435 lines
10 KiB
C
435 lines
10 KiB
C
/* arch/arm/plat-s3c64xx/gpiolib.c
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*
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* Copyright 2008 Openmoko, Inc.
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* Copyright 2008 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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* http://armlinux.simtec.co.uk/
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*
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* S3C64XX - GPIOlib support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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#include <mach/map.h>
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#include <mach/gpio.h>
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#include <mach/gpio-core.h>
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#include <plat/gpio-cfg.h>
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#include <plat/gpio-cfg-helpers.h>
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#include <plat/regs-gpio.h>
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/* GPIO bank summary:
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*
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* Bank GPIOs Style SlpCon ExtInt Group
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* A 8 4Bit Yes 1
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* B 7 4Bit Yes 1
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* C 8 4Bit Yes 2
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* D 5 4Bit Yes 3
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* E 5 4Bit Yes None
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* F 16 2Bit Yes 4 [1]
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* G 7 4Bit Yes 5
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* H 10 4Bit[2] Yes 6
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* I 16 2Bit Yes None
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* J 12 2Bit Yes None
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* K 16 4Bit[2] No None
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* L 15 4Bit[2] No None
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* M 6 4Bit No IRQ_EINT
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* N 16 2Bit No IRQ_EINT
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* O 16 2Bit Yes 7
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* P 15 2Bit Yes 8
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* Q 9 2Bit Yes 9
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*
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* [1] BANKF pins 14,15 do not form part of the external interrupt sources
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* [2] BANK has two control registers, GPxCON0 and GPxCON1
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*/
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#define OFF_GPCON (0x00)
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#define OFF_GPDAT (0x04)
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#define con_4bit_shift(__off) ((__off) * 4)
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#if 1
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#define gpio_dbg(x...) do { } while(0)
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#else
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#define gpio_dbg(x...) printk(KERN_DEBUG x)
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#endif
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/* The s3c64xx_gpiolib_4bit routines are to control the gpio banks where
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* the gpio configuration register (GPxCON) has 4 bits per GPIO, as the
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* following example:
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*
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* base + 0x00: Control register, 4 bits per gpio
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* gpio n: 4 bits starting at (4*n)
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* 0000 = input, 0001 = output, others mean special-function
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* base + 0x04: Data register, 1 bit per gpio
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* bit n: data bit n
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*
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* Note, since the data register is one bit per gpio and is at base + 0x4
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* we can use s3c_gpiolib_get and s3c_gpiolib_set to change the state of
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* the output.
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*/
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static int s3c64xx_gpiolib_4bit_input(struct gpio_chip *chip, unsigned offset)
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{
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struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
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void __iomem *base = ourchip->base;
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unsigned long con;
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con = __raw_readl(base + OFF_GPCON);
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con &= ~(0xf << con_4bit_shift(offset));
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__raw_writel(con, base + OFF_GPCON);
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gpio_dbg("%s: %p: CON now %08lx\n", __func__, base, con);
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return 0;
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}
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static int s3c64xx_gpiolib_4bit_output(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
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void __iomem *base = ourchip->base;
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unsigned long con;
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unsigned long dat;
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con = __raw_readl(base + OFF_GPCON);
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con &= ~(0xf << con_4bit_shift(offset));
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con |= 0x1 << con_4bit_shift(offset);
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dat = __raw_readl(base + OFF_GPDAT);
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if (value)
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dat |= 1 << offset;
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else
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dat &= ~(1 << offset);
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__raw_writel(dat, base + OFF_GPDAT);
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__raw_writel(con, base + OFF_GPCON);
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__raw_writel(dat, base + OFF_GPDAT);
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gpio_dbg("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);
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return 0;
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}
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/* The next set of routines are for the case where the GPIO configuration
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* registers are 4 bits per GPIO but there is more than one register (the
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* bank has more than 8 GPIOs.
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*
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* This case is the similar to the 4 bit case, but the registers are as
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* follows:
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*
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* base + 0x00: Control register, 4 bits per gpio (lower 8 GPIOs)
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* gpio n: 4 bits starting at (4*n)
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* 0000 = input, 0001 = output, others mean special-function
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* base + 0x04: Control register, 4 bits per gpio (up to 8 additions GPIOs)
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* gpio n: 4 bits starting at (4*n)
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* 0000 = input, 0001 = output, others mean special-function
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* base + 0x08: Data register, 1 bit per gpio
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* bit n: data bit n
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*
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* To allow us to use the s3c_gpiolib_get and s3c_gpiolib_set routines we
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* store the 'base + 0x4' address so that these routines see the data
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* register at ourchip->base + 0x04.
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*/
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static int s3c64xx_gpiolib_4bit2_input(struct gpio_chip *chip, unsigned offset)
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{
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struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
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void __iomem *base = ourchip->base;
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void __iomem *regcon = base;
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unsigned long con;
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if (offset > 7)
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offset -= 8;
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else
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regcon -= 4;
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con = __raw_readl(regcon);
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con &= ~(0xf << con_4bit_shift(offset));
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__raw_writel(con, regcon);
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gpio_dbg("%s: %p: CON %08lx\n", __func__, base, con);
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return 0;
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}
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static int s3c64xx_gpiolib_4bit2_output(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
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void __iomem *base = ourchip->base;
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void __iomem *regcon = base;
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unsigned long con;
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unsigned long dat;
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if (offset > 7)
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offset -= 8;
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else
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regcon -= 4;
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con = __raw_readl(regcon);
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con &= ~(0xf << con_4bit_shift(offset));
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con |= 0x1 << con_4bit_shift(offset);
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dat = __raw_readl(base + OFF_GPDAT);
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if (value)
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dat |= 1 << offset;
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else
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dat &= ~(1 << offset);
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__raw_writel(dat, base + OFF_GPDAT);
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__raw_writel(con, regcon);
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__raw_writel(dat, base + OFF_GPDAT);
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gpio_dbg("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);
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return 0;
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}
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static struct s3c_gpio_cfg gpio_4bit_cfg_noint = {
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.set_config = s3c_gpio_setcfg_s3c64xx_4bit,
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.set_pull = s3c_gpio_setpull_updown,
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.get_pull = s3c_gpio_getpull_updown,
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};
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static struct s3c_gpio_cfg gpio_4bit_cfg_eint0111 = {
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.cfg_eint = 7,
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.set_config = s3c_gpio_setcfg_s3c64xx_4bit,
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.set_pull = s3c_gpio_setpull_updown,
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.get_pull = s3c_gpio_getpull_updown,
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};
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static struct s3c_gpio_cfg gpio_4bit_cfg_eint0011 = {
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.cfg_eint = 3,
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.set_config = s3c_gpio_setcfg_s3c64xx_4bit,
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.set_pull = s3c_gpio_setpull_updown,
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.get_pull = s3c_gpio_getpull_updown,
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};
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static struct s3c_gpio_chip gpio_4bit[] = {
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{
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.base = S3C64XX_GPA_BASE,
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.config = &gpio_4bit_cfg_eint0111,
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.chip = {
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.base = S3C64XX_GPA(0),
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.ngpio = S3C64XX_GPIO_A_NR,
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.label = "GPA",
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},
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}, {
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.base = S3C64XX_GPB_BASE,
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.config = &gpio_4bit_cfg_eint0111,
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.chip = {
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.base = S3C64XX_GPB(0),
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.ngpio = S3C64XX_GPIO_B_NR,
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.label = "GPB",
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},
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}, {
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.base = S3C64XX_GPC_BASE,
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.config = &gpio_4bit_cfg_eint0111,
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.chip = {
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.base = S3C64XX_GPC(0),
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.ngpio = S3C64XX_GPIO_C_NR,
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.label = "GPC",
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},
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}, {
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.base = S3C64XX_GPD_BASE,
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.config = &gpio_4bit_cfg_eint0111,
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.chip = {
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.base = S3C64XX_GPD(0),
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.ngpio = S3C64XX_GPIO_D_NR,
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.label = "GPD",
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},
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}, {
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.base = S3C64XX_GPE_BASE,
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.config = &gpio_4bit_cfg_noint,
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.chip = {
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.base = S3C64XX_GPE(0),
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.ngpio = S3C64XX_GPIO_E_NR,
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.label = "GPE",
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},
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}, {
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.base = S3C64XX_GPG_BASE,
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.config = &gpio_4bit_cfg_eint0111,
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.chip = {
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.base = S3C64XX_GPG(0),
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.ngpio = S3C64XX_GPIO_G_NR,
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.label = "GPG",
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},
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}, {
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.base = S3C64XX_GPM_BASE,
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.config = &gpio_4bit_cfg_eint0011,
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.chip = {
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.base = S3C64XX_GPM(0),
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.ngpio = S3C64XX_GPIO_M_NR,
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.label = "GPM",
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},
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},
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};
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static struct s3c_gpio_chip gpio_4bit2[] = {
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{
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.base = S3C64XX_GPH_BASE + 0x4,
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.config = &gpio_4bit_cfg_eint0111,
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.chip = {
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.base = S3C64XX_GPH(0),
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.ngpio = S3C64XX_GPIO_H_NR,
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.label = "GPH",
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},
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}, {
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.base = S3C64XX_GPK_BASE + 0x4,
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.config = &gpio_4bit_cfg_noint,
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.chip = {
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.base = S3C64XX_GPK(0),
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.ngpio = S3C64XX_GPIO_K_NR,
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.label = "GPK",
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},
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}, {
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.base = S3C64XX_GPL_BASE + 0x4,
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.config = &gpio_4bit_cfg_eint0011,
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.chip = {
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.base = S3C64XX_GPL(0),
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.ngpio = S3C64XX_GPIO_L_NR,
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.label = "GPL",
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},
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},
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};
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static struct s3c_gpio_cfg gpio_2bit_cfg_noint = {
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.set_config = s3c_gpio_setcfg_s3c24xx,
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.set_pull = s3c_gpio_setpull_updown,
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.get_pull = s3c_gpio_getpull_updown,
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};
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static struct s3c_gpio_cfg gpio_2bit_cfg_eint10 = {
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.cfg_eint = 2,
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.set_config = s3c_gpio_setcfg_s3c24xx,
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.set_pull = s3c_gpio_setpull_updown,
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.get_pull = s3c_gpio_getpull_updown,
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};
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static struct s3c_gpio_cfg gpio_2bit_cfg_eint11 = {
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.cfg_eint = 3,
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.set_config = s3c_gpio_setcfg_s3c24xx,
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.set_pull = s3c_gpio_setpull_updown,
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.get_pull = s3c_gpio_getpull_updown,
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};
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int s3c64xx_gpio2int_gpn(struct gpio_chip *chip, unsigned pin)
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{
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return IRQ_EINT(0) + pin;
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}
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static struct s3c_gpio_chip gpio_2bit[] = {
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{
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.base = S3C64XX_GPF_BASE,
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.config = &gpio_2bit_cfg_eint11,
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.chip = {
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.base = S3C64XX_GPF(0),
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.ngpio = S3C64XX_GPIO_F_NR,
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.label = "GPF",
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},
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}, {
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.base = S3C64XX_GPI_BASE,
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.config = &gpio_2bit_cfg_noint,
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.chip = {
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.base = S3C64XX_GPI(0),
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.ngpio = S3C64XX_GPIO_I_NR,
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.label = "GPI",
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},
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}, {
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.base = S3C64XX_GPJ_BASE,
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.config = &gpio_2bit_cfg_noint,
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.chip = {
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.base = S3C64XX_GPJ(0),
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.ngpio = S3C64XX_GPIO_J_NR,
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.label = "GPJ",
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},
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}, {
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.base = S3C64XX_GPN_BASE,
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.config = &gpio_2bit_cfg_eint10,
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.chip = {
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.base = S3C64XX_GPN(0),
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.ngpio = S3C64XX_GPIO_N_NR,
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.label = "GPN",
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.to_irq = s3c64xx_gpio2int_gpn,
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},
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}, {
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.base = S3C64XX_GPO_BASE,
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.config = &gpio_2bit_cfg_eint11,
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.chip = {
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.base = S3C64XX_GPO(0),
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.ngpio = S3C64XX_GPIO_O_NR,
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.label = "GPO",
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},
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}, {
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.base = S3C64XX_GPP_BASE,
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.config = &gpio_2bit_cfg_eint11,
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.chip = {
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.base = S3C64XX_GPP(0),
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.ngpio = S3C64XX_GPIO_P_NR,
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.label = "GPP",
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},
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}, {
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.base = S3C64XX_GPQ_BASE,
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.config = &gpio_2bit_cfg_eint11,
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.chip = {
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.base = S3C64XX_GPQ(0),
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.ngpio = S3C64XX_GPIO_Q_NR,
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.label = "GPQ",
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},
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},
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};
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static __init void s3c64xx_gpiolib_add_4bit(struct s3c_gpio_chip *chip)
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{
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chip->chip.direction_input = s3c64xx_gpiolib_4bit_input;
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chip->chip.direction_output = s3c64xx_gpiolib_4bit_output;
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chip->pm = __gpio_pm(&s3c_gpio_pm_4bit);
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}
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static __init void s3c64xx_gpiolib_add_4bit2(struct s3c_gpio_chip *chip)
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{
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chip->chip.direction_input = s3c64xx_gpiolib_4bit2_input;
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chip->chip.direction_output = s3c64xx_gpiolib_4bit2_output;
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chip->pm = __gpio_pm(&s3c_gpio_pm_4bit);
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}
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static __init void s3c64xx_gpiolib_add_2bit(struct s3c_gpio_chip *chip)
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{
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chip->pm = __gpio_pm(&s3c_gpio_pm_2bit);
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}
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static __init void s3c64xx_gpiolib_add(struct s3c_gpio_chip *chips,
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int nr_chips,
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void (*fn)(struct s3c_gpio_chip *))
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{
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for (; nr_chips > 0; nr_chips--, chips++) {
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if (fn)
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(fn)(chips);
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s3c_gpiolib_add(chips);
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}
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}
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static __init int s3c64xx_gpiolib_init(void)
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{
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s3c64xx_gpiolib_add(gpio_4bit, ARRAY_SIZE(gpio_4bit),
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s3c64xx_gpiolib_add_4bit);
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s3c64xx_gpiolib_add(gpio_4bit2, ARRAY_SIZE(gpio_4bit2),
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s3c64xx_gpiolib_add_4bit2);
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s3c64xx_gpiolib_add(gpio_2bit, ARRAY_SIZE(gpio_2bit),
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s3c64xx_gpiolib_add_2bit);
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return 0;
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}
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core_initcall(s3c64xx_gpiolib_init);
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