pinctrl-baytrail.c

/*
 * Pinctrl GPIO driver for Intel Baytrail
 * Copyright (c) 2012-2013, Intel Corporation.
 *
 * Author: Mathias Nyman <mathias.nyman@linux.intel.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/interrupt.h>
#include <linux/gpio/driver.h>
#include <linux/acpi.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/io.h>
#include <linux/pm_runtime.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>

/* memory mapped register offsets */
#define BYT_CONF0_REG		0x000
#define BYT_CONF1_REG		0x004
#define BYT_VAL_REG		0x008
#define BYT_DFT_REG		0x00c
#define BYT_INT_STAT_REG	0x800

/* BYT_CONF0_REG register bits */
#define BYT_IODEN		BIT(31)
#define BYT_DIRECT_IRQ_EN	BIT(27)
#define BYT_TRIG_NEG		BIT(26)
#define BYT_TRIG_POS		BIT(25)
#define BYT_TRIG_LVL		BIT(24)
#define BYT_PULL_STR_SHIFT	9
#define BYT_PULL_STR_MASK	(3 << BYT_PULL_STR_SHIFT)
#define BYT_PULL_STR_2K		(0 << BYT_PULL_STR_SHIFT)
#define BYT_PULL_STR_10K	(1 << BYT_PULL_STR_SHIFT)
#define BYT_PULL_STR_20K	(2 << BYT_PULL_STR_SHIFT)
#define BYT_PULL_STR_40K	(3 << BYT_PULL_STR_SHIFT)
#define BYT_PULL_ASSIGN_SHIFT	7
#define BYT_PULL_ASSIGN_MASK	(3 << BYT_PULL_ASSIGN_SHIFT)
#define BYT_PULL_ASSIGN_UP	(1 << BYT_PULL_ASSIGN_SHIFT)
#define BYT_PULL_ASSIGN_DOWN	(2 << BYT_PULL_ASSIGN_SHIFT)
#define BYT_PIN_MUX		0x07

/* BYT_VAL_REG register bits */
#define BYT_INPUT_EN		BIT(2)  /* 0: input enabled (active low)*/
#define BYT_OUTPUT_EN		BIT(1)  /* 0: output enabled (active low)*/
#define BYT_LEVEL		BIT(0)

#define BYT_DIR_MASK		(BIT(1) | BIT(2))
#define BYT_TRIG_MASK		(BIT(26) | BIT(25) | BIT(24))

#define BYT_CONF0_RESTORE_MASK	(BYT_DIRECT_IRQ_EN | BYT_TRIG_MASK | \
				 BYT_PIN_MUX)
#define BYT_VAL_RESTORE_MASK	(BYT_DIR_MASK | BYT_LEVEL)

#define BYT_NGPIO_SCORE		102
#define BYT_NGPIO_NCORE		28
#define BYT_NGPIO_SUS		44

#define BYT_SCORE_ACPI_UID	"1"
#define BYT_NCORE_ACPI_UID	"2"
#define BYT_SUS_ACPI_UID	"3"

/*
 * This is the function value most pins have for GPIO muxing. If the value
 * differs from the default one, it must be explicitly mentioned. Otherwise, the
 * pin control implementation will set the muxing value to default GPIO if it
 * does not find a match for the requested function.
 */
#define BYT_DEFAULT_GPIO_MUX	0

struct byt_gpio_pin_context {
	u32 conf0;
	u32 val;
};

struct byt_simple_func_mux {
	const char *name;
	unsigned short func;
};

struct byt_mixed_func_mux {
	const char *name;
	const unsigned short *func_values;
};

struct byt_pingroup {
	const char *name;
	const unsigned int *pins;
	size_t npins;
	unsigned short has_simple_funcs;
	union {
		const struct byt_simple_func_mux *simple_funcs;
		const struct byt_mixed_func_mux *mixed_funcs;
	};
	size_t nfuncs;
};

struct byt_function {
	const char *name;
	const char * const *groups;
	size_t ngroups;
};

struct byt_community {
	unsigned int pin_base;
	size_t npins;
	const unsigned int *pad_map;
	void __iomem *reg_base;
};

#define SIMPLE_FUNC(n, f)	\
	{			\
		.name	= (n),	\
		.func	= (f),	\
	}
#define MIXED_FUNC(n, f)		\
	{				\
		.name		= (n),	\
		.func_values	= (f),	\
	}

#define PIN_GROUP_SIMPLE(n, p, f)				\
	{							\
		.name			= (n),			\
		.pins			= (p),			\
		.npins			= ARRAY_SIZE((p)),	\
		.has_simple_funcs	= 1,		\
		.simple_funcs		= (f),			\
		.nfuncs			= ARRAY_SIZE((f)),	\
	}
#define PIN_GROUP_MIXED(n, p, f)				\
	{							\
		.name			= (n),			\
		.pins			= (p),			\
		.npins			= ARRAY_SIZE((p)),	\
		.has_simple_funcs	= 0,			\
		.mixed_funcs		= (f),			\
		.nfuncs			= ARRAY_SIZE((f)),	\
	}

#define FUNCTION(n, g)					\
	{						\
		.name		= (n),			\
		.groups		= (g),			\
		.ngroups	= ARRAY_SIZE((g)),	\
	}

#define COMMUNITY(p, n, map)		\
	{				\
		.pin_base	= (p),	\
		.npins		= (n),	\
		.pad_map	= (map),\
	}

struct byt_pinctrl_soc_data {
	const char *uid;
	const struct pinctrl_pin_desc *pins;
	size_t npins;
	const struct byt_pingroup *groups;
	size_t ngroups;
	const struct byt_function *functions;
	size_t nfunctions;
	const struct byt_community *communities;
	size_t ncommunities;
};

/* SCORE pins, aka GPIOC_<pin_no> or GPIO_S0_SC[<pin_no>] */
static const struct pinctrl_pin_desc byt_score_pins[] = {
	PINCTRL_PIN(0, "SATA_GP0"),
	PINCTRL_PIN(1, "SATA_GP1"),
	PINCTRL_PIN(2, "SATA_LED#"),
	PINCTRL_PIN(3, "PCIE_CLKREQ0"),
	PINCTRL_PIN(4, "PCIE_CLKREQ1"),
	PINCTRL_PIN(5, "PCIE_CLKREQ2"),
	PINCTRL_PIN(6, "PCIE_CLKREQ3"),
	PINCTRL_PIN(7, "SD3_WP"),
	PINCTRL_PIN(8, "HDA_RST"),
	PINCTRL_PIN(9, "HDA_SYNC"),
	PINCTRL_PIN(10, "HDA_CLK"),
	PINCTRL_PIN(11, "HDA_SDO"),
	PINCTRL_PIN(12, "HDA_SDI0"),
	PINCTRL_PIN(13, "HDA_SDI1"),
	PINCTRL_PIN(14, "GPIO_S0_SC14"),
	PINCTRL_PIN(15, "GPIO_S0_SC15"),
	PINCTRL_PIN(16, "MMC1_CLK"),
	PINCTRL_PIN(17, "MMC1_D0"),
	PINCTRL_PIN(18, "MMC1_D1"),
	PINCTRL_PIN(19, "MMC1_D2"),
	PINCTRL_PIN(20, "MMC1_D3"),
	PINCTRL_PIN(21, "MMC1_D4"),
	PINCTRL_PIN(22, "MMC1_D5"),
	PINCTRL_PIN(23, "MMC1_D6"),
	PINCTRL_PIN(24, "MMC1_D7"),
	PINCTRL_PIN(25, "MMC1_CMD"),
	PINCTRL_PIN(26, "MMC1_RST"),
	PINCTRL_PIN(27, "SD2_CLK"),
	PINCTRL_PIN(28, "SD2_D0"),
	PINCTRL_PIN(29, "SD2_D1"),
	PINCTRL_PIN(30, "SD2_D2"),
	PINCTRL_PIN(31, "SD2_D3_CD"),
	PINCTRL_PIN(32, "SD2_CMD"),
	PINCTRL_PIN(33, "SD3_CLK"),
	PINCTRL_PIN(34, "SD3_D0"),
	PINCTRL_PIN(35, "SD3_D1"),
	PINCTRL_PIN(36, "SD3_D2"),
	PINCTRL_PIN(37, "SD3_D3"),
	PINCTRL_PIN(38, "SD3_CD"),
	PINCTRL_PIN(39, "SD3_CMD"),
	PINCTRL_PIN(40, "SD3_1P8EN"),
	PINCTRL_PIN(41, "SD3_PWREN#"),
	PINCTRL_PIN(42, "ILB_LPC_AD0"),
	PINCTRL_PIN(43, "ILB_LPC_AD1"),
	PINCTRL_PIN(44, "ILB_LPC_AD2"),
	PINCTRL_PIN(45, "ILB_LPC_AD3"),
	PINCTRL_PIN(46, "ILB_LPC_FRAME"),
	PINCTRL_PIN(47, "ILB_LPC_CLK0"),
	PINCTRL_PIN(48, "ILB_LPC_CLK1"),
	PINCTRL_PIN(49, "ILB_LPC_CLKRUN"),
	PINCTRL_PIN(50, "ILB_LPC_SERIRQ"),
	PINCTRL_PIN(51, "PCU_SMB_DATA"),
	PINCTRL_PIN(52, "PCU_SMB_CLK"),
	PINCTRL_PIN(53, "PCU_SMB_ALERT"),
	PINCTRL_PIN(54, "ILB_8254_SPKR"),
	PINCTRL_PIN(55, "GPIO_S0_SC55"),
	PINCTRL_PIN(56, "GPIO_S0_SC56"),
	PINCTRL_PIN(57, "GPIO_S0_SC57"),
	PINCTRL_PIN(58, "GPIO_S0_SC58"),
	PINCTRL_PIN(59, "GPIO_S0_SC59"),
	PINCTRL_PIN(60, "GPIO_S0_SC60"),
	PINCTRL_PIN(61, "GPIO_S0_SC61"),
	PINCTRL_PIN(62, "LPE_I2S2_CLK"),
	PINCTRL_PIN(63, "LPE_I2S2_FRM"),
	PINCTRL_PIN(64, "LPE_I2S2_DATAIN"),
	PINCTRL_PIN(65, "LPE_I2S2_DATAOUT"),
	PINCTRL_PIN(66, "SIO_SPI_CS"),
	PINCTRL_PIN(67, "SIO_SPI_MISO"),
	PINCTRL_PIN(68, "SIO_SPI_MOSI"),
	PINCTRL_PIN(69, "SIO_SPI_CLK"),
	PINCTRL_PIN(70, "SIO_UART1_RXD"),
	PINCTRL_PIN(71, "SIO_UART1_TXD"),
	PINCTRL_PIN(72, "SIO_UART1_RTS"),
	PINCTRL_PIN(73, "SIO_UART1_CTS"),
	PINCTRL_PIN(74, "SIO_UART2_RXD"),
	PINCTRL_PIN(75, "SIO_UART2_TXD"),
	PINCTRL_PIN(76, "SIO_UART2_RTS"),
	PINCTRL_PIN(77, "SIO_UART2_CTS"),
	PINCTRL_PIN(78, "SIO_I2C0_DATA"),
	PINCTRL_PIN(79, "SIO_I2C0_CLK"),
	PINCTRL_PIN(80, "SIO_I2C1_DATA"),
	PINCTRL_PIN(81, "SIO_I2C1_CLK"),
	PINCTRL_PIN(82, "SIO_I2C2_DATA"),
	PINCTRL_PIN(83, "SIO_I2C2_CLK"),
	PINCTRL_PIN(84, "SIO_I2C3_DATA"),
	PINCTRL_PIN(85, "SIO_I2C3_CLK"),
	PINCTRL_PIN(86, "SIO_I2C4_DATA"),
	PINCTRL_PIN(87, "SIO_I2C4_CLK"),
	PINCTRL_PIN(88, "SIO_I2C5_DATA"),
	PINCTRL_PIN(89, "SIO_I2C5_CLK"),
	PINCTRL_PIN(90, "SIO_I2C6_DATA"),
	PINCTRL_PIN(91, "SIO_I2C6_CLK"),
	PINCTRL_PIN(92, "GPIO_S0_SC92"),
	PINCTRL_PIN(93, "GPIO_S0_SC93"),
	PINCTRL_PIN(94, "SIO_PWM0"),
	PINCTRL_PIN(95, "SIO_PWM1"),
	PINCTRL_PIN(96, "PMC_PLT_CLK0"),
	PINCTRL_PIN(97, "PMC_PLT_CLK1"),
	PINCTRL_PIN(98, "PMC_PLT_CLK2"),
	PINCTRL_PIN(99, "PMC_PLT_CLK3"),
	PINCTRL_PIN(100, "PMC_PLT_CLK4"),
	PINCTRL_PIN(101, "PMC_PLT_CLK5"),
};

static unsigned const score_pins[BYT_NGPIO_SCORE] = {
	85, 89, 93, 96, 99, 102, 98, 101, 34, 37,
	36, 38, 39, 35, 40, 84, 62, 61, 64, 59,
	54, 56, 60, 55, 63, 57, 51, 50, 53, 47,
	52, 49, 48, 43, 46, 41, 45, 42, 58, 44,
	95, 105, 70, 68, 67, 66, 69, 71, 65, 72,
	86, 90, 88, 92, 103, 77, 79, 83, 78, 81,
	80, 82, 13, 12, 15, 14, 17, 18, 19, 16,
	2, 1, 0, 4, 6, 7, 9, 8, 33, 32,
	31, 30, 29, 27, 25, 28, 26, 23, 21, 20,
	24, 22, 5, 3, 10, 11, 106, 87, 91, 104,
	97, 100,
};

static const unsigned int byt_score_pins_map[BYT_NGPIO_SCORE] = {
	85, 89, 93, 96, 99, 102, 98, 101, 34, 37,
	36, 38, 39, 35, 40, 84, 62, 61, 64, 59,
	54, 56, 60, 55, 63, 57, 51, 50, 53, 47,
	52, 49, 48, 43, 46, 41, 45, 42, 58, 44,
	95, 105, 70, 68, 67, 66, 69, 71, 65, 72,
	86, 90, 88, 92, 103, 77, 79, 83, 78, 81,
	80, 82, 13, 12, 15, 14, 17, 18, 19, 16,
	2, 1, 0, 4, 6, 7, 9, 8, 33, 32,
	31, 30, 29, 27, 25, 28, 26, 23, 21, 20,
	24, 22, 5, 3, 10, 11, 106, 87, 91, 104,
	97, 100,
};

/* SCORE groups */
static const unsigned int byt_score_uart1_pins[] = { 70, 71, 72, 73 };
static const unsigned int byt_score_uart2_pins[] = { 74, 75, 76, 77 };
static const struct byt_simple_func_mux byt_score_uart_mux[] = {
	SIMPLE_FUNC("uart", 1),
};

static const unsigned int byt_score_pwm0_pins[] = { 94 };
static const unsigned int byt_score_pwm1_pins[] = { 95 };
static const struct byt_simple_func_mux byt_score_pwm_mux[] = {
	SIMPLE_FUNC("pwm", 1),
};

static const unsigned int byt_score_sio_spi_pins[] = { 66, 67, 68, 69 };
static const struct byt_simple_func_mux byt_score_spi_mux[] = {
	SIMPLE_FUNC("spi", 1),
};

static const unsigned int byt_score_i2c5_pins[] = { 88, 89 };
static const unsigned int byt_score_i2c6_pins[] = { 90, 91 };
static const unsigned int byt_score_i2c4_pins[] = { 86, 87 };
static const unsigned int byt_score_i2c3_pins[] = { 84, 85 };
static const unsigned int byt_score_i2c2_pins[] = { 82, 83 };
static const unsigned int byt_score_i2c1_pins[] = { 80, 81 };
static const unsigned int byt_score_i2c0_pins[] = { 78, 79 };
static const struct byt_simple_func_mux byt_score_i2c_mux[] = {
	SIMPLE_FUNC("i2c", 1),
};

static const unsigned int byt_score_ssp0_pins[] = { 8, 9, 10, 11 };
static const unsigned int byt_score_ssp1_pins[] = { 12, 13, 14, 15 };
static const unsigned int byt_score_ssp2_pins[] = { 62, 63, 64, 65 };
static const struct byt_simple_func_mux byt_score_ssp_mux[] = {
	SIMPLE_FUNC("ssp", 1),
};

static const unsigned int byt_score_sdcard_pins[] = {
	7, 33, 34, 35, 36, 37, 38, 39, 40, 41,
};
static const unsigned short byt_score_sdcard_mux_values[] = {
	2, 1, 1, 1, 1, 1, 1, 1, 1, 1,
};
static const struct byt_mixed_func_mux byt_score_sdcard_mux[] = {
	MIXED_FUNC("sdcard", byt_score_sdcard_mux_values),
};

static const unsigned int byt_score_sdio_pins[] = { 27, 28, 29, 30, 31, 32 };
static const struct byt_simple_func_mux byt_score_sdio_mux[] = {
	SIMPLE_FUNC("sdio", 1),
};

static const unsigned int byt_score_emmc_pins[] = {
	16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
};
static const struct byt_simple_func_mux byt_score_emmc_mux[] = {
	SIMPLE_FUNC("emmc", 1),
};

static const unsigned int byt_score_ilb_lpc_pins[] = {
	42, 43, 44, 45, 46, 47, 48, 49, 50,
};
static const struct byt_simple_func_mux byt_score_lpc_mux[] = {
	SIMPLE_FUNC("lpc", 1),
};

static const unsigned int byt_score_sata_pins[] = { 0, 1, 2 };
static const struct byt_simple_func_mux byt_score_sata_mux[] = {
	SIMPLE_FUNC("sata", 1),
};

static const unsigned int byt_score_plt_clk0_pins[] = { 96 };
static const unsigned int byt_score_plt_clk1_pins[] = { 97 };
static const unsigned int byt_score_plt_clk2_pins[] = { 98 };
static const unsigned int byt_score_plt_clk4_pins[] = { 99 };
static const unsigned int byt_score_plt_clk5_pins[] = { 100 };
static const unsigned int byt_score_plt_clk3_pins[] = { 101 };
static const struct byt_simple_func_mux byt_score_plt_clk_mux[] = {
	SIMPLE_FUNC("plt_clk", 1),
};

static const unsigned int byt_score_smbus_pins[] = { 51, 52, 53 };
static const struct byt_simple_func_mux byt_score_smbus_mux[] = {
	SIMPLE_FUNC("smbus", 1),
};

static const struct byt_pingroup byt_score_groups[] = {
	PIN_GROUP_SIMPLE("uart1_grp",
			 byt_score_uart1_pins, byt_score_uart_mux),
	PIN_GROUP_SIMPLE("uart2_grp",
			 byt_score_uart2_pins, byt_score_uart_mux),
	PIN_GROUP_SIMPLE("pwm0_grp",
			 byt_score_pwm0_pins, byt_score_pwm_mux),
	PIN_GROUP_SIMPLE("pwm1_grp",
			 byt_score_pwm1_pins, byt_score_pwm_mux),
	PIN_GROUP_SIMPLE("ssp2_grp",
			 byt_score_ssp2_pins, byt_score_pwm_mux),
	PIN_GROUP_SIMPLE("sio_spi_grp",
			 byt_score_sio_spi_pins, byt_score_spi_mux),
	PIN_GROUP_SIMPLE("i2c5_grp",
			 byt_score_i2c5_pins, byt_score_i2c_mux),
	PIN_GROUP_SIMPLE("i2c6_grp",
			 byt_score_i2c6_pins, byt_score_i2c_mux),
	PIN_GROUP_SIMPLE("i2c4_grp",
			 byt_score_i2c4_pins, byt_score_i2c_mux),
	PIN_GROUP_SIMPLE("i2c3_grp",
			 byt_score_i2c3_pins, byt_score_i2c_mux),
	PIN_GROUP_SIMPLE("i2c2_grp",
			 byt_score_i2c2_pins, byt_score_i2c_mux),
	PIN_GROUP_SIMPLE("i2c1_grp",
			 byt_score_i2c1_pins, byt_score_i2c_mux),
	PIN_GROUP_SIMPLE("i2c0_grp",
			 byt_score_i2c0_pins, byt_score_i2c_mux),
	PIN_GROUP_SIMPLE("ssp0_grp",
			 byt_score_ssp0_pins, byt_score_ssp_mux),
	PIN_GROUP_SIMPLE("ssp1_grp",
			 byt_score_ssp1_pins, byt_score_ssp_mux),
	PIN_GROUP_MIXED("sdcard_grp",
			byt_score_sdcard_pins, byt_score_sdcard_mux),
	PIN_GROUP_SIMPLE("sdio_grp",
			 byt_score_sdio_pins, byt_score_sdio_mux),
	PIN_GROUP_SIMPLE("emmc_grp",
			 byt_score_emmc_pins, byt_score_emmc_mux),
	PIN_GROUP_SIMPLE("lpc_grp",
			 byt_score_ilb_lpc_pins, byt_score_lpc_mux),
	PIN_GROUP_SIMPLE("sata_grp",
			 byt_score_sata_pins, byt_score_sata_mux),
	PIN_GROUP_SIMPLE("plt_clk0_grp",
			 byt_score_plt_clk0_pins, byt_score_plt_clk_mux),
	PIN_GROUP_SIMPLE("plt_clk1_grp",
			 byt_score_plt_clk1_pins, byt_score_plt_clk_mux),
	PIN_GROUP_SIMPLE("plt_clk2_grp",
			 byt_score_plt_clk2_pins, byt_score_plt_clk_mux),
	PIN_GROUP_SIMPLE("plt_clk3_grp",
			 byt_score_plt_clk3_pins, byt_score_plt_clk_mux),
	PIN_GROUP_SIMPLE("plt_clk4_grp",
			 byt_score_plt_clk4_pins, byt_score_plt_clk_mux),
	PIN_GROUP_SIMPLE("plt_clk5_grp",
			 byt_score_plt_clk5_pins, byt_score_plt_clk_mux),
	PIN_GROUP_SIMPLE("smbus_grp",
			 byt_score_smbus_pins, byt_score_smbus_mux),
};

static const char * const byt_score_uart_groups[] = {
	"uart1_grp", "uart2_grp",
};
static const char * const byt_score_pwm_groups[] = {
	"pwm0_grp", "pwm1_grp",
};
static const char * const byt_score_ssp_groups[] = {
	"ssp0_grp", "ssp1_grp", "ssp2_grp",
};
static const char * const byt_score_spi_groups[] = { "sio_spi_grp" };
static const char * const byt_score_i2c_groups[] = {
	"i2c0_grp", "i2c1_grp", "i2c2_grp", "i2c3_grp", "i2c4_grp", "i2c5_grp",
	"i2c6_grp",
};
static const char * const byt_score_sdcard_groups[] = { "sdcard_grp" };
static const char * const byt_score_sdio_groups[] = { "sdio_grp" };
static const char * const byt_score_emmc_groups[] = { "emmc_grp" };
static const char * const byt_score_lpc_groups[] = { "lpc_grp" };
static const char * const byt_score_sata_groups[] = { "sata_grp" };
static const char * const byt_score_plt_clk_groups[] = {
	"plt_clk0_grp", "plt_clk1_grp", "plt_clk2_grp", "plt_clk3_grp",
	"plt_clk4_grp", "plt_clk5_grp",
};
static const char * const byt_score_smbus_groups[] = { "smbus_grp" };
static const char * const byt_score_gpio_groups[] = {
	"uart1_grp", "uart2_grp", "pwm0_grp", "pwm1_grp", "ssp0_grp",
	"ssp1_grp", "ssp2_grp", "sio_spi_grp", "i2c0_grp", "i2c1_grp",
	"i2c2_grp", "i2c3_grp", "i2c4_grp", "i2c5_grp", "i2c6_grp",
	"sdcard_grp", "sdio_grp", "emmc_grp", "lpc_grp", "sata_grp",
	"plt_clk0_grp", "plt_clk1_grp", "plt_clk2_grp", "plt_clk3_grp",
	"plt_clk4_grp", "plt_clk5_grp", "smbus_grp",

};

static const struct byt_function byt_score_functions[] = {
	FUNCTION("uart", byt_score_uart_groups),
	FUNCTION("pwm", byt_score_pwm_groups),
	FUNCTION("ssp", byt_score_ssp_groups),
	FUNCTION("spi", byt_score_spi_groups),
	FUNCTION("i2c", byt_score_i2c_groups),
	FUNCTION("sdcard", byt_score_sdcard_groups),
	FUNCTION("sdio", byt_score_sdio_groups),
	FUNCTION("emmc", byt_score_emmc_groups),
	FUNCTION("lpc", byt_score_lpc_groups),
	FUNCTION("sata", byt_score_sata_groups),
	FUNCTION("plt_clk", byt_score_plt_clk_groups),
	FUNCTION("smbus", byt_score_smbus_groups),
	FUNCTION("gpio", byt_score_gpio_groups),
};

static const struct byt_community byt_score_communities[] = {
	COMMUNITY(0, BYT_NGPIO_SCORE, byt_score_pins_map),
};

static const struct byt_pinctrl_soc_data byt_score_soc_data = {
	.uid		= BYT_SCORE_ACPI_UID,
	.pins		= byt_score_pins,
	.npins		= ARRAY_SIZE(byt_score_pins),
	.groups		= byt_score_groups,
	.ngroups	= ARRAY_SIZE(byt_score_groups),
	.functions	= byt_score_functions,
	.nfunctions	= ARRAY_SIZE(byt_score_functions),
	.communities	= byt_score_communities,
	.ncommunities	= ARRAY_SIZE(byt_score_communities),
};

/* SUS pins, aka GPIOS_<pin_no> or GPIO_S5[<pin_no>]  */
static const struct pinctrl_pin_desc byt_sus_pins[] = {
	PINCTRL_PIN(0, "GPIO_S50"),
	PINCTRL_PIN(1, "GPIO_S51"),
	PINCTRL_PIN(2, "GPIO_S52"),
	PINCTRL_PIN(3, "GPIO_S53"),
	PINCTRL_PIN(4, "GPIO_S54"),
	PINCTRL_PIN(5, "GPIO_S55"),
	PINCTRL_PIN(6, "GPIO_S56"),
	PINCTRL_PIN(7, "GPIO_S57"),
	PINCTRL_PIN(8, "GPIO_S58"),
	PINCTRL_PIN(9, "GPIO_S59"),
	PINCTRL_PIN(10, "GPIO_S510"),
	PINCTRL_PIN(11, "PMC_SUSPWRDNACK"),
	PINCTRL_PIN(12, "PMC_SUSCLK0"),
	PINCTRL_PIN(13, "GPIO_S513"),
	PINCTRL_PIN(14, "USB_ULPI_RST"),
	PINCTRL_PIN(15, "PMC_WAKE_PCIE0#"),
	PINCTRL_PIN(16, "PMC_PWRBTN"),
	PINCTRL_PIN(17, "GPIO_S517"),
	PINCTRL_PIN(18, "PMC_SUS_STAT"),
	PINCTRL_PIN(19, "USB_OC0"),
	PINCTRL_PIN(20, "USB_OC1"),
	PINCTRL_PIN(21, "PCU_SPI_CS1"),
	PINCTRL_PIN(22, "GPIO_S522"),
	PINCTRL_PIN(23, "GPIO_S523"),
	PINCTRL_PIN(24, "GPIO_S524"),
	PINCTRL_PIN(25, "GPIO_S525"),
	PINCTRL_PIN(26, "GPIO_S526"),
	PINCTRL_PIN(27, "GPIO_S527"),
	PINCTRL_PIN(28, "GPIO_S528"),
	PINCTRL_PIN(29, "GPIO_S529"),
	PINCTRL_PIN(30, "GPIO_S530"),
	PINCTRL_PIN(31, "USB_ULPI_CLK"),
	PINCTRL_PIN(32, "USB_ULPI_DATA0"),
	PINCTRL_PIN(33, "USB_ULPI_DATA1"),
	PINCTRL_PIN(34, "USB_ULPI_DATA2"),
	PINCTRL_PIN(35, "USB_ULPI_DATA3"),
	PINCTRL_PIN(36, "USB_ULPI_DATA4"),
	PINCTRL_PIN(37, "USB_ULPI_DATA5"),
	PINCTRL_PIN(38, "USB_ULPI_DATA6"),
	PINCTRL_PIN(39, "USB_ULPI_DATA7"),
	PINCTRL_PIN(40, "USB_ULPI_DIR"),
	PINCTRL_PIN(41, "USB_ULPI_NXT"),
	PINCTRL_PIN(42, "USB_ULPI_STP"),
	PINCTRL_PIN(43, "USB_ULPI_REFCLK"),
};

static const unsigned int sus_pins[BYT_NGPIO_SUS] = {
	29, 33, 30, 31, 32, 34, 36, 35, 38, 37,
	18, 7, 11, 20, 17, 1, 8, 10, 19, 12,
	0, 2, 23, 39, 28, 27, 22, 21, 24, 25,
	26, 51, 56, 54, 49, 55, 48, 57, 50, 58,
	52, 53, 59, 40,
};

static const unsigned int byt_sus_pins_map[BYT_NGPIO_SUS] = {
	29, 33, 30, 31, 32, 34, 36, 35, 38, 37,
	18, 7, 11, 20, 17, 1, 8, 10, 19, 12,
	0, 2, 23, 39, 28, 27, 22, 21, 24, 25,
	26, 51, 56, 54, 49, 55, 48, 57, 50, 58,
	52, 53, 59, 40,
};

static const unsigned int byt_sus_usb_over_current_pins[] = { 19, 20 };
static const struct byt_simple_func_mux byt_sus_usb_oc_mux[] = {
	SIMPLE_FUNC("usb", 0),
	SIMPLE_FUNC("gpio", 1),
};

static const unsigned int byt_sus_usb_ulpi_pins[] = {
	14, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43,
};
static const unsigned short byt_sus_usb_ulpi_mode_values[] = {
	2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
};
static const unsigned short byt_sus_usb_ulpi_gpio_mode_values[] = {
	1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
static const struct byt_mixed_func_mux byt_sus_usb_ulpi_mux[] = {
	MIXED_FUNC("usb", byt_sus_usb_ulpi_mode_values),
	MIXED_FUNC("gpio", byt_sus_usb_ulpi_gpio_mode_values),
};

static const unsigned int byt_sus_pcu_spi_pins[] = { 21 };
static const struct byt_simple_func_mux byt_sus_pcu_spi_mux[] = {
	SIMPLE_FUNC("spi", 0),
	SIMPLE_FUNC("gpio", 1),
};

static const struct byt_pingroup byt_sus_groups[] = {
	PIN_GROUP_SIMPLE("usb_oc_grp",
			byt_sus_usb_over_current_pins, byt_sus_usb_oc_mux),
	PIN_GROUP_MIXED("usb_ulpi_grp",
			byt_sus_usb_ulpi_pins, byt_sus_usb_ulpi_mux),
	PIN_GROUP_SIMPLE("pcu_spi_grp",
			byt_sus_pcu_spi_pins, byt_sus_pcu_spi_mux),
};

static const char * const byt_sus_usb_groups[] = {
	"usb_oc_grp", "usb_ulpi_grp",
};
static const char * const byt_sus_spi_groups[] = { "pcu_spi_grp" };
static const char * const byt_sus_gpio_groups[] = {
	"usb_oc_grp", "usb_ulpi_grp", "pcu_spi_grp",
};

static const struct byt_function byt_sus_functions[] = {
	FUNCTION("usb", byt_sus_usb_groups),
	FUNCTION("spi", byt_sus_spi_groups),
	FUNCTION("gpio", byt_sus_gpio_groups),
};

static const struct byt_community byt_sus_communities[] = {
	COMMUNITY(0, BYT_NGPIO_SUS, byt_sus_pins_map),
};

static const struct byt_pinctrl_soc_data byt_sus_soc_data = {
	.uid		= BYT_SUS_ACPI_UID,
	.pins		= byt_sus_pins,
	.npins		= ARRAY_SIZE(byt_sus_pins),
	.groups		= byt_sus_groups,
	.ngroups	= ARRAY_SIZE(byt_sus_groups),
	.functions	= byt_sus_functions,
	.nfunctions	= ARRAY_SIZE(byt_sus_functions),
	.communities	= byt_sus_communities,
	.ncommunities	= ARRAY_SIZE(byt_sus_communities),
};

static const struct pinctrl_pin_desc byt_ncore_pins[] = {
	PINCTRL_PIN(0, "GPIO_NCORE0"),
	PINCTRL_PIN(1, "GPIO_NCORE1"),
	PINCTRL_PIN(2, "GPIO_NCORE2"),
	PINCTRL_PIN(3, "GPIO_NCORE3"),
	PINCTRL_PIN(4, "GPIO_NCORE4"),
	PINCTRL_PIN(5, "GPIO_NCORE5"),
	PINCTRL_PIN(6, "GPIO_NCORE6"),
	PINCTRL_PIN(7, "GPIO_NCORE7"),
	PINCTRL_PIN(8, "GPIO_NCORE8"),
	PINCTRL_PIN(9, "GPIO_NCORE9"),
	PINCTRL_PIN(10, "GPIO_NCORE10"),
	PINCTRL_PIN(11, "GPIO_NCORE11"),
	PINCTRL_PIN(12, "GPIO_NCORE12"),
	PINCTRL_PIN(13, "GPIO_NCORE13"),
	PINCTRL_PIN(14, "GPIO_NCORE14"),
	PINCTRL_PIN(15, "GPIO_NCORE15"),
	PINCTRL_PIN(16, "GPIO_NCORE16"),
	PINCTRL_PIN(17, "GPIO_NCORE17"),
	PINCTRL_PIN(18, "GPIO_NCORE18"),
	PINCTRL_PIN(19, "GPIO_NCORE19"),
	PINCTRL_PIN(20, "GPIO_NCORE20"),
	PINCTRL_PIN(21, "GPIO_NCORE21"),
	PINCTRL_PIN(22, "GPIO_NCORE22"),
	PINCTRL_PIN(23, "GPIO_NCORE23"),
	PINCTRL_PIN(24, "GPIO_NCORE24"),
	PINCTRL_PIN(25, "GPIO_NCORE25"),
	PINCTRL_PIN(26, "GPIO_NCORE26"),
	PINCTRL_PIN(27, "GPIO_NCORE27"),
};

static unsigned const byt_ncore_pins_map[BYT_NGPIO_NCORE] = {
	19, 18, 17, 20, 21, 22, 24, 25, 23, 16,
	14, 15, 12, 26, 27, 1, 4, 8, 11, 0,
	3, 6, 10, 13, 2, 5, 9, 7,
};

static const struct byt_community byt_ncore_communities[] = {
	COMMUNITY(0, BYT_NGPIO_NCORE, byt_ncore_pins_map),
};

static const struct byt_pinctrl_soc_data byt_ncore_soc_data = {
	.uid		= BYT_NCORE_ACPI_UID,
	.pins		= byt_ncore_pins,
	.npins		= ARRAY_SIZE(byt_ncore_pins),
	.communities	= byt_ncore_communities,
	.ncommunities	= ARRAY_SIZE(byt_ncore_communities),
};

static unsigned const ncore_pins[BYT_NGPIO_NCORE] = {
	19, 18, 17, 20, 21, 22, 24, 25, 23, 16,
	14, 15, 12, 26, 27, 1, 4, 8, 11, 0,
	3, 6, 10, 13, 2, 5, 9, 7,
};

static struct pinctrl_gpio_range byt_ranges[] = {
	{
		.name = BYT_SCORE_ACPI_UID, /* match with acpi _UID in probe */
		.npins = BYT_NGPIO_SCORE,
		.pins = score_pins,
	},
	{
		.name = BYT_NCORE_ACPI_UID,
		.npins = BYT_NGPIO_NCORE,
		.pins = ncore_pins,
	},
	{
		.name = BYT_SUS_ACPI_UID,
		.npins = BYT_NGPIO_SUS,
		.pins = sus_pins,
	},
	{
	},
};

struct byt_gpio {
	struct gpio_chip		chip;
	struct platform_device		*pdev;
	raw_spinlock_t			lock;
	void __iomem			*reg_base;
	struct pinctrl_gpio_range	*range;
	struct byt_gpio_pin_context	*saved_context;
	const struct byt_pinctrl_soc_data *soc_data;
	struct byt_community		*communities_copy;
};

static const struct byt_pinctrl_soc_data *byt_soc_data[] = {
	&byt_score_soc_data,
	&byt_sus_soc_data,
	&byt_ncore_soc_data,
	NULL,
};

static struct byt_community *byt_get_community(struct byt_gpio *vg,
					       unsigned int pin)
{
	struct byt_community *comm;
	int i;

	for (i = 0; i < vg->soc_data->ncommunities; i++) {
		comm = vg->communities_copy + i;
		if (pin < comm->pin_base + comm->npins && pin >= comm->pin_base)
			return comm;
	}

	return NULL;
}

static void __iomem *byt_gpio_reg(struct byt_gpio *vg, unsigned int offset,
				  int reg)
{
	struct byt_community *comm = byt_get_community(vg, offset);
	u32 reg_offset = 0;

	if (!comm)
		return NULL;

	offset -= comm->pin_base;
	if (reg == BYT_INT_STAT_REG)
		reg_offset = (offset / 32) * 4;
	else
		reg_offset = comm->pad_map[offset] * 16;

	return comm->reg_base + reg_offset + reg;
}

static int byt_get_groups_count(struct pinctrl_dev *pctldev)
{
	struct byt_gpio *vg = pinctrl_dev_get_drvdata(pctldev);

	return vg->soc_data->ngroups;
}

static const char *byt_get_group_name(struct pinctrl_dev *pctldev,
				      unsigned int selector)
{
	struct byt_gpio *vg = pinctrl_dev_get_drvdata(pctldev);

	return vg->soc_data->groups[selector].name;
}

static int byt_get_group_pins(struct pinctrl_dev *pctldev,
			      unsigned int selector,
			      const unsigned int **pins,
			      unsigned int *num_pins)
{
	struct byt_gpio *vg = pinctrl_dev_get_drvdata(pctldev);

	*pins		= vg->soc_data->groups[selector].pins;
	*num_pins	= vg->soc_data->groups[selector].npins;

	return 0;
}

static const struct pinctrl_ops byt_pinctrl_ops = {
	.get_groups_count	= byt_get_groups_count,
	.get_group_name		= byt_get_group_name,
	.get_group_pins		= byt_get_group_pins,
};

static int byt_get_functions_count(struct pinctrl_dev *pctldev)
{
	struct byt_gpio *vg = pinctrl_dev_get_drvdata(pctldev);

	return vg->soc_data->nfunctions;
}

static const char *byt_get_function_name(struct pinctrl_dev *pctldev,
					 unsigned int selector)
{
	struct byt_gpio *vg = pinctrl_dev_get_drvdata(pctldev);

	return vg->soc_data->functions[selector].name;
}

static int byt_get_function_groups(struct pinctrl_dev *pctldev,
				   unsigned int selector,
				   const char * const **groups,
				   unsigned int *num_groups)
{
	struct byt_gpio *vg = pinctrl_dev_get_drvdata(pctldev);

	*groups		= vg->soc_data->functions[selector].groups;
	*num_groups	= vg->soc_data->functions[selector].ngroups;

	return 0;
}

static int byt_get_group_simple_mux(const struct byt_pingroup group,
				    const char *func_name,
				    unsigned short *func)
{
	int i;

	for (i = 0; i < group.nfuncs; i++) {
		if (!strcmp(group.simple_funcs[i].name, func_name)) {
			*func = group.simple_funcs[i].func;
			return 0;
		}
	}

	return 1;
}

static int byt_get_group_mixed_mux(const struct byt_pingroup group,
				   const char *func_name,
				   const unsigned short **func)
{
	int i;

	for (i = 0; i < group.nfuncs; i++) {
		if (!strcmp(group.mixed_funcs[i].name, func_name)) {
			*func = group.mixed_funcs[i].func_values;
			return 0;
		}
	}

	return 1;
}

static void byt_set_group_simple_mux(struct byt_gpio *vg,
				     const struct byt_pingroup group,
				     unsigned short func)
{
	unsigned long flags;
	int i;

	raw_spin_lock_irqsave(&vg->lock, flags);

	for (i = 0; i < group.npins; i++) {
		void __iomem *padcfg0;
		u32 value;

		padcfg0 = byt_gpio_reg(vg, group.pins[i], BYT_CONF0_REG);
		if (!padcfg0) {
			dev_warn(&vg->pdev->dev,
				 "Group %s, pin %i not muxed (no padcfg0)\n",
				 group.name, i);
			continue;
		}

		value = readl(padcfg0);
		value &= ~BYT_PIN_MUX;
		value |= func;
		writel(value, padcfg0);
	}

	raw_spin_unlock_irqrestore(&vg->lock, flags);
}

static void byt_set_group_mixed_mux(struct byt_gpio *vg,
				    const struct byt_pingroup group,
				    const unsigned short *func)
{
	unsigned long flags;
	int i;

	raw_spin_lock_irqsave(&vg->lock, flags);

	for (i = 0; i < group.npins; i++) {
		void __iomem *padcfg0;
		u32 value;

		padcfg0 = byt_gpio_reg(vg, group.pins[i], BYT_CONF0_REG);
		if (!padcfg0) {
			dev_warn(&vg->pdev->dev,
				 "Group %s, pin %i not muxed (no padcfg0)\n",
				 group.name, i);
			continue;
		}

		value = readl(padcfg0);
		value &= ~BYT_PIN_MUX;
		value |= func[i];
		writel(value, padcfg0);
	}

	raw_spin_unlock_irqrestore(&vg->lock, flags);
}

static int byt_set_mux(struct pinctrl_dev *pctldev, unsigned int func_selector,
		       unsigned int group_selector)
{
	struct byt_gpio *vg = pinctrl_dev_get_drvdata(pctldev);
	const struct byt_function func = vg->soc_data->functions[func_selector];
	const struct byt_pingroup group = vg->soc_data->groups[group_selector];
	const unsigned short *mixed_func;
	unsigned short simple_func;
	int ret = 1;

	if (group.has_simple_funcs)
		ret = byt_get_group_simple_mux(group, func.name, &simple_func);
	else
		ret = byt_get_group_mixed_mux(group, func.name, &mixed_func);

	if (ret)
		byt_set_group_simple_mux(vg, group, BYT_DEFAULT_GPIO_MUX);
	else if (group.has_simple_funcs)
		byt_set_group_simple_mux(vg, group, simple_func);
	else
		byt_set_group_mixed_mux(vg, group, mixed_func);

	return 0;
}

static u32 byt_get_gpio_mux(struct byt_gpio *vg, unsigned offset)
{
	/* SCORE pin 92-93 */
	if (!strcmp(vg->soc_data->uid, BYT_SCORE_ACPI_UID) &&
	    offset >= 92 && offset <= 93)
		return 1;

	/* SUS pin 11-21 */
	if (!strcmp(vg->soc_data->uid, BYT_SUS_ACPI_UID) &&
	    offset >= 11 && offset <= 21)
		return 1;

	return 0;
}

static void byt_gpio_clear_triggering(struct byt_gpio *vg, unsigned int offset)
{
	void __iomem *reg = byt_gpio_reg(vg, offset, BYT_CONF0_REG);
	unsigned long flags;
	u32 value;

	raw_spin_lock_irqsave(&vg->lock, flags);
	value = readl(reg);
	value &= ~(BYT_TRIG_POS | BYT_TRIG_NEG | BYT_TRIG_LVL);
	writel(value, reg);
	raw_spin_unlock_irqrestore(&vg->lock, flags);
}

static int byt_gpio_request_enable(struct pinctrl_dev *pctl_dev,
				   struct pinctrl_gpio_range *range,
				   unsigned int offset)
{
	struct byt_gpio *vg = pinctrl_dev_get_drvdata(pctl_dev);
	void __iomem *reg = byt_gpio_reg(vg, offset, BYT_CONF0_REG);
	u32 value, gpio_mux;
	unsigned long flags;

	raw_spin_lock_irqsave(&vg->lock, flags);

	/*
	 * In most cases, func pin mux 000 means GPIO function.
	 * But, some pins may have func pin mux 001 represents
	 * GPIO function.
	 *
	 * Because there are devices out there where some pins were not
	 * configured correctly we allow changing the mux value from
	 * request (but print out warning about that).
	 */
	value = readl(reg) & BYT_PIN_MUX;
	gpio_mux = byt_get_gpio_mux(vg, offset);
	if (WARN_ON(gpio_mux != value)) {
		value = readl(reg) & ~BYT_PIN_MUX;
		value |= gpio_mux;
		writel(value, reg);

		dev_warn(&vg->pdev->dev,
			 "pin %u forcibly re-configured as GPIO\n", offset);
	}

	raw_spin_unlock_irqrestore(&vg->lock, flags);

	pm_runtime_get(&vg->pdev->dev);

	return 0;
}

static void byt_gpio_free(struct gpio_chip *chip, unsigned offset)
{
	struct byt_gpio *vg = gpiochip_get_data(chip);

	byt_gpio_clear_triggering(vg, offset);
	pm_runtime_put(&vg->pdev->dev);
}

static void byt_gpio_disable_free(struct pinctrl_dev *pctl_dev,
				  struct pinctrl_gpio_range *range,
				  unsigned int offset)
{
	struct byt_gpio *vg = pinctrl_dev_get_drvdata(pctl_dev);

	byt_gpio_clear_triggering(vg, offset);
	pm_runtime_put(&vg->pdev->dev);
}

static int byt_gpio_set_direction(struct pinctrl_dev *pctl_dev,
				  struct pinctrl_gpio_range *range,
				  unsigned int offset,
				  bool input)
{
	struct byt_gpio *vg = pinctrl_dev_get_drvdata(pctl_dev);
	void __iomem *val_reg = byt_gpio_reg(vg, offset, BYT_VAL_REG);
	void __iomem *conf_reg = byt_gpio_reg(vg, offset, BYT_CONF0_REG);
	unsigned long flags;
	u32 value;

	raw_spin_lock_irqsave(&vg->lock, flags);

	value = readl(val_reg);
	value &= ~BYT_DIR_MASK;
	if (input)
		value |= BYT_OUTPUT_EN;
	else
		/*
		 * Before making any direction modifications, do a check if gpio
		 * is set for direct IRQ.  On baytrail, setting GPIO to output
		 * does not make sense, so let's at least warn the caller before
		 * they shoot themselves in the foot.
		 */
		WARN(readl(conf_reg) & BYT_DIRECT_IRQ_EN,
		     "Potential Error: Setting GPIO with direct_irq_en to output");
	writel(value, val_reg);

	raw_spin_unlock_irqrestore(&vg->lock, flags);

	return 0;
}

static const struct pinmux_ops byt_pinmux_ops = {
	.get_functions_count	= byt_get_functions_count,
	.get_function_name	= byt_get_function_name,
	.get_function_groups	= byt_get_function_groups,
	.set_mux		= byt_set_mux,
	.gpio_request_enable	= byt_gpio_request_enable,
	.gpio_disable_free	= byt_gpio_disable_free,
	.gpio_set_direction	= byt_gpio_set_direction,
};

static int byt_gpio_request(struct gpio_chip *chip, unsigned int offset)
{
	struct byt_gpio *vg = gpiochip_get_data(chip);
	void __iomem *reg = byt_gpio_reg(vg, offset, BYT_CONF0_REG);
	u32 value, gpio_mux;
	unsigned long flags;

	raw_spin_lock_irqsave(&vg->lock, flags);

	/*
	 * In most cases, func pin mux 000 means GPIO function.
	 * But, some pins may have func pin mux 001 represents
	 * GPIO function.
	 *
	 * Because there are devices out there where some pins were not
	 * configured correctly we allow changing the mux value from
	 * request (but print out warning about that).
	 */
	value = readl(reg) & BYT_PIN_MUX;
	gpio_mux = byt_get_gpio_mux(vg, offset);
	if (WARN_ON(gpio_mux != value)) {
		value = readl(reg) & ~BYT_PIN_MUX;
		value |= gpio_mux;
		writel(value, reg);

		dev_warn(&vg->pdev->dev,
			 "pin %u forcibly re-configured as GPIO\n", offset);
	}

	raw_spin_unlock_irqrestore(&vg->lock, flags);

	pm_runtime_get(&vg->pdev->dev);

	return 0;
}

static int byt_irq_type(struct irq_data *d, unsigned type)
{
	struct byt_gpio *vg = gpiochip_get_data(irq_data_get_irq_chip_data(d));
	u32 offset = irqd_to_hwirq(d);
	u32 value;
	unsigned long flags;
	void __iomem *reg = byt_gpio_reg(vg, offset, BYT_CONF0_REG);

	if (offset >= vg->chip.ngpio)
		return -EINVAL;

	raw_spin_lock_irqsave(&vg->lock, flags);
	value = readl(reg);

	WARN(value & BYT_DIRECT_IRQ_EN,
	     "Bad pad config for io mode, force direct_irq_en bit clearing");

	/* For level trigges the BYT_TRIG_POS and BYT_TRIG_NEG bits
	 * are used to indicate high and low level triggering
	 */
	value &= ~(BYT_DIRECT_IRQ_EN | BYT_TRIG_POS | BYT_TRIG_NEG |
		   BYT_TRIG_LVL);

	writel(value, reg);

	if (type & IRQ_TYPE_EDGE_BOTH)
		irq_set_handler_locked(d, handle_edge_irq);
	else if (type & IRQ_TYPE_LEVEL_MASK)
		irq_set_handler_locked(d, handle_level_irq);

	raw_spin_unlock_irqrestore(&vg->lock, flags);

	return 0;
}

static void byt_get_pull_strength(u32 reg, u16 *strength)
{
	switch (reg & BYT_PULL_STR_MASK) {
	case BYT_PULL_STR_2K:
		*strength = 2000;
		break;
	case BYT_PULL_STR_10K:
		*strength = 10000;
		break;
	case BYT_PULL_STR_20K:
		*strength = 20000;
		break;
	case BYT_PULL_STR_40K:
		*strength = 40000;
		break;
	}
}

static int byt_set_pull_strength(u32 *reg, u16 strength)
{
	*reg &= ~BYT_PULL_STR_MASK;

	switch (strength) {
	case 2000:
		*reg |= BYT_PULL_STR_2K;
		break;
	case 10000:
		*reg |= BYT_PULL_STR_10K;
		break;
	case 20000:
		*reg |= BYT_PULL_STR_20K;
		break;
	case 40000:
		*reg |= BYT_PULL_STR_40K;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int byt_pin_config_get(struct pinctrl_dev *pctl_dev, unsigned int offset,
			      unsigned long *config)
{
	struct byt_gpio *vg = pinctrl_dev_get_drvdata(pctl_dev);
	enum pin_config_param param = pinconf_to_config_param(*config);
	void __iomem *conf_reg = byt_gpio_reg(vg, offset, BYT_CONF0_REG);
	void __iomem *val_reg = byt_gpio_reg(vg, offset, BYT_VAL_REG);
	unsigned long flags;
	u32 conf, pull, val;
	u16 arg = 0;

	raw_spin_lock_irqsave(&vg->lock, flags);
	conf = readl(conf_reg);
	pull = conf & BYT_PULL_ASSIGN_MASK;
	val = readl(val_reg);
	raw_spin_unlock_irqrestore(&vg->lock, flags);

	switch (param) {
	case PIN_CONFIG_BIAS_DISABLE:
		if (pull)
			return -EINVAL;
		break;
	case PIN_CONFIG_BIAS_PULL_DOWN:
		/* Pull assignment is only applicable in input mode */
		if ((val & BYT_INPUT_EN) || pull != BYT_PULL_ASSIGN_DOWN)
			return -EINVAL;

		byt_get_pull_strength(conf, &arg);

		break;
	case PIN_CONFIG_BIAS_PULL_UP:
		/* Pull assignment is only applicable in input mode */
		if ((val & BYT_INPUT_EN) || pull != BYT_PULL_ASSIGN_UP)
			return -EINVAL;

		byt_get_pull_strength(conf, &arg);

		break;
	default:
		return -ENOTSUPP;
	}

	*config = pinconf_to_config_packed(param, arg);

	return 0;
}

static int byt_pin_config_set(struct pinctrl_dev *pctl_dev,
			      unsigned int offset,
			      unsigned long *configs,
			      unsigned int num_configs)
{
	struct byt_gpio *vg = pinctrl_dev_get_drvdata(pctl_dev);
	unsigned int param, arg;
	void __iomem *conf_reg = byt_gpio_reg(vg, offset, BYT_CONF0_REG);
	void __iomem *val_reg = byt_gpio_reg(vg, offset, BYT_VAL_REG);
	unsigned long flags;
	u32 conf, val;
	int i, ret = 0;

	raw_spin_lock_irqsave(&vg->lock, flags);

	conf = readl(conf_reg);
	val = readl(val_reg);

	for (i = 0; i < num_configs; i++) {
		param = pinconf_to_config_param(configs[i]);
		arg = pinconf_to_config_argument(configs[i]);

		switch (param) {
		case PIN_CONFIG_BIAS_DISABLE:
			conf &= ~BYT_PULL_ASSIGN_MASK;
			break;
		case PIN_CONFIG_BIAS_PULL_DOWN:
			/* Set default strength value in case none is given */
			if (arg == 1)
				arg = 2000;

			/*
			 * Pull assignment is only applicable in input mode. If
			 * chip is not in input mode, set it and warn about it.
			 */
			if (val & BYT_INPUT_EN) {
				val &= ~BYT_INPUT_EN;
				writel(val, val_reg);
				dev_warn(&vg->pdev->dev,
					 "pin %u forcibly set to input mode\n",
					 offset);
			}

			conf &= ~BYT_PULL_ASSIGN_MASK;
			conf |= BYT_PULL_ASSIGN_DOWN;
			ret = byt_set_pull_strength(&conf, arg);

			break;
		case PIN_CONFIG_BIAS_PULL_UP:
			/* Set default strength value in case none is given */
			if (arg == 1)
				arg = 2000;

			/*
			 * Pull assignment is only applicable in input mode. If
			 * chip is not in input mode, set it and warn about it.
			 */
			if (val & BYT_INPUT_EN) {
				val &= ~BYT_INPUT_EN;
				writel(val, val_reg);
				dev_warn(&vg->pdev->dev,
					 "pin %u forcibly set to input mode\n",
					 offset);
			}

			conf &= ~BYT_PULL_ASSIGN_MASK;
			conf |= BYT_PULL_ASSIGN_UP;
			ret = byt_set_pull_strength(&conf, arg);

			break;
		default:
			ret = -ENOTSUPP;
		}

		if (ret)
			break;
	}

	if (!ret)
		writel(conf, conf_reg);

	raw_spin_unlock_irqrestore(&vg->lock, flags);

	return ret;
}

static const struct pinconf_ops byt_pinconf_ops = {
	.is_generic	= true,
	.pin_config_get	= byt_pin_config_get,
	.pin_config_set	= byt_pin_config_set,
};

static const struct pinctrl_desc byt_pinctrl_desc = {
	.pctlops	= &byt_pinctrl_ops,
	.pmxops		= &byt_pinmux_ops,
	.confops	= &byt_pinconf_ops,
	.owner		= THIS_MODULE,
};

static int byt_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	struct byt_gpio *vg = gpiochip_get_data(chip);
	void __iomem *reg = byt_gpio_reg(vg, offset, BYT_VAL_REG);
	unsigned long flags;
	u32 val;

	raw_spin_lock_irqsave(&vg->lock, flags);
	val = readl(reg);
	raw_spin_unlock_irqrestore(&vg->lock, flags);

	return !!(val & BYT_LEVEL);
}

static void byt_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
	struct byt_gpio *vg = gpiochip_get_data(chip);
	void __iomem *reg = byt_gpio_reg(vg, offset, BYT_VAL_REG);
	unsigned long flags;
	u32 old_val;

	raw_spin_lock_irqsave(&vg->lock, flags);

	old_val = readl(reg);

	if (value)
		writel(old_val | BYT_LEVEL, reg);
	else
		writel(old_val & ~BYT_LEVEL, reg);

	raw_spin_unlock_irqrestore(&vg->lock, flags);
}

static int byt_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
	struct byt_gpio *vg = gpiochip_get_data(chip);
	void __iomem *reg = byt_gpio_reg(vg, offset, BYT_VAL_REG);
	unsigned long flags;
	u32 value;

	raw_spin_lock_irqsave(&vg->lock, flags);

	value = readl(reg) | BYT_DIR_MASK;
	value &= ~BYT_INPUT_EN;		/* active low */
	writel(value, reg);

	raw_spin_unlock_irqrestore(&vg->lock, flags);

	return 0;
}

static int byt_gpio_direction_output(struct gpio_chip *chip,
				     unsigned gpio, int value)
{
	struct byt_gpio *vg = gpiochip_get_data(chip);
	void __iomem *conf_reg = byt_gpio_reg(vg, gpio, BYT_CONF0_REG);
	void __iomem *reg = byt_gpio_reg(vg, gpio, BYT_VAL_REG);
	unsigned long flags;
	u32 reg_val;

	raw_spin_lock_irqsave(&vg->lock, flags);

	/*
	 * Before making any direction modifications, do a check if gpio
	 * is set for direct IRQ.  On baytrail, setting GPIO to output does
	 * not make sense, so let's at least warn the caller before they shoot
	 * themselves in the foot.
	 */
	WARN(readl(conf_reg) & BYT_DIRECT_IRQ_EN,
		"Potential Error: Setting GPIO with direct_irq_en to output");

	reg_val = readl(reg) | BYT_DIR_MASK;
	reg_val &= ~(BYT_OUTPUT_EN | BYT_INPUT_EN);

	if (value)
		writel(reg_val | BYT_LEVEL, reg);
	else
		writel(reg_val & ~BYT_LEVEL, reg);

	raw_spin_unlock_irqrestore(&vg->lock, flags);

	return 0;
}

static void byt_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
{
	struct byt_gpio *vg = gpiochip_get_data(chip);
	int i;
	u32 conf0, val, offs;

	for (i = 0; i < vg->chip.ngpio; i++) {
		const char *pull_str = NULL;
		const char *pull = NULL;
		unsigned long flags;
		const char *label;
		offs = vg->range->pins[i] * 16;

		raw_spin_lock_irqsave(&vg->lock, flags);
		conf0 = readl(vg->reg_base + offs + BYT_CONF0_REG);
		val = readl(vg->reg_base + offs + BYT_VAL_REG);
		raw_spin_unlock_irqrestore(&vg->lock, flags);

		label = gpiochip_is_requested(chip, i);
		if (!label)
			label = "Unrequested";

		switch (conf0 & BYT_PULL_ASSIGN_MASK) {
		case BYT_PULL_ASSIGN_UP:
			pull = "up";
			break;
		case BYT_PULL_ASSIGN_DOWN:
			pull = "down";
			break;
		}

		switch (conf0 & BYT_PULL_STR_MASK) {
		case BYT_PULL_STR_2K:
			pull_str = "2k";
			break;
		case BYT_PULL_STR_10K:
			pull_str = "10k";
			break;
		case BYT_PULL_STR_20K:
			pull_str = "20k";
			break;
		case BYT_PULL_STR_40K:
			pull_str = "40k";
			break;
		}

		seq_printf(s,
			   " gpio-%-3d (%-20.20s) %s %s %s pad-%-3d offset:0x%03x mux:%d %s%s%s",
			   i,
			   label,
			   val & BYT_INPUT_EN ? "  " : "in",
			   val & BYT_OUTPUT_EN ? "   " : "out",
			   val & BYT_LEVEL ? "hi" : "lo",
			   vg->range->pins[i], offs,
			   conf0 & 0x7,
			   conf0 & BYT_TRIG_NEG ? " fall" : "     ",
			   conf0 & BYT_TRIG_POS ? " rise" : "     ",
			   conf0 & BYT_TRIG_LVL ? " level" : "      ");

		if (pull && pull_str)
			seq_printf(s, " %-4s %-3s", pull, pull_str);
		else
			seq_puts(s, "          ");

		if (conf0 & BYT_IODEN)
			seq_puts(s, " open-drain");

		seq_puts(s, "\n");
	}
}

static void byt_gpio_irq_handler(struct irq_desc *desc)
{
	struct irq_data *data = irq_desc_get_irq_data(desc);
	struct byt_gpio *vg = gpiochip_get_data(irq_desc_get_handler_data(desc));
	struct irq_chip *chip = irq_data_get_irq_chip(data);
	u32 base, pin;
	void __iomem *reg;
	unsigned long pending;
	unsigned virq;

	/* check from GPIO controller which pin triggered the interrupt */
	for (base = 0; base < vg->chip.ngpio; base += 32) {
		reg = byt_gpio_reg(vg, base, BYT_INT_STAT_REG);
		pending = readl(reg);
		for_each_set_bit(pin, &pending, 32) {
			virq = irq_find_mapping(vg->chip.irqdomain, base + pin);
			generic_handle_irq(virq);
		}
	}
	chip->irq_eoi(data);
}

static void byt_irq_ack(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct byt_gpio *vg = gpiochip_get_data(gc);
	unsigned offset = irqd_to_hwirq(d);
	void __iomem *reg;

	raw_spin_lock(&vg->lock);
	reg = byt_gpio_reg(vg, offset, BYT_INT_STAT_REG);
	writel(BIT(offset % 32), reg);
	raw_spin_unlock(&vg->lock);
}

static void byt_irq_unmask(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct byt_gpio *vg = gpiochip_get_data(gc);
	unsigned offset = irqd_to_hwirq(d);
	unsigned long flags;
	void __iomem *reg;
	u32 value;

	reg = byt_gpio_reg(vg, offset, BYT_CONF0_REG);

	raw_spin_lock_irqsave(&vg->lock, flags);
	value = readl(reg);

	switch (irqd_get_trigger_type(d)) {
	case IRQ_TYPE_LEVEL_HIGH:
		value |= BYT_TRIG_LVL;
	case IRQ_TYPE_EDGE_RISING:
		value |= BYT_TRIG_POS;
		break;
	case IRQ_TYPE_LEVEL_LOW:
		value |= BYT_TRIG_LVL;
	case IRQ_TYPE_EDGE_FALLING:
		value |= BYT_TRIG_NEG;
		break;
	case IRQ_TYPE_EDGE_BOTH:
		value |= (BYT_TRIG_NEG | BYT_TRIG_POS);
		break;
	}

	writel(value, reg);

	raw_spin_unlock_irqrestore(&vg->lock, flags);
}

static void byt_irq_mask(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct byt_gpio *vg = gpiochip_get_data(gc);

	byt_gpio_clear_triggering(vg, irqd_to_hwirq(d));
}

static struct irq_chip byt_irqchip = {
	.name = "BYT-GPIO",
	.irq_ack = byt_irq_ack,
	.irq_mask = byt_irq_mask,
	.irq_unmask = byt_irq_unmask,
	.irq_set_type = byt_irq_type,
	.flags = IRQCHIP_SKIP_SET_WAKE,
};

static void byt_gpio_irq_init_hw(struct byt_gpio *vg)
{
	void __iomem *reg;
	u32 base, value;
	int i;

	/*
	 * Clear interrupt triggers for all pins that are GPIOs and
	 * do not use direct IRQ mode. This will prevent spurious
	 * interrupts from misconfigured pins.
	 */
	for (i = 0; i < vg->chip.ngpio; i++) {
		value = readl(byt_gpio_reg(vg, i, BYT_CONF0_REG));
		if ((value & BYT_PIN_MUX) == byt_get_gpio_mux(vg, i) &&
		    !(value & BYT_DIRECT_IRQ_EN)) {
			byt_gpio_clear_triggering(vg, i);
			dev_dbg(&vg->pdev->dev, "disabling GPIO %d\n", i);
		}
	}

	/* clear interrupt status trigger registers */
	for (base = 0; base < vg->chip.ngpio; base += 32) {
		reg = byt_gpio_reg(vg, base, BYT_INT_STAT_REG);
		writel(0xffffffff, reg);
		/* make sure trigger bits are cleared, if not then a pin
		   might be misconfigured in bios */
		value = readl(reg);
		if (value)
			dev_err(&vg->pdev->dev,
				"GPIO interrupt error, pins misconfigured\n");
	}
}

static int byt_gpio_probe(struct platform_device *pdev)
{
	struct byt_gpio *vg;
	struct gpio_chip *gc;
	struct resource *mem_rc, *irq_rc;
	struct device *dev = &pdev->dev;
	struct acpi_device *acpi_dev;
	struct pinctrl_gpio_range *range;
	acpi_handle handle = ACPI_HANDLE(dev);
	int ret;

	if (acpi_bus_get_device(handle, &acpi_dev))
		return -ENODEV;

	vg = devm_kzalloc(dev, sizeof(struct byt_gpio), GFP_KERNEL);
	if (!vg) {
		dev_err(&pdev->dev, "can't allocate byt_gpio chip data\n");
		return -ENOMEM;
	}

	for (range = byt_ranges; range->name; range++) {
		if (!strcmp(acpi_dev->pnp.unique_id, range->name)) {
			vg->chip.ngpio = range->npins;
			vg->range = range;
			break;
		}
	}

	if (!vg->chip.ngpio || !vg->range)
		return -ENODEV;

	vg->pdev = pdev;
	platform_set_drvdata(pdev, vg);

	mem_rc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	vg->reg_base = devm_ioremap_resource(dev, mem_rc);
	if (IS_ERR(vg->reg_base))
		return PTR_ERR(vg->reg_base);

	raw_spin_lock_init(&vg->lock);

	gc = &vg->chip;
	gc->label = dev_name(&pdev->dev);
	gc->owner = THIS_MODULE;
	gc->request = byt_gpio_request;
	gc->free = byt_gpio_free;
	gc->direction_input = byt_gpio_direction_input;
	gc->direction_output = byt_gpio_direction_output;
	gc->get = byt_gpio_get;
	gc->set = byt_gpio_set;
	gc->dbg_show = byt_gpio_dbg_show;
	gc->base = -1;
	gc->can_sleep = false;
	gc->parent = dev;

#ifdef CONFIG_PM_SLEEP
	vg->saved_context = devm_kcalloc(&pdev->dev, gc->ngpio,
				       sizeof(*vg->saved_context), GFP_KERNEL);
#endif

	ret = gpiochip_add_data(gc, vg);
	if (ret) {
		dev_err(&pdev->dev, "failed adding byt-gpio chip\n");
		return ret;
	}

	/* set up interrupts  */
	irq_rc = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (irq_rc && irq_rc->start) {
		byt_gpio_irq_init_hw(vg);
		ret = gpiochip_irqchip_add(gc, &byt_irqchip, 0,
					   handle_simple_irq, IRQ_TYPE_NONE);
		if (ret) {
			dev_err(dev, "failed to add irqchip\n");
			gpiochip_remove(gc);
			return ret;
		}

		gpiochip_set_chained_irqchip(gc, &byt_irqchip,
					     (unsigned)irq_rc->start,
					     byt_gpio_irq_handler);
	}

	pm_runtime_enable(dev);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int byt_gpio_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct byt_gpio *vg = platform_get_drvdata(pdev);
	int i;

	for (i = 0; i < vg->chip.ngpio; i++) {
		void __iomem *reg;
		u32 value;

		reg = byt_gpio_reg(vg, i, BYT_CONF0_REG);
		value = readl(reg) & BYT_CONF0_RESTORE_MASK;
		vg->saved_context[i].conf0 = value;

		reg = byt_gpio_reg(vg, i, BYT_VAL_REG);
		value = readl(reg) & BYT_VAL_RESTORE_MASK;
		vg->saved_context[i].val = value;
	}

	return 0;
}

static int byt_gpio_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct byt_gpio *vg = platform_get_drvdata(pdev);
	int i;

	for (i = 0; i < vg->chip.ngpio; i++) {
		void __iomem *reg;
		u32 value;

		reg = byt_gpio_reg(vg, i, BYT_CONF0_REG);
		value = readl(reg);
		if ((value & BYT_CONF0_RESTORE_MASK) !=
		     vg->saved_context[i].conf0) {
			value &= ~BYT_CONF0_RESTORE_MASK;
			value |= vg->saved_context[i].conf0;
			writel(value, reg);
			dev_info(dev, "restored pin %d conf0 %#08x", i, value);
		}

		reg = byt_gpio_reg(vg, i, BYT_VAL_REG);
		value = readl(reg);
		if ((value & BYT_VAL_RESTORE_MASK) !=
		     vg->saved_context[i].val) {
			u32 v;

			v = value & ~BYT_VAL_RESTORE_MASK;
			v |= vg->saved_context[i].val;
			if (v != value) {
				writel(v, reg);
				dev_dbg(dev, "restored pin %d val %#08x\n",
					i, v);
			}
		}
	}

	return 0;
}
#endif

#ifdef CONFIG_PM
static int byt_gpio_runtime_suspend(struct device *dev)
{
	return 0;
}

static int byt_gpio_runtime_resume(struct device *dev)
{
	return 0;
}
#endif

static const struct dev_pm_ops byt_gpio_pm_ops = {
	SET_LATE_SYSTEM_SLEEP_PM_OPS(byt_gpio_suspend, byt_gpio_resume)
	SET_RUNTIME_PM_OPS(byt_gpio_runtime_suspend, byt_gpio_runtime_resume,
			   NULL)
};

static const struct acpi_device_id byt_gpio_acpi_match[] = {
	{ "INT33B2", (kernel_ulong_t)byt_soc_data },
	{ "INT33FC", (kernel_ulong_t)byt_soc_data },
	{ }
};
MODULE_DEVICE_TABLE(acpi, byt_gpio_acpi_match);

static int byt_gpio_remove(struct platform_device *pdev)
{
	struct byt_gpio *vg = platform_get_drvdata(pdev);

	pm_runtime_disable(&pdev->dev);
	gpiochip_remove(&vg->chip);

	return 0;
}

static struct platform_driver byt_gpio_driver = {
	.probe          = byt_gpio_probe,
	.remove         = byt_gpio_remove,
	.driver         = {
		.name   = "byt_gpio",
		.pm	= &byt_gpio_pm_ops,
		.acpi_match_table = ACPI_PTR(byt_gpio_acpi_match),
	},
};

static int __init byt_gpio_init(void)
{
	return platform_driver_register(&byt_gpio_driver);
}
subsys_initcall(byt_gpio_init);

static void __exit byt_gpio_exit(void)
{
	platform_driver_unregister(&byt_gpio_driver);
}
module_exit(byt_gpio_exit);