path: root/sound/isa/sb/emu8000.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *     and (c) 1999 Steve Ratcliffe <steve@parabola.demon.co.uk>
 *  Copyright (C) 1999-2000 Takashi Iwai <tiwai@suse.de>
 *
 *  Routines for control of EMU8000 chip
 */

#include <linux/wait.h>
#include <linux/sched/signal.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/export.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <sound/core.h>
#include <sound/emu8000.h>
#include <sound/emu8000_reg.h>
#include <linux/uaccess.h>
#include <linux/init.h>
#include <sound/control.h>
#include <sound/initval.h>

/*
 * emu8000 register controls
 */

/*
 * The following routines read and write registers on the emu8000.  They
 * should always be called via the EMU8000*READ/WRITE macros and never
 * directly.  The macros handle the port number and command word.
 */
/* Write a word */
void snd_emu8000_poke(struct snd_emu8000 *emu, unsigned int port, unsigned int reg, unsigned int val)
{
	unsigned long flags;
	spin_lock_irqsave(&emu->reg_lock, flags);
	if (reg != emu->last_reg) {
		outw((unsigned short)reg, EMU8000_PTR(emu)); /* Set register */
		emu->last_reg = reg;
	}
	outw((unsigned short)val, port); /* Send data */
	spin_unlock_irqrestore(&emu->reg_lock, flags);
}

/* Read a word */
unsigned short snd_emu8000_peek(struct snd_emu8000 *emu, unsigned int port, unsigned int reg)
{
	unsigned short res;
	unsigned long flags;
	spin_lock_irqsave(&emu->reg_lock, flags);
	if (reg != emu->last_reg) {
		outw((unsigned short)reg, EMU8000_PTR(emu)); /* Set register */
		emu->last_reg = reg;
	}
	res = inw(port);	/* Read data */
	spin_unlock_irqrestore(&emu->reg_lock, flags);
	return res;
}

/* Write a double word */
void snd_emu8000_poke_dw(struct snd_emu8000 *emu, unsigned int port, unsigned int reg, unsigned int val)
{
	unsigned long flags;
	spin_lock_irqsave(&emu->reg_lock, flags);
	if (reg != emu->last_reg) {
		outw((unsigned short)reg, EMU8000_PTR(emu)); /* Set register */
		emu->last_reg = reg;
	}
	outw((unsigned short)val, port); /* Send low word of data */
	outw((unsigned short)(val>>16), port+2); /* Send high word of data */
	spin_unlock_irqrestore(&emu->reg_lock, flags);
}

/* Read a double word */
unsigned int snd_emu8000_peek_dw(struct snd_emu8000 *emu, unsigned int port, unsigned int reg)
{
	unsigned short low;
	unsigned int res;
	unsigned long flags;
	spin_lock_irqsave(&emu->reg_lock, flags);
	if (reg != emu->last_reg) {
		outw((unsigned short)reg, EMU8000_PTR(emu)); /* Set register */
		emu->last_reg = reg;
	}
	low = inw(port);	/* Read low word of data */
	res = low + (inw(port+2) << 16);
	spin_unlock_irqrestore(&emu->reg_lock, flags);
	return res;
}

/*
 * Set up / close a channel to be used for DMA.
 */
/*exported*/ void
snd_emu8000_dma_chan(struct snd_emu8000 *emu, int ch, int mode)
{
	unsigned right_bit = (mode & EMU8000_RAM_RIGHT) ? 0x01000000 : 0;
	mode &= EMU8000_RAM_MODE_MASK;
	if (mode == EMU8000_RAM_CLOSE) {
		EMU8000_CCCA_WRITE(emu, ch, 0);
		EMU8000_DCYSUSV_WRITE(emu, ch, 0x807F);
		return;
	}
	EMU8000_DCYSUSV_WRITE(emu, ch, 0x80);
	EMU8000_VTFT_WRITE(emu, ch, 0);
	EMU8000_CVCF_WRITE(emu, ch, 0);
	EMU8000_PTRX_WRITE(emu, ch, 0x40000000);
	EMU8000_CPF_WRITE(emu, ch, 0x40000000);
	EMU8000_PSST_WRITE(emu, ch, 0);
	EMU8000_CSL_WRITE(emu, ch, 0);
	if (mode == EMU8000_RAM_WRITE) /* DMA write */
		EMU8000_CCCA_WRITE(emu, ch, 0x06000000 | right_bit);
	else	   /* DMA read */
		EMU8000_CCCA_WRITE(emu, ch, 0x04000000 | right_bit);
}

/*
 */
static void
snd_emu8000_read_wait(struct snd_emu8000 *emu)
{
	while ((EMU8000_SMALR_READ(emu) & 0x80000000) != 0) {
		schedule_timeout_interruptible(1);
		if (signal_pending(current))
			break;
	}
}

/*
 */
static void
snd_emu8000_write_wait(struct snd_emu8000 *emu)
{