drivers/ddr/fsl/fsl_ddr_gen4.c

   1 /*
   2  * Copyright 2014 Freescale Semiconductor, Inc.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <asm/io.h>
   9 #include <fsl_ddr_sdram.h>
  10 #include <asm/processor.h>
  11 #include <fsl_immap.h>
  12 #include <fsl_ddr.h>
  13
  14 #if (CONFIG_CHIP_SELECTS_PER_CTRL > 4)
  15 #error Invalid setting for CONFIG_CHIP_SELECTS_PER_CTRL
  16 #endif
  17
  18 /*
  19  * regs has the to-be-set values for DDR controller registers
  20  * ctrl_num is the DDR controller number
  21  * step: 0 goes through the initialization in one pass
  22  *       1 sets registers and returns before enabling controller
  23  *       2 resumes from step 1 and continues to initialize
  24  * Dividing the initialization to two steps to deassert DDR reset signal
  25  * to comply with JEDEC specs for RDIMMs.
  26  */
  27 void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
  28                              unsigned int ctrl_num, int step)
  29 {
  30         unsigned int i, bus_width;
  31         struct ccsr_ddr __iomem *ddr;
  32         u32 temp_sdram_cfg;
  33         u32 total_gb_size_per_controller;
  34         int timeout;
  35
  36         switch (ctrl_num) {
  37         case 0:
  38                 ddr = (void *)CONFIG_SYS_FSL_DDR_ADDR;
  39                 break;
  40 #if defined(CONFIG_SYS_FSL_DDR2_ADDR) && (CONFIG_NUM_DDR_CONTROLLERS > 1)
  41         case 1:
  42                 ddr = (void *)CONFIG_SYS_FSL_DDR2_ADDR;
  43                 break;
  44 #endif
  45 #if defined(CONFIG_SYS_FSL_DDR3_ADDR) && (CONFIG_NUM_DDR_CONTROLLERS > 2)
  46         case 2:
  47                 ddr = (void *)CONFIG_SYS_FSL_DDR3_ADDR;
  48                 break;
  49 #endif
  50 #if defined(CONFIG_SYS_FSL_DDR4_ADDR) && (CONFIG_NUM_DDR_CONTROLLERS > 3)
  51         case 3:
  52                 ddr = (void *)CONFIG_SYS_FSL_DDR4_ADDR;
  53                 break;
  54 #endif
  55         default:
  56                 printf("%s unexpected ctrl_num = %u\n", __func__, ctrl_num);
  57                 return;
  58         }
  59
  60         if (step == 2)
  61                 goto step2;
  62
  63         if (regs->ddr_eor)
  64                 ddr_out32(&ddr->eor, regs->ddr_eor);
  65
  66         ddr_out32(&ddr->sdram_clk_cntl, regs->ddr_sdram_clk_cntl);
  67
  68         for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
  69                 if (i == 0) {
  70                         ddr_out32(&ddr->cs0_bnds, regs->cs[i].bnds);
  71                         ddr_out32(&ddr->cs0_config, regs->cs[i].config);
  72                         ddr_out32(&ddr->cs0_config_2, regs->cs[i].config_2);
  73
  74                 } else if (i == 1) {
  75                         ddr_out32(&ddr->cs1_bnds, regs->cs[i].bnds);
  76                         ddr_out32(&ddr->cs1_config, regs->cs[i].config);
  77                         ddr_out32(&ddr->cs1_config_2, regs->cs[i].config_2);
  78
  79                 } else if (i == 2) {
  80                         ddr_out32(&ddr->cs2_bnds, regs->cs[i].bnds);
  81                         ddr_out32(&ddr->cs2_config, regs->cs[i].config);
  82                         ddr_out32(&ddr->cs2_config_2, regs->cs[i].config_2);
  83
  84                 } else if (i == 3) {
  85                         ddr_out32(&ddr->cs3_bnds, regs->cs[i].bnds);
  86                         ddr_out32(&ddr->cs3_config, regs->cs[i].config);
  87                         ddr_out32(&ddr->cs3_config_2, regs->cs[i].config_2);
  88                 }
  89         }
  90
  91         ddr_out32(&ddr->timing_cfg_3, regs->timing_cfg_3);
  92         ddr_out32(&ddr->timing_cfg_0, regs->timing_cfg_0);
  93         ddr_out32(&ddr->timing_cfg_1, regs->timing_cfg_1);
  94         ddr_out32(&ddr->timing_cfg_2, regs->timing_cfg_2);
  95         ddr_out32(&ddr->timing_cfg_4, regs->timing_cfg_4);
  96         ddr_out32(&ddr->timing_cfg_5, regs->timing_cfg_5);
  97         ddr_out32(&ddr->timing_cfg_6, regs->timing_cfg_6);
  98         ddr_out32(&ddr->timing_cfg_7, regs->timing_cfg_7);
  99         ddr_out32(&ddr->timing_cfg_8, regs->timing_cfg_8);
 100         ddr_out32(&ddr->timing_cfg_9, regs->timing_cfg_9);
 101         ddr_out32(&ddr->ddr_zq_cntl, regs->ddr_zq_cntl);
 102         ddr_out32(&ddr->dq_map_0, regs->dq_map_0);
 103         ddr_out32(&ddr->dq_map_1, regs->dq_map_1);
 104         ddr_out32(&ddr->dq_map_2, regs->dq_map_2);
 105         ddr_out32(&ddr->dq_map_3, regs->dq_map_3);
 106         ddr_out32(&ddr->sdram_cfg_2, regs->ddr_sdram_cfg_2);
 107         ddr_out32(&ddr->sdram_cfg_3, regs->ddr_sdram_cfg_3);
 108         ddr_out32(&ddr->sdram_mode, regs->ddr_sdram_mode);
 109         ddr_out32(&ddr->sdram_mode_2, regs->ddr_sdram_mode_2);
 110         ddr_out32(&ddr->sdram_mode_3, regs->ddr_sdram_mode_3);
 111         ddr_out32(&ddr->sdram_mode_4, regs->ddr_sdram_mode_4);
 112         ddr_out32(&ddr->sdram_mode_5, regs->ddr_sdram_mode_5);
 113         ddr_out32(&ddr->sdram_mode_6, regs->ddr_sdram_mode_6);
 114         ddr_out32(&ddr->sdram_mode_7, regs->ddr_sdram_mode_7);
 115         ddr_out32(&ddr->sdram_mode_8, regs->ddr_sdram_mode_8);
 116         ddr_out32(&ddr->sdram_mode_9, regs->ddr_sdram_mode_9);
 117         ddr_out32(&ddr->sdram_mode_10, regs->ddr_sdram_mode_10);
 118         ddr_out32(&ddr->sdram_mode_11, regs->ddr_sdram_mode_11);
 119         ddr_out32(&ddr->sdram_mode_12, regs->ddr_sdram_mode_12);
 120         ddr_out32(&ddr->sdram_mode_13, regs->ddr_sdram_mode_13);
 121         ddr_out32(&ddr->sdram_mode_14, regs->ddr_sdram_mode_14);
 122         ddr_out32(&ddr->sdram_mode_15, regs->ddr_sdram_mode_15);
 123         ddr_out32(&ddr->sdram_mode_16, regs->ddr_sdram_mode_16);
 124         ddr_out32(&ddr->sdram_md_cntl, regs->ddr_sdram_md_cntl);
 125         ddr_out32(&ddr->sdram_interval, regs->ddr_sdram_interval);
 126         ddr_out32(&ddr->sdram_data_init, regs->ddr_data_init);
 127         ddr_out32(&ddr->init_addr, regs->ddr_init_addr);
 128         ddr_out32(&ddr->init_ext_addr, regs->ddr_init_ext_addr);
 129         ddr_out32(&ddr->ddr_wrlvl_cntl, regs->ddr_wrlvl_cntl);
 130 #ifndef CONFIG_SYS_FSL_DDR_EMU
 131         /*
 132          * Skip these two registers if running on emulator
 133          * because emulator doesn't have skew between bytes.
 134          */
 135
 136         if (regs->ddr_wrlvl_cntl_2)
 137                 ddr_out32(&ddr->ddr_wrlvl_cntl_2, regs->ddr_wrlvl_cntl_2);
 138         if (regs->ddr_wrlvl_cntl_3)
 139                 ddr_out32(&ddr->ddr_wrlvl_cntl_3, regs->ddr_wrlvl_cntl_3);
 140 #endif
 141
 142         ddr_out32(&ddr->ddr_sr_cntr, regs->ddr_sr_cntr);
 143         ddr_out32(&ddr->ddr_sdram_rcw_1, regs->ddr_sdram_rcw_1);
 144         ddr_out32(&ddr->ddr_sdram_rcw_2, regs->ddr_sdram_rcw_2);
 145         ddr_out32(&ddr->ddr_sdram_rcw_3, regs->ddr_sdram_rcw_3);
 146         ddr_out32(&ddr->ddr_sdram_rcw_4, regs->ddr_sdram_rcw_4);
 147         ddr_out32(&ddr->ddr_sdram_rcw_5, regs->ddr_sdram_rcw_5);
 148         ddr_out32(&ddr->ddr_sdram_rcw_6, regs->ddr_sdram_rcw_6);
 149         ddr_out32(&ddr->ddr_cdr1, regs->ddr_cdr1);
 150         ddr_out32(&ddr->ddr_cdr2, regs->ddr_cdr2);
 151         ddr_out32(&ddr->err_disable, regs->err_disable);
 152         ddr_out32(&ddr->err_int_en, regs->err_int_en);
 153         for (i = 0; i < 32; i++) {
 154                 if (regs->debug[i]) {
 155                         debug("Write to debug_%d as %08x\n",
 156                               i+1, regs->debug[i]);
 157                         ddr_out32(&ddr->debug[i], regs->debug[i]);
 158                 }
 159         }
 160
 161         /*
 162          * For RDIMMs, JEDEC spec requires clocks to be stable before reset is
 163          * deasserted. Clocks start when any chip select is enabled and clock
 164          * control register is set. Because all DDR components are connected to
 165          * one reset signal, this needs to be done in two steps. Step 1 is to
 166          * get the clocks started. Step 2 resumes after reset signal is
 167          * deasserted.
 168          */
 169         if (step == 1) {
 170                 udelay(200);
 171                 return;
 172         }
 173
 174 step2:
 175         /* Set, but do not enable the memory */
 176         temp_sdram_cfg = regs->ddr_sdram_cfg;
 177         temp_sdram_cfg &= ~(SDRAM_CFG_MEM_EN);
 178         ddr_out32(&ddr->sdram_cfg, temp_sdram_cfg);
 179
 180         /*
 181          * 500 painful micro-seconds must elapse between
 182          * the DDR clock setup and the DDR config enable.
 183          * DDR2 need 200 us, and DDR3 need 500 us from spec,
 184          * we choose the max, that is 500 us for all of case.
 185          */
 186         udelay(500);
 187         mb();
 188         isb();
 189
 190         /* Let the controller go */
 191         temp_sdram_cfg = ddr_in32(&ddr->sdram_cfg) & ~SDRAM_CFG_BI;
 192         ddr_out32(&ddr->sdram_cfg, temp_sdram_cfg | SDRAM_CFG_MEM_EN);
 193         mb();
 194         isb();
 195
 196         total_gb_size_per_controller = 0;
 197         for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
 198                 if (!(regs->cs[i].config & 0x80000000))
 199                         continue;
 200                 total_gb_size_per_controller += 1 << (
 201                         ((regs->cs[i].config >> 14) & 0x3) + 2 +
 202                         ((regs->cs[i].config >> 8) & 0x7) + 12 +
 203                         ((regs->cs[i].config >> 4) & 0x3) + 0 +
 204                         ((regs->cs[i].config >> 0) & 0x7) + 8 +
 205                         3 - ((regs->ddr_sdram_cfg >> 19) & 0x3) -
 206                         26);                    /* minus 26 (count of 64M) */
 207         }
 208         if (fsl_ddr_get_intl3r() & 0x80000000)  /* 3-way interleaving */
 209                 total_gb_size_per_controller *= 3;
 210         else if (regs->cs[0].config & 0x20000000) /* 2-way interleaving */
 211                 total_gb_size_per_controller <<= 1;
 212         /*
 213          * total memory / bus width = transactions needed
 214          * transactions needed / data rate = seconds
 215          * to add plenty of buffer, double the time
 216          * For example, 2GB on 666MT/s 64-bit bus takes about 402ms
 217          * Let's wait for 800ms
 218          */
 219         bus_width = 3 - ((ddr_in32(&ddr->sdram_cfg) & SDRAM_CFG_DBW_MASK)
 220                         >> SDRAM_CFG_DBW_SHIFT);
 221         timeout = ((total_gb_size_per_controller << (6 - bus_width)) * 100 /
 222                 (get_ddr_freq(0) >> 20)) << 2;
 223         total_gb_size_per_controller >>= 4;     /* shift down to gb size */
 224         debug("total %d GB\n", total_gb_size_per_controller);
 225         debug("Need to wait up to %d * 10ms\n", timeout);
 226
 227         /* Poll DDR_SDRAM_CFG_2[D_INIT] bit until auto-data init is done.  */
 228         while ((ddr_in32(&ddr->sdram_cfg_2) & SDRAM_CFG2_D_INIT) &&
 229                 (timeout >= 0)) {
 230                 udelay(10000);          /* throttle polling rate */
 231                 timeout--;
 232         }
 233
 234         if (timeout <= 0)
 235                 printf("Waiting for D_INIT timeout. Memory may not work.\n");
 236 }