drivers/cpufreq/ti-cpufreq.c

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>
60 	 * The V, U, and T speed grade numbering is out of order
110 		efuse = opp_data->soc_data->efuse_fallback;  in amx3_efuse_xlate()
144 	/* OPP enable bit ("Speed Binned") */  in omap3_efuse_xlate()
256 	.efuse_offset = OMAP34xx_ProdID_SKUID - OMAP3_SYSCON_BASE,
259 	.rev_offset = OMAP3_CONTROL_IDCODE - OMAP3_SYSCON_BASE,
270  *   Speed Binned = Bit 9
284 	.efuse_offset = OMAP3_CONTROL_DEVICE_STATUS - OMAP3_SYSCON_BASE,
287 	.rev_offset = OMAP3_CONTROL_IDCODE - OMAP3_SYSCON_BASE,
294  * high speed grade eFuse and no abb ldo
299 	.efuse_offset = OMAP3_CONTROL_DEVICE_STATUS - OMAP3_SYSCON_BASE,
302 	.rev_offset = OMAP3_CONTROL_IDCODE - OMAP3_SYSCON_BASE,
342  * ti_cpufreq_get_efuse() - Parse and return efuse value present on SoC
351 	struct device *dev = opp_data->cpu_dev;  in ti_cpufreq_get_efuse()
355 	ret = regmap_read(opp_data->syscon, opp_data->soc_data->efuse_offset,  in ti_cpufreq_get_efuse()
357 	if (opp_data->soc_data->quirks & TI_QUIRK_SYSCON_MAY_BE_MISSING && ret == -EIO) {  in ti_cpufreq_get_efuse()
360 				opp_data->soc_data->efuse_offset, 4);  in ti_cpufreq_get_efuse()
363 			return -ENOMEM;  in ti_cpufreq_get_efuse()
374 	efuse = (efuse & opp_data->soc_data->efuse_mask);  in ti_cpufreq_get_efuse()
375 	efuse >>= opp_data->soc_data->efuse_shift;  in ti_cpufreq_get_efuse()
377 	*efuse_value = opp_data->soc_data->efuse_xlate(opp_data, efuse);  in ti_cpufreq_get_efuse()
383  * ti_cpufreq_get_rev() - Parse and return rev value present on SoC
392 	struct device *dev = opp_data->cpu_dev;  in ti_cpufreq_get_rev()
406 	ret = regmap_read(opp_data->syscon, opp_data->soc_data->rev_offset,  in ti_cpufreq_get_rev()
408 	if (opp_data->soc_data->quirks & TI_QUIRK_SYSCON_MAY_BE_MISSING && ret == -EIO) {  in ti_cpufreq_get_rev()
411 				opp_data->soc_data->rev_offset, 4);  in ti_cpufreq_get_rev()
414 			return -ENOMEM;  in ti_cpufreq_get_rev()
433 	struct device *dev = opp_data->cpu_dev;  in ti_cpufreq_setup_syscon_register()
434 	struct device_node *np = opp_data->opp_node;  in ti_cpufreq_setup_syscon_register()
436 	opp_data->syscon = syscon_regmap_lookup_by_phandle(np,  in ti_cpufreq_setup_syscon_register()
438 	if (IS_ERR(opp_data->syscon)) {  in ti_cpufreq_setup_syscon_register()
441 		return PTR_ERR(opp_data->syscon);  in ti_cpufreq_setup_syscon_register()
485 	match = dev_get_platdata(&pdev->dev);  in ti_cpufreq_probe()
487 		return -ENODEV;  in ti_cpufreq_probe()
489 	opp_data = devm_kzalloc(&pdev->dev, sizeof(*opp_data), GFP_KERNEL);  in ti_cpufreq_probe()
491 		return -ENOMEM;  in ti_cpufreq_probe()
493 	opp_data->soc_data = match->data;  in ti_cpufreq_probe()
495 	opp_data->cpu_dev = get_cpu_device(0);  in ti_cpufreq_probe()
496 	if (!opp_data->cpu_dev) {  in ti_cpufreq_probe()
498 		return -ENODEV;  in ti_cpufreq_probe()
501 	opp_data->opp_node = dev_pm_opp_of_get_opp_desc_node(opp_data->cpu_dev);  in ti_cpufreq_probe()
502 	if (!opp_data->opp_node) {  in ti_cpufreq_probe()
503 		dev_info(opp_data->cpu_dev,  in ti_cpufreq_probe()
504 			 "OPP-v2 not supported, cpufreq-dt will attempt to use legacy tables.\n");  in ti_cpufreq_probe()
515 	 *	0 - SoC Revision  in ti_cpufreq_probe()
516 	 *	1 - eFuse value  in ti_cpufreq_probe()
526 	if (opp_data->soc_data->multi_regulator) {  in ti_cpufreq_probe()
527 		if (opp_data->soc_data->reg_names)  in ti_cpufreq_probe()
528 			config.regulator_names = opp_data->soc_data->reg_names;  in ti_cpufreq_probe()
533 	ret = dev_pm_opp_set_config(opp_data->cpu_dev, &config);  in ti_cpufreq_probe()
535 		dev_err_probe(opp_data->cpu_dev, ret, "Failed to set OPP config\n");  in ti_cpufreq_probe()
539 	of_node_put(opp_data->opp_node);  in ti_cpufreq_probe()
542 	platform_device_register_simple("cpufreq-dt", -1, NULL, 0);  in ti_cpufreq_probe()
547 	of_node_put(opp_data->opp_node);  in ti_cpufreq_probe()
559 		platform_device_register_data(NULL, "ti-cpufreq", -1, match,  in ti_cpufreq_init()
569 		.name = "ti-cpufreq",
574 MODULE_DESCRIPTION("TI CPUFreq/OPP hw-supported driver");
575 MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");