1 /*
2 * linux/drivers/acorn/scsi/powertec.c
3 *
4 * Copyright (C) 1997-2003 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 *term_port;
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 writeb(POWERTEC_INTR_ENABLE, ec->irq_data);
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 writeb(POWERTEC_INTR_DISABLE, ec->irq_data);
89 }
90
91 static const expansioncard_ops_t powertecscsi_ops = {
92 .irqenable = powertecscsi_irqenable,
93 .irqdisable = powertecscsi_irqdisable,
94 };
95
96 /* Prototype: void powertecscsi_terminator_ctl(host, on_off)
97 * Purpose : Turn the Powertec SCSI terminators on or off
98 * Params : host - card to turn on/off
99 * : on_off - !0 to turn on, 0 to turn off
100 */
101 static void
102 powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
103 {
104 struct powertec_info *info = (struct powertec_info *)host->hostdata;
105
106 info->term_ctl = on_off ? POWERTEC_TERM_ENABLE : 0;
107 writeb(info->term_ctl, info->term_port);
108 }
109
110 /* Prototype: void powertecscsi_intr(irq, *dev_id, *regs)
111 * Purpose : handle interrupts from Powertec SCSI card
112 * Params : irq - interrupt number
113 * dev_id - user-defined (Scsi_Host structure)
114 * regs - processor registers at interrupt
115 */
116 static irqreturn_t
117 powertecscsi_intr(int irq, void *dev_id, struct pt_regs *regs)
118 {
119 struct powertec_info *info = dev_id;
120
121 return fas216_intr(&info->info);
122 }
123
124 /* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type)
125 * Purpose : initialises DMA/PIO
126 * Params : host - host
127 * SCpnt - command
128 * direction - DMA on to/off of card
129 * min_type - minimum DMA support that we must have for this transfer
130 * Returns : type of transfer to be performed
131 */
132 static fasdmatype_t
133 powertecscsi_dma_setup(struct Scsi_Host *host, Scsi_Pointer *SCp,
134 fasdmadir_t direction, fasdmatype_t min_type)
135 {
136 struct powertec_info *info = (struct powertec_info *)host->hostdata;
137 struct device *dev = scsi_get_device(host);
138 int dmach = host->dma_channel;
139
140 if (info->info.ifcfg.capabilities & FASCAP_DMA &&
141 min_type == fasdma_real_all) {
142 int bufs, map_dir, dma_dir;
143
144 bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
145
146 if (direction == DMA_OUT)
147 map_dir = DMA_TO_DEVICE,
148 dma_dir = DMA_MODE_WRITE;
149 else
150 map_dir = DMA_FROM_DEVICE,
151 dma_dir = DMA_MODE_READ;
152
153 dma_map_sg(dev, info->sg, bufs + 1, map_dir);
154
155 disable_dma(dmach);
156 set_dma_sg(dmach, info->sg, bufs + 1);
157 set_dma_mode(dmach, dma_dir);
158 enable_dma(dmach);
159 return fasdma_real_all;
160 }
161
162 /*
163 * If we're not doing DMA,
164 * we'll do slow PIO
165 */
166 return fasdma_pio;
167 }
168
169 /* Prototype: int powertecscsi_dma_stop(host, SCpnt)
170 * Purpose : stops DMA/PIO
171 * Params : host - host
172 * SCpnt - command
173 */
174 static void
175 powertecscsi_dma_stop(struct Scsi_Host *host, Scsi_Pointer *SCp)
176 {
177 if (host->dma_channel != NO_DMA)
178 disable_dma(host->dma_channel);
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] == '')
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
269 static ssize_t powertecscsi_show_term(struct device *dev, char *buf)
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
279 powertecscsi_store_term(struct device *dev, const char *buf, size_t len)
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] != '');
286
287 return len;
288 }
289
290 static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
291 powertecscsi_show_term, powertecscsi_store_term);
292
293 static Scsi_Host_Template powertecscsi_template = {
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 unsigned char *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 host->base = (unsigned long)base;
341 host->irq = ec->irq;
342 host->dma_channel = ec->dma;
343
344 ec->irqaddr = base + POWERTEC_INTR_STATUS;
345 ec->irqmask = POWERTEC_INTR_BIT;
346 ec->irq_data = base + POWERTEC_INTR_CONTROL;
347 ec->ops = &powertecscsi_ops;
348
349 ecard_set_drvdata(ec, host);
350
351 info = (struct powertec_info *)host->hostdata;
352 info->term_port = base + POWERTEC_TERM_CONTROL;
353 powertecscsi_terminator_ctl(host, term[ec->slot_no]);
354
355 device_create_file(&ec->dev, &dev_attr_bus_term);
356
357 info->info.scsi.io_base = base + POWERTEC_FAS216_OFFSET;
358 info->info.scsi.io_shift = POWERTEC_FAS216_SHIFT;
359 info->info.scsi.irq = host->irq;
360 info->info.ifcfg.clockrate = 40; /* MHz */
361 info->info.ifcfg.select_timeout = 255;
362 info->info.ifcfg.asyncperiod = 200; /* ns */
363 info->info.ifcfg.sync_max_depth = 7;
364 info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
365 info->info.ifcfg.disconnect_ok = 1;
366 info->info.ifcfg.wide_max_size = 0;
367 info->info.ifcfg.capabilities = 0;
368 info->info.dma.setup = powertecscsi_dma_setup;
369 info->info.dma.pseudo = NULL;
370 info->info.dma.stop = powertecscsi_dma_stop;
371
372 ret = fas216_init(host);
373 if (ret)
374 goto out_free;
375
376 ret = request_irq(host->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, host->irq, ret);
381 goto out_release;
382 }
383
384 if (host->dma_channel != NO_DMA) {
385 if (request_dma(host->dma_channel, "powertec")) {
386 printk("scsi%d: DMA%d not free, using PIO\n",
387 host->host_no, host->dma_channel);
388 host->dma_channel = NO_DMA;
389 } else {
390 set_dma_speed(host->dma_channel, 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 (host->dma_channel != NO_DMA)
400 free_dma(host->dma_channel);
401 free_irq(host->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 powertecscsi_info *info = (struct powertecscsi_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 (host->dma_channel != NO_DMA)
431 free_dma(host->dma_channel);
432 free_irq(host->irq, info);
433
434 iounmap((void *)host->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");
473
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