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>
Reviewed-on: http://review.coreboot.org/11749
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
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;