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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <device/mmio.h>
#include <timer.h>
#include <bootstate.h>
#include <amdblocks/psp.h>
#include <soc/iomap.h>
#include <soc/northbridge.h>
#include "psp_def.h"
static u32 rd_mbox_sts(struct pspv1_mbox *mbox)
{
return read32(&mbox->mbox_status);
}
static void wr_mbox_cmd(struct pspv1_mbox *mbox, u32 cmd)
{
write32(&mbox->mbox_command, cmd);
}
static u32 rd_mbox_cmd(struct pspv1_mbox *mbox)
{
return read32(&mbox->mbox_command);
}
static void wr_mbox_cmd_resp(struct pspv1_mbox *mbox, void *buffer)
{
write64(&mbox->cmd_response, (uintptr_t)buffer);
}
static int wait_initialized(struct pspv1_mbox *mbox)
{
struct stopwatch sw;
stopwatch_init_msecs_expire(&sw, PSP_INIT_TIMEOUT);
do {
if (rd_mbox_sts(mbox) & PSPV1_STATUS_INITIALIZED)
return 0;
} while (!stopwatch_expired(&sw));
return -PSPSTS_INIT_TIMEOUT;
}
static int wait_command(struct pspv1_mbox *mbox)
{
struct stopwatch sw;
stopwatch_init_msecs_expire(&sw, PSP_CMD_TIMEOUT);
do {
if (!rd_mbox_cmd(mbox))
return 0;
} while (!stopwatch_expired(&sw));
return -PSPSTS_CMD_TIMEOUT;
}
int send_psp_command(u32 command, void *buffer)
{
struct pspv1_mbox *mbox = soc_get_mbox_address();
if (!mbox)
return -PSPSTS_NOBASE;
/* check for PSP error conditions */
if (rd_mbox_sts(mbox) & PSPV1_STATUS_HALT)
return -PSPSTS_HALTED;
if (rd_mbox_sts(mbox) & PSPV1_STATUS_RECOVERY)
return -PSPSTS_RECOVERY;
/* PSP must be finished with init and ready to accept a command */
if (wait_initialized(mbox))
return -PSPSTS_INIT_TIMEOUT;
if (wait_command(mbox))
return -PSPSTS_CMD_TIMEOUT;
/* set address of command-response buffer and write command register */
wr_mbox_cmd_resp(mbox, buffer);
wr_mbox_cmd(mbox, command);
/* PSP clears command register when complete */
if (wait_command(mbox))
return -PSPSTS_CMD_TIMEOUT;
/* check delivery status */
if (rd_mbox_sts(mbox) & (PSPV1_STATUS_ERROR | PSPV1_STATUS_TERMINATED))
return -PSPSTS_SEND_ERROR;
return 0;
}
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