3  * This file is part the core part STM32 DFSDM driver
23 #include "stm32-dfsdm.h"
26  * struct stm32_dfsdm_dev_data - DFSDM compatible configuration data
27  * @ipid: DFSDM identification number. Used only if hardware provides identification registers
28  * @num_filters: DFSDM number of filters. Unused if identification registers are available
29  * @num_channels: DFSDM number of channels. Unused if identification registers are available
94 	struct stm32_dfsdm dfsdm; /* common data exported for all instances */  member
99 	struct clk *clk; /* DFSDM clock */
103 static inline struct dfsdm_priv *to_stm32_dfsdm_priv(struct stm32_dfsdm *dfsdm)  in to_stm32_dfsdm_priv()  argument
105 	return container_of(dfsdm, struct dfsdm_priv, dfsdm);  in to_stm32_dfsdm_priv()
108 static int stm32_dfsdm_clk_prepare_enable(struct stm32_dfsdm *dfsdm)  in stm32_dfsdm_clk_prepare_enable()  argument
110 	struct dfsdm_priv *priv = to_stm32_dfsdm_priv(dfsdm);  in stm32_dfsdm_clk_prepare_enable()
124 static void stm32_dfsdm_clk_disable_unprepare(struct stm32_dfsdm *dfsdm)  in stm32_dfsdm_clk_disable_unprepare()  argument
126 	struct dfsdm_priv *priv = to_stm32_dfsdm_priv(dfsdm);  in stm32_dfsdm_clk_disable_unprepare()
133  * stm32_dfsdm_start_dfsdm - start global dfsdm interface.
136  * @dfsdm: Handle used to retrieve dfsdm context.
138 int stm32_dfsdm_start_dfsdm(struct stm32_dfsdm *dfsdm)  in stm32_dfsdm_start_dfsdm()  argument
140 	struct dfsdm_priv *priv = to_stm32_dfsdm_priv(dfsdm);  in stm32_dfsdm_start_dfsdm()
150 		/* select clock source, e.g. 0 for "dfsdm" or 1 for "audio" */  in stm32_dfsdm_start_dfsdm()
152 		ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0),  in stm32_dfsdm_start_dfsdm()
159 		ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0),  in stm32_dfsdm_start_dfsdm()
165 		/* Global enable of DFSDM interface */  in stm32_dfsdm_start_dfsdm()
166 		ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0),  in stm32_dfsdm_start_dfsdm()
188  * stm32_dfsdm_stop_dfsdm - stop global DFSDM interface.
191  * @dfsdm: Handle used to retrieve dfsdm context.
193 int stm32_dfsdm_stop_dfsdm(struct stm32_dfsdm *dfsdm)  in stm32_dfsdm_stop_dfsdm()  argument
195 	struct dfsdm_priv *priv = to_stm32_dfsdm_priv(dfsdm);  in stm32_dfsdm_stop_dfsdm()
199 		/* Global disable of DFSDM interface */  in stm32_dfsdm_stop_dfsdm()
200 		ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0),  in stm32_dfsdm_stop_dfsdm()
207 		ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0),  in stm32_dfsdm_stop_dfsdm()
234 	priv->dfsdm.base = devm_platform_get_and_ioremap_resource(pdev, 0,  in stm32_dfsdm_parse_of()
236 	if (IS_ERR(priv->dfsdm.base))  in stm32_dfsdm_parse_of()
237 		return PTR_ERR(priv->dfsdm.base);  in stm32_dfsdm_parse_of()
239 	priv->dfsdm.phys_base = res->start;  in stm32_dfsdm_parse_of()
242 	 * "dfsdm" clock is mandatory for DFSDM peripheral clocking.  in stm32_dfsdm_parse_of()
243 	 * "dfsdm" or "audio" clocks can be used as source clock for  in stm32_dfsdm_parse_of()
247 	priv->clk = devm_clk_get(&pdev->dev, "dfsdm");  in stm32_dfsdm_parse_of()
282 	priv->dfsdm.spi_master_freq = clk_freq / (priv->spi_clk_out_div + 1);  in stm32_dfsdm_parse_of()
295 		.compatible = "st,stm32h7-dfsdm",
299 		.compatible = "st,stm32mp1-dfsdm",
312 	struct stm32_dfsdm *dfsdm = &priv->dfsdm;  in stm32_dfsdm_probe_identification()  local
318 		dfsdm->num_fls = dev_data->num_filters;  in stm32_dfsdm_probe_identification()
319 		dfsdm->num_chs = dev_data->num_channels;  in stm32_dfsdm_probe_identification()
323 	ret = regmap_read(dfsdm->regmap, DFSDM_IPIDR, &id);  in stm32_dfsdm_probe_identification()
336 		/* Count only child nodes with dfsdm compatible */  in stm32_dfsdm_probe_identification()
337 		if (strstr(compat, "dfsdm"))  in stm32_dfsdm_probe_identification()
341 	ret = regmap_read(dfsdm->regmap, DFSDM_HWCFGR, &val);  in stm32_dfsdm_probe_identification()
345 	dfsdm->num_fls = FIELD_GET(DFSDM_HWCFGR_NBF_MASK, val);  in stm32_dfsdm_probe_identification()
346 	dfsdm->num_chs = FIELD_GET(DFSDM_HWCFGR_NBT_MASK, val);  in stm32_dfsdm_probe_identification()
348 	if (count > dfsdm->num_fls) {  in stm32_dfsdm_probe_identification()
353 	ret = regmap_read(dfsdm->regmap, DFSDM_VERR, &val);  in stm32_dfsdm_probe_identification()
357 	dev_dbg(&pdev->dev, "DFSDM version: %lu.%lu. %d channels/%d filters\n",  in stm32_dfsdm_probe_identification()
360 		dfsdm->num_chs, dfsdm->num_fls);  in stm32_dfsdm_probe_identification()
369 	struct stm32_dfsdm *dfsdm;  in stm32_dfsdm_probe()  local
380 	dfsdm = &priv->dfsdm;  in stm32_dfsdm_probe()
386 	dfsdm->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "dfsdm",  in stm32_dfsdm_probe()
387 						  dfsdm->base,  in stm32_dfsdm_probe()
389 	if (IS_ERR(dfsdm->regmap)) {  in stm32_dfsdm_probe()
390 		ret = PTR_ERR(dfsdm->regmap);  in stm32_dfsdm_probe()
400 	dfsdm->fl_list = devm_kcalloc(&pdev->dev, dfsdm->num_fls,  in stm32_dfsdm_probe()
401 				      sizeof(*dfsdm->fl_list), GFP_KERNEL);  in stm32_dfsdm_probe()
402 	if (!dfsdm->fl_list)  in stm32_dfsdm_probe()
405 	dfsdm->ch_list = devm_kcalloc(&pdev->dev, dfsdm->num_chs,  in stm32_dfsdm_probe()
406 				      sizeof(*dfsdm->ch_list), GFP_KERNEL);  in stm32_dfsdm_probe()
407 	if (!dfsdm->ch_list)  in stm32_dfsdm_probe()
410 	platform_set_drvdata(pdev, dfsdm);  in stm32_dfsdm_probe()
412 	ret = stm32_dfsdm_clk_prepare_enable(dfsdm);  in stm32_dfsdm_probe()
434 	stm32_dfsdm_clk_disable_unprepare(dfsdm);  in stm32_dfsdm_probe()
441 	struct stm32_dfsdm *dfsdm = platform_get_drvdata(pdev);  in stm32_dfsdm_core_remove()  local
448 	stm32_dfsdm_clk_disable_unprepare(dfsdm);  in stm32_dfsdm_core_remove()
453 	struct stm32_dfsdm *dfsdm = dev_get_drvdata(dev);  in stm32_dfsdm_core_suspend()  local
454 	struct dfsdm_priv *priv = to_stm32_dfsdm_priv(dfsdm);  in stm32_dfsdm_core_suspend()
469 	struct stm32_dfsdm *dfsdm = dev_get_drvdata(dev);  in stm32_dfsdm_core_resume()  local
470 	struct dfsdm_priv *priv = to_stm32_dfsdm_priv(dfsdm);  in stm32_dfsdm_core_resume()
486 	struct stm32_dfsdm *dfsdm = dev_get_drvdata(dev);  in stm32_dfsdm_core_runtime_suspend()  local
488 	stm32_dfsdm_clk_disable_unprepare(dfsdm);  in stm32_dfsdm_core_runtime_suspend()
495 	struct stm32_dfsdm *dfsdm = dev_get_drvdata(dev);  in stm32_dfsdm_core_runtime_resume()  local
497 	return stm32_dfsdm_clk_prepare_enable(dfsdm);  in stm32_dfsdm_core_runtime_resume()
511 		.name = "stm32-dfsdm",
520 MODULE_DESCRIPTION("STMicroelectronics STM32 dfsdm driver");