This irq mux driver is derived from the RTD1295 vendor DT and assumes a linear mapping between intr_en and intr_status registers. Code for RTD119x indicates this may not always be the case (i2c_3).
The register initialization was copied from QNAP's mach-rtk119x/rtk_irq_mux.c as a boot fix, without full insights into what exactly this is changing (TODO). Signed-off-by: Andreas Färber <[email protected]> --- drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-rtd119x-mux.c | 201 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 202 insertions(+) create mode 100644 drivers/irqchip/irq-rtd119x-mux.c diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index e88d856cc09c..46202a0b7d96 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -78,3 +78,4 @@ obj-$(CONFIG_EZNPS_GIC) += irq-eznps.o obj-$(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_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..c6c1ba126bf3 --- /dev/null +++ b/drivers/irqchip/irq-rtd119x-mux.c @@ -0,0 +1,201 @@ +/* + * 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 intr_status; + unsigned intr_en; +}; + +struct rtd119x_irq_mux_data { + void __iomem *intr_status; + void __iomem *intr_en; + 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 intr_en, intr_status, status; + int ret; + + chained_irq_enter(chip, desc); + + spin_lock(&data->lock); + intr_en = readl(data->intr_en); + intr_status = readl(data->intr_status); + spin_unlock(&data->lock); + + status = intr_status & intr_en; + if (status != 0) { + unsigned irq = __ffs(status); + ret = generic_handle_irq(irq_find_mapping(data->domain, irq)); + if (ret == 0) { + spin_lock(&data->lock); + intr_status = readl(data->intr_status); + intr_status |= BIT(irq - 1); + writel(intr_status, data->intr_status); + spin_unlock(&data->lock); + } + } + + 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); + u32 intr_status; + + intr_status = readl(mux_data->intr_status); + intr_status |= BIT(data->hwirq); + writel(intr_status, mux_data->intr_status); +} + +static void rtd119x_mux_unmask_irq(struct irq_data *data) +{ + struct rtd119x_irq_mux_data *mux_data = irq_data_get_irq_chip_data(data); + u32 intr_en; + + intr_en = readl(mux_data->intr_en); + intr_en |= BIT(data->hwirq); + writel(intr_en, mux_data->intr_en); +} + +static int rtd119x_mux_set_affinity(struct irq_data *d, + const struct cpumask *mask_val, bool force) +{ + struct rtd119x_irq_mux_data *mux_data = irq_data_get_irq_chip_data(d); + struct irq_chip *chip = irq_get_chip(mux_data->irq); + struct irq_data *data = irq_get_irq_data(mux_data->irq); + + if (chip && chip->irq_set_affinity) + return chip->irq_set_affinity(data, mask_val, force); + + 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_set_affinity = rtd119x_mux_set_affinity, +}; + +static int rtd119x_mux_irq_domain_xlate(struct irq_domain *d, + struct device_node *controller, + const u32 *intspec, unsigned int intsize, + unsigned long *out_hwirq, + unsigned int *out_type) +{ + if (irq_domain_get_of_node(d) != controller) + return -EINVAL; + + if (intsize < 1) + return -EINVAL; + + *out_hwirq = intspec[0]; + *out_type = 0; + + return 0; +} + +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 = rtd119x_mux_irq_domain_xlate, + .map = rtd119x_mux_irq_domain_map, +}; + +static int __init rtd119x_irq_mux_init(struct device_node *node, + struct device_node *parent, + const struct rtd119x_irq_mux_info *info) +{ + struct rtd119x_irq_mux_data *data; + void __iomem *base; + u32 val; + + base = of_iomap(node, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->intr_status = base + info->intr_status; + data->intr_en = base + info->intr_en; + + data->irq = irq_of_parse_and_map(node, 0); + if (data->irq <= 0) { + kfree(data); + return -EINVAL; + } + + data->domain = irq_domain_add_linear(node, 32, + &rtd119x_mux_irq_domain_ops, data); + if (!data->domain) { + kfree(data); + return -ENOMEM; + } + + /* TODO Investigate why these are necessary (from downstream rtk119x rtk_irq_mux.c) */ + val = readl(data->intr_en); + val &= ~BIT(2); + writel(val, data->intr_en); + + writel(BIT(2), data->intr_status); + + irq_set_chained_handler_and_data(data->irq, rtd119x_mux_irq_handle, data); + + return 0; +} + +static const struct rtd119x_irq_mux_info rtd1295_iso_irq_mux_info = { + .intr_status = 0x0, + .intr_en = 0x40, +}; + +static int __init rtd1295_iso_irq_mux_init(struct device_node *node, + struct device_node *parent) +{ + return rtd119x_irq_mux_init(node, parent, &rtd1295_iso_irq_mux_info); +} +IRQCHIP_DECLARE(rtd1295_iso_mux, "realtek,rtd1295-iso-irq-mux", rtd1295_iso_irq_mux_init); + +static const struct rtd119x_irq_mux_info rtd1295_irq_mux_info = { + .intr_status = 0xc, + .intr_en = 0x80, +}; + +static int __init rtd1295_irq_mux_init(struct device_node *node, + struct device_node *parent) +{ + return rtd119x_irq_mux_init(node, parent, &rtd1295_irq_mux_info); +} +IRQCHIP_DECLARE(rtd1295_mux, "realtek,rtd1295-irq-mux", rtd1295_irq_mux_init); -- 2.12.3
