| /* |
| * gpio-crystalcove.c - Intel Crystal Cove GPIO Driver |
| * |
| * Copyright (C) 2012, 2014 Intel Corporation. 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 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. |
| * |
| * Author: Yang, Bin <bin.yang@intel.com> |
| */ |
| |
| #include <linux/interrupt.h> |
| #include <linux/platform_device.h> |
| #include <linux/gpio.h> |
| #include <linux/seq_file.h> |
| #include <linux/bitops.h> |
| #include <linux/regmap.h> |
| #include <linux/mfd/intel_soc_pmic.h> |
| |
| #define CRYSTALCOVE_GPIO_NUM 16 |
| |
| #define UPDATE_IRQ_TYPE BIT(0) |
| #define UPDATE_IRQ_MASK BIT(1) |
| |
| #define GPIO0IRQ 0x0b |
| #define GPIO1IRQ 0x0c |
| #define MGPIO0IRQS0 0x19 |
| #define MGPIO1IRQS0 0x1a |
| #define MGPIO0IRQSX 0x1b |
| #define MGPIO1IRQSX 0x1c |
| #define GPIO0P0CTLO 0x2b |
| #define GPIO0P0CTLI 0x33 |
| #define GPIO1P0CTLO 0x3b |
| #define GPIO1P0CTLI 0x43 |
| |
| #define CTLI_INTCNT_DIS (0) |
| #define CTLI_INTCNT_NE (1 << 1) |
| #define CTLI_INTCNT_PE (2 << 1) |
| #define CTLI_INTCNT_BE (3 << 1) |
| |
| #define CTLO_DIR_IN (0) |
| #define CTLO_DIR_OUT (1 << 5) |
| |
| #define CTLO_DRV_CMOS (0) |
| #define CTLO_DRV_OD (1 << 4) |
| |
| #define CTLO_DRV_REN (1 << 3) |
| |
| #define CTLO_RVAL_2KDW (0) |
| #define CTLO_RVAL_2KUP (1 << 1) |
| #define CTLO_RVAL_50KDW (2 << 1) |
| #define CTLO_RVAL_50KUP (3 << 1) |
| |
| #define CTLO_INPUT_SET (CTLO_DRV_CMOS | CTLO_DRV_REN | CTLO_RVAL_2KUP) |
| #define CTLO_OUTPUT_SET (CTLO_DIR_OUT | CTLO_INPUT_SET) |
| |
| enum ctrl_register { |
| CTRL_IN, |
| CTRL_OUT, |
| }; |
| |
| /** |
| * struct crystalcove_gpio - Crystal Cove GPIO controller |
| * @buslock: for bus lock/sync and unlock. |
| * @chip: the abstract gpio_chip structure. |
| * @regmap: the regmap from the parent device. |
| * @update: pending IRQ setting update, to be written to the chip upon unlock. |
| * @intcnt_value: the Interrupt Detect value to be written. |
| * @set_irq_mask: true if the IRQ mask needs to be set, false to clear. |
| */ |
| struct crystalcove_gpio { |
| struct mutex buslock; /* irq_bus_lock */ |
| struct gpio_chip chip; |
| struct regmap *regmap; |
| int update; |
| int intcnt_value; |
| bool set_irq_mask; |
| }; |
| |
| static inline struct crystalcove_gpio *to_cg(struct gpio_chip *gc) |
| { |
| return container_of(gc, struct crystalcove_gpio, chip); |
| } |
| |
| static inline int to_reg(int gpio, enum ctrl_register reg_type) |
| { |
| int reg; |
| |
| if (reg_type == CTRL_IN) { |
| if (gpio < 8) |
| reg = GPIO0P0CTLI; |
| else |
| reg = GPIO1P0CTLI; |
| } else { |
| if (gpio < 8) |
| reg = GPIO0P0CTLO; |
| else |
| reg = GPIO1P0CTLO; |
| } |
| |
| return reg + gpio % 8; |
| } |
| |
| static void crystalcove_update_irq_mask(struct crystalcove_gpio *cg, |
| int gpio) |
| { |
| u8 mirqs0 = gpio < 8 ? MGPIO0IRQS0 : MGPIO1IRQS0; |
| int mask = BIT(gpio % 8); |
| |
| if (cg->set_irq_mask) |
| regmap_update_bits(cg->regmap, mirqs0, mask, mask); |
| else |
| regmap_update_bits(cg->regmap, mirqs0, mask, 0); |
| } |
| |
| static void crystalcove_update_irq_ctrl(struct crystalcove_gpio *cg, int gpio) |
| { |
| int reg = to_reg(gpio, CTRL_IN); |
| |
| regmap_update_bits(cg->regmap, reg, CTLI_INTCNT_BE, cg->intcnt_value); |
| } |
| |
| static int crystalcove_gpio_dir_in(struct gpio_chip *chip, unsigned gpio) |
| { |
| struct crystalcove_gpio *cg = to_cg(chip); |
| |
| return regmap_write(cg->regmap, to_reg(gpio, CTRL_OUT), |
| CTLO_INPUT_SET); |
| } |
| |
| static int crystalcove_gpio_dir_out(struct gpio_chip *chip, unsigned gpio, |
| int value) |
| { |
| struct crystalcove_gpio *cg = to_cg(chip); |
| |
| return regmap_write(cg->regmap, to_reg(gpio, CTRL_OUT), |
| CTLO_OUTPUT_SET | value); |
| } |
| |
| static int crystalcove_gpio_get(struct gpio_chip *chip, unsigned gpio) |
| { |
| struct crystalcove_gpio *cg = to_cg(chip); |
| int ret; |
| unsigned int val; |
| |
| ret = regmap_read(cg->regmap, to_reg(gpio, CTRL_IN), &val); |
| if (ret) |
| return ret; |
| |
| return val & 0x1; |
| } |
| |
| static void crystalcove_gpio_set(struct gpio_chip *chip, |
| unsigned gpio, int value) |
| { |
| struct crystalcove_gpio *cg = to_cg(chip); |
| |
| if (value) |
| regmap_update_bits(cg->regmap, to_reg(gpio, CTRL_OUT), 1, 1); |
| else |
| regmap_update_bits(cg->regmap, to_reg(gpio, CTRL_OUT), 1, 0); |
| } |
| |
| static int crystalcove_irq_type(struct irq_data *data, unsigned type) |
| { |
| struct crystalcove_gpio *cg = to_cg(irq_data_get_irq_chip_data(data)); |
| |
| switch (type) { |
| case IRQ_TYPE_NONE: |
| cg->intcnt_value = CTLI_INTCNT_DIS; |
| break; |
| case IRQ_TYPE_EDGE_BOTH: |
| cg->intcnt_value = CTLI_INTCNT_BE; |
| break; |
| case IRQ_TYPE_EDGE_RISING: |
| cg->intcnt_value = CTLI_INTCNT_PE; |
| break; |
| case IRQ_TYPE_EDGE_FALLING: |
| cg->intcnt_value = CTLI_INTCNT_NE; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| cg->update |= UPDATE_IRQ_TYPE; |
| |
| return 0; |
| } |
| |
| static void crystalcove_bus_lock(struct irq_data *data) |
| { |
| struct crystalcove_gpio *cg = to_cg(irq_data_get_irq_chip_data(data)); |
| |
| mutex_lock(&cg->buslock); |
| } |
| |
| static void crystalcove_bus_sync_unlock(struct irq_data *data) |
| { |
| struct crystalcove_gpio *cg = to_cg(irq_data_get_irq_chip_data(data)); |
| int gpio = data->hwirq; |
| |
| if (cg->update & UPDATE_IRQ_TYPE) |
| crystalcove_update_irq_ctrl(cg, gpio); |
| if (cg->update & UPDATE_IRQ_MASK) |
| crystalcove_update_irq_mask(cg, gpio); |
| cg->update = 0; |
| |
| mutex_unlock(&cg->buslock); |
| } |
| |
| static void crystalcove_irq_unmask(struct irq_data *data) |
| { |
| struct crystalcove_gpio *cg = to_cg(irq_data_get_irq_chip_data(data)); |
| |
| cg->set_irq_mask = false; |
| cg->update |= UPDATE_IRQ_MASK; |
| } |
| |
| static void crystalcove_irq_mask(struct irq_data *data) |
| { |
| struct crystalcove_gpio *cg = to_cg(irq_data_get_irq_chip_data(data)); |
| |
| cg->set_irq_mask = true; |
| cg->update |= UPDATE_IRQ_MASK; |
| } |
| |
| static struct irq_chip crystalcove_irqchip = { |
| .name = "Crystal Cove", |
| .irq_mask = crystalcove_irq_mask, |
| .irq_unmask = crystalcove_irq_unmask, |
| .irq_set_type = crystalcove_irq_type, |
| .irq_bus_lock = crystalcove_bus_lock, |
| .irq_bus_sync_unlock = crystalcove_bus_sync_unlock, |
| }; |
| |
| static irqreturn_t crystalcove_gpio_irq_handler(int irq, void *data) |
| { |
| struct crystalcove_gpio *cg = data; |
| unsigned int p0, p1; |
| int pending; |
| int gpio; |
| unsigned int virq; |
| |
| if (regmap_read(cg->regmap, GPIO0IRQ, &p0) || |
| regmap_read(cg->regmap, GPIO1IRQ, &p1)) |
| return IRQ_NONE; |
| |
| regmap_write(cg->regmap, GPIO0IRQ, p0); |
| regmap_write(cg->regmap, GPIO1IRQ, p1); |
| |
| pending = p0 | p1 << 8; |
| |
| for (gpio = 0; gpio < cg->chip.ngpio; gpio++) { |
| if (pending & BIT(gpio)) { |
| virq = irq_find_mapping(cg->chip.irqdomain, gpio); |
| generic_handle_irq(virq); |
| } |
| } |
| |
| return IRQ_HANDLED; |
| } |
| |
| static void crystalcove_gpio_dbg_show(struct seq_file *s, |
| struct gpio_chip *chip) |
| { |
| struct crystalcove_gpio *cg = to_cg(chip); |
| int gpio, offset; |
| unsigned int ctlo, ctli, mirqs0, mirqsx, irq; |
| |
| for (gpio = 0; gpio < cg->chip.ngpio; gpio++) { |
| regmap_read(cg->regmap, to_reg(gpio, CTRL_OUT), &ctlo); |
| regmap_read(cg->regmap, to_reg(gpio, CTRL_IN), &ctli); |
| regmap_read(cg->regmap, gpio < 8 ? MGPIO0IRQS0 : MGPIO1IRQS0, |
| &mirqs0); |
| regmap_read(cg->regmap, gpio < 8 ? MGPIO0IRQSX : MGPIO1IRQSX, |
| &mirqsx); |
| regmap_read(cg->regmap, gpio < 8 ? GPIO0IRQ : GPIO1IRQ, |
| &irq); |
| |
| offset = gpio % 8; |
| seq_printf(s, " gpio-%-2d %s %s %s %s ctlo=%2x,%s %s %s\n", |
| gpio, ctlo & CTLO_DIR_OUT ? "out" : "in ", |
| ctli & 0x1 ? "hi" : "lo", |
| ctli & CTLI_INTCNT_NE ? "fall" : " ", |
| ctli & CTLI_INTCNT_PE ? "rise" : " ", |
| ctlo, |
| mirqs0 & BIT(offset) ? "s0 mask " : "s0 unmask", |
| mirqsx & BIT(offset) ? "sx mask " : "sx unmask", |
| irq & BIT(offset) ? "pending" : " "); |
| } |
| } |
| |
| static int crystalcove_gpio_probe(struct platform_device *pdev) |
| { |
| int irq = platform_get_irq(pdev, 0); |
| struct crystalcove_gpio *cg; |
| int retval; |
| struct device *dev = pdev->dev.parent; |
| struct intel_soc_pmic *pmic = dev_get_drvdata(dev); |
| |
| if (irq < 0) |
| return irq; |
| |
| cg = devm_kzalloc(&pdev->dev, sizeof(*cg), GFP_KERNEL); |
| if (!cg) |
| return -ENOMEM; |
| |
| platform_set_drvdata(pdev, cg); |
| |
| mutex_init(&cg->buslock); |
| cg->chip.label = KBUILD_MODNAME; |
| cg->chip.direction_input = crystalcove_gpio_dir_in; |
| cg->chip.direction_output = crystalcove_gpio_dir_out; |
| cg->chip.get = crystalcove_gpio_get; |
| cg->chip.set = crystalcove_gpio_set; |
| cg->chip.base = -1; |
| cg->chip.ngpio = CRYSTALCOVE_GPIO_NUM; |
| cg->chip.can_sleep = true; |
| cg->chip.dev = dev; |
| cg->chip.dbg_show = crystalcove_gpio_dbg_show; |
| cg->regmap = pmic->regmap; |
| |
| retval = gpiochip_add(&cg->chip); |
| if (retval) { |
| dev_warn(&pdev->dev, "add gpio chip error: %d\n", retval); |
| return retval; |
| } |
| |
| gpiochip_irqchip_add(&cg->chip, &crystalcove_irqchip, 0, |
| handle_simple_irq, IRQ_TYPE_NONE); |
| |
| retval = request_threaded_irq(irq, NULL, crystalcove_gpio_irq_handler, |
| IRQF_ONESHOT, KBUILD_MODNAME, cg); |
| |
| if (retval) { |
| dev_warn(&pdev->dev, "request irq failed: %d\n", retval); |
| goto out_remove_gpio; |
| } |
| |
| return 0; |
| |
| out_remove_gpio: |
| gpiochip_remove(&cg->chip); |
| return retval; |
| } |
| |
| static int crystalcove_gpio_remove(struct platform_device *pdev) |
| { |
| struct crystalcove_gpio *cg = platform_get_drvdata(pdev); |
| int irq = platform_get_irq(pdev, 0); |
| |
| gpiochip_remove(&cg->chip); |
| if (irq >= 0) |
| free_irq(irq, cg); |
| return 0; |
| } |
| |
| static struct platform_driver crystalcove_gpio_driver = { |
| .probe = crystalcove_gpio_probe, |
| .remove = crystalcove_gpio_remove, |
| .driver = { |
| .name = "crystal_cove_gpio", |
| .owner = THIS_MODULE, |
| }, |
| }; |
| |
| module_platform_driver(crystalcove_gpio_driver); |
| |
| MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>"); |
| MODULE_DESCRIPTION("Intel Crystal Cove GPIO Driver"); |
| MODULE_LICENSE("GPL v2"); |