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Diffstat (limited to 'arch/x86/kernel/cpu/cpufreq/powernow-k7.c')
-rw-r--r--arch/x86/kernel/cpu/cpufreq/powernow-k7.c239
1 files changed, 138 insertions, 101 deletions
diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k7.c b/arch/x86/kernel/cpu/cpufreq/powernow-k7.c
index 1b446d79a8fd..3c28ccd49742 100644
--- a/arch/x86/kernel/cpu/cpufreq/powernow-k7.c
+++ b/arch/x86/kernel/cpu/cpufreq/powernow-k7.c
@@ -6,10 +6,12 @@
* Licensed under the terms of the GNU GPL License version 2.
* Based upon datasheets & sample CPUs kindly provided by AMD.
*
- * 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.
- * - We disable half multipliers if ACPI is used on A0 stepping CPUs.
+ * Errata 5:
+ * CPU 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:
+ * CPU with half frequency multipliers may hang upon wakeup from disconnect.
+ * - We disable half multipliers if ACPI is used on A0 stepping CPUs.
*/
#include <linux/kernel.h>
@@ -20,11 +22,11 @@
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/dmi.h>
+#include <linux/timex.h>
+#include <linux/io.h>
+#include <asm/timer.h> /* Needed for recalibrate_cpu_khz() */
#include <asm/msr.h>
-#include <asm/timer.h>
-#include <asm/timex.h>
-#include <asm/io.h>
#include <asm/system.h>
#ifdef CONFIG_X86_POWERNOW_K7_ACPI
@@ -58,9 +60,9 @@ struct pst_s {
union powernow_acpi_control_t {
struct {
unsigned long fid:5,
- vid:5,
- sgtc:20,
- res1:2;
+ vid:5,
+ sgtc:20,
+ res1:2;
} bits;
unsigned long val;
};
@@ -94,14 +96,15 @@ static struct cpufreq_frequency_table *powernow_table;
static unsigned int can_scale_bus;
static unsigned int can_scale_vid;
-static unsigned int minimum_speed=-1;
+static unsigned int minimum_speed = -1;
static unsigned int maximum_speed;
static unsigned int number_scales;
static unsigned int fsb;
static unsigned int latency;
static char have_a0;
-#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "powernow-k7", msg)
+#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, \
+ "powernow-k7", msg)
static int check_fsb(unsigned int fsbspeed)
{
@@ -109,7 +112,7 @@ static int check_fsb(unsigned int fsbspeed)
unsigned int f = fsb / 1000;
delta = (fsbspeed > f) ? fsbspeed - f : f - fsbspeed;
- return (delta < 5);
+ return delta < 5;
}
static int check_powernow(void)
@@ -117,24 +120,26 @@ static int check_powernow(void)
struct cpuinfo_x86 *c = &cpu_data(0);
unsigned int maxei, eax, ebx, ecx, edx;
- if ((c->x86_vendor != X86_VENDOR_AMD) || (c->x86 !=6)) {
+ if ((c->x86_vendor != X86_VENDOR_AMD) || (c->x86 != 6)) {
#ifdef MODULE
- printk (KERN_INFO PFX "This module only works with AMD K7 CPUs\n");
+ printk(KERN_INFO PFX "This module only works with "
+ "AMD K7 CPUs\n");
#endif
return 0;
}
/* Get maximum capabilities */
- maxei = cpuid_eax (0x80000000);
+ maxei = cpuid_eax(0x80000000);
if (maxei < 0x80000007) { /* Any powernow info ? */
#ifdef MODULE
- printk (KERN_INFO PFX "No powernow capabilities detected\n");
+ printk(KERN_INFO PFX "No powernow capabilities detected\n");
#endif
return 0;
}
if ((c->x86_model == 6) && (c->x86_mask == 0)) {
- printk (KERN_INFO PFX "K7 660[A0] core detected, enabling errata workarounds\n");
+ printk(KERN_INFO PFX "K7 660[A0] core detected, "
+ "enabling errata workarounds\n");
have_a0 = 1;
}
@@ -144,37 +149,42 @@ static int check_powernow(void)
if (!(edx & (1 << 1 | 1 << 2)))
return 0;
- printk (KERN_INFO PFX "PowerNOW! Technology present. Can scale: ");
+ printk(KERN_INFO PFX "PowerNOW! Technology present. Can scale: ");
if (edx & 1 << 1) {
- printk ("frequency");
- can_scale_bus=1;
+ printk("frequency");
+ can_scale_bus = 1;
}
if ((edx & (1 << 1 | 1 << 2)) == 0x6)
- printk (" and ");
+ printk(" and ");
if (edx & 1 << 2) {
- printk ("voltage");
- can_scale_vid=1;
+ printk("voltage");
+ can_scale_vid = 1;
}
- printk (".\n");
+ printk(".\n");
return 1;
}
+static void invalidate_entry(unsigned int entry)
+{
+ powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID;
+}
-static int get_ranges (unsigned char *pst)
+static int get_ranges(unsigned char *pst)
{
unsigned int j;
unsigned int speed;
u8 fid, vid;
- powernow_table = kzalloc((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;
- for (j=0 ; j < number_scales; j++) {
+ for (j = 0 ; j < number_scales; j++) {
fid = *pst++;
powernow_table[j].frequency = (fsb * fid_codes[fid]) / 10;
@@ -182,10 +192,10 @@ static int get_ranges (unsigned char *pst)
speed = powernow_table[j].frequency;
- if ((fid_codes[fid] % 10)==5) {
+ if ((fid_codes[fid] % 10) == 5) {
#ifdef CONFIG_X86_POWERNOW_K7_ACPI
if (have_a0 == 1)
- powernow_table[j].frequency = CPUFREQ_ENTRY_INVALID;
+ invalidate_entry(j);
#endif
}
@@ -197,7 +207,7 @@ static int get_ranges (unsigned char *pst)
vid = *pst++;
powernow_table[j].index |= (vid << 8); /* upper 8 bits */
- dprintk (" FID: 0x%x (%d.%dx [%dMHz]) "
+ 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,
@@ -214,13 +224,13 @@ static void change_FID(int fid)
{
union msr_fidvidctl fidvidctl;
- rdmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val);
+ rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val);
if (fidvidctl.bits.FID != fid) {
fidvidctl.bits.SGTC = latency;
fidvidctl.bits.FID = fid;
fidvidctl.bits.VIDC = 0;
fidvidctl.bits.FIDC = 1;
- wrmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val);
+ wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val);
}
}
@@ -229,18 +239,18 @@ static void change_VID(int vid)
{
union msr_fidvidctl fidvidctl;
- rdmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val);
+ rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val);
if (fidvidctl.bits.VID != vid) {
fidvidctl.bits.SGTC = latency;
fidvidctl.bits.VID = vid;
fidvidctl.bits.FIDC = 0;
fidvidctl.bits.VIDC = 1;
- wrmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val);
+ wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val);
}
}
-static void change_speed (unsigned int index)
+static void change_speed(unsigned int index)
{
u8 fid, vid;
struct cpufreq_freqs freqs;
@@ -257,7 +267,7 @@ static void change_speed (unsigned int index)
freqs.cpu = 0;
- rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val);
+ rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val);
cfid = fidvidstatus.bits.CFID;
freqs.old = fsb * fid_codes[cfid] / 10;
@@ -321,12 +331,14 @@ static int powernow_acpi_init(void)
goto err1;
}
- if (acpi_processor_perf->control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) {
+ if (acpi_processor_perf->control_register.space_id !=
+ ACPI_ADR_SPACE_FIXED_HARDWARE) {
retval = -ENODEV;
goto err2;
}
- if (acpi_processor_perf->status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) {
+ if (acpi_processor_perf->status_register.space_id !=
+ ACPI_ADR_SPACE_FIXED_HARDWARE) {
retval = -ENODEV;
goto err2;
}
@@ -338,7 +350,8 @@ static int powernow_acpi_init(void)
goto err2;
}
- powernow_table = kzalloc((number_scales + 1) * (sizeof(struct cpufreq_frequency_table)), GFP_KERNEL);
+ powernow_table = kzalloc((sizeof(struct cpufreq_frequency_table) *
+ (number_scales + 1)), GFP_KERNEL);
if (!powernow_table) {
retval = -ENOMEM;
goto err2;
@@ -352,7 +365,7 @@ static int powernow_acpi_init(void)
unsigned int speed, speed_mhz;
pc.val = (unsigned long) state->control;
- dprintk ("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) state->core_frequency,
(u32) state->power,
@@ -381,12 +394,12 @@ static int powernow_acpi_init(void)
if (speed % 1000 > 0)
speed_mhz++;
- if ((fid_codes[fid] % 10)==5) {
+ if ((fid_codes[fid] % 10) == 5) {
if (have_a0 == 1)
- powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
+ invalidate_entry(i);
}
- dprintk (" FID: 0x%x (%d.%dx [%dMHz]) "
+ dprintk(" FID: 0x%x (%d.%dx [%dMHz]) "
"VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10,
fid_codes[fid] % 10, speed_mhz, vid,
mobile_vid_table[vid]/1000,
@@ -422,7 +435,8 @@ err1:
err05:
kfree(acpi_processor_perf);
err0:
- printk(KERN_WARNING PFX "ACPI perflib can not be used in this platform\n");
+ printk(KERN_WARNING PFX "ACPI perflib can not be used on "
+ "this platform\n");
acpi_processor_perf = NULL;
return retval;
}
@@ -435,7 +449,14 @@ static int powernow_acpi_init(void)
}
#endif
-static int powernow_decode_bios (int maxfid, int startvid)
+static void print_pst_entry(struct pst_s *pst, unsigned int j)
+{
+ dprintk("PST:%d (@%p)\n", j, pst);
+ dprintk(" cpuid: 0x%x fsb: %d maxFID: 0x%x startvid: 0x%x\n",
+ pst->cpuid, pst->fsbspeed, pst->maxfid, pst->startvid);
+}
+
+static int powernow_decode_bios(int maxfid, int startvid)
{
struct psb_s *psb;
struct pst_s *pst;
@@ -446,61 +467,67 @@ static int powernow_decode_bios (int maxfid, int startvid)
etuple = cpuid_eax(0x80000001);
- for (i=0xC0000; i < 0xffff0 ; i+=16) {
+ for (i = 0xC0000; i < 0xffff0 ; i += 16) {
p = phys_to_virt(i);
- if (memcmp(p, "AMDK7PNOW!", 10) == 0){
- dprintk ("Found PSB header at %p\n", p);
+ if (memcmp(p, "AMDK7PNOW!", 10) == 0) {
+ dprintk("Found PSB header at %p\n", p);
psb = (struct psb_s *) p;
- dprintk ("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");
+ printk(KERN_INFO PFX "Sorry, only v1.2 tables"
+ " supported right now\n");
return -ENODEV;
}
- dprintk ("Flags: 0x%x\n", psb->flags);
- if ((psb->flags & 1)==0) {
- dprintk ("Mobile voltage regulator\n");
- } else {
- dprintk ("Desktop voltage regulator\n");
- }
+ dprintk("Flags: 0x%x\n", psb->flags);
+ if ((psb->flags & 1) == 0)
+ dprintk("Mobile voltage regulator\n");
+ else
+ dprintk("Desktop voltage regulator\n");
latency = psb->settlingtime;
if (latency < 100) {
- printk(KERN_INFO PFX "BIOS set settling time to %d microseconds. "
- "Should be at least 100. Correcting.\n", latency);
+ printk(KERN_INFO PFX "BIOS set settling time "
+ "to %d microseconds. "
+ "Should be at least 100. "
+ "Correcting.\n", latency);
latency = 100;
}
- dprintk ("Settling Time: %d microseconds.\n", psb->settlingtime);
- dprintk ("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);
+ p += sizeof(struct psb_s);
pst = (struct pst_s *) p;
- for (j=0; j<psb->numpst; j++) {
+ for (j = 0; j < psb->numpst; j++) {
pst = (struct pst_s *) p;
number_scales = pst->numpstates;
- if ((etuple == pst->cpuid) && check_fsb(pst->fsbspeed) &&
- (maxfid==pst->maxfid) && (startvid==pst->startvid))
- {
- dprintk ("PST:%d (@%p)\n", j, 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));
+ if ((etuple == pst->cpuid) &&
+ check_fsb(pst->fsbspeed) &&
+ (maxfid == pst->maxfid) &&
+ (startvid == pst->startvid)) {
+ print_pst_entry(pst, j);
+ p = (char *)pst + sizeof(struct pst_s);
+ ret = get_ranges(p);
return ret;
} else {
unsigned int k;
- p = (char *) pst + sizeof (struct pst_s);
- for (k=0; k<number_scales; k++)
- p+=2;
+ p = (char *)pst + sizeof(struct pst_s);
+ for (k = 0; k < number_scales; k++)
+ p += 2;
}
}
- printk (KERN_INFO PFX "No PST tables match this cpuid (0x%x)\n", etuple);
- printk (KERN_INFO PFX "This is indicative of a broken BIOS.\n");
+ printk(KERN_INFO PFX "No PST tables match this cpuid "
+ "(0x%x)\n", etuple);
+ printk(KERN_INFO PFX "This is indicative of a broken "
+ "BIOS.\n");
return -EINVAL;
}
@@ -511,13 +538,14 @@ static int powernow_decode_bios (int maxfid, int startvid)
}
-static int powernow_target (struct cpufreq_policy *policy,
+static int powernow_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
{
unsigned int newstate;
- if (cpufreq_frequency_table_target(policy, powernow_table, target_freq, relation, &newstate))
+ if (cpufreq_frequency_table_target(policy, powernow_table, target_freq,
+ relation, &newstate))
return -EINVAL;
change_speed(newstate);
@@ -526,7 +554,7 @@ static int powernow_target (struct cpufreq_policy *policy,
}
-static int powernow_verify (struct cpufreq_policy *policy)
+static int powernow_verify(struct cpufreq_policy *policy)
{
return cpufreq_frequency_table_verify(policy, powernow_table);
}
@@ -566,18 +594,23 @@ static unsigned int powernow_get(unsigned int cpu)
if (cpu)
return 0;
- rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val);
+ rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val);
cfid = fidvidstatus.bits.CFID;
- return (fsb * fid_codes[cfid] / 10);
+ return fsb * fid_codes[cfid] / 10;
}
static int __init acer_cpufreq_pst(const 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");
+ printk(KERN_WARNING PFX
+ "%s laptop with broken PST tables in BIOS detected.\n",
+ d->ident);
+ printk(KERN_WARNING PFX
+ "You need to downgrade to 3A21 (09/09/2002), or try a newer "
+ "BIOS than 3A71 (01/20/2003)\n");
+ printk(KERN_WARNING PFX
+ "cpufreq scaling has been disabled as a result of this.\n");
return 0;
}
@@ -598,7 +631,7 @@ static struct dmi_system_id __initdata powernow_dmi_table[] = {
{ }
};
-static int __init powernow_cpu_init (struct cpufreq_policy *policy)
+static int __init powernow_cpu_init(struct cpufreq_policy *policy)
{
union msr_fidvidstatus fidvidstatus;
int result;
@@ -606,7 +639,7 @@ static int __init powernow_cpu_init (struct cpufreq_policy *policy)
if (policy->cpu != 0)
return -ENODEV;
- rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val);
+ rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val);
recalibrate_cpu_khz();
@@ -618,19 +651,21 @@ static int __init powernow_cpu_init (struct cpufreq_policy *policy)
dprintk("FSB: %3dMHz\n", fsb/1000);
if (dmi_check_system(powernow_dmi_table) || acpi_force) {
- printk (KERN_INFO PFX "PSB/PST known to be broken. Trying ACPI instead\n");
+ printk(KERN_INFO PFX "PSB/PST known to be broken. "
+ "Trying ACPI instead\n");
result = powernow_acpi_init();
} else {
- result = powernow_decode_bios(fidvidstatus.bits.MFID, fidvidstatus.bits.SVID);
+ result = powernow_decode_bios(fidvidstatus.bits.MFID,
+ fidvidstatus.bits.SVID);
if (result) {
- printk (KERN_INFO PFX "Trying ACPI perflib\n");
+ printk(KERN_INFO PFX "Trying ACPI perflib\n");
maximum_speed = 0;
minimum_speed = -1;
latency = 0;
result = powernow_acpi_init();
if (result) {
- printk (KERN_INFO PFX "ACPI and legacy methods failed\n");
- printk (KERN_INFO PFX "See http://www.codemonkey.org.uk/projects/cpufreq/powernow-k7.html\n");
+ printk(KERN_INFO PFX
+ "ACPI and legacy methods failed\n");
}
} else {
/* SGTC use the bus clock as timer */
@@ -642,10 +677,11 @@ static int __init powernow_cpu_init (struct cpufreq_policy *policy)
if (result)
return result;
- printk (KERN_INFO PFX "Minimum speed %d MHz. Maximum speed %d MHz.\n",
+ printk(KERN_INFO PFX "Minimum speed %d MHz. Maximum speed %d MHz.\n",
minimum_speed/1000, maximum_speed/1000);
- policy->cpuinfo.transition_latency = cpufreq_scale(2000000UL, fsb, latency);
+ policy->cpuinfo.transition_latency =
+ cpufreq_scale(2000000UL, fsb, latency);
policy->cur = powernow_get(0);
@@ -654,7 +690,8 @@ static int __init powernow_cpu_init (struct cpufreq_policy *policy)
return cpufreq_frequency_table_cpuinfo(policy, powernow_table);
}
-static int powernow_cpu_exit (struct cpufreq_policy *policy) {
+static int powernow_cpu_exit(struct cpufreq_policy *policy)
+{
cpufreq_frequency_table_put_attr(policy->cpu);
#ifdef CONFIG_X86_POWERNOW_K7_ACPI
@@ -669,7 +706,7 @@ static int powernow_cpu_exit (struct cpufreq_policy *policy) {
return 0;
}
-static struct freq_attr* powernow_table_attr[] = {
+static struct freq_attr *powernow_table_attr[] = {
&cpufreq_freq_attr_scaling_available_freqs,
NULL,
};
@@ -685,15 +722,15 @@ static struct cpufreq_driver powernow_driver = {
.attr = powernow_table_attr,
};
-static int __init powernow_init (void)
+static int __init powernow_init(void)
{
- if (check_powernow()==0)
+ if (check_powernow() == 0)
return -ENODEV;
return cpufreq_register_driver(&powernow_driver);
}
-static void __exit powernow_exit (void)
+static void __exit powernow_exit(void)
{
cpufreq_unregister_driver(&powernow_driver);
}
@@ -701,9 +738,9 @@ static void __exit powernow_exit (void)
module_param(acpi_force, int, 0444);
MODULE_PARM_DESC(acpi_force, "Force ACPI to be used.");
-MODULE_AUTHOR ("Dave Jones <davej@redhat.com>");
-MODULE_DESCRIPTION ("Powernow driver for AMD K7 processors.");
-MODULE_LICENSE ("GPL");
+MODULE_AUTHOR("Dave Jones <davej@redhat.com>");
+MODULE_DESCRIPTION("Powernow driver for AMD K7 processors.");
+MODULE_LICENSE("GPL");
late_initcall(powernow_init);
module_exit(powernow_exit);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.