// SPDX-License-Identifier: GPL-2.0-only
/*
 *
 * Parts of this file are based on Ralink's 2.6.21 BSP
 *
 * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
 * Copyright (C) 2013 John Crispin <john@phrozen.org>
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/bug.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>

#include <asm/io.h>
#include <asm/mipsregs.h>
#include <asm/mach-ralink/ralink_regs.h>
#include <asm/mach-ralink/rt305x.h>

#include "common.h"

static struct ralink_soc_info *soc_info_ptr;

static unsigned long rt5350_get_mem_size(void)
{
        unsigned long ret;
        u32 t;

        t = __raw_readl(RT305X_SYSC_BASE + SYSC_REG_SYSTEM_CONFIG);
        t = (t >> RT5350_SYSCFG0_DRAM_SIZE_SHIFT) &
                RT5350_SYSCFG0_DRAM_SIZE_MASK;

        switch (t) {
        case RT5350_SYSCFG0_DRAM_SIZE_2M:
                ret = 2;
                break;
        case RT5350_SYSCFG0_DRAM_SIZE_8M:
                ret = 8;
                break;
        case RT5350_SYSCFG0_DRAM_SIZE_16M:
                ret = 16;
                break;
        case RT5350_SYSCFG0_DRAM_SIZE_32M:
                ret = 32;
                break;
        case RT5350_SYSCFG0_DRAM_SIZE_64M:
                ret = 64;
                break;
        default:
                panic("rt5350: invalid DRAM size: %u", t);
                break;
        }

        return ret;
}

static unsigned int __init rt305x_get_soc_name0(void)
{
        return __raw_readl(RT305X_SYSC_BASE + SYSC_REG_CHIP_NAME0);
}

static unsigned int __init rt305x_get_soc_name1(void)
{
        return __raw_readl(RT305X_SYSC_BASE + SYSC_REG_CHIP_NAME1);
}

static bool __init rt3052_soc_valid(void)
{
        if (rt305x_get_soc_name0() == RT3052_CHIP_NAME0 &&
            rt305x_get_soc_name1() == RT3052_CHIP_NAME1)
                return true;
        else
                return false;
}

static bool __init rt3350_soc_valid(void)
{
        if (rt305x_get_soc_name0() == RT3350_CHIP_NAME0 &&
            rt305x_get_soc_name1() == RT3350_CHIP_NAME1)
                return true;
        else
                return false;
}

static bool __init rt3352_soc_valid(void)
{
        if (rt305x_get_soc_name0() == RT3352_CHIP_NAME0 &&
            rt305x_get_soc_name1() == RT3352_CHIP_NAME1)
                return true;
        else
                return false;
}

static bool __init rt5350_soc_valid(void)
{
        if (rt305x_get_soc_name0() == RT5350_CHIP_NAME0 &&
            rt305x_get_soc_name1() == RT5350_CHIP_NAME1)
                return true;
        else
                return false;
}

static const char __init *rt305x_get_soc_name(struct ralink_soc_info *soc_info)
{
        if (rt3052_soc_valid()) {
                unsigned long icache_sets;

                icache_sets = (read_c0_config1() >> 22) & 7;
                if (icache_sets == 1) {
                        ralink_soc = RT305X_SOC_RT3050;
                        soc_info->compatible = "ralink,rt3050-soc";
                        return "RT3050";
                } else {
                        ralink_soc = RT305X_SOC_RT3052;
                        soc_info->compatible = "ralink,rt3052-soc";
                        return "RT3052";
                }
        } else if (rt3350_soc_valid()) {
                ralink_soc = RT305X_SOC_RT3350;
                soc_info->compatible = "ralink,rt3350-soc";
                return "RT3350";
        } else if (rt3352_soc_valid()) {
                ralink_soc = RT305X_SOC_RT3352;
                soc_info->compatible = "ralink,rt3352-soc";
                return "RT3352";
        } else if (rt5350_soc_valid()) {
                ralink_soc = RT305X_SOC_RT5350;
                soc_info->compatible = "ralink,rt5350-soc";
                return "RT5350";
        } else {
                panic("rt305x: unknown SoC, n0:%08x n1:%08x",
                      rt305x_get_soc_name0(), rt305x_get_soc_name1());
        }
}

static unsigned int __init rt305x_get_soc_id(void)
{
        return __raw_readl(RT305X_SYSC_BASE + SYSC_REG_CHIP_ID);
}

static unsigned int __init rt305x_get_soc_ver(void)
{
        return (rt305x_get_soc_id() >> CHIP_ID_ID_SHIFT) & CHIP_ID_ID_MASK;
}

static unsigned int __init rt305x_get_soc_rev(void)
{
        return (rt305x_get_soc_id() & CHIP_ID_REV_MASK);
}

static const char __init *rt305x_get_soc_id_name(void)
{
        if (soc_is_rt3050())
                return "rt3050";
        else if (soc_is_rt3052())
                return "rt3052";
        else if (soc_is_rt3350())
                return "rt3350";
        else if (soc_is_rt3352())
                return "rt3352";
        else if (soc_is_rt5350())
                return "rt5350";
        else
                return "invalid";
}

static int __init rt305x_soc_dev_init(void)
{
        struct soc_device *soc_dev;
        struct soc_device_attribute *soc_dev_attr;

        soc_dev_attr = kzalloc_obj(*soc_dev_attr);
        if (!soc_dev_attr)
                return -ENOMEM;

        soc_dev_attr->family = "Ralink";
        soc_dev_attr->soc_id = rt305x_get_soc_id_name();

        soc_dev_attr->data = soc_info_ptr;

        soc_dev = soc_device_register(soc_dev_attr);
        if (IS_ERR(soc_dev)) {
                kfree(soc_dev_attr);
                return PTR_ERR(soc_dev);
        }

        return 0;
}
device_initcall(rt305x_soc_dev_init);

void __init prom_soc_init(struct ralink_soc_info *soc_info)
{
        const char *name = rt305x_get_soc_name(soc_info);

        snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN,
                "Ralink %s id:%u rev:%u",
                name,
                rt305x_get_soc_ver(),
                rt305x_get_soc_rev());

        soc_info->mem_base = RT305X_SDRAM_BASE;
        if (soc_is_rt5350()) {
                soc_info->mem_size = rt5350_get_mem_size();
        } else if (soc_is_rt305x() || soc_is_rt3350()) {
                soc_info->mem_size_min = RT305X_MEM_SIZE_MIN;
                soc_info->mem_size_max = RT305X_MEM_SIZE_MAX;
        } else if (soc_is_rt3352()) {
                soc_info->mem_size_min = RT3352_MEM_SIZE_MIN;
                soc_info->mem_size_max = RT3352_MEM_SIZE_MAX;
        }

        soc_info_ptr = soc_info;
}