2 * Handle mapping of the flash memory access routines
3 * on Amazon based devices.
5 * Copyright(C) 2004 peng.liu@infineon.com
10 // 000005:fchang 2005/6/2 Modified by Bingtao to double check if the EBU is enabled/disabled
11 // 506231:tc.chen 2005/06/23 increase firmware partition size form 192KB to 256KB
12 // 050701:linmars 2005/07/01 fix flash size wrong alignment after increase firmware partition
13 // 165001:henryhsu 2005/8/18 Remove the support for Intel flash because of 2.1 not enough rootfs partition size
14 // 165001:henryhsu 2005/9/7 Rolback to support INtel flash
15 // 509071:tc.chen 2005/09/07 Reduced flash writing time
16 // 511046:linmars 2005/11/04 change bootloader size from 128 into 64
17 // 511241:linmars 2005/11/24 merge TaiChen's IRM patch
19 // copyright 2005 infineon
21 // copyright 2007 john crispin <blogic@openwrt.org>
22 // copyright 2007 felix fietkau <nbd@openwrt.org>
23 // copyright 2009 hauke mehrtens <hauke@hauke-m.de>
25 #include <linux/module.h>
26 #include <linux/types.h>
27 #include <linux/kernel.h>
30 #include <linux/init.h>
31 #include <linux/mtd/mtd.h>
32 #include <linux/mtd/map.h>
33 #include <linux/mtd/partitions.h>
34 #include <linux/mtd/cfi.h>
35 #include <linux/mutex.h>
36 #include <linux/platform_device.h>
37 #include <asm/amazon/amazon.h>
39 #define AMAZON_PCI_ARB_CTL_ALT 0xb100205c
40 #define AMAZON_MTD_REG32( addr ) (*(volatile u32 *)(addr))
43 static struct map_info amazon_map = {
44 .name = "AMAZON_FLASH",
48 static map_word amazon_read16(struct map_info * map, unsigned long ofs)
52 temp.x[0] = *((__u16 *) (map->virt + ofs));
56 static void amazon_write16(struct map_info *map, map_word d, unsigned long adr)
59 *((__u16 *) (map->virt + adr)) = d.x[0];
62 void amazon_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
66 from = (unsigned long) (from + map->virt);
74 void amazon_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
78 to += (unsigned long) map->virt;
85 #define UBOOT_SIZE 0x40000
87 static struct mtd_partition amazon_partitions[3] = {
89 name:"U-Boot", /* U-Boot firmware */
91 size:UBOOT_SIZE , /* 128k */
94 name:"kernel", /* firmware */
96 size:0x00100000, /* 192K */
99 name:"rootfs", /* default partition */
105 unsigned long uImage_size = 0x10000d;
107 int find_uImage_size(unsigned long start_offset)
111 amazon_copy_from(&amazon_map, &magic, start_offset, 4);
112 if (!(ntohl(magic) == 0x27051956)) {
113 printk(KERN_INFO "amazon_mtd: invalid magic (0x%08X) of kernel at 0x%08lx \n", ntohl(magic), start_offset);
116 amazon_copy_from(&amazon_map, &temp, start_offset + 12, 4);
117 printk(KERN_INFO "amazon_mtd: kernel size is %ld \n", temp + 0x40);
121 static int amazon_mtd_probe(struct platform_device *dev)
123 unsigned long uimage_size;
124 struct mtd_info *mymtd = NULL;
125 struct mtd_partition *parts = NULL;
127 *AMAZON_EBU_BUSCON0 = 0x1d7ff;
129 amazon_map.read = amazon_read16;
130 amazon_map.write = amazon_write16;
131 amazon_map.copy_from = amazon_copy_from;
132 amazon_map.copy_to = amazon_copy_to;
134 amazon_map.phys = dev->resource->start;
135 amazon_map.size = dev->resource->end - amazon_map.phys + 1;
136 amazon_map.virt = ioremap_nocache(amazon_map.phys, amazon_map.size);
138 if (!amazon_map.virt) {
139 printk(KERN_WARNING "amazon_mtd: Failed to ioremap!\n");
143 mymtd = (struct mtd_info *) do_map_probe("cfi_probe", &amazon_map);
145 iounmap(amazon_map.virt);
146 printk(KERN_WARNING "amazon_mtd: probing failed\n");
150 mymtd->owner = THIS_MODULE;
151 parts = &amazon_partitions[0];
153 /* Some Samsung devices are containing a 16 MB flash chip with a bigger U-Boot partition. */
154 if(mymtd->size == 0x01000000 && mymtd->erasesize == 0x00020000) {
155 printk(KERN_INFO "amazon_mtd: Found big flash chip!\n");
156 amazon_partitions[0].size = 0x60000;
157 amazon_partitions[1].offset = 0x60000;
158 uimage_size = find_uImage_size(amazon_partitions[1].offset);
159 amazon_partitions[1].size = uimage_size;
160 amazon_partitions[2].offset = 0x60000 + uimage_size;
161 amazon_partitions[2].size = mymtd->size - amazon_partitions[2].offset - mymtd->erasesize;
163 printk(KERN_INFO "amazon_mtd: Found small flash chip!\n");
164 uimage_size = find_uImage_size(amazon_partitions[1].offset);
165 amazon_partitions[1].size = uimage_size;
166 amazon_partitions[2].offset = UBOOT_SIZE + uimage_size;
167 amazon_partitions[2].size = mymtd->size - amazon_partitions[2].offset - (2 * mymtd->erasesize);
170 mtd_device_register(mymtd, parts, 3);
172 printk(KERN_INFO "amazon_mtd: added %s flash with %dMB\n",
173 amazon_map.name, ((int)mymtd->size) >> 20);
177 static struct platform_driver amazon_mtd_driver = {
178 .probe = amazon_mtd_probe,
180 .name = "amazon_mtd",
181 .owner = THIS_MODULE,
185 static int __init amazon_mtd_init(void)
187 int ret = platform_driver_register(&amazon_mtd_driver);
189 printk(KERN_WARNING "amazon_mtd: error registering platfom driver!\n");
193 static void __exit amazon_mtd_cleanup(void)
195 platform_driver_unregister(&amazon_mtd_driver);
198 module_init(amazon_mtd_init);
199 module_exit(amazon_mtd_cleanup);
201 MODULE_LICENSE("GPL");
202 MODULE_AUTHOR("john crispin blogic@openwrt.org");
203 MODULE_DESCRIPTION("MTD map driver for AMAZON boards");