diff options
Diffstat (limited to 'drivers/mfd/mt6358-irq.c')
| -rw-r--r-- | drivers/mfd/mt6358-irq.c | 295 |
1 files changed, 295 insertions, 0 deletions
diff --git a/drivers/mfd/mt6358-irq.c b/drivers/mfd/mt6358-irq.c new file mode 100644 index 000000000..389756436 --- /dev/null +++ b/drivers/mfd/mt6358-irq.c @@ -0,0 +1,295 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Copyright (c) 2020 MediaTek Inc. + +#include <linux/interrupt.h> +#include <linux/mfd/mt6357/core.h> +#include <linux/mfd/mt6357/registers.h> +#include <linux/mfd/mt6358/core.h> +#include <linux/mfd/mt6358/registers.h> +#include <linux/mfd/mt6359/core.h> +#include <linux/mfd/mt6359/registers.h> +#include <linux/mfd/mt6397/core.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_irq.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +#define MTK_PMIC_REG_WIDTH 16 + +static const struct irq_top_t mt6357_ints[] = { + MT6357_TOP_GEN(BUCK), + MT6357_TOP_GEN(LDO), + MT6357_TOP_GEN(PSC), + MT6357_TOP_GEN(SCK), + MT6357_TOP_GEN(BM), + MT6357_TOP_GEN(HK), + MT6357_TOP_GEN(AUD), + MT6357_TOP_GEN(MISC), +}; + +static const struct irq_top_t mt6358_ints[] = { + MT6358_TOP_GEN(BUCK), + MT6358_TOP_GEN(LDO), + MT6358_TOP_GEN(PSC), + MT6358_TOP_GEN(SCK), + MT6358_TOP_GEN(BM), + MT6358_TOP_GEN(HK), + MT6358_TOP_GEN(AUD), + MT6358_TOP_GEN(MISC), +}; + +static const struct irq_top_t mt6359_ints[] = { + MT6359_TOP_GEN(BUCK), + MT6359_TOP_GEN(LDO), + MT6359_TOP_GEN(PSC), + MT6359_TOP_GEN(SCK), + MT6359_TOP_GEN(BM), + MT6359_TOP_GEN(HK), + MT6359_TOP_GEN(AUD), + MT6359_TOP_GEN(MISC), +}; + +static struct pmic_irq_data mt6357_irqd = { + .num_top = ARRAY_SIZE(mt6357_ints), + .num_pmic_irqs = MT6357_IRQ_NR, + .top_int_status_reg = MT6357_TOP_INT_STATUS0, + .pmic_ints = mt6357_ints, +}; + +static struct pmic_irq_data mt6358_irqd = { + .num_top = ARRAY_SIZE(mt6358_ints), + .num_pmic_irqs = MT6358_IRQ_NR, + .top_int_status_reg = MT6358_TOP_INT_STATUS0, + .pmic_ints = mt6358_ints, +}; + +static struct pmic_irq_data mt6359_irqd = { + .num_top = ARRAY_SIZE(mt6359_ints), + .num_pmic_irqs = MT6359_IRQ_NR, + .top_int_status_reg = MT6359_TOP_INT_STATUS0, + .pmic_ints = mt6359_ints, +}; + +static void pmic_irq_enable(struct irq_data *data) +{ + unsigned int hwirq = irqd_to_hwirq(data); + struct mt6397_chip *chip = irq_data_get_irq_chip_data(data); + struct pmic_irq_data *irqd = chip->irq_data; + + irqd->enable_hwirq[hwirq] = true; +} + +static void pmic_irq_disable(struct irq_data *data) +{ + unsigned int hwirq = irqd_to_hwirq(data); + struct mt6397_chip *chip = irq_data_get_irq_chip_data(data); + struct pmic_irq_data *irqd = chip->irq_data; + + irqd->enable_hwirq[hwirq] = false; +} + +static void pmic_irq_lock(struct irq_data *data) +{ + struct mt6397_chip *chip = irq_data_get_irq_chip_data(data); + + mutex_lock(&chip->irqlock); +} + +static void pmic_irq_sync_unlock(struct irq_data *data) +{ + unsigned int i, top_gp, gp_offset, en_reg, int_regs, shift; + struct mt6397_chip *chip = irq_data_get_irq_chip_data(data); + struct pmic_irq_data *irqd = chip->irq_data; + + for (i = 0; i < irqd->num_pmic_irqs; i++) { + if (irqd->enable_hwirq[i] == irqd->cache_hwirq[i]) + continue; + + /* Find out the IRQ group */ + top_gp = 0; + while ((top_gp + 1) < irqd->num_top && + i >= irqd->pmic_ints[top_gp + 1].hwirq_base) + top_gp++; + + /* Find the IRQ registers */ + gp_offset = i - irqd->pmic_ints[top_gp].hwirq_base; + int_regs = gp_offset / MTK_PMIC_REG_WIDTH; + shift = gp_offset % MTK_PMIC_REG_WIDTH; + en_reg = irqd->pmic_ints[top_gp].en_reg + + (irqd->pmic_ints[top_gp].en_reg_shift * int_regs); + + regmap_update_bits(chip->regmap, en_reg, BIT(shift), + irqd->enable_hwirq[i] << shift); + + irqd->cache_hwirq[i] = irqd->enable_hwirq[i]; + } + mutex_unlock(&chip->irqlock); +} + +static struct irq_chip mt6358_irq_chip = { + .name = "mt6358-irq", + .flags = IRQCHIP_SKIP_SET_WAKE, + .irq_enable = pmic_irq_enable, + .irq_disable = pmic_irq_disable, + .irq_bus_lock = pmic_irq_lock, + .irq_bus_sync_unlock = pmic_irq_sync_unlock, +}; + +static void mt6358_irq_sp_handler(struct mt6397_chip *chip, + unsigned int top_gp) +{ + unsigned int irq_status, sta_reg, status; + unsigned int hwirq, virq; + int i, j, ret; + struct pmic_irq_data *irqd = chip->irq_data; + + for (i = 0; i < irqd->pmic_ints[top_gp].num_int_regs; i++) { + sta_reg = irqd->pmic_ints[top_gp].sta_reg + + irqd->pmic_ints[top_gp].sta_reg_shift * i; + + ret = regmap_read(chip->regmap, sta_reg, &irq_status); + if (ret) { + dev_err(chip->dev, + "Failed to read IRQ status, ret=%d\n", ret); + return; + } + + if (!irq_status) + continue; + + status = irq_status; + do { + j = __ffs(status); + + hwirq = irqd->pmic_ints[top_gp].hwirq_base + + MTK_PMIC_REG_WIDTH * i + j; + + virq = irq_find_mapping(chip->irq_domain, hwirq); + if (virq) + handle_nested_irq(virq); + + status &= ~BIT(j); + } while (status); + + regmap_write(chip->regmap, sta_reg, irq_status); + } +} + +static irqreturn_t mt6358_irq_handler(int irq, void *data) +{ + struct mt6397_chip *chip = data; + struct pmic_irq_data *irqd = chip->irq_data; + unsigned int bit, i, top_irq_status = 0; + int ret; + + ret = regmap_read(chip->regmap, + irqd->top_int_status_reg, + &top_irq_status); + if (ret) { + dev_err(chip->dev, + "Failed to read status from the device, ret=%d\n", ret); + return IRQ_NONE; + } + + for (i = 0; i < irqd->num_top; i++) { + bit = BIT(irqd->pmic_ints[i].top_offset); + if (top_irq_status & bit) { + mt6358_irq_sp_handler(chip, i); + top_irq_status &= ~bit; + if (!top_irq_status) + break; + } + } + + return IRQ_HANDLED; +} + +static int pmic_irq_domain_map(struct irq_domain *d, unsigned int irq, + irq_hw_number_t hw) +{ + struct mt6397_chip *mt6397 = d->host_data; + + irq_set_chip_data(irq, mt6397); + irq_set_chip_and_handler(irq, &mt6358_irq_chip, handle_level_irq); + irq_set_nested_thread(irq, 1); + irq_set_noprobe(irq); + + return 0; +} + +static const struct irq_domain_ops mt6358_irq_domain_ops = { + .map = pmic_irq_domain_map, + .xlate = irq_domain_xlate_twocell, +}; + +int mt6358_irq_init(struct mt6397_chip *chip) +{ + int i, j, ret; + struct pmic_irq_data *irqd; + + switch (chip->chip_id) { + case MT6357_CHIP_ID: + chip->irq_data = &mt6357_irqd; + break; + + case MT6358_CHIP_ID: + case MT6366_CHIP_ID: + chip->irq_data = &mt6358_irqd; + break; + + case MT6359_CHIP_ID: + chip->irq_data = &mt6359_irqd; + break; + + default: + dev_err(chip->dev, "unsupported chip: 0x%x\n", chip->chip_id); + return -ENODEV; + } + + mutex_init(&chip->irqlock); + irqd = chip->irq_data; + irqd->enable_hwirq = devm_kcalloc(chip->dev, + irqd->num_pmic_irqs, + sizeof(*irqd->enable_hwirq), + GFP_KERNEL); + if (!irqd->enable_hwirq) + return -ENOMEM; + + irqd->cache_hwirq = devm_kcalloc(chip->dev, + irqd->num_pmic_irqs, + sizeof(*irqd->cache_hwirq), + GFP_KERNEL); + if (!irqd->cache_hwirq) + return -ENOMEM; + + /* Disable all interrupts for initializing */ + for (i = 0; i < irqd->num_top; i++) { + for (j = 0; j < irqd->pmic_ints[i].num_int_regs; j++) + regmap_write(chip->regmap, + irqd->pmic_ints[i].en_reg + + irqd->pmic_ints[i].en_reg_shift * j, 0); + } + + chip->irq_domain = irq_domain_add_linear(chip->dev->of_node, + irqd->num_pmic_irqs, + &mt6358_irq_domain_ops, chip); + if (!chip->irq_domain) { + dev_err(chip->dev, "Could not create IRQ domain\n"); + return -ENODEV; + } + + ret = devm_request_threaded_irq(chip->dev, chip->irq, NULL, + mt6358_irq_handler, IRQF_ONESHOT, + mt6358_irq_chip.name, chip); + if (ret) { + dev_err(chip->dev, "Failed to register IRQ=%d, ret=%d\n", + chip->irq, ret); + return ret; + } + + enable_irq_wake(chip->irq); + return ret; +} |