// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2016 Freescale Semiconductor, Inc.
 * Copyright 2017-2018 NXP
 *   Author: Dong Aisheng <aisheng.dong@nxp.com>
 */

#include <linux/irqchip.h>
#include <linux/mfd/syscon.h>
#include <linux/of_platform.h>
#include <linux/regmap.h>
#include <asm/mach/arch.h>

#include "common.h"
#include "cpuidle.h"
#include "hardware.h"

#define SIM_JTAG_ID_REG         0x8c

static void __init imx7ulp_set_revision(void)
{
        struct regmap *sim;
        u32 revision;

        sim = syscon_regmap_lookup_by_compatible("fsl,imx7ulp-sim");
        if (IS_ERR(sim)) {
                pr_warn("failed to find fsl,imx7ulp-sim regmap!\n");
                return;
        }

        if (regmap_read(sim, SIM_JTAG_ID_REG, &revision)) {
                pr_warn("failed to read sim regmap!\n");
                return;
        }

        /*
         * bit[31:28] of JTAG_ID register defines revision as below from B0:
         * 0001        B0
         * 0010        B1
         * 0011        B2
         */
        switch (revision >> 28) {
        case 1:
                imx_set_soc_revision(IMX_CHIP_REVISION_2_0);
                break;
        case 2:
                imx_set_soc_revision(IMX_CHIP_REVISION_2_1);
                break;
        case 3:
                imx_set_soc_revision(IMX_CHIP_REVISION_2_2);
                break;
        default:
                imx_set_soc_revision(IMX_CHIP_REVISION_1_0);
                break;
        }
}

static void __init imx7ulp_init_machine(void)
{
        imx7ulp_pm_init();

        mxc_set_cpu_type(MXC_CPU_IMX7ULP);
        imx7ulp_set_revision();
        of_platform_default_populate(NULL, NULL, NULL);
}

static const char *const imx7ulp_dt_compat[] __initconst = {
        "fsl,imx7ulp",
        NULL,
};

static void __init imx7ulp_init_late(void)
{
        if (IS_ENABLED(CONFIG_ARM_IMX_CPUFREQ_DT))
                platform_device_register_simple("imx-cpufreq-dt", -1, NULL, 0);

        imx7ulp_cpuidle_init();
}

DT_MACHINE_START(IMX7ulp, "Freescale i.MX7ULP (Device Tree)")
        .init_machine   = imx7ulp_init_machine,
        .dt_compat      = imx7ulp_dt_compat,
        .init_late      = imx7ulp_init_late,
MACHINE_END