diff options
Diffstat (limited to 'sound/soc/stm/stm32_sai.c')
| -rw-r--r-- | sound/soc/stm/stm32_sai.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/sound/soc/stm/stm32_sai.c b/sound/soc/stm/stm32_sai.c new file mode 100644 index 000000000000..2a27a26bf7a1 --- /dev/null +++ b/sound/soc/stm/stm32_sai.c @@ -0,0 +1,115 @@ +/* + * 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"); |