// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * MX31 CPU type detection
 *
 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
 */

#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/io.h>

#include "common.h"
#include "hardware.h"
#include "iim.h"

static int mx31_cpu_rev = -1;

static struct {
        u8 srev;
        const char *name;
        unsigned int rev;
} mx31_cpu_type[] = {
        { .srev = 0x00, .name = "i.MX31(L)", .rev = IMX_CHIP_REVISION_1_0 },
        { .srev = 0x10, .name = "i.MX31",    .rev = IMX_CHIP_REVISION_1_1 },
        { .srev = 0x11, .name = "i.MX31L",   .rev = IMX_CHIP_REVISION_1_1 },
        { .srev = 0x12, .name = "i.MX31",    .rev = IMX_CHIP_REVISION_1_1 },
        { .srev = 0x13, .name = "i.MX31L",   .rev = IMX_CHIP_REVISION_1_1 },
        { .srev = 0x14, .name = "i.MX31",    .rev = IMX_CHIP_REVISION_1_2 },
        { .srev = 0x15, .name = "i.MX31L",   .rev = IMX_CHIP_REVISION_1_2 },
        { .srev = 0x28, .name = "i.MX31",    .rev = IMX_CHIP_REVISION_2_0 },
        { .srev = 0x29, .name = "i.MX31L",   .rev = IMX_CHIP_REVISION_2_0 },
};

static int mx31_read_cpu_rev(void)
{
        void __iomem *iim_base;
        struct device_node *np;
        u32 i, srev;

        np = of_find_compatible_node(NULL, NULL, "fsl,imx31-iim");
        iim_base = of_iomap(np, 0);
        of_node_put(np);
        BUG_ON(!iim_base);

        /* read SREV register from IIM module */
        srev = imx_readl(iim_base + MXC_IIMSREV);
        srev &= 0xff;

        for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++)
                if (srev == mx31_cpu_type[i].srev) {
                        imx_print_silicon_rev(mx31_cpu_type[i].name,
                                                mx31_cpu_type[i].rev);
                        return mx31_cpu_type[i].rev;
                }

        imx_print_silicon_rev("i.MX31", IMX_CHIP_REVISION_UNKNOWN);
        return IMX_CHIP_REVISION_UNKNOWN;
}

int mx31_revision(void)
{
        if (mx31_cpu_rev == -1)
                mx31_cpu_rev = mx31_read_cpu_rev();

        return mx31_cpu_rev;
}
EXPORT_SYMBOL(mx31_revision);