/*
   *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   *                   Creative Labs, Inc.
   *  Routines for control of EMU10K1 chips
   *
   *  BUGS:
   *    --
   *
   *  TODO:
   *    --
   *
   *   This program is free software; you can redistribute it and/or modify
   *   it under the terms of the GNU General Public License as published by
   *   the Free Software Foundation; either version 2 of the License, or
   *   (at your option) any later version.
   *
   *   This program is distributed in the hope that it will be useful,
   *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *   GNU General Public License for more details.
   *
   *   You should have received a copy of the GNU General Public License
   *   along with this program; if not, write to the Free Software
   *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
   *
   */
  
  #include <linux/time.h>
  #include <sound/core.h>
  #include <sound/emu10k1.h>
  #include <linux/delay.h>
  #include <linux/export.h>
  #include "p17v.h"
  
  unsigned int snd_emu10k1_ptr_read(struct snd_emu10k1 * emu, unsigned int reg, unsigned int chn)
  {
  	unsigned long flags;
  	unsigned int regptr, val;
  	unsigned int mask;
  
  	mask = emu->audigy ? A_PTR_ADDRESS_MASK : PTR_ADDRESS_MASK;
  	regptr = ((reg << 16) & mask) | (chn & PTR_CHANNELNUM_MASK);
  
  	if (reg & 0xff000000) {
  		unsigned char size, offset;
  		
  		size = (reg >> 24) & 0x3f;
  		offset = (reg >> 16) & 0x1f;
  		mask = ((1 << size) - 1) << offset;
  		
  		spin_lock_irqsave(&emu->emu_lock, flags);
  		outl(regptr, emu->port + PTR);
  		val = inl(emu->port + DATA);
  		spin_unlock_irqrestore(&emu->emu_lock, flags);
  		
  		return (val & mask) >> offset;
  	} else {
  		spin_lock_irqsave(&emu->emu_lock, flags);
  		outl(regptr, emu->port + PTR);
  		val = inl(emu->port + DATA);
  		spin_unlock_irqrestore(&emu->emu_lock, flags);
  		return val;
  	}
  }
  
  EXPORT_SYMBOL(snd_emu10k1_ptr_read);
  
  void snd_emu10k1_ptr_write(struct snd_emu10k1 *emu, unsigned int reg, unsigned int chn, unsigned int data)
  {
  	unsigned int regptr;
  	unsigned long flags;
  	unsigned int mask;
  
  	if (!emu) {
  		snd_printk(KERN_ERR "ptr_write: emu is null!
  ");
  		dump_stack();
  		return;
  	}
  	mask = emu->audigy ? A_PTR_ADDRESS_MASK : PTR_ADDRESS_MASK;
  	regptr = ((reg << 16) & mask) | (chn & PTR_CHANNELNUM_MASK);
  
  	if (reg & 0xff000000) {
  		unsigned char size, offset;
  
  		size = (reg >> 24) & 0x3f;
  		offset = (reg >> 16) & 0x1f;
  		mask = ((1 << size) - 1) << offset;
  		data = (data << offset) & mask;
  
  		spin_lock_irqsave(&emu->emu_lock, flags);
  		outl(regptr, emu->port + PTR);
  		data |= inl(emu->port + DATA) & ~mask;
  		outl(data, emu->port + DATA);
  		spin_unlock_irqrestore(&emu->emu_lock, flags);		
  	} else {
  		spin_lock_irqsave(&emu->emu_lock, flags);
  		outl(regptr, emu->port + PTR);
  		outl(data, emu->port + DATA);
  		spin_unlock_irqrestore(&emu->emu_lock, flags);
  	}
  }
  
  EXPORT_SYMBOL(snd_emu10k1_ptr_write);
  
  unsigned int snd_emu10k1_ptr20_read(struct snd_emu10k1 * emu, 
  					  unsigned int reg, 
  					  unsigned int chn)
  {
  	unsigned long flags;
  	unsigned int regptr, val;
    
  	regptr = (reg << 16) | chn;
  
  	spin_lock_irqsave(&emu->emu_lock, flags);
  	outl(regptr, emu->port + 0x20 + PTR);
  	val = inl(emu->port + 0x20 + DATA);
  	spin_unlock_irqrestore(&emu->emu_lock, flags);
  	return val;
  }
  
  void snd_emu10k1_ptr20_write(struct snd_emu10k1 *emu, 
  				   unsigned int reg, 
  				   unsigned int chn, 
  				   unsigned int data)
  {
  	unsigned int regptr;
  	unsigned long flags;
  
  	regptr = (reg << 16) | chn;
  
  	spin_lock_irqsave(&emu->emu_lock, flags);
  	outl(regptr, emu->port + 0x20 + PTR);
  	outl(data, emu->port + 0x20 + DATA);
  	spin_unlock_irqrestore(&emu->emu_lock, flags);
  }
  
  int snd_emu10k1_spi_write(struct snd_emu10k1 * emu,
  				   unsigned int data)
  {
  	unsigned int reset, set;
  	unsigned int reg, tmp;
  	int n, result;
  	int err = 0;
  
  	/* This function is not re-entrant, so protect against it. */
  	spin_lock(&emu->spi_lock);
  	if (emu->card_capabilities->ca0108_chip)
  		reg = 0x3c; /* PTR20, reg 0x3c */
  	else {
  		/* For other chip types the SPI register
  		 * is currently unknown. */
  		err = 1;
  		goto spi_write_exit;
  	}
  	if (data > 0xffff) {
  		/* Only 16bit values allowed */
  		err = 1;
  		goto spi_write_exit;
  	}
  
  	tmp = snd_emu10k1_ptr20_read(emu, reg, 0);
  	reset = (tmp & ~0x3ffff) | 0x20000; /* Set xxx20000 */
  	set = reset | 0x10000; /* Set xxx1xxxx */
  	snd_emu10k1_ptr20_write(emu, reg, 0, reset | data);
  	tmp = snd_emu10k1_ptr20_read(emu, reg, 0); /* write post */
  	snd_emu10k1_ptr20_write(emu, reg, 0, set | data);
  	result = 1;
  	/* Wait for status bit to return to 0 */
  	for (n = 0; n < 100; n++) {
  		udelay(10);
  		tmp = snd_emu10k1_ptr20_read(emu, reg, 0);
  		if (!(tmp & 0x10000)) {
  			result = 0;
  			break;
  		}
  	}
  	if (result) {
  		/* Timed out */
  		err = 1;
  		goto spi_write_exit;
  	}
  	snd_emu10k1_ptr20_write(emu, reg, 0, reset | data);
  	tmp = snd_emu10k1_ptr20_read(emu, reg, 0); /* Write post */
  	err = 0;
  spi_write_exit:
  	spin_unlock(&emu->spi_lock);
  	return err;
  }
  
  /* The ADC does not support i2c read, so only write is implemented */
  int snd_emu10k1_i2c_write(struct snd_emu10k1 *emu,
  				u32 reg,
  				u32 value)
  {
  	u32 tmp;
  	int timeout = 0;
  	int status;
  	int retry;
  	int err = 0;
  
  	if ((reg > 0x7f) || (value > 0x1ff)) {
  		snd_printk(KERN_ERR "i2c_write: invalid values.
  ");
  		return -EINVAL;
  	}
  
  	/* This function is not re-entrant, so protect against it. */
  	spin_lock(&emu->i2c_lock);
  
  	tmp = reg << 25 | value << 16;
  
  	/* This controls the I2C connected to the WM8775 ADC Codec */
  	snd_emu10k1_ptr20_write(emu, P17V_I2C_1, 0, tmp);
  	tmp = snd_emu10k1_ptr20_read(emu, P17V_I2C_1, 0); /* write post */
  
  	for (retry = 0; retry < 10; retry++) {
  		/* Send the data to i2c */
  		tmp = 0;
  		tmp = tmp | (I2C_A_ADC_LAST|I2C_A_ADC_START|I2C_A_ADC_ADD);
  		snd_emu10k1_ptr20_write(emu, P17V_I2C_ADDR, 0, tmp);
  
  		/* Wait till the transaction ends */
  		while (1) {
  			mdelay(1);
  			status = snd_emu10k1_ptr20_read(emu, P17V_I2C_ADDR, 0);
  			timeout++;
  			if ((status & I2C_A_ADC_START) == 0)
  				break;
  
  			if (timeout > 1000) {
                  		snd_printk(KERN_WARNING
  					   "emu10k1:I2C:timeout status=0x%x
  ",
  					   status);
  				break;
  			}
  		}
  		//Read back and see if the transaction is successful
  		if ((status & I2C_A_ADC_ABORT) == 0)
  			break;
  	}
  
  	if (retry == 10) {
  		snd_printk(KERN_ERR "Writing to ADC failed!
  ");
  		snd_printk(KERN_ERR "status=0x%x, reg=%d, value=%d
  ",
  			status, reg, value);
  		/* dump_stack(); */
  		err = -EINVAL;
  	}
      
  	spin_unlock(&emu->i2c_lock);
  	return err;
  }
  
  int snd_emu1010_fpga_write(struct snd_emu10k1 * emu, u32 reg, u32 value)
  {
  	unsigned long flags;
  
  	if (reg > 0x3f)
  		return 1;
  	reg += 0x40; /* 0x40 upwards are registers. */
  	if (value > 0x3f) /* 0 to 0x3f are values */
  		return 1;
  	spin_lock_irqsave(&emu->emu_lock, flags);
  	outl(reg, emu->port + A_IOCFG);
  	udelay(10);
  	outl(reg | 0x80, emu->port + A_IOCFG);  /* High bit clocks the value into the fpga. */
  	udelay(10);
  	outl(value, emu->port + A_IOCFG);
  	udelay(10);
  	outl(value | 0x80 , emu->port + A_IOCFG);  /* High bit clocks the value into the fpga. */
  	spin_unlock_irqrestore(&emu->emu_lock, flags);
  
  	return 0;
  }
  
  int snd_emu1010_fpga_read(struct snd_emu10k1 * emu, u32 reg, u32 *value)
  {
  	unsigned long flags;
  	if (reg > 0x3f)
  		return 1;
  	reg += 0x40; /* 0x40 upwards are registers. */
  	spin_lock_irqsave(&emu->emu_lock, flags);
  	outl(reg, emu->port + A_IOCFG);
  	udelay(10);
  	outl(reg | 0x80, emu->port + A_IOCFG);  /* High bit clocks the value into the fpga. */
  	udelay(10);
  	*value = ((inl(emu->port + A_IOCFG) >> 8) & 0x7f);
  	spin_unlock_irqrestore(&emu->emu_lock, flags);
  
  	return 0;
  }
  
  /* Each Destination has one and only one Source,
   * but one Source can feed any number of Destinations simultaneously.
   */
  int snd_emu1010_fpga_link_dst_src_write(struct snd_emu10k1 * emu, u32 dst, u32 src)
  {
  	snd_emu1010_fpga_write(emu, 0x00, ((dst >> 8) & 0x3f) );
  	snd_emu1010_fpga_write(emu, 0x01, (dst & 0x3f) );
  	snd_emu1010_fpga_write(emu, 0x02, ((src >> 8) & 0x3f) );
  	snd_emu1010_fpga_write(emu, 0x03, (src & 0x3f) );
  
  	return 0;
  }
  
  void snd_emu10k1_intr_enable(struct snd_emu10k1 *emu, unsigned int intrenb)
  {
  	unsigned long flags;
  	unsigned int enable;
  
  	spin_lock_irqsave(&emu->emu_lock, flags);
  	enable = inl(emu->port + INTE) | intrenb;
  	outl(enable, emu->port + INTE);
  	spin_unlock_irqrestore(&emu->emu_lock, flags);
  }
  
  void snd_emu10k1_intr_disable(struct snd_emu10k1 *emu, unsigned int intrenb)
  {
  	unsigned long flags;
  	unsigned int enable;
  
  	spin_lock_irqsave(&emu->emu_lock, flags);
  	enable = inl(emu->port + INTE) & ~intrenb;
  	outl(enable, emu->port + INTE);
  	spin_unlock_irqrestore(&emu->emu_lock, flags);
  }
  
  void snd_emu10k1_voice_intr_enable(struct snd_emu10k1 *emu, unsigned int voicenum)
  {
  	unsigned long flags;
  	unsigned int val;
  
  	spin_lock_irqsave(&emu->emu_lock, flags);
  	/* voice interrupt */
  	if (voicenum >= 32) {
  		outl(CLIEH << 16, emu->port + PTR);
  		val = inl(emu->port + DATA);
  		val |= 1 << (voicenum - 32);
  	} else {
  		outl(CLIEL << 16, emu->port + PTR);
  		val = inl(emu->port + DATA);
  		val |= 1 << voicenum;
  	}
  	outl(val, emu->port + DATA);
  	spin_unlock_irqrestore(&emu->emu_lock, flags);
  }
  
  void snd_emu10k1_voice_intr_disable(struct snd_emu10k1 *emu, unsigned int voicenum)
  {
  	unsigned long flags;
  	unsigned int val;
  
  	spin_lock_irqsave(&emu->emu_lock, flags);
  	/* voice interrupt */
  	if (voicenum >= 32) {
  		outl(CLIEH << 16, emu->port + PTR);
  		val = inl(emu->port + DATA);
  		val &= ~(1 << (voicenum - 32));
  	} else {
  		outl(CLIEL << 16, emu->port + PTR);
  		val = inl(emu->port + DATA);
  		val &= ~(1 << voicenum);
  	}
  	outl(val, emu->port + DATA);
  	spin_unlock_irqrestore(&emu->emu_lock, flags);
  }
  
  void snd_emu10k1_voice_intr_ack(struct snd_emu10k1 *emu, unsigned int voicenum)
  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&emu->emu_lock, flags);
  	/* voice interrupt */
  	if (voicenum >= 32) {
  		outl(CLIPH << 16, emu->port + PTR);
  		voicenum = 1 << (voicenum - 32);
  	} else {
  		outl(CLIPL << 16, emu->port + PTR);
  		voicenum = 1 << voicenum;
  	}
  	outl(voicenum, emu->port + DATA);
  	spin_unlock_irqrestore(&emu->emu_lock, flags);
  }
  
  void snd_emu10k1_voice_half_loop_intr_enable(struct snd_emu10k1 *emu, unsigned int voicenum)
  {
  	unsigned long flags;
  	unsigned int val;
  
  	spin_lock_irqsave(&emu->emu_lock, flags);
  	/* voice interrupt */
  	if (voicenum >= 32) {
  		outl(HLIEH << 16, emu->port + PTR);
  		val = inl(emu->port + DATA);
  		val |= 1 << (voicenum - 32);
  	} else {
  		outl(HLIEL << 16, emu->port + PTR);
  		val = inl(emu->port + DATA);
  		val |= 1 << voicenum;
  	}
  	outl(val, emu->port + DATA);
  	spin_unlock_irqrestore(&emu->emu_lock, flags);
  }
  
  void snd_emu10k1_voice_half_loop_intr_disable(struct snd_emu10k1 *emu, unsigned int voicenum)
  {
  	unsigned long flags;
  	unsigned int val;
  
  	spin_lock_irqsave(&emu->emu_lock, flags);
  	/* voice interrupt */
  	if (voicenum >= 32) {
  		outl(HLIEH << 16, emu->port + PTR);
  		val = inl(emu->port + DATA);
  		val &= ~(1 << (voicenum - 32));
  	} else {
  		outl(HLIEL << 16, emu->port + PTR);
  		val = inl(emu->port + DATA);
  		val &= ~(1 << voicenum);
  	}
  	outl(val, emu->port + DATA);
  	spin_unlock_irqrestore(&emu->emu_lock, flags);
  }
  
  void snd_emu10k1_voice_half_loop_intr_ack(struct snd_emu10k1 *emu, unsigned int voicenum)
  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&emu->emu_lock, flags);
  	/* voice interrupt */
  	if (voicenum >= 32) {
  		outl(HLIPH << 16, emu->port + PTR);
  		voicenum = 1 << (voicenum - 32);
  	} else {
  		outl(HLIPL << 16, emu->port + PTR);
  		voicenum = 1 << voicenum;
  	}
  	outl(voicenum, emu->port + DATA);
  	spin_unlock_irqrestore(&emu->emu_lock, flags);
  }
  
  void snd_emu10k1_voice_set_loop_stop(struct snd_emu10k1 *emu, unsigned int voicenum)
  {
  	unsigned long flags;
  	unsigned int sol;
  
  	spin_lock_irqsave(&emu->emu_lock, flags);
  	/* voice interrupt */
  	if (voicenum >= 32) {
  		outl(SOLEH << 16, emu->port + PTR);
  		sol = inl(emu->port + DATA);
  		sol |= 1 << (voicenum - 32);
  	} else {
  		outl(SOLEL << 16, emu->port + PTR);
  		sol = inl(emu->port + DATA);
  		sol |= 1 << voicenum;
  	}
  	outl(sol, emu->port + DATA);
  	spin_unlock_irqrestore(&emu->emu_lock, flags);
  }
  
  void snd_emu10k1_voice_clear_loop_stop(struct snd_emu10k1 *emu, unsigned int voicenum)
  {
  	unsigned long flags;
  	unsigned int sol;
  
  	spin_lock_irqsave(&emu->emu_lock, flags);
  	/* voice interrupt */
  	if (voicenum >= 32) {
  		outl(SOLEH << 16, emu->port + PTR);
  		sol = inl(emu->port + DATA);
  		sol &= ~(1 << (voicenum - 32));
  	} else {
  		outl(SOLEL << 16, emu->port + PTR);
  		sol = inl(emu->port + DATA);
  		sol &= ~(1 << voicenum);
  	}
  	outl(sol, emu->port + DATA);
  	spin_unlock_irqrestore(&emu->emu_lock, flags);
  }
  
  void snd_emu10k1_wait(struct snd_emu10k1 *emu, unsigned int wait)
  {
  	volatile unsigned count;
  	unsigned int newtime = 0, curtime;
  
  	curtime = inl(emu->port + WC) >> 6;
  	while (wait-- > 0) {
  		count = 0;
  		while (count++ < 16384) {
  			newtime = inl(emu->port + WC) >> 6;
  			if (newtime != curtime)
  				break;
  		}
  		if (count > 16384)
  			break;
  		curtime = newtime;
  	}
  }
  
  unsigned short snd_emu10k1_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
  {
  	struct snd_emu10k1 *emu = ac97->private_data;
  	unsigned long flags;
  	unsigned short val;
  
  	spin_lock_irqsave(&emu->emu_lock, flags);
  	outb(reg, emu->port + AC97ADDRESS);
  	val = inw(emu->port + AC97DATA);
  	spin_unlock_irqrestore(&emu->emu_lock, flags);
  	return val;
  }
  
  void snd_emu10k1_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short data)
  {
  	struct snd_emu10k1 *emu = ac97->private_data;
  	unsigned long flags;
  
  	spin_lock_irqsave(&emu->emu_lock, flags);
  	outb(reg, emu->port + AC97ADDRESS);
  	outw(data, emu->port + AC97DATA);
  	spin_unlock_irqrestore(&emu->emu_lock, flags);
  }
  
  /*
   *  convert rate to pitch
   */
  
  unsigned int snd_emu10k1_rate_to_pitch(unsigned int rate)
  {
  	static u32 logMagTable[128] = {
  		0x00000, 0x02dfc, 0x05b9e, 0x088e6, 0x0b5d6, 0x0e26f, 0x10eb3, 0x13aa2,
  		0x1663f, 0x1918a, 0x1bc84, 0x1e72e, 0x2118b, 0x23b9a, 0x2655d, 0x28ed5,
  		0x2b803, 0x2e0e8, 0x30985, 0x331db, 0x359eb, 0x381b6, 0x3a93d, 0x3d081,
  		0x3f782, 0x41e42, 0x444c1, 0x46b01, 0x49101, 0x4b6c4, 0x4dc49, 0x50191,
  		0x5269e, 0x54b6f, 0x57006, 0x59463, 0x5b888, 0x5dc74, 0x60029, 0x623a7,
  		0x646ee, 0x66a00, 0x68cdd, 0x6af86, 0x6d1fa, 0x6f43c, 0x7164b, 0x73829,
  		0x759d4, 0x77b4f, 0x79c9a, 0x7bdb5, 0x7dea1, 0x7ff5e, 0x81fed, 0x8404e,
  		0x86082, 0x88089, 0x8a064, 0x8c014, 0x8df98, 0x8fef1, 0x91e20, 0x93d26,
  		0x95c01, 0x97ab4, 0x9993e, 0x9b79f, 0x9d5d9, 0x9f3ec, 0xa11d8, 0xa2f9d,
  		0xa4d3c, 0xa6ab5, 0xa8808, 0xaa537, 0xac241, 0xadf26, 0xafbe7, 0xb1885,
  		0xb3500, 0xb5157, 0xb6d8c, 0xb899f, 0xba58f, 0xbc15e, 0xbdd0c, 0xbf899,
  		0xc1404, 0xc2f50, 0xc4a7b, 0xc6587, 0xc8073, 0xc9b3f, 0xcb5ed, 0xcd07c,
  		0xceaec, 0xd053f, 0xd1f73, 0xd398a, 0xd5384, 0xd6d60, 0xd8720, 0xda0c3,
  		0xdba4a, 0xdd3b4, 0xded03, 0xe0636, 0xe1f4e, 0xe384a, 0xe512c, 0xe69f3,
  		0xe829f, 0xe9b31, 0xeb3a9, 0xecc08, 0xee44c, 0xefc78, 0xf148a, 0xf2c83,
  		0xf4463, 0xf5c2a, 0xf73da, 0xf8b71, 0xfa2f0, 0xfba57, 0xfd1a7, 0xfe8df
  	};
  	static char logSlopeTable[128] = {
  		0x5c, 0x5c, 0x5b, 0x5a, 0x5a, 0x59, 0x58, 0x58,
  		0x57, 0x56, 0x56, 0x55, 0x55, 0x54, 0x53, 0x53,
  		0x52, 0x52, 0x51, 0x51, 0x50, 0x50, 0x4f, 0x4f,
  		0x4e, 0x4d, 0x4d, 0x4d, 0x4c, 0x4c, 0x4b, 0x4b,
  		0x4a, 0x4a, 0x49, 0x49, 0x48, 0x48, 0x47, 0x47,
  		0x47, 0x46, 0x46, 0x45, 0x45, 0x45, 0x44, 0x44,
  		0x43, 0x43, 0x43, 0x42, 0x42, 0x42, 0x41, 0x41,
  		0x41, 0x40, 0x40, 0x40, 0x3f, 0x3f, 0x3f, 0x3e,
  		0x3e, 0x3e, 0x3d, 0x3d, 0x3d, 0x3c, 0x3c, 0x3c,
  		0x3b, 0x3b, 0x3b, 0x3b, 0x3a, 0x3a, 0x3a, 0x39,
  		0x39, 0x39, 0x39, 0x38, 0x38, 0x38, 0x38, 0x37,
  		0x37, 0x37, 0x37, 0x36, 0x36, 0x36, 0x36, 0x35,
  		0x35, 0x35, 0x35, 0x34, 0x34, 0x34, 0x34, 0x34,
  		0x33, 0x33, 0x33, 0x33, 0x32, 0x32, 0x32, 0x32,
  		0x32, 0x31, 0x31, 0x31, 0x31, 0x31, 0x30, 0x30,
  		0x30, 0x30, 0x30, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f
  	};
  	int i;
  
  	if (rate == 0)
  		return 0;	/* Bail out if no leading "1" */
  	rate *= 11185;		/* Scale 48000 to 0x20002380 */
  	for (i = 31; i > 0; i--) {
  		if (rate & 0x80000000) {	/* Detect leading "1" */
  			return (((unsigned int) (i - 15) << 20) +
  			       logMagTable[0x7f & (rate >> 24)] +
  					(0x7f & (rate >> 17)) *
  					logSlopeTable[0x7f & (rate >> 24)]);
  		}
  		rate <<= 1;
  	}
  
  	return 0;		/* Should never reach this point */
  }