Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq

[sfrench/cifs-2.6.git] / arch / mips / mips-boards / generic / time.c

diff --git a/arch/mips/mips-boards/generic/time.c b/arch/mips/mips-boards/generic/time.c
index 16315444dd5acf489f04bbad6231cf0cc8d25201..72a12d931cbac1e7493a279fe542a01b828d8016 100644 (file)
--- a/arch/mips/mips-boards/generic/time.c
+++ b/arch/mips/mips-boards/generic/time.c
@@ -31,22 +31,21 @@
 
 #include <asm/mipsregs.h>
 #include <asm/ptrace.h>
+#include <asm/hardirq.h>
+#include <asm/irq.h>
 #include <asm/div64.h>
 #include <asm/cpu.h>
 #include <asm/time.h>
 #include <asm/mc146818-time.h>
+#include <asm/msc01_ic.h>
 
 #include <asm/mips-boards/generic.h>
 #include <asm/mips-boards/prom.h>
+#include <asm/mips-boards/maltaint.h>
+#include <asm/mc146818-time.h>
 
 unsigned long cpu_khz;
 
-#if defined(CONFIG_MIPS_SEAD)
-#define ALLINTS (IE_IRQ0 | IE_IRQ1 | IE_IRQ5)
-#else
-#define ALLINTS (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5)
-#endif
-
 #if defined(CONFIG_MIPS_ATLAS)
 static char display_string[] = "        LINUX ON ATLAS       ";
 #endif
@@ -59,20 +58,61 @@ static char display_string[] = "        LINUX ON SEAD       ";
 static unsigned int display_count = 0;
 #define MAX_DISPLAY_COUNT (sizeof(display_string) - 8)
 
-#define MIPS_CPU_TIMER_IRQ (NR_IRQS-1)
-
 static unsigned int timer_tick_count=0;
+static int mips_cpu_timer_irq;
 
-void mips_timer_interrupt(struct pt_regs *regs)
+static inline void scroll_display_message(void)
 {
        if ((timer_tick_count++ % HZ) == 0) {
                mips_display_message(&display_string[display_count++]);
                if (display_count == MAX_DISPLAY_COUNT)
-                       display_count = 0;
+                       display_count = 0;
+       }
+}
+
+static void mips_timer_dispatch (struct pt_regs *regs)
+{
+       do_IRQ (mips_cpu_timer_irq, regs);
+}
 
+irqreturn_t mips_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+#ifdef CONFIG_SMP
+       int cpu = smp_processor_id();
+
+       if (cpu == 0) {
+               /*
+                * CPU 0 handles the global timer interrupt job and process accounting
+                * resets count/compare registers to trigger next timer int.
+                */
+               (void) timer_interrupt(irq, dev_id, regs);
+               scroll_display_message();
+       }
+       else {
+               /* Everyone else needs to reset the timer int here as
+                  ll_local_timer_interrupt doesn't */
+               /*
+                * FIXME: need to cope with counter underflow.
+                * More support needs to be added to kernel/time for
+                * counter/timer interrupts on multiple CPU's
+                */
+               write_c0_compare (read_c0_count() + (mips_hpt_frequency/HZ));
+               /*
+                * other CPUs should do profiling and process accounting
+                */
+               local_timer_interrupt (irq, dev_id, regs);
        }
 
-       ll_timer_interrupt(MIPS_CPU_TIMER_IRQ, regs);
+       return IRQ_HANDLED;
+#else
+       irqreturn_t r;
+
+       r = timer_interrupt(irq, dev_id, regs);
+
+       scroll_display_message();
+
+       return r;
+#endif
 }
 
 /*
@@ -140,10 +180,8 @@ void __init mips_time_init(void)
 
        local_irq_save(flags);
 
-#if defined(CONFIG_MIPS_ATLAS) || defined(CONFIG_MIPS_MALTA)
         /* Set Data mode - binary. */
         CMOS_WRITE(CMOS_READ(RTC_CONTROL) | RTC_DM_BINARY, RTC_CONTROL);
-#endif
 
        est_freq = estimate_cpu_frequency ();
 
@@ -157,11 +195,29 @@ void __init mips_time_init(void)
 
 void __init mips_timer_setup(struct irqaction *irq)
 {
+       if (cpu_has_veic) {
+               set_vi_handler (MSC01E_INT_CPUCTR, mips_timer_dispatch);
+               mips_cpu_timer_irq = MSC01E_INT_BASE + MSC01E_INT_CPUCTR;
+       }
+       else {
+               if (cpu_has_vint)
+                       set_vi_handler (MIPSCPU_INT_CPUCTR, mips_timer_dispatch);
+               mips_cpu_timer_irq = MIPSCPU_INT_BASE + MIPSCPU_INT_CPUCTR;
+       }
+
+
        /* we are using the cpu counter for timer interrupts */
-       irq->handler = no_action;     /* we use our own handler */
-       setup_irq(MIPS_CPU_TIMER_IRQ, irq);
+       irq->handler = mips_timer_interrupt;    /* we use our own handler */
+       setup_irq(mips_cpu_timer_irq, irq);
+
+#ifdef CONFIG_SMP
+       /* irq_desc(riptor) is a global resource, when the interrupt overlaps
+          on seperate cpu's the first one tries to handle the second interrupt.
+          The effect is that the int remains disabled on the second cpu.
+          Mark the interrupt with IRQ_PER_CPU to avoid any confusion */
+       irq_desc[mips_cpu_timer_irq].status |= IRQ_PER_CPU;
+#endif
 
         /* to generate the first timer interrupt */
        write_c0_compare (read_c0_count() + mips_hpt_frequency/HZ);
-       set_c0_status(ALLINTS);
 }