Add a driver supporting the GPIO interrupt controller on certain Amlogic meson SoC's. Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx> --- drivers/irqchip/Kconfig | 3 + drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-meson-gpio.c | 280 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 284 insertions(+) create mode 100644 drivers/irqchip/irq-meson-gpio.c diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index 478f8ace..6bffe733 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -301,3 +301,6 @@ config QCOM_IRQ_COMBINER help Say yes here to add support for the IRQ combiner devices embedded in Qualcomm Technologies chips. + +config MESON_GPIO_INTC + bool diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index b64c59b8..1be482bd 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -76,3 +76,4 @@ obj-$(CONFIG_EZNPS_GIC) += irq-eznps.o obj-$(CONFIG_ARCH_ASPEED) += irq-aspeed-vic.o obj-$(CONFIG_STM32_EXTI) += irq-stm32-exti.o obj-$(CONFIG_QCOM_IRQ_COMBINER) += qcom-irq-combiner.o +obj-$(CONFIG_MESON_GPIO_INTC) += irq-meson-gpio.o diff --git a/drivers/irqchip/irq-meson-gpio.c b/drivers/irqchip/irq-meson-gpio.c new file mode 100644 index 00000000..acbbbdb0 --- /dev/null +++ b/drivers/irqchip/irq-meson-gpio.c @@ -0,0 +1,280 @@ +/* + * Amlogic Meson GPIO IRQ chip driver + * + * Copyright 2017 Heiner Kallweit <hkallweit1@xxxxxxxxx> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation, version 2. + */ + +#include <linux/device.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/irqchip.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> +#include <linux/regmap.h> + +#define REG_EDGE_POL 0x00 +#define REG_PIN_03_SEL 0x04 +#define REG_PIN_47_SEL 0x08 +#define REG_FILTER_SEL 0x0c + +#define REG_EDGE_POL_MASK(x) (BIT(x) | BIT(16 + (x))) +#define REG_EDGE_POL_EDGE(x) BIT(x) +#define REG_EDGE_POL_LOW(x) BIT(16 + (x)) + +#define MAX_PARENT_IRQ_NUM 8 + +struct meson_irq_slot { + unsigned int irq; + unsigned int owner; +}; + +struct meson_data { + struct regmap *regmap; + struct meson_irq_slot slots[MAX_PARENT_IRQ_NUM]; + unsigned int num_slots; + struct mutex lock; +}; + +static int meson_alloc_irq_slot(struct meson_data *md, unsigned int virq) +{ + int i, slot = -ENOSPC; + + mutex_lock(&md->lock); + + for (i = 0; i < md->num_slots && slot < 0; i++) + if (!md->slots[i].owner) { + md->slots[i].owner = virq; + slot = i; + } + + mutex_unlock(&md->lock); + + return slot; +} + +static void meson_free_irq_slot(struct meson_data *md, unsigned int virq) +{ + int i; + + mutex_lock(&md->lock); + + for (i = 0; i < md->num_slots; i++) + if (md->slots[i].owner == virq) { + md->slots[i].owner = 0; + break; + } + + mutex_unlock(&md->lock); +} + +static int meson_find_irq_slot(struct meson_data *md, unsigned int virq) +{ + int i, slot = -EINVAL; + + mutex_lock(&md->lock); + + for (i = 0; i < md->num_slots && slot < 0; i++) + if (md->slots[i].owner == virq) + slot = i; + + mutex_unlock(&md->lock); + + return slot; +} + +static void meson_set_hwirq(struct meson_data *md, int idx, unsigned int hwirq) +{ + int reg = idx > 3 ? REG_PIN_47_SEL : REG_PIN_03_SEL; + int shift = 8 * (idx % 4); + + regmap_update_bits(md->regmap, reg, 0xff << shift, + hwirq << shift); +} + +static void meson_irq_set_hwirq(struct irq_data *data, unsigned int hwirq) +{ + struct meson_data *md = data->domain->host_data; + int slot = meson_find_irq_slot(md, data->irq); + + if (slot >= 0) + meson_set_hwirq(md, slot, hwirq); +} + +static int meson_irq_set_type(struct irq_data *data, unsigned int type) +{ + struct meson_data *md = data->domain->host_data; + int slot; + unsigned int val = 0; + + if (type == IRQ_TYPE_EDGE_BOTH) + return -EINVAL; + + slot = meson_find_irq_slot(md, data->irq); + if (slot < 0) + return slot; + + if (type & IRQ_TYPE_EDGE_BOTH) + val |= REG_EDGE_POL_EDGE(slot); + + if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_EDGE_FALLING)) + val |= REG_EDGE_POL_LOW(slot); + + regmap_update_bits(md->regmap, REG_EDGE_POL, + REG_EDGE_POL_MASK(slot), val); + + if (type & IRQ_TYPE_EDGE_BOTH) + val = IRQ_TYPE_EDGE_RISING; + else + val = IRQ_TYPE_LEVEL_HIGH; + + return irq_chip_set_type_parent(data, val); +} + +static unsigned int meson_irq_startup(struct irq_data *data) +{ + irq_chip_unmask_parent(data); + /* + * An extra bit was added to allow having the same gpio hwirq twice + * for handling IRQ_TYPE_EDGE_BOTH. Remove this bit to get the + * gpio hwirq. + */ + meson_irq_set_hwirq(data, data->hwirq >> 1); + + return 0; +} + +static void meson_irq_shutdown(struct irq_data *data) +{ + meson_irq_set_hwirq(data, 0xff); + irq_chip_mask_parent(data); +} + +static struct irq_chip meson_irq_chip = { + .name = "meson_gpio_intc", + .irq_set_type = meson_irq_set_type, + .irq_eoi = irq_chip_eoi_parent, + .irq_mask = irq_chip_mask_parent, + .irq_unmask = irq_chip_unmask_parent, + .irq_startup = meson_irq_startup, + .irq_shutdown = meson_irq_shutdown, + .irq_set_affinity = irq_chip_set_affinity_parent, +}; + +static int meson_irq_alloc(struct irq_domain *d, unsigned int virq, + unsigned int nr_irqs, void *data) +{ + struct irq_fwspec parent_fwspec, *fwspec = data; + struct meson_data *md = d->host_data; + irq_hw_number_t hwirq; + int ret, slot; + + slot = meson_alloc_irq_slot(md, virq); + if (slot < 0) + return slot; + + hwirq = fwspec->param[0]; + irq_domain_set_hwirq_and_chip(d, virq, hwirq, &meson_irq_chip, NULL); + + parent_fwspec.fwnode = d->parent->fwnode; + parent_fwspec.param_count = 3; + parent_fwspec.param[0] = 0; /* SPI */ + parent_fwspec.param[1] = md->slots[slot].irq; + parent_fwspec.param[2] = IRQ_TYPE_NONE; + + ret = irq_domain_alloc_irqs_parent(d, virq, nr_irqs, &parent_fwspec); + if (ret) + meson_free_irq_slot(md, virq); + + return ret; +} + +static void meson_irq_free(struct irq_domain *d, unsigned int virq, + unsigned int nr_irqs) +{ + struct meson_data *md = d->host_data; + + irq_domain_free_irqs_common(d, virq, nr_irqs); + meson_free_irq_slot(md, virq); +} + +static const struct irq_domain_ops meson_irq_ops = { + .alloc = meson_irq_alloc, + .free = meson_irq_free, + .xlate = irq_domain_xlate_twocell, +}; + +static int meson_get_irqs(struct meson_data *md, struct device_node *node) +{ + int ret, i; + u32 irq; + + for (i = 0; i < MAX_PARENT_IRQ_NUM; i++) { + ret = of_property_read_u32_index(node, "parent-interrupts", i, + &irq); + if (ret) + break; + md->slots[i].irq = irq; + } + + md->num_slots = i; + + return i ? 0 : -EINVAL; +} + +static const struct regmap_config meson_regmap_config = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + .max_register = REG_FILTER_SEL, +}; + +static int __init meson_gpio_irq_init(struct device_node *node, + struct device_node *parent) +{ + struct irq_domain *meson_irq_domain, *parent_domain; + struct meson_data *md; + void __iomem *io_base; + int ret; + + md = kzalloc(sizeof(*md), GFP_KERNEL); + if (!md) + return -ENOMEM; + + mutex_init(&md->lock); + + io_base = of_iomap(node, 0); + if (!io_base) + return -EINVAL; + + md->regmap = regmap_init_mmio(NULL, io_base, &meson_regmap_config); + if (IS_ERR(md->regmap)) + return PTR_ERR(md->regmap); + + /* initialize to IRQ_TYPE_LEVEL_HIGH */ + regmap_write(md->regmap, REG_EDGE_POL, 0); + /* disable all GPIO interrupt sources */ + regmap_write(md->regmap, REG_PIN_03_SEL, 0xffffffff); + regmap_write(md->regmap, REG_PIN_47_SEL, 0xffffffff); + /* disable filtering */ + regmap_write(md->regmap, REG_FILTER_SEL, 0); + + ret = meson_get_irqs(md, node); + if (ret) + return ret; + + parent_domain = irq_find_host(parent); + if (!parent_domain) + return -ENXIO; + + meson_irq_domain = irq_domain_add_hierarchy(parent_domain, 0, 2 * 256, + node, &meson_irq_ops, md); + + return meson_irq_domain ? 0 : -EINVAL; +} + +IRQCHIP_DECLARE(meson_gpio_irq, "amlogic,meson-gpio-intc", meson_gpio_irq_init); -- 2.13.0 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html