patch-2.4.19 linux-2.4.19/drivers/mtd/maps/tsunami_flash.c
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- Lines: 111
- Date:
Fri Aug 2 17:39:44 2002
- Orig file:
linux-2.4.18/drivers/mtd/maps/tsunami_flash.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -urN linux-2.4.18/drivers/mtd/maps/tsunami_flash.c linux-2.4.19/drivers/mtd/maps/tsunami_flash.c
@@ -0,0 +1,110 @@
+/*
+ * tsunami_flash.c
+ *
+ * flash chip on alpha ds10...
+ * $Id: tsunami_flash.c,v 1.1 2002/01/10 22:59:13 eric Exp $
+ */
+#include <asm/io.h>
+#include <asm/core_tsunami.h>
+#include <linux/mtd/map.h>
+
+#define FLASH_ENABLE_PORT 0x00C00001
+#define FLASH_ENABLE_BYTE 0x01
+#define FLASH_DISABLE_BYTE 0x00
+
+#define MAX_TIG_FLASH_SIZE (12*1024*1024)
+static inline __u8 tsunami_flash_read8(struct map_info *map, unsigned long offset)
+{
+ return tsunami_tig_readb(offset);
+}
+
+static void tsunami_flash_write8(struct map_info *map, __u8 value, unsigned long offset)
+{
+ tsunami_tig_writeb(value, offset);
+}
+
+static void tsunami_flash_copy_from(
+ struct map_info *map, void *addr, unsigned long offset, ssize_t len)
+{
+ unsigned char *dest;
+ dest = addr;
+ while(len && (offset < MAX_TIG_FLASH_SIZE)) {
+ *dest = tsunami_tig_readb(offset);
+ offset++;
+ dest++;
+ len--;
+ }
+}
+
+static void tsunami_flash_copy_to(
+ struct map_info *map, unsigned long offset,
+ const void *addr, ssize_t len)
+{
+ const unsigned char *src;
+ src = addr;
+ while(len && (offset < MAX_TIG_FLASH_SIZE)) {
+ tsunami_tig_writeb(*src, offset);
+ offset++;
+ src++;
+ len--;
+ }
+}
+
+/*
+ * Deliberately don't provide operations wider than 8 bits. I don't
+ * have then and it scares me to think how you could mess up if
+ * you tried to use them. Buswidth is correctly so I'm safe.
+ */
+static struct map_info tsunami_flash_map = {
+ .name = "flash chip on the Tsunami TIG bus",
+ .size = MAX_TIG_FLASH_SIZE,
+ .buswidth = 1,
+ .read8 = tsunami_flash_read8,
+ .read16 = 0,
+ .read32 = 0,
+ .copy_from = tsunami_flash_copy_from,
+ .write8 = tsunami_flash_write8,
+ .write16 = 0,
+ .write32 = 0,
+ .copy_to = tsunami_flash_copy_to,
+ .set_vpp = 0,
+ .map_priv_1 = 0,
+
+};
+
+static struct mtd_info *tsunami_flash_mtd;
+
+static void __exit cleanup_tsunami_flash(void)
+{
+ struct mtd_info *mtd;
+ mtd = tsunami_flash_mtd;
+ if (mtd) {
+ del_mtd_device(mtd);
+ map_destroy(mtd);
+ }
+ tsunami_flash_mtd = 0;
+}
+
+
+static int __init init_tsunami_flash(void)
+{
+ static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", 0 };
+ char **type;
+
+ tsunami_tig_writeb(FLASH_ENABLE_BYTE, FLASH_ENABLE_PORT);
+
+ tsunami_flash_mtd = 0;
+ type = rom_probe_types;
+ for(; !tsunami_flash_mtd && *type; type++) {
+ tsunami_flash_mtd = do_map_probe(*type, &tsunami_flash_map);
+ }
+ if (tsunami_flash_mtd) {
+ tsunami_flash_mtd->module = THIS_MODULE;
+ add_mtd_device(tsunami_flash_mtd);
+ return 0;
+ }
+ return -ENXIO;
+}
+
+module_init(init_tsunami_flash);
+module_exit(cleanup_tsunami_flash);
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