aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/mtd/maps/pci.c
blob: 18dbd3af1eaa652a34d4677a97f1742d4851d74c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
/*
 *  linux/drivers/mtd/maps/pci.c
 *
 *  Copyright (C) 2001 Russell King, All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  $Id: pci.c,v 1.10 2005/03/18 14:04:35 gleixner Exp $
 * 
 * Generic PCI memory map driver.  We support the following boards:
 *  - Intel IQ80310 ATU.
 *  - Intel EBSA285 (blank rom programming mode). Tested working 27/09/2001
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>

struct map_pci_info;

struct mtd_pci_info {
	int  (*init)(struct pci_dev *dev, struct map_pci_info *map);
	void (*exit)(struct pci_dev *dev, struct map_pci_info *map);
	unsigned long (*translate)(struct map_pci_info *map, unsigned long ofs);
	const char *map_name;
};

struct map_pci_info {
	struct map_info map;
	void __iomem *base;
	void (*exit)(struct pci_dev *dev, struct map_pci_info *map);
	unsigned long (*translate)(struct map_pci_info *map, unsigned long ofs);
	struct pci_dev *dev;
};	

static map_word mtd_pci_read8(struct map_info *_map, unsigned long ofs)
{
	struct map_pci_info *map = (struct map_pci_info *)_map;
	map_word val;
	val.x[0]= readb(map->base + map->translate(map, ofs));
//	printk("read8 : %08lx => %02x\n", ofs, val.x[0]);
	return val;
}

#if 0
static map_word mtd_pci_read16(struct map_info *_map, unsigned long ofs)
{
	struct map_pci_info *map = (struct map_pci_info *)_map;
	map_word val;
	val.x[0] = readw(map->base + map->translate(map, ofs));
//	printk("read16: %08lx => %04x\n", ofs, val.x[0]);
	return val;
}
#endif
static map_word mtd_pci_read32(struct map_info *_map, unsigned long ofs)
{
	struct map_pci_info *map = (struct map_pci_info *)_map;
	map_word val;
	val.x[0] = readl(map->base + map->translate(map, ofs));
//	printk("read32: %08lx => %08x\n", ofs, val.x[0]);
	return val;
}

static void mtd_pci_copyfrom(struct map_info *_map, void *to, unsigned long from, ssize_t len)
{
	struct map_pci_info *map = (struct map_pci_info *)_map;
	memcpy_fromio(to, map->base + map->translate(map, from), len);
}

static void mtd_pci_write8(struct map_info *_map, map_word val, unsigned long ofs)
{
	struct map_pci_info *map = (struct map_pci_info *)_map;
//	printk("write8 : %08lx <= %02x\n", ofs, val.x[0]);
	writeb(val.x[0], map->base + map->translate(map, ofs));
}

#if 0
static void mtd_pci_write16(struct map_info *_map, map_word val, unsigned long ofs)
{
	struct map_pci_info *map = (struct map_pci_info *)_map;
//	printk("write16: %08lx <= %04x\n", ofs, val.x[0]);
	writew(val.x[0], map->base + map->translate(map, ofs));
}
#endif
static void mtd_pci_write32(struct map_info *_map, map_word val, unsigned long ofs)
{
	struct map_pci_info *map = (struct map_pci_info *)_map;
//	printk("write32: %08lx <= %08x\n", ofs, val.x[0]);
	writel(val.x[0], map->base + map->translate(map, ofs));
}

static void mtd_pci_copyto(struct map_info *_map, unsigned long to, const void *from, ssize_t len)
{
	struct map_pci_info *map = (struct map_pci_info *)_map;
	memcpy_toio(map->base + map->translate(map, to), from, len);
}

static struct map_info mtd_pci_map = {
	.phys =		NO_XIP,
	.copy_from =	mtd_pci_copyfrom,
	.copy_to =	mtd_pci_copyto,
};

/*
 * Intel IOP80310 Flash driver
 */

static int
intel_iq80310_init(struct pci_dev *dev, struct map_pci_info *map)
{
	u32 win_base;

	map->map.bankwidth = 1;
	map->map.read = mtd_pci_read8,
	map->map.write = mtd_pci_write8,

	map->map.size     = 0x00800000;
	map->base         = ioremap_nocache(pci_resource_start(dev, 0),
					    pci_resource_len(dev, 0));

	if (!map->base)
		return -ENOMEM;

	/*
	 * We want to base the memory window at Xscale
	 * bus address 0, not 0x1000.
	 */
	pci_read_config_dword(dev, 0x44, &win_base);
	pci_write_config_dword(dev, 0x44, 0);

	map->map.map_priv_2 = win_base;

	return 0;
}

static void
intel_iq80310_exit(struct pci_dev *dev, struct map_pci_info *map)
{
	if (map->base)
		iounmap(map->base);
	pci_write_config_dword(dev, 0x44, map->map.map_priv_2);
}

static unsigned long
intel_iq80310_translate(struct map_pci_info *map, unsigned long ofs)
{
	unsigned long page_addr = ofs & 0x00400000;

	/*
	 * This mundges the flash location so we avoid
	 * the first 80 bytes (they appear to read nonsense).
	 */
	if (page_addr) {
		writel(0x00000008, map->base + 0x1558);
		writel(0x00000000, map->base + 0x1550);
	} else {
		writel(0x00000007, map->base + 0x1558);
		writel(0x00800000, map->base + 0x1550);
		ofs += 0x00800000;
	}

	return ofs;
}

static struct mtd_pci_info intel_iq80310_info = {
	.init =		intel_iq80310_init,
	.exit =		intel_iq80310_exit,
	.translate =	intel_iq80310_translate,
	.map_name =	"cfi_probe",
};

/*
 * Intel DC21285 driver
 */

static int
intel_dc21285_init(struct pci_dev *dev, struct map_pci_info *map)
{
	unsigned long base, len;

	base = pci_resource_start(dev, PCI_ROM_RESOURCE);
	len  = pci_resource_len(dev, PCI_ROM_RESOURCE);

	if (!len || !base) {
		/*
		 * No ROM resource
		 */
		base = pci_resource_start(dev, 2);
		len  = pci_resource_len(dev, 2);

		/*
		 * We need to re-allocate PCI BAR2 address range to the
		 * PCI ROM BAR, and disable PCI BAR2.
		 */
	} else {
		/*
		 * Hmm, if an address was allocated to the ROM resource, but
		 * not enabled, should we be allocating a new resource for it
		 * or simply enabling it?
		 */
		if (!(pci_resource_flags(dev, PCI_ROM_RESOURCE) &
				    IORESOURCE_ROM_ENABLE)) {
		     	u32 val;
			pci_resource_flags(dev, PCI_ROM_RESOURCE) |= IORESOURCE_ROM_ENABLE;
			pci_read_config_dword(dev, PCI_ROM_ADDRESS, &val);
			val |= PCI_ROM_ADDRESS_ENABLE;
			pci_write_config_dword(dev, PCI_ROM_ADDRESS, val);
			printk("%s: enabling expansion ROM\n", pci_name(dev));
		}
	}

	if (!len || !base)
		return -ENXIO;

	map->map.bankwidth = 4;
	map->map.read = mtd_pci_read32,
	map->map.write = mtd_pci_write32,
	map->map.size     = len;
	map->base         = ioremap_nocache(base, len);

	if (!map->base)
		return -ENOMEM;

	return 0;
}

static void
intel_dc21285_exit(struct pci_dev *dev, struct map_pci_info *map)
{
	u32 val;

	if (map->base)
		iounmap(map->base);

	/*
	 * We need to undo the PCI BAR2/PCI ROM BAR address alteration.
	 */
	pci_resource_flags(dev, PCI_ROM_RESOURCE) &= ~IORESOURCE_ROM_ENABLE;
	pci_read_config_dword(dev, PCI_ROM_ADDRESS, &val);
	val &= ~PCI_ROM_ADDRESS_ENABLE;
	pci_write_config_dword(dev, PCI_ROM_ADDRESS, val);
}

static unsigned long
intel_dc21285_translate(struct map_pci_info *map, unsigned long ofs)
{
	return ofs & 0x00ffffc0 ? ofs : (ofs ^ (1 << 5));
}

static struct mtd_pci_info intel_dc21285_info = {
	.init =		intel_dc21285_init,
	.exit =		intel_dc21285_exit,
	.translate =	intel_dc21285_translate,
	.map_name =	"jedec_probe",
};

/*
 * PCI device ID table
 */

static struct pci_device_id mtd_pci_ids[] = {
	{
		.vendor =	PCI_VENDOR_ID_INTEL,
		.device =	0x530d,
		.subvendor =	PCI_ANY_ID,
		.subdevice =	PCI_ANY_ID,
		.class =	PCI_CLASS_MEMORY_OTHER << 8,
		.class_mask =	0xffff00,
		.driver_data =	(unsigned long)&intel_iq80310_info,
	},
	{
		.vendor =	PCI_VENDOR_ID_DEC,
		.device =	PCI_DEVICE_ID_DEC_21285,
		.subvendor =	0,	/* DC21285 defaults to 0 on reset */
		.subdevice =	0,	/* DC21285 defaults to 0 on reset */
		.driver_data =	(unsigned long)&intel_dc21285_info,
	},
	{ 0, }
};

/*
 * Generic code follows.
 */

static int __devinit
mtd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
	struct mtd_pci_info *info = (struct mtd_pci_info *)id->driver_data;
	struct map_pci_info *map = NULL;
	struct mtd_info *mtd = NULL;
	int err;

	err = pci_enable_device(dev);
	if (err)
		goto out;

	err = pci_request_regions(dev, "pci mtd");
	if (err)
		goto out;

	map = kmalloc(sizeof(*map), GFP_KERNEL);
	err = -ENOMEM;
	if (!map)
		goto release;

	map->map       = mtd_pci_map;
	map->map.name  = pci_name(dev);
	map->dev       = dev;
	map->exit      = info->exit;
	map->translate = info->translate;

	err = info->init(dev, map);
	if (err)
		goto release;

	/* tsk - do_map_probe should take const char * */
	mtd = do_map_probe((char *)info->map_name, &map->map);
	err = -ENODEV;
	if (!mtd)
		goto release;

	mtd->owner = THIS_MODULE;
	add_mtd_device(mtd);

	pci_set_drvdata(dev, mtd);

	return 0;

release:
	if (mtd)
		map_destroy(mtd);

	if (map) {
		map->exit(dev, map);
		kfree(map);
	}

	pci_release_regions(dev);
out:
	return err;
}

static void __devexit
mtd_pci_remove(struct pci_dev *dev)
{
	struct mtd_info *mtd = pci_get_drvdata(dev);
	struct map_pci_info *map = mtd->priv;

	del_mtd_device(mtd);
	map_destroy(mtd);
	map->exit(dev, map);
	kfree(map);

	pci_set_drvdata(dev, NULL);
	pci_release_regions(dev);
}

static struct pci_driver mtd_pci_driver = {
	.name =		"MTD PCI",
	.probe =	mtd_pci_probe,
	.remove =	__devexit_p(mtd_pci_remove),
	.id_table =	mtd_pci_ids,
};

static int __init mtd_pci_maps_init(void)
{
	return pci_register_driver(&mtd_pci_driver);
}

static void __exit mtd_pci_maps_exit(void)
{
	pci_unregister_driver(&mtd_pci_driver);
}

module_init(mtd_pci_maps_init);
module_exit(mtd_pci_maps_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
MODULE_DESCRIPTION("Generic PCI map driver");
MODULE_DEVICE_TABLE(pci, mtd_pci_ids);