diff options
Diffstat (limited to 'arch/arm/mach-dove/irq.c')
| -rw-r--r-- | arch/arm/mach-dove/irq.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/arch/arm/mach-dove/irq.c b/arch/arm/mach-dove/irq.c new file mode 100644 index 000000000000..61bfcb3b08c2 --- /dev/null +++ b/arch/arm/mach-dove/irq.c @@ -0,0 +1,133 @@ +/* + * arch/arm/mach-dove/irq.c + * + * Dove IRQ handling. + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/irq.h> +#include <linux/gpio.h> +#include <linux/io.h> +#include <asm/mach/arch.h> +#include <plat/irq.h> +#include <asm/mach/irq.h> +#include <mach/pm.h> +#include <mach/bridge-regs.h> +#include "common.h" + +static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc) +{ + int irqoff; + BUG_ON(irq < IRQ_DOVE_GPIO_0_7 || irq > IRQ_DOVE_HIGH_GPIO); + + irqoff = irq <= IRQ_DOVE_GPIO_16_23 ? irq - IRQ_DOVE_GPIO_0_7 : + 3 + irq - IRQ_DOVE_GPIO_24_31; + + orion_gpio_irq_handler(irqoff << 3); + if (irq == IRQ_DOVE_HIGH_GPIO) { + orion_gpio_irq_handler(40); + orion_gpio_irq_handler(48); + orion_gpio_irq_handler(56); + } +} + +static void pmu_irq_mask(unsigned int irq) +{ + int pin = irq_to_pmu(irq); + u32 u; + + u = readl(PMU_INTERRUPT_MASK); + u &= ~(1 << (pin & 31)); + writel(u, PMU_INTERRUPT_MASK); +} + +static void pmu_irq_unmask(unsigned int irq) +{ + int pin = irq_to_pmu(irq); + u32 u; + + u = readl(PMU_INTERRUPT_MASK); + u |= 1 << (pin & 31); + writel(u, PMU_INTERRUPT_MASK); +} + +static void pmu_irq_ack(unsigned int irq) +{ + int pin = irq_to_pmu(irq); + u32 u; + + u = ~(1 << (pin & 31)); + writel(u, PMU_INTERRUPT_CAUSE); +} + +static struct irq_chip pmu_irq_chip = { + .name = "pmu_irq", + .mask = pmu_irq_mask, + .unmask = pmu_irq_unmask, + .ack = pmu_irq_ack, +}; + +static void pmu_irq_handler(unsigned int irq, struct irq_desc *desc) +{ + unsigned long cause = readl(PMU_INTERRUPT_CAUSE); + + cause &= readl(PMU_INTERRUPT_MASK); + if (cause == 0) { + do_bad_IRQ(irq, desc); + return; + } + + for (irq = 0; irq < NR_PMU_IRQS; irq++) { + if (!(cause & (1 << irq))) + continue; + irq = pmu_to_irq(irq); + desc = irq_desc + irq; + desc_handle_irq(irq, desc); + } +} + +void __init dove_init_irq(void) +{ + int i; + + orion_irq_init(0, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF)); + orion_irq_init(32, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF)); + + /* + * Mask and clear GPIO IRQ interrupts. + */ + writel(0, GPIO_LEVEL_MASK(0)); + writel(0, GPIO_EDGE_MASK(0)); + writel(0, GPIO_EDGE_CAUSE(0)); + + /* + * Mask and clear PMU interrupts + */ + writel(0, PMU_INTERRUPT_MASK); + writel(0, PMU_INTERRUPT_CAUSE); + + for (i = IRQ_DOVE_GPIO_START; i < IRQ_DOVE_PMU_START; i++) { + set_irq_chip(i, &orion_gpio_irq_chip); + set_irq_handler(i, handle_level_irq); + irq_desc[i].status |= IRQ_LEVEL; + set_irq_flags(i, IRQF_VALID); + } + set_irq_chained_handler(IRQ_DOVE_GPIO_0_7, gpio_irq_handler); + set_irq_chained_handler(IRQ_DOVE_GPIO_8_15, gpio_irq_handler); + set_irq_chained_handler(IRQ_DOVE_GPIO_16_23, gpio_irq_handler); + set_irq_chained_handler(IRQ_DOVE_GPIO_24_31, gpio_irq_handler); + set_irq_chained_handler(IRQ_DOVE_HIGH_GPIO, gpio_irq_handler); + + for (i = IRQ_DOVE_PMU_START; i < NR_IRQS; i++) { + set_irq_chip(i, &pmu_irq_chip); + set_irq_handler(i, handle_level_irq); + irq_desc[i].status |= IRQ_LEVEL; + set_irq_flags(i, IRQF_VALID); + } + set_irq_chained_handler(IRQ_DOVE_PMU, pmu_irq_handler); +} |