cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpio/gpio-lpc32xx.c

Directory: drivers/gpio
/*
 * GPIO driver for LPC32xx SoC
 *
 * Author: Kevin Wells <kevin.wells@nxp.com>
 *
 * Copyright (C) 2010 NXP Semiconductors
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that 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/init.h>
#include <linux/io.h>
#include <linux/errno.h>
#include <linux/gpio.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/module.h>

#include <mach/hardware.h>
#include <mach/platform.h>


#define LPC32XX_GPIO_P3_INP_STATE		_GPREG(0x000)

#define LPC32XX_GPIO_P3_OUTP_SET		_GPREG(0x004)

#define LPC32XX_GPIO_P3_OUTP_CLR		_GPREG(0x008)

#define LPC32XX_GPIO_P3_OUTP_STATE		_GPREG(0x00C)

#define LPC32XX_GPIO_P2_DIR_SET			_GPREG(0x010)

#define LPC32XX_GPIO_P2_DIR_CLR			_GPREG(0x014)

#define LPC32XX_GPIO_P2_DIR_STATE		_GPREG(0x018)

#define LPC32XX_GPIO_P2_INP_STATE		_GPREG(0x01C)

#define LPC32XX_GPIO_P2_OUTP_SET		_GPREG(0x020)

#define LPC32XX_GPIO_P2_OUTP_CLR		_GPREG(0x024)

#define LPC32XX_GPIO_P2_MUX_SET			_GPREG(0x028)

#define LPC32XX_GPIO_P2_MUX_CLR			_GPREG(0x02C)

#define LPC32XX_GPIO_P2_MUX_STATE		_GPREG(0x030)

#define LPC32XX_GPIO_P0_INP_STATE		_GPREG(0x040)

#define LPC32XX_GPIO_P0_OUTP_SET		_GPREG(0x044)

#define LPC32XX_GPIO_P0_OUTP_CLR		_GPREG(0x048)

#define LPC32XX_GPIO_P0_OUTP_STATE		_GPREG(0x04C)

#define LPC32XX_GPIO_P0_DIR_SET			_GPREG(0x050)

#define LPC32XX_GPIO_P0_DIR_CLR			_GPREG(0x054)

#define LPC32XX_GPIO_P0_DIR_STATE		_GPREG(0x058)

#define LPC32XX_GPIO_P1_INP_STATE		_GPREG(0x060)

#define LPC32XX_GPIO_P1_OUTP_SET		_GPREG(0x064)

#define LPC32XX_GPIO_P1_OUTP_CLR		_GPREG(0x068)

#define LPC32XX_GPIO_P1_OUTP_STATE		_GPREG(0x06C)

#define LPC32XX_GPIO_P1_DIR_SET			_GPREG(0x070)

#define LPC32XX_GPIO_P1_DIR_CLR			_GPREG(0x074)

#define LPC32XX_GPIO_P1_DIR_STATE		_GPREG(0x078)


#define GPIO012_PIN_TO_BIT(x)			(1 << (x))

#define GPIO3_PIN_TO_BIT(x)			(1 << ((x) + 25))

#define GPO3_PIN_TO_BIT(x)			(1 << (x))

#define GPIO012_PIN_IN_SEL(x, y)		(((x) >> (y)) & 1)

#define GPIO3_PIN_IN_SHIFT(x)			((x) == 5 ? 24 : 10 + (x))

#define GPIO3_PIN_IN_SEL(x, y)			(((x) >> GPIO3_PIN_IN_SHIFT(y)) & 1)

#define GPIO3_PIN5_IN_SEL(x)			(((x) >> 24) & 1)

#define GPI3_PIN_IN_SEL(x, y)			(((x) >> (y)) & 1)

#define GPO3_PIN_IN_SEL(x, y)			(((x) >> (y)) & 1)


#define LPC32XX_GPIO_P0_MAX	8

#define LPC32XX_GPIO_P1_MAX	24

#define LPC32XX_GPIO_P2_MAX	13

#define LPC32XX_GPIO_P3_MAX	6

#define LPC32XX_GPI_P3_MAX	29

#define LPC32XX_GPO_P3_MAX	24


#define LPC32XX_GPIO_P0_GRP	0

#define LPC32XX_GPIO_P1_GRP	(LPC32XX_GPIO_P0_GRP + LPC32XX_GPIO_P0_MAX)

#define LPC32XX_GPIO_P2_GRP	(LPC32XX_GPIO_P1_GRP + LPC32XX_GPIO_P1_MAX)

#define LPC32XX_GPIO_P3_GRP	(LPC32XX_GPIO_P2_GRP + LPC32XX_GPIO_P2_MAX)

#define LPC32XX_GPI_P3_GRP	(LPC32XX_GPIO_P3_GRP + LPC32XX_GPIO_P3_MAX)

#define LPC32XX_GPO_P3_GRP	(LPC32XX_GPI_P3_GRP + LPC32XX_GPI_P3_MAX)


struct gpio_regs {
	
void __iomem *inp_state;
	
void __iomem *outp_state;
	
void __iomem *outp_set;
	
void __iomem *outp_clr;
	
void __iomem *dir_set;
	
void __iomem *dir_clr;
};

/*
 * GPIO names
 */

static const char *gpio_p0_names[LPC32XX_GPIO_P0_MAX] = {
	"p0.0", "p0.1", "p0.2", "p0.3",
	"p0.4", "p0.5", "p0.6", "p0.7"
};


static const char *gpio_p1_names[LPC32XX_GPIO_P1_MAX] = {
	"p1.0", "p1.1", "p1.2", "p1.3",
	"p1.4", "p1.5", "p1.6", "p1.7",
	"p1.8", "p1.9", "p1.10", "p1.11",
	"p1.12", "p1.13", "p1.14", "p1.15",
	"p1.16", "p1.17", "p1.18", "p1.19",
	"p1.20", "p1.21", "p1.22", "p1.23",
};


static const char *gpio_p2_names[LPC32XX_GPIO_P2_MAX] = {
	"p2.0", "p2.1", "p2.2", "p2.3",
	"p2.4", "p2.5", "p2.6", "p2.7",
	"p2.8", "p2.9", "p2.10", "p2.11",
	"p2.12"
};


static const char *gpio_p3_names[LPC32XX_GPIO_P3_MAX] = {
	"gpio00", "gpio01", "gpio02", "gpio03",
	"gpio04", "gpio05"
};


static const char *gpi_p3_names[LPC32XX_GPI_P3_MAX] = {
	"gpi00", "gpi01", "gpi02", "gpi03",
	"gpi04", "gpi05", "gpi06", "gpi07",
	"gpi08", "gpi09",  NULL,    NULL,
	 NULL,    NULL,    NULL,   "gpi15",
	"gpi16", "gpi17", "gpi18", "gpi19",
	"gpi20", "gpi21", "gpi22", "gpi23",
	"gpi24", "gpi25", "gpi26", "gpi27",
	"gpi28"
};


static const char *gpo_p3_names[LPC32XX_GPO_P3_MAX] = {
	"gpo00", "gpo01", "gpo02", "gpo03",
	"gpo04", "gpo05", "gpo06", "gpo07",
	"gpo08", "gpo09", "gpo10", "gpo11",
	"gpo12", "gpo13", "gpo14", "gpo15",
	"gpo16", "gpo17", "gpo18", "gpo19",
	"gpo20", "gpo21", "gpo22", "gpo23"
};


static struct gpio_regs gpio_grp_regs_p0 = {
	.inp_state	= LPC32XX_GPIO_P0_INP_STATE,
	.outp_set	= LPC32XX_GPIO_P0_OUTP_SET,
	.outp_clr	= LPC32XX_GPIO_P0_OUTP_CLR,
	.dir_set	= LPC32XX_GPIO_P0_DIR_SET,
	.dir_clr	= LPC32XX_GPIO_P0_DIR_CLR,
};


static struct gpio_regs gpio_grp_regs_p1 = {
	.inp_state	= LPC32XX_GPIO_P1_INP_STATE,
	.outp_set	= LPC32XX_GPIO_P1_OUTP_SET,
	.outp_clr	= LPC32XX_GPIO_P1_OUTP_CLR,
	.dir_set	= LPC32XX_GPIO_P1_DIR_SET,
	.dir_clr	= LPC32XX_GPIO_P1_DIR_CLR,
};


static struct gpio_regs gpio_grp_regs_p2 = {
	.inp_state	= LPC32XX_GPIO_P2_INP_STATE,
	.outp_set	= LPC32XX_GPIO_P2_OUTP_SET,
	.outp_clr	= LPC32XX_GPIO_P2_OUTP_CLR,
	.dir_set	= LPC32XX_GPIO_P2_DIR_SET,
	.dir_clr	= LPC32XX_GPIO_P2_DIR_CLR,
};


static struct gpio_regs gpio_grp_regs_p3 = {
	.inp_state	= LPC32XX_GPIO_P3_INP_STATE,
	.outp_state	= LPC32XX_GPIO_P3_OUTP_STATE,
	.outp_set	= LPC32XX_GPIO_P3_OUTP_SET,
	.outp_clr	= LPC32XX_GPIO_P3_OUTP_CLR,
	.dir_set	= LPC32XX_GPIO_P2_DIR_SET,
	.dir_clr	= LPC32XX_GPIO_P2_DIR_CLR,
};


struct lpc32xx_gpio_chip {
	
struct gpio_chip	chip;
	
struct gpio_regs	*gpio_grp;
};


static void __set_gpio_dir_p012(struct lpc32xx_gpio_chip *group, unsigned pin, int input) { if (input) __raw_writel(GPIO012_PIN_TO_BIT(pin), group->gpio_grp->dir_clr); else __raw_writel(GPIO012_PIN_TO_BIT(pin), group->gpio_grp->dir_set); }

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static void __set_gpio_dir_p3(struct lpc32xx_gpio_chip *group, unsigned pin, int input) { u32 u = GPIO3_PIN_TO_BIT(pin); if (input) __raw_writel(u, group->gpio_grp->dir_clr); else __raw_writel(u, group->gpio_grp->dir_set); }

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static void __set_gpio_level_p012(struct lpc32xx_gpio_chip *group, unsigned pin, int high) { if (high) __raw_writel(GPIO012_PIN_TO_BIT(pin), group->gpio_grp->outp_set); else __raw_writel(GPIO012_PIN_TO_BIT(pin), group->gpio_grp->outp_clr); }

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static void __set_gpio_level_p3(struct lpc32xx_gpio_chip *group, unsigned pin, int high) { u32 u = GPIO3_PIN_TO_BIT(pin); if (high) __raw_writel(u, group->gpio_grp->outp_set); else __raw_writel(u, group->gpio_grp->outp_clr); }

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static void __set_gpo_level_p3(struct lpc32xx_gpio_chip *group, unsigned pin, int high) { if (high) __raw_writel(GPO3_PIN_TO_BIT(pin), group->gpio_grp->outp_set); else __raw_writel(GPO3_PIN_TO_BIT(pin), group->gpio_grp->outp_clr); }

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static int __get_gpio_state_p012(struct lpc32xx_gpio_chip *group, unsigned pin) { return GPIO012_PIN_IN_SEL(__raw_readl(group->gpio_grp->inp_state), pin); }

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static int __get_gpio_state_p3(struct lpc32xx_gpio_chip *group, unsigned pin) { int state = __raw_readl(group->gpio_grp->inp_state); /* * P3 GPIO pin input mapping is not contiguous, GPIOP3-0..4 is mapped * to bits 10..14, while GPIOP3-5 is mapped to bit 24. */ return GPIO3_PIN_IN_SEL(state, pin); }

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static int __get_gpi_state_p3(struct lpc32xx_gpio_chip *group, unsigned pin) { return GPI3_PIN_IN_SEL(__raw_readl(group->gpio_grp->inp_state), pin); }

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static int __get_gpo_state_p3(struct lpc32xx_gpio_chip *group, unsigned pin) { return GPO3_PIN_IN_SEL(__raw_readl(group->gpio_grp->outp_state), pin); }

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/* * GPIO primitives. */
static int lpc32xx_gpio_dir_input_p012(struct gpio_chip *chip, unsigned pin) { struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); __set_gpio_dir_p012(group, pin, 1); return 0; }

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static int lpc32xx_gpio_dir_input_p3(struct gpio_chip *chip, unsigned pin) { struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); __set_gpio_dir_p3(group, pin, 1); return 0; }

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static int lpc32xx_gpio_dir_in_always(struct gpio_chip *chip, unsigned pin) { return 0; }

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static int lpc32xx_gpio_get_value_p012(struct gpio_chip *chip, unsigned pin) { struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); return !!__get_gpio_state_p012(group, pin); }

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static int lpc32xx_gpio_get_value_p3(struct gpio_chip *chip, unsigned pin) { struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); return !!__get_gpio_state_p3(group, pin); }

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static int lpc32xx_gpi_get_value(struct gpio_chip *chip, unsigned pin) { struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); return !!__get_gpi_state_p3(group, pin); }

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static int lpc32xx_gpio_dir_output_p012(struct gpio_chip *chip, unsigned pin, int value) { struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); __set_gpio_level_p012(group, pin, value); __set_gpio_dir_p012(group, pin, 0); return 0; }

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static int lpc32xx_gpio_dir_output_p3(struct gpio_chip *chip, unsigned pin, int value) { struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); __set_gpio_level_p3(group, pin, value); __set_gpio_dir_p3(group, pin, 0); return 0; }

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static int lpc32xx_gpio_dir_out_always(struct gpio_chip *chip, unsigned pin, int value) { struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); __set_gpo_level_p3(group, pin, value); return 0; }

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static void lpc32xx_gpio_set_value_p012(struct gpio_chip *chip, unsigned pin, int value) { struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); __set_gpio_level_p012(group, pin, value); }

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static void lpc32xx_gpio_set_value_p3(struct gpio_chip *chip, unsigned pin, int value) { struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); __set_gpio_level_p3(group, pin, value); }

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static void lpc32xx_gpo_set_value(struct gpio_chip *chip, unsigned pin, int value) { struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); __set_gpo_level_p3(group, pin, value); }

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static int lpc32xx_gpo_get_value(struct gpio_chip *chip, unsigned pin) { struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); return !!__get_gpo_state_p3(group, pin); }

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static int lpc32xx_gpio_request(struct gpio_chip *chip, unsigned pin) { if (pin < chip->ngpio) return 0; return -EINVAL; }

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static int lpc32xx_gpio_to_irq_p01(struct gpio_chip *chip, unsigned offset) { return -ENXIO; }

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static int lpc32xx_gpio_to_irq_gpio_p3(struct gpio_chip *chip, unsigned offset) { return -ENXIO; }

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static int lpc32xx_gpio_to_irq_gpi_p3(struct gpio_chip *chip, unsigned offset) { return -ENXIO; }

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static struct lpc32xx_gpio_chip lpc32xx_gpiochip[] = { { .chip = { .label = "gpio_p0", .direction_input = lpc32xx_gpio_dir_input_p012, .get = lpc32xx_gpio_get_value_p012, .direction_output = lpc32xx_gpio_dir_output_p012, .set = lpc32xx_gpio_set_value_p012, .request = lpc32xx_gpio_request, .to_irq = lpc32xx_gpio_to_irq_p01, .base = LPC32XX_GPIO_P0_GRP, .ngpio = LPC32XX_GPIO_P0_MAX, .names = gpio_p0_names, .can_sleep = false, }, .gpio_grp = &gpio_grp_regs_p0, }, { .chip = { .label = "gpio_p1", .direction_input = lpc32xx_gpio_dir_input_p012, .get = lpc32xx_gpio_get_value_p012, .direction_output = lpc32xx_gpio_dir_output_p012, .set = lpc32xx_gpio_set_value_p012, .request = lpc32xx_gpio_request, .to_irq = lpc32xx_gpio_to_irq_p01, .base = LPC32XX_GPIO_P1_GRP, .ngpio = LPC32XX_GPIO_P1_MAX, .names = gpio_p1_names, .can_sleep = false, }, .gpio_grp = &gpio_grp_regs_p1, }, { .chip = { .label = "gpio_p2", .direction_input = lpc32xx_gpio_dir_input_p012, .get = lpc32xx_gpio_get_value_p012, .direction_output = lpc32xx_gpio_dir_output_p012, .set = lpc32xx_gpio_set_value_p012, .request = lpc32xx_gpio_request, .base = LPC32XX_GPIO_P2_GRP, .ngpio = LPC32XX_GPIO_P2_MAX, .names = gpio_p2_names, .can_sleep = false, }, .gpio_grp = &gpio_grp_regs_p2, }, { .chip = { .label = "gpio_p3", .direction_input = lpc32xx_gpio_dir_input_p3, .get = lpc32xx_gpio_get_value_p3, .direction_output = lpc32xx_gpio_dir_output_p3, .set = lpc32xx_gpio_set_value_p3, .request = lpc32xx_gpio_request, .to_irq = lpc32xx_gpio_to_irq_gpio_p3, .base = LPC32XX_GPIO_P3_GRP, .ngpio = LPC32XX_GPIO_P3_MAX, .names = gpio_p3_names, .can_sleep = false, }, .gpio_grp = &gpio_grp_regs_p3, }, { .chip = { .label = "gpi_p3", .direction_input = lpc32xx_gpio_dir_in_always, .get = lpc32xx_gpi_get_value, .request = lpc32xx_gpio_request, .to_irq = lpc32xx_gpio_to_irq_gpi_p3, .base = LPC32XX_GPI_P3_GRP, .ngpio = LPC32XX_GPI_P3_MAX, .names = gpi_p3_names, .can_sleep = false, }, .gpio_grp = &gpio_grp_regs_p3, }, { .chip = { .label = "gpo_p3", .direction_output = lpc32xx_gpio_dir_out_always, .set = lpc32xx_gpo_set_value, .get = lpc32xx_gpo_get_value, .request = lpc32xx_gpio_request, .base = LPC32XX_GPO_P3_GRP, .ngpio = LPC32XX_GPO_P3_MAX, .names = gpo_p3_names, .can_sleep = false, }, .gpio_grp = &gpio_grp_regs_p3, }, };
static int lpc32xx_of_xlate(struct gpio_chip *gc, const struct of_phandle_args *gpiospec, u32 *flags) { /* Is this the correct bank? */ u32 bank = gpiospec->args[0]; if ((bank >= ARRAY_SIZE(lpc32xx_gpiochip) || (gc != &lpc32xx_gpiochip[bank].chip))) return -EINVAL; if (flags) *flags = gpiospec->args[2]; return gpiospec->args[1]; }

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static int lpc32xx_gpio_probe(struct platform_device *pdev) { int i; for (i = 0; i < ARRAY_SIZE(lpc32xx_gpiochip); i++) { if (pdev->dev.of_node) { lpc32xx_gpiochip[i].chip.of_xlate = lpc32xx_of_xlate; lpc32xx_gpiochip[i].chip.of_gpio_n_cells = 3; lpc32xx_gpiochip[i].chip.of_node = pdev->dev.of_node; } devm_gpiochip_add_data(&pdev->dev, &lpc32xx_gpiochip[i].chip, &lpc32xx_gpiochip[i]); } return 0; }

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#ifdef CONFIG_OF static const struct of_device_id lpc32xx_gpio_of_match[] = { { .compatible = "nxp,lpc3220-gpio", }, { }, }; #endif static struct platform_driver lpc32xx_gpio_driver = { .driver = { .name = "lpc32xx-gpio", .of_match_table = of_match_ptr(lpc32xx_gpio_of_match), }, .probe = lpc32xx_gpio_probe, }; module_platform_driver(lpc32xx_gpio_driver);

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Sachin Kamat30.13%14.76%
Sylvain Lemieux20.09%14.76%
Alexandre Courbot10.04%14.76%
Jingoo Han10.04%14.76%
Axel Lin10.04%14.76%
Bill Pemberton0.00%00.00%
Total2280100.00%21100.00%
Directory: drivers/gpio
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