From 3fed09559cd8be79568d368ce02bf7f2d56259b6 Mon Sep 17 00:00:00 2001 From: Lad Prabhakar Date: Thu, 7 Jul 2022 19:23:11 +0100 Subject: [PATCH] irqchip: Add RZ/G2L IA55 Interrupt Controller driver Add a driver for the Renesas RZ/G2L Interrupt Controller. This supports external pins being used as interrupts. It supports one line for NMI, 8 external pins and 32 GPIO pins (out of 123) to be used as IRQ lines. Signed-off-by: Lad Prabhakar Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20220707182314.66610-4-prabhakar.mahadev-lad.rj@bp.renesas.com --- drivers/irqchip/Kconfig | 8 + drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-renesas-rzg2l.c | 393 ++++++++++++++++++++++++++++ 3 files changed, 402 insertions(+) create mode 100644 drivers/irqchip/irq-renesas-rzg2l.c diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index 1f23a6be7d88..b1ab85171a3a 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -242,6 +242,14 @@ config RENESAS_RZA1_IRQC Enable support for the Renesas RZ/A1 Interrupt Controller, to use up to 8 external interrupts with configurable sense select. +config RENESAS_RZG2L_IRQC + bool "Renesas RZ/G2L (and alike SoC) IRQC support" if COMPILE_TEST + select GENERIC_IRQ_CHIP + select IRQ_DOMAIN_HIERARCHY + help + Enable support for the Renesas RZ/G2L (and alike SoC) Interrupt Controller + for external devices. + config SL28CPLD_INTC bool "Kontron sl28cpld IRQ controller" depends on MFD_SL28CPLD=y || COMPILE_TEST diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index 5b67450a9538..04cb15b647c5 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -51,6 +51,7 @@ obj-$(CONFIG_RDA_INTC) += irq-rda-intc.o obj-$(CONFIG_RENESAS_INTC_IRQPIN) += irq-renesas-intc-irqpin.o obj-$(CONFIG_RENESAS_IRQC) += irq-renesas-irqc.o obj-$(CONFIG_RENESAS_RZA1_IRQC) += irq-renesas-rza1.o +obj-$(CONFIG_RENESAS_RZG2L_IRQC) += irq-renesas-rzg2l.o obj-$(CONFIG_VERSATILE_FPGA_IRQ) += irq-versatile-fpga.o obj-$(CONFIG_ARCH_NSPIRE) += irq-zevio.o obj-$(CONFIG_ARCH_VT8500) += irq-vt8500.o diff --git a/drivers/irqchip/irq-renesas-rzg2l.c b/drivers/irqchip/irq-renesas-rzg2l.c new file mode 100644 index 000000000000..25fd8ee66565 --- /dev/null +++ b/drivers/irqchip/irq-renesas-rzg2l.c @@ -0,0 +1,393 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Renesas RZ/G2L IRQC Driver + * + * Copyright (C) 2022 Renesas Electronics Corporation. + * + * Author: Lad Prabhakar + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define IRQC_IRQ_START 1 +#define IRQC_IRQ_COUNT 8 +#define IRQC_TINT_START (IRQC_IRQ_START + IRQC_IRQ_COUNT) +#define IRQC_TINT_COUNT 32 +#define IRQC_NUM_IRQ (IRQC_TINT_START + IRQC_TINT_COUNT) + +#define ISCR 0x10 +#define IITSR 0x14 +#define TSCR 0x20 +#define TITSR0 0x24 +#define TITSR1 0x28 +#define TITSR0_MAX_INT 16 +#define TITSEL_WIDTH 0x2 +#define TSSR(n) (0x30 + ((n) * 4)) +#define TIEN BIT(7) +#define TSSEL_SHIFT(n) (8 * (n)) +#define TSSEL_MASK GENMASK(7, 0) +#define IRQ_MASK 0x3 + +#define TSSR_OFFSET(n) ((n) % 4) +#define TSSR_INDEX(n) ((n) / 4) + +#define TITSR_TITSEL_EDGE_RISING 0 +#define TITSR_TITSEL_EDGE_FALLING 1 +#define TITSR_TITSEL_LEVEL_HIGH 2 +#define TITSR_TITSEL_LEVEL_LOW 3 + +#define IITSR_IITSEL(n, sense) ((sense) << ((n) * 2)) +#define IITSR_IITSEL_LEVEL_LOW 0 +#define IITSR_IITSEL_EDGE_FALLING 1 +#define IITSR_IITSEL_EDGE_RISING 2 +#define IITSR_IITSEL_EDGE_BOTH 3 +#define IITSR_IITSEL_MASK(n) IITSR_IITSEL((n), 3) + +#define TINT_EXTRACT_HWIRQ(x) FIELD_GET(GENMASK(15, 0), (x)) +#define TINT_EXTRACT_GPIOINT(x) FIELD_GET(GENMASK(31, 16), (x)) + +struct rzg2l_irqc_priv { + void __iomem *base; + struct irq_fwspec fwspec[IRQC_NUM_IRQ]; + raw_spinlock_t lock; +}; + +static struct rzg2l_irqc_priv *irq_data_to_priv(struct irq_data *data) +{ + return data->domain->host_data; +} + +static void rzg2l_irq_eoi(struct irq_data *d) +{ + unsigned int hw_irq = irqd_to_hwirq(d) - IRQC_IRQ_START; + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d); + u32 bit = BIT(hw_irq); + u32 reg; + + reg = readl_relaxed(priv->base + ISCR); + if (reg & bit) + writel_relaxed(reg & ~bit, priv->base + ISCR); +} + +static void rzg2l_tint_eoi(struct irq_data *d) +{ + unsigned int hw_irq = irqd_to_hwirq(d) - IRQC_TINT_START; + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d); + u32 bit = BIT(hw_irq); + u32 reg; + + reg = readl_relaxed(priv->base + TSCR); + if (reg & bit) + writel_relaxed(reg & ~bit, priv->base + TSCR); +} + +static void rzg2l_irqc_eoi(struct irq_data *d) +{ + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d); + unsigned int hw_irq = irqd_to_hwirq(d); + + raw_spin_lock(&priv->lock); + if (hw_irq >= IRQC_IRQ_START && hw_irq <= IRQC_IRQ_COUNT) + rzg2l_irq_eoi(d); + else if (hw_irq >= IRQC_TINT_START && hw_irq < IRQC_NUM_IRQ) + rzg2l_tint_eoi(d); + raw_spin_unlock(&priv->lock); + irq_chip_eoi_parent(d); +} + +static void rzg2l_irqc_irq_disable(struct irq_data *d) +{ + unsigned int hw_irq = irqd_to_hwirq(d); + + if (hw_irq >= IRQC_TINT_START && hw_irq < IRQC_NUM_IRQ) { + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d); + u32 offset = hw_irq - IRQC_TINT_START; + u32 tssr_offset = TSSR_OFFSET(offset); + u8 tssr_index = TSSR_INDEX(offset); + u32 reg; + + raw_spin_lock(&priv->lock); + reg = readl_relaxed(priv->base + TSSR(tssr_index)); + reg &= ~(TSSEL_MASK << tssr_offset); + writel_relaxed(reg, priv->base + TSSR(tssr_index)); + raw_spin_unlock(&priv->lock); + } + irq_chip_disable_parent(d); +} + +static void rzg2l_irqc_irq_enable(struct irq_data *d) +{ + unsigned int hw_irq = irqd_to_hwirq(d); + + if (hw_irq >= IRQC_TINT_START && hw_irq < IRQC_NUM_IRQ) { + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d); + unsigned long tint = (uintptr_t)d->chip_data; + u32 offset = hw_irq - IRQC_TINT_START; + u32 tssr_offset = TSSR_OFFSET(offset); + u8 tssr_index = TSSR_INDEX(offset); + u32 reg; + + raw_spin_lock(&priv->lock); + reg = readl_relaxed(priv->base + TSSR(tssr_index)); + reg |= (TIEN | tint) << TSSEL_SHIFT(tssr_offset); + writel_relaxed(reg, priv->base + TSSR(tssr_index)); + raw_spin_unlock(&priv->lock); + } + irq_chip_enable_parent(d); +} + +static int rzg2l_irq_set_type(struct irq_data *d, unsigned int type) +{ + unsigned int hw_irq = irqd_to_hwirq(d) - IRQC_IRQ_START; + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d); + u16 sense, tmp; + + switch (type & IRQ_TYPE_SENSE_MASK) { + case IRQ_TYPE_LEVEL_LOW: + sense = IITSR_IITSEL_LEVEL_LOW; + break; + + case IRQ_TYPE_EDGE_FALLING: + sense = IITSR_IITSEL_EDGE_FALLING; + break; + + case IRQ_TYPE_EDGE_RISING: + sense = IITSR_IITSEL_EDGE_RISING; + break; + + case IRQ_TYPE_EDGE_BOTH: + sense = IITSR_IITSEL_EDGE_BOTH; + break; + + default: + return -EINVAL; + } + + raw_spin_lock(&priv->lock); + tmp = readl_relaxed(priv->base + IITSR); + tmp &= ~IITSR_IITSEL_MASK(hw_irq); + tmp |= IITSR_IITSEL(hw_irq, sense); + writel_relaxed(tmp, priv->base + IITSR); + raw_spin_unlock(&priv->lock); + + return 0; +} + +static int rzg2l_tint_set_edge(struct irq_data *d, unsigned int type) +{ + struct rzg2l_irqc_priv *priv = irq_data_to_priv(d); + unsigned int hwirq = irqd_to_hwirq(d); + u32 titseln = hwirq - IRQC_TINT_START; + u32 offset; + u8 sense; + u32 reg; + + switch (type & IRQ_TYPE_SENSE_MASK) { + case IRQ_TYPE_EDGE_RISING: + sense = TITSR_TITSEL_EDGE_RISING; + break; + + case IRQ_TYPE_EDGE_FALLING: + sense = TITSR_TITSEL_EDGE_FALLING; + break; + + default: + return -EINVAL; + } + + offset = TITSR0; + if (titseln >= TITSR0_MAX_INT) { + titseln -= TITSR0_MAX_INT; + offset = TITSR1; + } + + raw_spin_lock(&priv->lock); + reg = readl_relaxed(priv->base + offset); + reg &= ~(IRQ_MASK << (titseln * TITSEL_WIDTH)); + reg |= sense << (titseln * TITSEL_WIDTH); + writel_relaxed(reg, priv->base + offset); + raw_spin_unlock(&priv->lock); + + return 0; +} + +static int rzg2l_irqc_set_type(struct irq_data *d, unsigned int type) +{ + unsigned int hw_irq = irqd_to_hwirq(d); + int ret = -EINVAL; + + if (hw_irq >= IRQC_IRQ_START && hw_irq <= IRQC_IRQ_COUNT) + ret = rzg2l_irq_set_type(d, type); + else if (hw_irq >= IRQC_TINT_START && hw_irq < IRQC_NUM_IRQ) + ret = rzg2l_tint_set_edge(d, type); + if (ret) + return ret; + + return irq_chip_set_type_parent(d, IRQ_TYPE_LEVEL_HIGH); +} + +static const struct irq_chip irqc_chip = { + .name = "rzg2l-irqc", + .irq_eoi = rzg2l_irqc_eoi, + .irq_mask = irq_chip_mask_parent, + .irq_unmask = irq_chip_unmask_parent, + .irq_disable = rzg2l_irqc_irq_disable, + .irq_enable = rzg2l_irqc_irq_enable, + .irq_get_irqchip_state = irq_chip_get_parent_state, + .irq_set_irqchip_state = irq_chip_set_parent_state, + .irq_retrigger = irq_chip_retrigger_hierarchy, + .irq_set_type = rzg2l_irqc_set_type, + .flags = IRQCHIP_MASK_ON_SUSPEND | + IRQCHIP_SET_TYPE_MASKED | + IRQCHIP_SKIP_SET_WAKE, +}; + +static int rzg2l_irqc_alloc(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs, void *arg) +{ + struct rzg2l_irqc_priv *priv = domain->host_data; + unsigned long tint = 0; + irq_hw_number_t hwirq; + unsigned int type; + int ret; + + ret = irq_domain_translate_twocell(domain, arg, &hwirq, &type); + if (ret) + return ret; + + /* + * For TINT interrupts ie where pinctrl driver is child of irqc domain + * the hwirq and TINT are encoded in fwspec->param[0]. + * hwirq for TINT range from 9-40, hwirq is embedded 0-15 bits and TINT + * from 16-31 bits. TINT from the pinctrl driver needs to be programmed + * in IRQC registers to enable a given gpio pin as interrupt. + */ + if (hwirq > IRQC_IRQ_COUNT) { + tint = TINT_EXTRACT_GPIOINT(hwirq); + hwirq = TINT_EXTRACT_HWIRQ(hwirq); + + if (hwirq < IRQC_TINT_START) + return -EINVAL; + } + + if (hwirq > (IRQC_NUM_IRQ - 1)) + return -EINVAL; + + ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq, &irqc_chip, + (void *)(uintptr_t)tint); + if (ret) + return ret; + + return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &priv->fwspec[hwirq]); +} + +static const struct irq_domain_ops rzg2l_irqc_domain_ops = { + .alloc = rzg2l_irqc_alloc, + .free = irq_domain_free_irqs_common, + .translate = irq_domain_translate_twocell, +}; + +static int rzg2l_irqc_parse_interrupts(struct rzg2l_irqc_priv *priv, + struct device_node *np) +{ + struct of_phandle_args map; + unsigned int i; + int ret; + + for (i = 0; i < IRQC_NUM_IRQ; i++) { + ret = of_irq_parse_one(np, i, &map); + if (ret) + return ret; + of_phandle_args_to_fwspec(np, map.args, map.args_count, + &priv->fwspec[i]); + } + + return 0; +} + +static int rzg2l_irqc_init(struct device_node *node, struct device_node *parent) +{ + struct irq_domain *irq_domain, *parent_domain; + struct platform_device *pdev; + struct reset_control *resetn; + struct rzg2l_irqc_priv *priv; + int ret; + + pdev = of_find_device_by_node(node); + if (!pdev) + return -ENODEV; + + parent_domain = irq_find_host(parent); + if (!parent_domain) { + dev_err(&pdev->dev, "cannot find parent domain\n"); + return -ENODEV; + } + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->base = devm_of_iomap(&pdev->dev, pdev->dev.of_node, 0, NULL); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + ret = rzg2l_irqc_parse_interrupts(priv, node); + if (ret) { + dev_err(&pdev->dev, "cannot parse interrupts: %d\n", ret); + return ret; + } + + resetn = devm_reset_control_get_exclusive(&pdev->dev, NULL); + if (IS_ERR(resetn)) + return PTR_ERR(resetn); + + ret = reset_control_deassert(resetn); + if (ret) { + dev_err(&pdev->dev, "failed to deassert resetn pin, %d\n", ret); + return ret; + } + + pm_runtime_enable(&pdev->dev); + ret = pm_runtime_resume_and_get(&pdev->dev); + if (ret < 0) { + dev_err(&pdev->dev, "pm_runtime_resume_and_get failed: %d\n", ret); + goto pm_disable; + } + + raw_spin_lock_init(&priv->lock); + + irq_domain = irq_domain_add_hierarchy(parent_domain, 0, IRQC_NUM_IRQ, + node, &rzg2l_irqc_domain_ops, + priv); + if (!irq_domain) { + dev_err(&pdev->dev, "failed to add irq domain\n"); + ret = -ENOMEM; + goto pm_put; + } + + return 0; + +pm_put: + pm_runtime_put(&pdev->dev); +pm_disable: + pm_runtime_disable(&pdev->dev); + reset_control_assert(resetn); + return ret; +} + +IRQCHIP_PLATFORM_DRIVER_BEGIN(rzg2l_irqc) +IRQCHIP_MATCH("renesas,rzg2l-irqc", rzg2l_irqc_init) +IRQCHIP_PLATFORM_DRIVER_END(rzg2l_irqc) +MODULE_AUTHOR("Lad Prabhakar "); +MODULE_DESCRIPTION("Renesas RZ/G2L IRQC Driver"); +MODULE_LICENSE("GPL");