Merge tags 'objtool-urgent-2021-06-28' and 'objtool-core-2021-06-28' of git://git...
[linux-2.6-microblaze.git] / drivers / scsi / mac_scsi.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Generic Macintosh NCR5380 driver
4  *
5  * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
6  *
7  * Copyright 2019 Finn Thain
8  *
9  * derived in part from:
10  */
11 /*
12  * Generic Generic NCR5380 driver
13  *
14  * Copyright 1995, Russell King
15  */
16
17 #include <linux/delay.h>
18 #include <linux/types.h>
19 #include <linux/module.h>
20 #include <linux/ioport.h>
21 #include <linux/init.h>
22 #include <linux/blkdev.h>
23 #include <linux/interrupt.h>
24 #include <linux/platform_device.h>
25
26 #include <asm/hwtest.h>
27 #include <asm/io.h>
28 #include <asm/macintosh.h>
29 #include <asm/macints.h>
30 #include <asm/setup.h>
31
32 #include <scsi/scsi_host.h>
33
34 /* Definitions for the core NCR5380 driver. */
35
36 #define NCR5380_implementation_fields   int pdma_residual
37
38 #define NCR5380_read(reg)           in_8(hostdata->io + ((reg) << 4))
39 #define NCR5380_write(reg, value)   out_8(hostdata->io + ((reg) << 4), value)
40
41 #define NCR5380_dma_xfer_len            macscsi_dma_xfer_len
42 #define NCR5380_dma_recv_setup          macscsi_pread
43 #define NCR5380_dma_send_setup          macscsi_pwrite
44 #define NCR5380_dma_residual            macscsi_dma_residual
45
46 #define NCR5380_intr                    macscsi_intr
47 #define NCR5380_queue_command           macscsi_queue_command
48 #define NCR5380_abort                   macscsi_abort
49 #define NCR5380_host_reset              macscsi_host_reset
50 #define NCR5380_info                    macscsi_info
51
52 #include "NCR5380.h"
53
54 static int setup_can_queue = -1;
55 module_param(setup_can_queue, int, 0);
56 static int setup_cmd_per_lun = -1;
57 module_param(setup_cmd_per_lun, int, 0);
58 static int setup_sg_tablesize = -1;
59 module_param(setup_sg_tablesize, int, 0);
60 static int setup_use_pdma = 512;
61 module_param(setup_use_pdma, int, 0);
62 static int setup_hostid = -1;
63 module_param(setup_hostid, int, 0);
64 static int setup_toshiba_delay = -1;
65 module_param(setup_toshiba_delay, int, 0);
66
67 #ifndef MODULE
68 static int __init mac_scsi_setup(char *str)
69 {
70         int ints[8];
71
72         (void)get_options(str, ARRAY_SIZE(ints), ints);
73
74         if (ints[0] < 1) {
75                 pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>[,<toshiba_delay>]]]]]]\n");
76                 return 0;
77         }
78         if (ints[0] >= 1)
79                 setup_can_queue = ints[1];
80         if (ints[0] >= 2)
81                 setup_cmd_per_lun = ints[2];
82         if (ints[0] >= 3)
83                 setup_sg_tablesize = ints[3];
84         if (ints[0] >= 4)
85                 setup_hostid = ints[4];
86         /* ints[5] (use_tagged_queuing) is ignored */
87         if (ints[0] >= 6)
88                 setup_use_pdma = ints[6];
89         if (ints[0] >= 7)
90                 setup_toshiba_delay = ints[7];
91         return 1;
92 }
93
94 __setup("mac5380=", mac_scsi_setup);
95 #endif /* !MODULE */
96
97 /*
98  * According to "Inside Macintosh: Devices", Mac OS requires disk drivers to
99  * specify the number of bytes between the delays expected from a SCSI target.
100  * This allows the operating system to "prevent bus errors when a target fails
101  * to deliver the next byte within the processor bus error timeout period."
102  * Linux SCSI drivers lack knowledge of the timing behaviour of SCSI targets
103  * so bus errors are unavoidable.
104  *
105  * If a MOVE.B instruction faults, we assume that zero bytes were transferred
106  * and simply retry. That assumption probably depends on target behaviour but
107  * seems to hold up okay. The NOP provides synchronization: without it the
108  * fault can sometimes occur after the program counter has moved past the
109  * offending instruction. Post-increment addressing can't be used.
110  */
111
112 #define MOVE_BYTE(operands) \
113         asm volatile ( \
114                 "1:     moveb " operands "     \n" \
115                 "11:    nop                    \n" \
116                 "       addq #1,%0             \n" \
117                 "       subq #1,%1             \n" \
118                 "40:                           \n" \
119                 "                              \n" \
120                 ".section .fixup,\"ax\"        \n" \
121                 ".even                         \n" \
122                 "90:    movel #1, %2           \n" \
123                 "       jra 40b                \n" \
124                 ".previous                     \n" \
125                 "                              \n" \
126                 ".section __ex_table,\"a\"     \n" \
127                 ".align  4                     \n" \
128                 ".long   1b,90b                \n" \
129                 ".long  11b,90b                \n" \
130                 ".previous                     \n" \
131                 : "+a" (addr), "+r" (n), "+r" (result) : "a" (io))
132
133 /*
134  * If a MOVE.W (or MOVE.L) instruction faults, it cannot be retried because
135  * the residual byte count would be uncertain. In that situation the MOVE_WORD
136  * macro clears n in the fixup section to abort the transfer.
137  */
138
139 #define MOVE_WORD(operands) \
140         asm volatile ( \
141                 "1:     movew " operands "     \n" \
142                 "11:    nop                    \n" \
143                 "       subq #2,%1             \n" \
144                 "40:                           \n" \
145                 "                              \n" \
146                 ".section .fixup,\"ax\"        \n" \
147                 ".even                         \n" \
148                 "90:    movel #0, %1           \n" \
149                 "       movel #2, %2           \n" \
150                 "       jra 40b                \n" \
151                 ".previous                     \n" \
152                 "                              \n" \
153                 ".section __ex_table,\"a\"     \n" \
154                 ".align  4                     \n" \
155                 ".long   1b,90b                \n" \
156                 ".long  11b,90b                \n" \
157                 ".previous                     \n" \
158                 : "+a" (addr), "+r" (n), "+r" (result) : "a" (io))
159
160 #define MOVE_16_WORDS(operands) \
161         asm volatile ( \
162                 "1:     movew " operands "     \n" \
163                 "2:     movew " operands "     \n" \
164                 "3:     movew " operands "     \n" \
165                 "4:     movew " operands "     \n" \
166                 "5:     movew " operands "     \n" \
167                 "6:     movew " operands "     \n" \
168                 "7:     movew " operands "     \n" \
169                 "8:     movew " operands "     \n" \
170                 "9:     movew " operands "     \n" \
171                 "10:    movew " operands "     \n" \
172                 "11:    movew " operands "     \n" \
173                 "12:    movew " operands "     \n" \
174                 "13:    movew " operands "     \n" \
175                 "14:    movew " operands "     \n" \
176                 "15:    movew " operands "     \n" \
177                 "16:    movew " operands "     \n" \
178                 "17:    nop                    \n" \
179                 "       subl  #32,%1           \n" \
180                 "40:                           \n" \
181                 "                              \n" \
182                 ".section .fixup,\"ax\"        \n" \
183                 ".even                         \n" \
184                 "90:    movel #0, %1           \n" \
185                 "       movel #2, %2           \n" \
186                 "       jra 40b                \n" \
187                 ".previous                     \n" \
188                 "                              \n" \
189                 ".section __ex_table,\"a\"     \n" \
190                 ".align  4                     \n" \
191                 ".long   1b,90b                \n" \
192                 ".long   2b,90b                \n" \
193                 ".long   3b,90b                \n" \
194                 ".long   4b,90b                \n" \
195                 ".long   5b,90b                \n" \
196                 ".long   6b,90b                \n" \
197                 ".long   7b,90b                \n" \
198                 ".long   8b,90b                \n" \
199                 ".long   9b,90b                \n" \
200                 ".long  10b,90b                \n" \
201                 ".long  11b,90b                \n" \
202                 ".long  12b,90b                \n" \
203                 ".long  13b,90b                \n" \
204                 ".long  14b,90b                \n" \
205                 ".long  15b,90b                \n" \
206                 ".long  16b,90b                \n" \
207                 ".long  17b,90b                \n" \
208                 ".previous                     \n" \
209                 : "+a" (addr), "+r" (n), "+r" (result) : "a" (io))
210
211 #define MAC_PDMA_DELAY          32
212
213 static inline int mac_pdma_recv(void __iomem *io, unsigned char *start, int n)
214 {
215         unsigned char *addr = start;
216         int result = 0;
217
218         if (n >= 1) {
219                 MOVE_BYTE("%3@,%0@");
220                 if (result)
221                         goto out;
222         }
223         if (n >= 1 && ((unsigned long)addr & 1)) {
224                 MOVE_BYTE("%3@,%0@");
225                 if (result)
226                         goto out;
227         }
228         while (n >= 32)
229                 MOVE_16_WORDS("%3@,%0@+");
230         while (n >= 2)
231                 MOVE_WORD("%3@,%0@+");
232         if (result)
233                 return start - addr; /* Negated to indicate uncertain length */
234         if (n == 1)
235                 MOVE_BYTE("%3@,%0@");
236 out:
237         return addr - start;
238 }
239
240 static inline int mac_pdma_send(unsigned char *start, void __iomem *io, int n)
241 {
242         unsigned char *addr = start;
243         int result = 0;
244
245         if (n >= 1) {
246                 MOVE_BYTE("%0@,%3@");
247                 if (result)
248                         goto out;
249         }
250         if (n >= 1 && ((unsigned long)addr & 1)) {
251                 MOVE_BYTE("%0@,%3@");
252                 if (result)
253                         goto out;
254         }
255         while (n >= 32)
256                 MOVE_16_WORDS("%0@+,%3@");
257         while (n >= 2)
258                 MOVE_WORD("%0@+,%3@");
259         if (result)
260                 return start - addr; /* Negated to indicate uncertain length */
261         if (n == 1)
262                 MOVE_BYTE("%0@,%3@");
263 out:
264         return addr - start;
265 }
266
267 /* The "SCSI DMA" chip on the IIfx implements this register. */
268 #define CTRL_REG                0x8
269 #define CTRL_INTERRUPTS_ENABLE  BIT(1)
270 #define CTRL_HANDSHAKE_MODE     BIT(3)
271
272 static inline void write_ctrl_reg(struct NCR5380_hostdata *hostdata, u32 value)
273 {
274         out_be32(hostdata->io + (CTRL_REG << 4), value);
275 }
276
277 static inline int macscsi_pread(struct NCR5380_hostdata *hostdata,
278                                 unsigned char *dst, int len)
279 {
280         u8 __iomem *s = hostdata->pdma_io + (INPUT_DATA_REG << 4);
281         unsigned char *d = dst;
282         int result = 0;
283
284         hostdata->pdma_residual = len;
285
286         while (!NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG,
287                                       BASR_DRQ | BASR_PHASE_MATCH,
288                                       BASR_DRQ | BASR_PHASE_MATCH, 0)) {
289                 int bytes;
290
291                 if (macintosh_config->ident == MAC_MODEL_IIFX)
292                         write_ctrl_reg(hostdata, CTRL_HANDSHAKE_MODE |
293                                                  CTRL_INTERRUPTS_ENABLE);
294
295                 bytes = mac_pdma_recv(s, d, min(hostdata->pdma_residual, 512));
296
297                 if (bytes > 0) {
298                         d += bytes;
299                         hostdata->pdma_residual -= bytes;
300                 }
301
302                 if (hostdata->pdma_residual == 0)
303                         goto out;
304
305                 if (NCR5380_poll_politely2(hostdata, STATUS_REG, SR_REQ, SR_REQ,
306                                            BUS_AND_STATUS_REG, BASR_ACK,
307                                            BASR_ACK, 0) < 0)
308                         scmd_printk(KERN_DEBUG, hostdata->connected,
309                                     "%s: !REQ and !ACK\n", __func__);
310                 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH))
311                         goto out;
312
313                 if (bytes == 0)
314                         udelay(MAC_PDMA_DELAY);
315
316                 if (bytes >= 0)
317                         continue;
318
319                 dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host,
320                          "%s: bus error (%d/%d)\n", __func__, d - dst, len);
321                 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
322                 result = -1;
323                 goto out;
324         }
325
326         scmd_printk(KERN_ERR, hostdata->connected,
327                     "%s: phase mismatch or !DRQ\n", __func__);
328         NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
329         result = -1;
330 out:
331         if (macintosh_config->ident == MAC_MODEL_IIFX)
332                 write_ctrl_reg(hostdata, CTRL_INTERRUPTS_ENABLE);
333         return result;
334 }
335
336 static inline int macscsi_pwrite(struct NCR5380_hostdata *hostdata,
337                                  unsigned char *src, int len)
338 {
339         unsigned char *s = src;
340         u8 __iomem *d = hostdata->pdma_io + (OUTPUT_DATA_REG << 4);
341         int result = 0;
342
343         hostdata->pdma_residual = len;
344
345         while (!NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG,
346                                       BASR_DRQ | BASR_PHASE_MATCH,
347                                       BASR_DRQ | BASR_PHASE_MATCH, 0)) {
348                 int bytes;
349
350                 if (macintosh_config->ident == MAC_MODEL_IIFX)
351                         write_ctrl_reg(hostdata, CTRL_HANDSHAKE_MODE |
352                                                  CTRL_INTERRUPTS_ENABLE);
353
354                 bytes = mac_pdma_send(s, d, min(hostdata->pdma_residual, 512));
355
356                 if (bytes > 0) {
357                         s += bytes;
358                         hostdata->pdma_residual -= bytes;
359                 }
360
361                 if (hostdata->pdma_residual == 0) {
362                         if (NCR5380_poll_politely(hostdata, TARGET_COMMAND_REG,
363                                                   TCR_LAST_BYTE_SENT,
364                                                   TCR_LAST_BYTE_SENT,
365                                                   0) < 0) {
366                                 scmd_printk(KERN_ERR, hostdata->connected,
367                                             "%s: Last Byte Sent timeout\n", __func__);
368                                 result = -1;
369                         }
370                         goto out;
371                 }
372
373                 if (NCR5380_poll_politely2(hostdata, STATUS_REG, SR_REQ, SR_REQ,
374                                            BUS_AND_STATUS_REG, BASR_ACK,
375                                            BASR_ACK, 0) < 0)
376                         scmd_printk(KERN_DEBUG, hostdata->connected,
377                                     "%s: !REQ and !ACK\n", __func__);
378                 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH))
379                         goto out;
380
381                 if (bytes == 0)
382                         udelay(MAC_PDMA_DELAY);
383
384                 if (bytes >= 0)
385                         continue;
386
387                 dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host,
388                          "%s: bus error (%d/%d)\n", __func__, s - src, len);
389                 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
390                 result = -1;
391                 goto out;
392         }
393
394         scmd_printk(KERN_ERR, hostdata->connected,
395                     "%s: phase mismatch or !DRQ\n", __func__);
396         NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
397         result = -1;
398 out:
399         if (macintosh_config->ident == MAC_MODEL_IIFX)
400                 write_ctrl_reg(hostdata, CTRL_INTERRUPTS_ENABLE);
401         return result;
402 }
403
404 static int macscsi_dma_xfer_len(struct NCR5380_hostdata *hostdata,
405                                 struct scsi_cmnd *cmd)
406 {
407         if (hostdata->flags & FLAG_NO_PSEUDO_DMA ||
408             cmd->SCp.this_residual < setup_use_pdma)
409                 return 0;
410
411         return cmd->SCp.this_residual;
412 }
413
414 static int macscsi_dma_residual(struct NCR5380_hostdata *hostdata)
415 {
416         return hostdata->pdma_residual;
417 }
418
419 #include "NCR5380.c"
420
421 #define DRV_MODULE_NAME         "mac_scsi"
422 #define PFX                     DRV_MODULE_NAME ": "
423
424 static struct scsi_host_template mac_scsi_template = {
425         .module                 = THIS_MODULE,
426         .proc_name              = DRV_MODULE_NAME,
427         .name                   = "Macintosh NCR5380 SCSI",
428         .info                   = macscsi_info,
429         .queuecommand           = macscsi_queue_command,
430         .eh_abort_handler       = macscsi_abort,
431         .eh_host_reset_handler  = macscsi_host_reset,
432         .can_queue              = 16,
433         .this_id                = 7,
434         .sg_tablesize           = 1,
435         .cmd_per_lun            = 2,
436         .dma_boundary           = PAGE_SIZE - 1,
437         .cmd_size               = NCR5380_CMD_SIZE,
438         .max_sectors            = 128,
439 };
440
441 static int __init mac_scsi_probe(struct platform_device *pdev)
442 {
443         struct Scsi_Host *instance;
444         struct NCR5380_hostdata *hostdata;
445         int error;
446         int host_flags = 0;
447         struct resource *irq, *pio_mem, *pdma_mem = NULL;
448
449         pio_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
450         if (!pio_mem)
451                 return -ENODEV;
452
453         pdma_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
454
455         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
456
457         if (!hwreg_present((unsigned char *)pio_mem->start +
458                            (STATUS_REG << 4))) {
459                 pr_info(PFX "no device detected at %pap\n", &pio_mem->start);
460                 return -ENODEV;
461         }
462
463         if (setup_can_queue > 0)
464                 mac_scsi_template.can_queue = setup_can_queue;
465         if (setup_cmd_per_lun > 0)
466                 mac_scsi_template.cmd_per_lun = setup_cmd_per_lun;
467         if (setup_sg_tablesize > 0)
468                 mac_scsi_template.sg_tablesize = setup_sg_tablesize;
469         if (setup_hostid >= 0)
470                 mac_scsi_template.this_id = setup_hostid & 7;
471
472         instance = scsi_host_alloc(&mac_scsi_template,
473                                    sizeof(struct NCR5380_hostdata));
474         if (!instance)
475                 return -ENOMEM;
476
477         if (irq)
478                 instance->irq = irq->start;
479         else
480                 instance->irq = NO_IRQ;
481
482         hostdata = shost_priv(instance);
483         hostdata->base = pio_mem->start;
484         hostdata->io = (u8 __iomem *)pio_mem->start;
485
486         if (pdma_mem && setup_use_pdma)
487                 hostdata->pdma_io = (u8 __iomem *)pdma_mem->start;
488         else
489                 host_flags |= FLAG_NO_PSEUDO_DMA;
490
491         host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0;
492
493         error = NCR5380_init(instance, host_flags | FLAG_LATE_DMA_SETUP);
494         if (error)
495                 goto fail_init;
496
497         if (instance->irq != NO_IRQ) {
498                 error = request_irq(instance->irq, macscsi_intr, IRQF_SHARED,
499                                     "NCR5380", instance);
500                 if (error)
501                         goto fail_irq;
502         }
503
504         NCR5380_maybe_reset_bus(instance);
505
506         error = scsi_add_host(instance, NULL);
507         if (error)
508                 goto fail_host;
509
510         platform_set_drvdata(pdev, instance);
511
512         scsi_scan_host(instance);
513         return 0;
514
515 fail_host:
516         if (instance->irq != NO_IRQ)
517                 free_irq(instance->irq, instance);
518 fail_irq:
519         NCR5380_exit(instance);
520 fail_init:
521         scsi_host_put(instance);
522         return error;
523 }
524
525 static int __exit mac_scsi_remove(struct platform_device *pdev)
526 {
527         struct Scsi_Host *instance = platform_get_drvdata(pdev);
528
529         scsi_remove_host(instance);
530         if (instance->irq != NO_IRQ)
531                 free_irq(instance->irq, instance);
532         NCR5380_exit(instance);
533         scsi_host_put(instance);
534         return 0;
535 }
536
537 static struct platform_driver mac_scsi_driver = {
538         .remove = __exit_p(mac_scsi_remove),
539         .driver = {
540                 .name   = DRV_MODULE_NAME,
541         },
542 };
543
544 module_platform_driver_probe(mac_scsi_driver, mac_scsi_probe);
545
546 MODULE_ALIAS("platform:" DRV_MODULE_NAME);
547 MODULE_LICENSE("GPL");