// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Freescale QorIQ Platforms GUTS Driver
 *
 * Copyright (C) 2016 Freescale Semiconductor, Inc.
 */

#include <linux/io.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/of_fdt.h>
#include <linux/sys_soc.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/fsl/guts.h>

struct fsl_soc_die_attr {
        char    *die;
        u32     svr;
        u32     mask;
};

struct fsl_soc_data {
        const char *sfp_compat;
        u32 uid_offset;
};

/* SoC die attribute definition for QorIQ platform */
static const struct fsl_soc_die_attr fsl_soc_die[] = {
        /*
         * Power Architecture-based SoCs T Series
         */

        /* Die: T4240, SoC: T4240/T4160/T4080 */
        { .die          = "T4240",
          .svr          = 0x82400000,
          .mask         = 0xfff00000,
        },
        /* Die: T1040, SoC: T1040/T1020/T1042/T1022 */
        { .die          = "T1040",
          .svr          = 0x85200000,
          .mask         = 0xfff00000,
        },
        /* Die: T2080, SoC: T2080/T2081 */
        { .die          = "T2080",
          .svr          = 0x85300000,
          .mask         = 0xfff00000,
        },
        /* Die: T1024, SoC: T1024/T1014/T1023/T1013 */
        { .die          = "T1024",
          .svr          = 0x85400000,
          .mask         = 0xfff00000,
        },

        /*
         * ARM-based SoCs LS Series
         */

        /* Die: LS1043A, SoC: LS1043A/LS1023A */
        { .die          = "LS1043A",
          .svr          = 0x87920000,
          .mask         = 0xffff0000,
        },
        /* Die: LS2080A, SoC: LS2080A/LS2040A/LS2085A */
        { .die          = "LS2080A",
          .svr          = 0x87010000,
          .mask         = 0xff3f0000,
        },
        /* Die: LS1088A, SoC: LS1088A/LS1048A/LS1084A/LS1044A */
        { .die          = "LS1088A",
          .svr          = 0x87030000,
          .mask         = 0xff3f0000,
        },
        /* Die: LS1012A, SoC: LS1012A */
        { .die          = "LS1012A",
          .svr          = 0x87040000,
          .mask         = 0xffff0000,
        },
        /* Die: LS1046A, SoC: LS1046A/LS1026A */
        { .die          = "LS1046A",
          .svr          = 0x87070000,
          .mask         = 0xffff0000,
        },
        /* Die: LS2088A, SoC: LS2088A/LS2048A/LS2084A/LS2044A */
        { .die          = "LS2088A",
          .svr          = 0x87090000,
          .mask         = 0xff3f0000,
        },
        /* Die: LS1021A, SoC: LS1021A/LS1020A/LS1022A */
        { .die          = "LS1021A",
          .svr          = 0x87000000,
          .mask         = 0xfff70000,
        },
        /* Die: LX2160A, SoC: LX2160A/LX2120A/LX2080A */
        { .die          = "LX2160A",
          .svr          = 0x87360000,
          .mask         = 0xff3f0000,
        },
        /* Die: LS1028A, SoC: LS1028A */
        { .die          = "LS1028A",
          .svr          = 0x870b0000,
          .mask         = 0xff3f0000,
        },
        { },
};

static const struct fsl_soc_die_attr *fsl_soc_die_match(
        u32 svr, const struct fsl_soc_die_attr *matches)
{
        while (matches->svr) {
                if (matches->svr == (svr & matches->mask))
                        return matches;
                matches++;
        }
        return NULL;
}

static u64 fsl_guts_get_soc_uid(const char *compat, unsigned int offset)
{
        struct device_node *np;
        void __iomem *sfp_base;
        u64 uid;

        np = of_find_compatible_node(NULL, NULL, compat);
        if (!np)
                return 0;

        sfp_base = of_iomap(np, 0);
        if (!sfp_base) {
                of_node_put(np);
                return 0;
        }

        uid = ioread32(sfp_base + offset);
        uid <<= 32;
        uid |= ioread32(sfp_base + offset + 4);

        iounmap(sfp_base);
        of_node_put(np);

        return uid;
}

static const struct fsl_soc_data ls1028a_data = {
        .sfp_compat = "fsl,ls1028a-sfp",
        .uid_offset = 0x21c,
};

/*
 * Table for matching compatible strings, for device tree
 * guts node, for Freescale QorIQ SOCs.
 */
static const struct of_device_id fsl_guts_of_match[] = {
        { .compatible = "fsl,qoriq-device-config-1.0", },
        { .compatible = "fsl,qoriq-device-config-2.0", },
        { .compatible = "fsl,p1010-guts", },
        { .compatible = "fsl,p1020-guts", },
        { .compatible = "fsl,p1021-guts", },
        { .compatible = "fsl,p1022-guts", },
        { .compatible = "fsl,p1023-guts", },
        { .compatible = "fsl,p2020-guts", },
        { .compatible = "fsl,bsc9131-guts", },
        { .compatible = "fsl,bsc9132-guts", },
        { .compatible = "fsl,mpc8536-guts", },
        { .compatible = "fsl,mpc8544-guts", },
        { .compatible = "fsl,mpc8548-guts", },
        { .compatible = "fsl,mpc8568-guts", },
        { .compatible = "fsl,mpc8569-guts", },
        { .compatible = "fsl,mpc8572-guts", },
        { .compatible = "fsl,ls1021a-dcfg", },
        { .compatible = "fsl,ls1043a-dcfg", },
        { .compatible = "fsl,ls2080a-dcfg", },
        { .compatible = "fsl,ls1088a-dcfg", },
        { .compatible = "fsl,ls1012a-dcfg", },
        { .compatible = "fsl,ls1046a-dcfg", },
        { .compatible = "fsl,lx2160a-dcfg", },
        { .compatible = "fsl,ls1028a-dcfg", .data = &ls1028a_data},
        {}
};

static int __init fsl_guts_init(void)
{
        struct soc_device_attribute *soc_dev_attr;
        static struct soc_device *soc_dev;
        const struct fsl_soc_die_attr *soc_die;
        const struct fsl_soc_data *soc_data;
        const struct of_device_id *match;
        struct ccsr_guts __iomem *regs;
        const char *machine = NULL;
        struct device_node *np;
        bool little_endian;
        u64 soc_uid = 0;
        u32 svr;
        int ret;

        np = of_find_matching_node_and_match(NULL, fsl_guts_of_match, &match);
        if (!np)
                return 0;
        soc_data = match->data;

        regs = of_iomap(np, 0);
        if (!regs) {
                of_node_put(np);
                return -ENOMEM;
        }

        little_endian = of_property_read_bool(np, "little-endian");
        if (little_endian)
                svr = ioread32(&regs->svr);
        else
                svr = ioread32be(&regs->svr);
        iounmap(regs);
        of_node_put(np);

        /* Register soc device */
        soc_dev_attr = kzalloc_obj(*soc_dev_attr);
        if (!soc_dev_attr)
                return -ENOMEM;

        if (of_property_read_string(of_root, "model", &machine))
                of_property_read_string_index(of_root, "compatible", 0, &machine);
        if (machine) {
                soc_dev_attr->machine = kstrdup(machine, GFP_KERNEL);
                if (!soc_dev_attr->machine)
                        goto err_nomem;
        }

        soc_die = fsl_soc_die_match(svr, fsl_soc_die);
        if (soc_die) {
                soc_dev_attr->family = kasprintf(GFP_KERNEL, "QorIQ %s",
                                                 soc_die->die);
        } else {
                soc_dev_attr->family = kasprintf(GFP_KERNEL, "QorIQ");
        }
        if (!soc_dev_attr->family)
                goto err_nomem;

        soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "svr:0x%08x", svr);
        if (!soc_dev_attr->soc_id)
                goto err_nomem;

        soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%d.%d",
                                           (svr >>  4) & 0xf, svr & 0xf);
        if (!soc_dev_attr->revision)
                goto err_nomem;

        if (soc_data)
                soc_uid = fsl_guts_get_soc_uid(soc_data->sfp_compat,
                                               soc_data->uid_offset);
        if (soc_uid)
                soc_dev_attr->serial_number = kasprintf(GFP_KERNEL, "%016llX",
                                                        soc_uid);

        soc_dev = soc_device_register(soc_dev_attr);
        if (IS_ERR(soc_dev)) {
                ret = PTR_ERR(soc_dev);
                goto err;
        }

        pr_info("Machine: %s\n", soc_dev_attr->machine);
        pr_info("SoC family: %s\n", soc_dev_attr->family);
        pr_info("SoC ID: %s, Revision: %s\n",
                soc_dev_attr->soc_id, soc_dev_attr->revision);

        return 0;

err_nomem:
        ret = -ENOMEM;
err:
        kfree(soc_dev_attr->machine);
        kfree(soc_dev_attr->family);
        kfree(soc_dev_attr->soc_id);
        kfree(soc_dev_attr->revision);
        kfree(soc_dev_attr->serial_number);
        kfree(soc_dev_attr);

        return ret;
}
core_initcall(fsl_guts_init);