soc/amd/cezanne: add GPIO support

This still uses the common GPIO code that supports setting up SMI/SCI
support for the GPIOs in all stages, which will get removed in future
patches, so for now the SoC's gpio.c needs to be included in all stages.

Change-Id: I6c12d1d6c605b7eb063eef62a1f71860f602f8dd
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48565
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/cezanne/Kconfig

@@ -18,6 +18,7 @@ config SOC_SPECIFIC_OPTIONS
 	select RESET_VECTOR_IN_RAM
 	select SOC_AMD_COMMON
 	select SOC_AMD_COMMON_BLOCK_ACPIMMIO
+	select SOC_AMD_COMMON_BLOCK_BANKED_GPIOS
 	select SOC_AMD_COMMON_BLOCK_NONCAR
 	select SOC_AMD_COMMON_BLOCK_PCI_MMCONF
 	select SOC_AMD_COMMON_BLOCK_SMBUS

src/soc/amd/cezanne/Makefile.inc

@@ -9,14 +9,18 @@ all-y += config.c
 
 bootblock-y	+= bootblock.c
 bootblock-y	+= early_fch.c
+bootblock-y	+= gpio.c
 bootblock-y     += reset.c
 
+verstage_x86-y	+= gpio.c
 verstage_x86-y  += reset.c
 
+romstage-y	+= gpio.c
 romstage-y      += reset.c
 romstage-y	+= romstage.c
 
 ramstage-y	+= chip.c
+ramstage-y	+= gpio.c
 ramstage-y      += reset.c
 
 CPPFLAGS_common += -I$(src)/soc/amd/cezanne/include

src/soc/amd/cezanne/gpio.c

@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <stdint.h>
+#include <amdblocks/gpio_banks.h>
+#include <amdblocks/acpimmio.h>
+#include <amdblocks/smi.h>
+#include <soc/gpio.h>
+#include <soc/smi.h>
+
+/* see the IOMUX function table for the mapping from GPIO number to GEVENT number */
+static const struct soc_amd_event gpio_event_table[] = {
+	{ GPIO_0, GEVENT_21 }, /* GPIO0 may only be used as PWR_BTN_L in ACPI */
+	{ GPIO_1, GEVENT_19 },
+	{ GPIO_2, GEVENT_8 },
+	{ GPIO_3, GEVENT_2 },
+	{ GPIO_4, GEVENT_4 },
+	{ GPIO_5, GEVENT_7 },
+	{ GPIO_6, GEVENT_10 },
+	{ GPIO_7, GEVENT_11 },
+	{ GPIO_8, GEVENT_23 },
+	{ GPIO_9, GEVENT_22 },
+	{ GPIO_16, GEVENT_12 },
+	{ GPIO_17, GEVENT_13 },
+	{ GPIO_18, GEVENT_14 },
+	{ GPIO_21, GEVENT_5 },
+	{ GPIO_22, GEVENT_3 },
+	{ GPIO_23, GEVENT_16 },
+	{ GPIO_24, GEVENT_15 },
+	{ GPIO_40, GEVENT_20 },
+	{ GPIO_84, GEVENT_18 },
+	{ GPIO_86, GEVENT_9 },
+	{ GPIO_89, GEVENT_0 },
+	{ GPIO_90, GEVENT_1 },
+	{ GPIO_91, GEVENT_6 },
+	{ GPIO_129, GEVENT_17 },
+};
+
+void soc_route_sci(uint8_t event)
+{
+	smi_write8(SMI_SCI_MAP(event), event);
+}
+
+void soc_get_gpio_event_table(const struct soc_amd_event **table, size_t *items)
+{
+	*table = gpio_event_table;
+	*items = ARRAY_SIZE(gpio_event_table);
+}
+
+void soc_gpio_hook(uint8_t gpio, uint8_t mux)
+{
+	/* Always program Gevent when WAKE_L_AGPIO2 is configured as WAKE_L */
+	if ((gpio == 2) && !(mux & AMD_GPIO_MUX_MASK))
+		soc_route_sci(GPIO_2_EVENT);
+}