2 * $Id: ixp4xx.c,v 1.12 2005/11/07 11:14:27 gleixner Exp $
4 * drivers/mtd/maps/ixp4xx.c
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
10 * Original Author: Intel Corporation
11 * Maintainer: Deepak Saxena <dsaxena@mvista.com>
13 * Copyright (C) 2002 Intel Corporation
14 * Copyright (C) 2003-2004 MontaVista Software, Inc.
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/slab.h>
24 #include <linux/ioport.h>
25 #include <linux/device.h>
26 #include <linux/platform_device.h>
28 #include <linux/mtd/mtd.h>
29 #include <linux/mtd/map.h>
30 #include <linux/mtd/partitions.h>
33 #include <asm/mach/flash.h>
35 #include <linux/reboot.h>
38 #define BYTE0(h) ((h) & 0xFF)
39 #define BYTE1(h) (((h) >> 8) & 0xFF)
41 #define BYTE0(h) (((h) >> 8) & 0xFF)
42 #define BYTE1(h) ((h) & 0xFF)
45 static map_word ixp4xx_read16(struct map_info *map, unsigned long ofs)
48 val.x[0] = le16_to_cpu(readw(map->virt + ofs));
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().
57 static void ixp4xx_copy_from(struct map_info *map, void *to,
58 unsigned long from, ssize_t len)
62 void __iomem *src = map->virt + from;
65 for (i = 0; i < (len / 2); i++) {
66 data = le16_to_cpu(readw(src + 2*i));
67 dest[i * 2] = BYTE0(data);
68 dest[i * 2 + 1] = BYTE1(data);
72 dest[len - 1] = BYTE0(le16_to_cpu(readw(src + 2*i)));
76 * Unaligned writes are ignored, causing the 8-bit
77 * probe to fail and proceed to the 16-bit probe (which succeeds).
79 static void ixp4xx_probe_write16(struct map_info *map, map_word d, unsigned long adr)
82 writew(cpu_to_le16(d.x[0]), map->virt + adr);
86 * Fast write16 function without the probing check above
88 static void ixp4xx_write16(struct map_info *map, map_word d, unsigned long adr)
90 writew(cpu_to_le16(d.x[0]), map->virt + adr);
93 struct ixp4xx_flash_info {
96 struct mtd_partition *partitions;
100 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
102 static int ixp4xx_flash_remove(struct platform_device *dev)
104 struct flash_platform_data *plat = dev->dev.platform_data;
105 struct ixp4xx_flash_info *info = platform_get_drvdata(dev);
107 platform_set_drvdata(dev, NULL);
113 del_mtd_partitions(info->mtd);
114 map_destroy(info->mtd);
117 iounmap(info->map.virt);
119 kfree(info->partitions);
122 release_resource(info->res);
132 static int ixp4xx_flash_probe(struct platform_device *dev)
134 struct flash_platform_data *plat = dev->dev.platform_data;
135 struct ixp4xx_flash_info *info;
147 info = kmalloc(sizeof(struct ixp4xx_flash_info), GFP_KERNEL);
152 memzero(info, sizeof(struct ixp4xx_flash_info));
154 platform_set_drvdata(dev, info);
157 * Tell the MTD layer we're not 1:1 mapped so that it does
158 * not attempt to do a direct access on us.
160 info->map.phys = NO_XIP;
161 info->map.size = dev->resource->end - dev->resource->start + 1;
164 * We only support 16-bit accesses for now. If and when
165 * any board use 8-bit access, we'll fixup the driver to
168 info->map.bankwidth = 2;
169 info->map.name = dev->dev.bus_id;
170 info->map.read = ixp4xx_read16,
171 info->map.write = ixp4xx_probe_write16,
172 info->map.copy_from = ixp4xx_copy_from,
174 info->res = request_mem_region(dev->resource->start,
175 dev->resource->end - dev->resource->start + 1,
178 printk(KERN_ERR "IXP4XXFlash: Could not reserve memory region\n");
183 info->map.virt = ioremap(dev->resource->start,
184 dev->resource->end - dev->resource->start + 1);
185 if (!info->map.virt) {
186 printk(KERN_ERR "IXP4XXFlash: Failed to ioremap region\n");
191 info->mtd = do_map_probe(plat->map_name, &info->map);
193 printk(KERN_ERR "IXP4XXFlash: map_probe failed\n");
197 info->mtd->owner = THIS_MODULE;
199 /* Use the fast version */
200 info->map.write = ixp4xx_write16,
202 err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
204 err = add_mtd_partitions(info->mtd, info->partitions, err);
206 printk(KERN_ERR "Could not parse partitions\n");
215 ixp4xx_flash_remove(dev);
219 static struct platform_driver ixp4xx_flash_driver = {
220 .probe = ixp4xx_flash_probe,
221 .remove = ixp4xx_flash_remove,
223 .name = "IXP4XX-Flash",
227 static int __init ixp4xx_flash_init(void)
229 return platform_driver_register(&ixp4xx_flash_driver);
232 static void __exit ixp4xx_flash_exit(void)
234 platform_driver_unregister(&ixp4xx_flash_driver);
238 module_init(ixp4xx_flash_init);
239 module_exit(ixp4xx_flash_exit);
241 MODULE_LICENSE("GPL");
242 MODULE_DESCRIPTION("MTD map driver for Intel IXP4xx systems");
243 MODULE_AUTHOR("Deepak Saxena");