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Diffstat (limited to 'arch/x86/kernel/cpu/cpufreq/longhaul.c')
-rw-r--r--arch/x86/kernel/cpu/cpufreq/longhaul.c193
1 files changed, 98 insertions, 95 deletions
diff --git a/arch/x86/kernel/cpu/cpufreq/longhaul.c b/arch/x86/kernel/cpu/cpufreq/longhaul.c
index a4cff5d6e380..f1c51aea064d 100644
--- a/arch/x86/kernel/cpu/cpufreq/longhaul.c
+++ b/arch/x86/kernel/cpu/cpufreq/longhaul.c
@@ -30,12 +30,12 @@
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/delay.h>
+#include <linux/timex.h>
+#include <linux/io.h>
+#include <linux/acpi.h>
+#include <linux/kernel.h>
#include <asm/msr.h>
-#include <asm/timex.h>
-#include <asm/io.h>
-#include <asm/acpi.h>
-#include <linux/acpi.h>
#include <acpi/processor.h>
#include "longhaul.h"
@@ -58,7 +58,7 @@
#define USE_NORTHBRIDGE (1 << 2)
static int cpu_model;
-static unsigned int numscales=16;
+static unsigned int numscales = 16;
static unsigned int fsb;
static const struct mV_pos *vrm_mV_table;
@@ -67,8 +67,8 @@ static const unsigned char *mV_vrm_table;
static unsigned int highest_speed, lowest_speed; /* kHz */
static unsigned int minmult, maxmult;
static int can_scale_voltage;
-static struct acpi_processor *pr = NULL;
-static struct acpi_processor_cx *cx = NULL;
+static struct acpi_processor *pr;
+static struct acpi_processor_cx *cx;
static u32 acpi_regs_addr;
static u8 longhaul_flags;
static unsigned int longhaul_index;
@@ -78,12 +78,13 @@ static int scale_voltage;
static int disable_acpi_c3;
static int revid_errata;
-#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "longhaul", msg)
+#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, \
+ "longhaul", msg)
/* Clock ratios multiplied by 10 */
-static int clock_ratio[32];
-static int eblcr_table[32];
+static int mults[32];
+static int eblcr[32];
static int longhaul_version;
static struct cpufreq_frequency_table *longhaul_table;
@@ -93,7 +94,7 @@ static char speedbuffer[8];
static char *print_speed(int speed)
{
if (speed < 1000) {
- snprintf(speedbuffer, sizeof(speedbuffer),"%dMHz", speed);
+ snprintf(speedbuffer, sizeof(speedbuffer), "%dMHz", speed);
return speedbuffer;
}
@@ -122,27 +123,28 @@ static unsigned int calc_speed(int mult)
static int longhaul_get_cpu_mult(void)
{
- unsigned long invalue=0,lo, hi;
+ unsigned long invalue = 0, lo, hi;
- rdmsr (MSR_IA32_EBL_CR_POWERON, lo, hi);
- invalue = (lo & (1<<22|1<<23|1<<24|1<<25)) >>22;
- if (longhaul_version==TYPE_LONGHAUL_V2 || longhaul_version==TYPE_POWERSAVER) {
+ rdmsr(MSR_IA32_EBL_CR_POWERON, lo, hi);
+ invalue = (lo & (1<<22|1<<23|1<<24|1<<25))>>22;
+ if (longhaul_version == TYPE_LONGHAUL_V2 ||
+ longhaul_version == TYPE_POWERSAVER) {
if (lo & (1<<27))
- invalue+=16;
+ invalue += 16;
}
- return eblcr_table[invalue];
+ return eblcr[invalue];
}
/* For processor with BCR2 MSR */
-static void do_longhaul1(unsigned int clock_ratio_index)
+static void do_longhaul1(unsigned int mults_index)
{
union msr_bcr2 bcr2;
rdmsrl(MSR_VIA_BCR2, bcr2.val);
/* Enable software clock multiplier */
bcr2.bits.ESOFTBF = 1;
- bcr2.bits.CLOCKMUL = clock_ratio_index & 0xff;
+ bcr2.bits.CLOCKMUL = mults_index & 0xff;
/* Sync to timer tick */
safe_halt();
@@ -161,7 +163,7 @@ static void do_longhaul1(unsigned int clock_ratio_index)
/* For processor with Longhaul MSR */
-static void do_powersaver(int cx_address, unsigned int clock_ratio_index,
+static void do_powersaver(int cx_address, unsigned int mults_index,
unsigned int dir)
{
union msr_longhaul longhaul;
@@ -173,11 +175,11 @@ static void do_powersaver(int cx_address, unsigned int clock_ratio_index,
longhaul.bits.RevisionKey = longhaul.bits.RevisionID;
else
longhaul.bits.RevisionKey = 0;
- longhaul.bits.SoftBusRatio = clock_ratio_index & 0xf;
- longhaul.bits.SoftBusRatio4 = (clock_ratio_index & 0x10) >> 4;
+ longhaul.bits.SoftBusRatio = mults_index & 0xf;
+ longhaul.bits.SoftBusRatio4 = (mults_index & 0x10) >> 4;
/* Setup new voltage */
if (can_scale_voltage)
- longhaul.bits.SoftVID = (clock_ratio_index >> 8) & 0x1f;
+ longhaul.bits.SoftVID = (mults_index >> 8) & 0x1f;
/* Sync to timer tick */
safe_halt();
/* Raise voltage if necessary */
@@ -240,14 +242,14 @@ static void do_powersaver(int cx_address, unsigned int clock_ratio_index,
/**
* longhaul_set_cpu_frequency()
- * @clock_ratio_index : bitpattern of the new multiplier.
+ * @mults_index : bitpattern of the new multiplier.
*
* Sets a new clock ratio.
*/
static void longhaul_setstate(unsigned int table_index)
{
- unsigned int clock_ratio_index;
+ unsigned int mults_index;
int speed, mult;
struct cpufreq_freqs freqs;
unsigned long flags;
@@ -256,9 +258,9 @@ static void longhaul_setstate(unsigned int table_index)
u32 bm_timeout = 1000;
unsigned int dir = 0;
- clock_ratio_index = longhaul_table[table_index].index;
+ mults_index = longhaul_table[table_index].index;
/* Safety precautions */
- mult = clock_ratio[clock_ratio_index & 0x1f];
+ mult = mults[mults_index & 0x1f];
if (mult == -1)
return;
speed = calc_speed(mult);
@@ -274,7 +276,7 @@ static void longhaul_setstate(unsigned int table_index)
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
- dprintk ("Setting to FSB:%dMHz Mult:%d.%dx (%s)\n",
+ dprintk("Setting to FSB:%dMHz Mult:%d.%dx (%s)\n",
fsb, mult/10, mult%10, print_speed(speed/1000));
retry_loop:
preempt_disable();
@@ -282,8 +284,8 @@ retry_loop:
pic2_mask = inb(0xA1);
pic1_mask = inb(0x21); /* works on C3. save mask. */
- outb(0xFF,0xA1); /* Overkill */
- outb(0xFE,0x21); /* TMR0 only */
+ outb(0xFF, 0xA1); /* Overkill */
+ outb(0xFE, 0x21); /* TMR0 only */
/* Wait while PCI bus is busy. */
if (acpi_regs_addr && (longhaul_flags & USE_NORTHBRIDGE
@@ -312,7 +314,7 @@ retry_loop:
* Software controlled multipliers only.
*/
case TYPE_LONGHAUL_V1:
- do_longhaul1(clock_ratio_index);
+ do_longhaul1(mults_index);
break;
/*
@@ -327,9 +329,9 @@ retry_loop:
if (longhaul_flags & USE_ACPI_C3) {
/* Don't allow wakeup */
acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0);
- do_powersaver(cx->address, clock_ratio_index, dir);
+ do_powersaver(cx->address, mults_index, dir);
} else {
- do_powersaver(0, clock_ratio_index, dir);
+ do_powersaver(0, mults_index, dir);
}
break;
}
@@ -341,8 +343,8 @@ retry_loop:
/* Enable bus master arbitration */
acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0);
}
- outb(pic2_mask,0xA1); /* restore mask */
- outb(pic1_mask,0x21);
+ outb(pic2_mask, 0xA1); /* restore mask */
+ outb(pic1_mask, 0x21);
local_irq_restore(flags);
preempt_enable();
@@ -392,7 +394,8 @@ retry_loop:
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
if (!bm_timeout)
- printk(KERN_INFO PFX "Warning: Timeout while waiting for idle PCI bus.\n");
+ printk(KERN_INFO PFX "Warning: Timeout while waiting for "
+ "idle PCI bus.\n");
}
/*
@@ -458,31 +461,32 @@ static int __init longhaul_get_ranges(void)
break;
}
- dprintk ("MinMult:%d.%dx MaxMult:%d.%dx\n",
+ dprintk("MinMult:%d.%dx MaxMult:%d.%dx\n",
minmult/10, minmult%10, maxmult/10, maxmult%10);
highest_speed = calc_speed(maxmult);
lowest_speed = calc_speed(minmult);
- dprintk ("FSB:%dMHz Lowest speed: %s Highest speed:%s\n", fsb,
+ dprintk("FSB:%dMHz Lowest speed: %s Highest speed:%s\n", fsb,
print_speed(lowest_speed/1000),
print_speed(highest_speed/1000));
if (lowest_speed == highest_speed) {
- printk (KERN_INFO PFX "highestspeed == lowest, aborting.\n");
+ printk(KERN_INFO PFX "highestspeed == lowest, aborting.\n");
return -EINVAL;
}
if (lowest_speed > highest_speed) {
- printk (KERN_INFO PFX "nonsense! lowest (%d > %d) !\n",
+ printk(KERN_INFO PFX "nonsense! lowest (%d > %d) !\n",
lowest_speed, highest_speed);
return -EINVAL;
}
- longhaul_table = kmalloc((numscales + 1) * sizeof(struct cpufreq_frequency_table), GFP_KERNEL);
- if(!longhaul_table)
+ longhaul_table = kmalloc((numscales + 1) * sizeof(*longhaul_table),
+ GFP_KERNEL);
+ if (!longhaul_table)
return -ENOMEM;
for (j = 0; j < numscales; j++) {
- ratio = clock_ratio[j];
+ ratio = mults[j];
if (ratio == -1)
continue;
if (ratio > maxmult || ratio < minmult)
@@ -507,13 +511,10 @@ static int __init longhaul_get_ranges(void)
}
}
if (min_i != j) {
- unsigned int temp;
- temp = longhaul_table[j].frequency;
- longhaul_table[j].frequency = longhaul_table[min_i].frequency;
- longhaul_table[min_i].frequency = temp;
- temp = longhaul_table[j].index;
- longhaul_table[j].index = longhaul_table[min_i].index;
- longhaul_table[min_i].index = temp;
+ swap(longhaul_table[j].frequency,
+ longhaul_table[min_i].frequency);
+ swap(longhaul_table[j].index,
+ longhaul_table[min_i].index);
}
}
@@ -521,7 +522,7 @@ static int __init longhaul_get_ranges(void)
/* Find index we are running on */
for (j = 0; j < k; j++) {
- if (clock_ratio[longhaul_table[j].index & 0x1f] == mult) {
+ if (mults[longhaul_table[j].index & 0x1f] == mult) {
longhaul_index = j;
break;
}
@@ -559,20 +560,22 @@ static void __init longhaul_setup_voltagescaling(void)
maxvid = vrm_mV_table[longhaul.bits.MaximumVID];
if (minvid.mV == 0 || maxvid.mV == 0 || minvid.mV > maxvid.mV) {
- printk (KERN_INFO PFX "Bogus values Min:%d.%03d Max:%d.%03d. "
+ printk(KERN_INFO PFX "Bogus values Min:%d.%03d Max:%d.%03d. "
"Voltage scaling disabled.\n",
- minvid.mV/1000, minvid.mV%1000, maxvid.mV/1000, maxvid.mV%1000);
+ minvid.mV/1000, minvid.mV%1000,
+ maxvid.mV/1000, maxvid.mV%1000);
return;
}
if (minvid.mV == maxvid.mV) {
- printk (KERN_INFO PFX "Claims to support voltage scaling but min & max are "
- "both %d.%03d. Voltage scaling disabled\n",
+ printk(KERN_INFO PFX "Claims to support voltage scaling but "
+ "min & max are both %d.%03d. "
+ "Voltage scaling disabled\n",
maxvid.mV/1000, maxvid.mV%1000);
return;
}
- /* How many voltage steps */
+ /* How many voltage steps*/
numvscales = maxvid.pos - minvid.pos + 1;
printk(KERN_INFO PFX
"Max VID=%d.%03d "
@@ -586,7 +589,7 @@ static void __init longhaul_setup_voltagescaling(void)
j = longhaul.bits.MinMHzBR;
if (longhaul.bits.MinMHzBR4)
j += 16;
- min_vid_speed = eblcr_table[j];
+ min_vid_speed = eblcr[j];
if (min_vid_speed == -1)
return;
switch (longhaul.bits.MinMHzFSB) {
@@ -617,7 +620,8 @@ static void __init longhaul_setup_voltagescaling(void)
pos = minvid.pos;
longhaul_table[j].index |= mV_vrm_table[pos] << 8;
vid = vrm_mV_table[mV_vrm_table[pos]];
- printk(KERN_INFO PFX "f: %d kHz, index: %d, vid: %d mV\n", speed, j, vid.mV);
+ printk(KERN_INFO PFX "f: %d kHz, index: %d, vid: %d mV\n",
+ speed, j, vid.mV);
j++;
}
@@ -640,7 +644,8 @@ static int longhaul_target(struct cpufreq_policy *policy,
unsigned int dir = 0;
u8 vid, current_vid;
- if (cpufreq_frequency_table_target(policy, longhaul_table, target_freq, relation, &table_index))
+ if (cpufreq_frequency_table_target(policy, longhaul_table, target_freq,
+ relation, &table_index))
return -EINVAL;
/* Don't set same frequency again */
@@ -656,7 +661,8 @@ static int longhaul_target(struct cpufreq_policy *policy,
* this in hardware, C3 is old and we need to do this
* in software. */
i = longhaul_index;
- current_vid = (longhaul_table[longhaul_index].index >> 8) & 0x1f;
+ current_vid = (longhaul_table[longhaul_index].index >> 8);
+ current_vid &= 0x1f;
if (table_index > longhaul_index)
dir = 1;
while (i != table_index) {
@@ -691,9 +697,9 @@ static acpi_status longhaul_walk_callback(acpi_handle obj_handle,
{
struct acpi_device *d;
- if ( acpi_bus_get_device(obj_handle, &d) ) {
+ if (acpi_bus_get_device(obj_handle, &d))
return 0;
- }
+
*return_value = acpi_driver_data(d);
return 1;
}
@@ -750,7 +756,7 @@ static int longhaul_setup_southbridge(void)
/* Find VT8235 southbridge */
dev = pci_get_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235, NULL);
if (dev == NULL)
- /* Find VT8237 southbridge */
+ /* Find VT8237 southbridge */
dev = pci_get_device(PCI_VENDOR_ID_VIA,
PCI_DEVICE_ID_VIA_8237, NULL);
if (dev != NULL) {
@@ -769,7 +775,8 @@ static int longhaul_setup_southbridge(void)
if (pci_cmd & 1 << 7) {
pci_read_config_dword(dev, 0x88, &acpi_regs_addr);
acpi_regs_addr &= 0xff00;
- printk(KERN_INFO PFX "ACPI I/O at 0x%x\n", acpi_regs_addr);
+ printk(KERN_INFO PFX "ACPI I/O at 0x%x\n",
+ acpi_regs_addr);
}
pci_dev_put(dev);
@@ -781,7 +788,7 @@ static int longhaul_setup_southbridge(void)
static int __init longhaul_cpu_init(struct cpufreq_policy *policy)
{
struct cpuinfo_x86 *c = &cpu_data(0);
- char *cpuname=NULL;
+ char *cpuname = NULL;
int ret;
u32 lo, hi;
@@ -791,8 +798,8 @@ static int __init longhaul_cpu_init(struct cpufreq_policy *policy)
cpu_model = CPU_SAMUEL;
cpuname = "C3 'Samuel' [C5A]";
longhaul_version = TYPE_LONGHAUL_V1;
- memcpy (clock_ratio, samuel1_clock_ratio, sizeof(samuel1_clock_ratio));
- memcpy (eblcr_table, samuel1_eblcr, sizeof(samuel1_eblcr));
+ memcpy(mults, samuel1_mults, sizeof(samuel1_mults));
+ memcpy(eblcr, samuel1_eblcr, sizeof(samuel1_eblcr));
break;
case 7:
@@ -803,10 +810,8 @@ static int __init longhaul_cpu_init(struct cpufreq_policy *policy)
cpuname = "C3 'Samuel 2' [C5B]";
/* Note, this is not a typo, early Samuel2's had
* Samuel1 ratios. */
- memcpy(clock_ratio, samuel1_clock_ratio,
- sizeof(samuel1_clock_ratio));
- memcpy(eblcr_table, samuel2_eblcr,
- sizeof(samuel2_eblcr));
+ memcpy(mults, samuel1_mults, sizeof(samuel1_mults));
+ memcpy(eblcr, samuel2_eblcr, sizeof(samuel2_eblcr));
break;
case 1 ... 15:
longhaul_version = TYPE_LONGHAUL_V1;
@@ -817,10 +822,8 @@ static int __init longhaul_cpu_init(struct cpufreq_policy *policy)
cpu_model = CPU_EZRA;
cpuname = "C3 'Ezra' [C5C]";
}
- memcpy(clock_ratio, ezra_clock_ratio,
- sizeof(ezra_clock_ratio));
- memcpy(eblcr_table, ezra_eblcr,
- sizeof(ezra_eblcr));
+ memcpy(mults, ezra_mults, sizeof(ezra_mults));
+ memcpy(eblcr, ezra_eblcr, sizeof(ezra_eblcr));
break;
}
break;
@@ -829,18 +832,16 @@ static int __init longhaul_cpu_init(struct cpufreq_policy *policy)
cpu_model = CPU_EZRA_T;
cpuname = "C3 'Ezra-T' [C5M]";
longhaul_version = TYPE_POWERSAVER;
- numscales=32;
- memcpy (clock_ratio, ezrat_clock_ratio, sizeof(ezrat_clock_ratio));
- memcpy (eblcr_table, ezrat_eblcr, sizeof(ezrat_eblcr));
+ numscales = 32;
+ memcpy(mults, ezrat_mults, sizeof(ezrat_mults));
+ memcpy(eblcr, ezrat_eblcr, sizeof(ezrat_eblcr));
break;
case 9:
longhaul_version = TYPE_POWERSAVER;
numscales = 32;
- memcpy(clock_ratio,
- nehemiah_clock_ratio,
- sizeof(nehemiah_clock_ratio));
- memcpy(eblcr_table, nehemiah_eblcr, sizeof(nehemiah_eblcr));
+ memcpy(mults, nehemiah_mults, sizeof(nehemiah_mults));
+ memcpy(eblcr, nehemiah_eblcr, sizeof(nehemiah_eblcr));
switch (c->x86_mask) {
case 0 ... 1:
cpu_model = CPU_NEHEMIAH;
@@ -869,14 +870,14 @@ static int __init longhaul_cpu_init(struct cpufreq_policy *policy)
longhaul_version = TYPE_LONGHAUL_V1;
}
- printk (KERN_INFO PFX "VIA %s CPU detected. ", cpuname);
+ printk(KERN_INFO PFX "VIA %s CPU detected. ", cpuname);
switch (longhaul_version) {
case TYPE_LONGHAUL_V1:
case TYPE_LONGHAUL_V2:
- printk ("Longhaul v%d supported.\n", longhaul_version);
+ printk(KERN_CONT "Longhaul v%d supported.\n", longhaul_version);
break;
case TYPE_POWERSAVER:
- printk ("Powersaver supported.\n");
+ printk(KERN_CONT "Powersaver supported.\n");
break;
};
@@ -940,7 +941,7 @@ static int __devexit longhaul_cpu_exit(struct cpufreq_policy *policy)
return 0;
}
-static struct freq_attr* longhaul_attr[] = {
+static struct freq_attr *longhaul_attr[] = {
&cpufreq_freq_attr_scaling_available_freqs,
NULL,
};
@@ -966,13 +967,15 @@ static int __init longhaul_init(void)
#ifdef CONFIG_SMP
if (num_online_cpus() > 1) {
- printk(KERN_ERR PFX "More than 1 CPU detected, longhaul disabled.\n");
+ printk(KERN_ERR PFX "More than 1 CPU detected, "
+ "longhaul disabled.\n");
return -ENODEV;
}
#endif
#ifdef CONFIG_X86_IO_APIC
if (cpu_has_apic) {
- printk(KERN_ERR PFX "APIC detected. Longhaul is currently broken in this configuration.\n");
+ printk(KERN_ERR PFX "APIC detected. Longhaul is currently "
+ "broken in this configuration.\n");
return -ENODEV;
}
#endif
@@ -993,8 +996,8 @@ static void __exit longhaul_exit(void)
{
int i;
- for (i=0; i < numscales; i++) {
- if (clock_ratio[i] == maxmult) {
+ for (i = 0; i < numscales; i++) {
+ if (mults[i] == maxmult) {
longhaul_setstate(i);
break;
}
@@ -1007,11 +1010,11 @@ static void __exit longhaul_exit(void)
/* Even if BIOS is exporting ACPI C3 state, and it is used
* with success when CPU is idle, this state doesn't
* trigger frequency transition in some cases. */
-module_param (disable_acpi_c3, int, 0644);
+module_param(disable_acpi_c3, int, 0644);
MODULE_PARM_DESC(disable_acpi_c3, "Don't use ACPI C3 support");
/* Change CPU voltage with frequency. Very usefull to save
* power, but most VIA C3 processors aren't supporting it. */
-module_param (scale_voltage, int, 0644);
+module_param(scale_voltage, int, 0644);
MODULE_PARM_DESC(scale_voltage, "Scale voltage of processor");
/* Force revision key to 0 for processors which doesn't
* support voltage scaling, but are introducing itself as
@@ -1019,9 +1022,9 @@ MODULE_PARM_DESC(scale_voltage, "Scale voltage of processor");
module_param(revid_errata, int, 0644);
MODULE_PARM_DESC(revid_errata, "Ignore CPU Revision ID");
-MODULE_AUTHOR ("Dave Jones <davej@redhat.com>");
-MODULE_DESCRIPTION ("Longhaul driver for VIA Cyrix processors.");
-MODULE_LICENSE ("GPL");
+MODULE_AUTHOR("Dave Jones <davej@redhat.com>");
+MODULE_DESCRIPTION("Longhaul driver for VIA Cyrix processors.");
+MODULE_LICENSE("GPL");
late_initcall(longhaul_init);
module_exit(longhaul_exit);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.