drivers/gpio/sunxi_gpio.c - u-boot - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * (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>
  */

 #include <common.h>
 #include <dm.h>
 #include <errno.h>
 #include <fdtdec.h>
 #include <malloc.h>
 #include <asm/io.h>
 #include <asm/gpio.h>
 #include <dt-bindings/gpio/gpio.h>
 #include <sunxi_gpio.h>

 /*
  * =======================================================================
  * Low level GPIO/pin controller access functions, to be shared by non-DM
  * SPL code and the DM pinctrl/GPIO drivers.
  * The functions ending in "bank" take a base pointer to a GPIO bank, and
  * the pin offset is relative to that bank.
  * The functions without "bank" in their name take a linear GPIO number,
  * covering all ports, and starting at 0 for PortA.
  * =======================================================================
  */

 #define GPIO_BANK(pin)		((pin) >> 5)
 #define GPIO_NUM(pin)		((pin) & 0x1f)

 #define GPIO_CFG_REG_OFFSET	0x00
 #define GPIO_CFG_INDEX(pin)	(((pin) & 0x1f) >> 3)
 #define GPIO_CFG_OFFSET(pin)	((((pin) & 0x1f) & 0x7) << 2)

 #define GPIO_DAT_REG_OFFSET	0x10

 #define GPIO_DRV_REG_OFFSET	0x14

 /*		Newer SoCs use a slightly different register layout */
 #ifdef CONFIG_SUNXI_NEW_PINCTRL
 /* pin drive strength: 4 bits per pin */
 #define GPIO_DRV_INDEX(pin)	((pin) / 8)
 #define GPIO_DRV_OFFSET(pin)	(((pin) % 8) * 4)

 #define GPIO_PULL_REG_OFFSET	0x24

 #else /* older generation pin controllers */
 /* pin drive strength: 2 bits per pin */
 #define GPIO_DRV_INDEX(pin)	((pin) / 16)
 #define GPIO_DRV_OFFSET(pin)	(((pin) % 16) * 2)

 #define GPIO_PULL_REG_OFFSET	0x1c
 #endif

 #define GPIO_PULL_INDEX(pin)	(((pin) & 0x1f) >> 4)
 #define GPIO_PULL_OFFSET(pin)	((((pin) & 0x1f) & 0xf) << 1)

 static void* BANK_TO_GPIO(int bank)
 {
 	void *pio_base;

 	if (bank < SUNXI_GPIO_L) {
 		pio_base = (void *)(uintptr_t)SUNXI_PIO_BASE;
 	} else {
 		pio_base = (void *)(uintptr_t)SUNXI_R_PIO_BASE;
 		bank -= SUNXI_GPIO_L;
 	}

 	return pio_base + bank * SUNXI_PINCTRL_BANK_SIZE;
 }

 void sunxi_gpio_set_cfgbank(void *bank_base, int pin_offset, u32 val)
 {
 	u32 index = GPIO_CFG_INDEX(pin_offset);
 	u32 offset = GPIO_CFG_OFFSET(pin_offset);

 	clrsetbits_le32(bank_base + GPIO_CFG_REG_OFFSET + index * 4,
 			0xfU << offset, val << offset);
 }

 void sunxi_gpio_set_cfgpin(u32 pin, u32 val)
 {
 	u32 bank = GPIO_BANK(pin);
 	void *pio = BANK_TO_GPIO(bank);

 	sunxi_gpio_set_cfgbank(pio, GPIO_NUM(pin), val);
 }

 int sunxi_gpio_get_cfgbank(void *bank_base, int pin_offset)
 {
 	u32 index = GPIO_CFG_INDEX(pin_offset);
 	u32 offset = GPIO_CFG_OFFSET(pin_offset);
 	u32 cfg;

 	cfg = readl(bank_base + GPIO_CFG_REG_OFFSET + index * 4);
 	cfg >>= offset;

 	return cfg & 0xf;
 }

 int sunxi_gpio_get_cfgpin(u32 pin)
 {
 	u32 bank = GPIO_BANK(pin);
 	void *bank_base = BANK_TO_GPIO(bank);

 	return sunxi_gpio_get_cfgbank(bank_base, GPIO_NUM(pin));
 }

 static void sunxi_gpio_set_value_bank(void *bank_base, int pin, bool set)
 {
 	u32 mask = 1U << pin;

 	clrsetbits_le32(bank_base + GPIO_DAT_REG_OFFSET,
 			set ? 0 : mask, set ? mask : 0);
 }

 static int sunxi_gpio_get_value_bank(void *bank_base, int pin)
 {
 	return !!(readl(bank_base + GPIO_DAT_REG_OFFSET) & (1U << pin));
 }

 void sunxi_gpio_set_drv(u32 pin, u32 val)
 {
 	u32 bank = GPIO_BANK(pin);
 	void *bank_base = BANK_TO_GPIO(bank);

 	sunxi_gpio_set_drv_bank(bank_base, GPIO_NUM(pin), val);
 }

 void sunxi_gpio_set_drv_bank(void *bank_base, u32 pin_offset, u32 val)
 {
 	u32 index = GPIO_DRV_INDEX(pin_offset);
 	u32 offset = GPIO_DRV_OFFSET(pin_offset);

 	clrsetbits_le32(bank_base + GPIO_DRV_REG_OFFSET + index * 4,
 			0x3U << offset, val << offset);
 }

 void sunxi_gpio_set_pull(u32 pin, u32 val)
 {
 	u32 bank = GPIO_BANK(pin);
 	void *bank_base = BANK_TO_GPIO(bank);

 	sunxi_gpio_set_pull_bank(bank_base, GPIO_NUM(pin), val);
 }

 void sunxi_gpio_set_pull_bank(void *bank_base, int pin_offset, u32 val)
 {
 	u32 index = GPIO_PULL_INDEX(pin_offset);
 	u32 offset = GPIO_PULL_OFFSET(pin_offset);

 	clrsetbits_le32(bank_base + GPIO_PULL_REG_OFFSET + index * 4,
 			0x3U << offset, val << offset);
 }


 /* =========== Non-DM code, used by the SPL. ============ */

 #if !CONFIG_IS_ENABLED(DM_GPIO)
 static void sunxi_gpio_set_value(u32 pin, bool set)
 {
 	u32 bank = GPIO_BANK(pin);
 	void *pio = BANK_TO_GPIO(bank);

 	sunxi_gpio_set_value_bank(pio, GPIO_NUM(pin), set);
 }

 static int sunxi_gpio_get_value(u32 pin)
 {
 	u32 bank = GPIO_BANK(pin);
 	void *pio = BANK_TO_GPIO(bank);

 	return sunxi_gpio_get_value_bank(pio, GPIO_NUM(pin));
 }

 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 0;
 }

 int gpio_direction_output(unsigned gpio, int value)
 {
 	sunxi_gpio_set_cfgpin(gpio, SUNXI_GPIO_OUTPUT);
 	sunxi_gpio_set_value(gpio, value);

 	return 0;
 }

 int gpio_get_value(unsigned gpio)
 {
 	return sunxi_gpio_get_value(gpio);
 }

 int gpio_set_value(unsigned gpio, int value)
 {
 	sunxi_gpio_set_value(gpio, value);

 	return 0;
 }

 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;
 }
 #endif /* !DM_GPIO */

 /* =========== DM code, used by U-Boot proper. ============ */

 #if CONFIG_IS_ENABLED(DM_GPIO)
 /* TODO(sjg@chromium.org): Remove this function and use device tree */
 int sunxi_name_to_gpio(const char *name)
 {
 	unsigned int gpio;
 	int ret;
 #if !defined CONFIG_SPL_BUILD && defined CONFIG_AXP_GPIO
 	char lookup[8];

 	if (strcasecmp(name, "AXP0-VBUS-ENABLE") == 0) {
 		sprintf(lookup, SUNXI_GPIO_AXP0_PREFIX "%d",
 			SUNXI_GPIO_AXP0_VBUS_ENABLE);
 		name = lookup;
 	}
 #endif
 	ret = gpio_lookup_name(name, NULL, NULL, &gpio);

 	return ret ? ret : gpio;
 }

 static int sunxi_gpio_get_value(struct udevice *dev, unsigned offset)
 {
 	struct sunxi_gpio_plat *plat = dev_get_plat(dev);

 	return sunxi_gpio_get_value_bank(plat->regs, offset);
 }

 static int sunxi_gpio_get_function(struct udevice *dev, unsigned offset)
 {
 	struct sunxi_gpio_plat *plat = dev_get_plat(dev);
 	int func;

 	func = sunxi_gpio_get_cfgbank(plat->regs, offset);
 	if (func == SUNXI_GPIO_OUTPUT)
 		return GPIOF_OUTPUT;
 	else if (func == SUNXI_GPIO_INPUT)
 		return GPIOF_INPUT;
 	else
 		return GPIOF_FUNC;
 }

 static int sunxi_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
 			    struct ofnode_phandle_args *args)
 {
 	int ret;

 	ret = device_get_child(dev, args->args[0], &desc->dev);
 	if (ret)
 		return ret;
 	desc->offset = args->args[1];
 	desc->flags = gpio_flags_xlate(args->args[2]);

 	return 0;
 }

 static int sunxi_gpio_set_flags(struct udevice *dev, unsigned int offset,
 				ulong flags)
 {
 	struct sunxi_gpio_plat *plat = dev_get_plat(dev);

 	if (flags & GPIOD_IS_OUT) {
 		u32 value = !!(flags & GPIOD_IS_OUT_ACTIVE);

 		sunxi_gpio_set_value_bank(plat->regs, offset, value);
 		sunxi_gpio_set_cfgbank(plat->regs, offset, SUNXI_GPIO_OUTPUT);
 	} else if (flags & GPIOD_IS_IN) {
 		u32 pull = 0;

 		if (flags & GPIOD_PULL_UP)
 			pull = 1;
 		else if (flags & GPIOD_PULL_DOWN)
 			pull = 2;
 		sunxi_gpio_set_pull_bank(plat->regs, offset, pull);
 		sunxi_gpio_set_cfgbank(plat->regs, offset, SUNXI_GPIO_INPUT);
 	}

 	return 0;
 }

 static const struct dm_gpio_ops gpio_sunxi_ops = {
 	.get_value		= sunxi_gpio_get_value,
 	.get_function		= sunxi_gpio_get_function,
 	.xlate			= sunxi_gpio_xlate,
 	.set_flags		= sunxi_gpio_set_flags,
 };

 static int gpio_sunxi_probe(struct udevice *dev)
 {
 	struct sunxi_gpio_plat *plat = dev_get_plat(dev);
 	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);

 	/* Tell the uclass how many GPIOs we have */
 	if (plat) {
 		uc_priv->gpio_count = SUNXI_GPIOS_PER_BANK;
 		uc_priv->bank_name = plat->bank_name;
 	}

 	return 0;
 }

 U_BOOT_DRIVER(gpio_sunxi) = {
 	.name	= "gpio_sunxi",
 	.id	= UCLASS_GPIO,
 	.probe	= gpio_sunxi_probe,
 	.ops	= &gpio_sunxi_ops,
 };
 #endif /* DM_GPIO */
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* (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>
	*/

	#include <common.h>
	#include <dm.h>
	#include <errno.h>
	#include <fdtdec.h>
	#include <malloc.h>
	#include <asm/io.h>
	#include <asm/gpio.h>
	#include <dt-bindings/gpio/gpio.h>
	#include <sunxi_gpio.h>

	/*
	* =======================================================================
	* Low level GPIO/pin controller access functions, to be shared by non-DM
	* SPL code and the DM pinctrl/GPIO drivers.
	* The functions ending in "bank" take a base pointer to a GPIO bank, and
	* the pin offset is relative to that bank.
	* The functions without "bank" in their name take a linear GPIO number,
	* covering all ports, and starting at 0 for PortA.
	* =======================================================================
	*/

	#define GPIO_BANK(pin) ((pin) >> 5)
	#define GPIO_NUM(pin) ((pin) & 0x1f)

	#define GPIO_CFG_REG_OFFSET 0x00
	#define GPIO_CFG_INDEX(pin) (((pin) & 0x1f) >> 3)
	#define GPIO_CFG_OFFSET(pin) ((((pin) & 0x1f) & 0x7) << 2)

	#define GPIO_DAT_REG_OFFSET 0x10

	#define GPIO_DRV_REG_OFFSET 0x14

	/* Newer SoCs use a slightly different register layout */
	#ifdef CONFIG_SUNXI_NEW_PINCTRL
	/* pin drive strength: 4 bits per pin */
	#define GPIO_DRV_INDEX(pin) ((pin) / 8)
	#define GPIO_DRV_OFFSET(pin) (((pin) % 8) * 4)

	#define GPIO_PULL_REG_OFFSET 0x24

	#else /* older generation pin controllers */
	/* pin drive strength: 2 bits per pin */
	#define GPIO_DRV_INDEX(pin) ((pin) / 16)
	#define GPIO_DRV_OFFSET(pin) (((pin) % 16) * 2)

	#define GPIO_PULL_REG_OFFSET 0x1c
	#endif

	#define GPIO_PULL_INDEX(pin) (((pin) & 0x1f) >> 4)
	#define GPIO_PULL_OFFSET(pin) ((((pin) & 0x1f) & 0xf) << 1)

	static void* BANK_TO_GPIO(int bank)
	{
	void *pio_base;

	if (bank < SUNXI_GPIO_L) {
	pio_base = (void *)(uintptr_t)SUNXI_PIO_BASE;
	} else {
	pio_base = (void *)(uintptr_t)SUNXI_R_PIO_BASE;
	bank -= SUNXI_GPIO_L;
	}

	return pio_base + bank * SUNXI_PINCTRL_BANK_SIZE;
	}

	void sunxi_gpio_set_cfgbank(void *bank_base, int pin_offset, u32 val)
	{
	u32 index = GPIO_CFG_INDEX(pin_offset);
	u32 offset = GPIO_CFG_OFFSET(pin_offset);

	clrsetbits_le32(bank_base + GPIO_CFG_REG_OFFSET + index * 4,
	0xfU << offset, val << offset);
	}

	void sunxi_gpio_set_cfgpin(u32 pin, u32 val)
	{
	u32 bank = GPIO_BANK(pin);
	void *pio = BANK_TO_GPIO(bank);

	sunxi_gpio_set_cfgbank(pio, GPIO_NUM(pin), val);
	}

	int sunxi_gpio_get_cfgbank(void *bank_base, int pin_offset)
	{
	u32 index = GPIO_CFG_INDEX(pin_offset);
	u32 offset = GPIO_CFG_OFFSET(pin_offset);
	u32 cfg;

	cfg = readl(bank_base + GPIO_CFG_REG_OFFSET + index * 4);
	cfg >>= offset;

	return cfg & 0xf;
	}

	int sunxi_gpio_get_cfgpin(u32 pin)
	{
	u32 bank = GPIO_BANK(pin);
	void *bank_base = BANK_TO_GPIO(bank);

	return sunxi_gpio_get_cfgbank(bank_base, GPIO_NUM(pin));
	}

	static void sunxi_gpio_set_value_bank(void *bank_base, int pin, bool set)
	{
	u32 mask = 1U << pin;

	clrsetbits_le32(bank_base + GPIO_DAT_REG_OFFSET,
	set ? 0 : mask, set ? mask : 0);
	}

	static int sunxi_gpio_get_value_bank(void *bank_base, int pin)
	{
	return !!(readl(bank_base + GPIO_DAT_REG_OFFSET) & (1U << pin));
	}

	void sunxi_gpio_set_drv(u32 pin, u32 val)
	{
	u32 bank = GPIO_BANK(pin);
	void *bank_base = BANK_TO_GPIO(bank);

	sunxi_gpio_set_drv_bank(bank_base, GPIO_NUM(pin), val);
	}

	void sunxi_gpio_set_drv_bank(void *bank_base, u32 pin_offset, u32 val)
	{
	u32 index = GPIO_DRV_INDEX(pin_offset);
	u32 offset = GPIO_DRV_OFFSET(pin_offset);

	clrsetbits_le32(bank_base + GPIO_DRV_REG_OFFSET + index * 4,
	0x3U << offset, val << offset);
	}

	void sunxi_gpio_set_pull(u32 pin, u32 val)
	{
	u32 bank = GPIO_BANK(pin);
	void *bank_base = BANK_TO_GPIO(bank);

	sunxi_gpio_set_pull_bank(bank_base, GPIO_NUM(pin), val);
	}

	void sunxi_gpio_set_pull_bank(void *bank_base, int pin_offset, u32 val)
	{
	u32 index = GPIO_PULL_INDEX(pin_offset);
	u32 offset = GPIO_PULL_OFFSET(pin_offset);

	clrsetbits_le32(bank_base + GPIO_PULL_REG_OFFSET + index * 4,
	0x3U << offset, val << offset);
	}


	/* =========== Non-DM code, used by the SPL. ============ */

	#if !CONFIG_IS_ENABLED(DM_GPIO)
	static void sunxi_gpio_set_value(u32 pin, bool set)
	{
	u32 bank = GPIO_BANK(pin);
	void *pio = BANK_TO_GPIO(bank);

	sunxi_gpio_set_value_bank(pio, GPIO_NUM(pin), set);
	}

	static int sunxi_gpio_get_value(u32 pin)
	{
	u32 bank = GPIO_BANK(pin);
	void *pio = BANK_TO_GPIO(bank);

	return sunxi_gpio_get_value_bank(pio, GPIO_NUM(pin));
	}

	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 0;
	}

	int gpio_direction_output(unsigned gpio, int value)
	{
	sunxi_gpio_set_cfgpin(gpio, SUNXI_GPIO_OUTPUT);
	sunxi_gpio_set_value(gpio, value);

	return 0;
	}

	int gpio_get_value(unsigned gpio)
	{
	return sunxi_gpio_get_value(gpio);
	}

	int gpio_set_value(unsigned gpio, int value)
	{
	sunxi_gpio_set_value(gpio, value);

	return 0;
	}

	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;
	}
	#endif /* !DM_GPIO */

	/* =========== DM code, used by U-Boot proper. ============ */

	#if CONFIG_IS_ENABLED(DM_GPIO)
	/* TODO(sjg@chromium.org): Remove this function and use device tree */
	int sunxi_name_to_gpio(const char *name)
	{
	unsigned int gpio;
	int ret;
	#if !defined CONFIG_SPL_BUILD && defined CONFIG_AXP_GPIO
	char lookup[8];

	if (strcasecmp(name, "AXP0-VBUS-ENABLE") == 0) {
	sprintf(lookup, SUNXI_GPIO_AXP0_PREFIX "%d",
	SUNXI_GPIO_AXP0_VBUS_ENABLE);
	name = lookup;
	}
	#endif
	ret = gpio_lookup_name(name, NULL, NULL, &gpio);

	return ret ? ret : gpio;
	}

	static int sunxi_gpio_get_value(struct udevice *dev, unsigned offset)
	{
	struct sunxi_gpio_plat *plat = dev_get_plat(dev);

	return sunxi_gpio_get_value_bank(plat->regs, offset);
	}

	static int sunxi_gpio_get_function(struct udevice *dev, unsigned offset)
	{
	struct sunxi_gpio_plat *plat = dev_get_plat(dev);
	int func;

	func = sunxi_gpio_get_cfgbank(plat->regs, offset);
	if (func == SUNXI_GPIO_OUTPUT)
	return GPIOF_OUTPUT;
	else if (func == SUNXI_GPIO_INPUT)
	return GPIOF_INPUT;
	else
	return GPIOF_FUNC;
	}

	static int sunxi_gpio_xlate(struct udevice dev, struct gpio_desc desc,
	struct ofnode_phandle_args *args)
	{
	int ret;

	ret = device_get_child(dev, args->args[0], &desc->dev);
	if (ret)
	return ret;
	desc->offset = args->args[1];
	desc->flags = gpio_flags_xlate(args->args[2]);

	return 0;
	}

	static int sunxi_gpio_set_flags(struct udevice *dev, unsigned int offset,
	ulong flags)
	{
	struct sunxi_gpio_plat *plat = dev_get_plat(dev);

	if (flags & GPIOD_IS_OUT) {
	u32 value = !!(flags & GPIOD_IS_OUT_ACTIVE);

	sunxi_gpio_set_value_bank(plat->regs, offset, value);
	sunxi_gpio_set_cfgbank(plat->regs, offset, SUNXI_GPIO_OUTPUT);
	} else if (flags & GPIOD_IS_IN) {
	u32 pull = 0;

	if (flags & GPIOD_PULL_UP)
	pull = 1;
	else if (flags & GPIOD_PULL_DOWN)
	pull = 2;
	sunxi_gpio_set_pull_bank(plat->regs, offset, pull);
	sunxi_gpio_set_cfgbank(plat->regs, offset, SUNXI_GPIO_INPUT);
	}

	return 0;
	}

	static const struct dm_gpio_ops gpio_sunxi_ops = {
	.get_value = sunxi_gpio_get_value,
	.get_function = sunxi_gpio_get_function,
	.xlate = sunxi_gpio_xlate,
	.set_flags = sunxi_gpio_set_flags,
	};

	static int gpio_sunxi_probe(struct udevice *dev)
	{
	struct sunxi_gpio_plat *plat = dev_get_plat(dev);
	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);

	/* Tell the uclass how many GPIOs we have */
	if (plat) {
	uc_priv->gpio_count = SUNXI_GPIOS_PER_BANK;
	uc_priv->bank_name = plat->bank_name;
	}

	return 0;
	}

	U_BOOT_DRIVER(gpio_sunxi) = {
	.name = "gpio_sunxi",
	.id = UCLASS_GPIO,
	.probe = gpio_sunxi_probe,
	.ops = &gpio_sunxi_ops,
	};
	#endif /* DM_GPIO */