mtd: Update ep93xx/ts72xx to use generic platform nand driver

Update the ts72xx platform's nand driver support.

This changes the ts72xx platform from using a custom nand driver
(ts7250.c) to the generic platform nand driver (plat_nand.c).

Tested on TS-7250 with 32MiB NAND.
Signed-off-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Tested-by: NMatthieu Crapet <mcrapet@gmail.com>
Cc: Jesse Off <joff@embeddedARM.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

arch/arm/mach-ep93xx/ts72xx.c

@@ -10,12 +10,16 @@
  * your option) any later version.
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/m48t86.h>
 #include <linux/mtd/physmap.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
 
 #include <mach/hardware.h>
 #include <mach/ts72xx.h>
@@ -54,92 +58,162 @@ static struct map_desc ts72xx_io_desc[] __initdata = {
 	}
 };
 
-static struct map_desc ts72xx_nand_io_desc[] __initdata = {
-	{
-		.virtual	= TS72XX_NAND_DATA_VIRT_BASE,
-		.pfn		= __phys_to_pfn(TS72XX_NAND1_DATA_PHYS_BASE),
-		.length		= TS72XX_NAND_DATA_SIZE,
-		.type		= MT_DEVICE,
-	}, {
-		.virtual	= TS72XX_NAND_CONTROL_VIRT_BASE,
-		.pfn		= __phys_to_pfn(TS72XX_NAND1_CONTROL_PHYS_BASE),
-		.length		= TS72XX_NAND_CONTROL_SIZE,
-		.type		= MT_DEVICE,
-	}, {
-		.virtual	= TS72XX_NAND_BUSY_VIRT_BASE,
-		.pfn		= __phys_to_pfn(TS72XX_NAND1_BUSY_PHYS_BASE),
-		.length		= TS72XX_NAND_BUSY_SIZE,
-		.type		= MT_DEVICE,
+static void __init ts72xx_map_io(void)
+{
+	ep93xx_map_io();
+	iotable_init(ts72xx_io_desc, ARRAY_SIZE(ts72xx_io_desc));
+}
+
+
+/*************************************************************************
+ * NAND flash
+ *************************************************************************/
+#define TS72XX_NAND_CONTROL_ADDR_LINE	22	/* 0xN0400000 */
+#define TS72XX_NAND_BUSY_ADDR_LINE	23	/* 0xN0800000 */
+
+static void ts72xx_nand_hwcontrol(struct mtd_info *mtd,
+				  int cmd, unsigned int ctrl)
+{
+	struct nand_chip *chip = mtd->priv;
+
+	if (ctrl & NAND_CTRL_CHANGE) {
+		void __iomem *addr = chip->IO_ADDR_R;
+		unsigned char bits;
+
+		addr += (1 << TS72XX_NAND_CONTROL_ADDR_LINE);
+
+		bits = __raw_readb(addr) & ~0x07;
+		bits |= (ctrl & NAND_NCE) << 2;	/* bit 0 -> bit 2 */
+		bits |= (ctrl & NAND_CLE);	/* bit 1 -> bit 1 */
+		bits |= (ctrl & NAND_ALE) >> 2;	/* bit 2 -> bit 0 */
+
+		__raw_writeb(bits, addr);
 	}
-};
 
-static struct map_desc ts72xx_alternate_nand_io_desc[] __initdata = {
+	if (cmd != NAND_CMD_NONE)
+		__raw_writeb(cmd, chip->IO_ADDR_W);
+}
+
+static int ts72xx_nand_device_ready(struct mtd_info *mtd)
+{
+	struct nand_chip *chip = mtd->priv;
+	void __iomem *addr = chip->IO_ADDR_R;
+
+	addr += (1 << TS72XX_NAND_BUSY_ADDR_LINE);
+
+	return !!(__raw_readb(addr) & 0x20);
+}
+
+static const char *ts72xx_nand_part_probes[] = { "cmdlinepart", NULL };
+
+#define TS72XX_BOOTROM_PART_SIZE	(SZ_16K)
+#define TS72XX_REDBOOT_PART_SIZE	(SZ_2M + SZ_1M)
+
+static struct mtd_partition ts72xx_nand_parts[] = {
 	{
-		.virtual	= TS72XX_NAND_DATA_VIRT_BASE,
-		.pfn		= __phys_to_pfn(TS72XX_NAND2_DATA_PHYS_BASE),
-		.length		= TS72XX_NAND_DATA_SIZE,
-		.type		= MT_DEVICE,
+		.name		= "TS-BOOTROM",
+		.offset		= 0,
+		.size		= TS72XX_BOOTROM_PART_SIZE,
+		.mask_flags	= MTD_WRITEABLE,	/* force read-only */
 	}, {
-		.virtual	= TS72XX_NAND_CONTROL_VIRT_BASE,
-		.pfn		= __phys_to_pfn(TS72XX_NAND2_CONTROL_PHYS_BASE),
-		.length		= TS72XX_NAND_CONTROL_SIZE,
-		.type		= MT_DEVICE,
+		.name		= "Linux",
+		.offset		= MTDPART_OFS_APPEND,
+		.size		= 0,			/* filled in later */
 	}, {
-		.virtual	= TS72XX_NAND_BUSY_VIRT_BASE,
-		.pfn		= __phys_to_pfn(TS72XX_NAND2_BUSY_PHYS_BASE),
-		.length		= TS72XX_NAND_BUSY_SIZE,
-		.type		= MT_DEVICE,
-	}
+		.name		= "RedBoot",
+		.offset		= MTDPART_OFS_APPEND,
+		.size		= MTDPART_SIZ_FULL,
+		.mask_flags	= MTD_WRITEABLE,	/* force read-only */
+	},
 };
 
-static void __init ts72xx_map_io(void)
+static void ts72xx_nand_set_parts(uint64_t size,
+				  struct platform_nand_chip *chip)
 {
-	ep93xx_map_io();
-	iotable_init(ts72xx_io_desc, ARRAY_SIZE(ts72xx_io_desc));
+	/* Factory TS-72xx boards only come with 32MiB or 128MiB NAND options */
+	if (size == SZ_32M || size == SZ_128M) {
+		/* Set the "Linux" partition size */
+		ts72xx_nand_parts[1].size = size - TS72XX_REDBOOT_PART_SIZE;
 
-	/*
-	 * The TS-7200 has NOR flash, the other models have NAND flash.
-	 */
-	if (!board_is_ts7200()) {
-		if (is_ts9420_installed()) {
-			iotable_init(ts72xx_alternate_nand_io_desc,
-				ARRAY_SIZE(ts72xx_alternate_nand_io_desc));
-		} else {
-			iotable_init(ts72xx_nand_io_desc,
-				ARRAY_SIZE(ts72xx_nand_io_desc));
-		}
+		chip->partitions = ts72xx_nand_parts;
+		chip->nr_partitions = ARRAY_SIZE(ts72xx_nand_parts);
+	} else {
+		pr_warning("Unknown nand disk size:%lluMiB\n", size >> 20);
 	}
 }
 
+static struct platform_nand_data ts72xx_nand_data = {
+	.chip = {
+		.nr_chips	= 1,
+		.chip_offset	= 0,
+		.chip_delay	= 15,
+		.part_probe_types = ts72xx_nand_part_probes,
+		.set_parts	= ts72xx_nand_set_parts,
+	},
+	.ctrl = {
+		.cmd_ctrl	= ts72xx_nand_hwcontrol,
+		.dev_ready	= ts72xx_nand_device_ready,
+	},
+};
+
+static struct resource ts72xx_nand_resource[] = {
+	{
+		.start		= 0,			/* filled in later */
+		.end		= 0,			/* filled in later */
+		.flags		= IORESOURCE_MEM,
+	},
+};
+
+static struct platform_device ts72xx_nand_flash = {
+	.name			= "gen_nand",
+	.id			= -1,
+	.dev.platform_data	= &ts72xx_nand_data,
+	.resource		= ts72xx_nand_resource,
+	.num_resources		= ARRAY_SIZE(ts72xx_nand_resource),
+};
+
+
 /*************************************************************************
  * NOR flash (TS-7200 only)
  *************************************************************************/
-static struct physmap_flash_data ts72xx_flash_data = {
+static struct physmap_flash_data ts72xx_nor_data = {
 	.width		= 2,
 };
 
-static struct resource ts72xx_flash_resource = {
+static struct resource ts72xx_nor_resource = {
 	.start		= EP93XX_CS6_PHYS_BASE,
 	.end		= EP93XX_CS6_PHYS_BASE + SZ_16M - 1,
 	.flags		= IORESOURCE_MEM,
 };
 
-static struct platform_device ts72xx_flash = {
-	.name		= "physmap-flash",
-	.id		= 0,
-	.dev		= {
-		.platform_data	= &ts72xx_flash_data,
-	},
-	.num_resources	= 1,
-	.resource	= &ts72xx_flash_resource,
+static struct platform_device ts72xx_nor_flash = {
+	.name			= "physmap-flash",
+	.id			= 0,
+	.dev.platform_data	= &ts72xx_nor_data,
+	.resource		= &ts72xx_nor_resource,
+	.num_resources		= 1,
 };
 
 static void __init ts72xx_register_flash(void)
 {
-	if (board_is_ts7200())
-		platform_device_register(&ts72xx_flash);
+	if (board_is_ts7200()) {
+		platform_device_register(&ts72xx_nor_flash);
+	} else {
+		resource_size_t start;
+
+		if (is_ts9420_installed())
+			start = EP93XX_CS7_PHYS_BASE;
+		else
+			start = EP93XX_CS6_PHYS_BASE;
+
+		ts72xx_nand_resource[0].start = start;
+		ts72xx_nand_resource[0].end = start + SZ_16M - 1;
+
+		platform_device_register(&ts72xx_nand_flash);
+	}
 }
 
+
 static unsigned char ts72xx_rtc_readbyte(unsigned long addr)
 {
 	__raw_writeb(addr, TS72XX_RTC_INDEX_VIRT_BASE);