summaryrefslogtreecommitdiff
path: root/drivers
diff options
context:
space:
mode:
authorIan Campbell <ijc@hellion.org.uk>2014-06-05 19:00:15 +0100
committerIan Campbell <ijc@hellion.org.uk>2014-07-18 19:42:25 +0100
commitabce2c6220c1f8f4b66e464adc1074e04a8f19eb (patch)
treed48a9aa6537f70b5699d06f06d996678d4e4bbf5 /drivers
parent5c58f8b685fbb201fd93af2a010eecd26c78bb4e (diff)
downloadu-boot-imx-abce2c6220c1f8f4b66e464adc1074e04a8f19eb.zip
u-boot-imx-abce2c6220c1f8f4b66e464adc1074e04a8f19eb.tar.gz
u-boot-imx-abce2c6220c1f8f4b66e464adc1074e04a8f19eb.tar.bz2
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpio/Makefile1
-rw-r--r--drivers/gpio/sunxi_gpio.c102
2 files changed, 103 insertions, 0 deletions
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 4e001e1..86813b9 100644
--- a/drivers/gpio/Makefile
+++ b/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
diff --git a/drivers/gpio/sunxi_gpio.c b/drivers/gpio/sunxi_gpio.c
new file mode 100644
index 0000000..0c50a8f
--- /dev/null
+++ b/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;
+}