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authorLangsdorf, Mark <mark.langsdorf@amd.com>2005-11-29 14:18:03 -0600
committerDave Jones <davej@redhat.com>2005-11-29 12:46:07 -0800
commit019a61b99338d0ac05de25317b85da88e7ec4b35 (patch)
tree51b3ed2180547ea582a43777244e11f84dd66e4f /arch/i386/kernel/cpu/cpufreq
parent8aae8284fece2b8fc404ccd40b7a30aa96f317b5 (diff)
[PATCH] Support 100 MHz frequency transitions
Future versions of the Opteron processor may support frequency transitions of 100 MHz, instead of the=20 current 200 MHz. This patch enables the powernow-k8 driver to transition to an odd FID code, indicating a multiple of 100 MHz frequency. Signed-off-by: Jacob Shin <jacob.shin@amd.com> Signed-off-by: Mark Langsdorf <mark.langsdorf@amd.com> Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'arch/i386/kernel/cpu/cpufreq')
-rw-r--r--arch/i386/kernel/cpu/cpufreq/powernow-k8.c17
-rw-r--r--arch/i386/kernel/cpu/cpufreq/powernow-k8.h9
2 files changed, 12 insertions, 14 deletions
diff --git a/arch/i386/kernel/cpu/cpufreq/powernow-k8.c b/arch/i386/kernel/cpu/cpufreq/powernow-k8.c
index 34978273680..a342b32c084 100644
--- a/arch/i386/kernel/cpu/cpufreq/powernow-k8.c
+++ b/arch/i386/kernel/cpu/cpufreq/powernow-k8.c
@@ -45,7 +45,7 @@
#define PFX "powernow-k8: "
#define BFX PFX "BIOS error: "
-#define VERSION "version 1.50.5"
+#define VERSION "version 1.60.0"
#include "powernow-k8.h"
/* serialize freq changes */
@@ -336,7 +336,7 @@ static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid
/* Phase 2 - core frequency transition */
static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
{
- u32 vcoreqfid, vcocurrfid, vcofiddiff, savevid = data->currvid;
+ u32 vcoreqfid, vcocurrfid, vcofiddiff, fid_interval, savevid = data->currvid;
if ((reqfid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
printk(KERN_ERR PFX "ph2: illegal lo-lo transition 0x%x 0x%x\n",
@@ -359,9 +359,11 @@ static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
: vcoreqfid - vcocurrfid;
while (vcofiddiff > 2) {
+ (data->currfid & 1) ? (fid_interval = 1) : (fid_interval = 2);
+
if (reqfid > data->currfid) {
if (data->currfid > LO_FID_TABLE_TOP) {
- if (write_new_fid(data, data->currfid + 2)) {
+ if (write_new_fid(data, data->currfid + fid_interval)) {
return 1;
}
} else {
@@ -371,7 +373,7 @@ static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
}
}
} else {
- if (write_new_fid(data, data->currfid - 2))
+ if (write_new_fid(data, data->currfid - fid_interval))
return 1;
}
@@ -474,7 +476,7 @@ static int check_supported_cpu(unsigned int cpu)
eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
((eax & CPUID_XFAM) != CPUID_XFAM_K8) ||
- ((eax & CPUID_XMOD) > CPUID_XMOD_REV_F)) {
+ ((eax & CPUID_XMOD) > CPUID_XMOD_REV_G)) {
printk(KERN_INFO PFX "Processor cpuid %x not supported\n", eax);
goto out;
}
@@ -521,10 +523,6 @@ static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, u8
printk(KERN_ERR BFX "maxfid exceeded with pstate %d\n", j);
return -ENODEV;
}
- if (pst[j].fid & 1) {
- printk(KERN_ERR BFX "fid invalid - %d : 0x%x\n", j, pst[j].fid);
- return -EINVAL;
- }
if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) {
/* Only first fid is allowed to be in "low" range */
printk(KERN_ERR BFX "two low fids - %d : 0x%x\n", j, pst[j].fid);
@@ -1177,4 +1175,3 @@ MODULE_LICENSE("GPL");
late_initcall(powernowk8_init);
module_exit(powernowk8_exit);
-
diff --git a/arch/i386/kernel/cpu/cpufreq/powernow-k8.h b/arch/i386/kernel/cpu/cpufreq/powernow-k8.h
index b1e85bb3639..d0de37d58e9 100644
--- a/arch/i386/kernel/cpu/cpufreq/powernow-k8.h
+++ b/arch/i386/kernel/cpu/cpufreq/powernow-k8.h
@@ -42,7 +42,7 @@ struct powernow_k8_data {
#define CPUID_XFAM 0x0ff00000 /* extended family */
#define CPUID_XFAM_K8 0
#define CPUID_XMOD 0x000f0000 /* extended model */
-#define CPUID_XMOD_REV_F 0x00040000
+#define CPUID_XMOD_REV_G 0x00060000
#define CPUID_USE_XFAM_XMOD 0x00000f00
#define CPUID_GET_MAX_CAPABILITIES 0x80000000
#define CPUID_FREQ_VOLT_CAPABILITIES 0x80000007
@@ -86,13 +86,14 @@ struct powernow_k8_data {
* low fid table
* - lowest entry in the high fid table must be a <= 200MHz + 2 * the entry
* in the low fid table
- * - the parts can only step at 200 MHz intervals, so 1.9 GHz is never valid
+ * - the parts can only step at <= 200 MHz intervals, odd fid values are
+ * supported in revision G and later revisions.
* - lowest frequency must be >= interprocessor hypertransport link speed
* (only applies to MP systems obviously)
*/
/* fids (frequency identifiers) are arranged in 2 tables - lo and hi */
-#define LO_FID_TABLE_TOP 6 /* fid values marking the boundary */
+#define LO_FID_TABLE_TOP 7 /* fid values marking the boundary */
#define HI_FID_TABLE_BOTTOM 8 /* between the low and high tables */
#define LO_VCOFREQ_TABLE_TOP 1400 /* corresponding vco frequency values */
@@ -106,7 +107,7 @@ struct powernow_k8_data {
#define MIN_FREQ 800 /* Min and max freqs, per spec */
#define MAX_FREQ 5000
-#define INVALID_FID_MASK 0xffffffc1 /* not a valid fid if these bits are set */
+#define INVALID_FID_MASK 0xffffffc0 /* not a valid fid if these bits are set */
#define INVALID_VID_MASK 0xffffffc0 /* not a valid vid if these bits are set */
#define VID_OFF 0x3f