s3_resume.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <device/mmio.h>
#include <stage_cache.h>
#include <mrc_cache.h>
#include <reset.h>
#include <console/console.h>
#include <soc/southbridge.h>
#include <amdblocks/s3_resume.h>
#include <amdblocks/acpi.h>
 
/* Training data versioning is not supported or tracked. */
#define DEFAULT_MRC_VERSION 0
 
static void __noreturn reboot_from_resume(const char *message)
{
        printk(BIOS_ERR, "%s", message);
        set_pm1cnt_s5();
        board_reset();
}
 
AGESA_STATUS OemInitResume(S3_DATA_BLOCK *dataBlock)
{
        void *base;
        size_t size;
        int i;
        uint32_t erased = 0xffffffff;
 
        base = mrc_cache_current_mmap_leak(MRC_TRAINING_DATA,
                                           DEFAULT_MRC_VERSION,
                                           &size);
        if (!base || !size)
                reboot_from_resume("Error: S3 NV data not found, rebooting.\n");
 
        /* Read 16 bytes to infer if the NV has been erased from flash. */
        for (i = 0; i < 4; i++)
                erased &= read32((uint32_t *)base + i);
        if (erased == 0xffffffff)
                reboot_from_resume("Error: S3 NV data invalid, rebooting.\n");
 
        dataBlock->NvStorage = base;
        dataBlock->NvStorageSize = size;
        printk(BIOS_SPEW, "S3 NV data @%p, 0x%0zx bytes\n",
                dataBlock->NvStorage, (size_t)dataBlock->NvStorageSize);
 
        return AGESA_SUCCESS;
}
 
AGESA_STATUS OemS3LateRestore(S3_DATA_BLOCK *dataBlock)
{
        void *base = NULL;
        size_t size = 0;
 
        stage_cache_get_raw(STAGE_S3_DATA, &base, &size);
        if (!base || !size) {
                printk(BIOS_ERR, "S3 volatile data not found\n");
                return AGESA_FATAL;
        }
 
        dataBlock->VolatileStorage = base;
        dataBlock->VolatileStorageSize = size;
        printk(BIOS_SPEW, "S3 volatile data @%p, 0x%0zx bytes\n",
                dataBlock->VolatileStorage, (size_t)dataBlock->VolatileStorageSize);
 
        return AGESA_SUCCESS;
}
 
AGESA_STATUS OemS3Save(S3_DATA_BLOCK *dataBlock)
{
        if (mrc_cache_stash_data(MRC_TRAINING_DATA, DEFAULT_MRC_VERSION,
                        dataBlock->NvStorage, dataBlock->NvStorageSize) < 0) {
                printk(BIOS_ERR, "Failed to stash MRC data\n");
                return AGESA_CRITICAL;
        }
 
        stage_cache_add_raw(STAGE_S3_DATA, dataBlock->VolatileStorage,
                dataBlock->VolatileStorageSize);
 
        return AGESA_SUCCESS;
}