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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/m68k/hp300/time.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/m68k/hp300/time.c')
-rw-r--r--kernel/arch/m68k/hp300/time.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/kernel/arch/m68k/hp300/time.c b/kernel/arch/m68k/hp300/time.c
new file mode 100644
index 000000000..749543b42
--- /dev/null
+++ b/kernel/arch/m68k/hp300/time.c
@@ -0,0 +1,77 @@
+/*
+ * linux/arch/m68k/hp300/time.c
+ *
+ * Copyright (C) 1998 Philip Blundell <philb@gnu.org>
+ *
+ * This file contains the HP300-specific time handling code.
+ */
+
+#include <asm/ptrace.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/kernel_stat.h>
+#include <linux/interrupt.h>
+#include <asm/machdep.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/traps.h>
+#include <asm/blinken.h>
+
+/* Clock hardware definitions */
+
+#define CLOCKBASE 0xf05f8000
+
+#define CLKCR1 0x1
+#define CLKCR2 0x3
+#define CLKCR3 CLKCR1
+#define CLKSR CLKCR2
+#define CLKMSB1 0x5
+#define CLKMSB2 0x9
+#define CLKMSB3 0xD
+
+/* This is for machines which generate the exact clock. */
+#define USECS_PER_JIFFY (1000000/HZ)
+
+#define INTVAL ((10000 / 4) - 1)
+
+static irqreturn_t hp300_tick(int irq, void *dev_id)
+{
+ unsigned long tmp;
+ irq_handler_t vector = dev_id;
+ in_8(CLOCKBASE + CLKSR);
+ asm volatile ("movpw %1@(5),%0" : "=d" (tmp) : "a" (CLOCKBASE));
+ /* Turn off the network and SCSI leds */
+ blinken_leds(0, 0xe0);
+ return vector(irq, NULL);
+}
+
+u32 hp300_gettimeoffset(void)
+{
+ /* Read current timer 1 value */
+ unsigned char lsb, msb1, msb2;
+ unsigned short ticks;
+
+ msb1 = in_8(CLOCKBASE + 5);
+ lsb = in_8(CLOCKBASE + 7);
+ msb2 = in_8(CLOCKBASE + 5);
+ if (msb1 != msb2)
+ /* A carry happened while we were reading. Read it again */
+ lsb = in_8(CLOCKBASE + 7);
+ ticks = INTVAL - ((msb2 << 8) | lsb);
+ return ((USECS_PER_JIFFY * ticks) / INTVAL) * 1000;
+}
+
+void __init hp300_sched_init(irq_handler_t vector)
+{
+ out_8(CLOCKBASE + CLKCR2, 0x1); /* select CR1 */
+ out_8(CLOCKBASE + CLKCR1, 0x1); /* reset */
+
+ asm volatile(" movpw %0,%1@(5)" : : "d" (INTVAL), "a" (CLOCKBASE));
+
+ if (request_irq(IRQ_AUTO_6, hp300_tick, 0, "timer tick", vector))
+ pr_err("Couldn't register timer interrupt\n");
+
+ out_8(CLOCKBASE + CLKCR2, 0x1); /* select CR1 */
+ out_8(CLOCKBASE + CLKCR1, 0x40); /* enable irq */
+}