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| author | Lee Leahy <leroy.p.leahy@intel.com> | 2016-05-07 09:04:46 -0700 |
|---|---|---|
| committer | Leroy P Leahy <leroy.p.leahy@intel.com> | 2016-05-09 18:45:44 +0200 |
| commit | 6ec72c9b4f4a903d9a451bc17629e679399aa9ee (patch) | |
| tree | 815f70ba90e3646911d8380d803c823f1fefb507 /src/soc/intel | |
| parent | 148762110c8a00c88b8e0326ec69dc7392bf3739 (diff) | |
| download | coreboot-6ec72c9b4f4a903d9a451bc17629e679399aa9ee.tar.xz | |
drivers/uart: Use uart_platform_refclk for all UART models
Allow the platform to override the input clock for the UART by
implementing the routine uart_platform_refclk and setting the Kconfig
value UART_OVERRIDE_REFCLK. Provide a default uart_platform_refclk
routine which is disabled when UART_OVERRIDE_REFCLK is selected. This
works around ROMCC not supporting weak routines.
Testing on Galileo:
* Edit the src/mainboard/intel/galileo/Makefile.inc file:
* Add "select ADD_FSP_PDAT_FILE"
* Add "select ADD_FSP_RAW_BIN"
* Add "select ADD_RMU_FILE"
* Place the FSP.bin file in the location specified by CONFIG_FSP_FILE
* Place the pdat.bin files in the location specified by
CONFIG_FSP_PDAT_FILE
* Place the rmu.bin file in the location specified by CONFIG_RMU_FILE
* Build EDK2 CorebootPayloadPkg/CorebootPayloadPkgIa32.dsc to generate
UEFIPAYLOAD.fd
* Testing is successful when CorebootPayloadPkg is able to properly
initialize the serial port without using built-in values.
Change-Id: If4afc45a828e5ba935fecb6d95b239625e912d14
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/14612
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
Diffstat (limited to 'src/soc/intel')
| -rw-r--r-- | src/soc/intel/apollolake/uart_early.c | 6 | ||||
| -rw-r--r-- | src/soc/intel/quark/Kconfig | 1 | ||||
| -rw-r--r-- | src/soc/intel/skylake/uart_debug.c | 11 |
3 files changed, 1 insertions, 17 deletions
diff --git a/src/soc/intel/apollolake/uart_early.c b/src/soc/intel/apollolake/uart_early.c index e8dfeda565..0e530609bd 100644 --- a/src/soc/intel/apollolake/uart_early.c +++ b/src/soc/intel/apollolake/uart_early.c @@ -68,12 +68,6 @@ uintptr_t uart_platform_base(int idx) return (CONFIG_CONSOLE_UART_BASE_ADDRESS); } -unsigned int uart_platform_refclk(void) -{ - /* That's within 0.5% of the actual value we've set earlier */ - return 115200 * 16; -} - static const struct pad_config uart_gpios[] = { PAD_CFG_NF(GPIO_42, NATIVE, DEEP, NF1), /* UART1 RX */ PAD_CFG_NF(GPIO_43, NATIVE, DEEP, NF1), /* UART1 TX */ diff --git a/src/soc/intel/quark/Kconfig b/src/soc/intel/quark/Kconfig index ae25c328c6..6a2349fb8d 100644 --- a/src/soc/intel/quark/Kconfig +++ b/src/soc/intel/quark/Kconfig @@ -30,6 +30,7 @@ config CPU_SPECIFIC_OPTIONS select SOC_INTEL_COMMON select SOC_SETS_MTRRS select TSC_CONSTANT_RATE + select UART_OVERRIDE_REFCLK select UDELAY_TSC select UNCOMPRESSED_RAMSTAGE select USE_MARCH_586 diff --git a/src/soc/intel/skylake/uart_debug.c b/src/soc/intel/skylake/uart_debug.c index c463bea145..f3d576b3aa 100644 --- a/src/soc/intel/skylake/uart_debug.c +++ b/src/soc/intel/skylake/uart_debug.c @@ -18,17 +18,6 @@ #include <soc/iomap.h> #include <soc/serialio.h> -unsigned int uart_platform_refclk(void) -{ - /* - * Set M and N divisor inputs and enable clock. - * Main reference frequency to UART is: - * 120MHz * M / N = 120MHz * 48 / 3125 = 1843200Hz - * The different order below is to handle integer math overflow. - */ - return 120 * MHz / SIO_REG_PPR_CLOCK_N_DIV * SIO_REG_PPR_CLOCK_M_DIV; -} - uintptr_t uart_platform_base(int idx) { /* Same base address for all debug port usage. In reality UART2 |