1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
28  * This driver is based upon information found by examining speedstep-0.5
143 		*sig = -1;  in int15_gsic_call()
144 		*smi_cmd = -1;  in int15_gsic_call()
145 		*command = -1;  in int15_gsic_call()
146 		*smi_data = -1;  in int15_gsic_call()
147 		*flags = -1;  in int15_gsic_call()
161 /* Perform actual SMI call to enable SpeedStep. */
169 		data->result = error;  in set_ownership_cb()
173 	/* Copy in the magic string and send it by writing to the SMI port. */  in set_ownership_cb()
174 	strlcpy(data->buf, smist_magic, PAGE_SIZE);  in set_ownership_cb()
176 	    "movl $-1, %%edi\n\t"  in set_ownership_cb()
178 	    : "=D" (data->result)  in set_ownership_cb()
179 	    : "a" (data->command),  in set_ownership_cb()
182 	      "d" (data->smi_cmd),  in set_ownership_cb()
197 	 * passed to the BIOS in a 32-bit register, we have to make sure it is  in set_ownership()
216 	cb_data.smi_cmd = sc->smi_cmd;  in set_ownership()
217 	cb_data.command = sc->command;  in set_ownership()
245 	DPRINT(sc->dev, "calling GSI\n");  in getset_state()
248 	     "movl $-1, %%edi\n\t"  in getset_state()
253 	   : "a" (sc->command),  in getset_state()
256 	     "d" (sc->smi_cmd)  in getset_state()
259 	DPRINT(sc->dev, "GSI returned: eax %.8x ebx %.8x edi %.8x\n",  in getset_state()
297 	/* Check for a supported PCI-ISA bridge */  in smist_identify()
298 	for (id = piix4_pci_devices; id->desc != NULL; ++id) {  in smist_identify()
299 		if ((piix4 = pci_find_device(id->vendor, id->device)) != NULL)  in smist_identify()
306 		printf("smist: found supported isa bridge %s\n", id->desc);  in smist_identify()
308 	if (device_find_child(parent, "smist", -1) != NULL)  in smist_identify()
333 	perf_dev = device_find_child(device_get_parent(dev), "acpi_perf", -1);  in smist_probe()
339 	ichss_dev = device_find_child(device_get_parent(dev), "ichss", -1);  in smist_probe()
349 	if (sig != -1) {  in smist_probe()
350 		sc->smi_cmd = smi_cmd;  in smist_probe()
351 		sc->smi_data = smi_data;  in smist_probe()
363 		sc->command = (sig & 0xffffff00) | (command & 0xff);  in smist_probe()
364 		sc->flags = flags;  in smist_probe()
367 		sc->smi_cmd = 0xb2;  in smist_probe()
368 		sc->smi_data = 0xb3;  in smist_probe()
369 		sc->command = 0x47534982;  in smist_probe()
370 		sc->flags = 0;  in smist_probe()
373 	device_set_desc(dev, "SpeedStep SMI");  in smist_probe()
375 	return (-1500);  in smist_probe()
384 	sc->dev = dev;  in smist_attach()
391 	sc->sets[0].freq = CPUFREQ_VAL_UNKNOWN;  in smist_attach()
392 	sc->sets[0].volts = CPUFREQ_VAL_UNKNOWN;  in smist_attach()
393 	sc->sets[0].power = CPUFREQ_VAL_UNKNOWN;  in smist_attach()
394 	sc->sets[0].lat = 1000;  in smist_attach()
395 	sc->sets[0].dev = dev;  in smist_attach()
396 	sc->sets[1] = sc->sets[0];  in smist_attach()
430 		if (sc->sets[i].freq == CPUFREQ_VAL_UNKNOWN) {  in smist_settings()
432 			smist_set(dev, &sc->sets[i]);  in smist_settings()
434 			smist_set(dev, &sc->sets[first]);  in smist_settings()
438 	bcopy(sc->sets, sets, sizeof(sc->sets));  in smist_settings()
450 	/* Look up appropriate bit value based on frequency. */  in smist_set()
452 	if (CPUFREQ_CMP(set->freq, sc->sets[0].freq))  in smist_set()
454 	else if (CPUFREQ_CMP(set->freq, sc->sets[1].freq))  in smist_set()
472 	} while (rv && --try);  in smist_set()
474 	    rv, 4 - try);  in smist_set()
493 	if (sc->sets[state].freq == CPUFREQ_VAL_UNKNOWN) {  in smist_get()
495 		sc->sets[state].freq = rate / 1000000;  in smist_get()
497 		    sc->sets[state].freq);  in smist_get()
499 	*set = sc->sets[state];  in smist_get()