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| author | Randall Spangler <rspangler@chromium.org> | 2012-04-06 09:33:41 -0700 |
|---|---|---|
| committer | Randall Spangler <rspangler@chromium.org> | 2012-04-09 10:33:35 -0700 |
| commit | e9328ac4f63351b4282916034270aa86b7e74922 (patch) | |
| tree | d0fde5840594c33709927a5a4d1fabfe0f858c26 /chip/lm4/registers.h | |
| parent | 1a9a415cf68c6e8e3b31972c072c81ed886290ab (diff) | |
| download | chrome-ec-e9328ac4f63351b4282916034270aa86b7e74922.tar.gz | |
Support dynamically changing the system clock
Add nopll command to turn off the PLL, reducing the system clock to 16Mhz.
Signed-off-by: Randall Spangler <rspangler@chromium.org>
BUG=chrome-os-partner:8798
TEST=manual
boot system
press power button to boot x86
temps // should print all temperatures
timerinfo
timerinfo
timerinfo // convince yourself this is counting up at about 1MHz
nopll // this drops the system clock to 16MHz
temps // should still print all temperatures
timerinfo
timerinfo
timerinfo // should still be counting up at about 1MHz
Change-Id: Ie29ceb17af348148bffadf63d60c1b731f4c3f6d
Diffstat (limited to 'chip/lm4/registers.h')
| -rw-r--r-- | chip/lm4/registers.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/chip/lm4/registers.h b/chip/lm4/registers.h index a572e763ed..1617e97cd4 100644 --- a/chip/lm4/registers.h +++ b/chip/lm4/registers.h @@ -191,7 +191,17 @@ static inline int lm4_fan_addr(int ch, int offset) #define LM4_SYSTEM_MISC LM4REG(0x400fe058) #define LM4_SYSTEM_RESC LM4REG(0x400fe05c) #define LM4_SYSTEM_RCC LM4REG(0x400fe060) +#define LM4_SYSTEM_RCC_SYSDIV(x) (((x) & 0xf) << 23) +#define LM4_SYSTEM_RCC_USESYSDIV (1 << 22) +#define LM4_SYSTEM_RCC_PWRDN (1 << 13) +#define LM4_SYSTEM_RCC_BYPASS (1 << 11) +#define LM4_SYSTEM_RCC_XTAL(x) (((x) & 0x1f) << 6) +#define LM4_SYSTEM_RCC_OSCSRC(x) (((x) & 0x3) << 4) +#define LM4_SYSTEM_RCC_IOSCDIS (1 << 1) +#define LM4_SYSTEM_RCC_MOSCDIS (1 << 0) #define LM4_SYSTEM_RCC2 LM4REG(0x400fe070) +#define LM4_SYSTEM_RCC2_USERCC2 (1 << 31) +#define LM4_SYSTEM_MOSCCTL LM4REG(0x400fe07c) #define LM4_SYSTEM_PIOSCCAL LM4REG(0x400fe150) #define LM4_SYSTEM_PIOSCSTAT LM4REG(0x400fe154) #define LM4_SYSTEM_PLLSTAT LM4REG(0x400fe168) |