arch/arm/mach-omap2/am33xx/ddr.c

   1 /*
   2  * DDR Configuration for AM33xx devices.
   3  *
   4  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <asm/arch/cpu.h>
  10 #include <asm/arch/ddr_defs.h>
  11 #include <asm/arch/sys_proto.h>
  12 #include <asm/io.h>
  13 #include <asm/emif.h>
  14
  15 /**
  16  * Base address for EMIF instances
  17  */
  18 static struct emif_reg_struct *emif_reg[2] = {
  19                                 (struct emif_reg_struct *)EMIF4_0_CFG_BASE,
  20                                 (struct emif_reg_struct *)EMIF4_1_CFG_BASE};
  21
  22 /**
  23  * Base addresses for DDR PHY cmd/data regs
  24  */
  25 static struct ddr_cmd_regs *ddr_cmd_reg[2] = {
  26                                 (struct ddr_cmd_regs *)DDR_PHY_CMD_ADDR,
  27                                 (struct ddr_cmd_regs *)DDR_PHY_CMD_ADDR2};
  28
  29 static struct ddr_data_regs *ddr_data_reg[2] = {
  30                                 (struct ddr_data_regs *)DDR_PHY_DATA_ADDR,
  31                                 (struct ddr_data_regs *)DDR_PHY_DATA_ADDR2};
  32
  33 /**
  34  * Base address for ddr io control instances
  35  */
  36 static struct ddr_cmdtctrl *ioctrl_reg = {
  37                         (struct ddr_cmdtctrl *)DDR_CONTROL_BASE_ADDR};
  38
  39 static inline u32 get_mr(int nr, u32 cs, u32 mr_addr)
  40 {
  41         u32 mr;
  42
  43         mr_addr |= cs << EMIF_REG_CS_SHIFT;
  44         writel(mr_addr, &emif_reg[nr]->emif_lpddr2_mode_reg_cfg);
  45
  46         mr = readl(&emif_reg[nr]->emif_lpddr2_mode_reg_data);
  47         debug("get_mr: EMIF1 cs %d mr %08x val 0x%x\n", cs, mr_addr, mr);
  48         if (((mr & 0x0000ff00) >>  8) == (mr & 0xff) &&
  49             ((mr & 0x00ff0000) >> 16) == (mr & 0xff) &&
  50             ((mr & 0xff000000) >> 24) == (mr & 0xff))
  51                 return mr & 0xff;
  52         else
  53                 return mr;
  54 }
  55
  56 static inline void set_mr(int nr, u32 cs, u32 mr_addr, u32 mr_val)
  57 {
  58         mr_addr |= cs << EMIF_REG_CS_SHIFT;
  59         writel(mr_addr, &emif_reg[nr]->emif_lpddr2_mode_reg_cfg);
  60         writel(mr_val, &emif_reg[nr]->emif_lpddr2_mode_reg_data);
  61 }
  62
  63 static void configure_mr(int nr, u32 cs)
  64 {
  65         u32 mr_addr;
  66
  67         while (get_mr(nr, cs, LPDDR2_MR0) & LPDDR2_MR0_DAI_MASK)
  68                 ;
  69         set_mr(nr, cs, LPDDR2_MR10, 0x56);
  70
  71         set_mr(nr, cs, LPDDR2_MR1, 0x43);
  72         set_mr(nr, cs, LPDDR2_MR2, 0x2);
  73
  74         mr_addr = LPDDR2_MR2 | EMIF_REG_REFRESH_EN_MASK;
  75         set_mr(nr, cs, mr_addr, 0x2);
  76 }
  77
  78 /*
  79  * Configure EMIF4D5 registers and MR registers For details about these magic
  80  * values please see the EMIF registers section of the TRM.
  81  */
  82 void config_sdram_emif4d5(const struct emif_regs *regs, int nr)
  83 {
  84         writel(0xA0, &emif_reg[nr]->emif_pwr_mgmt_ctrl);
  85         writel(0xA0, &emif_reg[nr]->emif_pwr_mgmt_ctrl_shdw);
  86         writel(regs->zq_config, &emif_reg[nr]->emif_zq_config);
  87
  88         writel(regs->temp_alert_config, &emif_reg[nr]->emif_temp_alert_config);
  89         writel(regs->emif_rd_wr_lvl_rmp_win,
  90                &emif_reg[nr]->emif_rd_wr_lvl_rmp_win);
  91         writel(regs->emif_rd_wr_lvl_rmp_ctl,
  92                &emif_reg[nr]->emif_rd_wr_lvl_rmp_ctl);
  93         writel(regs->emif_rd_wr_lvl_ctl, &emif_reg[nr]->emif_rd_wr_lvl_ctl);
  94         writel(regs->emif_rd_wr_exec_thresh,
  95                &emif_reg[nr]->emif_rd_wr_exec_thresh);
  96
  97         /*
  98          * for most SOCs these registers won't need to be changed so only
  99          * write to these registers if someone explicitly has set the
 100          * register's value.
 101          */
 102         if(regs->emif_cos_config) {
 103                 writel(regs->emif_prio_class_serv_map, &emif_reg[nr]->emif_prio_class_serv_map);
 104                 writel(regs->emif_connect_id_serv_1_map, &emif_reg[nr]->emif_connect_id_serv_1_map);
 105                 writel(regs->emif_connect_id_serv_2_map, &emif_reg[nr]->emif_connect_id_serv_2_map);
 106                 writel(regs->emif_cos_config, &emif_reg[nr]->emif_cos_config);
 107         }
 108
 109         /*
 110          * Sequence to ensure that the PHY is in a known state prior to
 111          * startting hardware leveling.  Also acts as to latch some state from
 112          * the EMIF into the PHY.
 113          */
 114         writel(0x2011, &emif_reg[nr]->emif_iodft_tlgc);
 115         writel(0x2411, &emif_reg[nr]->emif_iodft_tlgc);
 116         writel(0x2011, &emif_reg[nr]->emif_iodft_tlgc);
 117
 118         clrbits_le32(&emif_reg[nr]->emif_sdram_ref_ctrl,
 119                         EMIF_REG_INITREF_DIS_MASK);
 120
 121         writel(regs->sdram_config, &emif_reg[nr]->emif_sdram_config);
 122         writel(regs->sdram_config, &cstat->secure_emif_sdram_config);
 123
 124         /* Wait 1ms because of L3 timeout error */
 125         udelay(1000);
 126
 127         writel(regs->ref_ctrl, &emif_reg[nr]->emif_sdram_ref_ctrl);
 128         writel(regs->ref_ctrl, &emif_reg[nr]->emif_sdram_ref_ctrl_shdw);
 129
 130         /* Perform hardware leveling for DDR3 */
 131         if (emif_sdram_type(regs->sdram_config) == EMIF_SDRAM_TYPE_DDR3) {
 132                 writel(readl(&emif_reg[nr]->emif_ddr_ext_phy_ctrl_36) |
 133                        0x100, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_36);
 134                 writel(readl(&emif_reg[nr]->emif_ddr_ext_phy_ctrl_36_shdw) |
 135                        0x100, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_36_shdw);
 136
 137                 writel(0x80000000, &emif_reg[nr]->emif_rd_wr_lvl_rmp_ctl);
 138
 139                 /* Enable read leveling */
 140                 writel(0x80000000, &emif_reg[nr]->emif_rd_wr_lvl_ctl);
 141
 142                 /*
 143                  * Enable full read and write leveling.  Wait for read and write
 144                  * leveling bit to clear RDWRLVLFULL_START bit 31
 145                  */
 146                 while ((readl(&emif_reg[nr]->emif_rd_wr_lvl_ctl) & 0x80000000)
 147                       != 0)
 148                         ;
 149
 150                 /* Check the timeout register to see if leveling is complete */
 151                 if ((readl(&emif_reg[nr]->emif_status) & 0x70) != 0)
 152                         puts("DDR3 H/W leveling incomplete with errors\n");
 153
 154         } else {
 155                 /* DDR2 */
 156                 configure_mr(nr, 0);
 157                 configure_mr(nr, 1);
 158         }
 159 }
 160
 161 /**
 162  * Configure SDRAM
 163  */
 164 void config_sdram(const struct emif_regs *regs, int nr)
 165 {
 166         if (regs->zq_config) {
 167                 writel(regs->zq_config, &emif_reg[nr]->emif_zq_config);
 168                 writel(regs->sdram_config, &cstat->secure_emif_sdram_config);
 169                 writel(regs->sdram_config, &emif_reg[nr]->emif_sdram_config);
 170
 171                 /* Trigger initialization */
 172                 writel(0x00003100, &emif_reg[nr]->emif_sdram_ref_ctrl);
 173                 /* Wait 1ms because of L3 timeout error */
 174                 udelay(1000);
 175
 176                 /* Write proper sdram_ref_cref_ctrl value */
 177                 writel(regs->ref_ctrl, &emif_reg[nr]->emif_sdram_ref_ctrl);
 178                 writel(regs->ref_ctrl, &emif_reg[nr]->emif_sdram_ref_ctrl_shdw);
 179         }
 180         writel(regs->ref_ctrl, &emif_reg[nr]->emif_sdram_ref_ctrl);
 181         writel(regs->ref_ctrl, &emif_reg[nr]->emif_sdram_ref_ctrl_shdw);
 182         writel(regs->sdram_config, &emif_reg[nr]->emif_sdram_config);
 183
 184         /* Write REG_COS_COUNT_1, REG_COS_COUNT_2, and REG_PR_OLD_COUNT. */
 185         if (regs->ocp_config)
 186                 writel(regs->ocp_config, &emif_reg[nr]->emif_l3_config);
 187 }
 188
 189 /**
 190  * Set SDRAM timings
 191  */
 192 void set_sdram_timings(const struct emif_regs *regs, int nr)
 193 {
 194         writel(regs->sdram_tim1, &emif_reg[nr]->emif_sdram_tim_1);
 195         writel(regs->sdram_tim1, &emif_reg[nr]->emif_sdram_tim_1_shdw);
 196         writel(regs->sdram_tim2, &emif_reg[nr]->emif_sdram_tim_2);
 197         writel(regs->sdram_tim2, &emif_reg[nr]->emif_sdram_tim_2_shdw);
 198         writel(regs->sdram_tim3, &emif_reg[nr]->emif_sdram_tim_3);
 199         writel(regs->sdram_tim3, &emif_reg[nr]->emif_sdram_tim_3_shdw);
 200 }
 201
 202 /*
 203  * Configure EXT PHY registers for software leveling
 204  */
 205 static void ext_phy_settings_swlvl(const struct emif_regs *regs, int nr)
 206 {
 207         u32 *ext_phy_ctrl_base = 0;
 208         u32 *emif_ext_phy_ctrl_base = 0;
 209         __maybe_unused const u32 *ext_phy_ctrl_const_regs;
 210         u32 i = 0;
 211         __maybe_unused u32 size;
 212
 213         ext_phy_ctrl_base = (u32 *)&(regs->emif_ddr_ext_phy_ctrl_1);
 214         emif_ext_phy_ctrl_base =
 215                         (u32 *)&(emif_reg[nr]->emif_ddr_ext_phy_ctrl_1);
 216
 217         /* Configure external phy control timing registers */
 218         for (i = 0; i < EMIF_EXT_PHY_CTRL_TIMING_REG; i++) {
 219                 writel(*ext_phy_ctrl_base, emif_ext_phy_ctrl_base++);
 220                 /* Update shadow registers */
 221                 writel(*ext_phy_ctrl_base++, emif_ext_phy_ctrl_base++);
 222         }
 223
 224 #ifdef CONFIG_AM43XX
 225         /*
 226          * External phy 6-24 registers do not change with ddr frequency.
 227          * These only need to be set on DDR2 on AM43xx.
 228          */
 229         emif_get_ext_phy_ctrl_const_regs(&ext_phy_ctrl_const_regs, &size);
 230
 231         if (!size)
 232                 return;
 233
 234         for (i = 0; i < size; i++) {
 235                 writel(ext_phy_ctrl_const_regs[i], emif_ext_phy_ctrl_base++);
 236                 /* Update shadow registers */
 237                 writel(ext_phy_ctrl_const_regs[i], emif_ext_phy_ctrl_base++);
 238         }
 239 #endif
 240 }
 241
 242 /*
 243  * Configure EXT PHY registers for hardware leveling
 244  */
 245 static void ext_phy_settings_hwlvl(const struct emif_regs *regs, int nr)
 246 {
 247         /*
 248          * Enable hardware leveling on the EMIF.  For details about these
 249          * magic values please see the EMIF registers section of the TRM.
 250          */
 251         writel(0x08020080, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_1);
 252         writel(0x08020080, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_1_shdw);
 253         writel(0x00000000, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_22);
 254         writel(0x00000000, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_22_shdw);
 255         writel(0x00600020, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_23);
 256         writel(0x00600020, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_23_shdw);
 257         writel(0x40010080, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_24);
 258         writel(0x40010080, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_24_shdw);
 259         writel(0x08102040, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_25);
 260         writel(0x08102040, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_25_shdw);
 261         writel(0x00200020, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_26);
 262         writel(0x00200020, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_26_shdw);
 263         writel(0x00200020, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_27);
 264         writel(0x00200020, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_27_shdw);
 265         writel(0x00200020, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_28);
 266         writel(0x00200020, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_28_shdw);
 267         writel(0x00200020, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_29);
 268         writel(0x00200020, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_29_shdw);
 269         writel(0x00200020, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_30);
 270         writel(0x00200020, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_30_shdw);
 271         writel(0x00000000, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_31);
 272         writel(0x00000000, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_31_shdw);
 273         writel(0x00000000, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_32);
 274         writel(0x00000000, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_32_shdw);
 275         writel(0x00000000, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_33);
 276         writel(0x00000000, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_33_shdw);
 277         writel(0x00000000, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_34);
 278         writel(0x00000000, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_34_shdw);
 279         writel(0x00000000, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_35);
 280         writel(0x00000000, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_35_shdw);
 281         writel(0x000000FF, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_36);
 282         writel(0x000000FF, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_36_shdw);
 283
 284         /*
 285          * Sequence to ensure that the PHY is again in a known state after
 286          * hardware leveling.
 287          */
 288         writel(0x2011, &emif_reg[nr]->emif_iodft_tlgc);
 289         writel(0x2411, &emif_reg[nr]->emif_iodft_tlgc);
 290         writel(0x2011, &emif_reg[nr]->emif_iodft_tlgc);
 291 }
 292
 293 /**
 294  * Configure DDR PHY
 295  */
 296 void config_ddr_phy(const struct emif_regs *regs, int nr)
 297 {
 298         /*
 299          * Disable initialization and refreshes for now until we finish
 300          * programming EMIF regs and set time between rising edge of
 301          * DDR_RESET to rising edge of DDR_CKE to > 500us per memory spec.
 302          * We currently hardcode a value based on a max expected frequency
 303          * of 400MHz.
 304          */
 305         writel(EMIF_REG_INITREF_DIS_MASK | 0x3100,
 306                 &emif_reg[nr]->emif_sdram_ref_ctrl);
 307
 308         writel(regs->emif_ddr_phy_ctlr_1,
 309                 &emif_reg[nr]->emif_ddr_phy_ctrl_1);
 310         writel(regs->emif_ddr_phy_ctlr_1,
 311                 &emif_reg[nr]->emif_ddr_phy_ctrl_1_shdw);
 312
 313         if (get_emif_rev((u32)emif_reg[nr]) == EMIF_4D5) {
 314                 if (emif_sdram_type(regs->sdram_config) == EMIF_SDRAM_TYPE_DDR3)
 315                         ext_phy_settings_hwlvl(regs, nr);
 316                 else
 317                         ext_phy_settings_swlvl(regs, nr);
 318         }
 319 }
 320
 321 /**
 322  * Configure DDR CMD control registers
 323  */
 324 void config_cmd_ctrl(const struct cmd_control *cmd, int nr)
 325 {
 326         if (!cmd)
 327                 return;
 328
 329         writel(cmd->cmd0csratio, &ddr_cmd_reg[nr]->cm0csratio);
 330         writel(cmd->cmd0iclkout, &ddr_cmd_reg[nr]->cm0iclkout);
 331
 332         writel(cmd->cmd1csratio, &ddr_cmd_reg[nr]->cm1csratio);
 333         writel(cmd->cmd1iclkout, &ddr_cmd_reg[nr]->cm1iclkout);
 334
 335         writel(cmd->cmd2csratio, &ddr_cmd_reg[nr]->cm2csratio);
 336         writel(cmd->cmd2iclkout, &ddr_cmd_reg[nr]->cm2iclkout);
 337 }
 338
 339 /**
 340  * Configure DDR DATA registers
 341  */
 342 void config_ddr_data(const struct ddr_data *data, int nr)
 343 {
 344         int i;
 345
 346         if (!data)
 347                 return;
 348
 349         for (i = 0; i < DDR_DATA_REGS_NR; i++) {
 350                 writel(data->datardsratio0,
 351                         &(ddr_data_reg[nr]+i)->dt0rdsratio0);
 352                 writel(data->datawdsratio0,
 353                         &(ddr_data_reg[nr]+i)->dt0wdsratio0);
 354                 writel(data->datawiratio0,
 355                         &(ddr_data_reg[nr]+i)->dt0wiratio0);
 356                 writel(data->datagiratio0,
 357                         &(ddr_data_reg[nr]+i)->dt0giratio0);
 358                 writel(data->datafwsratio0,
 359                         &(ddr_data_reg[nr]+i)->dt0fwsratio0);
 360                 writel(data->datawrsratio0,
 361                         &(ddr_data_reg[nr]+i)->dt0wrsratio0);
 362         }
 363 }
 364
 365 void config_io_ctrl(const struct ctrl_ioregs *ioregs)
 366 {
 367         if (!ioregs)
 368                 return;
 369
 370         writel(ioregs->cm0ioctl, &ioctrl_reg->cm0ioctl);
 371         writel(ioregs->cm1ioctl, &ioctrl_reg->cm1ioctl);
 372         writel(ioregs->cm2ioctl, &ioctrl_reg->cm2ioctl);
 373         writel(ioregs->dt0ioctl, &ioctrl_reg->dt0ioctl);
 374         writel(ioregs->dt1ioctl, &ioctrl_reg->dt1ioctl);
 375 #ifdef CONFIG_AM43XX
 376         writel(ioregs->dt2ioctrl, &ioctrl_reg->dt2ioctrl);
 377         writel(ioregs->dt3ioctrl, &ioctrl_reg->dt3ioctrl);
 378         writel(ioregs->emif_sdram_config_ext,
 379                &ioctrl_reg->emif_sdram_config_ext);
 380 #endif
 381 }