summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--src/mainboard/totalimpact/briq/clock.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/src/mainboard/totalimpact/briq/clock.c b/src/mainboard/totalimpact/briq/clock.c
new file mode 100644
index 0000000000..76827653a6
--- /dev/null
+++ b/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;
+}
+