2 * STM32 ALSA SoC Digital Audio Interface (SAI) driver.
4 * Copyright (C) 2016, STMicroelectronics - All Rights Reserved
5 * Author(s): Olivier Moysan <olivier.moysan@st.com> for STMicroelectronics.
7 * License terms: GPL V2.0.
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License version 2 as published by
11 * the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
19 #include <linux/bitfield.h>
20 #include <linux/clk.h>
21 #include <linux/delay.h>
22 #include <linux/module.h>
23 #include <linux/of_platform.h>
24 #include <linux/reset.h>
26 #include <sound/dmaengine_pcm.h>
27 #include <sound/core.h>
29 #include "stm32_sai.h"
31 static const struct stm32_sai_conf stm32_sai_conf_f4 = {
32 .version = SAI_STM32F4,
36 static const struct stm32_sai_conf stm32_sai_conf_h7 = {
37 .version = SAI_STM32H7,
41 static const struct of_device_id stm32_sai_ids[] = {
42 { .compatible = "st,stm32f4-sai", .data = (void *)&stm32_sai_conf_f4 },
43 { .compatible = "st,stm32h7-sai", .data = (void *)&stm32_sai_conf_h7 },
47 static int stm32_sai_sync_conf_client(struct stm32_sai_data *sai, int synci)
51 /* Enable peripheral clock to allow GCR register access */
52 ret = clk_prepare_enable(sai->pclk);
54 dev_err(&sai->pdev->dev, "failed to enable clock: %d\n", ret);
58 writel_relaxed(FIELD_PREP(SAI_GCR_SYNCIN_MASK, (synci - 1)), sai->base);
60 clk_disable_unprepare(sai->pclk);
65 static int stm32_sai_sync_conf_provider(struct stm32_sai_data *sai, int synco)
70 /* Enable peripheral clock to allow GCR register access */
71 ret = clk_prepare_enable(sai->pclk);
73 dev_err(&sai->pdev->dev, "failed to enable clock: %d\n", ret);
77 dev_dbg(&sai->pdev->dev, "Set %s%s as synchro provider\n",
78 sai->pdev->dev.of_node->name,
79 synco == STM_SAI_SYNC_OUT_A ? "A" : "B");
81 prev_synco = FIELD_GET(SAI_GCR_SYNCOUT_MASK, readl_relaxed(sai->base));
82 if (prev_synco != STM_SAI_SYNC_OUT_NONE && synco != prev_synco) {
83 dev_err(&sai->pdev->dev, "%s%s already set as sync provider\n",
84 sai->pdev->dev.of_node->name,
85 prev_synco == STM_SAI_SYNC_OUT_A ? "A" : "B");
86 clk_disable_unprepare(sai->pclk);
90 writel_relaxed(FIELD_PREP(SAI_GCR_SYNCOUT_MASK, synco), sai->base);
92 clk_disable_unprepare(sai->pclk);
97 static int stm32_sai_set_sync(struct stm32_sai_data *sai_client,
98 struct device_node *np_provider,
101 struct platform_device *pdev = of_find_device_by_node(np_provider);
102 struct stm32_sai_data *sai_provider;
106 dev_err(&sai_client->pdev->dev,
107 "Device not found for node %s\n", np_provider->name);
111 sai_provider = platform_get_drvdata(pdev);
113 dev_err(&sai_client->pdev->dev,
114 "SAI sync provider data not found\n");
119 /* Configure sync client */
120 ret = stm32_sai_sync_conf_client(sai_client, synci);
124 /* Configure sync provider */
125 ret = stm32_sai_sync_conf_provider(sai_provider, synco);
128 put_device(&pdev->dev);
132 static int stm32_sai_probe(struct platform_device *pdev)
134 struct stm32_sai_data *sai;
135 struct reset_control *rst;
136 struct resource *res;
137 const struct of_device_id *of_id;
139 sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL);
143 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
144 sai->base = devm_ioremap_resource(&pdev->dev, res);
145 if (IS_ERR(sai->base))
146 return PTR_ERR(sai->base);
148 of_id = of_match_device(stm32_sai_ids, &pdev->dev);
150 sai->conf = (struct stm32_sai_conf *)of_id->data;
154 if (!STM_SAI_IS_F4(sai)) {
155 sai->pclk = devm_clk_get(&pdev->dev, "pclk");
156 if (IS_ERR(sai->pclk)) {
157 dev_err(&pdev->dev, "missing bus clock pclk\n");
158 return PTR_ERR(sai->pclk);
162 sai->clk_x8k = devm_clk_get(&pdev->dev, "x8k");
163 if (IS_ERR(sai->clk_x8k)) {
164 dev_err(&pdev->dev, "missing x8k parent clock\n");
165 return PTR_ERR(sai->clk_x8k);
168 sai->clk_x11k = devm_clk_get(&pdev->dev, "x11k");
169 if (IS_ERR(sai->clk_x11k)) {
170 dev_err(&pdev->dev, "missing x11k parent clock\n");
171 return PTR_ERR(sai->clk_x11k);
175 sai->irq = platform_get_irq(pdev, 0);
177 dev_err(&pdev->dev, "no irq for node %s\n", pdev->name);
182 rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);
184 reset_control_assert(rst);
186 reset_control_deassert(rst);
190 sai->set_sync = &stm32_sai_set_sync;
191 platform_set_drvdata(pdev, sai);
193 return devm_of_platform_populate(&pdev->dev);
196 MODULE_DEVICE_TABLE(of, stm32_sai_ids);
198 static struct platform_driver stm32_sai_driver = {
200 .name = "st,stm32-sai",
201 .of_match_table = stm32_sai_ids,
203 .probe = stm32_sai_probe,
206 module_platform_driver(stm32_sai_driver);
208 MODULE_DESCRIPTION("STM32 Soc SAI Interface");
209 MODULE_AUTHOR("Olivier Moysan <olivier.moysan@st.com>");
210 MODULE_ALIAS("platform:st,stm32-sai");
211 MODULE_LICENSE("GPL v2");