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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> | |
1da177e4 LT |
25 | #include <asm/pgtable.h> |
26 | ||
27 | #include "../scsi.h" | |
28 | #include <scsi/scsi_host.h> | |
29 | #include "fas216.h" | |
30 | #include "scsi.h" | |
31 | ||
32 | #include <scsi/scsicam.h> | |
33 | ||
34 | #define POWERTEC_FAS216_OFFSET 0x3000 | |
35 | #define POWERTEC_FAS216_SHIFT 6 | |
36 | ||
37 | #define POWERTEC_INTR_STATUS 0x2000 | |
38 | #define POWERTEC_INTR_BIT 0x80 | |
39 | ||
40 | #define POWERTEC_RESET_CONTROL 0x1018 | |
41 | #define POWERTEC_RESET_BIT 1 | |
42 | ||
43 | #define POWERTEC_TERM_CONTROL 0x2018 | |
44 | #define POWERTEC_TERM_ENABLE 1 | |
45 | ||
46 | #define POWERTEC_INTR_CONTROL 0x101c | |
47 | #define POWERTEC_INTR_ENABLE 1 | |
48 | #define POWERTEC_INTR_DISABLE 0 | |
49 | ||
50 | #define VERSION "1.10 (19/01/2003 2.5.59)" | |
51 | ||
52 | /* | |
53 | * Use term=0,1,0,0,0 to turn terminators on/off. | |
54 | * One entry per slot. | |
55 | */ | |
56 | static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 }; | |
57 | ||
58 | #define NR_SG 256 | |
59 | ||
60 | struct powertec_info { | |
61 | FAS216_Info info; | |
62 | struct expansion_card *ec; | |
63 | void __iomem *base; | |
64 | unsigned int term_ctl; | |
65 | struct scatterlist sg[NR_SG]; | |
66 | }; | |
67 | ||
68 | /* Prototype: void powertecscsi_irqenable(ec, irqnr) | |
69 | * Purpose : Enable interrupts on Powertec SCSI card | |
70 | * Params : ec - expansion card structure | |
71 | * : irqnr - interrupt number | |
72 | */ | |
73 | static void | |
74 | powertecscsi_irqenable(struct expansion_card *ec, int irqnr) | |
75 | { | |
76 | struct powertec_info *info = ec->irq_data; | |
77 | writeb(POWERTEC_INTR_ENABLE, info->base + POWERTEC_INTR_CONTROL); | |
78 | } | |
79 | ||
80 | /* Prototype: void powertecscsi_irqdisable(ec, irqnr) | |
81 | * Purpose : Disable interrupts on Powertec SCSI card | |
82 | * Params : ec - expansion card structure | |
83 | * : irqnr - interrupt number | |
84 | */ | |
85 | static void | |
86 | powertecscsi_irqdisable(struct expansion_card *ec, int irqnr) | |
87 | { | |
88 | struct powertec_info *info = ec->irq_data; | |
89 | writeb(POWERTEC_INTR_DISABLE, info->base + POWERTEC_INTR_CONTROL); | |
90 | } | |
91 | ||
92 | static const expansioncard_ops_t powertecscsi_ops = { | |
93 | .irqenable = powertecscsi_irqenable, | |
94 | .irqdisable = powertecscsi_irqdisable, | |
95 | }; | |
96 | ||
97 | /* Prototype: void powertecscsi_terminator_ctl(host, on_off) | |
98 | * Purpose : Turn the Powertec SCSI terminators on or off | |
99 | * Params : host - card to turn on/off | |
100 | * : on_off - !0 to turn on, 0 to turn off | |
101 | */ | |
102 | static void | |
103 | powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off) | |
104 | { | |
105 | struct powertec_info *info = (struct powertec_info *)host->hostdata; | |
106 | ||
107 | info->term_ctl = on_off ? POWERTEC_TERM_ENABLE : 0; | |
108 | writeb(info->term_ctl, info->base + POWERTEC_TERM_CONTROL); | |
109 | } | |
110 | ||
111 | /* Prototype: void powertecscsi_intr(irq, *dev_id, *regs) | |
112 | * Purpose : handle interrupts from Powertec SCSI card | |
113 | * Params : irq - interrupt number | |
114 | * dev_id - user-defined (Scsi_Host structure) | |
115 | * regs - processor registers at interrupt | |
116 | */ | |
117 | static irqreturn_t | |
118 | powertecscsi_intr(int irq, void *dev_id, struct pt_regs *regs) | |
119 | { | |
120 | struct powertec_info *info = dev_id; | |
121 | ||
122 | return fas216_intr(&info->info); | |
123 | } | |
124 | ||
125 | /* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type) | |
126 | * Purpose : initialises DMA/PIO | |
127 | * Params : host - host | |
128 | * SCpnt - command | |
129 | * direction - DMA on to/off of card | |
130 | * min_type - minimum DMA support that we must have for this transfer | |
131 | * Returns : type of transfer to be performed | |
132 | */ | |
133 | static fasdmatype_t | |
0a04137e | 134 | powertecscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp, |
1da177e4 LT |
135 | fasdmadir_t direction, fasdmatype_t min_type) |
136 | { | |
137 | struct powertec_info *info = (struct powertec_info *)host->hostdata; | |
138 | struct device *dev = scsi_get_device(host); | |
139 | int dmach = info->info.scsi.dma; | |
140 | ||
141 | if (info->info.ifcfg.capabilities & FASCAP_DMA && | |
142 | min_type == fasdma_real_all) { | |
143 | int bufs, map_dir, dma_dir; | |
144 | ||
145 | bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG); | |
146 | ||
147 | if (direction == DMA_OUT) | |
148 | map_dir = DMA_TO_DEVICE, | |
149 | dma_dir = DMA_MODE_WRITE; | |
150 | else | |
151 | map_dir = DMA_FROM_DEVICE, | |
152 | dma_dir = DMA_MODE_READ; | |
153 | ||
154 | dma_map_sg(dev, info->sg, bufs + 1, map_dir); | |
155 | ||
156 | disable_dma(dmach); | |
157 | set_dma_sg(dmach, info->sg, bufs + 1); | |
158 | set_dma_mode(dmach, dma_dir); | |
159 | enable_dma(dmach); | |
160 | return fasdma_real_all; | |
161 | } | |
162 | ||
163 | /* | |
164 | * If we're not doing DMA, | |
165 | * we'll do slow PIO | |
166 | */ | |
167 | return fasdma_pio; | |
168 | } | |
169 | ||
170 | /* Prototype: int powertecscsi_dma_stop(host, SCpnt) | |
171 | * Purpose : stops DMA/PIO | |
172 | * Params : host - host | |
173 | * SCpnt - command | |
174 | */ | |
175 | static void | |
0a04137e | 176 | powertecscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp) |
1da177e4 LT |
177 | { |
178 | struct powertec_info *info = (struct powertec_info *)host->hostdata; | |
179 | if (info->info.scsi.dma != NO_DMA) | |
180 | disable_dma(info->info.scsi.dma); | |
181 | } | |
182 | ||
183 | /* Prototype: const char *powertecscsi_info(struct Scsi_Host * host) | |
184 | * Purpose : returns a descriptive string about this interface, | |
185 | * Params : host - driver host structure to return info for. | |
186 | * Returns : pointer to a static buffer containing null terminated string. | |
187 | */ | |
188 | const char *powertecscsi_info(struct Scsi_Host *host) | |
189 | { | |
190 | struct powertec_info *info = (struct powertec_info *)host->hostdata; | |
191 | static char string[150]; | |
192 | ||
193 | sprintf(string, "%s (%s) in slot %d v%s terminators o%s", | |
194 | host->hostt->name, info->info.scsi.type, info->ec->slot_no, | |
195 | VERSION, info->term_ctl ? "n" : "ff"); | |
196 | ||
197 | return string; | |
198 | } | |
199 | ||
200 | /* Prototype: int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length) | |
201 | * Purpose : Set a driver specific function | |
202 | * Params : host - host to setup | |
203 | * : buffer - buffer containing string describing operation | |
204 | * : length - length of string | |
205 | * Returns : -EINVAL, or 0 | |
206 | */ | |
207 | static int | |
208 | powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length) | |
209 | { | |
210 | int ret = length; | |
211 | ||
212 | if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) { | |
213 | buffer += 12; | |
214 | length -= 12; | |
215 | ||
216 | if (length >= 5 && strncmp(buffer, "term=", 5) == 0) { | |
217 | if (buffer[5] == '1') | |
218 | powertecscsi_terminator_ctl(host, 1); | |
219 | else if (buffer[5] == '0') | |
220 | powertecscsi_terminator_ctl(host, 0); | |
221 | else | |
222 | ret = -EINVAL; | |
223 | } else | |
224 | ret = -EINVAL; | |
225 | } else | |
226 | ret = -EINVAL; | |
227 | ||
228 | return ret; | |
229 | } | |
230 | ||
231 | /* Prototype: int powertecscsi_proc_info(char *buffer, char **start, off_t offset, | |
232 | * int length, int host_no, int inout) | |
233 | * Purpose : Return information about the driver to a user process accessing | |
234 | * the /proc filesystem. | |
235 | * Params : buffer - a buffer to write information to | |
236 | * start - a pointer into this buffer set by this routine to the start | |
237 | * of the required information. | |
238 | * offset - offset into information that we have read upto. | |
239 | * length - length of buffer | |
240 | * inout - 0 for reading, 1 for writing. | |
241 | * Returns : length of data written to buffer. | |
242 | */ | |
243 | int powertecscsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, | |
244 | int length, int inout) | |
245 | { | |
246 | struct powertec_info *info; | |
247 | char *p = buffer; | |
248 | int pos; | |
249 | ||
250 | if (inout == 1) | |
251 | return powertecscsi_set_proc_info(host, buffer, length); | |
252 | ||
253 | info = (struct powertec_info *)host->hostdata; | |
254 | ||
255 | p += sprintf(p, "PowerTec SCSI driver v%s\n", VERSION); | |
256 | p += fas216_print_host(&info->info, p); | |
257 | p += sprintf(p, "Term : o%s\n", | |
258 | info->term_ctl ? "n" : "ff"); | |
259 | ||
260 | p += fas216_print_stats(&info->info, p); | |
261 | p += fas216_print_devices(&info->info, p); | |
262 | ||
263 | *start = buffer + offset; | |
264 | pos = p - buffer - offset; | |
265 | if (pos > length) | |
266 | pos = length; | |
267 | ||
268 | return pos; | |
269 | } | |
270 | ||
10523b3b | 271 | static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
272 | { |
273 | struct expansion_card *ec = ECARD_DEV(dev); | |
274 | struct Scsi_Host *host = ecard_get_drvdata(ec); | |
275 | struct powertec_info *info = (struct powertec_info *)host->hostdata; | |
276 | ||
277 | return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0); | |
278 | } | |
279 | ||
280 | static ssize_t | |
10523b3b | 281 | powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) |
1da177e4 LT |
282 | { |
283 | struct expansion_card *ec = ECARD_DEV(dev); | |
284 | struct Scsi_Host *host = ecard_get_drvdata(ec); | |
285 | ||
286 | if (len > 1) | |
287 | powertecscsi_terminator_ctl(host, buf[0] != '0'); | |
288 | ||
289 | return len; | |
290 | } | |
291 | ||
292 | static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR, | |
293 | powertecscsi_show_term, powertecscsi_store_term); | |
294 | ||
d0be4a7d | 295 | static struct scsi_host_template powertecscsi_template = { |
1da177e4 LT |
296 | .module = THIS_MODULE, |
297 | .proc_info = powertecscsi_proc_info, | |
298 | .name = "PowerTec SCSI", | |
299 | .info = powertecscsi_info, | |
300 | .queuecommand = fas216_queue_command, | |
301 | .eh_host_reset_handler = fas216_eh_host_reset, | |
302 | .eh_bus_reset_handler = fas216_eh_bus_reset, | |
303 | .eh_device_reset_handler = fas216_eh_device_reset, | |
304 | .eh_abort_handler = fas216_eh_abort, | |
305 | ||
306 | .can_queue = 8, | |
307 | .this_id = 7, | |
308 | .sg_tablesize = SG_ALL, | |
309 | .cmd_per_lun = 2, | |
310 | .use_clustering = ENABLE_CLUSTERING, | |
311 | .proc_name = "powertec", | |
312 | }; | |
313 | ||
314 | static int __devinit | |
315 | powertecscsi_probe(struct expansion_card *ec, const struct ecard_id *id) | |
316 | { | |
317 | struct Scsi_Host *host; | |
318 | struct powertec_info *info; | |
319 | unsigned long resbase, reslen; | |
320 | void __iomem *base; | |
321 | int ret; | |
322 | ||
323 | ret = ecard_request_resources(ec); | |
324 | if (ret) | |
325 | goto out; | |
326 | ||
327 | resbase = ecard_resource_start(ec, ECARD_RES_IOCFAST); | |
328 | reslen = ecard_resource_len(ec, ECARD_RES_IOCFAST); | |
329 | base = ioremap(resbase, reslen); | |
330 | if (!base) { | |
331 | ret = -ENOMEM; | |
332 | goto out_region; | |
333 | } | |
334 | ||
335 | host = scsi_host_alloc(&powertecscsi_template, | |
336 | sizeof (struct powertec_info)); | |
337 | if (!host) { | |
338 | ret = -ENOMEM; | |
339 | goto out_unmap; | |
340 | } | |
341 | ||
342 | ecard_set_drvdata(ec, host); | |
343 | ||
344 | info = (struct powertec_info *)host->hostdata; | |
345 | info->base = base; | |
346 | powertecscsi_terminator_ctl(host, term[ec->slot_no]); | |
347 | ||
348 | info->info.scsi.io_base = base + POWERTEC_FAS216_OFFSET; | |
349 | info->info.scsi.io_shift = POWERTEC_FAS216_SHIFT; | |
350 | info->info.scsi.irq = ec->irq; | |
351 | info->info.scsi.dma = ec->dma; | |
352 | info->info.ifcfg.clockrate = 40; /* MHz */ | |
353 | info->info.ifcfg.select_timeout = 255; | |
354 | info->info.ifcfg.asyncperiod = 200; /* ns */ | |
355 | info->info.ifcfg.sync_max_depth = 7; | |
356 | info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK; | |
357 | info->info.ifcfg.disconnect_ok = 1; | |
358 | info->info.ifcfg.wide_max_size = 0; | |
359 | info->info.ifcfg.capabilities = 0; | |
360 | info->info.dma.setup = powertecscsi_dma_setup; | |
361 | info->info.dma.pseudo = NULL; | |
362 | info->info.dma.stop = powertecscsi_dma_stop; | |
363 | ||
364 | ec->irqaddr = base + POWERTEC_INTR_STATUS; | |
365 | ec->irqmask = POWERTEC_INTR_BIT; | |
366 | ec->irq_data = info; | |
367 | ec->ops = &powertecscsi_ops; | |
368 | ||
369 | device_create_file(&ec->dev, &dev_attr_bus_term); | |
370 | ||
371 | ret = fas216_init(host); | |
372 | if (ret) | |
373 | goto out_free; | |
374 | ||
375 | ret = request_irq(ec->irq, powertecscsi_intr, | |
1d6f359a | 376 | IRQF_DISABLED, "powertec", info); |
1da177e4 LT |
377 | if (ret) { |
378 | printk("scsi%d: IRQ%d not free: %d\n", | |
379 | host->host_no, ec->irq, ret); | |
380 | goto out_release; | |
381 | } | |
382 | ||
383 | if (info->info.scsi.dma != NO_DMA) { | |
384 | if (request_dma(info->info.scsi.dma, "powertec")) { | |
385 | printk("scsi%d: DMA%d not free, using PIO\n", | |
386 | host->host_no, info->info.scsi.dma); | |
387 | info->info.scsi.dma = NO_DMA; | |
388 | } else { | |
389 | set_dma_speed(info->info.scsi.dma, 180); | |
390 | info->info.ifcfg.capabilities |= FASCAP_DMA; | |
391 | } | |
392 | } | |
393 | ||
394 | ret = fas216_add(host, &ec->dev); | |
395 | if (ret == 0) | |
396 | goto out; | |
397 | ||
398 | if (info->info.scsi.dma != NO_DMA) | |
399 | free_dma(info->info.scsi.dma); | |
400 | free_irq(ec->irq, host); | |
401 | ||
402 | out_release: | |
403 | fas216_release(host); | |
404 | ||
405 | out_free: | |
406 | device_remove_file(&ec->dev, &dev_attr_bus_term); | |
407 | scsi_host_put(host); | |
408 | ||
409 | out_unmap: | |
410 | iounmap(base); | |
411 | ||
412 | out_region: | |
413 | ecard_release_resources(ec); | |
414 | ||
415 | out: | |
416 | return ret; | |
417 | } | |
418 | ||
419 | static void __devexit powertecscsi_remove(struct expansion_card *ec) | |
420 | { | |
421 | struct Scsi_Host *host = ecard_get_drvdata(ec); | |
422 | struct powertec_info *info = (struct powertec_info *)host->hostdata; | |
423 | ||
424 | ecard_set_drvdata(ec, NULL); | |
425 | fas216_remove(host); | |
426 | ||
427 | device_remove_file(&ec->dev, &dev_attr_bus_term); | |
428 | ||
429 | if (info->info.scsi.dma != NO_DMA) | |
430 | free_dma(info->info.scsi.dma); | |
431 | free_irq(ec->irq, info); | |
432 | ||
433 | iounmap(info->base); | |
434 | ||
435 | fas216_release(host); | |
436 | scsi_host_put(host); | |
437 | ecard_release_resources(ec); | |
438 | } | |
439 | ||
440 | static const struct ecard_id powertecscsi_cids[] = { | |
441 | { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI }, | |
442 | { 0xffff, 0xffff }, | |
443 | }; | |
444 | ||
445 | static struct ecard_driver powertecscsi_driver = { | |
446 | .probe = powertecscsi_probe, | |
447 | .remove = __devexit_p(powertecscsi_remove), | |
448 | .id_table = powertecscsi_cids, | |
449 | .drv = { | |
450 | .name = "powertecscsi", | |
451 | }, | |
452 | }; | |
453 | ||
454 | static int __init powertecscsi_init(void) | |
455 | { | |
456 | return ecard_register_driver(&powertecscsi_driver); | |
457 | } | |
458 | ||
459 | static void __exit powertecscsi_exit(void) | |
460 | { | |
461 | ecard_remove_driver(&powertecscsi_driver); | |
462 | } | |
463 | ||
464 | module_init(powertecscsi_init); | |
465 | module_exit(powertecscsi_exit); | |
466 | ||
467 | MODULE_AUTHOR("Russell King"); | |
468 | MODULE_DESCRIPTION("Powertec SCSI driver"); | |
8d3b33f6 | 469 | module_param_array(term, int, NULL, 0); |
1da177e4 LT |
470 | MODULE_PARM_DESC(term, "SCSI bus termination"); |
471 | MODULE_LICENSE("GPL"); |