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.
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>
23 #include <asm/ecard.h>
25 #include <asm/pgtable.h>
28 #include <scsi/scsi_host.h>
32 #include <scsi/scsicam.h>
34 #define POWERTEC_FAS216_OFFSET 0x3000
35 #define POWERTEC_FAS216_SHIFT 6
37 #define POWERTEC_INTR_STATUS 0x2000
38 #define POWERTEC_INTR_BIT 0x80
40 #define POWERTEC_RESET_CONTROL 0x1018
41 #define POWERTEC_RESET_BIT 1
43 #define POWERTEC_TERM_CONTROL 0x2018
44 #define POWERTEC_TERM_ENABLE 1
46 #define POWERTEC_INTR_CONTROL 0x101c
47 #define POWERTEC_INTR_ENABLE 1
48 #define POWERTEC_INTR_DISABLE 0
50 #define VERSION "1.10 (19/01/2003 2.5.59)"
53 * Use term=0,1,0,0,0 to turn terminators on/off.
56 static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
60 struct powertec_info {
62 struct expansion_card *ec;
64 unsigned int term_ctl;
65 struct scatterlist sg[NR_SG];
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
74 powertecscsi_irqenable(struct expansion_card *ec, int irqnr)
76 struct powertec_info *info = ec->irq_data;
77 writeb(POWERTEC_INTR_ENABLE, info->base + POWERTEC_INTR_CONTROL);
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
86 powertecscsi_irqdisable(struct expansion_card *ec, int irqnr)
88 struct powertec_info *info = ec->irq_data;
89 writeb(POWERTEC_INTR_DISABLE, info->base + POWERTEC_INTR_CONTROL);
92 static const expansioncard_ops_t powertecscsi_ops = {
93 .irqenable = powertecscsi_irqenable,
94 .irqdisable = powertecscsi_irqdisable,
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
103 powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
105 struct powertec_info *info = (struct powertec_info *)host->hostdata;
107 info->term_ctl = on_off ? POWERTEC_TERM_ENABLE : 0;
108 writeb(info->term_ctl, info->base + POWERTEC_TERM_CONTROL);
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
118 powertecscsi_intr(int irq, void *dev_id, struct pt_regs *regs)
120 struct powertec_info *info = dev_id;
122 return fas216_intr(&info->info);
125 /* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type)
126 * Purpose : initialises DMA/PIO
127 * Params : host - host
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
134 powertecscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
135 fasdmadir_t direction, fasdmatype_t min_type)
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;
141 if (info->info.ifcfg.capabilities & FASCAP_DMA &&
142 min_type == fasdma_real_all) {
143 int bufs, map_dir, dma_dir;
145 bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
147 if (direction == DMA_OUT)
148 map_dir = DMA_TO_DEVICE,
149 dma_dir = DMA_MODE_WRITE;
151 map_dir = DMA_FROM_DEVICE,
152 dma_dir = DMA_MODE_READ;
154 dma_map_sg(dev, info->sg, bufs + 1, map_dir);
157 set_dma_sg(dmach, info->sg, bufs + 1);
158 set_dma_mode(dmach, dma_dir);
160 return fasdma_real_all;
164 * If we're not doing DMA,
170 /* Prototype: int powertecscsi_dma_stop(host, SCpnt)
171 * Purpose : stops DMA/PIO
172 * Params : host - host
176 powertecscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
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);
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.
188 const char *powertecscsi_info(struct Scsi_Host *host)
190 struct powertec_info *info = (struct powertec_info *)host->hostdata;
191 static char string[150];
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");
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
208 powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
212 if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) {
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);
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.
243 int powertecscsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
244 int length, int inout)
246 struct powertec_info *info;
251 return powertecscsi_set_proc_info(host, buffer, length);
253 info = (struct powertec_info *)host->hostdata;
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");
260 p += fas216_print_stats(&info->info, p);
261 p += fas216_print_devices(&info->info, p);
263 *start = buffer + offset;
264 pos = p - buffer - offset;
271 static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf)
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;
277 return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0);
281 powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
283 struct expansion_card *ec = ECARD_DEV(dev);
284 struct Scsi_Host *host = ecard_get_drvdata(ec);
287 powertecscsi_terminator_ctl(host, buf[0] != '0');
292 static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
293 powertecscsi_show_term, powertecscsi_store_term);
295 static struct scsi_host_template powertecscsi_template = {
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,
308 .sg_tablesize = SG_ALL,
310 .use_clustering = ENABLE_CLUSTERING,
311 .proc_name = "powertec",
315 powertecscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
317 struct Scsi_Host *host;
318 struct powertec_info *info;
319 unsigned long resbase, reslen;
323 ret = ecard_request_resources(ec);
327 resbase = ecard_resource_start(ec, ECARD_RES_IOCFAST);
328 reslen = ecard_resource_len(ec, ECARD_RES_IOCFAST);
329 base = ioremap(resbase, reslen);
335 host = scsi_host_alloc(&powertecscsi_template,
336 sizeof (struct powertec_info));
342 ecard_set_drvdata(ec, host);
344 info = (struct powertec_info *)host->hostdata;
346 powertecscsi_terminator_ctl(host, term[ec->slot_no]);
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;
364 ec->irqaddr = base + POWERTEC_INTR_STATUS;
365 ec->irqmask = POWERTEC_INTR_BIT;
367 ec->ops = &powertecscsi_ops;
369 device_create_file(&ec->dev, &dev_attr_bus_term);
371 ret = fas216_init(host);
375 ret = request_irq(ec->irq, powertecscsi_intr,
376 SA_INTERRUPT, "powertec", info);
378 printk("scsi%d: IRQ%d not free: %d\n",
379 host->host_no, ec->irq, ret);
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;
389 set_dma_speed(info->info.scsi.dma, 180);
390 info->info.ifcfg.capabilities |= FASCAP_DMA;
394 ret = fas216_add(host, &ec->dev);
398 if (info->info.scsi.dma != NO_DMA)
399 free_dma(info->info.scsi.dma);
400 free_irq(ec->irq, host);
403 fas216_release(host);
406 device_remove_file(&ec->dev, &dev_attr_bus_term);
413 ecard_release_resources(ec);
419 static void __devexit powertecscsi_remove(struct expansion_card *ec)
421 struct Scsi_Host *host = ecard_get_drvdata(ec);
422 struct powertec_info *info = (struct powertec_info *)host->hostdata;
424 ecard_set_drvdata(ec, NULL);
427 device_remove_file(&ec->dev, &dev_attr_bus_term);
429 if (info->info.scsi.dma != NO_DMA)
430 free_dma(info->info.scsi.dma);
431 free_irq(ec->irq, info);
435 fas216_release(host);
437 ecard_release_resources(ec);
440 static const struct ecard_id powertecscsi_cids[] = {
441 { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI },
445 static struct ecard_driver powertecscsi_driver = {
446 .probe = powertecscsi_probe,
447 .remove = __devexit_p(powertecscsi_remove),
448 .id_table = powertecscsi_cids,
450 .name = "powertecscsi",
454 static int __init powertecscsi_init(void)
456 return ecard_register_driver(&powertecscsi_driver);
459 static void __exit powertecscsi_exit(void)
461 ecard_remove_driver(&powertecscsi_driver);
464 module_init(powertecscsi_init);
465 module_exit(powertecscsi_exit);
467 MODULE_AUTHOR("Russell King");
468 MODULE_DESCRIPTION("Powertec SCSI driver");
469 module_param_array(term, int, NULL, 0);
470 MODULE_PARM_DESC(term, "SCSI bus termination");
471 MODULE_LICENSE("GPL");