device/dram/ddr3: Drop unused MRS helpers

These aren't used anywhere anymore.

Change-Id: I4cf2fc0d07a772886e90fba4f66591a7b0a40e6c
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47343
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

2 files changed, 0 insertions, 353 deletions

diff --git a/src/device/dram/ddr3.c b/src/device/dram/ddr3.c
index d28bfbea4d..0a32d02de9 100644
--- a/src/device/dram/ddr3.c
+++ b/src/device/dram/ddr3.c
@@ -638,226 +638,3 @@ void dram_print_spd_ddr3(const struct dimm_attr_ddr3_st *dimm)
 		printk(BIOS_INFO, "  tCMDmin           : %3u\n",
 		       DIV_ROUND_UP(dimm->tCMD, 256));
 }
-
-/*==============================================================================
- *= DDR3 MRS helpers
- *----------------------------------------------------------------------------*/
-
-/*
- * MRS command structure:
- * cmd[15:0] = Address pins MA[15:0]
- * cmd[18:16] = Bank address BA[2:0]
- */
-
-/* Map tWR value to a bitmask of the MR0 cycle */
-static u16 ddr3_twr_to_mr0_map(u8 twr)
-{
-	if ((twr >= 5) && (twr <= 8))
-		return (twr - 4) << 9;
-
-	/*
-	 * From 8T onwards, we can only use even values. Round up if we are
-	 * given an odd value.
-	 */
-	if ((twr >= 9) && (twr <= 14))
-		return ((twr + 1) >> 1) << 9;
-
-	/* tWR == 16T is [000] */
-	return 0;
-}
-
-/* Map the CAS latency to a bitmask for the MR0 cycle */
-static u16 ddr3_cas_to_mr0_map(u8 cas)
-{
-	u16 mask = 0;
-	/* A[6:4] are bits [2:0] of (CAS - 4) */
-	mask = ((cas - 4) & 0x07) << 4;
-
-	/* A2 is the MSB of (CAS - 4) */
-	if ((cas - 4) & (1 << 3))
-		mask |= (1 << 2);
-
-	return mask;
-}
-
-/**
- * \brief Get command address for a DDR3 MR0 command
- *
- * The DDR3 specification only covers odd write_recovery up to 7T. If an odd
- * write_recovery greater than 7 is specified, it will be rounded up. If a tWR
- * greater than 8 is specified, it is recommended to explicitly round it up or
- * down before calling this function.
- *
- * write_recovery and cas are given in clock cycles. For example, a CAS of 7T
- * should be given as 7.
- *
- * @param precharge_pd
- * @param write_recovery Write recovery latency, tWR in clock cycles.
- * @param dll_reset
- * @param mode
- * @param cas CAS latency in clock cycles.
- * @param burst_type
- * @param burst_length
- */
-mrs_cmd_t ddr3_get_mr0(enum ddr3_mr0_precharge precharge_pd,
-		       u8 write_recovery,
-		       enum ddr3_mr0_dll_reset dll_reset,
-		       enum ddr3_mr0_mode mode,
-		       u8 cas,
-		       enum ddr3_mr0_burst_type burst_type,
-		       enum ddr3_mr0_burst_length burst_length)
-{
-	mrs_cmd_t cmd = 0 << 16;
-
-	if (precharge_pd == DDR3_MR0_PRECHARGE_FAST)
-		cmd |= (1 << 12);
-
-	cmd |= ddr3_twr_to_mr0_map(write_recovery);
-
-	if (dll_reset == DDR3_MR0_DLL_RESET_YES)
-		cmd |= (1 << 8);
-
-	if (mode == DDR3_MR0_MODE_TEST)
-		cmd |= (1 << 7);
-
-	cmd |= ddr3_cas_to_mr0_map(cas);
-
-	if (burst_type == DDR3_MR0_BURST_TYPE_INTERLEAVED)
-		cmd |= (1 << 3);
-
-	cmd |= (burst_length & 0x03) << 0;
-
-	return cmd;
-}
-
-static u16 ddr3_rtt_nom_to_mr1_map(enum ddr3_mr1_rtt_nom rtt_nom)
-{
-	u16 mask = 0;
-	/* A9 <-> rtt_nom[2] */
-	if (rtt_nom & (1 << 2))
-		mask |= (1 << 9);
-	/* A6 <-> rtt_nom[1] */
-	if (rtt_nom & (1 << 1))
-		mask |= (1 << 6);
-	/* A2 <-> rtt_nom[0] */
-	if (rtt_nom & (1 << 0))
-		mask |= (1 << 2);
-
-	return mask;
-}
-
-static u16 ddr3_ods_to_mr1_map(enum ddr3_mr1_ods ods)
-{
-	u16 mask = 0;
-	/* A5 <-> ods[1] */
-	if (ods & (1 << 1))
-		mask |= (1 << 5);
-	/* A1 <-> ods[0] */
-	if (ods & (1 << 0))
-		mask |= (1 << 1);
-
-	return mask;
-}
-
-/**
- * \brief Get command address for a DDR3 MR1 command
- */
-mrs_cmd_t ddr3_get_mr1(enum ddr3_mr1_qoff qoff,
-		       enum ddr3_mr1_tqds tqds,
-		       enum ddr3_mr1_rtt_nom rtt_nom,
-		       enum ddr3_mr1_write_leveling write_leveling,
-		       enum ddr3_mr1_ods ods,
-		       enum ddr3_mr1_additive_latency additive_latency,
-		       enum ddr3_mr1_dll dll_disable)
-{
-	mrs_cmd_t cmd = 1 << 16;
-
-	if (qoff == DDR3_MR1_QOFF_DISABLE)
-		cmd |= (1 << 12);
-
-	if (tqds == DDR3_MR1_TQDS_ENABLE)
-		cmd |= (1 << 11);
-
-	cmd |= ddr3_rtt_nom_to_mr1_map(rtt_nom);
-
-	if (write_leveling == DDR3_MR1_WRLVL_ENABLE)
-		cmd |= (1 << 7);
-
-	cmd |= ddr3_ods_to_mr1_map(ods);
-
-	cmd |= (additive_latency & 0x03) << 3;
-
-	if (dll_disable == DDR3_MR1_DLL_DISABLE)
-		cmd |= (1 << 0);
-
-	return cmd;
-}
-
-/**
- * \brief Get command address for a DDR3 MR2 command
- *
- * cas_cwl is given in clock cycles. For example, a cas_cwl of 7T should be
- * given as 7.
- *
- * @param rtt_wr
- * @param extended_temp
- * @param self_refresh
- * @param cas_cwl CAS write latency in clock cycles.
- */
-
-mrs_cmd_t ddr3_get_mr2(enum ddr3_mr2_rttwr rtt_wr,
-		       enum ddr3_mr2_srt_range extended_temp,
-		       enum ddr3_mr2_asr self_refresh, u8 cas_cwl)
-{
-	mrs_cmd_t cmd = 2 << 16;
-
-	cmd |= (rtt_wr & 0x03) << 9;
-
-	if (extended_temp == DDR3_MR2_SRT_EXTENDED)
-		cmd |= (1 << 7);
-
-	if (self_refresh == DDR3_MR2_ASR_AUTO)
-		cmd |= (1 << 6);
-
-	cmd |= ((cas_cwl - 5) & 0x07) << 3;
-
-	return cmd;
-}
-
-/**
- * \brief Get command address for a DDR3 MR3 command
- *
- * @param dataflow_from_mpr Specify a non-zero value to put DRAM in read
- *			    leveling mode. Zero for normal operation.
- */
-mrs_cmd_t ddr3_get_mr3(char dataflow_from_mpr)
-{
-	mrs_cmd_t cmd = 3 << 16;
-
-	if (dataflow_from_mpr)
-		cmd |= (1 << 2);
-
-	return cmd;
-}
-
-/**
- * \brief Mirror the address bits for this MRS command
- *
- * Swap the following bits in the MRS command:
- *	- MA3 <-> MA4
- *	- MA5 <-> MA6
- *	- MA7 <-> MA8
- *	- BA0 <-> BA1
- */
-mrs_cmd_t ddr3_mrs_mirror_pins(mrs_cmd_t cmd)
-{
-	u32 downshift, upshift;
-	/* High bits=    A4    |    A6    |    A8    |    BA1 */
-	/* Low bits =    A3    |    A5    |    A7    |    BA0 */
-	u32 lowbits = (1 << 3) | (1 << 5) | (1 << 7) | (1 << 16);
-	downshift = (cmd & (lowbits << 1));
-	upshift = (cmd & lowbits);
-	cmd &= ~(lowbits | (lowbits << 1));
-	cmd |= (downshift >> 1) | (upshift << 1);
-	return cmd;
-}
diff --git a/src/include/device/dram/ddr3.h b/src/include/device/dram/ddr3.h
index 17910ff4bd..9ec5248af7 100644
--- a/src/include/device/dram/ddr3.h
+++ b/src/include/device/dram/ddr3.h
@@ -181,135 +181,5 @@ int spd_xmp_decode_ddr3(struct dimm_attr_ddr3_st *dimm,
 enum cb_err spd_add_smbios17(const u8 channel, const u8 slot,
 			     const u16 selected_freq,
 			     const struct dimm_attr_ddr3_st *info);
-/**
- * \brief Read double word from specified address
- *
- * Should be useful when doing an MRS to the DIMM
- */
-static inline u32 volatile_read(volatile uintptr_t addr)
-{
-	volatile u32 result;
-	result = *(volatile u32 *)addr;
-	return result;
-}
-
-/**
- * \brief Representation of an MRS command
- *
- * This represents an MRS command as seen by the DIMM. This is not a memory
- * address that can be read to generate an MRS command. The mapping of CPU
- * to memory pins is hardware-dependent.
- * \n
- * The idea is to generalize the MRS code, and only need a hardware-specific
- * function to map the MRS bits to CPU address bits. An MRS command can be
- * sent like:
- * @code{.c}
- *	u32 addr;
- *	mrs_cmd_t mrs;
- *	chipset_enable_mrs_command_mode();
- *	mrs = ddr3_get_mr2(rtt_wr, srt, asr, cwl)
- *	if (rank_has_mirrorred_pins)
- *		mrs = ddr3_mrs_mirror_pins(mrs);
- *	addr = chipset_specific_get_mrs_addr(mrs);
- *	volatile_read(addr);
- * @endcode
- *
- * The MRS representation has the following structure:
- *	- cmd[15:0] = Address pins MA[15:0]
- *	- cmd[18:16] = Bank address BA[2:0]
- */
-typedef u32 mrs_cmd_t;
-
-enum ddr3_mr0_precharge {
-	DDR3_MR0_PRECHARGE_SLOW = 0,
-	DDR3_MR0_PRECHARGE_FAST = 1,
-};
-enum ddr3_mr0_mode {
-	DDR3_MR0_MODE_NORMAL = 0,
-	DDR3_MR0_MODE_TEST = 1,
-};
-enum ddr3_mr0_dll_reset {
-	DDR3_MR0_DLL_RESET_NO = 0,
-	DDR3_MR0_DLL_RESET_YES = 1,
-};
-enum ddr3_mr0_burst_type {
-	DDR3_MR0_BURST_TYPE_SEQUENTIAL = 0,
-	DDR3_MR0_BURST_TYPE_INTERLEAVED = 1,
-};
-enum ddr3_mr0_burst_length {
-	DDR3_MR0_BURST_LENGTH_8 = 0,
-	DDR3_MR0_BURST_LENGTH_CHOP = 1,
-	DDR3_MR0_BURST_LENGTH_4 = 2,
-};
-mrs_cmd_t ddr3_get_mr0(enum ddr3_mr0_precharge precharge_pd,
-		       u8 write_recovery,
-		       enum ddr3_mr0_dll_reset dll_reset,
-		       enum ddr3_mr0_mode mode,
-		       u8 cas,
-		       enum ddr3_mr0_burst_type interleaved_burst,
-		       enum ddr3_mr0_burst_length burst_length);
-
-enum ddr3_mr1_qoff {
-	DDR3_MR1_QOFF_ENABLE = 0,
-	DDR3_MR1_QOFF_DISABLE = 1,
-};
-enum ddr3_mr1_tqds {
-	DDR3_MR1_TQDS_DISABLE = 0,
-	DDR3_MR1_TQDS_ENABLE = 1,
-};
-enum ddr3_mr1_write_leveling {
-	DDR3_MR1_WRLVL_DISABLE = 0,
-	DDR3_MR1_WRLVL_ENABLE = 1,
-};
-enum ddr3_mr1_rtt_nom {
-	DDR3_MR1_RTT_NOM_OFF = 0,
-	DDR3_MR1_RTT_NOM_RZQ4 = 1,
-	DDR3_MR1_RTT_NOM_RZQ2 = 2,
-	DDR3_MR1_RTT_NOM_RZQ6 = 3,
-	DDR3_MR1_RTT_NOM_RZQ12 = 4,
-	DDR3_MR1_RTT_NOM_RZQ8 = 5,
-};
-enum ddr3_mr1_additive_latency {
-	DDR3_MR1_AL_DISABLE = 0,
-	DDR3_MR1_AL_CL_MINUS_1 = 1,
-	DDR3_MR1_AL_CL_MINUS_2 = 2,
-};
-enum ddr3_mr1_ods {
-	DDR3_MR1_ODS_RZQ6 = 0,
-	DDR3_MR1_ODS_RZQ7 = 1,
-};
-enum ddr3_mr1_dll {
-	DDR3_MR1_DLL_ENABLE = 0,
-	DDR3_MR1_DLL_DISABLE = 1,
-};
-
-mrs_cmd_t ddr3_get_mr1(enum ddr3_mr1_qoff qoff,
-		       enum ddr3_mr1_tqds tqds,
-		       enum ddr3_mr1_rtt_nom rtt_nom,
-		       enum ddr3_mr1_write_leveling write_leveling,
-		       enum ddr3_mr1_ods output_drive_strenght,
-		       enum ddr3_mr1_additive_latency additive_latency,
-		       enum ddr3_mr1_dll dll_disable);
-
-enum ddr3_mr2_rttwr {
-	DDR3_MR2_RTTWR_OFF = 0,
-	DDR3_MR2_RTTWR_RZQ4 = 1,
-	DDR3_MR2_RTTWR_RZQ2 = 2,
-};
-enum ddr3_mr2_srt_range {
-	DDR3_MR2_SRT_NORMAL = 0,
-	DDR3_MR2_SRT_EXTENDED = 1,
-};
-enum ddr3_mr2_asr {
-	DDR3_MR2_ASR_MANUAL = 0,
-	DDR3_MR2_ASR_AUTO = 1,
-};
-
-mrs_cmd_t ddr3_get_mr2(enum ddr3_mr2_rttwr rtt_wr,
-		       enum ddr3_mr2_srt_range extended_temp,
-		       enum ddr3_mr2_asr self_refresh, u8 cas_cwl);
-
-mrs_cmd_t ddr3_get_mr3(char dataflow_from_mpr);
-mrs_cmd_t ddr3_mrs_mirror_pins(mrs_cmd_t cmd);
 
 #endif /* DEVICE_DRAM_DDR3L_H */