* 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
- * sb1250 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/sched.h>
-#include <linux/spinlock.h>
-#include <linux/kernel_stat.h>
-
-#include <asm/irq.h>
-#include <asm/addrspace.h>
-#include <asm/time.h>
-#include <asm/io.h>
-
-#include <asm/sibyte/sb1250.h>
-#include <asm/sibyte/sb1250_regs.h>
-#include <asm/sibyte/sb1250_int.h>
-#include <asm/sibyte/sb1250_scd.h>
-
-
-#define IMR_IP2_VAL K_INT_MAP_I0
-#define IMR_IP3_VAL K_INT_MAP_I1
-#define IMR_IP4_VAL K_INT_MAP_I2
-
-#define SB1250_HPT_NUM 3
-#define SB1250_HPT_VALUE M_SCD_TIMER_CNT /* max value */
-
-
-extern int sb1250_steal_irq(int irq);
-
-static cycle_t sb1250_hpt_read(void);
-
-void __init sb1250_hpt_setup(void)
-{
- int cpu = smp_processor_id();
-
- if (!cpu) {
- /* Setup hpt using timer #3 but do not enable irq for it */
- __raw_writeq(0, IOADDR(A_SCD_TIMER_REGISTER(SB1250_HPT_NUM, R_SCD_TIMER_CFG)));
- __raw_writeq(SB1250_HPT_VALUE,
- IOADDR(A_SCD_TIMER_REGISTER(SB1250_HPT_NUM, R_SCD_TIMER_INIT)));
- __raw_writeq(M_SCD_TIMER_ENABLE | M_SCD_TIMER_MODE_CONTINUOUS,
- IOADDR(A_SCD_TIMER_REGISTER(SB1250_HPT_NUM, R_SCD_TIMER_CFG)));
-
- mips_hpt_frequency = V_SCD_TIMER_FREQ;
- clocksource_mips.read = sb1250_hpt_read;
- clocksource_mips.mask = M_SCD_TIMER_INIT;
- }
-}
-
-/*
- * 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((V_SCD_TIMER_FREQ / 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 */
- ;
- }
-}
-
-static int
-sibyte_next_event(unsigned long delta, 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));
-
- __raw_writeq(0, timer_cfg);
- __raw_writeq(delta, timer_init);
- __raw_writeq(M_SCD_TIMER_ENABLE, timer_cfg);
-
- return 0;
-}
-
-struct clock_event_device sibyte_hpt_clockevent = {
- .name = "sb1250-counter",
- .features = CLOCK_EVT_FEAT_PERIODIC,
- .set_mode = sibyte_set_mode,
- .set_next_event = sibyte_next_event,
- .shift = 32,
- .irq = 0,
-};
-
-static irqreturn_t sibyte_counter_handler(int irq, void *dev_id)
-{
- struct clock_event_device *cd = &sibyte_hpt_clockevent;
-
- cd->event_handler(cd);
-
- return IRQ_HANDLED;
-}
-
-static struct irqaction sibyte_irqaction = {
- .handler = sibyte_counter_handler,
- .flags = IRQF_DISABLED | IRQF_PERCPU,
- .name = "timer",
-};
-
-/*
- * 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((V_SCD_TIMER_FREQ / 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 */
- ;
- }
-}
-
-static int
-sibyte_next_event(unsigned long delta, 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));
-
- __raw_writeq(0, timer_cfg);
- __raw_writeq(delta, timer_init);
- __raw_writeq(M_SCD_TIMER_ENABLE, timer_cfg);
-
- return 0;
-}
-
-struct clock_event_device sibyte_hpt_clockevent = {
- .name = "sb1250-counter",
- .features = CLOCK_EVT_FEAT_PERIODIC,
- .set_mode = sibyte_set_mode,
- .set_next_event = sibyte_next_event,
- .shift = 32,
- .irq = 0,
-};
-
-static irqreturn_t sibyte_counter_handler(int irq, void *dev_id)
-{
- struct clock_event_device *cd = &sibyte_hpt_clockevent;
-
- cd->event_handler(cd);
-
- return IRQ_HANDLED;
-}
-
-static struct irqaction sibyte_irqaction = {
- .handler = sibyte_counter_handler,
- .flags = IRQF_DISABLED | IRQF_PERCPU,
- .name = "timer",
-};
-
-static void __init sb1250_clockevent_init(void)
-{
- struct clock_event_device *cd = &sibyte_hpt_clockevent;
- unsigned int cpu = smp_processor_id();
- int irq = K_INT_TIMER_0 + cpu;
-
- /* Only have 4 general purpose timers, and we use last one as hpt */
- BUG_ON(cpu > 2);
-
- sb1250_mask_irq(cpu, irq);
-
- /* Map the timer interrupt to ip[4] of this cpu */
- __raw_writeq(IMR_IP4_VAL,
- IOADDR(A_IMR_REGISTER(cpu, R_IMR_INTERRUPT_MAP_BASE) +
- (irq << 3)));
- cd->cpumask = cpumask_of_cpu(0);
-
- sb1250_unmask_irq(cpu, irq);
- sb1250_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. sb1250_timer_interrupt is
- * called directly from irq_handler.S when IP[4] is set during an
- * interrupt
- */
- setup_irq(irq, &sibyte_irqaction);
-
- clockevents_register_device(cd);
-}
+extern void sb1250_clocksource_init(void);
+extern void sb1250_clockevent_init(void);
void __init plat_time_init(void)
{
sb1250_clocksource_init();
sb1250_clockevent_init();
}
-
-/*
- * The HPT is free running from SB1250_HPT_VALUE down to 0 then starts over
- * again.
- */
-static cycle_t sb1250_hpt_read(void)
-{
- unsigned int count;
-
- count = G_SCD_TIMER_CNT(__raw_readq(IOADDR(A_SCD_TIMER_REGISTER(SB1250_HPT_NUM, R_SCD_TIMER_CNT))));
-
- return SB1250_HPT_VALUE - count;
-}
git.openpandora.org / pandora-kernel.git / blobdiff