1 /* linux/drivers/mtd/maps/bast_flash.c
3 * Copyright (c) 2004-2005 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
6 * Simtec Bast (EB2410ITX) NOR MTD Mapping driver
9 * 20-Sep-2004 BJD Initial version
10 * 17-Jan-2005 BJD Add whole device if no partitions found
12 * $Id: bast-flash.c,v 1.2 2005/01/18 11:13:47 bjd Exp $
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.
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.
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
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 #include <linux/slab.h>
37 #include <linux/platform_device.h>
38 #include <linux/mtd/mtd.h>
39 #include <linux/mtd/map.h>
40 #include <linux/mtd/partitions.h>
43 #include <asm/mach/flash.h>
45 #include <asm/arch/map.h>
46 #include <asm/arch/bast-map.h>
47 #include <asm/arch/bast-cpld.h>
49 #ifdef CONFIG_MTD_BAST_MAXSIZE
50 #define AREA_MAXSIZE (CONFIG_MTD_BAST_MAXSIZE * SZ_1M)
52 #define AREA_MAXSIZE (32 * SZ_1M)
55 #define PFX "bast-flash: "
57 struct bast_flash_info {
60 struct mtd_partition *partitions;
61 struct resource *area;
64 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
66 static struct bast_flash_info *to_bast_info(struct device *dev)
68 return (struct bast_flash_info *)dev_get_drvdata(dev);
71 static void bast_flash_setrw(int to)
76 local_irq_save(flags);
77 val = __raw_readb(BAST_VA_CTRL3);
80 val |= BAST_CPLD_CTRL3_ROMWEN;
82 val &= ~BAST_CPLD_CTRL3_ROMWEN;
84 pr_debug("new cpld ctrl3=%02x\n", val);
86 __raw_writeb(val, BAST_VA_CTRL3);
87 local_irq_restore(flags);
90 static int bast_flash_remove(struct device *dev)
92 struct bast_flash_info *info = to_bast_info(dev);
94 dev_set_drvdata(dev, NULL);
99 if (info->map.virt != NULL)
100 iounmap(info->map.virt);
103 del_mtd_partitions(info->mtd);
104 map_destroy(info->mtd);
107 kfree(info->partitions);
110 release_resource(info->area);
119 static int bast_flash_probe(struct device *dev)
121 struct platform_device *pdev = to_platform_device(dev);
122 struct bast_flash_info *info;
123 struct resource *res;
126 info = kmalloc(sizeof(*info), GFP_KERNEL);
128 printk(KERN_ERR PFX "no memory for flash info\n");
133 memzero(info, sizeof(*info));
134 dev_set_drvdata(dev, info);
136 res = pdev->resource; /* assume that the flash has one resource */
138 info->map.phys = res->start;
139 info->map.size = res->end - res->start + 1;
140 info->map.name = dev->bus_id;
141 info->map.bankwidth = 2;
143 if (info->map.size > AREA_MAXSIZE)
144 info->map.size = AREA_MAXSIZE;
146 pr_debug("%s: area %08lx, size %ld\n", __FUNCTION__,
147 info->map.phys, info->map.size);
149 info->area = request_mem_region(res->start, info->map.size,
151 if (info->area == NULL) {
152 printk(KERN_ERR PFX "cannot reserve flash memory region\n");
157 info->map.virt = ioremap(res->start, info->map.size);
158 pr_debug("%s: virt at %08x\n", __FUNCTION__, (int)info->map.virt);
160 if (info->map.virt == 0) {
161 printk(KERN_ERR PFX "failed to ioremap() region\n");
166 simple_map_init(&info->map);
168 /* enable the write to the flash area */
172 /* probe for the device(s) */
174 info->mtd = do_map_probe("jedec_probe", &info->map);
175 if (info->mtd == NULL)
176 info->mtd = do_map_probe("cfi_probe", &info->map);
178 if (info->mtd == NULL) {
179 printk(KERN_ERR PFX "map_probe() failed\n");
184 /* mark ourselves as the owner */
185 info->mtd->owner = THIS_MODULE;
187 err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
189 err = add_mtd_partitions(info->mtd, info->partitions, err);
191 printk(KERN_ERR PFX "cannot add/parse partitions\n");
193 err = add_mtd_device(info->mtd);
199 /* fall through to exit error */
202 bast_flash_remove(dev);
206 static struct device_driver bast_flash_driver = {
208 .bus = &platform_bus_type,
209 .probe = bast_flash_probe,
210 .remove = bast_flash_remove,
213 static int __init bast_flash_init(void)
215 printk("BAST NOR-Flash Driver, (c) 2004 Simtec Electronics\n");
216 return driver_register(&bast_flash_driver);
219 static void __exit bast_flash_exit(void)
221 driver_unregister(&bast_flash_driver);
224 module_init(bast_flash_init);
225 module_exit(bast_flash_exit);
227 MODULE_LICENSE("GPL");
228 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
229 MODULE_DESCRIPTION("BAST MTD Map driver");