diff options
Diffstat (limited to 'target/linux/ar71xx/files-2.6.39/arch/mips/ar71xx/irq.c')
| -rw-r--r-- | target/linux/ar71xx/files-2.6.39/arch/mips/ar71xx/irq.c | 416 |
1 files changed, 416 insertions, 0 deletions
diff --git a/target/linux/ar71xx/files-2.6.39/arch/mips/ar71xx/irq.c b/target/linux/ar71xx/files-2.6.39/arch/mips/ar71xx/irq.c new file mode 100644 index 0000000000..6d744daefa --- /dev/null +++ b/target/linux/ar71xx/files-2.6.39/arch/mips/ar71xx/irq.c @@ -0,0 +1,416 @@ +/* + * Atheros AR71xx SoC specific interrupt handling + * + * Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com> + * Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org> + * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org> + * + * Parts of this file are based on Atheros 2.6.15 BSP + * Parts of this file are based on Atheros 2.6.31 BSP + * + * 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/kernel.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/irq.h> + +#include <asm/irq_cpu.h> +#include <asm/mipsregs.h> + +#include <asm/mach-ar71xx/ar71xx.h> + +static void ar71xx_gpio_irq_dispatch(void) +{ + void __iomem *base = ar71xx_gpio_base; + u32 pending; + + pending = __raw_readl(base + AR71XX_GPIO_REG_INT_PENDING) & + __raw_readl(base + AR71XX_GPIO_REG_INT_ENABLE); + + if (pending) + do_IRQ(AR71XX_GPIO_IRQ_BASE + fls(pending) - 1); + else + spurious_interrupt(); +} + +static void ar71xx_gpio_irq_unmask(struct irq_data *d) +{ + unsigned int irq = d->irq - AR71XX_GPIO_IRQ_BASE; + void __iomem *base = ar71xx_gpio_base; + u32 t; + + t = __raw_readl(base + AR71XX_GPIO_REG_INT_ENABLE); + __raw_writel(t | (1 << irq), base + AR71XX_GPIO_REG_INT_ENABLE); + + /* flush write */ + (void) __raw_readl(base + AR71XX_GPIO_REG_INT_ENABLE); +} + +static void ar71xx_gpio_irq_mask(struct irq_data *d) +{ + unsigned int irq = d->irq - AR71XX_GPIO_IRQ_BASE; + void __iomem *base = ar71xx_gpio_base; + u32 t; + + t = __raw_readl(base + AR71XX_GPIO_REG_INT_ENABLE); + __raw_writel(t & ~(1 << irq), base + AR71XX_GPIO_REG_INT_ENABLE); + + /* flush write */ + (void) __raw_readl(base + AR71XX_GPIO_REG_INT_ENABLE); +} + +static struct irq_chip ar71xx_gpio_irq_chip = { + .name = "AR71XX GPIO", + .irq_unmask = ar71xx_gpio_irq_unmask, + .irq_mask = ar71xx_gpio_irq_mask, + .irq_mask_ack = ar71xx_gpio_irq_mask, +}; + +static struct irqaction ar71xx_gpio_irqaction = { + .handler = no_action, + .name = "cascade [AR71XX GPIO]", +}; + +#define GPIO_INT_ALL 0xffff + +static void __init ar71xx_gpio_irq_init(void) +{ + void __iomem *base = ar71xx_gpio_base; + int i; + + __raw_writel(0, base + AR71XX_GPIO_REG_INT_ENABLE); + __raw_writel(0, base + AR71XX_GPIO_REG_INT_PENDING); + + /* setup type of all GPIO interrupts to level sensitive */ + __raw_writel(GPIO_INT_ALL, base + AR71XX_GPIO_REG_INT_TYPE); + + /* setup polarity of all GPIO interrupts to active high */ + __raw_writel(GPIO_INT_ALL, base + AR71XX_GPIO_REG_INT_POLARITY); + + for (i = AR71XX_GPIO_IRQ_BASE; + i < AR71XX_GPIO_IRQ_BASE + AR71XX_GPIO_IRQ_COUNT; i++) + irq_set_chip_and_handler(i, &ar71xx_gpio_irq_chip, + handle_level_irq); + + setup_irq(AR71XX_MISC_IRQ_GPIO, &ar71xx_gpio_irqaction); +} + +static void ar71xx_misc_irq_dispatch(void) +{ + u32 pending; + + pending = ar71xx_reset_rr(AR71XX_RESET_REG_MISC_INT_STATUS) + & ar71xx_reset_rr(AR71XX_RESET_REG_MISC_INT_ENABLE); + + if (pending & MISC_INT_UART) + do_IRQ(AR71XX_MISC_IRQ_UART); + + else if (pending & MISC_INT_DMA) + do_IRQ(AR71XX_MISC_IRQ_DMA); + + else if (pending & MISC_INT_PERFC) + do_IRQ(AR71XX_MISC_IRQ_PERFC); + + else if (pending & MISC_INT_TIMER) + do_IRQ(AR71XX_MISC_IRQ_TIMER); + + else if (pending & MISC_INT_OHCI) + do_IRQ(AR71XX_MISC_IRQ_OHCI); + + else if (pending & MISC_INT_ERROR) + do_IRQ(AR71XX_MISC_IRQ_ERROR); + + else if (pending & MISC_INT_GPIO) + ar71xx_gpio_irq_dispatch(); + + else if (pending & MISC_INT_WDOG) + do_IRQ(AR71XX_MISC_IRQ_WDOG); + + else if (pending & MISC_INT_TIMER2) + do_IRQ(AR71XX_MISC_IRQ_TIMER2); + + else if (pending & MISC_INT_TIMER3) + do_IRQ(AR71XX_MISC_IRQ_TIMER3); + + else if (pending & MISC_INT_TIMER4) + do_IRQ(AR71XX_MISC_IRQ_TIMER4); + + else if (pending & MISC_INT_DDR_PERF) + do_IRQ(AR71XX_MISC_IRQ_DDR_PERF); + + else if (pending & MISC_INT_ENET_LINK) + do_IRQ(AR71XX_MISC_IRQ_ENET_LINK); + + else + spurious_interrupt(); +} + +static void ar71xx_misc_irq_unmask(struct irq_data *d) +{ + unsigned int irq = d->irq - AR71XX_MISC_IRQ_BASE; + void __iomem *base = ar71xx_reset_base; + u32 t; + + t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE); + __raw_writel(t | (1 << irq), base + AR71XX_RESET_REG_MISC_INT_ENABLE); + + /* flush write */ + (void) __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE); +} + +static void ar71xx_misc_irq_mask(struct irq_data *d) +{ + unsigned int irq = d->irq - AR71XX_MISC_IRQ_BASE; + void __iomem *base = ar71xx_reset_base; + u32 t; + + t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE); + __raw_writel(t & ~(1 << irq), base + AR71XX_RESET_REG_MISC_INT_ENABLE); + + /* flush write */ + (void) __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE); +} + +static void ar724x_misc_irq_ack(struct irq_data *d) +{ + unsigned int irq = d->irq - AR71XX_MISC_IRQ_BASE; + void __iomem *base = ar71xx_reset_base; + u32 t; + + t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS); + __raw_writel(t & ~(1 << irq), base + AR71XX_RESET_REG_MISC_INT_STATUS); + + /* flush write */ + (void) __raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS); +} + +static struct irq_chip ar71xx_misc_irq_chip = { + .name = "AR71XX MISC", + .irq_unmask = ar71xx_misc_irq_unmask, + .irq_mask = ar71xx_misc_irq_mask, +}; + +static struct irqaction ar71xx_misc_irqaction = { + .handler = no_action, + .name = "cascade [AR71XX MISC]", +}; + +static void __init ar71xx_misc_irq_init(void) +{ + void __iomem *base = ar71xx_reset_base; + int i; + + __raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_ENABLE); + __raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_STATUS); + + switch (ar71xx_soc) { + case AR71XX_SOC_AR7240: + case AR71XX_SOC_AR7241: + case AR71XX_SOC_AR7242: + case AR71XX_SOC_AR9330: + case AR71XX_SOC_AR9331: + case AR71XX_SOC_AR9341: + case AR71XX_SOC_AR9342: + case AR71XX_SOC_AR9344: + ar71xx_misc_irq_chip.irq_ack = ar724x_misc_irq_ack; + break; + default: + ar71xx_misc_irq_chip.irq_mask_ack = ar71xx_misc_irq_mask; + break; + } + + for (i = AR71XX_MISC_IRQ_BASE; + i < AR71XX_MISC_IRQ_BASE + AR71XX_MISC_IRQ_COUNT; i++) + irq_set_chip_and_handler(i, &ar71xx_misc_irq_chip, + handle_level_irq); + + setup_irq(AR71XX_CPU_IRQ_MISC, &ar71xx_misc_irqaction); +} + +static void ar934x_ip2_irq_dispatch(unsigned int irq, struct irq_desc *desc) +{ + u32 status; + + disable_irq_nosync(irq); + + status = ar71xx_reset_rr(AR934X_RESET_REG_PCIE_WMAC_INT_STATUS); + + if (status & AR934X_PCIE_WMAC_INT_PCIE_ALL) { + ar71xx_ddr_flush(AR934X_DDR_REG_FLUSH_PCIE); + generic_handle_irq(AR934X_IP2_IRQ_PCIE); + } else if (status & AR934X_PCIE_WMAC_INT_WMAC_ALL) { + ar71xx_ddr_flush(AR934X_DDR_REG_FLUSH_WMAC); + generic_handle_irq(AR934X_IP2_IRQ_WMAC); + } else { + spurious_interrupt(); + } + + enable_irq(irq); +} + +static void ar934x_ip2_irq_init(void) +{ + int i; + + for (i = AR934X_IP2_IRQ_BASE; + i < AR934X_IP2_IRQ_BASE + AR934X_IP2_IRQ_COUNT; i++) + irq_set_chip_and_handler(i, &dummy_irq_chip, + handle_level_irq); + + irq_set_chained_handler(AR71XX_CPU_IRQ_IP2, ar934x_ip2_irq_dispatch); +} + + +/* + * The IP2/IP3 lines are tied to a PCI/WMAC/USB device. Drivers for + * these devices typically allocate coherent DMA memory, however the + * DMA controller may still have some unsynchronized data in the FIFO. + * Issue a flush in the handlers to ensure that the driver sees + * the update. + */ +static void ar71xx_ip2_handler(void) +{ + ar71xx_ddr_flush(AR71XX_DDR_REG_FLUSH_PCI); + do_IRQ(AR71XX_CPU_IRQ_IP2); +} + +static void ar724x_ip2_handler(void) +{ + ar71xx_ddr_flush(AR724X_DDR_REG_FLUSH_PCIE); + do_IRQ(AR71XX_CPU_IRQ_IP2); +} + +static void ar913x_ip2_handler(void) +{ + ar71xx_ddr_flush(AR91XX_DDR_REG_FLUSH_WMAC); + do_IRQ(AR71XX_CPU_IRQ_IP2); +} + +static void ar933x_ip2_handler(void) +{ + ar71xx_ddr_flush(AR933X_DDR_REG_FLUSH_WMAC); + do_IRQ(AR71XX_CPU_IRQ_IP2); +} + +static void ar934x_ip2_handler(void) +{ + do_IRQ(AR71XX_CPU_IRQ_IP2); +} + +static void ar71xx_ip3_handler(void) +{ + ar71xx_ddr_flush(AR71XX_DDR_REG_FLUSH_USB); + do_IRQ(AR71XX_CPU_IRQ_USB); +} + +static void ar724x_ip3_handler(void) +{ + ar71xx_ddr_flush(AR724X_DDR_REG_FLUSH_USB); + do_IRQ(AR71XX_CPU_IRQ_USB); +} + +static void ar913x_ip3_handler(void) +{ + ar71xx_ddr_flush(AR91XX_DDR_REG_FLUSH_USB); + do_IRQ(AR71XX_CPU_IRQ_USB); +} + +static void ar933x_ip3_handler(void) +{ + ar71xx_ddr_flush(AR933X_DDR_REG_FLUSH_USB); + do_IRQ(AR71XX_CPU_IRQ_USB); +} + +static void ar934x_ip3_handler(void) +{ + do_IRQ(AR71XX_CPU_IRQ_USB); +} + +static void (*ip2_handler)(void); +static void (*ip3_handler)(void); + +asmlinkage void plat_irq_dispatch(void) +{ + unsigned long pending; + + pending = read_c0_status() & read_c0_cause() & ST0_IM; + + if (pending & STATUSF_IP7) + do_IRQ(AR71XX_CPU_IRQ_TIMER); + + else if (pending & STATUSF_IP2) + ip2_handler(); + + else if (pending & STATUSF_IP4) + do_IRQ(AR71XX_CPU_IRQ_GE0); + + else if (pending & STATUSF_IP5) + do_IRQ(AR71XX_CPU_IRQ_GE1); + + else if (pending & STATUSF_IP3) + ip3_handler(); + + else if (pending & STATUSF_IP6) + ar71xx_misc_irq_dispatch(); + + else + spurious_interrupt(); +} + +void __init arch_init_irq(void) +{ + switch (ar71xx_soc) { + case AR71XX_SOC_AR7130: + case AR71XX_SOC_AR7141: + case AR71XX_SOC_AR7161: + ip2_handler = ar71xx_ip2_handler; + ip3_handler = ar71xx_ip3_handler; + break; + + case AR71XX_SOC_AR7240: + case AR71XX_SOC_AR7241: + case AR71XX_SOC_AR7242: + ip2_handler = ar724x_ip2_handler; + ip3_handler = ar724x_ip3_handler; + break; + + case AR71XX_SOC_AR9130: + case AR71XX_SOC_AR9132: + ip2_handler = ar913x_ip2_handler; + ip3_handler = ar913x_ip3_handler; + break; + + case AR71XX_SOC_AR9330: + case AR71XX_SOC_AR9331: + ip2_handler = ar933x_ip2_handler; + ip3_handler = ar933x_ip3_handler; + break; + + case AR71XX_SOC_AR9341: + case AR71XX_SOC_AR9342: + case AR71XX_SOC_AR9344: + ip2_handler = ar934x_ip2_handler; + ip3_handler = ar934x_ip3_handler; + break; + + default: + BUG(); + } + + mips_cpu_irq_init(); + + ar71xx_misc_irq_init(); + + if (ar71xx_soc == AR71XX_SOC_AR9341 || + ar71xx_soc == AR71XX_SOC_AR9342 || + ar71xx_soc == AR71XX_SOC_AR9344) + ar934x_ip2_irq_init(); + + cp0_perfcount_irq = AR71XX_MISC_IRQ_PERFC; + + ar71xx_gpio_irq_init(); +} |