diff options
Diffstat (limited to 'cpu/mpc8xxx/ddr/ctrl_regs.c')
| -rw-r--r-- | cpu/mpc8xxx/ddr/ctrl_regs.c | 380 |
1 files changed, 344 insertions, 36 deletions
diff --git a/cpu/mpc8xxx/ddr/ctrl_regs.c b/cpu/mpc8xxx/ddr/ctrl_regs.c index 4c1498c..490e3dc 100644 --- a/cpu/mpc8xxx/ddr/ctrl_regs.c +++ b/cpu/mpc8xxx/ddr/ctrl_regs.c @@ -23,11 +23,18 @@ extern unsigned int picos_to_mclk(unsigned int picos); * * This should likely be either board or controller specific. * - * Rtt(nominal): + * Rtt(nominal) - DDR2: * 0 = Rtt disabled * 1 = 75 ohm * 2 = 150 ohm * 3 = 50 ohm + * Rtt(nominal) - DDR3: + * 0 = Rtt disabled + * 1 = 60 ohm + * 2 = 120 ohm + * 3 = 40 ohm + * 4 = 20 ohm + * 5 = 30 ohm * * FIXME: Apparently 8641 needs a value of 2 * FIXME: Old code seys if 667 MHz or higher, use 3 on 8572 @@ -53,12 +60,37 @@ static inline int fsl_ddr_get_rtt(void) #elif defined(CONFIG_FSL_DDR2) rtt = 3; #else -#error "Need Rtt value for DDR3" + rtt = 0; #endif return rtt; } +/* + * compute the CAS write latency according to DDR3 spec + * CWL = 5 if tCK >= 2.5ns + * 6 if 2.5ns > tCK >= 1.875ns + * 7 if 1.875ns > tCK >= 1.5ns + * 8 if 1.5ns > tCK >= 1.25ns + */ +static inline unsigned int compute_cas_write_latency(void) +{ + unsigned int cwl; + const unsigned int mclk_ps = get_memory_clk_period_ps(); + + if (mclk_ps >= 2500) + cwl = 5; + else if (mclk_ps >= 1875) + cwl = 6; + else if (mclk_ps >= 1500) + cwl = 7; + else if (mclk_ps >= 1250) + cwl = 8; + else + cwl = 8; + return cwl; +} + /* Chip Select Configuration (CSn_CONFIG) */ static void set_csn_config(int i, fsl_ddr_cfg_regs_t *ddr, const memctl_options_t *popts, @@ -126,7 +158,7 @@ static void set_csn_config_2(int i, fsl_ddr_cfg_regs_t *ddr) /* -3E = 667 CL5, -25 = CL6 800, -25E = CL5 800 */ -#if defined(CONFIG_FSL_DDR2) +#if !defined(CONFIG_FSL_DDR1) /* * DDR SDRAM Timing Configuration 0 (TIMING_CFG_0) * @@ -150,16 +182,32 @@ static void set_timing_cfg_0(fsl_ddr_cfg_regs_t *ddr) /* Mode register set cycle time (tMRD). */ unsigned char tmrd_mclk; - /* (tXARD and tXARDS). Empirical? */ - act_pd_exit_mclk = 2; - - /* XXX: tXARD = 2, tXARDS = 7 - AL. * Empirical? */ +#if defined(CONFIG_FSL_DDR3) + /* + * (tXARD and tXARDS). Empirical? + * The DDR3 spec has not tXARD, + * we use the tXP instead of it. + * tXP=max(3nCK, 7.5ns) for DDR3. + * we use the tXP=6 + * spec has not the tAXPD, we use + * tAXPD=8, need design to confirm. + */ + act_pd_exit_mclk = 6; pre_pd_exit_mclk = 6; - - /* FIXME: tXP = 2 on Micron 667 MHz DIMM */ taxpd_mclk = 8; - + tmrd_mclk = 4; +#else /* CONFIG_FSL_DDR2 */ + /* + * (tXARD and tXARDS). Empirical? + * tXARD = 2 for DDR2 + * tXP=2 + * tAXPD=8 + */ + act_pd_exit_mclk = 2; + pre_pd_exit_mclk = 2; + taxpd_mclk = 8; tmrd_mclk = 2; +#endif ddr->timing_cfg_0 = (0 | ((trwt_mclk & 0x3) << 30) /* RWT */ @@ -177,7 +225,8 @@ static void set_timing_cfg_0(fsl_ddr_cfg_regs_t *ddr) /* DDR SDRAM Timing Configuration 3 (TIMING_CFG_3) */ static void set_timing_cfg_3(fsl_ddr_cfg_regs_t *ddr, - const common_timing_params_t *common_dimm) + const common_timing_params_t *common_dimm, + unsigned int cas_latency) { /* Extended Activate to precharge interval (tRAS) */ unsigned int ext_acttopre = 0; @@ -190,6 +239,11 @@ static void set_timing_cfg_3(fsl_ddr_cfg_regs_t *ddr, ext_acttopre = 1; ext_refrec = (picos_to_mclk(common_dimm->tRFC_ps) - 8) >> 4; + + /* If the CAS latency more than 8, use the ext mode */ + if (cas_latency > 8) + ext_caslat = 1; + ddr->timing_cfg_3 = (0 | ((ext_acttopre & 0x1) << 24) | ((ext_refrec & 0xF) << 16) @@ -201,6 +255,7 @@ static void set_timing_cfg_3(fsl_ddr_cfg_regs_t *ddr, /* DDR SDRAM Timing Configuration 1 (TIMING_CFG_1) */ static void set_timing_cfg_1(fsl_ddr_cfg_regs_t *ddr, + const memctl_options_t *popts, const common_timing_params_t *common_dimm, unsigned int cas_latency) { @@ -246,13 +301,42 @@ static void set_timing_cfg_1(fsl_ddr_cfg_regs_t *ddr, #elif defined(CONFIG_FSL_DDR2) caslat_ctrl = 2 * cas_latency - 1; #else -#error "Need CAS Latency help for DDR3 in fsl_ddr_sdram.c" + /* + * if the CAS latency more than 8 cycle, + * we need set extend bit for it at + * TIMING_CFG_3[EXT_CASLAT] + */ + if (cas_latency > 8) + cas_latency -= 8; + caslat_ctrl = 2 * cas_latency - 1; #endif refrec_ctrl = picos_to_mclk(common_dimm->tRFC_ps) - 8; wrrec_mclk = picos_to_mclk(common_dimm->tWR_ps); + if (popts->OTF_burst_chop_en) + wrrec_mclk += 2; + acttoact_mclk = picos_to_mclk(common_dimm->tRRD_ps); + /* + * JEDEC has min requirement for tRRD + */ +#if defined(CONFIG_FSL_DDR3) + if (acttoact_mclk < 4) + acttoact_mclk = 4; +#endif wrtord_mclk = picos_to_mclk(common_dimm->tWTR_ps); + /* + * JEDEC has some min requirements for tWTR + */ +#if defined(CONFIG_FSL_DDR2) + if (wrtord_mclk < 2) + wrtord_mclk = 2; +#elif defined(CONFIG_FSL_DDR3) + if (wrtord_mclk < 4) + wrtord_mclk = 4; +#endif + if (popts->OTF_burst_chop_en) + wrtord_mclk += 2; ddr->timing_cfg_1 = (0 | ((pretoact_mclk & 0x0F) << 28) @@ -304,13 +388,25 @@ static void set_timing_cfg_2(fsl_ddr_cfg_regs_t *ddr, #elif defined(CONFIG_FSL_DDR2) wr_lat = cas_latency - 1; #else -#error "Fix WR_LAT for DDR3" + wr_lat = compute_cas_write_latency(); #endif rd_to_pre = picos_to_mclk(common_dimm->tRTP_ps); + /* + * JEDEC has some min requirements for tRTP + */ #if defined(CONFIG_FSL_DDR2) - rd_to_pre += additive_latency; + if (rd_to_pre < 2) + rd_to_pre = 2; +#elif defined(CONFIG_FSL_DDR3) + if (rd_to_pre < 4) + rd_to_pre = 4; #endif + if (additive_latency) + rd_to_pre += additive_latency; + if (popts->OTF_burst_chop_en) + rd_to_pre += 2; /* according to UM */ + wr_data_delay = popts->write_data_delay; cke_pls = picos_to_mclk(popts->tCKE_clock_pulse_width_ps); four_act = picos_to_mclk(popts->tFAW_window_four_activates_ps); @@ -319,8 +415,8 @@ static void set_timing_cfg_2(fsl_ddr_cfg_regs_t *ddr, | ((add_lat_mclk & 0xf) << 28) | ((cpo & 0x1f) << 23) | ((wr_lat & 0xf) << 19) - | ((rd_to_pre & 0x7) << 13) - | ((wr_data_delay & 0x7) << 10) + | ((rd_to_pre & RD_TO_PRE_MASK) << RD_TO_PRE_SHIFT) + | ((wr_data_delay & WR_DATA_DELAY_MASK) << WR_DATA_DELAY_SHIFT) | ((cke_pls & 0x7) << 6) | ((four_act & 0x3f) << 0) ); @@ -366,9 +462,19 @@ static void set_ddr_sdram_cfg(fsl_ddr_cfg_regs_t *ddr, dyn_pwr = popts->dynamic_power; dbw = popts->data_bus_width; - /* DDR3 must use 8-beat bursts when using 32-bit bus mode */ - if ((sdram_type == SDRAM_TYPE_DDR3) && (dbw == 0x1)) - eight_be = 1; + /* 8-beat burst enable DDR-III case + * we must clear it when use the on-the-fly mode, + * must set it when use the 32-bits bus mode. + */ + if (sdram_type == SDRAM_TYPE_DDR3) { + if (popts->burst_length == DDR_BL8) + eight_be = 1; + if (popts->burst_length == DDR_OTF) + eight_be = 0; + if (dbw == 0x1) + eight_be = 1; + } + threeT_en = popts->threeT_en; twoT_en = popts->twoT_en; ba_intlv_ctl = popts->ba_intlv_ctl; @@ -431,8 +537,12 @@ static void set_ddr_sdram_cfg_2(fsl_ddr_cfg_regs_t *ddr, * * ({EXT_REFREC || REFREC} + 8 + 2)]} * << DDR_SDRAM_INTERVAL[REFINT] */ +#if defined(CONFIG_FSL_DDR3) + obc_cfg = popts->OTF_burst_chop_en; +#else + obc_cfg = 0; +#endif - obc_cfg = 0; /* Make this configurable? */ ap_en = 0; /* Make this configurable? */ #if defined(CONFIG_ECC_INIT_VIA_DDRCONTROLLER) @@ -445,6 +555,9 @@ static void set_ddr_sdram_cfg_2(fsl_ddr_cfg_regs_t *ddr, d_init = 0; #endif +#if defined(CONFIG_FSL_DDR3) + md_en = popts->mirrored_dimm; +#endif ddr->ddr_sdram_cfg_2 = (0 | ((frc_sr & 0x1) << 31) | ((sr_ie & 0x1) << 30) @@ -467,6 +580,20 @@ static void set_ddr_sdram_mode_2(fsl_ddr_cfg_regs_t *ddr) unsigned short esdmode2 = 0; /* Extended SDRAM mode 2 */ unsigned short esdmode3 = 0; /* Extended SDRAM mode 3 */ +#if defined(CONFIG_FSL_DDR3) + unsigned int rtt_wr = 2; /* 120 ohm Rtt_WR */ + unsigned int srt = 0; /* self-refresh temerature, normal range */ + unsigned int asr = 0; /* auto self-refresh disable */ + unsigned int cwl = compute_cas_write_latency() - 5; + unsigned int pasr = 0; /* partial array self refresh disable */ + + esdmode2 = (0 + | ((rtt_wr & 0x3) << 9) + | ((srt & 0x1) << 7) + | ((asr & 0x1) << 6) + | ((cwl & 0x7) << 3) + | ((pasr & 0x7) << 0)); +#endif ddr->ddr_sdram_mode_2 = (0 | ((esdmode2 & 0xFFFF) << 16) | ((esdmode3 & 0xFFFF) << 0) @@ -494,6 +621,139 @@ static void set_ddr_sdram_interval(fsl_ddr_cfg_regs_t *ddr, debug("FSLDDR: ddr_sdram_interval = 0x%08x\n", ddr->ddr_sdram_interval); } +#if defined(CONFIG_FSL_DDR3) +/* DDR SDRAM Mode configuration set (DDR_SDRAM_MODE) */ +static void set_ddr_sdram_mode(fsl_ddr_cfg_regs_t *ddr, + const memctl_options_t *popts, + const common_timing_params_t *common_dimm, + unsigned int cas_latency, + unsigned int additive_latency) +{ + unsigned short esdmode; /* Extended SDRAM mode */ + unsigned short sdmode; /* SDRAM mode */ + + /* Mode Register - MR1 */ + unsigned int qoff = 0; /* Output buffer enable 0=yes, 1=no */ + unsigned int tdqs_en = 0; /* TDQS Enable: 0=no, 1=yes */ + unsigned int rtt; + unsigned int wrlvl_en = 0; /* Write level enable: 0=no, 1=yes */ + unsigned int al = 0; /* Posted CAS# additive latency (AL) */ + unsigned int dic = 1; /* Output driver impedance, 34ohm */ + unsigned int dll_en = 0; /* DLL Enable 0=Enable (Normal), + 1=Disable (Test/Debug) */ + + /* Mode Register - MR0 */ + unsigned int dll_on; /* DLL control for precharge PD, 0=off, 1=on */ + unsigned int wr; /* Write Recovery */ + unsigned int dll_rst; /* DLL Reset */ + unsigned int mode; /* Normal=0 or Test=1 */ + unsigned int caslat = 4;/* CAS# latency, default set as 6 cycles */ + /* BT: Burst Type (0=Nibble Sequential, 1=Interleaved) */ + unsigned int bt; + unsigned int bl; /* BL: Burst Length */ + + unsigned int wr_mclk; + + const unsigned int mclk_ps = get_memory_clk_period_ps(); + + rtt = fsl_ddr_get_rtt(); + if (popts->rtt_override) + rtt = popts->rtt_override_value; + + if (additive_latency == (cas_latency - 1)) + al = 1; + if (additive_latency == (cas_latency - 2)) + al = 2; + + /* + * The esdmode value will also be used for writing + * MR1 during write leveling for DDR3, although the + * bits specifically related to the write leveling + * scheme will be handled automatically by the DDR + * controller. so we set the wrlvl_en = 0 here. + */ + esdmode = (0 + | ((qoff & 0x1) << 12) + | ((tdqs_en & 0x1) << 11) + | ((rtt & 0x4) << 9) /* rtt field is split */ + | ((wrlvl_en & 0x1) << 7) + | ((rtt & 0x2) << 6) /* rtt field is split */ + | ((dic & 0x2) << 5) /* DIC field is split */ + | ((al & 0x3) << 3) + | ((rtt & 0x1) << 2) /* rtt field is split */ + | ((dic & 0x1) << 1) /* DIC field is split */ + | ((dll_en & 0x1) << 0) + ); + + /* + * DLL control for precharge PD + * 0=slow exit DLL off (tXPDLL) + * 1=fast exit DLL on (tXP) + */ + dll_on = 1; + wr_mclk = (common_dimm->tWR_ps + mclk_ps - 1) / mclk_ps; + if (wr_mclk >= 12) + wr = 6; + else if (wr_mclk >= 9) + wr = 5; + else + wr = wr_mclk - 4; + dll_rst = 0; /* dll no reset */ + mode = 0; /* normal mode */ + + /* look up table to get the cas latency bits */ + if (cas_latency >= 5 && cas_latency <= 11) { + unsigned char cas_latency_table[7] = { + 0x2, /* 5 clocks */ + 0x4, /* 6 clocks */ + 0x6, /* 7 clocks */ + 0x8, /* 8 clocks */ + 0xa, /* 9 clocks */ + 0xc, /* 10 clocks */ + 0xe /* 11 clocks */ + }; + caslat = cas_latency_table[cas_latency - 5]; + } + bt = 0; /* Nibble sequential */ + + switch (popts->burst_length) { + case DDR_BL8: + bl = 0; + break; + case DDR_OTF: + bl = 1; + break; + case DDR_BC4: + bl = 2; + break; + default: + printf("Error: invalid burst length of %u specified. " + " Defaulting to on-the-fly BC4 or BL8 beats.\n", + popts->burst_length); + bl = 1; + break; + } + + sdmode = (0 + | ((dll_on & 0x1) << 12) + | ((wr & 0x7) << 9) + | ((dll_rst & 0x1) << 8) + | ((mode & 0x1) << 7) + | (((caslat >> 1) & 0x7) << 4) + | ((bt & 0x1) << 3) + | ((bl & 0x3) << 0) + ); + + ddr->ddr_sdram_mode = (0 + | ((esdmode & 0xFFFF) << 16) + | ((sdmode & 0xFFFF) << 0) + ); + + debug("FSLDDR: ddr_sdram_mode = 0x%08x\n", ddr->ddr_sdram_mode); +} + +#else /* !CONFIG_FSL_DDR3 */ + /* DDR SDRAM Mode configuration set (DDR_SDRAM_MODE) */ static void set_ddr_sdram_mode(fsl_ddr_cfg_regs_t *ddr, const memctl_options_t *popts, @@ -570,8 +830,6 @@ static void set_ddr_sdram_mode(fsl_ddr_cfg_regs_t *ddr, wr = 0; /* Historical */ #elif defined(CONFIG_FSL_DDR2) wr = (common_dimm->tWR_ps + mclk_ps - 1) / mclk_ps - 1; -#else -#error "Write tWR_auto for DDR3" #endif dll_res = 0; mode = 0; @@ -590,16 +848,14 @@ static void set_ddr_sdram_mode(fsl_ddr_cfg_regs_t *ddr, } #elif defined(CONFIG_FSL_DDR2) caslat = cas_latency; -#else -#error "Fix the mode CAS Latency for DDR3" #endif bt = 0; switch (popts->burst_length) { - case 4: + case DDR_BL4: bl = 2; break; - case 8: + case DDR_BL8: bl = 3; break; default: @@ -627,7 +883,7 @@ static void set_ddr_sdram_mode(fsl_ddr_cfg_regs_t *ddr, ); debug("FSLDDR: ddr_sdram_mode = 0x%08x\n", ddr->ddr_sdram_mode); } - +#endif /* DDR SDRAM Data Initialization (DDR_DATA_INIT) */ static void set_ddr_data_init(fsl_ddr_cfg_regs_t *ddr) @@ -681,6 +937,12 @@ static void set_timing_cfg_4(fsl_ddr_cfg_regs_t *ddr) unsigned int wwt = 0; /* Write-to-write turnaround for same CS */ unsigned int dll_lock = 0; /* DDR SDRAM DLL Lock Time */ +#if defined(CONFIG_FSL_DDR3) + /* We need set BL/2 + 4 for BC4 or OTF */ + rrt = 4; /* BL/2 + 4 clocks */ + wwt = 4; /* BL/2 + 4 clocks */ + dll_lock = 1; /* tDLLK = 512 clocks from spec */ +#endif ddr->timing_cfg_4 = (0 | ((rwt & 0xf) << 28) | ((wrt & 0xf) << 24) @@ -699,6 +961,13 @@ static void set_timing_cfg_5(fsl_ddr_cfg_regs_t *ddr) unsigned int wodt_on = 0; /* Write to ODT on */ unsigned int wodt_off = 0; /* Write to ODT off */ +#if defined(CONFIG_FSL_DDR3) + rodt_on = 3; /* 2 clocks */ + rodt_off = 4; /* 4 clocks */ + wodt_on = 2; /* 1 clocks */ + wodt_off = 4; /* 4 clocks */ +#endif + ddr->timing_cfg_5 = (0 | ((rodt_on & 0x1f) << 24) | ((rodt_off & 0x7) << 20) @@ -709,15 +978,20 @@ static void set_timing_cfg_5(fsl_ddr_cfg_regs_t *ddr) } /* DDR ZQ Calibration Control (DDR_ZQ_CNTL) */ -static void set_ddr_zq_cntl(fsl_ddr_cfg_regs_t *ddr) +static void set_ddr_zq_cntl(fsl_ddr_cfg_regs_t *ddr, unsigned int zq_en) { - unsigned int zq_en = 0; /* ZQ Calibration Enable */ unsigned int zqinit = 0;/* POR ZQ Calibration Time (tZQinit) */ /* Normal Operation Full Calibration Time (tZQoper) */ unsigned int zqoper = 0; /* Normal Operation Short Calibration Time (tZQCS) */ unsigned int zqcs = 0; + if (zq_en) { + zqinit = 9; /* 512 clocks */ + zqoper = 8; /* 256 clocks */ + zqcs = 6; /* 64 clocks */ + } + ddr->ddr_zq_cntl = (0 | ((zq_en & 0x1) << 31) | ((zqinit & 0xF) << 24) @@ -727,9 +1001,9 @@ static void set_ddr_zq_cntl(fsl_ddr_cfg_regs_t *ddr) } /* DDR Write Leveling Control (DDR_WRLVL_CNTL) */ -static void set_ddr_wrlvl_cntl(fsl_ddr_cfg_regs_t *ddr) +static void set_ddr_wrlvl_cntl(fsl_ddr_cfg_regs_t *ddr, + unsigned int wrlvl_en) { - unsigned int wrlvl_en = 0; /* Write Leveling Enable */ /* * First DQS pulse rising edge after margining mode * is programmed (tWL_MRD) @@ -746,6 +1020,34 @@ static void set_ddr_wrlvl_cntl(fsl_ddr_cfg_regs_t *ddr) /* WRLVL_START: Write leveling start time */ unsigned int wrlvl_start = 0; + /* suggest enable write leveling for DDR3 due to fly-by topology */ + if (wrlvl_en) { + /* tWL_MRD min = 40 nCK, we set it 64 */ + wrlvl_mrd = 0x6; + /* tWL_ODTEN 128 */ + wrlvl_odten = 0x7; + /* tWL_DQSEN min = 25 nCK, we set it 32 */ + wrlvl_dqsen = 0x5; + /* + * Write leveling sample time at least need 14 clocks + * due to tWLO = 9, we set it 15 clocks + */ + wrlvl_smpl = 0xf; + /* + * Write leveling repetition time + * at least tWLO + 6 clocks clocks + * we set it 32 + */ + wrlvl_wlr = 0x5; + /* + * Write leveling start time + * The value use for the DQS_ADJUST for the first sample + * when write leveling is enabled. + * we set it 1 clock delay + */ + wrlvl_start = 0x8; + } + ddr->ddr_wrlvl_cntl = (0 | ((wrlvl_en & 0x1) << 31) | ((wrlvl_mrd & 0x7) << 24) @@ -864,6 +1166,8 @@ compute_fsl_memctl_config_regs(const memctl_options_t *popts, unsigned int cas_latency; unsigned int additive_latency; unsigned int sr_it; + unsigned int zq_en; + unsigned int wrlvl_en; memset(ddr, 0, sizeof(fsl_ddr_cfg_regs_t)); @@ -888,6 +1192,10 @@ compute_fsl_memctl_config_regs(const memctl_options_t *popts, sr_it = (popts->auto_self_refresh_en) ? popts->sr_it : 0; + /* ZQ calibration */ + zq_en = (popts->zq_en) ? 1 : 0; + /* write leveling */ + wrlvl_en = (popts->wrlvl_en) ? 1 : 0; /* Chip Select Memory Bounds (CSn_BNDS) */ for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) { @@ -1022,12 +1330,12 @@ compute_fsl_memctl_config_regs(const memctl_options_t *popts, set_csn_config_2(i, ddr); } -#if defined(CONFIG_FSL_DDR2) +#if !defined(CONFIG_FSL_DDR1) set_timing_cfg_0(ddr); #endif - set_timing_cfg_3(ddr, common_dimm); - set_timing_cfg_1(ddr, common_dimm, cas_latency); + set_timing_cfg_3(ddr, common_dimm, cas_latency); + set_timing_cfg_1(ddr, popts, common_dimm, cas_latency); set_timing_cfg_2(ddr, popts, common_dimm, cas_latency, additive_latency); @@ -1045,8 +1353,8 @@ compute_fsl_memctl_config_regs(const memctl_options_t *popts, set_timing_cfg_4(ddr); set_timing_cfg_5(ddr); - set_ddr_zq_cntl(ddr); - set_ddr_wrlvl_cntl(ddr); + set_ddr_zq_cntl(ddr, zq_en); + set_ddr_wrlvl_cntl(ddr, wrlvl_en); set_ddr_pd_cntl(ddr); set_ddr_sr_cntr(ddr, sr_it); |