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/*

 * Copyright 2008 Advanced Micro Devices, Inc.

 * Copyright 2008 Red Hat Inc.

 * Copyright 2009 Christian König.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR

 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,

 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

 * OTHER DEALINGS IN THE SOFTWARE.

 *

 * Authors: Christian König

 */

#include "drmP.h"

#include "radeon.h"

#include "radeon_reg.h"

#include "atom.h"

#define AUDIO_TIMER_INTERVALL 100 /* 1/10 sekund should be enough */

/*

 * check if the chipset is supported

 */

static int r600_audio_chipset_supported(struct radeon_device *rdev)

{

	return rdev->family >= CHIP_R600

		|| rdev->family == CHIP_RS600

		|| rdev->family == CHIP_RS690

		|| rdev->family == CHIP_RS740;

}

/*

 * current number of channels

 */

static int r600_audio_channels(struct radeon_device *rdev)

{

	return (RREG32(R600_AUDIO_RATE_BPS_CHANNEL) & 0x7) + 1;

}

/*

 * current bits per sample

 */

static int r600_audio_bits_per_sample(struct radeon_device *rdev)

{

	uint32_t value = (RREG32(R600_AUDIO_RATE_BPS_CHANNEL) & 0xF0) >> 4;

	switch (value) {

	case 0x0: return  8;

	case 0x1: return 16;

	case 0x2: return 20;

	case 0x3: return 24;

	case 0x4: return 32;

	}

	DRM_ERROR("Unknown bits per sample 0x%x using 16 instead.\n", (int)value);

	return 16;

}

/*

 * current sampling rate in HZ

 */

static int r600_audio_rate(struct radeon_device *rdev)

{

	uint32_t value = RREG32(R600_AUDIO_RATE_BPS_CHANNEL);

	uint32_t result;

	if (value & 0x4000)

		result = 44100;

	else

		result = 48000;

	result *= ((value >> 11) & 0x7) + 1;

	result /= ((value >> 8) & 0x7) + 1;

	return result;

}

/*

 * iec 60958 status bits

 */

static uint8_t r600_audio_status_bits(struct radeon_device *rdev)

{

	return RREG32(R600_AUDIO_STATUS_BITS) & 0xff;

}

/*

 * iec 60958 category code

 */

static uint8_t r600_audio_category_code(struct radeon_device *rdev)

{

	return (RREG32(R600_AUDIO_STATUS_BITS) >> 8) & 0xff;

}

/*

 * update all hdmi interfaces with current audio parameters

 */

static void r600_audio_update_hdmi(unsigned long param)

{

	struct radeon_device *rdev = (struct radeon_device *)param;

	struct drm_device *dev = rdev->ddev;

	int channels = r600_audio_channels(rdev);

	int rate = r600_audio_rate(rdev);

	int bps = r600_audio_bits_per_sample(rdev);

	uint8_t status_bits = r600_audio_status_bits(rdev);

	uint8_t category_code = r600_audio_category_code(rdev);

	struct drm_encoder *encoder;

	int changes = 0;

	changes |= channels != rdev->audio_channels;

	changes |= rate != rdev->audio_rate;

	changes |= bps != rdev->audio_bits_per_sample;

	changes |= status_bits != rdev->audio_status_bits;

	changes |= category_code != rdev->audio_category_code;

	if (changes) {

		rdev->audio_channels = channels;

		rdev->audio_rate = rate;

		rdev->audio_bits_per_sample = bps;

		rdev->audio_status_bits = status_bits;

		rdev->audio_category_code = category_code;

	}

	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {

		if (changes || r600_hdmi_buffer_status_changed(encoder))

			r600_hdmi_update_audio_settings(

				encoder, channels,

				rate, bps, status_bits,

				category_code);

	}

//   mod_timer(&rdev->audio_timer,

//       jiffies + msecs_to_jiffies(AUDIO_TIMER_INTERVALL));

}

/*

 * turn on/off audio engine

 */

static void r600_audio_engine_enable(struct radeon_device *rdev, bool enable)

{

	DRM_INFO("%s audio support", enable ? "Enabling" : "Disabling");

	WREG32_P(R600_AUDIO_ENABLE, enable ? 0x81000000 : 0x0, ~0x81000000);

}

/*

 * initialize the audio vars and register the update timer

 */

int r600_audio_init(struct radeon_device *rdev)

{

	if (!radeon_audio || !r600_audio_chipset_supported(rdev))

		return 0;

	r600_audio_engine_enable(rdev, true);

	rdev->audio_channels = -1;

	rdev->audio_rate = -1;

	rdev->audio_bits_per_sample = -1;

	rdev->audio_status_bits = 0;

	rdev->audio_category_code = 0;

//   setup_timer(

//       &rdev->audio_timer,

//       r600_audio_update_hdmi,

//       (unsigned long)rdev);

//   mod_timer(&rdev->audio_timer, jiffies + 1);

	return 0;

}

/*

 * determin how the encoders and audio interface is wired together

 */

int r600_audio_tmds_index(struct drm_encoder *encoder)

{

	struct drm_device *dev = encoder->dev;

	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);

	struct drm_encoder *other;

	switch (radeon_encoder->encoder_id) {

	case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_TMDS1:

	case ENCODER_OBJECT_ID_INTERNAL_UNIPHY:

	case ENCODER_OBJECT_ID_INTERNAL_UNIPHY1:

		return 0;

	case ENCODER_OBJECT_ID_INTERNAL_LVTM1:

		/* special case check if an TMDS1 is present */

		list_for_each_entry(other, &dev->mode_config.encoder_list, head) {

			if (to_radeon_encoder(other)->encoder_id ==

				ENCODER_OBJECT_ID_INTERNAL_TMDS1)

				return 1;

		}

		return 0;

	case ENCODER_OBJECT_ID_INTERNAL_UNIPHY2:

	case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_LVTMA:

		return 1;

	default:

		DRM_ERROR("Unsupported encoder type 0x%02X\n",

			  radeon_encoder->encoder_id);

		return -1;

	}

}

/*

 * atach the audio codec to the clock source of the encoder

 */

void r600_audio_set_clock(struct drm_encoder *encoder, int clock)

{

	struct drm_device *dev = encoder->dev;

	struct radeon_device *rdev = dev->dev_private;

	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);

	int base_rate = 48000;

	switch (radeon_encoder->encoder_id) {

	case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_TMDS1:

	case ENCODER_OBJECT_ID_INTERNAL_LVTM1:

		WREG32_P(R600_AUDIO_TIMING, 0, ~0x301);

		break;

	case ENCODER_OBJECT_ID_INTERNAL_UNIPHY:

	case ENCODER_OBJECT_ID_INTERNAL_UNIPHY1:

	case ENCODER_OBJECT_ID_INTERNAL_UNIPHY2:

	case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_LVTMA:

		WREG32_P(R600_AUDIO_TIMING, 0x100, ~0x301);

		break;

	default:

		DRM_ERROR("Unsupported encoder type 0x%02X\n",

			  radeon_encoder->encoder_id);

		return;

	}

	switch (r600_audio_tmds_index(encoder)) {

	case 0:

		WREG32(R600_AUDIO_PLL1_MUL, base_rate*50);

		WREG32(R600_AUDIO_PLL1_DIV, clock*100);

		WREG32(R600_AUDIO_CLK_SRCSEL, 0);

		break;

	case 1:

		WREG32(R600_AUDIO_PLL2_MUL, base_rate*50);

		WREG32(R600_AUDIO_PLL2_DIV, clock*100);

		WREG32(R600_AUDIO_CLK_SRCSEL, 1);

		break;

	}

}

/*

 * release the audio timer

 * TODO: How to do this correctly on SMP systems?

 */

void r600_audio_fini(struct radeon_device *rdev)

{

	if (!radeon_audio || !r600_audio_chipset_supported(rdev))

		return;

//	del_timer(&rdev->audio_timer);

	r600_audio_engine_enable(rdev, false);

}