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path: root/drivers/cpufreq/e_powersaver.c
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Diffstat (limited to 'drivers/cpufreq/e_powersaver.c')
-rw-r--r--drivers/cpufreq/e_powersaver.c135
1 files changed, 124 insertions, 11 deletions
diff --git a/drivers/cpufreq/e_powersaver.c b/drivers/cpufreq/e_powersaver.c
index 35a257dd4bb7..4bd6815d317b 100644
--- a/drivers/cpufreq/e_powersaver.c
+++ b/drivers/cpufreq/e_powersaver.c
@@ -19,6 +19,11 @@
#include <asm/msr.h>
#include <asm/tsc.h>
+#if defined CONFIG_ACPI_PROCESSOR || defined CONFIG_ACPI_PROCESSOR_MODULE
+#include <linux/acpi.h>
+#include <acpi/processor.h>
+#endif
+
#define EPS_BRAND_C7M 0
#define EPS_BRAND_C7 1
#define EPS_BRAND_EDEN 2
@@ -27,11 +32,59 @@
struct eps_cpu_data {
u32 fsb;
+#if defined CONFIG_ACPI_PROCESSOR || defined CONFIG_ACPI_PROCESSOR_MODULE
+ u32 bios_limit;
+#endif
struct cpufreq_frequency_table freq_table[];
};
static struct eps_cpu_data *eps_cpu[NR_CPUS];
+/* Module parameters */
+static int freq_failsafe_off;
+static int voltage_failsafe_off;
+static int set_max_voltage;
+
+#if defined CONFIG_ACPI_PROCESSOR || defined CONFIG_ACPI_PROCESSOR_MODULE
+static int ignore_acpi_limit;
+
+static struct acpi_processor_performance *eps_acpi_cpu_perf;
+
+/* Minimum necessary to get acpi_processor_get_bios_limit() working */
+static int eps_acpi_init(void)
+{
+ eps_acpi_cpu_perf = kzalloc(sizeof(struct acpi_processor_performance),
+ GFP_KERNEL);
+ if (!eps_acpi_cpu_perf)
+ return -ENOMEM;
+
+ if (!zalloc_cpumask_var(&eps_acpi_cpu_perf->shared_cpu_map,
+ GFP_KERNEL)) {
+ kfree(eps_acpi_cpu_perf);
+ eps_acpi_cpu_perf = NULL;
+ return -ENOMEM;
+ }
+
+ if (acpi_processor_register_performance(eps_acpi_cpu_perf, 0)) {
+ free_cpumask_var(eps_acpi_cpu_perf->shared_cpu_map);
+ kfree(eps_acpi_cpu_perf);
+ eps_acpi_cpu_perf = NULL;
+ return -EIO;
+ }
+ return 0;
+}
+
+static int eps_acpi_exit(struct cpufreq_policy *policy)
+{
+ if (eps_acpi_cpu_perf) {
+ acpi_processor_unregister_performance(eps_acpi_cpu_perf, 0);
+ free_cpumask_var(eps_acpi_cpu_perf->shared_cpu_map);
+ kfree(eps_acpi_cpu_perf);
+ eps_acpi_cpu_perf = NULL;
+ }
+ return 0;
+}
+#endif
static unsigned int eps_get(unsigned int cpu)
{
@@ -164,6 +217,9 @@ static int eps_cpu_init(struct cpufreq_policy *policy)
int k, step, voltage;
int ret;
int states;
+#if defined CONFIG_ACPI_PROCESSOR || defined CONFIG_ACPI_PROCESSOR_MODULE
+ unsigned int limit;
+#endif
if (policy->cpu != 0)
return -ENODEV;
@@ -244,11 +300,62 @@ static int eps_cpu_init(struct cpufreq_policy *policy)
return -EINVAL;
if (current_voltage > 0x1f || max_voltage > 0x1f)
return -EINVAL;
- if (max_voltage < min_voltage)
+ if (max_voltage < min_voltage
+ || current_voltage < min_voltage
+ || current_voltage > max_voltage)
return -EINVAL;
+ /* Check for systems using underclocked CPU */
+ if (!freq_failsafe_off && max_multiplier != current_multiplier) {
+ printk(KERN_INFO "eps: Your processor is running at different "
+ "frequency then its maximum. Aborting.\n");
+ printk(KERN_INFO "eps: You can use freq_failsafe_off option "
+ "to disable this check.\n");
+ return -EINVAL;
+ }
+ if (!voltage_failsafe_off && max_voltage != current_voltage) {
+ printk(KERN_INFO "eps: Your processor is running at different "
+ "voltage then its maximum. Aborting.\n");
+ printk(KERN_INFO "eps: You can use voltage_failsafe_off "
+ "option to disable this check.\n");
+ return -EINVAL;
+ }
+
/* Calc FSB speed */
fsb = cpu_khz / current_multiplier;
+
+#if defined CONFIG_ACPI_PROCESSOR || defined CONFIG_ACPI_PROCESSOR_MODULE
+ /* Check for ACPI processor speed limit */
+ if (!ignore_acpi_limit && !eps_acpi_init()) {
+ if (!acpi_processor_get_bios_limit(policy->cpu, &limit)) {
+ printk(KERN_INFO "eps: ACPI limit %u.%uGHz\n",
+ limit/1000000,
+ (limit%1000000)/10000);
+ eps_acpi_exit(policy);
+ /* Check if max_multiplier is in BIOS limits */
+ if (limit && max_multiplier * fsb > limit) {
+ printk(KERN_INFO "eps: Aborting.\n");
+ return -EINVAL;
+ }
+ }
+ }
+#endif
+
+ /* Allow user to set lower maximum voltage then that reported
+ * by processor */
+ if (brand == EPS_BRAND_C7M && set_max_voltage) {
+ u32 v;
+
+ /* Change mV to something hardware can use */
+ v = (set_max_voltage - 700) / 16;
+ /* Check if voltage is within limits */
+ if (v >= min_voltage && v <= max_voltage) {
+ printk(KERN_INFO "eps: Setting %dmV as maximum.\n",
+ v * 16 + 700);
+ max_voltage = v;
+ }
+ }
+
/* Calc number of p-states supported */
if (brand == EPS_BRAND_C7M)
states = max_multiplier - min_multiplier + 1;
@@ -265,6 +372,9 @@ static int eps_cpu_init(struct cpufreq_policy *policy)
/* Copy basic values */
centaur->fsb = fsb;
+#if defined CONFIG_ACPI_PROCESSOR || defined CONFIG_ACPI_PROCESSOR_MODULE
+ centaur->bios_limit = limit;
+#endif
/* Fill frequency and MSR value table */
f_table = &centaur->freq_table[0];
@@ -303,17 +413,7 @@ static int eps_cpu_init(struct cpufreq_policy *policy)
static int eps_cpu_exit(struct cpufreq_policy *policy)
{
unsigned int cpu = policy->cpu;
- struct eps_cpu_data *centaur;
- u32 lo, hi;
- if (eps_cpu[cpu] == NULL)
- return -ENODEV;
- centaur = eps_cpu[cpu];
-
- /* Get max frequency */
- rdmsr(MSR_IA32_PERF_STATUS, lo, hi);
- /* Set max frequency */
- eps_set_state(centaur, cpu, hi & 0xffff);
/* Bye */
cpufreq_frequency_table_put_attr(policy->cpu);
kfree(eps_cpu[cpu]);
@@ -359,6 +459,19 @@ static void __exit eps_exit(void)
cpufreq_unregister_driver(&eps_driver);
}
+/* Allow user to overclock his machine or to change frequency to higher after
+ * unloading module */
+module_param(freq_failsafe_off, int, 0644);
+MODULE_PARM_DESC(freq_failsafe_off, "Disable current vs max frequency check");
+module_param(voltage_failsafe_off, int, 0644);
+MODULE_PARM_DESC(voltage_failsafe_off, "Disable current vs max voltage check");
+#if defined CONFIG_ACPI_PROCESSOR || defined CONFIG_ACPI_PROCESSOR_MODULE
+module_param(ignore_acpi_limit, int, 0644);
+MODULE_PARM_DESC(ignore_acpi_limit, "Don't check ACPI's processor speed limit");
+#endif
+module_param(set_max_voltage, int, 0644);
+MODULE_PARM_DESC(set_max_voltage, "Set maximum CPU voltage (mV) C7-M only");
+
MODULE_AUTHOR("Rafal Bilski <rafalbilski@interia.pl>");
MODULE_DESCRIPTION("Enhanced PowerSaver driver for VIA C7 CPU's.");
MODULE_LICENSE("GPL");