xref: /rk3399_ARM-atf/plat/intel/soc/common/drivers/combophy/combophy.c (revision c6b2bb999944b065c3225a2ea61350598ee1a6a0)

/*
 * Copyright (c) 2022-2023, Intel Corporation. All rights reserved.
 * Copyright (c) 2025, Altera Corporation. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <assert.h>
#include <errno.h>
#include <stdbool.h>
#include <string.h>

#include <arch_helpers.h>
#include <common/debug.h>
#include <drivers/cadence/cdns_sdmmc.h>
#include <drivers/delay_timer.h>
#include <lib/mmio.h>
#include <lib/utils.h>

#include "combophy.h"
#include "sdmmc/sdmmc.h"

/* DFI configuration */
int dfi_select(handoff *hoff_ptr)
{
	uint32_t reg = 0;
	uint32_t active_dfi_intf = DFI_CTRL_SEL_HPNFC;

	INFO("Power gate enable hand-off: 0x%08x\n", hoff_ptr->peripheral_pwr_gate_array);

	if (hoff_ptr->peripheral_pwr_gate_array & POWER_GATE_EN_SDEMMC) {
		INFO("SDEMMC power gate enabled, DFI selected to NAND\n");
		/*
		 * SDEMMC power gate enabled.
		 * This means SDEMMC controller is disabled and active DFI
		 * interface is selected to NAND via System manager.
		 */
		active_dfi_intf = DFI_CTRL_SEL_HPNFC;
	} else if (hoff_ptr->peripheral_pwr_gate_array & POWER_GATE_EN_NAND) {
		INFO("NAND power gate enabled, DFI selected to SDEMMC\n");
		/*
		 * NAND power gate enabled.
		 * This means NAND controller is disabled and active DFI
		 * interface is selected to SDEMMC via System manager.
		 */
		active_dfi_intf = DFI_CTRL_SEL_SDEMMC;
	} else {
		WARN("Neither SDEMMC nor NAND power gate enabled, by def DFI sel to NAND\n");
	}

	/* Configure the DFI interface select via System manager. */
	mmio_setbits_32(SOCFPGA_SYSMGR(DFI_INTF), active_dfi_intf);

	/* Read back and confirm the same.*/
	reg = mmio_read_32(SOCFPGA_SYSMGR(DFI_INTF));
	if ((reg & DFI_INTF_MASK) != active_dfi_intf) {
		ERROR("DFI interface select failed, expected: 0x%08x, got: 0x%08x\n",
			active_dfi_intf, (reg & DFI_INTF_MASK));
		return -ENXIO;
	} else {
		NOTICE("DFI interface selected successfully to %s\n",
			(reg & DFI_INTF_MASK) == DFI_CTRL_SEL_HPNFC ?
			"NAND" : "SDEMMC");
	}

	return 0;
}

int combo_phy_init(handoff *hoff_ptr)
{
	/* SDMMC/NAND DFI selection based on system manager DFI register */
	int ret = dfi_select(hoff_ptr);

	if (ret != 0U) {
		ERROR("DFI configuration failed\n");
		return ret;
	}

	return 0;
}