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Linux 4.9.243
[linux/fpc-iii.git] / drivers / scsi / mac_esp.c
blob1002124bd8bf4cb7cc8359d47bfaf1a92173ba28
1 /* mac_esp.c: ESP front-end for Macintosh Quadra systems.
2 *
3 * Adapted from jazz_esp.c and the old mac_esp.c.
4 *
5 * The pseudo DMA algorithm is based on the one used in NetBSD.
6 * See sys/arch/mac68k/obio/esp.c for some background information.
7 *
8 * Copyright (C) 2007-2008 Finn Thain
9 */
10
11 #include <linux/kernel.h>
12 #include <linux/types.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/platform_device.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/scatterlist.h>
19 #include <linux/delay.h>
20 #include <linux/io.h>
21 #include <linux/nubus.h>
22 #include <linux/slab.h>
23
24 #include <asm/irq.h>
25 #include <asm/dma.h>
26 #include <asm/macints.h>
27 #include <asm/macintosh.h>
28 #include <asm/mac_via.h>
29
30 #include <scsi/scsi_host.h>
31
32 #include "esp_scsi.h"
33
34 #define DRV_MODULE_NAME "mac_esp"
35 #define PFX DRV_MODULE_NAME ": "
36 #define DRV_VERSION "1.000"
37 #define DRV_MODULE_RELDATE "Sept 15, 2007"
38
39 #define MAC_ESP_IO_BASE 0x50F00000
40 #define MAC_ESP_REGS_QUADRA (MAC_ESP_IO_BASE + 0x10000)
41 #define MAC_ESP_REGS_QUADRA2 (MAC_ESP_IO_BASE + 0xF000)
42 #define MAC_ESP_REGS_QUADRA3 (MAC_ESP_IO_BASE + 0x18000)
43 #define MAC_ESP_REGS_SPACING 0x402
44 #define MAC_ESP_PDMA_REG 0xF9800024
45 #define MAC_ESP_PDMA_REG_SPACING 0x4
46 #define MAC_ESP_PDMA_IO_OFFSET 0x100
47
48 #define esp_read8(REG) mac_esp_read8(esp, REG)
49 #define esp_write8(VAL, REG) mac_esp_write8(esp, VAL, REG)
50
51 struct mac_esp_priv {
52 struct esp *esp;
53 void __iomem *pdma_regs;
54 void __iomem *pdma_io;
55 int error;
56 };
57 static struct esp *esp_chips[2];
58 static DEFINE_SPINLOCK(esp_chips_lock);
59
60 #define MAC_ESP_GET_PRIV(esp) ((struct mac_esp_priv *) \
61 platform_get_drvdata((struct platform_device *) \
62 (esp->dev)))
63
64 static inline void mac_esp_write8(struct esp *esp, u8 val, unsigned long reg)
65 {
66 nubus_writeb(val, esp->regs + reg * 16);
67 }
68
69 static inline u8 mac_esp_read8(struct esp *esp, unsigned long reg)
70 {
71 return nubus_readb(esp->regs + reg * 16);
72 }
73
74 /* For pseudo DMA and PIO we need the virtual address
75 * so this address mapping is the identity mapping.
76 */
77
78 static dma_addr_t mac_esp_map_single(struct esp *esp, void *buf,
79 size_t sz, int dir)
80 {
81 return (dma_addr_t)buf;
82 }
83
84 static int mac_esp_map_sg(struct esp *esp, struct scatterlist *sg,
85 int num_sg, int dir)
86 {
87 int i;
88
89 for (i = 0; i < num_sg; i++)
90 sg[i].dma_address = (u32)sg_virt(&sg[i]);
91 return num_sg;
92 }
93
94 static void mac_esp_unmap_single(struct esp *esp, dma_addr_t addr,
95 size_t sz, int dir)
96 {
97 /* Nothing to do. */
98 }
99
100 static void mac_esp_unmap_sg(struct esp *esp, struct scatterlist *sg,
101 int num_sg, int dir)
102 {
103 /* Nothing to do. */
104 }
105
106 static void mac_esp_reset_dma(struct esp *esp)
107 {
108 /* Nothing to do. */
109 }
110
111 static void mac_esp_dma_drain(struct esp *esp)
112 {
113 /* Nothing to do. */
114 }
115
116 static void mac_esp_dma_invalidate(struct esp *esp)
117 {
118 /* Nothing to do. */
119 }
120
121 static int mac_esp_dma_error(struct esp *esp)
122 {
123 return MAC_ESP_GET_PRIV(esp)->error;
124 }
125
126 static inline int mac_esp_wait_for_empty_fifo(struct esp *esp)
127 {
128 struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp);
129 int i = 500000;
130
131 do {
132 if (!(esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES))
133 return 0;
134
135 if (esp_read8(ESP_STATUS) & ESP_STAT_INTR)
136 return 1;
137
138 udelay(2);
139 } while (--i);
140
141 printk(KERN_ERR PFX "FIFO is not empty (sreg %02x)\n",
142 esp_read8(ESP_STATUS));
143 mep->error = 1;
144 return 1;
145 }
146
147 static inline int mac_esp_wait_for_dreq(struct esp *esp)
148 {
149 struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp);
150 int i = 500000;
151
152 do {
153 if (mep->pdma_regs == NULL) {
154 if (via2_scsi_drq_pending())
155 return 0;
156 } else {
157 if (nubus_readl(mep->pdma_regs) & 0x200)
158 return 0;
159 }
160
161 if (esp_read8(ESP_STATUS) & ESP_STAT_INTR)
162 return 1;
163
164 udelay(2);
165 } while (--i);
166
167 printk(KERN_ERR PFX "PDMA timeout (sreg %02x)\n",
168 esp_read8(ESP_STATUS));
169 mep->error = 1;
170 return 1;
171 }
172
173 #define MAC_ESP_PDMA_LOOP(operands) \
174 asm volatile ( \
175 " tstw %1 \n" \
176 " jbeq 20f \n" \
177 "1: movew " operands " \n" \
178 "2: movew " operands " \n" \
179 "3: movew " operands " \n" \
180 "4: movew " operands " \n" \
181 "5: movew " operands " \n" \
182 "6: movew " operands " \n" \
183 "7: movew " operands " \n" \
184 "8: movew " operands " \n" \
185 "9: movew " operands " \n" \
186 "10: movew " operands " \n" \
187 "11: movew " operands " \n" \
188 "12: movew " operands " \n" \
189 "13: movew " operands " \n" \
190 "14: movew " operands " \n" \
191 "15: movew " operands " \n" \
192 "16: movew " operands " \n" \
193 " subqw #1,%1 \n" \
194 " jbne 1b \n" \
195 "20: tstw %2 \n" \
196 " jbeq 30f \n" \
197 "21: movew " operands " \n" \
198 " subqw #1,%2 \n" \
199 " jbne 21b \n" \
200 "30: tstw %3 \n" \
201 " jbeq 40f \n" \
202 "31: moveb " operands " \n" \
203 "32: nop \n" \
204 "40: \n" \
205 " \n" \
206 " .section __ex_table,\"a\" \n" \
207 " .align 4 \n" \
208 " .long 1b,40b \n" \
209 " .long 2b,40b \n" \
210 " .long 3b,40b \n" \
211 " .long 4b,40b \n" \
212 " .long 5b,40b \n" \
213 " .long 6b,40b \n" \
214 " .long 7b,40b \n" \
215 " .long 8b,40b \n" \
216 " .long 9b,40b \n" \
217 " .long 10b,40b \n" \
218 " .long 11b,40b \n" \
219 " .long 12b,40b \n" \
220 " .long 13b,40b \n" \
221 " .long 14b,40b \n" \
222 " .long 15b,40b \n" \
223 " .long 16b,40b \n" \
224 " .long 21b,40b \n" \
225 " .long 31b,40b \n" \
226 " .long 32b,40b \n" \
227 " .previous \n" \
228 : "+a" (addr), "+r" (count32), "+r" (count2) \
229 : "g" (count1), "a" (mep->pdma_io))
230
231 static void mac_esp_send_pdma_cmd(struct esp *esp, u32 addr, u32 esp_count,
232 u32 dma_count, int write, u8 cmd)
233 {
234 struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp);
235
236 mep->error = 0;
237
238 if (!write)
239 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
240
241 esp_write8((esp_count >> 0) & 0xFF, ESP_TCLOW);
242 esp_write8((esp_count >> 8) & 0xFF, ESP_TCMED);
243
244 scsi_esp_cmd(esp, cmd);
245
246 do {
247 unsigned int count32 = esp_count >> 5;
248 unsigned int count2 = (esp_count & 0x1F) >> 1;
249 unsigned int count1 = esp_count & 1;
250 unsigned int start_addr = addr;
251
252 if (mac_esp_wait_for_dreq(esp))
253 break;
254
255 if (write) {
256 MAC_ESP_PDMA_LOOP("%4@,%0@+");
257
258 esp_count -= addr - start_addr;
259 } else {
260 unsigned int n;
261
262 MAC_ESP_PDMA_LOOP("%0@+,%4@");
263
264 if (mac_esp_wait_for_empty_fifo(esp))
265 break;
266
267 n = (esp_read8(ESP_TCMED) << 8) + esp_read8(ESP_TCLOW);
268 addr = start_addr + esp_count - n;
269 esp_count = n;
270 }
271 } while (esp_count);
272 }
273
274 /*
275 * Programmed IO routines follow.
276 */
277
278 static inline unsigned int mac_esp_wait_for_fifo(struct esp *esp)
279 {
280 int i = 500000;
281
282 do {
283 unsigned int fbytes = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES;
284
285 if (fbytes)
286 return fbytes;
287
288 udelay(2);
289 } while (--i);
290
291 printk(KERN_ERR PFX "FIFO is empty (sreg %02x)\n",
292 esp_read8(ESP_STATUS));
293 return 0;
294 }
295
296 static inline int mac_esp_wait_for_intr(struct esp *esp)
297 {
298 struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp);
299 int i = 500000;
300
301 do {
302 esp->sreg = esp_read8(ESP_STATUS);
303 if (esp->sreg & ESP_STAT_INTR)
304 return 0;
305
306 udelay(2);
307 } while (--i);
308
309 printk(KERN_ERR PFX "IRQ timeout (sreg %02x)\n", esp->sreg);
310 mep->error = 1;
311 return 1;
312 }
313
314 #define MAC_ESP_PIO_LOOP(operands, reg1) \
315 asm volatile ( \
316 "1: moveb " operands " \n" \
317 " subqw #1,%1 \n" \
318 " jbne 1b \n" \
319 : "+a" (addr), "+r" (reg1) \
320 : "a" (fifo))
321
322 #define MAC_ESP_PIO_FILL(operands, reg1) \
323 asm volatile ( \
324 " moveb " operands " \n" \
325 " moveb " operands " \n" \
326 " moveb " operands " \n" \
327 " moveb " operands " \n" \
328 " moveb " operands " \n" \
329 " moveb " operands " \n" \
330 " moveb " operands " \n" \
331 " moveb " operands " \n" \
332 " moveb " operands " \n" \
333 " moveb " operands " \n" \
334 " moveb " operands " \n" \
335 " moveb " operands " \n" \
336 " moveb " operands " \n" \
337 " moveb " operands " \n" \
338 " moveb " operands " \n" \
339 " moveb " operands " \n" \
340 " subqw #8,%1 \n" \
341 " subqw #8,%1 \n" \
342 : "+a" (addr), "+r" (reg1) \
343 : "a" (fifo))
344
345 #define MAC_ESP_FIFO_SIZE 16
346
347 static void mac_esp_send_pio_cmd(struct esp *esp, u32 addr, u32 esp_count,
348 u32 dma_count, int write, u8 cmd)
349 {
350 struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp);
351 u8 *fifo = esp->regs + ESP_FDATA * 16;
352
353 cmd &= ~ESP_CMD_DMA;
354 mep->error = 0;
355
356 if (write) {
357 scsi_esp_cmd(esp, cmd);
358
359 while (1) {
360 unsigned int n;
361
362 n = mac_esp_wait_for_fifo(esp);
363 if (!n)
364 break;
365
366 if (n > esp_count)
367 n = esp_count;
368 esp_count -= n;
369
370 MAC_ESP_PIO_LOOP("%2@,%0@+", n);
371
372 if (!esp_count)
373 break;
374
375 if (mac_esp_wait_for_intr(esp))
376 break;
377
378 if (((esp->sreg & ESP_STAT_PMASK) != ESP_DIP) &&
379 ((esp->sreg & ESP_STAT_PMASK) != ESP_MIP))
380 break;
381
382 esp->ireg = esp_read8(ESP_INTRPT);
383 if ((esp->ireg & (ESP_INTR_DC | ESP_INTR_BSERV)) !=
384 ESP_INTR_BSERV)
385 break;
386
387 scsi_esp_cmd(esp, ESP_CMD_TI);
388 }
389 } else {
390 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
391
392 if (esp_count >= MAC_ESP_FIFO_SIZE)
393 MAC_ESP_PIO_FILL("%0@+,%2@", esp_count);
394 else
395 MAC_ESP_PIO_LOOP("%0@+,%2@", esp_count);
396
397 scsi_esp_cmd(esp, cmd);
398
399 while (esp_count) {
400 unsigned int n;
401
402 if (mac_esp_wait_for_intr(esp))
403 break;
404
405 if (((esp->sreg & ESP_STAT_PMASK) != ESP_DOP) &&
406 ((esp->sreg & ESP_STAT_PMASK) != ESP_MOP))
407 break;
408
409 esp->ireg = esp_read8(ESP_INTRPT);
410 if ((esp->ireg & (ESP_INTR_DC | ESP_INTR_BSERV)) !=
411 ESP_INTR_BSERV)
412 break;
413
414 n = MAC_ESP_FIFO_SIZE -
415 (esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES);
416 if (n > esp_count)
417 n = esp_count;
418
419 if (n == MAC_ESP_FIFO_SIZE) {
420 MAC_ESP_PIO_FILL("%0@+,%2@", esp_count);
421 } else {
422 esp_count -= n;
423 MAC_ESP_PIO_LOOP("%0@+,%2@", n);
424 }
425
426 scsi_esp_cmd(esp, ESP_CMD_TI);
427 }
428 }
429
430 esp->send_cmd_residual = esp_count;
431 }
432
433 static int mac_esp_irq_pending(struct esp *esp)
434 {
435 if (esp_read8(ESP_STATUS) & ESP_STAT_INTR)
436 return 1;
437 return 0;
438 }
439
440 static u32 mac_esp_dma_length_limit(struct esp *esp, u32 dma_addr, u32 dma_len)
441 {
442 return dma_len > 0xFFFF ? 0xFFFF : dma_len;
443 }
444
445 static irqreturn_t mac_scsi_esp_intr(int irq, void *dev_id)
446 {
447 int got_intr;
448
449 /*
450 * This is an edge triggered IRQ, so we have to be careful to
451 * avoid missing a transition when it is shared by two ESP devices.
452 */
453
454 do {
455 got_intr = 0;
456 if (esp_chips[0] &&
457 (mac_esp_read8(esp_chips[0], ESP_STATUS) & ESP_STAT_INTR)) {
458 (void)scsi_esp_intr(irq, esp_chips[0]);
459 got_intr = 1;
460 }
461 if (esp_chips[1] &&
462 (mac_esp_read8(esp_chips[1], ESP_STATUS) & ESP_STAT_INTR)) {
463 (void)scsi_esp_intr(irq, esp_chips[1]);
464 got_intr = 1;
465 }
466 } while (got_intr);
467
468 return IRQ_HANDLED;
469 }
470
471 static struct esp_driver_ops mac_esp_ops = {
472 .esp_write8 = mac_esp_write8,
473 .esp_read8 = mac_esp_read8,
474 .map_single = mac_esp_map_single,
475 .map_sg = mac_esp_map_sg,
476 .unmap_single = mac_esp_unmap_single,
477 .unmap_sg = mac_esp_unmap_sg,
478 .irq_pending = mac_esp_irq_pending,
479 .dma_length_limit = mac_esp_dma_length_limit,
480 .reset_dma = mac_esp_reset_dma,
481 .dma_drain = mac_esp_dma_drain,
482 .dma_invalidate = mac_esp_dma_invalidate,
483 .send_dma_cmd = mac_esp_send_pdma_cmd,
484 .dma_error = mac_esp_dma_error,
485 };
486
487 static int esp_mac_probe(struct platform_device *dev)
488 {
489 struct scsi_host_template *tpnt = &scsi_esp_template;
490 struct Scsi_Host *host;
491 struct esp *esp;
492 int err;
493 struct mac_esp_priv *mep;
494
495 if (!MACH_IS_MAC)
496 return -ENODEV;
497
498 if (dev->id > 1)
499 return -ENODEV;
500
501 host = scsi_host_alloc(tpnt, sizeof(struct esp));
502
503 err = -ENOMEM;
504 if (!host)
505 goto fail;
506
507 host->max_id = 8;
508 host->use_clustering = DISABLE_CLUSTERING;
509 esp = shost_priv(host);
510
511 esp->host = host;
512 esp->dev = dev;
513
514 esp->command_block = kzalloc(16, GFP_KERNEL);
515 if (!esp->command_block)
516 goto fail_unlink;
517 esp->command_block_dma = (dma_addr_t)esp->command_block;
518
519 esp->scsi_id = 7;
520 host->this_id = esp->scsi_id;
521 esp->scsi_id_mask = 1 << esp->scsi_id;
522
523 mep = kzalloc(sizeof(struct mac_esp_priv), GFP_KERNEL);
524 if (!mep)
525 goto fail_free_command_block;
526 mep->esp = esp;
527 platform_set_drvdata(dev, mep);
528
529 switch (macintosh_config->scsi_type) {
530 case MAC_SCSI_QUADRA:
531 esp->cfreq = 16500000;
532 esp->regs = (void __iomem *)MAC_ESP_REGS_QUADRA;
533 mep->pdma_io = esp->regs + MAC_ESP_PDMA_IO_OFFSET;
534 mep->pdma_regs = NULL;
535 break;
536 case MAC_SCSI_QUADRA2:
537 esp->cfreq = 25000000;
538 esp->regs = (void __iomem *)(MAC_ESP_REGS_QUADRA2 +
539 dev->id * MAC_ESP_REGS_SPACING);
540 mep->pdma_io = esp->regs + MAC_ESP_PDMA_IO_OFFSET;
541 mep->pdma_regs = (void __iomem *)(MAC_ESP_PDMA_REG +
542 dev->id * MAC_ESP_PDMA_REG_SPACING);
543 nubus_writel(0x1d1, mep->pdma_regs);
544 break;
545 case MAC_SCSI_QUADRA3:
546 /* These quadras have a real DMA controller (the PSC) but we
547 * don't know how to drive it so we must use PIO instead.
548 */
549 esp->cfreq = 25000000;
550 esp->regs = (void __iomem *)MAC_ESP_REGS_QUADRA3;
551 mep->pdma_io = NULL;
552 mep->pdma_regs = NULL;
553 break;
554 }
555
556 esp->ops = &mac_esp_ops;
557 if (mep->pdma_io == NULL) {
558 printk(KERN_INFO PFX "using PIO for controller %d\n", dev->id);
559 esp_write8(0, ESP_TCLOW);
560 esp_write8(0, ESP_TCMED);
561 esp->flags = ESP_FLAG_DISABLE_SYNC;
562 mac_esp_ops.send_dma_cmd = mac_esp_send_pio_cmd;
563 } else {
564 printk(KERN_INFO PFX "using PDMA for controller %d\n", dev->id);
565 }
566
567 host->irq = IRQ_MAC_SCSI;
568
569 /* The request_irq() call is intended to succeed for the first device
570 * and fail for the second device.
571 */
572 err = request_irq(host->irq, mac_scsi_esp_intr, 0, "ESP", NULL);
573 spin_lock(&esp_chips_lock);
574 if (err < 0 && esp_chips[!dev->id] == NULL) {
575 spin_unlock(&esp_chips_lock);
576 goto fail_free_priv;
577 }
578 esp_chips[dev->id] = esp;
579 spin_unlock(&esp_chips_lock);
580
581 err = scsi_esp_register(esp, &dev->dev);
582 if (err)
583 goto fail_free_irq;
584
585 return 0;
586
587 fail_free_irq:
588 spin_lock(&esp_chips_lock);
589 esp_chips[dev->id] = NULL;
590 if (esp_chips[!dev->id] == NULL) {
591 spin_unlock(&esp_chips_lock);
592 free_irq(host->irq, esp);
593 } else
594 spin_unlock(&esp_chips_lock);
595 fail_free_priv:
596 kfree(mep);
597 fail_free_command_block:
598 kfree(esp->command_block);
599 fail_unlink:
600 scsi_host_put(host);
601 fail:
602 return err;
603 }
604
605 static int esp_mac_remove(struct platform_device *dev)
606 {
607 struct mac_esp_priv *mep = platform_get_drvdata(dev);
608 struct esp *esp = mep->esp;
609 unsigned int irq = esp->host->irq;
610
611 scsi_esp_unregister(esp);
612
613 spin_lock(&esp_chips_lock);
614 esp_chips[dev->id] = NULL;
615 if (esp_chips[!dev->id] == NULL) {
616 spin_unlock(&esp_chips_lock);
617 free_irq(irq, NULL);
618 } else
619 spin_unlock(&esp_chips_lock);
620
621 kfree(mep);
622
623 kfree(esp->command_block);
624
625 scsi_host_put(esp->host);
626
627 return 0;
628 }
629
630 static struct platform_driver esp_mac_driver = {
631 .probe = esp_mac_probe,
632 .remove = esp_mac_remove,
633 .driver = {
634 .name = DRV_MODULE_NAME,
635 },
636 };
637
638 static int __init mac_esp_init(void)
639 {
640 return platform_driver_register(&esp_mac_driver);
641 }
642
643 static void __exit mac_esp_exit(void)
644 {
645 platform_driver_unregister(&esp_mac_driver);
646 }
647
648 MODULE_DESCRIPTION("Mac ESP SCSI driver");
649 MODULE_AUTHOR("Finn Thain <fthain@telegraphics.com.au>");
650 MODULE_LICENSE("GPL v2");
651 MODULE_VERSION(DRV_VERSION);
652 MODULE_ALIAS("platform:" DRV_MODULE_NAME);
653
654 module_init(mac_esp_init);
655 module_exit(mac_esp_exit);
Linux with added FPC-III support