psp.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <device/mmio.h>
#include <bootstate.h>
#include <console/console.h>
#include <amdblocks/psp.h>
#include <soc/iomap.h>
#include "psp_def.h"
 
static const char *psp_status_nobase = "error: PSP_ADDR_MSR and PSP BAR3 not assigned";
static const char *psp_status_halted = "error: PSP in halted state";
static const char *psp_status_recovery = "error: PSP recovery required";
static const char *psp_status_errcmd = "error sending command";
static const char *psp_status_init_timeout = "error: PSP init timeout";
static const char *psp_status_cmd_timeout = "error: PSP command timeout";
static const char *psp_status_noerror = "";
 
static const char *status_to_string(int err)
{
        switch (err) {
        case -PSPSTS_NOBASE:
                return psp_status_nobase;
        case -PSPSTS_HALTED:
                return psp_status_halted;
        case -PSPSTS_RECOVERY:
                return psp_status_recovery;
        case -PSPSTS_SEND_ERROR:
                return psp_status_errcmd;
        case -PSPSTS_INIT_TIMEOUT:
                return psp_status_init_timeout;
        case -PSPSTS_CMD_TIMEOUT:
                return psp_status_cmd_timeout;
        default:
                return psp_status_noerror;
        }
}
 
static u32 rd_resp_sts(struct mbox_buffer_header *header)
{
        return read32(&header->status);
}
 
/*
 * Print meaningful status to the console.  Caller only passes a pointer to a
 * buffer header if it's expected to contain its own status.
 */
void psp_print_cmd_status(int cmd_status, struct mbox_buffer_header *header)
{
        if (header && rd_resp_sts(header))
                printk(BIOS_DEBUG, "buffer status=0x%x ", rd_resp_sts(header));
 
        if (cmd_status)
                printk(BIOS_WARNING, "%s\n", status_to_string(cmd_status));
        else
                printk(BIOS_DEBUG, "OK\n");
}
 
/*
 * Notify the PSP that the system is completing the boot process.  Upon
 * receiving this command, the PSP will only honor commands where the buffer
 * is in SMM space.
 */
static void psp_notify_boot_done(void *unused)
{
        int cmd_status;
        struct mbox_default_buffer buffer = {
                .header = {
                        .size = sizeof(buffer)
                }
        };
 
        printk(BIOS_DEBUG, "PSP: Notify that POST is finishing... ");
 
        cmd_status = send_psp_command(MBOX_BIOS_CMD_BOOT_DONE, &buffer);
 
        /* buffer's status shouldn't change but report it if it does */
        psp_print_cmd_status(cmd_status, &buffer.header);
}
 
BOOT_STATE_INIT_ENTRY(BS_PAYLOAD_BOOT, BS_ON_ENTRY, psp_notify_boot_done, NULL);