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path: root/arch/i386/kernel/cpu/cpufreq/longhaul.c
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Diffstat (limited to 'arch/i386/kernel/cpu/cpufreq/longhaul.c')
-rw-r--r--arch/i386/kernel/cpu/cpufreq/longhaul.c209
1 files changed, 138 insertions, 71 deletions
diff --git a/arch/i386/kernel/cpu/cpufreq/longhaul.c b/arch/i386/kernel/cpu/cpufreq/longhaul.c
index a3df9c039bd..8eca59d4c8f 100644
--- a/arch/i386/kernel/cpu/cpufreq/longhaul.c
+++ b/arch/i386/kernel/cpu/cpufreq/longhaul.c
@@ -29,6 +29,7 @@
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/string.h>
+#include <linux/delay.h>
#include <asm/msr.h>
#include <asm/timex.h>
@@ -55,7 +56,6 @@
/* Flags */
#define USE_ACPI_C3 (1 << 1)
#define USE_NORTHBRIDGE (1 << 2)
-#define USE_VT8235 (1 << 3)
static int cpu_model;
static unsigned int numscales=16;
@@ -63,19 +63,15 @@ static unsigned int fsb;
static const struct mV_pos *vrm_mV_table;
static const unsigned char *mV_vrm_table;
-struct f_msr {
- u8 vrm;
- u8 pos;
-};
-static struct f_msr f_msr_table[32];
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 u32 acpi_regs_addr;
static u8 longhaul_flags;
-static u8 longhaul_pos;
+static unsigned int longhaul_index;
/* Module parameters */
static int scale_voltage;
@@ -144,7 +140,7 @@ static void do_longhaul1(unsigned int clock_ratio_index)
rdmsrl(MSR_VIA_BCR2, bcr2.val);
/* Enable software clock multiplier */
bcr2.bits.ESOFTBF = 1;
- bcr2.bits.CLOCKMUL = clock_ratio_index;
+ bcr2.bits.CLOCKMUL = clock_ratio_index & 0xff;
/* Sync to timer tick */
safe_halt();
@@ -163,14 +159,12 @@ 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 clock_ratio_index,
+ unsigned int dir)
{
union msr_longhaul longhaul;
- u8 dest_pos;
u32 t;
- dest_pos = f_msr_table[clock_ratio_index].pos;
-
rdmsrl(MSR_VIA_LONGHAUL, longhaul.val);
/* Setup new frequency */
longhaul.bits.RevisionKey = longhaul.bits.RevisionID;
@@ -178,11 +172,11 @@ static void do_powersaver(int cx_address, unsigned int clock_ratio_index)
longhaul.bits.SoftBusRatio4 = (clock_ratio_index & 0x10) >> 4;
/* Setup new voltage */
if (can_scale_voltage)
- longhaul.bits.SoftVID = f_msr_table[clock_ratio_index].vrm;
+ longhaul.bits.SoftVID = (clock_ratio_index >> 8) & 0x1f;
/* Sync to timer tick */
safe_halt();
/* Raise voltage if necessary */
- if (can_scale_voltage && longhaul_pos < dest_pos) {
+ if (can_scale_voltage && dir) {
longhaul.bits.EnableSoftVID = 1;
wrmsrl(MSR_VIA_LONGHAUL, longhaul.val);
/* Change voltage */
@@ -199,7 +193,6 @@ static void do_powersaver(int cx_address, unsigned int clock_ratio_index)
}
longhaul.bits.EnableSoftVID = 0;
wrmsrl(MSR_VIA_LONGHAUL, longhaul.val);
- longhaul_pos = dest_pos;
}
/* Change frequency on next halt or sleep */
@@ -220,7 +213,7 @@ static void do_powersaver(int cx_address, unsigned int clock_ratio_index)
wrmsrl(MSR_VIA_LONGHAUL, longhaul.val);
/* Reduce voltage if necessary */
- if (can_scale_voltage && longhaul_pos > dest_pos) {
+ if (can_scale_voltage && !dir) {
longhaul.bits.EnableSoftVID = 1;
wrmsrl(MSR_VIA_LONGHAUL, longhaul.val);
/* Change voltage */
@@ -237,7 +230,6 @@ static void do_powersaver(int cx_address, unsigned int clock_ratio_index)
}
longhaul.bits.EnableSoftVID = 0;
wrmsrl(MSR_VIA_LONGHAUL, longhaul.val);
- longhaul_pos = dest_pos;
}
}
@@ -248,25 +240,28 @@ static void do_powersaver(int cx_address, unsigned int clock_ratio_index)
* Sets a new clock ratio.
*/
-static void longhaul_setstate(unsigned int clock_ratio_index)
+static void longhaul_setstate(unsigned int table_index)
{
+ unsigned int clock_ratio_index;
int speed, mult;
struct cpufreq_freqs freqs;
- static unsigned int old_ratio=-1;
unsigned long flags;
unsigned int pic1_mask, pic2_mask;
+ u16 bm_status = 0;
+ u32 bm_timeout = 1000;
+ unsigned int dir = 0;
- if (old_ratio == clock_ratio_index)
- return;
- old_ratio = clock_ratio_index;
-
- mult = clock_ratio[clock_ratio_index];
+ clock_ratio_index = longhaul_table[table_index].index;
+ /* Safety precautions */
+ mult = clock_ratio[clock_ratio_index & 0x1f];
if (mult == -1)
return;
-
speed = calc_speed(mult);
if ((speed > highest_speed) || (speed < lowest_speed))
return;
+ /* Voltage transition before frequency transition? */
+ if (can_scale_voltage && longhaul_index < table_index)
+ dir = 1;
freqs.old = calc_speed(longhaul_get_cpu_mult());
freqs.new = speed;
@@ -285,11 +280,24 @@ static void longhaul_setstate(unsigned int clock_ratio_index)
outb(0xFF,0xA1); /* Overkill */
outb(0xFE,0x21); /* TMR0 only */
+ /* Wait while PCI bus is busy. */
+ if (acpi_regs_addr && (longhaul_flags & USE_NORTHBRIDGE
+ || ((pr != NULL) && pr->flags.bm_control))) {
+ bm_status = inw(acpi_regs_addr);
+ bm_status &= 1 << 4;
+ while (bm_status && bm_timeout) {
+ outw(1 << 4, acpi_regs_addr);
+ bm_timeout--;
+ bm_status = inw(acpi_regs_addr);
+ bm_status &= 1 << 4;
+ }
+ }
+
if (longhaul_flags & USE_NORTHBRIDGE) {
/* Disable AGP and PCI arbiters */
outb(3, 0x22);
} else if ((pr != NULL) && pr->flags.bm_control) {
- /* Disable bus master arbitration */
+ /* Disable bus master arbitration */
acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1);
}
switch (longhaul_version) {
@@ -314,9 +322,9 @@ static void longhaul_setstate(unsigned int clock_ratio_index)
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);
+ do_powersaver(cx->address, clock_ratio_index, dir);
} else {
- do_powersaver(0, clock_ratio_index);
+ do_powersaver(0, clock_ratio_index, dir);
}
break;
}
@@ -336,6 +344,9 @@ static void longhaul_setstate(unsigned int clock_ratio_index)
freqs.new = calc_speed(longhaul_get_cpu_mult());
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+
+ if (!bm_timeout)
+ printk(KERN_INFO PFX "Warning: Timeout while waiting for idle PCI bus.\n");
}
/*
@@ -369,7 +380,8 @@ static int guess_fsb(int mult)
static int __init longhaul_get_ranges(void)
{
- unsigned int j, k = 0;
+ unsigned int i, j, k = 0;
+ unsigned int ratio;
int mult;
/* Get current frequency */
@@ -423,8 +435,7 @@ static int __init longhaul_get_ranges(void)
if(!longhaul_table)
return -ENOMEM;
- for (j=0; j < numscales; j++) {
- unsigned int ratio;
+ for (j = 0; j < numscales; j++) {
ratio = clock_ratio[j];
if (ratio == -1)
continue;
@@ -434,13 +445,41 @@ static int __init longhaul_get_ranges(void)
longhaul_table[k].index = j;
k++;
}
+ if (k <= 1) {
+ kfree(longhaul_table);
+ return -ENODEV;
+ }
+ /* Sort */
+ for (j = 0; j < k - 1; j++) {
+ unsigned int min_f, min_i;
+ min_f = longhaul_table[j].frequency;
+ min_i = j;
+ for (i = j + 1; i < k; i++) {
+ if (longhaul_table[i].frequency < min_f) {
+ min_f = longhaul_table[i].frequency;
+ min_i = i;
+ }
+ }
+ 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;
+ }
+ }
longhaul_table[k].frequency = CPUFREQ_TABLE_END;
- if (!k) {
- kfree (longhaul_table);
- return -EINVAL;
- }
+ /* Find index we are running on */
+ for (j = 0; j < k; j++) {
+ if (clock_ratio[longhaul_table[j].index & 0x1f] == mult) {
+ longhaul_index = j;
+ break;
+ }
+ }
return 0;
}
@@ -448,7 +487,7 @@ static int __init longhaul_get_ranges(void)
static void __init longhaul_setup_voltagescaling(void)
{
union msr_longhaul longhaul;
- struct mV_pos minvid, maxvid;
+ struct mV_pos minvid, maxvid, vid;
unsigned int j, speed, pos, kHz_step, numvscales;
int min_vid_speed;
@@ -459,11 +498,11 @@ static void __init longhaul_setup_voltagescaling(void)
}
if (!longhaul.bits.VRMRev) {
- printk (KERN_INFO PFX "VRM 8.5\n");
+ printk(KERN_INFO PFX "VRM 8.5\n");
vrm_mV_table = &vrm85_mV[0];
mV_vrm_table = &mV_vrm85[0];
} else {
- printk (KERN_INFO PFX "Mobile VRM\n");
+ printk(KERN_INFO PFX "Mobile VRM\n");
if (cpu_model < CPU_NEHEMIAH)
return;
vrm_mV_table = &mobilevrm_mV[0];
@@ -523,7 +562,6 @@ static void __init longhaul_setup_voltagescaling(void)
/* Calculate kHz for one voltage step */
kHz_step = (highest_speed - min_vid_speed) / numvscales;
-
j = 0;
while (longhaul_table[j].frequency != CPUFREQ_TABLE_END) {
speed = longhaul_table[j].frequency;
@@ -531,15 +569,14 @@ static void __init longhaul_setup_voltagescaling(void)
pos = (speed - min_vid_speed) / kHz_step + minvid.pos;
else
pos = minvid.pos;
- f_msr_table[longhaul_table[j].index].vrm = mV_vrm_table[pos];
- f_msr_table[longhaul_table[j].index].pos = 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);
j++;
}
- longhaul_pos = maxvid.pos;
can_scale_voltage = 1;
- printk(KERN_INFO PFX "Voltage scaling enabled. "
- "Use of \"conservative\" governor is highly recommended.\n");
+ printk(KERN_INFO PFX "Voltage scaling enabled.\n");
}
@@ -553,15 +590,44 @@ static int longhaul_target(struct cpufreq_policy *policy,
unsigned int target_freq, unsigned int relation)
{
unsigned int table_index = 0;
- unsigned int new_clock_ratio = 0;
+ unsigned int i;
+ unsigned int dir = 0;
+ u8 vid, current_vid;
if (cpufreq_frequency_table_target(policy, longhaul_table, target_freq, relation, &table_index))
return -EINVAL;
- new_clock_ratio = longhaul_table[table_index].index & 0xFF;
-
- longhaul_setstate(new_clock_ratio);
+ /* Don't set same frequency again */
+ if (longhaul_index == table_index)
+ return 0;
+ if (!can_scale_voltage)
+ longhaul_setstate(table_index);
+ else {
+ /* On test system voltage transitions exceeding single
+ * step up or down were turning motherboard off. Both
+ * "ondemand" and "userspace" are unsafe. C7 is doing
+ * 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;
+ if (table_index > longhaul_index)
+ dir = 1;
+ while (i != table_index) {
+ vid = (longhaul_table[i].index >> 8) & 0x1f;
+ if (vid != current_vid) {
+ longhaul_setstate(i);
+ current_vid = vid;
+ msleep(200);
+ }
+ if (dir)
+ i++;
+ else
+ i--;
+ }
+ longhaul_setstate(table_index);
+ }
+ longhaul_index = table_index;
return 0;
}
@@ -590,11 +656,10 @@ static acpi_status longhaul_walk_callback(acpi_handle obj_handle,
static int enable_arbiter_disable(void)
{
struct pci_dev *dev;
- int status;
+ int status = 1;
int reg;
u8 pci_cmd;
- status = 1;
/* Find PLE133 host bridge */
reg = 0x78;
dev = pci_get_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8601_0,
@@ -627,13 +692,17 @@ static int enable_arbiter_disable(void)
return 0;
}
-static int longhaul_setup_vt8235(void)
+static int longhaul_setup_southbridge(void)
{
struct pci_dev *dev;
u8 pci_cmd;
/* Find VT8235 southbridge */
dev = pci_get_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235, NULL);
+ if (dev == NULL)
+ /* Find VT8237 southbridge */
+ dev = pci_get_device(PCI_VENDOR_ID_VIA,
+ PCI_DEVICE_ID_VIA_8237, NULL);
if (dev != NULL) {
/* Set transition time to max */
pci_read_config_byte(dev, 0xec, &pci_cmd);
@@ -645,6 +714,14 @@ static int longhaul_setup_vt8235(void)
pci_read_config_byte(dev, 0xe5, &pci_cmd);
pci_cmd |= 1 << 7;
pci_write_config_byte(dev, 0xe5, pci_cmd);
+ /* Get address of ACPI registers block*/
+ pci_read_config_byte(dev, 0x81, &pci_cmd);
+ 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);
+ }
+
pci_dev_put(dev);
return 1;
}
@@ -657,7 +734,6 @@ static int __init longhaul_cpu_init(struct cpufreq_policy *policy)
char *cpuname=NULL;
int ret;
u32 lo, hi;
- int vt8235_present;
/* Check what we have on this motherboard */
switch (c->x86_model) {
@@ -755,7 +831,7 @@ static int __init longhaul_cpu_init(struct cpufreq_policy *policy)
};
/* Doesn't hurt */
- vt8235_present = longhaul_setup_vt8235();
+ longhaul_setup_southbridge();
/* Find ACPI data for processor */
acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
@@ -765,35 +841,26 @@ static int __init longhaul_cpu_init(struct cpufreq_policy *policy)
/* Check ACPI support for C3 state */
if (pr != NULL && longhaul_version == TYPE_POWERSAVER) {
cx = &pr->power.states[ACPI_STATE_C3];
- if (cx->address > 0 && cx->latency <= 1000) {
+ if (cx->address > 0 && cx->latency <= 1000)
longhaul_flags |= USE_ACPI_C3;
- goto print_support_type;
- }
}
/* Check if northbridge is friendly */
- if (enable_arbiter_disable()) {
+ if (enable_arbiter_disable())
longhaul_flags |= USE_NORTHBRIDGE;
- goto print_support_type;
- }
- /* Use VT8235 southbridge if present */
- if (longhaul_version == TYPE_POWERSAVER && vt8235_present) {
- longhaul_flags |= USE_VT8235;
- goto print_support_type;
- }
+
/* Check ACPI support for bus master arbiter disable */
- if ((pr == NULL) || !(pr->flags.bm_control)) {
+ if (!(longhaul_flags & USE_ACPI_C3
+ || longhaul_flags & USE_NORTHBRIDGE)
+ && ((pr == NULL) || !(pr->flags.bm_control))) {
printk(KERN_ERR PFX
"No ACPI support. Unsupported northbridge.\n");
return -ENODEV;
}
-print_support_type:
if (longhaul_flags & USE_NORTHBRIDGE)
- printk (KERN_INFO PFX "Using northbridge support.\n");
- else if (longhaul_flags & USE_VT8235)
- printk (KERN_INFO PFX "Using VT8235 support.\n");
- else
- printk (KERN_INFO PFX "Using ACPI support.\n");
+ printk(KERN_INFO PFX "Using northbridge support.\n");
+ if (longhaul_flags & USE_ACPI_C3)
+ printk(KERN_INFO PFX "Using ACPI support.\n");
ret = longhaul_get_ranges();
if (ret != 0)
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-02 09:53:41 +0000