pcmcia: CompactFlash driver for PA Semi Electra boards
[pv_ops_mirror.git] / drivers / scsi / arm / powertec.c
blobd9a546d1917ce560435084bde443325f47cb22be
1 /*
2 * linux/drivers/acorn/scsi/powertec.c
4 * Copyright (C) 1997-2005 Russell King
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/proc_fs.h>
16 #include <linux/delay.h>
17 #include <linux/interrupt.h>
18 #include <linux/init.h>
19 #include <linux/dma-mapping.h>
21 #include <asm/dma.h>
22 #include <asm/ecard.h>
23 #include <asm/io.h>
24 #include <asm/pgtable.h>
26 #include "../scsi.h"
27 #include <scsi/scsi_host.h>
28 #include "fas216.h"
29 #include "scsi.h"
31 #include <scsi/scsicam.h>
33 #define POWERTEC_FAS216_OFFSET 0x3000
34 #define POWERTEC_FAS216_SHIFT 6
36 #define POWERTEC_INTR_STATUS 0x2000
37 #define POWERTEC_INTR_BIT 0x80
39 #define POWERTEC_RESET_CONTROL 0x1018
40 #define POWERTEC_RESET_BIT 1
42 #define POWERTEC_TERM_CONTROL 0x2018
43 #define POWERTEC_TERM_ENABLE 1
45 #define POWERTEC_INTR_CONTROL 0x101c
46 #define POWERTEC_INTR_ENABLE 1
47 #define POWERTEC_INTR_DISABLE 0
49 #define VERSION "1.10 (19/01/2003 2.5.59)"
52 * Use term=0,1,0,0,0 to turn terminators on/off.
53 * One entry per slot.
55 static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
57 #define NR_SG 256
59 struct powertec_info {
60 FAS216_Info info;
61 struct expansion_card *ec;
62 void __iomem *base;
63 unsigned int term_ctl;
64 struct scatterlist sg[NR_SG];
67 /* Prototype: void powertecscsi_irqenable(ec, irqnr)
68 * Purpose : Enable interrupts on Powertec SCSI card
69 * Params : ec - expansion card structure
70 * : irqnr - interrupt number
72 static void
73 powertecscsi_irqenable(struct expansion_card *ec, int irqnr)
75 struct powertec_info *info = ec->irq_data;
76 writeb(POWERTEC_INTR_ENABLE, info->base + POWERTEC_INTR_CONTROL);
79 /* Prototype: void powertecscsi_irqdisable(ec, irqnr)
80 * Purpose : Disable interrupts on Powertec SCSI card
81 * Params : ec - expansion card structure
82 * : irqnr - interrupt number
84 static void
85 powertecscsi_irqdisable(struct expansion_card *ec, int irqnr)
87 struct powertec_info *info = ec->irq_data;
88 writeb(POWERTEC_INTR_DISABLE, info->base + POWERTEC_INTR_CONTROL);
91 static const expansioncard_ops_t powertecscsi_ops = {
92 .irqenable = powertecscsi_irqenable,
93 .irqdisable = powertecscsi_irqdisable,
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
101 static void
102 powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
104 struct powertec_info *info = (struct powertec_info *)host->hostdata;
106 info->term_ctl = on_off ? POWERTEC_TERM_ENABLE : 0;
107 writeb(info->term_ctl, info->base + POWERTEC_TERM_CONTROL);
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)
115 static irqreturn_t powertecscsi_intr(int irq, void *dev_id)
117 struct powertec_info *info = dev_id;
119 return fas216_intr(&info->info);
122 /* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type)
123 * Purpose : initialises DMA/PIO
124 * Params : host - host
125 * SCpnt - command
126 * direction - DMA on to/off of card
127 * min_type - minimum DMA support that we must have for this transfer
128 * Returns : type of transfer to be performed
130 static fasdmatype_t
131 powertecscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
132 fasdmadir_t direction, fasdmatype_t min_type)
134 struct powertec_info *info = (struct powertec_info *)host->hostdata;
135 struct device *dev = scsi_get_device(host);
136 int dmach = info->info.scsi.dma;
138 if (info->info.ifcfg.capabilities & FASCAP_DMA &&
139 min_type == fasdma_real_all) {
140 int bufs, map_dir, dma_dir;
142 bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
144 if (direction == DMA_OUT)
145 map_dir = DMA_TO_DEVICE,
146 dma_dir = DMA_MODE_WRITE;
147 else
148 map_dir = DMA_FROM_DEVICE,
149 dma_dir = DMA_MODE_READ;
151 dma_map_sg(dev, info->sg, bufs, map_dir);
153 disable_dma(dmach);
154 set_dma_sg(dmach, info->sg, bufs);
155 set_dma_mode(dmach, dma_dir);
156 enable_dma(dmach);
157 return fasdma_real_all;
161 * If we're not doing DMA,
162 * we'll do slow PIO
164 return fasdma_pio;
167 /* Prototype: int powertecscsi_dma_stop(host, SCpnt)
168 * Purpose : stops DMA/PIO
169 * Params : host - host
170 * SCpnt - command
172 static void
173 powertecscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
175 struct powertec_info *info = (struct powertec_info *)host->hostdata;
176 if (info->info.scsi.dma != NO_DMA)
177 disable_dma(info->info.scsi.dma);
180 /* Prototype: const char *powertecscsi_info(struct Scsi_Host * host)
181 * Purpose : returns a descriptive string about this interface,
182 * Params : host - driver host structure to return info for.
183 * Returns : pointer to a static buffer containing null terminated string.
185 const char *powertecscsi_info(struct Scsi_Host *host)
187 struct powertec_info *info = (struct powertec_info *)host->hostdata;
188 static char string[150];
190 sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
191 host->hostt->name, info->info.scsi.type, info->ec->slot_no,
192 VERSION, info->term_ctl ? "n" : "ff");
194 return string;
197 /* Prototype: int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
198 * Purpose : Set a driver specific function
199 * Params : host - host to setup
200 * : buffer - buffer containing string describing operation
201 * : length - length of string
202 * Returns : -EINVAL, or 0
204 static int
205 powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
207 int ret = length;
209 if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) {
210 buffer += 12;
211 length -= 12;
213 if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
214 if (buffer[5] == '1')
215 powertecscsi_terminator_ctl(host, 1);
216 else if (buffer[5] == '0')
217 powertecscsi_terminator_ctl(host, 0);
218 else
219 ret = -EINVAL;
220 } else
221 ret = -EINVAL;
222 } else
223 ret = -EINVAL;
225 return ret;
228 /* Prototype: int powertecscsi_proc_info(char *buffer, char **start, off_t offset,
229 * int length, int host_no, int inout)
230 * Purpose : Return information about the driver to a user process accessing
231 * the /proc filesystem.
232 * Params : buffer - a buffer to write information to
233 * start - a pointer into this buffer set by this routine to the start
234 * of the required information.
235 * offset - offset into information that we have read upto.
236 * length - length of buffer
237 * inout - 0 for reading, 1 for writing.
238 * Returns : length of data written to buffer.
240 int powertecscsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
241 int length, int inout)
243 struct powertec_info *info;
244 char *p = buffer;
245 int pos;
247 if (inout == 1)
248 return powertecscsi_set_proc_info(host, buffer, length);
250 info = (struct powertec_info *)host->hostdata;
252 p += sprintf(p, "PowerTec SCSI driver v%s\n", VERSION);
253 p += fas216_print_host(&info->info, p);
254 p += sprintf(p, "Term : o%s\n",
255 info->term_ctl ? "n" : "ff");
257 p += fas216_print_stats(&info->info, p);
258 p += fas216_print_devices(&info->info, p);
260 *start = buffer + offset;
261 pos = p - buffer - offset;
262 if (pos > length)
263 pos = length;
265 return pos;
268 static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf)
270 struct expansion_card *ec = ECARD_DEV(dev);
271 struct Scsi_Host *host = ecard_get_drvdata(ec);
272 struct powertec_info *info = (struct powertec_info *)host->hostdata;
274 return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0);
277 static ssize_t
278 powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
280 struct expansion_card *ec = ECARD_DEV(dev);
281 struct Scsi_Host *host = ecard_get_drvdata(ec);
283 if (len > 1)
284 powertecscsi_terminator_ctl(host, buf[0] != '0');
286 return len;
289 static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
290 powertecscsi_show_term, powertecscsi_store_term);
292 static struct scsi_host_template powertecscsi_template = {
293 .module = THIS_MODULE,
294 .proc_info = powertecscsi_proc_info,
295 .name = "PowerTec SCSI",
296 .info = powertecscsi_info,
297 .queuecommand = fas216_queue_command,
298 .eh_host_reset_handler = fas216_eh_host_reset,
299 .eh_bus_reset_handler = fas216_eh_bus_reset,
300 .eh_device_reset_handler = fas216_eh_device_reset,
301 .eh_abort_handler = fas216_eh_abort,
303 .can_queue = 8,
304 .this_id = 7,
305 .sg_tablesize = SG_ALL,
306 .cmd_per_lun = 2,
307 .use_clustering = ENABLE_CLUSTERING,
308 .proc_name = "powertec",
311 static int __devinit
312 powertecscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
314 struct Scsi_Host *host;
315 struct powertec_info *info;
316 void __iomem *base;
317 int ret;
319 ret = ecard_request_resources(ec);
320 if (ret)
321 goto out;
323 base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
324 if (!base) {
325 ret = -ENOMEM;
326 goto out_region;
329 host = scsi_host_alloc(&powertecscsi_template,
330 sizeof (struct powertec_info));
331 if (!host) {
332 ret = -ENOMEM;
333 goto out_region;
336 ecard_set_drvdata(ec, host);
338 info = (struct powertec_info *)host->hostdata;
339 info->base = base;
340 powertecscsi_terminator_ctl(host, term[ec->slot_no]);
342 info->ec = ec;
343 info->info.scsi.io_base = base + POWERTEC_FAS216_OFFSET;
344 info->info.scsi.io_shift = POWERTEC_FAS216_SHIFT;
345 info->info.scsi.irq = ec->irq;
346 info->info.scsi.dma = ec->dma;
347 info->info.ifcfg.clockrate = 40; /* MHz */
348 info->info.ifcfg.select_timeout = 255;
349 info->info.ifcfg.asyncperiod = 200; /* ns */
350 info->info.ifcfg.sync_max_depth = 7;
351 info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
352 info->info.ifcfg.disconnect_ok = 1;
353 info->info.ifcfg.wide_max_size = 0;
354 info->info.ifcfg.capabilities = 0;
355 info->info.dma.setup = powertecscsi_dma_setup;
356 info->info.dma.pseudo = NULL;
357 info->info.dma.stop = powertecscsi_dma_stop;
359 ec->irqaddr = base + POWERTEC_INTR_STATUS;
360 ec->irqmask = POWERTEC_INTR_BIT;
362 ecard_setirq(ec, &powertecscsi_ops, info);
364 device_create_file(&ec->dev, &dev_attr_bus_term);
366 ret = fas216_init(host);
367 if (ret)
368 goto out_free;
370 ret = request_irq(ec->irq, powertecscsi_intr,
371 IRQF_DISABLED, "powertec", info);
372 if (ret) {
373 printk("scsi%d: IRQ%d not free: %d\n",
374 host->host_no, ec->irq, ret);
375 goto out_release;
378 if (info->info.scsi.dma != NO_DMA) {
379 if (request_dma(info->info.scsi.dma, "powertec")) {
380 printk("scsi%d: DMA%d not free, using PIO\n",
381 host->host_no, info->info.scsi.dma);
382 info->info.scsi.dma = NO_DMA;
383 } else {
384 set_dma_speed(info->info.scsi.dma, 180);
385 info->info.ifcfg.capabilities |= FASCAP_DMA;
389 ret = fas216_add(host, &ec->dev);
390 if (ret == 0)
391 goto out;
393 if (info->info.scsi.dma != NO_DMA)
394 free_dma(info->info.scsi.dma);
395 free_irq(ec->irq, host);
397 out_release:
398 fas216_release(host);
400 out_free:
401 device_remove_file(&ec->dev, &dev_attr_bus_term);
402 scsi_host_put(host);
404 out_region:
405 ecard_release_resources(ec);
407 out:
408 return ret;
411 static void __devexit powertecscsi_remove(struct expansion_card *ec)
413 struct Scsi_Host *host = ecard_get_drvdata(ec);
414 struct powertec_info *info = (struct powertec_info *)host->hostdata;
416 ecard_set_drvdata(ec, NULL);
417 fas216_remove(host);
419 device_remove_file(&ec->dev, &dev_attr_bus_term);
421 if (info->info.scsi.dma != NO_DMA)
422 free_dma(info->info.scsi.dma);
423 free_irq(ec->irq, info);
425 fas216_release(host);
426 scsi_host_put(host);
427 ecard_release_resources(ec);
430 static const struct ecard_id powertecscsi_cids[] = {
431 { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI },
432 { 0xffff, 0xffff },
435 static struct ecard_driver powertecscsi_driver = {
436 .probe = powertecscsi_probe,
437 .remove = __devexit_p(powertecscsi_remove),
438 .id_table = powertecscsi_cids,
439 .drv = {
440 .name = "powertecscsi",
444 static int __init powertecscsi_init(void)
446 return ecard_register_driver(&powertecscsi_driver);
449 static void __exit powertecscsi_exit(void)
451 ecard_remove_driver(&powertecscsi_driver);
454 module_init(powertecscsi_init);
455 module_exit(powertecscsi_exit);
457 MODULE_AUTHOR("Russell King");
458 MODULE_DESCRIPTION("Powertec SCSI driver");
459 module_param_array(term, int, NULL, 0);
460 MODULE_PARM_DESC(term, "SCSI bus termination");
461 MODULE_LICENSE("GPL");