// 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)
{
	unsigned long flags;

	spin_lock_irqsave(&gus->reg_lock, flags);
	__snd_gf1_ctrl_stop(gus, reg);
	spin_unlock_irqrestore(&gus->reg_lock, flags);
}

void snd_gf1_i_write8(struct snd_gus_card * gus,
		      unsigned char reg,
                      unsigned char data)
{
	unsigned long flags;

	spin_lock_irqsave(&gus->reg_lock, flags);
	__snd_gf1_write8(gus, reg, data);
	spin_unlock_irqrestore(&gus->reg_lock, flags);
}

unsigned char snd_gf1_i_look8(struct snd_gus_card * gus, unsigned char reg)
{
	unsigned long flags;
	unsigned char res;

	spin_lock_irqsave(&gus->reg_lock, flags);
	res = __snd_gf1_look8(gus, reg);
	spin_unlock_irqrestore(&gus->reg_lock, flags);
	return res;
}

void snd_gf1_i_write16(struct snd_gus_card * gus,
		       unsigned char reg,
		       unsigned int data)
{
	unsigned long flags;

	spin_lock_irqsave(&gus->reg_lock, flags);
	__snd_gf1_write16(gus, reg, data);
	spin_unlock_irqrestore(&gus->reg_lock, flags);
}

unsigned short snd_gf1_i_look16(struct snd_gus_card * gus, unsigned char reg)
{
	unsigned long flags;
	unsigned short res;

	spin_lock_irqsave(&gus->reg_lock, flags);
	res = __snd_gf1_look16(gus, reg);
	spin_unlock_irqrestore(&gus->reg_lock, flags);
	return res;
}

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)
{
	unsigned long flags;

	spin_lock_irqsave(&gus->reg_lock, flags);
	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);
	spin_unlock_irqrestore(&gus->reg_lock, flags);
}

unsigned char snd_gf1_peek(struct snd_gus_card * gus, unsigned int addr)
{
	unsigned long flags;
	unsigned char res;

	spin_lock_irqsave(&gus->reg_lock, flags);
	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();
	res = inb(gus->gf1.reg_dram);
	spin_unlock_irqrestore(&gus->reg_lock, flags);
	return res;
}

#if 0

void snd_gf1_pokew(struct snd_gus_card * gus, unsigned int addr, unsigned short data)
{
	unsigned long flags;

	if (!gus->interwave)
		dev_dbg(gus->card->dev, "%s - GF1!!!\n", __func__);
	spin_lock_irqsave(&gus->reg_lock, flags);
	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);
	spin_unlock_irqrestore(&gus->reg_lock, flags);
}

unsigned short snd_gf1_peekw(struct snd_gus_card * gus, unsigned int addr)
{
	unsigned long flags;
	unsigned short res;

	if (!gus->interwave)
		dev_dbg(gus->card->dev, "%s - GF1!!!\n", __func__);
	spin_lock_irqsave(&gus->reg_lock, flags);
	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();
	res = inw(gus->gf1.reg_data16);
	spin_unlock_irqrestore(&gus->reg_lock, flags);
	return res;
}

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

	if (!gus->interwave)
		dev_dbg(gus->card->dev, "%s - GF1!!!\n", __func__);
	addr &= ~1;
	count >>= 1;
	port = GUSP(gus, GF1DATALOW);
	spin_lock_irqsave(&gus->reg_lock, flags);
	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);
	spin_unlock_irqrestore(&gus->reg_lock, flags);
}

#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);
	}
}