// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *  I/O routines for GF1/InterWave synthesizer chips
 */

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

void snd_gf1_delay(struct snd_gus_card * gus)
{
        int i;

        for (i = 0; i < 6; i++) {
                mb();
                inb(GUSP(gus, DRAM));
        }
}

/*
 *  =======================================================================
 */

/*
 *  ok.. stop of control registers (wave & ramp) need some special things..
 *       big UltraClick (tm) elimination...
 */

static inline void __snd_gf1_ctrl_stop(struct snd_gus_card * gus, unsigned char reg)
{
        unsigned char value;

        outb(reg | 0x80, gus->gf1.reg_regsel);
        mb();
        value = inb(gus->gf1.reg_data8);
        mb();
        outb(reg, gus->gf1.reg_regsel);
        mb();
        outb((value | 0x03) & ~(0x80 | 0x20), gus->gf1.reg_data8);
        mb();
}

static inline void __snd_gf1_write8(struct snd_gus_card * gus,
                                    unsigned char reg,
                                    unsigned char data)
{
        outb(reg, gus->gf1.reg_regsel);
        mb();
        outb(data, gus->gf1.reg_data8);
        mb();
}

static inline unsigned char __snd_gf1_look8(struct snd_gus_card * gus,
                                            unsigned char reg)
{
        outb(reg, gus->gf1.reg_regsel);
        mb();
        return inb(gus->gf1.reg_data8);
}

static inline void __snd_gf1_write16(struct snd_gus_card * gus,
                                     unsigned char reg, unsigned int data)
{
        outb(reg, gus->gf1.reg_regsel);
        mb();
        outw((unsigned short) data, gus->gf1.reg_data16);
        mb();
}

static inline unsigned short __snd_gf1_look16(struct snd_gus_card * gus,
                                              unsigned char reg)
{
        outb(reg, gus->gf1.reg_regsel);
        mb();
        return inw(gus->gf1.reg_data16);
}

static inline void __snd_gf1_adlib_write(struct snd_gus_card * gus,
                                         unsigned char reg, unsigned char data)
{
        outb(reg, gus->gf1.reg_timerctrl);
        inb(gus->gf1.reg_timerctrl);
        inb(gus->gf1.reg_timerctrl);
        outb(data, gus->gf1.reg_timerdata);
        inb(gus->gf1.reg_timerctrl);
        inb(gus->gf1.reg_timerctrl);
}

static inline void __snd_gf1_write_addr(struct snd_gus_card * gus, unsigned char reg,
                                        unsigned int addr, int w_16bit)
{
        if (gus->gf1.enh_mode) {
                if (w_16bit)
                        addr = ((addr >> 1) & ~0x0000000f) | (addr & 0x0000000f);
                __snd_gf1_write8(gus, SNDRV_GF1_VB_UPPER_ADDRESS, (unsigned char) ((addr >> 26) & 0x03));
        } else if (w_16bit)
                addr = (addr & 0x00c0000f) | ((addr & 0x003ffff0) >> 1);
        __snd_gf1_write16(gus, reg, (unsigned short) (addr >> 11));
        __snd_gf1_write16(gus, reg + 1, (unsigned short) (addr << 5));
}

static inline unsigned int __snd_gf1_read_addr(struct snd_gus_card * gus,
                                               unsigned char reg, short w_16bit)
{
        unsigned int res;

        res = ((unsigned int) __snd_gf1_look16(gus, reg | 0x80) << 11) & 0xfff800;
        res |= ((unsigned int) __snd_gf1_look16(gus, (reg + 1) | 0x80) >> 5) & 0x0007ff;
        if (gus->gf1.enh_mode) {
                res |= (unsigned int) __snd_gf1_look8(gus, SNDRV_GF1_VB_UPPER_ADDRESS | 0x80) << 26;
                if (w_16bit)
                        res = ((res << 1) & 0xffffffe0) | (res & 0x0000000f);
        } else if (w_16bit)
                res = ((res & 0x001ffff0) << 1) | (res & 0x00c0000f);
        return res;
}


/*
 *  =======================================================================
 */

void snd_gf1_ctrl_stop(struct snd_gus_card * gus, unsigned char reg)
{
        __snd_gf1_ctrl_stop(gus, reg);
}

void snd_gf1_write8(struct snd_gus_card * gus,
                    unsigned char reg,
                    unsigned char data)
{
        __snd_gf1_write8(gus, reg, data);
}

unsigned char snd_gf1_look8(struct snd_gus_card * gus, unsigned char reg)
{
        return __snd_gf1_look8(gus, reg);
}

void snd_gf1_write16(struct snd_gus_card * gus,
                     unsigned char reg,
                     unsigned int data)
{
        __snd_gf1_write16(gus, reg, data);
}

unsigned short snd_gf1_look16(struct snd_gus_card * gus, unsigned char reg)
{
        return __snd_gf1_look16(gus, reg);
}

void snd_gf1_adlib_write(struct snd_gus_card * gus,
                         unsigned char reg,
                         unsigned char data)
{
        __snd_gf1_adlib_write(gus, reg, data);
}

void snd_gf1_write_addr(struct snd_gus_card * gus, unsigned char reg,
                        unsigned int addr, short w_16bit)
{
        __snd_gf1_write_addr(gus, reg, addr, w_16bit);
}

unsigned int snd_gf1_read_addr(struct snd_gus_card * gus,
                               unsigned char reg,
                               short w_16bit)
{
        return __snd_gf1_read_addr(gus, reg, w_16bit);
}

/*

 */

void snd_gf1_i_ctrl_stop(struct snd_gus_card * gus, unsigned char reg)
{
        guard(spinlock_irqsave)(&gus->reg_lock);
        __snd_gf1_ctrl_stop(gus, reg);
}

void snd_gf1_i_write8(struct snd_gus_card * gus,
                      unsigned char reg,
                      unsigned char data)
{
        guard(spinlock_irqsave)(&gus->reg_lock);
        __snd_gf1_write8(gus, reg, data);
}

unsigned char snd_gf1_i_look8(struct snd_gus_card * gus, unsigned char reg)
{
        guard(spinlock_irqsave)(&gus->reg_lock);
        return __snd_gf1_look8(gus, reg);
}

void snd_gf1_i_write16(struct snd_gus_card * gus,
                       unsigned char reg,
                       unsigned int data)
{
        guard(spinlock_irqsave)(&gus->reg_lock);
        __snd_gf1_write16(gus, reg, data);
}

unsigned short snd_gf1_i_look16(struct snd_gus_card * gus, unsigned char reg)
{
        guard(spinlock_irqsave)(&gus->reg_lock);
        return __snd_gf1_look16(gus, reg);
}

void snd_gf1_dram_addr(struct snd_gus_card * gus, unsigned int addr)
{
        outb(0x43, gus->gf1.reg_regsel);
        mb();
        outw((unsigned short) addr, gus->gf1.reg_data16);
        mb();
        outb(0x44, gus->gf1.reg_regsel);
        mb();
        outb((unsigned char) (addr >> 16), gus->gf1.reg_data8);
        mb();
}

void snd_gf1_poke(struct snd_gus_card * gus, unsigned int addr, unsigned char data)
{
        guard(spinlock_irqsave)(&gus->reg_lock);
        outb(SNDRV_GF1_GW_DRAM_IO_LOW, gus->gf1.reg_regsel);
        mb();
        outw((unsigned short) addr, gus->gf1.reg_data16);
        mb();
        outb(SNDRV_GF1_GB_DRAM_IO_HIGH, gus->gf1.reg_regsel);
        mb();
        outb((unsigned char) (addr >> 16), gus->gf1.reg_data8);
        mb();
        outb(data, gus->gf1.reg_dram);
}

unsigned char snd_gf1_peek(struct snd_gus_card * gus, unsigned int addr)
{
        guard(spinlock_irqsave)(&gus->reg_lock);
        outb(SNDRV_GF1_GW_DRAM_IO_LOW, gus->gf1.reg_regsel);
        mb();
        outw((unsigned short) addr, gus->gf1.reg_data16);
        mb();
        outb(SNDRV_GF1_GB_DRAM_IO_HIGH, gus->gf1.reg_regsel);
        mb();
        outb((unsigned char) (addr >> 16), gus->gf1.reg_data8);
        mb();
        return inb(gus->gf1.reg_dram);
}

#if 0

void snd_gf1_pokew(struct snd_gus_card * gus, unsigned int addr, unsigned short data)
{
        if (!gus->interwave)
                dev_dbg(gus->card->dev, "%s - GF1!!!\n", __func__);
        guard(spinlock_irqsave)(&gus->reg_lock);
        outb(SNDRV_GF1_GW_DRAM_IO_LOW, gus->gf1.reg_regsel);
        mb();
        outw((unsigned short) addr, gus->gf1.reg_data16);
        mb();
        outb(SNDRV_GF1_GB_DRAM_IO_HIGH, gus->gf1.reg_regsel);
        mb();
        outb((unsigned char) (addr >> 16), gus->gf1.reg_data8);
        mb();
        outb(SNDRV_GF1_GW_DRAM_IO16, gus->gf1.reg_regsel);
        mb();
        outw(data, gus->gf1.reg_data16);
}

unsigned short snd_gf1_peekw(struct snd_gus_card * gus, unsigned int addr)
{
        if (!gus->interwave)
                dev_dbg(gus->card->dev, "%s - GF1!!!\n", __func__);
        guard(spinlock_irqsave)(&gus->reg_lock);
        outb(SNDRV_GF1_GW_DRAM_IO_LOW, gus->gf1.reg_regsel);
        mb();
        outw((unsigned short) addr, gus->gf1.reg_data16);
        mb();
        outb(SNDRV_GF1_GB_DRAM_IO_HIGH, gus->gf1.reg_regsel);
        mb();
        outb((unsigned char) (addr >> 16), gus->gf1.reg_data8);
        mb();
        outb(SNDRV_GF1_GW_DRAM_IO16, gus->gf1.reg_regsel);
        mb();
        return inw(gus->gf1.reg_data16);
}

void snd_gf1_dram_setmem(struct snd_gus_card * gus, unsigned int addr,
                         unsigned short value, unsigned int count)
{
        unsigned long port;

        if (!gus->interwave)
                dev_dbg(gus->card->dev, "%s - GF1!!!\n", __func__);
        addr &= ~1;
        count >>= 1;
        port = GUSP(gus, GF1DATALOW);
        guard(spinlock_irqsave)(&gus->reg_lock);
        outb(SNDRV_GF1_GW_DRAM_IO_LOW, gus->gf1.reg_regsel);
        mb();
        outw((unsigned short) addr, gus->gf1.reg_data16);
        mb();
        outb(SNDRV_GF1_GB_DRAM_IO_HIGH, gus->gf1.reg_regsel);
        mb();
        outb((unsigned char) (addr >> 16), gus->gf1.reg_data8);
        mb();
        outb(SNDRV_GF1_GW_DRAM_IO16, gus->gf1.reg_regsel);
        while (count--)
                outw(value, port);
}

#endif  /*  0  */

void snd_gf1_select_active_voices(struct snd_gus_card * gus)
{
        unsigned short voices;

        static const unsigned short voices_tbl[32 - 14 + 1] =
        {
            44100, 41160, 38587, 36317, 34300, 32494, 30870, 29400, 28063, 26843,
            25725, 24696, 23746, 22866, 22050, 21289, 20580, 19916, 19293
        };

        voices = gus->gf1.active_voices;
        if (voices > 32)
                voices = 32;
        if (voices < 14)
                voices = 14;
        if (gus->gf1.enh_mode)
                voices = 32;
        gus->gf1.active_voices = voices;
        gus->gf1.playback_freq =
            gus->gf1.enh_mode ? 44100 : voices_tbl[voices - 14];
        if (!gus->gf1.enh_mode) {
                snd_gf1_i_write8(gus, SNDRV_GF1_GB_ACTIVE_VOICES, 0xc0 | (voices - 1));
                udelay(100);
        }
}