1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34  * Reference:  Intel Developer's manual v.3 #245472-012
129 	 * We attach a p4tcc child for every CPU since settings need to  in p4tcc_identify()
130 	 * be performed on every CPU in the SMP case.  See section 13.15.3  in p4tcc_identify()
131 	 * of the IA32 Intel Architecture Software Developer's Manual,  in p4tcc_identify()
132 	 * Volume 3, for more info.  in p4tcc_identify()
157 	sc->dev = dev;  in p4tcc_attach()
158 	sc->set_count = TCC_NUM_SETTINGS;  in p4tcc_attach()
166 	sc->auto_mode = TRUE;  in p4tcc_attach()
169 	 * XXX: After a cursory glance at various Intel specification  in p4tcc_attach()
186 		sc->set_count -= 1;  in p4tcc_attach()
199 		sc->set_count -= 2;  in p4tcc_attach()
202 	sc->lowest_val = TCC_NUM_SETTINGS - sc->set_count + 1;  in p4tcc_attach()
206 	 * set us to a lower rate.  The user can override this after boot.  in p4tcc_attach()
242 	if (*count < sc->set_count)  in p4tcc_settings()
245 	/* Return a list of valid settings for this driver. */  in p4tcc_settings()
246 	memset(sets, CPUFREQ_VAL_UNKNOWN, sizeof(*sets) * sc->set_count);  in p4tcc_settings()
248 	for (i = 0; i < sc->set_count; i++, val--) {  in p4tcc_settings()
252 	*count = sc->set_count;  in p4tcc_settings()
269 	 * Validate requested state converts to a setting that is an integer  in p4tcc_set()
270 	 * from [sc->lowest_val .. TCC_NUM_SETTINGS].  in p4tcc_set()
272 	val = set->freq * TCC_NUM_SETTINGS / 10000;  in p4tcc_set()
273 	if (val * 10000 != set->freq * TCC_NUM_SETTINGS ||  in p4tcc_set()
274 	    val < sc->lowest_val || val > TCC_NUM_SETTINGS)  in p4tcc_set()
279 	 * On-Demand bit.  If the new val is < 100%, set it and the On-Demand  in p4tcc_set()
283 	mask = (TCC_NUM_SETTINGS - 1) << TCC_REG_OFFSET;  in p4tcc_set()
290 	 * Record whether we're now in Automatic or On-Demand mode.  We have  in p4tcc_set()
297 		sc->auto_mode = FALSE;  in p4tcc_set()
299 		sc->auto_mode = TRUE;  in p4tcc_set()
323 	if (!sc->auto_mode) {  in p4tcc_get()
325 		val = (msr >> TCC_REG_OFFSET) & (TCC_NUM_SETTINGS - 1);  in p4tcc_get()
330 	set->freq = TCC_SPEED_PERCENT(val);  in p4tcc_get()
331 	set->dev = dev;  in p4tcc_get()