[ARM] 4385/2: ixdp425: NAND support

IXDP425 NAND support (arch specific part).

The generic platform driver that is used by ixdp425 platfrom is already
in upstream kernel in 2.6.22-rc1.

Signed-off-by: Vladimir Barinov <vbarinov@ru.mvista.com>
Signed-off-by: Ruslan Sushko <rsushko@ru.mvista.com>
Signed-off-by: Deepak Saxena <dsaxena@mvista.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 100 insertions, 0 deletions

diff --git a/arch/arm/mach-ixp4xx/ixdp425-setup.c b/arch/arm/mach-ixp4xx/ixdp425-setup.c
index ec4f07950ec6..d5008d8fc9a5 100644
--- a/arch/arm/mach-ixp4xx/ixdp425-setup.c
+++ b/arch/arm/mach-ixp4xx/ixdp425-setup.c
@@ -15,6 +15,10 @@
 #include <linux/tty.h>
 #include <linux/serial_8250.h>
 #include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
 
 #include <asm/types.h>
 #include <asm/setup.h>
@@ -24,6 +28,7 @@
 #include <asm/irq.h>
 #include <asm/mach/arch.h>
 #include <asm/mach/flash.h>
+#include <asm/delay.h>
 
 static struct flash_platform_data ixdp425_flash_data = {
         .map_name       = "cfi_probe",
@@ -44,6 +49,77 @@ static struct platform_device ixdp425_flash = {
         .resource       = &ixdp425_flash_resource,
 };
 
+#if defined(CONFIG_MTD_NAND_PLATFORM) || \
+    defined(CONFIG_MTD_NAND_PLATFORM_MODULE)
+
+#ifdef CONFIG_MTD_PARTITIONS
+const char *part_probes[] = { "cmdlinepart", NULL };
+
+static struct mtd_partition ixdp425_partitions[] = {
+        {
+                .name   = "ixp400 NAND FS 0",
+                .offset = 0,
+                .size   = SZ_8M
+        }, {
+                .name   = "ixp400 NAND FS 1",
+                .offset = MTDPART_OFS_APPEND,
+                .size   = MTDPART_SIZ_FULL
+        },
+};
+#endif
+
+static void
+ixdp425_flash_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+{
+        struct nand_chip *this = mtd->priv;
+        int offset = (int)this->priv;
+
+        if (ctrl & NAND_CTRL_CHANGE) {
+                if (ctrl & NAND_NCE) {
+                        gpio_line_set(IXDP425_NAND_NCE_PIN, IXP4XX_GPIO_LOW);
+                        udelay(5);
+                } else
+                        gpio_line_set(IXDP425_NAND_NCE_PIN, IXP4XX_GPIO_HIGH);
+
+                offset = (ctrl & NAND_CLE) ? IXDP425_NAND_CMD_BYTE : 0;
+                offset |= (ctrl & NAND_ALE) ? IXDP425_NAND_ADDR_BYTE : 0;
+                this->priv = (void *)offset;
+        }
+
+        if (cmd != NAND_CMD_NONE)
+                writeb(cmd, this->IO_ADDR_W + offset);
+}
+
+static struct platform_nand_data ixdp425_flash_nand_data = {
+        .chip = {
+                .chip_delay             = 30,
+                .options                = NAND_NO_AUTOINCR,
+#ifdef CONFIG_MTD_PARTITIONS
+                .part_probe_types       = part_probes,
+                .partitions             = ixdp425_partitions,
+                .nr_partitions          = ARRAY_SIZE(ixdp425_partitions),
+#endif
+        },
+        .ctrl = {
+                .cmd_ctrl               = ixdp425_flash_nand_cmd_ctrl
+        }
+};
+
+static struct resource ixdp425_flash_nand_resource = {
+        .flags          = IORESOURCE_MEM,
+};
+
+static struct platform_device ixdp425_flash_nand = {
+        .name           = "gen_nand",
+        .id             = -1,
+        .dev            = {
+                .platform_data = &ixdp425_flash_nand_data,
+        },
+        .num_resources  = 1,
+        .resource       = &ixdp425_flash_nand_resource,
+};
+#endif  /* CONFIG_MTD_NAND_PLATFORM */
+
 static struct ixp4xx_i2c_pins ixdp425_i2c_gpio_pins = {
         .sda_pin        = IXDP425_SDA_PIN,
         .scl_pin        = IXDP425_SCL_PIN,
@@ -104,6 +180,10 @@ static struct platform_device ixdp425_uart = {
 static struct platform_device *ixdp425_devices[] __initdata = {
         &ixdp425_i2c_controller,
         &ixdp425_flash,
+#if defined(CONFIG_MTD_NAND_PLATFORM) || \
+    defined(CONFIG_MTD_NAND_PLATFORM_MODULE)
+        &ixdp425_flash_nand,
+#endif
         &ixdp425_uart
 };
 
@@ -115,6 +195,22 @@ static void __init ixdp425_init(void)
         ixdp425_flash_resource.end =
                 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 
+#if defined(CONFIG_MTD_NAND_PLATFORM) || \
+    defined(CONFIG_MTD_NAND_PLATFORM_MODULE)
+        ixdp425_flash_nand_resource.start = IXP4XX_EXP_BUS_BASE(3),
+        ixdp425_flash_nand_resource.end   = IXP4XX_EXP_BUS_BASE(3) + 0x10 - 1;
+
+        gpio_line_config(IXDP425_NAND_NCE_PIN, IXP4XX_GPIO_OUT);
+
+        /* Configure expansion bus for NAND Flash */
+        *IXP4XX_EXP_CS3 = IXP4XX_EXP_BUS_CS_EN |
+                          IXP4XX_EXP_BUS_STROBE_T(1) |  /* extend by 1 clock */
+                          IXP4XX_EXP_BUS_CYCLES(0) |    /* Intel cycles */
+                          IXP4XX_EXP_BUS_SIZE(0) |      /* 512bytes addr space*/
+                          IXP4XX_EXP_BUS_WR_EN |
+                          IXP4XX_EXP_BUS_BYTE_EN;       /* 8 bit data bus */
+#endif
+
         if (cpu_is_ixp43x()) {
                 ixdp425_uart.num_resources = 1;
                 ixdp425_uart_data[1].flags = 0;
diff --git a/include/asm-arm/arch-ixp4xx/ixdp425.h b/include/asm-arm/arch-ixp4xx/ixdp425.h
index 3d3820d7ba09..e0791af3bfea 100644
--- a/include/asm-arm/arch-ixp4xx/ixdp425.h
+++ b/include/asm-arm/arch-ixp4xx/ixdp425.h
@@ -32,4 +32,8 @@
 #define IXDP425_PCI_INTC_PIN    9
 #define IXDP425_PCI_INTD_PIN    8
 
+/* NAND Flash pins */
+#define IXDP425_NAND_NCE_PIN    12
 
+#define IXDP425_NAND_CMD_BYTE   0x01
+#define IXDP425_NAND_ADDR_BYTE  0x02