// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2019 MediaTek Inc.
 * Author: Michael Hsiao <michael.hsiao@mediatek.com>
 */

/*******************************************************************************
 *
 * Filename:
 * ---------
 *	mt-soc-pcm-voice-usb-echoref.c
 *
 * Project:
 * --------
 *	MT6797
 *
 * Description:
 * ------------
 *	Platform driver for usb phone call echo reference path
 *
 * Author:
 * -------
 *	Kai Chieh Chuang
 *
 *------------------------------------------------------------------------------
 *
 *
 ******************************************************************************
 */

/*****************************************************************************
 *                     C O M P I L E R   F L A G S
 *****************************************************************************/

/*****************************************************************************
 *                E X T E R N A L   R E F E R E N C E S
 *****************************************************************************/

#include "mtk-auddrv-afe.h"
#include "mtk-auddrv-clk.h"
#include "mtk-auddrv-common-func.h"
#include "mtk-auddrv-common.h"
#include "mtk-auddrv-def.h"
#include "mtk-soc-afe-control.h"
#include "mtk-soc-digital-type.h"
#include "mtk-soc-pcm-common.h"
#include "mtk-soc-pcm-platform.h"
#include <linux/dma-mapping.h>

#if 0
/* debug */
#define NUM_DBG_LOG 60
#define DBG_LOG_LENGTH 256

struct usb_dbg_log {
	unsigned int idx;
	char log[DBG_LOG_LENGTH];
};

static struct usb_dbg_log dbg_log[NUM_DBG_LOG];
static unsigned int dbg_log_idx;

static void print_usb_dbg_log(void)
{
	unsigned int i = 0;

	for (i = 0; i < NUM_DBG_LOG; i++) {
		pr_debug("%s(), idx %u, %s\n",
		       __func__, dbg_log[i].idx, dbg_log[i].log);
	}
}
#endif
/*
 *    function implementation
 */
static bool usb_prepare_done[2] = {false, false};
static bool usb_use_dram;
static int usb_mem_blk[2] = {Soc_Aud_Digital_Block_MEM_DL1,
			     Soc_Aud_Digital_Block_MEM_AWB};

static struct snd_pcm_hardware mtk_pcm_hardware = {
	.info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
		 SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
	.formats = SND_SOC_ADV_MT_FMTS,
	.rates = SOC_HIGH_USE_RATE,
	.rate_min = SOC_HIGH_USE_RATE_MIN,
	.rate_max = SOC_HIGH_USE_RATE_MAX,
	.channels_min = SOC_NORMAL_USE_CHANNELS_MIN,
	.channels_max = SOC_NORMAL_USE_CHANNELS_MAX,
	.buffer_bytes_max = MAX_BUFFER_SIZE,
	.period_bytes_max = MAX_PERIOD_SIZE,
	.periods_min = 2,
	.periods_max = 256,
	.fifo_size = 0,
};

static int usb_md_select;
static const char *const md_choose[] = {"md1", "md2"};
static const struct soc_enum speech_usb_enum[] = {
	SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(md_choose), md_choose),
};

static int Audio_USB_MD_Select_Control_Get(struct snd_kcontrol *kcontrol,
					   struct snd_ctl_elem_value *ucontrol)
{
	pr_debug("%s(), usb_md_select = %d\n", __func__, usb_md_select);
	ucontrol->value.integer.value[0] = usb_md_select;
	return 0;
}

static int Audio_USB_MD_Select_Control_Set(struct snd_kcontrol *kcontrol,
					   struct snd_ctl_elem_value *ucontrol)
{
	if (ucontrol->value.enumerated.item[0] > ARRAY_SIZE(md_choose)) {
		pr_warn("return -EINVAL\n");
		return -EINVAL;
	}
	usb_md_select = ucontrol->value.integer.value[0];
	pr_debug("%s(), usb_md_select = %d\n", __func__, usb_md_select);
	return 0;
}

enum USB_DBG_TYPE {
	USB_DBG_ASSERT_AT_STOP = 0x1 << 0,
};

static int usb_debug_enable;
static int Audio_USB_Debug_Get(struct snd_kcontrol *kcontrol,
			       struct snd_ctl_elem_value *ucontrol)
{
	ucontrol->value.integer.value[0] = usb_debug_enable;
	return 0;
}

static int Audio_USB_Debug_Set(struct snd_kcontrol *kcontrol,
			       struct snd_ctl_elem_value *ucontrol)
{
	usb_debug_enable = ucontrol->value.integer.value[0];
	pr_debug("%s(), usb_debug_enable = 0x%x\n", __func__, usb_debug_enable);

	return 0;
}

static const struct snd_kcontrol_new speech_usb_controls[] = {
	SOC_ENUM_EXT("USB_EchoRef_Modem_Select", speech_usb_enum[0],
		     Audio_USB_MD_Select_Control_Get,
		     Audio_USB_MD_Select_Control_Set),
	SOC_SINGLE_EXT("USB_EchoRef_Voice_Debug", SND_SOC_NOPM, 0, 0xFFFFFFFF,
		       0, Audio_USB_Debug_Get, Audio_USB_Debug_Set),
};

static int mtk_usb_echoref_close(struct snd_pcm_substream *substream)
{
	int stream = substream->stream;

	pr_debug("%s(), stream %d, prepare %d\n", __func__, stream,
		usb_prepare_done[stream]);

	if (usb_prepare_done[substream->stream]) {
		usb_prepare_done[substream->stream] = false;
		RemoveMemifSubStream(usb_mem_blk[stream], substream);

		if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
			if (usb_md_select) {
				SetIntfConnection(
					Soc_Aud_InterCon_DisConnect,
					Soc_Aud_AFE_IO_Block_MEM_DL1_CH1,
					Soc_Aud_AFE_IO_Block_MODEM_PCM_1_O_CH4);
			} else {
				SetIntfConnection(
					Soc_Aud_InterCon_DisConnect,
					Soc_Aud_AFE_IO_Block_MEM_DL1_CH1,
					Soc_Aud_AFE_IO_Block_MODEM_PCM_2_O_CH4);
			}

			/* resume pbuf size */
			set_memif_pbuf_size(usb_mem_blk[stream],
					    MEMIF_PBUF_SIZE_256_BYTES);
		}
	}

	EnableAfe(false);
	AudDrv_Clk_Off();

	return 0;
}

static int mtk_usb_echoref_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	int ret = 0;

	AudDrv_Clk_On();

	pr_debug("%s()\n", __func__);

	runtime->hw = mtk_pcm_hardware;
	memcpy((void *)(&(runtime->hw)), (void *)&mtk_pcm_hardware,
	       sizeof(struct snd_pcm_hardware));

	ret = snd_pcm_hw_constraint_integer(runtime,
					    SNDRV_PCM_HW_PARAM_PERIODS);

	if (ret < 0)
		pr_debug("snd_pcm_hw_constraint_integer failed\n");

	if (ret < 0) {
		mtk_usb_echoref_close(substream);
		return ret;
	}

	pr_debug("%s(), return\n", __func__);
	return 0;
}

static int mtk_usb_echoref_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	int stream = substream->stream;

	pr_debug("%s(), rate = %d, ch= %d psize = %lu, prepare %d\n",
		__func__, runtime->rate, runtime->channels,
		runtime->period_size, usb_prepare_done[stream]);

	if (!usb_prepare_done[stream]) {
		SetMemifSubStream(usb_mem_blk[stream], substream);

		/* set memif format */
		if (runtime->format == SNDRV_PCM_FORMAT_S32_LE ||
		    runtime->format == SNDRV_PCM_FORMAT_U32_LE)
			SetMemIfFetchFormatPerSample(
				usb_mem_blk[stream],
				AFE_WLEN_32_BIT_ALIGN_8BIT_0_24BIT_DATA);
		else
			SetMemIfFetchFormatPerSample(usb_mem_blk[stream],
						     AFE_WLEN_16_BIT);

		SetSampleRate(usb_mem_blk[stream], runtime->rate);
		SetChannels(usb_mem_blk[stream], runtime->channels);
		if (runtime->channels == 1)
			SetMemifMonoSel(usb_mem_blk[stream], false);

		/* set pbuf size for latency */
		if (stream == SNDRV_PCM_STREAM_PLAYBACK)
			set_memif_pbuf_size(usb_mem_blk[stream],
					    MEMIF_PBUF_SIZE_32_BYTES);

		/* set connection */
		if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
			if (usb_md_select) {
				SetIntfConnection(
					Soc_Aud_InterCon_Connection,
					Soc_Aud_AFE_IO_Block_MEM_DL1_CH1,
					Soc_Aud_AFE_IO_Block_MODEM_PCM_1_O_CH4);
			} else {
				SetIntfConnection(
					Soc_Aud_InterCon_Connection,
					Soc_Aud_AFE_IO_Block_MEM_DL1_CH1,
					Soc_Aud_AFE_IO_Block_MODEM_PCM_2_O_CH4);
			}
		}

		usb_prepare_done[stream] = true;
	}

	ClearMemBlock(usb_mem_blk[stream]);

	EnableAfe(true);
	return 0;
}

static int mtk_usb_echoref_hw_params(struct snd_pcm_substream *substream,
				     struct snd_pcm_hw_params *hw_params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	int stream = substream->stream;
	int ret = 0;

	runtime->dma_bytes = params_buffer_bytes(hw_params);

	ret = snd_pcm_lib_malloc_pages(substream, runtime->dma_bytes);
	if (ret < 0) {
		pr_err("%s(), allocate dram fail, ret %d\n", __func__, ret);
		return ret;
	}
	usb_use_dram = true;
	SetHighAddr(usb_mem_blk[stream], true, substream->runtime->dma_addr);
	AudDrv_Emi_Clk_On();

	set_mem_block(substream, hw_params,
		      Get_Mem_ControlT(usb_mem_blk[stream]),
		      usb_mem_blk[stream]);

	pr_debug("%s, stream %d, dma_bytes = %zu,area = %p,addr = %lx,dram %d\n",
		__func__, stream, runtime->dma_bytes,
		runtime->dma_area, (long)runtime->dma_addr, usb_use_dram);

	return ret;
}

static int mtk_usb_echoref_hw_free(struct snd_pcm_substream *substream)
{
	pr_debug("%s(), substream = %p, stream %d\n", __func__, substream,
		substream->stream);

	if (usb_use_dram) {
		AudDrv_Emi_Clk_Off();
		usb_use_dram = false;
		return snd_pcm_lib_free_pages(substream);
	} else {
		return freeAudioSram((void *)substream);
	}
}

static int mtk_usb_echoref_start(struct snd_pcm_substream *substream)
{
	int stream = substream->stream;

	pr_debug("%s(), stream %d\n", __func__, stream);

	SetMemoryPathEnable(usb_mem_blk[stream], true);

	/* here to set interrupt */
	irq_add_user(substream, irq_request_number(usb_mem_blk[stream]),
		     substream->runtime->rate, substream->runtime->period_size);

	EnableAfe(true);

	return 0;
}

static int mtk_usb_echoref_stop(struct snd_pcm_substream *substream)
{
	int stream = substream->stream;

	pr_debug("%s(), stream %d\n", __func__, stream);

#if 0
	if (usb_debug_enable & USB_DBG_ASSERT_AT_STOP) {
		if (stream == SNDRV_PCM_STREAM_PLAYBACK)
			print_usb_dbg_log();
	}
#endif

	irq_remove_user(substream, irq_request_number(usb_mem_blk[stream]));

	SetMemoryPathEnable(usb_mem_blk[stream], false);

	ClearMemBlock(usb_mem_blk[stream]);
	return 0;
}

static int mtk_usb_echoref_trigger(struct snd_pcm_substream *substream, int cmd)
{

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
		return mtk_usb_echoref_start(substream);
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		return mtk_usb_echoref_stop(substream);
	}
	return -EINVAL;
}

static snd_pcm_uframes_t
mtk_usb_echoref_pointer(struct snd_pcm_substream *substream)
{
	unsigned int hw_ptr;
	int stream = substream->stream;
	struct afe_mem_control_t *mem_ctl =
		Get_Mem_ControlT(usb_mem_blk[stream]);
	struct afe_block_t *Afe_Block = &mem_ctl->rBlock;

	hw_ptr = Afe_Get_Reg(AFE_DL1_CUR);
	if (hw_ptr == 0) {
		pr_info("%s(), hw_ptr == 0\n", __func__);
		hw_ptr = Afe_Block->pucPhysBufAddr;
	}

	return bytes_to_frames(substream->runtime,
			       hw_ptr - Afe_Block->pucPhysBufAddr);
}

static struct snd_pcm_ops mtk_usb_echoref_ops = {
	.open = mtk_usb_echoref_open,
	.close = mtk_usb_echoref_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = mtk_usb_echoref_hw_params,
	.hw_free = mtk_usb_echoref_hw_free,
	.prepare = mtk_usb_echoref_prepare,
	.trigger = mtk_usb_echoref_trigger,
	.pointer = mtk_usb_echoref_pointer,
	.copy_user = mtk_afe_pcm_copy,
};

static int mtk_usb_echoref_component_probe(struct snd_soc_component *component)
{
	snd_soc_add_component_controls(component, speech_usb_controls,
				      ARRAY_SIZE(speech_usb_controls));
	return 0;
}

static int mtk_usb_echoref_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
	size_t size;
	struct snd_card *card = rtd->card->snd_card;
	struct snd_pcm *pcm = rtd->pcm;

	size = mtk_pcm_hardware.buffer_bytes_max;

	return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
						     card->dev, size, size);
}

static void mtk_usb_echoref_pcm_free(struct snd_pcm *pcm)
{
	snd_pcm_lib_preallocate_free_for_all(pcm);
}

static struct snd_soc_component_driver mtk_soc_usb_echoref_component = {
	.name = AFE_PCM_NAME,
	.ops = &mtk_usb_echoref_ops,
	.probe = mtk_usb_echoref_component_probe,
	.pcm_new = mtk_usb_echoref_pcm_new,
	.pcm_free = mtk_usb_echoref_pcm_free,
};

static int mtk_usb_echoref_probe(struct platform_device *pdev)
{
	pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);

	if (!pdev->dev.dma_mask)
		pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;

	if (pdev->dev.of_node)
		dev_set_name(&pdev->dev, "%s", MT_SOC_VOICE_USB_ECHOREF);
	pdev->name = pdev->dev.kobj.name;

	pr_debug("%s: dev name %s\n", __func__, dev_name(&pdev->dev));
	return snd_soc_register_component(&pdev->dev,
					  &mtk_soc_usb_echoref_component,
					  NULL,
					  0);
}

static int mtk_usb_echoref_remove(struct platform_device *pdev)
{
	pr_debug("%s()\n", __func__);
	snd_soc_unregister_component(&pdev->dev);
	return 0;
}

static const struct of_device_id mt_soc_pcm_usb_echoref_of_ids[] = {
	{
		.compatible = "mediatek,mt_soc_pcm_voice_usb_echoref",
	},
	{} };

static struct platform_driver mtk_usb_echoref_driver = {
	.driver = {

			.name = MT_SOC_VOICE_USB_ECHOREF,
			.owner = THIS_MODULE,
			.of_match_table = mt_soc_pcm_usb_echoref_of_ids,
		},
	.probe = mtk_usb_echoref_probe,
	.remove = mtk_usb_echoref_remove,
};

module_platform_driver(mtk_usb_echoref_driver);

MODULE_DESCRIPTION("AFE PCM module platform driver");
MODULE_LICENSE("GPL");