1 files changed, 163 insertions, 0 deletions

diff --git a/arch/mips/mti-malta/malta-time.c b/arch/mips/mti-malta/malta-time.c
new file mode 100644
index 000000000000..0b97d47691fc
--- /dev/null
+++ b/arch/mips/mti-malta/malta-time.c
@@ -0,0 +1,163 @@
+/*
+ * Carsten Langgaard, carstenl@mips.com
+ * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
+ *
+ *  This program is free software; you can distribute it and/or modify it
+ *  under the terms of the GNU General Public License (Version 2) as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Setting up the clock on the MIPS boards.
+ */
+
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/kernel_stat.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/time.h>
+#include <linux/timex.h>
+#include <linux/mc146818rtc.h>
+
+#include <asm/mipsregs.h>
+#include <asm/mipsmtregs.h>
+#include <asm/hardirq.h>
+#include <asm/i8253.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>
+
+unsigned long cpu_khz;
+
+static int mips_cpu_timer_irq;
+static int mips_cpu_perf_irq;
+extern int cp0_perfcount_irq;
+
+static void mips_timer_dispatch(void)
+{
+        do_IRQ(mips_cpu_timer_irq);
+}
+
+static void mips_perf_dispatch(void)
+{
+        do_IRQ(mips_cpu_perf_irq);
+}
+
+/*
+ * Estimate CPU frequency.  Sets mips_hpt_frequency as a side-effect
+ */
+static unsigned int __init estimate_cpu_frequency(void)
+{
+        unsigned int prid = read_c0_prid() & 0xffff00;
+        unsigned int count;
+
+        unsigned long flags;
+        unsigned int start;
+
+        local_irq_save(flags);
+
+        /* Start counter exactly on falling edge of update flag */
+        while (CMOS_READ(RTC_REG_A) & RTC_UIP);
+        while (!(CMOS_READ(RTC_REG_A) & RTC_UIP));
+
+        /* Start r4k counter. */
+        start = read_c0_count();
+
+        /* Read counter exactly on falling edge of update flag */
+        while (CMOS_READ(RTC_REG_A) & RTC_UIP);
+        while (!(CMOS_READ(RTC_REG_A) & RTC_UIP));
+
+        count = read_c0_count() - start;
+
+        /* restore interrupts */
+        local_irq_restore(flags);
+
+        mips_hpt_frequency = count;
+        if ((prid != (PRID_COMP_MIPS | PRID_IMP_20KC)) &&
+            (prid != (PRID_COMP_MIPS | PRID_IMP_25KF)))
+                count *= 2;
+
+        count += 5000;    /* round */
+        count -= count%10000;
+
+        return count;
+}
+
+unsigned long read_persistent_clock(void)
+{
+        return mc146818_get_cmos_time();
+}
+
+static void __init plat_perf_setup(void)
+{
+#ifdef MSC01E_INT_BASE
+        if (cpu_has_veic) {
+                set_vi_handler(MSC01E_INT_PERFCTR, mips_perf_dispatch);
+                mips_cpu_perf_irq = MSC01E_INT_BASE + MSC01E_INT_PERFCTR;
+        } else
+#endif
+        if (cp0_perfcount_irq >= 0) {
+                if (cpu_has_vint)
+                        set_vi_handler(cp0_perfcount_irq, mips_perf_dispatch);
+                mips_cpu_perf_irq = MIPS_CPU_IRQ_BASE + cp0_perfcount_irq;
+#ifdef CONFIG_SMP
+                set_irq_handler(mips_cpu_perf_irq, handle_percpu_irq);
+#endif
+        }
+}
+
+unsigned int __cpuinit get_c0_compare_int(void)
+{
+#ifdef MSC01E_INT_BASE
+        if (cpu_has_veic) {
+                set_vi_handler(MSC01E_INT_CPUCTR, mips_timer_dispatch);
+                mips_cpu_timer_irq = MSC01E_INT_BASE + MSC01E_INT_CPUCTR;
+        } else
+#endif
+        {
+                if (cpu_has_vint)
+                        set_vi_handler(cp0_compare_irq, mips_timer_dispatch);
+                mips_cpu_timer_irq = MIPS_CPU_IRQ_BASE + cp0_compare_irq;
+        }
+
+        return mips_cpu_timer_irq;
+}
+
+void __init plat_time_init(void)
+{
+        unsigned int est_freq;
+
+        /* Set Data mode - binary. */
+        CMOS_WRITE(CMOS_READ(RTC_CONTROL) | RTC_DM_BINARY, RTC_CONTROL);
+
+        est_freq = estimate_cpu_frequency();
+
+        printk("CPU frequency %d.%02d MHz\n", est_freq/1000000,
+               (est_freq%1000000)*100/1000000);
+
+        cpu_khz = est_freq / 1000;
+
+        mips_scroll_message();
+#ifdef CONFIG_I8253             /* Only Malta has a PIT */
+        setup_pit_timer();
+#endif
+
+        plat_perf_setup();
+}