mtd: nand: new base driver for memory mapped nand devices
The BF537-STAMP Blackfin board had a driver for working with NAND devices
that are simply memory mapped. Since there is nothing Blackfin specific
about this, generalize the driver a bit so that everyone can leverage it.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Scott Wood <scottwood@freescale.com>
diff --git a/include/configs/bf537-stamp.h b/include/configs/bf537-stamp.h
index 0a86e83..98300db 100644
--- a/include/configs/bf537-stamp.h
+++ b/include/configs/bf537-stamp.h
@@ -151,36 +151,28 @@
/*
* NAND Settings
*/
-/* #define CONFIG_BF537_NAND */
-#ifdef CONFIG_BF537_NAND
-# define CONFIG_CMD_NAND
-#endif
-
-#define CONFIG_SYS_NAND_ADDR 0x20212000
-#define CONFIG_SYS_NAND_BASE CONFIG_SYS_NAND_ADDR
+/* #define CONFIG_NAND_PLAT */
+#define CONFIG_SYS_NAND_BASE 0x20212000
#define CONFIG_SYS_MAX_NAND_DEVICE 1
-#define SECTORSIZE 512
-#define ADDR_COLUMN 1
-#define ADDR_PAGE 2
-#define ADDR_COLUMN_PAGE 3
-#define NAND_ChipID_UNKNOWN 0x00
-#define NAND_MAX_FLOORS 1
-#define BFIN_NAND_READY PF3
-#define NAND_WAIT_READY(nand) \
+#define BFIN_NAND_CLE(chip) ((unsigned long)(chip)->IO_ADDR_W | (1 << 2))
+#define BFIN_NAND_ALE(chip) ((unsigned long)(chip)->IO_ADDR_W | (1 << 1))
+#define BFIN_NAND_READY PF3
+#define BFIN_NAND_WRITE(addr, cmd) \
do { \
- int timeout = 0; \
- while (!(*pPORTFIO & PF3)) \
- if (timeout++ > 100000) \
- break; \
+ bfin_write8(addr, cmd); \
+ SSYNC(); \
} while (0)
-#define BFIN_NAND_CLE (1 << 2) /* A2 -> Command Enable */
-#define BFIN_NAND_ALE (1 << 1) /* A1 -> Address Enable */
-#define WRITE_NAND_COMMAND(d, adr) bfin_write8(adr | BFIN_NAND_CLE, d)
-#define WRITE_NAND_ADDRESS(d, adr) bfin_write8(adr | BFIN_NAND_ALE, d)
-#define WRITE_NAND(d, adr) bfin_write8(adr, d)
-#define READ_NAND(adr) bfin_read8(adr)
+#define NAND_PLAT_WRITE_CMD(chip, cmd) BFIN_NAND_WRITE(BFIN_NAND_CLE(chip), cmd)
+#define NAND_PLAT_WRITE_ADR(chip, cmd) BFIN_NAND_WRITE(BFIN_NAND_ALE(chip), cmd)
+#define NAND_PLAT_DEV_READY(chip) (bfin_read_PORTFIO() & BFIN_NAND_READY)
+#define NAND_PLAT_INIT() \
+ do { \
+ bfin_write_PORTF_FER(bfin_read_PORTF_FER() & ~BFIN_NAND_READY); \
+ bfin_write_PORTFIO_DIR(bfin_read_PORTFIO_DIR() & ~BFIN_NAND_READY); \
+ bfin_write_PORTFIO_INEN(bfin_read_PORTFIO_INEN() | BFIN_NAND_READY); \
+ } while (0)
/*