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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / mtd / maps / pci.c
blobd2ab1bae9c346fbf2168ff59199222f226e6f2cb
1 /*
2 * linux/drivers/mtd/maps/pci.c
3 *
4 * Copyright (C) 2001 Russell King, All rights reserved.
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 * $Id: pci.c,v 1.14 2005/11/17 08:20:27 dwmw2 Exp $
11 *
12 * Generic PCI memory map driver. We support the following boards:
13 * - Intel IQ80310 ATU.
14 * - Intel EBSA285 (blank rom programming mode). Tested working 27/09/2001
15 */
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/pci.h>
19 #include <linux/init.h>
20 #include <linux/slab.h>
21
22 #include <linux/mtd/mtd.h>
23 #include <linux/mtd/map.h>
24 #include <linux/mtd/partitions.h>
25
26 struct map_pci_info;
27
28 struct mtd_pci_info {
29 int (*init)(struct pci_dev *dev, struct map_pci_info *map);
30 void (*exit)(struct pci_dev *dev, struct map_pci_info *map);
31 unsigned long (*translate)(struct map_pci_info *map, unsigned long ofs);
32 const char *map_name;
33 };
34
35 struct map_pci_info {
36 struct map_info map;
37 void __iomem *base;
38 void (*exit)(struct pci_dev *dev, struct map_pci_info *map);
39 unsigned long (*translate)(struct map_pci_info *map, unsigned long ofs);
40 struct pci_dev *dev;
41 };
42
43 static map_word mtd_pci_read8(struct map_info *_map, unsigned long ofs)
44 {
45 struct map_pci_info *map = (struct map_pci_info *)_map;
46 map_word val;
47 val.x[0]= readb(map->base + map->translate(map, ofs));
48 // printk("read8 : %08lx => %02x\n", ofs, val.x[0]);
49 return val;
50 }
51
52 #if 0
53 static map_word mtd_pci_read16(struct map_info *_map, unsigned long ofs)
54 {
55 struct map_pci_info *map = (struct map_pci_info *)_map;
56 map_word val;
57 val.x[0] = readw(map->base + map->translate(map, ofs));
58 // printk("read16: %08lx => %04x\n", ofs, val.x[0]);
59 return val;
60 }
61 #endif
62 static map_word mtd_pci_read32(struct map_info *_map, unsigned long ofs)
63 {
64 struct map_pci_info *map = (struct map_pci_info *)_map;
65 map_word val;
66 val.x[0] = readl(map->base + map->translate(map, ofs));
67 // printk("read32: %08lx => %08x\n", ofs, val.x[0]);
68 return val;
69 }
70
71 static void mtd_pci_copyfrom(struct map_info *_map, void *to, unsigned long from, ssize_t len)
72 {
73 struct map_pci_info *map = (struct map_pci_info *)_map;
74 memcpy_fromio(to, map->base + map->translate(map, from), len);
75 }
76
77 static void mtd_pci_write8(struct map_info *_map, map_word val, unsigned long ofs)
78 {
79 struct map_pci_info *map = (struct map_pci_info *)_map;
80 // printk("write8 : %08lx <= %02x\n", ofs, val.x[0]);
81 writeb(val.x[0], map->base + map->translate(map, ofs));
82 }
83
84 #if 0
85 static void mtd_pci_write16(struct map_info *_map, map_word val, unsigned long ofs)
86 {
87 struct map_pci_info *map = (struct map_pci_info *)_map;
88 // printk("write16: %08lx <= %04x\n", ofs, val.x[0]);
89 writew(val.x[0], map->base + map->translate(map, ofs));
90 }
91 #endif
92 static void mtd_pci_write32(struct map_info *_map, map_word val, unsigned long ofs)
93 {
94 struct map_pci_info *map = (struct map_pci_info *)_map;
95 // printk("write32: %08lx <= %08x\n", ofs, val.x[0]);
96 writel(val.x[0], map->base + map->translate(map, ofs));
97 }
98
99 static void mtd_pci_copyto(struct map_info *_map, unsigned long to, const void *from, ssize_t len)
100 {
101 struct map_pci_info *map = (struct map_pci_info *)_map;
102 memcpy_toio(map->base + map->translate(map, to), from, len);
103 }
104
105 static const struct map_info mtd_pci_map = {
106 .phys = NO_XIP,
107 .copy_from = mtd_pci_copyfrom,
108 .copy_to = mtd_pci_copyto,
109 };
110
111 /*
112 * Intel IOP80310 Flash driver
113 */
114
115 static int
116 intel_iq80310_init(struct pci_dev *dev, struct map_pci_info *map)
117 {
118 u32 win_base;
119
120 map->map.bankwidth = 1;
121 map->map.read = mtd_pci_read8,
122 map->map.write = mtd_pci_write8,
123
124 map->map.size = 0x00800000;
125 map->base = ioremap_nocache(pci_resource_start(dev, 0),
126 pci_resource_len(dev, 0));
127
128 if (!map->base)
129 return -ENOMEM;
130
131 /*
132 * We want to base the memory window at Xscale
133 * bus address 0, not 0x1000.
134 */
135 pci_read_config_dword(dev, 0x44, &win_base);
136 pci_write_config_dword(dev, 0x44, 0);
137
138 map->map.map_priv_2 = win_base;
139
140 return 0;
141 }
142
143 static void
144 intel_iq80310_exit(struct pci_dev *dev, struct map_pci_info *map)
145 {
146 if (map->base)
147 iounmap(map->base);
148 pci_write_config_dword(dev, 0x44, map->map.map_priv_2);
149 }
150
151 static unsigned long
152 intel_iq80310_translate(struct map_pci_info *map, unsigned long ofs)
153 {
154 unsigned long page_addr = ofs & 0x00400000;
155
156 /*
157 * This mundges the flash location so we avoid
158 * the first 80 bytes (they appear to read nonsense).
159 */
160 if (page_addr) {
161 writel(0x00000008, map->base + 0x1558);
162 writel(0x00000000, map->base + 0x1550);
163 } else {
164 writel(0x00000007, map->base + 0x1558);
165 writel(0x00800000, map->base + 0x1550);
166 ofs += 0x00800000;
167 }
168
169 return ofs;
170 }
171
172 static struct mtd_pci_info intel_iq80310_info = {
173 .init = intel_iq80310_init,
174 .exit = intel_iq80310_exit,
175 .translate = intel_iq80310_translate,
176 .map_name = "cfi_probe",
177 };
178
179 /*
180 * Intel DC21285 driver
181 */
182
183 static int
184 intel_dc21285_init(struct pci_dev *dev, struct map_pci_info *map)
185 {
186 unsigned long base, len;
187
188 base = pci_resource_start(dev, PCI_ROM_RESOURCE);
189 len = pci_resource_len(dev, PCI_ROM_RESOURCE);
190
191 if (!len || !base) {
192 /*
193 * No ROM resource
194 */
195 base = pci_resource_start(dev, 2);
196 len = pci_resource_len(dev, 2);
197
198 /*
199 * We need to re-allocate PCI BAR2 address range to the
200 * PCI ROM BAR, and disable PCI BAR2.
201 */
202 } else {
203 /*
204 * Hmm, if an address was allocated to the ROM resource, but
205 * not enabled, should we be allocating a new resource for it
206 * or simply enabling it?
207 */
208 if (!(pci_resource_flags(dev, PCI_ROM_RESOURCE) &
209 IORESOURCE_ROM_ENABLE)) {
210 u32 val;
211 pci_resource_flags(dev, PCI_ROM_RESOURCE) |= IORESOURCE_ROM_ENABLE;
212 pci_read_config_dword(dev, PCI_ROM_ADDRESS, &val);
213 val |= PCI_ROM_ADDRESS_ENABLE;
214 pci_write_config_dword(dev, PCI_ROM_ADDRESS, val);
215 printk("%s: enabling expansion ROM\n", pci_name(dev));
216 }
217 }
218
219 if (!len || !base)
220 return -ENXIO;
221
222 map->map.bankwidth = 4;
223 map->map.read = mtd_pci_read32,
224 map->map.write = mtd_pci_write32,
225 map->map.size = len;
226 map->base = ioremap_nocache(base, len);
227
228 if (!map->base)
229 return -ENOMEM;
230
231 return 0;
232 }
233
234 static void
235 intel_dc21285_exit(struct pci_dev *dev, struct map_pci_info *map)
236 {
237 u32 val;
238
239 if (map->base)
240 iounmap(map->base);
241
242 /*
243 * We need to undo the PCI BAR2/PCI ROM BAR address alteration.
244 */
245 pci_resource_flags(dev, PCI_ROM_RESOURCE) &= ~IORESOURCE_ROM_ENABLE;
246 pci_read_config_dword(dev, PCI_ROM_ADDRESS, &val);
247 val &= ~PCI_ROM_ADDRESS_ENABLE;
248 pci_write_config_dword(dev, PCI_ROM_ADDRESS, val);
249 }
250
251 static unsigned long
252 intel_dc21285_translate(struct map_pci_info *map, unsigned long ofs)
253 {
254 return ofs & 0x00ffffc0 ? ofs : (ofs ^ (1 << 5));
255 }
256
257 static struct mtd_pci_info intel_dc21285_info = {
258 .init = intel_dc21285_init,
259 .exit = intel_dc21285_exit,
260 .translate = intel_dc21285_translate,
261 .map_name = "jedec_probe",
262 };
263
264 /*
265 * PCI device ID table
266 */
267
268 static struct pci_device_id mtd_pci_ids[] = {
269 {
270 .vendor = PCI_VENDOR_ID_INTEL,
271 .device = 0x530d,
272 .subvendor = PCI_ANY_ID,
273 .subdevice = PCI_ANY_ID,
274 .class = PCI_CLASS_MEMORY_OTHER << 8,
275 .class_mask = 0xffff00,
276 .driver_data = (unsigned long)&intel_iq80310_info,
277 },
278 {
279 .vendor = PCI_VENDOR_ID_DEC,
280 .device = PCI_DEVICE_ID_DEC_21285,
281 .subvendor = 0, /* DC21285 defaults to 0 on reset */
282 .subdevice = 0, /* DC21285 defaults to 0 on reset */
283 .driver_data = (unsigned long)&intel_dc21285_info,
284 },
285 { 0, }
286 };
287
288 /*
289 * Generic code follows.
290 */
291
292 static int __devinit
293 mtd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
294 {
295 struct mtd_pci_info *info = (struct mtd_pci_info *)id->driver_data;
296 struct map_pci_info *map = NULL;
297 struct mtd_info *mtd = NULL;
298 int err;
299
300 err = pci_enable_device(dev);
301 if (err)
302 goto out;
303
304 err = pci_request_regions(dev, "pci mtd");
305 if (err)
306 goto out;
307
308 map = kmalloc(sizeof(*map), GFP_KERNEL);
309 err = -ENOMEM;
310 if (!map)
311 goto release;
312
313 map->map = mtd_pci_map;
314 map->map.name = pci_name(dev);
315 map->dev = dev;
316 map->exit = info->exit;
317 map->translate = info->translate;
318
319 err = info->init(dev, map);
320 if (err)
321 goto release;
322
323 /* tsk - do_map_probe should take const char * */
324 mtd = do_map_probe((char *)info->map_name, &map->map);
325 err = -ENODEV;
326 if (!mtd)
327 goto release;
328
329 mtd->owner = THIS_MODULE;
330 add_mtd_device(mtd);
331
332 pci_set_drvdata(dev, mtd);
333
334 return 0;
335
336 release:
337 if (map) {
338 map->exit(dev, map);
339 kfree(map);
340 }
341
342 pci_release_regions(dev);
343 out:
344 return err;
345 }
346
347 static void __devexit
348 mtd_pci_remove(struct pci_dev *dev)
349 {
350 struct mtd_info *mtd = pci_get_drvdata(dev);
351 struct map_pci_info *map = mtd->priv;
352
353 del_mtd_device(mtd);
354 map_destroy(mtd);
355 map->exit(dev, map);
356 kfree(map);
357
358 pci_set_drvdata(dev, NULL);
359 pci_release_regions(dev);
360 }
361
362 static struct pci_driver mtd_pci_driver = {
363 .name = "MTD PCI",
364 .probe = mtd_pci_probe,
365 .remove = __devexit_p(mtd_pci_remove),
366 .id_table = mtd_pci_ids,
367 };
368
369 static int __init mtd_pci_maps_init(void)
370 {
371 return pci_register_driver(&mtd_pci_driver);
372 }
373
374 static void __exit mtd_pci_maps_exit(void)
375 {
376 pci_unregister_driver(&mtd_pci_driver);
377 }
378
379 module_init(mtd_pci_maps_init);
380 module_exit(mtd_pci_maps_exit);
381
382 MODULE_LICENSE("GPL");
383 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
384 MODULE_DESCRIPTION("Generic PCI map driver");
385 MODULE_DEVICE_TABLE(pci, mtd_pci_ids);
386
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