This irq mux driver implements the RTD1295 SoC's non-linear mapping between status and enable bits.
Based in part on QNAP's arch/arm/mach-rtk119x/rtk_irq_mux.c and Synology's drivers/irqchip/irq-rtk.c code. Signed-off-by: Andreas Färber <[email protected]> --- v2 -> v3: * Adopted spin_lock_irq{save,restore}() (Marc) * Adopted single-write masking (Marc) * Adopted misc compatible string * Introduced explicit bit mapping * Adopted looped processing of pending interrupts (Marc) * Replaced unmask implementation with UMSK_ISR write * Introduced enable/disable ops and dropped no longer needed UART0 quirk v1 -> v2: * Renamed struct fields to avoid ambiguity (Marc) * Refactored offset lookup to avoid per-compatible init functions * Inserted white lines to clarify balanced locking (Marc) * Dropped forwarding of set_affinity to GIC (Marc) * Added spinlocks for consistency (Marc) * Limited initialization quirk to iso mux * Fixed spinlock initialization (Andrew) drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-rtd119x-mux.c | 291 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 292 insertions(+) create mode 100644 drivers/irqchip/irq-rtd119x-mux.c diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index 845abc107ad5..99a95428ac9d 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -79,3 +79,4 @@ obj-$(CONFIG_ARCH_ASPEED) += irq-aspeed-vic.o irq-aspeed-i2c-ic.o obj-$(CONFIG_STM32_EXTI) += irq-stm32-exti.o obj-$(CONFIG_QCOM_IRQ_COMBINER) += qcom-irq-combiner.o obj-$(CONFIG_IRQ_UNIPHIER_AIDET) += irq-uniphier-aidet.o +obj-$(CONFIG_ARCH_REALTEK) += irq-rtd119x-mux.o diff --git a/drivers/irqchip/irq-rtd119x-mux.c b/drivers/irqchip/irq-rtd119x-mux.c new file mode 100644 index 000000000000..ad6e2093fcd3 --- /dev/null +++ b/drivers/irqchip/irq-rtd119x-mux.c @@ -0,0 +1,291 @@ +/* + * Realtek RTD129x IRQ mux + * + * Copyright (c) 2017 Andreas Färber + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <linux/io.h> +#include <linux/irqchip.h> +#include <linux/irqchip/chained_irq.h> +#include <linux/irqdomain.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/slab.h> + +struct rtd119x_irq_mux_info { + unsigned isr_offset; + unsigned umsk_isr_offset; + unsigned scpu_int_en_offset; + const u32 *isr_to_scpu_int_en_mask; +}; + +struct rtd119x_irq_mux_data { + void __iomem *reg_isr; + void __iomem *reg_umsk_isr; + void __iomem *reg_scpu_int_en; + const struct rtd119x_irq_mux_info *info; + int irq; + struct irq_domain *domain; + spinlock_t lock; +}; + +static void rtd119x_mux_irq_handle(struct irq_desc *desc) +{ + struct rtd119x_irq_mux_data *data = irq_desc_get_handler_data(desc); + struct irq_chip *chip = irq_desc_get_chip(desc); + u32 scpu_int_en, isr, mask; + int ret, i; + + chained_irq_enter(chip, desc); + + scpu_int_en = readl_relaxed(data->reg_scpu_int_en); + isr = readl_relaxed(data->reg_isr); + + for (i = 0; i < 32; i++) { + if (!(isr & BIT(i))) + continue; + + mask = data->info->isr_to_scpu_int_en_mask[i]; + if (!(scpu_int_en & mask)) + continue; + + ret = generic_handle_irq(irq_find_mapping(data->domain, i)); + if (ret == 0) + writel_relaxed(BIT(i), data->reg_isr); + } + + chained_irq_exit(chip, desc); +} + +static void rtd119x_mux_mask_irq(struct irq_data *data) +{ + struct rtd119x_irq_mux_data *mux_data = irq_data_get_irq_chip_data(data); + + writel_relaxed(BIT(data->hwirq), mux_data->reg_isr); +} + +static void rtd119x_mux_unmask_irq(struct irq_data *data) +{ + struct rtd119x_irq_mux_data *mux_data = irq_data_get_irq_chip_data(data); + + writel_relaxed(BIT(data->hwirq), mux_data->reg_umsk_isr); +} + +static void rtd119x_mux_enable_irq(struct irq_data *data) +{ + struct rtd119x_irq_mux_data *mux_data = irq_data_get_irq_chip_data(data); + unsigned long flags; + u32 scpu_int_en, mask; + + mask = mux_data->info->isr_to_scpu_int_en_mask[data->hwirq]; + if (!mask) + return; + + spin_lock_irqsave(&mux_data->lock, flags); + + scpu_int_en = readl_relaxed(mux_data->reg_scpu_int_en); + scpu_int_en |= mask; + writel_relaxed(scpu_int_en, mux_data->reg_scpu_int_en); + + spin_unlock_irqrestore(&mux_data->lock, flags); +} + +static void rtd119x_mux_disable_irq(struct irq_data *data) +{ + struct rtd119x_irq_mux_data *mux_data = irq_data_get_irq_chip_data(data); + unsigned long flags; + u32 scpu_int_en, mask; + + mask = mux_data->info->isr_to_scpu_int_en_mask[data->hwirq]; + if (!mask) + return; + + spin_lock_irqsave(&mux_data->lock, flags); + + scpu_int_en = readl_relaxed(mux_data->reg_scpu_int_en); + scpu_int_en &= ~mask; + writel_relaxed(scpu_int_en, mux_data->reg_scpu_int_en); + + spin_unlock_irqrestore(&mux_data->lock, flags); +} + +static int rtd119x_mux_set_affinity(struct irq_data *d, + const struct cpumask *mask_val, bool force) +{ + /* Forwarding the affinity to the parent would affect all 32 interrupts. */ + return -EINVAL; +} + +static struct irq_chip rtd119x_mux_irq_chip = { + .name = "rtd119x-mux", + .irq_mask = rtd119x_mux_mask_irq, + .irq_unmask = rtd119x_mux_unmask_irq, + .irq_enable = rtd119x_mux_enable_irq, + .irq_disable = rtd119x_mux_disable_irq, + .irq_set_affinity = rtd119x_mux_set_affinity, +}; + +static int rtd119x_mux_irq_domain_map(struct irq_domain *d, + unsigned int irq, irq_hw_number_t hw) +{ + struct rtd119x_irq_mux_data *data = d->host_data; + + irq_set_chip_and_handler(irq, &rtd119x_mux_irq_chip, handle_level_irq); + irq_set_chip_data(irq, data); + irq_set_probe(irq); + + return 0; +} + +static struct irq_domain_ops rtd119x_mux_irq_domain_ops = { + .xlate = irq_domain_xlate_onecell, + .map = rtd119x_mux_irq_domain_map, +}; + +enum rtd129x_iso_isr_bits { + RTD1295_ISO_ISR_UR0_SHIFT = 2, + RTD1295_ISO_ISR_IRDA_SHIFT = 5, + RTD1295_ISO_ISR_I2C0_SHIFT = 8, + RTD1295_ISO_ISR_I2C1_SHIFT = 11, + RTD1295_ISO_ISR_RTC_HSEC_SHIFT, + RTD1295_ISO_ISR_RTC_ALARM_SHIFT, + RTD1295_ISO_ISR_GPIOA_SHIFT = 19, + RTD1295_ISO_ISR_GPIODA_SHIFT, + RTD1295_ISO_ISR_GPHY_DV_SHIFT = 29, + RTD1295_ISO_ISR_GPHY_AV_SHIFT, + RTD1295_ISO_ISR_I2C1_REQ_SHIFT, +}; + +static const u32 rtd129x_iso_isr_to_scpu_int_en_mask[32] = { + [RTD1295_ISO_ISR_UR0_SHIFT] = BIT(2), + [RTD1295_ISO_ISR_IRDA_SHIFT] = BIT(5), + [RTD1295_ISO_ISR_I2C0_SHIFT] = BIT(8), + [RTD1295_ISO_ISR_I2C1_SHIFT] = BIT(11), + [RTD1295_ISO_ISR_RTC_HSEC_SHIFT] = BIT(12), + [RTD1295_ISO_ISR_RTC_ALARM_SHIFT] = BIT(13), + [RTD1295_ISO_ISR_GPIOA_SHIFT] = BIT(19), + [RTD1295_ISO_ISR_GPIODA_SHIFT] = BIT(20), + [RTD1295_ISO_ISR_GPHY_DV_SHIFT] = BIT(29), + [RTD1295_ISO_ISR_GPHY_AV_SHIFT] = BIT(30), + [RTD1295_ISO_ISR_I2C1_REQ_SHIFT] = BIT(31), +}; + +enum rtd129x_misc_isr_bits { + RTD1295_ISR_UR1_SHIFT = 3, + RTD1295_ISR_UR1_TO_SHIFT = 5, + RTD1295_ISR_UR2_SHIFT = 8, + RTD1295_ISR_RTC_MIN_SHIFT = 10, + RTD1295_ISR_RTC_HOUR_SHIFT = 11, + RTD1295_ISR_RTC_DATA_SHIFT = 12, + RTD1295_ISR_UR2_TO_SHIFT = 13, + RTD1295_ISR_I2C5_SHIFT = 14, + RTD1295_ISR_I2C4_SHIFT = 15, + RTD1295_ISR_GPIOA_SHIFT = 19, + RTD1295_ISR_GPIODA_SHIFT = 20, + RTD1295_ISR_LSADC0_SHIFT = 21, + RTD1295_ISR_LSADC1_SHIFT = 22, + RTD1295_ISR_I2C3_SHIFT = 23, + RTD1295_ISR_SC0_SHIFT = 24, + RTD1295_ISR_I2C2_SHIFT = 26, + RTD1295_ISR_GSPI_SHIFT = 27, + RTD1295_ISR_FAN_SHIFT = 29, +}; + +static const u32 rtd129x_misc_isr_to_scpu_int_en_mask[32] = { + [RTD1295_ISR_UR1_SHIFT] = BIT(3), + [RTD1295_ISR_UR1_TO_SHIFT] = BIT(5), + [RTD1295_ISR_UR2_TO_SHIFT] = BIT(6), + [RTD1295_ISR_UR2_SHIFT] = BIT(7), + [RTD1295_ISR_RTC_MIN_SHIFT] = BIT(10), + [RTD1295_ISR_RTC_HOUR_SHIFT] = BIT(11), + [RTD1295_ISR_RTC_DATA_SHIFT] = BIT(12), + [RTD1295_ISR_I2C5_SHIFT] = BIT(14), + [RTD1295_ISR_I2C4_SHIFT] = BIT(15), + [RTD1295_ISR_GPIOA_SHIFT] = BIT(19), + [RTD1295_ISR_GPIODA_SHIFT] = BIT(20), + [RTD1295_ISR_LSADC0_SHIFT] = BIT(21), + [RTD1295_ISR_LSADC1_SHIFT] = BIT(22), + [RTD1295_ISR_SC0_SHIFT] = BIT(24), + [RTD1295_ISR_I2C2_SHIFT] = BIT(26), + [RTD1295_ISR_GSPI_SHIFT] = BIT(27), + [RTD1295_ISR_I2C3_SHIFT] = BIT(28), + [RTD1295_ISR_FAN_SHIFT] = BIT(29), +}; + +static const struct rtd119x_irq_mux_info rtd129x_iso_irq_mux_info = { + .isr_offset = 0x0, + .umsk_isr_offset = 0x4, + .scpu_int_en_offset = 0x40, + .isr_to_scpu_int_en_mask = rtd129x_iso_isr_to_scpu_int_en_mask, +}; + +static const struct rtd119x_irq_mux_info rtd129x_misc_irq_mux_info = { + .umsk_isr_offset = 0x8, + .isr_offset = 0xc, + .scpu_int_en_offset = 0x80, + .isr_to_scpu_int_en_mask = rtd129x_misc_isr_to_scpu_int_en_mask, +}; + +static const struct of_device_id rtd1295_irq_mux_dt_matches[] = { + { + .compatible = "realtek,rtd1295-iso-irq-mux", + .data = &rtd129x_iso_irq_mux_info, + }, { + .compatible = "realtek,rtd1295-misc-irq-mux", + .data = &rtd129x_misc_irq_mux_info, + }, { + } +}; + +static int __init rtd119x_irq_mux_init(struct device_node *node, + struct device_node *parent) +{ + struct rtd119x_irq_mux_data *data; + const struct of_device_id *match; + const struct rtd119x_irq_mux_info *info; + void __iomem *base; + + match = of_match_node(rtd1295_irq_mux_dt_matches, node); + if (!match) + return -EINVAL; + + info = match->data; + if (!info) + return -EINVAL; + + base = of_iomap(node, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->info = info; + data->reg_isr = base + info->isr_offset; + data->reg_umsk_isr = base + info->umsk_isr_offset; + data->reg_scpu_int_en = base + info->scpu_int_en_offset; + + data->irq = irq_of_parse_and_map(node, 0); + if (data->irq <= 0) { + kfree(data); + return -EINVAL; + } + + spin_lock_init(&data->lock); + + data->domain = irq_domain_add_linear(node, 32, + &rtd119x_mux_irq_domain_ops, data); + if (!data->domain) { + kfree(data); + return -ENOMEM; + } + + irq_set_chained_handler_and_data(data->irq, rtd119x_mux_irq_handle, data); + + return 0; +} +IRQCHIP_DECLARE(rtd1295_iso_mux, "realtek,rtd1295-iso-irq-mux", rtd119x_irq_mux_init); +IRQCHIP_DECLARE(rtd1295_misc_mux, "realtek,rtd1295-misc-irq-mux", rtd119x_irq_mux_init); -- 2.13.6
