plat/mediatek/mt8195/drivers/mcdi/mt_mcdi.c

/*
 * Copyright (c) 2021, MediaTek Inc. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <cdefs.h>
#include <common/debug.h>

#include <lib/mmio.h>
#include <lib/utils_def.h>
#include <mt_mcdi.h>

/* Read/Write */
#define APMCU_MCUPM_MBOX_AP_READY	U(0)
#define APMCU_MCUPM_MBOX_RESERVED_1	U(1)
#define APMCU_MCUPM_MBOX_RESERVED_2	U(2)
#define APMCU_MCUPM_MBOX_RESERVED_3	U(3)
#define APMCU_MCUPM_MBOX_PWR_CTRL_EN	U(4)
#define APMCU_MCUPM_MBOX_L3_CACHE_MODE	U(5)
#define APMCU_MCUPM_MBOX_BUCK_MODE	U(6)
#define APMCU_MCUPM_MBOX_ARMPLL_MODE	U(7)
/* Read only */
#define APMCU_MCUPM_MBOX_TASK_STA	U(8)
#define APMCU_MCUPM_MBOX_RESERVED_9	U(9)
#define APMCU_MCUPM_MBOX_RESERVED_10	U(10)
#define APMCU_MCUPM_MBOX_RESERVED_11	U(11)

/* CPC mode - Read/Write */
#define APMCU_MCUPM_MBOX_WAKEUP_CPU	U(12)

/* Mbox Slot: APMCU_MCUPM_MBOX_PWR_CTRL_EN */
#define MCUPM_MCUSYS_CTRL		BIT(0)
#define MCUPM_BUCK_CTRL			BIT(1)
#define MCUPM_ARMPLL_CTRL		BIT(2)
#define MCUPM_CM_CTRL			BIT(3)
#define MCUPM_PWR_CTRL_MASK		GENMASK(3, 0)

/* Mbox Slot: APMCU_MCUPM_MBOX_BUCK_MODE */
#define MCUPM_BUCK_NORMAL_MODE		U(0) /* default */
#define MCUPM_BUCK_LP_MODE		U(1)
#define MCUPM_BUCK_OFF_MODE		U(2)
#define NF_MCUPM_BUCK_MODE		U(3)

/* Mbox Slot: APMCU_MCUPM_MBOX_ARMPLL_MODE */
#define MCUPM_ARMPLL_ON			U(0) /* default */
#define MCUPM_ARMPLL_GATING		U(1)
#define MCUPM_ARMPLL_OFF		U(2)
#define NF_MCUPM_ARMPLL_MODE		U(3)

/* Mbox Slot: APMCU_MCUPM_MBOX_TASK_STA */
#define MCUPM_TASK_UNINIT		U(0)
#define MCUPM_TASK_INIT			U(1)
#define MCUPM_TASK_INIT_FINISH		U(2)
#define MCUPM_TASK_WAIT			U(3)
#define MCUPM_TASK_RUN			U(4)
#define MCUPM_TASK_PAUSE		U(5)

#define SSPM_MBOX_3_BASE		U(0x0c55fce0)

#define MCDI_NOT_INIT			0
#define MCDI_INIT_1			1
#define MCDI_INIT_2			2
#define MCDI_INIT_DONE			3

static int mcdi_init_status __section("tzfw_coherent_mem");

static inline uint32_t mcdi_mbox_read(uint32_t id)
{
	return mmio_read_32(SSPM_MBOX_3_BASE + (id << 2));
}

static inline void mcdi_mbox_write(uint32_t id, uint32_t val)
{
	mmio_write_32(SSPM_MBOX_3_BASE + (id << 2), val);
}

static void mtk_mcupm_pwr_ctrl_setting(uint32_t dev)
{
	mcdi_mbox_write(APMCU_MCUPM_MBOX_PWR_CTRL_EN, dev);
}

static void mtk_set_mcupm_pll_mode(uint32_t mode)
{
	if (mode < NF_MCUPM_ARMPLL_MODE) {
		mcdi_mbox_write(APMCU_MCUPM_MBOX_ARMPLL_MODE, mode);
	}
}

static void mtk_set_mcupm_buck_mode(uint32_t mode)
{
	if (mode < NF_MCUPM_BUCK_MODE) {
		mcdi_mbox_write(APMCU_MCUPM_MBOX_BUCK_MODE, mode);
	}
}

static int mtk_mcupm_is_ready(void)
{
	unsigned int sta = mcdi_mbox_read(APMCU_MCUPM_MBOX_TASK_STA);

	return (sta == MCUPM_TASK_WAIT) || (sta == MCUPM_TASK_INIT_FINISH);
}

static int mcdi_init_1(void)
{
	unsigned int sta = mcdi_mbox_read(APMCU_MCUPM_MBOX_TASK_STA);

	if (sta != MCUPM_TASK_INIT) {
		return -1;
	}

	mtk_set_mcupm_pll_mode(MCUPM_ARMPLL_OFF);
	mtk_set_mcupm_buck_mode(MCUPM_BUCK_OFF_MODE);

	mtk_mcupm_pwr_ctrl_setting(
			 MCUPM_MCUSYS_CTRL |
			 MCUPM_BUCK_CTRL |
			 MCUPM_ARMPLL_CTRL);

	mcdi_mbox_write(APMCU_MCUPM_MBOX_AP_READY, 1);

	return 0;
}

static int mcdi_init_2(void)
{
	return mtk_mcupm_is_ready() ? 0 : -1;
}

int mcdi_try_init(void)
{
	if (mcdi_init_status == MCDI_INIT_DONE) {
		return 0;
	}

	if (mcdi_init_status == MCDI_NOT_INIT) {
		mcdi_init_status = MCDI_INIT_1;
	}

	if (mcdi_init_status == MCDI_INIT_1 && mcdi_init_1() == 0) {
		mcdi_init_status = MCDI_INIT_2;
	}

	if (mcdi_init_status == MCDI_INIT_2 && mcdi_init_2() == 0) {
		mcdi_init_status = MCDI_INIT_DONE;
	}

	INFO("mcdi ready for mcusys-off-idle and system suspend\n");

	return (mcdi_init_status == MCDI_INIT_DONE) ? 0 : mcdi_init_status;
}