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/* SPDX-License-Identifier: GPL-2.0-only */
#include <arch/mmio.h>
#include <baseboard/variants.h>
#include <bootblock_common.h>
#include <cf9_reset.h>
#include <commonlib/region.h>
#include <console/console.h>
#include <cpu/intel/cpu_ids.h>
#include <fmap.h>
#include <intelblocks/pmclib.h>
#define SI_DESC_REGION "SI_DESC"
#define SI_DESC_REGION_SZ 4096
#define PMC_DESC_7_BYTE3 0xc32
/* Flash Master 1 : HOST/BIOS */
#define FLMSTR1 0x80
/* Flash signature Offset */
#define FLASH_SIGN_OFFSET 0x10
#define FLMSTR_WR_SHIFT_V2 20
#define FLASH_VAL_SIGN 0xFF0A55A
/* It checks whether host(Flash Master 1) has write access to the Descriptor Region or not */
static int is_descriptor_writeable(uint8_t *desc)
{
/* Check flash has valid signature */
if (read32((void *)(desc + FLASH_SIGN_OFFSET)) != FLASH_VAL_SIGN) {
printk(BIOS_DEBUG, "Flash Descriptor is not valid\n");
return 0;
}
/* Check host has write access to the Descriptor Region */
if (!((read32((void *)(desc + FLMSTR1)) >> FLMSTR_WR_SHIFT_V2) & BIT(0))) {
printk(BIOS_DEBUG, "Host doesn't have write access to Descriptor Region\n");
return 0;
}
return 1;
}
/* It updates PMC Descriptor in the Descriptor Region */
static void configure_pmc_descriptor(void)
{
uint8_t si_desc_buf[SI_DESC_REGION_SZ];
struct region_device desc_rdev;
if (fmap_locate_area_as_rdev_rw(SI_DESC_REGION, &desc_rdev) < 0) {
printk(BIOS_ERR, "Failed to locate %s in the FMAP\n", SI_DESC_REGION);
return;
}
if (rdev_readat(&desc_rdev, si_desc_buf, 0, SI_DESC_REGION_SZ) != SI_DESC_REGION_SZ) {
printk(BIOS_ERR, "Failed to read Descriptor Region from SPI Flash\n");
return;
}
if (!is_descriptor_writeable(si_desc_buf))
return;
if (si_desc_buf[PMC_DESC_7_BYTE3] != 0x40) {
printk(BIOS_DEBUG, "Update of PMC Descriptor is not required!\n");
return;
}
si_desc_buf[PMC_DESC_7_BYTE3] = 0x44;
if (rdev_eraseat(&desc_rdev, 0, SI_DESC_REGION_SZ) != SI_DESC_REGION_SZ) {
printk(BIOS_ERR, "Failed to erase Descriptor Region area\n");
return;
}
if (rdev_writeat(&desc_rdev, si_desc_buf, 0, SI_DESC_REGION_SZ)
!= SI_DESC_REGION_SZ) {
printk(BIOS_ERR, "Failed to update Descriptor Region\n");
return;
}
printk(BIOS_DEBUG, "Update of PMC Descriptor successful, trigger GLOBAL RESET\n");
pmc_global_reset_enable(true);
do_full_reset();
die("Failed to trigger GLOBAL RESET\n");
}
void bootblock_mainboard_early_init(void)
{
variant_configure_early_gpio_pads();
}
void bootblock_mainboard_init(void)
{
if (cpu_get_cpuid() == CPUID_ALDERLAKE_A0)
configure_pmc_descriptor();
}
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