diff options
| author | Alec Berg <alecaberg@chromium.org> | 2013-10-08 16:46:58 -0700 |
|---|---|---|
| committer | chrome-internal-fetch <chrome-internal-fetch@google.com> | 2013-10-10 23:14:20 +0000 |
| commit | 27e063ea100086a913ed655b611c88e077de5b00 (patch) | |
| tree | 701999fd9367e30d008179243a0fc95fc51c5175 /chip/lm4/uart.c | |
| parent | f7e69a211ce0121ec06c79f6d82574d3347dec2f (diff) | |
| download | chrome-ec-27e063ea100086a913ed655b611c88e077de5b00.tar.gz | |
lm4: Modified clock gating to allow easy expansion to low power.
Created a new function to enable or disable clocks to various
peripherals. This new function makes it easy to specify if you
want the clock enabled in run mode, sleep mode, and/or deep
sleep mode.
Added infrastructure to specify which GPIOs should interrupt the
EC from deep sleep.
BUG=none
BRANCH=none
TEST=Passes all unit tests. Ran on a peppy and verified that
the clock gate control registers in run mode (LM4_RCGC regs)
were the same before and after this change.
Change-Id: Ia5009ac8c837f61dca52fe86ebdeede2e1a7fe4d
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/172454
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Diffstat (limited to 'chip/lm4/uart.c')
| -rw-r--r-- | chip/lm4/uart.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/chip/lm4/uart.c b/chip/lm4/uart.c index 75f6fa0724..13fad41be6 100644 --- a/chip/lm4/uart.c +++ b/chip/lm4/uart.c @@ -180,14 +180,16 @@ static void uart_config(int port) void uart_init(void) { - /* Enable UART0 and Host UART and delay a few clocks */ - LM4_SYSTEM_RCGCUART |= 1; + uint32_t mask = 0; + + /* Enable UART0 and Host UART in run, sleep, and deep sleep modes. */ + mask |= 1; #ifdef CONFIG_UART_HOST - LM4_SYSTEM_RCGCUART |= (1 << CONFIG_UART_HOST); + mask |= (1 << CONFIG_UART_HOST); #endif - clock_wait_cycles(3); + clock_enable_peripheral(CGC_OFFSET_UART, mask, CGC_MODE_ALL); gpio_config_module(MODULE_UART, 1); |