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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/mtd/maps/tqm8xxl.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/mtd/maps/tqm8xxl.c')
-rw-r--r--drivers/mtd/maps/tqm8xxl.c263
1 files changed, 263 insertions, 0 deletions
diff --git a/drivers/mtd/maps/tqm8xxl.c b/drivers/mtd/maps/tqm8xxl.c
new file mode 100644
index 00000000000..995e9991cb8
--- /dev/null
+++ b/drivers/mtd/maps/tqm8xxl.c
@@ -0,0 +1,263 @@
+/*
+ * Handle mapping of the flash memory access routines
+ * on TQM8xxL based devices.
+ *
+ * $Id: tqm8xxl.c,v 1.13 2004/10/20 22:21:53 dwmw2 Exp $
+ *
+ * based on rpxlite.c
+ *
+ * Copyright(C) 2001 Kirk Lee <kirk@hpc.ee.ntu.edu.tw>
+ *
+ * This code is GPLed
+ *
+ */
+
+/*
+ * According to TQM8xxL hardware manual, TQM8xxL series have
+ * following flash memory organisations:
+ * | capacity | | chip type | | bank0 | | bank1 |
+ * 2MiB 512Kx16 2MiB 0
+ * 4MiB 1Mx16 4MiB 0
+ * 8MiB 1Mx16 4MiB 4MiB
+ * Thus, we choose CONFIG_MTD_CFI_I2 & CONFIG_MTD_CFI_B4 at
+ * kernel configuration.
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <asm/io.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+
+#define FLASH_ADDR 0x40000000
+#define FLASH_SIZE 0x00800000
+#define FLASH_BANK_MAX 4
+
+// trivial struct to describe partition information
+struct mtd_part_def
+{
+ int nums;
+ unsigned char *type;
+ struct mtd_partition* mtd_part;
+};
+
+//static struct mtd_info *mymtd;
+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 void __iomem *start_scan_addr;
+
+/*
+ * Here are partition information for all known TQM8xxL series devices.
+ * 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
+/* Currently, TQM8xxL has upto 8MiB flash */
+static unsigned long tqm8xxl_max_flash_size = 0x00800000;
+
+/* partition definition for first flash bank
+ * (cf. "drivers/char/flash_config.c")
+ */
+static struct mtd_partition tqm8xxl_partitions[] = {
+ {
+ .name = "ppcboot",
+ .offset = 0x00000000,
+ .size = 0x00020000, /* 128KB */
+ .mask_flags = MTD_WRITEABLE, /* force read-only */
+ },
+ {
+ .name = "kernel", /* default kernel image */
+ .offset = 0x00020000,
+ .size = 0x000e0000,
+ .mask_flags = MTD_WRITEABLE, /* force read-only */
+ },
+ {
+ .name = "user",
+ .offset = 0x00100000,
+ .size = 0x00100000,
+ },
+ {
+ .name = "initrd",
+ .offset = 0x00200000,
+ .size = 0x00200000,
+ }
+};
+/* partition definition for second flash bank */
+static struct mtd_partition tqm8xxl_fs_partitions[] = {
+ {
+ .name = "cramfs",
+ .offset = 0x00000000,
+ .size = 0x00200000,
+ },
+ {
+ .name = "jffs",
+ .offset = 0x00200000,
+ .size = 0x00200000,
+ //.size = MTDPART_SIZ_FULL,
+ }
+};
+#endif
+
+int __init init_tqm_mtd(void)
+{
+ int idx = 0, ret = 0;
+ unsigned long flash_addr, flash_size, mtd_size = 0;
+ /* pointer to TQM8xxL board info data */
+ bd_t *bd = (bd_t *)__res;
+
+ flash_addr = bd->bi_flashstart;
+ flash_size = bd->bi_flashsize;
+
+ //request maximum flash size address space
+ start_scan_addr = ioremap(flash_addr, flash_size);
+ if (!start_scan_addr) {
+ printk(KERN_WARNING "%s:Failed to ioremap address:0x%x\n", __FUNCTION__, flash_addr);
+ return -EIO;
+ }
+
+ for (idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
+ if(mtd_size >= flash_size)
+ break;
+
+ printk(KERN_INFO "%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;
+ /* FIXME: What if some MTD devices were probed already? */
+ 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) {
+ ret = -ENOMEM;
+ /* FIXME: What if some MTD devices were probed already? */
+ goto error_mem;
+ }
+ sprintf(map_banks[idx]->name, "TQM8xxL%d", idx);
+
+ map_banks[idx]->size = flash_size;
+ map_banks[idx]->bankwidth = 4;
+
+ simple_map_init(map_banks[idx]);
+
+ map_banks[idx]->virt = start_scan_addr;
+ map_banks[idx]->phys = flash_addr;
+ /* FIXME: This looks utterly bogus, but I'm trying to
+ preserve the behaviour of the original (shown here)...
+
+ map_banks[idx]->map_priv_1 =
+ start_scan_addr + ((idx > 0) ?
+ (mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0);
+ */
+
+ if (idx && mtd_banks[idx-1]) {
+ map_banks[idx]->virt += mtd_banks[idx-1]->size;
+ map_banks[idx]->phys += mtd_banks[idx-1]->size;
+ }
+
+ //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++;
+
+ printk(KERN_INFO "%s: bank%d, name:%s, size:%dbytes \n", __FUNCTION__, num_banks,
+ mtd_banks[idx]->name, mtd_banks[idx]->size);
+ }
+ }
+
+ /* no supported flash chips found */
+ if (!num_banks) {
+ printk(KERN_NOTICE "TQM8xxL: No support flash chips found!\n");
+ ret = -ENXIO;
+ goto error_mem;
+ }
+
+#ifdef CONFIG_MTD_PARTITIONS
+ /*
+ * Select Static partition definitions
+ */
+ part_banks[0].mtd_part = tqm8xxl_partitions;
+ part_banks[0].type = "Static image";
+ part_banks[0].nums = ARRAY_SIZE(tqm8xxl_partitions);
+
+ part_banks[1].mtd_part = tqm8xxl_fs_partitions;
+ part_banks[1].type = "Static file system";
+ part_banks[1].nums = ARRAY_SIZE(tqm8xxl_fs_partitions);
+
+ for(idx = 0; idx < num_banks ; idx++) {
+ if (part_banks[idx].nums == 0) {
+ printk(KERN_NOTICE "TQM flash%d: no partition info available, registering whole flash at once\n", idx);
+ add_mtd_device(mtd_banks[idx]);
+ } else {
+ printk(KERN_NOTICE "TQM flash%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
+ printk(KERN_NOTICE "TQM flash: registering %d whole flash banks at once\n", num_banks);
+ for(idx = 0 ; idx < num_banks ; idx++)
+ add_mtd_device(mtd_banks[idx]);
+#endif
+ 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;
+ }
+ }
+error:
+ iounmap(start_scan_addr);
+ return ret;
+}
+
+static void __exit cleanup_tqm_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(start_scan_addr);
+ start_scan_addr = 0;
+ }
+}
+
+module_init(init_tqm_mtd);
+module_exit(cleanup_tqm_mtd);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Kirk Lee <kirk@hpc.ee.ntu.edu.tw>");
+MODULE_DESCRIPTION("MTD map driver for TQM8xxL boards");