3  * (C) 2002 - 2003  Dominik Brodowski <linux@brodo.de>
7  *  for chipsets ICH2-M and ICH3-M.
9  *  Many thanks to Ducrot Bruno for finding and fixing the last
10  *  "missing link" for ICH2-M/ICH3-M support, and to Thomas Winkler
18  *                        SPEEDSTEP - DEFINITIONS                    *
28 #include "speedstep-lib.h"
32  *   It is necessary to know which chipset is used. As accesses to
34  * static struct pci_dev * pointing to that device.
57  * speedstep_find_register - read the PMBASE address
59  * Returns: -ENODEV if no register could be found
64 		return -ENODEV;  in speedstep_find_register()
69 		printk(KERN_ERR "speedstep-ich: could not find speedstep register\n");  in speedstep_find_register()
70 		return -ENODEV;  in speedstep_find_register()
75 		printk(KERN_ERR "speedstep-ich: could not find speedstep register\n");  in speedstep_find_register()
76 		return -ENODEV;  in speedstep_find_register()
84  * speedstep_set_state - set the SpeedStep state
87  *   Tries to change the SpeedStep state.  Can be called from
111 	pr_debug("writing 0x%x to pmbase 0x%x + 0x50\n", value, pmbase);  in speedstep_set_state()
134 		pr_debug("change to %u MHz succeeded\n",  in speedstep_set_state()
137 		printk(KERN_ERR "cpufreq: change failed - I/O error\n");  in speedstep_set_state()
149  * speedstep_activate - activate SpeedStep control in the chipset
151  *   Tries to activate the SpeedStep status and control registers.
152  * Returns -EINVAL on an unsupported chipset, and zero on success.
159 		return -EINVAL;  in speedstep_activate()
173  * speedstep_detect_chipset - detect the Southbridge which contains SpeedStep logic
175  *   Detects ICH2-M, ICH3-M and ICH4-M so far. The pci_dev points to
176  * the LPC bridge / PM module which contains all power-management
177  * functions. Returns the SPEEDSTEP_CHIPSET_-number for the detected
187 		return 4; /* 4-M */  in speedstep_detect_chipset()
194 		return 3; /* 3-M */  in speedstep_detect_chipset()
214 			return 2; /* 2-M */  in speedstep_detect_chipset()
216 		if (hostbridge->revision < 5) {  in speedstep_detect_chipset()
224 		return 2; /* 2-M */  in speedstep_detect_chipset()
241 	/* You're supposed to ensure CPU is online. */  in speedstep_get()
250  * speedstep_target - set a new CPUFreq policy
253  * @relation: how that frequency relates to achieved frequency
268 		return -EINVAL;  in speedstep_target()
270 	policy_cpu = cpumask_any_and(policy->cpus, cpu_online_mask);  in speedstep_target()
273 	freqs.cpu = policy->cpu;  in speedstep_target()
275 	pr_debug("transiting from %u to %u kHz\n", freqs.old, freqs.new);  in speedstep_target()
281 	for_each_cpu(i, policy->cpus) {  in speedstep_target()
289 	for_each_cpu(i, policy->cpus) {  in speedstep_target()
299  * speedstep_verify - verifies a new CPUFreq policy
319 	get_freqs->ret =  in get_freqs_on_cpu()
323 			    &get_freqs->policy->cpuinfo.transition_latency,  in get_freqs_on_cpu()
333 	/* only run on CPU to be set, or on its sibling */  in speedstep_cpu_init()
335 	cpumask_copy(policy->cpus, cpu_sibling_mask(policy->cpu));  in speedstep_cpu_init()
337 	policy_cpu = cpumask_any_and(policy->cpus, cpu_online_mask);  in speedstep_cpu_init()
348 		return -EIO;  in speedstep_cpu_init()
350 	pr_debug("currently at %s speed setting - %i MHz\n",  in speedstep_cpu_init()
356 	policy->cur = speed;  in speedstep_cpu_init()
362 	cpufreq_frequency_table_get_attr(speedstep_freqs, policy->cpu);  in speedstep_cpu_init()
370 	cpufreq_frequency_table_put_attr(policy->cpu);  in speedstep_cpu_exit()
381 	.name	= "speedstep-ich",
393  * speedstep_init - initializes the SpeedStep CPUFreq driver
395  *   Initializes the SpeedStep support. Returns -ENODEV on unsupported
396  * devices, -EINVAL on problems during initiatization, and zero on
406 		return -ENODEV;  in speedstep_init()
413 		return -ENODEV;  in speedstep_init()
416 	/* activate speedstep support */  in speedstep_init()
419 		return -EINVAL;  in speedstep_init()
423 		return -ENODEV;  in speedstep_init()
430  * speedstep_exit - unregisters SpeedStep support
444 		"with ICH-M southbridges.");