soc/intel/alderlake: Factor out A0 stepping workaround

Move the `configure_pmc_descriptor()` function to SoC scope instead of
having two identical copies in mainboard scope. Add a Kconfig option to
allow mainboards to decide whether to implement this workaround.

Change-Id: Ib99073d8da91a93fae9c0cebdfd73e39456cdaa8
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60940
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sheng Lean Tan <sheng.tan@9elements.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

2 files changed, 1 insertions, 87 deletions

diff --git a/src/mainboard/google/brya/Kconfig b/src/mainboard/google/brya/Kconfig
index 158df8b51b..8b99e7bba1 100644
--- a/src/mainboard/google/brya/Kconfig
+++ b/src/mainboard/google/brya/Kconfig
@@ -1,5 +1,6 @@
 config BOARD_GOOGLE_BRYA_COMMON
 	def_bool n
+	select ALDERLAKE_A0_CONFIGURE_PMC_DESCRIPTOR
 	select BOARD_ROMSIZE_KB_32768
 	select DRIVERS_GENERIC_ALC1015
 	select DRIVERS_GENERIC_GPIO_KEYS
diff --git a/src/mainboard/google/brya/bootblock.c b/src/mainboard/google/brya/bootblock.c
index bd7100a8dc..1815615f5e 100644
--- a/src/mainboard/google/brya/bootblock.c
+++ b/src/mainboard/google/brya/bootblock.c
@@ -1,88 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
 
-#include <arch/mmio.h>
 #include <baseboard/variants.h>
 #include <bootblock_common.h>
-#include <console/console.h>
-#include <fmap.h>
-#include <commonlib/region.h>
-#include <cpu/intel/cpu_ids.h>
-#include <intelblocks/pmclib.h>
-#include <cf9_reset.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)
 {
@@ -91,9 +10,3 @@ void bootblock_mainboard_early_init(void)
 	pads = variant_early_gpio_table(&num);
 	gpio_configure_pads(pads, num);
 }
-
-void bootblock_mainboard_init(void)
-{
-	if (cpu_get_cpuid() == CPUID_ALDERLAKE_A0)
-		configure_pmc_descriptor();
-}