patch-2.4.6 linux/drivers/mtd/maps/dc21285.c
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- Lines: 194
- Date:
Tue Jun 12 10:30:27 2001
- Orig file:
v2.4.5/linux/drivers/mtd/maps/dc21285.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.5/linux/drivers/mtd/maps/dc21285.c linux/drivers/mtd/maps/dc21285.c
@@ -0,0 +1,193 @@
+/*
+ * MTD map driver for flash on the DC21285 (the StrongARM-110 companion chip)
+ *
+ * (C) 2000 Nicolas Pitre <nico@cam.org>
+ *
+ * This code is GPL
+ *
+ * $Id: dc21285.c,v 1.4 2001/04/26 15:40:23 dwmw2 Exp $
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/io.h>
+#include <asm/hardware/dec21285.h>
+
+
+static struct mtd_info *mymtd;
+
+__u8 dc21285_read8(struct map_info *map, unsigned long ofs)
+{
+ return *(__u8*)(map->map_priv_1 + ofs);
+}
+
+__u16 dc21285_read16(struct map_info *map, unsigned long ofs)
+{
+ return *(__u16*)(map->map_priv_1 + ofs);
+}
+
+__u32 dc21285_read32(struct map_info *map, unsigned long ofs)
+{
+ return *(__u32*)(map->map_priv_1 + ofs);
+}
+
+void dc21285_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
+{
+ memcpy(to, (void*)(map->map_priv_1 + from), len);
+}
+
+void dc21285_write8(struct map_info *map, __u8 d, unsigned long adr)
+{
+ *CSR_ROMWRITEREG = adr;
+ adr &= ~3;
+ *(__u8*)(map->map_priv_1 + adr) = d;
+}
+
+void dc21285_write16(struct map_info *map, __u16 d, unsigned long adr)
+{
+ *CSR_ROMWRITEREG = adr;
+ adr &= ~1;
+ *(__u16*)(map->map_priv_1 + adr) = d;
+}
+
+void dc21285_write32(struct map_info *map, __u32 d, unsigned long adr)
+{
+ *(__u32*)(map->map_priv_1 + adr) = d;
+}
+
+void dc21285_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
+{
+ switch (map->buswidth) {
+ case 4:
+ while (len > 0) {
+ __u32 d = *((__u32*)from)++;
+ dc21285_write32(map, d, to);
+ to += 4;
+ len -= 4;
+ }
+ break;
+ case 2:
+ while (len > 0) {
+ __u16 d = *((__u16*)from)++;
+ dc21285_write16(map, d, to);
+ to += 2;
+ len -= 2;
+ }
+ break;
+ case 1:
+ while (len > 0) {
+ __u8 d = *((__u8*)from)++;
+ dc21285_write8(map, d, to);
+ to++;
+ len--;
+ }
+ break;
+ }
+}
+
+struct map_info dc21285_map = {
+ name: "DC21285 flash",
+ size: 16*1024*1024,
+ read8: dc21285_read8,
+ read16: dc21285_read16,
+ read32: dc21285_read32,
+ copy_from: dc21285_copy_from,
+ write8: dc21285_write8,
+ write16: dc21285_write16,
+ write32: dc21285_write32,
+ copy_to: dc21285_copy_to
+};
+
+
+/* Partition stuff */
+static struct mtd_partition *dc21285_parts;
+
+extern int parse_redboot_partitions(struct mtd_info *, struct mtd_partition **);
+
+int __init init_dc21285(void)
+{
+ /* Determine buswidth */
+ switch (*CSR_SA110_CNTL & (3<<14)) {
+ case SA110_CNTL_ROMWIDTH_8:
+ dc21285_map.buswidth = 1;
+ break;
+ case SA110_CNTL_ROMWIDTH_16:
+ dc21285_map.buswidth = 2;
+ break;
+ case SA110_CNTL_ROMWIDTH_32:
+ dc21285_map.buswidth = 4;
+ break;
+ default:
+ printk (KERN_ERR "DC21285 flash: undefined buswidth\n");
+ return -ENXIO;
+ }
+ printk (KERN_NOTICE "DC21285 flash support (%d-bit buswidth)\n",
+ dc21285_map.buswidth*8);
+
+ /* Let's map the flash area */
+ dc21285_map.map_priv_1 = (unsigned long)__ioremap(DC21285_FLASH, 16*1024*1024, 0);
+ if (!dc21285_map.map_priv_1) {
+ printk("Failed to ioremap\n");
+ return -EIO;
+ }
+
+ mymtd = do_map_probe("cfi", &dc21285_map);
+ if (mymtd) {
+ int nrparts;
+
+ mymtd->module = THIS_MODULE;
+
+ /* partition fixup */
+
+ nrparts = parse_redboot_partitions(mymtd, &dc21285_parts);
+ if (nrparts <=0) {
+ printk(KERN_NOTICE "RedBoot partition table failed\n");
+ iounmap((void *)dc21285_map.map_priv_1);
+ return -ENXIO;
+ }
+
+ add_mtd_partitions(mymtd, dc21285_parts, nrparts);
+
+ /*
+ * Flash timing is determined with bits 19-16 of the
+ * CSR_SA110_CNTL. The value is the number of wait cycles, or
+ * 0 for 16 cycles (the default). Cycles are 20 ns.
+ * Here we use 7 for 140 ns flash chips.
+ */
+ /* access time */
+ *CSR_SA110_CNTL = ((*CSR_SA110_CNTL & ~0x000f0000) | (7 << 16));
+ /* burst time */
+ *CSR_SA110_CNTL = ((*CSR_SA110_CNTL & ~0x00f00000) | (7 << 20));
+ /* tristate time */
+ *CSR_SA110_CNTL = ((*CSR_SA110_CNTL & ~0x0f000000) | (7 << 24));
+
+ return 0;
+ }
+
+ iounmap((void *)dc21285_map.map_priv_1);
+ return -ENXIO;
+}
+
+static void __exit cleanup_dc21285(void)
+{
+ if (mymtd) {
+ del_mtd_device(mymtd);
+ map_destroy(mymtd);
+ mymtd = NULL;
+ }
+ if (dc21285_map.map_priv_1) {
+ iounmap((void *)dc21285_map.map_priv_1);
+ dc21285_map.map_priv_1 = 0;
+ }
+ if(dc21285_parts)
+ kfree(dc21285_parts);
+}
+
+module_init(init_dc21285);
+module_exit(cleanup_dc21285);
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