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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <device/mmio.h>
#include <cpu/x86/msr.h>
#include <timer.h>
#include <bootstate.h>
#include <console/console.h>
#include <amdblocks/psp.h>
#include <soc/iomap.h>
#include <soc/northbridge.h>
#include "psp_def.h"
static const char *psp_status_nobase = "error: 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_DEBUG, "%s\n", status_to_string(cmd_status));
else
printk(BIOS_DEBUG, "OK\n");
}
/*
* Notify the PSP that DRAM is present. Upon receiving this command, the PSP
* will load its OS into fenced DRAM that is not accessible to the x86 cores.
*/
int psp_notify_dram(void)
{
int cmd_status;
struct mbox_default_buffer buffer = {
.header = {
.size = sizeof(buffer)
}
};
printk(BIOS_DEBUG, "PSP: Notify that DRAM is available... ");
cmd_status = send_psp_command(MBOX_BIOS_CMD_DRAM_INFO, &buffer);
/* buffer's status shouldn't change but report it if it does */
psp_print_cmd_status(cmd_status, &buffer.header);
return cmd_status;
}
/*
* 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);
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