);
170
171 static int alloc_dma_rcv_ctx(struct ti_ohci *ohci, struct dma_rcv_ctx *d,
172                              enum context_type type, int ctx, int num_desc,
173                              int buf_size, int split_buf_size, int context_base);
174 static void stop_dma_rcv_ctx(struct dma_rcv_ctx *d);
175 static void free_dma_rcv_ctx(struct dma_rcv_ctx *d);
176
177 static int alloc_dma_trm_ctx(struct ti_ohci *ohci, struct dma_trm_ctx *d,
178                              enum context_type type, int ctx, int num_desc,
179                              int context_base);
180
181 static void ohci1394_pci_remove(struct pci_dev *pdev);
182
183 #ifndef __LITTLE_ENDIAN
184 static unsigned hdr_sizes[] =
185 {
186         3,      /* TCODE_WRITEQ */
187         4,      /* TCODE_WRITEB */
188         3,      /* TCODE_WRITE_RESPONSE */
189         0,      /* ??? */
190         3,      /* TCODE_READQ */
191         4,      /* TCODE_READB */
192         3,      /* TCODE_READQ_RESPONSE */
193         4,      /* TCODE_READB_RESPONSE */
194         1,      /* TCODE_CYCLE_START (???) */
195         4,      /* TCODE_LOCK_REQUEST */
196         2,      /* TCODE_ISO_DATA */
197         4,      /* TCODE_LOCK_RESPONSE */
198 };
199
200 /* Swap headers */
201 static inline void packet_swab(quadlet_t *data, int tcode)
202 {
203         size_t size = hdr_sizes[tcode];
204
205         if (tcode > TCODE_LOCK_RESPONSE || hdr_sizes[tcode] == 0)
206                 return;
207
208         while (size--)
209                 data[size] = swab32(data[size]);
210 }
211 #else
212 /* Don't waste cycles on same sex byte swaps */
213 #define packet_swab(w,x)
214 #endif /* !LITTLE_ENDIAN */
215
216 /***********************************
217  * IEEE-1394 functionality section *
218  ***********************************/
219
220 static u8 get_phy_reg(struct ti_ohci *ohci, u8 addr)
221 {
222         int i;
223         unsigned long flags;
224         quadlet_t r;
225
226         spin_lock_irqsave (&ohci->phy_reg_lock, flags);
227
228         reg_write(ohci, OHCI1394_PhyControl, (addr << 8) | 0x00008000);
229
230         for (i = 0; i < OHCI_LOOP_COUNT; i++) {
231                 if (reg_read(ohci, OHCI1394_PhyControl) & 0x80000000)
232                         break;
233
234                 mdelay(1);
235         }
236
237         r = reg_read(ohci, OHCI1394_PhyControl);
238
239         if (i >= OHCI_LOOP_COUNT)
240                 PRINT (KERN_ERR, "Get PHY Reg timeout [0x%08x/0x%08x/%d]",
241                        r, r & 0x80000000, i);
242
243         spin_unlock_irqrestore (&ohci->phy_reg_lock, flags);
244
245         return (r & 0x00ff0000) >> 16;
246 }
247
248 static void set_phy_reg(struct ti_ohci *ohci, u8 addr, u8 data)
249 {
250         int i;
251         unsigned long flags;
252         u32 r = 0;
253
254         spin_lock_irqsave (&ohci->phy_reg_lock, flags);
255
256         reg_write(ohci, OHCI1394_PhyControl, (addr << 8) | data | 0x00004000);
257
258         for (i = 0; i < OHCI_LOOP_COUNT; i++) {
259                 r = reg_read(ohci, OHCI1394_PhyControl);
260                 if (!(r & 0x00004000))
261                         break;
262
263                 mdelay(1);
264         }
265
266         if (i == OHCI_LOOP_COUNT)
267                 PRINT (KERN_ERR, "Set PHY Reg timeout [0x%08x/0x%08x/%d]",
268                        r, r & 0x00004000, i);
269
270         spin_unlock_irqrestore (&ohci->phy_reg_lock, flags);
271
272         return;
273 }
274
275 /* Or's our value into the current value */
276 static void set_phy_reg_mask(struct ti_ohci *ohci, u8 addr, u8 data)
277 {
278         u8 old;
279
280         old = get_phy_reg (ohci, addr);
281         old |= data;
282         set_phy_reg (ohci, addr, old);
283
284         return;
285 }
286
287 static void handle_selfid(struct ti_ohci *ohci, struct hpsb_host *host,
288                                 int phyid, int isroot)
289 {
290         quadlet_t *q = ohci->selfid_buf_cpu;
291         quadlet_t self_id_count=reg_read(ohci, OHCI1394_SelfIDCount);
292         size_t size;
293         quadlet_t q0, q1;
294
295         /* Check status of self-id reception */
296
297         if (ohci->selfid_swap)
298                 q0 = le32_to_cpu(q[0]);
299         else
300                 q0 = q[0];
301
302         if ((self_id_count & 0x80000000) ||
303             ((self_id_count & 0x00FF0000) != (q0 & 0x00FF0000))) {
304                 PRINT(KERN_ERR,
305                       "Error in reception of SelfID packets [0x%08x/0x%08x] (count: %d)",
306                       self_id_count, q0, ohci->self_id_errors);
307
308                 /* Tip by James Goodwin <jamesg@Filanet.com>:
309                  * We had an error, generate another bus reset in response.  */
310                 if (ohci->self_id_errors<OHCI1394_MAX_SELF_ID_ERRORS) {
311                         set_phy_reg_mask (ohci, 1, 0x40);
312                         ohci->self_id_errors++;
313                 } else {
314                         PRINT(KERN_ERR,
315                               "Too many errors on SelfID error reception, giving up!");
316                 }
317                 return;
318         }
319
320         /* SelfID Ok, reset error counter. */
321         ohci->self_id_errors = 0;
322
323         size = ((self_id_count & 0x00001FFC) >> 2) - 1;
324         q++;
325
326         while (size > 0) {
327                 if (ohci->selfid_swap) {
328                         q0 = le32_to_cpu(q[0]);
329                         q1 = le32_to_cpu(q[1]);
330                 } else {
331                         q0 = q[0];
332                         q1 = q[1];
333                 }
334
335                 if (q0 == ~q1) {
336                         DBGMSG ("SelfID packet 0x%x received", q0);
337                         hpsb_selfid_received(host, cpu_to_be32(q0));
338                         if (((q0 & 0x3f000000) >> 24) == phyid)
339                                 DBGMSG ("SelfID for this node is 0x%08x", q0);
340                 } else {
341                         PRINT(KERN_ERR,
342                               "SelfID is inconsistent [0x%08x/0x%08x]", q0, q1);
343                 }
344                 q += 2;
345                 size -= 2;
346         }
347
348         DBGMSG("SelfID complete");
349
350         return;
351 }
352
353 static void ohci_soft_reset(struct ti_ohci *ohci) {
354         int i;
355
356         reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_softReset);
357
358         for (i = 0; i < OHCI_LOOP_COUNT; i++) {
359                 if (!(reg_read(ohci, OHCI1394_HCControlSet) & OHCI1394_HCControl_softReset))
360                         break;
361                 mdelay(1);
362         }
363         DBGMSG ("Soft reset finished");
364 }
365
366
367 /* Generate the dma receive prgs and start the context */
368 static void initialize_dma_rcv_ctx(struct dma_rcv_ctx *d, int generate_irq)
369 {
370         struct ti_ohci *ohci = (struct ti_ohci*)(d->ohci);
371         int i;
372
373         ohci1394_stop_context(ohci, d->ctrlClear, NULL);
374
375         for (i=0; i<d->num_desc; i++) {
376                 u32 c;
377
378                 c = DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE | DMA_CTL_BRANCH;
379                 if (generate_irq)
380                         c |= DMA_CTL_IRQ;
381
382                 d->prg_cpu[i]->control = cpu_to_le32(c | d->buf_size);
383
384                 /* End of descriptor list? */
385                 if (i + 1 < d->num_desc) {
386                         d->prg_cpu[i]->branchAddress =
387                                 cpu_to_le32((d->prg_bus[i+1] & 0xfffffff0) | 0x1);
388                 } else {
389                         d->prg_cpu[i]->branchAddress =
390                                 cpu_to_le32((d->prg_bus[0] & 0xfffffff0));
391                 }
392
393                 d->prg_cpu[i]->address = cpu_to_le32(d->buf_bus[i]);
394                 d->prg_cpu[i]->status = cpu_to_le32(d->buf_size);
395         }
396
397         d->buf_ind = 0;
398         d->buf_offset = 0;
399
400         if (d->type == DMA_CTX_ISO) {
401                 /* Clear contextControl */
402                 reg_write(ohci, d->ctrlClear, 0xffffffff);
403
404                 /* Set bufferFill, isochHeader, multichannel for IR context */
405                 reg_write(ohci, d->ctrlSet, 0xd0000000);
406
407                 /* Set the context match register to match on all tags */
408                 reg_write(ohci, d->ctxtMatch, 0xf0000000);
409
410                 /* Clear the multi channel mask high and low registers */
411                 reg_write(ohci, OHCI1394_IRMultiChanMaskHiClear, 0xffffffff);
412                 reg_write(ohci, OHCI1394_IRMultiChanMaskLoClear, 0xffffffff);
413
414                 /* Set up isoRecvIntMask to generate interrupts */
415                 reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, 1 << d->ctx);
416         }
417
418         /* Tell the controller where the first AR program is */
419         reg_write(ohci, d->cmdPtr, d->prg_bus[0] | 0x1);
420
421         /* Run context */
422         reg_write(ohci, d->ctrlSet, 0x00008000);
423
424         DBGMSG("Receive DMA ctx=%d initialized", d->ctx);
425 }
426
427 /* Initialize the dma transmit context */
428 static void initialize_dma_trm_ctx(struct dma_trm_ctx *d)
429 {
430         struct ti_ohci *ohci = (struct ti_ohci*)(d->ohci);
431
432         /* Stop the context */
433         ohci1394_stop_context(ohci, d->ctrlClear, NULL);
434
435         d->prg_ind = 0;
436         d->sent_ind = 0;
437         d->free_prgs = d->num_desc;
438         d->branchAddrPtr = NULL;
439         INIT_LIST_HEAD(&d->fifo_list);
440         INIT_LIST_HEAD(&d->pending_list);
441
442         if (d->type == DMA_CTX_ISO) {
443                 /* enable interrupts */
444                 reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, 1 << d->ctx);
445         }
446
447         DBGMSG("Transmit DMA ctx=%d initialized", d->ctx);
448 }
449
450 /* Count the number of available iso contexts */
451 static int get_nb_iso_ctx(struct ti_ohci *ohci, int reg)
452 {
453         int i,ctx=0;
454         u32 tmp;
455
456         reg_write(ohci, reg, 0xffffffff);
457         tmp = reg_read(ohci, reg);
458
459         DBGMSG("Iso contexts reg: %08x implemented: %08x", reg, tmp);
460
461         /* Count the number of contexts */
462         for (i=0; i<32; i++) {
463                 if (tmp & 1) ctx++;
464                 tmp >>= 1;
465         }
466         return ctx;
467 }
468
469 /* Global initialization */
470 static void ohci_initialize(struct ti_ohci *ohci)
471 {
472         char irq_buf[16];
473         quadlet_t buf;
474         int num_ports, i;
475
476         spin_lock_init(&ohci->phy_reg_lock);
477
478         /* Put some defaults to these undefined bus options */
479         buf = reg_read(ohci, OHCI1394_BusOptions);
480         buf |=  0x60000000; /* Enable CMC and ISC */
481         if (hpsb_disable_irm)
482                 buf &= ~0x80000000;
483         else
484                 buf |=  0x80000000; /* Enable IRMC */
485         buf &= ~0x00ff0000; /* XXX: Set cyc_clk_acc to zero for now */
486         buf &= ~0x18000000; /* Disable PMC and BMC */
487         reg_write(ohci, OHCI1394_BusOptions, buf);
488
489         /* Set the bus number */
490         reg_write(ohci, OHCI1394_NodeID, 0x0000ffc0);
491
492         /* Enable posted writes */
493         reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_postedWriteEnable);
494
495         /* Clear link control register */
496         reg_write(ohci, OHCI1394_LinkControlClear, 0xffffffff);
497
498         /* Enable cycle timer and cycle master and set the IRM
499          * contender bit in our self ID packets if appropriate. */
500         reg_write(ohci, OHCI1394_LinkControlSet,
501                   OHCI1394_LinkControl_CycleTimerEnable |
502                   OHCI1394_LinkControl_CycleMaster);
503         i = get_phy_reg(ohci, 4) | PHY_04_LCTRL;
504         if (hpsb_disable_irm)
505                 i &= ~PHY_04_CONTENDER;
506         else
507                 i |= PHY_04_CONTENDER;
508         set_phy_reg(ohci, 4, i);
509
510         /* Set up self-id dma buffer */
511         reg_write(ohci, OHCI1394_SelfIDBuffer, ohci->selfid_buf_bus);
512
513         /* enable self-id and phys */
514         reg_write(ohci, OHCI1394_LinkControlSet, OHCI1394_LinkControl_RcvSelfID |
515                   OHCI1394_LinkControl_RcvPhyPkt);
516
517         /* Set the Config ROM mapping register */
518         reg_write(ohci, OHCI1394_ConfigROMmap, ohci->csr_config_rom_bus);
519
520         /* Now get our max packet size */
521         ohci->max_packet_size =
522                 1<<(((reg_read(ohci, OHCI1394_BusOptions)>>12)&0xf)+1);
523                 
524         /* Don't accept phy packets into AR request context */
525         reg_write(ohci, OHCI1394_LinkControlClear, 0x00000400);
526
527         /* Clear the interrupt mask */
528         reg_write(ohci, OHCI1394_IsoRecvIntMaskClear, 0xffffffff);
529         reg_write(ohci, OHCI1394_IsoRecvIntEventClear, 0xffffffff);
530
531         /* Clear the interrupt mask */
532         reg_write(ohci, OHCI1394_IsoXmitIntMaskClear, 0xffffffff);
533         reg_write(ohci, OHCI1394_IsoXmitIntEventClear, 0xffffffff);
534
535         /* Initialize AR dma */
536         initialize_dma_rcv_ctx(&ohci->ar_req_context, 0);
537         initialize_dma_rcv_ctx(&ohci->ar_resp_context, 0);
538
539         /* Initialize AT dma */
540         initialize_dma_trm_ctx(&ohci->at_req_context);
541         initialize_dma_trm_ctx(&ohci->at_resp_context);
542         
543         /* Initialize IR Legacy DMA channel mask */
544         ohci->ir_legacy_channels = 0;
545
546         /* Accept AR requests from all nodes */
547         reg_write(ohci, OHCI1394_AsReqFilterHiSet, 0x80000000);
548
549         /* Set the address range of the physical response unit.
550          * Most controllers do not implement it as a writable register though.
551          * They will keep a hardwired offset of 0x00010000 and show 0x0 as
552          * register content.
553          * To actually enable physical responses is the job of our interrupt
554          * handler which programs the physical request filter. */
555         reg_write(ohci, OHCI1394_PhyUpperBound,
556                   OHCI1394_PHYS_UPPER_BOUND_PROGRAMMED >> 16);
557
558         DBGMSG("physUpperBoundOffset=%08x",
559                reg_read(ohci, OHCI1394_PhyUpperBound));
560
561         /* Specify AT retries */
562         reg_write(ohci, OHCI1394_ATRetries,
563                   OHCI1394_MAX_AT_REQ_RETRIES |
564                   (OHCI1394_MAX_AT_RESP_RETRIES<<4) |
565                   (OHCI1394_MAX_PHYS_RESP_RETRIES<<8));
566
567         /* We don't want hardware swapping */
568         reg_write(ohci, OHCI1394_HCControlClear, OHCI1394_HCControl_noByteSwap);
569
570         /* Enable interrupts */
571         reg_write(ohci, OHCI1394_IntMaskSet,
572                   OHCI1394_unrecoverableError |
573                   OHCI1394_masterIntEnable |
574                   OHCI1394_busReset |
575                   OHCI1394_selfIDComplete |
576                   OHCI1394_RSPkt |
577                   OHCI1394_RQPkt |
578                   OHCI1394_respTxComplete |
579                   OHCI1394_reqTxComplete |
580                   OHCI1394_isochRx |
581                   OHCI1394_isochTx |
582                   OHCI1394_postedWriteErr |
583                   OHCI1394_cycleTooLong |
584                   OHCI1394_cycleInconsistent);
585
586         /* Enable link */
587         reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_linkEnable);
588
589         buf = reg_read(ohci, OHCI1394_Version);
590         sprintf (irq_buf, "%d", ohci->dev->irq);
591         PRINT(KERN_INFO, "OHCI-1394 %d.%d (PCI): IRQ=[%s]  "
592               "MMIO=[%llx-%llx]  Max Packet=[%d]  IR/IT contexts=[%d/%d]",
593               ((((buf) >> 16) & 0xf) + (((buf) >> 20) & 0xf) * 10),
594               ((((buf) >> 4) & 0xf) + ((buf) & 0xf) * 10), irq_buf,
595               (unsigned long long)pci_resource_start(ohci->dev, 0),
596               (unsigned long long)pci_resource_start(ohci->dev, 0) + OHCI1394_REGISTER_SIZE - 1,
597               ohci->max_packet_size,
598               ohci->nb_iso_rcv_ctx, ohci->nb_iso_xmit_ctx);
599
600         /* Check all of our ports to make sure that if anything is
601          * connected, we enable that port. */
602         num_ports = get_phy_reg(ohci, 2) & 0xf;
603         for (i = 0; i < num_ports; i++) {
604                 unsigned int status;
605
606                 set_phy_reg(ohci, 7, i);
607                 status = get_phy_reg(ohci, 8);
608
609                 if (status & 0x20)
610                         set_phy_reg(ohci, 8, status & ~1);
611         }
612
613         /* Serial EEPROM Sanity check. */
614         if ((ohci->max_packet_size < 512) ||
615             (ohci->max_packet_size > 4096)) {
616                 /* Serial EEPROM contents are suspect, set a sane max packet
617                  * size and print the raw contents for bug reports if verbose
618                  * debug is enabled. */
619 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
620                 int i;
621 #endif
622
623                 PRINT(KERN_DEBUG, "Serial EEPROM has suspicious values, "
624                       "attempting to setting max_packet_size to 512 bytes");
625                 reg_write(ohci, OHCI1394_BusOptions,
626                           (reg_read(ohci, OHCI1394_BusOptions) & 0xf007) | 0x8002);
627                 ohci->max_packet_size = 512;
628 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
629                 PRINT(KERN_DEBUG, "    EEPROM Present: %d",
630                       (reg_read(ohci, OHCI1394_Version) >> 24) & 0x1);
631                 reg_write(ohci, OHCI1394_GUID_ROM, 0x80000000);
632
633                 for (i = 0;
634                      ((i < 1000) &&
635                       (reg_read(ohci, OHCI1394_GUID_ROM) & 0x80000000)); i++)
636                         udelay(10);
637
638                 for (i = 0; i < 0x20; i++) {
639                         reg_write(ohci, OHCI1394_GUID_ROM, 0x02000000);
640                         PRINT(KERN_DEBUG, "    EEPROM %02x: %02x", i,
641                               (reg_read(ohci, OHCI1394_GUID_ROM) >> 16) & 0xff);
642                 }
643 #endif
644         }
645 }
646
647 /*
648  * Insert a packet in the DMA fifo and generate the DMA prg
649  * FIXME: rewrite the program in order to accept packets crossing
650  *        page boundaries.
651  *        check also that a single dma descriptor doesn't cross a
652  *        page boundary.
653  */
654 static void insert_packet(struct ti_ohci *ohci,
655                           struct dma_trm_ctx *d, struct hpsb_packet *packet)
656 {
657         u32 cycleTimer;
658         int idx = d->prg_ind;
659
660         DBGMSG("Inserting packet for node " NODE_BUS_FMT
661                ", tlabel=%d, tcode=0x%x, speed=%d",
662                NODE_BUS_ARGS(ohci->host, packet->node_id), packet->tlabel,
663                packet->tcode, packet->speed_code);
664
665         d->prg_cpu[idx]->begin.address = 0;
666         d->prg_cpu[idx]->begin.branchAddress = 0;
667
668         if (d->type == DMA_CTX_ASYNC_RESP) {
669                 /*
670                  * For response packets, we need to put a timeout value in
671                  * the 16 lower bits of the status... let's try 1 sec timeout
672                  */
673                 cycleTimer = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
674                 d->prg_cpu[idx]->begin.status = cpu_to_le32(
675                         (((((cycleTimer>>25)&0x7)+1)&0x7)<<13) |
676                         ((cycleTimer&0x01fff000)>>12));
677
678                 DBGMSG("cycleTimer: %08x timeStamp: %08x",
679                        cycleTimer, d->prg_cpu[idx]->begin.status);
680         } else 
681                 d->prg_cpu[idx]->begin.status = 0;
682
683         if ( (packet->type == hpsb_async) || (packet->type == hpsb_raw) ) {
684
685                 if (packet->type == hpsb_raw) {
686                         d->prg_cpu[idx]->data[0] = cpu_to_le32(OHCI1394_TCODE_PHY<<4);
687                         d->prg_cpu[idx]->data[1] = cpu_to_le32(packet->header[0]);
688                         d->prg_cpu[idx]->data[2] = cpu_to_le32(packet->header[1]);
689                 } else {
690                         d->prg_cpu[idx]->data[0] = packet->speed_code<<16 |
691                                 (packet->header[0] & 0xFFFF);
692
693                         if (packet->tcode == TCODE_ISO_DATA) {
694                                 /* Sending an async stream packet */
695                                 d->prg_cpu[idx]->data[1] = packet->header[0] & 0xFFFF0000;
696                         } else {
697                                 /* Sending a normal async request or response */
698                                 d->prg_cpu[idx]->data[1] =
699                                         (packet->header[1] & 0xFFFF) |
700                                         (packet->header[0] & 0xFFFF0000);
701                                 d->prg_cpu[idx]->data[2] = packet->header[2];
702                                 d->prg_cpu[idx]->data[3] = packet->header[3];
703                         }
704                         packet_swab(d->prg_cpu[idx]->data, packet->tcode);
705                 }
706
707                 if (packet->data_size) { /* block transmit */
708                         if (packet->tcode == TCODE_STREAM_DATA){
709                                 d->prg_cpu[idx]->begin.control =
710                                         cpu_to_le32(DMA_CTL_OUTPUT_MORE |
711                                                     DMA_CTL_IMMEDIATE | 0x8);
712                         } else {
713                                 d->prg_cpu[idx]->begin.control =
714                                         cpu_to_le32(DMA_CTL_OUTPUT_MORE |
715                                                     DMA_CTL_IMMEDIATE | 0x10);
716                         }
717                         d->prg_cpu[idx]->end.control =
718                                 cpu_to_le32(DMA_CTL_OUTPUT_LAST |
719                                             DMA_CTL_IRQ |
720                                             DMA_CTL_BRANCH |
721                                             packet->data_size);
722                         /*
723                          * Check that the packet data buffer
724                          * does not cross a page boundary.
725                          *
726                          * XXX Fix this some day. eth1394 seems to trigger
727                          * it, but ignoring it doesn't seem to cause a
728                          * problem.
729                          */
730 #if 0
731                         if (cross_bound((unsigned long)packet->data,
732                                         packet->data_size)>0) {
733                                 /* FIXME: do something about it */
734                                 PRINT(KERN_ERR,
735                                       "%s: packet data addr: %p size %Zd bytes "
736                                       "cross page boundary", __FUNCTION__,
737                                       packet->data, packet->data_size);
738                         }
739 #endif
740                         d->prg_cpu[idx]->end.address = cpu_to_le32(
741                                 pci_map_single(ohci->dev, packet->data,
742                                                packet->data_size,
743                                                PCI_DMA_TODEVICE));
744                         OHCI_DMA_ALLOC("single, block transmit packet");
745
746                         d->prg_cpu[idx]->end.branchAddress = 0;
747                         d->prg_cpu[idx]->end.status = 0;
748                         if (d->branchAddrPtr)
749                                 *(d->branchAddrPtr) =
750                                         cpu_to_le32(d->prg_bus[idx] | 0x3);
751                         d->branchAddrPtr =
752                                 &(d->prg_cpu[idx]->end.branchAddress);
753                 } else { /* quadlet transmit */
754                         if (packet->type == hpsb_raw)
755                                 d->prg_cpu[idx]->begin.control =
756                                         cpu_to_le32(DMA_CTL_OUTPUT_LAST |
757                                                     DMA_CTL_IMMEDIATE |
758                                                     DMA_CTL_IRQ |
759                                                     DMA_CTL_BRANCH |
760                                                     (packet->header_size + 4));
761                         else
762                                 d->prg_cpu[idx]->begin.control =
763                                         cpu_to_le32(DMA_CTL_OUTPUT_LAST |
764                                                     DMA_CTL_IMMEDIATE |
765                                                     DMA_CTL_IRQ |
766                                                     DMA_CTL_BRANCH |
767                                                     packet->header_size);
768
769                         if (d->branchAddrPtr)
770                                 *(d->branchAddrPtr) =
771                                         cpu_to_le32(d->prg_bus[idx] | 0x2);
772                         d->branchAddrPtr =
773                                 &(d->prg_cpu[idx]->begin.branchAddress);
774                 }
775
776         } else { /* iso packet */
777                 d->prg_cpu[idx]->data[0] = packet->speed_code<<16 |
778                         (packet->header[0] & 0xFFFF);
779                 d->prg_cpu[idx]->data[1] = packet->header[0] & 0xFFFF0000;
780                 packet_swab(d->prg_cpu[idx]->data, packet->tcode);
781
782                 d->prg_cpu[idx]->begin.control =
783                         cpu_to_le32(DMA_CTL_OUTPUT_MORE |
784                                     DMA_CTL_IMMEDIATE | 0x8);
785                 d->prg_cpu[idx]->end.control =
786                         cpu_to_le32(DMA_CTL_OUTPUT_LAST |
787                                     DMA_CTL_UPDATE |
788                                     DMA_CTL_IRQ |
789                                     DMA_CTL_BRANCH |
790                                     packet->data_size);
791                 d->prg_cpu[idx]->end.address = cpu_to_le32(
792                                 pci_map_single(ohci->dev, packet->data,
793                                 packet->data_size, PCI_DMA_TODEVICE));
794                 OHCI_DMA_ALLOC("single, iso transmit packet");
795
796                 d->prg_cpu[idx]->end.branchAddress = 0;
797                 d->prg_cpu[idx]->end.status = 0;
798                 DBGMSG("Iso xmit context info: header[%08x %08x]\n"
799                        "                       begin=%08x %08x %08x %08x\n"
800                        "                             %08x %08x %08x %08x\n"
801                        "                       end  =%08x %08x %08x %08x",
802                        d->prg_cpu[idx]->data[0], d->prg_cpu[idx]->data[1],
803                        d->prg_cpu[idx]->begin.control,
804                        d->prg_cpu[idx]->begin.address,
805                        d->prg_cpu[idx]->begin.branchAddress,
806                        d->prg_cpu[idx]->begin.status,
807                        d->prg_cpu[idx]->data[0],
808                        d->prg_cpu[idx]->data[1],
809                        d->prg_cpu[idx]->data[2],
810                        d->prg_cpu[idx]->data[3],
811                        d->prg_cpu[idx]->end.control,
812                        d->prg_cpu[idx]->end.address,
813                        d->prg_cpu[idx]->end.branchAddress,
814                        d->prg_cpu[idx]->end.status);
815                 if (d->branchAddrPtr)
816                         *(d->branchAddrPtr) = cpu_to_le32(d->prg_bus[idx] | 0x3);
817                 d->branchAddrPtr = &(d->prg_cpu[idx]->end.branchAddress);
818         }
819         d->free_prgs--;
820
821         /* queue the packet in the appropriate context queue */
822         list_add_tail(&packet->driver_list, &d->fifo_list);
823         d->prg_ind = (d->prg_ind + 1) % d->num_desc;
824 }
825
826 /*
827  * This function fills the FIFO with the (eventual) pending packets
828  * and runs or wakes up the DMA prg if necessary.
829  *
830  * The function MUST be called with the d->lock held.
831  */
832 static void dma_trm_flush(struct ti_ohci *ohci, struct dma_trm_ctx *d)
833 {
834         struct hpsb_packet *packet, *ptmp;
835         int idx = d->prg_ind;
836         int z = 0;
837
838         /* insert the packets into the dma fifo */
839         list_for_each_entry_safe(packet, ptmp, &d->pending_list, driver_list) {
840                 if (!d->free_prgs)
841                         break;
842
843                 /* For the first packet only */
844                 if (!z)
845                         z = (packet->data_size) ? 3 : 2;
846
847                 /* Insert the packet */
848                 list_del_init(&packet->driver_list);
849                 insert_packet(ohci, d, packet);
850         }
851
852         /* Nothing must have been done, either no free_prgs or no packets */
853         if (z == 0)
854                 return;
855
856         /* Is the context running ? (should be unless it is
857            the first packet to be sent in this context) */
858         if (!(reg_read(ohci, d->ctrlSet) & 0x8000)) {
859                 u32 nodeId = reg_read(ohci, OHCI1394_NodeID);
860
861                 DBGMSG("Starting transmit DMA ctx=%d",d->ctx);
862                 reg_write(ohci, d->cmdPtr, d->prg_bus[idx] | z);
863
864                 /* Check that the node id is valid, and not 63 */
865                 if (!(nodeId & 0x80000000) || (nodeId & 0x3f) == 63)
866                         PRINT(KERN_ERR, "Running dma failed because Node ID is not valid");
867                 else
868                         reg_write(ohci, d->ctrlSet, 0x8000);
869         } else {
870                 /* Wake up the dma context if necessary */
871                 if (!(reg_read(ohci, d->ctrlSet) & 0x400))
872                         DBGMSG("Waking transmit DMA ctx=%d",d->ctx);
873
874                 /* do this always, to avoid race condition */
875                 reg_write(ohci, d->ctrlSet, 0x1000);
876         }
877
878         return;
879 }
880
881 /* Transmission of an async or iso packet */
882 static int ohci_transmit(struct hpsb_host *host, struct hpsb_packet *packet)
883 {
884         struct ti_ohci *ohci = host->hostdata;
885         struct dma_trm_ctx *d;
886         unsigned long flags;
887
888         if (packet->data_size > ohci->max_packet_size) {
889                 PRINT(KERN_ERR,
890                       "Transmit packet size %Zd is too big",
891                       packet->data_size);
892                 return -EOVERFLOW;
893         }
894
895         /* Decide whether we have an iso, a request, or a response packet */
896         if (packet->type == hpsb_raw)
897                 d = &ohci->at_req_context;
898         else if ((packet->tcode == TCODE_ISO_DATA) && (packet->type == hpsb_iso)) {
899                 /* The legacy IT DMA context is initialized on first
900                  * use.  However, the alloc cannot be run from
901                  * interrupt context, so we bail out if that is the
902                  * case. I don't see anyone sending ISO packets from
903                  * interrupt context anyway... */
904
905                 if (ohci->it_legacy_context.ohci == NULL) {
906                         if (in_interrupt()) {
907                                 PRINT(KERN_ERR,
908                                       "legacy IT context cannot be initialized during interrupt");
909                                 return -EINVAL;
910                         }
911
912                         if (alloc_dma_trm_ctx(ohci, &ohci->it_legacy_context,
913                                               DMA_CTX_ISO, 0, IT_NUM_DESC,
914                                               OHCI1394_IsoXmitContextBase) < 0) {
915                                 PRINT(KERN_ERR,
916                                       "error initializing legacy IT context");
917                                 return -ENOMEM;
918                         }
919
920                         initialize_dma_trm_ctx(&ohci->it_legacy_context);
921                 }
922
923                 d = &ohci->it_legacy_context;
924         } else if ((packet->tcode & 0x02) && (packet->tcode != TCODE_ISO_DATA))
925                 d = &ohci->at_resp_context;
926         else
927                 d = &ohci->at_req_context;
928
929         spin_lock_irqsave(&d->lock,flags);
930
931         list_add_tail(&packet->driver_list, &d->pending_list);
932
933         dma_trm_flush(ohci, d);
934
935         spin_unlock_irqrestore(&d->lock,flags);
936
937         return 0;
938 }
939
940 static int ohci_devctl(struct hpsb_host *host, enum devctl_cmd cmd, int arg)
941 {
942         struct ti_ohci *ohci = host->hostdata;
943         int retval = 0;
944         unsigned long flags;
945         int phy_reg;
946
947         switch (cmd) {
948         case RESET_BUS:
949                 switch (arg) {
950                 case SHORT_RESET:
951                         phy_reg = get_phy_reg(ohci, 5);
952                         phy_reg |= 0x40;
953                         set_phy_reg(ohci, 5, phy_reg); /* set ISBR */
954                         break;
955                 case LONG_RESET:
956                         phy_reg = get_phy_reg(ohci, 1);
957                         phy_reg |= 0x40;
958                         set_phy_reg(ohci, 1, phy_reg); /* set IBR */
959                         break;
960                 case SHORT_RESET_NO_FORCE_ROOT:
961                         phy_reg = get_phy_reg(ohci, 1);
962                         if (phy_reg & 0x80) {
963                                 phy_reg &= ~0x80;
964                                 set_phy_reg(ohci, 1, phy_reg); /* clear RHB */
965                         }
966
967                         phy_reg = get_phy_reg(ohci, 5);
968                         phy_reg |= 0x40;
969                         set_phy_reg(ohci, 5, phy_reg); /* set ISBR */
970                         break;
971                 case LONG_RESET_NO_FORCE_ROOT:
972                         phy_reg = get_phy_reg(ohci, 1);
973                         phy_reg &= ~0x80;
974                         phy_reg |= 0x40;
975                         set_phy_reg(ohci, 1, phy_reg); /* clear RHB, set IBR */
976                         break;
977                 case SHORT_RESET_FORCE_ROOT:
978                         phy_reg = get_phy_reg(ohci, 1);
979                         if (!(phy_reg & 0x80)) {
980                                 phy_reg |= 0x80;
981                                 set_phy_reg(ohci, 1, phy_reg); /* set RHB */
982                         }
983
984                         phy_reg = get_phy_reg(ohci, 5);
985                         phy_reg |= 0x40;
986                         set_phy_reg(ohci, 5, phy_reg); /* set ISBR */
987                         break;
988                 case LONG_RESET_FORCE_ROOT:
989                         phy_reg = get_phy_reg(ohci, 1);
990                         phy_reg |= 0xc0;
991                         set_phy_reg(ohci, 1, phy_reg); /* set RHB and IBR */
992                         break;
993                 default:
994                         retval = -1;
995                 }
996                 break;
997
998         case GET_CYCLE_COUNTER:
999                 retval = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
1000                 break;
1001
1002         case SET_CYCLE_COUNTER:
1003                 reg_write(ohci, OHCI1394_IsochronousCycleTimer, arg);
1004                 break;
1005
1006         case SET_BUS_ID:
1007                 PRINT(KERN_ERR, "devctl command SET_BUS_ID err");
1008                 break;
1009
1010         case ACT_CYCLE_MASTER:
1011                 if (arg) {
1012                         /* check if we are root and other nodes are present */
1013                         u32 nodeId = reg_read(ohci, OHCI1394_NodeID);
1014                         if ((nodeId & (1<<30)) && (nodeId & 0x3f)) {
1015                                 /*
1016                                  * enable cycleTimer, cycleMaster
1017                                  */
1018                                 DBGMSG("Cycle master enabled");
1019                                 reg_write(ohci, OHCI1394_LinkControlSet,
1020                                           OHCI1394_LinkControl_CycleTimerEnable |
1021                                           OHCI1394_LinkControl_CycleMaster);
1022                         }
1023                 } else {
1024                         /* disable cycleTimer, cycleMaster, cycleSource */
1025                         reg_write(ohci, OHCI1394_LinkControlClear,
1026                                   OHCI1394_LinkControl_CycleTimerEnable |
1027                                   OHCI1394_LinkControl_CycleMaster |
1028                                   OHCI1394_LinkControl_CycleSource);
1029                 }
1030                 break;
1031
1032         case CANCEL_REQUESTS:
1033                 DBGMSG("Cancel request received");
1034                 dma_trm_reset(&ohci->at_req_context);
1035                 dma_trm_reset(&ohci->at_resp_context);
1036                 break;
1037
1038         case ISO_LISTEN_CHANNEL:
1039         {
1040                 u64 mask;
1041                 struct dma_rcv_ctx *d = &ohci->ir_legacy_context;
1042                 int ir_legacy_active;
1043
1044                 if (arg<0 || arg>63) {
1045                         PRINT(KERN_ERR,
1046                               "%s: IS0 listen channel %d is out of range",
1047                               __FUNCTION__, arg);
1048                         return -EFAULT;
1049                 }
1050
1051                 mask = (u64)0x1<<arg;
1052
1053                 spin_lock_irqsave(&ohci->IR_channel_lock, flags);
1054
1055                 if (ohci->ISO_channel_usage & mask) {
1056                         PRINT(KERN_ERR,
1057                               "%s: IS0 listen channel %d is already used",
1058                               __FUNCTION__, arg);
1059                         spin_unlock_irqrestore(&ohci->IR_channel_lock, flags);
1060                         return -EFAULT;
1061                 }
1062
1063                 ir_legacy_active = ohci->ir_legacy_channels;
1064
1065                 ohci->ISO_channel_usage |= mask;
1066                 ohci->ir_legacy_channels |= mask;
1067
1068                 spin_unlock_irqrestore(&ohci->IR_channel_lock, flags);
1069
1070                 if (!ir_legacy_active) {
1071                         if (ohci1394_register_iso_tasklet(ohci,
1072                                           &ohci->ir_legacy_tasklet) < 0) {
1073                                 PRINT(KERN_ERR, "No IR DMA context available");
1074                                 return -EBUSY;
1075                         }
1076
1077                         /* the IR context can be assigned to any DMA context
1078                          * by ohci1394_register_iso_tasklet */
1079                         d->ctx = ohci->ir_legacy_tasklet.context;
1080                         d->ctrlSet = OHCI1394_IsoRcvContextControlSet +
1081                                 32*d->ctx;
1082                         d->ctrlClear = OHCI1394_IsoRcvContextControlClear +
1083                                 32*d->ctx;
1084                         d->cmdPtr = OHCI1394_IsoRcvCommandPtr + 32*d->ctx;
1085                         d->ctxtMatch = OHCI1394_IsoRcvContextMatch + 32*d->ctx;
1086
1087                         initialize_dma_rcv_ctx(&ohci->ir_legacy_context, 1);
1088
1089                         if (printk_ratelimit())
1090                                 DBGMSG("IR legacy activated");
1091                 }
1092
1093                 spin_lock_irqsave(&ohci->IR_channel_lock, flags);
1094
1095                 if (arg>31)
1096                         reg_write(ohci, OHCI1394_IRMultiChanMaskHiSet,
1097                                   1<<(arg-32));
1098                 else
1099                         reg_write(ohci, OHCI1394_IRMultiChanMaskLoSet,
1100                                   1<<arg);
1101
1102                 spin_unlock_irqrestore(&ohci->IR_channel_lock, flags);
1103                 DBGMSG("Listening enabled on channel %d", arg);
1104                 break;
1105         }
1106         case ISO_UNLISTEN_CHANNEL:
1107         {
1108                 u64 mask;
1109
1110                 if (arg<0 || arg>63) {
1111                         PRINT(KERN_ERR,
1112                               "%s: IS0 unlisten channel %d is out of range",
1113                               __FUNCTION__, arg);
1114                         return -EFAULT;
1115                 }
1116
1117                 mask = (u64)0x1<<arg;
1118
1119                 spin_lock_irqsave(&ohci->IR_channel_lock, flags);
1120
1121                 if (!(ohci->ISO_channel_usage & mask)) {
1122                         PRINT(KERN_ERR,
1123                               "%s: IS0 unlisten channel %d is not used",
1124                               __FUNCTION__, arg);
1125                         spin_unlock_irqrestore(&ohci->IR_channel_lock, flags);
1126                         return -EFAULT;
1127                 }
1128
1129                 ohci->ISO_channel_usage &= ~mask;
1130                 ohci->ir_legacy_channels &= ~mask;
1131
1132                 if (arg>31)
1133                         reg_write(ohci, OHCI1394_IRMultiChanMaskHiClear,
1134                                   1<<(arg-32));
1135                 else
1136                         reg_write(ohci, OHCI1394_IRMultiChanMaskLoClear,
1137                                   1<<arg);
1138
1139                 spin_unlock_irqrestore(&ohci->IR_channel_lock, flags);
1140                 DBGMSG("Listening disabled on channel %d", arg);
1141
1142                 if (ohci->ir_legacy_channels == 0) {
1143                         stop_dma_rcv_ctx(&ohci->ir_legacy_context);
1144                         DBGMSG("ISO legacy receive context stopped");
1145                 }
1146
1147                 break;
1148         }
1149         default:
1150                 PRINT_G(KERN_ERR, "ohci_devctl cmd %d not implemented yet",
1151                         cmd);
1152                 break;
1153         }
1154         return retval;
1155 }
1156
1157 /***********************************
1158  * rawiso ISO reception            *
1159  ***********************************/
1160
1161 /*
1162   We use either buffer-fill or packet-per-buffer DMA mode. The DMA
1163   buffer is split into "blocks" (regions described by one DMA
1164   descriptor). Each block must be one page or less in size, and
1165   must not cross a page boundary.
1166
1167   There is one little wrinkle with buffer-fill mode: a packet that
1168   starts in the final block may wrap around into the first block. But
1169   the user API expects all packets to be contiguous. Our solution is
1170   to keep the very last page of the DMA buffer in reserve - if a
1171   packet spans the gap, we copy its tail into this page.
1172 */
1173
1174 struct ohci_iso_recv {
1175         struct ti_ohci *ohci;
1176
1177         struct ohci1394_iso_tasklet task;
1178         int task_active;
1179
1180         enum { BUFFER_FILL_MODE = 0,
1181                PACKET_PER_BUFFER_MODE = 1 } dma_mode;
1182
1183         /* memory and PCI mapping for the DMA descriptors */
1184         struct dma_prog_region prog;
1185         struct dma_cmd *block; /* = (struct dma_cmd*) prog.virt */
1186
1187         /* how many DMA blocks fit in the buffer */
1188         unsigned int nblocks;
1189
1190         /* stride of DMA blocks */
1191         unsigned int buf_stride;
1192
1193         /* number of blocks to batch between interrupts */
1194         int block_irq_interval;
1195
1196         /* block that DMA will finish next */
1197         int block_dma;
1198
1199         /* (buffer-fill only) block that the reader will release next */
1200         int block_reader;
1201
1202         /* (buffer-fill only) bytes of buffer the reader has released,
1203            less than one block */
1204         int released_bytes;
1205
1206         /* (buffer-fill only) buffer offset at which the next packet will appear */
1207         int dma_offset;
1208
1209         /* OHCI DMA context control registers */
1210         u32 ContextControlSet;
1211         u32 ContextControlClear;
1212         u32 CommandPtr;
1213         u32 ContextMatch;
1214 };
1215
1216 static void ohci_iso_recv_task(unsigned long data);
1217 static void ohci_iso_recv_stop(struct hpsb_iso *iso);
1218 static void ohci_iso_recv_shutdown(struct hpsb_iso *iso);
1219 static int  ohci_iso_recv_start(struct hpsb_iso *iso, int cycle, int tag_mask, int sync);
1220 static void ohci_iso_recv_program(struct hpsb_iso *iso);
1221
1222 static int ohci_iso_recv_init(struct hpsb_iso *iso)
1223 {
1224         struct ti_ohci *ohci = iso->host->hostdata;
1225         struct ohci_iso_recv *recv;
1226         int ctx;
1227         int ret = -ENOMEM;
1228
1229         recv = kmalloc(sizeof(*recv), SLAB_KERNEL);
1230         if (!recv)
1231                 return -ENOMEM;
1232
1233         iso->hostdata = recv;
1234         recv->ohci = ohci;
1235         recv->task_active = 0;
1236         dma_prog_region_init(&recv->prog);
1237         recv->block = NULL;
1238
1239         /* use buffer-fill mode, unless irq_interval is 1
1240            (note: multichannel requires buffer-fill) */
1241
1242         if (((iso->irq_interval == 1 && iso->dma_mode == HPSB_ISO_DMA_OLD_ABI) ||
1243              iso->dma_mode == HPSB_ISO_DMA_PACKET_PER_BUFFER) && iso->channel != -1) {
1244                 recv->dma_mode = PACKET_PER_BUFFER_MODE;
1245         } else {
1246                 recv->dma_mode = BUFFER_FILL_MODE;
1247         }
1248
1249         /* set nblocks, buf_stride, block_irq_interval */
1250
1251         if (recv->dma_mode == BUFFER_FILL_MODE) {
1252                 recv->buf_stride = PAGE_SIZE;
1253
1254                 /* one block per page of data in the DMA buffer, minus the final guard page */
1255                 recv->nblocks = iso->buf_size/PAGE_SIZE - 1;
1256                 if (recv->nblocks < 3) {
1257                         DBGMSG("ohci_iso_recv_init: DMA buffer too small");
1258                         goto err;
1259                 }
1260
1261                 /* iso->irq_interval is in packets - translate that to blocks */
1262                 if (iso->irq_interval == 1)
1263                         recv->block_irq_interval = 1;
1264                 else
1265                         recv->block_irq_interval = iso->irq_interval *
1266                                                         ((recv->nblocks+1)/iso->buf_packets);
1267                 if (recv->block_irq_interval*4 > recv->nblocks)
1268                         recv->block_irq_interval = recv->nblocks/4;
1269                 if (recv->block_irq_interval < 1)
1270                         recv->block_irq_interval = 1;
1271
1272         } else {
1273                 int max_packet_size;
1274
1275                 recv->nblocks = iso->buf_packets;
1276                 recv->block_irq_interval = iso->irq_interval;
1277                 if (recv->block_irq_interval * 4 > iso->buf_packets)
1278                         recv->block_irq_interval = iso->buf_packets / 4;
1279                 if (recv->block_irq_interval < 1)
1280                 recv->block_irq_interval = 1;
1281
1282                 /* choose a buffer stride */
1283                 /* must be a power of 2, and <= PAGE_SIZE */
1284
1285                 max_packet_size = iso->buf_size / iso->buf_packets;
1286
1287                 for (recv->buf_stride = 8; recv->buf_stride < max_packet_size;
1288                     recv->buf_stride *= 2);
1289
1290                 if (recv->buf_stride*iso->buf_packets > iso->buf_size ||
1291                    recv->buf_stride > PAGE_SIZE) {
1292                         /* this shouldn't happen, but anyway... */
1293                         DBGMSG("ohci_iso_recv_init: problem choosing a buffer stride");
1294                         goto err;
1295                 }
1296         }
1297
1298         recv->block_reader = 0;
1299         recv->released_bytes = 0;
1300         recv->block_dma = 0;
1301         recv->dma_offset = 0;
1302
1303         /* size of DMA program = one descriptor per block */
1304         if (dma_prog_region_alloc(&recv->prog,
1305                                  sizeof(struct dma_cmd) * recv->nblocks,
1306                                  recv->ohci->dev))
1307                 goto err;
1308
1309         recv->block = (struct dma_cmd*) recv->prog.kvirt;
1310
1311         ohci1394_init_iso_tasklet(&recv->task,
1312                                   iso->channel == -1 ? OHCI_ISO_MULTICHANNEL_RECEIVE :
1313                                                        OHCI_ISO_RECEIVE,
1314                                   ohci_iso_recv_task, (unsigned long) iso);
1315
1316         if (ohci1394_register_iso_tasklet(recv->ohci, &recv->task) < 0) {
1317                 ret = -EBUSY;
1318                 goto err;
1319         }
1320
1321         recv->task_active = 1;
1322
1323         /* recv context registers are spaced 32 bytes apart */
1324         ctx = recv->task.context;
1325         recv->ContextControlSet = OHCI1394_IsoRcvContextControlSet + 32 * ctx;
1326         recv->ContextControlClear = OHCI1394_IsoRcvContextControlClear + 32 * ctx;
1327         recv->CommandPtr = OHCI1394_IsoRcvCommandPtr + 32 * ctx;
1328         recv->ContextMatch = OHCI1394_IsoRcvContextMatch + 32 * ctx;
1329
1330         if (iso->channel == -1) {
1331                 /* clear multi-channel selection mask */
1332                 reg_write(recv->ohci, OHCI1394_IRMultiChanMaskHiClear, 0xFFFFFFFF);
1333                 reg_write(recv->ohci, OHCI1394_IRMultiChanMaskLoClear, 0xFFFFFFFF);
1334         }
1335
1336         /* write the DMA program */
1337         ohci_iso_recv_program(iso);
1338
1339         DBGMSG("ohci_iso_recv_init: %s mode, DMA buffer is %lu pages"
1340                " (%u bytes), using %u blocks, buf_stride %u, block_irq_interval %d",
1341                recv->dma_mode == BUFFER_FILL_MODE ?
1342                "buffer-fill" : "packet-per-buffer",
1343                iso->buf_size/PAGE_SIZE, iso->buf_size,
1344                recv->nblocks, recv->buf_stride, recv->block_irq_interval);
1345
1346         return 0;
1347
1348 err:
1349         ohci_iso_recv_shutdown(iso);
1350         return ret;
1351 }
1352
1353 static void ohci_iso_recv_stop(struct hpsb_iso *iso)
1354 {
1355         struct ohci_iso_recv *recv = iso->hostdata;
1356
1357         /* disable interrupts */
1358         reg_write(recv->ohci, OHCI1394_IsoRecvIntMaskClear, 1 << recv->task.context);
1359
1360         /* halt DMA */
1361         ohci1394_stop_context(recv->ohci, recv->ContextControlClear, NULL);
1362 }
1363
1364 static void ohci_iso_recv_shutdown(struct hpsb_iso *iso)
1365 {
1366         struct ohci_iso_recv *recv = iso->hostdata;
1367
1368         if (recv->task_active) {
1369                 ohci_iso_recv_stop(iso);
1370                 ohci1394_unregister_iso_tasklet(recv->ohci, &recv->task);
1371                 recv->task_active = 0;
1372         }
1373
1374         dma_prog_region_free(&recv->prog);
1375         kfree(recv);
1376         iso->hostdata = NULL;
1377 }
1378
1379 /* set up a "gapped" ring buffer DMA program */
1380 static void ohci_iso_recv_program(struct hpsb_iso *iso)
1381 {
1382         struct ohci_iso_recv *recv = iso->hostdata;
1383         int blk;
1384
1385         /* address of 'branch' field in previous DMA descriptor */
1386         u32 *prev_branch = NULL;
1387
1388         for (blk = 0; blk < recv->nblocks; blk++) {
1389                 u32 control;
1390
1391                 /* the DMA descriptor */
1392                 struct dma_cmd *cmd = &recv->block[blk];
1393
1394                 /* offset of the DMA descriptor relative to the DMA prog buffer */
1395                 unsigned long prog_offset = blk * sizeof(struct dma_cmd);
1396
1397                 /* offset of this packet's data within the DMA buffer */
1398                 unsigned long buf_offset = blk * recv->buf_stride;
1399
1400                 if (recv->dma_mode == BUFFER_FILL_MODE) {
1401                         control = 2 << 28; /* INPUT_MORE */
1402                 } else {
1403                         control = 3 << 28; /* INPUT_LAST */
1404                 }
1405
1406                 control |= 8 << 24; /* s = 1, update xferStatus and resCount */
1407
1408                 /* interrupt on last block, and at intervals */
1409                 if (blk == recv->nblocks-1 || (blk % recv->block_irq_interval) == 0) {
1410                         control |= 3 << 20; /* want interrupt */
1411                 }
1412
1413                 control |= 3 << 18; /* enable branch to address */
1414                 control |= recv->buf_stride;
1415
1416                 cmd->control = cpu_to_le32(control);
1417                 cmd->address = cpu_to_le32(dma_region_offset_to_bus(&iso->data_buf, buf_offset));
1418                 cmd->branchAddress = 0; /* filled in on next loop */
1419                 cmd->status = cpu_to_le32(recv->buf_stride);
1420
1421                 /* link the previous descriptor to this one */
1422                 if (prev_branch) {
1423                         *prev_branch = cpu_to_le32(dma_prog_region_offset_to_bus(&recv->prog, prog_offset) | 1);
1424                 }
1425
1426                 prev_branch = &cmd->branchAddress;
1427         }
1428
1429         /* the final descriptor's branch address and Z should be left at 0 */
1430 }
1431
1432 /* listen or unlisten to a specific channel (multi-channel mode only) */
1433 static void ohci_iso_recv_change_channel(struct hpsb_iso *iso, unsigned char channel, int listen)
1434 {
1435         struct ohci_iso_recv *recv = iso->hostdata;
1436         int reg, i;
1437
1438         if (channel < 32) {
1439                 reg = listen ? OHCI1394_IRMultiChanMaskLoSet : OHCI1394_IRMultiChanMaskLoClear;
1440                 i = channel;
1441         } else {
1442                 reg = listen ? OHCI1394_IRMultiChanMaskHiSet : OHCI1394_IRMultiChanMaskHiClear;
1443                 i = channel - 32;
1444         }
1445
1446         reg_write(recv->ohci, reg, (1 << i));
1447
1448         /* issue a dummy read to force all PCI writes to be posted immediately */
1449         mb();
1450         reg_read(recv->ohci, OHCI1394_IsochronousCycleTimer);
1451 }
1452
1453 static void ohci_iso_recv_set_channel_mask(struct hpsb_iso *iso, u64 mask)
1454 {
1455         struct ohci_iso_recv *recv = iso->hostdata;
1456         int i;
1457
1458         for (i = 0; i < 64; i++) {
1459                 if (mask & (1ULL << i)) {
1460                         if (i < 32)
1461                                 reg_write(recv->ohci, OHCI1394_IRMultiChanMaskLoSet, (1 << i));
1462                         else
1463                                 reg_write(recv->ohci, OHCI1394_IRMultiChanMaskHiSet, (1 << (i-32)));
1464                 } else {
1465                         if (i < 32)
1466                                 reg_write(recv->ohci, OHCI1394_IRMultiChanMaskLoClear, (1 << i));
1467                         else
1468                                 reg_write(recv->ohci, OHCI1394_IRMultiChanMaskHiClear, (1 << (i-32)));
1469                 }
1470         }
1471
1472         /* issue a dummy read to force all PCI writes to be posted immediately */
1473         mb();
1474         reg_read(recv->ohci, OHCI1394_IsochronousCycleTimer);
1475 }
1476
1477 static int ohci_iso_recv_start(struct hpsb_iso *iso, int cycle, int tag_mask, int sync)
1478 {
1479         struct ohci_iso_recv *recv = iso->hostdata;
1480         struct ti_ohci *ohci = recv->ohci;
1481         u32 command, contextMatch;
1482
1483         reg_write(recv->ohci, recv->ContextControlClear, 0xFFFFFFFF);
1484         wmb();
1485
1486         /* always keep ISO headers */
1487         command = (1 << 30);
1488
1489         if (recv->dma_mode == BUFFER_FILL_MODE)
1490                 command |= (1 << 31);
1491
1492         reg_write(recv->ohci, recv->ContextControlSet, command);
1493
1494         /* match on specified tags */
1495         contextMatch = tag_mask << 28;
1496
1497         if (iso->channel == -1) {
1498                 /* enable multichannel reception */
1499                 reg_write(recv->ohci, recv->ContextControlSet, (1 << 28));
1500         } else {
1501                 /* listen on channel */
1502                 contextMatch |= iso->channel;
1503         }
1504
1505         if (cycle != -1) {
1506                 u32 seconds;
1507
1508                 /* enable cycleMatch */
1509                 reg_write(recv->ohci, recv->ContextControlSet, (1 << 29));
1510
1511                 /* set starting cycle */
1512                 cycle &= 0x1FFF;
1513
1514                 /* 'cycle' is only mod 8000, but we also need two 'seconds' bits -
1515                    just snarf them from the current time */
1516                 seconds = reg_read(recv->ohci, OHCI1394_IsochronousCycleTimer) >> 25;
1517
1518                 /* advance one second to give some extra time for DMA to start */
1519                 seconds += 1;
1520
1521                 cycle |= (seconds & 3) << 13;
1522
1523                 contextMatch |= cycle << 12;
1524         }
1525
1526         if (sync != -1) {
1527                 /* set sync flag on first DMA descriptor */
1528                 struct dma_cmd *cmd = &recv->block[recv->block_dma];
1529                 cmd->control |= cpu_to_le32(DMA_CTL_WAIT);
1530
1531                 /* match sync field */
1532                 contextMatch |= (sync&0xf)<<8;
1533         }
1534
1535         reg_write(recv->ohci, recv->ContextMatch, contextMatch);
1536
1537         /* address of first descriptor block */
1538         command = dma_prog_region_offset_to_bus(&recv->prog,
1539                                                 recv->block_dma * sizeof(struct dma_cmd));
1540         command |= 1; /* Z=1 */
1541
1542         reg_write(recv->ohci, recv->CommandPtr, command);
1543
1544         /* enable interrupts */
1545         reg_write(recv->ohci, OHCI1394_IsoRecvIntMaskSet, 1 << recv->task.context);
1546
1547         wmb();
1548
1549         /* run */
1550         reg_write(recv->ohci, recv->ContextControlSet, 0x8000);
1551
1552         /* issue a dummy read of the cycle timer register to force
1553            all PCI writes to be posted immediately */
1554         mb();
1555         reg_read(recv->ohci, OHCI1394_IsochronousCycleTimer);
1556
1557         /* check RUN */
1558         if (!(reg_read(recv->ohci, recv->ContextControlSet) & 0x8000)) {
1559                 PRINT(KERN_ERR,
1560                       "Error starting IR DMA (ContextControl 0x%08x)\n",
1561                       reg_read(recv->ohci, recv->ContextControlSet));
1562                 return -1;
1563         }
1564
1565         return 0;
1566 }
1567
1568 static void ohci_iso_recv_release_block(struct ohci_iso_recv *recv, int block)
1569 {
1570         /* re-use the DMA descriptor for the block */
1571         /* by linking the previous descriptor to it */
1572
1573         int next_i = block;
1574         int prev_i = (next_i == 0) ? (recv->nblocks - 1) : (next_i - 1);
1575
1576         struct dma_cmd *next = &recv->block[next_i];
1577         struct dma_cmd *prev = &recv->block[prev_i];
1578         
1579         /* ignore out-of-range requests */
1580         if ((block < 0) || (block > recv->nblocks))
1581                 return;
1582
1583         /* 'next' becomes the new end of the DMA chain,
1584            so disable branch and enable interrupt */
1585         next->branchAddress = 0;
1586         next->control |= cpu_to_le32(3 << 20);
1587         next->status = cpu_to_le32(recv->buf_stride);
1588
1589         /* link prev to next */
1590         prev->branchAddress = cpu_to_le32(dma_prog_region_offset_to_bus(&recv->prog,
1591                                                                         sizeof(struct dma_cmd) * next_i)
1592                                           | 1); /* Z=1 */
1593
1594         /* disable interrupt on previous DMA descriptor, except at intervals */
1595         if ((prev_i % recv->block_irq_interval) == 0) {
1596                 prev->control |= cpu_to_le32(3 << 20); /* enable interrupt */
1597         } else {
1598                 prev->control &= cpu_to_le32(~(3<<20)); /* disable interrupt */
1599         }
1600         wmb();
1601
1602         /* wake up DMA in case it fell asleep */
1603         reg_write(recv->ohci, recv->ContextControlSet, (1 << 12));
1604 }
1605
1606 static void ohci_iso_recv_bufferfill_release(struct ohci_iso_recv *recv,
1607                                              struct hpsb_iso_packet_info *info)
1608 {
1609         /* release the memory where the packet was */
1610         recv->released_bytes += info->total_len;
1611
1612         /* have we released enough memory for one block? */
1613         while (recv->released_bytes > recv->buf_stride) {
1614                 ohci_iso_recv_release_block(recv, recv->block_reader);
1615                 recv->block_reader = (recv->block_reader + 1) % recv->nblocks;
1616                 recv->released_bytes -= recv->buf_stride;
1617         }
1618 }
1619
1620 static inline void ohci_iso_recv_release(struct hpsb_iso *iso, struct hpsb_iso_packet_info *info)
1621 {
1622         struct ohci_iso_recv *recv = iso->hostdata;
1623         if (recv->dma_mode == BUFFER_FILL_MODE) {
1624                 ohci_iso_recv_bufferfill_release(recv, info);
1625         } else {
1626                 ohci_iso_recv_release_block(recv, info - iso->infos);
1627         }
1628 }
1629
1630 /* parse all packets from blocks that have been fully received */
1631 static void ohci_iso_recv_bufferfill_parse(struct hpsb_iso *iso, struct ohci_iso_recv *recv)
1632 {
1633         int wake = 0;
1634         int runaway = 0;
1635         struct ti_ohci *ohci = recv->ohci;
1636
1637         while (1) {
1638                 /* we expect the next parsable packet to begin at recv->dma_offset */
1639                 /* note: packet layout is as shown in section 10.6.1.1 of the OHCI spec */
1640
1641                 unsigned int offset;
1642                 unsigned short len, cycle, total_len;
1643                 unsigned char channel, tag, sy;
1644
1645                 unsigned char *p = iso->data_buf.kvirt;
1646
1647                 unsigned int this_block = recv->dma_offset/recv->buf_stride;
1648
1649                 /* don't loop indefinitely */
1650                 if (runaway++ > 100000) {
1651                         atomic_inc(&iso->overflows);
1652                         PRINT(KERN_ERR,
1653                               "IR DMA error - Runaway during buffer parsing!\n");
1654                         break;
1655                 }
1656
1657                 /* stop parsing once we arrive at block_dma (i.e. don't get ahead of DMA) */
1658                 if (this_block == recv->block_dma)
1659                         break;
1660
1661                 wake = 1;
1662
1663                 /* parse data length, tag, channel, and sy */
1664
1665                 /* note: we keep our own local copies of 'len' and 'offset'
1666                    so the user can't mess with them by poking in the mmap area */
1667
1668                 len = p[recv->dma_offset+2] | (p[recv->dma_offset+3] << 8);
1669
1670                 if (len > 4096) {
1671                         PRINT(KERN_ERR,
1672                               "IR DMA error - bogus 'len' value %u\n", len);
1673                 }
1674
1675                 channel = p[recv->dma_offset+1] & 0x3F;
1676                 tag = p[recv->dma_offset+1] >> 6;
1677                 sy = p[recv->dma_offset+0] & 0xF;
1678
1679                 /* advance to data payload */
1680                 recv->dma_offset += 4;
1681
1682                 /* check for wrap-around */
1683                 if (recv->dma_offset >= recv->buf_stride*recv->nblocks) {
1684                         recv->dma_offset -= recv->buf_stride*recv->nblocks;
1685                 }
1686
1687                 /* dma_offset now points to the first byte of the data payload */
1688                 offset = recv->dma_offset;
1689
1690                 /* advance to xferStatus/timeStamp */
1691                 recv->dma_offset += len;
1692
1693                 total_len = len + 8; /* 8 bytes header+trailer in OHCI packet */
1694                 /* payload is padded to 4 bytes */
1695                 if (len % 4) {
1696                         recv->dma_offset += 4 - (len%4);
1697                         total_len += 4 - (len%4);
1698                 }
1699
1700                 /* check for wrap-around */
1701                 if (recv->dma_offset >= recv->buf_stride*recv->nblocks) {
1702                         /* uh oh, the packet data wraps from the last
1703                            to the first DMA block - make the packet
1704                            contiguous by copying its "tail" into the
1705                            guard page */
1706
1707                         int guard_off = recv->buf_stride*recv->nblocks;
1708                         int tail_len = len - (guard_off - offset);
1709
1710                         if (tail_len > 0  && tail_len < recv->buf_stride) {
1711                                 memcpy(iso->data_buf.kvirt + guard_off,
1712                                        iso->data_buf.kvirt,
1713                                        tail_len);
1714                         }
1715
1716                         recv->dma_offset -= recv->buf_stride*recv->nblocks;
1717                 }
1718
1719                 /* parse timestamp */
1720                 cycle = p[recv->dma_offset+0] | (p[recv->dma_offset+1]<<8);
1721                 cycle &= 0x1FFF;
1722
1723                 /* advance to next packet */
1724                 recv->dma_offset += 4;
1725
1726                 /* check for wrap-around */
1727                 if (recv->dma_offset >= recv->buf_stride*recv->nblocks) {
1728                         recv->dma_offset -= recv->buf_stride*recv->nblocks;
1729                 }
1730
1731                 hpsb_iso_packet_received(iso, offset, len, total_len, cycle, channel, tag, sy);
1732         }
1733
1734         if (wake)
1735                 hpsb_iso_wake(iso);
1736 }
1737
1738 static void ohci_iso_recv_bufferfill_task(struct hpsb_iso *iso, struct ohci_iso_recv *recv)
1739 {
1740         int loop;
1741         struct ti_ohci *ohci = recv->ohci;
1742
1743         /* loop over all blocks */
1744         for (loop = 0; loop < recv->nblocks; loop++) {
1745
1746                 /* check block_dma to see if it's done */
1747                 struct dma_cmd *im = &recv->block[recv->block_dma];
1748
1749                 /* check the DMA descriptor for new writes to xferStatus */
1750                 u16 xferstatus = le32_to_cpu(im->status) >> 16;
1751
1752                 /* rescount is the number of bytes *remaining to be written* in the block */
1753                 u16 rescount = le32_to_cpu(im->status) & 0xFFFF;
1754
1755                 unsigned char event = xferstatus & 0x1F;
1756
1757                 if (!event) {
1758                         /* nothing has happened to this block yet */
1759                         break;
1760                 }
1761
1762                 if (event != 0x11) {
1763                         atomic_inc(&iso->overflows);
1764                         PRINT(KERN_ERR,
1765                               "IR DMA error - OHCI error code 0x%02x\n", event);
1766                 }
1767
1768                 if (rescount != 0) {
1769                         /* the card is still writing to this block;
1770                            we can't touch it until it's done */
1771                         break;
1772                 }
1773
1774                 /* OK, the block is finished... */
1775
1776                 /* sync our view of the block */
1777                 dma_region_sync_for_cpu(&iso->data_buf, recv->block_dma*recv->buf_stride, recv->buf_stride);
1778
1779                 /* reset the DMA descriptor */
1780                 im->status = recv->buf_stride;
1781
1782                 /* advance block_dma */
1783                 recv->block_dma = (recv->block_dma + 1) % recv->nblocks;
1784
1785                 if ((recv->block_dma+1) % recv->nblocks == recv->block_reader) {
1786                         atomic_inc(&iso->overflows);
1787                         DBGMSG("ISO reception overflow - "
1788                                "ran out of DMA blocks");
1789                 }
1790         }
1791
1792         /* parse any packets that have arrived */
1793         ohci_iso_recv_bufferfill_parse(iso, recv);
1794 }
1795
1796 static void ohci_iso_recv_packetperbuf_task(struct hpsb_iso *iso, struct ohci_iso_recv *recv)
1797 {
1798         int count;
1799         int wake = 0;
1800         struct ti_ohci *ohci = recv->ohci;
1801
1802         /* loop over the entire buffer */
1803         for (count = 0; count < recv->nblocks; count++) {
1804                 u32 packet_len = 0;
1805
1806                 /* pointer to the DMA descriptor */
1807                 struct dma_cmd *il = ((struct dma_cmd*) recv->prog.kvirt) + iso->pkt_dma;
1808
1809                 /* check the DMA descriptor for new writes to xferStatus */
1810                 u16 xferstatus = le32_to_cpu(il->status) >> 16;
1811                 u16 rescount = le32_to_cpu(il->status) & 0xFFFF;
1812
1813                 unsigned char event = xferstatus & 0x1F;
1814
1815                 if (!event) {
1816                         /* this packet hasn't come in yet; we are done for now */
1817                         goto out;
1818                 }
1819
1820                 if (event == 0x11) {
1821                         /* packet received successfully! */
1822
1823                         /* rescount is the number of bytes *remaining* in the packet buffer,
1824                            after the packet was written */
1825                         packet_len = recv->buf_stride - rescount;
1826
1827                 } else if (event == 0x02) {
1828                         PRINT(KERN_ERR, "IR DMA error - packet too long for buffer\n");
1829                 } else if (event) {
1830                         PRINT(KERN_ERR, "IR DMA error - OHCI error code 0x%02x\n", event);
1831                 }
1832
1833                 /* sync our view of the buffer */
1834                 dma_region_sync_for_cpu(&iso->data_buf, iso->pkt_dma * recv->buf_stride, recv->buf_stride);
1835
1836                 /* record the per-packet info */
1837                 {
1838                         /* iso header is 8 bytes ahead of the data payload */
1839                         unsigned char *hdr;
1840
1841                         unsigned int offset;
1842                         unsigned short cycle;
1843                         unsigned char channel, tag, sy;
1844
1845                         offset = iso->pkt_dma * recv->buf_stride;
1846                         hdr = iso->data_buf.kvirt + offset;
1847
1848                         /* skip iso header */
1849                         offset += 8;
1850                         packet_len -= 8;
1851
1852                         cycle = (hdr[0] | (hdr[1] << 8)) & 0x1FFF;
1853                         channel = hdr[5] & 0x3F;
1854                         tag = hdr[5] >> 6;
1855                         sy = hdr[4] & 0xF;
1856
1857                         hpsb_iso_packet_received(iso, offset, packet_len,
1858                                         recv->buf_stride, cycle, channel, tag, sy);
1859                 }
1860
1861                 /* reset the DMA descriptor */
1862                 il->status = recv->buf_stride;
1863
1864                 wake = 1;
1865                 recv->block_dma = iso->pkt_dma;
1866         }
1867
1868 out:
1869         if (wake)
1870                 hpsb_iso_wake(iso);
1871 }
1872
1873 static void ohci_iso_recv_task(unsigned long data)
1874 {
1875         struct hpsb_iso *iso = (struct hpsb_iso*) data;
1876         struct ohci_iso_recv *recv = iso->hostdata;
1877
1878         if (recv->dma_mode == BUFFER_FILL_MODE)
1879                 ohci_iso_recv_bufferfill_task(iso, recv);
1880         else
1881                 ohci_iso_recv_packetperbuf_task(iso, recv);
1882 }
1883
1884 /***********************************
1885  * rawiso ISO transmission         *
1886  ***********************************/
1887
1888 struct ohci_iso_xmit {
1889         struct ti_ohci *ohci;
1890         struct dma_prog_region prog;
1891         struct ohci1394_iso_tasklet task;
1892         int task_active;
1893
1894         u32 ContextControlSet;
1895         u32 ContextControlClear;
1896         u32 CommandPtr;
1897 };
1898
1899 /* transmission DMA program:
1900    one OUTPUT_MORE_IMMEDIATE for the IT header
1901    one OUTPUT_LAST for the buffer data */
1902
1903 struct iso_xmit_cmd {
1904         struct dma_cmd output_more_immediate;
1905         u8 iso_hdr[8];
1906         u32 unused[2];
1907         struct dma_cmd output_last;
1908 };
1909
1910 static int ohci_iso_xmit_init(struct hpsb_iso *iso);
1911 static int ohci_iso_xmit_start(struct hpsb_iso *iso, int cycle);
1912 static void ohci_iso_xmit_shutdown(struct hpsb_iso *iso);
1913 static void ohci_iso_xmit_task(unsigned long data);
1914
1915 static int ohci_iso_xmit_init(struct hpsb_iso *iso)
1916 {
1917         struct ohci_iso_xmit *xmit;
1918         unsigned int prog_size;
1919         int ctx;
1920         int ret = -ENOMEM;
1921
1922         xmit = kmalloc(sizeof(*xmit), SLAB_KERNEL);
1923         if (!xmit)
1924                 return -ENOMEM;
1925
1926         iso->hostdata = xmit;
1927         xmit->ohci = iso->host->hostdata;
1928         xmit->task_active = 0;
1929
1930         dma_prog_region_init(&xmit->prog);
1931
1932         prog_size = sizeof(struct iso_xmit_cmd) * iso->buf_packets;
1933
1934         if (dma_prog_region_alloc(&xmit->prog, prog_size, xmit->ohci->dev))
1935                 goto err;
1936
1937         ohci1394_init_iso_tasklet(&xmit->task, OHCI_ISO_TRANSMIT,
1938                                   ohci_iso_xmit_task, (unsigned long) iso);
1939
1940         if (ohci1394_register_iso_tasklet(xmit->ohci, &xmit->task) < 0) {
1941                 ret = -EBUSY;
1942                 goto err;
1943         }
1944
1945         xmit->task_active = 1;
1946
1947         /* xmit context registers are spaced 16 bytes apart */
1948         ctx = xmit->task.context;
1949         xmit->ContextControlSet = OHCI1394_IsoXmitContextControlSet + 16 * ctx;
1950         xmit->ContextControlClear = OHCI1394_IsoXmitContextControlClear + 16 * ctx;
1951         xmit->CommandPtr = OHCI1394_IsoXmitCommandPtr + 16 * ctx;
1952
1953         return 0;
1954
1955 err:
1956         ohci_iso_xmit_shutdown(iso);
1957         return ret;
1958 }
1959
1960 static void ohci_iso_xmit_stop(struct hpsb_iso *iso)
1961 {
1962         struct ohci_iso_xmit *xmit = iso->hostdata;
1963         struct ti_ohci *ohci = xmit->ohci;
1964
1965         /* disable interrupts */
1966         reg_write(xmit->ohci, OHCI1394_IsoXmitIntMaskClear, 1 << xmit->task.context);
1967
1968         /* halt DMA */
1969         if (ohci1394_stop_context(xmit->ohci, xmit->ContextControlClear, NULL)) {
1970                 /* XXX the DMA context will lock up if you try to send too much data! */
1971                 PRINT(KERN_ERR,
1972                       "you probably exceeded the OHCI card's bandwidth limit - "
1973                       "reload the module and reduce xmit bandwidth");
1974         }
1975 }
1976
1977 static void ohci_iso_xmit_shutdown(struct hpsb_iso *iso)
1978 {
1979         struct ohci_iso_xmit *xmit = iso->hostdata;
1980
1981         if (xmit->task_active) {
1982                 ohci_iso_xmit_stop(iso);
1983                 ohci1394_unregister_iso_tasklet(xmit->ohci, &xmit->task);
1984                 xmit->task_active = 0;
1985         }
1986
1987         dma_prog_region_free(&xmit->prog);
1988         kfree(xmit);
1989         iso->hostdata = NULL;
1990 }
1991
1992 static void ohci_iso_xmit_task(unsigned long data)
1993 {
1994         struct hpsb_iso *iso = (struct hpsb_iso*) data;
1995         struct ohci_iso_xmit *xmit = iso->hostdata;
1996         struct ti_ohci *ohci = xmit->ohci;
1997         int wake = 0;
1998         int count;
1999
2000         /* check the whole buffer if necessary, starting at pkt_dma */
2001         for (count = 0; count < iso->buf_packets; count++) {
2002                 int cycle;
2003
2004                 /* DMA descriptor */
2005                 struct iso_xmit_cmd *cmd = dma_region_i(&xmit->prog, struct iso_xmit_cmd, iso->pkt_dma);
2006
2007                 /* check for new writes to xferStatus */
2008                 u16 xferstatus = le32_to_cpu(cmd->output_last.status) >> 16;
2009                 u8  event = xferstatus & 0x1F;
2010
2011                 if (!event) {
2012                         /* packet hasn't been sent yet; we are done for now */
2013                         break;
2014                 }
2015
2016                 if (event != 0x11)
2017                         PRINT(KERN_ERR,
2018                               "IT DMA error - OHCI error code 0x%02x\n", event);
2019
2020                 /* at least one packet went out, so wake up the writer */
2021                 wake = 1;
2022
2023                 /* parse cycle */
2024                 cycle = le32_to_cpu(cmd->output_last.status) & 0x1FFF;
2025
2026                 /* tell the subsystem the packet has gone out */
2027                 hpsb_iso_packet_sent(iso, cycle, event != 0x11);
2028
2029                 /* reset the DMA descriptor for next time */
2030                 cmd->output_last.status = 0;
2031         }
2032
2033         if (wake)
2034                 hpsb_iso_wake(iso);
2035 }
2036
2037 static int ohci_iso_xmit_queue(struct hpsb_iso *iso, struct hpsb_iso_packet_info *info)
2038 {
2039         struct ohci_iso_xmit *xmit = iso->hostdata;
2040         struct ti_ohci *ohci = xmit->ohci;
2041
2042         int next_i, prev_i;
2043         struct iso_xmit_cmd *next, *prev;
2044
2045         unsigned int offset;
2046         unsigned short len;
2047         unsigned char tag, sy;
2048
2049         /* check that the packet doesn't cross a page boundary
2050            (we could allow this if we added OUTPUT_MORE descriptor support) */
2051         if (cross_bound(info->offset, info->len)) {
2052                 PRINT(KERN_ERR,
2053                       "rawiso xmit: packet %u crosses a page boundary",
2054                       iso->first_packet);
2055                 return -EINVAL;
2056         }
2057
2058         offset = info->offset;
2059         len = info->len;
2060         tag = info->tag;
2061         sy = info->sy;
2062
2063         /* sync up the card's view of the buffer */
2064         dma_region_sync_for_device(&iso->data_buf, offset, len);
2065
2066         /* append first_packet to the DMA chain */
2067         /* by linking the previous descriptor to it */
2068         /* (next will become the new end of the DMA chain) */
2069
2070         next_i = iso->first_packet;
2071         prev_i = (next_i == 0) ? (iso->buf_packets - 1) : (next_i - 1);
2072
2073         next = dma_region_i(&xmit->prog, struct iso_xmit_cmd, next_i);
2074         prev = dma_region_i(&xmit->prog, struct iso_xmit_cmd, prev_i);
2075
2076         /* set up the OUTPUT_MORE_IMMEDIATE descriptor */
2077         memset(next, 0, sizeof(struct iso_xmit_cmd));
2078         next->output_more_immediate.control = cpu_to_le32(0x02000008);
2079
2080         /* ISO packet header is embedded in the OUTPUT_MORE_IMMEDIATE */
2081
2082         /* tcode = 0xA, and sy */
2083         next->iso_hdr[0] = 0xA0 | (sy & 0xF);
2084
2085         /* tag and channel number */
2086         next->iso_hdr[1] = (tag << 6) | (iso->channel & 0x3F);
2087
2088         /* transmission speed */
2089         next->iso_hdr[2] = iso->speed & 0x7;
2090
2091         /* payload size */
2092         next->iso_hdr[6] = len & 0xFF;
2093         next->iso_hdr[7] = len >> 8;
2094
2095         /* set up the OUTPUT_LAST */
2096         next->output_last.control = cpu_to_le32(1 << 28);
2097         next->output_last.control |= cpu_to_le32(1 << 27); /* update timeStamp */
2098         next->output_last.control |= cpu_to_le32(3 << 20); /* want interrupt */
2099         next->output_last.control |= cpu_to_le32(3 << 18); /* enable branch */
2100         next->output_last.control |= cpu_to_le32(len);
2101
2102         /* payload bus address */
2103         next->output_last.address = cpu_to_le32(dma_region_offset_to_bus(&iso->data_buf, offset));
2104
2105         /* leave branchAddress at zero for now */
2106
2107         /* re-write the previous DMA descriptor to chain to this one */
2108
2109         /* set prev branch address to point to next (Z=3) */
2110         prev->output_last.branchAddress = cpu_to_le32(
2111                 dma_prog_region_offset_to_bus(&xmit->prog, sizeof(struct iso_xmit_cmd) * next_i) | 3);
2112
2113         /* disable interrupt, unless required by the IRQ interval */
2114         if (prev_i % iso->irq_interval) {
2115                 prev->output_last.control &= cpu_to_le32(~(3 << 20)); /* no interrupt */
2116         } else {
2117                 prev->output_last.control |= cpu_to_le32(3 << 20); /* enable interrupt */
2118         }
2119
2120         wmb();
2121
2122         /* wake DMA in case it is sleeping */
2123         reg_write(xmit->ohci, xmit->ContextControlSet, 1 << 12);
2124
2125         /* issue a dummy read of the cycle timer to force all PCI
2126            writes to be posted immediately */
2127         mb();
2128         reg_read(xmit->ohci, OHCI1394_IsochronousCycleTimer);
2129
2130         return 0;
2131 }
2132
2133 static int ohci_iso_xmit_start(struct hpsb_iso *iso, int cycle)
2134 {
2135         struct ohci_iso_xmit *xmit = iso->hostdata;
2136         struct ti_ohci *ohci = xmit->ohci;
2137
2138         /* clear out the control register */
2139         reg_write(xmit->ohci, xmit->ContextControlClear, 0xFFFFFFFF);
2140         wmb();
2141
2142         /* address and length of first descriptor block (Z=3) */
2143         reg_write(xmit->ohci, xmit->CommandPtr,
2144                   dma_prog_region_offset_to_bus(&xmit->prog, iso->pkt_dma * sizeof(struct iso_xmit_cmd)) | 3);
2145
2146         /* cycle match */
2147         if (cycle != -1) {
2148                 u32 start = cycle & 0x1FFF;
2149
2150                 /* 'cycle' is only mod 8000, but we also need two 'seconds' bits -
2151                    just snarf them from the current time */
2152                 u32 seconds = reg_read(xmit->ohci, OHCI1394_IsochronousCycleTimer) >> 25;
2153
2154                 /* advance one second to give some extra time for DMA to start */
2155                 seconds += 1;
2156
2157                 start |= (seconds & 3) << 13;
2158
2159                 reg_write(xmit->ohci, xmit->ContextControlSet, 0x80000000 | (start << 16));
2160         }
2161
2162         /* enable interrupts */
2163         reg_write(xmit->ohci, OHCI1394_IsoXmitIntMaskSet, 1 << xmit->task.context);
2164
2165         /* run */
2166         reg_write(xmit->ohci, xmit->ContextControlSet, 0x8000);
2167         mb();
2168
2169         /* wait 100 usec to give the card time to go active */
2170         udelay(100);
2171
2172         /* check the RUN bit */
2173         if (!(reg_read(xmit->ohci, xmit->ContextControlSet) & 0x8000)) {
2174                 PRINT(KERN_ERR, "Error starting IT DMA (ContextControl 0x%08x)\n",
2175                       reg_read(xmit->ohci, xmit->ContextControlSet));
2176                 return -1;
2177         }
2178
2179         return 0;
2180 }
2181
2182 static int ohci_isoctl(struct hpsb_iso *iso, enum isoctl_cmd cmd, unsigned long arg)
2183 {
2184
2185         switch(cmd) {
2186         case XMIT_INIT:
2187                 return ohci_iso_xmit_init(iso);
2188         case XMIT_START:
2189                 return ohci_iso_xmit_start(iso, arg);
2190         case XMIT_STOP:
2191                 ohci_iso_xmit_stop(iso);
2192                 return 0;
2193         case XMIT_QUEUE:
2194                 return ohci_iso_xmit_queue(iso, (struct hpsb_iso_packet_info*) arg);
2195         case XMIT_SHUTDOWN:
2196                 ohci_iso_xmit_shutdown(iso);
2197                 return 0;
2198
2199         case RECV_INIT:
2200                 return ohci_iso_recv_init(iso);
2201         case RECV_START: {
2202                 int *args = (int*) arg;
2203                 return ohci_iso_recv_start(iso, args[0], args[1], args[2]);
2204         }
2205         case RECV_STOP:
2206                 ohci_iso_recv_stop(iso);
2207                 return 0;
2208         case RECV_RELEASE:
2209                 ohci_iso_recv_release(iso, (struct hpsb_iso_packet_info*) arg);
2210                 return 0;
2211         case RECV_FLUSH:
2212                 ohci_iso_recv_task((unsigned long) iso);
2213                 return 0;
2214         case RECV_SHUTDOWN:
2215                 ohci_iso_recv_shutdown(iso);
2216                 return 0;
2217         case RECV_LISTEN_CHANNEL:
2218                 ohci_iso_recv_change_channel(iso, arg, 1);
2219                 return 0;
2220         case RECV_UNLISTEN_CHANNEL:
2221                 ohci_iso_recv_change_channel(iso, arg, 0);
2222                 return 0;
2223         case RECV_SET_CHANNEL_MASK:
2224                 ohci_iso_recv_set_channel_mask(iso, *((u64*) arg));
2225                 return 0;
2226
2227         default:
2228                 PRINT_G(KERN_ERR, "ohci_isoctl cmd %d not implemented yet",
2229                         cmd);
2230                 break;
2231         }
2232         return -EINVAL;
2233 }
2234
2235 /***************************************
2236  * IEEE-1394 functionality section END *
2237  ***************************************/
2238
2239
2240 /********************************************************
2241  * Global stuff (interrupt handler, init/shutdown code) *
2242  ********************************************************/
2243
2244 static void dma_trm_reset(struct dma_trm_ctx *d)
2245 {
2246         unsigned long flags;
2247         LIST_HEAD(packet_list);
2248         struct ti_ohci *ohci = d->ohci;
2249         struct hpsb_packet *packet, *ptmp;
2250
2251         ohci1394_stop_context(ohci, d->ctrlClear, NULL);
2252
2253         /* Lock the context, reset it and release it. Move the packets
2254          * that were pending in the context to packet_list and free
2255          * them after releasing the lock. */
2256
2257         spin_lock_irqsave(&d->lock, flags);
2258
2259         list_splice(&d->fifo_list, &packet_list);
2260         list_splice(&d->pending_list, &packet_list);
2261         INIT_LIST_HEAD(&d->fifo_list);
2262         INIT_LIST_HEAD(&d->pending_list);
2263
2264         d->branchAddrPtr = NULL;
2265         d->sent_ind = d->prg_ind;
2266         d->free_prgs = d->num_desc;
2267
2268         spin_unlock_irqrestore(&d->lock, flags);
2269
2270         if (list_empty(&packet_list))
2271                 return;
2272
2273         PRINT(KERN_INFO, "AT dma reset ctx=%d, aborting transmission", d->ctx);
2274
2275         /* Now process subsystem callbacks for the packets from this
2276          * context. */
2277         list_for_each_entry_safe(packet, ptmp, &packet_list, driver_list) {
2278                 list_del_init(&packet->driver_list);
2279                 hpsb_packet_sent(ohci->host, packet, ACKX_ABORTED);
2280         }
2281 }
2282
2283 static void ohci_schedule_iso_tasklets(struct ti_ohci *ohci,
2284                                        quadlet_t rx_event,
2285                                        quadlet_t tx_event)
2286 {
2287         struct ohci1394_iso_tasklet *t;
2288         unsigned long mask;
2289         unsigned long flags;
2290
2291         spin_lock_irqsave(&ohci->iso_tasklet_list_lock, flags);
2292
2293         list_for_each_entry(t, &ohci->iso_tasklet_list, link) {
2294                 mask = 1 << t->context;
2295
2296                 if (t->type == OHCI_ISO_TRANSMIT && tx_event & mask)
2297                         tasklet_schedule(&t->tasklet);
2298                 else if (rx_event & mask)
2299                         tasklet_schedule(&t->tasklet);
2300         }
2301
2302         spin_unlock_irqrestore(&ohci->iso_tasklet_list_lock, flags);
2303 }
2304
2305 static irqreturn_t ohci_irq_handler(int irq, void *dev_id,
2306                              struct pt_regs *regs_are_unused)
2307 {
2308         quadlet_t event, node_id;
2309         struct ti_ohci *ohci = (struct ti_ohci *)dev_id;
2310         struct hpsb_host *host = ohci->host;
2311         int phyid = -1, isroot = 0;
2312         unsigned long flags;
2313
2314         /* Read and clear the interrupt event register.  Don't clear
2315          * the busReset event, though. This is done when we get the
2316          * selfIDComplete interrupt. */
2317         spin_lock_irqsave(&ohci->event_lock, flags);
2318         event = reg_read(ohci, OHCI1394_IntEventClear);
2319         reg_write(ohci, OHCI1394_IntEventClear, event & ~OHCI1394_busReset);
2320         spin_unlock_irqrestore(&ohci->event_lock, flags);
2321
2322         if (!event)
2323                 return IRQ_NONE;
2324
2325         /* If event is ~(u32)0 cardbus card was ejected.  In this case
2326          * we just return, and clean up in the ohci1394_pci_remove
2327          * function. */
2328         if (event == ~(u32) 0) {
2329                 DBGMSG("Device removed.");
2330                 return IRQ_NONE;
2331         }
2332
2333         DBGMSG("IntEvent: %08x", event);
2334
2335         if (event & OHCI1394_unrecoverableError) {
2336                 int ctx;
2337                 PRINT(KERN_ERR, "Unrecoverable error!");
2338
2339                 if (reg_read(ohci, OHCI1394_AsReqTrContextControlSet) & 0x800)
2340                         PRINT(KERN_ERR, "Async Req Tx Context died: "
2341                                 "ctrl[%08x] cmdptr[%08x]",
2342                                 reg_read(ohci, OHCI1394_AsReqTrContextControlSet),
2343                                 reg_read(ohci, OHCI1394_AsReqTrCommandPtr));
2344
2345                 if (reg_read(ohci, OHCI1394_AsRspTrContextControlSet) & 0x800)
2346                         PRINT(KERN_ERR, "Async Rsp Tx Context died: "
2347                                 "ctrl[%08x] cmdptr[%08x]",
2348                                 reg_read(ohci, OHCI1394_AsRspTrContextControlSet),
2349                                 reg_read(ohci, OHCI1394_AsRspTrCommandPtr));
2350
2351                 if (reg_read(ohci, OHCI1394_AsReqRcvContextControlSet) & 0x800)
2352                         PRINT(KERN_ERR, "Async Req Rcv Context died: "
2353                                 "ctrl[%08x] cmdptr[%08x]",
2354                                 reg_read(ohci, OHCI1394_AsReqRcvContextControlSet),
2355                                 reg_read(ohci, OHCI1394_AsReqRcvCommandPtr));
2356
2357                 if (reg_read(ohci, OHCI1394_AsRspRcvContextControlSet) & 0x800)
2358                         PRINT(KERN_ERR, "Async Rsp Rcv Context died: "
2359                                 "ctrl[%08x] cmdptr[%08x]",
2360                                 reg_read(ohci, OHCI1394_AsRspRcvContextControlSet),
2361                                 reg_read(ohci, OHCI1394_AsRspRcvCommandPtr));
2362
2363                 for (ctx = 0; ctx < ohci->nb_iso_xmit_ctx; ctx++) {
2364                         if (reg_read(ohci, OHCI1394_IsoXmitContextControlSet + (16 * ctx)) & 0x800)
2365                                 PRINT(KERN_ERR, "Iso Xmit %d Context died: "
2366                                         "ctrl[%08x] cmdptr[%08x]", ctx,
2367                                         reg_read(ohci, OHCI1394_IsoXmitContextControlSet + (16 * ctx)),
2368                                         reg_read(ohci, OHCI1394_IsoXmitCommandPtr + (16 * ctx)));
2369                 }
2370
2371                 for (ctx = 0; ctx < ohci->nb_iso_rcv_ctx; ctx++) {
2372                         if (reg_read(ohci, OHCI1394_IsoRcvContextControlSet + (32 * ctx)) & 0x800)
2373                                 PRINT(KERN_ERR, "Iso Recv %d Context died: "
2374                                         "ctrl[%08x] cmdptr[%08x] match[%08x]", ctx,
2375                                         reg_read(ohci, OHCI1394_IsoRcvContextControlSet + (32 * ctx)),
2376                                         reg_read(ohci, OHCI1394_IsoRcvCommandPtr + (32 * ctx)),
2377                                         reg_read(ohci, OHCI1394_IsoRcvContextMatch + (32 * ctx)));
2378                 }
2379
2380                 event &= ~OHCI1394_unrecoverableError;
2381         }
2382         if (event & OHCI1394_postedWriteErr) {
2383                 PRINT(KERN_ERR, "physical posted write error");
2384                 /* no recovery strategy yet, had to involve protocol drivers */
2385         }
2386         if (event & OHCI1394_cycleTooLong) {
2387                 if(printk_ratelimit())
2388                         PRINT(KERN_WARNING, "isochronous cycle too long");
2389                 else
2390                         DBGMSG("OHCI1394_cycleTooLong");
2391                 reg_write(ohci, OHCI1394_LinkControlSet,
2392                           OHCI1394_LinkControl_CycleMaster);
2393                 event &= ~OHCI1394_cycleTooLong;
2394         }
2395         if (event & OHCI1394_cycleInconsistent) {
2396                 /* We subscribe to the cycleInconsistent event only to
2397                  * clear the corresponding event bit... otherwise,
2398                  * isochronous cycleMatch DMA won't work. */
2399                 DBGMSG("OHCI1394_cycleInconsistent");
2400                 event &= ~OHCI1394_cycleInconsistent;
2401         }
2402         if (event & OHCI1394_busReset) {
2403                 /* The busReset event bit can't be cleared during the
2404                  * selfID phase, so we disable busReset interrupts, to
2405                  * avoid burying the cpu in interrupt requests. */
2406                 spin_lock_irqsave(&ohci->event_lock, flags);
2407                 reg_write(ohci, OHCI1394_IntMaskClear, OHCI1394_busReset);
2408
2409                 if (ohci->check_busreset) {
2410                         int loop_count = 0;
2411
2412                         udelay(10);
2413
2414                         while (reg_read(ohci, OHCI1394_IntEventSet) & OHCI1394_busReset) {
2415                                 reg_write(ohci, OHCI1394_IntEventClear, OHCI1394_busReset);
2416
2417                                 spin_unlock_irqrestore(&ohci->event_lock, flags);
2418                                 udelay(10);
2419                                 spin_lock_irqsave(&ohci->event_lock, flags);
2420
2421                                 /* The loop counter check is to prevent the driver
2422                                  * from remaining in this state forever. For the
2423                                  * initial bus reset, the loop continues for ever
2424                                  * and the system hangs, until some device is plugged-in
2425                                  * or out manually into a port! The forced reset seems
2426                                  * to solve this problem. This mainly effects nForce2. */
2427                                 if (loop_count > 10000) {
2428                                         ohci_devctl(host, RESET_BUS, LONG_RESET);
2429                                         DBGMSG("Detected bus-reset loop. Forced a bus reset!");
2430                                         loop_count = 0;
2431                                 }
2432
2433                                 loop_count++;
2434                         }
2435                 }
2436                 spin_unlock_irqrestore(&ohci->event_lock, flags);
2437                 if (!host->in_bus_reset) {
2438                         DBGMSG("irq_handler: Bus reset requested");
2439
2440                         /* Subsystem call */
2441                         hpsb_bus_reset(ohci->host);
2442                 }
2443                 event &= ~OHCI1394_busReset;
2444         }
2445         if (event & OHCI1394_reqTxComplete) {
2446                 struct dma_trm_ctx *d = &ohci->at_req_context;
2447                 DBGMSG("Got reqTxComplete interrupt "
2448                        "status=0x%08X", reg_read(ohci, d->ctrlSet));
2449                 if (reg_read(ohci, d->ctrlSet) & 0x800)
2450                         ohci1394_stop_context(ohci, d->ctrlClear,
2451                                               "reqTxComplete");
2452                 else
2453                         dma_trm_tasklet((unsigned long)d);
2454                         //tasklet_schedule(&d->task);
2455                 event &= ~OHCI1394_reqTxComplete;
2456         }
2457         if (event & OHCI1394_respTxComplete) {
2458                 struct dma_trm_ctx *d = &ohci->at_resp_context;
2459                 DBGMSG("Got respTxComplete interrupt "
2460                        "status=0x%08X", reg_read(ohci, d->ctrlSet));
2461                 if (reg_read(ohci, d->ctrlSet) & 0x800)
2462                         ohci1394_stop_context(ohci, d->ctrlClear,
2463                                               "respTxComplete");
2464                 else
2465                         tasklet_schedule(&d->task);
2466                 event &= ~OHCI1394_respTxComplete;
2467         }
2468         if (event & OHCI1394_RQPkt) {
2469                 struct dma_rcv_ctx *d = &ohci->ar_req_context;
2470                 DBGMSG("Got RQPkt interrupt status=0x%08X",
2471                        reg_read(ohci, d->ctrlSet));
2472                 if (reg_read(ohci, d->ctrlSet) & 0x800)
2473                         ohci1394_stop_context(ohci, d->ctrlClear, "RQPkt");
2474                 else
2475                         tasklet_schedule(&d->task);
2476                 event &= ~OHCI1394_RQPkt;
2477         }
2478         if (event & OHCI1394_RSPkt) {
2479                 struct dma_rcv_ctx *d = &ohci->ar_resp_context;
2480                 DBGMSG("Got RSPkt interrupt status=0x%08X",
2481                        reg_read(ohci, d->ctrlSet));
2482                 if (reg_read(ohci, d->ctrlSet) & 0x800)
2483                         ohci1394_stop_context(ohci, d->ctrlClear, "RSPkt");
2484                 else
2485                         tasklet_schedule(&d->task);
2486                 event &= ~OHCI1394_RSPkt;
2487         }
2488         if (event & OHCI1394_isochRx) {
2489                 quadlet_t rx_event;
2490
2491                 rx_event = reg_read(ohci, OHCI1394_IsoRecvIntEventSet);
2492                 reg_write(ohci, OHCI1394_IsoRecvIntEventClear, rx_event);
2493                 ohci_schedule_iso_tasklets(ohci, rx_event, 0);
2494                 event &= ~OHCI1394_isochRx;
2495         }
2496         if (event & OHCI1394_isochTx) {
2497                 quadlet_t tx_event;
2498
2499                 tx_event = reg_read(ohci, OHCI1394_IsoXmitIntEventSet);
2500                 reg_write(ohci, OHCI1394_IsoXmitIntEventClear, tx_event);
2501                 ohci_schedule_iso_tasklets(ohci, 0, tx_event);
2502                 event &= ~OHCI1394_isochTx;
2503         }
2504         if (event & OHCI1394_selfIDComplete) {
2505                 if (host->in_bus_reset) {
2506                         node_id = reg_read(ohci, OHCI1394_NodeID);
2507
2508                         if (!(node_id & 0x80000000)) {
2509                                 PRINT(KERN_ERR,
2510                                       "SelfID received, but NodeID invalid "
2511                                       "(probably new bus reset occurred): %08X",
2512                                       node_id);
2513                                 goto selfid_not_valid;
2514                         }
2515
2516                         phyid =  node_id & 0x0000003f;
2517                         isroot = (node_id & 0x40000000) != 0;
2518
2519                         DBGMSG("SelfID interrupt received "
2520                               "(phyid %d, %s)", phyid,
2521                               (isroot ? "root" : "not root"));
2522
2523                         handle_selfid(ohci, host, phyid, isroot);
2524
2525                         /* Clear the bus reset event and re-enable the
2526                          * busReset interrupt.  */
2527                         spin_lock_irqsave(&ohci->event_lock, flags);
2528                         reg_write(ohci, OHCI1394_IntEventClear, OHCI1394_busReset);
2529                         reg_write(ohci, OHCI1394_IntMaskSet, OHCI1394_busReset);
2530                         spin_unlock_irqrestore(&ohci->event_lock, flags);
2531
2532                         /* Turn on phys dma reception.
2533                          *
2534                          * TODO: Enable some sort of filtering management.
2535                          */
2536                         if (phys_dma) {
2537                                 reg_write(ohci, OHCI1394_PhyReqFilterHiSet,
2538                                           0xffffffff);
2539                                 reg_write(ohci, OHCI1394_PhyReqFilterLoSet,
2540                                           0xffffffff);
2541                         }
2542
2543                         DBGMSG("PhyReqFilter=%08x%08x",
2544                                reg_read(ohci, OHCI1394_PhyReqFilterHiSet),
2545                                reg_read(ohci, OHCI1394_PhyReqFilterLoSet));
2546
2547                         hpsb_selfid_complete(host, phyid, isroot);
2548                 } else
2549                         PRINT(KERN_ERR,
2550                               "SelfID received outside of bus reset sequence");
2551
2552 selfid_not_valid:
2553                 event &= ~OHCI1394_selfIDComplete;
2554         }
2555
2556         /* Make sure we handle everything, just in case we accidentally
2557          * enabled an interrupt that we didn't write a handler for.  */
2558         if (event)
2559                 PRINT(KERN_ERR, "Unhandled interrupt(s) 0x%08x",
2560                       event);
2561
2562         return IRQ_HANDLED;
2563 }
2564
2565 /* Put the buffer back into the dma context */
2566 static void insert_dma_buffer(struct dma_rcv_ctx *d, int idx)
2567 {
2568         struct ti_ohci *ohci = (struct ti_ohci*)(d->ohci);
2569         DBGMSG("Inserting dma buf ctx=%d idx=%d", d->ctx, idx);
2570
2571         d->prg_cpu[idx]->status = cpu_to_le32(d->buf_size);
2572         d->prg_cpu[idx]->branchAddress &= le32_to_cpu(0xfffffff0);
2573         idx = (idx + d->num_desc - 1 ) % d->num_desc;
2574         d->prg_cpu[idx]->branchAddress |= le32_to_cpu(0x00000001);
2575
2576         /* To avoid a race, ensure 1394 interface hardware sees the inserted
2577          * context program descriptors before it sees the wakeup bit set. */
2578         wmb();
2579         
2580         /* wake up the dma context if necessary */
2581         if (!(reg_read(ohci, d->ctrlSet) & 0x400)) {
2582                 PRINT(KERN_INFO,
2583                       "Waking dma ctx=%d ... processing is probably too slow",
2584                       d->ctx);
2585         }
2586
2587         /* do this always, to avoid race condition */
2588         reg_write(ohci, d->ctrlSet, 0x1000);
2589 }
2590
2591 #define cond_le32_to_cpu(data, noswap) \
2592         (noswap ? data : le32_to_cpu(data))
2593
2594 static const int TCODE_SIZE[16] = {20, 0, 16, -1, 16, 20, 20, 0,
2595                             -1, 0, -1, 0, -1, -1, 16, -1};
2596
2597 /*
2598  * Determine the length of a packet in the buffer
2599  * Optimization suggested by Pascal Drolet <pascal.drolet@informission.ca>
2600  */
2601 static inline int packet_length(struct dma_rcv_ctx *d, int idx,
2602                                 quadlet_t *buf_ptr, int offset,
2603                                 unsigned char tcode, int noswap)
2604 {
2605         int length = -1;
2606
2607         if (d->type == DMA_CTX_ASYNC_REQ || d->type == DMA_CTX_ASYNC_RESP) {
2608                 length = TCODE_SIZE[tcode];
2609                 if (length == 0) {
2610                         if (offset + 12 >= d->buf_size) {
2611                                 length = (cond_le32_to_cpu(d->buf_cpu[(idx + 1) % d->num_desc]
2612                                                 [3 - ((d->buf_size - offset) >> 2)], noswap) >> 16);
2613                         } else {
2614                                 length = (cond_le32_to_cpu(buf_ptr[3], noswap) >> 16);
2615                         }
2616                         length += 20;
2617                 }
2618         } else if (d->type == DMA_CTX_ISO) {
2619                 /* Assumption: buffer fill mode with header/trailer */
2620                 length = (cond_le32_to_cpu(buf_ptr[0], noswap) >> 16) + 8;
2621         }
2622
2623         if (length > 0 && length % 4)
2624                 length += 4 - (length % 4);
2625
2626         return length;
2627 }
2628
2629 /* Tasklet that processes dma receive buffers */
2630 static void dma_rcv_tasklet (unsigned long data)
2631 {
2632         struct dma_rcv_ctx *d = (struct dma_rcv_ctx*)data;
2633         struct ti_ohci *ohci = (struct ti_ohci*)(d->ohci);
2634         unsigned int split_left, idx, offset, rescount;
2635         unsigned char tcode;
2636         int length, bytes_left, ack;
2637         unsigned long flags;
2638         quadlet_t *buf_ptr;
2639         char *split_ptr;
2640         char msg[256];
2641
2642         spin_lock_irqsave(&d->lock, flags);
2643
2644         idx = d->buf_ind;
2645         offset = d->buf_offset;
2646         buf_ptr = d->buf_cpu[idx] + offset/4;
2647
2648         rescount = le32_to_cpu(d->prg_cpu[idx]->status) & 0xffff;
2649         bytes_left = d->buf_size - rescount - offset;
2650
2651         while (bytes_left > 0) {
2652                 tcode = (cond_le32_to_cpu(buf_ptr[0], ohci->no_swap_incoming) >> 4) & 0xf;
2653
2654                 /* packet_length() will return < 4 for an error */
2655                 length = packet_length(d, idx, buf_ptr, offset, tcode, ohci->no_swap_incoming);
2656
2657                 if (length < 4) { /* something is wrong */
2658                         sprintf(msg,"Unexpected tcode 0x%x(0x%08x) in AR ctx=%d, length=%d",
2659                                 tcode, cond_le32_to_cpu(buf_ptr[0], ohci->no_swap_incoming),
2660                                 d->ctx, length);
2661                         ohci1394_stop_context(ohci, d->ctrlClear, msg);
2662                         spin_unlock_irqrestore(&d->lock, flags);
2663                         return;
2664                 }
2665
2666                 /* The first case is where we have a packet that crosses
2667                  * over more than one descriptor. The next case is where
2668                  * it's all in the first descriptor.  */
2669                 if ((offset + length) > d->buf_size) {
2670                         DBGMSG("Split packet rcv'd");
2671                         if (length > d->split_buf_size) {
2672                                 ohci1394_stop_context(ohci, d->ctrlClear,
2673                                              "Split packet size exceeded");
2674                                 d->buf_ind = idx;
2675                                 d->buf_offset = offset;
2676                                 spin_unlock_irqrestore(&d->lock, flags);
2677                                 return;
2678                         }
2679
2680                         if (le32_to_cpu(d->prg_cpu[(idx+1)%d->num_desc]->status)
2681                             == d->buf_size) {
2682                                 /* Other part of packet not written yet.
2683                                  * this should never happen I think
2684                                  * anyway we'll get it on the next call.  */
2685                                 PRINT(KERN_INFO,
2686                                       "Got only half a packet!");
2687                                 d->buf_ind = idx;
2688                                 d->buf_offset = offset;
2689                                 spin_unlock_irqrestore(&d->lock, flags);
2690                                 return;
2691                         }
2692
2693                         split_left = length;
2694                         split_ptr = (char *)d->spb;
2695                         memcpy(split_ptr,buf_ptr,d->buf_size-offset);
2696                         split_left -= d->buf_size-offset;
2697                         split_ptr += d->buf_size-offset;
2698                         insert_dma_buffer(d, idx);
2699                         idx = (idx+1) % d->num_desc;
2700                         buf_ptr = d->buf_cpu[idx];
2701                         offset=0;
2702
2703                         while (split_left >= d->buf_size) {
2704                                 memcpy(split_ptr,buf_ptr,d->buf_size);
2705                                 split_ptr += d->buf_size;
2706                                 split_left -= d->buf_size;
2707                                 insert_dma_buffer(d, idx);
2708                                 idx = (idx+1) % d->num_desc;
2709                                 buf_ptr = d->buf_cpu[idx];
2710                         }
2711
2712                         if (split_left > 0) {
2713                                 memcpy(split_ptr, buf_ptr, split_left);
2714                                 offset = split_left;
2715                                 buf_ptr += offset/4;
2716                         }
2717                 } else {
2718                         DBGMSG("Single packet rcv'd");
2719                         memcpy(d->spb, buf_ptr, length);
2720                         offset += length;
2721                         buf_ptr += length/4;
2722                         if (offset==d->buf_size) {
2723                                 insert_dma_buffer(d, idx);
2724                                 idx = (idx+1) % d->num_desc;
2725                                 buf_ptr = d->buf_cpu[idx];
2726                                 offset=0;
2727                         }
2728                 }
2729
2730                 /* We get one phy packet to the async descriptor for each
2731                  * bus reset. We always ignore it.  */
2732                 if (tcode != OHCI1394_TCODE_PHY) {
2733                         if (!ohci->no_swap_incoming)
2734                                 packet_swab(d->spb, tcode);
2735                         DBGMSG("Packet received from node"
2736                                 " %d ack=0x%02X spd=%d tcode=0x%X"
2737                                 " length=%d ctx=%d tlabel=%d",
2738                                 (d->spb[1]>>16)&0x3f,
2739                                 (cond_le32_to_cpu(d->spb[length/4-1], ohci->no_swap_incoming)>>16)&0x1f,
2740                                 (cond_le32_to_cpu(d->spb[length/4-1], ohci->no_swap_incoming)>>21)&0x3,
2741                                 tcode, length, d->ctx,
2742                                 (cond_le32_to_cpu(d->spb[0], ohci->no_swap_incoming)>>10)&0x3f);
2743
2744                         ack = (((cond_le32_to_cpu(d->spb[length/4-1], ohci->no_swap_incoming)>>16)&0x1f)
2745                                 == 0x11) ? 1 : 0;
2746
2747                         hpsb_packet_received(ohci->host, d->spb,
2748                                              length-4, ack);
2749                 }
2750 #ifdef OHCI1394_DEBUG
2751                 else
2752                         PRINT (KERN_DEBUG, "Got phy packet ctx=%d ... discarded",
2753                                d->ctx);
2754 #endif
2755
2756                 rescount = le32_to_cpu(d->prg_cpu[idx]->status) & 0xffff;
2757
2758                 bytes_left = d->buf_size - rescount - offset;
2759
2760         }
2761
2762         d->buf_ind = idx;
2763         d->buf_offset = offset;
2764
2765         spin_unlock_irqrestore(&d->lock, flags);
2766 }
2767
2768 /* Bottom half that processes sent packets */
2769 static void dma_trm_tasklet (unsigned long data)
2770 {
2771         struct dma_trm_ctx *d = (struct dma_trm_ctx*)data;
2772         struct ti_ohci *ohci = (struct ti_ohci*)(d->ohci);
2773         struct hpsb_packet *packet, *ptmp;
2774         unsigned long flags;
2775         u32 status, ack;
2776         size_t datasize;
2777
2778         spin_lock_irqsave(&d->lock, flags);
2779
2780         list_for_each_entry_safe(packet, ptmp, &d->fifo_list, driver_list) {
2781                 datasize = packet->data_size;
2782                 if (datasize && packet->type != hpsb_raw)
2783                         status = le32_to_cpu(
2784                                 d->prg_cpu[d->sent_ind]->end.status) >> 16;
2785                 else
2786                         status = le32_to_cpu(
2787                                 d->prg_cpu[d->sent_ind]->begin.status) >> 16;
2788
2789                 if (status == 0)
2790                         /* this packet hasn't been sent yet*/
2791                         break;
2792
2793 #ifdef OHCI1394_DEBUG
2794                 if (datasize)
2795                         if (((le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])>>4)&0xf) == 0xa)
2796                                 DBGMSG("Stream packet sent to channel %d tcode=0x%X "
2797                                        "ack=0x%X spd=%d dataLength=%d ctx=%d",
2798                                        (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])>>8)&0x3f,
2799                                        (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])>>4)&0xf,
2800                                        status&0x1f, (status>>5)&0x3,
2801                                        le32_to_cpu(d->prg_cpu[d->sent_ind]->data[1])>>16,
2802                                        d->ctx);
2803                         else
2804                                 DBGMSG("Packet sent to node %d tcode=0x%X tLabel="
2805                                        "%d ack=0x%X spd=%d dataLength=%d ctx=%d",
2806                                        (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[1])>>16)&0x3f,
2807                                        (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])>>4)&0xf,
2808                                        (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])>>10)&0x3f,
2809                                        status&0x1f, (status>>5)&0x3,
2810                                        le32_to_cpu(d->prg_cpu[d->sent_ind]->data[3])>>16,
2811                                        d->ctx);
2812                 else
2813                         DBGMSG("Packet sent to node %d tcode=0x%X tLabel="
2814                                "%d ack=0x%X spd=%d data=0x%08X ctx=%d",
2815                                 (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[1])
2816                                         >>16)&0x3f,
2817                                 (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])
2818                                         >>4)&0xf,
2819                                 (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])
2820                                         >>10)&0x3f,
2821                                 status&0x1f, (status>>5)&0x3,
2822                                 le32_to_cpu(d->prg_cpu[d->sent_ind]->data[3]),
2823                                 d->ctx);
2824 #endif
2825
2826                 if (status & 0x10) {
2827                         ack = status & 0xf;
2828                 } else {
2829                         switch (status & 0x1f) {
2830                         case EVT_NO_STATUS: /* that should never happen */
2831                         case EVT_RESERVED_A: /* that should never happen */
2832                         case EVT_LONG_PACKET: /* that should never happen */
2833                                 PRINT(KERN_WARNING, "Received OHCI evt_* error 0x%x", status & 0x1f);
2834                                 ack = ACKX_SEND_ERROR;
2835                                 break;
2836                         case EVT_MISSING_ACK:
2837                                 ack = ACKX_TIMEOUT;
2838                                 break;
2839                         case EVT_UNDERRUN:
2840                                 ack = ACKX_SEND_ERROR;
2841                                 break;
2842                         case EVT_OVERRUN: /* that should never happen */
2843                                 PRINT(KERN_WARNING, "Received OHCI evt_* error 0x%x", status & 0x1f);
2844                                 ack = ACKX_SEND_ERROR;
2845                                 break;
2846                         case EVT_DESCRIPTOR_READ:
2847                         case EVT_DATA_READ:
2848                         case EVT_DATA_WRITE:
2849                                 ack = ACKX_SEND_ERROR;
2850                                 break;
2851                         case EVT_BUS_RESET: /* that should never happen */
2852                                 PRINT(KERN_WARNING, "Received OHCI evt_* error 0x%x", status & 0x1f);
2853                                 ack = ACKX_SEND_ERROR;
2854                                 break;
2855                         case EVT_TIMEOUT:
2856                                 ack = ACKX_TIMEOUT;
2857                                 break;
2858                         case EVT_TCODE_ERR:
2859                                 ack = ACKX_SEND_ERROR;
2860                                 break;
2861                         case EVT_RESERVED_B: /* that should never happen */
2862                         case EVT_RESERVED_C: /* that should never happen */
2863                                 PRINT(KERN_WARNING, "Received OHCI evt_* error 0x%x", status & 0x1f);
2864                                 ack = ACKX_SEND_ERROR;
2865                                 break;
2866                         case EVT_UNKNOWN:
2867                         case EVT_FLUSHED:
2868                                 ack = ACKX_SEND_ERROR;
2869                                 break;
2870                         default:
2871                                 PRINT(KERN_ERR, "Unhandled OHCI evt_* error 0x%x", status & 0x1f);
2872                                 ack = ACKX_SEND_ERROR;
2873                                 BUG();
2874                         }
2875                 }
2876
2877                 list_del_init(&packet->driver_list);
2878                 hpsb_packet_sent(ohci->host, packet, ack);
2879
2880                 if (datasize) {
2881                         pci_unmap_single(ohci->dev,
2882                                          cpu_to_le32(d->prg_cpu[d->sent_ind]->end.address),
2883                                          datasize, PCI_DMA_TODEVICE);
2884                         OHCI_DMA_FREE("single Xmit data packet");
2885                 }
2886
2887                 d->sent_ind = (d->sent_ind+1)%d->num_desc;
2888                 d->free_prgs++;
2889         }
2890
2891         dma_trm_flush(ohci, d);
2892
2893         spin_unlock_irqrestore(&d->lock, flags);
2894 }
2895
2896 static void stop_dma_rcv_ctx(struct dma_rcv_ctx *d)
2897 {
2898         if (d->ctrlClear) {
2899                 ohci1394_stop_context(d->ohci, d->ctrlClear, NULL);
2900
2901                 if (d->type == DMA_CTX_ISO) {
2902                         /* disable interrupts */
2903                         reg_write(d->ohci, OHCI1394_IsoRecvIntMaskClear, 1 << d->ctx);
2904                         ohci1394_unregister_iso_tasklet(d->ohci, &d->ohci->ir_legacy_tasklet);
2905                 } else {
2906                         tasklet_kill(&d->task);
2907                 }
2908         }
2909 }
2910
2911
2912 static void free_dma_rcv_ctx(struct dma_rcv_ctx *d)
2913 {
2914         int i;
2915         struct ti_ohci *ohci = d->ohci;
2916
2917         if (ohci == NULL)
2918                 return;
2919
2920         DBGMSG("Freeing dma_rcv_ctx %d", d->ctx);
2921
2922         if (d->buf_cpu) {
2923                 for (i=0; i<d->num_desc; i++)
2924                         if (d->buf_cpu[i] && d->buf_bus[i]) {
2925                                 pci_free_consistent(
2926                                         ohci->dev, d->buf_size,
2927                                         d->buf_cpu[i], d->buf_bus[i]);
2928                                 OHCI_DMA_FREE("consistent dma_rcv buf[%d]", i);
2929                         }
2930                 kfree(d->buf_cpu);
2931                 kfree(d->buf_bus);
2932         }
2933         if (d->prg_cpu) {
2934                 for (i=0; i<d->num_desc; i++)
2935                         if (d->prg_cpu[i] && d->prg_bus[i]) {
2936                                 pci_pool_free(d->prg_pool, d->prg_cpu[i], d->prg_bus[i]);
2937                                 OHCI_DMA_FREE("consistent dma_rcv prg[%d]", i);
2938                         }
2939                 pci_pool_destroy(d->prg_pool);
2940                 OHCI_DMA_FREE("dma_rcv prg pool");
2941                 kfree(d->prg_cpu);
2942                 kfree(d->prg_bus);
2943         }
2944         kfree(d->spb);
2945
2946         /* Mark this context as freed. */
2947         d->ohci = NULL;
2948 }
2949
2950 static int
2951 alloc_dma_rcv_ctx(struct ti_ohci *ohci, struct dma_rcv_ctx *d,
2952                   enum context_type type, int ctx, int num_desc,
2953                   int buf_size, int split_buf_size, int context_base)
2954 {
2955         int i, len;
2956         static int num_allocs;
2957         static char pool_name[20];
2958
2959         d->ohci = ohci;
2960         d->type = type;
2961         d->ctx = ctx;
2962
2963         d->num_desc = num_desc;
2964         d->buf_size = buf_size;
2965         d->split_buf_size = split_buf_size;
2966
2967         d->ctrlSet = 0;
2968         d->ctrlClear = 0;
2969         d->cmdPtr = 0;
2970
2971         d->buf_cpu = kzalloc(d->num_desc * sizeof(*d->buf_cpu), GFP_ATOMIC);
2972         d->buf_bus = kzalloc(d->num_desc * sizeof(*d->buf_bus), GFP_ATOMIC);
2973
2974         if (d->buf_cpu == NULL || d->buf_bus == NULL) {
2975                 PRINT(KERN_ERR, "Failed to allocate dma buffer");
2976                 free_dma_rcv_ctx(d);
2977                 return -ENOMEM;
2978         }
2979
2980         d->prg_cpu = kzalloc(d->num_desc * sizeof(*d->prg_cpu), GFP_ATOMIC);
2981         d->prg_bus = kzalloc(d->num_desc * sizeof(*d->prg_bus), GFP_ATOMIC);
2982
2983         if (d->prg_cpu == NULL || d->prg_bus == NULL) {
2984                 PRINT(KERN_ERR, "Failed to allocate dma prg");
2985                 free_dma_rcv_ctx(d);
2986                 return -ENOMEM;
2987         }
2988
2989         d->spb = kmalloc(d->split_buf_size, GFP_ATOMIC);
2990
2991         if (d->spb == NULL) {
2992                 PRINT(KERN_ERR, "Failed to allocate split buffer");
2993                 free_dma_rcv_ctx(d);
2994                 return -ENOMEM;
2995         }
2996         
2997         len = sprintf(pool_name, "ohci1394_rcv_prg");
2998         sprintf(pool_name+len, "%d", num_allocs);
2999         d->prg_pool = pci_pool_create(pool_name, ohci->dev,
3000                                 sizeof(struct dma_cmd), 4, 0);
3001         if(d->prg_pool == NULL)
3002         {
3003                 PRINT(KERN_ERR, "pci_pool_create failed for %s", pool_name);
3004                 free_dma_rcv_ctx(d);
3005                 return -ENOMEM;
3006         }
3007         num_allocs++;
3008
3009         OHCI_DMA_ALLOC("dma_rcv prg pool");
3010
3011         for (i=0; i<d->num_desc; i++) {
3012                 d->buf_cpu[i] = pci_alloc_consistent(ohci->dev,
3013                                                      d->buf_size,
3014                                                      d->buf_bus+i);
3015                 OHCI_DMA_ALLOC("consistent dma_rcv buf[%d]", i);
3016
3017                 if (d->buf_cpu[i] != NULL) {
3018                         memset(d->buf_cpu[i], 0, d->buf_size);
3019                 } else {
3020                         PRINT(KERN_ERR,
3021                               "Failed to allocate dma buffer");
3022                         free_dma_rcv_ctx(d);
3023                         return -ENOMEM;
3024                 }
3025
3026                 d->prg_cpu[i] = pci_pool_alloc(d->prg_pool, SLAB_KERNEL, d->prg_bus+i);
3027                 OHCI_DMA_ALLOC("pool dma_rcv prg[%d]", i);
3028
3029                 if (d->prg_cpu[i] != NULL) {
3030                         memset(d->prg_cpu[i], 0, sizeof(struct dma_cmd));
3031                 } else {
3032                         PRINT(KERN_ERR,
3033                               "Failed to allocate dma prg");
3034                         free_dma_rcv_ctx(d);
3035                         return -ENOMEM;
3036                 }
3037         }
3038
3039         spin_lock_init(&d->lock);
3040
3041         if (type == DMA_CTX_ISO) {
3042                 ohci1394_init_iso_tasklet(&ohci->ir_legacy_tasklet,
3043                                           OHCI_ISO_MULTICHANNEL_RECEIVE,
3044                                           dma_rcv_tasklet, (unsigned long) d);
3045         } else {
3046                 d->ctrlSet = context_base + OHCI1394_ContextControlSet;
3047                 d->ctrlClear = context_base + OHCI1394_ContextControlClear;
3048                 d->cmdPtr = context_base + OHCI1394_ContextCommandPtr;
3049
3050                 tasklet_init (&d->task, dma_rcv_tasklet, (unsigned long) d);
3051         }
3052
3053         return 0;
3054 }
3055
3056 static void free_dma_trm_ctx(struct dma_trm_ctx *d)
3057 {
3058         int i;
3059         struct ti_ohci *ohci = d->ohci;
3060
3061         if (ohci == NULL)
3062                 return;
3063
3064         DBGMSG("Freeing dma_trm_ctx %d", d->ctx);
3065
3066         if (d->prg_cpu) {
3067                 for (i=0; i<d->num_desc; i++)
3068                         if (d->prg_cpu[i] && d->prg_bus[i]) {
3069                                 pci_pool_free(d->prg_pool, d->prg_cpu[i], d->prg_bus[i]);
3070                                 OHCI_DMA_FREE("pool dma_trm prg[%d]", i);
3071                         }
3072                 pci_pool_destroy(d->prg_pool);
3073                 OHCI_DMA_FREE("dma_trm prg pool");
3074                 kfree(d->prg_cpu);
3075                 kfree(d->prg_bus);
3076         }
3077
3078         /* Mark this context as freed. */
3079         d->ohci = NULL;
3080 }
3081
3082 static int
3083 alloc_dma_trm_ctx(struct ti_ohci *ohci, struct dma_trm_ctx *d,
3084                   enum context_type type, int ctx, int num_desc,
3085                   int context_base)
3086 {
3087         int i, len;
3088         static char pool_name[20];
3089         static int num_allocs=0;
3090
3091         d->ohci = ohci;
3092         d->type = type;