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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Thomas Gleixner69f34c92005-11-07 11:15:40 +00002 * $Id: ixp2000.c,v 1.9 2005/11/07 11:14:27 gleixner Exp $
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * drivers/mtd/maps/ixp2000.c
5 *
6 * Mapping for the Intel XScale IXP2000 based systems
7 *
8 * Copyright (C) 2002 Intel Corp.
9 * Copyright (C) 2003-2004 MontaVista Software, Inc.
10 *
11 * Original Author: Naeem M Afzal <naeem.m.afzal@intel.com>
12 * Maintainer: Deepak Saxena <dsaxena@plexity.net>
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
Thomas Gleixner69f34c92005-11-07 11:15:40 +000017 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 */
19
20#include <linux/module.h>
21#include <linux/types.h>
22#include <linux/init.h>
23#include <linux/kernel.h>
24#include <linux/string.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080025#include <linux/slab.h>
26#include <linux/ioport.h>
27#include <linux/device.h>
Linus Torvalds4fd5f822005-10-31 07:32:56 -080028#include <linux/platform_device.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080029
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/mtd/mtd.h>
31#include <linux/mtd/map.h>
32#include <linux/mtd/partitions.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34#include <asm/io.h>
35#include <asm/hardware.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <asm/mach/flash.h>
37
38#include <linux/reboot.h>
39
40struct ixp2000_flash_info {
41 struct mtd_info *mtd;
42 struct map_info map;
43 struct mtd_partition *partitions;
44 struct resource *res;
45 int nr_banks;
46};
47
48static inline unsigned long flash_bank_setup(struct map_info *map, unsigned long ofs)
Thomas Gleixner69f34c92005-11-07 11:15:40 +000049{
50 unsigned long (*set_bank)(unsigned long) =
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 (unsigned long(*)(unsigned long))map->map_priv_2;
52
53 return (set_bank ? set_bank(ofs) : ofs);
54}
55
56#ifdef __ARMEB__
57/*
Thomas Gleixner69f34c92005-11-07 11:15:40 +000058 * Rev A0 and A1 of IXP2400 silicon have a broken addressing unit which
59 * causes the lower address bits to be XORed with 0x11 on 8 bit accesses
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 * and XORed with 0x10 on 16 bit accesses. See the spec update, erratum 44.
61 */
62static int erratum44_workaround = 0;
63
64static inline unsigned long address_fix8_write(unsigned long addr)
65{
66 if (erratum44_workaround) {
67 return (addr ^ 3);
68 }
69 return addr;
70}
71#else
72
73#define address_fix8_write(x) (x)
74#endif
75
76static map_word ixp2000_flash_read8(struct map_info *map, unsigned long ofs)
77{
78 map_word val;
79
80 val.x[0] = *((u8 *)(map->map_priv_1 + flash_bank_setup(map, ofs)));
81 return val;
82}
83
84/*
85 * We can't use the standard memcpy due to the broken SlowPort
86 * address translation on rev A0 and A1 silicon and the fact that
87 * we have banked flash.
88 */
89static void ixp2000_flash_copy_from(struct map_info *map, void *to,
90 unsigned long from, ssize_t len)
91{
92 from = flash_bank_setup(map, from);
Thomas Gleixner69f34c92005-11-07 11:15:40 +000093 while(len--)
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 *(__u8 *) to++ = *(__u8 *)(map->map_priv_1 + from++);
95}
96
97static void ixp2000_flash_write8(struct map_info *map, map_word d, unsigned long ofs)
98{
99 *(__u8 *) (address_fix8_write(map->map_priv_1 +
100 flash_bank_setup(map, ofs))) = d.x[0];
101}
102
103static void ixp2000_flash_copy_to(struct map_info *map, unsigned long to,
104 const void *from, ssize_t len)
105{
106 to = flash_bank_setup(map, to);
107 while(len--) {
108 unsigned long tmp = address_fix8_write(map->map_priv_1 + to++);
109 *(__u8 *)(tmp) = *(__u8 *)(from++);
110 }
111}
112
113
Russell King3ae5eae2005-11-09 22:32:44 +0000114static int ixp2000_flash_remove(struct platform_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 struct flash_platform_data *plat = dev->dev.platform_data;
Russell King3ae5eae2005-11-09 22:32:44 +0000117 struct ixp2000_flash_info *info = platform_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Russell King3ae5eae2005-11-09 22:32:44 +0000119 platform_set_drvdata(dev, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
121 if(!info)
122 return 0;
123
124 if (info->mtd) {
125 del_mtd_partitions(info->mtd);
126 map_destroy(info->mtd);
127 }
128 if (info->map.map_priv_1)
129 iounmap((void *) info->map.map_priv_1);
130
Jesper Juhlfa671642005-11-07 01:01:27 -0800131 kfree(info->partitions);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133 if (info->res) {
134 release_resource(info->res);
135 kfree(info->res);
136 }
137
138 if (plat->exit)
139 plat->exit();
140
141 return 0;
142}
143
144
Russell King3ae5eae2005-11-09 22:32:44 +0000145static int ixp2000_flash_probe(struct platform_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146{
147 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 struct ixp2000_flash_data *ixp_data = dev->dev.platform_data;
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000149 struct flash_platform_data *plat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 struct ixp2000_flash_info *info;
151 unsigned long window_size;
152 int err = -1;
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 if (!ixp_data)
155 return -ENODEV;
156
157 plat = ixp_data->platform_data;
158 if (!plat)
159 return -ENODEV;
160
161 window_size = dev->resource->end - dev->resource->start + 1;
Russell King7d78c882005-11-17 15:47:30 +0000162 dev_info(&dev->dev, "Probe of IXP2000 flash(%d banks x %dMiB)\n",
163 ixp_data->nr_banks, ((u32)window_size >> 20));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
165 if (plat->width != 1) {
Russell King7d78c882005-11-17 15:47:30 +0000166 dev_err(&dev->dev, "IXP2000 MTD map only supports 8-bit mode, asking for %d\n",
167 plat->width * 8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 return -EIO;
169 }
170
171 info = kmalloc(sizeof(struct ixp2000_flash_info), GFP_KERNEL);
172 if(!info) {
173 err = -ENOMEM;
174 goto Error;
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000175 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 memzero(info, sizeof(struct ixp2000_flash_info));
177
Russell King3ae5eae2005-11-09 22:32:44 +0000178 platform_set_drvdata(dev, info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
180 /*
181 * Tell the MTD layer we're not 1:1 mapped so that it does
182 * not attempt to do a direct access on us.
183 */
184 info->map.phys = NO_XIP;
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 info->nr_banks = ixp_data->nr_banks;
187 info->map.size = ixp_data->nr_banks * window_size;
188 info->map.bankwidth = 1;
189
190 /*
191 * map_priv_2 is used to store a ptr to to the bank_setup routine
192 */
Lennert Buytenhekea176292005-11-07 08:09:05 +0000193 info->map.map_priv_2 = (unsigned long) ixp_data->bank_setup;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
195 info->map.name = dev->dev.bus_id;
196 info->map.read = ixp2000_flash_read8;
197 info->map.write = ixp2000_flash_write8;
198 info->map.copy_from = ixp2000_flash_copy_from;
199 info->map.copy_to = ixp2000_flash_copy_to;
200
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000201 info->res = request_mem_region(dev->resource->start,
202 dev->resource->end - dev->resource->start + 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 dev->dev.bus_id);
204 if (!info->res) {
Russell King7d78c882005-11-17 15:47:30 +0000205 dev_err(&dev->dev, "Could not reserve memory region\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 err = -ENOMEM;
207 goto Error;
208 }
209
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000210 info->map.map_priv_1 = (unsigned long) ioremap(dev->resource->start,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 dev->resource->end - dev->resource->start + 1);
212 if (!info->map.map_priv_1) {
Russell King7d78c882005-11-17 15:47:30 +0000213 dev_err(&dev->dev, "Failed to ioremap flash region\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 err = -EIO;
215 goto Error;
216 }
217
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218#if defined(__ARMEB__)
219 /*
220 * Enable erratum 44 workaround for NPUs with broken slowport
221 */
222
223 erratum44_workaround = ixp2000_has_broken_slowport();
Russell King7d78c882005-11-17 15:47:30 +0000224 dev_info(&dev->dev, "Erratum 44 workaround %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 erratum44_workaround ? "enabled" : "disabled");
226#endif
227
228 info->mtd = do_map_probe(plat->map_name, &info->map);
229 if (!info->mtd) {
Russell King7d78c882005-11-17 15:47:30 +0000230 dev_err(&dev->dev, "map_probe failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 err = -ENXIO;
232 goto Error;
233 }
234 info->mtd->owner = THIS_MODULE;
235
236 err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
237 if (err > 0) {
238 err = add_mtd_partitions(info->mtd, info->partitions, err);
239 if(err)
Russell King7d78c882005-11-17 15:47:30 +0000240 dev_err(&dev->dev, "Could not parse partitions\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 }
242
243 if (err)
244 goto Error;
245
246 return 0;
247
248Error:
Russell King3ae5eae2005-11-09 22:32:44 +0000249 ixp2000_flash_remove(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 return err;
251}
252
Russell King3ae5eae2005-11-09 22:32:44 +0000253static struct platform_driver ixp2000_flash_driver = {
Russell King7d78c882005-11-17 15:47:30 +0000254 .probe = ixp2000_flash_probe,
255 .remove = ixp2000_flash_remove,
Russell King3ae5eae2005-11-09 22:32:44 +0000256 .driver = {
257 .name = "IXP2000-Flash",
258 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259};
260
261static int __init ixp2000_flash_init(void)
262{
Russell King3ae5eae2005-11-09 22:32:44 +0000263 return platform_driver_register(&ixp2000_flash_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264}
265
266static void __exit ixp2000_flash_exit(void)
267{
Russell King3ae5eae2005-11-09 22:32:44 +0000268 platform_driver_unregister(&ixp2000_flash_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269}
270
271module_init(ixp2000_flash_init);
272module_exit(ixp2000_flash_exit);
273MODULE_LICENSE("GPL");
274MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");
275