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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) | |
1da177e4 | 115 | */ |
7d12e780 | 116 | static irqreturn_t powertecscsi_intr(int irq, void *dev_id) |
1da177e4 LT |
117 | { |
118 | struct powertec_info *info = dev_id; | |
119 | ||
120 | return fas216_intr(&info->info); | |
121 | } | |
122 | ||
123 | /* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type) | |
124 | * Purpose : initialises DMA/PIO | |
125 | * Params : host - host | |
126 | * SCpnt - command | |
127 | * direction - DMA on to/off of card | |
128 | * min_type - minimum DMA support that we must have for this transfer | |
129 | * Returns : type of transfer to be performed | |
130 | */ | |
131 | static fasdmatype_t | |
0a04137e | 132 | powertecscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp, |
1da177e4 LT |
133 | fasdmadir_t direction, fasdmatype_t min_type) |
134 | { | |
135 | struct powertec_info *info = (struct powertec_info *)host->hostdata; | |
136 | struct device *dev = scsi_get_device(host); | |
137 | int dmach = info->info.scsi.dma; | |
138 | ||
139 | if (info->info.ifcfg.capabilities & FASCAP_DMA && | |
140 | min_type == fasdma_real_all) { | |
141 | int bufs, map_dir, dma_dir; | |
142 | ||
143 | bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG); | |
144 | ||
145 | if (direction == DMA_OUT) | |
146 | map_dir = DMA_TO_DEVICE, | |
147 | dma_dir = DMA_MODE_WRITE; | |
148 | else | |
149 | map_dir = DMA_FROM_DEVICE, | |
150 | dma_dir = DMA_MODE_READ; | |
151 | ||
152 | dma_map_sg(dev, info->sg, bufs + 1, map_dir); | |
153 | ||
154 | disable_dma(dmach); | |
155 | set_dma_sg(dmach, info->sg, bufs + 1); | |
156 | set_dma_mode(dmach, dma_dir); | |
157 | enable_dma(dmach); | |
158 | return fasdma_real_all; | |
159 | } | |
160 | ||
161 | /* | |
162 | * If we're not doing DMA, | |
163 | * we'll do slow PIO | |
164 | */ | |
165 | return fasdma_pio; | |
166 | } | |
167 | ||
168 | /* Prototype: int powertecscsi_dma_stop(host, SCpnt) | |
169 | * Purpose : stops DMA/PIO | |
170 | * Params : host - host | |
171 | * SCpnt - command | |
172 | */ | |
173 | static void | |
0a04137e | 174 | powertecscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp) |
1da177e4 LT |
175 | { |
176 | struct powertec_info *info = (struct powertec_info *)host->hostdata; | |
177 | if (info->info.scsi.dma != NO_DMA) | |
178 | disable_dma(info->info.scsi.dma); | |
179 | } | |
180 | ||
181 | /* Prototype: const char *powertecscsi_info(struct Scsi_Host * host) | |
182 | * Purpose : returns a descriptive string about this interface, | |
183 | * Params : host - driver host structure to return info for. | |
184 | * Returns : pointer to a static buffer containing null terminated string. | |
185 | */ | |
186 | const char *powertecscsi_info(struct Scsi_Host *host) | |
187 | { | |
188 | struct powertec_info *info = (struct powertec_info *)host->hostdata; | |
189 | static char string[150]; | |
190 | ||
191 | sprintf(string, "%s (%s) in slot %d v%s terminators o%s", | |
192 | host->hostt->name, info->info.scsi.type, info->ec->slot_no, | |
193 | VERSION, info->term_ctl ? "n" : "ff"); | |
194 | ||
195 | return string; | |
196 | } | |
197 | ||
198 | /* Prototype: int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length) | |
199 | * Purpose : Set a driver specific function | |
200 | * Params : host - host to setup | |
201 | * : buffer - buffer containing string describing operation | |
202 | * : length - length of string | |
203 | * Returns : -EINVAL, or 0 | |
204 | */ | |
205 | static int | |
206 | powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length) | |
207 | { | |
208 | int ret = length; | |
209 | ||
210 | if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) { | |
211 | buffer += 12; | |
212 | length -= 12; | |
213 | ||
214 | if (length >= 5 && strncmp(buffer, "term=", 5) == 0) { | |
215 | if (buffer[5] == '1') | |
216 | powertecscsi_terminator_ctl(host, 1); | |
217 | else if (buffer[5] == '0') | |
218 | powertecscsi_terminator_ctl(host, 0); | |
219 | else | |
220 | ret = -EINVAL; | |
221 | } else | |
222 | ret = -EINVAL; | |
223 | } else | |
224 | ret = -EINVAL; | |
225 | ||
226 | return ret; | |
227 | } | |
228 | ||
229 | /* Prototype: int powertecscsi_proc_info(char *buffer, char **start, off_t offset, | |
230 | * int length, int host_no, int inout) | |
231 | * Purpose : Return information about the driver to a user process accessing | |
232 | * the /proc filesystem. | |
233 | * Params : buffer - a buffer to write information to | |
234 | * start - a pointer into this buffer set by this routine to the start | |
235 | * of the required information. | |
236 | * offset - offset into information that we have read upto. | |
237 | * length - length of buffer | |
238 | * inout - 0 for reading, 1 for writing. | |
239 | * Returns : length of data written to buffer. | |
240 | */ | |
241 | int powertecscsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, | |
242 | int length, int inout) | |
243 | { | |
244 | struct powertec_info *info; | |
245 | char *p = buffer; | |
246 | int pos; | |
247 | ||
248 | if (inout == 1) | |
249 | return powertecscsi_set_proc_info(host, buffer, length); | |
250 | ||
251 | info = (struct powertec_info *)host->hostdata; | |
252 | ||
253 | p += sprintf(p, "PowerTec SCSI driver v%s\n", VERSION); | |
254 | p += fas216_print_host(&info->info, p); | |
255 | p += sprintf(p, "Term : o%s\n", | |
256 | info->term_ctl ? "n" : "ff"); | |
257 | ||
258 | p += fas216_print_stats(&info->info, p); | |
259 | p += fas216_print_devices(&info->info, p); | |
260 | ||
261 | *start = buffer + offset; | |
262 | pos = p - buffer - offset; | |
263 | if (pos > length) | |
264 | pos = length; | |
265 | ||
266 | return pos; | |
267 | } | |
268 | ||
10523b3b | 269 | static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
270 | { |
271 | struct expansion_card *ec = ECARD_DEV(dev); | |
272 | struct Scsi_Host *host = ecard_get_drvdata(ec); | |
273 | struct powertec_info *info = (struct powertec_info *)host->hostdata; | |
274 | ||
275 | return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0); | |
276 | } | |
277 | ||
278 | static ssize_t | |
10523b3b | 279 | powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) |
1da177e4 LT |
280 | { |
281 | struct expansion_card *ec = ECARD_DEV(dev); | |
282 | struct Scsi_Host *host = ecard_get_drvdata(ec); | |
283 | ||
284 | if (len > 1) | |
285 | powertecscsi_terminator_ctl(host, buf[0] != '0'); | |
286 | ||
287 | return len; | |
288 | } | |
289 | ||
290 | static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR, | |
291 | powertecscsi_show_term, powertecscsi_store_term); | |
292 | ||
d0be4a7d | 293 | static struct scsi_host_template powertecscsi_template = { |
1da177e4 LT |
294 | .module = THIS_MODULE, |
295 | .proc_info = powertecscsi_proc_info, | |
296 | .name = "PowerTec SCSI", | |
297 | .info = powertecscsi_info, | |
298 | .queuecommand = fas216_queue_command, | |
299 | .eh_host_reset_handler = fas216_eh_host_reset, | |
300 | .eh_bus_reset_handler = fas216_eh_bus_reset, | |
301 | .eh_device_reset_handler = fas216_eh_device_reset, | |
302 | .eh_abort_handler = fas216_eh_abort, | |
303 | ||
304 | .can_queue = 8, | |
305 | .this_id = 7, | |
306 | .sg_tablesize = SG_ALL, | |
307 | .cmd_per_lun = 2, | |
308 | .use_clustering = ENABLE_CLUSTERING, | |
309 | .proc_name = "powertec", | |
310 | }; | |
311 | ||
312 | static int __devinit | |
313 | powertecscsi_probe(struct expansion_card *ec, const struct ecard_id *id) | |
314 | { | |
315 | struct Scsi_Host *host; | |
316 | struct powertec_info *info; | |
317 | unsigned long resbase, reslen; | |
318 | void __iomem *base; | |
319 | int ret; | |
320 | ||
321 | ret = ecard_request_resources(ec); | |
322 | if (ret) | |
323 | goto out; | |
324 | ||
325 | resbase = ecard_resource_start(ec, ECARD_RES_IOCFAST); | |
326 | reslen = ecard_resource_len(ec, ECARD_RES_IOCFAST); | |
327 | base = ioremap(resbase, reslen); | |
328 | if (!base) { | |
329 | ret = -ENOMEM; | |
330 | goto out_region; | |
331 | } | |
332 | ||
333 | host = scsi_host_alloc(&powertecscsi_template, | |
334 | sizeof (struct powertec_info)); | |
335 | if (!host) { | |
336 | ret = -ENOMEM; | |
337 | goto out_unmap; | |
338 | } | |
339 | ||
340 | ecard_set_drvdata(ec, host); | |
341 | ||
342 | info = (struct powertec_info *)host->hostdata; | |
343 | info->base = base; | |
344 | powertecscsi_terminator_ctl(host, term[ec->slot_no]); | |
345 | ||
346 | info->info.scsi.io_base = base + POWERTEC_FAS216_OFFSET; | |
347 | info->info.scsi.io_shift = POWERTEC_FAS216_SHIFT; | |
348 | info->info.scsi.irq = ec->irq; | |
349 | info->info.scsi.dma = ec->dma; | |
350 | info->info.ifcfg.clockrate = 40; /* MHz */ | |
351 | info->info.ifcfg.select_timeout = 255; | |
352 | info->info.ifcfg.asyncperiod = 200; /* ns */ | |
353 | info->info.ifcfg.sync_max_depth = 7; | |
354 | info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK; | |
355 | info->info.ifcfg.disconnect_ok = 1; | |
356 | info->info.ifcfg.wide_max_size = 0; | |
357 | info->info.ifcfg.capabilities = 0; | |
358 | info->info.dma.setup = powertecscsi_dma_setup; | |
359 | info->info.dma.pseudo = NULL; | |
360 | info->info.dma.stop = powertecscsi_dma_stop; | |
361 | ||
362 | ec->irqaddr = base + POWERTEC_INTR_STATUS; | |
363 | ec->irqmask = POWERTEC_INTR_BIT; | |
364 | ec->irq_data = info; | |
365 | ec->ops = &powertecscsi_ops; | |
366 | ||
367 | device_create_file(&ec->dev, &dev_attr_bus_term); | |
368 | ||
369 | ret = fas216_init(host); | |
370 | if (ret) | |
371 | goto out_free; | |
372 | ||
373 | ret = request_irq(ec->irq, powertecscsi_intr, | |
1d6f359a | 374 | IRQF_DISABLED, "powertec", info); |
1da177e4 LT |
375 | if (ret) { |
376 | printk("scsi%d: IRQ%d not free: %d\n", | |
377 | host->host_no, ec->irq, ret); | |
378 | goto out_release; | |
379 | } | |
380 | ||
381 | if (info->info.scsi.dma != NO_DMA) { | |
382 | if (request_dma(info->info.scsi.dma, "powertec")) { | |
383 | printk("scsi%d: DMA%d not free, using PIO\n", | |
384 | host->host_no, info->info.scsi.dma); | |
385 | info->info.scsi.dma = NO_DMA; | |
386 | } else { | |
387 | set_dma_speed(info->info.scsi.dma, 180); | |
388 | info->info.ifcfg.capabilities |= FASCAP_DMA; | |
389 | } | |
390 | } | |
391 | ||
392 | ret = fas216_add(host, &ec->dev); | |
393 | if (ret == 0) | |
394 | goto out; | |
395 | ||
396 | if (info->info.scsi.dma != NO_DMA) | |
397 | free_dma(info->info.scsi.dma); | |
398 | free_irq(ec->irq, host); | |
399 | ||
400 | out_release: | |
401 | fas216_release(host); | |
402 | ||
403 | out_free: | |
404 | device_remove_file(&ec->dev, &dev_attr_bus_term); | |
405 | scsi_host_put(host); | |
406 | ||
407 | out_unmap: | |
408 | iounmap(base); | |
409 | ||
410 | out_region: | |
411 | ecard_release_resources(ec); | |
412 | ||
413 | out: | |
414 | return ret; | |
415 | } | |
416 | ||
417 | static void __devexit powertecscsi_remove(struct expansion_card *ec) | |
418 | { | |
419 | struct Scsi_Host *host = ecard_get_drvdata(ec); | |
420 | struct powertec_info *info = (struct powertec_info *)host->hostdata; | |
421 | ||
422 | ecard_set_drvdata(ec, NULL); | |
423 | fas216_remove(host); | |
424 | ||
425 | device_remove_file(&ec->dev, &dev_attr_bus_term); | |
426 | ||
427 | if (info->info.scsi.dma != NO_DMA) | |
428 | free_dma(info->info.scsi.dma); | |
429 | free_irq(ec->irq, info); | |
430 | ||
431 | iounmap(info->base); | |
432 | ||
433 | fas216_release(host); | |
434 | scsi_host_put(host); | |
435 | ecard_release_resources(ec); | |
436 | } | |
437 | ||
438 | static const struct ecard_id powertecscsi_cids[] = { | |
439 | { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI }, | |
440 | { 0xffff, 0xffff }, | |
441 | }; | |
442 | ||
443 | static struct ecard_driver powertecscsi_driver = { | |
444 | .probe = powertecscsi_probe, | |
445 | .remove = __devexit_p(powertecscsi_remove), | |
446 | .id_table = powertecscsi_cids, | |
447 | .drv = { | |
448 | .name = "powertecscsi", | |
449 | }, | |
450 | }; | |
451 | ||
452 | static int __init powertecscsi_init(void) | |
453 | { | |
454 | return ecard_register_driver(&powertecscsi_driver); | |
455 | } | |
456 | ||
457 | static void __exit powertecscsi_exit(void) | |
458 | { | |
459 | ecard_remove_driver(&powertecscsi_driver); | |
460 | } | |
461 | ||
462 | module_init(powertecscsi_init); | |
463 | module_exit(powertecscsi_exit); | |
464 | ||
465 | MODULE_AUTHOR("Russell King"); | |
466 | MODULE_DESCRIPTION("Powertec SCSI driver"); | |
8d3b33f6 | 467 | module_param_array(term, int, NULL, 0); |
1da177e4 LT |
468 | MODULE_PARM_DESC(term, "SCSI bus termination"); |
469 | MODULE_LICENSE("GPL"); |