diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/sibyte/bcm1480/time.c | 105 |
1 files changed, 80 insertions, 25 deletions
diff --git a/arch/mips/sibyte/bcm1480/time.c b/arch/mips/sibyte/bcm1480/time.c index 8519091d848b..40d7126cd5bf 100644 --- a/arch/mips/sibyte/bcm1480/time.c +++ b/arch/mips/sibyte/bcm1480/time.c @@ -25,6 +25,7 @@ * code to do general bookkeeping (e.g. update jiffies, run * bottom halves, etc.) */ +#include <linux/clockchips.h> #include <linux/interrupt.h> #include <linux/sched.h> #include <linux/spinlock.h> @@ -55,15 +56,12 @@ extern int bcm1480_steal_irq(int irq); -void bcm1480_time_init(void) +void __init plat_time_init(void) { - int cpu = smp_processor_id(); - int irq = K_BCM1480_INT_TIMER_0+cpu; + unsigned int cpu = smp_processor_id(); + unsigned int irq = K_BCM1480_INT_TIMER_0 + cpu; - /* Only have 4 general purpose timers */ - if (cpu > 3) { - BUG(); - } + BUG_ON(cpu > 3); /* Only have 4 general purpose timers */ bcm1480_mask_irq(cpu, irq); @@ -71,27 +69,83 @@ void bcm1480_time_init(void) __raw_writeq(IMR_IP4_VAL, IOADDR(A_BCM1480_IMR_REGISTER(cpu, R_BCM1480_IMR_INTERRUPT_MAP_BASE_H) + (irq<<3))); - /* the general purpose timer ticks at 1 Mhz independent of the rest of the system */ - /* Disable the timer and set up the count */ - __raw_writeq(0, IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG))); - __raw_writeq( - BCM1480_HPT_VALUE/HZ - , IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT))); + bcm1480_unmask_irq(cpu, irq); + bcm1480_steal_irq(irq); +} - /* Set the timer running */ +/* + * The general purpose timer ticks at 1 Mhz independent if + * the rest of the system + */ +static void sibyte_set_mode(enum clock_event_mode mode, + struct clock_event_device *evt) +{ + unsigned int cpu = smp_processor_id(); + void __iomem *timer_cfg, *timer_init; + + timer_cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG)); + timer_init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG)); + + switch (mode) { + case CLOCK_EVT_MODE_PERIODIC: + __raw_writeq(0, timer_cfg); + __raw_writeq(BCM1480_HPT_VALUE / HZ - 1, timer_init); + __raw_writeq(M_SCD_TIMER_ENABLE | M_SCD_TIMER_MODE_CONTINUOUS, + timer_cfg); + break; + + case CLOCK_EVT_MODE_ONESHOT: + /* Stop the timer until we actually program a shot */ + case CLOCK_EVT_MODE_SHUTDOWN: + __raw_writeq(0, timer_cfg); + break; + + case CLOCK_EVT_MODE_UNUSED: /* shuddup gcc */ + ; + } +} + +struct clock_event_device sibyte_hpt_clockevent = { + .name = "bcm1480-counter", + .features = CLOCK_EVT_FEAT_PERIODIC, + .set_mode = sibyte_set_mode, + .shift = 32, + .irq = 0, +}; + +static irqreturn_t sibyte_counter_handler(int irq, void *dev_id) +{ + struct clock_event_device *cd = &sibyte_hpt_clockevent; + unsigned int cpu = smp_processor_id(); + + /* Reset the timer */ __raw_writeq(M_SCD_TIMER_ENABLE|M_SCD_TIMER_MODE_CONTINUOUS, - IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG))); + IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG))); + cd->event_handler(cd); - bcm1480_unmask_irq(cpu, irq); - bcm1480_steal_irq(irq); - /* - * This interrupt is "special" in that it doesn't use the request_irq - * way to hook the irq line. The timer interrupt is initialized early - * enough to make this a major pain, and it's also firing enough to - * warrant a bit of special case code. bcm1480_timer_interrupt is - * called directly from irq_handler.S when IP[4] is set during an - * interrupt - */ + return IRQ_HANDLED; +} + +static struct irqaction sibyte_counter_irqaction = { + .handler = sibyte_counter_handler, + .flags = IRQF_DISABLED | IRQF_PERCPU, + .name = "timer", +}; + +/* + * This interrupt is "special" in that it doesn't use the request_irq + * way to hook the irq line. The timer interrupt is initialized early + * enough to make this a major pain, and it's also firing enough to + * warrant a bit of special case code. bcm1480_timer_interrupt is + * called directly from irq_handler.S when IP[4] is set during an + * interrupt + */ +static void __init sb1480_clockevent_init(void) +{ + unsigned int cpu = smp_processor_id(); + unsigned int irq = K_BCM1480_INT_TIMER_0 + cpu; + + setup_irq(irq, &sibyte_counter_irqaction); } void bcm1480_timer_interrupt(void) @@ -118,4 +172,5 @@ void __init bcm1480_hpt_setup(void) { clocksource_mips.read = bcm1480_hpt_read; mips_hpt_frequency = BCM1480_HPT_VALUE; + sb1480_clockevent_init(); } |