* 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/timer.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,
};
#endif
-/* divide by 1000 to get VID. */
+#ifdef CONFIG_CPU_FREQ_DEBUG
+/* divide by 1000 to get VCore voltage in V. */
static int mobile_vid_table[32] = {
2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650,
1600, 1550, 1500, 1450, 1400, 1350, 1300, 0,
1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100,
- 1075, 1050, 1024, 1000, 975, 950, 925, 0,
+ 1075, 1050, 1025, 1000, 975, 950, 925, 0,
};
+#endif
/* 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 struct cpufreq_frequency_table *powernow_table;
static unsigned int latency;
static char have_a0;
+#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "powernow-k7", msg)
+
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;
}
unsigned int speed;
u8 fid, vid;
- powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table) * (number_scales + 1)), GFP_KERNEL);
+ powernow_table = kzalloc((sizeof(struct cpufreq_frequency_table) * (number_scales + 1)), GFP_KERNEL);
if (!powernow_table)
return -ENOMEM;
- memset(powernow_table, 0, (sizeof(struct cpufreq_frequency_table) * (number_scales + 1)));
for (j=0 ; j < number_scales; j++) {
fid = *pst++;
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,
- fid_codes[fid] / 10, fid_codes[fid] % 10, speed/1000);
-
if (speed < minimum_speed)
minimum_speed = speed;
if (speed > maximum_speed)
vid = *pst++;
powernow_table[j].index |= (vid << 8); /* upper 8 bits */
- dprintk ("VID: 0x%x (%d.%03dV)\n", vid, mobile_vid_table[vid]/1000,
- mobile_vid_table[vid]%1000);
+
+ dprintk (" FID: 0x%x (%d.%dx [%dMHz]) "
+ "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10,
+ fid_codes[fid] % 10, speed/1000, vid,
+ mobile_vid_table[vid]/1000,
+ mobile_vid_table[vid]%1000);
}
powernow_table[number_scales].frequency = CPUFREQ_TABLE_END;
powernow_table[number_scales].index = 0;
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;
+static struct acpi_processor_performance *acpi_processor_perf;
static int powernow_acpi_init(void)
{
goto err0;
}
- acpi_processor_perf = kmalloc(sizeof(struct acpi_processor_performance),
+ acpi_processor_perf = kzalloc(sizeof(struct acpi_processor_performance),
GFP_KERNEL);
-
if (!acpi_processor_perf) {
retval = -ENOMEM;
goto err0;
}
- memset(acpi_processor_perf, 0, sizeof(struct acpi_processor_performance));
-
if (acpi_processor_register_performance(acpi_processor_perf, 0)) {
retval = -EIO;
goto err1;
goto err2;
}
- powernow_table = kmalloc((number_scales + 1) * (sizeof(struct cpufreq_frequency_table)), GFP_KERNEL);
+ powernow_table = kzalloc((number_scales + 1) * (sizeof(struct cpufreq_frequency_table)), GFP_KERNEL);
if (!powernow_table) {
retval = -ENOMEM;
goto err2;
}
- memset(powernow_table, 0, ((number_scales + 1) * sizeof(struct cpufreq_frequency_table)));
-
pc.val = (unsigned long) acpi_processor_perf->states[0].control;
for (i = 0; i < number_scales; i++) {
u8 fid, vid;
unsigned int speed;
pc.val = (unsigned long) acpi_processor_perf->states[i].control;
- dprintk (KERN_INFO PFX "acpi: P%d: %d MHz %d mW %d uS control %08x SGTC %d\n",
+ dprintk ("acpi: P%d: %d MHz %d mW %d uS control %08x SGTC %d\n",
i,
(u32) acpi_processor_perf->states[i].core_frequency,
(u32) acpi_processor_perf->states[i].power,
powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
}
- dprintk (KERN_INFO PFX " FID: 0x%x (%d.%dx [%dMHz])\t", 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);
+ dprintk (" FID: 0x%x (%d.%dx [%dMHz]) "
+ "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10,
+ fid_codes[fid] % 10, speed/1000, vid,
+ mobile_vid_table[vid]/1000,
+ mobile_vid_table[vid]%1000);
if (latency < pc.bits.sgtc)
latency = pc.bits.sgtc;
powernow_table[i].frequency = CPUFREQ_TABLE_END;
powernow_table[i].index = 0;
+ /* notify BIOS that we exist */
+ acpi_processor_notify_smm(THIS_MODULE);
+
return 0;
err2:
p = phys_to_virt(i);
if (memcmp(p, "AMDK7PNOW!", 10) == 0){
- dprintk (KERN_INFO PFX "Found PSB header at %p\n", p);
+ dprintk ("Found PSB header at %p\n", p);
psb = (struct psb_s *) p;
- dprintk (KERN_INFO PFX "Table version: 0x%x\n", psb->tableversion);
+ dprintk ("Table version: 0x%x\n", psb->tableversion);
if (psb->tableversion != 0x12) {
printk (KERN_INFO PFX "Sorry, only v1.2 tables supported right now\n");
return -ENODEV;
}
- dprintk (KERN_INFO PFX "Flags: 0x%x (", psb->flags);
+ dprintk ("Flags: 0x%x\n", psb->flags);
if ((psb->flags & 1)==0) {
- dprintk ("Mobile");
+ dprintk ("Mobile voltage regulator\n");
} else {
- dprintk ("Desktop");
+ dprintk ("Desktop voltage regulator\n");
}
- dprintk (" voltage regulator)\n");
latency = psb->settlingtime;
if (latency < 100) {
"Should be at least 100. Correcting.\n", latency);
latency = 100;
}
- dprintk (KERN_INFO PFX "Settling Time: %d microseconds.\n", psb->settlingtime);
- dprintk (KERN_INFO PFX "Has %d PST tables. (Only dumping ones relevant to this CPU).\n", psb->numpst);
+ dprintk ("Settling Time: %d microseconds.\n", psb->settlingtime);
+ dprintk ("Has %d PST tables. (Only dumping ones relevant to this CPU).\n", psb->numpst);
p += sizeof (struct psb_s);
if ((etuple == pst->cpuid) && check_fsb(pst->fsbspeed) &&
(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 ("startvid: 0x%x\n", pst->startvid);
+ dprintk ("PST:%d (@%p)\n", i, pst);
+ dprintk (" cpuid: 0x%x fsb: %d maxFID: 0x%x startvid: 0x%x\n",
+ pst->cpuid, pst->fsbspeed, pst->maxfid, pst->startvid);
ret = get_ranges ((char *) pst + sizeof (struct pst_s));
return ret;
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 */
+ recalibrate_cpu_khz();
+
fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.CFID];
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);
+ dprintk("FSB: %3dMHz\n", 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 int powernow_cpu_exit (struct cpufreq_policy *policy) {
cpufreq_frequency_table_put_attr(policy->cpu);
+
+#ifdef CONFIG_X86_POWERNOW_K7_ACPI
+ if (acpi_processor_perf) {
+ acpi_processor_unregister_performance(acpi_processor_perf, 0);
+ kfree(acpi_processor_perf);
+ }
+#endif
+
+ kfree(powernow_table);
return 0;
}
};
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
- if (acpi_processor_perf) {
- acpi_processor_unregister_performance(acpi_processor_perf, 0);
- kfree(acpi_processor_perf);
- }
-#endif
cpufreq_unregister_driver(&powernow_driver);
- if (powernow_table)
- kfree(powernow_table);
}
-module_param(powernow_acpi_force, int, 0444);
-
-MODULE_PARM_DESC(acpi_force, "Force ACPI to be used");
+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