1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * ALSA I2S interface for the Loongson platform
4 *
5 * Copyright (C) 2023 Loongson Technology Corporation Limited
6 * Author: Yingkun Meng <mengyingkun@loongson.cn>
7 */
8
9#ifndef _LOONGSON_I2S_H
10#define _LOONGSON_I2S_H
11
12#include <linux/regmap.h>
13#include <sound/dmaengine_pcm.h>
14
15/* I2S Common Registers */
16#define LS_I2S_VER	0x00 /* I2S Version */
17#define LS_I2S_CFG	0x04 /* I2S Config */
18#define LS_I2S_CTRL	0x08 /* I2S Control */
19#define LS_I2S_RX_DATA	0x0C /* I2S DMA RX Address */
20#define LS_I2S_TX_DATA	0x10 /* I2S DMA TX Address */
21
22/* 2K2000 I2S Specify Registers */
23#define LS_I2S_CFG1	0x14 /* I2S Config1 */
24
25/* 7A2000 I2S Specify Registers */
26#define LS_I2S_TX_ORDER	0x100 /* TX DMA Order */
27#define LS_I2S_RX_ORDER 0x110 /* RX DMA Order */
28
29/* Loongson I2S Control Register */
30#define I2S_CTRL_MCLK_READY	(1 << 16) /* MCLK ready */
31#define I2S_CTRL_MASTER		(1 << 15) /* Master mode */
32#define I2S_CTRL_MSB		(1 << 14) /* MSB bit order */
33#define I2S_CTRL_RX_EN		(1 << 13) /* RX enable */
34#define I2S_CTRL_TX_EN		(1 << 12) /* TX enable */
35#define I2S_CTRL_RX_DMA_EN	(1 << 11) /* DMA RX enable */
36#define I2S_CTRL_CLK_READY	(1 << 8)  /* BCLK ready */
37#define I2S_CTRL_TX_DMA_EN	(1 << 7)  /* DMA TX enable */
38#define I2S_CTRL_RESET		(1 << 4)  /* Controller soft reset */
39#define I2S_CTRL_MCLK_EN	(1 << 3)  /* Enable MCLK */
40#define I2S_CTRL_RX_INT_EN	(1 << 1)  /* RX interrupt enable */
41#define I2S_CTRL_TX_INT_EN	(1 << 0)  /* TX interrupt enable */
42
43#define LS_I2S_DRVNAME		"loongson-i2s"
44
45struct loongson_dma_data {
46	dma_addr_t dev_addr;		/* device physical address for DMA */
47	void __iomem *order_addr;	/* DMA order register */
48	int irq;			/* DMA irq */
49};
50
51struct loongson_i2s {
52	struct device *dev;
53	union {
54		struct snd_dmaengine_dai_dma_data playback_dma_data;
55		struct loongson_dma_data tx_dma_data;
56	};
57	union {
58		struct snd_dmaengine_dai_dma_data capture_dma_data;
59		struct loongson_dma_data rx_dma_data;
60	};
61	struct regmap *regmap;
62	void __iomem *reg_base;
63	u32 rev_id;
64	u32 clk_rate;
65	u32 sysclk;
66};
67
68extern const struct dev_pm_ops loongson_i2s_pm;
69extern struct snd_soc_dai_driver loongson_i2s_dai;
70
71#endif
72