Zheng Bao (zheng.bao@amd.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/11749
-gerrit
commit 3e6639ede415c9d58e358045b1b89c2811447945 Author: Zheng Bao fishbaozi@gmail.com Date: Sat Nov 21 12:19:22 2015 +0800
AMD/bettong: Add UART support
The function delay in uart8250mem.c is not enough for hudson. I guess there are some problems in lapic_timer(). I uploaded a patch to gerrit to show the way to enable UART feature. http://review.coreboot.org/#/c/12343/4
Currently the HUDSON_UART is unchecked by default. Select HUDSON_UART to enable this feature.
The UART is test at BIOS stage.
Since it is not a standart UART device, the windows internal UART driver doesnt support it. I guess we need a driver to use it on windows.
Change-Id: I4cec833cc2ff8069c82886837f7cbd4483ff11bb Signed-off-by: Zheng Bao zheng.bao@amd.com Signed-off-by: Zheng Bao fishbaozi@gmail.com --- src/mainboard/amd/bettong/romstage.c | 3 +++ src/southbridge/amd/pi/hudson/Kconfig | 16 +++++++++++++++ src/southbridge/amd/pi/hudson/Makefile.inc | 5 +++++ src/southbridge/amd/pi/hudson/early_setup.c | 31 +++++++++++++++++++++++++++++ src/southbridge/amd/pi/hudson/hudson.h | 3 +++ 5 files changed, 58 insertions(+)
diff --git a/src/mainboard/amd/bettong/romstage.c b/src/mainboard/amd/bettong/romstage.c index 6399804..b0ec8fd 100644 --- a/src/mainboard/amd/bettong/romstage.c +++ b/src/mainboard/amd/bettong/romstage.c @@ -39,6 +39,9 @@ void cache_as_ram_main(unsigned long bist, unsigned long cpu_init_detectedx) if (!cpu_init_detectedx && boot_cpu()) { post_code(0x30);
+#if IS_ENABLED(CONFIG_HUDSON_UART) + configure_hudson_uart(); +#endif post_code(0x31); console_init(); } diff --git a/src/southbridge/amd/pi/hudson/Kconfig b/src/southbridge/amd/pi/hudson/Kconfig index c720791..94a313d 100644 --- a/src/southbridge/amd/pi/hudson/Kconfig +++ b/src/southbridge/amd/pi/hudson/Kconfig @@ -227,3 +227,19 @@ config AZ_PIN bit 5,4 - pin 2 bit 7,6 - pin 3 endif + +config HUDSON_UART + bool "UART controller on Kern." + default n + depends on SOUTHBRIDGE_AMD_PI_KERN + select DRIVERS_UART_8250MEM + select DRIVERS_UART_8250MEM_32 + select NO_UART_ON_SUPERIO + help + There are two UART controllers in Kern. + The UART registers are memory-mapped. UART + controller 0 registers range from FEDC_6000h + to FEDC_6FFFh. UART controller 1 registers + range from FEDC_8000h to FEDC_8FFFh. + + diff --git a/src/southbridge/amd/pi/hudson/Makefile.inc b/src/southbridge/amd/pi/hudson/Makefile.inc index fb775c5..81558d3 100644 --- a/src/southbridge/amd/pi/hudson/Makefile.inc +++ b/src/southbridge/amd/pi/hudson/Makefile.inc @@ -50,6 +50,11 @@ romstage-y += imc.c ramstage-y += imc.c endif
+ifeq ($(CONFIG_HUDSON_UART), y) +romstage-y += uart.c +ramstage-y += uart.c +endif + smm-$(CONFIG_HAVE_SMI_HANDLER) += smihandler.c smi_util.c ramstage-$(CONFIG_HAVE_SMI_HANDLER) += smi.c smi_util.c
diff --git a/src/southbridge/amd/pi/hudson/early_setup.c b/src/southbridge/amd/pi/hudson/early_setup.c index 14ffd8b..f4fcf8b 100644 --- a/src/southbridge/amd/pi/hudson/early_setup.c +++ b/src/southbridge/amd/pi/hudson/early_setup.c @@ -26,6 +26,37 @@ #include "hudson.h" #include "pci_devs.h"
+#if IS_ENABLED(CONFIG_HUDSON_UART) + +#include <cpu/x86/msr.h> +#include <delay.h> +#include <Fch/Fch.h> + +void configure_hudson_uart(void) +{ + msr_t msr; + u8 byte; + + msr = rdmsr(0x1B); + msr.lo |= 1 << 11; + wrmsr(0x1B, msr); + byte = read8((void *)ACPI_MMIO_BASE + AOAC_BASE + FCH_AOAC_REG56 + CONFIG_UART_FOR_CONSOLE * 2); + byte |= 1 << 3; + write8((void *)ACPI_MMIO_BASE + AOAC_BASE + FCH_AOAC_REG56 + CONFIG_UART_FOR_CONSOLE * 2, byte); + byte = read8((void *)ACPI_MMIO_BASE + AOAC_BASE + FCH_AOAC_REG62); + byte |= 1 << 3; + write8((void *)ACPI_MMIO_BASE + AOAC_BASE + FCH_AOAC_REG62, byte); + write8((void *)FCH_IOMUXx89_UART0_RTS_L_EGPIO137, 0); + write8((void *)FCH_IOMUXx8A_UART0_TXD_EGPIO138, 0); + write8((void *)FCH_IOMUXx8E_UART1_RTS_L_EGPIO142, 0); + write8((void *)FCH_IOMUXx8F_UART1_TXD_EGPIO143, 0); + + udelay(2000); + write8((void *)0xFEDC6000 + 0x2000 * CONFIG_UART_FOR_CONSOLE + 0x88, 0x01); /* reset UART */ +} + +#endif + void hudson_pci_port80(void) { u8 byte; diff --git a/src/southbridge/amd/pi/hudson/hudson.h b/src/southbridge/amd/pi/hudson/hudson.h index 6f37c90..23d9b31 100644 --- a/src/southbridge/amd/pi/hudson/hudson.h +++ b/src/southbridge/amd/pi/hudson/hudson.h @@ -112,6 +112,9 @@ void hudson_clk_output_48Mhz(void);
int s3_save_nvram_early(u32 dword, int size, int nvram_pos); int s3_load_nvram_early(int size, u32 *old_dword, int nvram_pos); +#if IS_ENABLED(CONFIG_HUDSON_UART) +void configure_hudson_uart(void); +#endif
#else void hudson_enable(device_t dev);