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authorGrant Likely <grant.likely@secretlab.ca>2011-05-27 01:30:03 +0200
committerGrant Likely <grant.likely@secretlab.ca>2011-05-27 01:30:03 +0200
commit37d72457644a1ded37d57dd9ae664e4e228a034d (patch)
treea3fc8147452e79ae45b4b912ba5ab16161a0e2fa /arch/arm/plat-nomadik/gpio.c
parentgpio: move U300 GPIO driver to drivers/gpio (diff)
downloadlinux-37d72457644a1ded37d57dd9ae664e4e228a034d.tar.xz
linux-37d72457644a1ded37d57dd9ae664e4e228a034d.zip
gpio: move Nomadik GPIO driver to drivers/gpio
This moves the Nomadik GPIO driver out of arch/arm/plat-nomadik and into the desired location indicated by the subsystem maintainer. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> [grant.likely: squashed with kconfig fixup] Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'arch/arm/plat-nomadik/gpio.c')
-rw-r--r--arch/arm/plat-nomadik/gpio.c1020
1 files changed, 0 insertions, 1020 deletions
diff --git a/arch/arm/plat-nomadik/gpio.c b/arch/arm/plat-nomadik/gpio.c
deleted file mode 100644
index 307b8131aa8c..000000000000
--- a/arch/arm/plat-nomadik/gpio.c
+++ /dev/null
@@ -1,1020 +0,0 @@
-/*
- * Generic GPIO driver for logic cells found in the Nomadik SoC
- *
- * Copyright (C) 2008,2009 STMicroelectronics
- * Copyright (C) 2009 Alessandro Rubini <rubini@unipv.it>
- * Rewritten based on work by Prafulla WADASKAR <prafulla.wadaskar@st.com>
- *
- * 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/module.h>
-#include <linux/init.h>
-#include <linux/device.h>
-#include <linux/platform_device.h>
-#include <linux/io.h>
-#include <linux/clk.h>
-#include <linux/err.h>
-#include <linux/gpio.h>
-#include <linux/spinlock.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/slab.h>
-
-#include <asm/mach/irq.h>
-
-#include <plat/pincfg.h>
-#include <mach/hardware.h>
-#include <mach/gpio.h>
-
-/*
- * The GPIO module in the Nomadik family of Systems-on-Chip is an
- * AMBA device, managing 32 pins and alternate functions. The logic block
- * is currently used in the Nomadik and ux500.
- *
- * Symbols in this file are called "nmk_gpio" for "nomadik gpio"
- */
-
-#define NMK_GPIO_PER_CHIP 32
-
-struct nmk_gpio_chip {
- struct gpio_chip chip;
- void __iomem *addr;
- struct clk *clk;
- unsigned int bank;
- unsigned int parent_irq;
- int secondary_parent_irq;
- u32 (*get_secondary_status)(unsigned int bank);
- void (*set_ioforce)(bool enable);
- spinlock_t lock;
- /* Keep track of configured edges */
- u32 edge_rising;
- u32 edge_falling;
- u32 real_wake;
- u32 rwimsc;
- u32 fwimsc;
- u32 slpm;
- u32 enabled;
-};
-
-static struct nmk_gpio_chip *
-nmk_gpio_chips[DIV_ROUND_UP(ARCH_NR_GPIOS, NMK_GPIO_PER_CHIP)];
-
-static DEFINE_SPINLOCK(nmk_gpio_slpm_lock);
-
-#define NUM_BANKS ARRAY_SIZE(nmk_gpio_chips)
-
-static void __nmk_gpio_set_mode(struct nmk_gpio_chip *nmk_chip,
- unsigned offset, int gpio_mode)
-{
- u32 bit = 1 << offset;
- u32 afunc, bfunc;
-
- afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~bit;
- bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~bit;
- if (gpio_mode & NMK_GPIO_ALT_A)
- afunc |= bit;
- if (gpio_mode & NMK_GPIO_ALT_B)
- bfunc |= bit;
- writel(afunc, nmk_chip->addr + NMK_GPIO_AFSLA);
- writel(bfunc, nmk_chip->addr + NMK_GPIO_AFSLB);
-}
-
-static void __nmk_gpio_set_slpm(struct nmk_gpio_chip *nmk_chip,
- unsigned offset, enum nmk_gpio_slpm mode)
-{
- u32 bit = 1 << offset;
- u32 slpm;
-
- slpm = readl(nmk_chip->addr + NMK_GPIO_SLPC);
- if (mode == NMK_GPIO_SLPM_NOCHANGE)
- slpm |= bit;
- else
- slpm &= ~bit;
- writel(slpm, nmk_chip->addr + NMK_GPIO_SLPC);
-}
-
-static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip,
- unsigned offset, enum nmk_gpio_pull pull)
-{
- u32 bit = 1 << offset;
- u32 pdis;
-
- pdis = readl(nmk_chip->addr + NMK_GPIO_PDIS);
- if (pull == NMK_GPIO_PULL_NONE)
- pdis |= bit;
- else
- pdis &= ~bit;
- writel(pdis, nmk_chip->addr + NMK_GPIO_PDIS);
-
- if (pull == NMK_GPIO_PULL_UP)
- writel(bit, nmk_chip->addr + NMK_GPIO_DATS);
- else if (pull == NMK_GPIO_PULL_DOWN)
- writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
-}
-
-static void __nmk_gpio_make_input(struct nmk_gpio_chip *nmk_chip,
- unsigned offset)
-{
- writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);
-}
-
-static void __nmk_gpio_set_output(struct nmk_gpio_chip *nmk_chip,
- unsigned offset, int val)
-{
- if (val)
- writel(1 << offset, nmk_chip->addr + NMK_GPIO_DATS);
- else
- writel(1 << offset, nmk_chip->addr + NMK_GPIO_DATC);
-}
-
-static void __nmk_gpio_make_output(struct nmk_gpio_chip *nmk_chip,
- unsigned offset, int val)
-{
- writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRS);
- __nmk_gpio_set_output(nmk_chip, offset, val);
-}
-
-static void __nmk_gpio_set_mode_safe(struct nmk_gpio_chip *nmk_chip,
- unsigned offset, int gpio_mode,
- bool glitch)
-{
- u32 rwimsc = readl(nmk_chip->addr + NMK_GPIO_RWIMSC);
- u32 fwimsc = readl(nmk_chip->addr + NMK_GPIO_FWIMSC);
-
- if (glitch && nmk_chip->set_ioforce) {
- u32 bit = BIT(offset);
-
- /* Prevent spurious wakeups */
- writel(rwimsc & ~bit, nmk_chip->addr + NMK_GPIO_RWIMSC);
- writel(fwimsc & ~bit, nmk_chip->addr + NMK_GPIO_FWIMSC);
-
- nmk_chip->set_ioforce(true);
- }
-
- __nmk_gpio_set_mode(nmk_chip, offset, gpio_mode);
-
- if (glitch && nmk_chip->set_ioforce) {
- nmk_chip->set_ioforce(false);
-
- writel(rwimsc, nmk_chip->addr + NMK_GPIO_RWIMSC);
- writel(fwimsc, nmk_chip->addr + NMK_GPIO_FWIMSC);
- }
-}
-
-static void __nmk_config_pin(struct nmk_gpio_chip *nmk_chip, unsigned offset,
- pin_cfg_t cfg, bool sleep, unsigned int *slpmregs)
-{
- static const char *afnames[] = {
- [NMK_GPIO_ALT_GPIO] = "GPIO",
- [NMK_GPIO_ALT_A] = "A",
- [NMK_GPIO_ALT_B] = "B",
- [NMK_GPIO_ALT_C] = "C"
- };
- static const char *pullnames[] = {
- [NMK_GPIO_PULL_NONE] = "none",
- [NMK_GPIO_PULL_UP] = "up",
- [NMK_GPIO_PULL_DOWN] = "down",
- [3] /* illegal */ = "??"
- };
- static const char *slpmnames[] = {
- [NMK_GPIO_SLPM_INPUT] = "input/wakeup",
- [NMK_GPIO_SLPM_NOCHANGE] = "no-change/no-wakeup",
- };
-
- int pin = PIN_NUM(cfg);
- int pull = PIN_PULL(cfg);
- int af = PIN_ALT(cfg);
- int slpm = PIN_SLPM(cfg);
- int output = PIN_DIR(cfg);
- int val = PIN_VAL(cfg);
- bool glitch = af == NMK_GPIO_ALT_C;
-
- dev_dbg(nmk_chip->chip.dev, "pin %d [%#lx]: af %s, pull %s, slpm %s (%s%s)\n",
- pin, cfg, afnames[af], pullnames[pull], slpmnames[slpm],
- output ? "output " : "input",
- output ? (val ? "high" : "low") : "");
-
- if (sleep) {
- int slpm_pull = PIN_SLPM_PULL(cfg);
- int slpm_output = PIN_SLPM_DIR(cfg);
- int slpm_val = PIN_SLPM_VAL(cfg);
-
- af = NMK_GPIO_ALT_GPIO;
-
- /*
- * The SLPM_* values are normal values + 1 to allow zero to
- * mean "same as normal".
- */
- if (slpm_pull)
- pull = slpm_pull - 1;
- if (slpm_output)
- output = slpm_output - 1;
- if (slpm_val)
- val = slpm_val - 1;
-
- dev_dbg(nmk_chip->chip.dev, "pin %d: sleep pull %s, dir %s, val %s\n",
- pin,
- slpm_pull ? pullnames[pull] : "same",
- slpm_output ? (output ? "output" : "input") : "same",
- slpm_val ? (val ? "high" : "low") : "same");
- }
-
- if (output)
- __nmk_gpio_make_output(nmk_chip, offset, val);
- else {
- __nmk_gpio_make_input(nmk_chip, offset);
- __nmk_gpio_set_pull(nmk_chip, offset, pull);
- }
-
- /*
- * If we've backed up the SLPM registers (glitch workaround), modify
- * the backups since they will be restored.
- */
- if (slpmregs) {
- if (slpm == NMK_GPIO_SLPM_NOCHANGE)
- slpmregs[nmk_chip->bank] |= BIT(offset);
- else
- slpmregs[nmk_chip->bank] &= ~BIT(offset);
- } else
- __nmk_gpio_set_slpm(nmk_chip, offset, slpm);
-
- __nmk_gpio_set_mode_safe(nmk_chip, offset, af, glitch);
-}
-
-/*
- * Safe sequence used to switch IOs between GPIO and Alternate-C mode:
- * - Save SLPM registers
- * - Set SLPM=0 for the IOs you want to switch and others to 1
- * - Configure the GPIO registers for the IOs that are being switched
- * - Set IOFORCE=1
- * - Modify the AFLSA/B registers for the IOs that are being switched
- * - Set IOFORCE=0
- * - Restore SLPM registers
- * - Any spurious wake up event during switch sequence to be ignored and
- * cleared
- */
-static void nmk_gpio_glitch_slpm_init(unsigned int *slpm)
-{
- int i;
-
- for (i = 0; i < NUM_BANKS; i++) {
- struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
- unsigned int temp = slpm[i];
-
- if (!chip)
- break;
-
- slpm[i] = readl(chip->addr + NMK_GPIO_SLPC);
- writel(temp, chip->addr + NMK_GPIO_SLPC);
- }
-}
-
-static void nmk_gpio_glitch_slpm_restore(unsigned int *slpm)
-{
- int i;
-
- for (i = 0; i < NUM_BANKS; i++) {
- struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
-
- if (!chip)
- break;
-
- writel(slpm[i], chip->addr + NMK_GPIO_SLPC);
- }
-}
-
-static int __nmk_config_pins(pin_cfg_t *cfgs, int num, bool sleep)
-{
- static unsigned int slpm[NUM_BANKS];
- unsigned long flags;
- bool glitch = false;
- int ret = 0;
- int i;
-
- for (i = 0; i < num; i++) {
- if (PIN_ALT(cfgs[i]) == NMK_GPIO_ALT_C) {
- glitch = true;
- break;
- }
- }
-
- spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
-
- if (glitch) {
- memset(slpm, 0xff, sizeof(slpm));
-
- for (i = 0; i < num; i++) {
- int pin = PIN_NUM(cfgs[i]);
- int offset = pin % NMK_GPIO_PER_CHIP;
-
- if (PIN_ALT(cfgs[i]) == NMK_GPIO_ALT_C)
- slpm[pin / NMK_GPIO_PER_CHIP] &= ~BIT(offset);
- }
-
- nmk_gpio_glitch_slpm_init(slpm);
- }
-
- for (i = 0; i < num; i++) {
- struct nmk_gpio_chip *nmk_chip;
- int pin = PIN_NUM(cfgs[i]);
-
- nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(pin));
- if (!nmk_chip) {
- ret = -EINVAL;
- break;
- }
-
- spin_lock(&nmk_chip->lock);
- __nmk_config_pin(nmk_chip, pin - nmk_chip->chip.base,
- cfgs[i], sleep, glitch ? slpm : NULL);
- spin_unlock(&nmk_chip->lock);
- }
-
- if (glitch)
- nmk_gpio_glitch_slpm_restore(slpm);
-
- spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
-
- return ret;
-}
-
-/**
- * nmk_config_pin - configure a pin's mux attributes
- * @cfg: pin confguration
- *
- * Configures a pin's mode (alternate function or GPIO), its pull up status,
- * and its sleep mode based on the specified configuration. The @cfg is
- * usually one of the SoC specific macros defined in mach/<soc>-pins.h. These
- * are constructed using, and can be further enhanced with, the macros in
- * plat/pincfg.h.
- *
- * If a pin's mode is set to GPIO, it is configured as an input to avoid
- * side-effects. The gpio can be manipulated later using standard GPIO API
- * calls.
- */
-int nmk_config_pin(pin_cfg_t cfg, bool sleep)
-{
- return __nmk_config_pins(&cfg, 1, sleep);
-}
-EXPORT_SYMBOL(nmk_config_pin);
-
-/**
- * nmk_config_pins - configure several pins at once
- * @cfgs: array of pin configurations
- * @num: number of elments in the array
- *
- * Configures several pins using nmk_config_pin(). Refer to that function for
- * further information.
- */
-int nmk_config_pins(pin_cfg_t *cfgs, int num)
-{
- return __nmk_config_pins(cfgs, num, false);
-}
-EXPORT_SYMBOL(nmk_config_pins);
-
-int nmk_config_pins_sleep(pin_cfg_t *cfgs, int num)
-{
- return __nmk_config_pins(cfgs, num, true);
-}
-EXPORT_SYMBOL(nmk_config_pins_sleep);
-
-/**
- * nmk_gpio_set_slpm() - configure the sleep mode of a pin
- * @gpio: pin number
- * @mode: NMK_GPIO_SLPM_INPUT or NMK_GPIO_SLPM_NOCHANGE,
- *
- * Sets the sleep mode of a pin. If @mode is NMK_GPIO_SLPM_INPUT, the pin is
- * changed to an input (with pullup/down enabled) in sleep and deep sleep. If
- * @mode is NMK_GPIO_SLPM_NOCHANGE, the pin remains in the state it was
- * configured even when in sleep and deep sleep.
- *
- * On DB8500v2 onwards, this setting loses the previous meaning and instead
- * indicates if wakeup detection is enabled on the pin. Note that
- * enable_irq_wake() will automatically enable wakeup detection.
- */
-int nmk_gpio_set_slpm(int gpio, enum nmk_gpio_slpm mode)
-{
- struct nmk_gpio_chip *nmk_chip;
- unsigned long flags;
-
- nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
- if (!nmk_chip)
- return -EINVAL;
-
- spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
- spin_lock(&nmk_chip->lock);
-
- __nmk_gpio_set_slpm(nmk_chip, gpio - nmk_chip->chip.base, mode);
-
- spin_unlock(&nmk_chip->lock);
- spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
-
- return 0;
-}
-
-/**
- * nmk_gpio_set_pull() - enable/disable pull up/down on a gpio
- * @gpio: pin number
- * @pull: one of NMK_GPIO_PULL_DOWN, NMK_GPIO_PULL_UP, and NMK_GPIO_PULL_NONE
- *
- * Enables/disables pull up/down on a specified pin. This only takes effect if
- * the pin is configured as an input (either explicitly or by the alternate
- * function).
- *
- * NOTE: If enabling the pull up/down, the caller must ensure that the GPIO is
- * configured as an input. Otherwise, due to the way the controller registers
- * work, this function will change the value output on the pin.
- */
-int nmk_gpio_set_pull(int gpio, enum nmk_gpio_pull pull)
-{
- struct nmk_gpio_chip *nmk_chip;
- unsigned long flags;
-
- nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
- if (!nmk_chip)
- return -EINVAL;
-
- spin_lock_irqsave(&nmk_chip->lock, flags);
- __nmk_gpio_set_pull(nmk_chip, gpio - nmk_chip->chip.base, pull);
- spin_unlock_irqrestore(&nmk_chip->lock, flags);
-
- return 0;
-}
-
-/* Mode functions */
-/**
- * nmk_gpio_set_mode() - set the mux mode of a gpio pin
- * @gpio: pin number
- * @gpio_mode: one of NMK_GPIO_ALT_GPIO, NMK_GPIO_ALT_A,
- * NMK_GPIO_ALT_B, and NMK_GPIO_ALT_C
- *
- * Sets the mode of the specified pin to one of the alternate functions or
- * plain GPIO.
- */
-int nmk_gpio_set_mode(int gpio, int gpio_mode)
-{
- struct nmk_gpio_chip *nmk_chip;
- unsigned long flags;
-
- nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
- if (!nmk_chip)
- return -EINVAL;
-
- spin_lock_irqsave(&nmk_chip->lock, flags);
- __nmk_gpio_set_mode(nmk_chip, gpio - nmk_chip->chip.base, gpio_mode);
- spin_unlock_irqrestore(&nmk_chip->lock, flags);
-
- return 0;
-}
-EXPORT_SYMBOL(nmk_gpio_set_mode);
-
-int nmk_gpio_get_mode(int gpio)
-{
- struct nmk_gpio_chip *nmk_chip;
- u32 afunc, bfunc, bit;
-
- nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
- if (!nmk_chip)
- return -EINVAL;
-
- bit = 1 << (gpio - nmk_chip->chip.base);
-
- afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & bit;
- bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & bit;
-
- return (afunc ? NMK_GPIO_ALT_A : 0) | (bfunc ? NMK_GPIO_ALT_B : 0);
-}
-EXPORT_SYMBOL(nmk_gpio_get_mode);
-
-
-/* IRQ functions */
-static inline int nmk_gpio_get_bitmask(int gpio)
-{
- return 1 << (gpio % 32);
-}
-
-static void nmk_gpio_irq_ack(struct irq_data *d)
-{
- int gpio;
- struct nmk_gpio_chip *nmk_chip;
-
- gpio = NOMADIK_IRQ_TO_GPIO(d->irq);
- nmk_chip = irq_data_get_irq_chip_data(d);
- if (!nmk_chip)
- return;
- writel(nmk_gpio_get_bitmask(gpio), nmk_chip->addr + NMK_GPIO_IC);
-}
-
-enum nmk_gpio_irq_type {
- NORMAL,
- WAKE,
-};
-
-static void __nmk_gpio_irq_modify(struct nmk_gpio_chip *nmk_chip,
- int gpio, enum nmk_gpio_irq_type which,
- bool enable)
-{
- u32 rimsc = which == WAKE ? NMK_GPIO_RWIMSC : NMK_GPIO_RIMSC;
- u32 fimsc = which == WAKE ? NMK_GPIO_FWIMSC : NMK_GPIO_FIMSC;
- u32 bitmask = nmk_gpio_get_bitmask(gpio);
- u32 reg;
-
- /* we must individually set/clear the two edges */
- if (nmk_chip->edge_rising & bitmask) {
- reg = readl(nmk_chip->addr + rimsc);
- if (enable)
- reg |= bitmask;
- else
- reg &= ~bitmask;
- writel(reg, nmk_chip->addr + rimsc);
- }
- if (nmk_chip->edge_falling & bitmask) {
- reg = readl(nmk_chip->addr + fimsc);
- if (enable)
- reg |= bitmask;
- else
- reg &= ~bitmask;
- writel(reg, nmk_chip->addr + fimsc);
- }
-}
-
-static void __nmk_gpio_set_wake(struct nmk_gpio_chip *nmk_chip,
- int gpio, bool on)
-{
- __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, on);
-}
-
-static int nmk_gpio_irq_maskunmask(struct irq_data *d, bool enable)
-{
- int gpio;
- struct nmk_gpio_chip *nmk_chip;
- unsigned long flags;
- u32 bitmask;
-
- gpio = NOMADIK_IRQ_TO_GPIO(d->irq);
- nmk_chip = irq_data_get_irq_chip_data(d);
- bitmask = nmk_gpio_get_bitmask(gpio);
- if (!nmk_chip)
- return -EINVAL;
-
- if (enable)
- nmk_chip->enabled |= bitmask;
- else
- nmk_chip->enabled &= ~bitmask;
-
- spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
- spin_lock(&nmk_chip->lock);
-
- __nmk_gpio_irq_modify(nmk_chip, gpio, NORMAL, enable);
-
- if (!(nmk_chip->real_wake & bitmask))
- __nmk_gpio_set_wake(nmk_chip, gpio, enable);
-
- spin_unlock(&nmk_chip->lock);
- spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
-
- return 0;
-}
-
-static void nmk_gpio_irq_mask(struct irq_data *d)
-{
- nmk_gpio_irq_maskunmask(d, false);
-}
-
-static void nmk_gpio_irq_unmask(struct irq_data *d)
-{
- nmk_gpio_irq_maskunmask(d, true);
-}
-
-static int nmk_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
-{
- struct nmk_gpio_chip *nmk_chip;
- unsigned long flags;
- u32 bitmask;
- int gpio;
-
- gpio = NOMADIK_IRQ_TO_GPIO(d->irq);
- nmk_chip = irq_data_get_irq_chip_data(d);
- if (!nmk_chip)
- return -EINVAL;
- bitmask = nmk_gpio_get_bitmask(gpio);
-
- spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
- spin_lock(&nmk_chip->lock);
-
- if (!(nmk_chip->enabled & bitmask))
- __nmk_gpio_set_wake(nmk_chip, gpio, on);
-
- if (on)
- nmk_chip->real_wake |= bitmask;
- else
- nmk_chip->real_wake &= ~bitmask;
-
- spin_unlock(&nmk_chip->lock);
- spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
-
- return 0;
-}
-
-static int nmk_gpio_irq_set_type(struct irq_data *d, unsigned int type)
-{
- bool enabled, wake = irqd_is_wakeup_set(d);
- int gpio;
- struct nmk_gpio_chip *nmk_chip;
- unsigned long flags;
- u32 bitmask;
-
- gpio = NOMADIK_IRQ_TO_GPIO(d->irq);
- nmk_chip = irq_data_get_irq_chip_data(d);
- bitmask = nmk_gpio_get_bitmask(gpio);
- if (!nmk_chip)
- return -EINVAL;
-
- if (type & IRQ_TYPE_LEVEL_HIGH)
- return -EINVAL;
- if (type & IRQ_TYPE_LEVEL_LOW)
- return -EINVAL;
-
- enabled = nmk_chip->enabled & bitmask;
-
- spin_lock_irqsave(&nmk_chip->lock, flags);
-
- if (enabled)
- __nmk_gpio_irq_modify(nmk_chip, gpio, NORMAL, false);
-
- if (enabled || wake)
- __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, false);
-
- nmk_chip->edge_rising &= ~bitmask;
- if (type & IRQ_TYPE_EDGE_RISING)
- nmk_chip->edge_rising |= bitmask;
-
- nmk_chip->edge_falling &= ~bitmask;
- if (type & IRQ_TYPE_EDGE_FALLING)
- nmk_chip->edge_falling |= bitmask;
-
- if (enabled)
- __nmk_gpio_irq_modify(nmk_chip, gpio, NORMAL, true);
-
- if (enabled || wake)
- __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, true);
-
- spin_unlock_irqrestore(&nmk_chip->lock, flags);
-
- return 0;
-}
-
-static struct irq_chip nmk_gpio_irq_chip = {
- .name = "Nomadik-GPIO",
- .irq_ack = nmk_gpio_irq_ack,
- .irq_mask = nmk_gpio_irq_mask,
- .irq_unmask = nmk_gpio_irq_unmask,
- .irq_set_type = nmk_gpio_irq_set_type,
- .irq_set_wake = nmk_gpio_irq_set_wake,
-};
-
-static void __nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc,
- u32 status)
-{
- struct nmk_gpio_chip *nmk_chip;
- struct irq_chip *host_chip = irq_get_chip(irq);
- unsigned int first_irq;
-
- chained_irq_enter(host_chip, desc);
-
- nmk_chip = irq_get_handler_data(irq);
- first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
- while (status) {
- int bit = __ffs(status);
-
- generic_handle_irq(first_irq + bit);
- status &= ~BIT(bit);
- }
-
- chained_irq_exit(host_chip, desc);
-}
-
-static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
-{
- struct nmk_gpio_chip *nmk_chip = irq_get_handler_data(irq);
- u32 status = readl(nmk_chip->addr + NMK_GPIO_IS);
-
- __nmk_gpio_irq_handler(irq, desc, status);
-}
-
-static void nmk_gpio_secondary_irq_handler(unsigned int irq,
- struct irq_desc *desc)
-{
- struct nmk_gpio_chip *nmk_chip = irq_get_handler_data(irq);
- u32 status = nmk_chip->get_secondary_status(nmk_chip->bank);
-
- __nmk_gpio_irq_handler(irq, desc, status);
-}
-
-static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip)
-{
- unsigned int first_irq;
- int i;
-
- first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
- for (i = first_irq; i < first_irq + nmk_chip->chip.ngpio; i++) {
- irq_set_chip_and_handler(i, &nmk_gpio_irq_chip,
- handle_edge_irq);
- set_irq_flags(i, IRQF_VALID);
- irq_set_chip_data(i, nmk_chip);
- irq_set_irq_type(i, IRQ_TYPE_EDGE_FALLING);
- }
-
- irq_set_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler);
- irq_set_handler_data(nmk_chip->parent_irq, nmk_chip);
-
- if (nmk_chip->secondary_parent_irq >= 0) {
- irq_set_chained_handler(nmk_chip->secondary_parent_irq,
- nmk_gpio_secondary_irq_handler);
- irq_set_handler_data(nmk_chip->secondary_parent_irq, nmk_chip);
- }
-
- return 0;
-}
-
-/* I/O Functions */
-static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset)
-{
- struct nmk_gpio_chip *nmk_chip =
- container_of(chip, struct nmk_gpio_chip, chip);
-
- writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);
- return 0;
-}
-
-static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset)
-{
- struct nmk_gpio_chip *nmk_chip =
- container_of(chip, struct nmk_gpio_chip, chip);
- u32 bit = 1 << offset;
-
- return (readl(nmk_chip->addr + NMK_GPIO_DAT) & bit) != 0;
-}
-
-static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset,
- int val)
-{
- struct nmk_gpio_chip *nmk_chip =
- container_of(chip, struct nmk_gpio_chip, chip);
-
- __nmk_gpio_set_output(nmk_chip, offset, val);
-}
-
-static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset,
- int val)
-{
- struct nmk_gpio_chip *nmk_chip =
- container_of(chip, struct nmk_gpio_chip, chip);
-
- __nmk_gpio_make_output(nmk_chip, offset, val);
-
- return 0;
-}
-
-static int nmk_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
-{
- struct nmk_gpio_chip *nmk_chip =
- container_of(chip, struct nmk_gpio_chip, chip);
-
- return NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base) + offset;
-}
-
-#ifdef CONFIG_DEBUG_FS
-
-#include <linux/seq_file.h>
-
-static void nmk_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
-{
- int mode;
- unsigned i;
- unsigned gpio = chip->base;
- int is_out;
- struct nmk_gpio_chip *nmk_chip =
- container_of(chip, struct nmk_gpio_chip, chip);
- const char *modes[] = {
- [NMK_GPIO_ALT_GPIO] = "gpio",
- [NMK_GPIO_ALT_A] = "altA",
- [NMK_GPIO_ALT_B] = "altB",
- [NMK_GPIO_ALT_C] = "altC",
- };
-
- for (i = 0; i < chip->ngpio; i++, gpio++) {
- const char *label = gpiochip_is_requested(chip, i);
- bool pull;
- u32 bit = 1 << i;
-
- if (!label)
- continue;
-
- is_out = readl(nmk_chip->addr + NMK_GPIO_DIR) & bit;
- pull = !(readl(nmk_chip->addr + NMK_GPIO_PDIS) & bit);
- mode = nmk_gpio_get_mode(gpio);
- seq_printf(s, " gpio-%-3d (%-20.20s) %s %s %s %s",
- gpio, label,
- is_out ? "out" : "in ",
- chip->get
- ? (chip->get(chip, i) ? "hi" : "lo")
- : "? ",
- (mode < 0) ? "unknown" : modes[mode],
- pull ? "pull" : "none");
- seq_printf(s, "\n");
- }
-}
-
-#else
-#define nmk_gpio_dbg_show NULL
-#endif
-
-/* This structure is replicated for each GPIO block allocated at probe time */
-static struct gpio_chip nmk_gpio_template = {
- .direction_input = nmk_gpio_make_input,
- .get = nmk_gpio_get_input,
- .direction_output = nmk_gpio_make_output,
- .set = nmk_gpio_set_output,
- .to_irq = nmk_gpio_to_irq,
- .dbg_show = nmk_gpio_dbg_show,
- .can_sleep = 0,
-};
-
-/*
- * Called from the suspend/resume path to only keep the real wakeup interrupts
- * (those that have had set_irq_wake() called on them) as wakeup interrupts,
- * and not the rest of the interrupts which we needed to have as wakeups for
- * cpuidle.
- *
- * PM ops are not used since this needs to be done at the end, after all the
- * other drivers are done with their suspend callbacks.
- */
-void nmk_gpio_wakeups_suspend(void)
-{
- int i;
-
- for (i = 0; i < NUM_BANKS; i++) {
- struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
-
- if (!chip)
- break;
-
- chip->rwimsc = readl(chip->addr + NMK_GPIO_RWIMSC);
- chip->fwimsc = readl(chip->addr + NMK_GPIO_FWIMSC);
-
- writel(chip->rwimsc & chip->real_wake,
- chip->addr + NMK_GPIO_RWIMSC);
- writel(chip->fwimsc & chip->real_wake,
- chip->addr + NMK_GPIO_FWIMSC);
-
- if (cpu_is_u8500v2()) {
- chip->slpm = readl(chip->addr + NMK_GPIO_SLPC);
-
- /* 0 -> wakeup enable */
- writel(~chip->real_wake, chip->addr + NMK_GPIO_SLPC);
- }
- }
-}
-
-void nmk_gpio_wakeups_resume(void)
-{
- int i;
-
- for (i = 0; i < NUM_BANKS; i++) {
- struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
-
- if (!chip)
- break;
-
- writel(chip->rwimsc, chip->addr + NMK_GPIO_RWIMSC);
- writel(chip->fwimsc, chip->addr + NMK_GPIO_FWIMSC);
-
- if (cpu_is_u8500v2())
- writel(chip->slpm, chip->addr + NMK_GPIO_SLPC);
- }
-}
-
-static int __devinit nmk_gpio_probe(struct platform_device *dev)
-{
- struct nmk_gpio_platform_data *pdata = dev->dev.platform_data;
- struct nmk_gpio_chip *nmk_chip;
- struct gpio_chip *chip;
- struct resource *res;
- struct clk *clk;
- int secondary_irq;
- int irq;
- int ret;
-
- if (!pdata)
- return -ENODEV;
-
- res = platform_get_resource(dev, IORESOURCE_MEM, 0);
- if (!res) {
- ret = -ENOENT;
- goto out;
- }
-
- irq = platform_get_irq(dev, 0);
- if (irq < 0) {
- ret = irq;
- goto out;
- }
-
- secondary_irq = platform_get_irq(dev, 1);
- if (secondary_irq >= 0 && !pdata->get_secondary_status) {
- ret = -EINVAL;
- goto out;
- }
-
- if (request_mem_region(res->start, resource_size(res),
- dev_name(&dev->dev)) == NULL) {
- ret = -EBUSY;
- goto out;
- }
-
- clk = clk_get(&dev->dev, NULL);
- if (IS_ERR(clk)) {
- ret = PTR_ERR(clk);
- goto out_release;
- }
-
- clk_enable(clk);
-
- nmk_chip = kzalloc(sizeof(*nmk_chip), GFP_KERNEL);
- if (!nmk_chip) {
- ret = -ENOMEM;
- goto out_clk;
- }
- /*
- * The virt address in nmk_chip->addr is in the nomadik register space,
- * so we can simply convert the resource address, without remapping
- */
- nmk_chip->bank = dev->id;
- nmk_chip->clk = clk;
- nmk_chip->addr = io_p2v(res->start);
- nmk_chip->chip = nmk_gpio_template;
- nmk_chip->parent_irq = irq;
- nmk_chip->secondary_parent_irq = secondary_irq;
- nmk_chip->get_secondary_status = pdata->get_secondary_status;
- nmk_chip->set_ioforce = pdata->set_ioforce;
- spin_lock_init(&nmk_chip->lock);
-
- chip = &nmk_chip->chip;
- chip->base = pdata->first_gpio;
- chip->ngpio = pdata->num_gpio;
- chip->label = pdata->name ?: dev_name(&dev->dev);
- chip->dev = &dev->dev;
- chip->owner = THIS_MODULE;
-
- ret = gpiochip_add(&nmk_chip->chip);
- if (ret)
- goto out_free;
-
- BUG_ON(nmk_chip->bank >= ARRAY_SIZE(nmk_gpio_chips));
-
- nmk_gpio_chips[nmk_chip->bank] = nmk_chip;
- platform_set_drvdata(dev, nmk_chip);
-
- nmk_gpio_init_irq(nmk_chip);
-
- dev_info(&dev->dev, "Bits %i-%i at address %p\n",
- nmk_chip->chip.base, nmk_chip->chip.base+31, nmk_chip->addr);
- return 0;
-
-out_free:
- kfree(nmk_chip);
-out_clk:
- clk_disable(clk);
- clk_put(clk);
-out_release:
- release_mem_region(res->start, resource_size(res));
-out:
- dev_err(&dev->dev, "Failure %i for GPIO %i-%i\n", ret,
- pdata->first_gpio, pdata->first_gpio+31);
- return ret;
-}
-
-static struct platform_driver nmk_gpio_driver = {
- .driver = {
- .owner = THIS_MODULE,
- .name = "gpio",
- },
- .probe = nmk_gpio_probe,
-};
-
-static int __init nmk_gpio_init(void)
-{
- return platform_driver_register(&nmk_gpio_driver);
-}
-
-core_initcall(nmk_gpio_init);
-
-MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini");
-MODULE_DESCRIPTION("Nomadik GPIO Driver");
-MODULE_LICENSE("GPL");
-
-