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[pohmelfs.git] / drivers / mtd / maps / pci.c
blob1d005a3e9b41603856c40a60fee6de972771634f
1 /*
2 * linux/drivers/mtd/maps/pci.c
4 * Copyright (C) 2001 Russell King, All rights reserved.
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.
10 * Generic PCI memory map driver. We support the following boards:
11 * - Intel IQ80310 ATU.
12 * - Intel EBSA285 (blank rom programming mode). Tested working 27/09/2001
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/pci.h>
17 #include <linux/init.h>
18 #include <linux/slab.h>
20 #include <linux/mtd/mtd.h>
21 #include <linux/mtd/map.h>
22 #include <linux/mtd/partitions.h>
24 struct map_pci_info;
26 struct mtd_pci_info {
27 int (*init)(struct pci_dev *dev, struct map_pci_info *map);
28 void (*exit)(struct pci_dev *dev, struct map_pci_info *map);
29 unsigned long (*translate)(struct map_pci_info *map, unsigned long ofs);
30 const char *map_name;
33 struct map_pci_info {
34 struct map_info map;
35 void __iomem *base;
36 void (*exit)(struct pci_dev *dev, struct map_pci_info *map);
37 unsigned long (*translate)(struct map_pci_info *map, unsigned long ofs);
38 struct pci_dev *dev;
41 static map_word mtd_pci_read8(struct map_info *_map, unsigned long ofs)
43 struct map_pci_info *map = (struct map_pci_info *)_map;
44 map_word val;
45 val.x[0]= readb(map->base + map->translate(map, ofs));
46 // printk("read8 : %08lx => %02x\n", ofs, val.x[0]);
47 return val;
50 #if 0
51 static map_word mtd_pci_read16(struct map_info *_map, unsigned long ofs)
53 struct map_pci_info *map = (struct map_pci_info *)_map;
54 map_word val;
55 val.x[0] = readw(map->base + map->translate(map, ofs));
56 // printk("read16: %08lx => %04x\n", ofs, val.x[0]);
57 return val;
59 #endif
60 static map_word mtd_pci_read32(struct map_info *_map, unsigned long ofs)
62 struct map_pci_info *map = (struct map_pci_info *)_map;
63 map_word val;
64 val.x[0] = readl(map->base + map->translate(map, ofs));
65 // printk("read32: %08lx => %08x\n", ofs, val.x[0]);
66 return val;
69 static void mtd_pci_copyfrom(struct map_info *_map, void *to, unsigned long from, ssize_t len)
71 struct map_pci_info *map = (struct map_pci_info *)_map;
72 memcpy_fromio(to, map->base + map->translate(map, from), len);
75 static void mtd_pci_write8(struct map_info *_map, map_word val, unsigned long ofs)
77 struct map_pci_info *map = (struct map_pci_info *)_map;
78 // printk("write8 : %08lx <= %02x\n", ofs, val.x[0]);
79 writeb(val.x[0], map->base + map->translate(map, ofs));
82 #if 0
83 static void mtd_pci_write16(struct map_info *_map, map_word val, unsigned long ofs)
85 struct map_pci_info *map = (struct map_pci_info *)_map;
86 // printk("write16: %08lx <= %04x\n", ofs, val.x[0]);
87 writew(val.x[0], map->base + map->translate(map, ofs));
89 #endif
90 static void mtd_pci_write32(struct map_info *_map, map_word val, unsigned long ofs)
92 struct map_pci_info *map = (struct map_pci_info *)_map;
93 // printk("write32: %08lx <= %08x\n", ofs, val.x[0]);
94 writel(val.x[0], map->base + map->translate(map, ofs));
97 static void mtd_pci_copyto(struct map_info *_map, unsigned long to, const void *from, ssize_t len)
99 struct map_pci_info *map = (struct map_pci_info *)_map;
100 memcpy_toio(map->base + map->translate(map, to), from, len);
103 static const struct map_info mtd_pci_map = {
104 .phys = NO_XIP,
105 .copy_from = mtd_pci_copyfrom,
106 .copy_to = mtd_pci_copyto,
110 * Intel IOP80310 Flash driver
113 static int
114 intel_iq80310_init(struct pci_dev *dev, struct map_pci_info *map)
116 u32 win_base;
118 map->map.bankwidth = 1;
119 map->map.read = mtd_pci_read8,
120 map->map.write = mtd_pci_write8,
122 map->map.size = 0x00800000;
123 map->base = ioremap_nocache(pci_resource_start(dev, 0),
124 pci_resource_len(dev, 0));
126 if (!map->base)
127 return -ENOMEM;
130 * We want to base the memory window at Xscale
131 * bus address 0, not 0x1000.
133 pci_read_config_dword(dev, 0x44, &win_base);
134 pci_write_config_dword(dev, 0x44, 0);
136 map->map.map_priv_2 = win_base;
138 return 0;
141 static void
142 intel_iq80310_exit(struct pci_dev *dev, struct map_pci_info *map)
144 if (map->base)
145 iounmap(map->base);
146 pci_write_config_dword(dev, 0x44, map->map.map_priv_2);
149 static unsigned long
150 intel_iq80310_translate(struct map_pci_info *map, unsigned long ofs)
152 unsigned long page_addr = ofs & 0x00400000;
155 * This mundges the flash location so we avoid
156 * the first 80 bytes (they appear to read nonsense).
158 if (page_addr) {
159 writel(0x00000008, map->base + 0x1558);
160 writel(0x00000000, map->base + 0x1550);
161 } else {
162 writel(0x00000007, map->base + 0x1558);
163 writel(0x00800000, map->base + 0x1550);
164 ofs += 0x00800000;
167 return ofs;
170 static struct mtd_pci_info intel_iq80310_info = {
171 .init = intel_iq80310_init,
172 .exit = intel_iq80310_exit,
173 .translate = intel_iq80310_translate,
174 .map_name = "cfi_probe",
178 * Intel DC21285 driver
181 static int
182 intel_dc21285_init(struct pci_dev *dev, struct map_pci_info *map)
184 unsigned long base, len;
186 base = pci_resource_start(dev, PCI_ROM_RESOURCE);
187 len = pci_resource_len(dev, PCI_ROM_RESOURCE);
189 if (!len || !base) {
191 * No ROM resource
193 base = pci_resource_start(dev, 2);
194 len = pci_resource_len(dev, 2);
197 * We need to re-allocate PCI BAR2 address range to the
198 * PCI ROM BAR, and disable PCI BAR2.
200 } else {
202 * Hmm, if an address was allocated to the ROM resource, but
203 * not enabled, should we be allocating a new resource for it
204 * or simply enabling it?
206 pci_enable_rom(dev);
207 printk("%s: enabling expansion ROM\n", pci_name(dev));
210 if (!len || !base)
211 return -ENXIO;
213 map->map.bankwidth = 4;
214 map->map.read = mtd_pci_read32,
215 map->map.write = mtd_pci_write32,
216 map->map.size = len;
217 map->base = ioremap_nocache(base, len);
219 if (!map->base)
220 return -ENOMEM;
222 return 0;
225 static void
226 intel_dc21285_exit(struct pci_dev *dev, struct map_pci_info *map)
228 if (map->base)
229 iounmap(map->base);
232 * We need to undo the PCI BAR2/PCI ROM BAR address alteration.
234 pci_disable_rom(dev);
237 static unsigned long
238 intel_dc21285_translate(struct map_pci_info *map, unsigned long ofs)
240 return ofs & 0x00ffffc0 ? ofs : (ofs ^ (1 << 5));
243 static struct mtd_pci_info intel_dc21285_info = {
244 .init = intel_dc21285_init,
245 .exit = intel_dc21285_exit,
246 .translate = intel_dc21285_translate,
247 .map_name = "jedec_probe",
251 * PCI device ID table
254 static struct pci_device_id mtd_pci_ids[] = {
256 .vendor = PCI_VENDOR_ID_INTEL,
257 .device = 0x530d,
258 .subvendor = PCI_ANY_ID,
259 .subdevice = PCI_ANY_ID,
260 .class = PCI_CLASS_MEMORY_OTHER << 8,
261 .class_mask = 0xffff00,
262 .driver_data = (unsigned long)&intel_iq80310_info,
265 .vendor = PCI_VENDOR_ID_DEC,
266 .device = PCI_DEVICE_ID_DEC_21285,
267 .subvendor = 0, /* DC21285 defaults to 0 on reset */
268 .subdevice = 0, /* DC21285 defaults to 0 on reset */
269 .driver_data = (unsigned long)&intel_dc21285_info,
271 { 0, }
275 * Generic code follows.
278 static int __devinit
279 mtd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
281 struct mtd_pci_info *info = (struct mtd_pci_info *)id->driver_data;
282 struct map_pci_info *map = NULL;
283 struct mtd_info *mtd = NULL;
284 int err;
286 err = pci_enable_device(dev);
287 if (err)
288 goto out;
290 err = pci_request_regions(dev, "pci mtd");
291 if (err)
292 goto out;
294 map = kmalloc(sizeof(*map), GFP_KERNEL);
295 err = -ENOMEM;
296 if (!map)
297 goto release;
299 map->map = mtd_pci_map;
300 map->map.name = pci_name(dev);
301 map->dev = dev;
302 map->exit = info->exit;
303 map->translate = info->translate;
305 err = info->init(dev, map);
306 if (err)
307 goto release;
309 /* tsk - do_map_probe should take const char * */
310 mtd = do_map_probe((char *)info->map_name, &map->map);
311 err = -ENODEV;
312 if (!mtd)
313 goto release;
315 mtd->owner = THIS_MODULE;
316 mtd_device_register(mtd, NULL, 0);
318 pci_set_drvdata(dev, mtd);
320 return 0;
322 release:
323 if (map) {
324 map->exit(dev, map);
325 kfree(map);
328 pci_release_regions(dev);
329 out:
330 return err;
333 static void __devexit
334 mtd_pci_remove(struct pci_dev *dev)
336 struct mtd_info *mtd = pci_get_drvdata(dev);
337 struct map_pci_info *map = mtd->priv;
339 mtd_device_unregister(mtd);
340 map_destroy(mtd);
341 map->exit(dev, map);
342 kfree(map);
344 pci_set_drvdata(dev, NULL);
345 pci_release_regions(dev);
348 static struct pci_driver mtd_pci_driver = {
349 .name = "MTD PCI",
350 .probe = mtd_pci_probe,
351 .remove = __devexit_p(mtd_pci_remove),
352 .id_table = mtd_pci_ids,
355 static int __init mtd_pci_maps_init(void)
357 return pci_register_driver(&mtd_pci_driver);
360 static void __exit mtd_pci_maps_exit(void)
362 pci_unregister_driver(&mtd_pci_driver);
365 module_init(mtd_pci_maps_init);
366 module_exit(mtd_pci_maps_exit);
368 MODULE_LICENSE("GPL");
369 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
370 MODULE_DESCRIPTION("Generic PCI map driver");
371 MODULE_DEVICE_TABLE(pci, mtd_pci_ids);