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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / e6849e2fd88f16d9592059422173f7f6ab790e07 / . / drivers / sound / tegra_i2s.c
blob: 8022dbba6426bb63a3ea44bd53943620f56c53c2 [file] [log] [blame]
Simon Glassc5a120b2019-04-01 13:38:40 -0700[diff] [blame]1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright 2018 Google LLC
4 * Written by Simon Glass <sjg@chromium.org>
5 */
6#define LOG_CATEGORY UCLASS_I2S
7#define LOG_DEBUG
8
9#include <common.h>
10#include <dm.h>
11#include <i2s.h>
12#include <misc.h>
13#include <sound.h>
14#include <asm/io.h>
15#include <asm/arch-tegra/tegra_i2s.h>
16#include "tegra_i2s_priv.h"
17
18int tegra_i2s_set_cif_tx_ctrl(struct udevice *dev, u32 value)
19{
20 struct i2s_uc_priv *priv = dev_get_uclass_priv(dev);
21 struct i2s_ctlr *regs = (struct i2s_ctlr *)priv->base_address;
22
23 writel(value, &regs->cif_tx_ctrl);
24
25 return 0;
26}
27
28static void tegra_i2s_transmit_enable(struct i2s_ctlr *regs, int on)
29{
30 clrsetbits_le32(&regs->ctrl, I2S_CTRL_XFER_EN_TX,
31 on ? I2S_CTRL_XFER_EN_TX : 0);
32}
33
34static int i2s_tx_init(struct i2s_uc_priv *pi2s_tx)
35{
36 struct i2s_ctlr *regs = (struct i2s_ctlr *)pi2s_tx->base_address;
37 u32 audio_bits = (pi2s_tx->bitspersample >> 2) - 1;
38 u32 ctrl = readl(&regs->ctrl);
39
40 /* Set format to LRCK / Left Low */
41 ctrl &= ~(I2S_CTRL_FRAME_FORMAT_MASK | I2S_CTRL_LRCK_MASK);
42 ctrl |= I2S_CTRL_FRAME_FORMAT_LRCK;
43 ctrl |= I2S_CTRL_LRCK_L_LOW;
44
45 /* Disable all transmission until we are ready to transfer */
46 ctrl &= ~(I2S_CTRL_XFER_EN_TX | I2S_CTRL_XFER_EN_RX);
47
48 /* Serve as master */
49 ctrl |= I2S_CTRL_MASTER_ENABLE;
50
51 /* Configure audio bits size */
52 ctrl &= ~I2S_CTRL_BIT_SIZE_MASK;
53 ctrl |= audio_bits << I2S_CTRL_BIT_SIZE_SHIFT;
54 writel(ctrl, &regs->ctrl);
55
56 /* Timing in LRCK mode: */
57 writel(pi2s_tx->bitspersample, &regs->timing);
58
59 /* I2S mode has [TX/RX]_DATA_OFFSET both set to 1 */
60 writel(((1 << I2S_OFFSET_RX_DATA_OFFSET_SHIFT) |
61 (1 << I2S_OFFSET_TX_DATA_OFFSET_SHIFT)), &regs->offset);
62
63 /* FSYNC_WIDTH = 2 clocks wide, TOTAL_SLOTS = 2 slots per fsync */
64 writel((2 - 1) << I2S_CH_CTRL_FSYNC_WIDTH_SHIFT, &regs->ch_ctrl);
65
66 return 0;
67}
68
69static int tegra_i2s_tx_data(struct udevice *dev, void *data, uint data_size)
70{
71 struct i2s_uc_priv *priv = dev_get_uclass_priv(dev);
72 struct i2s_ctlr *regs = (struct i2s_ctlr *)priv->base_address;
73 int ret;
74
75 tegra_i2s_transmit_enable(regs, 1);
76 ret = misc_write(dev_get_parent(dev), 0, data, data_size);
77 tegra_i2s_transmit_enable(regs, 0);
78 if (ret < 0)
79 return ret;
80 else if (ret < data_size)
81 return -EIO;
82
83 return 0;
84}
85
86static int tegra_i2s_probe(struct udevice *dev)
87{
88 struct i2s_uc_priv *priv = dev_get_uclass_priv(dev);
89 ulong base;
90
91 base = dev_read_addr(dev);
92 if (base == FDT_ADDR_T_NONE) {
93 debug("%s: Missing i2s base\n", __func__);
94 return -EINVAL;
95 }
96 priv->base_address = base;
97 priv->id = 1;
98 priv->audio_pll_clk = 4800000;
99 priv->samplingrate = 48000;
100 priv->bitspersample = 16;
101 priv->channels = 2;
102 priv->rfs = 256;
103 priv->bfs = 32;
104
105 return i2s_tx_init(priv);
106}
107
108static const struct i2s_ops tegra_i2s_ops = {
109 .tx_data = tegra_i2s_tx_data,
110};
111
112static const struct udevice_id tegra_i2s_ids[] = {
113 { .compatible = "nvidia,tegra124-i2s" },
114 { }
115};
116
117U_BOOT_DRIVER(tegra_i2s) = {
118 .name = "tegra_i2s",
119 .id = UCLASS_I2S,
120 .of_match = tegra_i2s_ids,
121 .probe = tegra_i2s_probe,
122 .ops = &tegra_i2s_ops,
123};