diff options
Diffstat (limited to 'drivers/irqchip/irq-owl-sirq.c')
| -rw-r--r-- | drivers/irqchip/irq-owl-sirq.c | 359 |
1 files changed, 359 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-owl-sirq.c b/drivers/irqchip/irq-owl-sirq.c new file mode 100644 index 000000000000..6e4127465094 --- /dev/null +++ b/drivers/irqchip/irq-owl-sirq.c @@ -0,0 +1,359 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Actions Semi Owl SoCs SIRQ interrupt controller driver + * + * Copyright (C) 2014 Actions Semi Inc. + * David Liu <liuwei@actions-semi.com> + * + * Author: Parthiban Nallathambi <pn@denx.de> + * Author: Saravanan Sekar <sravanhome@gmail.com> + * Author: Cristian Ciocaltea <cristian.ciocaltea@gmail.com> + */ + +#include <linux/bitfield.h> +#include <linux/interrupt.h> +#include <linux/irqchip.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> + +#include <dt-bindings/interrupt-controller/arm-gic.h> + +#define NUM_SIRQ 3 + +#define INTC_EXTCTL_PENDING BIT(0) +#define INTC_EXTCTL_CLK_SEL BIT(4) +#define INTC_EXTCTL_EN BIT(5) +#define INTC_EXTCTL_TYPE_MASK GENMASK(7, 6) +#define INTC_EXTCTL_TYPE_HIGH 0 +#define INTC_EXTCTL_TYPE_LOW BIT(6) +#define INTC_EXTCTL_TYPE_RISING BIT(7) +#define INTC_EXTCTL_TYPE_FALLING (BIT(6) | BIT(7)) + +/* S500 & S700 SIRQ control register masks */ +#define INTC_EXTCTL_SIRQ0_MASK GENMASK(23, 16) +#define INTC_EXTCTL_SIRQ1_MASK GENMASK(15, 8) +#define INTC_EXTCTL_SIRQ2_MASK GENMASK(7, 0) + +/* S900 SIRQ control register offsets, relative to controller base address */ +#define INTC_EXTCTL0 0x0000 +#define INTC_EXTCTL1 0x0328 +#define INTC_EXTCTL2 0x032c + +struct owl_sirq_params { + /* INTC_EXTCTL reg shared for all three SIRQ lines */ + bool reg_shared; + /* INTC_EXTCTL reg offsets relative to controller base address */ + u16 reg_offset[NUM_SIRQ]; +}; + +struct owl_sirq_chip_data { + const struct owl_sirq_params *params; + void __iomem *base; + raw_spinlock_t lock; + u32 ext_irqs[NUM_SIRQ]; +}; + +/* S500 & S700 SoCs */ +static const struct owl_sirq_params owl_sirq_s500_params = { + .reg_shared = true, + .reg_offset = { 0, 0, 0 }, +}; + +/* S900 SoC */ +static const struct owl_sirq_params owl_sirq_s900_params = { + .reg_shared = false, + .reg_offset = { INTC_EXTCTL0, INTC_EXTCTL1, INTC_EXTCTL2 }, +}; + +static u32 owl_field_get(u32 val, u32 index) +{ + switch (index) { + case 0: + return FIELD_GET(INTC_EXTCTL_SIRQ0_MASK, val); + case 1: + return FIELD_GET(INTC_EXTCTL_SIRQ1_MASK, val); + case 2: + default: + return FIELD_GET(INTC_EXTCTL_SIRQ2_MASK, val); + } +} + +static u32 owl_field_prep(u32 val, u32 index) +{ + switch (index) { + case 0: + return FIELD_PREP(INTC_EXTCTL_SIRQ0_MASK, val); + case 1: + return FIELD_PREP(INTC_EXTCTL_SIRQ1_MASK, val); + case 2: + default: + return FIELD_PREP(INTC_EXTCTL_SIRQ2_MASK, val); + } +} + +static u32 owl_sirq_read_extctl(struct owl_sirq_chip_data *data, u32 index) +{ + u32 val; + + val = readl_relaxed(data->base + data->params->reg_offset[index]); + if (data->params->reg_shared) + val = owl_field_get(val, index); + + return val; +} + +static void owl_sirq_write_extctl(struct owl_sirq_chip_data *data, + u32 extctl, u32 index) +{ + u32 val; + + if (data->params->reg_shared) { + val = readl_relaxed(data->base + data->params->reg_offset[index]); + val &= ~owl_field_prep(0xff, index); + extctl = owl_field_prep(extctl, index) | val; + } + + writel_relaxed(extctl, data->base + data->params->reg_offset[index]); +} + +static void owl_sirq_clear_set_extctl(struct owl_sirq_chip_data *d, + u32 clear, u32 set, u32 index) +{ + unsigned long flags; + u32 val; + + raw_spin_lock_irqsave(&d->lock, flags); + val = owl_sirq_read_extctl(d, index); + val &= ~clear; + val |= set; + owl_sirq_write_extctl(d, val, index); + raw_spin_unlock_irqrestore(&d->lock, flags); +} + +static void owl_sirq_eoi(struct irq_data *data) +{ + struct owl_sirq_chip_data *chip_data = irq_data_get_irq_chip_data(data); + + /* + * Software must clear external interrupt pending, when interrupt type + * is edge triggered, so we need per SIRQ based clearing. + */ + if (!irqd_is_level_type(data)) + owl_sirq_clear_set_extctl(chip_data, 0, INTC_EXTCTL_PENDING, + data->hwirq); + + irq_chip_eoi_parent(data); +} + +static void owl_sirq_mask(struct irq_data *data) +{ + struct owl_sirq_chip_data *chip_data = irq_data_get_irq_chip_data(data); + + owl_sirq_clear_set_extctl(chip_data, INTC_EXTCTL_EN, 0, data->hwirq); + irq_chip_mask_parent(data); +} + +static void owl_sirq_unmask(struct irq_data *data) +{ + struct owl_sirq_chip_data *chip_data = irq_data_get_irq_chip_data(data); + + owl_sirq_clear_set_extctl(chip_data, 0, INTC_EXTCTL_EN, data->hwirq); + irq_chip_unmask_parent(data); +} + +/* + * GIC does not handle falling edge or active low, hence SIRQ shall be + * programmed to convert falling edge to rising edge signal and active + * low to active high signal. + */ +static int owl_sirq_set_type(struct irq_data *data, unsigned int type) +{ + struct owl_sirq_chip_data *chip_data = irq_data_get_irq_chip_data(data); + u32 sirq_type; + + switch (type) { + case IRQ_TYPE_LEVEL_LOW: + sirq_type = INTC_EXTCTL_TYPE_LOW; + type = IRQ_TYPE_LEVEL_HIGH; + break; + case IRQ_TYPE_LEVEL_HIGH: + sirq_type = INTC_EXTCTL_TYPE_HIGH; + break; + case IRQ_TYPE_EDGE_FALLING: + sirq_type = INTC_EXTCTL_TYPE_FALLING; + type = IRQ_TYPE_EDGE_RISING; + break; + case IRQ_TYPE_EDGE_RISING: + sirq_type = INTC_EXTCTL_TYPE_RISING; + break; + default: + return -EINVAL; + } + + owl_sirq_clear_set_extctl(chip_data, INTC_EXTCTL_TYPE_MASK, sirq_type, + data->hwirq); + + return irq_chip_set_type_parent(data, type); +} + +static struct irq_chip owl_sirq_chip = { + .name = "owl-sirq", + .irq_mask = owl_sirq_mask, + .irq_unmask = owl_sirq_unmask, + .irq_eoi = owl_sirq_eoi, + .irq_set_type = owl_sirq_set_type, + .irq_retrigger = irq_chip_retrigger_hierarchy, +#ifdef CONFIG_SMP + .irq_set_affinity = irq_chip_set_affinity_parent, +#endif +}; + +static int owl_sirq_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 || fwspec->param[0] >= NUM_SIRQ) + return -EINVAL; + + *hwirq = fwspec->param[0]; + *type = fwspec->param[1]; + + return 0; +} + +static int owl_sirq_domain_alloc(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs, void *data) +{ + struct owl_sirq_chip_data *chip_data = domain->host_data; + struct irq_fwspec *fwspec = data; + struct irq_fwspec parent_fwspec; + irq_hw_number_t hwirq; + unsigned int type; + int ret; + + if (WARN_ON(nr_irqs != 1)) + return -EINVAL; + + ret = owl_sirq_domain_translate(domain, fwspec, &hwirq, &type); + if (ret) + return ret; + + switch (type) { + case IRQ_TYPE_EDGE_RISING: + case IRQ_TYPE_LEVEL_HIGH: + break; + case IRQ_TYPE_EDGE_FALLING: + type = IRQ_TYPE_EDGE_RISING; + break; + case IRQ_TYPE_LEVEL_LOW: + type = IRQ_TYPE_LEVEL_HIGH; + break; + default: + return -EINVAL; + } + + irq_domain_set_hwirq_and_chip(domain, virq, hwirq, &owl_sirq_chip, + chip_data); + + parent_fwspec.fwnode = domain->parent->fwnode; + parent_fwspec.param_count = 3; + parent_fwspec.param[0] = GIC_SPI; + parent_fwspec.param[1] = chip_data->ext_irqs[hwirq]; + parent_fwspec.param[2] = type; + + return irq_domain_alloc_irqs_parent(domain, virq, 1, &parent_fwspec); +} + +static const struct irq_domain_ops owl_sirq_domain_ops = { + .translate = owl_sirq_domain_translate, + .alloc = owl_sirq_domain_alloc, + .free = irq_domain_free_irqs_common, +}; + +static int __init owl_sirq_init(const struct owl_sirq_params *params, + struct device_node *node, + struct device_node *parent) +{ + struct irq_domain *domain, *parent_domain; + struct owl_sirq_chip_data *chip_data; + int ret, i; + + parent_domain = irq_find_host(parent); + if (!parent_domain) { + pr_err("%pOF: failed to find sirq parent domain\n", node); + return -ENXIO; + } + + chip_data = kzalloc(sizeof(*chip_data), GFP_KERNEL); + if (!chip_data) + return -ENOMEM; + + raw_spin_lock_init(&chip_data->lock); + + chip_data->params = params; + + chip_data->base = of_iomap(node, 0); + if (!chip_data->base) { + pr_err("%pOF: failed to map sirq registers\n", node); + ret = -ENXIO; + goto out_free; + } + + for (i = 0; i < NUM_SIRQ; i++) { + struct of_phandle_args irq; + + ret = of_irq_parse_one(node, i, &irq); + if (ret) { + pr_err("%pOF: failed to parse interrupt %d\n", node, i); + goto out_unmap; + } + + if (WARN_ON(irq.args_count != 3)) { + ret = -EINVAL; + goto out_unmap; + } + + chip_data->ext_irqs[i] = irq.args[1]; + + /* Set 24MHz external interrupt clock freq */ + owl_sirq_clear_set_extctl(chip_data, 0, INTC_EXTCTL_CLK_SEL, i); + } + + domain = irq_domain_add_hierarchy(parent_domain, 0, NUM_SIRQ, node, + &owl_sirq_domain_ops, chip_data); + if (!domain) { + pr_err("%pOF: failed to add domain\n", node); + ret = -ENOMEM; + goto out_unmap; + } + + return 0; + +out_unmap: + iounmap(chip_data->base); +out_free: + kfree(chip_data); + + return ret; +} + +static int __init owl_sirq_s500_of_init(struct device_node *node, + struct device_node *parent) +{ + return owl_sirq_init(&owl_sirq_s500_params, node, parent); +} + +IRQCHIP_DECLARE(owl_sirq_s500, "actions,s500-sirq", owl_sirq_s500_of_init); +IRQCHIP_DECLARE(owl_sirq_s700, "actions,s700-sirq", owl_sirq_s500_of_init); + +static int __init owl_sirq_s900_of_init(struct device_node *node, + struct device_node *parent) +{ + return owl_sirq_init(&owl_sirq_s900_params, node, parent); +} + +IRQCHIP_DECLARE(owl_sirq_s900, "actions,s900-sirq", owl_sirq_s900_of_init); |