diff options
Diffstat (limited to 'drivers/gpio/gpio-crystalcove.c')
| -rw-r--r-- | drivers/gpio/gpio-crystalcove.c | 410 |
1 files changed, 410 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-crystalcove.c b/drivers/gpio/gpio-crystalcove.c new file mode 100644 index 000000000..58531d8b8 --- /dev/null +++ b/drivers/gpio/gpio-crystalcove.c @@ -0,0 +1,410 @@ +/* + * 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/module.h> +#include <linux/platform_device.h> +#include <linux/gpio/driver.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 CRYSTALCOVE_VGPIO_NUM 95 + +#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 GPIOPANELCTL 0x52 + +#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 int to_reg(int gpio, enum ctrl_register reg_type) +{ + int reg; + + if (gpio >= CRYSTALCOVE_GPIO_NUM) { + /* + * Virtual GPIO called from ACPI, for now we only support + * the panel ctl. + */ + switch (gpio) { + case 0x5e: + return GPIOPANELCTL; + default: + return -EOPNOTSUPP; + } + } + + 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 = gpiochip_get_data(chip); + int reg = to_reg(gpio, CTRL_OUT); + + if (reg < 0) + return 0; + + return regmap_write(cg->regmap, reg, CTLO_INPUT_SET); +} + +static int crystalcove_gpio_dir_out(struct gpio_chip *chip, unsigned gpio, + int value) +{ + struct crystalcove_gpio *cg = gpiochip_get_data(chip); + int reg = to_reg(gpio, CTRL_OUT); + + if (reg < 0) + return 0; + + return regmap_write(cg->regmap, reg, CTLO_OUTPUT_SET | value); +} + +static int crystalcove_gpio_get(struct gpio_chip *chip, unsigned gpio) +{ + struct crystalcove_gpio *cg = gpiochip_get_data(chip); + unsigned int val; + int ret, reg = to_reg(gpio, CTRL_IN); + + if (reg < 0) + return 0; + + ret = regmap_read(cg->regmap, reg, &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 = gpiochip_get_data(chip); + int reg = to_reg(gpio, CTRL_OUT); + + if (reg < 0) + return; + + if (value) + regmap_update_bits(cg->regmap, reg, 1, 1); + else + regmap_update_bits(cg->regmap, reg, 1, 0); +} + +static int crystalcove_irq_type(struct irq_data *data, unsigned type) +{ + struct crystalcove_gpio *cg = + gpiochip_get_data(irq_data_get_irq_chip_data(data)); + + if (data->hwirq >= CRYSTALCOVE_GPIO_NUM) + return 0; + + 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 = + gpiochip_get_data(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 = + gpiochip_get_data(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 = + gpiochip_get_data(irq_data_get_irq_chip_data(data)); + + if (data->hwirq < CRYSTALCOVE_GPIO_NUM) { + cg->set_irq_mask = false; + cg->update |= UPDATE_IRQ_MASK; + } +} + +static void crystalcove_irq_mask(struct irq_data *data) +{ + struct crystalcove_gpio *cg = + gpiochip_get_data(irq_data_get_irq_chip_data(data)); + + if (data->hwirq < CRYSTALCOVE_GPIO_NUM) { + 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, + .flags = IRQCHIP_SKIP_SET_WAKE, +}; + +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 < CRYSTALCOVE_GPIO_NUM; gpio++) { + if (pending & BIT(gpio)) { + virq = irq_find_mapping(cg->chip.irq.domain, gpio); + handle_nested_irq(virq); + } + } + + return IRQ_HANDLED; +} + +static void crystalcove_gpio_dbg_show(struct seq_file *s, + struct gpio_chip *chip) +{ + struct crystalcove_gpio *cg = gpiochip_get_data(chip); + int gpio, offset; + unsigned int ctlo, ctli, mirqs0, mirqsx, irq; + + for (gpio = 0; gpio < CRYSTALCOVE_GPIO_NUM; 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_VGPIO_NUM; + cg->chip.can_sleep = true; + cg->chip.parent = dev; + cg->chip.dbg_show = crystalcove_gpio_dbg_show; + cg->regmap = pmic->regmap; + + retval = devm_gpiochip_add_data(&pdev->dev, &cg->chip, cg); + if (retval) { + dev_warn(&pdev->dev, "add gpio chip error: %d\n", retval); + return retval; + } + + gpiochip_irqchip_add_nested(&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); + return retval; + } + + gpiochip_set_nested_irqchip(&cg->chip, &crystalcove_irqchip, irq); + + return 0; +} + +static int crystalcove_gpio_remove(struct platform_device *pdev) +{ + struct crystalcove_gpio *cg = platform_get_drvdata(pdev); + int irq = platform_get_irq(pdev, 0); + + 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", + }, +}; + +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"); |