mirror of https://gitee.com/openkylin/linux.git
116 lines
2.9 KiB
C
116 lines
2.9 KiB
C
/*
|
|
* 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 of_device_id stm32_sai_ids[] = {
|
|
{ .compatible = "st,stm32f4-sai", .data = (void *)SAI_STM32F4 },
|
|
{}
|
|
};
|
|
|
|
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->version = (enum stm32_sai_version)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(&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");
|