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We just need to check the type, set the relevant bit in INTPCR accordingly, and fixup the type argument before calling the GIC's irq_set_type. In fact, the power-on-reset value of the INTPCR register on the LS1021A is so that all six lines have their polarity inverted. Hence any hardware connected to those lines is unusable without this: If the line is indeed active low, the generic GIC code will reject an irq spec with IRQ_TYPE_LEVEL_LOW, while if the line is active high, we must obviously disable the polarity inversion (writing 0 to the relevant bit) before unmasking the interrupt. Some other Layerscape SOCs (LS1043A, LS1046A) reportedly have a similar feature, just with a different number of external interrupt lines (and a different POR value for the INTPCR register). This driver should be prepared for supporting those by properly filling out the device tree node, but I don't have the full reference manual, nor the hardware to be able to test it. I do know, from a tiny clipout from one of the other reference manuals I was shown, that 1U< --- drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-ls-extirq.c | 176 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 177 insertions(+) create mode 100644 drivers/irqchip/irq-ls-extirq.c diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index d27e3e3619e0..6fe8612e6a49 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -77,6 +77,7 @@ obj-$(CONFIG_MVEBU_ICU) += irq-mvebu-icu.o obj-$(CONFIG_MVEBU_ODMI) += irq-mvebu-odmi.o obj-$(CONFIG_MVEBU_PIC) += irq-mvebu-pic.o obj-$(CONFIG_LS_SCFG_MSI) += irq-ls-scfg-msi.o +obj-$(CONFIG_SOC_LS1021A) += irq-ls-extirq.o obj-$(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 diff --git a/drivers/irqchip/irq-ls-extirq.c b/drivers/irqchip/irq-ls-extirq.c new file mode 100644 index 000000000000..e5665ad867d6 --- /dev/null +++ b/drivers/irqchip/irq-ls-extirq.c @@ -0,0 +1,176 @@ +// SPDX-License-Identifier: GPL-2.0 + +#define pr_fmt(fmt) "irq-ls-extirq: " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define MAXIRQ 12 + +struct extirq_chip_data { + struct regmap *syscon; + u32 intpcr; + bool bit_reverse; + u32 nirq; + u32 parent_irq[MAXIRQ]; +}; + +static int +ls_extirq_set_type(struct irq_data *data, unsigned int type) +{ + irq_hw_number_t hwirq = data->hwirq; + struct extirq_chip_data *chip_data = data->chip_data; + u32 value, mask; + + if (chip_data->bit_reverse) + mask = 1U << (31 - hwirq); + else + mask = 1U << hwirq; + + switch (type) { + case IRQ_TYPE_LEVEL_LOW: + type = IRQ_TYPE_LEVEL_HIGH; + value = mask; + break; + case IRQ_TYPE_EDGE_FALLING: + type = IRQ_TYPE_EDGE_RISING; + value = mask; + break; + case IRQ_TYPE_LEVEL_HIGH: + case IRQ_TYPE_EDGE_RISING: + value = 0; + break; + default: + return -EINVAL; + } + + regmap_update_bits(chip_data->syscon, chip_data->intpcr, mask, value); + + data = data->parent_data; + return data->chip->irq_set_type(data, type); +} + +static struct irq_chip extirq_chip = { + .name = "extirq", + .irq_mask = irq_chip_mask_parent, + .irq_unmask = irq_chip_unmask_parent, + .irq_eoi = irq_chip_eoi_parent, + .irq_set_type = ls_extirq_set_type, + .irq_retrigger = irq_chip_retrigger_hierarchy, + .irq_set_affinity = irq_chip_set_affinity_parent, + .flags = IRQCHIP_SET_TYPE_MASKED, +}; + +static int +ls_extirq_domain_translate(struct irq_domain *d, struct irq_fwspec *fwspec, + unsigned long *hwirq, unsigned int *type) +{ + if (!is_of_node(fwspec->fwnode)) + return -EINVAL; + + if (fwspec->param_count != 2) + return -EINVAL; + + *hwirq = fwspec->param[0]; + *type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK; + return 0; +} + +static int +ls_extirq_domain_alloc(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs, void *arg) +{ + irq_hw_number_t hwirq; + struct irq_fwspec *fwspec = arg; + struct irq_fwspec gic_fwspec; + struct extirq_chip_data *chip_data = domain->host_data; + + if (fwspec->param_count != 2) + return -EINVAL; + + hwirq = fwspec->param[0]; + if (hwirq >= chip_data->nirq) + return -EINVAL; + + irq_domain_set_hwirq_and_chip(domain, virq, hwirq, &extirq_chip, + chip_data); + + gic_fwspec.fwnode = domain->parent->fwnode; + gic_fwspec.param_count = 3; + gic_fwspec.param[0] = GIC_SPI; + gic_fwspec.param[1] = chip_data->parent_irq[hwirq]; + gic_fwspec.param[2] = fwspec->param[1]; + + return irq_domain_alloc_irqs_parent(domain, virq, 1, &gic_fwspec); +} + +static const struct irq_domain_ops extirq_domain_ops = { + .translate = ls_extirq_domain_translate, + .alloc = ls_extirq_domain_alloc, + .free = irq_domain_free_irqs_common, +}; + +static int __init +ls_extirq_of_init(struct device_node *node, struct device_node *parent) +{ + + struct irq_domain *domain, *domain_parent; + struct extirq_chip_data *chip; + const __be32 *intpcr; + int ret; + + domain_parent = irq_find_host(parent); + if (!domain_parent) { + pr_err("interrupt-parent not found\n"); + return -EINVAL; + } + + chip = kzalloc(sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->syscon = syscon_node_to_regmap(node->parent); + if (IS_ERR(chip->syscon)) { + ret = PTR_ERR(chip->syscon); + pr_err("Failed to lookup parent regmap\n"); + goto err; + } + intpcr = of_get_address(node, 0, NULL, NULL); + if (!intpcr) { + ret = -ENOENT; + pr_err("Missing INTPCR offset value\n"); + goto err; + } + chip->intpcr = __be32_to_cpu(*intpcr); + + ret = of_property_read_variable_u32_array(node, "fsl,extirq-map", + chip->parent_irq, + 1, ARRAY_SIZE(chip->parent_irq)); + if (ret < 0) + goto err; + chip->nirq = ret; + chip->bit_reverse = of_property_read_bool(node, "fsl,bit-reverse"); + + domain = irq_domain_add_hierarchy(domain_parent, 0, chip->nirq, node, + &extirq_domain_ops, chip); + if (!domain) { + ret = -ENOMEM; + goto err; + } + + return 0; + +err: + kfree(chip); + return ret; +} + +IRQCHIP_DECLARE(ls1021a_extirq, "fsl,ls1021a-extirq", ls_extirq_of_init); -- 2.15.1