Blackfin arch: use the generic platform nand driver to support nand flash on bf53x board which do not have on-chip nand flash controller

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 86 insertions, 0 deletions

diff --git a/arch/blackfin/mach-bf537/boards/stamp.c b/arch/blackfin/mach-bf537/boards/stamp.c
index 671f9d67f23a..7e4b9d95674b 100644
--- a/arch/blackfin/mach-bf537/boards/stamp.c
+++ b/arch/blackfin/mach-bf537/boards/stamp.c
@@ -29,9 +29,12 @@
  */
 
 #include <linux/device.h>
+#include <linux/kernel.h>
 #include <linux/platform_device.h>
 #include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
 #include <linux/mtd/partitions.h>
+#include <linux/mtd/plat-ram.h>
 #include <linux/mtd/physmap.h>
 #include <linux/spi/spi.h>
 #include <linux/spi/flash.h>
@@ -355,6 +358,84 @@ static struct platform_device net2272_bfin_device = {
 };
 #endif
 
+#if defined(CONFIG_MTD_NAND_PLATFORM) || defined(CONFIG_MTD_NAND_PLATFORM_MODULE)
+#ifdef CONFIG_MTD_PARTITIONS
+const char *part_probes[] = { "cmdlinepart", "RedBoot", NULL };
+
+static struct mtd_partition bfin_plat_nand_partitions[] = {
+        {
+                .name   = "linux kernel",
+                .size   = 0x400000,
+                .offset = 0,
+        }, {
+                .name   = "file system",
+                .size   = MTDPART_SIZ_FULL,
+                .offset = MTDPART_OFS_APPEND,
+        },
+};
+#endif
+
+#define BFIN_NAND_PLAT_CLE 2
+#define BFIN_NAND_PLAT_ALE 1
+static void bfin_plat_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+{
+        struct nand_chip *this = mtd->priv;
+
+        if (cmd == NAND_CMD_NONE)
+                return;
+
+        if (ctrl & NAND_CLE)
+                writeb(cmd, this->IO_ADDR_W + (1 << BFIN_NAND_PLAT_CLE));
+        else
+                writeb(cmd, this->IO_ADDR_W + (1 << BFIN_NAND_PLAT_ALE));
+}
+
+#define BFIN_NAND_PLAT_READY GPIO_PF3
+static int bfin_plat_nand_dev_ready(struct mtd_info *mtd)
+{
+        return gpio_get_value(BFIN_NAND_PLAT_READY);
+}
+
+static struct platform_nand_data bfin_plat_nand_data = {
+        .chip = {
+                .chip_delay = 30,
+#ifdef CONFIG_MTD_PARTITIONS
+                .part_probe_types = part_probes,
+                .partitions = bfin_plat_nand_partitions,
+                .nr_partitions = ARRAY_SIZE(bfin_plat_nand_partitions),
+#endif
+        },
+        .ctrl = {
+                .cmd_ctrl  = bfin_plat_nand_cmd_ctrl,
+                .dev_ready = bfin_plat_nand_dev_ready,
+        },
+};
+
+#define MAX(x, y) (x > y ? x : y)
+static struct resource bfin_plat_nand_resources = {
+        .start = 0x20212000,
+        .end   = 0x20212000 + (1 << MAX(BFIN_NAND_PLAT_CLE, BFIN_NAND_PLAT_ALE)),
+        .flags = IORESOURCE_IO,
+};
+
+static struct platform_device bfin_async_nand_device = {
+        .name = "gen_nand",
+        .id = -1,
+        .num_resources = 1,
+        .resource = &bfin_plat_nand_resources,
+        .dev = {
+                .platform_data = &bfin_plat_nand_data,
+        },
+};
+
+static void bfin_plat_nand_init(void)
+{
+        gpio_request(BFIN_NAND_PLAT_READY, "bfin_nand_plat");
+}
+#else
+static void bfin_plat_nand_init(void) {}
+#endif
+
 #if defined(CONFIG_MTD_PHYSMAP) || defined(CONFIG_MTD_PHYSMAP_MODULE)
 static struct mtd_partition stamp_partitions[] = {
         {
@@ -922,6 +1003,10 @@ static struct platform_device *stamp_devices[] __initdata = {
 
         &bfin_gpios_device,
 
+#if defined(CONFIG_MTD_NAND_PLATFORM) || defined(CONFIG_MTD_NAND_PLATFORM_MODULE)
+        &bfin_async_nand_device,
+#endif
+
 #if defined(CONFIG_MTD_PHYSMAP) || defined(CONFIG_MTD_PHYSMAP_MODULE)
         &stamp_flash_device,
 #endif
@@ -936,6 +1021,7 @@ static int __init stamp_init(void)
                                 ARRAY_SIZE(bfin_i2c_board_info));
 #endif
 
+        bfin_plat_nand_init();
         platform_add_devices(stamp_devices, ARRAY_SIZE(stamp_devices));
         spi_register_board_info(bfin_spi_board_info, ARRAY_SIZE(bfin_spi_board_info));