blob: 471553a3da69fa6f25edbf688fe9075b1addec1a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Thomas Gleixner69f34c92005-11-07 11:15:40 +00002 * $Id: ixp4xx.c,v 1.12 2005/11/07 11:14:27 gleixner Exp $
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
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>
Tim Schmielau4e57b682005-10-30 15:03:48 -080023#include <linux/slab.h>
24#include <linux/ioport.h>
25#include <linux/device.h>
Linus Torvalds4fd5f822005-10-31 07:32:56 -080026#include <linux/platform_device.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080027
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/mtd/mtd.h>
29#include <linux/mtd/map.h>
30#include <linux/mtd/partitions.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080031
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <asm/mach/flash.h>
34
35#include <linux/reboot.h>
36
37#ifndef __ARMEB__
38#define BYTE0(h) ((h) & 0xFF)
39#define BYTE1(h) (((h) >> 8) & 0xFF)
40#else
41#define BYTE0(h) (((h) >> 8) & 0xFF)
42#define BYTE1(h) ((h) & 0xFF)
43#endif
44
45static map_word ixp4xx_read16(struct map_info *map, unsigned long ofs)
46{
47 map_word val;
David Vrabel9090ed02005-11-01 16:46:19 +000048 val.x[0] = le16_to_cpu(readw(map->virt + ofs));
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 return val;
50}
51
52/*
53 * The IXP4xx expansion bus only allows 16-bit wide acceses
54 * when attached to a 16-bit wide device (such as the 28F128J3A),
55 * so we can't just memcpy_fromio().
56 */
57static void ixp4xx_copy_from(struct map_info *map, void *to,
58 unsigned long from, ssize_t len)
59{
60 int i;
61 u8 *dest = (u8 *) to;
David Vrabel9090ed02005-11-01 16:46:19 +000062 void __iomem *src = map->virt + from;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 u16 data;
64
65 for (i = 0; i < (len / 2); i++) {
David Vrabel9090ed02005-11-01 16:46:19 +000066 data = le16_to_cpu(readw(src + 2*i));
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 dest[i * 2] = BYTE0(data);
68 dest[i * 2 + 1] = BYTE1(data);
69 }
70
71 if (len & 1)
David Vrabel9090ed02005-11-01 16:46:19 +000072 dest[len - 1] = BYTE0(le16_to_cpu(readw(src + 2*i)));
Linus Torvalds1da177e2005-04-16 15:20:36 -070073}
74
Thomas Gleixner69f34c92005-11-07 11:15:40 +000075/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 * Unaligned writes are ignored, causing the 8-bit
77 * probe to fail and proceed to the 16-bit probe (which succeeds).
78 */
79static void ixp4xx_probe_write16(struct map_info *map, map_word d, unsigned long adr)
80{
81 if (!(adr & 1))
David Vrabel9090ed02005-11-01 16:46:19 +000082 writew(cpu_to_le16(d.x[0]), map->virt + adr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083}
84
Thomas Gleixner69f34c92005-11-07 11:15:40 +000085/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 * Fast write16 function without the probing check above
87 */
88static void ixp4xx_write16(struct map_info *map, map_word d, unsigned long adr)
89{
David Vrabel9090ed02005-11-01 16:46:19 +000090 writew(cpu_to_le16(d.x[0]), map->virt + adr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091}
92
93struct ixp4xx_flash_info {
94 struct mtd_info *mtd;
95 struct map_info map;
96 struct mtd_partition *partitions;
97 struct resource *res;
98};
99
100static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
101
102static int ixp4xx_flash_remove(struct device *_dev)
103{
104 struct platform_device *dev = to_platform_device(_dev);
105 struct flash_platform_data *plat = dev->dev.platform_data;
106 struct ixp4xx_flash_info *info = dev_get_drvdata(&dev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
108 dev_set_drvdata(&dev->dev, NULL);
109
110 if(!info)
111 return 0;
112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 if (info->mtd) {
114 del_mtd_partitions(info->mtd);
115 map_destroy(info->mtd);
116 }
David Vrabel9090ed02005-11-01 16:46:19 +0000117 if (info->map.virt)
118 iounmap(info->map.virt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120 if (info->partitions)
121 kfree(info->partitions);
122
123 if (info->res) {
124 release_resource(info->res);
125 kfree(info->res);
126 }
127
128 if (plat->exit)
129 plat->exit();
130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 return 0;
132}
133
134static int ixp4xx_flash_probe(struct device *_dev)
135{
136 struct platform_device *dev = to_platform_device(_dev);
137 struct flash_platform_data *plat = dev->dev.platform_data;
138 struct ixp4xx_flash_info *info;
139 int err = -1;
140
141 if (!plat)
142 return -ENODEV;
143
144 if (plat->init) {
145 err = plat->init();
146 if (err)
147 return err;
148 }
149
150 info = kmalloc(sizeof(struct ixp4xx_flash_info), GFP_KERNEL);
151 if(!info) {
152 err = -ENOMEM;
153 goto Error;
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000154 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 memzero(info, sizeof(struct ixp4xx_flash_info));
156
157 dev_set_drvdata(&dev->dev, info);
158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 /*
160 * Tell the MTD layer we're not 1:1 mapped so that it does
161 * not attempt to do a direct access on us.
162 */
163 info->map.phys = NO_XIP;
164 info->map.size = dev->resource->end - dev->resource->start + 1;
165
166 /*
167 * We only support 16-bit accesses for now. If and when
168 * any board use 8-bit access, we'll fixup the driver to
169 * handle that.
170 */
171 info->map.bankwidth = 2;
172 info->map.name = dev->dev.bus_id;
173 info->map.read = ixp4xx_read16,
174 info->map.write = ixp4xx_probe_write16,
175 info->map.copy_from = ixp4xx_copy_from,
176
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000177 info->res = request_mem_region(dev->resource->start,
178 dev->resource->end - dev->resource->start + 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 "IXP4XXFlash");
180 if (!info->res) {
181 printk(KERN_ERR "IXP4XXFlash: Could not reserve memory region\n");
182 err = -ENOMEM;
183 goto Error;
184 }
185
David Vrabel9090ed02005-11-01 16:46:19 +0000186 info->map.virt = ioremap(dev->resource->start,
187 dev->resource->end - dev->resource->start + 1);
188 if (!info->map.virt) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 printk(KERN_ERR "IXP4XXFlash: Failed to ioremap region\n");
190 err = -EIO;
191 goto Error;
192 }
193
194 info->mtd = do_map_probe(plat->map_name, &info->map);
195 if (!info->mtd) {
196 printk(KERN_ERR "IXP4XXFlash: map_probe failed\n");
197 err = -ENXIO;
198 goto Error;
199 }
200 info->mtd->owner = THIS_MODULE;
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 /* Use the fast version */
203 info->map.write = ixp4xx_write16,
204
205 err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
206 if (err > 0) {
207 err = add_mtd_partitions(info->mtd, info->partitions, err);
208 if(err)
209 printk(KERN_ERR "Could not parse partitions\n");
210 }
211
212 if (err)
213 goto Error;
214
215 return 0;
216
217Error:
218 ixp4xx_flash_remove(_dev);
219 return err;
220}
221
222static struct device_driver ixp4xx_flash_driver = {
223 .name = "IXP4XX-Flash",
224 .bus = &platform_bus_type,
225 .probe = ixp4xx_flash_probe,
226 .remove = ixp4xx_flash_remove,
227};
228
229static int __init ixp4xx_flash_init(void)
230{
231 return driver_register(&ixp4xx_flash_driver);
232}
233
234static void __exit ixp4xx_flash_exit(void)
235{
236 driver_unregister(&ixp4xx_flash_driver);
237}
238
239
240module_init(ixp4xx_flash_init);
241module_exit(ixp4xx_flash_exit);
242
243MODULE_LICENSE("GPL");
Deepak Saxena82810a92005-09-28 16:42:54 -0700244MODULE_DESCRIPTION("MTD map driver for Intel IXP4xx systems");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245MODULE_AUTHOR("Deepak Saxena");