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Diffstat (limited to 'arch/blackfin/mach-bf538/ext-gpio.c')
-rw-r--r--arch/blackfin/mach-bf538/ext-gpio.c123
1 files changed, 123 insertions, 0 deletions
diff --git a/arch/blackfin/mach-bf538/ext-gpio.c b/arch/blackfin/mach-bf538/ext-gpio.c
new file mode 100644
index 00000000000..180b1252679
--- /dev/null
+++ b/arch/blackfin/mach-bf538/ext-gpio.c
@@ -0,0 +1,123 @@
+/*
+ * GPIOLIB interface for BF538/9 PORT C, D, and E GPIOs
+ *
+ * Copyright 2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <asm/blackfin.h>
+#include <asm/gpio.h>
+#include <asm/portmux.h>
+
+#define DEFINE_REG(reg, off) \
+static inline u16 read_##reg(void __iomem *port) \
+ { return bfin_read16(port + off); } \
+static inline void write_##reg(void __iomem *port, u16 v) \
+ { bfin_write16(port + off, v); }
+
+DEFINE_REG(PORTIO, 0x00)
+DEFINE_REG(PORTIO_CLEAR, 0x10)
+DEFINE_REG(PORTIO_SET, 0x20)
+DEFINE_REG(PORTIO_DIR, 0x40)
+DEFINE_REG(PORTIO_INEN, 0x50)
+
+static void __iomem *gpio_chip_to_mmr(struct gpio_chip *chip)
+{
+ switch (chip->base) {
+ default: /* not really needed, but keeps gcc happy */
+ case GPIO_PC0: return (void __iomem *)PORTCIO;
+ case GPIO_PD0: return (void __iomem *)PORTDIO;
+ case GPIO_PE0: return (void __iomem *)PORTEIO;
+ }
+}
+
+static int bf538_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
+{
+ void __iomem *port = gpio_chip_to_mmr(chip);
+ return !!(read_PORTIO(port) & (1u << gpio));
+}
+
+static void bf538_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
+{
+ void __iomem *port = gpio_chip_to_mmr(chip);
+ if (value)
+ write_PORTIO_SET(port, (1u << gpio));
+ else
+ write_PORTIO_CLEAR(port, (1u << gpio));
+}
+
+static int bf538_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
+{
+ void __iomem *port = gpio_chip_to_mmr(chip);
+ write_PORTIO_DIR(port, read_PORTIO_DIR(port) & ~(1u << gpio));
+ write_PORTIO_INEN(port, read_PORTIO_INEN(port) | (1u << gpio));
+ return 0;
+}
+
+static int bf538_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int value)
+{
+ void __iomem *port = gpio_chip_to_mmr(chip);
+ write_PORTIO_INEN(port, read_PORTIO_INEN(port) & ~(1u << gpio));
+ bf538_gpio_set_value(port, gpio, value);
+ write_PORTIO_DIR(port, read_PORTIO_DIR(port) | (1u << gpio));
+ return 0;
+}
+
+static int bf538_gpio_request(struct gpio_chip *chip, unsigned gpio)
+{
+ return bfin_special_gpio_request(chip->base + gpio, chip->label);
+}
+
+static void bf538_gpio_free(struct gpio_chip *chip, unsigned gpio)
+{
+ return bfin_special_gpio_free(chip->base + gpio);
+}
+
+/* We don't set the irq fields as these banks cannot generate interrupts */
+
+static struct gpio_chip bf538_portc_chip = {
+ .label = "GPIO-PC",
+ .direction_input = bf538_gpio_direction_input,
+ .get = bf538_gpio_get_value,
+ .direction_output = bf538_gpio_direction_output,
+ .set = bf538_gpio_set_value,
+ .request = bf538_gpio_request,
+ .free = bf538_gpio_free,
+ .base = GPIO_PC0,
+ .ngpio = GPIO_PC9 - GPIO_PC0 + 1,
+};
+
+static struct gpio_chip bf538_portd_chip = {
+ .label = "GPIO-PD",
+ .direction_input = bf538_gpio_direction_input,
+ .get = bf538_gpio_get_value,
+ .direction_output = bf538_gpio_direction_output,
+ .set = bf538_gpio_set_value,
+ .request = bf538_gpio_request,
+ .free = bf538_gpio_free,
+ .base = GPIO_PD0,
+ .ngpio = GPIO_PD13 - GPIO_PD0 + 1,
+};
+
+static struct gpio_chip bf538_porte_chip = {
+ .label = "GPIO-PE",
+ .direction_input = bf538_gpio_direction_input,
+ .get = bf538_gpio_get_value,
+ .direction_output = bf538_gpio_direction_output,
+ .set = bf538_gpio_set_value,
+ .request = bf538_gpio_request,
+ .free = bf538_gpio_free,
+ .base = GPIO_PE0,
+ .ngpio = GPIO_PE15 - GPIO_PE0 + 1,
+};
+
+static int __init bf538_extgpio_setup(void)
+{
+ return gpiochip_add(&bf538_portc_chip) |
+ gpiochip_add(&bf538_portd_chip) |
+ gpiochip_add(&bf538_porte_chip);
+}
+arch_initcall(bf538_extgpio_setup);