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authorwdenk <wdenk>2003-12-06 19:49:23 +0000
committerwdenk <wdenk>2003-12-06 19:49:23 +0000
commita8c7c708a9e0051c6358718c53572a4681eaa22b (patch)
treeb560561c91725eb2f86289da61ee676787419e37 /lib_ppc/interrupts.c
parentfa1399ed127c8be507bf182dc7d8d61a54938d79 (diff)
* Patch by Gleb Natapov, 19 Sep 2003:
Move most of the timer interrupt related PPC code to ppc_lib/interrupts.c * Patch by Anders Larsen, 17 Sep 2003: Bring ARM memory layout in sync with the documentation: stack and malloc-heap are now located _below_ the U-Boot code
Diffstat (limited to 'lib_ppc/interrupts.c')
-rw-r--r--lib_ppc/interrupts.c148
1 files changed, 148 insertions, 0 deletions
diff --git a/lib_ppc/interrupts.c b/lib_ppc/interrupts.c
new file mode 100644
index 00000000000..1e540a5c3f7
--- /dev/null
+++ b/lib_ppc/interrupts.c
@@ -0,0 +1,148 @@
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2003
+ * Gleb Natapov <gnatapov@mrv.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 <common.h>
+#include <asm/processor.h>
+#include <watchdog.h>
+#ifdef CONFIG_STATUS_LED
+#include <status_led.h>
+#endif
+
+#ifdef CONFIG_SHOW_ACTIVITY
+ extern void board_show_activity (ulong);
+#endif /* CONFIG_SHOW_ACTIVITY */
+
+#ifndef CFG_WATCHDOG_FREQ
+#define CFG_WATCHDOG_FREQ (CFG_HZ / 2)
+#endif
+
+extern int interrupt_init_cpu (unsigned *);
+extern void timer_interrupt_cpu (struct pt_regs *);
+
+static unsigned decrementer_count; /* count value for 1e6/HZ microseconds */
+
+static __inline__ unsigned long get_msr (void)
+{
+ unsigned long msr;
+
+ asm volatile ("mfmsr %0":"=r" (msr):);
+
+ return msr;
+}
+
+static __inline__ void set_msr (unsigned long msr)
+{
+ asm volatile ("mtmsr %0"::"r" (msr));
+}
+
+static __inline__ unsigned long get_dec (void)
+{
+ unsigned long val;
+
+ asm volatile ("mfdec %0":"=r" (val):);
+
+ return val;
+}
+
+
+static __inline__ void set_dec (unsigned long val)
+{
+ if (val)
+ asm volatile ("mtdec %0"::"r" (val));
+}
+
+
+void enable_interrupts (void)
+{
+ set_msr (get_msr () | MSR_EE);
+}
+
+/* returns flag if MSR_EE was set before */
+int disable_interrupts (void)
+{
+ ulong msr = get_msr ();
+
+ set_msr (msr & ~MSR_EE);
+ return ((msr & MSR_EE) != 0);
+}
+
+int interrupt_init (void)
+{
+ int ret;
+
+ /* call cpu specific function from $(CPU)/interrupts.c */
+ ret = interrupt_init_cpu (&decrementer_count);
+
+ if (ret)
+ return ret;
+
+ set_dec (decrementer_count);
+
+ set_msr (get_msr () | MSR_EE);
+
+ return (0);
+}
+
+static volatile ulong timestamp = 0;
+
+void timer_interrupt (struct pt_regs *regs)
+{
+ /* call cpu specific function from $(CPU)/interrupts.c */
+ timer_interrupt_cpu (regs);
+
+ /* Restore Decrementer Count */
+ set_dec (decrementer_count);
+
+ timestamp++;
+
+#if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG)
+ if ((timestamp % (CFG_WATCHDOG_FREQ)) == 0)
+ WATCHDOG_RESET ();
+#endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */
+
+#ifdef CONFIG_STATUS_LED
+ status_led_tick (timestamp);
+#endif /* CONFIG_STATUS_LED */
+
+#ifdef CONFIG_SHOW_ACTIVITY
+ board_show_activity (timestamp);
+#endif /* CONFIG_SHOW_ACTIVITY */
+}
+
+void reset_timer (void)
+{
+ timestamp = 0;
+}
+
+ulong get_timer (ulong base)
+{
+ return (timestamp - base);
+}
+
+void set_timer (ulong t)
+{
+ timestamp = t;
+}