1 // SPDX-License-Identifier: GPL-2.0
19  * mmc_ocrbitnum_to_vdd - Convert a OCR bit number to its voltage
32 		return -EINVAL;  in mmc_ocrbitnum_to_vdd()
40 	tmp = vdd_bit - ilog2(MMC_VDD_165_195);  in mmc_ocrbitnum_to_vdd()
53  * mmc_regulator_get_ocrmask - return mask of supported voltages
54  * @supply: regulator to use
61 static int mmc_regulator_get_ocrmask(struct regulator *supply)  in mmc_regulator_get_ocrmask()  argument
69 	count = regulator_count_voltages(supply);  in mmc_regulator_get_ocrmask()
74 		vdd_uV = regulator_list_voltage(supply, i);  in mmc_regulator_get_ocrmask()
83 		vdd_uV = regulator_get_voltage(supply);  in mmc_regulator_get_ocrmask()
95  * mmc_regulator_set_ocr - set regulator to match host->ios voltage
97  * @supply: regulator to use
98  * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
103  * a particular supply voltage.  This would normally be called from the
107 			struct regulator *supply,  in mmc_regulator_set_ocr()  argument
113 	if (IS_ERR(supply))  in mmc_regulator_set_ocr()
119 		result = regulator_set_voltage(supply, min_uV, max_uV);  in mmc_regulator_set_ocr()
120 		if (result == 0 && !mmc->regulator_enabled) {  in mmc_regulator_set_ocr()
121 			result = regulator_enable(supply);  in mmc_regulator_set_ocr()
123 				mmc->regulator_enabled = true;  in mmc_regulator_set_ocr()
125 	} else if (mmc->regulator_enabled) {  in mmc_regulator_set_ocr()
126 		result = regulator_disable(supply);  in mmc_regulator_set_ocr()
128 			mmc->regulator_enabled = false;  in mmc_regulator_set_ocr()
149 		return -EINVAL;  in mmc_regulator_set_voltage_if_supported()
164  * mmc_regulator_set_vqmmc - Set VQMMC as per the ios
168  * For 3.3V signaling, we try to match VQMMC to VMMC as closely as possible.
169  * That will match the behavior of old boards where VQMMC and VMMC were supplied
170  * by the same supply.  The Bus Operating conditions for 3.3V signaling in the
171  * SD card spec also define VQMMC in terms of VMMC.
172  * If this is not possible we'll try the full 2.7-3.6V of the spec.
187 	/* If no vqmmc supply then we can't change the voltage */  in mmc_regulator_set_vqmmc()
188 	if (IS_ERR(mmc->supply.vqmmc))  in mmc_regulator_set_vqmmc()
189 		return -EINVAL;  in mmc_regulator_set_vqmmc()
191 	switch (ios->signal_voltage) {  in mmc_regulator_set_vqmmc()
193 		return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,  in mmc_regulator_set_vqmmc()
196 		return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,  in mmc_regulator_set_vqmmc()
199 		ret = mmc_ocrbitnum_to_vdd(mmc->ios.vdd, &volt, &max_uV);  in mmc_regulator_set_vqmmc()
203 		dev_dbg(dev, "%s: found vmmc voltage range of %d-%duV\n",  in mmc_regulator_set_vqmmc()
206 		min_uV = max(volt - 300000, 2700000);  in mmc_regulator_set_vqmmc()
213 		 * voltage in two steps and try to stay close to vmmc  in mmc_regulator_set_vqmmc()
216 		ret = mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,  in mmc_regulator_set_vqmmc()
221 		return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,  in mmc_regulator_set_vqmmc()
224 		return -EINVAL;  in mmc_regulator_set_vqmmc()
231 static inline int mmc_regulator_get_ocrmask(struct regulator *supply)  in mmc_regulator_get_ocrmask()  argument
239  * mmc_regulator_get_supply - try to get VMMC and VQMMC regulators for a host
243  * or -EPROBE_DEFER. 0 means no critical error but it does not mean all
253 	mmc->supply.vmmc = devm_regulator_get_optional(dev, "vmmc");  in mmc_regulator_get_supply()
254 	mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc");  in mmc_regulator_get_supply()
256 	if (IS_ERR(mmc->supply.vmmc)) {  in mmc_regulator_get_supply()
257 		if (PTR_ERR(mmc->supply.vmmc) == -EPROBE_DEFER)  in mmc_regulator_get_supply()
258 			return dev_err_probe(dev, -EPROBE_DEFER,  in mmc_regulator_get_supply()
259 					     "vmmc regulator not available\n");  in mmc_regulator_get_supply()
261 		dev_dbg(dev, "No vmmc regulator found\n");  in mmc_regulator_get_supply()
263 		ret = mmc_regulator_get_ocrmask(mmc->supply.vmmc);  in mmc_regulator_get_supply()
265 			mmc->ocr_avail = ret;  in mmc_regulator_get_supply()
270 	if (IS_ERR(mmc->supply.vqmmc)) {  in mmc_regulator_get_supply()
271 		if (PTR_ERR(mmc->supply.vqmmc) == -EPROBE_DEFER)  in mmc_regulator_get_supply()
272 			return dev_err_probe(dev, -EPROBE_DEFER,  in mmc_regulator_get_supply()
283  * mmc_regulator_enable_vqmmc - enable VQMMC regulator for a host
294 	if (!IS_ERR(mmc->supply.vqmmc) && !mmc->vqmmc_enabled) {  in mmc_regulator_enable_vqmmc()
295 		ret = regulator_enable(mmc->supply.vqmmc);  in mmc_regulator_enable_vqmmc()
299 			mmc->vqmmc_enabled = true;  in mmc_regulator_enable_vqmmc()
307  * mmc_regulator_disable_vqmmc - disable VQMMC regulator for a host
316 	if (!IS_ERR(mmc->supply.vqmmc) && mmc->vqmmc_enabled) {  in mmc_regulator_disable_vqmmc()
317 		regulator_disable(mmc->supply.vqmmc);  in mmc_regulator_disable_vqmmc()
318 		mmc->vqmmc_enabled = false;  in mmc_regulator_disable_vqmmc()