[SCSI] qlogicpti: fix sg list traversal error in continuation entries
[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%d: mbox_command loop timeout #1\n",
197                        qpti->qpti_id);
198
199         /* Write mailbox command registers. */
200         switch (mbox_param[param[0]] >> 4) {
201         case 6: sbus_writew(param[5], qpti->qregs + MBOX5);
202         case 5: sbus_writew(param[4], qpti->qregs + MBOX4);
203         case 4: sbus_writew(param[3], qpti->qregs + MBOX3);
204         case 3: sbus_writew(param[2], qpti->qregs + MBOX2);
205         case 2: sbus_writew(param[1], qpti->qregs + MBOX1);
206         case 1: sbus_writew(param[0], qpti->qregs + MBOX0);
207         }
208
209         /* Clear RISC interrupt. */
210         tmp = sbus_readw(qpti->qregs + HCCTRL);
211         tmp |= HCCTRL_CRIRQ;
212         sbus_writew(tmp, qpti->qregs + HCCTRL);
213
214         /* Clear SBUS semaphore. */
215         sbus_writew(0, qpti->qregs + SBUS_SEMAPHORE);
216
217         /* Set HOST interrupt. */
218         tmp = sbus_readw(qpti->qregs + HCCTRL);
219         tmp |= HCCTRL_SHIRQ;
220         sbus_writew(tmp, qpti->qregs + HCCTRL);
221
222         /* Wait for HOST interrupt clears. */
223         loop_count = DEFAULT_LOOP_COUNT;
224         while (--loop_count &&
225                (sbus_readw(qpti->qregs + HCCTRL) & HCCTRL_CRIRQ))
226                 udelay(20);
227         if (!loop_count)
228                 printk(KERN_EMERG "qlogicpti%d: mbox_command[%04x] loop timeout #2\n",
229                        qpti->qpti_id, param[0]);
230
231         /* Wait for SBUS semaphore to get set. */
232         loop_count = DEFAULT_LOOP_COUNT;
233         while (--loop_count &&
234                !(sbus_readw(qpti->qregs + SBUS_SEMAPHORE) & SBUS_SEMAPHORE_LCK)) {
235                 udelay(20);
236
237                 /* Workaround for some buggy chips. */
238                 if (sbus_readw(qpti->qregs + MBOX0) & 0x4000)
239                         break;
240         }
241         if (!loop_count)
242                 printk(KERN_EMERG "qlogicpti%d: mbox_command[%04x] loop timeout #3\n",
243                        qpti->qpti_id, param[0]);
244
245         /* Wait for MBOX busy condition to go away. */
246         loop_count = DEFAULT_LOOP_COUNT;
247         while (--loop_count && (sbus_readw(qpti->qregs + MBOX0) == 0x04))
248                 udelay(20);
249         if (!loop_count)
250                 printk(KERN_EMERG "qlogicpti%d: mbox_command[%04x] loop timeout #4\n",
251                        qpti->qpti_id, param[0]);
252
253         /* Read back output parameters. */
254         switch (mbox_param[param[0]] & 0xf) {
255         case 6: param[5] = sbus_readw(qpti->qregs + MBOX5);
256         case 5: param[4] = sbus_readw(qpti->qregs + MBOX4);
257         case 4: param[3] = sbus_readw(qpti->qregs + MBOX3);
258         case 3: param[2] = sbus_readw(qpti->qregs + MBOX2);
259         case 2: param[1] = sbus_readw(qpti->qregs + MBOX1);
260         case 1: param[0] = sbus_readw(qpti->qregs + MBOX0);
261         }
262
263         /* Clear RISC interrupt. */
264         tmp = sbus_readw(qpti->qregs + HCCTRL);
265         tmp |= HCCTRL_CRIRQ;
266         sbus_writew(tmp, qpti->qregs + HCCTRL);
267
268         /* Release SBUS semaphore. */
269         tmp = sbus_readw(qpti->qregs + SBUS_SEMAPHORE);
270         tmp &= ~(SBUS_SEMAPHORE_LCK);
271         sbus_writew(tmp, qpti->qregs + SBUS_SEMAPHORE);
272
273         /* We're done. */
274         return 0;
275 }
276
277 static inline void qlogicpti_set_hostdev_defaults(struct qlogicpti *qpti)
278 {
279         int i;
280
281         qpti->host_param.initiator_scsi_id = qpti->scsi_id;
282         qpti->host_param.bus_reset_delay = 3;
283         qpti->host_param.retry_count = 0;
284         qpti->host_param.retry_delay = 5;
285         qpti->host_param.async_data_setup_time = 3;
286         qpti->host_param.req_ack_active_negation = 1;
287         qpti->host_param.data_line_active_negation = 1;
288         qpti->host_param.data_dma_burst_enable = 1;
289         qpti->host_param.command_dma_burst_enable = 1;
290         qpti->host_param.tag_aging = 8;
291         qpti->host_param.selection_timeout = 250;
292         qpti->host_param.max_queue_depth = 256;
293
294         for(i = 0; i < MAX_TARGETS; i++) {
295                 /*
296                  * disconnect, parity, arq, reneg on reset, and, oddly enough
297                  * tags...the midlayer's notion of tagged support has to match
298                  * our device settings, and since we base whether we enable a
299                  * tag on a  per-cmnd basis upon what the midlayer sez, we
300                  * actually enable the capability here.
301                  */
302                 qpti->dev_param[i].device_flags = 0xcd;
303                 qpti->dev_param[i].execution_throttle = 16;
304                 if (qpti->ultra) {
305                         qpti->dev_param[i].synchronous_period = 12;
306                         qpti->dev_param[i].synchronous_offset = 8;
307                 } else {
308                         qpti->dev_param[i].synchronous_period = 25;
309                         qpti->dev_param[i].synchronous_offset = 12;
310                 }
311                 qpti->dev_param[i].device_enable = 1;
312         }
313 }
314
315 static int qlogicpti_reset_hardware(struct Scsi_Host *host)
316 {
317         struct qlogicpti *qpti = (struct qlogicpti *) host->hostdata;
318         u_short param[6];
319         unsigned short risc_code_addr;
320         int loop_count, i;
321         unsigned long flags;
322
323         risc_code_addr = 0x1000;        /* all load addresses are at 0x1000 */
324
325         spin_lock_irqsave(host->host_lock, flags);
326
327         sbus_writew(HCCTRL_PAUSE, qpti->qregs + HCCTRL);
328
329         /* Only reset the scsi bus if it is not free. */
330         if (sbus_readw(qpti->qregs + CPU_PCTRL) & CPU_PCTRL_BSY) {
331                 sbus_writew(CPU_ORIDE_RMOD, qpti->qregs + CPU_ORIDE);
332                 sbus_writew(CPU_CMD_BRESET, qpti->qregs + CPU_CMD);
333                 udelay(400);
334         }
335
336         sbus_writew(SBUS_CTRL_RESET, qpti->qregs + SBUS_CTRL);
337         sbus_writew((DMA_CTRL_CCLEAR | DMA_CTRL_CIRQ), qpti->qregs + CMD_DMA_CTRL);
338         sbus_writew((DMA_CTRL_CCLEAR | DMA_CTRL_CIRQ), qpti->qregs + DATA_DMA_CTRL);
339
340         loop_count = DEFAULT_LOOP_COUNT;
341         while (--loop_count && ((sbus_readw(qpti->qregs + MBOX0) & 0xff) == 0x04))
342                 udelay(20);
343         if (!loop_count)
344                 printk(KERN_EMERG "qlogicpti%d: reset_hardware loop timeout\n",
345                        qpti->qpti_id);
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 __devinit 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 __devexit 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 __devinit 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 __devinit 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("qlogicpti%d: IRQ %d ", qpti->qpti_id, qpti->irq);
725
726         return 0;
727
728 fail:
729         printk("qlogicpti%d: Cannot acquire irq line\n", qpti->qpti_id);
730         return -1;
731 }
732
733 static void __devinit 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 __devinit 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, *s;
872         int i, n;
873
874         if (scsi_bufflen(Cmnd)) {
875                 int sg_count;
876
877                 sg = scsi_sglist(Cmnd);
878                 sg_count = sbus_map_sg(qpti->sdev, sg, scsi_sg_count(Cmnd),
879                                                       Cmnd->sc_data_direction);
880
881                 ds = cmd->dataseg;
882                 cmd->segment_cnt = sg_count;
883
884                 /* Fill in first four sg entries: */
885                 n = sg_count;
886                 if (n > 4)
887                         n = 4;
888                 for_each_sg(sg, s, n, i) {
889                         ds[i].d_base = sg_dma_address(s);
890                         ds[i].d_count = sg_dma_len(s);
891                 }
892                 sg_count -= 4;
893                 sg = s;
894                 while (sg_count > 0) {
895                         struct Continuation_Entry *cont;
896
897                         ++cmd->hdr.entry_cnt;
898                         cont = (struct Continuation_Entry *) &qpti->req_cpu[in_ptr];
899                         in_ptr = NEXT_REQ_PTR(in_ptr);
900                         if (in_ptr == out_ptr)
901                                 return -1;
902
903                         cont->hdr.entry_type = ENTRY_CONTINUATION;
904                         cont->hdr.entry_cnt = 0;
905                         cont->hdr.sys_def_1 = 0;
906                         cont->hdr.flags = 0;
907                         cont->reserved = 0;
908                         ds = cont->dataseg;
909                         n = sg_count;
910                         if (n > 7)
911                                 n = 7;
912                         for_each_sg(sg, s, n, i) {
913                                 ds[i].d_base = sg_dma_address(s);
914                                 ds[i].d_count = sg_dma_len(s);
915                         }
916                         sg_count -= n;
917                         sg = s;
918                 }
919         } else {
920                 cmd->dataseg[0].d_base = 0;
921                 cmd->dataseg[0].d_count = 0;
922                 cmd->segment_cnt = 1; /* Shouldn't this be 0? */
923         }
924
925         /* Committed, record Scsi_Cmd so we can find it later. */
926         cmd->handle = in_ptr;
927         qpti->cmd_slots[in_ptr] = Cmnd;
928
929         qpti->cmd_count[Cmnd->device->id]++;
930         sbus_writew(in_ptr, qpti->qregs + MBOX4);
931         qpti->req_in_ptr = in_ptr;
932
933         return in_ptr;
934 }
935
936 static inline void update_can_queue(struct Scsi_Host *host, u_int in_ptr, u_int out_ptr)
937 {
938         /* Temporary workaround until bug is found and fixed (one bug has been found
939            already, but fixing it makes things even worse) -jj */
940         int num_free = QLOGICPTI_REQ_QUEUE_LEN - REQ_QUEUE_DEPTH(in_ptr, out_ptr) - 64;
941         host->can_queue = host->host_busy + num_free;
942         host->sg_tablesize = QLOGICPTI_MAX_SG(num_free);
943 }
944
945 static int qlogicpti_slave_configure(struct scsi_device *sdev)
946 {
947         struct qlogicpti *qpti = shost_priv(sdev->host);
948         int tgt = sdev->id;
949         u_short param[6];
950
951         /* tags handled in midlayer */
952         /* enable sync mode? */
953         if (sdev->sdtr) {
954                 qpti->dev_param[tgt].device_flags |= 0x10;
955         } else {
956                 qpti->dev_param[tgt].synchronous_offset = 0;
957                 qpti->dev_param[tgt].synchronous_period = 0;
958         }
959         /* are we wide capable? */
960         if (sdev->wdtr)
961                 qpti->dev_param[tgt].device_flags |= 0x20;
962
963         param[0] = MBOX_SET_TARGET_PARAMS;
964         param[1] = (tgt << 8);
965         param[2] = (qpti->dev_param[tgt].device_flags << 8);
966         if (qpti->dev_param[tgt].device_flags & 0x10) {
967                 param[3] = (qpti->dev_param[tgt].synchronous_offset << 8) |
968                         qpti->dev_param[tgt].synchronous_period;
969         } else {
970                 param[3] = 0;
971         }
972         qlogicpti_mbox_command(qpti, param, 0);
973         return 0;
974 }
975
976 /*
977  * The middle SCSI layer ensures that queuecommand never gets invoked
978  * concurrently with itself or the interrupt handler (though the
979  * interrupt handler may call this routine as part of
980  * request-completion handling).
981  *
982  * "This code must fly." -davem
983  */
984 static int qlogicpti_queuecommand(struct scsi_cmnd *Cmnd, void (*done)(struct scsi_cmnd *))
985 {
986         struct Scsi_Host *host = Cmnd->device->host;
987         struct qlogicpti *qpti = (struct qlogicpti *) host->hostdata;
988         struct Command_Entry *cmd;
989         u_int out_ptr;
990         int in_ptr;
991
992         Cmnd->scsi_done = done;
993
994         in_ptr = qpti->req_in_ptr;
995         cmd = (struct Command_Entry *) &qpti->req_cpu[in_ptr];
996         out_ptr = sbus_readw(qpti->qregs + MBOX4);
997         in_ptr = NEXT_REQ_PTR(in_ptr);
998         if (in_ptr == out_ptr)
999                 goto toss_command;
1000
1001         if (qpti->send_marker) {
1002                 marker_frob(cmd);
1003                 qpti->send_marker = 0;
1004                 if (NEXT_REQ_PTR(in_ptr) == out_ptr) {
1005                         sbus_writew(in_ptr, qpti->qregs + MBOX4);
1006                         qpti->req_in_ptr = in_ptr;
1007                         goto toss_command;
1008                 }
1009                 cmd = (struct Command_Entry *) &qpti->req_cpu[in_ptr];
1010                 in_ptr = NEXT_REQ_PTR(in_ptr);
1011         }
1012         cmd_frob(cmd, Cmnd, qpti);
1013         if ((in_ptr = load_cmd(Cmnd, cmd, qpti, in_ptr, out_ptr)) == -1)
1014                 goto toss_command;
1015
1016         update_can_queue(host, in_ptr, out_ptr);
1017
1018         return 0;
1019
1020 toss_command:
1021         printk(KERN_EMERG "qlogicpti%d: request queue overflow\n",
1022                qpti->qpti_id);
1023
1024         /* Unfortunately, unless you use the new EH code, which
1025          * we don't, the midlayer will ignore the return value,
1026          * which is insane.  We pick up the pieces like this.
1027          */
1028         Cmnd->result = DID_BUS_BUSY;
1029         done(Cmnd);
1030         return 1;
1031 }
1032
1033 static int qlogicpti_return_status(struct Status_Entry *sts, int id)
1034 {
1035         int host_status = DID_ERROR;
1036
1037         switch (sts->completion_status) {
1038               case CS_COMPLETE:
1039                 host_status = DID_OK;
1040                 break;
1041               case CS_INCOMPLETE:
1042                 if (!(sts->state_flags & SF_GOT_BUS))
1043                         host_status = DID_NO_CONNECT;
1044                 else if (!(sts->state_flags & SF_GOT_TARGET))
1045                         host_status = DID_BAD_TARGET;
1046                 else if (!(sts->state_flags & SF_SENT_CDB))
1047                         host_status = DID_ERROR;
1048                 else if (!(sts->state_flags & SF_TRANSFERRED_DATA))
1049                         host_status = DID_ERROR;
1050                 else if (!(sts->state_flags & SF_GOT_STATUS))
1051                         host_status = DID_ERROR;
1052                 else if (!(sts->state_flags & SF_GOT_SENSE))
1053                         host_status = DID_ERROR;
1054                 break;
1055               case CS_DMA_ERROR:
1056               case CS_TRANSPORT_ERROR:
1057                 host_status = DID_ERROR;
1058                 break;
1059               case CS_RESET_OCCURRED:
1060               case CS_BUS_RESET:
1061                 host_status = DID_RESET;
1062                 break;
1063               case CS_ABORTED:
1064                 host_status = DID_ABORT;
1065                 break;
1066               case CS_TIMEOUT:
1067                 host_status = DID_TIME_OUT;
1068                 break;
1069               case CS_DATA_OVERRUN:
1070               case CS_COMMAND_OVERRUN:
1071               case CS_STATUS_OVERRUN:
1072               case CS_BAD_MESSAGE:
1073               case CS_NO_MESSAGE_OUT:
1074               case CS_EXT_ID_FAILED:
1075               case CS_IDE_MSG_FAILED:
1076               case CS_ABORT_MSG_FAILED:
1077               case CS_NOP_MSG_FAILED:
1078               case CS_PARITY_ERROR_MSG_FAILED:
1079               case CS_DEVICE_RESET_MSG_FAILED:
1080               case CS_ID_MSG_FAILED:
1081               case CS_UNEXP_BUS_FREE:
1082                 host_status = DID_ERROR;
1083                 break;
1084               case CS_DATA_UNDERRUN:
1085                 host_status = DID_OK;
1086                 break;
1087               default:
1088                 printk(KERN_EMERG "qlogicpti%d: unknown completion status 0x%04x\n",
1089                        id, sts->completion_status);
1090                 host_status = DID_ERROR;
1091                 break;
1092         }
1093
1094         return (sts->scsi_status & STATUS_MASK) | (host_status << 16);
1095 }
1096
1097 static struct scsi_cmnd *qlogicpti_intr_handler(struct qlogicpti *qpti)
1098 {
1099         struct scsi_cmnd *Cmnd, *done_queue = NULL;
1100         struct Status_Entry *sts;
1101         u_int in_ptr, out_ptr;
1102
1103         if (!(sbus_readw(qpti->qregs + SBUS_STAT) & SBUS_STAT_RINT))
1104                 return NULL;
1105                 
1106         in_ptr = sbus_readw(qpti->qregs + MBOX5);
1107         sbus_writew(HCCTRL_CRIRQ, qpti->qregs + HCCTRL);
1108         if (sbus_readw(qpti->qregs + SBUS_SEMAPHORE) & SBUS_SEMAPHORE_LCK) {
1109                 switch (sbus_readw(qpti->qregs + MBOX0)) {
1110                 case ASYNC_SCSI_BUS_RESET:
1111                 case EXECUTION_TIMEOUT_RESET:
1112                         qpti->send_marker = 1;
1113                         break;
1114                 case INVALID_COMMAND:
1115                 case HOST_INTERFACE_ERROR:
1116                 case COMMAND_ERROR:
1117                 case COMMAND_PARAM_ERROR:
1118                         break;
1119                 };
1120                 sbus_writew(0, qpti->qregs + SBUS_SEMAPHORE);
1121         }
1122
1123         /* This looks like a network driver! */
1124         out_ptr = qpti->res_out_ptr;
1125         while (out_ptr != in_ptr) {
1126                 u_int cmd_slot;
1127
1128                 sts = (struct Status_Entry *) &qpti->res_cpu[out_ptr];
1129                 out_ptr = NEXT_RES_PTR(out_ptr);
1130
1131                 /* We store an index in the handle, not the pointer in
1132                  * some form.  This avoids problems due to the fact
1133                  * that the handle provided is only 32-bits. -DaveM
1134                  */
1135                 cmd_slot = sts->handle;
1136                 Cmnd = qpti->cmd_slots[cmd_slot];
1137                 qpti->cmd_slots[cmd_slot] = NULL;
1138
1139                 if (sts->completion_status == CS_RESET_OCCURRED ||
1140                     sts->completion_status == CS_ABORTED ||
1141                     (sts->status_flags & STF_BUS_RESET))
1142                         qpti->send_marker = 1;
1143
1144                 if (sts->state_flags & SF_GOT_SENSE)
1145                         memcpy(Cmnd->sense_buffer, sts->req_sense_data,
1146                                SCSI_SENSE_BUFFERSIZE);
1147
1148                 if (sts->hdr.entry_type == ENTRY_STATUS)
1149                         Cmnd->result =
1150                             qlogicpti_return_status(sts, qpti->qpti_id);
1151                 else
1152                         Cmnd->result = DID_ERROR << 16;
1153
1154                 if (scsi_bufflen(Cmnd))
1155                         sbus_unmap_sg(qpti->sdev,
1156                                       scsi_sglist(Cmnd), scsi_sg_count(Cmnd),
1157                                       Cmnd->sc_data_direction);
1158
1159                 qpti->cmd_count[Cmnd->device->id]--;
1160                 sbus_writew(out_ptr, qpti->qregs + MBOX5);
1161                 Cmnd->host_scribble = (unsigned char *) done_queue;
1162                 done_queue = Cmnd;
1163         }
1164         qpti->res_out_ptr = out_ptr;
1165
1166         return done_queue;
1167 }
1168
1169 static irqreturn_t qpti_intr(int irq, void *dev_id)
1170 {
1171         struct qlogicpti *qpti = dev_id;
1172         unsigned long flags;
1173         struct scsi_cmnd *dq;
1174
1175         spin_lock_irqsave(qpti->qhost->host_lock, flags);
1176         dq = qlogicpti_intr_handler(qpti);
1177
1178         if (dq != NULL) {
1179                 do {
1180                         struct scsi_cmnd *next;
1181
1182                         next = (struct scsi_cmnd *) dq->host_scribble;
1183                         dq->scsi_done(dq);
1184                         dq = next;
1185                 } while (dq != NULL);
1186         }
1187         spin_unlock_irqrestore(qpti->qhost->host_lock, flags);
1188
1189         return IRQ_HANDLED;
1190 }
1191
1192 static int qlogicpti_abort(struct scsi_cmnd *Cmnd)
1193 {
1194         u_short param[6];
1195         struct Scsi_Host *host = Cmnd->device->host;
1196         struct qlogicpti *qpti = (struct qlogicpti *) host->hostdata;
1197         int return_status = SUCCESS;
1198         u32 cmd_cookie;
1199         int i;
1200
1201         printk(KERN_WARNING "qlogicpti%d: Aborting cmd for tgt[%d] lun[%d]\n",
1202                qpti->qpti_id, (int)Cmnd->device->id, (int)Cmnd->device->lun);
1203
1204         qlogicpti_disable_irqs(qpti);
1205
1206         /* Find the 32-bit cookie we gave to the firmware for
1207          * this command.
1208          */
1209         for (i = 0; i < QLOGICPTI_REQ_QUEUE_LEN + 1; i++)
1210                 if (qpti->cmd_slots[i] == Cmnd)
1211                         break;
1212         cmd_cookie = i;
1213
1214         param[0] = MBOX_ABORT;
1215         param[1] = (((u_short) Cmnd->device->id) << 8) | Cmnd->device->lun;
1216         param[2] = cmd_cookie >> 16;
1217         param[3] = cmd_cookie & 0xffff;
1218         if (qlogicpti_mbox_command(qpti, param, 0) ||
1219             (param[0] != MBOX_COMMAND_COMPLETE)) {
1220                 printk(KERN_EMERG "qlogicpti%d: scsi abort failure: %x\n",
1221                        qpti->qpti_id, param[0]);
1222                 return_status = FAILED;
1223         }
1224
1225         qlogicpti_enable_irqs(qpti);
1226
1227         return return_status;
1228 }
1229
1230 static int qlogicpti_reset(struct scsi_cmnd *Cmnd)
1231 {
1232         u_short param[6];
1233         struct Scsi_Host *host = Cmnd->device->host;
1234         struct qlogicpti *qpti = (struct qlogicpti *) host->hostdata;
1235         int return_status = SUCCESS;
1236
1237         printk(KERN_WARNING "qlogicpti%d: Resetting SCSI bus!\n",
1238                qpti->qpti_id);
1239
1240         qlogicpti_disable_irqs(qpti);
1241
1242         param[0] = MBOX_BUS_RESET;
1243         param[1] = qpti->host_param.bus_reset_delay;
1244         if (qlogicpti_mbox_command(qpti, param, 0) ||
1245            (param[0] != MBOX_COMMAND_COMPLETE)) {
1246                 printk(KERN_EMERG "qlogicisp%d: scsi bus reset failure: %x\n",
1247                        qpti->qpti_id, param[0]);
1248                 return_status = FAILED;
1249         }
1250
1251         qlogicpti_enable_irqs(qpti);
1252
1253         return return_status;
1254 }
1255
1256 static struct scsi_host_template qpti_template = {
1257         .module                 = THIS_MODULE,
1258         .name                   = "qlogicpti",
1259         .info                   = qlogicpti_info,
1260         .queuecommand           = qlogicpti_queuecommand,
1261         .slave_configure        = qlogicpti_slave_configure,
1262         .eh_abort_handler       = qlogicpti_abort,
1263         .eh_bus_reset_handler   = qlogicpti_reset,
1264         .can_queue              = QLOGICPTI_REQ_QUEUE_LEN,
1265         .this_id                = 7,
1266         .sg_tablesize           = QLOGICPTI_MAX_SG(QLOGICPTI_REQ_QUEUE_LEN),
1267         .cmd_per_lun            = 1,
1268         .use_clustering         = ENABLE_CLUSTERING,
1269 };
1270
1271 static int __devinit qpti_sbus_probe(struct of_device *dev, const struct of_device_id *match)
1272 {
1273         static int nqptis;
1274         struct sbus_dev *sdev = to_sbus_device(&dev->dev);
1275         struct device_node *dp = dev->node;
1276         struct scsi_host_template *tpnt = match->data;
1277         struct Scsi_Host *host;
1278         struct qlogicpti *qpti;
1279         const char *fcode;
1280
1281         /* Sometimes Antares cards come up not completely
1282          * setup, and we get a report of a zero IRQ.
1283          */
1284         if (sdev->irqs[0] == 0)
1285                 return -ENODEV;
1286
1287         host = scsi_host_alloc(tpnt, sizeof(struct qlogicpti));
1288         if (!host)
1289                 return -ENOMEM;
1290
1291         qpti = (struct qlogicpti *) host->hostdata;
1292
1293         host->max_id = MAX_TARGETS;
1294         qpti->qhost = host;
1295         qpti->sdev = sdev;
1296         qpti->qpti_id = nqptis;
1297         qpti->prom_node = sdev->prom_node;
1298         strcpy(qpti->prom_name, sdev->ofdev.node->name);
1299         qpti->is_pti = strcmp(qpti->prom_name, "QLGC,isp");
1300
1301         if (qpti_map_regs(qpti) < 0)
1302                 goto fail_unlink;
1303
1304         if (qpti_register_irq(qpti) < 0)
1305                 goto fail_unmap_regs;
1306
1307         qpti_get_scsi_id(qpti);
1308         qpti_get_bursts(qpti);
1309         qpti_get_clock(qpti);
1310
1311         /* Clear out scsi_cmnd array. */
1312         memset(qpti->cmd_slots, 0, sizeof(qpti->cmd_slots));
1313
1314         if (qpti_map_queues(qpti) < 0)
1315                 goto fail_free_irq;
1316
1317         /* Load the firmware. */
1318         if (qlogicpti_load_firmware(qpti))
1319                 goto fail_unmap_queues;
1320         if (qpti->is_pti) {
1321                 /* Check the PTI status reg. */
1322                 if (qlogicpti_verify_tmon(qpti))
1323                         goto fail_unmap_queues;
1324         }
1325
1326         /* Reset the ISP and init res/req queues. */
1327         if (qlogicpti_reset_hardware(host))
1328                 goto fail_unmap_queues;
1329
1330         printk("(Firmware v%d.%d.%d)", qpti->fware_majrev,
1331                qpti->fware_minrev, qpti->fware_micrev);
1332
1333         fcode = of_get_property(dp, "isp-fcode", NULL);
1334         if (fcode && fcode[0])
1335                 printk("(FCode %s)", fcode);
1336         if (of_find_property(dp, "differential", NULL) != NULL)
1337                 qpti->differential = 1;
1338                         
1339         printk("\nqlogicpti%d: [%s Wide, using %s interface]\n",
1340                 qpti->qpti_id,
1341                 (qpti->ultra ? "Ultra" : "Fast"),
1342                 (qpti->differential ? "differential" : "single ended"));
1343
1344         if (scsi_add_host(host, &dev->dev)) {
1345                 printk("qlogicpti%d: Failed scsi_add_host\n", qpti->qpti_id);
1346                 goto fail_unmap_queues;
1347         }
1348
1349         dev_set_drvdata(&sdev->ofdev.dev, qpti);
1350
1351         qpti_chain_add(qpti);
1352
1353         scsi_scan_host(host);
1354         nqptis++;
1355
1356         return 0;
1357
1358 fail_unmap_queues:
1359 #define QSIZE(entries)  (((entries) + 1) * QUEUE_ENTRY_LEN)
1360         sbus_free_consistent(qpti->sdev,
1361                              QSIZE(RES_QUEUE_LEN),
1362                              qpti->res_cpu, qpti->res_dvma);
1363         sbus_free_consistent(qpti->sdev,
1364                              QSIZE(QLOGICPTI_REQ_QUEUE_LEN),
1365                              qpti->req_cpu, qpti->req_dvma);
1366 #undef QSIZE
1367
1368 fail_unmap_regs:
1369         sbus_iounmap(qpti->qregs,
1370                      qpti->sdev->reg_addrs[0].reg_size);
1371         if (qpti->is_pti)
1372                 sbus_iounmap(qpti->sreg, sizeof(unsigned char));
1373
1374 fail_free_irq:
1375         free_irq(qpti->irq, qpti);
1376
1377 fail_unlink:
1378         scsi_host_put(host);
1379
1380         return -ENODEV;
1381 }
1382
1383 static int __devexit qpti_sbus_remove(struct of_device *dev)
1384 {
1385         struct qlogicpti *qpti = dev_get_drvdata(&dev->dev);
1386
1387         qpti_chain_del(qpti);
1388
1389         scsi_remove_host(qpti->qhost);
1390
1391         /* Shut up the card. */
1392         sbus_writew(0, qpti->qregs + SBUS_CTRL);
1393
1394         /* Free IRQ handler and unmap Qlogic,ISP and PTI status regs. */
1395         free_irq(qpti->irq, qpti);
1396
1397 #define QSIZE(entries)  (((entries) + 1) * QUEUE_ENTRY_LEN)
1398         sbus_free_consistent(qpti->sdev,
1399                              QSIZE(RES_QUEUE_LEN),
1400                              qpti->res_cpu, qpti->res_dvma);
1401         sbus_free_consistent(qpti->sdev,
1402                              QSIZE(QLOGICPTI_REQ_QUEUE_LEN),
1403                              qpti->req_cpu, qpti->req_dvma);
1404 #undef QSIZE
1405
1406         sbus_iounmap(qpti->qregs, qpti->sdev->reg_addrs[0].reg_size);
1407         if (qpti->is_pti)
1408                 sbus_iounmap(qpti->sreg, sizeof(unsigned char));
1409
1410         scsi_host_put(qpti->qhost);
1411
1412         return 0;
1413 }
1414
1415 static struct of_device_id qpti_match[] = {
1416         {
1417                 .name = "ptisp",
1418                 .data = &qpti_template,
1419         },
1420         {
1421                 .name = "PTI,ptisp",
1422                 .data = &qpti_template,
1423         },
1424         {
1425                 .name = "QLGC,isp",
1426                 .data = &qpti_template,
1427         },
1428         {
1429                 .name = "SUNW,isp",
1430                 .data = &qpti_template,
1431         },
1432         {},
1433 };
1434 MODULE_DEVICE_TABLE(of, qpti_match);
1435
1436 static struct of_platform_driver qpti_sbus_driver = {
1437         .name           = "qpti",
1438         .match_table    = qpti_match,
1439         .probe          = qpti_sbus_probe,
1440         .remove         = __devexit_p(qpti_sbus_remove),
1441 };
1442
1443 static int __init qpti_init(void)
1444 {
1445         return of_register_driver(&qpti_sbus_driver, &sbus_bus_type);
1446 }
1447
1448 static void __exit qpti_exit(void)
1449 {
1450         of_unregister_driver(&qpti_sbus_driver);
1451 }
1452
1453 MODULE_DESCRIPTION("QlogicISP SBUS driver");
1454 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
1455 MODULE_LICENSE("GPL");
1456 MODULE_VERSION("2.0");
1457
1458 module_init(qpti_init);
1459 module_exit(qpti_exit);