*********************************************************************/
#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/pci.h>
#include "speedstep-lib.h"
-#define PFX "speedstep-smi: "
-
/* speedstep system management interface port/command.
*
* These parameters are got from IST-SMI BIOS call.
* If user gives it, these are used.
- *
+ *
*/
-static int smi_port = 0;
-static int smi_cmd = 0;
-static unsigned int smi_sig = 0;
+static int smi_port = 0;
+static int smi_cmd = 0;
+static unsigned int smi_sig = 0;
+/* info about the processor */
+static unsigned int speedstep_processor = 0;
-/*
- * There are only two frequency states for each processor. Values
+/*
+ * There are only two frequency states for each processor. Values
* are in kHz for the time being.
*/
static struct cpufreq_frequency_table speedstep_freqs[] = {
- {SPEEDSTEP_HIGH, 0},
+ {SPEEDSTEP_HIGH, 0},
{SPEEDSTEP_LOW, 0},
{0, CPUFREQ_TABLE_END},
};
* of DMA activity going on? */
#define SMI_TRIES 5
-/* DEBUG
- * Define it if you want verbose debug output, e.g. for bug reporting
- */
-//#define SPEEDSTEP_DEBUG
-
-#ifdef SPEEDSTEP_DEBUG
-#define dprintk(msg...) printk(msg)
-#else
-#define dprintk(msg...) do { } while(0)
-#endif
+#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "speedstep-smi", msg)
/**
* speedstep_smi_ownership
command = (smi_sig & 0xffffff00) | (smi_cmd & 0xff);
magic = virt_to_phys(magic_data);
+ dprintk("trying to obtain ownership with command %x at port %x\n", command, smi_port);
+
__asm__ __volatile__(
"out %%al, (%%dx)\n"
: "=D" (result)
- : "a" (command), "b" (function), "c" (0), "d" (smi_port), "D" (0), "S" (magic)
+ : "a" (command), "b" (function), "c" (0), "d" (smi_port),
+ "D" (0), "S" (magic)
+ : "memory"
);
+ dprintk("result is %x\n", result);
+
return result;
}
*/
static int speedstep_smi_get_freqs (unsigned int *low, unsigned int *high)
{
- u32 command, result, edi, high_mhz, low_mhz;
+ u32 command, result = 0, edi, high_mhz, low_mhz;
u32 state=0;
u32 function = GET_SPEEDSTEP_FREQS;
- if (!(ist_info.event & 0xFFFF))
+ if (!(ist_info.event & 0xFFFF)) {
+ dprintk("bug #1422 -- can't read freqs from BIOS\n");
return -ENODEV;
+ }
command = (smi_sig & 0xffffff00) | (smi_cmd & 0xff);
+ dprintk("trying to determine frequencies with command %x at port %x\n", command, smi_port);
+
__asm__ __volatile__("movl $0, %%edi\n"
"out %%al, (%%dx)\n"
: "=a" (result), "=b" (high_mhz), "=c" (low_mhz), "=d" (state), "=D" (edi)
: "a" (command), "b" (function), "c" (state), "d" (smi_port), "S" (0)
);
+
+ dprintk("result %x, low_freq %u, high_freq %u\n", result, low_mhz, high_mhz);
+
+ /* abort if results are obviously incorrect... */
+ if ((high_mhz + low_mhz) < 600)
+ return -EINVAL;
+
*high = high_mhz * 1000;
*low = low_mhz * 1000;
return result;
-}
+}
/**
* speedstep_get_state - set the SpeedStep state
command = (smi_sig & 0xffffff00) | (smi_cmd & 0xff);
+ dprintk("trying to determine current setting with command %x at port %x\n", command, smi_port);
+
__asm__ __volatile__("movl $0, %%edi\n"
"out %%al, (%%dx)\n"
: "=a" (result), "=b" (state), "=D" (edi)
: "a" (command), "b" (function), "c" (0), "d" (smi_port), "S" (0)
);
- return state;
+ dprintk("state is %x, result is %x\n", state, result);
+
+ return (state & 1);
}
+
/**
* speedstep_set_state - set the SpeedStep state
* @state: new processor frequency state (SPEEDSTEP_LOW or SPEEDSTEP_HIGH)
- * @notify: whether to call cpufreq_notify_transition
*
*/
-static void speedstep_set_state (unsigned int state, unsigned int notify)
+static void speedstep_set_state (unsigned int state)
{
- unsigned int old_state, result = 0, command, new_state;
+ unsigned int result = 0, command, new_state;
unsigned long flags;
- struct cpufreq_freqs freqs;
unsigned int function=SET_SPEEDSTEP_STATE;
unsigned int retry = 0;
if (state > 0x1)
return;
- old_state = speedstep_get_state();
- freqs.old = speedstep_freqs[old_state].frequency;
- freqs.new = speedstep_freqs[state].frequency;
- freqs.cpu = 0; /* speedstep.c is UP only driver */
-
- if (old_state == state)
- return;
-
- if (notify)
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
-
/* Disable IRQs */
local_irq_save(flags);
command = (smi_sig & 0xffffff00) | (smi_cmd & 0xff);
+ dprintk("trying to set frequency to state %u with command %x at port %x\n", state, command, smi_port);
+
do {
if (retry) {
- dprintk(KERN_INFO "cpufreq: retry %u, previous result %u\n", retry, result);
+ dprintk("retry %u, previous result %u, waiting...\n", retry, result);
mdelay(retry * 50);
}
retry++;
local_irq_restore(flags);
if (new_state == state) {
- dprintk(KERN_INFO "cpufreq: change to %u MHz succeeded after %u tries with result %u\n", (freqs.new / 1000), retry, result);
+ dprintk("change to %u MHz succeeded after %u tries with result %u\n", (speedstep_freqs[new_state].frequency / 1000), retry, result);
} else {
printk(KERN_ERR "cpufreq: change failed with new_state %u and result %u\n", new_state, result);
}
- if (notify)
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
-
return;
}
* speedstep_target - set a new CPUFreq policy
* @policy: new policy
* @target_freq: new freq
- * @relation:
+ * @relation:
*
* Sets a new CPUFreq policy/freq.
*/
unsigned int target_freq, unsigned int relation)
{
unsigned int newstate = 0;
+ struct cpufreq_freqs freqs;
if (cpufreq_frequency_table_target(policy, &speedstep_freqs[0], target_freq, relation, &newstate))
return -EINVAL;
- speedstep_set_state(newstate, 1);
+ freqs.old = speedstep_freqs[speedstep_get_state()].frequency;
+ freqs.new = speedstep_freqs[newstate].frequency;
+ freqs.cpu = 0; /* speedstep.c is UP only driver */
+
+ if (freqs.old == freqs.new)
+ return 0;
+
+ cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ speedstep_set_state(newstate);
+ cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
return 0;
}
result = speedstep_smi_ownership();
if (result) {
- dprintk(KERN_INFO "cpufreq: fails an aquiring ownership of a SMI interface.\n");
+ dprintk("fails in aquiring ownership of a SMI interface.\n");
return -EINVAL;
}
&speedstep_freqs[SPEEDSTEP_HIGH].frequency);
if (result) {
/* fall back to speedstep_lib.c dection mechanism: try both states out */
- unsigned int speedstep_processor = speedstep_detect_processor();
-
- dprintk(KERN_INFO PFX "could not detect low and high frequencies by SMI call.\n");
- if (!speedstep_processor)
- return -ENODEV;
-
+ dprintk("could not detect low and high frequencies by SMI call.\n");
result = speedstep_get_freqs(speedstep_processor,
&speedstep_freqs[SPEEDSTEP_LOW].frequency,
&speedstep_freqs[SPEEDSTEP_HIGH].frequency,
+ NULL,
&speedstep_set_state);
if (result) {
- dprintk(KERN_INFO PFX "could not detect two different speeds -- aborting.\n");
+ dprintk("could not detect two different speeds -- aborting.\n");
return result;
} else
- dprintk(KERN_INFO PFX "workaround worked.\n");
+ dprintk("workaround worked.\n");
}
/* get current speed setting */
state = speedstep_get_state();
speed = speedstep_freqs[state].frequency;
- dprintk(KERN_INFO "cpufreq: currently at %s speed setting - %i MHz\n",
+ dprintk("currently at %s speed setting - %i MHz\n",
(speed == speedstep_freqs[SPEEDSTEP_LOW].frequency) ? "low" : "high",
(speed / 1000));
if (result)
return (result);
- cpufreq_frequency_table_get_attr(speedstep_freqs, policy->cpu);
+ cpufreq_frequency_table_get_attr(speedstep_freqs, policy->cpu);
return 0;
}
-
static int speedstep_cpu_exit(struct cpufreq_policy *policy)
{
cpufreq_frequency_table_put_attr(policy->cpu);
return 0;
}
+static unsigned int speedstep_get(unsigned int cpu)
+{
+ if (cpu)
+ return -ENODEV;
+ return speedstep_get_processor_frequency(speedstep_processor);
+}
+
static int speedstep_resume(struct cpufreq_policy *policy)
{
int result = speedstep_smi_ownership();
if (result)
- dprintk(KERN_INFO "cpufreq: fails an aquiring ownership of a SMI interface.\n");
+ dprintk("fails in re-aquiring ownership of a SMI interface.\n");
return result;
}
static struct cpufreq_driver speedstep_driver = {
.name = "speedstep-smi",
- .verify = speedstep_verify,
- .target = speedstep_target,
+ .verify = speedstep_verify,
+ .target = speedstep_target,
.init = speedstep_cpu_init,
.exit = speedstep_cpu_exit,
+ .get = speedstep_get,
.resume = speedstep_resume,
.owner = THIS_MODULE,
.attr = speedstep_attr,
*/
static int __init speedstep_init(void)
{
- struct cpuinfo_x86 *c = cpu_data;
+ speedstep_processor = speedstep_detect_processor();
+
+ switch (speedstep_processor) {
+ case SPEEDSTEP_PROCESSOR_PIII_T:
+ case SPEEDSTEP_PROCESSOR_PIII_C:
+ case SPEEDSTEP_PROCESSOR_PIII_C_EARLY:
+ break;
+ default:
+ speedstep_processor = 0;
+ }
- if (c->x86_vendor != X86_VENDOR_INTEL) {
- printk (KERN_INFO PFX "No Intel CPU detected.\n");
+ if (!speedstep_processor) {
+ dprintk ("No supported Intel CPU detected.\n");
return -ENODEV;
}
- dprintk(KERN_DEBUG PFX "signature:0x%.8lx, command:0x%.8lx, event:0x%.8lx, perf_level:0x%.8lx.\n",
+ dprintk("signature:0x%.8lx, command:0x%.8lx, event:0x%.8lx, perf_level:0x%.8lx.\n",
ist_info.signature, ist_info.command, ist_info.event, ist_info.perf_level);
-
- /* Error if no IST-SMI BIOS or no PARM
+ /* Error if no IST-SMI BIOS or no PARM
sig= 'ISGE' aka 'Intel Speedstep Gate E' */
- if ((ist_info.signature != 0x47534943) && (
+ if ((ist_info.signature != 0x47534943) && (
(smi_port == 0) || (smi_cmd == 0)))
return -ENODEV;
smi_sig = ist_info.signature;
/* setup smi_port from MODLULE_PARM or BIOS */
- if ((smi_port > 0xff) || (smi_port < 0)) {
+ if ((smi_port > 0xff) || (smi_port < 0))
return -EINVAL;
- } else if (smi_port == 0) {
+ else if (smi_port == 0)
smi_port = ist_info.command & 0xff;
- }
- if ((smi_cmd > 0xff) || (smi_cmd < 0)) {
+ if ((smi_cmd > 0xff) || (smi_cmd < 0))
return -EINVAL;
- } else if (smi_cmd == 0) {
+ else if (smi_cmd == 0)
smi_cmd = (ist_info.command >> 16) & 0xff;
- }
return cpufreq_register_driver(&speedstep_driver);
}
git://git.onelab.eu / linux-2.6.git / blobdiff