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/* SPDX-License-Identifier: GPL-2.0-only */
#include <timer.h>
#include <console/console.h>
#include <amdblocks/smn.h>
#include <amdblocks/smu.h>
#include <soc/smu.h>
#include <types.h>
#define SMU_MESG_RESP_TIMEOUT 0x00
#define SMU_MESG_RESP_OK 0x01
/* returns SMU_MESG_RESP_OK, SMU_MESG_RESP_TIMEOUT or a negative number */
static int32_t smu_poll_response(bool print_command_duration)
{
struct stopwatch sw;
const long timeout_ms = 10 * MSECS_PER_SEC;
int32_t result;
stopwatch_init_msecs_expire(&sw, timeout_ms);
do {
result = smn_read32(SMN_SMU_MESG_RESP);
if (result) {
if (print_command_duration)
printk(BIOS_SPEW, "SMU command consumed %ld usecs\n",
stopwatch_duration_usecs(&sw));
return result;
}
} while (!stopwatch_expired(&sw));
printk(BIOS_ERR, "timeout sending SMU message\n");
return SMU_MESG_RESP_TIMEOUT;
}
/*
* Send a message and bi-directional payload to the SMU. SMU response, if any, is returned via
* *arg.
*/
enum cb_err send_smu_message(enum smu_message_id message_id, struct smu_payload *arg)
{
size_t i;
/* wait until SMU can process a new request; don't care if an old request failed */
if (smu_poll_response(false) == SMU_MESG_RESP_TIMEOUT)
return CB_ERR;
/* clear response register */
smn_write32(SMN_SMU_MESG_RESP, 0);
/* populate arguments */
for (i = 0 ; i < SMU_NUM_ARGS ; i++)
smn_write32(SMN_SMU_MESG_ARG(i), arg->msg[i]);
/* send message to SMU */
smn_write32(SMN_SMU_MESG_ID, message_id);
/* wait until SMU has processed the message and check if it was successful */
if (smu_poll_response(true) != SMU_MESG_RESP_OK)
return CB_ERR;
/* copy returned values */
for (i = 0 ; i < SMU_NUM_ARGS ; i++)
arg->msg[i] = smn_read32(SMN_SMU_MESG_ARG(i));
return CB_SUCCESS;
}
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