diff options
Diffstat (limited to 'target/linux/adm5120/files-3.18/arch/mips/adm5120/common/irq.c')
| -rw-r--r-- | target/linux/adm5120/files-3.18/arch/mips/adm5120/common/irq.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/target/linux/adm5120/files-3.18/arch/mips/adm5120/common/irq.c b/target/linux/adm5120/files-3.18/arch/mips/adm5120/common/irq.c new file mode 100644 index 0000000..a26e651 --- /dev/null +++ b/target/linux/adm5120/files-3.18/arch/mips/adm5120/common/irq.c @@ -0,0 +1,171 @@ +/* + * ADM5120 specific interrupt handlers + * + * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + */ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/version.h> +#include <linux/irq.h> +#include <linux/interrupt.h> +#include <linux/ioport.h> +#include <linux/io.h> +#include <linux/bitops.h> + +#include <asm/irq_cpu.h> +#include <asm/mipsregs.h> + +#include <asm/mach-adm5120/adm5120_defs.h> + +static void adm5120_intc_irq_unmask(struct irq_data *d); +static void adm5120_intc_irq_mask(struct irq_data *d); +static int adm5120_intc_irq_set_type(struct irq_data *d, unsigned int flow_type); + +static inline void intc_write_reg(unsigned int reg, u32 val) +{ + void __iomem *base = (void __iomem *)KSEG1ADDR(ADM5120_INTC_BASE); + + __raw_writel(val, base + reg); +} + +static inline u32 intc_read_reg(unsigned int reg) +{ + void __iomem *base = (void __iomem *)KSEG1ADDR(ADM5120_INTC_BASE); + + return __raw_readl(base + reg); +} + +static struct irq_chip adm5120_intc_irq_chip = { + .name = "INTC", + .irq_unmask = adm5120_intc_irq_unmask, + .irq_mask = adm5120_intc_irq_mask, + .irq_mask_ack = adm5120_intc_irq_mask, + .irq_set_type = adm5120_intc_irq_set_type +}; + +static struct irqaction adm5120_intc_irq_action = { + .handler = no_action, + .name = "cascade [INTC]" +}; + +static void adm5120_intc_irq_unmask(struct irq_data *d) +{ + intc_write_reg(INTC_REG_IRQ_ENABLE, 1 << (d->irq - ADM5120_INTC_IRQ_BASE)); +} + +static void adm5120_intc_irq_mask(struct irq_data *d) +{ + intc_write_reg(INTC_REG_IRQ_DISABLE, 1 << (d->irq - ADM5120_INTC_IRQ_BASE)); +} + +static int adm5120_intc_irq_set_type(struct irq_data *d, unsigned int flow_type) +{ + unsigned int irq = d->irq; + unsigned int sense; + unsigned long mode; + int err = 0; + + sense = flow_type & (IRQ_TYPE_SENSE_MASK); + switch (sense) { + case IRQ_TYPE_NONE: + case IRQ_TYPE_LEVEL_HIGH: + break; + case IRQ_TYPE_LEVEL_LOW: + switch (irq) { + case ADM5120_IRQ_GPIO2: + case ADM5120_IRQ_GPIO4: + break; + default: + err = -EINVAL; + break; + } + break; + default: + err = -EINVAL; + break; + } + + if (err) + return err; + + switch (irq) { + case ADM5120_IRQ_GPIO2: + case ADM5120_IRQ_GPIO4: + mode = intc_read_reg(INTC_REG_INT_MODE); + if (sense == IRQ_TYPE_LEVEL_LOW) + mode |= (1 << (irq - ADM5120_INTC_IRQ_BASE)); + else + mode &= ~(1 << (irq - ADM5120_INTC_IRQ_BASE)); + + intc_write_reg(INTC_REG_INT_MODE, mode); + break; + } + + return 0; +} + +static void adm5120_intc_irq_dispatch(void) +{ + unsigned long status; + int irq; + + status = intc_read_reg(INTC_REG_IRQ_STATUS) & INTC_INT_ALL; + if (status) { + irq = ADM5120_INTC_IRQ_BASE + fls(status) - 1; + do_IRQ(irq); + } else + spurious_interrupt(); +} + +asmlinkage void plat_irq_dispatch(void) +{ + unsigned long pending; + + pending = read_c0_status() & read_c0_cause() & ST0_IM; + + if (pending & STATUSF_IP7) + do_IRQ(ADM5120_IRQ_COUNTER); + else if (pending & STATUSF_IP2) + adm5120_intc_irq_dispatch(); + else + spurious_interrupt(); +} + +#define INTC_IRQ_STATUS (IRQ_LEVEL | IRQ_TYPE_LEVEL_HIGH | IRQ_DISABLED) +static void __init adm5120_intc_irq_init(void) +{ + int i; + + /* disable all interrupts */ + intc_write_reg(INTC_REG_IRQ_DISABLE, INTC_INT_ALL); + + /* setup all interrupts to generate IRQ instead of FIQ */ + intc_write_reg(INTC_REG_INT_MODE, 0); + + /* set active level for all external interrupts to HIGH */ + intc_write_reg(INTC_REG_INT_LEVEL, 0); + + /* disable usage of the TEST_SOURCE register */ + intc_write_reg(INTC_REG_IRQ_SOURCE_SELECT, 0); + + for (i = ADM5120_INTC_IRQ_BASE; + i <= ADM5120_INTC_IRQ_BASE + INTC_IRQ_LAST; + i++) { + irq_set_chip_and_handler(i, &adm5120_intc_irq_chip, + handle_level_irq); + } + + setup_irq(ADM5120_IRQ_INTC, &adm5120_intc_irq_action); +} + +void __init arch_init_irq(void) +{ + mips_cpu_irq_init(); + adm5120_intc_irq_init(); +} |