1 // SPDX-License-Identifier: GPL-2.0-only
3  * STM32 ALSA SoC Digital Audio Interface (SAI) driver.
5  * Copyright (C) 2016, STMicroelectronics - All Rights Reserved
22 static int stm32_sai_get_parent_clk(struct stm32_sai_data *sai);
35  * - STM32H7: rely on default settings
36  * - STM32MP1: retrieve settings from registers
47  * - do not use SAI parent clock source selection
48  * - do not use DMA burst mode
55 	{ .compatible = "st,stm32f4-sai", .data = (void *)&stm32_sai_conf_f4 },
56 	{ .compatible = "st,stm32h7-sai", .data = (void *)&stm32_sai_conf_h7 },
57 	{ .compatible = "st,stm32mp25-sai", .data = (void *)&stm32_sai_conf_mp25 },
63 	struct stm32_sai_data *sai = dev_get_drvdata(dev);  in stm32_sai_pclk_disable()  local
65 	clk_disable_unprepare(sai->pclk);  in stm32_sai_pclk_disable()
72 	struct stm32_sai_data *sai = dev_get_drvdata(dev);  in stm32_sai_pclk_enable()  local
75 	ret = clk_prepare_enable(sai->pclk);  in stm32_sai_pclk_enable()
77 		dev_err(&sai->pdev->dev, "failed to enable clock: %d\n", ret);  in stm32_sai_pclk_enable()
84 static int stm32_sai_sync_conf_client(struct stm32_sai_data *sai, int synci)  in stm32_sai_sync_conf_client()  argument
89 	ret = stm32_sai_pclk_enable(&sai->pdev->dev);  in stm32_sai_sync_conf_client()
93 	writel_relaxed(FIELD_PREP(SAI_GCR_SYNCIN_MASK, (synci - 1)), sai->base);  in stm32_sai_sync_conf_client()
95 	stm32_sai_pclk_disable(&sai->pdev->dev);  in stm32_sai_sync_conf_client()
100 static int stm32_sai_sync_conf_provider(struct stm32_sai_data *sai, int synco)  in stm32_sai_sync_conf_provider()  argument
106 	ret = stm32_sai_pclk_enable(&sai->pdev->dev);  in stm32_sai_sync_conf_provider()
110 	dev_dbg(&sai->pdev->dev, "Set %pOFn%s as synchro provider\n",  in stm32_sai_sync_conf_provider()
111 		sai->pdev->dev.of_node,  in stm32_sai_sync_conf_provider()
114 	prev_synco = FIELD_GET(SAI_GCR_SYNCOUT_MASK, readl_relaxed(sai->base));  in stm32_sai_sync_conf_provider()
116 		dev_err(&sai->pdev->dev, "%pOFn%s already set as sync provider\n",  in stm32_sai_sync_conf_provider()
117 			sai->pdev->dev.of_node,  in stm32_sai_sync_conf_provider()
119 		stm32_sai_pclk_disable(&sai->pdev->dev);  in stm32_sai_sync_conf_provider()
120 		return -EINVAL;  in stm32_sai_sync_conf_provider()
123 	writel_relaxed(FIELD_PREP(SAI_GCR_SYNCOUT_MASK, synco), sai->base);  in stm32_sai_sync_conf_provider()
125 	stm32_sai_pclk_disable(&sai->pdev->dev);  in stm32_sai_sync_conf_provider()
139 		dev_err(&sai_client->pdev->dev,  in stm32_sai_set_sync()
142 		return -ENODEV;  in stm32_sai_set_sync()
147 		dev_err(&sai_client->pdev->dev,  in stm32_sai_set_sync()
148 			"SAI sync provider data not found\n");  in stm32_sai_set_sync()
149 		ret = -EINVAL;  in stm32_sai_set_sync()
162 	put_device(&pdev->dev);  in stm32_sai_set_sync()
167 static int stm32_sai_get_parent_clk(struct stm32_sai_data *sai)  in stm32_sai_get_parent_clk()  argument
169 	struct device *dev = &sai->pdev->dev;  in stm32_sai_get_parent_clk()
171 	sai->clk_x8k = devm_clk_get(dev, "x8k");  in stm32_sai_get_parent_clk()
172 	if (IS_ERR(sai->clk_x8k)) {  in stm32_sai_get_parent_clk()
173 		if (PTR_ERR(sai->clk_x8k) != -EPROBE_DEFER)  in stm32_sai_get_parent_clk()
175 				PTR_ERR(sai->clk_x8k));  in stm32_sai_get_parent_clk()
176 		return PTR_ERR(sai->clk_x8k);  in stm32_sai_get_parent_clk()
179 	sai->clk_x11k = devm_clk_get(dev, "x11k");  in stm32_sai_get_parent_clk()
180 	if (IS_ERR(sai->clk_x11k)) {  in stm32_sai_get_parent_clk()
181 		if (PTR_ERR(sai->clk_x11k) != -EPROBE_DEFER)  in stm32_sai_get_parent_clk()
183 				PTR_ERR(sai->clk_x11k));  in stm32_sai_get_parent_clk()
184 		return PTR_ERR(sai->clk_x11k);  in stm32_sai_get_parent_clk()
192 	struct stm32_sai_data *sai;  in stm32_sai_probe()  local
198 	sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL);  in stm32_sai_probe()
199 	if (!sai)  in stm32_sai_probe()
200 		return -ENOMEM;  in stm32_sai_probe()
202 	sai->pdev = pdev;  in stm32_sai_probe()
204 	sai->base = devm_platform_ioremap_resource(pdev, 0);  in stm32_sai_probe()
205 	if (IS_ERR(sai->base))  in stm32_sai_probe()
206 		return PTR_ERR(sai->base);  in stm32_sai_probe()
208 	conf = device_get_match_data(&pdev->dev);  in stm32_sai_probe()
210 		memcpy(&sai->conf, (const struct stm32_sai_conf *)conf,  in stm32_sai_probe()
213 		return -EINVAL;  in stm32_sai_probe()
215 	if (!STM_SAI_IS_F4(sai)) {  in stm32_sai_probe()
216 		sai->pclk = devm_clk_get(&pdev->dev, "pclk");  in stm32_sai_probe()
217 		if (IS_ERR(sai->pclk))  in stm32_sai_probe()
218 			return dev_err_probe(&pdev->dev, PTR_ERR(sai->pclk),  in stm32_sai_probe()
222 	if (sai->conf.get_sai_ck_parent) {  in stm32_sai_probe()
223 		ret = sai->conf.get_sai_ck_parent(sai);  in stm32_sai_probe()
229 	sai->irq = platform_get_irq(pdev, 0);  in stm32_sai_probe()
230 	if (sai->irq < 0)  in stm32_sai_probe()
231 		return sai->irq;  in stm32_sai_probe()
234 	rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);  in stm32_sai_probe()
236 		return dev_err_probe(&pdev->dev, PTR_ERR(rst),  in stm32_sai_probe()
244 	ret = clk_prepare_enable(sai->pclk);  in stm32_sai_probe()
246 		dev_err(&pdev->dev, "failed to enable clock: %d\n", ret);  in stm32_sai_probe()
251 			readl_relaxed(sai->base + STM_SAI_IDR));  in stm32_sai_probe()
253 		val = readl_relaxed(sai->base + STM_SAI_HWCFGR);  in stm32_sai_probe()
254 		sai->conf.fifo_size = FIELD_GET(SAI_HWCFGR_FIFO_SIZE, val);  in stm32_sai_probe()
255 		sai->conf.has_spdif_pdm = !!FIELD_GET(SAI_HWCFGR_SPDIF_PDM,  in stm32_sai_probe()
258 		val = readl_relaxed(sai->base + STM_SAI_VERR);  in stm32_sai_probe()
259 		sai->conf.version = val;  in stm32_sai_probe()
261 		dev_dbg(&pdev->dev, "SAI version: %lu.%lu registered\n",  in stm32_sai_probe()
265 	clk_disable_unprepare(sai->pclk);  in stm32_sai_probe()
267 	sai->set_sync = &stm32_sai_set_sync;  in stm32_sai_probe()
268 	platform_set_drvdata(pdev, sai);  in stm32_sai_probe()
270 	return devm_of_platform_populate(&pdev->dev);  in stm32_sai_probe()
275  * When pins are shared by two sai sub instances, pins have to be defined
276  * in sai parent node. In this case, pins state is not managed by alsa fw.
281 	struct stm32_sai_data *sai = dev_get_drvdata(dev);  in stm32_sai_suspend()  local
288 	sai->gcr = readl_relaxed(sai->base);  in stm32_sai_suspend()
296 	struct stm32_sai_data *sai = dev_get_drvdata(dev);  in stm32_sai_resume()  local
303 	writel_relaxed(sai->gcr, sai->base);  in stm32_sai_resume()
318 		.name = "st,stm32-sai",
327 MODULE_DESCRIPTION("STM32 Soc SAI Interface");
329 MODULE_ALIAS("platform:st,stm32-sai");