1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
/*
* STM32 ALSA SoC Digital Audio Interface (SAI) driver.
*
* Copyright (C) 2016, STMicroelectronics - All Rights Reserved
* Author(s): Olivier Moysan <olivier.moysan@st.com> for STMicroelectronics.
*
* License terms: GPL V2.0.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License 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.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/reset.h>
#include <sound/dmaengine_pcm.h>
#include <sound/core.h>
#include "stm32_sai.h"
static const struct stm32_sai_conf stm32_sai_conf_f4 = {
.version = SAI_STM32F4,
};
static const struct stm32_sai_conf stm32_sai_conf_h7 = {
.version = SAI_STM32H7,
};
static const struct of_device_id stm32_sai_ids[] = {
{ .compatible = "st,stm32f4-sai", .data = (void *)&stm32_sai_conf_f4 },
{ .compatible = "st,stm32h7-sai", .data = (void *)&stm32_sai_conf_h7 },
{}
};
static int stm32_sai_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct stm32_sai_data *sai;
struct reset_control *rst;
struct resource *res;
void __iomem *base;
const struct of_device_id *of_id;
sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL);
if (!sai)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
of_id = of_match_device(stm32_sai_ids, &pdev->dev);
if (of_id)
sai->conf = (struct stm32_sai_conf *)of_id->data;
else
return -EINVAL;
sai->clk_x8k = devm_clk_get(&pdev->dev, "x8k");
if (IS_ERR(sai->clk_x8k)) {
dev_err(&pdev->dev, "missing x8k parent clock\n");
return PTR_ERR(sai->clk_x8k);
}
sai->clk_x11k = devm_clk_get(&pdev->dev, "x11k");
if (IS_ERR(sai->clk_x11k)) {
dev_err(&pdev->dev, "missing x11k parent clock\n");
return PTR_ERR(sai->clk_x11k);
}
/* init irqs */
sai->irq = platform_get_irq(pdev, 0);
if (sai->irq < 0) {
dev_err(&pdev->dev, "no irq for node %s\n", pdev->name);
return sai->irq;
}
/* reset */
rst = reset_control_get_exclusive(&pdev->dev, NULL);
if (!IS_ERR(rst)) {
reset_control_assert(rst);
udelay(2);
reset_control_deassert(rst);
}
sai->pdev = pdev;
platform_set_drvdata(pdev, sai);
return of_platform_populate(np, NULL, NULL, &pdev->dev);
}
static int stm32_sai_remove(struct platform_device *pdev)
{
of_platform_depopulate(&pdev->dev);
return 0;
}
MODULE_DEVICE_TABLE(of, stm32_sai_ids);
static struct platform_driver stm32_sai_driver = {
.driver = {
.name = "st,stm32-sai",
.of_match_table = stm32_sai_ids,
},
.probe = stm32_sai_probe,
.remove = stm32_sai_remove,
};
module_platform_driver(stm32_sai_driver);
MODULE_DESCRIPTION("STM32 Soc SAI Interface");
MODULE_AUTHOR("Olivier Moysan <olivier.moysan@st.com>");
MODULE_ALIAS("platform:st,stm32-sai");
MODULE_LICENSE("GPL v2");
|
