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