1 // SPDX-License-Identifier: GPL-2.0-only
3  * TI CPUFreq/OPP hw-supported driver
5  * Copyright (C) 2016-2017 Texas Instruments, Inc.
6  *	 Dave Gerlach <d-gerlach@ti.com>
11 #include <linux/mfd/syscon.h>
49 				     unsigned long efuse);
61 	struct regmap *syscon;  member
67 				      unsigned long efuse)  in amx3_efuse_xlate()  argument
69 	if (!efuse)  in amx3_efuse_xlate()
70 		efuse = opp_data->soc_data->efuse_fallback;  in amx3_efuse_xlate()
72 	return ~efuse;  in amx3_efuse_xlate()
76 				      unsigned long efuse)  in dra7_efuse_xlate()  argument
81 	 * The efuse on dra7 and am57 parts contains a specific  in dra7_efuse_xlate()
85 	switch (efuse) {  in dra7_efuse_xlate()
102 				      unsigned long efuse)  in omap3_efuse_xlate()  argument
105 	return BIT(efuse);  in omap3_efuse_xlate()
144  *  some eFuse values e.g. CONTROL_FUSE_OPP1_VDD1
145  *    are stored in the SYSCON register range
154 	.efuse_offset = OMAP34xx_ProdID_SKUID - OMAP3_SYSCON_BASE,
157 	.rev_offset = OMAP3_CONTROL_IDCODE - OMAP3_SYSCON_BASE,
170  *  some eFuse values e.g. CONTROL_FUSE_OPP 1G_VDD1
171  *    are stored in the SYSCON register range.
181 	.efuse_offset = OMAP3_CONTROL_DEVICE_STATUS - OMAP3_SYSCON_BASE,
184 	.rev_offset = OMAP3_CONTROL_IDCODE - OMAP3_SYSCON_BASE,
190  * high speed grade eFuse and no abb ldo
195 	.efuse_offset = OMAP3_CONTROL_DEVICE_STATUS - OMAP3_SYSCON_BASE,
198 	.rev_offset = OMAP3_CONTROL_IDCODE - OMAP3_SYSCON_BASE,
204  * ti_cpufreq_get_efuse() - Parse and return efuse value present on SoC
206  * @efuse_value: Set to the value parsed from efuse
208  * Returns error code if efuse not read properly.
213 	struct device *dev = opp_data->cpu_dev;  in ti_cpufreq_get_efuse()
214 	u32 efuse;  in ti_cpufreq_get_efuse()  local
217 	ret = regmap_read(opp_data->syscon, opp_data->soc_data->efuse_offset,  in ti_cpufreq_get_efuse()
218 			  &efuse);  in ti_cpufreq_get_efuse()
219 	if (ret == -EIO) {  in ti_cpufreq_get_efuse()
220 		/* not a syscon register! */  in ti_cpufreq_get_efuse()
222 				opp_data->soc_data->efuse_offset, 4);  in ti_cpufreq_get_efuse()
225 			return -ENOMEM;  in ti_cpufreq_get_efuse()
226 		efuse = readl(regs);  in ti_cpufreq_get_efuse()
231 			"Failed to read the efuse value from syscon: %d\n",  in ti_cpufreq_get_efuse()
236 	efuse = (efuse & opp_data->soc_data->efuse_mask);  in ti_cpufreq_get_efuse()
237 	efuse >>= opp_data->soc_data->efuse_shift;  in ti_cpufreq_get_efuse()
239 	*efuse_value = opp_data->soc_data->efuse_xlate(opp_data, efuse);  in ti_cpufreq_get_efuse()
245  * ti_cpufreq_get_rev() - Parse and return rev value present on SoC
254 	struct device *dev = opp_data->cpu_dev;  in ti_cpufreq_get_rev()
258 	ret = regmap_read(opp_data->syscon, opp_data->soc_data->rev_offset,  in ti_cpufreq_get_rev()
260 	if (ret == -EIO) {  in ti_cpufreq_get_rev()
261 		/* not a syscon register! */  in ti_cpufreq_get_rev()
263 				opp_data->soc_data->rev_offset, 4);  in ti_cpufreq_get_rev()
266 			return -ENOMEM;  in ti_cpufreq_get_rev()
272 			"Failed to read the revision number from syscon: %d\n",  in ti_cpufreq_get_rev()
284 	struct device *dev = opp_data->cpu_dev;  in ti_cpufreq_setup_syscon_register()
285 	struct device_node *np = opp_data->opp_node;  in ti_cpufreq_setup_syscon_register()
287 	opp_data->syscon = syscon_regmap_lookup_by_phandle(np,  in ti_cpufreq_setup_syscon_register()
288 							"syscon");  in ti_cpufreq_setup_syscon_register()
289 	if (IS_ERR(opp_data->syscon)) {  in ti_cpufreq_setup_syscon_register()
291 			"\"syscon\" is missing, cannot use OPPv2 table.\n");  in ti_cpufreq_setup_syscon_register()
292 		return PTR_ERR(opp_data->syscon);  in ti_cpufreq_setup_syscon_register()
332 	match = dev_get_platdata(&pdev->dev);  in ti_cpufreq_probe()
334 		return -ENODEV;  in ti_cpufreq_probe()
336 	opp_data = devm_kzalloc(&pdev->dev, sizeof(*opp_data), GFP_KERNEL);  in ti_cpufreq_probe()
338 		return -ENOMEM;  in ti_cpufreq_probe()
340 	opp_data->soc_data = match->data;  in ti_cpufreq_probe()
342 	opp_data->cpu_dev = get_cpu_device(0);  in ti_cpufreq_probe()
343 	if (!opp_data->cpu_dev) {  in ti_cpufreq_probe()
345 		return -ENODEV;  in ti_cpufreq_probe()
348 	opp_data->opp_node = dev_pm_opp_of_get_opp_desc_node(opp_data->cpu_dev);  in ti_cpufreq_probe()
349 	if (!opp_data->opp_node) {  in ti_cpufreq_probe()
350 		dev_info(opp_data->cpu_dev,  in ti_cpufreq_probe()
351 			 "OPP-v2 not supported, cpufreq-dt will attempt to use legacy tables.\n");  in ti_cpufreq_probe()
362 	 *	0 - SoC Revision  in ti_cpufreq_probe()
363 	 *	1 - eFuse value  in ti_cpufreq_probe()
373 	ti_opp_table = dev_pm_opp_set_supported_hw(opp_data->cpu_dev,  in ti_cpufreq_probe()
376 		dev_err(opp_data->cpu_dev,  in ti_cpufreq_probe()
382 	opp_data->opp_table = ti_opp_table;  in ti_cpufreq_probe()
384 	if (opp_data->soc_data->multi_regulator) {  in ti_cpufreq_probe()
387 		if (opp_data->soc_data->reg_names)  in ti_cpufreq_probe()
388 			reg_names = opp_data->soc_data->reg_names;  in ti_cpufreq_probe()
389 		ti_opp_table = dev_pm_opp_set_regulators(opp_data->cpu_dev,  in ti_cpufreq_probe()
393 			dev_pm_opp_put_supported_hw(opp_data->opp_table);  in ti_cpufreq_probe()
399 	of_node_put(opp_data->opp_node);  in ti_cpufreq_probe()
401 	platform_device_register_simple("cpufreq-dt", -1, NULL, 0);  in ti_cpufreq_probe()
406 	of_node_put(opp_data->opp_node);  in ti_cpufreq_probe()
418 		platform_device_register_data(NULL, "ti-cpufreq", -1, match,  in ti_cpufreq_init()
428 		.name = "ti-cpufreq",
433 MODULE_DESCRIPTION("TI CPUFreq/OPP hw-supported driver");
434 MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");