drivers/gpio/intel_ich6_gpio.c - platform/external/u-boot - Gitiles

 /*
  * Copyright (c) 2012 The Chromium OS Authors.
  * SPDX-License-Identifier:	GPL-2.0+
  */

 /*
  * This is a GPIO driver for Intel ICH6 and later. The x86 GPIOs are accessed
  * through the PCI bus. Each PCI device has 256 bytes of configuration space,
  * consisting of a standard header and a device-specific set of registers. PCI
  * bus 0, device 31, function 0 gives us access to the chipset GPIOs (among
  * other things). Within the PCI configuration space, the GPIOBASE register
  * tells us where in the device's I/O region we can find more registers to
  * actually access the GPIOs.
  *
  * PCI bus/device/function 0:1f:0  => PCI config registers
  *   PCI config register "GPIOBASE"
  *     PCI I/O space + [GPIOBASE]  => start of GPIO registers
  *       GPIO registers => gpio pin function, direction, value
  *
  *
  * Danger Will Robinson! Bank 0 (GPIOs 0-31) seems to be fairly stable. Most
  * ICH versions have more, but the decoding the matrix that describes them is
  * absurdly complex and constantly changing. We'll provide Bank 1 and Bank 2,
  * but they will ONLY work for certain unspecified chipsets because the offset
  * from GPIOBASE changes randomly. Even then, many GPIOs are unimplemented or
  * reserved or subject to arcane restrictions.
  */

 #include <common.h>
 #include <dm.h>
 #include <errno.h>
 #include <fdtdec.h>
 #include <pch.h>
 #include <pci.h>
 #include <asm/gpio.h>
 #include <asm/io.h>
 #include <asm/pci.h>

 DECLARE_GLOBAL_DATA_PTR;

 #define GPIO_PER_BANK	32

 struct ich6_bank_priv {
 	/* These are I/O addresses */
 	uint16_t use_sel;
 	uint16_t io_sel;
 	uint16_t lvl;
 };

 #define GPIO_USESEL_OFFSET(x)	(x)
 #define GPIO_IOSEL_OFFSET(x)	(x + 4)
 #define GPIO_LVL_OFFSET(x)	(x + 8)

 #define IOPAD_MODE_MASK				0x7
 #define IOPAD_PULL_ASSIGN_SHIFT		7
 #define IOPAD_PULL_ASSIGN_MASK		(0x3 << IOPAD_PULL_ASSIGN_SHIFT)
 #define IOPAD_PULL_STRENGTH_SHIFT	9
 #define IOPAD_PULL_STRENGTH_MASK	(0x3 << IOPAD_PULL_STRENGTH_SHIFT)

 /* TODO: Move this to device tree, or platform data */
 void ich_gpio_set_gpio_map(const struct pch_gpio_map *map)
 {
 	gd->arch.gpio_map = map;
 }

 static int _ich6_gpio_set_value(uint16_t base, unsigned offset, int value)
 {
 	u32 val;

 	val = inl(base);
 	if (value)
 		val |= (1UL << offset);
 	else
 		val &= ~(1UL << offset);
 	outl(val, base);

 	return 0;
 }

 static int _ich6_gpio_set_function(uint16_t base, unsigned offset, int func)
 {
 	u32 val;

 	if (func) {
 		val = inl(base);
 		val |= (1UL << offset);
 		outl(val, base);
 	} else {
 		val = inl(base);
 		val &= ~(1UL << offset);
 		outl(val, base);
 	}

 	return 0;
 }

 static int _ich6_gpio_set_direction(uint16_t base, unsigned offset, int dir)
 {
 	u32 val;

 	if (!dir) {
 		val = inl(base);
 		val |= (1UL << offset);
 		outl(val, base);
 	} else {
 		val = inl(base);
 		val &= ~(1UL << offset);
 		outl(val, base);
 	}

 	return 0;
 }

 static int _gpio_ich6_pinctrl_cfg_pin(s32 gpiobase, s32 iobase, int pin_node)
 {
 	u32 gpio_offset[2];
 	int pad_offset;
 	int val;
 	int ret;
 	const void *prop;

 	/*
 	 * GPIO node is not mandatory, so we only do the
 	 * pinmuxing if the node exist.
 	 */
 	ret = fdtdec_get_int_array(gd->fdt_blob, pin_node, "gpio-offset",
 			     gpio_offset, 2);
 	if (!ret) {
 		/* Do we want to force the GPIO mode? */
 		prop = fdt_getprop(gd->fdt_blob, pin_node, "mode-gpio",
 				      NULL);
 		if (prop)
 			_ich6_gpio_set_function(GPIO_USESEL_OFFSET
 						(gpiobase) +
 						gpio_offset[0],
 						gpio_offset[1], 1);

 		val =
 		    fdtdec_get_int(gd->fdt_blob, pin_node, "direction", -1);
 		if (val != -1)
 			_ich6_gpio_set_direction(GPIO_IOSEL_OFFSET
 						 (gpiobase) +
 						 gpio_offset[0],
 						 gpio_offset[1], val);

 		val =
 		    fdtdec_get_int(gd->fdt_blob, pin_node, "output-value", -1);
 		if (val != -1)
 			_ich6_gpio_set_value(GPIO_LVL_OFFSET(gpiobase)
 					     + gpio_offset[0],
 					     gpio_offset[1], val);
 	}

 	/* if iobase is present, let's configure the pad */
 	if (iobase != -1) {
 		int iobase_addr;

 		/*
 		 * The offset for the same pin for the IOBASE and GPIOBASE are
 		 * different, so instead of maintaining a lookup table,
 		 * the device tree should provide directly the correct
 		 * value for both mapping.
 		 */
 		pad_offset =
 		    fdtdec_get_int(gd->fdt_blob, pin_node, "pad-offset", -1);
 		if (pad_offset == -1) {
 			debug("%s: Invalid register io offset %d\n",
 			      __func__, pad_offset);
 			return -EINVAL;
 		}

 		/* compute the absolute pad address */
 		iobase_addr = iobase + pad_offset;

 		/*
 		 * Do we need to set a specific function mode?
 		 * If someone put also 'mode-gpio', this option will
 		 * be just ignored by the controller
 		 */
 		val = fdtdec_get_int(gd->fdt_blob, pin_node, "mode-func", -1);
 		if (val != -1)
 			clrsetbits_le32(iobase_addr, IOPAD_MODE_MASK, val);

 		/* Configure the pull-up/down if needed */
 		val = fdtdec_get_int(gd->fdt_blob, pin_node, "pull-assign", -1);
 		if (val != -1)
 			clrsetbits_le32(iobase_addr,
 					IOPAD_PULL_ASSIGN_MASK,
 					val << IOPAD_PULL_ASSIGN_SHIFT);

 		val =
 		    fdtdec_get_int(gd->fdt_blob, pin_node, "pull-strength", -1);
 		if (val != -1)
 			clrsetbits_le32(iobase_addr,
 					IOPAD_PULL_STRENGTH_MASK,
 					val << IOPAD_PULL_STRENGTH_SHIFT);

 		debug("%s: pad cfg [0x%x]: %08x\n", __func__, pad_offset,
 		      readl(iobase_addr));
 	}

 	return 0;
 }

 int gpio_ich6_pinctrl_init(void)
 {
 	struct udevice *pch;
 	int pin_node;
 	int node;
 	int ret;
 	u32 gpiobase;
 	u32 iobase = -1;

 	ret = uclass_first_device(UCLASS_PCH, &pch);
 	if (ret)
 		return ret;
 	if (!pch)
 		return -ENODEV;

 	/*
 	 * Get the memory/io base address to configure every pins.
 	 * IOBASE is used to configure the mode/pads
 	 * GPIOBASE is used to configure the direction and default value
 	 */
 	ret = pch_get_gpio_base(pch, &gpiobase);
 	if (ret) {
 		debug("%s: invalid GPIOBASE address (%08x)\n", __func__,
 		      gpiobase);
 		return -EINVAL;
 	}

 	/* This is not an error to not have a pinctrl node */
 	node =
 	    fdtdec_next_compatible(gd->fdt_blob, 0, COMPAT_INTEL_X86_PINCTRL);
 	if (node <= 0) {
 		debug("%s: no pinctrl node\n", __func__);
 		return 0;
 	}

 	/*
 	 * Get the IOBASE, this is not mandatory as this is not
 	 * supported by all the CPU
 	 */
 	ret = pch_get_io_base(pch, &iobase);
 	if (ret && ret != -ENOSYS) {
 		debug("%s: invalid IOBASE address (%08x)\n", __func__,
 		      iobase);
 		return -EINVAL;
 	}

 	for (pin_node = fdt_first_subnode(gd->fdt_blob, node);
 	     pin_node > 0;
 	     pin_node = fdt_next_subnode(gd->fdt_blob, pin_node)) {
 		/* Configure the pin */
 		ret = _gpio_ich6_pinctrl_cfg_pin(gpiobase, iobase, pin_node);
 		if (ret != 0) {
 			debug("%s: invalid configuration for the pin %d\n",
 			      __func__, pin_node);
 			return ret;
 		}
 	}

 	return 0;
 }

 static int gpio_ich6_ofdata_to_platdata(struct udevice *dev)
 {
 	struct ich6_bank_platdata *plat = dev_get_platdata(dev);
 	u32 gpiobase;
 	int offset;
 	int ret;

 	ret = pch_get_gpio_base(dev->parent, &gpiobase);
 	if (ret)
 		return ret;

 	offset = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "reg", -1);
 	if (offset == -1) {
 		debug("%s: Invalid register offset %d\n", __func__, offset);
 		return -EINVAL;
 	}
 	plat->base_addr = gpiobase + offset;
 	plat->bank_name = fdt_getprop(gd->fdt_blob, dev->of_offset,
 				      "bank-name", NULL);

 	return 0;
 }

 static int ich6_gpio_probe(struct udevice *dev)
 {
 	struct ich6_bank_platdata *plat = dev_get_platdata(dev);
 	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
 	struct ich6_bank_priv *bank = dev_get_priv(dev);

 	if (gd->arch.gpio_map) {
 		setup_pch_gpios(plat->base_addr, gd->arch.gpio_map);
 		gd->arch.gpio_map = NULL;
 	}

 	uc_priv->gpio_count = GPIO_PER_BANK;
 	uc_priv->bank_name = plat->bank_name;
 	bank->use_sel = plat->base_addr;
 	bank->io_sel = plat->base_addr + 4;
 	bank->lvl = plat->base_addr + 8;

 	return 0;
 }

 static int ich6_gpio_request(struct udevice *dev, unsigned offset,
 			     const char *label)
 {
 	struct ich6_bank_priv *bank = dev_get_priv(dev);
 	u32 tmplong;

 	/*
 	 * Make sure that the GPIO pin we want isn't already in use for some
 	 * built-in hardware function. We have to check this for every
 	 * requested pin.
 	 */
 	tmplong = inl(bank->use_sel);
 	if (!(tmplong & (1UL << offset))) {
 		debug("%s: gpio %d is reserved for internal use\n", __func__,
 		      offset);
 		return -EPERM;
 	}

 	return 0;
 }

 static int ich6_gpio_direction_input(struct udevice *dev, unsigned offset)
 {
 	struct ich6_bank_priv *bank = dev_get_priv(dev);

 	return _ich6_gpio_set_direction(bank->io_sel, offset, 0);
 }

 static int ich6_gpio_direction_output(struct udevice *dev, unsigned offset,
 				       int value)
 {
 	int ret;
 	struct ich6_bank_priv *bank = dev_get_priv(dev);

 	ret = _ich6_gpio_set_direction(bank->io_sel, offset, 1);
 	if (ret)
 		return ret;

 	return _ich6_gpio_set_value(bank->lvl, offset, value);
 }

 static int ich6_gpio_get_value(struct udevice *dev, unsigned offset)
 {
 	struct ich6_bank_priv *bank = dev_get_priv(dev);
 	u32 tmplong;
 	int r;

 	tmplong = inl(bank->lvl);
 	r = (tmplong & (1UL << offset)) ? 1 : 0;
 	return r;
 }

 static int ich6_gpio_set_value(struct udevice *dev, unsigned offset,
 			       int value)
 {
 	struct ich6_bank_priv *bank = dev_get_priv(dev);
 	return _ich6_gpio_set_value(bank->lvl, offset, value);
 }

 static int ich6_gpio_get_function(struct udevice *dev, unsigned offset)
 {
 	struct ich6_bank_priv *bank = dev_get_priv(dev);
 	u32 mask = 1UL << offset;

 	if (!(inl(bank->use_sel) & mask))
 		return GPIOF_FUNC;
 	if (inl(bank->io_sel) & mask)
 		return GPIOF_INPUT;
 	else
 		return GPIOF_OUTPUT;
 }

 static const struct dm_gpio_ops gpio_ich6_ops = {
 	.request		= ich6_gpio_request,
 	.direction_input	= ich6_gpio_direction_input,
 	.direction_output	= ich6_gpio_direction_output,
 	.get_value		= ich6_gpio_get_value,
 	.set_value		= ich6_gpio_set_value,
 	.get_function		= ich6_gpio_get_function,
 };

 static const struct udevice_id intel_ich6_gpio_ids[] = {
 	{ .compatible = "intel,ich6-gpio" },
 	{ }
 };

 U_BOOT_DRIVER(gpio_ich6) = {
 	.name	= "gpio_ich6",
 	.id	= UCLASS_GPIO,
 	.of_match = intel_ich6_gpio_ids,
 	.ops	= &gpio_ich6_ops,
 	.ofdata_to_platdata	= gpio_ich6_ofdata_to_platdata,
 	.probe	= ich6_gpio_probe,
 	.priv_auto_alloc_size = sizeof(struct ich6_bank_priv),
 	.platdata_auto_alloc_size = sizeof(struct ich6_bank_platdata),
 };
	/*
	* Copyright (c) 2012 The Chromium OS Authors.
	* SPDX-License-Identifier: GPL-2.0+
	*/

	/*
	* This is a GPIO driver for Intel ICH6 and later. The x86 GPIOs are accessed
	* through the PCI bus. Each PCI device has 256 bytes of configuration space,
	* consisting of a standard header and a device-specific set of registers. PCI
	* bus 0, device 31, function 0 gives us access to the chipset GPIOs (among
	* other things). Within the PCI configuration space, the GPIOBASE register
	* tells us where in the device's I/O region we can find more registers to
	* actually access the GPIOs.
	*
	* PCI bus/device/function 0:1f:0 => PCI config registers
	* PCI config register "GPIOBASE"
	* PCI I/O space + [GPIOBASE] => start of GPIO registers
	* GPIO registers => gpio pin function, direction, value
	*
	*
	* Danger Will Robinson! Bank 0 (GPIOs 0-31) seems to be fairly stable. Most
	* ICH versions have more, but the decoding the matrix that describes them is
	* absurdly complex and constantly changing. We'll provide Bank 1 and Bank 2,
	* but they will ONLY work for certain unspecified chipsets because the offset
	* from GPIOBASE changes randomly. Even then, many GPIOs are unimplemented or
	* reserved or subject to arcane restrictions.
	*/

	#include <common.h>
	#include <dm.h>
	#include <errno.h>
	#include <fdtdec.h>
	#include <pch.h>
	#include <pci.h>
	#include <asm/gpio.h>
	#include <asm/io.h>
	#include <asm/pci.h>

	DECLARE_GLOBAL_DATA_PTR;

	#define GPIO_PER_BANK 32

	struct ich6_bank_priv {
	/* These are I/O addresses */
	uint16_t use_sel;
	uint16_t io_sel;
	uint16_t lvl;
	};

	#define GPIO_USESEL_OFFSET(x) (x)
	#define GPIO_IOSEL_OFFSET(x) (x + 4)
	#define GPIO_LVL_OFFSET(x) (x + 8)

	#define IOPAD_MODE_MASK 0x7
	#define IOPAD_PULL_ASSIGN_SHIFT 7
	#define IOPAD_PULL_ASSIGN_MASK (0x3 << IOPAD_PULL_ASSIGN_SHIFT)
	#define IOPAD_PULL_STRENGTH_SHIFT 9
	#define IOPAD_PULL_STRENGTH_MASK (0x3 << IOPAD_PULL_STRENGTH_SHIFT)

	/* TODO: Move this to device tree, or platform data */
	void ich_gpio_set_gpio_map(const struct pch_gpio_map *map)
	{
	gd->arch.gpio_map = map;
	}

	static int _ich6_gpio_set_value(uint16_t base, unsigned offset, int value)
	{
	u32 val;

	val = inl(base);
	if (value)
	val \|= (1UL << offset);
	else
	val &= ~(1UL << offset);
	outl(val, base);

	return 0;
	}

	static int _ich6_gpio_set_function(uint16_t base, unsigned offset, int func)
	{
	u32 val;

	if (func) {
	val = inl(base);
	val \|= (1UL << offset);
	outl(val, base);
	} else {
	val = inl(base);
	val &= ~(1UL << offset);
	outl(val, base);
	}

	return 0;
	}

	static int _ich6_gpio_set_direction(uint16_t base, unsigned offset, int dir)
	{
	u32 val;

	if (!dir) {
	val = inl(base);
	val \|= (1UL << offset);
	outl(val, base);
	} else {
	val = inl(base);
	val &= ~(1UL << offset);
	outl(val, base);
	}

	return 0;
	}

	static int _gpio_ich6_pinctrl_cfg_pin(s32 gpiobase, s32 iobase, int pin_node)
	{
	u32 gpio_offset[2];
	int pad_offset;
	int val;
	int ret;
	const void *prop;

	/*
	* GPIO node is not mandatory, so we only do the
	* pinmuxing if the node exist.
	*/
	ret = fdtdec_get_int_array(gd->fdt_blob, pin_node, "gpio-offset",
	gpio_offset, 2);
	if (!ret) {
	/* Do we want to force the GPIO mode? */
	prop = fdt_getprop(gd->fdt_blob, pin_node, "mode-gpio",
	NULL);
	if (prop)
	_ich6_gpio_set_function(GPIO_USESEL_OFFSET
	(gpiobase) +
	gpio_offset[0],
	gpio_offset[1], 1);

	val =
	fdtdec_get_int(gd->fdt_blob, pin_node, "direction", -1);
	if (val != -1)
	_ich6_gpio_set_direction(GPIO_IOSEL_OFFSET
	(gpiobase) +
	gpio_offset[0],
	gpio_offset[1], val);

	val =
	fdtdec_get_int(gd->fdt_blob, pin_node, "output-value", -1);
	if (val != -1)
	_ich6_gpio_set_value(GPIO_LVL_OFFSET(gpiobase)
	+ gpio_offset[0],
	gpio_offset[1], val);
	}

	/* if iobase is present, let's configure the pad */
	if (iobase != -1) {
	int iobase_addr;

	/*
	* The offset for the same pin for the IOBASE and GPIOBASE are
	* different, so instead of maintaining a lookup table,
	* the device tree should provide directly the correct
	* value for both mapping.
	*/
	pad_offset =
	fdtdec_get_int(gd->fdt_blob, pin_node, "pad-offset", -1);
	if (pad_offset == -1) {
	debug("%s: Invalid register io offset %d\n",
	__func__, pad_offset);
	return -EINVAL;
	}

	/* compute the absolute pad address */
	iobase_addr = iobase + pad_offset;

	/*
	* Do we need to set a specific function mode?
	* If someone put also 'mode-gpio', this option will
	* be just ignored by the controller
	*/
	val = fdtdec_get_int(gd->fdt_blob, pin_node, "mode-func", -1);
	if (val != -1)
	clrsetbits_le32(iobase_addr, IOPAD_MODE_MASK, val);

	/* Configure the pull-up/down if needed */
	val = fdtdec_get_int(gd->fdt_blob, pin_node, "pull-assign", -1);
	if (val != -1)
	clrsetbits_le32(iobase_addr,
	IOPAD_PULL_ASSIGN_MASK,
	val << IOPAD_PULL_ASSIGN_SHIFT);

	val =
	fdtdec_get_int(gd->fdt_blob, pin_node, "pull-strength", -1);
	if (val != -1)
	clrsetbits_le32(iobase_addr,
	IOPAD_PULL_STRENGTH_MASK,
	val << IOPAD_PULL_STRENGTH_SHIFT);

	debug("%s: pad cfg [0x%x]: %08x\n", __func__, pad_offset,
	readl(iobase_addr));
	}

	return 0;
	}

	int gpio_ich6_pinctrl_init(void)
	{
	struct udevice *pch;
	int pin_node;
	int node;
	int ret;
	u32 gpiobase;
	u32 iobase = -1;

	ret = uclass_first_device(UCLASS_PCH, &pch);
	if (ret)
	return ret;
	if (!pch)
	return -ENODEV;

	/*
	* Get the memory/io base address to configure every pins.
	* IOBASE is used to configure the mode/pads
	* GPIOBASE is used to configure the direction and default value
	*/
	ret = pch_get_gpio_base(pch, &gpiobase);
	if (ret) {
	debug("%s: invalid GPIOBASE address (%08x)\n", __func__,
	gpiobase);
	return -EINVAL;
	}

	/* This is not an error to not have a pinctrl node */
	node =
	fdtdec_next_compatible(gd->fdt_blob, 0, COMPAT_INTEL_X86_PINCTRL);
	if (node <= 0) {
	debug("%s: no pinctrl node\n", __func__);
	return 0;
	}

	/*
	* Get the IOBASE, this is not mandatory as this is not
	* supported by all the CPU
	*/
	ret = pch_get_io_base(pch, &iobase);
	if (ret && ret != -ENOSYS) {
	debug("%s: invalid IOBASE address (%08x)\n", __func__,
	iobase);
	return -EINVAL;
	}

	for (pin_node = fdt_first_subnode(gd->fdt_blob, node);
	pin_node > 0;
	pin_node = fdt_next_subnode(gd->fdt_blob, pin_node)) {
	/* Configure the pin */
	ret = _gpio_ich6_pinctrl_cfg_pin(gpiobase, iobase, pin_node);
	if (ret != 0) {
	debug("%s: invalid configuration for the pin %d\n",
	__func__, pin_node);
	return ret;
	}
	}

	return 0;
	}

	static int gpio_ich6_ofdata_to_platdata(struct udevice *dev)
	{
	struct ich6_bank_platdata *plat = dev_get_platdata(dev);
	u32 gpiobase;
	int offset;
	int ret;

	ret = pch_get_gpio_base(dev->parent, &gpiobase);
	if (ret)
	return ret;

	offset = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "reg", -1);
	if (offset == -1) {
	debug("%s: Invalid register offset %d\n", __func__, offset);
	return -EINVAL;
	}
	plat->base_addr = gpiobase + offset;
	plat->bank_name = fdt_getprop(gd->fdt_blob, dev->of_offset,
	"bank-name", NULL);

	return 0;
	}

	static int ich6_gpio_probe(struct udevice *dev)
	{
	struct ich6_bank_platdata *plat = dev_get_platdata(dev);
	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
	struct ich6_bank_priv *bank = dev_get_priv(dev);

	if (gd->arch.gpio_map) {
	setup_pch_gpios(plat->base_addr, gd->arch.gpio_map);
	gd->arch.gpio_map = NULL;
	}

	uc_priv->gpio_count = GPIO_PER_BANK;
	uc_priv->bank_name = plat->bank_name;
	bank->use_sel = plat->base_addr;
	bank->io_sel = plat->base_addr + 4;
	bank->lvl = plat->base_addr + 8;

	return 0;
	}

	static int ich6_gpio_request(struct udevice *dev, unsigned offset,
	const char *label)
	{
	struct ich6_bank_priv *bank = dev_get_priv(dev);
	u32 tmplong;

	/*
	* Make sure that the GPIO pin we want isn't already in use for some
	* built-in hardware function. We have to check this for every
	* requested pin.
	*/
	tmplong = inl(bank->use_sel);
	if (!(tmplong & (1UL << offset))) {
	debug("%s: gpio %d is reserved for internal use\n", __func__,
	offset);
	return -EPERM;
	}

	return 0;
	}

	static int ich6_gpio_direction_input(struct udevice *dev, unsigned offset)
	{
	struct ich6_bank_priv *bank = dev_get_priv(dev);

	return _ich6_gpio_set_direction(bank->io_sel, offset, 0);
	}

	static int ich6_gpio_direction_output(struct udevice *dev, unsigned offset,
	int value)
	{
	int ret;
	struct ich6_bank_priv *bank = dev_get_priv(dev);

	ret = _ich6_gpio_set_direction(bank->io_sel, offset, 1);
	if (ret)
	return ret;

	return _ich6_gpio_set_value(bank->lvl, offset, value);
	}

	static int ich6_gpio_get_value(struct udevice *dev, unsigned offset)
	{
	struct ich6_bank_priv *bank = dev_get_priv(dev);
	u32 tmplong;
	int r;

	tmplong = inl(bank->lvl);
	r = (tmplong & (1UL << offset)) ? 1 : 0;
	return r;
	}

	static int ich6_gpio_set_value(struct udevice *dev, unsigned offset,
	int value)
	{
	struct ich6_bank_priv *bank = dev_get_priv(dev);
	return _ich6_gpio_set_value(bank->lvl, offset, value);
	}

	static int ich6_gpio_get_function(struct udevice *dev, unsigned offset)
	{
	struct ich6_bank_priv *bank = dev_get_priv(dev);
	u32 mask = 1UL << offset;

	if (!(inl(bank->use_sel) & mask))
	return GPIOF_FUNC;
	if (inl(bank->io_sel) & mask)
	return GPIOF_INPUT;
	else
	return GPIOF_OUTPUT;
	}

	static const struct dm_gpio_ops gpio_ich6_ops = {
	.request = ich6_gpio_request,
	.direction_input = ich6_gpio_direction_input,
	.direction_output = ich6_gpio_direction_output,
	.get_value = ich6_gpio_get_value,
	.set_value = ich6_gpio_set_value,
	.get_function = ich6_gpio_get_function,
	};

	static const struct udevice_id intel_ich6_gpio_ids[] = {
	{ .compatible = "intel,ich6-gpio" },
	{ }
	};

	U_BOOT_DRIVER(gpio_ich6) = {
	.name = "gpio_ich6",
	.id = UCLASS_GPIO,
	.of_match = intel_ich6_gpio_ids,
	.ops = &gpio_ich6_ops,
	.ofdata_to_platdata = gpio_ich6_ofdata_to_platdata,
	.probe = ich6_gpio_probe,
	.priv_auto_alloc_size = sizeof(struct ich6_bank_priv),
	.platdata_auto_alloc_size = sizeof(struct ich6_bank_platdata),
	};