* Licensed under the terms of the GNU GPL License version 2.
* Based upon datasheets & sample CPUs kindly provided by AMD.
*
- * BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
- *
* Errata 5: Processor may fail to execute a FID/VID change in presence of interrupt.
* - We cli/sti on stepping A0 CPUs around the FID/VID transition.
* Errata 15: Processors with half frequency multipliers may hang upon wakeup from disconnect.
#include <linux/config.h>
#include <linux/kernel.h>
-#include <linux/module.h>
+#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/slab.h>
#include <linux/string.h>
+#include <linux/dmi.h>
#include <asm/msr.h>
#include <asm/timex.h>
#include <asm/io.h>
#include <asm/system.h>
-#ifdef CONFIG_ACPI_PROCESSOR
+#ifdef CONFIG_X86_POWERNOW_K7_ACPI
#include <linux/acpi.h>
#include <acpi/processor.h>
#endif
#include "powernow-k7.h"
-#define DEBUG
-
-#ifdef DEBUG
-#define dprintk(msg...) printk(msg)
-#else
-#define dprintk(msg...) do { } while(0)
-#endif
-
#define PFX "powernow: "
u8 numpstates;
};
-#ifdef CONFIG_ACPI_PROCESSOR
+#ifdef CONFIG_X86_POWERNOW_K7_ACPI
union powernow_acpi_control_t {
struct {
unsigned long fid:5,
/* divide by 10 to get FID. */
static int fid_codes[32] = {
110, 115, 120, 125, 50, 55, 60, 65,
- 70, 75, 80, 85, 90, 95, 100, 105,
+ 70, 75, 80, 85, 90, 95, 100, 105,
30, 190, 40, 200, 130, 135, 140, 210,
150, 225, 160, 165, 170, 180, -1, -1,
};
* configuration purpose.
*/
-static int powernow_acpi_force;
+static int acpi_force;
+static int debug;
static struct cpufreq_frequency_table *powernow_table;
static unsigned int latency;
static char have_a0;
+static void dprintk(const char *fmt, ...)
+{
+ char s[256];
+ va_list args;
+
+ if (debug==0)
+ return;
+
+ va_start(args,fmt);
+ vsprintf(s, fmt, args);
+ printk(s);
+ va_end(args);
+}
+
+
static int check_fsb(unsigned int fsbspeed)
{
int delta;
}
cpuid(0x80000007, &eax, &ebx, &ecx, &edx);
+
+ /* Check we can actually do something before we say anything.*/
+ if (!(edx & (1 << 1 | 1 << 2)))
+ return 0;
+
printk (KERN_INFO PFX "PowerNOW! Technology present. Can scale: ");
if (edx & 1 << 1) {
can_scale_vid=1;
}
- if (!(edx & (1 << 1 | 1 << 2))) {
- printk ("nothing.\n");
- return 0;
- }
-
printk (".\n");
return 1;
}
speed = powernow_table[j].frequency;
if ((fid_codes[fid] % 10)==5) {
-#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
+#ifdef CONFIG_X86_POWERNOW_K7_ACPI
if (have_a0 == 1)
powernow_table[j].frequency = CPUFREQ_ENTRY_INVALID;
#endif
}
- dprintk (KERN_INFO PFX " FID: 0x%x (%d.%dx [%dMHz])\t", fid,
+ dprintk (KERN_INFO PFX " FID: 0x%x (%d.%dx [%dMHz]) ", fid,
fid_codes[fid] / 10, fid_codes[fid] % 10, speed/1000);
if (speed < minimum_speed)
change_VID(vid);
change_FID(fid);
}
-
+
if (have_a0 == 1)
local_irq_enable();
}
-#ifdef CONFIG_ACPI_PROCESSOR
+#ifdef CONFIG_X86_POWERNOW_K7_ACPI
struct acpi_processor_performance *acpi_processor_perf;
powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
}
- dprintk (KERN_INFO PFX " FID: 0x%x (%d.%dx [%dMHz])\t", fid,
+ dprintk (KERN_INFO PFX " FID: 0x%x (%d.%dx [%dMHz]) ", fid,
fid_codes[fid] / 10, fid_codes[fid] % 10, speed/1000);
dprintk ("VID: 0x%x (%d.%03dV)\n", vid, mobile_vid_table[vid]/1000,
mobile_vid_table[vid]%1000);
(maxfid==pst->maxfid) && (startvid==pst->startvid))
{
dprintk (KERN_INFO PFX "PST:%d (@%p)\n", i, pst);
- dprintk (KERN_INFO PFX " cpuid: 0x%x\t", pst->cpuid);
- dprintk ("fsb: %d\t", pst->fsbspeed);
- dprintk ("maxFID: 0x%x\t", pst->maxfid);
+ dprintk (KERN_INFO PFX " cpuid: 0x%x ", pst->cpuid);
+ dprintk ("fsb: %d ", pst->fsbspeed);
+ dprintk ("maxFID: 0x%x ", pst->maxfid);
dprintk ("startvid: 0x%x\n", pst->startvid);
ret = get_ranges ((char *) pst + sizeof (struct pst_s));
return sgtc;
}
+static unsigned int powernow_get(unsigned int cpu)
+{
+ union msr_fidvidstatus fidvidstatus;
+ unsigned int cfid;
+
+ if (cpu)
+ return 0;
+ rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val);
+ cfid = fidvidstatus.bits.CFID;
+
+ return (fsb * fid_codes[cfid] / 10);
+}
+
+
+static int __init acer_cpufreq_pst(struct dmi_system_id *d)
+{
+ printk(KERN_WARNING "%s laptop with broken PST tables in BIOS detected.\n", d->ident);
+ printk(KERN_WARNING "You need to downgrade to 3A21 (09/09/2002), or try a newer BIOS than 3A71 (01/20/2003)\n");
+ printk(KERN_WARNING "cpufreq scaling has been disabled as a result of this.\n");
+ return 0;
+}
+
+/*
+ * Some Athlon laptops have really fucked PST tables.
+ * A BIOS update is all that can save them.
+ * Mention this, and disable cpufreq.
+ */
+static struct dmi_system_id __initdata powernow_dmi_table[] = {
+ {
+ .callback = acer_cpufreq_pst,
+ .ident = "Acer Aspire",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Insyde Software"),
+ DMI_MATCH(DMI_BIOS_VERSION, "3A71"),
+ },
+ },
+ { }
+};
+
static int __init powernow_cpu_init (struct cpufreq_policy *policy)
{
union msr_fidvidstatus fidvidstatus;
rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val);
/* A K7 with powernow technology is set to max frequency by BIOS */
- fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.CFID];
+ fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.MFID];
if (!fsb) {
printk(KERN_WARNING PFX "can not determine bus frequency\n");
return -EINVAL;
}
dprintk(KERN_INFO PFX "FSB: %3d.%03d MHz\n", fsb/1000, fsb%1000);
- if ((dmi_broken & BROKEN_CPUFREQ) || powernow_acpi_force) {
+ if (dmi_check_system(powernow_dmi_table) || acpi_force) {
printk (KERN_INFO PFX "PSB/PST known to be broken. Trying ACPI instead\n");
result = powernow_acpi_init();
} else {
policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
- policy->cpuinfo.transition_latency = 20 * latency / fsb;
+ policy->cpuinfo.transition_latency = cpufreq_scale(2000000UL, fsb, latency);
- policy->cur = maximum_speed;
+ policy->cur = powernow_get(0);
cpufreq_frequency_table_get_attr(powernow_table, policy->cpu);
};
static struct cpufreq_driver powernow_driver = {
- .verify = powernow_verify,
- .target = powernow_target,
- .init = powernow_cpu_init,
- .exit = powernow_cpu_exit,
- .name = "powernow-k7",
- .owner = THIS_MODULE,
- .attr = powernow_table_attr,
+ .verify = powernow_verify,
+ .target = powernow_target,
+ .get = powernow_get,
+ .init = powernow_cpu_init,
+ .exit = powernow_cpu_exit,
+ .name = "powernow-k7",
+ .owner = THIS_MODULE,
+ .attr = powernow_table_attr,
};
static int __init powernow_init (void)
static void __exit powernow_exit (void)
{
-#ifdef CONFIG_ACPI_PROCESSOR
+#ifdef CONFIG_X86_POWERNOW_K7_ACPI
if (acpi_processor_perf) {
acpi_processor_unregister_performance(acpi_processor_perf, 0);
kfree(acpi_processor_perf);
kfree(powernow_table);
}
-module_param(powernow_acpi_force, int, 0444);
-
-MODULE_PARM_DESC(acpi_force, "Force ACPI to be used");
+module_param(debug, int, 0444);
+MODULE_PARM_DESC(debug, "enable debug output.");
+module_param(acpi_force, int, 0444);
+MODULE_PARM_DESC(acpi_force, "Force ACPI to be used.");
MODULE_AUTHOR ("Dave Jones <davej@codemonkey.org.uk>");
MODULE_DESCRIPTION ("Powernow driver for AMD K7 processors.");
git://git.onelab.eu / linux-2.6.git / blobdiff