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linux-next/drivers/gpio/gpio-lpc32xx.c
Roland Stigge 46158aad96 GPIO: LPC32xx: Add output reading to GPO P3 
The chip offers the function to detect the current state of output of the GPO
P3 pins. Useful for reading GPIO output state in Linux' GPIO API, e.g. via
sysfs.

Please note that this only reads back the currently programmed output state,
not the actual electrical level in terms of a GPI function. Finally, GPO3 is
still just an output.

Signed-off-by: Roland Stigge <stigge@antcom.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2012-03-12 11:25:30 -06:00

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/*
* arch/arm/mach-lpc32xx/gpiolib.c
*
* 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 <mach/hardware.h>
#include <mach/platform.h>
#include <mach/gpio-lpc32xx.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)
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"
};
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 inline struct lpc32xx_gpio_chip *to_lpc32xx_gpio(
struct gpio_chip *gpc)
{
return container_of(gpc, struct lpc32xx_gpio_chip, chip);
}
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);
}
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);
}
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);
}
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);
}
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);
}
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);
}
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);
}
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);
}
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);
}
/*
* GENERIC_GPIO primitives.
*/
static int lpc32xx_gpio_dir_input_p012(struct gpio_chip *chip,
unsigned pin)
{
struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
__set_gpio_dir_p012(group, pin, 1);
return 0;
}
static int lpc32xx_gpio_dir_input_p3(struct gpio_chip *chip,
unsigned pin)
{
struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
__set_gpio_dir_p3(group, pin, 1);
return 0;
}
static int lpc32xx_gpio_dir_in_always(struct gpio_chip *chip,
unsigned pin)
{
return 0;
}
static int lpc32xx_gpio_get_value_p012(struct gpio_chip *chip, unsigned pin)
{
struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
return __get_gpio_state_p012(group, pin);
}
static int lpc32xx_gpio_get_value_p3(struct gpio_chip *chip, unsigned pin)
{
struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
return __get_gpio_state_p3(group, pin);
}
static int lpc32xx_gpi_get_value(struct gpio_chip *chip, unsigned pin)
{
struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
return __get_gpi_state_p3(group, pin);
}
static int lpc32xx_gpio_dir_output_p012(struct gpio_chip *chip, unsigned pin,
int value)
{
struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
__set_gpio_dir_p012(group, pin, 0);
return 0;
}
static int lpc32xx_gpio_dir_output_p3(struct gpio_chip *chip, unsigned pin,
int value)
{
struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
__set_gpio_dir_p3(group, pin, 0);
return 0;
}
static int lpc32xx_gpio_dir_out_always(struct gpio_chip *chip, unsigned pin,
int value)
{
return 0;
}
static void lpc32xx_gpio_set_value_p012(struct gpio_chip *chip, unsigned pin,
int value)
{
struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
__set_gpio_level_p012(group, pin, value);
}
static void lpc32xx_gpio_set_value_p3(struct gpio_chip *chip, unsigned pin,
int value)
{
struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
__set_gpio_level_p3(group, pin, value);
}
static void lpc32xx_gpo_set_value(struct gpio_chip *chip, unsigned pin,
int value)
{
struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
__set_gpo_level_p3(group, pin, value);
}
static int lpc32xx_gpo_get_value(struct gpio_chip *chip, unsigned pin)
{
struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
return __get_gpo_state_p3(group, pin);
}
static int lpc32xx_gpio_request(struct gpio_chip *chip, unsigned pin)
{
if (pin < chip->ngpio)
return 0;
return -EINVAL;
}
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,
.base = LPC32XX_GPIO_P0_GRP,
.ngpio = LPC32XX_GPIO_P0_MAX,
.names = gpio_p0_names,
.can_sleep = 0,
},
.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,
.base = LPC32XX_GPIO_P1_GRP,
.ngpio = LPC32XX_GPIO_P1_MAX,
.names = gpio_p1_names,
.can_sleep = 0,
},
.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 = 0,
},
.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,
.base = LPC32XX_GPIO_P3_GRP,
.ngpio = LPC32XX_GPIO_P3_MAX,
.names = gpio_p3_names,
.can_sleep = 0,
},
.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,
.base = LPC32XX_GPI_P3_GRP,
.ngpio = LPC32XX_GPI_P3_MAX,
.names = gpi_p3_names,
.can_sleep = 0,
},
.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 = 0,
},
.gpio_grp = &gpio_grp_regs_p3,
},
};
void __init lpc32xx_gpio_init(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(lpc32xx_gpiochip); i++)
gpiochip_add(&lpc32xx_gpiochip[i].chip);
}
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