/* arch/arm/plat-s3c64xx/gpiolib.c
*
* Copyright 2008 Openmoko, Inc.
* Copyright 2008 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* S3C64XX - 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 <mach/map.h>
#include <mach/gpio.h>
#include <mach/gpio-core.h>
#include <plat/gpio-cfg.h>
#include <plat/gpio-cfg-helpers.h>
#include <plat/regs-gpio.h>
/* GPIO bank summary:
*
* Bank GPIOs Style SlpCon ExtInt Group
* A 8 4Bit Yes 1
* B 7 4Bit Yes 1
* C 8 4Bit Yes 2
* D 5 4Bit Yes 3
* E 5 4Bit Yes None
* F 16 2Bit Yes 4 [1]
* G 7 4Bit Yes 5
* H 10 4Bit[2] Yes 6
* I 16 2Bit Yes None
* J 12 2Bit Yes None
* K 16 4Bit[2] No None
* L 15 4Bit[2] No None
* M 6 4Bit No IRQ_EINT
* N 16 2Bit No IRQ_EINT
* O 16 2Bit Yes 7
* P 15 2Bit Yes 8
* Q 9 2Bit Yes 9
*
* [1] BANKF pins 14,15 do not form part of the external interrupt sources
* [2] BANK has two control registers, GPxCON0 and GPxCON1
*/
#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 s3c64xx_gpiolib_4bit 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 s3c64xx_gpiolib_4bit_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 s3c64xx_gpiolib_4bit_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;
}
/* The next set of routines are for the case where the GPIO configuration
* registers are 4 bits per GPIO but there is more than one register (the
* bank has more than 8 GPIOs.
*
* This case is the similar to the 4 bit case, but the registers are as
* follows:
*
* base + 0x00: Control register, 4 bits per gpio (lower 8 GPIOs)
* gpio n: 4 bits starting at (4*n)
* 0000 = input, 0001 = output, others mean special-function
* base + 0x04: Control register, 4 bits per gpio (up to 8 additions GPIOs)
* gpio n: 4 bits starting at (4*n)
* 0000 = input, 0001 = output, others mean special-function
* base + 0x08: Data register, 1 bit per gpio
* bit n: data bit n
*
* To allow us to use the s3c_gpiolib_get and s3c_gpiolib_set routines we
* store the 'base + 0x4' address so that these routines see the data
* register at ourchip->base + 0x04.
*/
static int s3c64xx_gpiolib_4bit2_input(struct gpio_chip *chip, unsigned offset)
{
struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
void __iomem *base = ourchip->base;
void __iomem *regcon = base;
unsigned long con;
if (offset > 7)
offset -= 8;
else
regcon -= 4;
con = __raw_readl(regcon);
con &= ~(0xf << con_4bit_shift(offset));
__raw_writel(con, regcon);
gpio_dbg("%s: %p: CON %08lx\n", __func__, base, con);
return 0;
}
static int s3c64xx_gpiolib_4bit2_output(struct gpio_chip *chip,
unsigned offset, int value)
{
struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
void __iomem *base = ourchip->base;
void __iomem *regcon = base;
unsigned long con;
unsigned long dat;
if (offset > 7)
offset -= 8;
else
regcon -= 4;
con = __raw_readl(regcon);
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, regcon);
__raw_writel(dat, base + OFF_GPDAT);
gpio_dbg("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);
return 0;
}
static struct s3c_gpio_cfg gpio_4bit_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_cfg gpio_4bit_cfg_eint0111 = {
.cfg_eint = 7,
.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_4bit_cfg_eint0011 = {
.cfg_eint = 3,
.set_config = s3c_gpio_setcfg_s3c64xx_4bit,
.set_pull = s3c_gpio_setpull_updown,
.get_pull = s3c_gpio_getpull_updown,
};
static struct s3c_gpio_chip gpio_4bit[] = {
{
.base = S3C64XX_GPA_BASE,
.config = &gpio_4bit_cfg_eint0111,
.chip = {
.base = S3C64XX_GPA(0),
.ngpio = S3C64XX_GPIO_A_NR,
.label = "GPA",
},
}, {
.base = S3C64XX_GPB_BASE,
.config = &gpio_4bit_cfg_eint0111,
.chip = {
.base = S3C64XX_GPB(0),
.ngpio = S3C64XX_GPIO_B_NR,
.label = "GPB",
},
}, {
.base = S3C64XX_GPC_BASE,
.config = &gpio_4bit_cfg_eint0111,
.chip = {
.base = S3C64XX_GPC(0),
.ngpio = S3C64XX_GPIO_C_NR,
.label = "GPC",
},
}, {
.base = S3C64XX_GPD_BASE,
.config = &gpio_4bit_cfg_eint0111,
.chip = {
.base = S3C64XX_GPD(0),
.ngpio = S3C64XX_GPIO_D_NR,
.label = "GPD",
},
}, {
.base = S3C64XX_GPE_BASE,
.config = &gpio_4bit_cfg_noint,
.chip = {
.base = S3C64XX_GPE(0),
.ngpio = S3C64XX_GPIO_E_NR,
.label = "GPE",
},
}, {
.base = S3C64XX_GPG_BASE,
.config = &gpio_4bit_cfg_eint0111,
.chip = {
.base = S3C64XX_GPG(0),
.ngpio = S3C64XX_GPIO_G_NR,
.label = "GPG",
},
}, {
.base = S3C64XX_GPM_BASE,
.config = &gpio_4bit_cfg_eint0011,
.chip = {
.base = S3C64XX_GPM(0),
.ngpio = S3C64XX_GPIO_M_NR,
.label = "GPM",
},
},
};
static struct s3c_gpio_chip gpio_4bit2[] = {
{
.base = S3C64XX_GPH_BASE + 0x4,
.config = &gpio_4bit_cfg_eint0111,
.chip = {
.base = S3C64XX_GPH(0),
.ngpio = S3C64XX_GPIO_H_NR,
.label = "GPH",
},
}, {
.base = S3C64XX_GPK_BASE + 0x4,
.config = &gpio_4bit_cfg_noint,
.chip = {
.base = S3C64XX_GPK(0),
.ngpio = S3C64XX_GPIO_K_NR,
.label = "GPK",
},
}, {
.base = S3C64XX_GPL_BASE + 0x4,
.config = &gpio_4bit_cfg_eint0011,
.chip = {
.base = S3C64XX_GPL(0),
.ngpio = S3C64XX_GPIO_L_NR,
.label = "GPL",
},
},
};
static struct s3c_gpio_cfg gpio_2bit_cfg_noint = {
.set_config = s3c_gpio_setcfg_s3c24xx,
.set_pull = s3c_gpio_setpull_updown,
.get_pull = s3c_gpio_getpull_updown,
};
static struct s3c_gpio_cfg gpio_2bit_cfg_eint10 = {
.cfg_eint = 2,
.set_config = s3c_gpio_setcfg_s3c24xx,
.set_pull = s3c_gpio_setpull_updown,
.get_pull = s3c_gpio_getpull_updown,
};
static struct s3c_gpio_cfg gpio_2bit_cfg_eint11 = {
.cfg_eint = 3,
.set_config = s3c_gpio_setcfg_s3c24xx,
.set_pull = s3c_gpio_setpull_updown,
.get_pull = s3c_gpio_getpull_updown,
};
int s3c64xx_gpio2int_gpn(struct gpio_chip *chip, unsigned pin)
{
return IRQ_EINT(0) + pin;
}
static struct s3c_gpio_chip gpio_2bit[] = {
{
.base = S3C64XX_GPF_BASE,
.config = &gpio_2bit_cfg_eint11,
.chip = {
.base = S3C64XX_GPF(0),
.ngpio = S3C64XX_GPIO_F_NR,
.label = "GPF",
},
}, {
.base = S3C64XX_GPI_BASE,
.config = &gpio_2bit_cfg_noint,
.chip = {
.base = S3C64XX_GPI(0),
.ngpio = S3C64XX_GPIO_I_NR,
.label = "GPI",
},
}, {
.base = S3C64XX_GPJ_BASE,
.config = &gpio_2bit_cfg_noint,
.chip = {
.base = S3C64XX_GPJ(0),
.ngpio = S3C64XX_GPIO_J_NR,
.label = "GPJ",
},
}, {
.base = S3C64XX_GPN_BASE,
.config = &gpio_2bit_cfg_eint10,
.chip = {
.base = S3C64XX_GPN(0),
.ngpio = S3C64XX_GPIO_N_NR,
.label = "GPN",
.to_irq = s3c64xx_gpio2int_gpn,
},
}, {
.base = S3C64XX_GPO_BASE,
.config = &gpio_2bit_cfg_eint11,
.chip = {
.base = S3C64XX_GPO(0),
.ngpio = S3C64XX_GPIO_O_NR,
.label = "GPO",
},
}, {
.base = S3C64XX_GPP_BASE,
.config = &gpio_2bit_cfg_eint11,
.chip = {
.base = S3C64XX_GPP(0),
.ngpio = S3C64XX_GPIO_P_NR,
.label = "GPP",
},
}, {
.base = S3C64XX_GPQ_BASE,
.config = &gpio_2bit_cfg_eint11,
.chip = {
.base = S3C64XX_GPQ(0),
.ngpio = S3C64XX_GPIO_Q_NR,
.label = "GPQ",
},
},
};
static __init void s3c64xx_gpiolib_add_4bit(struct s3c_gpio_chip *chip)
{
chip->chip.direction_input = s3c64xx_gpiolib_4bit_input;
chip->chip.direction_output = s3c64xx_gpiolib_4bit_output;
chip->pm = __gpio_pm(&s3c_gpio_pm_4bit);
}
static __init void s3c64xx_gpiolib_add_4bit2(struct s3c_gpio_chip *chip)
{
chip->chip.direction_input = s3c64xx_gpiolib_4bit2_input;
chip->chip.direction_output = s3c64xx_gpiolib_4bit2_output;
chip->pm = __gpio_pm(&s3c_gpio_pm_4bit);
}
static __init void s3c64xx_gpiolib_add_2bit(struct s3c_gpio_chip *chip)
{
chip->pm = __gpio_pm(&s3c_gpio_pm_2bit);
}
static __init void s3c64xx_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 s3c64xx_gpiolib_init(void)
{
s3c64xx_gpiolib_add(gpio_4bit, ARRAY_SIZE(gpio_4bit),
s3c64xx_gpiolib_add_4bit);
s3c64xx_gpiolib_add(gpio_4bit2, ARRAY_SIZE(gpio_4bit2),
s3c64xx_gpiolib_add_4bit2);
s3c64xx_gpiolib_add(gpio_2bit, ARRAY_SIZE(gpio_2bit),
s3c64xx_gpiolib_add_2bit);
return 0;
}
core_initcall(s3c64xx_gpiolib_init);
