Linux-2.6.33.2/arch/arm/plat-s5pc1xx/gpiolib.c
/*
* arch/arm/plat-s5pc1xx/gpiolib.c
*
* Copyright 2009 Samsung Electronics Co
* Kyungmin Park <kyungmin.park@samsung.com>
*
* S5PC1XX - GPIOlib support
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <mach/map.h>
#include <mach/gpio-core.h>
#include <plat/gpio-cfg.h>
#include <plat/gpio-cfg-helpers.h>
#include <plat/regs-gpio.h>
/* S5PC100 GPIO bank summary:
*
* Bank GPIOs Style INT Type
* A0 8 4Bit GPIO_INT0
* A1 5 4Bit GPIO_INT1
* B 8 4Bit GPIO_INT2
* C 5 4Bit GPIO_INT3
* D 7 4Bit GPIO_INT4
* E0 8 4Bit GPIO_INT5
* E1 6 4Bit GPIO_INT6
* F0 8 4Bit GPIO_INT7
* F1 8 4Bit GPIO_INT8
* F2 8 4Bit GPIO_INT9
* F3 4 4Bit GPIO_INT10
* G0 8 4Bit GPIO_INT11
* G1 3 4Bit GPIO_INT12
* G2 7 4Bit GPIO_INT13
* G3 7 4Bit GPIO_INT14
* H0 8 4Bit WKUP_INT
* H1 8 4Bit WKUP_INT
* H2 8 4Bit WKUP_INT
* H3 8 4Bit WKUP_INT
* I 8 4Bit GPIO_INT15
* J0 8 4Bit GPIO_INT16
* J1 5 4Bit GPIO_INT17
* J2 8 4Bit GPIO_INT18
* J3 8 4Bit GPIO_INT19
* J4 4 4Bit GPIO_INT20
* K0 8 4Bit None
* K1 6 4Bit None
* K2 8 4Bit None
* K3 8 4Bit None
* L0 8 4Bit None
* L1 8 4Bit None
* L2 8 4Bit None
* L3 8 4Bit None
*/
#define OFF_GPCON (0x00)
#define OFF_GPDAT (0x04)
#define con_4bit_shift(__off) ((__off) * 4)
#if 1
#define gpio_dbg(x...) do { } while (0)
#else
#define gpio_dbg(x...) printk(KERN_DEBUG x)
#endif
/* The s5pc1xx_gpiolib routines are to control the gpio banks where
* the gpio configuration register (GPxCON) has 4 bits per GPIO, as the
* following example:
*
* base + 0x00: Control register, 4 bits per gpio
* gpio n: 4 bits starting at (4*n)
* 0000 = input, 0001 = output, others mean special-function
* base + 0x04: Data register, 1 bit per gpio
* bit n: data bit n
*
* Note, since the data register is one bit per gpio and is at base + 0x4
* we can use s3c_gpiolib_get and s3c_gpiolib_set to change the state of
* the output.
*/
static int s5pc1xx_gpiolib_input(struct gpio_chip *chip, unsigned offset)
{
struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
void __iomem *base = ourchip->base;
unsigned long con;
con = __raw_readl(base + OFF_GPCON);
con &= ~(0xf << con_4bit_shift(offset));
__raw_writel(con, base + OFF_GPCON);
gpio_dbg("%s: %p: CON now %08lx\n", __func__, base, con);
return 0;
}
static int s5pc1xx_gpiolib_output(struct gpio_chip *chip,
unsigned offset, int value)
{
struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
void __iomem *base = ourchip->base;
unsigned long con;
unsigned long dat;
con = __raw_readl(base + OFF_GPCON);
con &= ~(0xf << con_4bit_shift(offset));
con |= 0x1 << con_4bit_shift(offset);
dat = __raw_readl(base + OFF_GPDAT);
if (value)
dat |= 1 << offset;
else
dat &= ~(1 << offset);
__raw_writel(dat, base + OFF_GPDAT);
__raw_writel(con, base + OFF_GPCON);
__raw_writel(dat, base + OFF_GPDAT);
gpio_dbg("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);
return 0;
}
static int s5pc1xx_gpiolib_to_irq(struct gpio_chip *chip, unsigned int offset)
{
return S3C_IRQ_GPIO(chip->base + offset);
}
static int s5pc1xx_gpiolib_to_eint(struct gpio_chip *chip, unsigned int offset)
{
int base;
base = chip->base - S5PC100_GPH0(0);
if (base == 0)
return IRQ_EINT(offset);
base = chip->base - S5PC100_GPH1(0);
if (base == 0)
return IRQ_EINT(8 + offset);
base = chip->base - S5PC100_GPH2(0);
if (base == 0)
return IRQ_EINT(16 + offset);
base = chip->base - S5PC100_GPH3(0);
if (base == 0)
return IRQ_EINT(24 + offset);
return -EINVAL;
}
static struct s3c_gpio_cfg gpio_cfg = {
.set_config = s3c_gpio_setcfg_s3c64xx_4bit,
.set_pull = s3c_gpio_setpull_updown,
.get_pull = s3c_gpio_getpull_updown,
};
static struct s3c_gpio_cfg gpio_cfg_eint = {
.cfg_eint = 0xf,
.set_config = s3c_gpio_setcfg_s3c64xx_4bit,
.set_pull = s3c_gpio_setpull_updown,
.get_pull = s3c_gpio_getpull_updown,
};
static struct s3c_gpio_cfg gpio_cfg_noint = {
.set_config = s3c_gpio_setcfg_s3c64xx_4bit,
.set_pull = s3c_gpio_setpull_updown,
.get_pull = s3c_gpio_getpull_updown,
};
static struct s3c_gpio_chip s5pc100_gpio_chips[] = {
{
.base = S5PC100_GPA0_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPA0(0),
.ngpio = S5PC100_GPIO_A0_NR,
.label = "GPA0",
},
}, {
.base = S5PC100_GPA1_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPA1(0),
.ngpio = S5PC100_GPIO_A1_NR,
.label = "GPA1",
},
}, {
.base = S5PC100_GPB_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPB(0),
.ngpio = S5PC100_GPIO_B_NR,
.label = "GPB",
},
}, {
.base = S5PC100_GPC_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPC(0),
.ngpio = S5PC100_GPIO_C_NR,
.label = "GPC",
},
}, {
.base = S5PC100_GPD_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPD(0),
.ngpio = S5PC100_GPIO_D_NR,
.label = "GPD",
},
}, {
.base = S5PC100_GPE0_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPE0(0),
.ngpio = S5PC100_GPIO_E0_NR,
.label = "GPE0",
},
}, {
.base = S5PC100_GPE1_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPE1(0),
.ngpio = S5PC100_GPIO_E1_NR,
.label = "GPE1",
},
}, {
.base = S5PC100_GPF0_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPF0(0),
.ngpio = S5PC100_GPIO_F0_NR,
.label = "GPF0",
},
}, {
.base = S5PC100_GPF1_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPF1(0),
.ngpio = S5PC100_GPIO_F1_NR,
.label = "GPF1",
},
}, {
.base = S5PC100_GPF2_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPF2(0),
.ngpio = S5PC100_GPIO_F2_NR,
.label = "GPF2",
},
}, {
.base = S5PC100_GPF3_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPF3(0),
.ngpio = S5PC100_GPIO_F3_NR,
.label = "GPF3",
},
}, {
.base = S5PC100_GPG0_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPG0(0),
.ngpio = S5PC100_GPIO_G0_NR,
.label = "GPG0",
},
}, {
.base = S5PC100_GPG1_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPG1(0),
.ngpio = S5PC100_GPIO_G1_NR,
.label = "GPG1",
},
}, {
.base = S5PC100_GPG2_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPG2(0),
.ngpio = S5PC100_GPIO_G2_NR,
.label = "GPG2",
},
}, {
.base = S5PC100_GPG3_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPG3(0),
.ngpio = S5PC100_GPIO_G3_NR,
.label = "GPG3",
},
}, {
.base = S5PC100_GPH0_BASE,
.config = &gpio_cfg_eint,
.chip = {
.base = S5PC100_GPH0(0),
.ngpio = S5PC100_GPIO_H0_NR,
.label = "GPH0",
},
}, {
.base = S5PC100_GPH1_BASE,
.config = &gpio_cfg_eint,
.chip = {
.base = S5PC100_GPH1(0),
.ngpio = S5PC100_GPIO_H1_NR,
.label = "GPH1",
},
}, {
.base = S5PC100_GPH2_BASE,
.config = &gpio_cfg_eint,
.chip = {
.base = S5PC100_GPH2(0),
.ngpio = S5PC100_GPIO_H2_NR,
.label = "GPH2",
},
}, {
.base = S5PC100_GPH3_BASE,
.config = &gpio_cfg_eint,
.chip = {
.base = S5PC100_GPH3(0),
.ngpio = S5PC100_GPIO_H3_NR,
.label = "GPH3",
},
}, {
.base = S5PC100_GPI_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPI(0),
.ngpio = S5PC100_GPIO_I_NR,
.label = "GPI",
},
}, {
.base = S5PC100_GPJ0_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPJ0(0),
.ngpio = S5PC100_GPIO_J0_NR,
.label = "GPJ0",
},
}, {
.base = S5PC100_GPJ1_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPJ1(0),
.ngpio = S5PC100_GPIO_J1_NR,
.label = "GPJ1",
},
}, {
.base = S5PC100_GPJ2_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPJ2(0),
.ngpio = S5PC100_GPIO_J2_NR,
.label = "GPJ2",
},
}, {
.base = S5PC100_GPJ3_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPJ3(0),
.ngpio = S5PC100_GPIO_J3_NR,
.label = "GPJ3",
},
}, {
.base = S5PC100_GPJ4_BASE,
.config = &gpio_cfg,
.chip = {
.base = S5PC100_GPJ4(0),
.ngpio = S5PC100_GPIO_J4_NR,
.label = "GPJ4",
},
}, {
.base = S5PC100_GPK0_BASE,
.config = &gpio_cfg_noint,
.chip = {
.base = S5PC100_GPK0(0),
.ngpio = S5PC100_GPIO_K0_NR,
.label = "GPK0",
},
}, {
.base = S5PC100_GPK1_BASE,
.config = &gpio_cfg_noint,
.chip = {
.base = S5PC100_GPK1(0),
.ngpio = S5PC100_GPIO_K1_NR,
.label = "GPK1",
},
}, {
.base = S5PC100_GPK2_BASE,
.config = &gpio_cfg_noint,
.chip = {
.base = S5PC100_GPK2(0),
.ngpio = S5PC100_GPIO_K2_NR,
.label = "GPK2",
},
}, {
.base = S5PC100_GPK3_BASE,
.config = &gpio_cfg_noint,
.chip = {
.base = S5PC100_GPK3(0),
.ngpio = S5PC100_GPIO_K3_NR,
.label = "GPK3",
},
}, {
.base = S5PC100_GPL0_BASE,
.config = &gpio_cfg_noint,
.chip = {
.base = S5PC100_GPL0(0),
.ngpio = S5PC100_GPIO_L0_NR,
.label = "GPL0",
},
}, {
.base = S5PC100_GPL1_BASE,
.config = &gpio_cfg_noint,
.chip = {
.base = S5PC100_GPL1(0),
.ngpio = S5PC100_GPIO_L1_NR,
.label = "GPL1",
},
}, {
.base = S5PC100_GPL2_BASE,
.config = &gpio_cfg_noint,
.chip = {
.base = S5PC100_GPL2(0),
.ngpio = S5PC100_GPIO_L2_NR,
.label = "GPL2",
},
}, {
.base = S5PC100_GPL3_BASE,
.config = &gpio_cfg_noint,
.chip = {
.base = S5PC100_GPL3(0),
.ngpio = S5PC100_GPIO_L3_NR,
.label = "GPL3",
},
}, {
.base = S5PC100_GPL4_BASE,
.config = &gpio_cfg_noint,
.chip = {
.base = S5PC100_GPL4(0),
.ngpio = S5PC100_GPIO_L4_NR,
.label = "GPL4",
},
},
};
/* FIXME move from irq-gpio.c */
extern struct irq_chip s5pc1xx_gpioint;
extern void s5pc1xx_irq_gpioint_handler(unsigned int irq, struct irq_desc *desc);
static __init void s5pc1xx_gpiolib_link(struct s3c_gpio_chip *chip)
{
chip->chip.direction_input = s5pc1xx_gpiolib_input;
chip->chip.direction_output = s5pc1xx_gpiolib_output;
chip->pm = __gpio_pm(&s3c_gpio_pm_4bit);
/* Interrupt */
if (chip->config == &gpio_cfg) {
int i, irq;
chip->chip.to_irq = s5pc1xx_gpiolib_to_irq;
for (i = 0; i < chip->chip.ngpio; i++) {
irq = S3C_IRQ_GPIO_BASE + chip->chip.base + i;
set_irq_chip(irq, &s5pc1xx_gpioint);
set_irq_data(irq, &chip->chip);
set_irq_handler(irq, handle_level_irq);
set_irq_flags(irq, IRQF_VALID);
}
} else if (chip->config == &gpio_cfg_eint)
chip->chip.to_irq = s5pc1xx_gpiolib_to_eint;
}
static __init void s5pc1xx_gpiolib_add(struct s3c_gpio_chip *chips,
int nr_chips,
void (*fn)(struct s3c_gpio_chip *))
{
for (; nr_chips > 0; nr_chips--, chips++) {
if (fn)
(fn)(chips);
s3c_gpiolib_add(chips);
}
}
static __init int s5pc1xx_gpiolib_init(void)
{
struct s3c_gpio_chip *chips;
int nr_chips;
chips = s5pc100_gpio_chips;
nr_chips = ARRAY_SIZE(s5pc100_gpio_chips);
s5pc1xx_gpiolib_add(chips, nr_chips, s5pc1xx_gpiolib_link);
/* Interrupt */
set_irq_chained_handler(IRQ_GPIOINT, s5pc1xx_irq_gpioint_handler);
return 0;
}
core_initcall(s5pc1xx_gpiolib_init);