Fixed MTP to work with TWRP

arch/blackfin/mach-bf538/ext-gpio.c

@@ -0,0 +1,158 @@
+/*
+ * GPIOLIB interface for BF538/9 PORT C, D, and E GPIOs
+ *
+ * Copyright 2009-2011 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);
+
+#ifdef CONFIG_PM
+static struct {
+	u16 data, dir, inen;
+} gpio_bank_saved[3];
+
+static void __iomem * const port_bases[3] = {
+	(void *)PORTCIO,
+	(void *)PORTDIO,
+	(void *)PORTEIO,
+};
+
+void bfin_special_gpio_pm_hibernate_suspend(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(port_bases); ++i) {
+		gpio_bank_saved[i].data = read_PORTIO(port_bases[i]);
+		gpio_bank_saved[i].inen = read_PORTIO_INEN(port_bases[i]);
+		gpio_bank_saved[i].dir = read_PORTIO_DIR(port_bases[i]);
+	}
+}
+
+void bfin_special_gpio_pm_hibernate_restore(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(port_bases); ++i) {
+		write_PORTIO_INEN(port_bases[i], gpio_bank_saved[i].inen);
+		write_PORTIO_SET(port_bases[i],
+			gpio_bank_saved[i].data & gpio_bank_saved[i].dir);
+		write_PORTIO_DIR(port_bases[i], gpio_bank_saved[i].dir);
+	}
+}
+#endif