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soc/intel/skylake: Support PCH UART 0 and 1 for console 

The current PCH UART support for console is limited to UART2.

This change adds support for specifying UART0 or UART1 to be
used instead by changing CONFIG_UART_FOR_CONSOLE in the board
level Kconfig.  The default is still 2.

This is tested with a board that uses UART0 for debug output.

Change-Id: I91323ed3298f9b2558764aa4b54173833c021a7b
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://review.coreboot.org/26140
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Duncan Laurie 2018-05-07 11:56:52 -07:00
parent 3e582d1613
commit 8735d1bdc7
1 changed files with 27 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
src/soc/intel/skylake/uart.c
View File

@ -31,10 +31,20 @@
#define PCR_SERIAL_IO_GPPRVRW7 0x618
#define PCR_SIO_PCH_LEGACY_UART(idx) (1 << (idx))
/* UART2 pad configuration. Support RXD and TXD for now. */
static const struct pad_config uart2_pads[] = {
/* UART2_RXD */ PAD_CFG_NF(GPP_C20, NONE, DEEP, NF1),
/* UART2_TXD */ PAD_CFG_NF(GPP_C21, NONE, DEEP, NF1),
/* UART pad configuration. Support RXD and TXD for now. */
static const struct pad_config uart_pads[][2] = {
{
PAD_CFG_NF(GPP_C8, NONE, DEEP, NF1), /* UART0_RXD */
PAD_CFG_NF(GPP_C9, NONE, DEEP, NF1), /* UART0_TXD */
},
{
PAD_CFG_NF(GPP_C12, NONE, DEEP, NF1), /* UART1_RXD */
PAD_CFG_NF(GPP_C13, NONE, DEEP, NF1), /* UART1_TXD */
},
{
PAD_CFG_NF(GPP_C20, NONE, DEEP, NF1), /* UART2_RXD */
PAD_CFG_NF(GPP_C21, NONE, DEEP, NF1), /* UART2_TXD */
}
};
#if IS_ENABLED(CONFIG_DRIVERS_UART_8250MEM)
@ -50,9 +60,9 @@ void pch_uart_init(void)
{
uintptr_t base = uart_platform_base(CONFIG_UART_FOR_CONSOLE);
uart_common_init(PCH_DEV_UART2, base);
uart_common_init(pch_uart_get_debug_controller(), base);
/* Put UART2 in byte access mode for 16550 compatibility */
/* Put UART in byte access mode for 16550 compatibility */
if (!IS_ENABLED(CONFIG_DRIVERS_UART_8250MEM_32)) {
pcr_write32(PID_SERIALIO, PCR_SERIAL_IO_GPPRVRW7,
PCR_SIO_PCH_LEGACY_UART(CONFIG_UART_FOR_CONSOLE));
@ -64,7 +74,8 @@ void pch_uart_init(void)
lpss_clk_read(base);
}
gpio_configure_pads(uart2_pads, ARRAY_SIZE(uart2_pads));
gpio_configure_pads(uart_pads[CONFIG_UART_FOR_CONSOLE],
ARRAY_SIZE(uart_pads[CONFIG_UART_FOR_CONSOLE]));
}
#if !ENV_SMM
@ -96,5 +107,13 @@ bool pch_uart_init_debug_controller_on_resume(void)
device_t pch_uart_get_debug_controller(void)
{
return PCH_DEV_UART2;
switch (CONFIG_UART_FOR_CONSOLE) {
case 0:
return PCH_DEV_UART0;
case 1:
return PCH_DEV_UART1;
case 2:
default:
return PCH_DEV_UART2;
}
}