// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *  DRAM access routines
 */

#include <linux/time.h>
#include <sound/core.h>
#include <sound/gus.h>
#include <sound/info.h>


static int snd_gus_dram_poke(struct snd_gus_card *gus, char __user *_buffer,
                             unsigned int address, unsigned int size)
{
        unsigned int size1, size2;
        char buffer[256], *pbuffer;

        while (size > 0) {
                size1 = size > sizeof(buffer) ? sizeof(buffer) : size;
                if (copy_from_user(buffer, _buffer, size1))
                        return -EFAULT;
                if (gus->interwave) {
                        guard(spinlock_irqsave)(&gus->reg_lock);
                        snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);
                        snd_gf1_dram_addr(gus, address);
                        outsb(GUSP(gus, DRAM), buffer, size1);
                        address += size1;
                } else {
                        pbuffer = buffer;
                        size2 = size1;
                        while (size2--)
                                snd_gf1_poke(gus, address++, *pbuffer++);
                }
                size -= size1;
                _buffer += size1;
        }
        return 0;
}


int snd_gus_dram_write(struct snd_gus_card *gus, char __user *buffer,
                       unsigned int address, unsigned int size)
{
        return snd_gus_dram_poke(gus, buffer, address, size);
}

static int snd_gus_dram_peek(struct snd_gus_card *gus, char __user *_buffer,
                             unsigned int address, unsigned int size,
                             int rom)
{
        unsigned int size1, size2;
        char buffer[256], *pbuffer;

        while (size > 0) {
                size1 = size > sizeof(buffer) ? sizeof(buffer) : size;
                if (gus->interwave) {
                        guard(spinlock_irqsave)(&gus->reg_lock);
                        snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, rom ? 0x03 : 0x01);
                        snd_gf1_dram_addr(gus, address);
                        insb(GUSP(gus, DRAM), buffer, size1);
                        snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);
                        address += size1;
                } else {
                        pbuffer = buffer;
                        size2 = size1;
                        while (size2--)
                                *pbuffer++ = snd_gf1_peek(gus, address++);
                }
                if (copy_to_user(_buffer, buffer, size1))
                        return -EFAULT;
                size -= size1;
                _buffer += size1;
        }
        return 0;
}

int snd_gus_dram_read(struct snd_gus_card *gus, char __user *buffer,
                      unsigned int address, unsigned int size,
                      int rom)
{
        return snd_gus_dram_peek(gus, buffer, address, size, rom);
}