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kernel_samsung_a34x-permissive/drivers/pinctrl/intel/pinctrl-baytrail.c

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Import A346BXXU1AWB9 kernel source Android 13
2024-04-28 06:49:01 -07:00
// SPDX-License-Identifier: GPL-2.0
/*
* Pinctrl GPIO driver for Intel Baytrail
*
* Copyright (c) 2012-2013, Intel Corporation
* Author: Mathias Nyman <mathias.nyman@linux.intel.com>
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/interrupt.h>
#include <linux/gpio.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
#define BYT_DEBOUNCE_REG 0x9d0
/* 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_DEBOUNCE_EN BIT(20)
#define BYT_GLITCH_FILTER_EN BIT(19)
#define BYT_GLITCH_F_SLOW_CLK BIT(17)
#define BYT_GLITCH_F_FAST_CLK BIT(16)
#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)
/* BYT_DEBOUNCE_REG bits */
#define BYT_DEBOUNCE_PULSE_MASK 0x7
#define BYT_DEBOUNCE_PULSE_375US 1
#define BYT_DEBOUNCE_PULSE_750US 2
#define BYT_DEBOUNCE_PULSE_1500US 3
#define BYT_DEBOUNCE_PULSE_3MS 4
#define BYT_DEBOUNCE_PULSE_6MS 5
#define BYT_DEBOUNCE_PULSE_12MS 6
#define BYT_DEBOUNCE_PULSE_24MS 7
#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;
};
struct byt_gpio {
struct gpio_chip chip;
struct platform_device *pdev;
struct pinctrl_dev *pctl_dev;
struct pinctrl_desc pctl_desc;
const struct byt_pinctrl_soc_data *soc_data;
struct byt_community *communities_copy;
struct byt_gpio_pin_context *saved_context;
};
/* 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 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_clk3_pins[] = { 99 };
static const unsigned int byt_score_plt_clk4_pins[] = { 100 };
static const unsigned int byt_score_plt_clk5_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 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 const struct byt_pinctrl_soc_data *byt_soc_data[] = {
&byt_score_soc_data,
&byt_sus_soc_data,
&byt_ncore_soc_data,
NULL,
};
static DEFINE_RAW_SPINLOCK(byt_lock);
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;
if (!comm)
return NULL;
offset -= comm->pin_base;
switch (reg) {
case BYT_INT_STAT_REG:
reg_offset = (offset / 32) * 4;
break;
case BYT_DEBOUNCE_REG:
reg_offset = 0;
break;
default:
reg_offset = comm->pad_map[offset] * 16;
break;
}
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(&byt_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(&byt_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(&byt_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(&byt_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(&byt_lock, flags);
value = readl(reg);
/* Do not clear direct-irq enabled IRQs (from gpio_disable_free) */
if (value & BYT_DIRECT_IRQ_EN)
/* nothing to do */ ;
else
value &= ~(BYT_TRIG_POS | BYT_TRIG_NEG | BYT_TRIG_LVL);
writel(value, reg);
raw_spin_unlock_irqrestore(&byt_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(&byt_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 (gpio_mux != value) {
value = readl(reg) & ~BYT_PIN_MUX;
value |= gpio_mux;
writel(value, reg);
dev_warn(&vg->pdev->dev, FW_BUG
"pin %u forcibly re-configured as GPIO\n", offset);
}
raw_spin_unlock_irqrestore(&byt_lock, flags);
pm_runtime_get(&vg->pdev->dev);
return 0;
}
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 void byt_gpio_direct_irq_check(struct byt_gpio *vg,
unsigned int offset)
{
void __iomem *conf_reg = byt_gpio_reg(vg, offset, BYT_CONF0_REG);
/*
* Before making any direction modifications, do a check if gpio is set
* for direct IRQ. On Bay Trail, setting GPIO to output does not make
* sense, so let's at least inform the caller before they shoot
* themselves in the foot.
*/
if (readl(conf_reg) & BYT_DIRECT_IRQ_EN)
dev_info_once(&vg->pdev->dev, "Potential Error: Setting GPIO with direct_irq_en to output");
}
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);
unsigned long flags;
u32 value;
raw_spin_lock_irqsave(&byt_lock, flags);
value = readl(val_reg);
value &= ~BYT_DIR_MASK;
if (input)
value |= BYT_OUTPUT_EN;
else
byt_gpio_direct_irq_check(vg, offset);
writel(value, val_reg);
raw_spin_unlock_irqrestore(&byt_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 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);
void __iomem *db_reg = byt_gpio_reg(vg, offset, BYT_DEBOUNCE_REG);
unsigned long flags;
u32 conf, pull, val, debounce;
u16 arg = 0;
raw_spin_lock_irqsave(&byt_lock, flags);
conf = readl(conf_reg);
pull = conf & BYT_PULL_ASSIGN_MASK;
val = readl(val_reg);
raw_spin_unlock_irqrestore(&byt_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;
case PIN_CONFIG_INPUT_DEBOUNCE:
if (!(conf & BYT_DEBOUNCE_EN))
return -EINVAL;
raw_spin_lock_irqsave(&byt_lock, flags);
debounce = readl(db_reg);
raw_spin_unlock_irqrestore(&byt_lock, flags);
switch (debounce & BYT_DEBOUNCE_PULSE_MASK) {
case BYT_DEBOUNCE_PULSE_375US:
arg = 375;
break;
case BYT_DEBOUNCE_PULSE_750US:
arg = 750;
break;
case BYT_DEBOUNCE_PULSE_1500US:
arg = 1500;
break;
case BYT_DEBOUNCE_PULSE_3MS:
arg = 3000;
break;
case BYT_DEBOUNCE_PULSE_6MS:
arg = 6000;
break;
case BYT_DEBOUNCE_PULSE_12MS:
arg = 12000;
break;
case BYT_DEBOUNCE_PULSE_24MS:
arg = 24000;
break;
default:
return -EINVAL;
}
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);
void __iomem *db_reg = byt_gpio_reg(vg, offset, BYT_DEBOUNCE_REG);
unsigned long flags;
u32 conf, val, debounce;
int i, ret = 0;
raw_spin_lock_irqsave(&byt_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;
case PIN_CONFIG_INPUT_DEBOUNCE:
debounce = readl(db_reg);
if (arg)
conf |= BYT_DEBOUNCE_EN;
else
conf &= ~BYT_DEBOUNCE_EN;
switch (arg) {
case 375:
debounce &= ~BYT_DEBOUNCE_PULSE_MASK;
debounce |= BYT_DEBOUNCE_PULSE_375US;
break;
case 750:
debounce &= ~BYT_DEBOUNCE_PULSE_MASK;
debounce |= BYT_DEBOUNCE_PULSE_750US;
break;
case 1500:
debounce &= ~BYT_DEBOUNCE_PULSE_MASK;
debounce |= BYT_DEBOUNCE_PULSE_1500US;
break;
case 3000:
debounce &= ~BYT_DEBOUNCE_PULSE_MASK;
debounce |= BYT_DEBOUNCE_PULSE_3MS;
break;
case 6000:
debounce &= ~BYT_DEBOUNCE_PULSE_MASK;
debounce |= BYT_DEBOUNCE_PULSE_6MS;
break;
case 12000:
debounce &= ~BYT_DEBOUNCE_PULSE_MASK;
debounce |= BYT_DEBOUNCE_PULSE_12MS;
break;
case 24000:
debounce &= ~BYT_DEBOUNCE_PULSE_MASK;
debounce |= BYT_DEBOUNCE_PULSE_24MS;
break;
default:
if (arg)
ret = -EINVAL;
break;
}
if (!ret)
writel(debounce, db_reg);
break;
default:
ret = -ENOTSUPP;
}
if (ret)
break;
}
if (!ret)
writel(conf, conf_reg);
raw_spin_unlock_irqrestore(&byt_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(&byt_lock, flags);
val = readl(reg);
raw_spin_unlock_irqrestore(&byt_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;
if (!reg)
return;
raw_spin_lock_irqsave(&byt_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(&byt_lock, flags);
}
static int byt_gpio_get_direction(struct gpio_chip *chip, unsigned int 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;
if (!reg)
return -EINVAL;
raw_spin_lock_irqsave(&byt_lock, flags);
value = readl(reg);
raw_spin_unlock_irqrestore(&byt_lock, flags);
if (!(value & BYT_OUTPUT_EN))
return GPIOF_DIR_OUT;
if (!(value & BYT_INPUT_EN))
return GPIOF_DIR_IN;
return -EINVAL;
}
static int byt_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
{
struct byt_gpio *vg = gpiochip_get_data(chip);
void __iomem *val_reg = byt_gpio_reg(vg, offset, BYT_VAL_REG);
unsigned long flags;
u32 reg;
raw_spin_lock_irqsave(&byt_lock, flags);
reg = readl(val_reg);
reg &= ~BYT_DIR_MASK;
reg |= BYT_OUTPUT_EN;
writel(reg, val_reg);
raw_spin_unlock_irqrestore(&byt_lock, flags);
return 0;
}
/*
* Note despite the temptation this MUST NOT be converted into a call to
* pinctrl_gpio_direction_output() + byt_gpio_set() that does not work this
* MUST be done as a single BYT_VAL_REG register write.
* See the commit message of the commit adding this comment for details.
*/
static int byt_gpio_direction_output(struct gpio_chip *chip,
unsigned int offset, int value)
{
struct byt_gpio *vg = gpiochip_get_data(chip);
void __iomem *val_reg = byt_gpio_reg(vg, offset, BYT_VAL_REG);
unsigned long flags;
u32 reg;
raw_spin_lock_irqsave(&byt_lock, flags);
byt_gpio_direct_irq_check(vg, offset);
reg = readl(val_reg);
reg &= ~BYT_DIR_MASK;
if (value)
reg |= BYT_LEVEL;
else
reg &= ~BYT_LEVEL;
writel(reg, val_reg);
raw_spin_unlock_irqrestore(&byt_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;
for (i = 0; i < vg->soc_data->npins; i++) {
const struct byt_community *comm;
const char *pull_str = NULL;
const char *pull = NULL;
void __iomem *reg;
unsigned long flags;
const char *label;
unsigned int pin;
raw_spin_lock_irqsave(&byt_lock, flags);
pin = vg->soc_data->pins[i].number;
reg = byt_gpio_reg(vg, pin, BYT_CONF0_REG);
if (!reg) {
seq_printf(s,
"Could not retrieve pin %i conf0 reg\n",
pin);
raw_spin_unlock_irqrestore(&byt_lock, flags);
continue;
}
conf0 = readl(reg);
reg = byt_gpio_reg(vg, pin, BYT_VAL_REG);
if (!reg) {
seq_printf(s,
"Could not retrieve pin %i val reg\n", pin);
raw_spin_unlock_irqrestore(&byt_lock, flags);
continue;
}
val = readl(reg);
raw_spin_unlock_irqrestore(&byt_lock, flags);
comm = byt_get_community(vg, pin);
if (!comm) {
seq_printf(s,
"Could not get community for pin %i\n", pin);
continue;
}
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",
pin,
label,
val & BYT_INPUT_EN ? " " : "in",
val & BYT_OUTPUT_EN ? " " : "out",
val & BYT_LEVEL ? "hi" : "lo",
comm->pad_map[i], comm->pad_map[i] * 16,
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 const struct gpio_chip byt_gpio_chip = {
.owner = THIS_MODULE,
.request = gpiochip_generic_request,
.free = gpiochip_generic_free,
.get_direction = byt_gpio_get_direction,
.direction_input = byt_gpio_direction_input,
.direction_output = byt_gpio_direction_output,
.get = byt_gpio_get,
.set = byt_gpio_set,
.set_config = gpiochip_generic_config,
.dbg_show = byt_gpio_dbg_show,
};
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;
reg = byt_gpio_reg(vg, offset, BYT_INT_STAT_REG);
if (!reg)
return;
raw_spin_lock(&byt_lock);
writel(BIT(offset % 32), reg);
raw_spin_unlock(&byt_lock);
}
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 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);
if (!reg)
return;
raw_spin_lock_irqsave(&byt_lock, flags);
value = readl(reg);
switch (irqd_get_trigger_type(d)) {
case IRQ_TYPE_LEVEL_HIGH:
value |= BYT_TRIG_LVL;
/* fall through */
case IRQ_TYPE_EDGE_RISING:
value |= BYT_TRIG_POS;
break;
case IRQ_TYPE_LEVEL_LOW:
value |= BYT_TRIG_LVL;
/* fall through */
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(&byt_lock, flags);
}
static int byt_irq_type(struct irq_data *d, unsigned int 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 (!reg || offset >= vg->chip.ngpio)
return -EINVAL;
raw_spin_lock_irqsave(&byt_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);
/* Enable glitch filtering */
value |= BYT_GLITCH_FILTER_EN | BYT_GLITCH_F_SLOW_CLK |
BYT_GLITCH_F_FAST_CLK;
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(&byt_lock, flags);
return 0;
}
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_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 int 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);
if (!reg) {
dev_warn(&vg->pdev->dev,
"Pin %i: could not retrieve interrupt status register\n",
base);
continue;
}
raw_spin_lock(&byt_lock);
pending = readl(reg);
raw_spin_unlock(&byt_lock);
for_each_set_bit(pin, &pending, 32) {
virq = irq_find_mapping(vg->chip.irq.domain, base + pin);
generic_handle_irq(virq);
}
}
chip->irq_eoi(data);
}
static void byt_gpio_irq_init_hw(struct byt_gpio *vg)
{
struct gpio_chip *gc = &vg->chip;
struct device *dev = &vg->pdev->dev;
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->soc_data->npins; i++) {
unsigned int pin = vg->soc_data->pins[i].number;
reg = byt_gpio_reg(vg, pin, BYT_CONF0_REG);
if (!reg) {
dev_warn(&vg->pdev->dev,
"Pin %i: could not retrieve conf0 register\n",
i);
continue;
}
value = readl(reg);
if (value & BYT_DIRECT_IRQ_EN) {
clear_bit(i, gc->irq.valid_mask);
dev_dbg(dev, "excluding GPIO %d from IRQ domain\n", i);
} else if ((value & BYT_PIN_MUX) == byt_get_gpio_mux(vg, i)) {
byt_gpio_clear_triggering(vg, i);
dev_dbg(dev, "disabling GPIO %d\n", i);
}
}
/* clear interrupt status trigger registers */
for (base = 0; base < vg->soc_data->npins; base += 32) {
reg = byt_gpio_reg(vg, base, BYT_INT_STAT_REG);
if (!reg) {
dev_warn(&vg->pdev->dev,
"Pin %i: could not retrieve irq status reg\n",
base);
continue;
}
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. INT_STAT%u: 0x%08x\n",
base / 32, value);
}
}
static int byt_gpio_probe(struct byt_gpio *vg)
{
struct gpio_chip *gc;
struct resource *irq_rc;
int ret;
/* Set up gpio chip */
vg->chip = byt_gpio_chip;
gc = &vg->chip;
gc->label = dev_name(&vg->pdev->dev);
gc->base = -1;
gc->can_sleep = false;
gc->parent = &vg->pdev->dev;
gc->ngpio = vg->soc_data->npins;
gc->irq.need_valid_mask = true;
#ifdef CONFIG_PM_SLEEP
vg->saved_context = devm_kcalloc(&vg->pdev->dev, gc->ngpio,
sizeof(*vg->saved_context), GFP_KERNEL);
#endif
ret = devm_gpiochip_add_data(&vg->pdev->dev, gc, vg);
if (ret) {
dev_err(&vg->pdev->dev, "failed adding byt-gpio chip\n");
return ret;
}
ret = gpiochip_add_pin_range(&vg->chip, dev_name(&vg->pdev->dev),
0, 0, vg->soc_data->npins);
if (ret) {
dev_err(&vg->pdev->dev, "failed to add GPIO pin range\n");
return ret;
}
/* set up interrupts */
irq_rc = platform_get_resource(vg->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_bad_irq, IRQ_TYPE_NONE);
if (ret) {
dev_err(&vg->pdev->dev, "failed to add irqchip\n");
return ret;
}
gpiochip_set_chained_irqchip(gc, &byt_irqchip,
(unsigned)irq_rc->start,
byt_gpio_irq_handler);
}
return ret;
}
static int byt_set_soc_data(struct byt_gpio *vg,
const struct byt_pinctrl_soc_data *soc_data)
{
int i;
vg->soc_data = soc_data;
vg->communities_copy = devm_kcalloc(&vg->pdev->dev,
soc_data->ncommunities,
sizeof(*vg->communities_copy),
GFP_KERNEL);
if (!vg->communities_copy)
return -ENOMEM;
for (i = 0; i < soc_data->ncommunities; i++) {
struct byt_community *comm = vg->communities_copy + i;
struct resource *mem_rc;
*comm = vg->soc_data->communities[i];
mem_rc = platform_get_resource(vg->pdev, IORESOURCE_MEM, 0);
comm->reg_base = devm_ioremap_resource(&vg->pdev->dev, mem_rc);
if (IS_ERR(comm->reg_base))
return PTR_ERR(comm->reg_base);
}
return 0;
}
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_pinctrl_probe(struct platform_device *pdev)
{
const struct byt_pinctrl_soc_data *soc_data = NULL;
const struct byt_pinctrl_soc_data **soc_table;
const struct acpi_device_id *acpi_id;
struct acpi_device *acpi_dev;
struct byt_gpio *vg;
int i, ret;
acpi_dev = ACPI_COMPANION(&pdev->dev);
if (!acpi_dev)
return -ENODEV;
acpi_id = acpi_match_device(byt_gpio_acpi_match, &pdev->dev);
if (!acpi_id)
return -ENODEV;
soc_table = (const struct byt_pinctrl_soc_data **)acpi_id->driver_data;
for (i = 0; soc_table[i]; i++) {
if (!strcmp(acpi_dev->pnp.unique_id, soc_table[i]->uid)) {
soc_data = soc_table[i];
break;
}
}
if (!soc_data)
return -ENODEV;
vg = devm_kzalloc(&pdev->dev, sizeof(*vg), GFP_KERNEL);
if (!vg)
return -ENOMEM;
vg->pdev = pdev;
ret = byt_set_soc_data(vg, soc_data);
if (ret) {
dev_err(&pdev->dev, "failed to set soc data\n");
return ret;
}
vg->pctl_desc = byt_pinctrl_desc;
vg->pctl_desc.name = dev_name(&pdev->dev);
vg->pctl_desc.pins = vg->soc_data->pins;
vg->pctl_desc.npins = vg->soc_data->npins;
vg->pctl_dev = devm_pinctrl_register(&pdev->dev, &vg->pctl_desc, vg);
if (IS_ERR(vg->pctl_dev)) {
dev_err(&pdev->dev, "failed to register pinctrl driver\n");
return PTR_ERR(vg->pctl_dev);
}
ret = byt_gpio_probe(vg);
if (ret)
return ret;
platform_set_drvdata(pdev, vg);
pm_runtime_enable(&pdev->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);
unsigned long flags;
int i;
raw_spin_lock_irqsave(&byt_lock, flags);
for (i = 0; i < vg->soc_data->npins; i++) {
void __iomem *reg;
u32 value;
unsigned int pin = vg->soc_data->pins[i].number;
reg = byt_gpio_reg(vg, pin, BYT_CONF0_REG);
if (!reg) {
dev_warn(&vg->pdev->dev,
"Pin %i: could not retrieve conf0 register\n",
i);
continue;
}
value = readl(reg) & BYT_CONF0_RESTORE_MASK;
vg->saved_context[i].conf0 = value;
reg = byt_gpio_reg(vg, pin, BYT_VAL_REG);
value = readl(reg) & BYT_VAL_RESTORE_MASK;
vg->saved_context[i].val = value;
}
raw_spin_unlock_irqrestore(&byt_lock, flags);
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);
unsigned long flags;
int i;
raw_spin_lock_irqsave(&byt_lock, flags);
for (i = 0; i < vg->soc_data->npins; i++) {
void __iomem *reg;
u32 value;
unsigned int pin = vg->soc_data->pins[i].number;
reg = byt_gpio_reg(vg, pin, BYT_CONF0_REG);
if (!reg) {
dev_warn(&vg->pdev->dev,
"Pin %i: could not retrieve conf0 register\n",
i);
continue;
}
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, pin, 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);
}
}
}
raw_spin_unlock_irqrestore(&byt_lock, flags);
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 struct platform_driver byt_gpio_driver = {
.probe = byt_pinctrl_probe,
.driver = {
.name = "byt_gpio",
.pm = &byt_gpio_pm_ops,
.suppress_bind_attrs = true,
.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);
Reference in a new issue Copy permalink