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>
57 				     unsigned long efuse);
64 /* Backward compatibility hack: Might have missing syscon */
72 	struct regmap *syscon;  member
77 				      unsigned long efuse)  in amx3_efuse_xlate()  argument
79 	if (!efuse)  in amx3_efuse_xlate()
80 		efuse = opp_data->soc_data->efuse_fallback;  in amx3_efuse_xlate()
82 	return ~efuse;  in amx3_efuse_xlate()
86 				      unsigned long efuse)  in dra7_efuse_xlate()  argument
91 	 * The efuse on dra7 and am57 parts contains a specific  in dra7_efuse_xlate()
95 	switch (efuse) {  in dra7_efuse_xlate()
112 				      unsigned long efuse)  in omap3_efuse_xlate()  argument
115 	return BIT(efuse);  in omap3_efuse_xlate()
119 				       unsigned long efuse)  in am625_efuse_xlate()  argument
123 	switch (efuse) {  in am625_efuse_xlate()
173  *  some eFuse values e.g. CONTROL_FUSE_OPP1_VDD1
174  *    are stored in the SYSCON register range
183 	.efuse_offset = OMAP34xx_ProdID_SKUID - OMAP3_SYSCON_BASE,
186 	.rev_offset = OMAP3_CONTROL_IDCODE - OMAP3_SYSCON_BASE,
200  *  some eFuse values e.g. CONTROL_FUSE_OPP 1G_VDD1
201  *    are stored in the SYSCON register range.
211 	.efuse_offset = OMAP3_CONTROL_DEVICE_STATUS - OMAP3_SYSCON_BASE,
214 	.rev_offset = OMAP3_CONTROL_IDCODE - OMAP3_SYSCON_BASE,
221  * high speed grade eFuse and no abb ldo
226 	.efuse_offset = OMAP3_CONTROL_DEVICE_STATUS - OMAP3_SYSCON_BASE,
229 	.rev_offset = OMAP3_CONTROL_IDCODE - OMAP3_SYSCON_BASE,
244  * ti_cpufreq_get_efuse() - Parse and return efuse value present on SoC
246  * @efuse_value: Set to the value parsed from efuse
248  * Returns error code if efuse not read properly.
253 	struct device *dev = opp_data->cpu_dev;  in ti_cpufreq_get_efuse()
254 	u32 efuse;  in ti_cpufreq_get_efuse()  local
257 	ret = regmap_read(opp_data->syscon, opp_data->soc_data->efuse_offset,  in ti_cpufreq_get_efuse()
258 			  &efuse);  in ti_cpufreq_get_efuse()
259 	if (opp_data->soc_data->quirks & TI_QUIRK_SYSCON_MAY_BE_MISSING && ret == -EIO) {  in ti_cpufreq_get_efuse()
260 		/* not a syscon register! */  in ti_cpufreq_get_efuse()
262 				opp_data->soc_data->efuse_offset, 4);  in ti_cpufreq_get_efuse()
265 			return -ENOMEM;  in ti_cpufreq_get_efuse()
266 		efuse = readl(regs);  in ti_cpufreq_get_efuse()
271 			"Failed to read the efuse value from syscon: %d\n",  in ti_cpufreq_get_efuse()
276 	efuse = (efuse & opp_data->soc_data->efuse_mask);  in ti_cpufreq_get_efuse()
277 	efuse >>= opp_data->soc_data->efuse_shift;  in ti_cpufreq_get_efuse()
279 	*efuse_value = opp_data->soc_data->efuse_xlate(opp_data, efuse);  in ti_cpufreq_get_efuse()
285  * ti_cpufreq_get_rev() - Parse and return rev value present on SoC
294 	struct device *dev = opp_data->cpu_dev;  in ti_cpufreq_get_rev()
298 	ret = regmap_read(opp_data->syscon, opp_data->soc_data->rev_offset,  in ti_cpufreq_get_rev()
300 	if (opp_data->soc_data->quirks & TI_QUIRK_SYSCON_MAY_BE_MISSING && ret == -EIO) {  in ti_cpufreq_get_rev()
301 		/* not a syscon register! */  in ti_cpufreq_get_rev()
303 				opp_data->soc_data->rev_offset, 4);  in ti_cpufreq_get_rev()
306 			return -ENOMEM;  in ti_cpufreq_get_rev()
312 			"Failed to read the revision number from syscon: %d\n",  in ti_cpufreq_get_rev()
324 	struct device *dev = opp_data->cpu_dev;  in ti_cpufreq_setup_syscon_register()
325 	struct device_node *np = opp_data->opp_node;  in ti_cpufreq_setup_syscon_register()
327 	opp_data->syscon = syscon_regmap_lookup_by_phandle(np,  in ti_cpufreq_setup_syscon_register()
328 							"syscon");  in ti_cpufreq_setup_syscon_register()
329 	if (IS_ERR(opp_data->syscon)) {  in ti_cpufreq_setup_syscon_register()
331 			"\"syscon\" is missing, cannot use OPPv2 table.\n");  in ti_cpufreq_setup_syscon_register()
332 		return PTR_ERR(opp_data->syscon);  in ti_cpufreq_setup_syscon_register()
377 	match = dev_get_platdata(&pdev->dev);  in ti_cpufreq_probe()
379 		return -ENODEV;  in ti_cpufreq_probe()
381 	opp_data = devm_kzalloc(&pdev->dev, sizeof(*opp_data), GFP_KERNEL);  in ti_cpufreq_probe()
383 		return -ENOMEM;  in ti_cpufreq_probe()
385 	opp_data->soc_data = match->data;  in ti_cpufreq_probe()
387 	opp_data->cpu_dev = get_cpu_device(0);  in ti_cpufreq_probe()
388 	if (!opp_data->cpu_dev) {  in ti_cpufreq_probe()
390 		return -ENODEV;  in ti_cpufreq_probe()
393 	opp_data->opp_node = dev_pm_opp_of_get_opp_desc_node(opp_data->cpu_dev);  in ti_cpufreq_probe()
394 	if (!opp_data->opp_node) {  in ti_cpufreq_probe()
395 		dev_info(opp_data->cpu_dev,  in ti_cpufreq_probe()
396 			 "OPP-v2 not supported, cpufreq-dt will attempt to use legacy tables.\n");  in ti_cpufreq_probe()
407 	 *	0 - SoC Revision  in ti_cpufreq_probe()
408 	 *	1 - eFuse value  in ti_cpufreq_probe()
418 	if (opp_data->soc_data->multi_regulator) {  in ti_cpufreq_probe()
419 		if (opp_data->soc_data->reg_names)  in ti_cpufreq_probe()
420 			config.regulator_names = opp_data->soc_data->reg_names;  in ti_cpufreq_probe()
425 	ret = dev_pm_opp_set_config(opp_data->cpu_dev, &config);  in ti_cpufreq_probe()
427 		dev_err_probe(opp_data->cpu_dev, ret, "Failed to set OPP config\n");  in ti_cpufreq_probe()
431 	of_node_put(opp_data->opp_node);  in ti_cpufreq_probe()
434 	platform_device_register_simple("cpufreq-dt", -1, NULL, 0);  in ti_cpufreq_probe()
439 	of_node_put(opp_data->opp_node);  in ti_cpufreq_probe()
451 		platform_device_register_data(NULL, "ti-cpufreq", -1, match,  in ti_cpufreq_init()
461 		.name = "ti-cpufreq",
466 MODULE_DESCRIPTION("TI CPUFreq/OPP hw-supported driver");
467 MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");