[MTD] maps: Add support for the "TQM834x" Boards

The following patch adds support for the TQ Systems  TQM834x  Boards.
Verified on TQM8349L.

This is a resubmit after integrating the suggested changes.

Signed-off-by: Marian Balakowicz <m8@semihalf.com>
Signed-off-by: Wolfgang Denk <wd@denx.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 291 insertions, 0 deletions

diff --git a/drivers/mtd/maps/tqm834x.c b/drivers/mtd/maps/tqm834x.c
new file mode 100644
index 000000000000..d0bc9593cb4d
--- /dev/null
+++ b/drivers/mtd/maps/tqm834x.c
@@ -0,0 +1,291 @@
+/*
+ * 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");