[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 ec4f079..d5008d8 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 3d3820d..e0791af 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