diff options
Diffstat (limited to 'kernel/drivers/gpio/gpio-msm-v2.c')
| -rw-r--r-- | kernel/drivers/gpio/gpio-msm-v2.c | 462 |
1 files changed, 0 insertions, 462 deletions
diff --git a/kernel/drivers/gpio/gpio-msm-v2.c b/kernel/drivers/gpio/gpio-msm-v2.c deleted file mode 100644 index 52ff18229..000000000 --- a/kernel/drivers/gpio/gpio-msm-v2.c +++ /dev/null @@ -1,462 +0,0 @@ -/* Copyright (c) 2010-2011, 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/err.h> -#include <linux/gpio.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/io.h> -#include <linux/irqchip/chained_irq.h> -#include <linux/irq.h> -#include <linux/irqdomain.h> -#include <linux/module.h> -#include <linux/of_address.h> -#include <linux/platform_device.h> -#include <linux/spinlock.h> -#include <linux/slab.h> - -#define MAX_NR_GPIO 300 - -/* 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, -}; - -/** - * 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, MAX_NR_GPIO); - DECLARE_BITMAP(wake_irqs, MAX_NR_GPIO); - DECLARE_BITMAP(dual_edge_irqs, MAX_NR_GPIO); - struct irq_domain *domain; - int summary_irq; - void __iomem *msm_tlmm_base; -}; - -static struct msm_gpio_dev msm_gpio; - -#define GPIO_INTR_CFG_SU(gpio) (msm_gpio.msm_tlmm_base + 0x0400 + \ - (0x04 * (gpio))) -#define GPIO_CONFIG(gpio) (msm_gpio.msm_tlmm_base + 0x1000 + \ - (0x10 * (gpio))) -#define GPIO_IN_OUT(gpio) (msm_gpio.msm_tlmm_base + 0x1004 + \ - (0x10 * (gpio))) -#define GPIO_INTR_CFG(gpio) (msm_gpio.msm_tlmm_base + 0x1008 + \ - (0x10 * (gpio))) -#define GPIO_INTR_STATUS(gpio) (msm_gpio.msm_tlmm_base + 0x100c + \ - (0x10 * (gpio))) - -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 0; -} - -static void msm_gpio_free(struct gpio_chip *chip, unsigned offset) -{ - return; -} - -static int msm_gpio_to_irq(struct gpio_chip *chip, unsigned offset) -{ - struct msm_gpio_dev *g_dev = to_msm_gpio_dev(chip); - struct irq_domain *domain = g_dev->domain; - - return irq_create_mapping(domain, offset); -} - -static inline int msm_irq_to_gpio(struct gpio_chip *chip, unsigned irq) -{ - struct irq_data *irq_data = irq_get_irq_data(irq); - - return irq_data->hwirq; -} - - -/* 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("%s: dual-edge irq failed to stabilize, " - "interrupts dropped. %#08x != %#08x\n", - __func__, 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(BIT(INTR_RAW_STATUS_EN) | BIT(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(BIT(INTR_RAW_STATUS_EN) | BIT(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_each_set_bit(i, msm_gpio.enabled_irqs, MAX_NR_GPIO) { - if (readl(GPIO_INTR_STATUS(i)) & BIT(INTR_STATUS)) - generic_handle_irq(irq_find_mapping(msm_gpio.domain, - 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, MAX_NR_GPIO)) - irq_set_irq_wake(msm_gpio.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, MAX_NR_GPIO)) - irq_set_irq_wake(msm_gpio.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 struct lock_class_key msm_gpio_lock_class; - -static int msm_gpio_irq_domain_map(struct irq_domain *d, unsigned int irq, - irq_hw_number_t hwirq) -{ - irq_set_lockdep_class(irq, &msm_gpio_lock_class); - irq_set_chip_and_handler(irq, &msm_gpio_irq_chip, - handle_level_irq); - set_irq_flags(irq, IRQF_VALID); - - return 0; -} - -static const struct irq_domain_ops msm_gpio_irq_domain_ops = { - .xlate = irq_domain_xlate_twocell, - .map = msm_gpio_irq_domain_map, -}; - -static int msm_gpio_probe(struct platform_device *pdev) -{ - int ret, ngpio; - struct resource *res; - - if (of_property_read_u32(pdev->dev.of_node, "ngpio", &ngpio)) { - dev_err(&pdev->dev, "%s: ngpio property missing\n", __func__); - return -EINVAL; - } - - if (ngpio > MAX_NR_GPIO) - WARN(1, "ngpio exceeds the MAX_NR_GPIO. Increase MAX_NR_GPIO\n"); - - bitmap_zero(msm_gpio.enabled_irqs, MAX_NR_GPIO); - bitmap_zero(msm_gpio.wake_irqs, MAX_NR_GPIO); - bitmap_zero(msm_gpio.dual_edge_irqs, MAX_NR_GPIO); - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - msm_gpio.msm_tlmm_base = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(msm_gpio.msm_tlmm_base)) - return PTR_ERR(msm_gpio.msm_tlmm_base); - - msm_gpio.gpio_chip.ngpio = ngpio; - msm_gpio.gpio_chip.label = pdev->name; - msm_gpio.gpio_chip.dev = &pdev->dev; - msm_gpio.gpio_chip.base = 0; - msm_gpio.gpio_chip.direction_input = msm_gpio_direction_input; - msm_gpio.gpio_chip.direction_output = msm_gpio_direction_output; - msm_gpio.gpio_chip.get = msm_gpio_get; - msm_gpio.gpio_chip.set = msm_gpio_set; - msm_gpio.gpio_chip.to_irq = msm_gpio_to_irq; - msm_gpio.gpio_chip.request = msm_gpio_request; - msm_gpio.gpio_chip.free = msm_gpio_free; - - ret = gpiochip_add(&msm_gpio.gpio_chip); - if (ret < 0) { - dev_err(&pdev->dev, "gpiochip_add failed with error %d\n", ret); - return ret; - } - - msm_gpio.summary_irq = platform_get_irq(pdev, 0); - if (msm_gpio.summary_irq < 0) { - dev_err(&pdev->dev, "No Summary irq defined for msmgpio\n"); - return msm_gpio.summary_irq; - } - - msm_gpio.domain = irq_domain_add_linear(pdev->dev.of_node, ngpio, - &msm_gpio_irq_domain_ops, - &msm_gpio); - if (!msm_gpio.domain) - return -ENODEV; - - irq_set_chained_handler(msm_gpio.summary_irq, msm_summary_irq_handler); - - return 0; -} - -static const struct of_device_id msm_gpio_of_match[] = { - { .compatible = "qcom,msm-gpio", }, - { }, -}; -MODULE_DEVICE_TABLE(of, msm_gpio_of_match); - -static int msm_gpio_remove(struct platform_device *dev) -{ - gpiochip_remove(&msm_gpio.gpio_chip); - - irq_set_handler(msm_gpio.summary_irq, NULL); - - return 0; -} - -static struct platform_driver msm_gpio_driver = { - .probe = msm_gpio_probe, - .remove = msm_gpio_remove, - .driver = { - .name = "msmgpio", - .of_match_table = msm_gpio_of_match, - }, -}; - -module_platform_driver(msm_gpio_driver) - -MODULE_AUTHOR("Gregory Bean <gbean@codeaurora.org>"); -MODULE_DESCRIPTION("Driver for Qualcomm MSM TLMMv2 SoC GPIOs"); -MODULE_LICENSE("GPL v2"); -MODULE_ALIAS("platform:msmgpio"); |