soc/amd/genoa: Add aoac.c & enable AOAC devices early

Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Signed-off-by: Martin Roth <gaumless@gmail.com>
Change-Id: Ic9553e6016c92c9b1678c395cd6a9e6860bf8a76
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76506
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/genoa/Kconfig

@@ -10,6 +10,7 @@ config SOC_SPECIFIC_OPTIONS
 	select RESET_VECTOR_IN_RAM
 	select SOC_AMD_COMMON
 	select SOC_AMD_COMMON_BLOCK_ACPIMMIO
+	select SOC_AMD_COMMON_BLOCK_AOAC
 	select SOC_AMD_COMMON_BLOCK_CPUFREQ_FAM17H_19H
 	select SOC_AMD_COMMON_BLOCK_NONCAR
 	select SOC_AMD_COMMON_BLOCK_PCI_MMCONF

src/soc/amd/genoa/Makefile.inc

@@ -6,9 +6,11 @@ all-y		+= reset.c
 all-y		+= config.c
 
 bootblock-y	+= early_fch.c
+bootblock-y	+= aoac.c
 
 romstage-y	+= romstage.c
 
+ramstage-y	+= aoac.c
 ramstage-y	+= chip.c
 
 CPPFLAGS_common += -I$(src)/soc/amd/genoa/include

src/soc/amd/genoa/aoac.c

@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <stdint.h>
+#include <amdblocks/acpimmio.h>
+#include <amdblocks/aoac.h>
+#include <soc/aoac_defs.h>
+#include <soc/southbridge.h>
+#include <delay.h>
+
+#define FCH_AOAC_UART_FOR_CONSOLE \
+		(CONFIG_UART_FOR_CONSOLE == 0 ? FCH_AOAC_DEV_UART0 \
+		: CONFIG_UART_FOR_CONSOLE == 1 ? FCH_AOAC_DEV_UART1 \
+		: CONFIG_UART_FOR_CONSOLE == 2 ? FCH_AOAC_DEV_UART2 \
+		: -1)
+#if CONFIG(AMD_SOC_CONSOLE_UART) && FCH_AOAC_UART_FOR_CONSOLE == -1
+# error Unsupported UART_FOR_CONSOLE chosen
+#endif
+
+void wait_for_aoac_enabled(unsigned int dev)
+{
+	while (!is_aoac_device_enabled(dev))
+		udelay(100);
+}
+
+void enable_aoac_devices(void)
+{
+	if (CONFIG(AMD_SOC_CONSOLE_UART))
+		power_on_aoac_device(FCH_AOAC_UART_FOR_CONSOLE);
+
+	if (CONFIG(AMD_SOC_CONSOLE_UART))
+		wait_for_aoac_enabled(FCH_AOAC_UART_FOR_CONSOLE);
+}

src/soc/amd/genoa/early_fch.c

@@ -12,6 +12,8 @@
 void fch_pre_init(void)
 {
 	fch_enable_cf9_io();
+
+	enable_aoac_devices();
 }
 
 /* After console init */

src/soc/amd/genoa/include/soc/aoac_defs.h

@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef AMD_GENOA_AOAC_DEFS_H
+#define AMD_GENOA_AOAC_DEFS_H
+
+/* FCH AOAC device offsets for AOAC_DEV_D3_CTL/AOAC_DEV_D3_STATE */
+#define FCH_AOAC_DEV_CLK_GEN		0
+#define FCH_AOAC_DEV_I2C0		5
+#define FCH_AOAC_DEV_I2C1		6
+#define FCH_AOAC_DEV_I2C2		7
+#define FCH_AOAC_DEV_I2C3		8
+#define FCH_AOAC_DEV_I2C4		9
+#define FCH_AOAC_DEV_I2C5		10
+#define FCH_AOAC_DEV_UART0		11
+#define FCH_AOAC_DEV_UART1		12
+#define FCH_AOAC_DEV_UART2		16
+#define FCH_AOAC_DEV_AMBA		17
+#define FCH_AOAC_DEV_ESPI		27
+
+#endif /* AMD_GENOA_AOAC_DEFS_H */