soc/amd/genoa: configure FCH IRQ mapping

Add the code to configure the FCH IRQ mapping registers and provide the
IRQ name strings for each FCH IRQ mapping configuration register.

Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I282ae35ebc4d7754121ce4544b782e3cbe7e2256
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76533
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Varshit Pandya <pandyavarshit@gmail.com>

src/soc/amd/genoa/Kconfig

@@ -28,6 +28,7 @@ config SOC_SPECIFIC_OPTIONS
 	select SOC_AMD_COMMON_BLOCK_LPC
 	select SOC_AMD_COMMON_BLOCK_MCAX
 	select SOC_AMD_COMMON_BLOCK_NONCAR
+	select SOC_AMD_COMMON_BLOCK_PCI
 	select SOC_AMD_COMMON_BLOCK_PCI_MMCONF
 	select SOC_AMD_COMMON_BLOCK_PSP_GEN2
 	select SOC_AMD_COMMON_BLOCK_PSP_SPL

src/soc/amd/genoa/Makefile.inc

@@ -18,6 +18,7 @@ ramstage-y	+= aoac.c
 ramstage-y	+= chip.c
 ramstage-y	+= cpu.c
 ramstage-y	+= domain.c
+ramstage-y	+= fch.c
 ramstage-y	+= root_complex.c
 ramstage-y	+= smihandler.c
 ramstage-y	+= mca.c

src/soc/amd/genoa/fch.c

@@ -0,0 +1,86 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <amdblocks/acpi.h>
+#include <amdblocks/acpimmio.h>
+#include <amdblocks/amd_pci_util.h>
+#include <amdblocks/gpio.h>
+#include <amdblocks/smi.h>
+#include <bootstate.h>
+#include <cpu/x86/smm.h>
+#include <soc/acpi.h>
+#include <soc/amd_pci_int_defs.h>
+#include <soc/smi.h>
+#include <soc/southbridge.h>
+
+/*
+ * Table of APIC register index and associated IRQ name. Using IDX_XXX_NAME
+ * provides a visible association with the index, therefore helping
+ * maintainability of table. If a new index/name is defined in
+ * amd_pci_int_defs.h, just add the pair at the end of this table.
+ * Order is not important.
+ */
+static const struct irq_idx_name irq_association[] = {
+	{ PIRQ_A,	"INTA#" },
+	{ PIRQ_B,	"INTB#" },
+	{ PIRQ_C,	"INTC#" },
+	{ PIRQ_D,	"INTD#" },
+	{ PIRQ_E,	"INTE#" },
+	{ PIRQ_F,	"INTF#/GENINT2" },
+	{ PIRQ_G,	"INTG#" },
+	{ PIRQ_H,	"INTH#" },
+	{ PIRQ_MISC,	"Misc" },
+	{ PIRQ_MISC0,	"Misc0" },
+	{ PIRQ_HPET_L,	"HPET_L" },
+	{ PIRQ_HPET_H,	"HPET_H" },
+	{ PIRQ_SIRQA,	"Ser IRQ INTA" },
+	{ PIRQ_SIRQB,	"Ser IRQ INTB" },
+	{ PIRQ_SIRQC,	"Ser IRQ INTC" },
+	{ PIRQ_SIRQD,	"Ser IRQ INTD" },
+	{ PIRQ_SCI,	"SCI" },
+	{ PIRQ_SMBUS,	"SMBUS" },
+	{ PIRQ_ASF,	"ASF" },
+	{ PIRQ_PMON,	"PerMon" },
+	{ PIRQ_SDIO,	"SDIO" },
+	{ PIRQ_GPP0,	"GPP0" },
+	{ PIRQ_GPP1,	"GPP1" },
+	{ PIRQ_GPP2,	"GPP2" },
+	{ PIRQ_GPP3,	"GPP3" },
+	{ PIRQ_GSCI,	"GEvent SCI" },
+	{ PIRQ_GSMI,	"GEvent SMI" },
+	{ PIRQ_GPIO,	"GPIO" },
+	{ PIRQ_I2C0,	"I2C0" },
+	{ PIRQ_I2C1,	"I2C1" },
+	{ PIRQ_I2C2,	"I2C2" },
+	{ PIRQ_I2C3,	"I2C3" },
+	{ PIRQ_UART0,	"UART0" },
+	{ PIRQ_UART1,	"UART1" },
+	{ PIRQ_I2C4,	"I2C4" },
+	{ PIRQ_I2C5,	"I2C5" },
+	{ PIRQ_UART2,	"UART2" },
+	{ PIRQ_UART3,	"UART3" },
+};
+
+const struct irq_idx_name *sb_get_apic_reg_association(size_t *size)
+{
+	*size = ARRAY_SIZE(irq_association);
+	return irq_association;
+}
+
+static void set_pci_irqs(void)
+{
+	/* Write PCI_INTR regs 0xC00/0xC01 */
+	write_pci_int_table();
+
+	/* TODO: PIRQ configuration */
+}
+
+static void fch_init(void *unused)
+{
+	set_pci_irqs();
+}
+
+/*
+ * Hook this function into the PCI state machine on entry into BS_DEV_ENABLE.
+ * TODO: can this be done without using BOOT_STATE_INIT_ENTRY?
+ */
+BOOT_STATE_INIT_ENTRY(BS_DEV_ENABLE, BS_ON_ENTRY, fch_init, NULL);