[CPUFREQ] Prepare powernow-k8 for future CPUs.

Forthcoming AMD products will use a different algorithm for transitioning
pstates than the current generation Opteron products do.  The attached
patch allows the powernow-k8 driver to work with those products.
Signed-off-by: Mark Langsdorf <mark.langsdorf@amd.com>
Signed-off-by: Dave Jones <davej@redhat.com>

arch/i386/kernel/cpu/cpufreq/powernow-k8.c

 /*
- *   (c) 2003, 2004, 2005 Advanced Micro Devices, Inc.
+ *   (c) 2003-2006 Advanced Micro Devices, Inc.
  *  Your use of this code is subject to the terms and conditions of the
  *  GNU general public license version 2. See "COPYING" or
  *  http://www.gnu.org/licenses/gpl.html
@@ -14,7 +14,7 @@
  *  Based upon datasheets & sample CPUs kindly provided by AMD.
  *
  *  Valuable input gratefully received from Dave Jones, Pavel Machek,
- *  Dominik Brodowski, and others.
+ *  Dominik Brodowski, Jacob Shin, and others.
  *  Originally developed by Paul Devriendt.
  *  Processor information obtained from Chapter 9 (Power and Thermal Management)
  *  of the "BIOS and Kernel Developer's Guide for the AMD Athlon 64 and AMD
@@ -46,7 +46,7 @@
 
 #define PFX "powernow-k8: "
 #define BFX PFX "BIOS error: "
-#define VERSION "version 1.60.2"
+#define VERSION "version 2.00.00"
 #include "powernow-k8.h"
 
 /* serialize freq changes  */
@@ -54,6 +54,8 @@ static DEFINE_MUTEX(fidvid_mutex);
 
 static struct powernow_k8_data *powernow_data[NR_CPUS];
 
+static int cpu_family = CPU_OPTERON;
+
 #ifndef CONFIG_SMP
 static cpumask_t cpu_core_map[1];
 #endif
@@ -64,16 +66,36 @@ static u32 find_freq_from_fid(u32 fid)
 	return 800 + (fid * 100);
 }
 
+
 /* Return a frequency in KHz, given an input fid */
 static u32 find_khz_freq_from_fid(u32 fid)
 {
 	return 1000 * find_freq_from_fid(fid);
 }
 
-/* Return a voltage in miliVolts, given an input vid */
-static u32 find_millivolts_from_vid(struct powernow_k8_data *data, u32 vid)
+/* Return a frequency in MHz, given an input fid and did */
+static u32 find_freq_from_fiddid(u32 fid, u32 did)
+{
+	return 100 * (fid + 0x10) >> did;
+}
+
+static u32 find_khz_freq_from_fiddid(u32 fid, u32 did)
 {
-	return 1550-vid*25;
+	return 1000 * find_freq_from_fiddid(fid, did);
+}
+
+static u32 find_fid_from_pstate(u32 pstate)
+{
+	u32 hi, lo;
+	rdmsr(MSR_PSTATE_DEF_BASE + pstate, lo, hi);
+	return lo & HW_PSTATE_FID_MASK;
+}
+
+static u32 find_did_from_pstate(u32 pstate)
+{
+	u32 hi, lo;
+	rdmsr(MSR_PSTATE_DEF_BASE + pstate, lo, hi);
+	return (lo & HW_PSTATE_DID_MASK) >> HW_PSTATE_DID_SHIFT;
 }
 
 /* Return the vco fid for an input fid
@@ -98,6 +120,9 @@ static int pending_bit_stuck(void)
 {
 	u32 lo, hi;
 
+	if (cpu_family)
+		return 0;
+
 	rdmsr(MSR_FIDVID_STATUS, lo, hi);
 	return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
 }
@@ -111,6 +136,14 @@ static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
 	u32 lo, hi;
 	u32 i = 0;
 
+	if (cpu_family) {
+		rdmsr(MSR_PSTATE_STATUS, lo, hi);
+		i = lo & HW_PSTATE_MASK;
+		rdmsr(MSR_PSTATE_DEF_BASE + i, lo, hi);
+		data->currfid = lo & HW_PSTATE_FID_MASK;
+		data->currdid = (lo & HW_PSTATE_DID_MASK) >> HW_PSTATE_DID_SHIFT;
+		return 0;
+	}
 	do {
 		if (i++ > 10000) {
 			dprintk("detected change pending stuck\n");
@@ -175,7 +208,7 @@ static int write_new_fid(struct powernow_k8_data *data, u32 fid)
 	do {
 		wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
 		if (i++ > 100) {
-			printk(KERN_ERR PFX "internal error - pending bit very stuck - no further pstate changes possible\n");
+			printk(KERN_ERR PFX "Hardware error - pending bit very stuck - no further pstate changes possible\n");
 			return 1;
 		}
 	} while (query_current_values_with_pending_wait(data));
@@ -255,7 +288,15 @@ static int decrease_vid_code_by_step(struct powernow_k8_data *data, u32 reqvid,
 	return 0;
 }
 
-/* Change the fid and vid, by the 3 phases. */
+/* Change hardware pstate by single MSR write */
+static int transition_pstate(struct powernow_k8_data *data, u32 pstate)
+{
+	wrmsr(MSR_PSTATE_CTRL, pstate, 0);
+	data->currfid = find_fid_from_pstate(pstate);
+	return 0;
+}
+
+/* Change Opteron/Athlon64 fid and vid, by the 3 phases. */
 static int transition_fid_vid(struct powernow_k8_data *data, u32 reqfid, u32 reqvid)
 {
 	if (core_voltage_pre_transition(data, reqvid))
@@ -474,9 +515,11 @@ static int check_supported_cpu(unsigned int cpu)
 		goto out;
 
 	eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
-	if ((eax & CPUID_XFAM) != CPUID_XFAM_K8)
+	if (((eax & CPUID_XFAM) != CPUID_XFAM_K8) &&
+	    ((eax & CPUID_XFAM) < CPUID_XFAM_10H))
 		goto out;
 
+	if ((eax & CPUID_XFAM) == CPUID_XFAM_K8) {
 		if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
 		    ((eax & CPUID_XMOD) > CPUID_XMOD_REV_G)) {
 			printk(KERN_INFO PFX "Processor cpuid %x not supported\n", eax);
@@ -495,6 +538,13 @@ static int check_supported_cpu(unsigned int cpu)
 			printk(KERN_INFO PFX "Power state transitions not supported\n");
 			goto out;
 		}
+	} else { /* must be a HW Pstate capable processor */
+		cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
+		if ((edx & USE_HW_PSTATE) == USE_HW_PSTATE)
+			cpu_family = CPU_HW_PSTATE;
+		else
+			goto out;
+	}
 
 	rc = 1;
 
@@ -547,12 +597,18 @@ static void print_basics(struct powernow_k8_data *data)
 {
 	int j;
 	for (j = 0; j < data->numps; j++) {
-		if (data->powernow_table[j].frequency != CPUFREQ_ENTRY_INVALID)
-			printk(KERN_INFO PFX "   %d : fid 0x%x (%d MHz), vid 0x%x (%d mV)\n", j,
+		if (data->powernow_table[j].frequency != CPUFREQ_ENTRY_INVALID) {
+			if (cpu_family) {
+			printk(KERN_INFO PFX "   %d : fid 0x%x gid 0x%x (%d MHz)\n", j, (data->powernow_table[j].index & 0xff00) >> 8,
+				(data->powernow_table[j].index & 0xff0000) >> 16,
+				data->powernow_table[j].frequency/1000);
+			} else {
+			printk(KERN_INFO PFX "   %d : fid 0x%x (%d MHz), vid 0x%x\n", j,
 				data->powernow_table[j].index & 0xff,
 				data->powernow_table[j].frequency/1000,
-				data->powernow_table[j].index >> 8,
-				find_millivolts_from_vid(data, data->powernow_table[j].index >> 8));
+				data->powernow_table[j].index >> 8);
+			}
+		}
 	}
 	if (data->batps)
 		printk(KERN_INFO PFX "Only %d pstates on battery\n", data->batps);
@@ -702,7 +758,7 @@ static int find_psb_table(struct powernow_k8_data *data)
 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index)
 {
-	if (!data->acpi_data.state_count)
+	if (!data->acpi_data.state_count || cpu_family)
 		return;
 
 	data->irt = (data->acpi_data.states[index].control >> IRT_SHIFT) & IRT_MASK;
@@ -715,9 +771,8 @@ static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned
 
 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
 {
-	int i;
-	int cntlofreq = 0;
 	struct cpufreq_frequency_table *powernow_table;
+	int ret_val;
 
 	if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
 		dprintk("register performance failed: bad ACPI data\n");
@@ -746,6 +801,85 @@ static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
 		goto err_out;
 	}
 
+	if (cpu_family)
+		ret_val = fill_powernow_table_pstate(data, powernow_table);
+	else
+		ret_val = fill_powernow_table_fidvid(data, powernow_table);
+	if (ret_val)
+		goto err_out_mem;
+
+	powernow_table[data->acpi_data.state_count].frequency = CPUFREQ_TABLE_END;
+	powernow_table[data->acpi_data.state_count].index = 0;
+	data->powernow_table = powernow_table;
+
+	/* fill in data */
+	data->numps = data->acpi_data.state_count;
+	print_basics(data);
+	powernow_k8_acpi_pst_values(data, 0);
+
+	/* notify BIOS that we exist */
+	acpi_processor_notify_smm(THIS_MODULE);
+
+	return 0;
+
+err_out_mem:
+	kfree(powernow_table);
+
+err_out:
+	acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
+
+	/* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
+	data->acpi_data.state_count = 0;
+
+	return -ENODEV;
+}
+
+static int fill_powernow_table_pstate(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table)
+{
+	int i;
+
+	for (i = 0; i < data->acpi_data.state_count; i++) {
+		u32 index;
+		u32 hi = 0, lo = 0;
+		u32 fid;
+		u32 did;
+
+		index = data->acpi_data.states[i].control & HW_PSTATE_MASK;
+		if (index > MAX_HW_PSTATE) {
+			printk(KERN_ERR PFX "invalid pstate %d - bad value %d.\n", i, index);
+			printk(KERN_ERR PFX "Please report to BIOS manufacturer\n");
+		}
+		rdmsr(MSR_PSTATE_DEF_BASE + index, lo, hi);
+		if (!(hi & HW_PSTATE_VALID_MASK)) {
+			dprintk("invalid pstate %d, ignoring\n", index);
+			powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
+			continue;
+		}
+
+		fid = lo & HW_PSTATE_FID_MASK;
+		did = (lo & HW_PSTATE_DID_MASK) >> HW_PSTATE_DID_SHIFT;
+
+		dprintk("   %d : fid 0x%x, did 0x%x\n", index, fid, did);
+
+		powernow_table[i].index = index | (fid << HW_FID_INDEX_SHIFT) | (did << HW_DID_INDEX_SHIFT);
+
+		powernow_table[i].frequency = find_khz_freq_from_fiddid(fid, did);
+
+		if (powernow_table[i].frequency != (data->acpi_data.states[i].core_frequency * 1000)) {
+			printk(KERN_INFO PFX "invalid freq entries %u kHz vs. %u kHz\n",
+				powernow_table[i].frequency,
+				(unsigned int) (data->acpi_data.states[i].core_frequency * 1000));
+			powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
+			continue;
+		}
+	}
+	return 0;
+}
+
+static int fill_powernow_table_fidvid(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table)
+{
+	int i;
+	int cntlofreq = 0;
 	for (i = 0; i < data->acpi_data.state_count; i++) {
 		u32 fid;
 		u32 vid;
@@ -786,7 +920,7 @@ static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
 				if ((powernow_table[i].frequency != powernow_table[cntlofreq].frequency) ||
 				    (powernow_table[i].index != powernow_table[cntlofreq].index)) {
 					printk(KERN_ERR PFX "Too many lo freq table entries\n");
-					goto err_out_mem;
+					return 1;
 				}
 
 				dprintk("double low frequency table entry, ignoring it.\n");
@@ -804,31 +938,7 @@ static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
 			continue;
 		}
 	}
-
-	powernow_table[data->acpi_data.state_count].frequency = CPUFREQ_TABLE_END;
-	powernow_table[data->acpi_data.state_count].index = 0;
-	data->powernow_table = powernow_table;
-
-	/* fill in data */
-	data->numps = data->acpi_data.state_count;
-	print_basics(data);
-	powernow_k8_acpi_pst_values(data, 0);
-
-	/* notify BIOS that we exist */
-	acpi_processor_notify_smm(THIS_MODULE);
-
 	return 0;
-
-err_out_mem:
-	kfree(powernow_table);
-
-err_out:
-	acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
-
-	/* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
-	data->acpi_data.state_count = 0;
-
-	return -ENODEV;
 }
 
 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
@@ -844,20 +954,20 @@ static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned
 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
 
 /* Take a frequency, and issue the fid/vid transition command */
-static int transition_frequency(struct powernow_k8_data *data, unsigned int index)
+static int transition_frequency_fidvid(struct powernow_k8_data *data, unsigned int index)
 {
-	u32 fid;
-	u32 vid;
+	u32 fid = 0;
+	u32 vid = 0;
 	int res, i;
 	struct cpufreq_freqs freqs;
 
 	dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
 
+	/* fid/vid correctness check for k8 */
 	/* fid are the lower 8 bits of the index we stored into
-	 * the cpufreq frequency table in find_psb_table, vid are
-	 * the upper 8 bits.
+	 * the cpufreq frequency table in find_psb_table, vid
+	 * are the upper 8 bits.
 	 */
-
 	fid = data->powernow_table[index].index & 0xFF;
 	vid = (data->powernow_table[index].index & 0xFF00) >> 8;
 
@@ -881,19 +991,55 @@ static int transition_frequency(struct powernow_k8_data *data, unsigned int inde
 
 	dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
 		smp_processor_id(), fid, vid);
-
-	freqs.cpu = data->cpu;
 	freqs.old = find_khz_freq_from_fid(data->currfid);
 	freqs.new = find_khz_freq_from_fid(fid);
-	for_each_cpu_mask(i, cpu_core_map[data->cpu]) {
+
+	for_each_cpu_mask(i, *(data->available_cores)) {
 		freqs.cpu = i;
 		cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
 	}
 
 	res = transition_fid_vid(data, fid, vid);
-
 	freqs.new = find_khz_freq_from_fid(data->currfid);
-	for_each_cpu_mask(i, cpu_core_map[data->cpu]) {
+
+	for_each_cpu_mask(i, *(data->available_cores)) {
+		freqs.cpu = i;
+		cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+	}
+	return res;
+}
+
+/* Take a frequency, and issue the hardware pstate transition command */
+static int transition_frequency_pstate(struct powernow_k8_data *data, unsigned int index)
+{
+	u32 fid = 0;
+	u32 did = 0;
+	u32 pstate = 0;
+	int res, i;
+	struct cpufreq_freqs freqs;
+
+	dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
+
+	/* get fid did for hardware pstate transition */
+	pstate = index & HW_PSTATE_MASK;
+	if (pstate > MAX_HW_PSTATE)
+		return 0;
+	fid = (index & HW_FID_INDEX_MASK) >> HW_FID_INDEX_SHIFT;
+	did = (index & HW_DID_INDEX_MASK) >> HW_DID_INDEX_SHIFT;
+	freqs.old = find_khz_freq_from_fiddid(data->currfid, data->currdid);
+	freqs.new = find_khz_freq_from_fiddid(fid, did);
+
+	for_each_cpu_mask(i, *(data->available_cores)) {
+		freqs.cpu = i;
+		cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+	}
+
+	res = transition_pstate(data, pstate);
+	data->currfid = find_fid_from_pstate(pstate);
+	data->currdid = find_did_from_pstate(pstate);
+	freqs.new = find_khz_freq_from_fiddid(data->currfid, data->currdid);
+
+	for_each_cpu_mask(i, *(data->available_cores)) {
 		freqs.cpu = i;
 		cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
 	}
@@ -936,6 +1082,10 @@ static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsi
 	if (query_current_values_with_pending_wait(data))
 		goto err_out;
 
+	if (cpu_family)
+		dprintk("targ: curr fid 0x%x, did 0x%x\n",
+			data->currfid, data->currvid);
+	else {
 		dprintk("targ: curr fid 0x%x, vid 0x%x\n",
 		data->currfid, data->currvid);
 
@@ -944,6 +1094,7 @@ static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsi
 				"error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
 				checkfid, data->currfid, checkvid, data->currvid);
 		}
+	}
 
 	if (cpufreq_frequency_table_target(pol, data->powernow_table, targfreq, relation, &newstate))
 		goto err_out;
@@ -952,7 +1103,11 @@ static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsi
 
 	powernow_k8_acpi_pst_values(data, newstate);
 
-	if (transition_frequency(data, newstate)) {
+	if (cpu_family)
+		ret = transition_frequency_pstate(data, newstate);
+	else
+		ret = transition_frequency_fidvid(data, newstate);
+	if (ret) {
 		printk(KERN_ERR PFX "transition frequency failed\n");
 		ret = 1;
 		mutex_unlock(&fidvid_mutex);
@@ -960,6 +1115,9 @@ static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsi
 	}
 	mutex_unlock(&fidvid_mutex);
 
+	if (cpu_family)
+		pol->cur = find_khz_freq_from_fiddid(data->currfid, data->currdid);
+	else
 		pol->cur = find_khz_freq_from_fid(data->currfid);
 	ret = 0;
 
@@ -1005,14 +1163,13 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
 		 * Use the PSB BIOS structure. This is only availabe on
 		 * an UP version, and is deprecated by AMD.
 		 */
-
 		if ((num_online_cpus() != 1) || (num_possible_cpus() != 1)) {
 			printk(KERN_ERR PFX "MP systems not supported by PSB BIOS structure\n");
 			kfree(data);
 			return -ENODEV;
 		}
 		if (pol->cpu != 0) {
-			printk(KERN_ERR PFX "init not cpu 0\n");
+			printk(KERN_ERR PFX "No _PSS objects for CPU other than CPU0\n");
 			kfree(data);
 			return -ENODEV;
 		}
@@ -1040,19 +1197,27 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
 	if (query_current_values_with_pending_wait(data))
 		goto err_out;
 
+	if (!cpu_family)
 		fidvid_msr_init();
 
 	/* run on any CPU again */
 	set_cpus_allowed(current, oldmask);
 
 	pol->governor = CPUFREQ_DEFAULT_GOVERNOR;
+	if (cpu_family)
+		pol->cpus = cpumask_of_cpu(pol->cpu);
+	else
 		pol->cpus = cpu_core_map[pol->cpu];
+	data->available_cores = &(pol->cpus);
 
 	/* Take a crude guess here.
 	 * That guess was in microseconds, so multiply with 1000 */
 	pol->cpuinfo.transition_latency = (((data->rvo + 8) * data->vstable * VST_UNITS_20US)
 	    + (3 * (1 << data->irt) * 10)) * 1000;
 
+	if (cpu_family)
+		pol->cur = find_khz_freq_from_fiddid(data->currfid, data->currdid);
+	else
 		pol->cur = find_khz_freq_from_fid(data->currfid);
 	dprintk("policy current frequency %d kHz\n", pol->cur);
 
@@ -1067,7 +1232,11 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
 
 	cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
 
-	printk("cpu_init done, current fid 0x%x, vid 0x%x\n",
+	if (cpu_family)
+		dprintk("cpu_init done, current fid 0x%x, did 0x%x\n",
+			data->currfid, data->currdid);
+	else
+		dprintk("cpu_init done, current fid 0x%x, vid 0x%x\n",
 			data->currfid, data->currvid);
 
 	powernow_data[pol->cpu] = data;
@@ -1154,8 +1323,9 @@ static int __cpuinit powernowk8_init(void)
 	}
 
 	if (supported_cpus == num_online_cpus()) {
-		printk(KERN_INFO PFX "Found %d AMD Athlon 64 / Opteron "
-			"processors (" VERSION ")\n", supported_cpus);
+		printk(KERN_INFO PFX "Found %d %s "
+			"processors (" VERSION ")\n", supported_cpus,
+			boot_cpu_data.x86_model_id);
 		return cpufreq_register_driver(&cpufreq_amd64_driver);
 	}
 

arch/i386/kernel/cpu/cpufreq/powernow-k8.h

 /*
- *  (c) 2003, 2004, 2005 Advanced Micro Devices, Inc.
+ *  (c) 2003-2006 Advanced Micro Devices, Inc.
  *  Your use of this code is subject to the terms and conditions of the
  *  GNU general public license version 2. See "COPYING" or
  *  http://www.gnu.org/licenses/gpl.html
@@ -21,8 +21,8 @@ struct powernow_k8_data {
 	u32 plllock; /* pll lock time, units 1 us */
         u32 exttype; /* extended interface = 1 */
 
-	/* keep track of the current fid / vid */
-	u32 currvid, currfid;
+	/* keep track of the current fid / vid or did */
+	u32 currvid, currfid, currdid;
 
 	/* the powernow_table includes all frequency and vid/fid pairings:
 	 * fid are the lower 8 bits of the index, vid are the upper 8 bits.
@@ -34,6 +34,10 @@ struct powernow_k8_data {
 	 * used to determine valid frequency/vid/fid states */
 	struct acpi_processor_performance acpi_data;
 #endif
+	/* we need to keep track of associated cores, but let cpufreq
+	 * handle hotplug events - so just point at cpufreq pol->cpus
+	 * structure */
+	cpumask_t *available_cores;
 };
 
 
@@ -43,6 +47,7 @@ struct powernow_k8_data {
 #define CPUID_XFAM_K8			0
 #define CPUID_XMOD			0x000f0000	/* extended model */
 #define CPUID_XMOD_REV_G		0x00060000
+#define CPUID_XFAM_10H 			0x00100000	/* family 0x10 */
 #define CPUID_USE_XFAM_XMOD		0x00000f00
 #define CPUID_GET_MAX_CAPABILITIES	0x80000000
 #define CPUID_FREQ_VOLT_CAPABILITIES	0x80000007
@@ -79,6 +84,32 @@ struct powernow_k8_data {
 #define MSR_S_HI_CURRENT_VID      0x0000003f
 #define MSR_C_HI_STP_GNT_BENIGN	  0x00000001
 
+
+/* Hardware Pstate _PSS and MSR definitions */
+#define USE_HW_PSTATE		0x00000080
+#define HW_PSTATE_FID_MASK 	0x0000003f
+#define HW_PSTATE_DID_MASK 	0x000001c0
+#define HW_PSTATE_DID_SHIFT 	6
+#define HW_PSTATE_MASK 		0x00000007
+#define HW_PSTATE_VALID_MASK 	0x80000000
+#define HW_FID_INDEX_SHIFT	8
+#define HW_FID_INDEX_MASK	0x0000ff00
+#define HW_DID_INDEX_SHIFT	16
+#define HW_DID_INDEX_MASK	0x00ff0000
+#define HW_WATTS_MASK		0xff
+#define HW_PWR_DVR_MASK		0x300
+#define HW_PWR_DVR_SHIFT	8
+#define HW_PWR_MAX_MULT		3
+#define MAX_HW_PSTATE		8	/* hw pstate supports up to 8 */
+#define MSR_PSTATE_DEF_BASE 	0xc0010064 /* base of Pstate MSRs */
+#define MSR_PSTATE_STATUS 	0xc0010063 /* Pstate Status MSR */
+#define MSR_PSTATE_CTRL 	0xc0010062 /* Pstate control MSR */
+
+/* define the two driver architectures */
+#define CPU_OPTERON 0
+#define CPU_HW_PSTATE 1
+
+
 /*
  * There are restrictions frequencies have to follow:
  * - only 1 entry in the low fid table ( <=1.4GHz )
@@ -182,6 +213,9 @@ static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid);
 
 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index);
 
+static int fill_powernow_table_pstate(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table);
+static int fill_powernow_table_fidvid(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table);
+
 #ifdef CONFIG_SMP
 static inline void define_siblings(int cpu, cpumask_t cpu_sharedcore_mask[])
 {