/* * 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.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");