soc/intel/alderlake: Remove ALDERLAKE_A0_CONFIG_PMC_DESCRIPTOR Kconfig

The patch removes Kconfig CONFIG_ALDERLAKE_A0_CONFIGURE_PMC_DESCRIPTOR
code which updates PMC descriptor for an intermediate ADL-P SoC
stepping A0. Since intermediate ADL-P SoC is no longer supported and no
board is selecting the Kconfig, so remove the code that updates PMC
descriptor.

TEST=Build and boot Gimble board

Signed-off-by: Sridhar Siricilla <sridhar.siricilla@intel.com>
Change-Id: I2a629353a4194a7505655346dcab4ef53059e0b7
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63339
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/alderlake/Kconfig

@@ -112,15 +112,6 @@ config CPU_SPECIFIC_OPTIONS
 	select UDK_202005_BINDING
 	select USE_FSP_NOTIFY_PHASE_POST_PCI_ENUM
 
-config ALDERLAKE_A0_CONFIGURE_PMC_DESCRIPTOR
-	bool
-	help
-	  Alder Lake stepping A0 needs a different value for a PMC setting in
-	  the IFD. When this option is selected, coreboot will update the IFD
-	  value at runtime, which allows using an IFD with the new value with
-	  any CPU stepping. To apply this workaround, the IFD region needs to
-	  be writable by the host.
-
 config ALDERLAKE_CAR_ENHANCED_NEM
 	bool
 	default y if !INTEL_CAR_NEM

src/soc/intel/alderlake/Makefile.inc

@@ -16,7 +16,6 @@ bootblock-y += bootblock/report_platform.c
 bootblock-y += espi.c
 bootblock-y += gpio.c
 bootblock-y += p2sb.c
-bootblock-$(CONFIG_ALDERLAKE_A0_CONFIGURE_PMC_DESCRIPTOR) += bootblock/pmc_descriptor.c
 
 romstage-y += espi.c
 romstage-y += gpio.c

src/soc/intel/alderlake/bootblock/bootblock.c

@@ -25,9 +25,6 @@ void bootblock_soc_early_init(void)
 
 void bootblock_soc_init(void)
 {
-	if (CONFIG(ALDERLAKE_A0_CONFIGURE_PMC_DESCRIPTOR))
-		configure_pmc_descriptor();
-
 	report_platform_info();
 	bootblock_pch_init();
 

src/soc/intel/alderlake/bootblock/pmc_descriptor.c

@@ -1,88 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-
-#include <arch/cpu.h>
-#include <arch/mmio.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>
-#include <soc/bootblock.h>
-#include <types.h>
-
-#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 */
-void configure_pmc_descriptor(void)
-{
-	uint8_t si_desc_buf[CONFIG_SI_DESC_REGION_SZ];
-	struct region_device desc_rdev;
-
-	if (cpu_get_cpuid() != CPUID_ALDERLAKE_J0)
-		return;
-
-	if (fmap_locate_area_as_rdev_rw(CONFIG_SI_DESC_REGION, &desc_rdev) < 0) {
-		printk(BIOS_ERR, "Failed to locate %s in the FMAP\n", CONFIG_SI_DESC_REGION);
-		return;
-	}
-
-	if (rdev_readat(&desc_rdev, si_desc_buf, 0, CONFIG_SI_DESC_REGION_SZ) !=
-			CONFIG_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, CONFIG_SI_DESC_REGION_SZ) != CONFIG_SI_DESC_REGION_SZ) {
-		printk(BIOS_ERR, "Failed to erase Descriptor Region area\n");
-		return;
-	}
-
-	if (rdev_writeat(&desc_rdev, si_desc_buf, 0, CONFIG_SI_DESC_REGION_SZ)
-			!= CONFIG_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");
-}

src/soc/intel/alderlake/include/soc/bootblock.h

@@ -17,6 +17,4 @@ void bootblock_pch_init(void);
 void pch_early_iorange_init(void);
 void report_platform_info(void);
 
-void configure_pmc_descriptor(void);
-
 #endif