[SPARC/64] constify of_get_property return: drivers
[linux-2.6.git] / drivers / scsi / qlogicpti.c
1 /* qlogicpti.c: Performance Technologies QlogicISP sbus card driver.
2  *
3  * Copyright (C) 1996, 2006 David S. Miller (davem@davemloft.net)
4  *
5  * A lot of this driver was directly stolen from Erik H. Moe's PCI
6  * Qlogic ISP driver.  Mucho kudos to him for this code.
7  *
8  * An even bigger kudos to John Grana at Performance Technologies
9  * for providing me with the hardware to write this driver, you rule
10  * John you really do.
11  *
12  * May, 2, 1997: Added support for QLGC,isp --jj
13  */
14
15 #include <linux/kernel.h>
16 #include <linux/delay.h>
17 #include <linux/types.h>
18 #include <linux/string.h>
19 #include <linux/slab.h>
20 #include <linux/blkdev.h>
21 #include <linux/proc_fs.h>
22 #include <linux/stat.h>
23 #include <linux/init.h>
24 #include <linux/spinlock.h>
25 #include <linux/interrupt.h>
26 #include <linux/module.h>
27 #include <linux/jiffies.h>
28
29 #include <asm/byteorder.h>
30
31 #include "qlogicpti.h"
32
33 #include <asm/sbus.h>
34 #include <asm/dma.h>
35 #include <asm/system.h>
36 #include <asm/ptrace.h>
37 #include <asm/pgtable.h>
38 #include <asm/oplib.h>
39 #include <asm/io.h>
40 #include <asm/irq.h>
41
42 #include <scsi/scsi.h>
43 #include <scsi/scsi_cmnd.h>
44 #include <scsi/scsi_device.h>
45 #include <scsi/scsi_eh.h>
46 #include <scsi/scsi_tcq.h>
47 #include <scsi/scsi_host.h>
48
49 #define MAX_TARGETS     16
50 #define MAX_LUNS        8       /* 32 for 1.31 F/W */
51
52 #define DEFAULT_LOOP_COUNT      10000
53
54 #include "qlogicpti_asm.c"
55
56 static struct qlogicpti *qptichain = NULL;
57 static DEFINE_SPINLOCK(qptichain_lock);
58
59 #define PACKB(a, b)                     (((a)<<4)|(b))
60
61 static const u_char mbox_param[] = {
62         PACKB(1, 1),    /* MBOX_NO_OP */
63         PACKB(5, 5),    /* MBOX_LOAD_RAM */
64         PACKB(2, 0),    /* MBOX_EXEC_FIRMWARE */
65         PACKB(5, 5),    /* MBOX_DUMP_RAM */
66         PACKB(3, 3),    /* MBOX_WRITE_RAM_WORD */
67         PACKB(2, 3),    /* MBOX_READ_RAM_WORD */
68         PACKB(6, 6),    /* MBOX_MAILBOX_REG_TEST */
69         PACKB(2, 3),    /* MBOX_VERIFY_CHECKSUM */
70         PACKB(1, 3),    /* MBOX_ABOUT_FIRMWARE */
71         PACKB(0, 0),    /* 0x0009 */
72         PACKB(0, 0),    /* 0x000a */
73         PACKB(0, 0),    /* 0x000b */
74         PACKB(0, 0),    /* 0x000c */
75         PACKB(0, 0),    /* 0x000d */
76         PACKB(1, 2),    /* MBOX_CHECK_FIRMWARE */
77         PACKB(0, 0),    /* 0x000f */
78         PACKB(5, 5),    /* MBOX_INIT_REQ_QUEUE */
79         PACKB(6, 6),    /* MBOX_INIT_RES_QUEUE */
80         PACKB(4, 4),    /* MBOX_EXECUTE_IOCB */
81         PACKB(2, 2),    /* MBOX_WAKE_UP */
82         PACKB(1, 6),    /* MBOX_STOP_FIRMWARE */
83         PACKB(4, 4),    /* MBOX_ABORT */
84         PACKB(2, 2),    /* MBOX_ABORT_DEVICE */
85         PACKB(3, 3),    /* MBOX_ABORT_TARGET */
86         PACKB(2, 2),    /* MBOX_BUS_RESET */
87         PACKB(2, 3),    /* MBOX_STOP_QUEUE */
88         PACKB(2, 3),    /* MBOX_START_QUEUE */
89         PACKB(2, 3),    /* MBOX_SINGLE_STEP_QUEUE */
90         PACKB(2, 3),    /* MBOX_ABORT_QUEUE */
91         PACKB(2, 4),    /* MBOX_GET_DEV_QUEUE_STATUS */
92         PACKB(0, 0),    /* 0x001e */
93         PACKB(1, 3),    /* MBOX_GET_FIRMWARE_STATUS */
94         PACKB(1, 2),    /* MBOX_GET_INIT_SCSI_ID */
95         PACKB(1, 2),    /* MBOX_GET_SELECT_TIMEOUT */
96         PACKB(1, 3),    /* MBOX_GET_RETRY_COUNT */
97         PACKB(1, 2),    /* MBOX_GET_TAG_AGE_LIMIT */
98         PACKB(1, 2),    /* MBOX_GET_CLOCK_RATE */
99         PACKB(1, 2),    /* MBOX_GET_ACT_NEG_STATE */
100         PACKB(1, 2),    /* MBOX_GET_ASYNC_DATA_SETUP_TIME */
101         PACKB(1, 3),    /* MBOX_GET_SBUS_PARAMS */
102         PACKB(2, 4),    /* MBOX_GET_TARGET_PARAMS */
103         PACKB(2, 4),    /* MBOX_GET_DEV_QUEUE_PARAMS */
104         PACKB(0, 0),    /* 0x002a */
105         PACKB(0, 0),    /* 0x002b */
106         PACKB(0, 0),    /* 0x002c */
107         PACKB(0, 0),    /* 0x002d */
108         PACKB(0, 0),    /* 0x002e */
109         PACKB(0, 0),    /* 0x002f */
110         PACKB(2, 2),    /* MBOX_SET_INIT_SCSI_ID */
111         PACKB(2, 2),    /* MBOX_SET_SELECT_TIMEOUT */
112         PACKB(3, 3),    /* MBOX_SET_RETRY_COUNT */
113         PACKB(2, 2),    /* MBOX_SET_TAG_AGE_LIMIT */
114         PACKB(2, 2),    /* MBOX_SET_CLOCK_RATE */
115         PACKB(2, 2),    /* MBOX_SET_ACTIVE_NEG_STATE */
116         PACKB(2, 2),    /* MBOX_SET_ASYNC_DATA_SETUP_TIME */
117         PACKB(3, 3),    /* MBOX_SET_SBUS_CONTROL_PARAMS */
118         PACKB(4, 4),    /* MBOX_SET_TARGET_PARAMS */
119         PACKB(4, 4),    /* MBOX_SET_DEV_QUEUE_PARAMS */
120         PACKB(0, 0),    /* 0x003a */
121         PACKB(0, 0),    /* 0x003b */
122         PACKB(0, 0),    /* 0x003c */
123         PACKB(0, 0),    /* 0x003d */
124         PACKB(0, 0),    /* 0x003e */
125         PACKB(0, 0),    /* 0x003f */
126         PACKB(0, 0),    /* 0x0040 */
127         PACKB(0, 0),    /* 0x0041 */
128         PACKB(0, 0)     /* 0x0042 */
129 };
130
131 #define MAX_MBOX_COMMAND        ARRAY_SIZE(mbox_param)
132
133 /* queue length's _must_ be power of two: */
134 #define QUEUE_DEPTH(in, out, ql)        ((in - out) & (ql))
135 #define REQ_QUEUE_DEPTH(in, out)        QUEUE_DEPTH(in, out,                 \
136                                                     QLOGICPTI_REQ_QUEUE_LEN)
137 #define RES_QUEUE_DEPTH(in, out)        QUEUE_DEPTH(in, out, RES_QUEUE_LEN)
138
139 static inline void qlogicpti_enable_irqs(struct qlogicpti *qpti)
140 {
141         sbus_writew(SBUS_CTRL_ERIRQ | SBUS_CTRL_GENAB,
142                     qpti->qregs + SBUS_CTRL);
143 }
144
145 static inline void qlogicpti_disable_irqs(struct qlogicpti *qpti)
146 {
147         sbus_writew(0, qpti->qregs + SBUS_CTRL);
148 }
149
150 static inline void set_sbus_cfg1(struct qlogicpti *qpti)
151 {
152         u16 val;
153         u8 bursts = qpti->bursts;
154
155 #if 0   /* It appears that at least PTI cards do not support
156          * 64-byte bursts and that setting the B64 bit actually
157          * is a nop and the chip ends up using the smallest burst
158          * size. -DaveM
159          */
160         if (sbus_can_burst64(qpti->sdev) && (bursts & DMA_BURST64)) {
161                 val = (SBUS_CFG1_BENAB | SBUS_CFG1_B64);
162         } else
163 #endif
164         if (bursts & DMA_BURST32) {
165                 val = (SBUS_CFG1_BENAB | SBUS_CFG1_B32);
166         } else if (bursts & DMA_BURST16) {
167                 val = (SBUS_CFG1_BENAB | SBUS_CFG1_B16);
168         } else if (bursts & DMA_BURST8) {
169                 val = (SBUS_CFG1_BENAB | SBUS_CFG1_B8);
170         } else {
171                 val = 0; /* No sbus bursts for you... */
172         }
173         sbus_writew(val, qpti->qregs + SBUS_CFG1);
174 }
175
176 static int qlogicpti_mbox_command(struct qlogicpti *qpti, u_short param[], int force)
177 {
178         int loop_count;
179         u16 tmp;
180
181         if (mbox_param[param[0]] == 0)
182                 return 1;
183
184         /* Set SBUS semaphore. */
185         tmp = sbus_readw(qpti->qregs + SBUS_SEMAPHORE);
186         tmp |= SBUS_SEMAPHORE_LCK;
187         sbus_writew(tmp, qpti->qregs + SBUS_SEMAPHORE);
188
189         /* Wait for host IRQ bit to clear. */
190         loop_count = DEFAULT_LOOP_COUNT;
191         while (--loop_count && (sbus_readw(qpti->qregs + HCCTRL) & HCCTRL_HIRQ)) {
192                 barrier();
193                 cpu_relax();
194         }
195         if (!loop_count)
196                 printk(KERN_EMERG "qlogicpti: mbox_command loop timeout #1\n");
197
198         /* Write mailbox command registers. */
199         switch (mbox_param[param[0]] >> 4) {
200         case 6: sbus_writew(param[5], qpti->qregs + MBOX5);
201         case 5: sbus_writew(param[4], qpti->qregs + MBOX4);
202         case 4: sbus_writew(param[3], qpti->qregs + MBOX3);
203         case 3: sbus_writew(param[2], qpti->qregs + MBOX2);
204         case 2: sbus_writew(param[1], qpti->qregs + MBOX1);
205         case 1: sbus_writew(param[0], qpti->qregs + MBOX0);
206         }
207
208         /* Clear RISC interrupt. */
209         tmp = sbus_readw(qpti->qregs + HCCTRL);
210         tmp |= HCCTRL_CRIRQ;
211         sbus_writew(tmp, qpti->qregs + HCCTRL);
212
213         /* Clear SBUS semaphore. */
214         sbus_writew(0, qpti->qregs + SBUS_SEMAPHORE);
215
216         /* Set HOST interrupt. */
217         tmp = sbus_readw(qpti->qregs + HCCTRL);
218         tmp |= HCCTRL_SHIRQ;
219         sbus_writew(tmp, qpti->qregs + HCCTRL);
220
221         /* Wait for HOST interrupt clears. */
222         loop_count = DEFAULT_LOOP_COUNT;
223         while (--loop_count &&
224                (sbus_readw(qpti->qregs + HCCTRL) & HCCTRL_CRIRQ))
225                 udelay(20);
226         if (!loop_count)
227                 printk(KERN_EMERG "qlogicpti: mbox_command[%04x] loop timeout #2\n",
228                        param[0]);
229
230         /* Wait for SBUS semaphore to get set. */
231         loop_count = DEFAULT_LOOP_COUNT;
232         while (--loop_count &&
233                !(sbus_readw(qpti->qregs + SBUS_SEMAPHORE) & SBUS_SEMAPHORE_LCK)) {
234                 udelay(20);
235
236                 /* Workaround for some buggy chips. */
237                 if (sbus_readw(qpti->qregs + MBOX0) & 0x4000)
238                         break;
239         }
240         if (!loop_count)
241                 printk(KERN_EMERG "qlogicpti: mbox_command[%04x] loop timeout #3\n",
242                        param[0]);
243
244         /* Wait for MBOX busy condition to go away. */
245         loop_count = DEFAULT_LOOP_COUNT;
246         while (--loop_count && (sbus_readw(qpti->qregs + MBOX0) == 0x04))
247                 udelay(20);
248         if (!loop_count)
249                 printk(KERN_EMERG "qlogicpti: mbox_command[%04x] loop timeout #4\n",
250                        param[0]);
251
252         /* Read back output parameters. */
253         switch (mbox_param[param[0]] & 0xf) {
254         case 6: param[5] = sbus_readw(qpti->qregs + MBOX5);
255         case 5: param[4] = sbus_readw(qpti->qregs + MBOX4);
256         case 4: param[3] = sbus_readw(qpti->qregs + MBOX3);
257         case 3: param[2] = sbus_readw(qpti->qregs + MBOX2);
258         case 2: param[1] = sbus_readw(qpti->qregs + MBOX1);
259         case 1: param[0] = sbus_readw(qpti->qregs + MBOX0);
260         }
261
262         /* Clear RISC interrupt. */
263         tmp = sbus_readw(qpti->qregs + HCCTRL);
264         tmp |= HCCTRL_CRIRQ;
265         sbus_writew(tmp, qpti->qregs + HCCTRL);
266
267         /* Release SBUS semaphore. */
268         tmp = sbus_readw(qpti->qregs + SBUS_SEMAPHORE);
269         tmp &= ~(SBUS_SEMAPHORE_LCK);
270         sbus_writew(tmp, qpti->qregs + SBUS_SEMAPHORE);
271
272         /* We're done. */
273         return 0;
274 }
275
276 static inline void qlogicpti_set_hostdev_defaults(struct qlogicpti *qpti)
277 {
278         int i;
279
280         qpti->host_param.initiator_scsi_id = qpti->scsi_id;
281         qpti->host_param.bus_reset_delay = 3;
282         qpti->host_param.retry_count = 0;
283         qpti->host_param.retry_delay = 5;
284         qpti->host_param.async_data_setup_time = 3;
285         qpti->host_param.req_ack_active_negation = 1;
286         qpti->host_param.data_line_active_negation = 1;
287         qpti->host_param.data_dma_burst_enable = 1;
288         qpti->host_param.command_dma_burst_enable = 1;
289         qpti->host_param.tag_aging = 8;
290         qpti->host_param.selection_timeout = 250;
291         qpti->host_param.max_queue_depth = 256;
292
293         for(i = 0; i < MAX_TARGETS; i++) {
294                 /*
295                  * disconnect, parity, arq, reneg on reset, and, oddly enough
296                  * tags...the midlayer's notion of tagged support has to match
297                  * our device settings, and since we base whether we enable a
298                  * tag on a  per-cmnd basis upon what the midlayer sez, we
299                  * actually enable the capability here.
300                  */
301                 qpti->dev_param[i].device_flags = 0xcd;
302                 qpti->dev_param[i].execution_throttle = 16;
303                 if (qpti->ultra) {
304                         qpti->dev_param[i].synchronous_period = 12;
305                         qpti->dev_param[i].synchronous_offset = 8;
306                 } else {
307                         qpti->dev_param[i].synchronous_period = 25;
308                         qpti->dev_param[i].synchronous_offset = 12;
309                 }
310                 qpti->dev_param[i].device_enable = 1;
311         }
312         /* this is very important to set! */
313         qpti->sbits = 1 << qpti->scsi_id;
314 }
315
316 static int qlogicpti_reset_hardware(struct Scsi_Host *host)
317 {
318         struct qlogicpti *qpti = (struct qlogicpti *) host->hostdata;
319         u_short param[6];
320         unsigned short risc_code_addr;
321         int loop_count, i;
322         unsigned long flags;
323
324         risc_code_addr = 0x1000;        /* all load addresses are at 0x1000 */
325
326         spin_lock_irqsave(host->host_lock, flags);
327
328         sbus_writew(HCCTRL_PAUSE, qpti->qregs + HCCTRL);
329
330         /* Only reset the scsi bus if it is not free. */
331         if (sbus_readw(qpti->qregs + CPU_PCTRL) & CPU_PCTRL_BSY) {
332                 sbus_writew(CPU_ORIDE_RMOD, qpti->qregs + CPU_ORIDE);
333                 sbus_writew(CPU_CMD_BRESET, qpti->qregs + CPU_CMD);
334                 udelay(400);
335         }
336
337         sbus_writew(SBUS_CTRL_RESET, qpti->qregs + SBUS_CTRL);
338         sbus_writew((DMA_CTRL_CCLEAR | DMA_CTRL_CIRQ), qpti->qregs + CMD_DMA_CTRL);
339         sbus_writew((DMA_CTRL_CCLEAR | DMA_CTRL_CIRQ), qpti->qregs + DATA_DMA_CTRL);
340
341         loop_count = DEFAULT_LOOP_COUNT;
342         while (--loop_count && ((sbus_readw(qpti->qregs + MBOX0) & 0xff) == 0x04))
343                 udelay(20);
344         if (!loop_count)
345                 printk(KERN_EMERG "qlogicpti: reset_hardware loop timeout\n");
346
347         sbus_writew(HCCTRL_PAUSE, qpti->qregs + HCCTRL);
348         set_sbus_cfg1(qpti);
349         qlogicpti_enable_irqs(qpti);
350
351         if (sbus_readw(qpti->qregs + RISC_PSR) & RISC_PSR_ULTRA) {
352                 qpti->ultra = 1;
353                 sbus_writew((RISC_MTREG_P0ULTRA | RISC_MTREG_P1ULTRA),
354                             qpti->qregs + RISC_MTREG);
355         } else {
356                 qpti->ultra = 0;
357                 sbus_writew((RISC_MTREG_P0DFLT | RISC_MTREG_P1DFLT),
358                             qpti->qregs + RISC_MTREG);
359         }
360
361         /* reset adapter and per-device default values. */
362         /* do it after finding out whether we're ultra mode capable */
363         qlogicpti_set_hostdev_defaults(qpti);
364
365         /* Release the RISC processor. */
366         sbus_writew(HCCTRL_REL, qpti->qregs + HCCTRL);
367
368         /* Get RISC to start executing the firmware code. */
369         param[0] = MBOX_EXEC_FIRMWARE;
370         param[1] = risc_code_addr;
371         if (qlogicpti_mbox_command(qpti, param, 1)) {
372                 printk(KERN_EMERG "qlogicpti%d: Cannot execute ISP firmware.\n",
373                        qpti->qpti_id);
374                 spin_unlock_irqrestore(host->host_lock, flags);
375                 return 1;
376         }
377
378         /* Set initiator scsi ID. */
379         param[0] = MBOX_SET_INIT_SCSI_ID;
380         param[1] = qpti->host_param.initiator_scsi_id;
381         if (qlogicpti_mbox_command(qpti, param, 1) ||
382            (param[0] != MBOX_COMMAND_COMPLETE)) {
383                 printk(KERN_EMERG "qlogicpti%d: Cannot set initiator SCSI ID.\n",
384                        qpti->qpti_id);
385                 spin_unlock_irqrestore(host->host_lock, flags);
386                 return 1;
387         }
388
389         /* Initialize state of the queues, both hw and sw. */
390         qpti->req_in_ptr = qpti->res_out_ptr = 0;
391
392         param[0] = MBOX_INIT_RES_QUEUE;
393         param[1] = RES_QUEUE_LEN + 1;
394         param[2] = (u_short) (qpti->res_dvma >> 16);
395         param[3] = (u_short) (qpti->res_dvma & 0xffff);
396         param[4] = param[5] = 0;
397         if (qlogicpti_mbox_command(qpti, param, 1)) {
398                 printk(KERN_EMERG "qlogicpti%d: Cannot init response queue.\n",
399                        qpti->qpti_id);
400                 spin_unlock_irqrestore(host->host_lock, flags);
401                 return 1;
402         }
403
404         param[0] = MBOX_INIT_REQ_QUEUE;
405         param[1] = QLOGICPTI_REQ_QUEUE_LEN + 1;
406         param[2] = (u_short) (qpti->req_dvma >> 16);
407         param[3] = (u_short) (qpti->req_dvma & 0xffff);
408         param[4] = param[5] = 0;
409         if (qlogicpti_mbox_command(qpti, param, 1)) {
410                 printk(KERN_EMERG "qlogicpti%d: Cannot init request queue.\n",
411                        qpti->qpti_id);
412                 spin_unlock_irqrestore(host->host_lock, flags);
413                 return 1;
414         }
415
416         param[0] = MBOX_SET_RETRY_COUNT;
417         param[1] = qpti->host_param.retry_count;
418         param[2] = qpti->host_param.retry_delay;
419         qlogicpti_mbox_command(qpti, param, 0);
420
421         param[0] = MBOX_SET_TAG_AGE_LIMIT;
422         param[1] = qpti->host_param.tag_aging;
423         qlogicpti_mbox_command(qpti, param, 0);
424
425         for (i = 0; i < MAX_TARGETS; i++) {
426                 param[0] = MBOX_GET_DEV_QUEUE_PARAMS;
427                 param[1] = (i << 8);
428                 qlogicpti_mbox_command(qpti, param, 0);
429         }
430
431         param[0] = MBOX_GET_FIRMWARE_STATUS;
432         qlogicpti_mbox_command(qpti, param, 0);
433
434         param[0] = MBOX_SET_SELECT_TIMEOUT;
435         param[1] = qpti->host_param.selection_timeout;
436         qlogicpti_mbox_command(qpti, param, 0);
437
438         for (i = 0; i < MAX_TARGETS; i++) {
439                 param[0] = MBOX_SET_TARGET_PARAMS;
440                 param[1] = (i << 8);
441                 param[2] = (qpti->dev_param[i].device_flags << 8);
442                 /*
443                  * Since we're now loading 1.31 f/w, force narrow/async.
444                  */
445                 param[2] |= 0xc0;
446                 param[3] = 0;   /* no offset, we do not have sync mode yet */
447                 qlogicpti_mbox_command(qpti, param, 0);
448         }
449
450         /*
451          * Always (sigh) do an initial bus reset (kicks f/w).
452          */
453         param[0] = MBOX_BUS_RESET;
454         param[1] = qpti->host_param.bus_reset_delay;
455         qlogicpti_mbox_command(qpti, param, 0);
456         qpti->send_marker = 1;
457
458         spin_unlock_irqrestore(host->host_lock, flags);
459         return 0;
460 }
461
462 #define PTI_RESET_LIMIT 400
463
464 static int __devinit qlogicpti_load_firmware(struct qlogicpti *qpti)
465 {
466         struct Scsi_Host *host = qpti->qhost;
467         unsigned short csum = 0;
468         unsigned short param[6];
469         unsigned short *risc_code, risc_code_addr, risc_code_length;
470         unsigned long flags;
471         int i, timeout;
472
473         risc_code = &sbus_risc_code01[0];
474         risc_code_addr = 0x1000;        /* all f/w modules load at 0x1000 */
475         risc_code_length = sbus_risc_code_length01;
476
477         spin_lock_irqsave(host->host_lock, flags);
478
479         /* Verify the checksum twice, one before loading it, and once
480          * afterwards via the mailbox commands.
481          */
482         for (i = 0; i < risc_code_length; i++)
483                 csum += risc_code[i];
484         if (csum) {
485                 spin_unlock_irqrestore(host->host_lock, flags);
486                 printk(KERN_EMERG "qlogicpti%d: Aieee, firmware checksum failed!",
487                        qpti->qpti_id);
488                 return 1;
489         }               
490         sbus_writew(SBUS_CTRL_RESET, qpti->qregs + SBUS_CTRL);
491         sbus_writew((DMA_CTRL_CCLEAR | DMA_CTRL_CIRQ), qpti->qregs + CMD_DMA_CTRL);
492         sbus_writew((DMA_CTRL_CCLEAR | DMA_CTRL_CIRQ), qpti->qregs + DATA_DMA_CTRL);
493         timeout = PTI_RESET_LIMIT;
494         while (--timeout && (sbus_readw(qpti->qregs + SBUS_CTRL) & SBUS_CTRL_RESET))
495                 udelay(20);
496         if (!timeout) {
497                 spin_unlock_irqrestore(host->host_lock, flags);
498                 printk(KERN_EMERG "qlogicpti%d: Cannot reset the ISP.", qpti->qpti_id);
499                 return 1;
500         }
501
502         sbus_writew(HCCTRL_RESET, qpti->qregs + HCCTRL);
503         mdelay(1);
504
505         sbus_writew((SBUS_CTRL_GENAB | SBUS_CTRL_ERIRQ), qpti->qregs + SBUS_CTRL);
506         set_sbus_cfg1(qpti);
507         sbus_writew(0, qpti->qregs + SBUS_SEMAPHORE);
508
509         if (sbus_readw(qpti->qregs + RISC_PSR) & RISC_PSR_ULTRA) {
510                 qpti->ultra = 1;
511                 sbus_writew((RISC_MTREG_P0ULTRA | RISC_MTREG_P1ULTRA),
512                             qpti->qregs + RISC_MTREG);
513         } else {
514                 qpti->ultra = 0;
515                 sbus_writew((RISC_MTREG_P0DFLT | RISC_MTREG_P1DFLT),
516                             qpti->qregs + RISC_MTREG);
517         }
518
519         sbus_writew(HCCTRL_REL, qpti->qregs + HCCTRL);
520
521         /* Pin lines are only stable while RISC is paused. */
522         sbus_writew(HCCTRL_PAUSE, qpti->qregs + HCCTRL);
523         if (sbus_readw(qpti->qregs + CPU_PDIFF) & CPU_PDIFF_MODE)
524                 qpti->differential = 1;
525         else
526                 qpti->differential = 0;
527         sbus_writew(HCCTRL_REL, qpti->qregs + HCCTRL);
528
529         /* This shouldn't be necessary- we've reset things so we should be
530            running from the ROM now.. */
531
532         param[0] = MBOX_STOP_FIRMWARE;
533         param[1] = param[2] = param[3] = param[4] = param[5] = 0;
534         if (qlogicpti_mbox_command(qpti, param, 1)) {
535                 printk(KERN_EMERG "qlogicpti%d: Cannot stop firmware for reload.\n",
536                        qpti->qpti_id);
537                 spin_unlock_irqrestore(host->host_lock, flags);
538                 return 1;
539         }               
540
541         /* Load it up.. */
542         for (i = 0; i < risc_code_length; i++) {
543                 param[0] = MBOX_WRITE_RAM_WORD;
544                 param[1] = risc_code_addr + i;
545                 param[2] = risc_code[i];
546                 if (qlogicpti_mbox_command(qpti, param, 1) ||
547                     param[0] != MBOX_COMMAND_COMPLETE) {
548                         printk("qlogicpti%d: Firmware dload failed, I'm bolixed!\n",
549                                qpti->qpti_id);
550                         spin_unlock_irqrestore(host->host_lock, flags);
551                         return 1;
552                 }
553         }
554
555         /* Reset the ISP again. */
556         sbus_writew(HCCTRL_RESET, qpti->qregs + HCCTRL);
557         mdelay(1);
558
559         qlogicpti_enable_irqs(qpti);
560         sbus_writew(0, qpti->qregs + SBUS_SEMAPHORE);
561         sbus_writew(HCCTRL_REL, qpti->qregs + HCCTRL);
562
563         /* Ask ISP to verify the checksum of the new code. */
564         param[0] = MBOX_VERIFY_CHECKSUM;
565         param[1] = risc_code_addr;
566         if (qlogicpti_mbox_command(qpti, param, 1) ||
567             (param[0] != MBOX_COMMAND_COMPLETE)) {
568                 printk(KERN_EMERG "qlogicpti%d: New firmware csum failure!\n",
569                        qpti->qpti_id);
570                 spin_unlock_irqrestore(host->host_lock, flags);
571                 return 1;
572         }
573
574         /* Start using newly downloaded firmware. */
575         param[0] = MBOX_EXEC_FIRMWARE;
576         param[1] = risc_code_addr;
577         qlogicpti_mbox_command(qpti, param, 1);
578
579         param[0] = MBOX_ABOUT_FIRMWARE;
580         if (qlogicpti_mbox_command(qpti, param, 1) ||
581             (param[0] != MBOX_COMMAND_COMPLETE)) {
582                 printk(KERN_EMERG "qlogicpti%d: AboutFirmware cmd fails.\n",
583                        qpti->qpti_id);
584                 spin_unlock_irqrestore(host->host_lock, flags);
585                 return 1;
586         }
587
588         /* Snag the major and minor revisions from the result. */
589         qpti->fware_majrev = param[1];
590         qpti->fware_minrev = param[2];
591         qpti->fware_micrev = param[3];
592
593         /* Set the clock rate */
594         param[0] = MBOX_SET_CLOCK_RATE;
595         param[1] = qpti->clock;
596         if (qlogicpti_mbox_command(qpti, param, 1) ||
597             (param[0] != MBOX_COMMAND_COMPLETE)) {
598                 printk(KERN_EMERG "qlogicpti%d: could not set clock rate.\n",
599                        qpti->qpti_id);
600                 spin_unlock_irqrestore(host->host_lock, flags);
601                 return 1;
602         }
603
604         if (qpti->is_pti != 0) {
605                 /* Load scsi initiator ID and interrupt level into sbus static ram. */
606                 param[0] = MBOX_WRITE_RAM_WORD;
607                 param[1] = 0xff80;
608                 param[2] = (unsigned short) qpti->scsi_id;
609                 qlogicpti_mbox_command(qpti, param, 1);
610
611                 param[0] = MBOX_WRITE_RAM_WORD;
612                 param[1] = 0xff00;
613                 param[2] = (unsigned short) 3;
614                 qlogicpti_mbox_command(qpti, param, 1);
615         }
616
617         spin_unlock_irqrestore(host->host_lock, flags);
618         return 0;
619 }
620
621 static int qlogicpti_verify_tmon(struct qlogicpti *qpti)
622 {
623         int curstat = sbus_readb(qpti->sreg);
624
625         curstat &= 0xf0;
626         if (!(curstat & SREG_FUSE) && (qpti->swsreg & SREG_FUSE))
627                 printk("qlogicpti%d: Fuse returned to normal state.\n", qpti->qpti_id);
628         if (!(curstat & SREG_TPOWER) && (qpti->swsreg & SREG_TPOWER))
629                 printk("qlogicpti%d: termpwr back to normal state.\n", qpti->qpti_id);
630         if (curstat != qpti->swsreg) {
631                 int error = 0;
632                 if (curstat & SREG_FUSE) {
633                         error++;
634                         printk("qlogicpti%d: Fuse is open!\n", qpti->qpti_id);
635                 }
636                 if (curstat & SREG_TPOWER) {
637                         error++;
638                         printk("qlogicpti%d: termpwr failure\n", qpti->qpti_id);
639                 }
640                 if (qpti->differential &&
641                     (curstat & SREG_DSENSE) != SREG_DSENSE) {
642                         error++;
643                         printk("qlogicpti%d: You have a single ended device on a "
644                                "differential bus!  Please fix!\n", qpti->qpti_id);
645                 }
646                 qpti->swsreg = curstat;
647                 return error;
648         }
649         return 0;
650 }
651
652 static irqreturn_t qpti_intr(int irq, void *dev_id);
653
654 static void __init qpti_chain_add(struct qlogicpti *qpti)
655 {
656         spin_lock_irq(&qptichain_lock);
657         if (qptichain != NULL) {
658                 struct qlogicpti *qlink = qptichain;
659
660                 while(qlink->next)
661                         qlink = qlink->next;
662                 qlink->next = qpti;
663         } else {
664                 qptichain = qpti;
665         }
666         qpti->next = NULL;
667         spin_unlock_irq(&qptichain_lock);
668 }
669
670 static void __init qpti_chain_del(struct qlogicpti *qpti)
671 {
672         spin_lock_irq(&qptichain_lock);
673         if (qptichain == qpti) {
674                 qptichain = qpti->next;
675         } else {
676                 struct qlogicpti *qlink = qptichain;
677                 while(qlink->next != qpti)
678                         qlink = qlink->next;
679                 qlink->next = qpti->next;
680         }
681         qpti->next = NULL;
682         spin_unlock_irq(&qptichain_lock);
683 }
684
685 static int __init qpti_map_regs(struct qlogicpti *qpti)
686 {
687         struct sbus_dev *sdev = qpti->sdev;
688
689         qpti->qregs = sbus_ioremap(&sdev->resource[0], 0,
690                                    sdev->reg_addrs[0].reg_size,
691                                    "PTI Qlogic/ISP");
692         if (!qpti->qregs) {
693                 printk("PTI: Qlogic/ISP registers are unmappable\n");
694                 return -1;
695         }
696         if (qpti->is_pti) {
697                 qpti->sreg = sbus_ioremap(&sdev->resource[0], (16 * 4096),
698                                           sizeof(unsigned char),
699                                           "PTI Qlogic/ISP statreg");
700                 if (!qpti->sreg) {
701                         printk("PTI: Qlogic/ISP status register is unmappable\n");
702                         return -1;
703                 }
704         }
705         return 0;
706 }
707
708 static int __init qpti_register_irq(struct qlogicpti *qpti)
709 {
710         struct sbus_dev *sdev = qpti->sdev;
711
712         qpti->qhost->irq = qpti->irq = sdev->irqs[0];
713
714         /* We used to try various overly-clever things to
715          * reduce the interrupt processing overhead on
716          * sun4c/sun4m when multiple PTI's shared the
717          * same IRQ.  It was too complex and messy to
718          * sanely maintain.
719          */
720         if (request_irq(qpti->irq, qpti_intr,
721                         IRQF_SHARED, "Qlogic/PTI", qpti))
722                 goto fail;
723
724         printk("qpti%d: IRQ %d ", qpti->qpti_id, qpti->irq);
725
726         return 0;
727
728 fail:
729         printk("qpti%d: Cannot acquire irq line\n", qpti->qpti_id);
730         return -1;
731 }
732
733 static void __init qpti_get_scsi_id(struct qlogicpti *qpti)
734 {
735         qpti->scsi_id = prom_getintdefault(qpti->prom_node,
736                                            "initiator-id",
737                                            -1);
738         if (qpti->scsi_id == -1)
739                 qpti->scsi_id = prom_getintdefault(qpti->prom_node,
740                                                    "scsi-initiator-id",
741                                                    -1);
742         if (qpti->scsi_id == -1)
743                 qpti->scsi_id =
744                         prom_getintdefault(qpti->sdev->bus->prom_node,
745                                            "scsi-initiator-id", 7);
746         qpti->qhost->this_id = qpti->scsi_id;
747         qpti->qhost->max_sectors = 64;
748
749         printk("SCSI ID %d ", qpti->scsi_id);
750 }
751
752 static void qpti_get_bursts(struct qlogicpti *qpti)
753 {
754         struct sbus_dev *sdev = qpti->sdev;
755         u8 bursts, bmask;
756
757         bursts = prom_getintdefault(qpti->prom_node, "burst-sizes", 0xff);
758         bmask = prom_getintdefault(sdev->bus->prom_node,
759                                    "burst-sizes", 0xff);
760         if (bmask != 0xff)
761                 bursts &= bmask;
762         if (bursts == 0xff ||
763             (bursts & DMA_BURST16) == 0 ||
764             (bursts & DMA_BURST32) == 0)
765                 bursts = (DMA_BURST32 - 1);
766
767         qpti->bursts = bursts;
768 }
769
770 static void qpti_get_clock(struct qlogicpti *qpti)
771 {
772         unsigned int cfreq;
773
774         /* Check for what the clock input to this card is.
775          * Default to 40Mhz.
776          */
777         cfreq = prom_getintdefault(qpti->prom_node,"clock-frequency",40000000);
778         qpti->clock = (cfreq + 500000)/1000000;
779         if (qpti->clock == 0) /* bullshit */
780                 qpti->clock = 40;
781 }
782
783 /* The request and response queues must each be aligned
784  * on a page boundary.
785  */
786 static int __init qpti_map_queues(struct qlogicpti *qpti)
787 {
788         struct sbus_dev *sdev = qpti->sdev;
789
790 #define QSIZE(entries)  (((entries) + 1) * QUEUE_ENTRY_LEN)
791         qpti->res_cpu = sbus_alloc_consistent(sdev,
792                                               QSIZE(RES_QUEUE_LEN),
793                                               &qpti->res_dvma);
794         if (qpti->res_cpu == NULL ||
795             qpti->res_dvma == 0) {
796                 printk("QPTI: Cannot map response queue.\n");
797                 return -1;
798         }
799
800         qpti->req_cpu = sbus_alloc_consistent(sdev,
801                                               QSIZE(QLOGICPTI_REQ_QUEUE_LEN),
802                                               &qpti->req_dvma);
803         if (qpti->req_cpu == NULL ||
804             qpti->req_dvma == 0) {
805                 sbus_free_consistent(sdev, QSIZE(RES_QUEUE_LEN),
806                                      qpti->res_cpu, qpti->res_dvma);
807                 printk("QPTI: Cannot map request queue.\n");
808                 return -1;
809         }
810         memset(qpti->res_cpu, 0, QSIZE(RES_QUEUE_LEN));
811         memset(qpti->req_cpu, 0, QSIZE(QLOGICPTI_REQ_QUEUE_LEN));
812         return 0;
813 }
814
815 const char *qlogicpti_info(struct Scsi_Host *host)
816 {
817         static char buf[80];
818         struct qlogicpti *qpti = (struct qlogicpti *) host->hostdata;
819
820         sprintf(buf, "PTI Qlogic,ISP SBUS SCSI irq %d regs at %p",
821                 qpti->qhost->irq, qpti->qregs);
822         return buf;
823 }
824
825 /* I am a certified frobtronicist. */
826 static inline void marker_frob(struct Command_Entry *cmd)
827 {
828         struct Marker_Entry *marker = (struct Marker_Entry *) cmd;
829
830         memset(marker, 0, sizeof(struct Marker_Entry));
831         marker->hdr.entry_cnt = 1;
832         marker->hdr.entry_type = ENTRY_MARKER;
833         marker->modifier = SYNC_ALL;
834         marker->rsvd = 0;
835 }
836
837 static inline void cmd_frob(struct Command_Entry *cmd, struct scsi_cmnd *Cmnd,
838                             struct qlogicpti *qpti)
839 {
840         memset(cmd, 0, sizeof(struct Command_Entry));
841         cmd->hdr.entry_cnt = 1;
842         cmd->hdr.entry_type = ENTRY_COMMAND;
843         cmd->target_id = Cmnd->device->id;
844         cmd->target_lun = Cmnd->device->lun;
845         cmd->cdb_length = Cmnd->cmd_len;
846         cmd->control_flags = 0;
847         if (Cmnd->device->tagged_supported) {
848                 if (qpti->cmd_count[Cmnd->device->id] == 0)
849                         qpti->tag_ages[Cmnd->device->id] = jiffies;
850                 if (time_after(jiffies, qpti->tag_ages[Cmnd->device->id] + (5*HZ))) {
851                         cmd->control_flags = CFLAG_ORDERED_TAG;
852                         qpti->tag_ages[Cmnd->device->id] = jiffies;
853                 } else
854                         cmd->control_flags = CFLAG_SIMPLE_TAG;
855         }
856         if ((Cmnd->cmnd[0] == WRITE_6) ||
857             (Cmnd->cmnd[0] == WRITE_10) ||
858             (Cmnd->cmnd[0] == WRITE_12))
859                 cmd->control_flags |= CFLAG_WRITE;
860         else
861                 cmd->control_flags |= CFLAG_READ;
862         cmd->time_out = 30;
863         memcpy(cmd->cdb, Cmnd->cmnd, Cmnd->cmd_len);
864 }
865
866 /* Do it to it baby. */
867 static inline int load_cmd(struct scsi_cmnd *Cmnd, struct Command_Entry *cmd,
868                            struct qlogicpti *qpti, u_int in_ptr, u_int out_ptr)
869 {
870         struct dataseg *ds;
871         struct scatterlist *sg;
872         int i, n;
873
874         if (Cmnd->use_sg) {
875                 int sg_count;
876
877                 sg = (struct scatterlist *) Cmnd->request_buffer;
878                 sg_count = sbus_map_sg(qpti->sdev, sg, Cmnd->use_sg, Cmnd->sc_data_direction);
879
880                 ds = cmd->dataseg;
881                 cmd->segment_cnt = sg_count;
882
883                 /* Fill in first four sg entries: */
884                 n = sg_count;
885                 if (n > 4)
886                         n = 4;
887                 for (i = 0; i < n; i++, sg++) {
888                         ds[i].d_base = sg_dma_address(sg);
889                         ds[i].d_count = sg_dma_len(sg);
890                 }
891                 sg_count -= 4;
892                 while (sg_count > 0) {
893                         struct Continuation_Entry *cont;
894
895                         ++cmd->hdr.entry_cnt;
896                         cont = (struct Continuation_Entry *) &qpti->req_cpu[in_ptr];
897                         in_ptr = NEXT_REQ_PTR(in_ptr);
898                         if (in_ptr == out_ptr)
899                                 return -1;
900
901                         cont->hdr.entry_type = ENTRY_CONTINUATION;
902                         cont->hdr.entry_cnt = 0;
903                         cont->hdr.sys_def_1 = 0;
904                         cont->hdr.flags = 0;
905                         cont->reserved = 0;
906                         ds = cont->dataseg;
907                         n = sg_count;
908                         if (n > 7)
909                                 n = 7;
910                         for (i = 0; i < n; i++, sg++) {
911                                 ds[i].d_base = sg_dma_address(sg);
912                                 ds[i].d_count = sg_dma_len(sg);
913                         }
914                         sg_count -= n;
915                 }
916         } else if (Cmnd->request_bufflen) {
917                 Cmnd->SCp.ptr = (char *)(unsigned long)
918                         sbus_map_single(qpti->sdev,
919                                         Cmnd->request_buffer,
920                                         Cmnd->request_bufflen,
921                                         Cmnd->sc_data_direction);
922
923                 cmd->dataseg[0].d_base = (u32) ((unsigned long)Cmnd->SCp.ptr);
924                 cmd->dataseg[0].d_count = Cmnd->request_bufflen;
925                 cmd->segment_cnt = 1;
926         } else {
927                 cmd->dataseg[0].d_base = 0;
928                 cmd->dataseg[0].d_count = 0;
929                 cmd->segment_cnt = 1; /* Shouldn't this be 0? */
930         }
931
932         /* Committed, record Scsi_Cmd so we can find it later. */
933         cmd->handle = in_ptr;
934         qpti->cmd_slots[in_ptr] = Cmnd;
935
936         qpti->cmd_count[Cmnd->device->id]++;
937         sbus_writew(in_ptr, qpti->qregs + MBOX4);
938         qpti->req_in_ptr = in_ptr;
939
940         return in_ptr;
941 }
942
943 static inline void update_can_queue(struct Scsi_Host *host, u_int in_ptr, u_int out_ptr)
944 {
945         /* Temporary workaround until bug is found and fixed (one bug has been found
946            already, but fixing it makes things even worse) -jj */
947         int num_free = QLOGICPTI_REQ_QUEUE_LEN - REQ_QUEUE_DEPTH(in_ptr, out_ptr) - 64;
948         host->can_queue = host->host_busy + num_free;
949         host->sg_tablesize = QLOGICPTI_MAX_SG(num_free);
950 }
951
952 static unsigned int scsi_rbuf_get(struct scsi_cmnd *cmd, unsigned char **buf_out)
953 {
954         unsigned char *buf;
955         unsigned int buflen;
956
957         if (cmd->use_sg) {
958                 struct scatterlist *sg;
959
960                 sg = (struct scatterlist *) cmd->request_buffer;
961                 buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
962                 buflen = sg->length;
963         } else {
964                 buf = cmd->request_buffer;
965                 buflen = cmd->request_bufflen;
966         }
967
968         *buf_out = buf;
969         return buflen;
970 }
971
972 static void scsi_rbuf_put(struct scsi_cmnd *cmd, unsigned char *buf)
973 {
974         if (cmd->use_sg) {
975                 struct scatterlist *sg;
976
977                 sg = (struct scatterlist *) cmd->request_buffer;
978                 kunmap_atomic(buf - sg->offset, KM_IRQ0);
979         }
980 }
981
982 /*
983  * Until we scan the entire bus with inquiries, go throught this fella...
984  */
985 static void ourdone(struct scsi_cmnd *Cmnd)
986 {
987         struct qlogicpti *qpti = (struct qlogicpti *) Cmnd->device->host->hostdata;
988         int tgt = Cmnd->device->id;
989         void (*done) (struct scsi_cmnd *);
990
991         /* This grot added by DaveM, blame him for ugliness.
992          * The issue is that in the 2.3.x driver we use the
993          * host_scribble portion of the scsi command as a
994          * completion linked list at interrupt service time,
995          * so we have to store the done function pointer elsewhere.
996          */
997         done = (void (*)(struct scsi_cmnd *))
998                 (((unsigned long) Cmnd->SCp.Message)
999 #ifdef __sparc_v9__
1000                  | ((unsigned long) Cmnd->SCp.Status << 32UL)
1001 #endif
1002                  );
1003
1004         if ((qpti->sbits & (1 << tgt)) == 0) {
1005                 int ok = host_byte(Cmnd->result) == DID_OK;
1006                 if (Cmnd->cmnd[0] == 0x12 && ok) {
1007                         unsigned char *iqd;
1008                         unsigned int iqd_len;
1009
1010                         iqd_len = scsi_rbuf_get(Cmnd, &iqd);
1011
1012                         /* tags handled in midlayer */
1013                         /* enable sync mode? */
1014                         if (iqd[7] & 0x10) {
1015                                 qpti->dev_param[tgt].device_flags |= 0x10;
1016                         } else {
1017                                 qpti->dev_param[tgt].synchronous_offset = 0;
1018                                 qpti->dev_param[tgt].synchronous_period = 0;
1019                         }
1020                         /* are we wide capable? */
1021                         if (iqd[7] & 0x20) {
1022                                 qpti->dev_param[tgt].device_flags |= 0x20;
1023                         }
1024
1025                         scsi_rbuf_put(Cmnd, iqd);
1026
1027                         qpti->sbits |= (1 << tgt);
1028                 } else if (!ok) {
1029                         qpti->sbits |= (1 << tgt);
1030                 }
1031         }
1032         done(Cmnd);
1033 }
1034
1035 static int qlogicpti_queuecommand(struct scsi_cmnd *Cmnd, void (*done)(struct scsi_cmnd *));
1036
1037 static int qlogicpti_queuecommand_slow(struct scsi_cmnd *Cmnd,
1038                                        void (*done)(struct scsi_cmnd *))
1039 {
1040         struct qlogicpti *qpti = (struct qlogicpti *) Cmnd->device->host->hostdata;
1041
1042         /*
1043          * done checking this host adapter?
1044          * If not, then rewrite the command
1045          * to finish through ourdone so we
1046          * can peek at Inquiry data results.
1047          */
1048         if (qpti->sbits && qpti->sbits != 0xffff) {
1049                 /* See above about in ourdone this ugliness... */
1050                 Cmnd->SCp.Message = ((unsigned long)done) & 0xffffffff;
1051 #ifdef CONFIG_SPARC64
1052                 Cmnd->SCp.Status = ((unsigned long)done >> 32UL) & 0xffffffff;
1053 #endif
1054                 return qlogicpti_queuecommand(Cmnd, ourdone);
1055         }
1056
1057         /*
1058          * We've peeked at all targets for this bus- time
1059          * to set parameters for devices for real now.
1060          */
1061         if (qpti->sbits == 0xffff) {
1062                 int i;
1063                 for(i = 0; i < MAX_TARGETS; i++) {
1064                         u_short param[6];
1065                         param[0] = MBOX_SET_TARGET_PARAMS;
1066                         param[1] = (i << 8);
1067                         param[2] = (qpti->dev_param[i].device_flags << 8);
1068                         if (qpti->dev_param[i].device_flags & 0x10) {
1069                                 param[3] = (qpti->dev_param[i].synchronous_offset << 8) |
1070                                         qpti->dev_param[i].synchronous_period;
1071                         } else {
1072                                 param[3] = 0;
1073                         }
1074                         (void) qlogicpti_mbox_command(qpti, param, 0);
1075                 }
1076                 /*
1077                  * set to zero so any traverse through ourdone
1078                  * doesn't start the whole process again,
1079                  */
1080                 qpti->sbits = 0;
1081         }
1082
1083         /* check to see if we're done with all adapters... */
1084         for (qpti = qptichain; qpti != NULL; qpti = qpti->next) {
1085                 if (qpti->sbits) {
1086                         break;
1087                 }
1088         }
1089
1090         /*
1091          * if we hit the end of the chain w/o finding adapters still
1092          * capability-configuring, then we're done with all adapters
1093          * and can rock on..
1094          */
1095         if (qpti == NULL)
1096                 Cmnd->device->host->hostt->queuecommand = qlogicpti_queuecommand;
1097
1098         return qlogicpti_queuecommand(Cmnd, done);
1099 }
1100
1101 /*
1102  * The middle SCSI layer ensures that queuecommand never gets invoked
1103  * concurrently with itself or the interrupt handler (though the
1104  * interrupt handler may call this routine as part of
1105  * request-completion handling).
1106  *
1107  * "This code must fly." -davem
1108  */
1109 static int qlogicpti_queuecommand(struct scsi_cmnd *Cmnd, void (*done)(struct scsi_cmnd *))
1110 {
1111         struct Scsi_Host *host = Cmnd->device->host;
1112         struct qlogicpti *qpti = (struct qlogicpti *) host->hostdata;
1113         struct Command_Entry *cmd;
1114         u_int out_ptr;
1115         int in_ptr;
1116
1117         Cmnd->scsi_done = done;
1118
1119         in_ptr = qpti->req_in_ptr;
1120         cmd = (struct Command_Entry *) &qpti->req_cpu[in_ptr];
1121         out_ptr = sbus_readw(qpti->qregs + MBOX4);
1122         in_ptr = NEXT_REQ_PTR(in_ptr);
1123         if (in_ptr == out_ptr)
1124                 goto toss_command;
1125
1126         if (qpti->send_marker) {
1127                 marker_frob(cmd);
1128                 qpti->send_marker = 0;
1129                 if (NEXT_REQ_PTR(in_ptr) == out_ptr) {
1130                         sbus_writew(in_ptr, qpti->qregs + MBOX4);
1131                         qpti->req_in_ptr = in_ptr;
1132                         goto toss_command;
1133                 }
1134                 cmd = (struct Command_Entry *) &qpti->req_cpu[in_ptr];
1135                 in_ptr = NEXT_REQ_PTR(in_ptr);
1136         }
1137         cmd_frob(cmd, Cmnd, qpti);
1138         if ((in_ptr = load_cmd(Cmnd, cmd, qpti, in_ptr, out_ptr)) == -1)
1139                 goto toss_command;
1140
1141         update_can_queue(host, in_ptr, out_ptr);
1142
1143         return 0;
1144
1145 toss_command:
1146         printk(KERN_EMERG "qlogicpti%d: request queue overflow\n",
1147                qpti->qpti_id);
1148
1149         /* Unfortunately, unless you use the new EH code, which
1150          * we don't, the midlayer will ignore the return value,
1151          * which is insane.  We pick up the pieces like this.
1152          */
1153         Cmnd->result = DID_BUS_BUSY;
1154         done(Cmnd);
1155         return 1;
1156 }
1157
1158 static int qlogicpti_return_status(struct Status_Entry *sts, int id)
1159 {
1160         int host_status = DID_ERROR;
1161
1162         switch (sts->completion_status) {
1163               case CS_COMPLETE:
1164                 host_status = DID_OK;
1165                 break;
1166               case CS_INCOMPLETE:
1167                 if (!(sts->state_flags & SF_GOT_BUS))
1168                         host_status = DID_NO_CONNECT;
1169                 else if (!(sts->state_flags & SF_GOT_TARGET))
1170                         host_status = DID_BAD_TARGET;
1171                 else if (!(sts->state_flags & SF_SENT_CDB))
1172                         host_status = DID_ERROR;
1173                 else if (!(sts->state_flags & SF_TRANSFERRED_DATA))
1174                         host_status = DID_ERROR;
1175                 else if (!(sts->state_flags & SF_GOT_STATUS))
1176                         host_status = DID_ERROR;
1177                 else if (!(sts->state_flags & SF_GOT_SENSE))
1178                         host_status = DID_ERROR;
1179                 break;
1180               case CS_DMA_ERROR:
1181               case CS_TRANSPORT_ERROR:
1182                 host_status = DID_ERROR;
1183                 break;
1184               case CS_RESET_OCCURRED:
1185               case CS_BUS_RESET:
1186                 host_status = DID_RESET;
1187                 break;
1188               case CS_ABORTED:
1189                 host_status = DID_ABORT;
1190                 break;
1191               case CS_TIMEOUT:
1192                 host_status = DID_TIME_OUT;
1193                 break;
1194               case CS_DATA_OVERRUN:
1195               case CS_COMMAND_OVERRUN:
1196               case CS_STATUS_OVERRUN:
1197               case CS_BAD_MESSAGE:
1198               case CS_NO_MESSAGE_OUT:
1199               case CS_EXT_ID_FAILED:
1200               case CS_IDE_MSG_FAILED:
1201               case CS_ABORT_MSG_FAILED:
1202               case CS_NOP_MSG_FAILED:
1203               case CS_PARITY_ERROR_MSG_FAILED:
1204               case CS_DEVICE_RESET_MSG_FAILED:
1205               case CS_ID_MSG_FAILED:
1206               case CS_UNEXP_BUS_FREE:
1207                 host_status = DID_ERROR;
1208                 break;
1209               case CS_DATA_UNDERRUN:
1210                 host_status = DID_OK;
1211                 break;
1212               default:
1213                 printk(KERN_EMERG "qpti%d: unknown completion status 0x%04x\n",
1214                        id, sts->completion_status);
1215                 host_status = DID_ERROR;
1216                 break;
1217         }
1218
1219         return (sts->scsi_status & STATUS_MASK) | (host_status << 16);
1220 }
1221
1222 static struct scsi_cmnd *qlogicpti_intr_handler(struct qlogicpti *qpti)
1223 {
1224         struct scsi_cmnd *Cmnd, *done_queue = NULL;
1225         struct Status_Entry *sts;
1226         u_int in_ptr, out_ptr;
1227
1228         if (!(sbus_readw(qpti->qregs + SBUS_STAT) & SBUS_STAT_RINT))
1229                 return NULL;
1230                 
1231         in_ptr = sbus_readw(qpti->qregs + MBOX5);
1232         sbus_writew(HCCTRL_CRIRQ, qpti->qregs + HCCTRL);
1233         if (sbus_readw(qpti->qregs + SBUS_SEMAPHORE) & SBUS_SEMAPHORE_LCK) {
1234                 switch (sbus_readw(qpti->qregs + MBOX0)) {
1235                 case ASYNC_SCSI_BUS_RESET:
1236                 case EXECUTION_TIMEOUT_RESET:
1237                         qpti->send_marker = 1;
1238                         break;
1239                 case INVALID_COMMAND:
1240                 case HOST_INTERFACE_ERROR:
1241                 case COMMAND_ERROR:
1242                 case COMMAND_PARAM_ERROR:
1243                         break;
1244                 };
1245                 sbus_writew(0, qpti->qregs + SBUS_SEMAPHORE);
1246         }
1247
1248         /* This looks like a network driver! */
1249         out_ptr = qpti->res_out_ptr;
1250         while (out_ptr != in_ptr) {
1251                 u_int cmd_slot;
1252
1253                 sts = (struct Status_Entry *) &qpti->res_cpu[out_ptr];
1254                 out_ptr = NEXT_RES_PTR(out_ptr);
1255
1256                 /* We store an index in the handle, not the pointer in
1257                  * some form.  This avoids problems due to the fact
1258                  * that the handle provided is only 32-bits. -DaveM
1259                  */
1260                 cmd_slot = sts->handle;
1261                 Cmnd = qpti->cmd_slots[cmd_slot];
1262                 qpti->cmd_slots[cmd_slot] = NULL;
1263
1264                 if (sts->completion_status == CS_RESET_OCCURRED ||
1265                     sts->completion_status == CS_ABORTED ||
1266                     (sts->status_flags & STF_BUS_RESET))
1267                         qpti->send_marker = 1;
1268
1269                 if (sts->state_flags & SF_GOT_SENSE)
1270                         memcpy(Cmnd->sense_buffer, sts->req_sense_data,
1271                                sizeof(Cmnd->sense_buffer));
1272
1273                 if (sts->hdr.entry_type == ENTRY_STATUS)
1274                         Cmnd->result =
1275                             qlogicpti_return_status(sts, qpti->qpti_id);
1276                 else
1277                         Cmnd->result = DID_ERROR << 16;
1278
1279                 if (Cmnd->use_sg) {
1280                         sbus_unmap_sg(qpti->sdev,
1281                                       (struct scatterlist *)Cmnd->request_buffer,
1282                                       Cmnd->use_sg,
1283                                       Cmnd->sc_data_direction);
1284                 } else if (Cmnd->request_bufflen) {
1285                         sbus_unmap_single(qpti->sdev,
1286                                           (__u32)((unsigned long)Cmnd->SCp.ptr),
1287                                           Cmnd->request_bufflen,
1288                                           Cmnd->sc_data_direction);
1289                 }
1290                 qpti->cmd_count[Cmnd->device->id]--;
1291                 sbus_writew(out_ptr, qpti->qregs + MBOX5);
1292                 Cmnd->host_scribble = (unsigned char *) done_queue;
1293                 done_queue = Cmnd;
1294         }
1295         qpti->res_out_ptr = out_ptr;
1296
1297         return done_queue;
1298 }
1299
1300 static irqreturn_t qpti_intr(int irq, void *dev_id)
1301 {
1302         struct qlogicpti *qpti = dev_id;
1303         unsigned long flags;
1304         struct scsi_cmnd *dq;
1305
1306         spin_lock_irqsave(qpti->qhost->host_lock, flags);
1307         dq = qlogicpti_intr_handler(qpti);
1308
1309         if (dq != NULL) {
1310                 do {
1311                         struct scsi_cmnd *next;
1312
1313                         next = (struct scsi_cmnd *) dq->host_scribble;
1314                         dq->scsi_done(dq);
1315                         dq = next;
1316                 } while (dq != NULL);
1317         }
1318         spin_unlock_irqrestore(qpti->qhost->host_lock, flags);
1319
1320         return IRQ_HANDLED;
1321 }
1322
1323 static int qlogicpti_abort(struct scsi_cmnd *Cmnd)
1324 {
1325         u_short param[6];
1326         struct Scsi_Host *host = Cmnd->device->host;
1327         struct qlogicpti *qpti = (struct qlogicpti *) host->hostdata;
1328         int return_status = SUCCESS;
1329         u32 cmd_cookie;
1330         int i;
1331
1332         printk(KERN_WARNING "qlogicpti : Aborting cmd for tgt[%d] lun[%d]\n",
1333                (int)Cmnd->device->id, (int)Cmnd->device->lun);
1334
1335         qlogicpti_disable_irqs(qpti);
1336
1337         /* Find the 32-bit cookie we gave to the firmware for
1338          * this command.
1339          */
1340         for (i = 0; i < QLOGICPTI_REQ_QUEUE_LEN + 1; i++)
1341                 if (qpti->cmd_slots[i] == Cmnd)
1342                         break;
1343         cmd_cookie = i;
1344
1345         param[0] = MBOX_ABORT;
1346         param[1] = (((u_short) Cmnd->device->id) << 8) | Cmnd->device->lun;
1347         param[2] = cmd_cookie >> 16;
1348         param[3] = cmd_cookie & 0xffff;
1349         if (qlogicpti_mbox_command(qpti, param, 0) ||
1350             (param[0] != MBOX_COMMAND_COMPLETE)) {
1351                 printk(KERN_EMERG "qlogicpti : scsi abort failure: %x\n", param[0]);
1352                 return_status = FAILED;
1353         }
1354
1355         qlogicpti_enable_irqs(qpti);
1356
1357         return return_status;
1358 }
1359
1360 static int qlogicpti_reset(struct scsi_cmnd *Cmnd)
1361 {
1362         u_short param[6];
1363         struct Scsi_Host *host = Cmnd->device->host;
1364         struct qlogicpti *qpti = (struct qlogicpti *) host->hostdata;
1365         int return_status = SUCCESS;
1366
1367         printk(KERN_WARNING "qlogicpti : Resetting SCSI bus!\n");
1368
1369         qlogicpti_disable_irqs(qpti);
1370
1371         param[0] = MBOX_BUS_RESET;
1372         param[1] = qpti->host_param.bus_reset_delay;
1373         if (qlogicpti_mbox_command(qpti, param, 0) ||
1374            (param[0] != MBOX_COMMAND_COMPLETE)) {
1375                 printk(KERN_EMERG "qlogicisp : scsi bus reset failure: %x\n", param[0]);
1376                 return_status = FAILED;
1377         }
1378
1379         qlogicpti_enable_irqs(qpti);
1380
1381         return return_status;
1382 }
1383
1384 static struct scsi_host_template qpti_template = {
1385         .module                 = THIS_MODULE,
1386         .name                   = "qlogicpti",
1387         .info                   = qlogicpti_info,
1388         .queuecommand           = qlogicpti_queuecommand_slow,
1389         .eh_abort_handler       = qlogicpti_abort,
1390         .eh_bus_reset_handler   = qlogicpti_reset,
1391         .can_queue              = QLOGICPTI_REQ_QUEUE_LEN,
1392         .this_id                = 7,
1393         .sg_tablesize           = QLOGICPTI_MAX_SG(QLOGICPTI_REQ_QUEUE_LEN),
1394         .cmd_per_lun            = 1,
1395         .use_clustering         = ENABLE_CLUSTERING,
1396 };
1397
1398 static int __devinit qpti_sbus_probe(struct of_device *dev, const struct of_device_id *match)
1399 {
1400         static int nqptis;
1401         struct sbus_dev *sdev = to_sbus_device(&dev->dev);
1402         struct device_node *dp = dev->node;
1403         struct scsi_host_template *tpnt = match->data;
1404         struct Scsi_Host *host;
1405         struct qlogicpti *qpti;
1406         const char *fcode;
1407
1408         /* Sometimes Antares cards come up not completely
1409          * setup, and we get a report of a zero IRQ.
1410          */
1411         if (sdev->irqs[0] == 0)
1412                 return -ENODEV;
1413
1414         host = scsi_host_alloc(tpnt, sizeof(struct qlogicpti));
1415         if (!host)
1416                 return -ENOMEM;
1417
1418         qpti = (struct qlogicpti *) host->hostdata;
1419
1420         host->max_id = MAX_TARGETS;
1421         qpti->qhost = host;
1422         qpti->sdev = sdev;
1423         qpti->qpti_id = nqptis;
1424         qpti->prom_node = sdev->prom_node;
1425         strcpy(qpti->prom_name, sdev->ofdev.node->name);
1426         qpti->is_pti = strcmp(qpti->prom_name, "QLGC,isp");
1427
1428         if (qpti_map_regs(qpti) < 0)
1429                 goto fail_unlink;
1430
1431         if (qpti_register_irq(qpti) < 0)
1432                 goto fail_unmap_regs;
1433
1434         qpti_get_scsi_id(qpti);
1435         qpti_get_bursts(qpti);
1436         qpti_get_clock(qpti);
1437
1438         /* Clear out scsi_cmnd array. */
1439         memset(qpti->cmd_slots, 0, sizeof(qpti->cmd_slots));
1440
1441         if (qpti_map_queues(qpti) < 0)
1442                 goto fail_free_irq;
1443
1444         /* Load the firmware. */
1445         if (qlogicpti_load_firmware(qpti))
1446                 goto fail_unmap_queues;
1447         if (qpti->is_pti) {
1448                 /* Check the PTI status reg. */
1449                 if (qlogicpti_verify_tmon(qpti))
1450                         goto fail_unmap_queues;
1451         }
1452
1453         /* Reset the ISP and init res/req queues. */
1454         if (qlogicpti_reset_hardware(host))
1455                 goto fail_unmap_queues;
1456
1457         if (scsi_add_host(host, &dev->dev))
1458                 goto fail_unmap_queues;
1459
1460         printk("(Firmware v%d.%d.%d)", qpti->fware_majrev,
1461                qpti->fware_minrev, qpti->fware_micrev);
1462
1463         fcode = of_get_property(dp, "isp-fcode", NULL);
1464         if (fcode && fcode[0])
1465                 printk("(Firmware %s)", fcode);
1466         if (of_find_property(dp, "differential", NULL) != NULL)
1467                 qpti->differential = 1;
1468                         
1469         printk (" [%s Wide, using %s interface]\n",
1470                 (qpti->ultra ? "Ultra" : "Fast"),
1471                 (qpti->differential ? "differential" : "single ended"));
1472
1473         dev_set_drvdata(&sdev->ofdev.dev, qpti);
1474
1475         qpti_chain_add(qpti);
1476
1477         scsi_scan_host(host);
1478         nqptis++;
1479
1480         return 0;
1481
1482 fail_unmap_queues:
1483 #define QSIZE(entries)  (((entries) + 1) * QUEUE_ENTRY_LEN)
1484         sbus_free_consistent(qpti->sdev,
1485                              QSIZE(RES_QUEUE_LEN),
1486                              qpti->res_cpu, qpti->res_dvma);
1487         sbus_free_consistent(qpti->sdev,
1488                              QSIZE(QLOGICPTI_REQ_QUEUE_LEN),
1489                              qpti->req_cpu, qpti->req_dvma);
1490 #undef QSIZE
1491
1492 fail_unmap_regs:
1493         sbus_iounmap(qpti->qregs,
1494                      qpti->sdev->reg_addrs[0].reg_size);
1495         if (qpti->is_pti)
1496                 sbus_iounmap(qpti->sreg, sizeof(unsigned char));
1497
1498 fail_free_irq:
1499         free_irq(qpti->irq, qpti);
1500
1501 fail_unlink:
1502         scsi_host_put(host);
1503
1504         return -ENODEV;
1505 }
1506
1507 static int __devexit qpti_sbus_remove(struct of_device *dev)
1508 {
1509         struct qlogicpti *qpti = dev_get_drvdata(&dev->dev);
1510
1511         qpti_chain_del(qpti);
1512
1513         scsi_remove_host(qpti->qhost);
1514
1515         /* Shut up the card. */
1516         sbus_writew(0, qpti->qregs + SBUS_CTRL);
1517
1518         /* Free IRQ handler and unmap Qlogic,ISP and PTI status regs. */
1519         free_irq(qpti->irq, qpti);
1520
1521 #define QSIZE(entries)  (((entries) + 1) * QUEUE_ENTRY_LEN)
1522         sbus_free_consistent(qpti->sdev,
1523                              QSIZE(RES_QUEUE_LEN),
1524                              qpti->res_cpu, qpti->res_dvma);
1525         sbus_free_consistent(qpti->sdev,
1526                              QSIZE(QLOGICPTI_REQ_QUEUE_LEN),
1527                              qpti->req_cpu, qpti->req_dvma);
1528 #undef QSIZE
1529
1530         sbus_iounmap(qpti->qregs, qpti->sdev->reg_addrs[0].reg_size);
1531         if (qpti->is_pti)
1532                 sbus_iounmap(qpti->sreg, sizeof(unsigned char));
1533
1534         scsi_host_put(qpti->qhost);
1535
1536         return 0;
1537 }
1538
1539 static struct of_device_id qpti_match[] = {
1540         {
1541                 .name = "ptisp",
1542                 .data = &qpti_template,
1543         },
1544         {
1545                 .name = "PTI,ptisp",
1546                 .data = &qpti_template,
1547         },
1548         {
1549                 .name = "QLGC,isp",
1550                 .data = &qpti_template,
1551         },
1552         {
1553                 .name = "SUNW,isp",
1554                 .data = &qpti_template,
1555         },
1556         {},
1557 };
1558 MODULE_DEVICE_TABLE(of, qpti_match);
1559
1560 static struct of_platform_driver qpti_sbus_driver = {
1561         .name           = "qpti",
1562         .match_table    = qpti_match,
1563         .probe          = qpti_sbus_probe,
1564         .remove         = __devexit_p(qpti_sbus_remove),
1565 };
1566
1567 static int __init qpti_init(void)
1568 {
1569         return of_register_driver(&qpti_sbus_driver, &sbus_bus_type);
1570 }
1571
1572 static void __exit qpti_exit(void)
1573 {
1574         of_unregister_driver(&qpti_sbus_driver);
1575 }
1576
1577 MODULE_DESCRIPTION("QlogicISP SBUS driver");
1578 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
1579 MODULE_LICENSE("GPL");
1580 MODULE_VERSION("2.0");
1581
1582 module_init(qpti_init);
1583 module_exit(qpti_exit);