diff options
Diffstat (limited to 'src/import/chips/p9/procedures/hwp/memory/lib/eff_config/timing.H')
| -rw-r--r-- | src/import/chips/p9/procedures/hwp/memory/lib/eff_config/timing.H | 104 |
1 files changed, 2 insertions, 102 deletions
diff --git a/src/import/chips/p9/procedures/hwp/memory/lib/eff_config/timing.H b/src/import/chips/p9/procedures/hwp/memory/lib/eff_config/timing.H index cb500c798..b4a715fb7 100644 --- a/src/import/chips/p9/procedures/hwp/memory/lib/eff_config/timing.H +++ b/src/import/chips/p9/procedures/hwp/memory/lib/eff_config/timing.H @@ -38,6 +38,7 @@ #include <cstdint> #include <fapi2.H> #include <generic/memory/lib/utils/find.H> +#include <generic/memory/lib/utils/shared/mss_generic_consts.H> #include <lib/utils/conversions.H> namespace mss @@ -62,17 +63,6 @@ enum functions TDLLK = 11, }; -enum guard_band : uint16_t -{ - // Used for caclulating spd timing values - from JEDEC rounding algorithm - // Correction factor is 1% (for DDR3) or 2.5% (for DDR4) - // when doing integer math, we add-in the inverse correction factor - // Formula used for derivation: - // Guardband = 1000 * (1000* correction_factor) - 1 - INVERSE_DDR3_CORRECTION_FACTOR = 989, ///< DDR3 correction factor - INVERSE_DDR4_CORRECTION_FACTOR = 974, ///< DDR4 correction factor -}; - enum refresh_rate : uint8_t { REF1X = 1, ///< Refresh rate 1X @@ -84,96 +74,6 @@ namespace spd { /// -/// @brief Calculates timing value -/// @param[in] i_timing_mtb timing value in MTB units -/// @param[in] i_mtb_multiplier SPD medium timebase -/// @param[in] i_timing_ftb fine offset of timing value -/// @param[in] i_ftb_multiplier SPD fine timebase -/// @return the timing value in picoseconds -/// -inline int64_t calc_timing_from_timebase(const int64_t i_timing_mtb, - const int64_t i_mtb_multiplier, - const int64_t i_timing_ftb, - const int64_t i_ftb_multiplier) -{ - // JEDEC algorithm - const int64_t l_timing_val = i_timing_mtb * i_mtb_multiplier; - const int64_t l_fine_offset = i_timing_ftb * i_ftb_multiplier; - - return l_timing_val + l_fine_offset; -} - -/// -/// @brief Helper to compute JEDEC's SPD rounding algorithm -/// to convert ps to nCK -/// @tparam T input type -/// @tparam OT output type -/// @param[in] i_timing_in_ps timing parameter in ps -/// @param[in] i_tck_in_ps clock period in ps -/// @param[in] i_inverse_corr_factor inverse correction factor (defined by JEDEC) -/// @param[out] o_value_nck the end calculation in nck -/// @return true if overflow didn't occur, false otherwise -/// @note DDR4 SPD Contents Rounding Algorithm -/// @note Item 2220.46 -/// -template<typename T, typename OT> -static inline bool jedec_spd_rounding_alg(const T& i_timing_in_ps, - const T& i_tck_in_ps, - const guard_band i_inverse_corr_factor, - OT& o_val_nck) -{ - // Preliminary nCK calculation, scaled by 1000 per JDEC algorithm - T l_temp_nck = (i_timing_in_ps * CONVERT_PS_IN_A_NS) / (i_tck_in_ps == 0 ? 1 : i_tck_in_ps); - l_temp_nck += i_inverse_corr_factor; - l_temp_nck = l_temp_nck / CONVERT_PS_IN_A_NS; - - // Check for overflow - // static_cast needed for HB compiler that complains about - // comparision of two different integral types - o_val_nck = l_temp_nck; - - FAPI_DBG("Input timing (ps) %d, tCK (ps) %d, temp output %d, output (nCK) %d", - i_timing_in_ps, i_tck_in_ps, l_temp_nck, o_val_nck); - - return (static_cast<T>(o_val_nck) == l_temp_nck); -} - -/// -/// @brief Returns clock cycles based on input application period -/// @tparam T input type -/// @tparam OT output type -/// @param[in] i_timing_in_ps timing parameter in ps -/// @param[in] i_tck_in_ps clock period in ps -/// @param[in] i_inverse_corr_factor inverse correction factor (defined by JEDEC) -/// @param[out] o_value_nck the end calculation in nck -/// @return FAPI2_RC_SUCCESS iff okay -/// @note DDR4 SPD Contents Rounding Algorithm -/// @note Item 2220.46 -/// -template<typename T, typename OT> -inline fapi2::ReturnCode calc_nck(const T& i_timing_in_ps, - const T& i_tck_in_ps, - const guard_band i_inverse_corr_factor, - OT& o_val_nck) -{ - FAPI_ASSERT( jedec_spd_rounding_alg(i_timing_in_ps, - i_tck_in_ps, - i_inverse_corr_factor, - o_val_nck), - fapi2::MSS_INVALID_CAST_CALC_NCK(). - set_TIMING_PS(i_timing_in_ps). - set_NCK_NS(i_tck_in_ps). - set_CORRECTION_FACTOR(i_inverse_corr_factor), - "Overflow occured. Returned data is %d", o_val_nck); - - // If we don't assert, we don't know what's in current_err ... - return fapi2::FAPI2_RC_SUCCESS; - -fapi_try_exit: - return fapi2::current_err; -} - -/// /// @brief Returns clock cycles form picoseconds based on speed bin /// Uses SPD rounding algorithm for DDR4 /// @tparam T the target type from which to get the mt/s @@ -201,7 +101,7 @@ inline OT ps_to_nck( const fapi2::Target<T>& i_target, const OT& i_timing_in_ps) FAPI_TRY( freq_to_ps(l_freq, l_tck_in_ps), "Failed freq() accessor" ); - FAPI_TRY( calc_nck(i_timing_in_ps, l_tck_in_ps, INVERSE_DDR4_CORRECTION_FACTOR, l_temp_nck), + FAPI_TRY( calc_nck(i_timing_in_ps, l_tck_in_ps, spd::INVERSE_DDR4_CORRECTION_FACTOR, l_temp_nck), "Failed calc_nck()" ); return l_temp_nck; |
