From da466512e536083352dcefd9ddbfd95a9c60b464 Mon Sep 17 00:00:00 2001 From: John Crispin Date: Tue, 21 Feb 2012 21:09:01 +0100 Subject: [PATCH 36/73] MIPS: lantiq: add ipi handlers to make vsmp work Add IPI handlers to the interrupt code. This patch makes MIPS_MT_SMP work on lantiq SoCs. Signed-off-by: John Crispin --- arch/mips/lantiq/irq.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++ arch/mips/lantiq/prom.c | 5 ++++ 2 files changed, 66 insertions(+), 0 deletions(-) diff --git a/arch/mips/lantiq/irq.c b/arch/mips/lantiq/irq.c index 0b2ed87..770a10c 100644 --- a/arch/mips/lantiq/irq.c +++ b/arch/mips/lantiq/irq.c @@ -9,6 +9,7 @@ #include #include +#include #include #include @@ -54,6 +55,14 @@ #define ltq_eiu_w32(x, y) ltq_w32((x), ltq_eiu_membase + (y)) #define ltq_eiu_r32(x) ltq_r32(ltq_eiu_membase + (x)) +/* our 2 ipi interrupts for VSMP */ +#define MIPS_CPU_IPI_RESCHED_IRQ 0 +#define MIPS_CPU_IPI_CALL_IRQ 1 + +#if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_MIPS_MT_SMTC) +int gic_present; +#endif + static unsigned short ltq_eiu_irq[MAX_EIU] = { LTQ_EIU_IR0, LTQ_EIU_IR1, @@ -219,6 +228,47 @@ static void ltq_hw5_irqdispatch(void) do_IRQ(MIPS_CPU_TIMER_IRQ); } +#ifdef CONFIG_MIPS_MT_SMP +void __init arch_init_ipiirq(int irq, struct irqaction *action) +{ + setup_irq(irq, action); + irq_set_handler(irq, handle_percpu_irq); +} + +static void ltq_sw0_irqdispatch(void) +{ + do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ); +} + +static void ltq_sw1_irqdispatch(void) +{ + do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ); +} +static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id) +{ + scheduler_ipi(); + return IRQ_HANDLED; +} + +static irqreturn_t ipi_call_interrupt(int irq, void *dev_id) +{ + smp_call_function_interrupt(); + return IRQ_HANDLED; +} + +static struct irqaction irq_resched = { + .handler = ipi_resched_interrupt, + .flags = IRQF_PERCPU, + .name = "IPI_resched" +}; + +static struct irqaction irq_call = { + .handler = ipi_call_interrupt, + .flags = IRQF_PERCPU, + .name = "IPI_call" +}; +#endif + asmlinkage void plat_irq_dispatch(void) { unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM; @@ -314,6 +364,17 @@ void __init arch_init_irq(void) irq_set_chip_and_handler(i, <q_irq_type, handle_level_irq); +#if defined(CONFIG_MIPS_MT_SMP) + if (cpu_has_vint) { + pr_info("Setting up IPI vectored interrupts\n"); + set_vi_handler(MIPS_CPU_IPI_RESCHED_IRQ, ltq_sw0_irqdispatch); + set_vi_handler(MIPS_CPU_IPI_CALL_IRQ, ltq_sw1_irqdispatch); + } + arch_init_ipiirq(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ, + &irq_resched); + arch_init_ipiirq(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ, &irq_call); +#endif + #if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC) set_c0_status(IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5); diff --git a/arch/mips/lantiq/prom.c b/arch/mips/lantiq/prom.c index 971554b..00ad59c 100644 --- a/arch/mips/lantiq/prom.c +++ b/arch/mips/lantiq/prom.c @@ -108,4 +108,9 @@ void __init prom_init(void) soc_info.sys_type[LTQ_SYS_TYPE_LEN - 1] = '\0'; pr_info("SoC: %s\n", soc_info.sys_type); prom_init_cmdline(); + +#if defined(CONFIG_MIPS_MT_SMP) + if (register_vsmp_smp_ops()) + panic("failed to register_vsmp_smp_ops()"); +#endif } -- 1.7.9.1