blob: 3fcc3288407437792479c456574ac09c50ee716e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * $Id: ixp4xx.c,v 1.7 2004/11/04 13:24:15 gleixner Exp $
3 *
4 * drivers/mtd/maps/ixp4xx.c
5 *
6 * MTD Map file for IXP4XX based systems. Please do not make per-board
7 * changes in here. If your board needs special setup, do it in your
8 * platform level code in arch/arm/mach-ixp4xx/board-setup.c
9 *
10 * Original Author: Intel Corporation
11 * Maintainer: Deepak Saxena <dsaxena@mvista.com>
12 *
13 * Copyright (C) 2002 Intel Corporation
14 * Copyright (C) 2003-2004 MontaVista Software, Inc.
15 *
16 */
17
18#include <linux/module.h>
19#include <linux/types.h>
20#include <linux/init.h>
21#include <linux/kernel.h>
22#include <linux/string.h>
23#include <linux/mtd/mtd.h>
24#include <linux/mtd/map.h>
25#include <linux/mtd/partitions.h>
26#include <linux/ioport.h>
27#include <linux/device.h>
28#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <asm/mach/flash.h>
30
31#include <linux/reboot.h>
32
33#ifndef __ARMEB__
34#define BYTE0(h) ((h) & 0xFF)
35#define BYTE1(h) (((h) >> 8) & 0xFF)
36#else
37#define BYTE0(h) (((h) >> 8) & 0xFF)
38#define BYTE1(h) ((h) & 0xFF)
39#endif
40
41static map_word ixp4xx_read16(struct map_info *map, unsigned long ofs)
42{
43 map_word val;
44 val.x[0] = *(__u16 *) (map->map_priv_1 + ofs);
45 return val;
46}
47
48/*
49 * The IXP4xx expansion bus only allows 16-bit wide acceses
50 * when attached to a 16-bit wide device (such as the 28F128J3A),
51 * so we can't just memcpy_fromio().
52 */
53static void ixp4xx_copy_from(struct map_info *map, void *to,
54 unsigned long from, ssize_t len)
55{
56 int i;
57 u8 *dest = (u8 *) to;
58 u16 *src = (u16 *) (map->map_priv_1 + from);
59 u16 data;
60
61 for (i = 0; i < (len / 2); i++) {
62 data = src[i];
63 dest[i * 2] = BYTE0(data);
64 dest[i * 2 + 1] = BYTE1(data);
65 }
66
67 if (len & 1)
68 dest[len - 1] = BYTE0(src[i]);
69}
70
71/*
72 * Unaligned writes are ignored, causing the 8-bit
73 * probe to fail and proceed to the 16-bit probe (which succeeds).
74 */
75static void ixp4xx_probe_write16(struct map_info *map, map_word d, unsigned long adr)
76{
77 if (!(adr & 1))
78 *(__u16 *) (map->map_priv_1 + adr) = d.x[0];
79}
80
81/*
82 * Fast write16 function without the probing check above
83 */
84static void ixp4xx_write16(struct map_info *map, map_word d, unsigned long adr)
85{
86 *(__u16 *) (map->map_priv_1 + adr) = d.x[0];
87}
88
89struct ixp4xx_flash_info {
90 struct mtd_info *mtd;
91 struct map_info map;
92 struct mtd_partition *partitions;
93 struct resource *res;
94};
95
96static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
97
98static int ixp4xx_flash_remove(struct device *_dev)
99{
100 struct platform_device *dev = to_platform_device(_dev);
101 struct flash_platform_data *plat = dev->dev.platform_data;
102 struct ixp4xx_flash_info *info = dev_get_drvdata(&dev->dev);
103 map_word d;
104
105 dev_set_drvdata(&dev->dev, NULL);
106
107 if(!info)
108 return 0;
109
110 /*
111 * This is required for a soft reboot to work.
112 */
113 d.x[0] = 0xff;
114 ixp4xx_write16(&info->map, d, 0x55 * 0x2);
115
116 if (info->mtd) {
117 del_mtd_partitions(info->mtd);
118 map_destroy(info->mtd);
119 }
120 if (info->map.map_priv_1)
121 iounmap((void *) info->map.map_priv_1);
122
123 if (info->partitions)
124 kfree(info->partitions);
125
126 if (info->res) {
127 release_resource(info->res);
128 kfree(info->res);
129 }
130
131 if (plat->exit)
132 plat->exit();
133
134 /* Disable flash write */
135 *IXP4XX_EXP_CS0 &= ~IXP4XX_FLASH_WRITABLE;
136
137 return 0;
138}
139
140static int ixp4xx_flash_probe(struct device *_dev)
141{
142 struct platform_device *dev = to_platform_device(_dev);
143 struct flash_platform_data *plat = dev->dev.platform_data;
144 struct ixp4xx_flash_info *info;
145 int err = -1;
146
147 if (!plat)
148 return -ENODEV;
149
150 if (plat->init) {
151 err = plat->init();
152 if (err)
153 return err;
154 }
155
156 info = kmalloc(sizeof(struct ixp4xx_flash_info), GFP_KERNEL);
157 if(!info) {
158 err = -ENOMEM;
159 goto Error;
160 }
161 memzero(info, sizeof(struct ixp4xx_flash_info));
162
163 dev_set_drvdata(&dev->dev, info);
164
165 /*
166 * Enable flash write
167 * TODO: Move this out to board specific code
168 */
169 *IXP4XX_EXP_CS0 |= IXP4XX_FLASH_WRITABLE;
170
171 /*
172 * Tell the MTD layer we're not 1:1 mapped so that it does
173 * not attempt to do a direct access on us.
174 */
175 info->map.phys = NO_XIP;
176 info->map.size = dev->resource->end - dev->resource->start + 1;
177
178 /*
179 * We only support 16-bit accesses for now. If and when
180 * any board use 8-bit access, we'll fixup the driver to
181 * handle that.
182 */
183 info->map.bankwidth = 2;
184 info->map.name = dev->dev.bus_id;
185 info->map.read = ixp4xx_read16,
186 info->map.write = ixp4xx_probe_write16,
187 info->map.copy_from = ixp4xx_copy_from,
188
189 info->res = request_mem_region(dev->resource->start,
190 dev->resource->end - dev->resource->start + 1,
191 "IXP4XXFlash");
192 if (!info->res) {
193 printk(KERN_ERR "IXP4XXFlash: Could not reserve memory region\n");
194 err = -ENOMEM;
195 goto Error;
196 }
197
198 info->map.map_priv_1 = ioremap(dev->resource->start,
199 dev->resource->end - dev->resource->start + 1);
200 if (!info->map.map_priv_1) {
201 printk(KERN_ERR "IXP4XXFlash: Failed to ioremap region\n");
202 err = -EIO;
203 goto Error;
204 }
205
206 info->mtd = do_map_probe(plat->map_name, &info->map);
207 if (!info->mtd) {
208 printk(KERN_ERR "IXP4XXFlash: map_probe failed\n");
209 err = -ENXIO;
210 goto Error;
211 }
212 info->mtd->owner = THIS_MODULE;
213
214 /* Use the fast version */
215 info->map.write = ixp4xx_write16,
216
217 err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
218 if (err > 0) {
219 err = add_mtd_partitions(info->mtd, info->partitions, err);
220 if(err)
221 printk(KERN_ERR "Could not parse partitions\n");
222 }
223
224 if (err)
225 goto Error;
226
227 return 0;
228
229Error:
230 ixp4xx_flash_remove(_dev);
231 return err;
232}
233
234static struct device_driver ixp4xx_flash_driver = {
235 .name = "IXP4XX-Flash",
236 .bus = &platform_bus_type,
237 .probe = ixp4xx_flash_probe,
238 .remove = ixp4xx_flash_remove,
239};
240
241static int __init ixp4xx_flash_init(void)
242{
243 return driver_register(&ixp4xx_flash_driver);
244}
245
246static void __exit ixp4xx_flash_exit(void)
247{
248 driver_unregister(&ixp4xx_flash_driver);
249}
250
251
252module_init(ixp4xx_flash_init);
253module_exit(ixp4xx_flash_exit);
254
255MODULE_LICENSE("GPL");
Deepak Saxena82810a92005-09-28 16:42:54 -0700256MODULE_DESCRIPTION("MTD map driver for Intel IXP4xx systems");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257MODULE_AUTHOR("Deepak Saxena");
258