diff options
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/Kconfig.x86 | 3 | ||||
| -rw-r--r-- | drivers/cpufreq/acpi-cpufreq.c | 43 |
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)); |