--- /dev/null
+/*
+ * Handle mapping of the flash memory access routines on the SBC8240 board.
+ *
+ * Carolyn Smith, Tektronix, Inc.
+ *
+ * This code is GPLed
+ *
+ * $Id: sbc8240.c,v 1.4 2004/07/12 22:38:29 dwmw2 Exp $
+ *
+ */
+
+/*
+ * 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/config.h>
+#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 (sizeof(sbc8240_map) / sizeof(struct map_info))
+
+/*
+ * 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 */
+ }
+};
+
+#define NB_OF(x) (sizeof (x) / sizeof (x[0]))
+
+/* 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 */
+
+
+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;
+
+ 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");
+ 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++;
+ }
+ }
+
+ 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 = NB_OF(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 = NB_OF(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");
+
git://git.onelab.eu / linux-2.6.git / blobdiff