soc/intel/xeon_sp/gnr: Support fast boot

Fast boot will used pre-saved hardware configuration data to
accelerate the boot process, e.g. DDR training is skipped by using
pre-saved training data. Enable fast boot on cold and warm resets
by default.

Change-Id: Ib5dc76176b16ea1be5dd9b05a375c9179411f590
Signed-off-by: Gang Chen <gang.c.chen@intel.com>
Signed-off-by: Shuo Liu <shuo.liu@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82080
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>

src/soc/intel/xeon_sp/config.c

@@ -6,3 +6,8 @@ __weak enum xeonsp_cxl_mode get_cxl_mode(void)
 {
 	return XEONSP_CXL_DISABLED;
 }
+
+__weak enum xeonsp_fast_boot_mode get_fast_boot_mode(void)
+{
+	return XEONSP_FAST_BOOT_COLD | XEONSP_FAST_BOOT_WARM;
+}

src/soc/intel/xeon_sp/gnr/romstage.c

@@ -1,5 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#include <console/console.h>
+#include <soc/config.h>
 #include <soc/romstage.h>
 
 static uint8_t get_mmcfg_base_upd_index(const uint64_t base_addr)
@@ -48,6 +50,19 @@ void platform_fsp_memory_init_params_cb(FSPM_UPD *mupd, uint32_t version)
 	m_cfg->mmCfgBase = get_mmcfg_base_upd_index(CONFIG_ECAM_MMCONF_BASE_ADDRESS);
 	m_cfg->mmCfgSize = get_mmcfg_size_upd_index(CONFIG_ECAM_MMCONF_LENGTH);
 
+	/* fast boot setting */
+	int fast_boot_mode = get_fast_boot_mode();
+	m_cfg->AttemptFastBoot = !!(fast_boot_mode & XEONSP_FAST_BOOT_WARM);
+	m_cfg->AttemptFastBootCold = !!(fast_boot_mode & XEONSP_FAST_BOOT_COLD);
+
+	FSPM_ARCH2_UPD *arch_upd = &mupd->FspmArchUpd;
+	if (fast_boot_mode == XEONSP_FAST_BOOT_DISABLED) {
+		arch_upd->BootMode =
+			FSP_BOOT_WITH_FULL_CONFIGURATION;
+		printk(BIOS_NOTICE, "Reset BootMode as "
+				"FSP_BOOT_WITH_FULL_CONFIGURATION.\n");
+	}
+
 	/* Board level settings */
 	mainboard_memory_init_params(mupd);
 }

src/soc/intel/xeon_sp/include/soc/config.h

@@ -11,4 +11,12 @@ enum xeonsp_cxl_mode {
 
 enum xeonsp_cxl_mode get_cxl_mode(void);
 
+enum xeonsp_fast_boot_mode {
+	XEONSP_FAST_BOOT_DISABLED = 0x0,
+	XEONSP_FAST_BOOT_COLD     = 0x1,
+	XEONSP_FAST_BOOT_WARM     = 0x2,
+};
+
+enum xeonsp_fast_boot_mode get_fast_boot_mode(void);
+
 #endif