sunxi: add gpio driver

This patch enables CONFIG_CMD_GPIO for the Allwinner (sunxi) platform as well
as providing the common gpio API (gpio_request/free, direction in/out, get/set
etc).

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Ma Haijun <mahaijuns@gmail.com>
Signed-off-by: Oliver Schinagl <oliver@schinagl.nl>
Signed-off-by: Ian Campbell <ijc@hellion.org.uk>
Cc: Henrik Nordström <henrik@henriknordstrom.net>
Cc: Tom Cubie <Mr.hipboi@gmail.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>

arch/arm/include/asm/arch-sunxi/gpio.h

@@ -143,5 +143,7 @@ int sunxi_gpio_set_cfgpin(u32 pin, u32 val);
 int sunxi_gpio_get_cfgpin(u32 pin);
 int sunxi_gpio_set_drv(u32 pin, u32 val);
 int sunxi_gpio_set_pull(u32 pin, u32 val);
+int sunxi_name_to_gpio(const char *name);
+#define name_to_gpio(name) sunxi_name_to_gpio(name)
 
 #endif /* _SUNXI_GPIO_H */

drivers/gpio/Makefile

@@ -34,3 +34,4 @@ obj-$(CONFIG_XILINX_GPIO)	+= xilinx_gpio.o
 obj-$(CONFIG_ADI_GPIO2)	+= adi_gpio2.o
 obj-$(CONFIG_TCA642X)		+= tca642x.o
 oby-$(CONFIG_SX151X)		+= sx151x.o
+obj-$(CONFIG_SUNXI_GPIO)	+= sunxi_gpio.o

drivers/gpio/sunxi_gpio.c

@@ -0,0 +1,102 @@
+/*
+ * (C) Copyright 2012 Henrik Nordstrom <henrik@henriknordstrom.net>
+ *
+ * Based on earlier arch/arm/cpu/armv7/sunxi/gpio.c:
+ *
+ * (C) Copyright 2007-2011
+ * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
+ * Tom Cubie <tangliang@allwinnertech.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/gpio.h>
+
+static int sunxi_gpio_output(u32 pin, u32 val)
+{
+	u32 dat;
+	u32 bank = GPIO_BANK(pin);
+	u32 num = GPIO_NUM(pin);
+	struct sunxi_gpio *pio = BANK_TO_GPIO(bank);
+
+	dat = readl(&pio->dat);
+	if (val)
+		dat |= 0x1 << num;
+	else
+		dat &= ~(0x1 << num);
+
+	writel(dat, &pio->dat);
+
+	return 0;
+}
+
+static int sunxi_gpio_input(u32 pin)
+{
+	u32 dat;
+	u32 bank = GPIO_BANK(pin);
+	u32 num = GPIO_NUM(pin);
+	struct sunxi_gpio *pio = BANK_TO_GPIO(bank);
+
+	dat = readl(&pio->dat);
+	dat >>= num;
+
+	return dat & 0x1;
+}
+
+int gpio_request(unsigned gpio, const char *label)
+{
+	return 0;
+}
+
+int gpio_free(unsigned gpio)
+{
+	return 0;
+}
+
+int gpio_direction_input(unsigned gpio)
+{
+	sunxi_gpio_set_cfgpin(gpio, SUNXI_GPIO_INPUT);
+
+	return sunxi_gpio_input(gpio);
+}
+
+int gpio_direction_output(unsigned gpio, int value)
+{
+	sunxi_gpio_set_cfgpin(gpio, SUNXI_GPIO_OUTPUT);
+
+	return sunxi_gpio_output(gpio, value);
+}
+
+int gpio_get_value(unsigned gpio)
+{
+	return sunxi_gpio_input(gpio);
+}
+
+int gpio_set_value(unsigned gpio, int value)
+{
+	return sunxi_gpio_output(gpio, value);
+}
+
+int sunxi_name_to_gpio(const char *name)
+{
+	int group = 0;
+	int groupsize = 9 * 32;
+	long pin;
+	char *eptr;
+	if (*name == 'P' || *name == 'p')
+		name++;
+	if (*name >= 'A') {
+		group = *name - (*name > 'a' ? 'a' : 'A');
+		groupsize = 32;
+		name++;
+	}
+
+	pin = simple_strtol(name, &eptr, 10);
+	if (!*name || *eptr)
+		return -1;
+	if (pin < 0 || pin > groupsize || group >= 9)
+		return -1;
+	return group * 32 + pin;
+}

include/configs/sunxi-common.h

@@ -178,6 +178,10 @@
 #define CONFIG_CONS_INDEX              1       /* UART0 */
 #endif
 
+/* GPIO */
+#define CONFIG_SUNXI_GPIO
+#define CONFIG_CMD_GPIO
+
 /* Ethernet support */
 #ifdef CONFIG_SUNXI_EMAC
 #define CONFIG_MII			/* MII PHY management		*/