diff options
| author | Anson Huang <b20788@freescale.com> | 2012-12-05 13:58:34 -0500 |
|---|---|---|
| committer | Anson Huang <b20788@freescale.com> | 2012-12-13 14:34:43 -0500 |
| commit | b7c5badf94ffbe6cd0845efbb75e16e05e3af404 (patch) | |
| tree | 9583c97f389b54a04940dcd047caf64406e42722 | |
| parent | d31df11541ea0d1a0bf1ed7463fd30a25b65f98c (diff) | |
ENGR00235821 mx6: correct work flow of PFDs
PFDs need to be gate/ungate after PLL lock to reset
PFDs to right state. Otherwise PFDs may lose correct
state in state-machine, then no output clock.
For i.MX6DL and i.MX6SL, ROM have taken care of PFD396
already since the bus clock needs it.
Signed-off-by: Anson Huang <b20788@freescale.com>
| -rw-r--r-- | cpu/arm_cortexa8/mx6/generic.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/cpu/arm_cortexa8/mx6/generic.c b/cpu/arm_cortexa8/mx6/generic.c index bd47130fa6..fbba7ffdfc 100644 --- a/cpu/arm_cortexa8/mx6/generic.c +++ b/cpu/arm_cortexa8/mx6/generic.c @@ -1015,6 +1015,37 @@ int arch_cpu_init(void) { int val; + /* Due to hardware limitation, on MX6Q we need to gate/ungate all PFDs + * to make sure PFD is working right, otherwise, PFDs may + * not output clock after reset, MX6DL and MX6SL have added 396M pfd + * workaround in ROM code, as bus clock need it + */ + writel(BM_ANADIG_PFD_480_PFD3_CLKGATE | + BM_ANADIG_PFD_480_PFD2_CLKGATE | + BM_ANADIG_PFD_480_PFD1_CLKGATE | + BM_ANADIG_PFD_480_PFD0_CLKGATE, + ANATOP_BASE_ADDR + HW_ANADIG_PFD_480_SET); + writel(BM_ANADIG_PFD_528_PFD3_CLKGATE | +#ifdef CONFIG_MX6Q + BM_ANADIG_PFD_528_PFD2_CLKGATE | +#endif + BM_ANADIG_PFD_528_PFD1_CLKGATE | + BM_ANADIG_PFD_528_PFD0_CLKGATE, + ANATOP_BASE_ADDR + HW_ANADIG_PFD_528_SET); + + writel(BM_ANADIG_PFD_480_PFD3_CLKGATE | + BM_ANADIG_PFD_480_PFD2_CLKGATE | + BM_ANADIG_PFD_480_PFD1_CLKGATE | + BM_ANADIG_PFD_480_PFD0_CLKGATE, + ANATOP_BASE_ADDR + HW_ANADIG_PFD_480_CLR); + writel(BM_ANADIG_PFD_528_PFD3_CLKGATE | +#ifdef CONFIG_MX6Q + BM_ANADIG_PFD_528_PFD2_CLKGATE | +#endif + BM_ANADIG_PFD_528_PFD1_CLKGATE | + BM_ANADIG_PFD_528_PFD0_CLKGATE, + ANATOP_BASE_ADDR + HW_ANADIG_PFD_528_CLR); + icache_enable(); dcache_enable(); |