-/*
- * Handle mapping of the flash memory access routines on the SBC8240 board.
- *
- * Carolyn Smith, Tektronix, Inc.
- *
- * This code is GPLed
- */
-
-/*
- * The SBC8240 has 2 flash banks.
- * Bank 0 is a 512 KiB AMD AM29F040B; 8 x 64 KiB sectors.
- * It contains the U-Boot code (7 sectors) and the environment (1 sector).
- * Bank 1 is 4 x 1 MiB AMD AM29LV800BT; 15 x 64 KiB sectors, 1 x 32 KiB sector,
- * 2 x 8 KiB sectors, 1 x 16 KiB sectors.
- * Both parts are JEDEC compatible.
- */
-
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <asm/io.h>
-
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/map.h>
-#include <linux/mtd/cfi.h>
-
-#ifdef CONFIG_MTD_PARTITIONS
-#include <linux/mtd/partitions.h>
-#endif
-
-#define DEBUG
-
-#ifdef DEBUG
-# define debugk(fmt,args...) printk(fmt ,##args)
-#else
-# define debugk(fmt,args...)
-#endif
-
-
-#define WINDOW_ADDR0 0xFFF00000 /* 512 KiB */
-#define WINDOW_SIZE0 0x00080000
-#define BUSWIDTH0 1
-
-#define WINDOW_ADDR1 0xFF000000 /* 4 MiB */
-#define WINDOW_SIZE1 0x00400000
-#define BUSWIDTH1 8
-
-#define MSG_PREFIX "sbc8240:" /* prefix for our printk()'s */
-#define MTDID "sbc8240-%d" /* for mtdparts= partitioning */
-
-
-static struct map_info sbc8240_map[2] = {
- {
- .name = "sbc8240 Flash Bank #0",
- .size = WINDOW_SIZE0,
- .bankwidth = BUSWIDTH0,
- },
- {
- .name = "sbc8240 Flash Bank #1",
- .size = WINDOW_SIZE1,
- .bankwidth = BUSWIDTH1,
- }
-};
-
-#define NUM_FLASH_BANKS ARRAY_SIZE(sbc8240_map)
-
-/*
- * The following defines the partition layout of SBC8240 boards.
- *
- * See include/linux/mtd/partitions.h for definition of the
- * mtd_partition structure.
- *
- * The *_max_flash_size is the maximum possible mapped flash size
- * which is not necessarily the actual flash size. It must correspond
- * to the value specified in the mapping definition defined by the
- * "struct map_desc *_io_desc" for the corresponding machine.
- */
-
-#ifdef CONFIG_MTD_PARTITIONS
-
-static struct mtd_partition sbc8240_uboot_partitions [] = {
- /* Bank 0 */
- {
- .name = "U-boot", /* U-Boot Firmware */
- .offset = 0,
- .size = 0x00070000, /* 7 x 64 KiB sectors */
- .mask_flags = MTD_WRITEABLE, /* force read-only */
- },
- {
- .name = "environment", /* U-Boot environment */
- .offset = 0x00070000,
- .size = 0x00010000, /* 1 x 64 KiB sector */
- },
-};
-
-static struct mtd_partition sbc8240_fs_partitions [] = {
- {
- .name = "jffs", /* JFFS filesystem */
- .offset = 0,
- .size = 0x003C0000, /* 4 * 15 * 64KiB */
- },
- {
- .name = "tmp32",
- .offset = 0x003C0000,
- .size = 0x00020000, /* 4 * 32KiB */
- },
- {
- .name = "tmp8a",
- .offset = 0x003E0000,
- .size = 0x00008000, /* 4 * 8KiB */
- },
- {
- .name = "tmp8b",
- .offset = 0x003E8000,
- .size = 0x00008000, /* 4 * 8KiB */
- },
- {
- .name = "tmp16",
- .offset = 0x003F0000,
- .size = 0x00010000, /* 4 * 16KiB */
- }
-};
-
-/* trivial struct to describe partition information */
-struct mtd_part_def
-{
- int nums;
- unsigned char *type;
- struct mtd_partition* mtd_part;
-};
-
-static struct mtd_info *sbc8240_mtd[NUM_FLASH_BANKS];
-static struct mtd_part_def sbc8240_part_banks[NUM_FLASH_BANKS];
-
-
-#endif /* CONFIG_MTD_PARTITIONS */
-
-
-static int __init init_sbc8240_mtd (void)
-{
- static struct _cjs {
- u_long addr;
- u_long size;
- } pt[NUM_FLASH_BANKS] = {
- {
- .addr = WINDOW_ADDR0,
- .size = WINDOW_SIZE0
- },
- {
- .addr = WINDOW_ADDR1,
- .size = WINDOW_SIZE1
- },
- };
-
- int devicesfound = 0;
- int i,j;
-
- for (i = 0; i < NUM_FLASH_BANKS; i++) {
- printk (KERN_NOTICE MSG_PREFIX
- "Probing 0x%08lx at 0x%08lx\n", pt[i].size, pt[i].addr);
-
- sbc8240_map[i].map_priv_1 =
- (unsigned long) ioremap (pt[i].addr, pt[i].size);
- if (!sbc8240_map[i].map_priv_1) {
- printk (MSG_PREFIX "failed to ioremap\n");
- for (j = 0; j < i; j++) {
- iounmap((void *) sbc8240_map[j].map_priv_1);
- sbc8240_map[j].map_priv_1 = 0;
- }
- return -EIO;
- }
- simple_map_init(&sbc8240_mtd[i]);
-
- sbc8240_mtd[i] = do_map_probe("jedec_probe", &sbc8240_map[i]);
-
- if (sbc8240_mtd[i]) {
- sbc8240_mtd[i]->module = THIS_MODULE;
- devicesfound++;
- } else {
- if (sbc8240_map[i].map_priv_1) {
- iounmap((void *) sbc8240_map[i].map_priv_1);
- sbc8240_map[i].map_priv_1 = 0;
- }
- }
- }
-
- if (!devicesfound) {
- printk(KERN_NOTICE MSG_PREFIX
- "No suppported flash chips found!\n");
- return -ENXIO;
- }
-
-#ifdef CONFIG_MTD_PARTITIONS
- sbc8240_part_banks[0].mtd_part = sbc8240_uboot_partitions;
- sbc8240_part_banks[0].type = "static image";
- sbc8240_part_banks[0].nums = ARRAY_SIZE(sbc8240_uboot_partitions);
- sbc8240_part_banks[1].mtd_part = sbc8240_fs_partitions;
- sbc8240_part_banks[1].type = "static file system";
- sbc8240_part_banks[1].nums = ARRAY_SIZE(sbc8240_fs_partitions);
-
- for (i = 0; i < NUM_FLASH_BANKS; i++) {
-
- if (!sbc8240_mtd[i]) continue;
- if (sbc8240_part_banks[i].nums == 0) {
- printk (KERN_NOTICE MSG_PREFIX
- "No partition info available, registering whole device\n");
- add_mtd_device(sbc8240_mtd[i]);
- } else {
- printk (KERN_NOTICE MSG_PREFIX
- "Using %s partition definition\n", sbc8240_part_banks[i].mtd_part->name);
- add_mtd_partitions (sbc8240_mtd[i],
- sbc8240_part_banks[i].mtd_part,
- sbc8240_part_banks[i].nums);
- }
- }
-#else
- printk(KERN_NOTICE MSG_PREFIX
- "Registering %d flash banks at once\n", devicesfound);
-
- for (i = 0; i < devicesfound; i++) {
- add_mtd_device(sbc8240_mtd[i]);
- }
-#endif /* CONFIG_MTD_PARTITIONS */
-
- return devicesfound == 0 ? -ENXIO : 0;
-}
-
-static void __exit cleanup_sbc8240_mtd (void)
-{
- int i;
-
- for (i = 0; i < NUM_FLASH_BANKS; i++) {
- if (sbc8240_mtd[i]) {
- del_mtd_device (sbc8240_mtd[i]);
- map_destroy (sbc8240_mtd[i]);
- }
- if (sbc8240_map[i].map_priv_1) {
- iounmap ((void *) sbc8240_map[i].map_priv_1);
- sbc8240_map[i].map_priv_1 = 0;
- }
- }
-}
-
-module_init (init_sbc8240_mtd);
-module_exit (cleanup_sbc8240_mtd);
-
-MODULE_LICENSE ("GPL");
-MODULE_AUTHOR ("Carolyn Smith <carolyn.smith@tektronix.com>");
-MODULE_DESCRIPTION ("MTD map driver for SBC8240 boards");
-
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff