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>
24 #include <linux/module.h>
25 #include <linux/types.h>
26 #include <linux/kernel.h>
29 #include <linux/init.h>
30 #include <linux/mtd/mtd.h>
31 #include <linux/mtd/map.h>
32 #include <linux/mtd/partitions.h>
33 #include <linux/mtd/cfi.h>
34 #include <linux/mutex.h>
35 #include <asm/amazon/amazon.h>
37 #define AMAZON_PCI_ARB_CTL_ALT 0xb100205c
38 #define AMAZON_MTD_REG32( addr ) (*(volatile u32 *)(addr))
41 static struct map_info amazon_map = {
42 .name = "AMAZON_FLASH",
47 static map_word amazon_read16(struct map_info * map, unsigned long ofs)
51 temp.x[0] = *((__u16 *) (map->virt + ofs));
55 static void amazon_write16(struct map_info *map, map_word d, unsigned long adr)
58 *((__u16 *) (map->virt + adr)) = d.x[0];
61 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 */
106 unsigned long flash_start = 0x13000000;
107 unsigned long flash_size = 0x800000;
108 unsigned long uImage_size = 0x10000d;
110 int find_uImage_size(unsigned long start_offset){
113 printk("trying to find uImage and its size\n");
114 amazon_copy_from(&amazon_map, &temp, start_offset + 12, 4);
115 printk("kernel size is %d \n", temp + 0x40);
119 int __init init_amazon_mtd(void)
122 struct mtd_info *mymtd = NULL;
123 struct mtd_partition *parts = NULL;
125 *AMAZON_EBU_BUSCON0 = 0x1d7ff;
127 amazon_map.read = amazon_read16;
128 amazon_map.write = amazon_write16;
129 amazon_map.copy_from = amazon_copy_from;
130 amazon_map.copy_to = amazon_copy_to;
132 amazon_map.phys = flash_start;
133 amazon_map.virt = ioremap_nocache(flash_start, flash_size);
135 if (!amazon_map.virt) {
136 printk(KERN_WARNING "Failed to ioremap!\n");
140 mymtd = (struct mtd_info *) do_map_probe("cfi_probe", &amazon_map);
142 iounmap(amazon_map.virt);
143 printk("probing failed\n");
147 mymtd->owner = THIS_MODULE;
148 parts = &amazon_partitions[0];
149 amazon_partitions[2].offset = UBOOT_SIZE + find_uImage_size(amazon_partitions[1].offset);
150 amazon_partitions[1].size = mymtd->size - amazon_partitions[1].offset - (2 * mymtd->erasesize);
151 amazon_partitions[2].size = mymtd->size - amazon_partitions[2].offset - (2 * mymtd->erasesize);
152 add_mtd_partitions(mymtd, parts, 3);
156 static void __exit cleanup_amazon_mtd(void)
161 module_init(init_amazon_mtd);
162 module_exit(cleanup_amazon_mtd);
164 MODULE_LICENSE("GPL");
165 MODULE_AUTHOR("john crispin blogic@openwrt.org");
166 MODULE_DESCRIPTION("MTD map driver for AMAZON boards");