From: Ed Swarthout Ed.Swarthout@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@freescale.com Signed-off-by: York Sun yorksun@freescale.com --- board/freescale/t4qds/t4qds.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+)
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 @@ 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: @@ -563,6 +577,20 @@ 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: