// SPDX-License-Identifier: GPL-2.0-only
/*
 *
 * Copyright (C) 2012 Thomas Langer <thomas.langer@lantiq.com>
 * Copyright (C) 2012 John Crispin <john@phrozen.org>
 */

#include <linux/kernel.h>
#include <asm/cacheflush.h>
#include <asm/traps.h>
#include <asm/io.h>

#include <lantiq_soc.h>

#include "../prom.h"

#define SOC_FALCON      "Falcon"
#define SOC_FALCON_D    "Falcon-D"
#define SOC_FALCON_V    "Falcon-V"
#define SOC_FALCON_M    "Falcon-M"

#define COMP_FALCON     "lantiq,falcon"

#define PART_SHIFT      12
#define PART_MASK       0x0FFFF000
#define REV_SHIFT       28
#define REV_MASK        0xF0000000
#define SREV_SHIFT      22
#define SREV_MASK       0x03C00000
#define TYPE_SHIFT      26
#define TYPE_MASK       0x3C000000

/* reset, nmi and ejtag exception vectors */
#define BOOT_REG_BASE   (KSEG1 | 0x1F200000)
#define BOOT_RVEC       (BOOT_REG_BASE | 0x00)
#define BOOT_NVEC       (BOOT_REG_BASE | 0x04)
#define BOOT_EVEC       (BOOT_REG_BASE | 0x08)

static void __init ltq_soc_nmi_setup(void)
{
        extern void (*nmi_handler)(void);

        ltq_w32((unsigned long)&nmi_handler, (void *)BOOT_NVEC);
}

static void __init ltq_soc_ejtag_setup(void)
{
        extern void (*ejtag_debug_handler)(void);

        ltq_w32((unsigned long)&ejtag_debug_handler, (void *)BOOT_EVEC);
}

void __init ltq_soc_detect(struct ltq_soc_info *i)
{
        u32 type;
        i->partnum = (ltq_r32(FALCON_CHIPID) & PART_MASK) >> PART_SHIFT;
        i->rev = (ltq_r32(FALCON_CHIPID) & REV_MASK) >> REV_SHIFT;
        i->srev = ((ltq_r32(FALCON_CHIPCONF) & SREV_MASK) >> SREV_SHIFT);
        i->compatible = COMP_FALCON;
        i->type = SOC_TYPE_FALCON;
        sprintf(i->rev_type, "%c%d%d", (i->srev & 0x4) ? ('B') : ('A'),
                i->rev & 0x7, (i->srev & 0x3) + 1);

        switch (i->partnum) {
        case SOC_ID_FALCON:
                type = (ltq_r32(FALCON_CHIPTYPE) & TYPE_MASK) >> TYPE_SHIFT;
                switch (type) {
                case 0:
                        i->name = SOC_FALCON_D;
                        break;
                case 1:
                        i->name = SOC_FALCON_V;
                        break;
                case 2:
                        i->name = SOC_FALCON_M;
                        break;
                default:
                        i->name = SOC_FALCON;
                        break;
                }
                break;

        default:
                unreachable();
                break;
        }

        board_nmi_handler_setup = ltq_soc_nmi_setup;
        board_ejtag_handler_setup = ltq_soc_ejtag_setup;
}