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Diffstat (limited to 'sound/soc/stm/stm32_sai.c')
-rw-r--r--sound/soc/stm/stm32_sai.c115
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");