--- /dev/null
+/*
+ * drivers/mtd/maps/tqm834x.c
+ *
+ * MTD mapping driver for TQM834x boards
+ *
+ * Copyright 2005 Wolfgang Denk, DENX Software Engineering, <wd@denx.de>.
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <asm/io.h>
+#include <asm/ppcboot.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+
+#define FLASH_BANK_MAX 2
+
+extern unsigned char __res[];
+
+/* trivial struct to describe partition information */
+struct mtd_part_def
+{
+ int nums;
+ unsigned char *type;
+ struct mtd_partition* mtd_part;
+};
+
+static struct mtd_info* mtd_banks[FLASH_BANK_MAX];
+static struct map_info* map_banks[FLASH_BANK_MAX];
+static struct mtd_part_def part_banks[FLASH_BANK_MAX];
+
+static unsigned long num_banks;
+static unsigned long start_scan_addr;
+
+#ifdef CONFIG_MTD_PARTITIONS
+/*
+ * The following defines the partition layout of TQM834x boards.
+ *
+ * See include/linux/mtd/partitions.h for definition of the
+ * mtd_partition structure.
+ *
+ * Assume minimal initial size of 4 MiB per bank, will be updated
+ * later in init_tqm834x_mtd() routine.
+ */
+
+/* Partition definition for the first flash bank which is always present. */
+static struct mtd_partition tqm834x_partitions_bank1[] = {
+ {
+ .name = "u-boot", /* u-boot firmware */
+ .offset = 0x00000000,
+ .size = 0x00040000, /* 256 KiB */
+ /*mask_flags: MTD_WRITEABLE, * force read-only */
+ },
+ {
+ .name = "env", /* u-boot environment */
+ .offset = 0x00040000,
+ .size = 0x00020000, /* 128 KiB */
+ /*mask_flags: MTD_WRITEABLE, * force read-only */
+ },
+ {
+ .name = "kernel", /* linux kernel image */
+ .offset = 0x00060000,
+ .size = 0x00100000, /* 1 MiB */
+ /*mask_flags: MTD_WRITEABLE, * force read-only */
+ },
+ {
+ .name = "initrd", /* ramdisk image */
+ .offset = 0x00160000,
+ .size = 0x00200000, /* 2 MiB */
+ },
+ {
+ .name = "user", /* user data */
+ .offset = 0x00360000,
+ .size = 0x000a0000, /* remaining space */
+ /* NOTE: this parttion size is re-calcated in */
+ /* init_tqm834x_mtd() to cover actual remaining space. */
+ },
+};
+
+/* Partition definition for the second flash bank which may be present on some
+ * TQM834x boards.
+ */
+static struct mtd_partition tqm834x_partitions_bank2[] = {
+ {
+ .name = "jffs2", /* jffs2 filesystem */
+ .offset = 0x00000000,
+ .size = 0x00400000, /* whole device */
+ /* NOTE: this parttion size is re-calcated in */
+ /* init_tqm834x_mtd() to cover actual device size. */
+ },
+};
+
+#endif /* CONFIG_MTD_PARTITIONS */
+
+static int __init init_tqm834x_mtd(void)
+{
+ int idx = 0, ret = 0;
+ unsigned long flash_addr, flash_size, mtd_size = 0;
+
+ /* pointer to TQM834x board info data */
+ bd_t *bd = (bd_t *)__res;
+#ifdef CONFIG_MTD_CMDLINE_PARTS
+ int n;
+ char mtdid[4];
+ const char *part_probes[] = { "cmdlinepart", NULL };
+#endif
+
+ flash_addr = bd->bi_flashstart;
+ flash_size = bd->bi_flashsize;
+
+ /* request maximum flash size address space */
+ start_scan_addr = (unsigned long)ioremap(flash_addr, flash_size);
+ if (!start_scan_addr) {
+ printk("%s: Failed to ioremap address: 0x%lx\n",
+ __FUNCTION__, flash_addr);
+ return -EIO;
+ }
+
+ for(idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
+ if (mtd_size >= flash_size)
+ break;
+
+ pr_debug("%s: chip probing count %d\n", __FUNCTION__, idx);
+
+ map_banks[idx] =
+ (struct map_info *)kmalloc(sizeof(struct map_info),
+ GFP_KERNEL);
+ if (map_banks[idx] == NULL) {
+ ret = -ENOMEM;
+ goto error_mem;
+ }
+ memset((void *)map_banks[idx], 0, sizeof(struct map_info));
+ map_banks[idx]->name = (char *)kmalloc(16, GFP_KERNEL);
+ if (map_banks[idx]->name == NULL) {
+ ret = -ENOMEM;
+ goto error_mem;
+ }
+ memset((void *)map_banks[idx]->name, 0, 16);
+
+ sprintf(map_banks[idx]->name, "TQM834x-%d", idx);
+ map_banks[idx]->size = flash_size;
+ map_banks[idx]->bankwidth = 4;
+
+ simple_map_init(map_banks[idx]);
+
+ map_banks[idx]->virt = (void __iomem *)
+ (start_scan_addr + ((idx > 0) ?
+ (mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0));
+ map_banks[idx]->phys =
+ flash_addr + ((idx > 0) ?
+ (mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0);
+
+ /* start to probe flash chips */
+ mtd_banks[idx] = do_map_probe("cfi_probe", map_banks[idx]);
+ if (mtd_banks[idx]) {
+ mtd_banks[idx]->owner = THIS_MODULE;
+ mtd_size += mtd_banks[idx]->size;
+ num_banks++;
+ pr_debug("%s: bank %ld, name: %s, size: %d bytes \n",
+ __FUNCTION__, num_banks,
+ mtd_banks[idx]->name, mtd_banks[idx]->size);
+ }
+ }
+
+ /* no supported flash chips found */
+ if (!num_banks) {
+ printk("TQM834x: No supported flash chips found!\n");
+ ret = -ENXIO;
+ goto error_mem;
+ }
+
+#ifdef CONFIG_MTD_PARTITIONS
+ /*
+ * Select static partition definitions
+ */
+ n = ARRAY_SIZE(tqm834x_partitions_bank1);
+ part_banks[0].mtd_part = tqm834x_partitions_bank1;
+ part_banks[0].type = "static image bank1";
+ part_banks[0].nums = n;
+
+ /* update last partition size to cover actual remaining space */
+ tqm834x_partitions_bank1[n - 1].size =
+ mtd_banks[0]->size -
+ tqm834x_partitions_bank1[n - 1].offset;
+
+ /* check if we have second bank? */
+ if (num_banks == 2) {
+ n = ARRAY_SIZE(tqm834x_partitions_bank2);
+ part_banks[1].mtd_part = tqm834x_partitions_bank2;
+ part_banks[1].type = "static image bank2";
+ part_banks[1].nums = n;
+
+ /* update last partition size to cover actual remaining space */
+ tqm834x_partitions_bank2[n - 1].size =
+ mtd_banks[1]->size -
+ tqm834x_partitions_bank2[n - 1].offset;
+ }
+
+ for(idx = 0; idx < num_banks ; idx++) {
+#ifdef CONFIG_MTD_CMDLINE_PARTS
+ sprintf(mtdid, "%d", idx);
+ n = parse_mtd_partitions(mtd_banks[idx],
+ part_probes,
+ &part_banks[idx].mtd_part,
+ 0);
+ pr_debug("%s: %d command line partitions on bank %s\n",
+ __FUNCTION__, n, mtdid);
+ if (n > 0) {
+ part_banks[idx].type = "command line";
+ part_banks[idx].nums = n;
+ }
+#endif /* CONFIG_MTD_CMDLINE_PARTS */
+ if (part_banks[idx].nums == 0) {
+ printk(KERN_NOTICE
+ "TQM834x flash bank %d: no partition info "
+ "available, registering whole device\n", idx);
+ add_mtd_device(mtd_banks[idx]);
+ } else {
+ printk(KERN_NOTICE
+ "TQM834x flash bank %d: Using %s partition "
+ "definition\n", idx, part_banks[idx].type);
+ add_mtd_partitions(mtd_banks[idx],
+ part_banks[idx].mtd_part,
+ part_banks[idx].nums);
+ }
+ }
+#else /* ! CONFIG_MTD_PARTITIONS */
+ printk(KERN_NOTICE "TQM834x flash: registering %d flash banks "
+ "at once\n", num_banks);
+
+ for(idx = 0 ; idx < num_banks ; idx++)
+ add_mtd_device(mtd_banks[idx]);
+
+#endif /* CONFIG_MTD_PARTITIONS */
+
+ return 0;
+error_mem:
+ for (idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
+ if (map_banks[idx] != NULL) {
+ if (map_banks[idx]->name != NULL) {
+ kfree(map_banks[idx]->name);
+ map_banks[idx]->name = NULL;
+ }
+ kfree(map_banks[idx]);
+ map_banks[idx] = NULL;
+ }
+ }
+
+ iounmap((void *)start_scan_addr);
+
+ return ret;
+}
+
+static void __exit cleanup_tqm834x_mtd(void)
+{
+ unsigned int idx = 0;
+ for(idx = 0 ; idx < num_banks ; idx++) {
+ /* destroy mtd_info previously allocated */
+ if (mtd_banks[idx]) {
+ del_mtd_partitions(mtd_banks[idx]);
+ map_destroy(mtd_banks[idx]);
+ }
+
+ /* release map_info not used anymore */
+ kfree(map_banks[idx]->name);
+ kfree(map_banks[idx]);
+ }
+
+ if (start_scan_addr) {
+ iounmap((void *)start_scan_addr);
+ start_scan_addr = 0;
+ }
+}
+
+module_init(init_tqm834x_mtd);
+module_exit(cleanup_tqm834x_mtd);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Wolfgang Denk <wd@denx.de>");
+MODULE_DESCRIPTION("MTD map driver for TQM834x boards");
projects / linux-beck.git / commitdiff