drivers/ddr/fsl/arm_ddr_gen3.c

   1 /*
   2  * Copyright 2013 Freescale Semiconductor, Inc.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  *
   6  * Derived from mpc85xx_ddr_gen3.c, removed all workarounds
   7  */
   8
   9 #include <common.h>
  10 #include <asm/io.h>
  11 #include <fsl_ddr_sdram.h>
  12 #include <asm/processor.h>
  13 #include <fsl_immap.h>
  14 #include <fsl_ddr.h>
  15
  16 #if (CONFIG_CHIP_SELECTS_PER_CTRL > 4)
  17 #error Invalid setting for CONFIG_CHIP_SELECTS_PER_CTRL
  18 #endif
  19
  20
  21 /*
  22  * regs has the to-be-set values for DDR controller registers
  23  * ctrl_num is the DDR controller number
  24  * step: 0 goes through the initialization in one pass
  25  *       1 sets registers and returns before enabling controller
  26  *       2 resumes from step 1 and continues to initialize
  27  * Dividing the initialization to two steps to deassert DDR reset signal
  28  * to comply with JEDEC specs for RDIMMs.
  29  */
  30 void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
  31                              unsigned int ctrl_num, int step)
  32 {
  33         unsigned int i, bus_width;
  34         struct ccsr_ddr __iomem *ddr;
  35         u32 temp_sdram_cfg;
  36         u32 total_gb_size_per_controller;
  37         int timeout;
  38
  39         switch (ctrl_num) {
  40         case 0:
  41                 ddr = (void *)CONFIG_SYS_FSL_DDR_ADDR;
  42                 break;
  43 #if defined(CONFIG_SYS_FSL_DDR2_ADDR) && (CONFIG_SYS_NUM_DDR_CTLRS > 1)
  44         case 1:
  45                 ddr = (void *)CONFIG_SYS_FSL_DDR2_ADDR;
  46                 break;
  47 #endif
  48 #if defined(CONFIG_SYS_FSL_DDR3_ADDR) && (CONFIG_SYS_NUM_DDR_CTLRS > 2)
  49         case 2:
  50                 ddr = (void *)CONFIG_SYS_FSL_DDR3_ADDR;
  51                 break;
  52 #endif
  53 #if defined(CONFIG_SYS_FSL_DDR4_ADDR) && (CONFIG_SYS_NUM_DDR_CTLRS > 3)
  54         case 3:
  55                 ddr = (void *)CONFIG_SYS_FSL_DDR4_ADDR;
  56                 break;
  57 #endif
  58         default:
  59                 printf("%s unexpected ctrl_num = %u\n", __func__, ctrl_num);
  60                 return;
  61         }
  62
  63         if (step == 2)
  64                 goto step2;
  65
  66         if (regs->ddr_eor)
  67                 ddr_out32(&ddr->eor, regs->ddr_eor);
  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->sdram_mode, regs->ddr_sdram_mode);
  96         ddr_out32(&ddr->sdram_mode_2, regs->ddr_sdram_mode_2);
  97         ddr_out32(&ddr->sdram_mode_3, regs->ddr_sdram_mode_3);
  98         ddr_out32(&ddr->sdram_mode_4, regs->ddr_sdram_mode_4);
  99         ddr_out32(&ddr->sdram_mode_5, regs->ddr_sdram_mode_5);
 100         ddr_out32(&ddr->sdram_mode_6, regs->ddr_sdram_mode_6);
 101         ddr_out32(&ddr->sdram_mode_7, regs->ddr_sdram_mode_7);
 102         ddr_out32(&ddr->sdram_mode_8, regs->ddr_sdram_mode_8);
 103         ddr_out32(&ddr->sdram_md_cntl, regs->ddr_sdram_md_cntl);
 104         ddr_out32(&ddr->sdram_interval, regs->ddr_sdram_interval);
 105         ddr_out32(&ddr->sdram_data_init, regs->ddr_data_init);
 106         ddr_out32(&ddr->sdram_clk_cntl, regs->ddr_sdram_clk_cntl);
 107         ddr_out32(&ddr->timing_cfg_4, regs->timing_cfg_4);
 108         ddr_out32(&ddr->timing_cfg_5, regs->timing_cfg_5);
 109         ddr_out32(&ddr->ddr_zq_cntl, regs->ddr_zq_cntl);
 110         ddr_out32(&ddr->ddr_wrlvl_cntl, regs->ddr_wrlvl_cntl);
 111 #ifndef CONFIG_SYS_FSL_DDR_EMU
 112         /*
 113          * Skip these two registers if running on emulator
 114          * because emulator doesn't have skew between bytes.
 115          */
 116
 117         if (regs->ddr_wrlvl_cntl_2)
 118                 ddr_out32(&ddr->ddr_wrlvl_cntl_2, regs->ddr_wrlvl_cntl_2);
 119         if (regs->ddr_wrlvl_cntl_3)
 120                 ddr_out32(&ddr->ddr_wrlvl_cntl_3, regs->ddr_wrlvl_cntl_3);
 121 #endif
 122
 123         ddr_out32(&ddr->ddr_sr_cntr, regs->ddr_sr_cntr);
 124         ddr_out32(&ddr->ddr_sdram_rcw_1, regs->ddr_sdram_rcw_1);
 125         ddr_out32(&ddr->ddr_sdram_rcw_2, regs->ddr_sdram_rcw_2);
 126         ddr_out32(&ddr->ddr_cdr1, regs->ddr_cdr1);
 127 #ifdef CONFIG_DEEP_SLEEP
 128         if (is_warm_boot()) {
 129                 ddr_out32(&ddr->sdram_cfg_2,
 130                           regs->ddr_sdram_cfg_2 & ~SDRAM_CFG2_D_INIT);
 131                 ddr_out32(&ddr->init_addr, CONFIG_SYS_SDRAM_BASE);
 132                 ddr_out32(&ddr->init_ext_addr, DDR_INIT_ADDR_EXT_UIA);
 133
 134                 /* DRAM VRef will not be trained */
 135                 ddr_out32(&ddr->ddr_cdr2,
 136                           regs->ddr_cdr2 & ~DDR_CDR2_VREF_TRAIN_EN);
 137         } else
 138 #endif
 139         {
 140                 ddr_out32(&ddr->sdram_cfg_2, regs->ddr_sdram_cfg_2);
 141                 ddr_out32(&ddr->init_addr, regs->ddr_init_addr);
 142                 ddr_out32(&ddr->init_ext_addr, regs->ddr_init_ext_addr);
 143                 ddr_out32(&ddr->ddr_cdr2, regs->ddr_cdr2);
 144         }
 145         ddr_out32(&ddr->err_disable, regs->err_disable);
 146         ddr_out32(&ddr->err_int_en, regs->err_int_en);
 147         for (i = 0; i < 32; i++) {
 148                 if (regs->debug[i]) {
 149                         debug("Write to debug_%d as %08x\n", i + 1,
 150                               regs->debug[i]);
 151                         ddr_out32(&ddr->debug[i], regs->debug[i]);
 152                 }
 153         }
 154
 155         /*
 156          * For RDIMMs, JEDEC spec requires clocks to be stable before reset is
 157          * deasserted. Clocks start when any chip select is enabled and clock
 158          * control register is set. Because all DDR components are connected to
 159          * one reset signal, this needs to be done in two steps. Step 1 is to
 160          * get the clocks started. Step 2 resumes after reset signal is
 161          * deasserted.
 162          */
 163         if (step == 1) {
 164                 udelay(200);
 165                 return;
 166         }
 167
 168 step2:
 169         /* Set, but do not enable the memory */
 170         temp_sdram_cfg = regs->ddr_sdram_cfg;
 171         temp_sdram_cfg &= ~(SDRAM_CFG_MEM_EN);
 172         ddr_out32(&ddr->sdram_cfg, temp_sdram_cfg);
 173
 174         /*
 175          * 500 painful micro-seconds must elapse between
 176          * the DDR clock setup and the DDR config enable.
 177          * DDR2 need 200 us, and DDR3 need 500 us from spec,
 178          * we choose the max, that is 500 us for all of case.
 179          */
 180         udelay(500);
 181         asm volatile("dsb sy;isb");
 182
 183 #ifdef CONFIG_DEEP_SLEEP
 184         if (is_warm_boot()) {
 185                 /* enter self-refresh */
 186                 temp_sdram_cfg = ddr_in32(&ddr->sdram_cfg_2);
 187                 temp_sdram_cfg |= SDRAM_CFG2_FRC_SR;
 188                 ddr_out32(&ddr->sdram_cfg_2, temp_sdram_cfg);
 189                 /* do board specific memory setup */
 190                 board_mem_sleep_setup();
 191
 192                 temp_sdram_cfg = (ddr_in32(&ddr->sdram_cfg) | SDRAM_CFG_BI);
 193         } else
 194 #endif
 195                 temp_sdram_cfg = ddr_in32(&ddr->sdram_cfg) & ~SDRAM_CFG_BI;
 196         /* Let the controller go */
 197         ddr_out32(&ddr->sdram_cfg, temp_sdram_cfg | SDRAM_CFG_MEM_EN);
 198         asm volatile("dsb sy;isb");
 199
 200         total_gb_size_per_controller = 0;
 201         for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
 202                 if (!(regs->cs[i].config & 0x80000000))
 203                         continue;
 204                 total_gb_size_per_controller += 1 << (
 205                         ((regs->cs[i].config >> 14) & 0x3) + 2 +
 206                         ((regs->cs[i].config >> 8) & 0x7) + 12 +
 207                         ((regs->cs[i].config >> 0) & 0x7) + 8 +
 208                         3 - ((regs->ddr_sdram_cfg >> 19) & 0x3) -
 209                         26);                    /* minus 26 (count of 64M) */
 210         }
 211         if (regs->cs[0].config & 0x20000000) {
 212                 /* 2-way interleaving */
 213                 total_gb_size_per_controller <<= 1;
 214         }
 215         /*
 216          * total memory / bus width = transactions needed
 217          * transactions needed / data rate = seconds
 218          * to add plenty of buffer, double the time
 219          * For example, 2GB on 666MT/s 64-bit bus takes about 402ms
 220          * Let's wait for 800ms
 221          */
 222         bus_width = 3 - ((ddr_in32(&ddr->sdram_cfg) & SDRAM_CFG_DBW_MASK)
 223                         >> SDRAM_CFG_DBW_SHIFT);
 224         timeout = ((total_gb_size_per_controller << (6 - bus_width)) * 100 /
 225                 (get_ddr_freq(ctrl_num) >> 20)) << 1;
 226         total_gb_size_per_controller >>= 4;     /* shift down to gb size */
 227         debug("total %d GB\n", total_gb_size_per_controller);
 228         debug("Need to wait up to %d * 10ms\n", timeout);
 229
 230         /* Poll DDR_SDRAM_CFG_2[D_INIT] bit until auto-data init is done.  */
 231         while ((ddr_in32(&ddr->sdram_cfg_2) & SDRAM_CFG2_D_INIT) &&
 232                 (timeout >= 0)) {
 233                 udelay(10000);          /* throttle polling rate */
 234                 timeout--;
 235         }
 236
 237         if (timeout <= 0)
 238                 printf("Waiting for D_INIT timeout. Memory may not work.\n");
 239 #ifdef CONFIG_DEEP_SLEEP
 240         if (is_warm_boot()) {
 241                 /* exit self-refresh */
 242                 temp_sdram_cfg = ddr_in32(&ddr->sdram_cfg_2);
 243                 temp_sdram_cfg &= ~SDRAM_CFG2_FRC_SR;
 244                 ddr_out32(&ddr->sdram_cfg_2, temp_sdram_cfg);
 245         }
 246 #endif
 247 }