MTD: NAND: ams-delta: use GPIO instead of custom I/O

Don't use Amstrad Delta custom I/O functions for controlling the device,
use GPIO API instead.

While being at it, add missing gpio_free(AMS_DELTA_GPIO_PIN_NAND_RB).

Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Cc: David Woodhouse <dwmw2@infradead.org>
Reviewed-by: Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap1/board-ams-delta.c

@@ -236,36 +236,6 @@ static struct gpio latch_gpios[] __initconst = {
 		.flags	= GPIOF_OUT_INIT_LOW,
 		.label	= "lcd_ndisp",
 	},
-	{
-		.gpio	= AMS_DELTA_GPIO_PIN_NAND_NCE,
-		.flags	= GPIOF_OUT_INIT_LOW,
-		.label	= "nand_nce",
-	},
-	{
-		.gpio	= AMS_DELTA_GPIO_PIN_NAND_NRE,
-		.flags	= GPIOF_OUT_INIT_LOW,
-		.label	= "nand_nre",
-	},
-	{
-		.gpio	= AMS_DELTA_GPIO_PIN_NAND_NWP,
-		.flags	= GPIOF_OUT_INIT_LOW,
-		.label	= "nand_nwp",
-	},
-	{
-		.gpio	= AMS_DELTA_GPIO_PIN_NAND_NWE,
-		.flags	= GPIOF_OUT_INIT_LOW,
-		.label	= "nand_nwe",
-	},
-	{
-		.gpio	= AMS_DELTA_GPIO_PIN_NAND_ALE,
-		.flags	= GPIOF_OUT_INIT_LOW,
-		.label	= "nand_ale",
-	},
-	{
-		.gpio	= AMS_DELTA_GPIO_PIN_NAND_CLE,
-		.flags	= GPIOF_OUT_INIT_LOW,
-		.label	= "nand_cle",
-	},
 	{
 		.gpio	= AMS_DELTA_GPIO_PIN_KEYBRD_PWR,
 		.flags	= GPIOF_OUT_INIT_LOW,

arch/arm/plat-omap/include/plat/board-ams-delta.h

@@ -30,12 +30,6 @@
 
 #define AMS_DELTA_LATCH2_LCD_VBLEN	0x0001
 #define AMS_DELTA_LATCH2_LCD_NDISP	0x0002
-#define AMS_DELTA_LATCH2_NAND_NCE	0x0004
-#define AMS_DELTA_LATCH2_NAND_NRE	0x0008
-#define AMS_DELTA_LATCH2_NAND_NWP	0x0010
-#define AMS_DELTA_LATCH2_NAND_NWE	0x0020
-#define AMS_DELTA_LATCH2_NAND_ALE	0x0040
-#define AMS_DELTA_LATCH2_NAND_CLE	0x0080
 #define AMD_DELTA_LATCH2_KEYBRD_PWR	0x0100
 #define AMD_DELTA_LATCH2_KEYBRD_DATA	0x0200
 #define AMD_DELTA_LATCH2_SCARD_RSTIN	0x0400

drivers/mtd/nand/ams-delta.c

@@ -26,7 +26,7 @@
 #include <asm/io.h>
 #include <mach/hardware.h>
 #include <asm/sizes.h>
-#include <asm/gpio.h>
+#include <linux/gpio.h>
 #include <plat/board-ams-delta.h>
 
 /*
@@ -34,8 +34,6 @@
  */
 static struct mtd_info *ams_delta_mtd = NULL;
 
-#define NAND_MASK (AMS_DELTA_LATCH2_NAND_NRE | AMS_DELTA_LATCH2_NAND_NWE | AMS_DELTA_LATCH2_NAND_CLE | AMS_DELTA_LATCH2_NAND_ALE | AMS_DELTA_LATCH2_NAND_NCE | AMS_DELTA_LATCH2_NAND_NWP)
-
 /*
  * Define partitions for flash devices
  */
@@ -68,10 +66,9 @@ static void ams_delta_write_byte(struct mtd_info *mtd, u_char byte)
 
 	writew(0, io_base + OMAP_MPUIO_IO_CNTL);
 	writew(byte, this->IO_ADDR_W);
-	ams_delta_latch2_write(AMS_DELTA_LATCH2_NAND_NWE, 0);
+	gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_NWE, 0);
 	ndelay(40);
-	ams_delta_latch2_write(AMS_DELTA_LATCH2_NAND_NWE,
-			       AMS_DELTA_LATCH2_NAND_NWE);
+	gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_NWE, 1);
 }
 
 static u_char ams_delta_read_byte(struct mtd_info *mtd)
@@ -80,12 +77,11 @@ static u_char ams_delta_read_byte(struct mtd_info *mtd)
 	struct nand_chip *this = mtd->priv;
 	void __iomem *io_base = this->priv;
 
-	ams_delta_latch2_write(AMS_DELTA_LATCH2_NAND_NRE, 0);
+	gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_NRE, 0);
 	ndelay(40);
 	writew(~0, io_base + OMAP_MPUIO_IO_CNTL);
 	res = readw(this->IO_ADDR_R);
-	ams_delta_latch2_write(AMS_DELTA_LATCH2_NAND_NRE,
-			       AMS_DELTA_LATCH2_NAND_NRE);
+	gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_NRE, 1);
 
 	return res;
 }
@@ -132,15 +128,12 @@ static void ams_delta_hwcontrol(struct mtd_info *mtd, int cmd,
 {
 
 	if (ctrl & NAND_CTRL_CHANGE) {
-		unsigned long bits;
-
-		bits = (~ctrl & NAND_NCE) ? AMS_DELTA_LATCH2_NAND_NCE : 0;
-		bits |= (ctrl & NAND_CLE) ? AMS_DELTA_LATCH2_NAND_CLE : 0;
-		bits |= (ctrl & NAND_ALE) ? AMS_DELTA_LATCH2_NAND_ALE : 0;
-
-		ams_delta_latch2_write(AMS_DELTA_LATCH2_NAND_CLE |
-				AMS_DELTA_LATCH2_NAND_ALE |
-				AMS_DELTA_LATCH2_NAND_NCE, bits);
+		gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_NCE,
+				(ctrl & NAND_NCE) == 0);
+		gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_CLE,
+				(ctrl & NAND_CLE) != 0);
+		gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_ALE,
+				(ctrl & NAND_ALE) != 0);
 	}
 
 	if (cmd != NAND_CMD_NONE)
@@ -152,6 +145,39 @@ static int ams_delta_nand_ready(struct mtd_info *mtd)
 	return gpio_get_value(AMS_DELTA_GPIO_PIN_NAND_RB);
 }
 
+static struct gpio _mandatory_gpio[] __initconst_or_module = {
+	{
+		.gpio	= AMS_DELTA_GPIO_PIN_NAND_NCE,
+		.flags	= GPIOF_OUT_INIT_HIGH,
+		.label	= "nand_nce",
+	},
+	{
+		.gpio	= AMS_DELTA_GPIO_PIN_NAND_NRE,
+		.flags	= GPIOF_OUT_INIT_HIGH,
+		.label	= "nand_nre",
+	},
+	{
+		.gpio	= AMS_DELTA_GPIO_PIN_NAND_NWP,
+		.flags	= GPIOF_OUT_INIT_HIGH,
+		.label	= "nand_nwp",
+	},
+	{
+		.gpio	= AMS_DELTA_GPIO_PIN_NAND_NWE,
+		.flags	= GPIOF_OUT_INIT_HIGH,
+		.label	= "nand_nwe",
+	},
+	{
+		.gpio	= AMS_DELTA_GPIO_PIN_NAND_ALE,
+		.flags	= GPIOF_OUT_INIT_LOW,
+		.label	= "nand_ale",
+	},
+	{
+		.gpio	= AMS_DELTA_GPIO_PIN_NAND_CLE,
+		.flags	= GPIOF_OUT_INIT_LOW,
+		.label	= "nand_cle",
+	},
+};
+
 /*
  * Main initialization routine
  */
@@ -223,10 +249,9 @@ static int __devinit ams_delta_init(struct platform_device *pdev)
 	platform_set_drvdata(pdev, io_base);
 
 	/* Set chip enabled, but  */
-	ams_delta_latch2_write(NAND_MASK, AMS_DELTA_LATCH2_NAND_NRE |
-					  AMS_DELTA_LATCH2_NAND_NWE |
-					  AMS_DELTA_LATCH2_NAND_NCE |
-					  AMS_DELTA_LATCH2_NAND_NWP);
+	err = gpio_request_array(_mandatory_gpio, ARRAY_SIZE(_mandatory_gpio));
+	if (err)
+		goto out_gpio;
 
 	/* Scan to find existence of the device */
 	if (nand_scan(ams_delta_mtd, 1)) {
@@ -241,7 +266,10 @@ static int __devinit ams_delta_init(struct platform_device *pdev)
 	goto out;
 
  out_mtd:
+	gpio_free_array(_mandatory_gpio, ARRAY_SIZE(_mandatory_gpio));
+out_gpio:
 	platform_set_drvdata(pdev, NULL);
+	gpio_free(AMS_DELTA_GPIO_PIN_NAND_RB);
 	iounmap(io_base);
 out_release_io:
 	release_mem_region(res->start, resource_size(res));
@@ -262,6 +290,8 @@ static int __devexit ams_delta_cleanup(struct platform_device *pdev)
 	/* Release resources, unregister device */
 	nand_release(ams_delta_mtd);
 
+	gpio_free_array(_mandatory_gpio, ARRAY_SIZE(_mandatory_gpio));
+	gpio_free(AMS_DELTA_GPIO_PIN_NAND_RB);
 	iounmap(io_base);
 	release_mem_region(res->start, resource_size(res));