[RFC PATCH v2 1/4] include: Add defines for SBI CPPC extension

[Xiang W]

在 2023-03-27星期一的 16:27 +0800，Xiang W写道：
> 在 2023-03-23星期四的 14:33 +0530，Sunil V L写道：
> > Add SBI CPPC extension related defines to the
> > SBI ecall interface header.
> > 
> > Signed-off-by: Sunil V L <sunilvl at ventanamicro.com>
> > Reviewed-by: Andrew Jones <ajones at ventanamicro.com>
> > ---
> >  include/sbi/sbi_ecall_interface.h | 34 +++++++++++++++++++++++++++++++
> >  1 file changed, 34 insertions(+)
> > 
> > diff --git a/include/sbi/sbi_ecall_interface.h b/include/sbi/sbi_ecall_interface.h
> > index 4597358..dee2dd9 100644
> > --- a/include/sbi/sbi_ecall_interface.h
> > +++ b/include/sbi/sbi_ecall_interface.h
> > @@ -31,6 +31,7 @@
> >  #define SBI_EXT_PMU                            0x504D55
> >  #define SBI_EXT_DBCN                           0x4442434E
> >  #define SBI_EXT_SUSP                           0x53555350
> > +#define SBI_EXT_CPPC                           0x43505043
> >  
> >  /* SBI function IDs for BASE extension*/
> >  #define SBI_EXT_BASE_GET_SPEC_VERSION          0x0
> > @@ -256,6 +257,39 @@ enum sbi_pmu_ctr_type {
> >  #define SBI_SUSP_SLEEP_TYPE_LAST               SBI_SUSP_SLEEP_TYPE_SUSPEND
> >  #define SBI_SUSP_PLATFORM_SLEEP_START          0x80000000
> >  
> > +/* SBI function IDs for CPPC extension */
> > +#define SBI_EXT_CPPC_PROBE                     0x0
> > +#define SBI_EXT_CPPC_READ                      0x1
> > +#define SBI_EXT_CPPC_READ_HI                   0x2
> > +#define SBI_EXT_CPPC_WRITE                     0x3
> 
> The FID is specified in the documentation:
> https://docs.google.com/document/d/16FLCZtW_JVrN7fnTivHRLH2E7hGdRjMfzDWzsvPRLEc
> 
> sbi_cppc_read    0
> sbi_cppc_read_hi 1
> sbi_cppc_write   2
> 
> We need to modify SBI_EXT_CPPC_PROBE to 0x3
Maybe it's better to change it to 0x8000 to leave space for extending the FID
> 
> Regards,
> Xiang W
> > +
> > +enum sbi_cppc_reg_id {
> > +       SBI_CPPC_HIGHEST_PERF           = 0x00000000,
> > +       SBI_CPPC_NOMINAL_PERF           = 0x00000001,
> > +       SBI_CPPC_LOW_NON_LINEAR_PERF    = 0x00000002,
> > +       SBI_CPPC_LOWEST_PERF            = 0x00000003,
> > +       SBI_CPPC_GUARANTEED_PERF        = 0x00000004,
> > +       SBI_CPPC_DESIRED_PERF           = 0x00000005,
> > +       SBI_CPPC_MIN_PERF               = 0x00000006,
> > +       SBI_CPPC_MAX_PERF               = 0x00000007,
> > +       SBI_CPPC_PERF_REDUC_TOLERANCE   = 0x00000008,
> > +       SBI_CPPC_TIME_WINDOW            = 0x00000009,
> > +       SBI_CPPC_CTR_WRAP_TIME          = 0x0000000A,
> > +       SBI_CPPC_REFERENCE_CTR          = 0x0000000B,
> > +       SBI_CPPC_DELIVERED_CTR          = 0x0000000C,
> > +       SBI_CPPC_PERF_LIMITED           = 0x0000000D,
> > +       SBI_CPPC_ENABLE                 = 0x0000000E,
> > +       SBI_CPPC_AUTO_SEL_ENABLE        = 0x0000000F,
> > +       SBI_CPPC_AUTO_ACT_WINDOW        = 0x00000010,
> > +       SBI_CPPC_ENERGY_PERF_PREFERENCE = 0x00000011,
> > +       SBI_CPPC_REFERENCE_PERF         = 0x00000012,
> > +       SBI_CPPC_LOWEST_FREQ            = 0x00000013,
> > +       SBI_CPPC_NOMINAL_FREQ           = 0x00000014,
> > +       SBI_CPPC_ACPI_LAST              = SBI_CPPC_NOMINAL_FREQ,
> > +       SBI_CPPC_TRANSITION_LATENCY     = 0x80000000,
> > +       SBI_CPPC_NON_ACPI_LAST          = SBI_CPPC_TRANSITION_LATENCY,
> > +};
> > +
> >  /* SBI base specification related macros */
> >  #define SBI_SPEC_VERSION_MAJOR_OFFSET          24
> >  #define SBI_SPEC_VERSION_MAJOR_MASK            0x7f
> > -- 
> > 2.34.1
> > 
> > 
>