1/*
2 *  linux/drivers/acorn/scsi/powertec.c
3 *
4 *  Copyright (C) 1997-2005 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/proc_fs.h>
16#include <linux/delay.h>
17#include <linux/interrupt.h>
18#include <linux/init.h>
19#include <linux/dma-mapping.h>
20
21#include <asm/dma.h>
22#include <asm/ecard.h>
23#include <asm/io.h>
24#include <asm/pgtable.h>
25
26#include "../scsi.h"
27#include <scsi/scsi_host.h>
28#include "fas216.h"
29#include "scsi.h"
30
31#include <scsi/scsicam.h>
32
33#define POWERTEC_FAS216_OFFSET	0x3000
34#define POWERTEC_FAS216_SHIFT	6
35
36#define POWERTEC_INTR_STATUS	0x2000
37#define POWERTEC_INTR_BIT	0x80
38
39#define POWERTEC_RESET_CONTROL	0x1018
40#define POWERTEC_RESET_BIT	1
41
42#define POWERTEC_TERM_CONTROL	0x2018
43#define POWERTEC_TERM_ENABLE	1
44
45#define POWERTEC_INTR_CONTROL	0x101c
46#define POWERTEC_INTR_ENABLE	1
47#define POWERTEC_INTR_DISABLE	0
48
49#define VERSION	"1.10 (19/01/2003 2.5.59)"
50
51/*
52 * Use term=0,1,0,0,0 to turn terminators on/off.
53 * One entry per slot.
54 */
55static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
56
57#define NR_SG	256
58
59struct 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];
65};
66
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
71 */
72static void
73powertecscsi_irqenable(struct expansion_card *ec, int irqnr)
74{
75	struct powertec_info *info = ec->irq_data;
76	writeb(POWERTEC_INTR_ENABLE, info->base + POWERTEC_INTR_CONTROL);
77}
78
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
83 */
84static void
85powertecscsi_irqdisable(struct expansion_card *ec, int irqnr)
86{
87	struct powertec_info *info = ec->irq_data;
88	writeb(POWERTEC_INTR_DISABLE, info->base + POWERTEC_INTR_CONTROL);
89}
90
91static 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 */
101static void
102powertecscsi_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->base + POWERTEC_TERM_CONTROL);
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 */
115static irqreturn_t powertecscsi_intr(int irq, void *dev_id)
116{
117	struct powertec_info *info = dev_id;
118
119	return fas216_intr(&info->info);
120}
121
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
129 */
130static fasdmatype_t
131powertecscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
132		       fasdmadir_t direction, fasdmatype_t min_type)
133{
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;
137
138	if (info->info.ifcfg.capabilities & FASCAP_DMA &&
139	    min_type == fasdma_real_all) {
140		int bufs, map_dir, dma_dir;
141
142		bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
143
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;
150
151		dma_map_sg(dev, info->sg, bufs, map_dir);
152
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;
158	}
159
160	/*
161	 * If we're not doing DMA,
162	 *  we'll do slow PIO
163	 */
164	return fasdma_pio;
165}
166
167/* Prototype: int powertecscsi_dma_stop(host, SCpnt)
168 * Purpose  : stops DMA/PIO
169 * Params   : host  - host
170 *	      SCpnt - command
171 */
172static void
173powertecscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
174{
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);
178}
179
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.
184 */
185const char *powertecscsi_info(struct Scsi_Host *host)
186{
187	struct powertec_info *info = (struct powertec_info *)host->hostdata;
188	static char string[150];
189
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");
193
194	return string;
195}
196
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
203 */
204static int
205powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
206{
207	int ret = length;
208
209	if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) {
210		buffer += 12;
211		length -= 12;
212
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;
224
225	return ret;
226}
227
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 up to.
236 *	      length  - length of buffer
237 *	      inout   - 0 for reading, 1 for writing.
238 * Returns  : length of data written to buffer.
239 */
240static int powertecscsi_show_info(struct seq_file *m, struct Scsi_Host *host)
241{
242	struct powertec_info *info;
243
244	info = (struct powertec_info *)host->hostdata;
245
246	seq_printf(m, "PowerTec SCSI driver v%s\n", VERSION);
247	fas216_print_host(&info->info, m);
248	seq_printf(m, "Term    : o%s\n",
249			info->term_ctl ? "n" : "ff");
250
251	fas216_print_stats(&info->info, m);
252	fas216_print_devices(&info->info, m);
253	return 0;
254}
255
256static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf)
257{
258	struct expansion_card *ec = ECARD_DEV(dev);
259	struct Scsi_Host *host = ecard_get_drvdata(ec);
260	struct powertec_info *info = (struct powertec_info *)host->hostdata;
261
262	return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0);
263}
264
265static ssize_t
266powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
267{
268	struct expansion_card *ec = ECARD_DEV(dev);
269	struct Scsi_Host *host = ecard_get_drvdata(ec);
270
271	if (len > 1)
272		powertecscsi_terminator_ctl(host, buf[0] != '0');
273
274	return len;
275}
276
277static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
278		   powertecscsi_show_term, powertecscsi_store_term);
279
280static struct scsi_host_template powertecscsi_template = {
281	.module				= THIS_MODULE,
282	.show_info			= powertecscsi_show_info,
283	.write_info			= powertecscsi_set_proc_info,
284	.name				= "PowerTec SCSI",
285	.info				= powertecscsi_info,
286	.queuecommand			= fas216_queue_command,
287	.eh_host_reset_handler		= fas216_eh_host_reset,
288	.eh_bus_reset_handler		= fas216_eh_bus_reset,
289	.eh_device_reset_handler	= fas216_eh_device_reset,
290	.eh_abort_handler		= fas216_eh_abort,
291
292	.can_queue			= 8,
293	.this_id			= 7,
294	.sg_tablesize			= SCSI_MAX_SG_CHAIN_SEGMENTS,
295	.dma_boundary			= IOMD_DMA_BOUNDARY,
296	.cmd_per_lun			= 2,
297	.use_clustering			= ENABLE_CLUSTERING,
298	.proc_name			= "powertec",
299};
300
301static int powertecscsi_probe(struct expansion_card *ec,
302			      const struct ecard_id *id)
303{
304	struct Scsi_Host *host;
305	struct powertec_info *info;
306	void __iomem *base;
307	int ret;
308
309	ret = ecard_request_resources(ec);
310	if (ret)
311		goto out;
312
313	base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
314	if (!base) {
315		ret = -ENOMEM;
316		goto out_region;
317	}
318
319	host = scsi_host_alloc(&powertecscsi_template,
320			       sizeof (struct powertec_info));
321	if (!host) {
322		ret = -ENOMEM;
323		goto out_region;
324	}
325
326	ecard_set_drvdata(ec, host);
327
328	info = (struct powertec_info *)host->hostdata;
329	info->base = base;
330	powertecscsi_terminator_ctl(host, term[ec->slot_no]);
331
332	info->ec = ec;
333	info->info.scsi.io_base		= base + POWERTEC_FAS216_OFFSET;
334	info->info.scsi.io_shift	= POWERTEC_FAS216_SHIFT;
335	info->info.scsi.irq		= ec->irq;
336	info->info.scsi.dma		= ec->dma;
337	info->info.ifcfg.clockrate	= 40; /* MHz */
338	info->info.ifcfg.select_timeout	= 255;
339	info->info.ifcfg.asyncperiod	= 200; /* ns */
340	info->info.ifcfg.sync_max_depth	= 7;
341	info->info.ifcfg.cntl3		= CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
342	info->info.ifcfg.disconnect_ok	= 1;
343	info->info.ifcfg.wide_max_size	= 0;
344	info->info.ifcfg.capabilities	= 0;
345	info->info.dma.setup		= powertecscsi_dma_setup;
346	info->info.dma.pseudo		= NULL;
347	info->info.dma.stop		= powertecscsi_dma_stop;
348
349	ec->irqaddr	= base + POWERTEC_INTR_STATUS;
350	ec->irqmask	= POWERTEC_INTR_BIT;
351
352	ecard_setirq(ec, &powertecscsi_ops, info);
353
354	device_create_file(&ec->dev, &dev_attr_bus_term);
355
356	ret = fas216_init(host);
357	if (ret)
358		goto out_free;
359
360	ret = request_irq(ec->irq, powertecscsi_intr,
361			  0, "powertec", info);
362	if (ret) {
363		printk("scsi%d: IRQ%d not free: %d\n",
364		       host->host_no, ec->irq, ret);
365		goto out_release;
366	}
367
368	if (info->info.scsi.dma != NO_DMA) {
369		if (request_dma(info->info.scsi.dma, "powertec")) {
370			printk("scsi%d: DMA%d not free, using PIO\n",
371			       host->host_no, info->info.scsi.dma);
372			info->info.scsi.dma = NO_DMA;
373		} else {
374			set_dma_speed(info->info.scsi.dma, 180);
375			info->info.ifcfg.capabilities |= FASCAP_DMA;
376		}
377	}
378
379	ret = fas216_add(host, &ec->dev);
380	if (ret == 0)
381		goto out;
382
383	if (info->info.scsi.dma != NO_DMA)
384		free_dma(info->info.scsi.dma);
385	free_irq(ec->irq, host);
386
387 out_release:
388	fas216_release(host);
389
390 out_free:
391	device_remove_file(&ec->dev, &dev_attr_bus_term);
392	scsi_host_put(host);
393
394 out_region:
395	ecard_release_resources(ec);
396
397 out:
398	return ret;
399}
400
401static void powertecscsi_remove(struct expansion_card *ec)
402{
403	struct Scsi_Host *host = ecard_get_drvdata(ec);
404	struct powertec_info *info = (struct powertec_info *)host->hostdata;
405
406	ecard_set_drvdata(ec, NULL);
407	fas216_remove(host);
408
409	device_remove_file(&ec->dev, &dev_attr_bus_term);
410
411	if (info->info.scsi.dma != NO_DMA)
412		free_dma(info->info.scsi.dma);
413	free_irq(ec->irq, info);
414
415	fas216_release(host);
416	scsi_host_put(host);
417	ecard_release_resources(ec);
418}
419
420static const struct ecard_id powertecscsi_cids[] = {
421	{ MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI },
422	{ 0xffff, 0xffff },
423};
424
425static struct ecard_driver powertecscsi_driver = {
426	.probe		= powertecscsi_probe,
427	.remove		= powertecscsi_remove,
428	.id_table	= powertecscsi_cids,
429	.drv = {
430		.name		= "powertecscsi",
431	},
432};
433
434static int __init powertecscsi_init(void)
435{
436	return ecard_register_driver(&powertecscsi_driver);
437}
438
439static void __exit powertecscsi_exit(void)
440{
441	ecard_remove_driver(&powertecscsi_driver);
442}
443
444module_init(powertecscsi_init);
445module_exit(powertecscsi_exit);
446
447MODULE_AUTHOR("Russell King");
448MODULE_DESCRIPTION("Powertec SCSI driver");
449module_param_array(term, int, NULL, 0);
450MODULE_PARM_DESC(term, "SCSI bus termination");
451MODULE_LICENSE("GPL");
452