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1da177e4 LT |
1 | /* |
2 | * linux/drivers/acorn/scsi/powertec.c | |
3 | * | |
4 | * Copyright (C) 1997-2005 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/module.h> | |
11 | #include <linux/blkdev.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/ioport.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/proc_fs.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/dma-mapping.h> | |
21 | ||
22 | #include <asm/dma.h> | |
23 | #include <asm/ecard.h> | |
24 | #include <asm/io.h> | |
25 | #include <asm/irq.h> | |
26 | #include <asm/pgtable.h> | |
27 | ||
28 | #include "../scsi.h" | |
29 | #include <scsi/scsi_host.h> | |
30 | #include "fas216.h" | |
31 | #include "scsi.h" | |
32 | ||
33 | #include <scsi/scsicam.h> | |
34 | ||
35 | #define POWERTEC_FAS216_OFFSET 0x3000 | |
36 | #define POWERTEC_FAS216_SHIFT 6 | |
37 | ||
38 | #define POWERTEC_INTR_STATUS 0x2000 | |
39 | #define POWERTEC_INTR_BIT 0x80 | |
40 | ||
41 | #define POWERTEC_RESET_CONTROL 0x1018 | |
42 | #define POWERTEC_RESET_BIT 1 | |
43 | ||
44 | #define POWERTEC_TERM_CONTROL 0x2018 | |
45 | #define POWERTEC_TERM_ENABLE 1 | |
46 | ||
47 | #define POWERTEC_INTR_CONTROL 0x101c | |
48 | #define POWERTEC_INTR_ENABLE 1 | |
49 | #define POWERTEC_INTR_DISABLE 0 | |
50 | ||
51 | #define VERSION "1.10 (19/01/2003 2.5.59)" | |
52 | ||
53 | /* | |
54 | * Use term=0,1,0,0,0 to turn terminators on/off. | |
55 | * One entry per slot. | |
56 | */ | |
57 | static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 }; | |
58 | ||
59 | #define NR_SG 256 | |
60 | ||
61 | struct powertec_info { | |
62 | FAS216_Info info; | |
63 | struct expansion_card *ec; | |
64 | void __iomem *base; | |
65 | unsigned int term_ctl; | |
66 | struct scatterlist sg[NR_SG]; | |
67 | }; | |
68 | ||
69 | /* Prototype: void powertecscsi_irqenable(ec, irqnr) | |
70 | * Purpose : Enable interrupts on Powertec SCSI card | |
71 | * Params : ec - expansion card structure | |
72 | * : irqnr - interrupt number | |
73 | */ | |
74 | static void | |
75 | powertecscsi_irqenable(struct expansion_card *ec, int irqnr) | |
76 | { | |
77 | struct powertec_info *info = ec->irq_data; | |
78 | writeb(POWERTEC_INTR_ENABLE, info->base + POWERTEC_INTR_CONTROL); | |
79 | } | |
80 | ||
81 | /* Prototype: void powertecscsi_irqdisable(ec, irqnr) | |
82 | * Purpose : Disable interrupts on Powertec SCSI card | |
83 | * Params : ec - expansion card structure | |
84 | * : irqnr - interrupt number | |
85 | */ | |
86 | static void | |
87 | powertecscsi_irqdisable(struct expansion_card *ec, int irqnr) | |
88 | { | |
89 | struct powertec_info *info = ec->irq_data; | |
90 | writeb(POWERTEC_INTR_DISABLE, info->base + POWERTEC_INTR_CONTROL); | |
91 | } | |
92 | ||
93 | static const expansioncard_ops_t powertecscsi_ops = { | |
94 | .irqenable = powertecscsi_irqenable, | |
95 | .irqdisable = powertecscsi_irqdisable, | |
96 | }; | |
97 | ||
98 | /* Prototype: void powertecscsi_terminator_ctl(host, on_off) | |
99 | * Purpose : Turn the Powertec SCSI terminators on or off | |
100 | * Params : host - card to turn on/off | |
101 | * : on_off - !0 to turn on, 0 to turn off | |
102 | */ | |
103 | static void | |
104 | powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off) | |
105 | { | |
106 | struct powertec_info *info = (struct powertec_info *)host->hostdata; | |
107 | ||
108 | info->term_ctl = on_off ? POWERTEC_TERM_ENABLE : 0; | |
109 | writeb(info->term_ctl, info->base + POWERTEC_TERM_CONTROL); | |
110 | } | |
111 | ||
112 | /* Prototype: void powertecscsi_intr(irq, *dev_id, *regs) | |
113 | * Purpose : handle interrupts from Powertec SCSI card | |
114 | * Params : irq - interrupt number | |
115 | * dev_id - user-defined (Scsi_Host structure) | |
116 | * regs - processor registers at interrupt | |
117 | */ | |
118 | static irqreturn_t | |
119 | powertecscsi_intr(int irq, void *dev_id, struct pt_regs *regs) | |
120 | { | |
121 | struct powertec_info *info = dev_id; | |
122 | ||
123 | return fas216_intr(&info->info); | |
124 | } | |
125 | ||
126 | /* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type) | |
127 | * Purpose : initialises DMA/PIO | |
128 | * Params : host - host | |
129 | * SCpnt - command | |
130 | * direction - DMA on to/off of card | |
131 | * min_type - minimum DMA support that we must have for this transfer | |
132 | * Returns : type of transfer to be performed | |
133 | */ | |
134 | static fasdmatype_t | |
135 | powertecscsi_dma_setup(struct Scsi_Host *host, Scsi_Pointer *SCp, | |
136 | fasdmadir_t direction, fasdmatype_t min_type) | |
137 | { | |
138 | struct powertec_info *info = (struct powertec_info *)host->hostdata; | |
139 | struct device *dev = scsi_get_device(host); | |
140 | int dmach = info->info.scsi.dma; | |
141 | ||
142 | if (info->info.ifcfg.capabilities & FASCAP_DMA && | |
143 | min_type == fasdma_real_all) { | |
144 | int bufs, map_dir, dma_dir; | |
145 | ||
146 | bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG); | |
147 | ||
148 | if (direction == DMA_OUT) | |
149 | map_dir = DMA_TO_DEVICE, | |
150 | dma_dir = DMA_MODE_WRITE; | |
151 | else | |
152 | map_dir = DMA_FROM_DEVICE, | |
153 | dma_dir = DMA_MODE_READ; | |
154 | ||
155 | dma_map_sg(dev, info->sg, bufs + 1, map_dir); | |
156 | ||
157 | disable_dma(dmach); | |
158 | set_dma_sg(dmach, info->sg, bufs + 1); | |
159 | set_dma_mode(dmach, dma_dir); | |
160 | enable_dma(dmach); | |
161 | return fasdma_real_all; | |
162 | } | |
163 | ||
164 | /* | |
165 | * If we're not doing DMA, | |
166 | * we'll do slow PIO | |
167 | */ | |
168 | return fasdma_pio; | |
169 | } | |
170 | ||
171 | /* Prototype: int powertecscsi_dma_stop(host, SCpnt) | |
172 | * Purpose : stops DMA/PIO | |
173 | * Params : host - host | |
174 | * SCpnt - command | |
175 | */ | |
176 | static void | |
177 | powertecscsi_dma_stop(struct Scsi_Host *host, Scsi_Pointer *SCp) | |
178 | { | |
179 | struct powertec_info *info = (struct powertec_info *)host->hostdata; | |
180 | if (info->info.scsi.dma != NO_DMA) | |
181 | disable_dma(info->info.scsi.dma); | |
182 | } | |
183 | ||
184 | /* Prototype: const char *powertecscsi_info(struct Scsi_Host * host) | |
185 | * Purpose : returns a descriptive string about this interface, | |
186 | * Params : host - driver host structure to return info for. | |
187 | * Returns : pointer to a static buffer containing null terminated string. | |
188 | */ | |
189 | const char *powertecscsi_info(struct Scsi_Host *host) | |
190 | { | |
191 | struct powertec_info *info = (struct powertec_info *)host->hostdata; | |
192 | static char string[150]; | |
193 | ||
194 | sprintf(string, "%s (%s) in slot %d v%s terminators o%s", | |
195 | host->hostt->name, info->info.scsi.type, info->ec->slot_no, | |
196 | VERSION, info->term_ctl ? "n" : "ff"); | |
197 | ||
198 | return string; | |
199 | } | |
200 | ||
201 | /* Prototype: int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length) | |
202 | * Purpose : Set a driver specific function | |
203 | * Params : host - host to setup | |
204 | * : buffer - buffer containing string describing operation | |
205 | * : length - length of string | |
206 | * Returns : -EINVAL, or 0 | |
207 | */ | |
208 | static int | |
209 | powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length) | |
210 | { | |
211 | int ret = length; | |
212 | ||
213 | if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) { | |
214 | buffer += 12; | |
215 | length -= 12; | |
216 | ||
217 | if (length >= 5 && strncmp(buffer, "term=", 5) == 0) { | |
218 | if (buffer[5] == '1') | |
219 | powertecscsi_terminator_ctl(host, 1); | |
220 | else if (buffer[5] == '0') | |
221 | powertecscsi_terminator_ctl(host, 0); | |
222 | else | |
223 | ret = -EINVAL; | |
224 | } else | |
225 | ret = -EINVAL; | |
226 | } else | |
227 | ret = -EINVAL; | |
228 | ||
229 | return ret; | |
230 | } | |
231 | ||
232 | /* Prototype: int powertecscsi_proc_info(char *buffer, char **start, off_t offset, | |
233 | * int length, int host_no, int inout) | |
234 | * Purpose : Return information about the driver to a user process accessing | |
235 | * the /proc filesystem. | |
236 | * Params : buffer - a buffer to write information to | |
237 | * start - a pointer into this buffer set by this routine to the start | |
238 | * of the required information. | |
239 | * offset - offset into information that we have read upto. | |
240 | * length - length of buffer | |
241 | * inout - 0 for reading, 1 for writing. | |
242 | * Returns : length of data written to buffer. | |
243 | */ | |
244 | int powertecscsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, | |
245 | int length, int inout) | |
246 | { | |
247 | struct powertec_info *info; | |
248 | char *p = buffer; | |
249 | int pos; | |
250 | ||
251 | if (inout == 1) | |
252 | return powertecscsi_set_proc_info(host, buffer, length); | |
253 | ||
254 | info = (struct powertec_info *)host->hostdata; | |
255 | ||
256 | p += sprintf(p, "PowerTec SCSI driver v%s\n", VERSION); | |
257 | p += fas216_print_host(&info->info, p); | |
258 | p += sprintf(p, "Term : o%s\n", | |
259 | info->term_ctl ? "n" : "ff"); | |
260 | ||
261 | p += fas216_print_stats(&info->info, p); | |
262 | p += fas216_print_devices(&info->info, p); | |
263 | ||
264 | *start = buffer + offset; | |
265 | pos = p - buffer - offset; | |
266 | if (pos > length) | |
267 | pos = length; | |
268 | ||
269 | return pos; | |
270 | } | |
271 | ||
10523b3b | 272 | static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
273 | { |
274 | struct expansion_card *ec = ECARD_DEV(dev); | |
275 | struct Scsi_Host *host = ecard_get_drvdata(ec); | |
276 | struct powertec_info *info = (struct powertec_info *)host->hostdata; | |
277 | ||
278 | return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0); | |
279 | } | |
280 | ||
281 | static ssize_t | |
10523b3b | 282 | powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) |
1da177e4 LT |
283 | { |
284 | struct expansion_card *ec = ECARD_DEV(dev); | |
285 | struct Scsi_Host *host = ecard_get_drvdata(ec); | |
286 | ||
287 | if (len > 1) | |
288 | powertecscsi_terminator_ctl(host, buf[0] != '0'); | |
289 | ||
290 | return len; | |
291 | } | |
292 | ||
293 | static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR, | |
294 | powertecscsi_show_term, powertecscsi_store_term); | |
295 | ||
296 | static Scsi_Host_Template powertecscsi_template = { | |
297 | .module = THIS_MODULE, | |
298 | .proc_info = powertecscsi_proc_info, | |
299 | .name = "PowerTec SCSI", | |
300 | .info = powertecscsi_info, | |
301 | .queuecommand = fas216_queue_command, | |
302 | .eh_host_reset_handler = fas216_eh_host_reset, | |
303 | .eh_bus_reset_handler = fas216_eh_bus_reset, | |
304 | .eh_device_reset_handler = fas216_eh_device_reset, | |
305 | .eh_abort_handler = fas216_eh_abort, | |
306 | ||
307 | .can_queue = 8, | |
308 | .this_id = 7, | |
309 | .sg_tablesize = SG_ALL, | |
310 | .cmd_per_lun = 2, | |
311 | .use_clustering = ENABLE_CLUSTERING, | |
312 | .proc_name = "powertec", | |
313 | }; | |
314 | ||
315 | static int __devinit | |
316 | powertecscsi_probe(struct expansion_card *ec, const struct ecard_id *id) | |
317 | { | |
318 | struct Scsi_Host *host; | |
319 | struct powertec_info *info; | |
320 | unsigned long resbase, reslen; | |
321 | void __iomem *base; | |
322 | int ret; | |
323 | ||
324 | ret = ecard_request_resources(ec); | |
325 | if (ret) | |
326 | goto out; | |
327 | ||
328 | resbase = ecard_resource_start(ec, ECARD_RES_IOCFAST); | |
329 | reslen = ecard_resource_len(ec, ECARD_RES_IOCFAST); | |
330 | base = ioremap(resbase, reslen); | |
331 | if (!base) { | |
332 | ret = -ENOMEM; | |
333 | goto out_region; | |
334 | } | |
335 | ||
336 | host = scsi_host_alloc(&powertecscsi_template, | |
337 | sizeof (struct powertec_info)); | |
338 | if (!host) { | |
339 | ret = -ENOMEM; | |
340 | goto out_unmap; | |
341 | } | |
342 | ||
343 | ecard_set_drvdata(ec, host); | |
344 | ||
345 | info = (struct powertec_info *)host->hostdata; | |
346 | info->base = base; | |
347 | powertecscsi_terminator_ctl(host, term[ec->slot_no]); | |
348 | ||
349 | info->info.scsi.io_base = base + POWERTEC_FAS216_OFFSET; | |
350 | info->info.scsi.io_shift = POWERTEC_FAS216_SHIFT; | |
351 | info->info.scsi.irq = ec->irq; | |
352 | info->info.scsi.dma = ec->dma; | |
353 | info->info.ifcfg.clockrate = 40; /* MHz */ | |
354 | info->info.ifcfg.select_timeout = 255; | |
355 | info->info.ifcfg.asyncperiod = 200; /* ns */ | |
356 | info->info.ifcfg.sync_max_depth = 7; | |
357 | info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK; | |
358 | info->info.ifcfg.disconnect_ok = 1; | |
359 | info->info.ifcfg.wide_max_size = 0; | |
360 | info->info.ifcfg.capabilities = 0; | |
361 | info->info.dma.setup = powertecscsi_dma_setup; | |
362 | info->info.dma.pseudo = NULL; | |
363 | info->info.dma.stop = powertecscsi_dma_stop; | |
364 | ||
365 | ec->irqaddr = base + POWERTEC_INTR_STATUS; | |
366 | ec->irqmask = POWERTEC_INTR_BIT; | |
367 | ec->irq_data = info; | |
368 | ec->ops = &powertecscsi_ops; | |
369 | ||
370 | device_create_file(&ec->dev, &dev_attr_bus_term); | |
371 | ||
372 | ret = fas216_init(host); | |
373 | if (ret) | |
374 | goto out_free; | |
375 | ||
376 | ret = request_irq(ec->irq, powertecscsi_intr, | |
377 | SA_INTERRUPT, "powertec", info); | |
378 | if (ret) { | |
379 | printk("scsi%d: IRQ%d not free: %d\n", | |
380 | host->host_no, ec->irq, ret); | |
381 | goto out_release; | |
382 | } | |
383 | ||
384 | if (info->info.scsi.dma != NO_DMA) { | |
385 | if (request_dma(info->info.scsi.dma, "powertec")) { | |
386 | printk("scsi%d: DMA%d not free, using PIO\n", | |
387 | host->host_no, info->info.scsi.dma); | |
388 | info->info.scsi.dma = NO_DMA; | |
389 | } else { | |
390 | set_dma_speed(info->info.scsi.dma, 180); | |
391 | info->info.ifcfg.capabilities |= FASCAP_DMA; | |
392 | } | |
393 | } | |
394 | ||
395 | ret = fas216_add(host, &ec->dev); | |
396 | if (ret == 0) | |
397 | goto out; | |
398 | ||
399 | if (info->info.scsi.dma != NO_DMA) | |
400 | free_dma(info->info.scsi.dma); | |
401 | free_irq(ec->irq, host); | |
402 | ||
403 | out_release: | |
404 | fas216_release(host); | |
405 | ||
406 | out_free: | |
407 | device_remove_file(&ec->dev, &dev_attr_bus_term); | |
408 | scsi_host_put(host); | |
409 | ||
410 | out_unmap: | |
411 | iounmap(base); | |
412 | ||
413 | out_region: | |
414 | ecard_release_resources(ec); | |
415 | ||
416 | out: | |
417 | return ret; | |
418 | } | |
419 | ||
420 | static void __devexit powertecscsi_remove(struct expansion_card *ec) | |
421 | { | |
422 | struct Scsi_Host *host = ecard_get_drvdata(ec); | |
423 | struct powertec_info *info = (struct powertec_info *)host->hostdata; | |
424 | ||
425 | ecard_set_drvdata(ec, NULL); | |
426 | fas216_remove(host); | |
427 | ||
428 | device_remove_file(&ec->dev, &dev_attr_bus_term); | |
429 | ||
430 | if (info->info.scsi.dma != NO_DMA) | |
431 | free_dma(info->info.scsi.dma); | |
432 | free_irq(ec->irq, info); | |
433 | ||
434 | iounmap(info->base); | |
435 | ||
436 | fas216_release(host); | |
437 | scsi_host_put(host); | |
438 | ecard_release_resources(ec); | |
439 | } | |
440 | ||
441 | static const struct ecard_id powertecscsi_cids[] = { | |
442 | { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI }, | |
443 | { 0xffff, 0xffff }, | |
444 | }; | |
445 | ||
446 | static struct ecard_driver powertecscsi_driver = { | |
447 | .probe = powertecscsi_probe, | |
448 | .remove = __devexit_p(powertecscsi_remove), | |
449 | .id_table = powertecscsi_cids, | |
450 | .drv = { | |
451 | .name = "powertecscsi", | |
452 | }, | |
453 | }; | |
454 | ||
455 | static int __init powertecscsi_init(void) | |
456 | { | |
457 | return ecard_register_driver(&powertecscsi_driver); | |
458 | } | |
459 | ||
460 | static void __exit powertecscsi_exit(void) | |
461 | { | |
462 | ecard_remove_driver(&powertecscsi_driver); | |
463 | } | |
464 | ||
465 | module_init(powertecscsi_init); | |
466 | module_exit(powertecscsi_exit); | |
467 | ||
468 | MODULE_AUTHOR("Russell King"); | |
469 | MODULE_DESCRIPTION("Powertec SCSI driver"); | |
470 | MODULE_PARM(term, "1-8i"); | |
471 | MODULE_PARM_DESC(term, "SCSI bus termination"); | |
472 | MODULE_LICENSE("GPL"); |