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-rw-r--r--arch/x86/cpu/coreboot/timestamp.c4
-rw-r--r--arch/x86/cpu/timer.c3
-rw-r--r--arch/x86/include/asm/u-boot-x86.h2
-rw-r--r--arch/x86/lib/Makefile1
-rw-r--r--arch/x86/lib/tsc_timer.c103
5 files changed, 112 insertions, 1 deletions
diff --git a/arch/x86/cpu/coreboot/timestamp.c b/arch/x86/cpu/coreboot/timestamp.c
index 2ca7a57..d26718e 100644
--- a/arch/x86/cpu/coreboot/timestamp.c
+++ b/arch/x86/cpu/coreboot/timestamp.c
@@ -39,7 +39,9 @@ static struct timestamp_table *ts_table __attribute__((section(".data")));
void timestamp_init(void)
{
ts_table = lib_sysinfo.tstamp_table;
- timer_set_tsc_base(ts_table->base_time);
+#ifdef CONFIG_SYS_X86_TSC_TIMER
+ timer_set_base(ts_table->base_time);
+#endif
timestamp_add_now(TS_U_BOOT_INITTED);
}
diff --git a/arch/x86/cpu/timer.c b/arch/x86/cpu/timer.c
index 149109d..f95fce5 100644
--- a/arch/x86/cpu/timer.c
+++ b/arch/x86/cpu/timer.c
@@ -10,8 +10,11 @@
#include <common.h>
+/* Temporary patch to maintain bisectability, removed in next commit */
+#ifndef CONFIG_SYS_X86_TSC_TIMER
unsigned long timer_get_us(void)
{
printf("timer_get_us used but not implemented.\n");
return 0;
}
+#endif
diff --git a/arch/x86/include/asm/u-boot-x86.h b/arch/x86/include/asm/u-boot-x86.h
index 5a59db6..bec583f 100644
--- a/arch/x86/include/asm/u-boot-x86.h
+++ b/arch/x86/include/asm/u-boot-x86.h
@@ -39,6 +39,8 @@ void panic_puts(const char *str);
void timer_isr(void *);
typedef void (timer_fnc_t) (void);
int register_timer_isr (timer_fnc_t *isr_func);
+unsigned long get_tbclk_mhz(void);
+void timer_set_base(uint64_t base);
/* Architecture specific - can be in arch/x86/cpu/, arch/x86/lib/, or $(BOARD)/ */
int dram_init_f(void);
diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
index 962593d..0bc8c2f 100644
--- a/arch/x86/lib/Makefile
+++ b/arch/x86/lib/Makefile
@@ -37,6 +37,7 @@ COBJS-y += relocate.o
COBJS-y += physmem.o
COBJS-y += string.o
COBJS-$(CONFIG_SYS_X86_ISR_TIMER) += timer.o
+COBJS-$(CONFIG_SYS_X86_TSC_TIMER) += tsc_timer.o
COBJS-$(CONFIG_VIDEO_VGA) += video.o
COBJS-$(CONFIG_CMD_ZBOOT) += zimage.o
diff --git a/arch/x86/lib/tsc_timer.c b/arch/x86/lib/tsc_timer.c
new file mode 100644
index 0000000..d931e5f
--- /dev/null
+++ b/arch/x86/lib/tsc_timer.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2012 The Chromium OS Authors.
+ *
+ * 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 <malloc.h>
+#include <asm/io.h>
+#include <asm/i8254.h>
+#include <asm/ibmpc.h>
+#include <asm/msr.h>
+#include <asm/u-boot-x86.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+void timer_set_base(u64 base)
+{
+ gd->arch.tsc_base = base;
+}
+
+/*
+ * Get the number of CPU time counter ticks since it was read first time after
+ * restart. This yields a free running counter guaranteed to take almost 6
+ * years to wrap around even at 100GHz clock rate.
+ */
+u64 get_ticks(void)
+{
+ u64 now_tick = rdtsc();
+
+ /* We assume that 0 means the base hasn't been set yet */
+ if (!gd->arch.tsc_base)
+ panic("No tick base available");
+ return now_tick - gd->arch.tsc_base;
+}
+
+#define PLATFORM_INFO_MSR 0xce
+
+/* Get the speed of the TSC timer in MHz */
+unsigned long get_tbclk_mhz(void)
+{
+ u32 ratio;
+ u64 platform_info = native_read_msr(PLATFORM_INFO_MSR);
+
+ /* 100MHz times Max Non Turbo ratio */
+ ratio = (platform_info >> 8) & 0xff;
+ return 100 * ratio;
+}
+
+unsigned long get_tbclk(void)
+{
+ return get_tbclk_mhz() * 1000 * 1000;
+}
+
+static ulong get_ms_timer(void)
+{
+ return (get_ticks() * 1000) / get_tbclk();
+}
+
+ulong get_timer(ulong base)
+{
+ return get_ms_timer() - base;
+}
+
+ulong timer_get_us(void)
+{
+ return get_ticks() / get_tbclk_mhz();
+}
+
+ulong timer_get_boot_us(void)
+{
+ return timer_get_us();
+}
+
+void __udelay(unsigned long usec)
+{
+ u64 now = get_ticks();
+ u64 stop;
+
+ stop = now + usec * get_tbclk_mhz();
+
+ while ((int64_t)(stop - get_ticks()) > 0)
+ ;
+}
+
+int timer_init(void)
+{
+ /* Nothing to do here - the timer needs no init */
+ return 0;
+}