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MIPS: lantiq: add ipi handlers to make vsmp work

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Add IPI handlers to the interrupt code. This patch makes MIPS_MT_SMP work
on lantiq socs. The code is based on the malta implementation.

Signed-off-by: John Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3704/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
John Crispin 2012-04-30 11:33:05 +02:00 committed by Ralf Baechle
parent 59c1157984
commit a8d096ef78
2 changed files with 65 additions and 0 deletions
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60
arch/mips/lantiq/irq.c
View File

@ -54,6 +54,14 @@
#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 +227,47 @@ 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;
@ -312,6 +361,17 @@ void __init arch_init_irq(void)
irq_set_chip_and_handler(i, &ltq_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);

5
arch/mips/lantiq/prom.c
View File

@ -68,4 +68,9 @@ 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
}