From 1753e74ed8fa3235174d5baa3421cbf8d693a42d Mon Sep 17 00:00:00 2001 From: Sergey Ryazanov Date: Wed, 29 Oct 2014 03:18:41 +0400 Subject: [PATCH] MIPS: ath25: add interrupts handling routines Add interrupts initialization and handling routines, also add AHB bus error interrupt handlers for both SoCs families. Signed-off-by: Sergey Ryazanov Cc: Linux MIPS Patchwork: https://patchwork.linux-mips.org/patch/8240/ Signed-off-by: Ralf Baechle --- arch/mips/Kconfig | 1 + arch/mips/ath25/ar2315.c | 114 ++++++++++++++++++++++++++++++++++ arch/mips/ath25/ar2315.h | 2 + arch/mips/ath25/ar2315_regs.h | 23 +++++++ arch/mips/ath25/ar5312.c | 112 +++++++++++++++++++++++++++++++++ arch/mips/ath25/ar5312.h | 2 + arch/mips/ath25/ar5312_regs.h | 23 +++++++ arch/mips/ath25/board.c | 9 +++ arch/mips/ath25/devices.h | 4 ++ 9 files changed, 290 insertions(+) diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 4b5a3b962ff4..656916810aae 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -103,6 +103,7 @@ config ATH25 select CSRC_R4K select DMA_NONCOHERENT select IRQ_CPU + select IRQ_DOMAIN select SYS_HAS_CPU_MIPS32_R1 select SYS_SUPPORTS_BIG_ENDIAN select SYS_SUPPORTS_32BIT_KERNEL diff --git a/arch/mips/ath25/ar2315.c b/arch/mips/ath25/ar2315.c index 828943212f03..d92aa91ae75d 100644 --- a/arch/mips/ath25/ar2315.c +++ b/arch/mips/ath25/ar2315.c @@ -16,6 +16,9 @@ #include #include +#include +#include +#include #include #include #include @@ -26,6 +29,7 @@ #include "ar2315_regs.h" static void __iomem *ar2315_rst_base; +static struct irq_domain *ar2315_misc_irq_domain; static inline u32 ar2315_rst_reg_read(u32 reg) { @@ -46,6 +50,116 @@ static inline void ar2315_rst_reg_mask(u32 reg, u32 mask, u32 val) ar2315_rst_reg_write(reg, ret); } +static irqreturn_t ar2315_ahb_err_handler(int cpl, void *dev_id) +{ + ar2315_rst_reg_write(AR2315_AHB_ERR0, AR2315_AHB_ERROR_DET); + ar2315_rst_reg_read(AR2315_AHB_ERR1); + + pr_emerg("AHB fatal error\n"); + machine_restart("AHB error"); /* Catastrophic failure */ + + return IRQ_HANDLED; +} + +static struct irqaction ar2315_ahb_err_interrupt = { + .handler = ar2315_ahb_err_handler, + .name = "ar2315-ahb-error", +}; + +static void ar2315_misc_irq_handler(unsigned irq, struct irq_desc *desc) +{ + u32 pending = ar2315_rst_reg_read(AR2315_ISR) & + ar2315_rst_reg_read(AR2315_IMR); + unsigned nr, misc_irq = 0; + + if (pending) { + struct irq_domain *domain = irq_get_handler_data(irq); + + nr = __ffs(pending); + misc_irq = irq_find_mapping(domain, nr); + } + + if (misc_irq) { + if (nr == AR2315_MISC_IRQ_GPIO) + ar2315_rst_reg_write(AR2315_ISR, AR2315_ISR_GPIO); + else if (nr == AR2315_MISC_IRQ_WATCHDOG) + ar2315_rst_reg_write(AR2315_ISR, AR2315_ISR_WD); + generic_handle_irq(misc_irq); + } else { + spurious_interrupt(); + } +} + +static void ar2315_misc_irq_unmask(struct irq_data *d) +{ + ar2315_rst_reg_mask(AR2315_IMR, 0, BIT(d->hwirq)); +} + +static void ar2315_misc_irq_mask(struct irq_data *d) +{ + ar2315_rst_reg_mask(AR2315_IMR, BIT(d->hwirq), 0); +} + +static struct irq_chip ar2315_misc_irq_chip = { + .name = "ar2315-misc", + .irq_unmask = ar2315_misc_irq_unmask, + .irq_mask = ar2315_misc_irq_mask, +}; + +static int ar2315_misc_irq_map(struct irq_domain *d, unsigned irq, + irq_hw_number_t hw) +{ + irq_set_chip_and_handler(irq, &ar2315_misc_irq_chip, handle_level_irq); + return 0; +} + +static struct irq_domain_ops ar2315_misc_irq_domain_ops = { + .map = ar2315_misc_irq_map, +}; + +/* + * Called when an interrupt is received, this function + * determines exactly which interrupt it was, and it + * invokes the appropriate handler. + * + * Implicitly, we also define interrupt priority by + * choosing which to dispatch first. + */ +static void ar2315_irq_dispatch(void) +{ + u32 pending = read_c0_status() & read_c0_cause(); + + if (pending & CAUSEF_IP3) + do_IRQ(AR2315_IRQ_WLAN0); + else if (pending & CAUSEF_IP2) + do_IRQ(AR2315_IRQ_MISC); + else if (pending & CAUSEF_IP7) + do_IRQ(ATH25_IRQ_CPU_CLOCK); + else + spurious_interrupt(); +} + +void __init ar2315_arch_init_irq(void) +{ + struct irq_domain *domain; + unsigned irq; + + ath25_irq_dispatch = ar2315_irq_dispatch; + + domain = irq_domain_add_linear(NULL, AR2315_MISC_IRQ_COUNT, + &ar2315_misc_irq_domain_ops, NULL); + if (!domain) + panic("Failed to add IRQ domain"); + + irq = irq_create_mapping(domain, AR2315_MISC_IRQ_AHB); + setup_irq(irq, &ar2315_ahb_err_interrupt); + + irq_set_chained_handler(AR2315_IRQ_MISC, ar2315_misc_irq_handler); + irq_set_handler_data(AR2315_IRQ_MISC, domain); + + ar2315_misc_irq_domain = domain; +} + static void ar2315_restart(char *command) { void (*mips_reset_vec)(void) = (void *)0xbfc00000; diff --git a/arch/mips/ath25/ar2315.h b/arch/mips/ath25/ar2315.h index baeaf847223a..da5b843dd3a6 100644 --- a/arch/mips/ath25/ar2315.h +++ b/arch/mips/ath25/ar2315.h @@ -3,11 +3,13 @@ #ifdef CONFIG_SOC_AR2315 +void ar2315_arch_init_irq(void); void ar2315_plat_time_init(void); void ar2315_plat_mem_setup(void); #else +static inline void ar2315_arch_init_irq(void) {} static inline void ar2315_plat_time_init(void) {} static inline void ar2315_plat_mem_setup(void) {} diff --git a/arch/mips/ath25/ar2315_regs.h b/arch/mips/ath25/ar2315_regs.h index c97d35127a5d..16e86149cb74 100644 --- a/arch/mips/ath25/ar2315_regs.h +++ b/arch/mips/ath25/ar2315_regs.h @@ -14,6 +14,29 @@ #ifndef __ASM_MACH_ATH25_AR2315_REGS_H #define __ASM_MACH_ATH25_AR2315_REGS_H +/* + * IRQs + */ +#define AR2315_IRQ_MISC (MIPS_CPU_IRQ_BASE + 2) /* C0_CAUSE: 0x0400 */ +#define AR2315_IRQ_WLAN0 (MIPS_CPU_IRQ_BASE + 3) /* C0_CAUSE: 0x0800 */ +#define AR2315_IRQ_ENET0 (MIPS_CPU_IRQ_BASE + 4) /* C0_CAUSE: 0x1000 */ +#define AR2315_IRQ_LCBUS_PCI (MIPS_CPU_IRQ_BASE + 5) /* C0_CAUSE: 0x2000 */ +#define AR2315_IRQ_WLAN0_POLL (MIPS_CPU_IRQ_BASE + 6) /* C0_CAUSE: 0x4000 */ + +/* + * Miscellaneous interrupts, which share IP2. + */ +#define AR2315_MISC_IRQ_UART0 0 +#define AR2315_MISC_IRQ_I2C_RSVD 1 +#define AR2315_MISC_IRQ_SPI 2 +#define AR2315_MISC_IRQ_AHB 3 +#define AR2315_MISC_IRQ_APB 4 +#define AR2315_MISC_IRQ_TIMER 5 +#define AR2315_MISC_IRQ_GPIO 6 +#define AR2315_MISC_IRQ_WATCHDOG 7 +#define AR2315_MISC_IRQ_IR_RSVD 8 +#define AR2315_MISC_IRQ_COUNT 9 + /* * Address map */ diff --git a/arch/mips/ath25/ar5312.c b/arch/mips/ath25/ar5312.c index c2adaf2cd73a..b99a02a9e20e 100644 --- a/arch/mips/ath25/ar5312.c +++ b/arch/mips/ath25/ar5312.c @@ -16,6 +16,9 @@ #include #include +#include +#include +#include #include #include #include @@ -26,6 +29,7 @@ #include "ar5312_regs.h" static void __iomem *ar5312_rst_base; +static struct irq_domain *ar5312_misc_irq_domain; static inline u32 ar5312_rst_reg_read(u32 reg) { @@ -46,6 +50,114 @@ static inline void ar5312_rst_reg_mask(u32 reg, u32 mask, u32 val) ar5312_rst_reg_write(reg, ret); } +static irqreturn_t ar5312_ahb_err_handler(int cpl, void *dev_id) +{ + u32 proc1 = ar5312_rst_reg_read(AR5312_PROC1); + u32 proc_addr = ar5312_rst_reg_read(AR5312_PROCADDR); /* clears error */ + u32 dma1 = ar5312_rst_reg_read(AR5312_DMA1); + u32 dma_addr = ar5312_rst_reg_read(AR5312_DMAADDR); /* clears error */ + + pr_emerg("AHB interrupt: PROCADDR=0x%8.8x PROC1=0x%8.8x DMAADDR=0x%8.8x DMA1=0x%8.8x\n", + proc_addr, proc1, dma_addr, dma1); + + machine_restart("AHB error"); /* Catastrophic failure */ + return IRQ_HANDLED; +} + +static struct irqaction ar5312_ahb_err_interrupt = { + .handler = ar5312_ahb_err_handler, + .name = "ar5312-ahb-error", +}; + +static void ar5312_misc_irq_handler(unsigned irq, struct irq_desc *desc) +{ + u32 pending = ar5312_rst_reg_read(AR5312_ISR) & + ar5312_rst_reg_read(AR5312_IMR); + unsigned nr, misc_irq = 0; + + if (pending) { + struct irq_domain *domain = irq_get_handler_data(irq); + + nr = __ffs(pending); + misc_irq = irq_find_mapping(domain, nr); + } + + if (misc_irq) { + generic_handle_irq(misc_irq); + if (nr == AR5312_MISC_IRQ_TIMER) + ar5312_rst_reg_read(AR5312_TIMER); + } else { + spurious_interrupt(); + } +} + +/* Enable the specified AR5312_MISC_IRQ interrupt */ +static void ar5312_misc_irq_unmask(struct irq_data *d) +{ + ar5312_rst_reg_mask(AR5312_IMR, 0, BIT(d->hwirq)); +} + +/* Disable the specified AR5312_MISC_IRQ interrupt */ +static void ar5312_misc_irq_mask(struct irq_data *d) +{ + ar5312_rst_reg_mask(AR5312_IMR, BIT(d->hwirq), 0); + ar5312_rst_reg_read(AR5312_IMR); /* flush write buffer */ +} + +static struct irq_chip ar5312_misc_irq_chip = { + .name = "ar5312-misc", + .irq_unmask = ar5312_misc_irq_unmask, + .irq_mask = ar5312_misc_irq_mask, +}; + +static int ar5312_misc_irq_map(struct irq_domain *d, unsigned irq, + irq_hw_number_t hw) +{ + irq_set_chip_and_handler(irq, &ar5312_misc_irq_chip, handle_level_irq); + return 0; +} + +static struct irq_domain_ops ar5312_misc_irq_domain_ops = { + .map = ar5312_misc_irq_map, +}; + +static void ar5312_irq_dispatch(void) +{ + u32 pending = read_c0_status() & read_c0_cause(); + + if (pending & CAUSEF_IP2) + do_IRQ(AR5312_IRQ_WLAN0); + else if (pending & CAUSEF_IP5) + do_IRQ(AR5312_IRQ_WLAN1); + else if (pending & CAUSEF_IP6) + do_IRQ(AR5312_IRQ_MISC); + else if (pending & CAUSEF_IP7) + do_IRQ(ATH25_IRQ_CPU_CLOCK); + else + spurious_interrupt(); +} + +void __init ar5312_arch_init_irq(void) +{ + struct irq_domain *domain; + unsigned irq; + + ath25_irq_dispatch = ar5312_irq_dispatch; + + domain = irq_domain_add_linear(NULL, AR5312_MISC_IRQ_COUNT, + &ar5312_misc_irq_domain_ops, NULL); + if (!domain) + panic("Failed to add IRQ domain"); + + irq = irq_create_mapping(domain, AR5312_MISC_IRQ_AHB_PROC); + setup_irq(irq, &ar5312_ahb_err_interrupt); + + irq_set_chained_handler(AR5312_IRQ_MISC, ar5312_misc_irq_handler); + irq_set_handler_data(AR5312_IRQ_MISC, domain); + + ar5312_misc_irq_domain = domain; +} + static void ar5312_restart(char *command) { /* reset the system */ diff --git a/arch/mips/ath25/ar5312.h b/arch/mips/ath25/ar5312.h index 9e1e56e24eed..254f04f371b5 100644 --- a/arch/mips/ath25/ar5312.h +++ b/arch/mips/ath25/ar5312.h @@ -3,11 +3,13 @@ #ifdef CONFIG_SOC_AR5312 +void ar5312_arch_init_irq(void); void ar5312_plat_time_init(void); void ar5312_plat_mem_setup(void); #else +static inline void ar5312_arch_init_irq(void) {} static inline void ar5312_plat_time_init(void) {} static inline void ar5312_plat_mem_setup(void) {} diff --git a/arch/mips/ath25/ar5312_regs.h b/arch/mips/ath25/ar5312_regs.h index ff1201119be0..4b947f967439 100644 --- a/arch/mips/ath25/ar5312_regs.h +++ b/arch/mips/ath25/ar5312_regs.h @@ -11,6 +11,29 @@ #ifndef __ASM_MACH_ATH25_AR5312_REGS_H #define __ASM_MACH_ATH25_AR5312_REGS_H +/* + * IRQs + */ +#define AR5312_IRQ_WLAN0 (MIPS_CPU_IRQ_BASE + 2) /* C0_CAUSE: 0x0400 */ +#define AR5312_IRQ_ENET0 (MIPS_CPU_IRQ_BASE + 3) /* C0_CAUSE: 0x0800 */ +#define AR5312_IRQ_ENET1 (MIPS_CPU_IRQ_BASE + 4) /* C0_CAUSE: 0x1000 */ +#define AR5312_IRQ_WLAN1 (MIPS_CPU_IRQ_BASE + 5) /* C0_CAUSE: 0x2000 */ +#define AR5312_IRQ_MISC (MIPS_CPU_IRQ_BASE + 6) /* C0_CAUSE: 0x4000 */ + +/* + * Miscellaneous interrupts, which share IP6. + */ +#define AR5312_MISC_IRQ_TIMER 0 +#define AR5312_MISC_IRQ_AHB_PROC 1 +#define AR5312_MISC_IRQ_AHB_DMA 2 +#define AR5312_MISC_IRQ_GPIO 3 +#define AR5312_MISC_IRQ_UART0 4 +#define AR5312_MISC_IRQ_UART0_DMA 5 +#define AR5312_MISC_IRQ_WATCHDOG 6 +#define AR5312_MISC_IRQ_LOCAL 7 +#define AR5312_MISC_IRQ_SPI 8 +#define AR5312_MISC_IRQ_COUNT 9 + /* * Address Map * diff --git a/arch/mips/ath25/board.c b/arch/mips/ath25/board.c index 6063bdf9066e..d4675e04a634 100644 --- a/arch/mips/ath25/board.c +++ b/arch/mips/ath25/board.c @@ -20,6 +20,8 @@ #include "ar5312.h" #include "ar2315.h" +void (*ath25_irq_dispatch)(void); + static void ath25_halt(void) { local_irq_disable(); @@ -42,6 +44,7 @@ void __init plat_mem_setup(void) asmlinkage void plat_irq_dispatch(void) { + ath25_irq_dispatch(); } void __init plat_time_init(void) @@ -61,4 +64,10 @@ void __init arch_init_irq(void) { clear_c0_status(ST0_IM); mips_cpu_irq_init(); + + /* Initialize interrupt controllers */ + if (is_ar5312()) + ar5312_arch_init_irq(); + else + ar2315_arch_init_irq(); } diff --git a/arch/mips/ath25/devices.h b/arch/mips/ath25/devices.h index e25a3262256d..2985586a0f2c 100644 --- a/arch/mips/ath25/devices.h +++ b/arch/mips/ath25/devices.h @@ -5,6 +5,10 @@ #define ATH25_REG_MS(_val, _field) (((_val) & _field##_M) >> _field##_S) +#define ATH25_IRQ_CPU_CLOCK (MIPS_CPU_IRQ_BASE + 7) /* C0_CAUSE: 0x8000 */ + +extern void (*ath25_irq_dispatch)(void); + static inline bool is_ar2315(void) { return (current_cpu_data.cputype == CPU_4KEC); -- 2.39.5