--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Spreadtrum Communications Inc.
+ * Copyright (C) 2018 Linaro Ltd.
+ */
+
+#include <linux/gpio/driver.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+/* EIC registers definition */
+#define SPRD_PMIC_EIC_DATA 0x0
+#define SPRD_PMIC_EIC_DMSK 0x4
+#define SPRD_PMIC_EIC_IEV 0x14
+#define SPRD_PMIC_EIC_IE 0x18
+#define SPRD_PMIC_EIC_RIS 0x1c
+#define SPRD_PMIC_EIC_MIS 0x20
+#define SPRD_PMIC_EIC_IC 0x24
+#define SPRD_PMIC_EIC_TRIG 0x28
+#define SPRD_PMIC_EIC_CTRL0 0x40
+
+/*
+ * The PMIC EIC controller only has one bank, and each bank now can contain
+ * 16 EICs.
+ */
+#define SPRD_PMIC_EIC_PER_BANK_NR 16
+#define SPRD_PMIC_EIC_NR SPRD_PMIC_EIC_PER_BANK_NR
+#define SPRD_PMIC_EIC_DATA_MASK GENMASK(15, 0)
+#define SPRD_PMIC_EIC_BIT(x) ((x) & (SPRD_PMIC_EIC_PER_BANK_NR - 1))
+#define SPRD_PMIC_EIC_DBNC_MASK GENMASK(11, 0)
+
+/*
+ * These registers are modified under the irq bus lock and cached to avoid
+ * unnecessary writes in bus_sync_unlock.
+ */
+enum {
+ REG_IEV,
+ REG_IE,
+ REG_TRIG,
+ CACHE_NR_REGS
+};
+
+/**
+ * struct sprd_pmic_eic - PMIC EIC controller
+ * @chip: the gpio_chip structure.
+ * @intc: the irq_chip structure.
+ * @regmap: the regmap from the parent device.
+ * @offset: the EIC controller's offset address of the PMIC.
+ * @reg: the array to cache the EIC registers.
+ * @buslock: for bus lock/sync and unlock.
+ * @irq: the interrupt number of the PMIC EIC conteroller.
+ */
+struct sprd_pmic_eic {
+ struct gpio_chip chip;
+ struct irq_chip intc;
+ struct regmap *map;
+ u32 offset;
+ u8 reg[CACHE_NR_REGS];
+ struct mutex buslock;
+ int irq;
+};
+
+static void sprd_pmic_eic_update(struct gpio_chip *chip, unsigned int offset,
+ u16 reg, unsigned int val)
+{
+ struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
+ u32 shift = SPRD_PMIC_EIC_BIT(offset);
+
+ regmap_update_bits(pmic_eic->map, pmic_eic->offset + reg,
+ BIT(shift), val << shift);
+}
+
+static int sprd_pmic_eic_read(struct gpio_chip *chip, unsigned int offset,
+ u16 reg)
+{
+ struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
+ u32 value;
+ int ret;
+
+ ret = regmap_read(pmic_eic->map, pmic_eic->offset + reg, &value);
+ if (ret)
+ return ret;
+
+ return !!(value & BIT(SPRD_PMIC_EIC_BIT(offset)));
+}
+
+static int sprd_pmic_eic_request(struct gpio_chip *chip, unsigned int offset)
+{
+ sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_DMSK, 1);
+ return 0;
+}
+
+static void sprd_pmic_eic_free(struct gpio_chip *chip, unsigned int offset)
+{
+ sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_DMSK, 0);
+}
+
+static int sprd_pmic_eic_get(struct gpio_chip *chip, unsigned int offset)
+{
+ return sprd_pmic_eic_read(chip, offset, SPRD_PMIC_EIC_DATA);
+}
+
+static int sprd_pmic_eic_direction_input(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ /* EICs are always input, nothing need to do here. */
+ return 0;
+}
+
+static void sprd_pmic_eic_set(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ /* EICs are always input, nothing need to do here. */
+}
+
+static int sprd_pmic_eic_set_debounce(struct gpio_chip *chip,
+ unsigned int offset,
+ unsigned int debounce)
+{
+ struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
+ u32 reg, value;
+ int ret;
+
+ reg = SPRD_PMIC_EIC_CTRL0 + SPRD_PMIC_EIC_BIT(offset) * 0x4;
+ ret = regmap_read(pmic_eic->map, pmic_eic->offset + reg, &value);
+ if (ret)
+ return ret;
+
+ value &= ~SPRD_PMIC_EIC_DBNC_MASK;
+ value |= (debounce / 1000) & SPRD_PMIC_EIC_DBNC_MASK;
+ return regmap_write(pmic_eic->map, pmic_eic->offset + reg, value);
+}
+
+static int sprd_pmic_eic_set_config(struct gpio_chip *chip, unsigned int offset,
+ unsigned long config)
+{
+ unsigned long param = pinconf_to_config_param(config);
+ u32 arg = pinconf_to_config_argument(config);
+
+ if (param == PIN_CONFIG_INPUT_DEBOUNCE)
+ return sprd_pmic_eic_set_debounce(chip, offset, arg);
+
+ return -ENOTSUPP;
+}
+
+static void sprd_pmic_eic_irq_mask(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
+
+ pmic_eic->reg[REG_IE] = 0;
+ pmic_eic->reg[REG_TRIG] = 0;
+}
+
+static void sprd_pmic_eic_irq_unmask(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
+
+ pmic_eic->reg[REG_IE] = 1;
+ pmic_eic->reg[REG_TRIG] = 1;
+}
+
+static int sprd_pmic_eic_irq_set_type(struct irq_data *data,
+ unsigned int flow_type)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
+
+ switch (flow_type) {
+ case IRQ_TYPE_LEVEL_HIGH:
+ pmic_eic->reg[REG_IEV] = 1;
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ pmic_eic->reg[REG_IEV] = 0;
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ return 0;
+}
+
+static void sprd_pmic_eic_bus_lock(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
+
+ mutex_lock(&pmic_eic->buslock);
+}
+
+static void sprd_pmic_eic_bus_sync_unlock(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
+ u32 offset = irqd_to_hwirq(data);
+
+ /* Set irq type */
+ sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IEV,
+ pmic_eic->reg[REG_IEV]);
+ /* Set irq unmask */
+ sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IE,
+ pmic_eic->reg[REG_IE]);
+ /* Generate trigger start pulse for debounce EIC */
+ sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_TRIG,
+ pmic_eic->reg[REG_TRIG]);
+
+ mutex_unlock(&pmic_eic->buslock);
+}
+
+static irqreturn_t sprd_pmic_eic_irq_handler(int irq, void *data)
+{
+ struct sprd_pmic_eic *pmic_eic = data;
+ struct gpio_chip *chip = &pmic_eic->chip;
+ unsigned long status;
+ u32 n, girq, val;
+ int ret;
+
+ ret = regmap_read(pmic_eic->map, pmic_eic->offset + SPRD_PMIC_EIC_MIS,
+ &val);
+ if (ret)
+ return IRQ_RETVAL(ret);
+
+ status = val & SPRD_PMIC_EIC_DATA_MASK;
+
+ for_each_set_bit(n, &status, chip->ngpio) {
+ /* Clear the interrupt */
+ sprd_pmic_eic_update(chip, n, SPRD_PMIC_EIC_IC, 1);
+
+ girq = irq_find_mapping(chip->irq.domain, n);
+ handle_nested_irq(girq);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int sprd_pmic_eic_probe(struct platform_device *pdev)
+{
+ struct gpio_irq_chip *irq;
+ struct sprd_pmic_eic *pmic_eic;
+ int ret;
+
+ pmic_eic = devm_kzalloc(&pdev->dev, sizeof(*pmic_eic), GFP_KERNEL);
+ if (!pmic_eic)
+ return -ENOMEM;
+
+ mutex_init(&pmic_eic->buslock);
+
+ pmic_eic->irq = platform_get_irq(pdev, 0);
+ if (pmic_eic->irq < 0) {
+ dev_err(&pdev->dev, "Failed to get PMIC EIC interrupt.\n");
+ return pmic_eic->irq;
+ }
+
+ pmic_eic->map = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!pmic_eic->map)
+ return -ENODEV;
+
+ ret = of_property_read_u32(pdev->dev.of_node, "reg", &pmic_eic->offset);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to get PMIC EIC base address.\n");
+ return ret;
+ }
+
+ ret = devm_request_threaded_irq(&pdev->dev, pmic_eic->irq, NULL,
+ sprd_pmic_eic_irq_handler,
+ IRQF_TRIGGER_LOW |
+ IRQF_ONESHOT | IRQF_NO_SUSPEND,
+ dev_name(&pdev->dev), pmic_eic);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to request PMIC EIC IRQ.\n");
+ return ret;
+ }
+
+ pmic_eic->chip.label = dev_name(&pdev->dev);
+ pmic_eic->chip.ngpio = SPRD_PMIC_EIC_NR;
+ pmic_eic->chip.base = -1;
+ pmic_eic->chip.parent = &pdev->dev;
+ pmic_eic->chip.of_node = pdev->dev.of_node;
+ pmic_eic->chip.direction_input = sprd_pmic_eic_direction_input;
+ pmic_eic->chip.request = sprd_pmic_eic_request;
+ pmic_eic->chip.free = sprd_pmic_eic_free;
+ pmic_eic->chip.set_config = sprd_pmic_eic_set_config;
+ pmic_eic->chip.set = sprd_pmic_eic_set;
+ pmic_eic->chip.get = sprd_pmic_eic_get;
+
+ pmic_eic->intc.name = dev_name(&pdev->dev);
+ pmic_eic->intc.irq_mask = sprd_pmic_eic_irq_mask;
+ pmic_eic->intc.irq_unmask = sprd_pmic_eic_irq_unmask;
+ pmic_eic->intc.irq_set_type = sprd_pmic_eic_irq_set_type;
+ pmic_eic->intc.irq_bus_lock = sprd_pmic_eic_bus_lock;
+ pmic_eic->intc.irq_bus_sync_unlock = sprd_pmic_eic_bus_sync_unlock;
+ pmic_eic->intc.flags = IRQCHIP_SKIP_SET_WAKE;
+
+ irq = &pmic_eic->chip.irq;
+ irq->chip = &pmic_eic->intc;
+ irq->threaded = true;
+
+ ret = devm_gpiochip_add_data(&pdev->dev, &pmic_eic->chip, pmic_eic);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Could not register gpiochip %d.\n", ret);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, pmic_eic);
+ return 0;
+}
+
+static const struct of_device_id sprd_pmic_eic_of_match[] = {
+ { .compatible = "sprd,sc27xx-eic", },
+ { /* end of list */ }
+};
+MODULE_DEVICE_TABLE(of, sprd_pmic_eic_of_match);
+
+static struct platform_driver sprd_pmic_eic_driver = {
+ .probe = sprd_pmic_eic_probe,
+ .driver = {
+ .name = "sprd-pmic-eic",
+ .of_match_table = sprd_pmic_eic_of_match,
+ },
+};
+
+module_platform_driver(sprd_pmic_eic_driver);
+
+MODULE_DESCRIPTION("Spreadtrum PMIC EIC driver");
+MODULE_LICENSE("GPL v2");
projects / linux-platform-drivers-x86.git / commitdiff