1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/drivers/acorn/scsi/powertec.c
4 *
5 * Copyright (C) 1997-2005 Russell King
6 */
7 #include <linux/module.h>
8 #include <linux/blkdev.h>
9 #include <linux/kernel.h>
10 #include <linux/string.h>
11 #include <linux/ioport.h>
12 #include <linux/proc_fs.h>
13 #include <linux/delay.h>
14 #include <linux/interrupt.h>
15 #include <linux/init.h>
16 #include <linux/dma-mapping.h>
17 #include <linux/pgtable.h>
18
19 #include <asm/dma.h>
20 #include <asm/ecard.h>
21 #include <asm/io.h>
22
23 #include <scsi/scsi.h>
24 #include <scsi/scsi_cmnd.h>
25 #include <scsi/scsi_device.h>
26 #include <scsi/scsi_eh.h>
27 #include <scsi/scsi_host.h>
28 #include <scsi/scsi_tcq.h>
29 #include "fas216.h"
30 #include "arm_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
powertecscsi_irqenable(struct expansion_card * ec,int irqnr)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
powertecscsi_irqdisable(struct expansion_card * ec,int irqnr)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
powertecscsi_terminator_ctl(struct Scsi_Host * host,int on_off)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 */
powertecscsi_intr(int irq,void * dev_id)116 static irqreturn_t powertecscsi_intr(int irq, void *dev_id)
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
powertecscsi_dma_setup(struct Scsi_Host * host,struct scsi_pointer * SCp,fasdmadir_t direction,fasdmatype_t min_type)132 powertecscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
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
153 dma_map_sg(dev, info->sg, bufs, map_dir);
154
155 disable_dma(dmach);
156 set_dma_sg(dmach, info->sg, bufs);
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
powertecscsi_dma_stop(struct Scsi_Host * host,struct scsi_pointer * SCp)175 powertecscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
176 {
177 struct powertec_info *info = (struct powertec_info *)host->hostdata;
178 if (info->info.scsi.dma != NO_DMA)
179 disable_dma(info->info.scsi.dma);
180 }
181
182 /* Prototype: const char *powertecscsi_info(struct Scsi_Host * host)
183 * Purpose : returns a descriptive string about this interface,
184 * Params : host - driver host structure to return info for.
185 * Returns : pointer to a static buffer containing null terminated string.
186 */
powertecscsi_info(struct Scsi_Host * host)187 const char *powertecscsi_info(struct Scsi_Host *host)
188 {
189 struct powertec_info *info = (struct powertec_info *)host->hostdata;
190 static char string[150];
191
192 sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
193 host->hostt->name, info->info.scsi.type, info->ec->slot_no,
194 VERSION, info->term_ctl ? "n" : "ff");
195
196 return string;
197 }
198
199 /* Prototype: int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
200 * Purpose : Set a driver specific function
201 * Params : host - host to setup
202 * : buffer - buffer containing string describing operation
203 * : length - length of string
204 * Returns : -EINVAL, or 0
205 */
206 static int
powertecscsi_set_proc_info(struct Scsi_Host * host,char * buffer,int length)207 powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
208 {
209 int ret = length;
210
211 if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) {
212 buffer += 12;
213 length -= 12;
214
215 if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
216 if (buffer[5] == '1')
217 powertecscsi_terminator_ctl(host, 1);
218 else if (buffer[5] == '0')
219 powertecscsi_terminator_ctl(host, 0);
220 else
221 ret = -EINVAL;
222 } else
223 ret = -EINVAL;
224 } else
225 ret = -EINVAL;
226
227 return ret;
228 }
229
230 /* Prototype: int powertecscsi_proc_info(char *buffer, char **start, off_t offset,
231 * int length, int host_no, int inout)
232 * Purpose : Return information about the driver to a user process accessing
233 * the /proc filesystem.
234 * Params : buffer - a buffer to write information to
235 * start - a pointer into this buffer set by this routine to the start
236 * of the required information.
237 * offset - offset into information that we have read up to.
238 * length - length of buffer
239 * inout - 0 for reading, 1 for writing.
240 * Returns : length of data written to buffer.
241 */
powertecscsi_show_info(struct seq_file * m,struct Scsi_Host * host)242 static int powertecscsi_show_info(struct seq_file *m, struct Scsi_Host *host)
243 {
244 struct powertec_info *info;
245
246 info = (struct powertec_info *)host->hostdata;
247
248 seq_printf(m, "PowerTec SCSI driver v%s\n", VERSION);
249 fas216_print_host(&info->info, m);
250 seq_printf(m, "Term : o%s\n",
251 info->term_ctl ? "n" : "ff");
252
253 fas216_print_stats(&info->info, m);
254 fas216_print_devices(&info->info, m);
255 return 0;
256 }
257
powertecscsi_show_term(struct device * dev,struct device_attribute * attr,char * buf)258 static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf)
259 {
260 struct expansion_card *ec = ECARD_DEV(dev);
261 struct Scsi_Host *host = ecard_get_drvdata(ec);
262 struct powertec_info *info = (struct powertec_info *)host->hostdata;
263
264 return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0);
265 }
266
267 static ssize_t
powertecscsi_store_term(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)268 powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
269 {
270 struct expansion_card *ec = ECARD_DEV(dev);
271 struct Scsi_Host *host = ecard_get_drvdata(ec);
272
273 if (len > 1)
274 powertecscsi_terminator_ctl(host, buf[0] != '0');
275
276 return len;
277 }
278
279 static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
280 powertecscsi_show_term, powertecscsi_store_term);
281
282 static struct scsi_host_template powertecscsi_template = {
283 .module = THIS_MODULE,
284 .show_info = powertecscsi_show_info,
285 .write_info = powertecscsi_set_proc_info,
286 .name = "PowerTec SCSI",
287 .info = powertecscsi_info,
288 .queuecommand = fas216_queue_command,
289 .eh_host_reset_handler = fas216_eh_host_reset,
290 .eh_bus_reset_handler = fas216_eh_bus_reset,
291 .eh_device_reset_handler = fas216_eh_device_reset,
292 .eh_abort_handler = fas216_eh_abort,
293 .cmd_size = sizeof(struct fas216_cmd_priv),
294 .can_queue = 8,
295 .this_id = 7,
296 .sg_tablesize = SG_MAX_SEGMENTS,
297 .dma_boundary = IOMD_DMA_BOUNDARY,
298 .cmd_per_lun = 2,
299 .proc_name = "powertec",
300 };
301
powertecscsi_probe(struct expansion_card * ec,const struct ecard_id * id)302 static int powertecscsi_probe(struct expansion_card *ec,
303 const struct ecard_id *id)
304 {
305 struct Scsi_Host *host;
306 struct powertec_info *info;
307 void __iomem *base;
308 int ret;
309
310 ret = ecard_request_resources(ec);
311 if (ret)
312 goto out;
313
314 base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
315 if (!base) {
316 ret = -ENOMEM;
317 goto out_region;
318 }
319
320 host = scsi_host_alloc(&powertecscsi_template,
321 sizeof (struct powertec_info));
322 if (!host) {
323 ret = -ENOMEM;
324 goto out_region;
325 }
326
327 ecard_set_drvdata(ec, host);
328
329 info = (struct powertec_info *)host->hostdata;
330 info->base = base;
331 powertecscsi_terminator_ctl(host, term[ec->slot_no]);
332
333 info->ec = ec;
334 info->info.scsi.io_base = base + POWERTEC_FAS216_OFFSET;
335 info->info.scsi.io_shift = POWERTEC_FAS216_SHIFT;
336 info->info.scsi.irq = ec->irq;
337 info->info.scsi.dma = ec->dma;
338 info->info.ifcfg.clockrate = 40; /* MHz */
339 info->info.ifcfg.select_timeout = 255;
340 info->info.ifcfg.asyncperiod = 200; /* ns */
341 info->info.ifcfg.sync_max_depth = 7;
342 info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
343 info->info.ifcfg.disconnect_ok = 1;
344 info->info.ifcfg.wide_max_size = 0;
345 info->info.ifcfg.capabilities = 0;
346 info->info.dma.setup = powertecscsi_dma_setup;
347 info->info.dma.pseudo = NULL;
348 info->info.dma.stop = powertecscsi_dma_stop;
349
350 ec->irqaddr = base + POWERTEC_INTR_STATUS;
351 ec->irqmask = POWERTEC_INTR_BIT;
352
353 ecard_setirq(ec, &powertecscsi_ops, info);
354
355 device_create_file(&ec->dev, &dev_attr_bus_term);
356
357 ret = fas216_init(host);
358 if (ret)
359 goto out_free;
360
361 ret = request_irq(ec->irq, powertecscsi_intr,
362 0, "powertec", info);
363 if (ret) {
364 printk("scsi%d: IRQ%d not free: %d\n",
365 host->host_no, ec->irq, ret);
366 goto out_release;
367 }
368
369 if (info->info.scsi.dma != NO_DMA) {
370 if (request_dma(info->info.scsi.dma, "powertec")) {
371 printk("scsi%d: DMA%d not free, using PIO\n",
372 host->host_no, info->info.scsi.dma);
373 info->info.scsi.dma = NO_DMA;
374 } else {
375 set_dma_speed(info->info.scsi.dma, 180);
376 info->info.ifcfg.capabilities |= FASCAP_DMA;
377 }
378 }
379
380 ret = fas216_add(host, &ec->dev);
381 if (ret == 0)
382 goto out;
383
384 if (info->info.scsi.dma != NO_DMA)
385 free_dma(info->info.scsi.dma);
386 free_irq(ec->irq, info);
387
388 out_release:
389 fas216_release(host);
390
391 out_free:
392 device_remove_file(&ec->dev, &dev_attr_bus_term);
393 scsi_host_put(host);
394
395 out_region:
396 ecard_release_resources(ec);
397
398 out:
399 return ret;
400 }
401
powertecscsi_remove(struct expansion_card * ec)402 static void powertecscsi_remove(struct expansion_card *ec)
403 {
404 struct Scsi_Host *host = ecard_get_drvdata(ec);
405 struct powertec_info *info = (struct powertec_info *)host->hostdata;
406
407 ecard_set_drvdata(ec, NULL);
408 fas216_remove(host);
409
410 device_remove_file(&ec->dev, &dev_attr_bus_term);
411
412 if (info->info.scsi.dma != NO_DMA)
413 free_dma(info->info.scsi.dma);
414 free_irq(ec->irq, info);
415
416 fas216_release(host);
417 scsi_host_put(host);
418 ecard_release_resources(ec);
419 }
420
421 static const struct ecard_id powertecscsi_cids[] = {
422 { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI },
423 { 0xffff, 0xffff },
424 };
425
426 static struct ecard_driver powertecscsi_driver = {
427 .probe = powertecscsi_probe,
428 .remove = powertecscsi_remove,
429 .id_table = powertecscsi_cids,
430 .drv = {
431 .name = "powertecscsi",
432 },
433 };
434
powertecscsi_init(void)435 static int __init powertecscsi_init(void)
436 {
437 return ecard_register_driver(&powertecscsi_driver);
438 }
439
powertecscsi_exit(void)440 static void __exit powertecscsi_exit(void)
441 {
442 ecard_remove_driver(&powertecscsi_driver);
443 }
444
445 module_init(powertecscsi_init);
446 module_exit(powertecscsi_exit);
447
448 MODULE_AUTHOR("Russell King");
449 MODULE_DESCRIPTION("Powertec SCSI driver");
450 module_param_array(term, int, NULL, 0);
451 MODULE_PARM_DESC(term, "SCSI bus termination");
452 MODULE_LICENSE("GPL");
453
