/* * Intel Whiskey Cove PMIC GPIO Driver * * This driver is written based on gpio-crystalcove.c * * Copyright (C) 2016 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. */ #include #include #include #include #include #include #include #include /* * Whiskey Cove PMIC has 13 physical GPIO pins divided into 3 banks: * Bank 0: Pin 0 - 6 * Bank 1: Pin 7 - 10 * Bank 2: Pin 11 -12 * Each pin has one output control register and one input control register. */ #define BANK0_NR_PINS 7 #define BANK1_NR_PINS 4 #define BANK2_NR_PINS 2 #define WCOVE_GPIO_NUM (BANK0_NR_PINS + BANK1_NR_PINS + BANK2_NR_PINS) #define WCOVE_VGPIO_NUM 94 /* GPIO output control registers (one per pin): 0x4e44 - 0x4e50 */ #define GPIO_OUT_CTRL_BASE 0x4e44 /* GPIO input control registers (one per pin): 0x4e51 - 0x4e5d */ #define GPIO_IN_CTRL_BASE 0x4e51 /* * GPIO interrupts are organized in two groups: * Group 0: Bank 0 pins (Pin 0 - 6) * Group 1: Bank 1 and Bank 2 pins (Pin 7 - 12) * Each group has two registers (one bit per pin): status and mask. */ #define GROUP0_NR_IRQS 7 #define GROUP1_NR_IRQS 6 #define IRQ_MASK_BASE 0x4e19 #define IRQ_STATUS_BASE 0x4e0b #define GPIO_IRQ0_MASK GENMASK(6, 0) #define GPIO_IRQ1_MASK GENMASK(5, 0) #define UPDATE_IRQ_TYPE BIT(0) #define UPDATE_IRQ_MASK BIT(1) #define CTLI_INTCNT_DIS (0 << 1) #define CTLI_INTCNT_NE (1 << 1) #define CTLI_INTCNT_PE (2 << 1) #define CTLI_INTCNT_BE (3 << 1) #define CTLO_DIR_IN (0 << 5) #define CTLO_DIR_OUT (1 << 5) #define CTLO_DRV_MASK (1 << 4) #define CTLO_DRV_OD (0 << 4) #define CTLO_DRV_CMOS (1 << 4) #define CTLO_DRV_REN (1 << 3) #define CTLO_RVAL_2KDOWN (0 << 1) #define CTLO_RVAL_2KUP (1 << 1) #define CTLO_RVAL_50KDOWN (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 wcove_gpio - Whiskey Cove GPIO controller * @buslock: for bus lock/sync and unlock. * @chip: the abstract gpio_chip structure. * @dev: the gpio device * @regmap: the regmap from the parent device. * @regmap_irq_chip: the regmap of the gpio irq chip. * @update: pending IRQ setting update, to be written to the chip upon unlock. * @intcnt: the Interrupt Detect value to be written. * @set_irq_mask: true if the IRQ mask needs to be set, false to clear. */ struct wcove_gpio { struct mutex buslock; struct gpio_chip chip; struct device *dev; struct regmap *regmap; struct regmap_irq_chip_data *regmap_irq_chip; int update; int intcnt; bool set_irq_mask; }; static inline unsigned int to_reg(int gpio, enum ctrl_register reg_type) { unsigned int reg; if (gpio >= WCOVE_GPIO_NUM) return -EOPNOTSUPP; if (reg_type == CTRL_IN) reg = GPIO_IN_CTRL_BASE + gpio; else reg = GPIO_OUT_CTRL_BASE + gpio; return reg; } static void wcove_update_irq_mask(struct wcove_gpio *wg, int gpio) { unsigned int reg, mask; if (gpio < GROUP0_NR_IRQS) { reg = IRQ_MASK_BASE; mask = BIT(gpio % GROUP0_NR_IRQS); } else { reg = IRQ_MASK_BASE + 1; mask = BIT((gpio - GROUP0_NR_IRQS) % GROUP1_NR_IRQS); } if (wg->set_irq_mask) regmap_update_bits(wg->regmap, reg, mask, mask); else regmap_update_bits(wg->regmap, reg, mask, 0); } static void wcove_update_irq_ctrl(struct wcove_gpio *wg, int gpio) { int reg = to_reg(gpio, CTRL_IN); if (reg < 0) return; regmap_update_bits(wg->regmap, reg, CTLI_INTCNT_BE, wg->intcnt); } static int wcove_gpio_dir_in(struct gpio_chip *chip, unsigned int gpio) { struct wcove_gpio *wg = gpiochip_get_data(chip); int reg = to_reg(gpio, CTRL_OUT); if (reg < 0) return 0; return regmap_write(wg->regmap, reg, CTLO_INPUT_SET); } static int wcove_gpio_dir_out(struct gpio_chip *chip, unsigned int gpio, int value) { struct wcove_gpio *wg = gpiochip_get_data(chip); int reg = to_reg(gpio, CTRL_OUT); if (reg < 0) return 0; return regmap_write(wg->regmap, reg, CTLO_OUTPUT_SET | value); } static int wcove_gpio_get_direction(struct gpio_chip *chip, unsigned int gpio) { struct wcove_gpio *wg = gpiochip_get_data(chip); unsigned int val; int ret, reg = to_reg(gpio, CTRL_OUT); if (reg < 0) return 0; ret = regmap_read(wg->regmap, reg, &val); if (ret) return ret; return !(val & CTLO_DIR_OUT); } static int wcove_gpio_get(struct gpio_chip *chip, unsigned int gpio) { struct wcove_gpio *wg = gpiochip_get_data(chip); unsigned int val; int ret, reg = to_reg(gpio, CTRL_IN); if (reg < 0) return 0; ret = regmap_read(wg->regmap, reg, &val); if (ret) return ret; return val & 0x1; } static void wcove_gpio_set(struct gpio_chip *chip, unsigned int gpio, int value) { struct wcove_gpio *wg = gpiochip_get_data(chip); int reg = to_reg(gpio, CTRL_OUT); if (reg < 0) return; if (value) regmap_update_bits(wg->regmap, reg, 1, 1); else regmap_update_bits(wg->regmap, reg, 1, 0); } static int wcove_gpio_set_config(struct gpio_chip *chip, unsigned int gpio, unsigned long config) { struct wcove_gpio *wg = gpiochip_get_data(chip); int reg = to_reg(gpio, CTRL_OUT); if (reg < 0) return 0; switch (pinconf_to_config_param(config)) { case PIN_CONFIG_DRIVE_OPEN_DRAIN: return regmap_update_bits(wg->regmap, reg, CTLO_DRV_MASK, CTLO_DRV_OD); case PIN_CONFIG_DRIVE_PUSH_PULL: return regmap_update_bits(wg->regmap, reg, CTLO_DRV_MASK, CTLO_DRV_CMOS); default: break; } return -ENOTSUPP; } static int wcove_irq_type(struct irq_data *data, unsigned int type) { struct gpio_chip *chip = irq_data_get_irq_chip_data(data); struct wcove_gpio *wg = gpiochip_get_data(chip); if (data->hwirq >= WCOVE_GPIO_NUM) return 0; switch (type) { case IRQ_TYPE_NONE: wg->intcnt = CTLI_INTCNT_DIS; break; case IRQ_TYPE_EDGE_BOTH: wg->intcnt = CTLI_INTCNT_BE; break; case IRQ_TYPE_EDGE_RISING: wg->intcnt = CTLI_INTCNT_PE; break; case IRQ_TYPE_EDGE_FALLING: wg->intcnt = CTLI_INTCNT_NE; break; default: return -EINVAL; } wg->update |= UPDATE_IRQ_TYPE; return 0; } static void wcove_bus_lock(struct irq_data *data) { struct gpio_chip *chip = irq_data_get_irq_chip_data(data); struct wcove_gpio *wg = gpiochip_get_data(chip); mutex_lock(&wg->buslock); } static void wcove_bus_sync_unlock(struct irq_data *data) { struct gpio_chip *chip = irq_data_get_irq_chip_data(data); struct wcove_gpio *wg = gpiochip_get_data(chip); int gpio = data->hwirq; if (wg->update & UPDATE_IRQ_TYPE) wcove_update_irq_ctrl(wg, gpio); if (wg->update & UPDATE_IRQ_MASK) wcove_update_irq_mask(wg, gpio); wg->update = 0; mutex_unlock(&wg->buslock); } static void wcove_irq_unmask(struct irq_data *data) { struct gpio_chip *chip = irq_data_get_irq_chip_data(data); struct wcove_gpio *wg = gpiochip_get_data(chip); if (data->hwirq >= WCOVE_GPIO_NUM) return; wg->set_irq_mask = false; wg->update |= UPDATE_IRQ_MASK; } static void wcove_irq_mask(struct irq_data *data) { struct gpio_chip *chip = irq_data_get_irq_chip_data(data); struct wcove_gpio *wg = gpiochip_get_data(chip); if (data->hwirq >= WCOVE_GPIO_NUM) return; wg->set_irq_mask = true; wg->update |= UPDATE_IRQ_MASK; } static struct irq_chip wcove_irqchip = { .name = "Whiskey Cove", .irq_mask = wcove_irq_mask, .irq_unmask = wcove_irq_unmask, .irq_set_type = wcove_irq_type, .irq_bus_lock = wcove_bus_lock, .irq_bus_sync_unlock = wcove_bus_sync_unlock, }; static irqreturn_t wcove_gpio_irq_handler(int irq, void *data) { struct wcove_gpio *wg = (struct wcove_gpio *)data; unsigned int pending, virq, gpio, mask, offset; u8 p[2]; if (regmap_bulk_read(wg->regmap, IRQ_STATUS_BASE, p, 2)) { dev_err(wg->dev, "Failed to read irq status register\n"); return IRQ_NONE; } pending = (p[0] & GPIO_IRQ0_MASK) | ((p[1] & GPIO_IRQ1_MASK) << 7); if (!pending) return IRQ_NONE; /* Iterate until no interrupt is pending */ while (pending) { /* One iteration is for all pending bits */ for_each_set_bit(gpio, (const unsigned long *)&pending, WCOVE_GPIO_NUM) { offset = (gpio > GROUP0_NR_IRQS) ? 1 : 0; mask = (offset == 1) ? BIT(gpio - GROUP0_NR_IRQS) : BIT(gpio); virq = irq_find_mapping(wg->chip.irq.domain, gpio); handle_nested_irq(virq); regmap_update_bits(wg->regmap, IRQ_STATUS_BASE + offset, mask, mask); } /* Next iteration */ if (regmap_bulk_read(wg->regmap, IRQ_STATUS_BASE, p, 2)) { dev_err(wg->dev, "Failed to read irq status\n"); break; } pending = (p[0] & GPIO_IRQ0_MASK) | ((p[1] & GPIO_IRQ1_MASK) << 7); } return IRQ_HANDLED; } static void wcove_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) { unsigned int ctlo, ctli, irq_mask, irq_status; struct wcove_gpio *wg = gpiochip_get_data(chip); int gpio, offset, group, ret = 0; for (gpio = 0; gpio < WCOVE_GPIO_NUM; gpio++) { group = gpio < GROUP0_NR_IRQS ? 0 : 1; ret += regmap_read(wg->regmap, to_reg(gpio, CTRL_OUT), &ctlo); ret += regmap_read(wg->regmap, to_reg(gpio, CTRL_IN), &ctli); ret += regmap_read(wg->regmap, IRQ_MASK_BASE + group, &irq_mask); ret += regmap_read(wg->regmap, IRQ_STATUS_BASE + group, &irq_status); if (ret) { pr_err("Failed to read registers: ctrl out/in or irq status/mask\n"); break; } offset = gpio % 8; seq_printf(s, " gpio-%-2d %s %s %s %s ctlo=%2x,%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, irq_mask & BIT(offset) ? "mask " : "unmask", irq_status & BIT(offset) ? "pending" : " "); } } static int wcove_gpio_probe(struct platform_device *pdev) { struct intel_soc_pmic *pmic; struct wcove_gpio *wg; int virq, ret, irq; struct device *dev; /* * This gpio platform device is created by a mfd device (see * drivers/mfd/intel_soc_pmic_bxtwc.c for details). Information * shared by all sub-devices created by the mfd device, the regmap * pointer for instance, is stored as driver data of the mfd device * driver. */ pmic = dev_get_drvdata(pdev->dev.parent); if (!pmic) return -ENODEV; irq = platform_get_irq(pdev, 0); if (irq < 0) return irq; dev = &pdev->dev; wg = devm_kzalloc(dev, sizeof(*wg), GFP_KERNEL); if (!wg) return -ENOMEM; wg->regmap_irq_chip = pmic->irq_chip_data; platform_set_drvdata(pdev, wg); mutex_init(&wg->buslock); wg->chip.label = KBUILD_MODNAME; wg->chip.direction_input = wcove_gpio_dir_in; wg->chip.direction_output = wcove_gpio_dir_out; wg->chip.get_direction = wcove_gpio_get_direction; wg->chip.get = wcove_gpio_get; wg->chip.set = wcove_gpio_set; wg->chip.set_config = wcove_gpio_set_config, wg->chip.base = -1; wg->chip.ngpio = WCOVE_VGPIO_NUM; wg->chip.can_sleep = true; wg->chip.parent = pdev->dev.parent; wg->chip.dbg_show = wcove_gpio_dbg_show; wg->dev = dev; wg->regmap = pmic->regmap; ret = devm_gpiochip_add_data(dev, &wg->chip, wg); if (ret) { dev_err(dev, "Failed to add gpiochip: %d\n", ret); return ret; } ret = gpiochip_irqchip_add_nested(&wg->chip, &wcove_irqchip, 0, handle_simple_irq, IRQ_TYPE_NONE); if (ret) { dev_err(dev, "Failed to add irqchip: %d\n", ret); return ret; } virq = regmap_irq_get_virq(wg->regmap_irq_chip, irq); if (virq < 0) { dev_err(dev, "Failed to get virq by irq %d\n", irq); return virq; } ret = devm_request_threaded_irq(dev, virq, NULL, wcove_gpio_irq_handler, IRQF_ONESHOT, pdev->name, wg); if (ret) { dev_err(dev, "Failed to request irq %d\n", virq); return ret; } gpiochip_set_nested_irqchip(&wg->chip, &wcove_irqchip, virq); /* Enable GPIO0 interrupts */ ret = regmap_update_bits(wg->regmap, IRQ_MASK_BASE, GPIO_IRQ0_MASK, 0x00); if (ret) return ret; /* Enable GPIO1 interrupts */ ret = regmap_update_bits(wg->regmap, IRQ_MASK_BASE + 1, GPIO_IRQ1_MASK, 0x00); if (ret) return ret; return 0; } /* * Whiskey Cove PMIC itself is a analog device(but with digital control * interface) providing power management support for other devices in * the accompanied SoC, so we have no .pm for Whiskey Cove GPIO driver. */ static struct platform_driver wcove_gpio_driver = { .driver = { .name = "bxt_wcove_gpio", }, .probe = wcove_gpio_probe, }; module_platform_driver(wcove_gpio_driver); MODULE_AUTHOR("Ajay Thomas "); MODULE_AUTHOR("Bin Gao "); MODULE_DESCRIPTION("Intel Whiskey Cove GPIO Driver"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:bxt_wcove_gpio");