1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) 2016-2017 Texas Instruments Incorporated - https://www.ti.com/
5  *	Dave Gerlach <d-gerlach@ti.com>
7  * TI OPP supply driver that provides override into the regulator control
8  * for generic opp core to handle devices with ABB regulator and/or
26  * struct ti_opp_supply_optimum_voltage_table - optimized voltage table
36  * struct ti_opp_supply_data - OMAP specific opp supply data
40  * @old_supplies: Placeholder for supplies information for old OPP.
41  * @new_supplies: Placeholder for supplies information for new OPP.
54  * struct ti_opp_supply_of_data - device tree match data
55  * @flags:	specific type of opp supply
57  * @efuse_voltage_uv: Are the efuse entries in micro-volts? if not, assume
58  *		milli-volts.
69  * _store_optimized_voltages() - store optimized voltages
70  * @dev:	ti opp supply device for which we need to store info
81 	void __iomem *base;  in _store_optimized_voltages()  local
94 		ret = -ENODEV;  in _store_optimized_voltages()
98 	base = ioremap(res->start, resource_size(res));  in _store_optimized_voltages()
99 	if (!base) {  in _store_optimized_voltages()
101 		ret = -ENOMEM;  in _store_optimized_voltages()
105 	/* Fetch efuse-settings. */  in _store_optimized_voltages()
106 	prop = of_find_property(dev->of_node, "ti,efuse-settings", NULL);  in _store_optimized_voltages()
108 		dev_err(dev, "No 'ti,efuse-settings' property found\n");  in _store_optimized_voltages()
109 		ret = -EINVAL;  in _store_optimized_voltages()
113 	proplen = prop->length / sizeof(int);  in _store_optimized_voltages()
114 	data->num_vdd_table = proplen / 2;  in _store_optimized_voltages()
115 	/* Verify for corrupted OPP entries in dt */  in _store_optimized_voltages()
116 	if (data->num_vdd_table * 2 * sizeof(int) != prop->length) {  in _store_optimized_voltages()
117 		dev_err(dev, "Invalid 'ti,efuse-settings'\n");  in _store_optimized_voltages()
118 		ret = -EINVAL;  in _store_optimized_voltages()
122 	ret = of_property_read_u32(dev->of_node, "ti,absolute-max-voltage-uv",  in _store_optimized_voltages()
123 				   &data->vdd_absolute_max_voltage_uv);  in _store_optimized_voltages()
125 		dev_err(dev, "ti,absolute-max-voltage-uv is missing\n");  in _store_optimized_voltages()
126 		ret = -EINVAL;  in _store_optimized_voltages()
130 	table = kcalloc(data->num_vdd_table, sizeof(*data->vdd_table),  in _store_optimized_voltages()
133 		ret = -ENOMEM;  in _store_optimized_voltages()
136 	data->vdd_table = table;  in _store_optimized_voltages()
138 	val = prop->value;  in _store_optimized_voltages()
139 	for (i = 0; i < data->num_vdd_table; i++, table++) {  in _store_optimized_voltages()
143 		table->reference_uv = be32_to_cpup(val++);  in _store_optimized_voltages()
146 		tmp = readl(base + efuse_offset);  in _store_optimized_voltages()
147 		tmp &= of_data->efuse_voltage_mask;  in _store_optimized_voltages()
148 		tmp >>= __ffs(of_data->efuse_voltage_mask);  in _store_optimized_voltages()
150 		table->optimized_uv = of_data->efuse_voltage_uv ? tmp :  in _store_optimized_voltages()
154 			i, efuse_offset, table->reference_uv,  in _store_optimized_voltages()
155 			table->optimized_uv);  in _store_optimized_voltages()
159 		 * Use reference voltage for those - just add debug message  in _store_optimized_voltages()
162 		if (!table->optimized_uv) {  in _store_optimized_voltages()
164 				i, efuse_offset, table->reference_uv);  in _store_optimized_voltages()
165 			table->optimized_uv = table->reference_uv;  in _store_optimized_voltages()
169 	iounmap(base);  in _store_optimized_voltages()
175  * _free_optimized_voltages() - free resources for optvoltages
182 	kfree(data->vdd_table);  in _free_optimized_voltages()
183 	data->vdd_table = NULL;  in _free_optimized_voltages()
184 	data->num_vdd_table = 0;  in _free_optimized_voltages()
188  * _get_optimal_vdd_voltage() - Finds optimal voltage for the supply
191  * @reference_uv:	reference voltage (OPP voltage) for which we need value
203 	if (!data->num_vdd_table)  in _get_optimal_vdd_voltage()
206 	table = data->vdd_table;  in _get_optimal_vdd_voltage()
208 		return -EINVAL;  in _get_optimal_vdd_voltage()
210 	/* Find a exact match - this list is usually very small */  in _get_optimal_vdd_voltage()
211 	for (i = 0; i < data->num_vdd_table; i++, table++)  in _get_optimal_vdd_voltage()
212 		if (table->reference_uv == reference_uv)  in _get_optimal_vdd_voltage()
213 			return table->optimized_uv;  in _get_optimal_vdd_voltage()
232 		vdd_uv = supply->u_volt;  in _opp_set_voltage()
237 	 * are ganged (example if we set the max for an opp as 1.12v, and  in _opp_set_voltage()
245 		uv_max = supply->u_volt_max;  in _opp_set_voltage()
248 	    vdd_uv < supply->u_volt_min ||  in _opp_set_voltage()
249 	    supply->u_volt_min > uv_max) {  in _opp_set_voltage()
252 			 supply->u_volt_min, vdd_uv, uv_max);  in _opp_set_voltage()
253 		return -EINVAL;  in _opp_set_voltage()
257 		vdd_uv, supply->u_volt_min,  in _opp_set_voltage()
261 					    supply->u_volt_min,  in _opp_set_voltage()
266 			reg_name, vdd_uv, supply->u_volt_min,  in _opp_set_voltage()
274 /* Do the opp supply transition */
292 	/* Fetch supplies and freq information from OPP core */  in ti_opp_config_regulators()
301 					  new_supply_vdd->u_volt);  in ti_opp_config_regulators()
303 	if (new_supply_vdd->u_volt_min < vdd_uv)  in ti_opp_config_regulators()
304 		new_supply_vdd->u_volt_min = vdd_uv;  in ti_opp_config_regulators()
335 	if (old_supply_vdd->u_volt) {  in ti_opp_config_regulators()
365 	{.compatible = "ti,omap-opp-supply", .data = &omap_generic_of_data},
366 	{.compatible = "ti,omap5-opp-supply", .data = &omap_omap5_of_data},
367 	{.compatible = "ti,omap5-core-opp-supply",
375 	struct device *dev = &pdev->dev;  in ti_opp_supply_probe()
384 		return -EINVAL;  in ti_opp_supply_probe()
389 	if (of_data->flags & OPPDM_EFUSE_CLASS0_OPTIMIZED_VOLTAGE) {  in ti_opp_supply_probe()
413 MODULE_DESCRIPTION("Texas Instruments OMAP OPP Supply driver");
415 MODULE_LICENSE("GPL v2");