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-rw-r--r--src/cpu/amd/agesa_wrapper/family14/apic_timer.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/src/cpu/amd/agesa_wrapper/family14/apic_timer.c b/src/cpu/amd/agesa_wrapper/family14/apic_timer.c
new file mode 100644
index 000000000..26d3f88e4
--- /dev/null
+++ b/src/cpu/amd/agesa_wrapper/family14/apic_timer.c
@@ -0,0 +1,58 @@
+/*
+ *****************************************************************************
+ *
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011 Advanced Micro Devices, Inc.
+ *
+ * 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; version 2 of the License.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ * ***************************************************************************
+ *
+ */
+
+#include <stdint.h>
+#include <delay.h>
+#include <cpu/x86/msr.h>
+#include <cpu/x86/lapic.h>
+
+/* NOTE: We use the APIC TIMER register is to hold flags for AP init during
+ * pre-memory init (__PRE_RAM__). Don't use init_timer() and udelay is
+ * redirected to udelay_tsc().
+ */
+
+
+void init_timer(void)
+{
+ /* Set the apic timer to no interrupts and periodic mode */
+ lapic_write(LAPIC_LVTT, (1 << 17)|(1<< 16)|(0 << 12)|(0 << 0));
+
+ /* Set the divider to 1, no divider */
+ lapic_write(LAPIC_TDCR, LAPIC_TDR_DIV_1);
+
+ /* Set the initial counter to 0xffffffff */
+ lapic_write(LAPIC_TMICT, 0xffffffff);
+}
+
+
+void udelay(u32 usecs)
+{
+ u32 start, value, ticks;
+ /* Calculate the number of ticks to run, our FSB runs a 200Mhz */
+ ticks = usecs * 200;
+ start = lapic_read(LAPIC_TMCCT);
+ do {
+ value = lapic_read(LAPIC_TMCCT);
+ } while((start - value) < ticks);
+
+}