diff options
| author | Ed Swarthout | 2013-03-25 07:40:10 +0000 |
|---|---|---|
| committer | Andy Fleming | 2013-05-24 16:54:12 -0500 |
| commit | f41388159ac6b1a438ea65b6d326f976b99092e1 (patch) | |
| tree | 924c876e73f8904b0f9866a1a4527e07596809fc /board | |
| parent | 428ea86c646fd9b485bfb015cd6293e345e6bb3e (diff) | |
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>
Diffstat (limited to 'board')
| -rw-r--r-- | board/freescale/t4qds/t4qds.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/board/freescale/t4qds/t4qds.c b/board/freescale/t4qds/t4qds.c index 26539db2dfe..b48855e4923 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: |