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-rw-r--r--arch/arm/plat-samsung/Kconfig3
-rw-r--r--arch/arm/plat-samsung/Makefile2
-rw-r--r--arch/arm/plat-samsung/gpio-samsung.c1328
3 files changed, 1333 insertions, 0 deletions
diff --git a/arch/arm/plat-samsung/Kconfig b/arch/arm/plat-samsung/Kconfig
index 57729b915003..1a1ba83e7da6 100644
--- a/arch/arm/plat-samsung/Kconfig
+++ b/arch/arm/plat-samsung/Kconfig
@@ -225,6 +225,9 @@ config S3C24XX_PWM
Support for exporting the PWM timer blocks via the pwm device
system
+config GPIO_SAMSUNG
+ def_bool y
+
config SAMSUNG_PM_GPIO
bool
default y if GPIO_SAMSUNG && PM
diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat-samsung/Makefile
index 8c911760f55f..aeb19e3288b9 100644
--- a/arch/arm/plat-samsung/Makefile
+++ b/arch/arm/plat-samsung/Makefile
@@ -21,6 +21,8 @@ obj-$(CONFIG_SAMSUNG_ATAGS) += platformdata.o
obj-$(CONFIG_SAMSUNG_ATAGS) += devs.o
obj-$(CONFIG_SAMSUNG_ATAGS) += dev-uart.o
+obj-$(CONFIG_GPIO_SAMSUNG) += gpio-samsung.o
+
# PM support
obj-$(CONFIG_PM_SLEEP) += pm-common.o
diff --git a/arch/arm/plat-samsung/gpio-samsung.c b/arch/arm/plat-samsung/gpio-samsung.c
new file mode 100644
index 000000000000..7c288ba4dc87
--- /dev/null
+++ b/arch/arm/plat-samsung/gpio-samsung.c
@@ -0,0 +1,1328 @@
+/*
+ * Copyright (c) 2009-2011 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com/
+ *
+ * Copyright 2008 Openmoko, Inc.
+ * Copyright 2008 Simtec Electronics
+ * Ben Dooks <ben@simtec.co.uk>
+ * http://armlinux.simtec.co.uk/
+ *
+ * SAMSUNG - 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 <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/ioport.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/of_address.h>
+
+#include <asm/irq.h>
+
+#include <mach/map.h>
+#include <mach/regs-gpio.h>
+#include <mach/gpio-samsung.h>
+
+#include <plat/cpu.h>
+#include <plat/gpio-core.h>
+#include <plat/gpio-cfg.h>
+#include <plat/gpio-cfg-helpers.h>
+#include <plat/pm.h>
+
+int samsung_gpio_setpull_updown(struct samsung_gpio_chip *chip,
+ unsigned int off, samsung_gpio_pull_t pull)
+{
+ void __iomem *reg = chip->base + 0x08;
+ int shift = off * 2;
+ u32 pup;
+
+ pup = __raw_readl(reg);
+ pup &= ~(3 << shift);
+ pup |= pull << shift;
+ __raw_writel(pup, reg);
+
+ return 0;
+}
+
+samsung_gpio_pull_t samsung_gpio_getpull_updown(struct samsung_gpio_chip *chip,
+ unsigned int off)
+{
+ void __iomem *reg = chip->base + 0x08;
+ int shift = off * 2;
+ u32 pup = __raw_readl(reg);
+
+ pup >>= shift;
+ pup &= 0x3;
+
+ return (__force samsung_gpio_pull_t)pup;
+}
+
+int s3c2443_gpio_setpull(struct samsung_gpio_chip *chip,
+ unsigned int off, samsung_gpio_pull_t pull)
+{
+ switch (pull) {
+ case S3C_GPIO_PULL_NONE:
+ pull = 0x01;
+ break;
+ case S3C_GPIO_PULL_UP:
+ pull = 0x00;
+ break;
+ case S3C_GPIO_PULL_DOWN:
+ pull = 0x02;
+ break;
+ }
+ return samsung_gpio_setpull_updown(chip, off, pull);
+}
+
+samsung_gpio_pull_t s3c2443_gpio_getpull(struct samsung_gpio_chip *chip,
+ unsigned int off)
+{
+ samsung_gpio_pull_t pull;
+
+ pull = samsung_gpio_getpull_updown(chip, off);
+
+ switch (pull) {
+ case 0x00:
+ pull = S3C_GPIO_PULL_UP;
+ break;
+ case 0x01:
+ case 0x03:
+ pull = S3C_GPIO_PULL_NONE;
+ break;
+ case 0x02:
+ pull = S3C_GPIO_PULL_DOWN;
+ break;
+ }
+
+ return pull;
+}
+
+static int s3c24xx_gpio_setpull_1(struct samsung_gpio_chip *chip,
+ unsigned int off, samsung_gpio_pull_t pull,
+ samsung_gpio_pull_t updown)
+{
+ void __iomem *reg = chip->base + 0x08;
+ u32 pup = __raw_readl(reg);
+
+ if (pull == updown)
+ pup &= ~(1 << off);
+ else if (pull == S3C_GPIO_PULL_NONE)
+ pup |= (1 << off);
+ else
+ return -EINVAL;
+
+ __raw_writel(pup, reg);
+ return 0;
+}
+
+static samsung_gpio_pull_t s3c24xx_gpio_getpull_1(struct samsung_gpio_chip *chip,
+ unsigned int off,
+ samsung_gpio_pull_t updown)
+{
+ void __iomem *reg = chip->base + 0x08;
+ u32 pup = __raw_readl(reg);
+
+ pup &= (1 << off);
+ return pup ? S3C_GPIO_PULL_NONE : updown;
+}
+
+samsung_gpio_pull_t s3c24xx_gpio_getpull_1up(struct samsung_gpio_chip *chip,
+ unsigned int off)
+{
+ return s3c24xx_gpio_getpull_1(chip, off, S3C_GPIO_PULL_UP);
+}
+
+int s3c24xx_gpio_setpull_1up(struct samsung_gpio_chip *chip,
+ unsigned int off, samsung_gpio_pull_t pull)
+{
+ return s3c24xx_gpio_setpull_1(chip, off, pull, S3C_GPIO_PULL_UP);
+}
+
+samsung_gpio_pull_t s3c24xx_gpio_getpull_1down(struct samsung_gpio_chip *chip,
+ unsigned int off)
+{
+ return s3c24xx_gpio_getpull_1(chip, off, S3C_GPIO_PULL_DOWN);
+}
+
+int s3c24xx_gpio_setpull_1down(struct samsung_gpio_chip *chip,
+ unsigned int off, samsung_gpio_pull_t pull)
+{
+ return s3c24xx_gpio_setpull_1(chip, off, pull, S3C_GPIO_PULL_DOWN);
+}
+
+/*
+ * samsung_gpio_setcfg_2bit - Samsung 2bit style GPIO configuration.
+ * @chip: The gpio chip that is being configured.
+ * @off: The offset for the GPIO being configured.
+ * @cfg: The configuration value to set.
+ *
+ * This helper deal with the GPIO cases where the control register
+ * has two bits of configuration per gpio, which have the following
+ * functions:
+ * 00 = input
+ * 01 = output
+ * 1x = special function
+ */
+
+static int samsung_gpio_setcfg_2bit(struct samsung_gpio_chip *chip,
+ unsigned int off, unsigned int cfg)
+{
+ void __iomem *reg = chip->base;
+ unsigned int shift = off * 2;
+ u32 con;
+
+ if (samsung_gpio_is_cfg_special(cfg)) {
+ cfg &= 0xf;
+ if (cfg > 3)
+ return -EINVAL;
+
+ cfg <<= shift;
+ }
+
+ con = __raw_readl(reg);
+ con &= ~(0x3 << shift);
+ con |= cfg;
+ __raw_writel(con, reg);
+
+ return 0;
+}
+
+/*
+ * samsung_gpio_getcfg_2bit - Samsung 2bit style GPIO configuration read.
+ * @chip: The gpio chip that is being configured.
+ * @off: The offset for the GPIO being configured.
+ *
+ * The reverse of samsung_gpio_setcfg_2bit(). Will return a value which
+ * could be directly passed back to samsung_gpio_setcfg_2bit(), from the
+ * S3C_GPIO_SPECIAL() macro.
+ */
+
+static unsigned int samsung_gpio_getcfg_2bit(struct samsung_gpio_chip *chip,
+ unsigned int off)
+{
+ u32 con;
+
+ con = __raw_readl(chip->base);
+ con >>= off * 2;
+ con &= 3;
+
+ /* this conversion works for IN and OUT as well as special mode */
+ return S3C_GPIO_SPECIAL(con);
+}
+
+/*
+ * samsung_gpio_setcfg_4bit - Samsung 4bit single register GPIO config.
+ * @chip: The gpio chip that is being configured.
+ * @off: The offset for the GPIO being configured.
+ * @cfg: The configuration value to set.
+ *
+ * This helper deal with the GPIO cases where the control register has 4 bits
+ * of control per GPIO, generally in the form of:
+ * 0000 = Input
+ * 0001 = Output
+ * others = Special functions (dependent on bank)
+ *
+ * Note, since the code to deal with the case where there are two control
+ * registers instead of one, we do not have a separate set of functions for
+ * each case.
+ */
+
+static int samsung_gpio_setcfg_4bit(struct samsung_gpio_chip *chip,
+ unsigned int off, unsigned int cfg)
+{
+ void __iomem *reg = chip->base;
+ unsigned int shift = (off & 7) * 4;
+ u32 con;
+
+ if (off < 8 && chip->chip.ngpio > 8)
+ reg -= 4;
+
+ if (samsung_gpio_is_cfg_special(cfg)) {
+ cfg &= 0xf;
+ cfg <<= shift;
+ }
+
+ con = __raw_readl(reg);
+ con &= ~(0xf << shift);
+ con |= cfg;
+ __raw_writel(con, reg);
+
+ return 0;
+}
+
+/*
+ * samsung_gpio_getcfg_4bit - Samsung 4bit single register GPIO config read.
+ * @chip: The gpio chip that is being configured.
+ * @off: The offset for the GPIO being configured.
+ *
+ * The reverse of samsung_gpio_setcfg_4bit(), turning a gpio configuration
+ * register setting into a value the software can use, such as could be passed
+ * to samsung_gpio_setcfg_4bit().
+ *
+ * @sa samsung_gpio_getcfg_2bit
+ */
+
+static unsigned samsung_gpio_getcfg_4bit(struct samsung_gpio_chip *chip,
+ unsigned int off)
+{
+ void __iomem *reg = chip->base;
+ unsigned int shift = (off & 7) * 4;
+ u32 con;
+
+ if (off < 8 && chip->chip.ngpio > 8)
+ reg -= 4;
+
+ con = __raw_readl(reg);
+ con >>= shift;
+ con &= 0xf;
+
+ /* this conversion works for IN and OUT as well as special mode */
+ return S3C_GPIO_SPECIAL(con);
+}
+
+#ifdef CONFIG_PLAT_S3C24XX
+/*
+ * s3c24xx_gpio_setcfg_abank - S3C24XX style GPIO configuration (Bank A)
+ * @chip: The gpio chip that is being configured.
+ * @off: The offset for the GPIO being configured.
+ * @cfg: The configuration value to set.
+ *
+ * This helper deal with the GPIO cases where the control register
+ * has one bit of configuration for the gpio, where setting the bit
+ * means the pin is in special function mode and unset means output.
+ */
+
+static int s3c24xx_gpio_setcfg_abank(struct samsung_gpio_chip *chip,
+ unsigned int off, unsigned int cfg)
+{
+ void __iomem *reg = chip->base;
+ unsigned int shift = off;
+ u32 con;
+
+ if (samsung_gpio_is_cfg_special(cfg)) {
+ cfg &= 0xf;
+
+ /* Map output to 0, and SFN2 to 1 */
+ cfg -= 1;
+ if (cfg > 1)
+ return -EINVAL;
+
+ cfg <<= shift;
+ }
+
+ con = __raw_readl(reg);
+ con &= ~(0x1 << shift);
+ con |= cfg;
+ __raw_writel(con, reg);
+
+ return 0;
+}
+
+/*
+ * s3c24xx_gpio_getcfg_abank - S3C24XX style GPIO configuration read (Bank A)
+ * @chip: The gpio chip that is being configured.
+ * @off: The offset for the GPIO being configured.
+ *
+ * The reverse of s3c24xx_gpio_setcfg_abank() turning an GPIO into a usable
+ * GPIO configuration value.
+ *
+ * @sa samsung_gpio_getcfg_2bit
+ * @sa samsung_gpio_getcfg_4bit
+ */
+
+static unsigned s3c24xx_gpio_getcfg_abank(struct samsung_gpio_chip *chip,
+ unsigned int off)
+{
+ u32 con;
+
+ con = __raw_readl(chip->base);
+ con >>= off;
+ con &= 1;
+ con++;
+
+ return S3C_GPIO_SFN(con);
+}
+#endif
+
+static void __init samsung_gpiolib_set_cfg(struct samsung_gpio_cfg *chipcfg,
+ int nr_chips)
+{
+ for (; nr_chips > 0; nr_chips--, chipcfg++) {
+ if (!chipcfg->set_config)
+ chipcfg->set_config = samsung_gpio_setcfg_4bit;
+ if (!chipcfg->get_config)
+ chipcfg->get_config = samsung_gpio_getcfg_4bit;
+ if (!chipcfg->set_pull)
+ chipcfg->set_pull = samsung_gpio_setpull_updown;
+ if (!chipcfg->get_pull)
+ chipcfg->get_pull = samsung_gpio_getpull_updown;
+ }
+}
+
+struct samsung_gpio_cfg s3c24xx_gpiocfg_default = {
+ .set_config = samsung_gpio_setcfg_2bit,
+ .get_config = samsung_gpio_getcfg_2bit,
+};
+
+#ifdef CONFIG_PLAT_S3C24XX
+static struct samsung_gpio_cfg s3c24xx_gpiocfg_banka = {
+ .set_config = s3c24xx_gpio_setcfg_abank,
+ .get_config = s3c24xx_gpio_getcfg_abank,
+};
+#endif
+
+static struct samsung_gpio_cfg samsung_gpio_cfgs[] = {
+ [0] = {
+ .cfg_eint = 0x0,
+ },
+ [1] = {
+ .cfg_eint = 0x3,
+ },
+ [2] = {
+ .cfg_eint = 0x7,
+ },
+ [3] = {
+ .cfg_eint = 0xF,
+ },
+ [4] = {
+ .cfg_eint = 0x0,
+ .set_config = samsung_gpio_setcfg_2bit,
+ .get_config = samsung_gpio_getcfg_2bit,
+ },
+ [5] = {
+ .cfg_eint = 0x2,
+ .set_config = samsung_gpio_setcfg_2bit,
+ .get_config = samsung_gpio_getcfg_2bit,
+ },
+ [6] = {
+ .cfg_eint = 0x3,
+ .set_config = samsung_gpio_setcfg_2bit,
+ .get_config = samsung_gpio_getcfg_2bit,
+ },
+ [7] = {
+ .set_config = samsung_gpio_setcfg_2bit,
+ .get_config = samsung_gpio_getcfg_2bit,
+ },
+};
+
+/*
+ * Default routines for controlling GPIO, based on the original S3C24XX
+ * GPIO functions which deal with the case where each gpio bank of the
+ * chip is as following:
+ *
+ * base + 0x00: Control register, 2 bits per gpio
+ * gpio n: 2 bits starting at (2*n)
+ * 00 = input, 01 = output, others mean special-function
+ * base + 0x04: Data register, 1 bit per gpio
+ * bit n: data bit n
+*/
+
+static int samsung_gpiolib_2bit_input(struct gpio_chip *chip, unsigned offset)
+{
+ struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
+ void __iomem *base = ourchip->base;
+ unsigned long flags;
+ unsigned long con;
+
+ samsung_gpio_lock(ourchip, flags);
+
+ con = __raw_readl(base + 0x00);
+ con &= ~(3 << (offset * 2));
+
+ __raw_writel(con, base + 0x00);
+
+ samsung_gpio_unlock(ourchip, flags);
+ return 0;
+}
+
+static int samsung_gpiolib_2bit_output(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
+ void __iomem *base = ourchip->base;
+ unsigned long flags;
+ unsigned long dat;
+ unsigned long con;
+
+ samsung_gpio_lock(ourchip, flags);
+
+ dat = __raw_readl(base + 0x04);
+ dat &= ~(1 << offset);
+ if (value)
+ dat |= 1 << offset;
+ __raw_writel(dat, base + 0x04);
+
+ con = __raw_readl(base + 0x00);
+ con &= ~(3 << (offset * 2));
+ con |= 1 << (offset * 2);
+
+ __raw_writel(con, base + 0x00);
+ __raw_writel(dat, base + 0x04);
+
+ samsung_gpio_unlock(ourchip, flags);
+ return 0;
+}
+
+/*
+ * The samsung_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 samsung_gpiolib_get and samsung_gpiolib_set to change the
+ * state of the output.
+ */
+
+static int samsung_gpiolib_4bit_input(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
+ void __iomem *base = ourchip->base;
+ unsigned long con;
+
+ con = __raw_readl(base + GPIOCON_OFF);
+ if (ourchip->bitmap_gpio_int & BIT(offset))
+ con |= 0xf << con_4bit_shift(offset);
+ else
+ con &= ~(0xf << con_4bit_shift(offset));
+ __raw_writel(con, base + GPIOCON_OFF);
+
+ pr_debug("%s: %p: CON now %08lx\n", __func__, base, con);
+
+ return 0;
+}
+
+static int samsung_gpiolib_4bit_output(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
+ void __iomem *base = ourchip->base;
+ unsigned long con;
+ unsigned long dat;
+
+ con = __raw_readl(base + GPIOCON_OFF);
+ con &= ~(0xf << con_4bit_shift(offset));
+ con |= 0x1 << con_4bit_shift(offset);
+
+ dat = __raw_readl(base + GPIODAT_OFF);
+
+ if (value)
+ dat |= 1 << offset;
+ else
+ dat &= ~(1 << offset);
+
+ __raw_writel(dat, base + GPIODAT_OFF);
+ __raw_writel(con, base + GPIOCON_OFF);
+ __raw_writel(dat, base + GPIODAT_OFF);
+
+ pr_debug("%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 samsung_gpiolib_get and samsung_gpiolib_set
+ * routines we store the 'base + 0x4' address so that these routines see
+ * the data register at ourchip->base + 0x04.
+ */
+
+static int samsung_gpiolib_4bit2_input(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ struct samsung_gpio_chip *ourchip = to_samsung_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);
+
+ pr_debug("%s: %p: CON %08lx\n", __func__, base, con);
+
+ return 0;
+}
+
+static int samsung_gpiolib_4bit2_output(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
+ void __iomem *base = ourchip->base;
+ void __iomem *regcon = base;
+ unsigned long con;
+ unsigned long dat;
+ unsigned con_offset = offset;
+
+ if (con_offset > 7)
+ con_offset -= 8;
+ else
+ regcon -= 4;
+
+ con = __raw_readl(regcon);
+ con &= ~(0xf << con_4bit_shift(con_offset));
+ con |= 0x1 << con_4bit_shift(con_offset);
+
+ dat = __raw_readl(base + GPIODAT_OFF);
+
+ if (value)
+ dat |= 1 << offset;
+ else
+ dat &= ~(1 << offset);
+
+ __raw_writel(dat, base + GPIODAT_OFF);
+ __raw_writel(con, regcon);
+ __raw_writel(dat, base + GPIODAT_OFF);
+
+ pr_debug("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);
+
+ return 0;
+}
+
+#ifdef CONFIG_PLAT_S3C24XX
+/* The next set of routines are for the case of s3c24xx bank a */
+
+static int s3c24xx_gpiolib_banka_input(struct gpio_chip *chip, unsigned offset)
+{
+ return -EINVAL;
+}
+
+static int s3c24xx_gpiolib_banka_output(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
+ void __iomem *base = ourchip->base;
+ unsigned long flags;
+ unsigned long dat;
+ unsigned long con;
+
+ local_irq_save(flags);
+
+ con = __raw_readl(base + 0x00);
+ dat = __raw_readl(base + 0x04);
+
+ dat &= ~(1 << offset);
+ if (value)
+ dat |= 1 << offset;
+
+ __raw_writel(dat, base + 0x04);
+
+ con &= ~(1 << offset);
+
+ __raw_writel(con, base + 0x00);
+ __raw_writel(dat, base + 0x04);
+
+ local_irq_restore(flags);
+ return 0;
+}
+#endif
+
+static void samsung_gpiolib_set(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
+ void __iomem *base = ourchip->base;
+ unsigned long flags;
+ unsigned long dat;
+
+ samsung_gpio_lock(ourchip, flags);
+
+ dat = __raw_readl(base + 0x04);
+ dat &= ~(1 << offset);
+ if (value)
+ dat |= 1 << offset;
+ __raw_writel(dat, base + 0x04);
+
+ samsung_gpio_unlock(ourchip, flags);
+}
+
+static int samsung_gpiolib_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
+ unsigned long val;
+
+ val = __raw_readl(ourchip->base + 0x04);
+ val >>= offset;
+ val &= 1;
+
+ return val;
+}
+
+/*
+ * CONFIG_S3C_GPIO_TRACK enables the tracking of the s3c specific gpios
+ * for use with the configuration calls, and other parts of the s3c gpiolib
+ * support code.
+ *
+ * Not all s3c support code will need this, as some configurations of cpu
+ * may only support one or two different configuration options and have an
+ * easy gpio to samsung_gpio_chip mapping function. If this is the case, then
+ * the machine support file should provide its own samsung_gpiolib_getchip()
+ * and any other necessary functions.
+ */
+
+#ifdef CONFIG_S3C_GPIO_TRACK
+struct samsung_gpio_chip *s3c_gpios[S3C_GPIO_END];
+
+static __init void s3c_gpiolib_track(struct samsung_gpio_chip *chip)
+{
+ unsigned int gpn;
+ int i;
+
+ gpn = chip->chip.base;
+ for (i = 0; i < chip->chip.ngpio; i++, gpn++) {
+ BUG_ON(gpn >= ARRAY_SIZE(s3c_gpios));
+ s3c_gpios[gpn] = chip;
+ }
+}
+#endif /* CONFIG_S3C_GPIO_TRACK */
+
+/*
+ * samsung_gpiolib_add() - add the Samsung gpio_chip.
+ * @chip: The chip to register
+ *
+ * This is a wrapper to gpiochip_add() that takes our specific gpio chip
+ * information and makes the necessary alterations for the platform and
+ * notes the information for use with the configuration systems and any
+ * other parts of the system.
+ */
+
+static void __init samsung_gpiolib_add(struct samsung_gpio_chip *chip)
+{
+ struct gpio_chip *gc = &chip->chip;
+ int ret;
+
+ BUG_ON(!chip->base);
+ BUG_ON(!gc->label);
+ BUG_ON(!gc->ngpio);
+
+ spin_lock_init(&chip->lock);
+
+ if (!gc->direction_input)
+ gc->direction_input = samsung_gpiolib_2bit_input;
+ if (!gc->direction_output)
+ gc->direction_output = samsung_gpiolib_2bit_output;
+ if (!gc->set)
+ gc->set = samsung_gpiolib_set;
+ if (!gc->get)
+ gc->get = samsung_gpiolib_get;
+
+#ifdef CONFIG_PM
+ if (chip->pm != NULL) {
+ if (!chip->pm->save || !chip->pm->resume)
+ pr_err("gpio: %s has missing PM functions\n",
+ gc->label);
+ } else
+ pr_err("gpio: %s has no PM function\n", gc->label);
+#endif
+
+ /* gpiochip_add() prints own failure message on error. */
+ ret = gpiochip_add(gc);
+ if (ret >= 0)
+ s3c_gpiolib_track(chip);
+}
+
+static void __init s3c24xx_gpiolib_add_chips(struct samsung_gpio_chip *chip,
+ int nr_chips, void __iomem *base)
+{
+ int i;
+ struct gpio_chip *gc = &chip->chip;
+
+ for (i = 0 ; i < nr_chips; i++, chip++) {
+ /* skip banks not present on SoC */
+ if (chip->chip.base >= S3C_GPIO_END)
+ continue;
+
+ if (!chip->config)
+ chip->config = &s3c24xx_gpiocfg_default;
+ if (!chip->pm)
+ chip->pm = __gpio_pm(&samsung_gpio_pm_2bit);
+ if ((base != NULL) && (chip->base == NULL))
+ chip->base = base + ((i) * 0x10);
+
+ if (!gc->direction_input)
+ gc->direction_input = samsung_gpiolib_2bit_input;
+ if (!gc->direction_output)
+ gc->direction_output = samsung_gpiolib_2bit_output;
+
+ samsung_gpiolib_add(chip);
+ }
+}
+
+static void __init samsung_gpiolib_add_2bit_chips(struct samsung_gpio_chip *chip,
+ int nr_chips, void __iomem *base,
+ unsigned int offset)
+{
+ int i;
+
+ for (i = 0 ; i < nr_chips; i++, chip++) {
+ chip->chip.direction_input = samsung_gpiolib_2bit_input;
+ chip->chip.direction_output = samsung_gpiolib_2bit_output;
+
+ if (!chip->config)
+ chip->config = &samsung_gpio_cfgs[7];
+ if (!chip->pm)
+ chip->pm = __gpio_pm(&samsung_gpio_pm_2bit);
+ if ((base != NULL) && (chip->base == NULL))
+ chip->base = base + ((i) * offset);
+
+ samsung_gpiolib_add(chip);
+ }
+}
+
+/*
+ * samsung_gpiolib_add_4bit_chips - 4bit single register GPIO config.
+ * @chip: The gpio chip that is being configured.
+ * @nr_chips: The no of chips (gpio ports) for the GPIO being configured.
+ *
+ * This helper deal with the GPIO cases where the control register has 4 bits
+ * of control per GPIO, generally in the form of:
+ * 0000 = Input
+ * 0001 = Output
+ * others = Special functions (dependent on bank)
+ *
+ * Note, since the code to deal with the case where there are two control
+ * registers instead of one, we do not have a separate set of function
+ * (samsung_gpiolib_add_4bit2_chips)for each case.
+ */
+
+static void __init samsung_gpiolib_add_4bit_chips(struct samsung_gpio_chip *chip,
+ int nr_chips, void __iomem *base)
+{
+ int i;
+
+ for (i = 0 ; i < nr_chips; i++, chip++) {
+ chip->chip.direction_input = samsung_gpiolib_4bit_input;
+ chip->chip.direction_output = samsung_gpiolib_4bit_output;
+
+ if (!chip->config)
+ chip->config = &samsung_gpio_cfgs[2];
+ if (!chip->pm)
+ chip->pm = __gpio_pm(&samsung_gpio_pm_4bit);
+ if ((base != NULL) && (chip->base == NULL))
+ chip->base = base + ((i) * 0x20);
+
+ chip->bitmap_gpio_int = 0;
+
+ samsung_gpiolib_add(chip);
+ }
+}
+
+static void __init samsung_gpiolib_add_4bit2_chips(struct samsung_gpio_chip *chip,
+ int nr_chips)
+{
+ for (; nr_chips > 0; nr_chips--, chip++) {
+ chip->chip.direction_input = samsung_gpiolib_4bit2_input;
+ chip->chip.direction_output = samsung_gpiolib_4bit2_output;
+
+ if (!chip->config)
+ chip->config = &samsung_gpio_cfgs[2];
+ if (!chip->pm)
+ chip->pm = __gpio_pm(&samsung_gpio_pm_4bit);
+
+ samsung_gpiolib_add(chip);
+ }
+}
+
+int samsung_gpiolib_to_irq(struct gpio_chip *chip, unsigned int offset)
+{
+ struct samsung_gpio_chip *samsung_chip = container_of(chip, struct samsung_gpio_chip, chip);
+
+ return samsung_chip->irq_base + offset;
+}
+
+#ifdef CONFIG_PLAT_S3C24XX
+static int s3c24xx_gpiolib_fbank_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+ if (offset < 4) {
+ if (soc_is_s3c2412())
+ return IRQ_EINT0_2412 + offset;
+ else
+ return IRQ_EINT0 + offset;
+ }
+
+ if (offset < 8)
+ return IRQ_EINT4 + offset - 4;
+
+ return -EINVAL;
+}
+#endif
+
+#ifdef CONFIG_ARCH_S3C64XX
+static int s3c64xx_gpiolib_mbank_to_irq(struct gpio_chip *chip, unsigned pin)
+{
+ return pin < 5 ? IRQ_EINT(23) + pin : -ENXIO;
+}
+
+static int s3c64xx_gpiolib_lbank_to_irq(struct gpio_chip *chip, unsigned pin)
+{
+ return pin >= 8 ? IRQ_EINT(16) + pin - 8 : -ENXIO;
+}
+#endif
+
+struct samsung_gpio_chip s3c24xx_gpios[] = {
+#ifdef CONFIG_PLAT_S3C24XX
+ {
+ .config = &s3c24xx_gpiocfg_banka,
+ .chip = {
+ .base = S3C2410_GPA(0),
+ .owner = THIS_MODULE,
+ .label = "GPIOA",
+ .ngpio = 27,
+ .direction_input = s3c24xx_gpiolib_banka_input,
+ .direction_output = s3c24xx_gpiolib_banka_output,
+ },
+ }, {
+ .chip = {
+ .base = S3C2410_GPB(0),
+ .owner = THIS_MODULE,
+ .label = "GPIOB",
+ .ngpio = 11,
+ },
+ }, {
+ .chip = {
+ .base = S3C2410_GPC(0),
+ .owner = THIS_MODULE,
+ .label = "GPIOC",
+ .ngpio = 16,
+ },
+ }, {
+ .chip = {
+ .base = S3C2410_GPD(0),
+ .owner = THIS_MODULE,
+ .label = "GPIOD",
+ .ngpio = 16,
+ },
+ }, {
+ .chip = {
+ .base = S3C2410_GPE(0),
+ .label = "GPIOE",
+ .owner = THIS_MODULE,
+ .ngpio = 16,
+ },
+ }, {
+ .chip = {
+ .base = S3C2410_GPF(0),
+ .owner = THIS_MODULE,
+ .label = "GPIOF",
+ .ngpio = 8,
+ .to_irq = s3c24xx_gpiolib_fbank_to_irq,
+ },
+ }, {
+ .irq_base = IRQ_EINT8,
+ .chip = {
+ .base = S3C2410_GPG(0),
+ .owner = THIS_MODULE,
+ .label = "GPIOG",
+ .ngpio = 16,
+ .to_irq = samsung_gpiolib_to_irq,
+ },
+ }, {
+ .chip = {
+ .base = S3C2410_GPH(0),
+ .owner = THIS_MODULE,
+ .label = "GPIOH",
+ .ngpio = 15,
+ },
+ },
+ /* GPIOS for the S3C2443 and later devices. */
+ {
+ .base = S3C2440_GPJCON,
+ .chip = {
+ .base = S3C2410_GPJ(0),
+ .owner = THIS_MODULE,
+ .label = "GPIOJ",
+ .ngpio = 16,
+ },
+ }, {
+ .base = S3C2443_GPKCON,
+ .chip = {
+ .base = S3C2410_GPK(0),
+ .owner = THIS_MODULE,
+ .label = "GPIOK",
+ .ngpio = 16,
+ },
+ }, {
+ .base = S3C2443_GPLCON,
+ .chip = {
+ .base = S3C2410_GPL(0),
+ .owner = THIS_MODULE,
+ .label = "GPIOL",
+ .ngpio = 15,
+ },
+ }, {
+ .base = S3C2443_GPMCON,
+ .chip = {
+ .base = S3C2410_GPM(0),
+ .owner = THIS_MODULE,
+ .label = "GPIOM",
+ .ngpio = 2,
+ },
+ },
+#endif
+};
+
+/*
+ * 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
+ */
+
+static struct samsung_gpio_chip s3c64xx_gpios_4bit[] = {
+#ifdef CONFIG_ARCH_S3C64XX
+ {
+ .chip = {
+ .base = S3C64XX_GPA(0),
+ .ngpio = S3C64XX_GPIO_A_NR,
+ .label = "GPA",
+ },
+ }, {
+ .chip = {
+ .base = S3C64XX_GPB(0),
+ .ngpio = S3C64XX_GPIO_B_NR,
+ .label = "GPB",
+ },
+ }, {
+ .chip = {
+ .base = S3C64XX_GPC(0),
+ .ngpio = S3C64XX_GPIO_C_NR,
+ .label = "GPC",
+ },
+ }, {
+ .chip = {
+ .base = S3C64XX_GPD(0),
+ .ngpio = S3C64XX_GPIO_D_NR,
+ .label = "GPD",
+ },
+ }, {
+ .config = &samsung_gpio_cfgs[0],
+ .chip = {
+ .base = S3C64XX_GPE(0),
+ .ngpio = S3C64XX_GPIO_E_NR,
+ .label = "GPE",
+ },
+ }, {
+ .base = S3C64XX_GPG_BASE,
+ .chip = {
+ .base = S3C64XX_GPG(0),
+ .ngpio = S3C64XX_GPIO_G_NR,
+ .label = "GPG",
+ },
+ }, {
+ .base = S3C64XX_GPM_BASE,
+ .config = &samsung_gpio_cfgs[1],
+ .chip = {
+ .base = S3C64XX_GPM(0),
+ .ngpio = S3C64XX_GPIO_M_NR,
+ .label = "GPM",
+ .to_irq = s3c64xx_gpiolib_mbank_to_irq,
+ },
+ },
+#endif
+};
+
+static struct samsung_gpio_chip s3c64xx_gpios_4bit2[] = {
+#ifdef CONFIG_ARCH_S3C64XX
+ {
+ .base = S3C64XX_GPH_BASE + 0x4,
+ .chip = {
+ .base = S3C64XX_GPH(0),
+ .ngpio = S3C64XX_GPIO_H_NR,
+ .label = "GPH",
+ },
+ }, {
+ .base = S3C64XX_GPK_BASE + 0x4,
+ .config = &samsung_gpio_cfgs[0],
+ .chip = {
+ .base = S3C64XX_GPK(0),
+ .ngpio = S3C64XX_GPIO_K_NR,
+ .label = "GPK",
+ },
+ }, {
+ .base = S3C64XX_GPL_BASE + 0x4,
+ .config = &samsung_gpio_cfgs[1],
+ .chip = {
+ .base = S3C64XX_GPL(0),
+ .ngpio = S3C64XX_GPIO_L_NR,
+ .label = "GPL",
+ .to_irq = s3c64xx_gpiolib_lbank_to_irq,
+ },
+ },
+#endif
+};
+
+static struct samsung_gpio_chip s3c64xx_gpios_2bit[] = {
+#ifdef CONFIG_ARCH_S3C64XX
+ {
+ .base = S3C64XX_GPF_BASE,
+ .config = &samsung_gpio_cfgs[6],
+ .chip = {
+ .base = S3C64XX_GPF(0),
+ .ngpio = S3C64XX_GPIO_F_NR,
+ .label = "GPF",
+ },
+ }, {
+ .config = &samsung_gpio_cfgs[7],
+ .chip = {
+ .base = S3C64XX_GPI(0),
+ .ngpio = S3C64XX_GPIO_I_NR,
+ .label = "GPI",
+ },
+ }, {
+ .config = &samsung_gpio_cfgs[7],
+ .chip = {
+ .base = S3C64XX_GPJ(0),
+ .ngpio = S3C64XX_GPIO_J_NR,
+ .label = "GPJ",
+ },
+ }, {
+ .config = &samsung_gpio_cfgs[6],
+ .chip = {
+ .base = S3C64XX_GPO(0),
+ .ngpio = S3C64XX_GPIO_O_NR,
+ .label = "GPO",
+ },
+ }, {
+ .config = &samsung_gpio_cfgs[6],
+ .chip = {
+ .base = S3C64XX_GPP(0),
+ .ngpio = S3C64XX_GPIO_P_NR,
+ .label = "GPP",
+ },
+ }, {
+ .config = &samsung_gpio_cfgs[6],
+ .chip = {
+ .base = S3C64XX_GPQ(0),
+ .ngpio = S3C64XX_GPIO_Q_NR,
+ .label = "GPQ",
+ },
+ }, {
+ .base = S3C64XX_GPN_BASE,
+ .irq_base = IRQ_EINT(0),
+ .config = &samsung_gpio_cfgs[5],
+ .chip = {
+ .base = S3C64XX_GPN(0),
+ .ngpio = S3C64XX_GPIO_N_NR,
+ .label = "GPN",
+ .to_irq = samsung_gpiolib_to_irq,
+ },
+ },
+#endif
+};
+
+/* TODO: cleanup soc_is_* */
+static __init int samsung_gpiolib_init(void)
+{
+ /*
+ * Currently there are two drivers that can provide GPIO support for
+ * Samsung SoCs. For device tree enabled platforms, the new
+ * pinctrl-samsung driver is used, providing both GPIO and pin control
+ * interfaces. For legacy (non-DT) platforms this driver is used.
+ */
+ if (of_have_populated_dt())
+ return -ENODEV;
+
+ samsung_gpiolib_set_cfg(samsung_gpio_cfgs, ARRAY_SIZE(samsung_gpio_cfgs));
+
+ if (soc_is_s3c24xx()) {
+ s3c24xx_gpiolib_add_chips(s3c24xx_gpios,
+ ARRAY_SIZE(s3c24xx_gpios), S3C24XX_VA_GPIO);
+ } else if (soc_is_s3c64xx()) {
+ samsung_gpiolib_add_2bit_chips(s3c64xx_gpios_2bit,
+ ARRAY_SIZE(s3c64xx_gpios_2bit),
+ S3C64XX_VA_GPIO + 0xE0, 0x20);
+ samsung_gpiolib_add_4bit_chips(s3c64xx_gpios_4bit,
+ ARRAY_SIZE(s3c64xx_gpios_4bit),
+ S3C64XX_VA_GPIO);
+ samsung_gpiolib_add_4bit2_chips(s3c64xx_gpios_4bit2,
+ ARRAY_SIZE(s3c64xx_gpios_4bit2));
+ } else {
+ WARN(1, "Unknown SoC in gpio-samsung, no GPIOs added\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+core_initcall(samsung_gpiolib_init);
+
+int s3c_gpio_cfgpin(unsigned int pin, unsigned int config)
+{
+ struct samsung_gpio_chip *chip = samsung_gpiolib_getchip(pin);
+ unsigned long flags;
+ int offset;
+ int ret;
+
+ if (!chip)
+ return -EINVAL;
+
+ offset = pin - chip->chip.base;
+
+ samsung_gpio_lock(chip, flags);
+ ret = samsung_gpio_do_setcfg(chip, offset, config);
+ samsung_gpio_unlock(chip, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(s3c_gpio_cfgpin);
+
+int s3c_gpio_cfgpin_range(unsigned int start, unsigned int nr,
+ unsigned int cfg)
+{
+ int ret;
+
+ for (; nr > 0; nr--, start++) {
+ ret = s3c_gpio_cfgpin(start, cfg);
+ if (ret != 0)
+ return ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(s3c_gpio_cfgpin_range);
+
+int s3c_gpio_cfgall_range(unsigned int start, unsigned int nr,
+ unsigned int cfg, samsung_gpio_pull_t pull)
+{
+ int ret;
+
+ for (; nr > 0; nr--, start++) {
+ s3c_gpio_setpull(start, pull);
+ ret = s3c_gpio_cfgpin(start, cfg);
+ if (ret != 0)
+ return ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(s3c_gpio_cfgall_range);
+
+unsigned s3c_gpio_getcfg(unsigned int pin)
+{
+ struct samsung_gpio_chip *chip = samsung_gpiolib_getchip(pin);
+ unsigned long flags;
+ unsigned ret = 0;
+ int offset;
+
+ if (chip) {
+ offset = pin - chip->chip.base;
+
+ samsung_gpio_lock(chip, flags);
+ ret = samsung_gpio_do_getcfg(chip, offset);
+ samsung_gpio_unlock(chip, flags);
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(s3c_gpio_getcfg);
+
+int s3c_gpio_setpull(unsigned int pin, samsung_gpio_pull_t pull)
+{
+ struct samsung_gpio_chip *chip = samsung_gpiolib_getchip(pin);
+ unsigned long flags;
+ int offset, ret;
+
+ if (!chip)
+ return -EINVAL;
+
+ offset = pin - chip->chip.base;
+
+ samsung_gpio_lock(chip, flags);
+ ret = samsung_gpio_do_setpull(chip, offset, pull);
+ samsung_gpio_unlock(chip, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(s3c_gpio_setpull);
+
+samsung_gpio_pull_t s3c_gpio_getpull(unsigned int pin)
+{
+ struct samsung_gpio_chip *chip = samsung_gpiolib_getchip(pin);
+ unsigned long flags;
+ int offset;
+ u32 pup = 0;
+
+ if (chip) {
+ offset = pin - chip->chip.base;
+
+ samsung_gpio_lock(chip, flags);
+ pup = samsung_gpio_do_getpull(chip, offset);
+ samsung_gpio_unlock(chip, flags);
+ }
+
+ return (__force samsung_gpio_pull_t)pup;
+}
+EXPORT_SYMBOL(s3c_gpio_getpull);
+
+#ifdef CONFIG_PLAT_S3C24XX
+unsigned int s3c2410_modify_misccr(unsigned int clear, unsigned int change)
+{
+ unsigned long flags;
+ unsigned long misccr;
+
+ local_irq_save(flags);
+ misccr = __raw_readl(S3C24XX_MISCCR);
+ misccr &= ~clear;
+ misccr ^= change;
+ __raw_writel(misccr, S3C24XX_MISCCR);
+ local_irq_restore(flags);
+
+ return misccr;
+}
+EXPORT_SYMBOL(s3c2410_modify_misccr);
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 01:23:11 +0000