diff options
Diffstat (limited to 'target/linux/amazon/files/drivers/mtd/maps/amazon.c')
| -rw-r--r-- | target/linux/amazon/files/drivers/mtd/maps/amazon.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/target/linux/amazon/files/drivers/mtd/maps/amazon.c b/target/linux/amazon/files/drivers/mtd/maps/amazon.c new file mode 100644 index 0000000000..3e7dc4f583 --- /dev/null +++ b/target/linux/amazon/files/drivers/mtd/maps/amazon.c @@ -0,0 +1,166 @@ +/* + * Handle mapping of the flash memory access routines + * on Amazon based devices. + * + * Copyright(C) 2004 peng.liu@infineon.com + * + * This code is GPLed + * + */ +// 000005:fchang 2005/6/2 Modified by Bingtao to double check if the EBU is enabled/disabled +// 506231:tc.chen 2005/06/23 increase firmware partition size form 192KB to 256KB +// 050701:linmars 2005/07/01 fix flash size wrong alignment after increase firmware partition +// 165001:henryhsu 2005/8/18 Remove the support for Intel flash because of 2.1 not enough rootfs partition size +// 165001:henryhsu 2005/9/7 Rolback to support INtel flash +// 509071:tc.chen 2005/09/07 Reduced flash writing time +// 511046:linmars 2005/11/04 change bootloader size from 128 into 64 +// 511241:linmars 2005/11/24 merge TaiChen's IRM patch + +// copyright 2005 infineon + +// copyright 2007 john crispin <blogic@openwrt.org> +// copyright 2007 felix fietkau <nbd@openwrt.org> + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <asm/io.h> + +#include <linux/init.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/map.h> +#include <linux/mtd/partitions.h> +#include <linux/mtd/cfi.h> +#include <linux/mutex.h> +#include <asm/amazon/amazon.h> + +#define AMAZON_PCI_ARB_CTL_ALT 0xb100205c +#define AMAZON_MTD_REG32( addr ) (*(volatile u32 *)(addr)) + + +static struct map_info amazon_map = { + .name = "AMAZON_FLASH", + .bankwidth = 2, + .size = 0x400000, +}; + +static map_word amazon_read16(struct map_info * map, unsigned long ofs) +{ + map_word temp; + ofs ^= 2; + temp.x[0] = *((__u16 *) (map->virt + ofs)); + return temp; +} + +static void amazon_write16(struct map_info *map, map_word d, unsigned long adr) +{ + adr ^= 2; + *((__u16 *) (map->virt + adr)) = d.x[0]; +} + +void amazon_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) +{ + u8 *p; + u8 *to_8; + ssize_t l = len; + from = (unsigned long) (from + map->virt); + p = (u8 *) from; + to_8 = (u8 *) to; + while(len--){ + *to_8++ = *p++; + } +} + +void amazon_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len) +{ + u8 *p = (u8*) from; + u8 *to_8; + to += (unsigned long) map->virt; + to_8 = (u8*)to; + while(len--){ + *p++ = *to_8++; + } +} + +#define UBOOT_SIZE 0x40000 + +static struct mtd_partition amazon_partitions[3] = { + { + name:"U-Boot", /* U-Boot firmware */ + offset:0x00000000, + size:UBOOT_SIZE , /* 128k */ + }, + { + name:"kernel", /* firmware */ + offset:UBOOT_SIZE, + size:0x00100000, /* 192K */ + }, + { + name:"rootfs", /* default partition */ + offset:0x00200000, + size:0x00200000, + }, +}; + + +unsigned long flash_start = 0x13000000; +unsigned long flash_size = 0x800000; +unsigned long uImage_size = 0x10000d; + +int find_uImage_size(unsigned long start_offset){ + unsigned long temp; + + printk("trying to find uImage and its size\n"); + amazon_copy_from(&amazon_map, &temp, start_offset + 12, 4); + printk("kernel size is %d \n", temp + 0x40); + return temp + 0x40; +} + +int __init init_amazon_mtd(void) +{ + int ret = 0; + struct mtd_info *mymtd = NULL; + struct mtd_partition *parts = NULL; + + *AMAZON_EBU_BUSCON0 = 0x1d7ff; + + amazon_map.read = amazon_read16; + amazon_map.write = amazon_write16; + amazon_map.copy_from = amazon_copy_from; + amazon_map.copy_to = amazon_copy_to; + + amazon_map.phys = flash_start; + amazon_map.virt = ioremap_nocache(flash_start, flash_size); + + if (!amazon_map.virt) { + printk(KERN_WARNING "Failed to ioremap!\n"); + return -EIO; + } + + mymtd = (struct mtd_info *) do_map_probe("cfi_probe", &amazon_map); + if (!mymtd) { + iounmap(amazon_map.virt); + printk("probing failed\n"); + return -ENXIO; + } + + mymtd->owner = THIS_MODULE; + parts = &amazon_partitions[0]; + amazon_partitions[2].offset = UBOOT_SIZE + find_uImage_size(amazon_partitions[1].offset); + amazon_partitions[1].size = mymtd->size - amazon_partitions[1].offset - (2 * mymtd->erasesize); + amazon_partitions[2].size = mymtd->size - amazon_partitions[2].offset - (2 * mymtd->erasesize); + add_mtd_partitions(mymtd, parts, 3); + return 0; +} + +static void __exit cleanup_amazon_mtd(void) +{ + /* FIXME! */ +} + +module_init(init_amazon_mtd); +module_exit(cleanup_amazon_mtd); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("john crispin blogic@openwrt.org"); +MODULE_DESCRIPTION("MTD map driver for AMAZON boards"); |