* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
+#include <linux/init.h>
-/*
- * These are routines to set up and handle interrupts from the
- * bcm1480 general purpose timer 0. We're using the timer as a
- * system clock, so we set it up to run at 100 Hz. On every
- * interrupt, we update our idea of what the time of day is,
- * then call do_timer() in the architecture-independent kernel
- * code to do general bookkeeping (e.g. update jiffies, run
- * bottom halves, etc.)
- */
-#include <linux/clockchips.h>
-#include <linux/interrupt.h>
-#include <linux/percpu.h>
-#include <linux/spinlock.h>
-
-#include <asm/irq.h>
-#include <asm/addrspace.h>
-#include <asm/time.h>
-#include <asm/io.h>
-
-#include <asm/sibyte/bcm1480_regs.h>
-#include <asm/sibyte/sb1250_regs.h>
-#include <asm/sibyte/bcm1480_int.h>
-#include <asm/sibyte/bcm1480_scd.h>
-
-#include <asm/sibyte/sb1250.h>
-
-
-#define IMR_IP2_VAL K_BCM1480_INT_MAP_I0
-#define IMR_IP3_VAL K_BCM1480_INT_MAP_I1
-#define IMR_IP4_VAL K_BCM1480_INT_MAP_I2
-
-#ifdef CONFIG_SIMULATION
-#define BCM1480_HPT_VALUE 50000
-#else
-#define BCM1480_HPT_VALUE 1000000
-#endif
-
-extern int bcm1480_steal_irq(int irq);
+extern void sb1480_clockevent_init(void);
+extern void sb1480_clocksource_init(void);
void __init plat_time_init(void)
{
- unsigned int cpu = smp_processor_id();
- unsigned int irq = K_BCM1480_INT_TIMER_0 + cpu;
-
- BUG_ON(cpu > 3); /* Only have 4 general purpose timers */
-
- bcm1480_mask_irq(cpu, irq);
-
- /* Map the timer interrupt to ip[4] of this cpu */
- __raw_writeq(IMR_IP4_VAL, IOADDR(A_BCM1480_IMR_REGISTER(cpu, R_BCM1480_IMR_INTERRUPT_MAP_BASE_H)
- + (irq<<3)));
-
- bcm1480_unmask_irq(cpu, irq);
- bcm1480_steal_irq(irq);
-}
-
-/*
- * 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_INIT));
-
- 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 */
- case CLOCK_EVT_MODE_RESUME:
- ;
- }
-}
-
-static int sibyte_next_event(unsigned long delta, struct clock_event_device *cd)
-{
- unsigned int cpu = smp_processor_id();
- void __iomem *timer_init;
- unsigned int cnt;
- int res;
-
- timer_init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT));
- cnt = __raw_readq(timer_init);
- cnt += delta;
- __raw_writeq(cnt, timer_init);
- res = ((long)(__raw_readq(timer_init) - cnt ) > 0) ? -ETIME : 0;
-
- return res;
-}
-
-static DEFINE_PER_CPU(struct clock_event_device, sibyte_hpt_clockevent);
-
-static irqreturn_t sibyte_counter_handler(int irq, void *dev_id)
-{
- unsigned int cpu = smp_processor_id();
- struct clock_event_device *cd = &per_cpu(sibyte_hpt_clockevent, cpu);
-
- /* Reset the timer */
- __raw_writeq(M_SCD_TIMER_ENABLE | M_SCD_TIMER_MODE_CONTINUOUS,
- IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG)));
- cd->event_handler(cd);
-
- 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
- */
-void __cpuinit sb1480_clockevent_init(void)
-{
- unsigned int cpu = smp_processor_id();
- unsigned int irq = K_BCM1480_INT_TIMER_0 + cpu;
- struct clock_event_device *cd = &per_cpu(sibyte_hpt_clockevent, cpu);
-
- cd->name = "bcm1480-counter";
- cd->features = CLOCK_EVT_FEAT_PERIODIC |
- CLOCK_EVT_MODE_ONESHOT;
- cd->set_next_event = sibyte_next_event;
- cd->set_mode = sibyte_set_mode;
- cd->irq = irq;
- clockevent_set_clock(cd, BCM1480_HPT_VALUE);
-
- setup_irq(irq, &sibyte_counter_irqaction);
-}
-
-static cycle_t bcm1480_hpt_read(void)
-{
- /* We assume this function is called xtime_lock held. */
- unsigned long count =
- __raw_readq(IOADDR(A_SCD_TIMER_REGISTER(0, R_SCD_TIMER_CNT)));
- return (jiffies + 1) * (BCM1480_HPT_VALUE / HZ) - count;
-}
-
-struct clocksource bcm1480_clocksource = {
- .name = "MIPS",
- .rating = 200,
- .read = bcm1480_hpt_read,
- .mask = CLOCKSOURCE_MASK(32),
- .shift = 32,
- .flags = CLOCK_SOURCE_IS_CONTINUOUS,
-};
-
-void __init sb1480_clocksource_init(void)
-{
- struct clocksource *cs = &bcm1480_clocksource;
-
- clocksource_set_clock(cs, BCM1480_HPT_VALUE);
- clocksource_register(cs);
-}
-
-void __init bcm1480_hpt_setup(void)
-{
- mips_hpt_frequency = BCM1480_HPT_VALUE;
sb1480_clocksource_init();
sb1480_clockevent_init();
}
projects / ~andy / linux / blobdiff