plat/intel/soc/agilex/soc/agilex_mailbox.c

/*
 * Copyright (c) 2019, Intel Corporation. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <lib/mmio.h>
#include <common/debug.h>

#include "agilex_mailbox.h"

static int fill_mailbox_circular_buffer(uint32_t header_cmd, uint32_t *args,
					int len)
{
	uint32_t cmd_free_offset;
	int i;

	cmd_free_offset = mmio_read_32(MBOX_OFFSET + MBOX_CIN);

	if (cmd_free_offset >= MBOX_CMD_BUFFER_SIZE) {
		INFO("Insufficient buffer in mailbox\n");
		return MBOX_INSUFFICIENT_BUFFER;
	}


	mmio_write_32(MBOX_OFFSET + MBOX_CMD_BUFFER + (cmd_free_offset++ * 4),
			header_cmd);


	for (i = 0; i < len; i++) {
		cmd_free_offset %= MBOX_CMD_BUFFER_SIZE;
		mmio_write_32(MBOX_OFFSET + MBOX_CMD_BUFFER +
				(cmd_free_offset++ * 4), args[i]);
	}

	cmd_free_offset %= MBOX_CMD_BUFFER_SIZE;
	mmio_write_32(MBOX_OFFSET + MBOX_CIN, cmd_free_offset);

	return 0;
}

int mailbox_read_response(int job_id, uint32_t *response)
{
	int rin = 0;
	int rout = 0;
	int response_length = 0;
	int resp = 0;
	int total_resp_len = 0;
	int timeout = 100000;

	mmio_write_32(MBOX_OFFSET + MBOX_DOORBELL_TO_SDM, 1);

	while (mmio_read_32(MBOX_OFFSET + MBOX_DOORBELL_FROM_SDM) != 1) {
		if (timeout-- < 0)
			return MBOX_NO_RESPONSE;
	}

	mmio_write_32(MBOX_OFFSET + MBOX_DOORBELL_FROM_SDM, 0);

	rin = mmio_read_32(MBOX_OFFSET + MBOX_RIN);
	rout = mmio_read_32(MBOX_OFFSET + MBOX_ROUT);

	while (rout != rin) {
		resp = mmio_read_32(MBOX_OFFSET +
				    MBOX_RESP_BUFFER + ((rout++)*4));

		rout %= MBOX_RESP_BUFFER_SIZE;
		mmio_write_32(MBOX_OFFSET + MBOX_ROUT, rout);

		if (MBOX_RESP_CLIENT_ID(resp) != MBOX_ATF_CLIENT_ID ||
		   MBOX_RESP_JOB_ID(resp) != job_id) {
			return MBOX_WRONG_ID;
		}

		if (MBOX_RESP_ERR(resp) > 0) {
			INFO("Error in response: %x\n", resp);
			return -resp;
		}
		response_length = MBOX_RESP_LEN(resp);

		while (response_length) {

			response_length--;
			resp = mmio_read_32(MBOX_OFFSET +
						MBOX_RESP_BUFFER +
						(rout)*4);
			if (response) {
				*(response + total_resp_len) = resp;
				total_resp_len++;
			}
			rout++;
			rout %= MBOX_RESP_BUFFER_SIZE;
			mmio_write_32(MBOX_OFFSET + MBOX_ROUT, rout);
		}
		return total_resp_len;
	}

	return MBOX_NO_RESPONSE;
}


int mailbox_poll_response(int job_id, int urgent, uint32_t *response)
{
	int timeout = 80000;
	int rin = 0;
	int rout = 0;
	int response_length = 0;
	int resp = 0;
	int total_resp_len = 0;

	mmio_write_32(MBOX_OFFSET + MBOX_DOORBELL_TO_SDM, 1);

	while (1) {
		while (timeout > 0 &&
			mmio_read_32(MBOX_OFFSET +
				MBOX_DOORBELL_FROM_SDM) != 1) {
			timeout--;
		}

		if (mmio_read_32(MBOX_OFFSET + MBOX_DOORBELL_FROM_SDM) != 1) {
			INFO("Timed out waiting for SDM");
			return MBOX_TIMEOUT;
		}

		mmio_write_32(MBOX_OFFSET + MBOX_DOORBELL_FROM_SDM, 0);

		if (urgent & 1) {
			if ((mmio_read_32(MBOX_OFFSET + MBOX_STATUS) &
				MBOX_STATUS_UA_MASK) ^
				(urgent & MBOX_STATUS_UA_MASK)) {
				mmio_write_32(MBOX_OFFSET + MBOX_URG, 0);
				return 0;
			}

			mmio_write_32(MBOX_OFFSET + MBOX_URG, 0);
			INFO("Error: Mailbox did not get UA");
			return -1;
		}

		rin = mmio_read_32(MBOX_OFFSET + MBOX_RIN);
		rout = mmio_read_32(MBOX_OFFSET + MBOX_ROUT);

		while (rout != rin) {
			resp = mmio_read_32(MBOX_OFFSET +
					    MBOX_RESP_BUFFER + ((rout++)*4));

			rout %= MBOX_RESP_BUFFER_SIZE;
			mmio_write_32(MBOX_OFFSET + MBOX_ROUT, rout);

			if (MBOX_RESP_CLIENT_ID(resp) != MBOX_ATF_CLIENT_ID ||
			   MBOX_RESP_JOB_ID(resp) != job_id)
				continue;

			if (MBOX_RESP_ERR(resp) > 0) {
				INFO("Error in response: %x\n", resp);
				return -MBOX_RESP_ERR(resp);
			}
			response_length = MBOX_RESP_LEN(resp);

			while (response_length) {

				response_length--;
				resp = mmio_read_32(MBOX_OFFSET +
							MBOX_RESP_BUFFER +
							(rout)*4);
				if (response) {
					*(response + total_resp_len) = resp;
					total_resp_len++;
				}
				rout++;
				rout %= MBOX_RESP_BUFFER_SIZE;
				mmio_write_32(MBOX_OFFSET + MBOX_ROUT, rout);
			}
			return total_resp_len;
		}
	}
}

void mailbox_send_cmd_async(int job_id, unsigned int cmd, uint32_t *args,
			  int len, int urgent)
{
	if (urgent)
		mmio_write_32(MBOX_OFFSET + MBOX_URG, 1);

	fill_mailbox_circular_buffer(MBOX_CLIENT_ID_CMD(MBOX_ATF_CLIENT_ID) |
					MBOX_JOB_ID_CMD(job_id) |
					MBOX_CMD_LEN_CMD(len) |
					MBOX_INDIRECT |
					cmd, args, len);
}

int mailbox_send_cmd(int job_id, unsigned int cmd, uint32_t *args,
			  int len, int urgent, uint32_t *response)
{
	int status;

	if (urgent) {
		urgent |= mmio_read_32(MBOX_OFFSET + MBOX_STATUS) &
					MBOX_STATUS_UA_MASK;
		mmio_write_32(MBOX_OFFSET + MBOX_URG, cmd);
		status = 0;
	} else {
		status = fill_mailbox_circular_buffer(
			MBOX_CLIENT_ID_CMD(MBOX_ATF_CLIENT_ID) |
			MBOX_JOB_ID_CMD(job_id) |
			cmd, args, len);
	}

	if (status)
		return status;

	return mailbox_poll_response(job_id, urgent, response);
}

void mailbox_set_int(int interrupt)
{

	mmio_write_32(MBOX_OFFSET+MBOX_INT, MBOX_COE_BIT(interrupt) |
			MBOX_UAE_BIT(interrupt));
}


void mailbox_set_qspi_open(void)
{
	mailbox_set_int(MBOX_INT_FLAG_COE | MBOX_INT_FLAG_RIE);
	mailbox_send_cmd(MBOX_JOB_ID, MBOX_CMD_QSPI_OPEN, 0, 0, 0, 0);
}

void mailbox_set_qspi_direct(void)
{
	mailbox_send_cmd(MBOX_JOB_ID, MBOX_CMD_QSPI_DIRECT, 0, 0, 0, 0);
}

void mailbox_set_qspi_close(void)
{
	mailbox_set_int(MBOX_INT_FLAG_COE | MBOX_INT_FLAG_RIE);
	mailbox_send_cmd(MBOX_JOB_ID, MBOX_CMD_QSPI_CLOSE, 0, 0, 0, 0);
}

int mailbox_get_qspi_clock(void)
{
	mailbox_set_int(MBOX_INT_FLAG_COE | MBOX_INT_FLAG_RIE);
	return mailbox_send_cmd(MBOX_JOB_ID, MBOX_CMD_QSPI_DIRECT, 0, 0, 0, 0);
}

void mailbox_qspi_set_cs(int device_select)
{
	uint32_t cs_setting = device_select;

	/* QSPI device select settings at 31:28 */
	cs_setting = (cs_setting << 28);
	mailbox_set_int(MBOX_INT_FLAG_COE | MBOX_INT_FLAG_RIE);
	mailbox_send_cmd(MBOX_JOB_ID, MBOX_CMD_QSPI_SET_CS, &cs_setting,
		1, 0, 0);
}

void mailbox_reset_cold(void)
{
	mailbox_set_int(MBOX_INT_FLAG_COE | MBOX_INT_FLAG_RIE);
	mailbox_send_cmd(MBOX_JOB_ID, MBOX_CMD_REBOOT_HPS, 0, 0, 0, 0);
}

int mailbox_init(void)
{
	int status = 0;

	mailbox_set_int(MBOX_INT_FLAG_COE | MBOX_INT_FLAG_RIE |
			MBOX_INT_FLAG_UAE);
	mmio_write_32(MBOX_OFFSET + MBOX_URG, 0);
	mmio_write_32(MBOX_OFFSET + MBOX_DOORBELL_FROM_SDM, 0);
	status = mailbox_send_cmd(0, MBOX_CMD_RESTART, 0, 0, 1, 0);

	if (status)
		return status;

	mailbox_set_int(MBOX_INT_FLAG_COE | MBOX_INT_FLAG_RIE);

	return 0;
}