1 files changed, 67 insertions, 0 deletions

diff --git a/arch/mips/rb532/time.c b/arch/mips/rb532/time.c
new file mode 100644
index 000000000000..db74edf8cefb
--- /dev/null
+++ b/arch/mips/rb532/time.c
@@ -0,0 +1,67 @@
+/*
+ * 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/init.h>
+#include <linux/kernel_stat.h>
+#include <linux/ptrace.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/mc146818rtc.h>
+#include <linux/irq.h>
+#include <linux/timex.h>
+
+#include <asm/mipsregs.h>
+#include <asm/debug.h>
+#include <asm/time.h>
+#include <asm/mach-rc32434/rc32434.h>
+
+extern unsigned int idt_cpu_freq;
+
+/*
+ * Figure out the r4k offset, the amount to increment the compare
+ * register for each time tick. There is no RTC available.
+ *
+ * The RC32434 counts at half the CPU *core* speed.
+ */
+static unsigned long __init cal_r4koff(void)
+{
+        mips_hpt_frequency = idt_cpu_freq * IDT_CLOCK_MULT / 2;
+
+        return mips_hpt_frequency / HZ;
+}
+
+void __init plat_time_init(void)
+{
+        unsigned int est_freq, flags;
+        unsigned long r4k_offset;
+
+        local_irq_save(flags);
+
+        printk(KERN_INFO "calculating r4koff... ");
+        r4k_offset = cal_r4koff();
+        printk("%08lx(%d)\n", r4k_offset, (int) r4k_offset);
+
+        est_freq = 2 * r4k_offset * HZ;
+        est_freq += 5000;       /* round */
+        est_freq -= est_freq % 10000;
+        printk(KERN_INFO "CPU frequency %d.%02d MHz\n", est_freq / 1000000,
+               (est_freq % 1000000) * 100 / 1000000);
+        local_irq_restore(flags);
+}