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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * drivers/mtd/maps/ixp4xx.c
3 *
4 * MTD Map file for IXP4XX based systems. Please do not make per-board
5 * changes in here. If your board needs special setup, do it in your
6 * platform level code in arch/arm/mach-ixp4xx/board-setup.c
7 *
8 * Original Author: Intel Corporation
9 * Maintainer: Deepak Saxena <dsaxena@mvista.com>
10 *
11 * Copyright (C) 2002 Intel Corporation
12 * Copyright (C) 2003-2004 MontaVista Software, Inc.
13 *
14 */
15
16#include <linux/module.h>
17#include <linux/types.h>
18#include <linux/init.h>
19#include <linux/kernel.h>
20#include <linux/string.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080021#include <linux/slab.h>
22#include <linux/ioport.h>
23#include <linux/device.h>
Linus Torvalds4fd5f822005-10-31 07:32:56 -080024#include <linux/platform_device.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080025
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/mtd/mtd.h>
27#include <linux/mtd/map.h>
28#include <linux/mtd/partitions.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080029
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <asm/mach/flash.h>
32
33#include <linux/reboot.h>
34
John Bowler3c773542005-11-16 16:23:25 +000035/*
36 * Read/write a 16 bit word from flash address 'addr'.
37 *
38 * When the cpu is in little-endian mode it swizzles the address lines
39 * ('address coherency') so we need to undo the swizzling to ensure commands
40 * and the like end up on the correct flash address.
41 *
42 * To further complicate matters, due to the way the expansion bus controller
43 * handles 32 bit reads, the byte stream ABCD is stored on the flash as:
44 * D15 D0
45 * +---+---+
46 * | A | B | 0
47 * +---+---+
48 * | C | D | 2
49 * +---+---+
50 * This means that on LE systems each 16 bit word must be swapped. Note that
51 * this requires CONFIG_MTD_CFI_BE_BYTE_SWAP to be enabled to 'unswap' the CFI
52 * data and other flash commands which are always in D7-D0.
53 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#ifndef __ARMEB__
John Bowler3c773542005-11-16 16:23:25 +000055#ifndef CONFIG_MTD_CFI_BE_BYTE_SWAP
56# error CONFIG_MTD_CFI_BE_BYTE_SWAP required
57#endif
58
59static inline u16 flash_read16(void __iomem *addr)
60{
61 return be16_to_cpu(__raw_readw((void __iomem *)((unsigned long)addr ^ 0x2)));
62}
63
64static inline void flash_write16(u16 d, void __iomem *addr)
65{
66 __raw_writew(cpu_to_be16(d), (void __iomem *)((unsigned long)addr ^ 0x2));
67}
68
Linus Torvalds1da177e2005-04-16 15:20:36 -070069#define BYTE0(h) ((h) & 0xFF)
70#define BYTE1(h) (((h) >> 8) & 0xFF)
John Bowler3c773542005-11-16 16:23:25 +000071
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#else
John Bowler3c773542005-11-16 16:23:25 +000073
74static inline u16 flash_read16(const void __iomem *addr)
75{
76 return __raw_readw(addr);
77}
78
79static inline void flash_write16(u16 d, void __iomem *addr)
80{
81 __raw_writew(d, addr);
82}
83
Linus Torvalds1da177e2005-04-16 15:20:36 -070084#define BYTE0(h) (((h) >> 8) & 0xFF)
85#define BYTE1(h) ((h) & 0xFF)
86#endif
87
88static map_word ixp4xx_read16(struct map_info *map, unsigned long ofs)
89{
90 map_word val;
John Bowler3c773542005-11-16 16:23:25 +000091 val.x[0] = flash_read16(map->virt + ofs);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 return val;
93}
94
95/*
96 * The IXP4xx expansion bus only allows 16-bit wide acceses
97 * when attached to a 16-bit wide device (such as the 28F128J3A),
98 * so we can't just memcpy_fromio().
99 */
100static void ixp4xx_copy_from(struct map_info *map, void *to,
101 unsigned long from, ssize_t len)
102{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 u8 *dest = (u8 *) to;
David Vrabel9090ed02005-11-01 16:46:19 +0000104 void __iomem *src = map->virt + from;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
John Bowler3c773542005-11-16 16:23:25 +0000106 if (len <= 0)
107 return;
108
109 if (from & 1) {
110 *dest++ = BYTE1(flash_read16(src));
111 src++;
112 --len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 }
114
John Bowler3c773542005-11-16 16:23:25 +0000115 while (len >= 2) {
116 u16 data = flash_read16(src);
117 *dest++ = BYTE0(data);
118 *dest++ = BYTE1(data);
119 src += 2;
120 len -= 2;
121 }
122
123 if (len > 0)
124 *dest++ = BYTE0(flash_read16(src));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125}
126
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000127/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 * Unaligned writes are ignored, causing the 8-bit
129 * probe to fail and proceed to the 16-bit probe (which succeeds).
130 */
131static void ixp4xx_probe_write16(struct map_info *map, map_word d, unsigned long adr)
132{
133 if (!(adr & 1))
John Bowler3c773542005-11-16 16:23:25 +0000134 flash_write16(d.x[0], map->virt + adr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135}
136
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000137/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 * Fast write16 function without the probing check above
139 */
140static void ixp4xx_write16(struct map_info *map, map_word d, unsigned long adr)
141{
John Bowler3c773542005-11-16 16:23:25 +0000142 flash_write16(d.x[0], map->virt + adr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143}
144
145struct ixp4xx_flash_info {
146 struct mtd_info *mtd;
147 struct map_info map;
148 struct mtd_partition *partitions;
149 struct resource *res;
150};
151
152static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
153
Russell King3ae5eae2005-11-09 22:32:44 +0000154static int ixp4xx_flash_remove(struct platform_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 struct flash_platform_data *plat = dev->dev.platform_data;
Russell King3ae5eae2005-11-09 22:32:44 +0000157 struct ixp4xx_flash_info *info = platform_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
Russell King3ae5eae2005-11-09 22:32:44 +0000159 platform_set_drvdata(dev, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
161 if(!info)
162 return 0;
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 if (info->mtd) {
165 del_mtd_partitions(info->mtd);
166 map_destroy(info->mtd);
167 }
David Vrabel9090ed02005-11-01 16:46:19 +0000168 if (info->map.virt)
169 iounmap(info->map.virt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
Jesper Juhlfa671642005-11-07 01:01:27 -0800171 kfree(info->partitions);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
173 if (info->res) {
174 release_resource(info->res);
175 kfree(info->res);
176 }
177
178 if (plat->exit)
179 plat->exit();
180
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 return 0;
182}
183
Russell King3ae5eae2005-11-09 22:32:44 +0000184static int ixp4xx_flash_probe(struct platform_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 struct flash_platform_data *plat = dev->dev.platform_data;
187 struct ixp4xx_flash_info *info;
188 int err = -1;
189
190 if (!plat)
191 return -ENODEV;
192
193 if (plat->init) {
194 err = plat->init();
195 if (err)
196 return err;
197 }
198
199 info = kmalloc(sizeof(struct ixp4xx_flash_info), GFP_KERNEL);
200 if(!info) {
201 err = -ENOMEM;
202 goto Error;
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000203 }
Russell King59f0cb02008-10-27 11:24:09 +0000204 memset(info, 0, sizeof(struct ixp4xx_flash_info));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
Russell King3ae5eae2005-11-09 22:32:44 +0000206 platform_set_drvdata(dev, info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 /*
209 * Tell the MTD layer we're not 1:1 mapped so that it does
210 * not attempt to do a direct access on us.
211 */
212 info->map.phys = NO_XIP;
213 info->map.size = dev->resource->end - dev->resource->start + 1;
214
215 /*
216 * We only support 16-bit accesses for now. If and when
217 * any board use 8-bit access, we'll fixup the driver to
218 * handle that.
219 */
220 info->map.bankwidth = 2;
Kay Sievers475b44c2009-01-06 10:44:38 -0800221 info->map.name = dev_name(&dev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 info->map.read = ixp4xx_read16,
223 info->map.write = ixp4xx_probe_write16,
224 info->map.copy_from = ixp4xx_copy_from,
225
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000226 info->res = request_mem_region(dev->resource->start,
227 dev->resource->end - dev->resource->start + 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 "IXP4XXFlash");
229 if (!info->res) {
230 printk(KERN_ERR "IXP4XXFlash: Could not reserve memory region\n");
231 err = -ENOMEM;
232 goto Error;
233 }
234
David Vrabel9090ed02005-11-01 16:46:19 +0000235 info->map.virt = ioremap(dev->resource->start,
236 dev->resource->end - dev->resource->start + 1);
237 if (!info->map.virt) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 printk(KERN_ERR "IXP4XXFlash: Failed to ioremap region\n");
239 err = -EIO;
240 goto Error;
241 }
242
243 info->mtd = do_map_probe(plat->map_name, &info->map);
244 if (!info->mtd) {
245 printk(KERN_ERR "IXP4XXFlash: map_probe failed\n");
246 err = -ENXIO;
247 goto Error;
248 }
249 info->mtd->owner = THIS_MODULE;
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000250
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 /* Use the fast version */
252 info->map.write = ixp4xx_write16,
253
Brian Walshf40a6f12006-09-22 10:16:16 +0100254 err = parse_mtd_partitions(info->mtd, probes, &info->partitions, dev->resource->start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 if (err > 0) {
256 err = add_mtd_partitions(info->mtd, info->partitions, err);
257 if(err)
258 printk(KERN_ERR "Could not parse partitions\n");
259 }
260
261 if (err)
262 goto Error;
263
264 return 0;
265
266Error:
Russell King3ae5eae2005-11-09 22:32:44 +0000267 ixp4xx_flash_remove(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 return err;
269}
270
Russell King3ae5eae2005-11-09 22:32:44 +0000271static struct platform_driver ixp4xx_flash_driver = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 .probe = ixp4xx_flash_probe,
273 .remove = ixp4xx_flash_remove,
Russell King3ae5eae2005-11-09 22:32:44 +0000274 .driver = {
275 .name = "IXP4XX-Flash",
Kay Sievers41d867c2008-04-18 13:44:26 -0700276 .owner = THIS_MODULE,
Russell King3ae5eae2005-11-09 22:32:44 +0000277 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278};
279
280static int __init ixp4xx_flash_init(void)
281{
Russell King3ae5eae2005-11-09 22:32:44 +0000282 return platform_driver_register(&ixp4xx_flash_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
284
285static void __exit ixp4xx_flash_exit(void)
286{
Russell King3ae5eae2005-11-09 22:32:44 +0000287 platform_driver_unregister(&ixp4xx_flash_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288}
289
290
291module_init(ixp4xx_flash_init);
292module_exit(ixp4xx_flash_exit);
293
294MODULE_LICENSE("GPL");
Deepak Saxena82810a92005-09-28 16:42:54 -0700295MODULE_DESCRIPTION("MTD map driver for Intel IXP4xx systems");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296MODULE_AUTHOR("Deepak Saxena");
Kay Sievers41d867c2008-04-18 13:44:26 -0700297MODULE_ALIAS("platform:IXP4XX-Flash");