mainboard.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <amdblocks/amd_pci_util.h>
#include <commonlib/helpers.h>
#include <device/device.h>
#include <soc/acpi.h>
#include <string.h>
#include <types.h>
 
/*
 * These arrays set up the FCH PCI_INTR registers 0xC00/0xC01.
 * This table is responsible for physically routing the PIC and
 * IOAPIC IRQs to the different PCI devices on the system.  It
 * is read and written via registers 0xC00/0xC01 as an
 * Index/Data pair.  These values are chipset and mainboard
 * dependent and should be updated accordingly.
 */
static uint8_t fch_pic_routing[0x80];
static uint8_t fch_apic_routing[0x80];
 
_Static_assert(sizeof(fch_pic_routing) == sizeof(fch_apic_routing),
        "PIC and APIC FCH interrupt tables must be the same size");
 
/*
 * This controls the device -> IRQ routing.
 *
 * Hardcoded IRQs:
 *  0: timer < soc/amd/common/acpi/lpc.asl
 *  1: i8042 - Keyboard
 *  2: cascade
 *  8: rtc0 <- soc/amd/common/acpi/lpc.asl
 *  9: acpi <- soc/amd/common/acpi/lpc.asl
 */
static const struct fch_irq_routing {
        uint8_t intr_index;
        uint8_t pic_irq_num;
        uint8_t apic_irq_num;
} majolica_fch[] = {
        { PIRQ_A,       12,             PIRQ_NC },
        { PIRQ_B,       14,             PIRQ_NC },
        { PIRQ_C,       15,             PIRQ_NC },
        { PIRQ_D,       12,             PIRQ_NC },
        { PIRQ_E,       14,             PIRQ_NC },
        { PIRQ_F,       15,             PIRQ_NC },
        { PIRQ_G,       12,             PIRQ_NC },
        { PIRQ_H,       14,             PIRQ_NC },
 
        { PIRQ_SCI,     ACPI_SCI_IRQ,   ACPI_SCI_IRQ },
        { PIRQ_SD,      PIRQ_NC,        PIRQ_NC },
        { PIRQ_SDIO,    PIRQ_NC,        PIRQ_NC },
        { PIRQ_SATA,    PIRQ_NC,        PIRQ_NC },
        { PIRQ_EMMC,    PIRQ_NC,        PIRQ_NC },
        { PIRQ_GPIO,    11,             11 },
        { PIRQ_I2C0,    10,             10 },
        { PIRQ_I2C1,     7,              7 },
        { PIRQ_I2C2,     6,              6 },
        { PIRQ_I2C3,     5,              5 },
        { PIRQ_UART0,    4,              4 },
        { PIRQ_UART1,    3,              3 },
 
        /* The MISC registers are not interrupt numbers */
        { PIRQ_MISC,    0xfa,           0x00 },
        { PIRQ_MISC0,   0x91,           0x00 },
        { PIRQ_HPET_L,  0x00,           0x00 },
        { PIRQ_HPET_H,  0x00,           0x00 },
};
 
static void init_tables(void)
{
        const struct fch_irq_routing *entry;
        int i;
 
        memset(fch_pic_routing, PIRQ_NC, sizeof(fch_pic_routing));
        memset(fch_apic_routing, PIRQ_NC, sizeof(fch_apic_routing));
 
        for (i = 0; i < ARRAY_SIZE(majolica_fch); i++) {
                entry = majolica_fch + i;
                fch_pic_routing[entry->intr_index] = entry->pic_irq_num;
                fch_apic_routing[entry->intr_index] = entry->apic_irq_num;
        }
}
 
static void pirq_setup(void)
{
        intr_data_ptr = fch_apic_routing;
        picr_data_ptr = fch_pic_routing;
}
 
static void mainboard_init(void *chip_info)
{
}
 
static void mainboard_enable(struct device *dev)
{
        init_tables();
        /* Initialize the PIRQ data structures for consumption */
        pirq_setup();
}
 
struct chip_operations mainboard_ops = {
        .init = mainboard_init,
        .enable_dev = mainboard_enable,
};