Update from 2013.01 to 2013.07

[karo-tx-uboot.git] / arch / x86 / lib / tsc_timer.c

diff --git a/arch/x86/lib/tsc_timer.c b/arch/x86/lib/tsc_timer.c
new file mode 100644 (file)
index 0000000..8b38702
--- /dev/null
+++ b/arch/x86/lib/tsc_timer.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2012 The Chromium OS Authors.
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#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 __attribute__((no_instrument_function)) 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 __attribute__((no_instrument_function)) 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 __attribute__((no_instrument_function)) 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)
+{
+#ifdef CONFIG_SYS_PCAT_TIMER
+       /* Set up the PCAT timer if required */
+       pcat_timer_init();
+#endif
+
+       return 0;
+}