/****************************************************************************

   Copyright Echo Digital Audio Corporation (c) 1998 - 2004
   All rights reserved
   www.echoaudio.com

   This file is part of Echo Digital Audio's generic driver library.

   Echo Digital Audio's generic driver library 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.

   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.

   *************************************************************************

 Translation from C++ and adaptation for use in ALSA-Driver
 were made by Giuliano Pochini <pochini@shiny.it>

****************************************************************************/


static int write_control_reg(struct echoaudio *chip, u32 value, char force);
static int set_input_clock(struct echoaudio *chip, u16 clock);
static int set_professional_spdif(struct echoaudio *chip, char prof);
static int set_digital_mode(struct echoaudio *chip, u8 mode);
static int load_asic_generic(struct echoaudio *chip, u32 cmd,
			     const struct firmware *asic);
static int check_asic_status(struct echoaudio *chip);


static int init_hw(struct echoaudio *chip, u16 device_id, u16 subdevice_id)
{
	int err;

	DE_INIT(("init_hw() - Mona\n"));
	snd_assert((subdevice_id & 0xfff0) == MONA, return -ENODEV);

	if ((err = init_dsp_comm_page(chip))) {
		DE_INIT(("init_hw - could not initialize DSP comm page\n"));
		return err;
	}

	chip->device_id = device_id;
	chip->subdevice_id = subdevice_id;
	chip->bad_board = TRUE;
	chip->input_clock_types =
		ECHO_CLOCK_BIT_INTERNAL | ECHO_CLOCK_BIT_SPDIF |
		ECHO_CLOCK_BIT_WORD | ECHO_CLOCK_BIT_ADAT;
	chip->digital_modes =
		ECHOCAPS_HAS_DIGITAL_MODE_SPDIF_RCA |
		ECHOCAPS_HAS_DIGITAL_MODE_SPDIF_OPTICAL |
		ECHOCAPS_HAS_DIGITAL_MODE_ADAT;

	/* Mona comes in both '301 and '361 flavors */
	if (chip->device_id == DEVICE_ID_56361)
		chip->dsp_code_to_load = &card_fw[FW_MONA_361_DSP];
	else
		chip->dsp_code_to_load = &card_fw[FW_MONA_301_DSP];

	chip->digital_mode = DIGITAL_MODE_SPDIF_RCA;
	chip->professional_spdif = FALSE;
	chip->digital_in_automute = TRUE;

	if ((err = load_firmware(chip)) < 0)
		return err;
	chip->bad_board = FALSE;

	if ((err = init_line_levels(chip)) < 0)
		return err;

	err = set_digital_mode(chip, DIGITAL_MODE_SPDIF_RCA);
	snd_assert(err >= 0, return err);
	err = set_professional_spdif(chip, TRUE);

	DE_INIT(("init_hw done\n"));
	return err;
}


static u32 detect_input_clocks(const struct echoaudio *chip)
{
	u32 clocks_from_dsp, clock_bits;

	/* Map the DSP clock detect bits to the generic driver clock
	   detect bits */
	clocks_from_dsp = le32_to_cpu(chip->comm_page->status_clocks);

	clock_bits = ECHO_CLOCK_BIT_INTERNAL;

	if (clocks_from_dsp & GML_CLOCK_DETECT_BIT_SPDIF)
		clock_bits |= ECHO_CLOCK_BIT_SPDIF;

	if (clocks_from_dsp & GML_CLOCK_DETECT_BIT_ADAT)
		clock_bits |= ECHO_CLOCK_BIT_ADAT;

	if (clocks_from_dsp & GML_CLOCK_DETECT_BIT_WORD)
		clock_bits |= ECHO_CLOCK_BIT_WORD;

	return clock_bits;
}


/* Mona has an ASIC on the PCI card and another ASIC in the external box; 
both need to be loaded. */
static int load_asic(struct echoaudio *chip)
{
	u32 control_reg;
	int err;
	const struct firmware *asic;

	if (chip->asic_loaded)
		return 0;

	mdelay(10);

	if (chip->device_id == DEVICE_ID_56361)
		asic = &card_fw[FW_MONA_361_1_ASIC48];
	else
		asic = &card_fw[FW_MONA_301_1_ASIC48];

	err = load_asic_generic(chip, DSP_FNC_LOAD_MONA_PCI_CARD_ASIC, asic);
	if (err < 0)
		return err;

	chip->asic_code = asic;
	mdelay(10);

	/* Do the external one */
	err = load_asic_generic(chip, DSP_FNC_LOAD_MONA_EXTERNAL_ASIC,
				&card_fw[FW_MONA_2_ASIC]);
	if (err < 0)
		return err;

	mdelay(10);
	err = check_asic_status(chip);

	/* Set up the control register if the load succeeded -
	   48 kHz, internal clock, S/PDIF RCA mode */
	if (!err) {
		control_reg = GML_CONVERTER_ENABLE | GML_48KHZ;
		err = write_control_reg(chip, control_reg, TRUE);
	}

	return err;
}


/* Depending on what digital mode you want, Mona needs different ASICs
loaded.  This function checks the ASIC needed for the new mode and sees
if it matches the one already loaded. */
static int switch_asic(struct echoaudio *chip, char double_speed)
{
	const struct firmware *asic;
	int err;

	/* Check the clock detect bits to see if this is
	a single-speed clock or a double-speed clock; load
	a new ASIC if necessary. */
	if (chip->device_id == DEVICE_ID_56361) {
		if (double_speed)
			asic = &card_fw[FW_MONA_361_1_ASIC96];
		else
			asic = &card_fw[FW_MONA_361_1_ASIC48];
	} else {
		if (double_speed)
			asic = &card_fw[FW_MONA_301_1_ASIC96];
		else
			asic = &card_fw[FW_MONA_301_1_ASIC48];
	}

	if (asic != chip->asic_code) {
		/* Load the desired ASIC */
		err = load_asic_generic(chip, DSP_FNC_LOAD_MONA_PCI_CARD_ASIC,
					asic);
		if (err < 0)
			return err;
		chip->asic_code = asic;
	}

	return 0;
}


static int set_sample_rate(struct echoaudio *chip, u32 rate)
{
	u32 control_reg, clock;
	const struct firmware *asic;
	char force_write;

	/* Only set the clock for internal mode. */
	if (chip->input_clock != ECHO_CLOCK_INTERNAL) {
		DE_ACT(("set_sample_rate: Cannot set sample rate - "
			"clock not set to CLK_CLOCKININTERNAL\n"));
		/* Save the rate anyhow */
		chip->comm_page->sample_rate = cpu_to_le32(rate);
		chip->sample_rate = rate;
		return 0;
	}

	/* Now, check to see if the required ASIC is loaded */
	if (rate >= 88200) {
		if (chip->digital_mode == DIGITAL_MODE_ADAT)
			return -EINVAL;
		if (chip->device_id == DEVICE_ID_56361)
			asic = &card_fw[FW_MONA_361_1_ASIC96];
		else
			asic = &card_fw[FW_MONA_301_1_ASIC96];
	} else {
		if (chip->device_id == DEVICE_ID_56361)
			asic = &card_fw[FW_MONA_361_1_ASIC48];
		else
			asic = &card_fw[FW_MONA_301_1_ASIC48];
	}

	force_write = 0;
	if (asic != chip->asic_code) {
		int err;
		/* Load the desired ASIC (load_asic_generic() can sleep) */
		spin_unlock_irq(&chip->lock);
		err = load_asic_generic(chip, DSP_FNC_LOAD_MONA_PCI_CARD_ASIC,
					asic);
		spin_lock_irq(&chip->lock);

		if (err < 0)
			return err;
		chip->asic_code = asic;
		force_write = 1;
	}

	/* Compute the new control register value */
	clock = 0;
	control_reg = le32_to_cpu(chip->comm_page->control_register);
	control_reg &= GML_CLOCK_CLEAR_MASK;
	control_reg &= GML_SPDIF_RATE_CLEAR_MASK;

	switch (rate) {
	case 96000:
		clock = GML_96KHZ;
		break;
	case 88200:
		clock = GML_88KHZ;
		break;
	case 48000:
		clock = GML_48KHZ | GML_SPDIF_SAMPLE_RATE1;
		break;
	case 44100:
		clock = GML_44KHZ;
		/* Professional mode */
		if (control_reg & GML_SPDIF_PRO_MODE)
			clock |= GML_SPDIF_SAMPLE_RATE0;
		break;
	case 32000:
		clock = GML_32KHZ | GML_SPDIF_SAMPLE_RATE0 |
			GML_SPDIF_SAMPLE_RATE1;
		break;
	case 22050:
		clock = GML_22KHZ;
		break;
	case 16000:
		clock = GML_16KHZ;
		break;
	case 11025:
		clock = GML_11KHZ;
		break;
	case 8000:
		clock = GML_8KHZ;
		break;
	default:
		DE_ACT(("set_sample_rate: %d invalid!\n", rate));
		return -EINVAL;
	}

	control_reg |= clock;

	chip->comm_page->sample_rate = cpu_to_le32(rate);	/* ignored by the DSP */
	chip->sample_rate = rate;
	DE_ACT(("set_sample_rate: %d clock %d\n", rate, clock));

	return write_control_reg(chip, control_reg, force_write);
}


static int set_input_clock(struct echoaudio *chip, u16 clock)
{
	u32 control_reg, clocks_from_dsp;
	int err;

	DE_ACT(("set_input_clock:\n"));

	/* Prevent two simultaneous calls to switch_asic() */
	if (atomic_read(&chip->opencount))
		return -EAGAIN;

	/* Mask off the clock select bits */
	control_reg = le32_to_cpu(chip->comm_page->control_register) &
		GML_CLOCK_CLEAR_MASK;
	clocks_from_dsp = le32_to_cpu(chip->comm_page->status_clocks);

	switch (clock) {
	case ECHO_CLOCK_INTERNAL:
		DE_ACT(("Set Mona clock to INTERNAL\n"));
		chip->input_clock = ECHO_CLOCK_INTERNAL;
		return set_sample_rate(chip, chip->sample_rate);
	case ECHO_CLOCK_SPDIF:
		if (chip->digital_mode == DIGITAL_MODE_ADAT)
			return -EAGAIN;
		spin_unlock_irq(&chip->lock);
		err = switch_asic(chip, clocks_from_dsp &
				  GML_CLOCK_DETECT_BIT_SPDIF96);
		spin_lock_irq(&chip->lock);
		if (err < 0)
			return err;
		DE_ACT(("Set Mona clock to SPDIF\n"));
		control_reg |= GML_SPDIF_CLOCK;
		if (clocks_from_dsp & GML_CLOCK_DETECT_BIT_SPDIF96)
			control_reg |= GML_DOUBLE_SPEED_MODE;
		else
			control_reg &= ~GML_DOUBLE_SPEED_MODE;
		break;
	case ECHO_CLOCK_WORD:
		DE_ACT(("Set Mona clock to WORD\n"));
		spin_unlock_irq(&chip->lock);
		err = switch_asic(chip, clocks_from_dsp &
				  GML_CLOCK_DETECT_BIT_WORD96);
		spin_lock_irq(&chip->lock);
		if (err < 0)
			return err;
		control_reg |= GML_WORD_CLOCK;
		if (clocks_from_dsp & GML_CLOCK_DETECT_BIT_WORD96)
			control_reg |= GML_DOUBLE_SPEED_MODE;
		else
			control_reg &= ~GML_DOUBLE_SPEED_MODE;
		break;
	case ECHO_CLOCK_ADAT:
		DE_ACT(("Set Mona clock to ADAT\n"));
		if (chip->digital_mode != DIGITAL_MODE_ADAT)
			return -EAGAIN;
		control_reg |= GML_ADAT_CLOCK;
		control_reg &= ~GML_DOUBLE_SPEED_MODE;
		break;
	default:
		DE_ACT(("Input clock 0x%x not supported for Mona\n", clock));
		return -EINVAL;
	}

	chip->input_clock = clock;
	return write_control_reg(chip, control_reg, TRUE);
}


static int dsp_set_digital_mode(struct echoaudio *chip, u8 mode)
{
	u32 control_reg;
	int err, incompatible_clock;

	/* Set clock to "internal" if it's not compatible with the new mode */
	incompatible_clock = FALSE;
	switch (mode) {
	case DIGITAL_MODE_SPDIF_OPTICAL:
	case DIGITAL_MODE_SPDIF_RCA:
		if (chip->input_clock == ECHO_CLOCK_ADAT)
			incompatible_clock = TRUE;
		break;
	case DIGITAL_MODE_ADAT:
		if (chip->input_clock == ECHO_CLOCK_SPDIF)
			incompatible_clock = TRUE;
		break;
	default:
		DE_ACT(("Digital mode not supported: %d\n", mode));
		return -EINVAL;
	}

	spin_lock_irq(&chip->lock);

	if (incompatible_clock) {	/* Switch to 48KHz, internal */
		chip->sample_rate = 48000;
		set_input_clock(chip, ECHO_CLOCK_INTERNAL);
	}

	/* Clear the current digital mode */
	control_reg = le32_to_cpu(chip->comm_page->control_register);
	control_reg &= GML_DIGITAL_MODE_CLEAR_MASK;

	/* Tweak the control reg */
	switch (mode) {
	case DIGITAL_MODE_SPDIF_OPTICAL:
		control_reg |= GML_SPDIF_OPTICAL_MODE;
		break;
	case DIGITAL_MODE_SPDIF_RCA:
		/* GML_SPDIF_OPTICAL_MODE bit cleared */
		break;
	case DIGITAL_MODE_ADAT:
		/* If the current ASIC is the 96KHz ASIC, switch the ASIC
		   and set to 48 KHz */
		if (chip->asic_code == &card_fw[FW_MONA_361_1_ASIC96] ||
		    chip->asic_code == &card_fw[FW_MONA_301_1_ASIC96]) {
			set_sample_rate(chip, 48000);
		}
		control_reg |= GML_ADAT_MODE;
		control_reg &= ~GML_DOUBLE_SPEED_MODE;
		break;
	}

	err = write_control_reg(chip, control_reg, FALSE);
	spin_unlock_irq(&chip->lock);
	if (err < 0)
		return err;
	chip->digital_mode = mode;

	DE_ACT(("set_digital_mode to %d\n", mode));
	return incompatible_clock;
}