powerpc/t4qds: use clock measurement for sysclk and ddr clock
Use QIXIS measurement registers to obtain sysclk and ddr clock. This
allows using non-standard clock speeds, set by directly writing to
clock chip or store the values in qixis clock data eeprom.
Signed-off-by: Ed Swarthout <Ed.Swarthout@freescale.com>
Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
diff --git a/board/freescale/t4qds/t4qds.c b/board/freescale/t4qds/t4qds.c
index 26539db..b48855e 100644
--- a/board/freescale/t4qds/t4qds.c
+++ b/board/freescale/t4qds/t4qds.c
@@ -540,6 +540,20 @@
unsigned long get_board_sys_clk(void)
{
u8 sysclk_conf = QIXIS_READ(brdcfg[1]);
+#ifdef CONFIG_FSL_QIXIS_CLOCK_MEASUREMENT
+ /* use accurate clock measurement */
+ int freq = QIXIS_READ(clk_freq[0]) << 8 | QIXIS_READ(clk_freq[1]);
+ int base = QIXIS_READ(clk_base[0]) << 8 | QIXIS_READ(clk_base[1]);
+ u32 val;
+
+ val = freq * base;
+ if (val) {
+ debug("SYS Clock measurement is: %d\n", val);
+ return val;
+ } else {
+ printf("Warning: SYS clock measurement is invalid, using value from brdcfg1.\n");
+ }
+#endif
switch (sysclk_conf & 0x0F) {
case QIXIS_SYSCLK_83:
@@ -563,6 +577,20 @@
unsigned long get_board_ddr_clk(void)
{
u8 ddrclk_conf = QIXIS_READ(brdcfg[1]);
+#ifdef CONFIG_FSL_QIXIS_CLOCK_MEASUREMENT
+ /* use accurate clock measurement */
+ int freq = QIXIS_READ(clk_freq[2]) << 8 | QIXIS_READ(clk_freq[3]);
+ int base = QIXIS_READ(clk_base[0]) << 8 | QIXIS_READ(clk_base[1]);
+ u32 val;
+
+ val = freq * base;
+ if (val) {
+ debug("DDR Clock measurement is: %d\n", val);
+ return val;
+ } else {
+ printf("Warning: DDR clock measurement is invalid, using value from brdcfg1.\n");
+ }
+#endif
switch ((ddrclk_conf & 0x30) >> 4) {
case QIXIS_DDRCLK_100: