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-rw-r--r--drivers/cpufreq/Kconfig.x863
-rw-r--r--drivers/cpufreq/acpi-cpufreq.c43
2 files changed, 39 insertions, 7 deletions
diff --git a/drivers/cpufreq/Kconfig.x86 b/drivers/cpufreq/Kconfig.x86
index 78ff7ee48951..8d12e378a7ef 100644
--- a/drivers/cpufreq/Kconfig.x86
+++ b/drivers/cpufreq/Kconfig.x86
@@ -23,7 +23,8 @@ config X86_ACPI_CPUFREQ
help
This driver adds a CPUFreq driver which utilizes the ACPI
Processor Performance States.
- This driver also supports Intel Enhanced Speedstep.
+ This driver also supports Intel Enhanced Speedstep and newer
+ AMD CPUs.
To compile this driver as a module, choose M here: the
module will be called acpi-cpufreq.
diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index 56c6c6b4eb4d..067a61f06bb5 100644
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -54,10 +54,12 @@ MODULE_LICENSE("GPL");
enum {
UNDEFINED_CAPABLE = 0,
SYSTEM_INTEL_MSR_CAPABLE,
+ SYSTEM_AMD_MSR_CAPABLE,
SYSTEM_IO_CAPABLE,
};
#define INTEL_MSR_RANGE (0xffff)
+#define AMD_MSR_RANGE (0x7)
struct acpi_cpufreq_data {
struct acpi_processor_performance *acpi_data;
@@ -82,6 +84,13 @@ static int check_est_cpu(unsigned int cpuid)
return cpu_has(cpu, X86_FEATURE_EST);
}
+static int check_amd_hwpstate_cpu(unsigned int cpuid)
+{
+ struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
+
+ return cpu_has(cpu, X86_FEATURE_HW_PSTATE);
+}
+
static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data)
{
struct acpi_processor_performance *perf;
@@ -101,7 +110,11 @@ static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data)
int i;
struct acpi_processor_performance *perf;
- msr &= INTEL_MSR_RANGE;
+ if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
+ msr &= AMD_MSR_RANGE;
+ else
+ msr &= INTEL_MSR_RANGE;
+
perf = data->acpi_data;
for (i = 0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
@@ -115,6 +128,7 @@ static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data)
{
switch (data->cpu_feature) {
case SYSTEM_INTEL_MSR_CAPABLE:
+ case SYSTEM_AMD_MSR_CAPABLE:
return extract_msr(val, data);
case SYSTEM_IO_CAPABLE:
return extract_io(val, data);
@@ -150,6 +164,7 @@ static void do_drv_read(void *_cmd)
switch (cmd->type) {
case SYSTEM_INTEL_MSR_CAPABLE:
+ case SYSTEM_AMD_MSR_CAPABLE:
rdmsr(cmd->addr.msr.reg, cmd->val, h);
break;
case SYSTEM_IO_CAPABLE:
@@ -174,6 +189,9 @@ static void do_drv_write(void *_cmd)
lo = (lo & ~INTEL_MSR_RANGE) | (cmd->val & INTEL_MSR_RANGE);
wrmsr(cmd->addr.msr.reg, lo, hi);
break;
+ case SYSTEM_AMD_MSR_CAPABLE:
+ wrmsr(cmd->addr.msr.reg, cmd->val, 0);
+ break;
case SYSTEM_IO_CAPABLE:
acpi_os_write_port((acpi_io_address)cmd->addr.io.port,
cmd->val,
@@ -217,6 +235,10 @@ static u32 get_cur_val(const struct cpumask *mask)
cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
cmd.addr.msr.reg = MSR_IA32_PERF_STATUS;
break;
+ case SYSTEM_AMD_MSR_CAPABLE:
+ cmd.type = SYSTEM_AMD_MSR_CAPABLE;
+ cmd.addr.msr.reg = MSR_AMD_PERF_STATUS;
+ break;
case SYSTEM_IO_CAPABLE:
cmd.type = SYSTEM_IO_CAPABLE;
perf = per_cpu(acfreq_data, cpumask_first(mask))->acpi_data;
@@ -326,6 +348,11 @@ static int acpi_cpufreq_target(struct cpufreq_policy *policy,
cmd.addr.msr.reg = MSR_IA32_PERF_CTL;
cmd.val = (u32) perf->states[next_perf_state].control;
break;
+ case SYSTEM_AMD_MSR_CAPABLE:
+ cmd.type = SYSTEM_AMD_MSR_CAPABLE;
+ cmd.addr.msr.reg = MSR_AMD_PERF_CTL;
+ cmd.val = (u32) perf->states[next_perf_state].control;
+ break;
case SYSTEM_IO_CAPABLE:
cmd.type = SYSTEM_IO_CAPABLE;
cmd.addr.io.port = perf->control_register.address;
@@ -580,12 +607,16 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
break;
case ACPI_ADR_SPACE_FIXED_HARDWARE:
pr_debug("HARDWARE addr space\n");
- if (!check_est_cpu(cpu)) {
- result = -ENODEV;
- goto err_unreg;
+ if (check_est_cpu(cpu)) {
+ data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE;
+ break;
}
- data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE;
- break;
+ if (check_amd_hwpstate_cpu(cpu)) {
+ data->cpu_feature = SYSTEM_AMD_MSR_CAPABLE;
+ break;
+ }
+ result = -ENODEV;
+ goto err_unreg;
default:
pr_debug("Unknown addr space %d\n",
(u32) (perf->control_register.space_id));