From cf908990d4a8ccdb73ee4484aa8cadad379ca314 Mon Sep 17 00:00:00 2001 From: Jonas Gorski Date: Sun, 30 Nov 2014 14:54:27 +0100 Subject: [PATCH] irqchip: add support for bcm6345-style external interrupt controller Signed-off-by: Jonas Gorski --- .../brcm,bcm6345-ext-intc.txt | 29 ++ drivers/irqchip/Kconfig | 4 + drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-bcm6345-ext.c | 280 ++++++++++++++++++ include/linux/irqchip/irq-bcm6345-ext.h | 14 + 5 files changed, 328 insertions(+) create mode 100644 Documentation/devicetree/bindings/interrupt-controller/brcm,bcm6345-ext-intc.txt create mode 100644 drivers/irqchip/irq-bcm6345-ext.c create mode 100644 include/linux/irqchip/irq-bcm6345-ext.h --- /dev/null +++ b/Documentation/devicetree/bindings/interrupt-controller/brcm,bcm6345-ext-intc.txt @@ -0,0 +1,29 @@ +Broadcom BCM6345-style external interrupt controller + +Required properties: + +- compatible: Should be "brcm,bcm6345-ext-intc" or "brcm,bcm6318-ext-intc". +- reg: Specifies the base physical addresses and size of the registers. +- interrupt-controller: identifies the node as an interrupt controller. +- #interrupt-cells: Specifies the number of cells needed to encode an interrupt + source, Should be 2. +- interrupt-parent: Specifies the phandle to the parent interrupt controller + this one is cascaded from. +- interrupts: Specifies the interrupt line(s) in the interrupt-parent controller + node, valid values depend on the type of parent interrupt controller. + +Optional properties: + +- brcm,field-width: Size of each field (mask, clear, sense, ...) in bits in the + register. Defaults to 4. + +Example: + +ext_intc: interrupt-controller@10000018 { + compatible = "brcm,bcm6345-ext-intc"; + interrupt-parent = <&periph_intc>; + #interrupt-cells = <2>; + reg = <0x10000018 0x4>; + interrupt-controller; + interrupts = <24>, <25>, <26>, <27>; +}; --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -108,6 +108,10 @@ config I8259 bool select IRQ_DOMAIN +config BCM6345_EXT_IRQ + bool "BCM6345 External IRQ Controller" + select IRQ_DOMAIN + config BCM6345_L1_IRQ bool select GENERIC_IRQ_CHIP --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -63,6 +63,7 @@ obj-$(CONFIG_XTENSA_MX) += irq-xtensa- obj-$(CONFIG_XILINX_INTC) += irq-xilinx-intc.o obj-$(CONFIG_IRQ_CROSSBAR) += irq-crossbar.o obj-$(CONFIG_SOC_VF610) += irq-vf610-mscm-ir.o +obj-$(CONFIG_BCM6345_EXT_IRQ) += irq-bcm6345-ext.o obj-$(CONFIG_BCM6345_L1_IRQ) += irq-bcm6345-l1.o obj-$(CONFIG_BCM7038_L1_IRQ) += irq-bcm7038-l1.o obj-$(CONFIG_BCM7120_L2_IRQ) += irq-bcm7120-l2.o --- /dev/null +++ b/drivers/irqchip/irq-bcm6345-ext.c @@ -0,0 +1,280 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2014 Jonas Gorski + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define MAX_IRQS 4 + +#define EXTIRQ_CFG_SENSE 0 +#define EXTIRQ_CFG_STAT 1 +#define EXTIRQ_CFG_CLEAR 2 +#define EXTIRQ_CFG_MASK 3 +#define EXTIRQ_CFG_BOTHEDGE 4 +#define EXTIRQ_CFG_LEVELSENSE 5 + +struct intc_data { + struct irq_chip chip; + struct irq_domain *domain; + raw_spinlock_t lock; + + int parent_irq[MAX_IRQS]; + void __iomem *reg; + int shift; + unsigned int toggle_clear_on_ack:1; +}; + +static void bcm6345_ext_intc_irq_handle(struct irq_desc *desc) +{ + struct intc_data *data = irq_desc_get_handler_data(desc); + struct irq_chip *chip = irq_desc_get_chip(desc); + unsigned int irq = irq_desc_get_irq(desc); + unsigned int idx; + + chained_irq_enter(chip, desc); + + for (idx = 0; idx < MAX_IRQS; idx++) { + if (data->parent_irq[idx] != irq) + continue; + + generic_handle_irq(irq_find_mapping(data->domain, idx)); + } + + chained_irq_exit(chip, desc); +} + +static void bcm6345_ext_intc_irq_ack(struct irq_data *data) +{ + struct intc_data *priv = data->domain->host_data; + irq_hw_number_t hwirq = irqd_to_hwirq(data); + u32 reg; + + raw_spin_lock(&priv->lock); + reg = __raw_readl(priv->reg); + __raw_writel(reg | (1 << (hwirq + EXTIRQ_CFG_CLEAR * priv->shift)), + priv->reg); + if (priv->toggle_clear_on_ack) + __raw_writel(reg, priv->reg); + raw_spin_unlock(&priv->lock); +} + +static void bcm6345_ext_intc_irq_mask(struct irq_data *data) +{ + struct intc_data *priv = data->domain->host_data; + irq_hw_number_t hwirq = irqd_to_hwirq(data); + u32 reg; + + raw_spin_lock(&priv->lock); + reg = __raw_readl(priv->reg); + reg &= ~(1 << (hwirq + EXTIRQ_CFG_MASK * priv->shift)); + __raw_writel(reg, priv->reg); + raw_spin_unlock(&priv->lock); +} + +static void bcm6345_ext_intc_irq_unmask(struct irq_data *data) +{ + struct intc_data *priv = data->domain->host_data; + irq_hw_number_t hwirq = irqd_to_hwirq(data); + u32 reg; + + raw_spin_lock(&priv->lock); + reg = __raw_readl(priv->reg); + reg |= 1 << (hwirq + EXTIRQ_CFG_MASK * priv->shift); + __raw_writel(reg, priv->reg); + raw_spin_unlock(&priv->lock); +} + +static int bcm6345_ext_intc_set_type(struct irq_data *data, + unsigned int flow_type) +{ + struct intc_data *priv = data->domain->host_data; + irq_hw_number_t hwirq = irqd_to_hwirq(data); + bool levelsense = 0, sense = 0, bothedge = 0; + u32 reg; + + flow_type &= IRQ_TYPE_SENSE_MASK; + + if (flow_type == IRQ_TYPE_NONE) + flow_type = IRQ_TYPE_LEVEL_LOW; + + switch (flow_type) { + case IRQ_TYPE_EDGE_BOTH: + bothedge = 1; + break; + + case IRQ_TYPE_EDGE_RISING: + sense = 1; + break; + + case IRQ_TYPE_EDGE_FALLING: + break; + + case IRQ_TYPE_LEVEL_HIGH: + levelsense = 1; + sense = 1; + break; + + case IRQ_TYPE_LEVEL_LOW: + levelsense = 1; + break; + + default: + pr_err("bogus flow type combination given!\n"); + return -EINVAL; + } + + raw_spin_lock(&priv->lock); + reg = __raw_readl(priv->reg); + + if (levelsense) + reg |= 1 << (hwirq + EXTIRQ_CFG_LEVELSENSE * priv->shift); + else + reg &= ~(1 << (hwirq + EXTIRQ_CFG_LEVELSENSE * priv->shift)); + if (sense) + reg |= 1 << (hwirq + EXTIRQ_CFG_SENSE * priv->shift); + else + reg &= ~(1 << (hwirq + EXTIRQ_CFG_SENSE * priv->shift)); + if (bothedge) + reg |= 1 << (hwirq + EXTIRQ_CFG_BOTHEDGE * priv->shift); + else + reg &= ~(1 << (hwirq + EXTIRQ_CFG_BOTHEDGE * priv->shift)); + + __raw_writel(reg, priv->reg); + raw_spin_unlock(&priv->lock); + + irqd_set_trigger_type(data, flow_type); + if (flow_type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH)) + irq_set_handler_locked(data, handle_level_irq); + else + irq_set_handler_locked(data, handle_edge_irq); + + return 0; +} + +static int bcm6345_ext_intc_map(struct irq_domain *d, unsigned int irq, + irq_hw_number_t hw) +{ + struct intc_data *priv = d->host_data; + + irq_set_chip_and_handler(irq, &priv->chip, handle_level_irq); + + return 0; +} + +static const struct irq_domain_ops bcm6345_ext_domain_ops = { + .xlate = irq_domain_xlate_twocell, + .map = bcm6345_ext_intc_map, +}; + +static int __init __bcm6345_ext_intc_init(struct device_node *node, + int num_irqs, int *irqs, + void __iomem *reg, int shift, + bool toggle_clear_on_ack) +{ + struct intc_data *data; + unsigned int i; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + raw_spin_lock_init(&data->lock); + + for (i = 0; i < num_irqs; i++) { + data->parent_irq[i] = irqs[i]; + + irq_set_handler_data(irqs[i], data); + irq_set_chained_handler(irqs[i], bcm6345_ext_intc_irq_handle); + } + + data->reg = reg; + data->shift = shift; + data->toggle_clear_on_ack = toggle_clear_on_ack; + + data->chip.name = "bcm6345-ext-intc"; + data->chip.irq_ack = bcm6345_ext_intc_irq_ack; + data->chip.irq_mask = bcm6345_ext_intc_irq_mask; + data->chip.irq_unmask = bcm6345_ext_intc_irq_unmask; + data->chip.irq_set_type = bcm6345_ext_intc_set_type; + + data->domain = irq_domain_add_linear(node, num_irqs, + &bcm6345_ext_domain_ops, data); + if (!data->domain) { + kfree(data); + return -ENOMEM; + } + + return 0; +} + +void __init bcm6345_ext_intc_init(int num_irqs, int *irqs, void __iomem *reg, + int shift) +{ + __bcm6345_ext_intc_init(NULL, num_irqs, irqs, reg, shift, false); +} + +#ifdef CONFIG_OF +static int __init bcm6345_ext_intc_of_init(struct device_node *node, + struct device_node *parent) +{ + int num_irqs, ret = -EINVAL; + unsigned i; + void __iomem *base; + int irqs[MAX_IRQS] = { 0 }; + u32 shift; + bool toggle_clear_on_ack = false; + + num_irqs = of_irq_count(node); + + if (!num_irqs || num_irqs > MAX_IRQS) + return -EINVAL; + + if (of_property_read_u32(node, "brcm,field-width", &shift)) + shift = 4; + + /* on BCM6318 setting CLEAR seems to continuously mask interrupts */ + if (of_device_is_compatible(node, "brcm,bcm6318-ext-intc")) + toggle_clear_on_ack = true; + + for (i = 0; i < num_irqs; i++) { + irqs[i] = irq_of_parse_and_map(node, i); + if (!irqs[i]) + return -ENOMEM; + } + + base = of_iomap(node, 0); + if (!base) + return -ENXIO; + + ret = __bcm6345_ext_intc_init(node, num_irqs, irqs, base, shift, + toggle_clear_on_ack); + if (!ret) + return 0; + + iounmap(base); + + for (i = 0; i < num_irqs; i++) + irq_dispose_mapping(irqs[i]); + + return ret; +} + +IRQCHIP_DECLARE(bcm6318_ext_intc, "brcm,bcm6318-ext-intc", + bcm6345_ext_intc_of_init); +IRQCHIP_DECLARE(bcm6345_ext_intc, "brcm,bcm6345-ext-intc", + bcm6345_ext_intc_of_init); +#endif --- /dev/null +++ b/include/linux/irqchip/irq-bcm6345-ext.h @@ -0,0 +1,14 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2014 Jonas Gorski + */ + +#ifndef __INCLUDE_LINUX_IRQCHIP_IRQ_BCM6345_EXT_H +#define __INCLUDE_LINUX_IRQCHIP_IRQ_BCM6345_EXT_H + +void bcm6345_ext_intc_init(int n_irqs, int *irqs, void __iomem *reg, int shift); + +#endif /* __INCLUDE_LINUX_IRQCHIP_IRQ_BCM6345_EXT_H */