diff options
Diffstat (limited to 'drivers/misc/hi6421v600-irq.c')
| -rw-r--r-- | drivers/misc/hi6421v600-irq.c | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/drivers/misc/hi6421v600-irq.c b/drivers/misc/hi6421v600-irq.c new file mode 100644 index 000000000..caa3de376 --- /dev/null +++ b/drivers/misc/hi6421v600-irq.c @@ -0,0 +1,306 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Device driver for irqs in HISI PMIC IC + * + * Copyright (c) 2013 Linaro Ltd. + * Copyright (c) 2011 Hisilicon. + * Copyright (c) 2020-2021 Huawei Technologies Co., Ltd. + */ + +#include <linux/bitops.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/module.h> +#include <linux/of_gpio.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/irqdomain.h> +#include <linux/regmap.h> + +struct hi6421v600_irq { + struct device *dev; + struct irq_domain *domain; + int irq; + unsigned int *irqs; + struct regmap *regmap; + + /* Protect IRQ mask changes */ + spinlock_t lock; +}; + +enum hi6421v600_irq_list { + OTMP = 0, + VBUS_CONNECT, + VBUS_DISCONNECT, + ALARMON_R, + HOLD_6S, + HOLD_1S, + POWERKEY_UP, + POWERKEY_DOWN, + OCP_SCP_R, + COUL_R, + SIM0_HPD_R, + SIM0_HPD_F, + SIM1_HPD_R, + SIM1_HPD_F, + + PMIC_IRQ_LIST_MAX +}; + +#define HISI_IRQ_BANK_SIZE 2 + +/* + * IRQ number for the power key button and mask for both UP and DOWN IRQs + */ +#define HISI_POWERKEY_IRQ_NUM 0 +#define HISI_IRQ_POWERKEY_UP_DOWN (BIT(POWERKEY_DOWN) | BIT(POWERKEY_UP)) + +/* + * Registers for IRQ address and IRQ mask bits + * + * Please notice that we need to regmap a larger region, as other + * registers are used by the irqs. + * See drivers/irq/hi6421-irq.c. + */ +#define SOC_PMIC_IRQ_MASK_0_ADDR 0x0202 +#define SOC_PMIC_IRQ0_ADDR 0x0212 + +/* + * The IRQs are mapped as: + * + * ====================== ============= ============ ===== + * IRQ MASK REGISTER IRQ REGISTER BIT + * ====================== ============= ============ ===== + * OTMP 0x0202 0x212 bit 0 + * VBUS_CONNECT 0x0202 0x212 bit 1 + * VBUS_DISCONNECT 0x0202 0x212 bit 2 + * ALARMON_R 0x0202 0x212 bit 3 + * HOLD_6S 0x0202 0x212 bit 4 + * HOLD_1S 0x0202 0x212 bit 5 + * POWERKEY_UP 0x0202 0x212 bit 6 + * POWERKEY_DOWN 0x0202 0x212 bit 7 + * + * OCP_SCP_R 0x0203 0x213 bit 0 + * COUL_R 0x0203 0x213 bit 1 + * SIM0_HPD_R 0x0203 0x213 bit 2 + * SIM0_HPD_F 0x0203 0x213 bit 3 + * SIM1_HPD_R 0x0203 0x213 bit 4 + * SIM1_HPD_F 0x0203 0x213 bit 5 + * ====================== ============= ============ ===== + * + * Each mask register contains 8 bits. The ancillary macros below + * convert a number from 0 to 14 into a register address and a bit mask + */ +#define HISI_IRQ_MASK_REG(irq_data) (SOC_PMIC_IRQ_MASK_0_ADDR + \ + (irqd_to_hwirq(irq_data) / BITS_PER_BYTE)) +#define HISI_IRQ_MASK_BIT(irq_data) BIT(irqd_to_hwirq(irq_data) & (BITS_PER_BYTE - 1)) +#define HISI_8BITS_MASK 0xff + +static irqreturn_t hi6421v600_irq_handler(int irq, void *__priv) +{ + struct hi6421v600_irq *priv = __priv; + unsigned long pending; + unsigned int in; + int i, offset; + + for (i = 0; i < HISI_IRQ_BANK_SIZE; i++) { + regmap_read(priv->regmap, SOC_PMIC_IRQ0_ADDR + i, &in); + + /* Mark pending IRQs as handled */ + regmap_write(priv->regmap, SOC_PMIC_IRQ0_ADDR + i, in); + + pending = in & HISI_8BITS_MASK; + + if (i == HISI_POWERKEY_IRQ_NUM && + (pending & HISI_IRQ_POWERKEY_UP_DOWN) == HISI_IRQ_POWERKEY_UP_DOWN) { + /* + * If both powerkey down and up IRQs are received, + * handle them at the right order + */ + generic_handle_irq_safe(priv->irqs[POWERKEY_DOWN]); + generic_handle_irq_safe(priv->irqs[POWERKEY_UP]); + pending &= ~HISI_IRQ_POWERKEY_UP_DOWN; + } + + if (!pending) + continue; + + for_each_set_bit(offset, &pending, BITS_PER_BYTE) { + generic_handle_irq_safe(priv->irqs[offset + i * BITS_PER_BYTE]); + } + } + + return IRQ_HANDLED; +} + +static void hi6421v600_irq_mask(struct irq_data *d) +{ + struct hi6421v600_irq *priv = irq_data_get_irq_chip_data(d); + unsigned long flags; + unsigned int data; + u32 offset; + + offset = HISI_IRQ_MASK_REG(d); + + spin_lock_irqsave(&priv->lock, flags); + + regmap_read(priv->regmap, offset, &data); + data |= HISI_IRQ_MASK_BIT(d); + regmap_write(priv->regmap, offset, data); + + spin_unlock_irqrestore(&priv->lock, flags); +} + +static void hi6421v600_irq_unmask(struct irq_data *d) +{ + struct hi6421v600_irq *priv = irq_data_get_irq_chip_data(d); + u32 data, offset; + unsigned long flags; + + offset = HISI_IRQ_MASK_REG(d); + + spin_lock_irqsave(&priv->lock, flags); + + regmap_read(priv->regmap, offset, &data); + data &= ~HISI_IRQ_MASK_BIT(d); + regmap_write(priv->regmap, offset, data); + + spin_unlock_irqrestore(&priv->lock, flags); +} + +static struct irq_chip hi6421v600_pmu_irqchip = { + .name = "hi6421v600-irq", + .irq_mask = hi6421v600_irq_mask, + .irq_unmask = hi6421v600_irq_unmask, + .irq_disable = hi6421v600_irq_mask, + .irq_enable = hi6421v600_irq_unmask, +}; + +static int hi6421v600_irq_map(struct irq_domain *d, unsigned int virq, + irq_hw_number_t hw) +{ + struct hi6421v600_irq *priv = d->host_data; + + irq_set_chip_and_handler_name(virq, &hi6421v600_pmu_irqchip, + handle_simple_irq, "hi6421v600"); + irq_set_chip_data(virq, priv); + irq_set_irq_type(virq, IRQ_TYPE_NONE); + + return 0; +} + +static const struct irq_domain_ops hi6421v600_domain_ops = { + .map = hi6421v600_irq_map, + .xlate = irq_domain_xlate_twocell, +}; + +static void hi6421v600_irq_init(struct hi6421v600_irq *priv) +{ + int i; + unsigned int pending; + + /* Mask all IRQs */ + for (i = 0; i < HISI_IRQ_BANK_SIZE; i++) + regmap_write(priv->regmap, SOC_PMIC_IRQ_MASK_0_ADDR + i, + HISI_8BITS_MASK); + + /* Mark all IRQs as handled */ + for (i = 0; i < HISI_IRQ_BANK_SIZE; i++) { + regmap_read(priv->regmap, SOC_PMIC_IRQ0_ADDR + i, &pending); + regmap_write(priv->regmap, SOC_PMIC_IRQ0_ADDR + i, + HISI_8BITS_MASK); + } +} + +static int hi6421v600_irq_probe(struct platform_device *pdev) +{ + struct device *pmic_dev = pdev->dev.parent; + struct device_node *np = pmic_dev->of_node; + struct platform_device *pmic_pdev; + struct device *dev = &pdev->dev; + struct hi6421v600_irq *priv; + struct regmap *regmap; + unsigned int virq; + int i, ret; + + /* + * This driver is meant to be called by hi6421-spmi-core, + * which should first set drvdata. If this doesn't happen, hit + * a warn on and return. + */ + regmap = dev_get_drvdata(pmic_dev); + if (WARN_ON(!regmap)) + return -ENODEV; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = dev; + priv->regmap = regmap; + + spin_lock_init(&priv->lock); + + pmic_pdev = container_of(pmic_dev, struct platform_device, dev); + + priv->irq = platform_get_irq(pmic_pdev, 0); + if (priv->irq < 0) { + dev_err(dev, "Error %d when getting IRQs\n", priv->irq); + return priv->irq; + } + + platform_set_drvdata(pdev, priv); + + hi6421v600_irq_init(priv); + + priv->irqs = devm_kzalloc(dev, PMIC_IRQ_LIST_MAX * sizeof(int), GFP_KERNEL); + if (!priv->irqs) + return -ENOMEM; + + priv->domain = irq_domain_add_simple(np, PMIC_IRQ_LIST_MAX, 0, + &hi6421v600_domain_ops, priv); + if (!priv->domain) { + dev_err(dev, "Failed to create IRQ domain\n"); + return -ENODEV; + } + + for (i = 0; i < PMIC_IRQ_LIST_MAX; i++) { + virq = irq_create_mapping(priv->domain, i); + if (!virq) { + dev_err(dev, "Failed to map H/W IRQ\n"); + return -ENODEV; + } + priv->irqs[i] = virq; + } + + ret = devm_request_threaded_irq(dev, + priv->irq, hi6421v600_irq_handler, + NULL, + IRQF_TRIGGER_LOW | IRQF_SHARED | IRQF_NO_SUSPEND, + "pmic", priv); + if (ret < 0) { + dev_err(dev, "Failed to start IRQ handling thread: error %d\n", + ret); + return ret; + } + + return 0; +} + +static const struct platform_device_id hi6421v600_irq_table[] = { + { .name = "hi6421v600-irq" }, + {}, +}; +MODULE_DEVICE_TABLE(platform, hi6421v600_irq_table); + +static struct platform_driver hi6421v600_irq_driver = { + .id_table = hi6421v600_irq_table, + .driver = { + .name = "hi6421v600-irq", + }, + .probe = hi6421v600_irq_probe, +}; +module_platform_driver(hi6421v600_irq_driver); + +MODULE_DESCRIPTION("HiSilicon Hi6421v600 IRQ driver"); +MODULE_LICENSE("GPL v2"); |