1 // SPDX-License-Identifier: GPL-2.0
5  * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
20 #include "stm32-dfsdm.h"
88 	unsigned int spi_clk_out_div; /* SPI clkout divider value */
105 	ret = clk_prepare_enable(priv->clk);  in stm32_dfsdm_clk_prepare_enable()
106 	if (ret || !priv->aclk)  in stm32_dfsdm_clk_prepare_enable()
109 	ret = clk_prepare_enable(priv->aclk);  in stm32_dfsdm_clk_prepare_enable()
111 		clk_disable_unprepare(priv->clk);  in stm32_dfsdm_clk_prepare_enable()
120 	if (priv->aclk)  in stm32_dfsdm_clk_disable_unprepare()
121 		clk_disable_unprepare(priv->aclk);  in stm32_dfsdm_clk_disable_unprepare()
122 	clk_disable_unprepare(priv->clk);  in stm32_dfsdm_clk_disable_unprepare()
126  * stm32_dfsdm_start_dfsdm - start global dfsdm interface.
134 	struct device *dev = &priv->pdev->dev;  in stm32_dfsdm_start_dfsdm()
135 	unsigned int clk_div = priv->spi_clk_out_div, clk_src;  in stm32_dfsdm_start_dfsdm()
138 	if (atomic_inc_return(&priv->n_active_ch) == 1) {  in stm32_dfsdm_start_dfsdm()
146 		clk_src = priv->aclk ? 1 : 0;  in stm32_dfsdm_start_dfsdm()
147 		ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0),  in stm32_dfsdm_start_dfsdm()
153 		/* Output the SPI CLKOUT (if clk_div == 0 clock if OFF) */  in stm32_dfsdm_start_dfsdm()
154 		ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0),  in stm32_dfsdm_start_dfsdm()
161 		ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0),  in stm32_dfsdm_start_dfsdm()
169 		atomic_read(&priv->n_active_ch));  in stm32_dfsdm_start_dfsdm()
176 	atomic_dec(&priv->n_active_ch);  in stm32_dfsdm_start_dfsdm()
183  * stm32_dfsdm_stop_dfsdm - stop global DFSDM interface.
193 	if (atomic_dec_and_test(&priv->n_active_ch)) {  in stm32_dfsdm_stop_dfsdm()
195 		ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0),  in stm32_dfsdm_stop_dfsdm()
201 		/* Stop SPI CLKOUT */  in stm32_dfsdm_stop_dfsdm()
202 		ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0),  in stm32_dfsdm_stop_dfsdm()
208 		pm_runtime_put_sync(&priv->pdev->dev);  in stm32_dfsdm_stop_dfsdm()
210 	dev_dbg(&priv->pdev->dev, "%s: n_active_ch %d\n", __func__,  in stm32_dfsdm_stop_dfsdm()
211 		atomic_read(&priv->n_active_ch));  in stm32_dfsdm_stop_dfsdm()
220 	struct device_node *node = pdev->dev.of_node;  in stm32_dfsdm_parse_of()
227 		return -EINVAL;  in stm32_dfsdm_parse_of()
229 	priv->dfsdm.base = devm_platform_get_and_ioremap_resource(pdev, 0,  in stm32_dfsdm_parse_of()
231 	if (IS_ERR(priv->dfsdm.base))  in stm32_dfsdm_parse_of()
232 		return PTR_ERR(priv->dfsdm.base);  in stm32_dfsdm_parse_of()
234 	priv->dfsdm.phys_base = res->start;  in stm32_dfsdm_parse_of()
239 	 * the SPI clock out signal and internal processing, depending  in stm32_dfsdm_parse_of()
242 	priv->clk = devm_clk_get(&pdev->dev, "dfsdm");  in stm32_dfsdm_parse_of()
243 	if (IS_ERR(priv->clk))  in stm32_dfsdm_parse_of()
244 		return dev_err_probe(&pdev->dev, PTR_ERR(priv->clk),  in stm32_dfsdm_parse_of()
247 	priv->aclk = devm_clk_get(&pdev->dev, "audio");  in stm32_dfsdm_parse_of()
248 	if (IS_ERR(priv->aclk))  in stm32_dfsdm_parse_of()
249 		priv->aclk = NULL;  in stm32_dfsdm_parse_of()
251 	if (priv->aclk)  in stm32_dfsdm_parse_of()
252 		clk_freq = clk_get_rate(priv->aclk);  in stm32_dfsdm_parse_of()
254 		clk_freq = clk_get_rate(priv->clk);  in stm32_dfsdm_parse_of()
256 	/* SPI clock out frequency */  in stm32_dfsdm_parse_of()
257 	ret = of_property_read_u32(pdev->dev.of_node, "spi-max-frequency",  in stm32_dfsdm_parse_of()
260 		/* No SPI master mode */  in stm32_dfsdm_parse_of()
271 		dev_err(&pdev->dev, "spi-max-frequency not achievable\n");  in stm32_dfsdm_parse_of()
272 		return -EINVAL;  in stm32_dfsdm_parse_of()
275 	/* SPI clock output divider is: divider = CKOUTDIV + 1 */  in stm32_dfsdm_parse_of()
276 	priv->spi_clk_out_div = divider - 1;  in stm32_dfsdm_parse_of()
277 	priv->dfsdm.spi_master_freq = clk_freq / (priv->spi_clk_out_div + 1);  in stm32_dfsdm_parse_of()
280 		dev_warn(&pdev->dev, "SPI clock not accurate\n");  in stm32_dfsdm_parse_of()
281 		dev_warn(&pdev->dev, "%ld = %d * %d + %d\n",  in stm32_dfsdm_parse_of()
282 			 clk_freq, spi_freq, priv->spi_clk_out_div + 1, rem);  in stm32_dfsdm_parse_of()
290 		.compatible = "st,stm32h7-dfsdm",
294 		.compatible = "st,stm32mp1-dfsdm",
308 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in stm32_dfsdm_probe()
310 		return -ENOMEM;  in stm32_dfsdm_probe()
312 	priv->pdev = pdev;  in stm32_dfsdm_probe()
314 	dev_data = of_device_get_match_data(&pdev->dev);  in stm32_dfsdm_probe()
316 	dfsdm = &priv->dfsdm;  in stm32_dfsdm_probe()
317 	dfsdm->fl_list = devm_kcalloc(&pdev->dev, dev_data->num_filters,  in stm32_dfsdm_probe()
318 				      sizeof(*dfsdm->fl_list), GFP_KERNEL);  in stm32_dfsdm_probe()
319 	if (!dfsdm->fl_list)  in stm32_dfsdm_probe()
320 		return -ENOMEM;  in stm32_dfsdm_probe()
322 	dfsdm->num_fls = dev_data->num_filters;  in stm32_dfsdm_probe()
323 	dfsdm->ch_list = devm_kcalloc(&pdev->dev, dev_data->num_channels,  in stm32_dfsdm_probe()
324 				      sizeof(*dfsdm->ch_list),  in stm32_dfsdm_probe()
326 	if (!dfsdm->ch_list)  in stm32_dfsdm_probe()
327 		return -ENOMEM;  in stm32_dfsdm_probe()
328 	dfsdm->num_chs = dev_data->num_channels;  in stm32_dfsdm_probe()
334 	dfsdm->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "dfsdm",  in stm32_dfsdm_probe()
335 						  dfsdm->base,  in stm32_dfsdm_probe()
336 						  dev_data->regmap_cfg);  in stm32_dfsdm_probe()
337 	if (IS_ERR(dfsdm->regmap)) {  in stm32_dfsdm_probe()
338 		ret = PTR_ERR(dfsdm->regmap);  in stm32_dfsdm_probe()
339 		dev_err(&pdev->dev, "%s: Failed to allocate regmap: %d\n",  in stm32_dfsdm_probe()
348 		dev_err(&pdev->dev, "Failed to start clock\n");  in stm32_dfsdm_probe()
352 	pm_runtime_get_noresume(&pdev->dev);  in stm32_dfsdm_probe()
353 	pm_runtime_set_active(&pdev->dev);  in stm32_dfsdm_probe()
354 	pm_runtime_enable(&pdev->dev);  in stm32_dfsdm_probe()
356 	ret = of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);  in stm32_dfsdm_probe()
360 	pm_runtime_put(&pdev->dev);  in stm32_dfsdm_probe()
365 	pm_runtime_disable(&pdev->dev);  in stm32_dfsdm_probe()
366 	pm_runtime_set_suspended(&pdev->dev);  in stm32_dfsdm_probe()
367 	pm_runtime_put_noidle(&pdev->dev);  in stm32_dfsdm_probe()
377 	pm_runtime_get_sync(&pdev->dev);  in stm32_dfsdm_core_remove()
378 	of_platform_depopulate(&pdev->dev);  in stm32_dfsdm_core_remove()
379 	pm_runtime_disable(&pdev->dev);  in stm32_dfsdm_core_remove()
380 	pm_runtime_set_suspended(&pdev->dev);  in stm32_dfsdm_core_remove()
381 	pm_runtime_put_noidle(&pdev->dev);  in stm32_dfsdm_core_remove()
398 	clk_unprepare(priv->clk);  in stm32_dfsdm_core_suspend()
413 	ret = clk_prepare(priv->clk);  in stm32_dfsdm_core_resume()
448 		.name = "stm32-dfsdm",