[U-Boot] [PATCH 14/31] powerpc/t4qds: use clock measurement for sysclk and ddr clock

[York Sun]

From: Ed Swarthout <Ed.Swarthout at freescale.com>

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 at freescale.com>
Signed-off-by: York Sun <yorksun at freescale.com>
---
 board/freescale/t4qds/t4qds.c |   30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/board/freescale/t4qds/t4qds.c b/board/freescale/t4qds/t4qds.c
index 3eec601..5571a00 100644
--- a/board/freescale/t4qds/t4qds.c
+++ b/board/freescale/t4qds/t4qds.c
@@ -541,6 +541,21 @@ int board_early_init_r(void)
 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:
@@ -564,6 +579,21 @@ unsigned long get_board_sys_clk(void)
 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:
-- 
1.7.9.5