briQ timer support

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1594 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/mainboard/totalimpact/briq/clock.c

@@ -0,0 +1,42 @@
+#include <stdint.h>
+#include "../../../northbridge/ibm/cpc710/cpc710.h"
+
+/*
+ * Bus clock jumper settings on SIOR0 27:28
+ */
+static uint32_t BusClockSpeed[] = {
+	66000000,	/* 00 */
+	83000000,	/* 01 */
+	100000000,	/* 10 */
+	133000000	/* 11 */
+};
+
+/*
+ * Timer frequency is 1/4 of the bus clock frequency.
+ *
+ * For the briQ, bits 27:28 of SIOR0 encode bus clock frequency.
+ */
+unsigned long 
+get_timer_freq(void)
+{
+	uint32_t sior0 = getCPC710(CPC710_SDRAM0_SIOR0);
+
+	return BusClockSpeed[(sior0 >> 3) & 0x2] / 4;
+}
+
+/*
+ * Frequency of PCI bus.
+ * 
+ * For the briQ, bit 29 of SIOR0 is 66MHz enable (active low).
+ */
+unsigned long 
+get_pci_bus_freq(void)
+{
+	uint32_t sior0 = getCPC710(CPC710_SDRAM0_SIOR0);
+
+	if (sior0 & 0x4 == 0x4)
+		return 33000000;
+
+	return 66000000;
+}
+