1. 根目录:
2. sound
3. soc
4. qcom
5. lpass.h

/*
 * Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 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.
 *
 * lpass.h - Definitions for the QTi LPASS
 */

#ifndef __LPASS_H__
#define __LPASS_H__

#include <linux/clk.h>
#include <linux/compiler.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

#define LPASS_AHBIX_CLOCK_FREQUENCY		131072000
#define LPASS_MAX_MI2S_PORTS			(8)
#define LPASS_MAX_DMA_CHANNELS			(8)

/* Both the CPU DAI and platform drivers will access this data */
struct lpass_data {

	/* AHB-I/X bus clocks inside the low-power audio subsystem (LPASS) */
	struct clk *ahbix_clk;

	/* MI2S system clock */
	struct clk *mi2s_osr_clk[LPASS_MAX_MI2S_PORTS];

	/* MI2S bit clock (derived from system clock by a divider */
	struct clk *mi2s_bit_clk[LPASS_MAX_MI2S_PORTS];

	/* low-power audio interface (LPAIF) registers */
	void __iomem *lpaif;

	/* regmap backed by the low-power audio interface (LPAIF) registers */
	struct regmap *lpaif_map;

	/* interrupts from the low-power audio interface (LPAIF) */
	int lpaif_irq;

	/* SOC specific variations in the LPASS IP integration */
	struct lpass_variant *variant;

	/* bit map to keep track of static channel allocations */
	unsigned long rdma_ch_bit_map;

	/* used it for handling interrupt per dma channel */
	struct snd_pcm_substream *substream[LPASS_MAX_DMA_CHANNELS];

	/* 8016 specific */
	struct clk *pcnoc_mport_clk;
	struct clk *pcnoc_sway_clk;
};

/* Vairant data per each SOC */
struct lpass_variant {
	u32	i2sctrl_reg_base;
	u32	i2sctrl_reg_stride;
	u32	i2s_ports;
	u32	irq_reg_base;
	u32	irq_reg_stride;
	u32	irq_ports;
	u32	rdma_reg_base;
	u32	rdma_reg_stride;
	u32	rdma_channels;

	/**
	 * on SOCs like APQ8016 the channel control bits start
	 * at different offset to ipq806x
	 **/
	u32	rdmactl_audif_start;
	/* SOC specific intialization like clocks */
	int (*init)(struct platform_device *pdev);
	int (*exit)(struct platform_device *pdev);
	int (*alloc_dma_channel)(struct lpass_data *data);
	int (*free_dma_channel)(struct lpass_data *data, int ch);

	/* SOC specific dais */
	struct snd_soc_dai_driver *dai_driver;
	int num_dai;
};

/* register the platform driver from the CPU DAI driver */
int asoc_qcom_lpass_platform_register(struct platform_device *);
int asoc_qcom_lpass_cpu_platform_remove(struct platform_device *pdev);
int asoc_qcom_lpass_cpu_platform_probe(struct platform_device *pdev);
int asoc_qcom_lpass_cpu_dai_probe(struct snd_soc_dai *dai);
extern const struct snd_soc_dai_ops asoc_qcom_lpass_cpu_dai_ops;

#endif /* __LPASS_H__ */