// SPDX-License-Identifier: GPL-2.0-only
/*
 * arch/sh/mm/cache-sh3.c
 *
 * Copyright (C) 1999, 2000  Niibe Yutaka
 * Copyright (C) 2002 Paul Mundt
 */

#include <linux/init.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/threads.h>
#include <asm/addrspace.h>
#include <asm/page.h>
#include <asm/processor.h>
#include <asm/cache.h>
#include <asm/io.h>
#include <linux/uaccess.h>
#include <asm/mmu_context.h>
#include <asm/cacheflush.h>

/*
 * Write back the dirty D-caches, but not invalidate them.
 *
 * Is this really worth it, or should we just alias this routine
 * to __flush_purge_region too?
 *
 * START: Virtual Address (U0, P1, or P3)
 * SIZE: Size of the region.
 */

static void sh3__flush_wback_region(void *start, int size)
{
        unsigned long v, j;
        unsigned long begin, end;
        unsigned long flags;

        begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
        end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
                & ~(L1_CACHE_BYTES-1);

        for (v = begin; v < end; v+=L1_CACHE_BYTES) {
                unsigned long addrstart = CACHE_OC_ADDRESS_ARRAY;
                for (j = 0; j < current_cpu_data.dcache.ways; j++) {
                        unsigned long data, addr, p;

                        p = __pa(v);
                        addr = addrstart | (v & current_cpu_data.dcache.entry_mask);
                        local_irq_save(flags);
                        data = __raw_readl(addr);

                        if ((data & CACHE_PHYSADDR_MASK) ==
                            (p & CACHE_PHYSADDR_MASK)) {
                                data &= ~SH_CACHE_UPDATED;
                                __raw_writel(data, addr);
                                local_irq_restore(flags);
                                break;
                        }
                        local_irq_restore(flags);
                        addrstart += current_cpu_data.dcache.way_incr;
                }
        }
}

/*
 * Write back the dirty D-caches and invalidate them.
 *
 * START: Virtual Address (U0, P1, or P3)
 * SIZE: Size of the region.
 */
static void sh3__flush_purge_region(void *start, int size)
{
        unsigned long v;
        unsigned long begin, end;

        begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
        end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
                & ~(L1_CACHE_BYTES-1);

        for (v = begin; v < end; v+=L1_CACHE_BYTES) {
                unsigned long data, addr;

                data = (v & 0xfffffc00); /* _Virtual_ address, ~U, ~V */
                addr = CACHE_OC_ADDRESS_ARRAY |
                        (v & current_cpu_data.dcache.entry_mask) | SH_CACHE_ASSOC;
                __raw_writel(data, addr);
        }
}

void __init sh3_cache_init(void)
{
        __flush_wback_region = sh3__flush_wback_region;
        __flush_purge_region = sh3__flush_purge_region;

        /*
         * No write back please
         *
         * Except I don't think there's any way to avoid the writeback.
         * So we just alias it to sh3__flush_purge_region(). dwmw2.
         */
        __flush_invalidate_region = sh3__flush_purge_region;
}