summaryrefslogtreecommitdiff
path: root/arch/arm
diff options
context:
space:
mode:
authorDavid Brown <davidb@codeaurora.org>2011-05-16 15:53:38 -0700
committerDavid Brown <davidb@codeaurora.org>2011-08-01 04:58:00 -0700
commit1a5ab4b3e6087726dfc00207b36c91d3061468e8 (patch)
tree94ec8284560ff57fdf196d78b584a4d297b06fa8 /arch/arm
parent74d10d7461693ad001f81f0a380b44d526d3f1de (diff)
gpio_msm: Move Qualcomm MSM v2 gpio driver into drivers
Migrate the driver for the v7-based MSM chips into drivers/gpio. The driver is unchanged, only moved. Change-Id: I810db5b50b71cdca4e869aa0d0310f7f48781a55 Signed-off-by: David Brown <davidb@codeaurora.org> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/mach-msm/Kconfig1
-rw-r--r--arch/arm/mach-msm/Makefile6
-rw-r--r--arch/arm/mach-msm/gpio-v2.c433
3 files changed, 1 insertions, 439 deletions
diff --git a/arch/arm/mach-msm/Kconfig b/arch/arm/mach-msm/Kconfig
index cc7c0b21e2b8..f5cce3fe351a 100644
--- a/arch/arm/mach-msm/Kconfig
+++ b/arch/arm/mach-msm/Kconfig
@@ -47,6 +47,7 @@ config ARCH_MSM8X60
select ARM_GIC
select CPU_V7
select MSM_V2_TLMM
+ select GPIO_MSM_V2
select MSM_GPIOMUX
select MSM_SCM if SMP
diff --git a/arch/arm/mach-msm/Makefile b/arch/arm/mach-msm/Makefile
index c0709afd2130..7a227d1c144d 100644
--- a/arch/arm/mach-msm/Makefile
+++ b/arch/arm/mach-msm/Makefile
@@ -29,9 +29,3 @@ obj-$(CONFIG_ARCH_MSM8960) += board-msm8960.o devices-msm8960.o
obj-$(CONFIG_ARCH_MSM7X30) += gpiomux-v1.o gpiomux.o
obj-$(CONFIG_ARCH_QSD8X50) += gpiomux-8x50.o gpiomux-v1.o gpiomux.o
obj-$(CONFIG_ARCH_MSM8X60) += gpiomux-8x60.o gpiomux-v2.o gpiomux.o
-ifdef CONFIG_MSM_V2_TLMM
-ifndef CONFIG_ARCH_MSM8960
-# TODO: TLMM Mapping issues need to be resolved
-obj-y += gpio-v2.o
-endif
-endif
diff --git a/arch/arm/mach-msm/gpio-v2.c b/arch/arm/mach-msm/gpio-v2.c
deleted file mode 100644
index cc9c4fd7cccc..000000000000
--- a/arch/arm/mach-msm/gpio-v2.c
+++ /dev/null
@@ -1,433 +0,0 @@
-/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 and
- * only version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
- *
- */
-#define pr_fmt(fmt) "%s: " fmt, __func__
-
-#include <linux/bitmap.h>
-#include <linux/bitops.h>
-#include <linux/gpio.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/irq.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/spinlock.h>
-
-#include <asm/mach/irq.h>
-
-#include <mach/msm_iomap.h>
-#include "gpiomux.h"
-
-/* Bits of interest in the GPIO_IN_OUT register.
- */
-enum {
- GPIO_IN = 0,
- GPIO_OUT = 1
-};
-
-/* Bits of interest in the GPIO_INTR_STATUS register.
- */
-enum {
- INTR_STATUS = 0,
-};
-
-/* Bits of interest in the GPIO_CFG register.
- */
-enum {
- GPIO_OE = 9,
-};
-
-/* Bits of interest in the GPIO_INTR_CFG register.
- * When a GPIO triggers, two separate decisions are made, controlled
- * by two separate flags.
- *
- * - First, INTR_RAW_STATUS_EN controls whether or not the GPIO_INTR_STATUS
- * register for that GPIO will be updated to reflect the triggering of that
- * gpio. If this bit is 0, this register will not be updated.
- * - Second, INTR_ENABLE controls whether an interrupt is triggered.
- *
- * If INTR_ENABLE is set and INTR_RAW_STATUS_EN is NOT set, an interrupt
- * can be triggered but the status register will not reflect it.
- */
-enum {
- INTR_ENABLE = 0,
- INTR_POL_CTL = 1,
- INTR_DECT_CTL = 2,
- INTR_RAW_STATUS_EN = 3,
-};
-
-/* Codes of interest in GPIO_INTR_CFG_SU.
- */
-enum {
- TARGET_PROC_SCORPION = 4,
- TARGET_PROC_NONE = 7,
-};
-
-
-#define GPIO_INTR_CFG_SU(gpio) (MSM_TLMM_BASE + 0x0400 + (0x04 * (gpio)))
-#define GPIO_CONFIG(gpio) (MSM_TLMM_BASE + 0x1000 + (0x10 * (gpio)))
-#define GPIO_IN_OUT(gpio) (MSM_TLMM_BASE + 0x1004 + (0x10 * (gpio)))
-#define GPIO_INTR_CFG(gpio) (MSM_TLMM_BASE + 0x1008 + (0x10 * (gpio)))
-#define GPIO_INTR_STATUS(gpio) (MSM_TLMM_BASE + 0x100c + (0x10 * (gpio)))
-
-/**
- * struct msm_gpio_dev: the MSM8660 SoC GPIO device structure
- *
- * @enabled_irqs: a bitmap used to optimize the summary-irq handler. By
- * keeping track of which gpios are unmasked as irq sources, we avoid
- * having to do readl calls on hundreds of iomapped registers each time
- * the summary interrupt fires in order to locate the active interrupts.
- *
- * @wake_irqs: a bitmap for tracking which interrupt lines are enabled
- * as wakeup sources. When the device is suspended, interrupts which are
- * not wakeup sources are disabled.
- *
- * @dual_edge_irqs: a bitmap used to track which irqs are configured
- * as dual-edge, as this is not supported by the hardware and requires
- * some special handling in the driver.
- */
-struct msm_gpio_dev {
- struct gpio_chip gpio_chip;
- DECLARE_BITMAP(enabled_irqs, NR_GPIO_IRQS);
- DECLARE_BITMAP(wake_irqs, NR_GPIO_IRQS);
- DECLARE_BITMAP(dual_edge_irqs, NR_GPIO_IRQS);
-};
-
-static DEFINE_SPINLOCK(tlmm_lock);
-
-static inline struct msm_gpio_dev *to_msm_gpio_dev(struct gpio_chip *chip)
-{
- return container_of(chip, struct msm_gpio_dev, gpio_chip);
-}
-
-static inline void set_gpio_bits(unsigned n, void __iomem *reg)
-{
- writel(readl(reg) | n, reg);
-}
-
-static inline void clear_gpio_bits(unsigned n, void __iomem *reg)
-{
- writel(readl(reg) & ~n, reg);
-}
-
-static int msm_gpio_get(struct gpio_chip *chip, unsigned offset)
-{
- return readl(GPIO_IN_OUT(offset)) & BIT(GPIO_IN);
-}
-
-static void msm_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
-{
- writel(val ? BIT(GPIO_OUT) : 0, GPIO_IN_OUT(offset));
-}
-
-static int msm_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
-{
- unsigned long irq_flags;
-
- spin_lock_irqsave(&tlmm_lock, irq_flags);
- clear_gpio_bits(BIT(GPIO_OE), GPIO_CONFIG(offset));
- spin_unlock_irqrestore(&tlmm_lock, irq_flags);
- return 0;
-}
-
-static int msm_gpio_direction_output(struct gpio_chip *chip,
- unsigned offset,
- int val)
-{
- unsigned long irq_flags;
-
- spin_lock_irqsave(&tlmm_lock, irq_flags);
- msm_gpio_set(chip, offset, val);
- set_gpio_bits(BIT(GPIO_OE), GPIO_CONFIG(offset));
- spin_unlock_irqrestore(&tlmm_lock, irq_flags);
- return 0;
-}
-
-static int msm_gpio_request(struct gpio_chip *chip, unsigned offset)
-{
- return msm_gpiomux_get(chip->base + offset);
-}
-
-static void msm_gpio_free(struct gpio_chip *chip, unsigned offset)
-{
- msm_gpiomux_put(chip->base + offset);
-}
-
-static int msm_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
-{
- return MSM_GPIO_TO_INT(chip->base + offset);
-}
-
-static inline int msm_irq_to_gpio(struct gpio_chip *chip, unsigned irq)
-{
- return irq - MSM_GPIO_TO_INT(chip->base);
-}
-
-static struct msm_gpio_dev msm_gpio = {
- .gpio_chip = {
- .base = 0,
- .ngpio = NR_GPIO_IRQS,
- .direction_input = msm_gpio_direction_input,
- .direction_output = msm_gpio_direction_output,
- .get = msm_gpio_get,
- .set = msm_gpio_set,
- .to_irq = msm_gpio_to_irq,
- .request = msm_gpio_request,
- .free = msm_gpio_free,
- },
-};
-
-/* For dual-edge interrupts in software, since the hardware has no
- * such support:
- *
- * At appropriate moments, this function may be called to flip the polarity
- * settings of both-edge irq lines to try and catch the next edge.
- *
- * The attempt is considered successful if:
- * - the status bit goes high, indicating that an edge was caught, or
- * - the input value of the gpio doesn't change during the attempt.
- * If the value changes twice during the process, that would cause the first
- * test to fail but would force the second, as two opposite
- * transitions would cause a detection no matter the polarity setting.
- *
- * The do-loop tries to sledge-hammer closed the timing hole between
- * the initial value-read and the polarity-write - if the line value changes
- * during that window, an interrupt is lost, the new polarity setting is
- * incorrect, and the first success test will fail, causing a retry.
- *
- * Algorithm comes from Google's msmgpio driver, see mach-msm/gpio.c.
- */
-static void msm_gpio_update_dual_edge_pos(unsigned gpio)
-{
- int loop_limit = 100;
- unsigned val, val2, intstat;
-
- do {
- val = readl(GPIO_IN_OUT(gpio)) & BIT(GPIO_IN);
- if (val)
- clear_gpio_bits(BIT(INTR_POL_CTL), GPIO_INTR_CFG(gpio));
- else
- set_gpio_bits(BIT(INTR_POL_CTL), GPIO_INTR_CFG(gpio));
- val2 = readl(GPIO_IN_OUT(gpio)) & BIT(GPIO_IN);
- intstat = readl(GPIO_INTR_STATUS(gpio)) & BIT(INTR_STATUS);
- if (intstat || val == val2)
- return;
- } while (loop_limit-- > 0);
- pr_err("dual-edge irq failed to stabilize, "
- "interrupts dropped. %#08x != %#08x\n",
- val, val2);
-}
-
-static void msm_gpio_irq_ack(struct irq_data *d)
-{
- int gpio = msm_irq_to_gpio(&msm_gpio.gpio_chip, d->irq);
-
- writel(BIT(INTR_STATUS), GPIO_INTR_STATUS(gpio));
- if (test_bit(gpio, msm_gpio.dual_edge_irqs))
- msm_gpio_update_dual_edge_pos(gpio);
-}
-
-static void msm_gpio_irq_mask(struct irq_data *d)
-{
- int gpio = msm_irq_to_gpio(&msm_gpio.gpio_chip, d->irq);
- unsigned long irq_flags;
-
- spin_lock_irqsave(&tlmm_lock, irq_flags);
- writel(TARGET_PROC_NONE, GPIO_INTR_CFG_SU(gpio));
- clear_gpio_bits(INTR_RAW_STATUS_EN | INTR_ENABLE, GPIO_INTR_CFG(gpio));
- __clear_bit(gpio, msm_gpio.enabled_irqs);
- spin_unlock_irqrestore(&tlmm_lock, irq_flags);
-}
-
-static void msm_gpio_irq_unmask(struct irq_data *d)
-{
- int gpio = msm_irq_to_gpio(&msm_gpio.gpio_chip, d->irq);
- unsigned long irq_flags;
-
- spin_lock_irqsave(&tlmm_lock, irq_flags);
- __set_bit(gpio, msm_gpio.enabled_irqs);
- set_gpio_bits(INTR_RAW_STATUS_EN | INTR_ENABLE, GPIO_INTR_CFG(gpio));
- writel(TARGET_PROC_SCORPION, GPIO_INTR_CFG_SU(gpio));
- spin_unlock_irqrestore(&tlmm_lock, irq_flags);
-}
-
-static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int flow_type)
-{
- int gpio = msm_irq_to_gpio(&msm_gpio.gpio_chip, d->irq);
- unsigned long irq_flags;
- uint32_t bits;
-
- spin_lock_irqsave(&tlmm_lock, irq_flags);
-
- bits = readl(GPIO_INTR_CFG(gpio));
-
- if (flow_type & IRQ_TYPE_EDGE_BOTH) {
- bits |= BIT(INTR_DECT_CTL);
- __irq_set_handler_locked(d->irq, handle_edge_irq);
- if ((flow_type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH)
- __set_bit(gpio, msm_gpio.dual_edge_irqs);
- else
- __clear_bit(gpio, msm_gpio.dual_edge_irqs);
- } else {
- bits &= ~BIT(INTR_DECT_CTL);
- __irq_set_handler_locked(d->irq, handle_level_irq);
- __clear_bit(gpio, msm_gpio.dual_edge_irqs);
- }
-
- if (flow_type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_HIGH))
- bits |= BIT(INTR_POL_CTL);
- else
- bits &= ~BIT(INTR_POL_CTL);
-
- writel(bits, GPIO_INTR_CFG(gpio));
-
- if ((flow_type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH)
- msm_gpio_update_dual_edge_pos(gpio);
-
- spin_unlock_irqrestore(&tlmm_lock, irq_flags);
-
- return 0;
-}
-
-/*
- * When the summary IRQ is raised, any number of GPIO lines may be high.
- * It is the job of the summary handler to find all those GPIO lines
- * which have been set as summary IRQ lines and which are triggered,
- * and to call their interrupt handlers.
- */
-static void msm_summary_irq_handler(unsigned int irq, struct irq_desc *desc)
-{
- unsigned long i;
- struct irq_chip *chip = irq_desc_get_chip(desc);
-
- chained_irq_enter(chip, desc);
-
- for (i = find_first_bit(msm_gpio.enabled_irqs, NR_GPIO_IRQS);
- i < NR_GPIO_IRQS;
- i = find_next_bit(msm_gpio.enabled_irqs, NR_GPIO_IRQS, i + 1)) {
- if (readl(GPIO_INTR_STATUS(i)) & BIT(INTR_STATUS))
- generic_handle_irq(msm_gpio_to_irq(&msm_gpio.gpio_chip,
- i));
- }
-
- chained_irq_exit(chip, desc);
-}
-
-static int msm_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
-{
- int gpio = msm_irq_to_gpio(&msm_gpio.gpio_chip, d->irq);
-
- if (on) {
- if (bitmap_empty(msm_gpio.wake_irqs, NR_GPIO_IRQS))
- irq_set_irq_wake(TLMM_SCSS_SUMMARY_IRQ, 1);
- set_bit(gpio, msm_gpio.wake_irqs);
- } else {
- clear_bit(gpio, msm_gpio.wake_irqs);
- if (bitmap_empty(msm_gpio.wake_irqs, NR_GPIO_IRQS))
- irq_set_irq_wake(TLMM_SCSS_SUMMARY_IRQ, 0);
- }
-
- return 0;
-}
-
-static struct irq_chip msm_gpio_irq_chip = {
- .name = "msmgpio",
- .irq_mask = msm_gpio_irq_mask,
- .irq_unmask = msm_gpio_irq_unmask,
- .irq_ack = msm_gpio_irq_ack,
- .irq_set_type = msm_gpio_irq_set_type,
- .irq_set_wake = msm_gpio_irq_set_wake,
-};
-
-static int __devinit msm_gpio_probe(struct platform_device *dev)
-{
- int i, irq, ret;
-
- bitmap_zero(msm_gpio.enabled_irqs, NR_GPIO_IRQS);
- bitmap_zero(msm_gpio.wake_irqs, NR_GPIO_IRQS);
- bitmap_zero(msm_gpio.dual_edge_irqs, NR_GPIO_IRQS);
- msm_gpio.gpio_chip.label = dev->name;
- ret = gpiochip_add(&msm_gpio.gpio_chip);
- if (ret < 0)
- return ret;
-
- for (i = 0; i < msm_gpio.gpio_chip.ngpio; ++i) {
- irq = msm_gpio_to_irq(&msm_gpio.gpio_chip, i);
- irq_set_chip_and_handler(irq, &msm_gpio_irq_chip,
- handle_level_irq);
- set_irq_flags(irq, IRQF_VALID);
- }
-
- irq_set_chained_handler(TLMM_SCSS_SUMMARY_IRQ,
- msm_summary_irq_handler);
- return 0;
-}
-
-static int __devexit msm_gpio_remove(struct platform_device *dev)
-{
- int ret = gpiochip_remove(&msm_gpio.gpio_chip);
-
- if (ret < 0)
- return ret;
-
- irq_set_handler(TLMM_SCSS_SUMMARY_IRQ, NULL);
-
- return 0;
-}
-
-static struct platform_driver msm_gpio_driver = {
- .probe = msm_gpio_probe,
- .remove = __devexit_p(msm_gpio_remove),
- .driver = {
- .name = "msmgpio",
- .owner = THIS_MODULE,
- },
-};
-
-static struct platform_device msm_device_gpio = {
- .name = "msmgpio",
- .id = -1,
-};
-
-static int __init msm_gpio_init(void)
-{
- int rc;
-
- rc = platform_driver_register(&msm_gpio_driver);
- if (!rc) {
- rc = platform_device_register(&msm_device_gpio);
- if (rc)
- platform_driver_unregister(&msm_gpio_driver);
- }
-
- return rc;
-}
-
-static void __exit msm_gpio_exit(void)
-{
- platform_device_unregister(&msm_device_gpio);
- platform_driver_unregister(&msm_gpio_driver);
-}
-
-postcore_initcall(msm_gpio_init);
-module_exit(msm_gpio_exit);
-
-MODULE_AUTHOR("Gregory Bean <gbean@codeaurora.org>");
-MODULE_DESCRIPTION("Driver for Qualcomm MSM TLMMv2 SoC GPIOs");
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("platform:msmgpio");