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1/* linux/drivers/mtd/maps/bast_flash.c
2 *
3 * Copyright (c) 2004-2005 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 *
6 * Simtec Bast (EB2410ITX) NOR MTD Mapping driver
7 *
8 * Changelog:
9 * 20-Sep-2004 BJD Initial version
10 * 17-Jan-2005 BJD Add whole device if no partitions found
11 *
12 * $Id: bast-flash.c,v 1.2 2005/01/18 11:13:47 bjd Exp $
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 as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27*/
28
29#include <linux/module.h>
30#include <linux/types.h>
31#include <linux/init.h>
32#include <linux/kernel.h>
33#include <linux/string.h>
34#include <linux/ioport.h>
35#include <linux/device.h>
36
37#include <linux/mtd/mtd.h>
38#include <linux/mtd/map.h>
39#include <linux/mtd/partitions.h>
40
41#include <asm/io.h>
42#include <asm/mach-types.h>
43#include <asm/mach/flash.h>
44
45#include <asm/arch/map.h>
46#include <asm/arch/bast-map.h>
47#include <asm/arch/bast-cpld.h>
48
49#ifdef CONFIG_MTD_BAST_MAXSIZE
50#define AREA_MAXSIZE (CONFIG_MTD_BAST_MAXSIZE * SZ_1M)
51#else
52#define AREA_MAXSIZE (32 * SZ_1M)
53#endif
54
55#define PFX "bast-flash: "
56
57struct bast_flash_info {
58 struct mtd_info *mtd;
59 struct map_info map;
60 struct mtd_partition *partitions;
61 struct resource *area;
62};
63
64static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
65
66static struct bast_flash_info *to_bast_info(struct device *dev)
67{
68 return (struct bast_flash_info *)dev_get_drvdata(dev);
69}
70
71static void bast_flash_setrw(int to)
72{
73 unsigned int val;
74 unsigned long flags;
75
76 local_irq_save(flags);
77 val = __raw_readb(BAST_VA_CTRL3);
78
79 if (to)
80 val |= BAST_CPLD_CTRL3_ROMWEN;
81 else
82 val &= ~BAST_CPLD_CTRL3_ROMWEN;
83
84 pr_debug("new cpld ctrl3=%02x\n", val);
85
86 __raw_writeb(val, BAST_VA_CTRL3);
87 local_irq_restore(flags);
88}
89
90static int bast_flash_remove(struct device *dev)
91{
92 struct bast_flash_info *info = to_bast_info(dev);
93
94 dev_set_drvdata(dev, NULL);
95
96 if (info == NULL)
97 return 0;
98
99 if (info->map.virt != NULL)
100 iounmap(info->map.virt);
101
102 if (info->mtd) {
103 del_mtd_partitions(info->mtd);
104 map_destroy(info->mtd);
105 }
106
107 if (info->partitions)
108 kfree(info->partitions);
109
110 if (info->area) {
111 release_resource(info->area);
112 kfree(info->area);
113 }
114
115 kfree(info);
116
117 return 0;
118}
119
120static int bast_flash_probe(struct device *dev)
121{
122 struct platform_device *pdev = to_platform_device(dev);
123 struct bast_flash_info *info;
124 struct resource *res;
125 int err = 0;
126
127 info = kmalloc(sizeof(*info), GFP_KERNEL);
128 if (info == NULL) {
129 printk(KERN_ERR PFX "no memory for flash info\n");
130 err = -ENOMEM;
131 goto exit_error;
132 }
133
134 memzero(info, sizeof(*info));
135 dev_set_drvdata(dev, info);
136
137 res = pdev->resource; /* assume that the flash has one resource */
138
139 info->map.phys = res->start;
140 info->map.size = res->end - res->start + 1;
141 info->map.name = dev->bus_id;
142 info->map.bankwidth = 2;
143
144 if (info->map.size > AREA_MAXSIZE)
145 info->map.size = AREA_MAXSIZE;
146
147 pr_debug("%s: area %08lx, size %ld\n", __FUNCTION__,
148 info->map.phys, info->map.size);
149
150 info->area = request_mem_region(res->start, info->map.size,
151 pdev->name);
152 if (info->area == NULL) {
153 printk(KERN_ERR PFX "cannot reserve flash memory region\n");
154 err = -ENOENT;
155 goto exit_error;
156 }
157
158 info->map.virt = ioremap(res->start, info->map.size);
159 pr_debug("%s: virt at %08x\n", __FUNCTION__, (int)info->map.virt);
160
161 if (info->map.virt == 0) {
162 printk(KERN_ERR PFX "failed to ioremap() region\n");
163 err = -EIO;
164 goto exit_error;
165 }
166
167 simple_map_init(&info->map);
168
169 /* enable the write to the flash area */
170
171 bast_flash_setrw(1);
172
173 /* probe for the device(s) */
174
175 info->mtd = do_map_probe("jedec_probe", &info->map);
176 if (info->mtd == NULL)
177 info->mtd = do_map_probe("cfi_probe", &info->map);
178
179 if (info->mtd == NULL) {
180 printk(KERN_ERR PFX "map_probe() failed\n");
181 err = -ENXIO;
182 goto exit_error;
183 }
184
185 /* mark ourselves as the owner */
186 info->mtd->owner = THIS_MODULE;
187
188 err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
189 if (err > 0) {
190 err = add_mtd_partitions(info->mtd, info->partitions, err);
191 if (err)
192 printk(KERN_ERR PFX "cannot add/parse partitions\n");
193 } else {
194 err = add_mtd_device(info->mtd);
195 }
196
197 if (err == 0)
198 return 0;
199
200 /* fall through to exit error */
201
202 exit_error:
203 bast_flash_remove(dev);
204 return err;
205}
206
207static struct device_driver bast_flash_driver = {
208 .name = "bast-nor",
209 .bus = &platform_bus_type,
210 .probe = bast_flash_probe,
211 .remove = bast_flash_remove,
212};
213
214static int __init bast_flash_init(void)
215{
216 printk("BAST NOR-Flash Driver, (c) 2004 Simtec Electronics\n");
217 return driver_register(&bast_flash_driver);
218}
219
220static void __exit bast_flash_exit(void)
221{
222 driver_unregister(&bast_flash_driver);
223}
224
225module_init(bast_flash_init);
226module_exit(bast_flash_exit);
227
228MODULE_LICENSE("GPL");
229MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
230MODULE_DESCRIPTION("BAST MTD Map driver");