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
45 struct 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
51 struct 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
68 extern const struct dev_pm_ops loongson_i2s_pm;
69 extern struct snd_soc_dai_driver loongson_i2s_dai;
70
71 #endif
72
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