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/* SPDX-License-Identifier: GPL-2.0-only */
#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 u16 rd_mbox_sts(struct pspv2_mbox *mbox)
{
union {
u32 val;
struct pspv2_mbox_cmd_fields fields;
} tmp = { 0 };
tmp.val = read32(&mbox->val);
return tmp.fields.mbox_status;
}
static void wr_mbox_cmd(struct pspv2_mbox *mbox, u8 cmd)
{
union {
u32 val;
struct pspv2_mbox_cmd_fields fields;
} tmp = { 0 };
/* Write entire 32-bit area to begin command execution */
tmp.fields.mbox_command = cmd;
write32(&mbox->val, tmp.val);
}
static u8 rd_mbox_recovery(struct pspv2_mbox *mbox)
{
union {
u32 val;
struct pspv2_mbox_cmd_fields fields;
} tmp = { 0 };
tmp.val = read32(&mbox->val);
return !!tmp.fields.recovery;
}
static void wr_mbox_cmd_resp(struct pspv2_mbox *mbox, void *buffer)
{
write64(&mbox->cmd_response, (uintptr_t)buffer);
}
static int wait_command(struct pspv2_mbox *mbox, bool wait_for_ready)
{
struct pspv2_mbox and_mask = { .val = ~0 };
struct pspv2_mbox expected = { .val = 0 };
struct stopwatch sw;
u32 tmp;
/* Zero fields from and_mask that should be kept */
and_mask.fields.mbox_command = 0;
and_mask.fields.ready = wait_for_ready ? 0 : 1;
/* Expect mbox_cmd == 0 but ready depends */
if (wait_for_ready)
expected.fields.ready = 1;
stopwatch_init_msecs_expire(&sw, PSP_CMD_TIMEOUT);
do {
tmp = read32(&mbox->val);
tmp &= ~and_mask.val;
if (tmp == expected.val)
return 0;
} while (!stopwatch_expired(&sw));
return -PSPSTS_CMD_TIMEOUT;
}
int send_psp_command(u32 command, void *buffer)
{
struct pspv2_mbox *mbox = soc_get_mbox_address();
if (!mbox)
return -PSPSTS_NOBASE;
if (rd_mbox_recovery(mbox))
return -PSPSTS_RECOVERY;
if (wait_command(mbox, true))
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. All commands except
* SxInfo set the Ready bit. */
if (wait_command(mbox, command != MBOX_BIOS_CMD_SX_INFO))
return -PSPSTS_CMD_TIMEOUT;
/* check delivery status */
if (rd_mbox_sts(mbox))
return -PSPSTS_SEND_ERROR;
return 0;
}
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