[MIPS] Sibyte: Split and move clock code.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 70 insertions, 0 deletions

diff --git a/arch/mips/kernel/csrc-sb1250.c b/arch/mips/kernel/csrc-sb1250.c
new file mode 100644
index 000000000000..ebb16e668877
--- /dev/null
+++ b/arch/mips/kernel/csrc-sb1250.c
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2000, 2001 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that 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.
+ */
+#include <linux/clocksource.h>
+
+#include <asm/addrspace.h>
+#include <asm/io.h>
+#include <asm/time.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 SB1250_HPT_NUM          3
+#define SB1250_HPT_VALUE        M_SCD_TIMER_CNT /* max value */
+
+/*
+ * 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;
+}
+
+struct clocksource bcm1250_clocksource = {
+        .name   = "MIPS",
+        .rating = 200,
+        .read   = sb1250_hpt_read,
+        .mask   = CLOCKSOURCE_MASK(23),
+        .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+void __init sb1250_clocksource_init(void)
+{
+        struct clocksource *cs = &bcm1250_clocksource;
+
+        /* 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)));
+
+        clocksource_set_clock(cs, V_SCD_TIMER_FREQ);
+        clocksource_register(cs);
+}