GNU Linux-libre 5.10.219-gnu1
[releases.git] / drivers / scsi / sun3_scsi.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Sun3 SCSI stuff by Erik Verbruggen (erik@bigmama.xtdnet.nl)
4  *
5  * Sun3 DMA routines added by Sam Creasey (sammy@sammy.net)
6  *
7  * VME support added by Sam Creasey
8  *
9  * TODO: modify this driver to support multiple Sun3 SCSI VME boards
10  *
11  * Adapted from mac_scsinew.c:
12  */
13 /*
14  * Generic Macintosh NCR5380 driver
15  *
16  * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
17  *
18  * derived in part from:
19  */
20 /*
21  * Generic Generic NCR5380 driver
22  *
23  * Copyright 1995, Russell King
24  */
25
26 #include <linux/types.h>
27 #include <linux/delay.h>
28 #include <linux/module.h>
29 #include <linux/ioport.h>
30 #include <linux/init.h>
31 #include <linux/blkdev.h>
32 #include <linux/platform_device.h>
33
34 #include <asm/io.h>
35 #include <asm/dvma.h>
36
37 #include <scsi/scsi_host.h>
38
39 /* minimum number of bytes to do dma on */
40 #define DMA_MIN_SIZE                    129
41
42 /* Definitions for the core NCR5380 driver. */
43
44 #define NCR5380_implementation_fields   /* none */
45
46 #define NCR5380_read(reg)               in_8(hostdata->io + (reg))
47 #define NCR5380_write(reg, value)       out_8(hostdata->io + (reg), value)
48
49 #define NCR5380_queue_command           sun3scsi_queue_command
50 #define NCR5380_host_reset              sun3scsi_host_reset
51 #define NCR5380_abort                   sun3scsi_abort
52 #define NCR5380_info                    sun3scsi_info
53
54 #define NCR5380_dma_xfer_len            sun3scsi_dma_xfer_len
55 #define NCR5380_dma_recv_setup          sun3scsi_dma_count
56 #define NCR5380_dma_send_setup          sun3scsi_dma_count
57 #define NCR5380_dma_residual            sun3scsi_dma_residual
58
59 #include "NCR5380.h"
60
61 /* dma regs start at regbase + 8, directly after the NCR regs */
62 struct sun3_dma_regs {
63         unsigned short dma_addr_hi; /* vme only */
64         unsigned short dma_addr_lo; /* vme only */
65         unsigned short dma_count_hi; /* vme only */
66         unsigned short dma_count_lo; /* vme only */
67         unsigned short udc_data; /* udc dma data reg (obio only) */
68         unsigned short udc_addr; /* uda dma addr reg (obio only) */
69         unsigned short fifo_data; /* fifo data reg,
70                                    * holds extra byte on odd dma reads
71                                    */
72         unsigned short fifo_count;
73         unsigned short csr; /* control/status reg */
74         unsigned short bpack_hi; /* vme only */
75         unsigned short bpack_lo; /* vme only */
76         unsigned short ivect; /* vme only */
77         unsigned short fifo_count_hi; /* vme only */
78 };
79
80 /* ucd chip specific regs - live in dvma space */
81 struct sun3_udc_regs {
82         unsigned short rsel; /* select regs to load */
83         unsigned short addr_hi; /* high word of addr */
84         unsigned short addr_lo; /* low word */
85         unsigned short count; /* words to be xfer'd */
86         unsigned short mode_hi; /* high word of channel mode */
87         unsigned short mode_lo; /* low word of channel mode */
88 };
89
90 /* addresses of the udc registers */
91 #define UDC_MODE 0x38
92 #define UDC_CSR 0x2e /* command/status */
93 #define UDC_CHN_HI 0x26 /* chain high word */
94 #define UDC_CHN_LO 0x22 /* chain lo word */
95 #define UDC_CURA_HI 0x1a /* cur reg A high */
96 #define UDC_CURA_LO 0x0a /* cur reg A low */
97 #define UDC_CURB_HI 0x12 /* cur reg B high */
98 #define UDC_CURB_LO 0x02 /* cur reg B low */
99 #define UDC_MODE_HI 0x56 /* mode reg high */
100 #define UDC_MODE_LO 0x52 /* mode reg low */
101 #define UDC_COUNT 0x32 /* words to xfer */
102
103 /* some udc commands */
104 #define UDC_RESET 0
105 #define UDC_CHN_START 0xa0 /* start chain */
106 #define UDC_INT_ENABLE 0x32 /* channel 1 int on */
107
108 /* udc mode words */
109 #define UDC_MODE_HIWORD 0x40
110 #define UDC_MODE_LSEND 0xc2
111 #define UDC_MODE_LRECV 0xd2
112
113 /* udc reg selections */
114 #define UDC_RSEL_SEND 0x282
115 #define UDC_RSEL_RECV 0x182
116
117 /* bits in csr reg */
118 #define CSR_DMA_ACTIVE 0x8000
119 #define CSR_DMA_CONFLICT 0x4000
120 #define CSR_DMA_BUSERR 0x2000
121
122 #define CSR_FIFO_EMPTY 0x400 /* fifo flushed? */
123 #define CSR_SDB_INT 0x200 /* sbc interrupt pending */
124 #define CSR_DMA_INT 0x100 /* dma interrupt pending */
125
126 #define CSR_LEFT 0xc0
127 #define CSR_LEFT_3 0xc0
128 #define CSR_LEFT_2 0x80
129 #define CSR_LEFT_1 0x40
130 #define CSR_PACK_ENABLE 0x20
131
132 #define CSR_DMA_ENABLE 0x10
133
134 #define CSR_SEND 0x8 /* 1 = send  0 = recv */
135 #define CSR_FIFO 0x2 /* reset fifo */
136 #define CSR_INTR 0x4 /* interrupt enable */
137 #define CSR_SCSI 0x1
138
139 #define VME_DATA24 0x3d00
140
141 extern int sun3_map_test(unsigned long, char *);
142
143 static int setup_can_queue = -1;
144 module_param(setup_can_queue, int, 0);
145 static int setup_cmd_per_lun = -1;
146 module_param(setup_cmd_per_lun, int, 0);
147 static int setup_sg_tablesize = -1;
148 module_param(setup_sg_tablesize, int, 0);
149 static int setup_hostid = -1;
150 module_param(setup_hostid, int, 0);
151
152 /* ms to wait after hitting dma regs */
153 #define SUN3_DMA_DELAY 10
154
155 /* dvma buffer to allocate -- 32k should hopefully be more than sufficient */
156 #define SUN3_DVMA_BUFSIZE 0xe000
157
158 static struct scsi_cmnd *sun3_dma_setup_done;
159 static volatile struct sun3_dma_regs *dregs;
160 static struct sun3_udc_regs *udc_regs;
161 static unsigned char *sun3_dma_orig_addr;
162 static unsigned long sun3_dma_orig_count;
163 static int sun3_dma_active;
164 static unsigned long last_residual;
165
166 #ifndef SUN3_SCSI_VME
167 /* dma controller register access functions */
168
169 static inline unsigned short sun3_udc_read(unsigned char reg)
170 {
171         unsigned short ret;
172
173         dregs->udc_addr = UDC_CSR;
174         udelay(SUN3_DMA_DELAY);
175         ret = dregs->udc_data;
176         udelay(SUN3_DMA_DELAY);
177         
178         return ret;
179 }
180
181 static inline void sun3_udc_write(unsigned short val, unsigned char reg)
182 {
183         dregs->udc_addr = reg;
184         udelay(SUN3_DMA_DELAY);
185         dregs->udc_data = val;
186         udelay(SUN3_DMA_DELAY);
187 }
188 #endif
189
190 // safe bits for the CSR
191 #define CSR_GOOD 0x060f
192
193 static irqreturn_t scsi_sun3_intr(int irq, void *dev)
194 {
195         struct Scsi_Host *instance = dev;
196         unsigned short csr = dregs->csr;
197         int handled = 0;
198
199 #ifdef SUN3_SCSI_VME
200         dregs->csr &= ~CSR_DMA_ENABLE;
201 #endif
202
203         if(csr & ~CSR_GOOD) {
204                 if (csr & CSR_DMA_BUSERR)
205                         shost_printk(KERN_ERR, instance, "bus error in DMA\n");
206                 if (csr & CSR_DMA_CONFLICT)
207                         shost_printk(KERN_ERR, instance, "DMA conflict\n");
208                 handled = 1;
209         }
210
211         if(csr & (CSR_SDB_INT | CSR_DMA_INT)) {
212                 NCR5380_intr(irq, dev);
213                 handled = 1;
214         }
215
216         return IRQ_RETVAL(handled);
217 }
218
219 /* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */
220 static int sun3scsi_dma_setup(struct NCR5380_hostdata *hostdata,
221                               unsigned char *data, int count, int write_flag)
222 {
223         void *addr;
224
225         if(sun3_dma_orig_addr != NULL)
226                 dvma_unmap(sun3_dma_orig_addr);
227
228 #ifdef SUN3_SCSI_VME
229         addr = (void *)dvma_map_vme((unsigned long) data, count);
230 #else
231         addr = (void *)dvma_map((unsigned long) data, count);
232 #endif
233                 
234         sun3_dma_orig_addr = addr;
235         sun3_dma_orig_count = count;
236
237 #ifndef SUN3_SCSI_VME
238         dregs->fifo_count = 0;
239         sun3_udc_write(UDC_RESET, UDC_CSR);
240         
241         /* reset fifo */
242         dregs->csr &= ~CSR_FIFO;
243         dregs->csr |= CSR_FIFO;
244 #endif
245         
246         /* set direction */
247         if(write_flag)
248                 dregs->csr |= CSR_SEND;
249         else
250                 dregs->csr &= ~CSR_SEND;
251         
252 #ifdef SUN3_SCSI_VME
253         dregs->csr |= CSR_PACK_ENABLE;
254
255         dregs->dma_addr_hi = ((unsigned long)addr >> 16);
256         dregs->dma_addr_lo = ((unsigned long)addr & 0xffff);
257
258         dregs->dma_count_hi = 0;
259         dregs->dma_count_lo = 0;
260         dregs->fifo_count_hi = 0;
261         dregs->fifo_count = 0;
262 #else
263         /* byte count for fifo */
264         dregs->fifo_count = count;
265
266         sun3_udc_write(UDC_RESET, UDC_CSR);
267         
268         /* reset fifo */
269         dregs->csr &= ~CSR_FIFO;
270         dregs->csr |= CSR_FIFO;
271         
272         if(dregs->fifo_count != count) { 
273                 shost_printk(KERN_ERR, hostdata->host,
274                              "FIFO mismatch %04x not %04x\n",
275                              dregs->fifo_count, (unsigned int) count);
276                 NCR5380_dprint(NDEBUG_DMA, hostdata->host);
277         }
278
279         /* setup udc */
280         udc_regs->addr_hi = (((unsigned long)(addr) & 0xff0000) >> 8);
281         udc_regs->addr_lo = ((unsigned long)(addr) & 0xffff);
282         udc_regs->count = count/2; /* count in words */
283         udc_regs->mode_hi = UDC_MODE_HIWORD;
284         if(write_flag) {
285                 if(count & 1)
286                         udc_regs->count++;
287                 udc_regs->mode_lo = UDC_MODE_LSEND;
288                 udc_regs->rsel = UDC_RSEL_SEND;
289         } else {
290                 udc_regs->mode_lo = UDC_MODE_LRECV;
291                 udc_regs->rsel = UDC_RSEL_RECV;
292         }
293         
294         /* announce location of regs block */
295         sun3_udc_write(((dvma_vtob(udc_regs) & 0xff0000) >> 8),
296                        UDC_CHN_HI); 
297
298         sun3_udc_write((dvma_vtob(udc_regs) & 0xffff), UDC_CHN_LO);
299
300         /* set dma master on */
301         sun3_udc_write(0xd, UDC_MODE);
302
303         /* interrupt enable */
304         sun3_udc_write(UDC_INT_ENABLE, UDC_CSR);
305 #endif
306         
307         return count;
308
309 }
310
311 static int sun3scsi_dma_count(struct NCR5380_hostdata *hostdata,
312                               unsigned char *data, int count)
313 {
314         return count;
315 }
316
317 static inline int sun3scsi_dma_recv_setup(struct NCR5380_hostdata *hostdata,
318                                           unsigned char *data, int count)
319 {
320         return sun3scsi_dma_setup(hostdata, data, count, 0);
321 }
322
323 static inline int sun3scsi_dma_send_setup(struct NCR5380_hostdata *hostdata,
324                                           unsigned char *data, int count)
325 {
326         return sun3scsi_dma_setup(hostdata, data, count, 1);
327 }
328
329 static int sun3scsi_dma_residual(struct NCR5380_hostdata *hostdata)
330 {
331         return last_residual;
332 }
333
334 static int sun3scsi_dma_xfer_len(struct NCR5380_hostdata *hostdata,
335                                  struct scsi_cmnd *cmd)
336 {
337         int wanted_len = cmd->SCp.this_residual;
338
339         if (wanted_len < DMA_MIN_SIZE || blk_rq_is_passthrough(cmd->request))
340                 return 0;
341
342         return wanted_len;
343 }
344
345 static inline int sun3scsi_dma_start(unsigned long count, unsigned char *data)
346 {
347 #ifdef SUN3_SCSI_VME
348         unsigned short csr;
349
350         csr = dregs->csr;
351
352         dregs->dma_count_hi = (sun3_dma_orig_count >> 16);
353         dregs->dma_count_lo = (sun3_dma_orig_count & 0xffff);
354
355         dregs->fifo_count_hi = (sun3_dma_orig_count >> 16);
356         dregs->fifo_count = (sun3_dma_orig_count & 0xffff);
357
358 /*      if(!(csr & CSR_DMA_ENABLE))
359  *              dregs->csr |= CSR_DMA_ENABLE;
360  */
361 #else
362     sun3_udc_write(UDC_CHN_START, UDC_CSR);
363 #endif
364     
365     return 0;
366 }
367
368 /* clean up after our dma is done */
369 static int sun3scsi_dma_finish(int write_flag)
370 {
371         unsigned short __maybe_unused count;
372         unsigned short fifo;
373         int ret = 0;
374         
375         sun3_dma_active = 0;
376
377 #ifdef SUN3_SCSI_VME
378         dregs->csr &= ~CSR_DMA_ENABLE;
379
380         fifo = dregs->fifo_count;
381         if (write_flag) {
382                 if ((fifo > 0) && (fifo < sun3_dma_orig_count))
383                         fifo++;
384         }
385
386         last_residual = fifo;
387         /* empty bytes from the fifo which didn't make it */
388         if ((!write_flag) && (dregs->csr & CSR_LEFT)) {
389                 unsigned char *vaddr;
390
391                 vaddr = (unsigned char *)dvma_vmetov(sun3_dma_orig_addr);
392
393                 vaddr += (sun3_dma_orig_count - fifo);
394                 vaddr--;
395
396                 switch (dregs->csr & CSR_LEFT) {
397                 case CSR_LEFT_3:
398                         *vaddr = (dregs->bpack_lo & 0xff00) >> 8;
399                         vaddr--;
400                         fallthrough;
401
402                 case CSR_LEFT_2:
403                         *vaddr = (dregs->bpack_hi & 0x00ff);
404                         vaddr--;
405                         fallthrough;
406
407                 case CSR_LEFT_1:
408                         *vaddr = (dregs->bpack_hi & 0xff00) >> 8;
409                         break;
410                 }
411         }
412 #else
413         // check to empty the fifo on a read
414         if(!write_flag) {
415                 int tmo = 20000; /* .2 sec */
416                 
417                 while(1) {
418                         if(dregs->csr & CSR_FIFO_EMPTY)
419                                 break;
420
421                         if(--tmo <= 0) {
422                                 printk("sun3scsi: fifo failed to empty!\n");
423                                 return 1;
424                         }
425                         udelay(10);
426                 }
427         }
428
429         dregs->udc_addr = 0x32;
430         udelay(SUN3_DMA_DELAY);
431         count = 2 * dregs->udc_data;
432         udelay(SUN3_DMA_DELAY);
433
434         fifo = dregs->fifo_count;
435         last_residual = fifo;
436
437         /* empty bytes from the fifo which didn't make it */
438         if((!write_flag) && (count - fifo) == 2) {
439                 unsigned short data;
440                 unsigned char *vaddr;
441
442                 data = dregs->fifo_data;
443                 vaddr = (unsigned char *)dvma_btov(sun3_dma_orig_addr);
444                 
445                 vaddr += (sun3_dma_orig_count - fifo);
446
447                 vaddr[-2] = (data & 0xff00) >> 8;
448                 vaddr[-1] = (data & 0xff);
449         }
450 #endif
451
452         dvma_unmap(sun3_dma_orig_addr);
453         sun3_dma_orig_addr = NULL;
454
455 #ifdef SUN3_SCSI_VME
456         dregs->dma_addr_hi = 0;
457         dregs->dma_addr_lo = 0;
458         dregs->dma_count_hi = 0;
459         dregs->dma_count_lo = 0;
460
461         dregs->fifo_count = 0;
462         dregs->fifo_count_hi = 0;
463
464         dregs->csr &= ~CSR_SEND;
465 /*      dregs->csr |= CSR_DMA_ENABLE; */
466 #else
467         sun3_udc_write(UDC_RESET, UDC_CSR);
468         dregs->fifo_count = 0;
469         dregs->csr &= ~CSR_SEND;
470
471         /* reset fifo */
472         dregs->csr &= ~CSR_FIFO;
473         dregs->csr |= CSR_FIFO;
474 #endif
475         
476         sun3_dma_setup_done = NULL;
477
478         return ret;
479
480 }
481         
482 #include "NCR5380.c"
483
484 #ifdef SUN3_SCSI_VME
485 #define SUN3_SCSI_NAME          "Sun3 NCR5380 VME SCSI"
486 #define DRV_MODULE_NAME         "sun3_scsi_vme"
487 #else
488 #define SUN3_SCSI_NAME          "Sun3 NCR5380 SCSI"
489 #define DRV_MODULE_NAME         "sun3_scsi"
490 #endif
491
492 #define PFX                     DRV_MODULE_NAME ": "
493
494 static struct scsi_host_template sun3_scsi_template = {
495         .module                 = THIS_MODULE,
496         .proc_name              = DRV_MODULE_NAME,
497         .name                   = SUN3_SCSI_NAME,
498         .info                   = sun3scsi_info,
499         .queuecommand           = sun3scsi_queue_command,
500         .eh_abort_handler       = sun3scsi_abort,
501         .eh_host_reset_handler  = sun3scsi_host_reset,
502         .can_queue              = 16,
503         .this_id                = 7,
504         .sg_tablesize           = 1,
505         .cmd_per_lun            = 2,
506         .dma_boundary           = PAGE_SIZE - 1,
507         .cmd_size               = NCR5380_CMD_SIZE,
508 };
509
510 static int __init sun3_scsi_probe(struct platform_device *pdev)
511 {
512         struct Scsi_Host *instance;
513         struct NCR5380_hostdata *hostdata;
514         int error;
515         struct resource *irq, *mem;
516         void __iomem *ioaddr;
517         int host_flags = 0;
518 #ifdef SUN3_SCSI_VME
519         int i;
520 #endif
521
522         if (setup_can_queue > 0)
523                 sun3_scsi_template.can_queue = setup_can_queue;
524         if (setup_cmd_per_lun > 0)
525                 sun3_scsi_template.cmd_per_lun = setup_cmd_per_lun;
526         if (setup_sg_tablesize > 0)
527                 sun3_scsi_template.sg_tablesize = setup_sg_tablesize;
528         if (setup_hostid >= 0)
529                 sun3_scsi_template.this_id = setup_hostid & 7;
530
531 #ifdef SUN3_SCSI_VME
532         ioaddr = NULL;
533         for (i = 0; i < 2; i++) {
534                 unsigned char x;
535
536                 irq = platform_get_resource(pdev, IORESOURCE_IRQ, i);
537                 mem = platform_get_resource(pdev, IORESOURCE_MEM, i);
538                 if (!irq || !mem)
539                         break;
540
541                 ioaddr = sun3_ioremap(mem->start, resource_size(mem),
542                                       SUN3_PAGE_TYPE_VME16);
543                 dregs = (struct sun3_dma_regs *)(ioaddr + 8);
544
545                 if (sun3_map_test((unsigned long)dregs, &x)) {
546                         unsigned short oldcsr;
547
548                         oldcsr = dregs->csr;
549                         dregs->csr = 0;
550                         udelay(SUN3_DMA_DELAY);
551                         if (dregs->csr == 0x1400)
552                                 break;
553
554                         dregs->csr = oldcsr;
555                 }
556
557                 iounmap(ioaddr);
558                 ioaddr = NULL;
559         }
560         if (!ioaddr)
561                 return -ENODEV;
562 #else
563         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
564         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
565         if (!irq || !mem)
566                 return -ENODEV;
567
568         ioaddr = ioremap(mem->start, resource_size(mem));
569         dregs = (struct sun3_dma_regs *)(ioaddr + 8);
570
571         udc_regs = dvma_malloc(sizeof(struct sun3_udc_regs));
572         if (!udc_regs) {
573                 pr_err(PFX "couldn't allocate DVMA memory!\n");
574                 iounmap(ioaddr);
575                 return -ENOMEM;
576         }
577 #endif
578
579         instance = scsi_host_alloc(&sun3_scsi_template,
580                                    sizeof(struct NCR5380_hostdata));
581         if (!instance) {
582                 error = -ENOMEM;
583                 goto fail_alloc;
584         }
585
586         instance->irq = irq->start;
587
588         hostdata = shost_priv(instance);
589         hostdata->base = mem->start;
590         hostdata->io = ioaddr;
591
592         error = NCR5380_init(instance, host_flags);
593         if (error)
594                 goto fail_init;
595
596         error = request_irq(instance->irq, scsi_sun3_intr, 0,
597                             "NCR5380", instance);
598         if (error) {
599                 pr_err(PFX "scsi%d: IRQ %d not free, bailing out\n",
600                        instance->host_no, instance->irq);
601                 goto fail_irq;
602         }
603
604         dregs->csr = 0;
605         udelay(SUN3_DMA_DELAY);
606         dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR;
607         udelay(SUN3_DMA_DELAY);
608         dregs->fifo_count = 0;
609 #ifdef SUN3_SCSI_VME
610         dregs->fifo_count_hi = 0;
611         dregs->dma_addr_hi = 0;
612         dregs->dma_addr_lo = 0;
613         dregs->dma_count_hi = 0;
614         dregs->dma_count_lo = 0;
615
616         dregs->ivect = VME_DATA24 | (instance->irq & 0xff);
617 #endif
618
619         NCR5380_maybe_reset_bus(instance);
620
621         error = scsi_add_host(instance, NULL);
622         if (error)
623                 goto fail_host;
624
625         platform_set_drvdata(pdev, instance);
626
627         scsi_scan_host(instance);
628         return 0;
629
630 fail_host:
631         free_irq(instance->irq, instance);
632 fail_irq:
633         NCR5380_exit(instance);
634 fail_init:
635         scsi_host_put(instance);
636 fail_alloc:
637         if (udc_regs)
638                 dvma_free(udc_regs);
639         iounmap(ioaddr);
640         return error;
641 }
642
643 static int __exit sun3_scsi_remove(struct platform_device *pdev)
644 {
645         struct Scsi_Host *instance = platform_get_drvdata(pdev);
646         struct NCR5380_hostdata *hostdata = shost_priv(instance);
647         void __iomem *ioaddr = hostdata->io;
648
649         scsi_remove_host(instance);
650         free_irq(instance->irq, instance);
651         NCR5380_exit(instance);
652         scsi_host_put(instance);
653         if (udc_regs)
654                 dvma_free(udc_regs);
655         iounmap(ioaddr);
656         return 0;
657 }
658
659 static struct platform_driver sun3_scsi_driver = {
660         .remove = __exit_p(sun3_scsi_remove),
661         .driver = {
662                 .name   = DRV_MODULE_NAME,
663         },
664 };
665
666 module_platform_driver_probe(sun3_scsi_driver, sun3_scsi_probe);
667
668 MODULE_ALIAS("platform:" DRV_MODULE_NAME);
669 MODULE_LICENSE("GPL");