arch/powerpc/cpu/mpc8xxx/ddr/util.c

   1 /*
   2  * Copyright 2008-2011 Freescale Semiconductor, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * Version 2 as published by the Free Software Foundation.
   7  */
   8
   9 #include <common.h>
  10 #include <asm/fsl_law.h>
  11 #include <div64.h>
  12
  13 #include "ddr.h"
  14
  15 /* To avoid 64-bit full-divides, we factor this here */
  16 #define ULL_2E12 2000000000000ULL
  17 #define UL_5POW12 244140625UL
  18 #define UL_2POW13 (1UL << 13)
  19
  20 #define ULL_8FS 0xFFFFFFFFULL
  21
  22 /*
  23  * Round up mclk_ps to nearest 1 ps in memory controller code
  24  * if the error is 0.5ps or more.
  25  *
  26  * If an imprecise data rate is too high due to rounding error
  27  * propagation, compute a suitably rounded mclk_ps to compute
  28  * a working memory controller configuration.
  29  */
  30 unsigned int get_memory_clk_period_ps(void)
  31 {
  32         unsigned int data_rate = get_ddr_freq(0);
  33         unsigned int result;
  34
  35         /* Round to nearest 10ps, being careful about 64-bit multiply/divide */
  36         unsigned long long rem, mclk_ps = ULL_2E12;
  37
  38         /* Now perform the big divide, the result fits in 32-bits */
  39         rem = do_div(mclk_ps, data_rate);
  40         result = (rem >= (data_rate >> 1)) ? mclk_ps + 1 : mclk_ps;
  41
  42         return result;
  43 }
  44
  45 /* Convert picoseconds into DRAM clock cycles (rounding up if needed). */
  46 unsigned int picos_to_mclk(unsigned int picos)
  47 {
  48         unsigned long long clks, clks_rem;
  49         unsigned long data_rate = get_ddr_freq(0);
  50
  51         /* Short circuit for zero picos */
  52         if (!picos)
  53                 return 0;
  54
  55         /* First multiply the time by the data rate (32x32 => 64) */
  56         clks = picos * (unsigned long long)data_rate;
  57         /*
  58          * Now divide by 5^12 and track the 32-bit remainder, then divide
  59          * by 2*(2^12) using shifts (and updating the remainder).
  60          */
  61         clks_rem = do_div(clks, UL_5POW12);
  62         clks_rem += (clks & (UL_2POW13-1)) * UL_5POW12;
  63         clks >>= 13;
  64
  65         /* If we had a remainder greater than the 1ps error, then round up */
  66         if (clks_rem > data_rate)
  67                 clks++;
  68
  69         /* Clamp to the maximum representable value */
  70         if (clks > ULL_8FS)
  71                 clks = ULL_8FS;
  72         return (unsigned int) clks;
  73 }
  74
  75 unsigned int mclk_to_picos(unsigned int mclk)
  76 {
  77         return get_memory_clk_period_ps() * mclk;
  78 }
  79
  80 void
  81 __fsl_ddr_set_lawbar(const common_timing_params_t *memctl_common_params,
  82                            unsigned int memctl_interleaved,
  83                            unsigned int ctrl_num)
  84 {
  85         unsigned long long base = memctl_common_params->base_address;
  86         unsigned long long size = memctl_common_params->total_mem;
  87
  88         /*
  89          * If no DIMMs on this controller, do not proceed any further.
  90          */
  91         if (!memctl_common_params->ndimms_present) {
  92                 return;
  93         }
  94
  95 #if !defined(CONFIG_PHYS_64BIT)
  96         if (base >= CONFIG_MAX_MEM_MAPPED)
  97                 return;
  98         if ((base + size) >= CONFIG_MAX_MEM_MAPPED)
  99                 size = CONFIG_MAX_MEM_MAPPED - base;
 100 #endif
 101
 102         if (ctrl_num == 0) {
 103                 /*
 104                  * Set up LAW for DDR controller 1 space.
 105                  */
 106                 unsigned int lawbar1_target_id = memctl_interleaved
 107                         ? LAW_TRGT_IF_DDR_INTRLV : LAW_TRGT_IF_DDR_1;
 108
 109                 if (set_ddr_laws(base, size, lawbar1_target_id) < 0) {
 110                         printf("%s: ERROR (ctrl #0, intrlv=%d)\n", __func__,
 111                                 memctl_interleaved);
 112                         return ;
 113                 }
 114         } else if (ctrl_num == 1) {
 115                 if (set_ddr_laws(base, size, LAW_TRGT_IF_DDR_2) < 0) {
 116                         printf("%s: ERROR (ctrl #1)\n", __func__);
 117                         return ;
 118                 }
 119         } else {
 120                 printf("%s: unexpected DDR controller number (%u)\n", __func__,
 121                         ctrl_num);
 122         }
 123 }
 124
 125 __attribute__((weak, alias("__fsl_ddr_set_lawbar"))) void
 126 fsl_ddr_set_lawbar(const common_timing_params_t *memctl_common_params,
 127                          unsigned int memctl_interleaved,
 128                          unsigned int ctrl_num);
 129
 130 void board_add_ram_info(int use_default)
 131 {
 132 #if defined(CONFIG_MPC83xx)
 133         immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
 134         ccsr_ddr_t *ddr = (void *)&immap->ddr;
 135 #elif defined(CONFIG_MPC85xx)
 136         ccsr_ddr_t *ddr = (void *)(CONFIG_SYS_MPC85xx_DDR_ADDR);
 137 #elif defined(CONFIG_MPC86xx)
 138         ccsr_ddr_t *ddr = (void *)(CONFIG_SYS_MPC86xx_DDR_ADDR);
 139 #endif
 140 #if (CONFIG_NUM_DDR_CONTROLLERS > 1)
 141         uint32_t cs0_config = in_be32(&ddr->cs0_config);
 142 #endif
 143         uint32_t sdram_cfg = in_be32(&ddr->sdram_cfg);
 144         int cas_lat;
 145
 146         puts(" (DDR");
 147         switch ((sdram_cfg & SDRAM_CFG_SDRAM_TYPE_MASK) >>
 148                 SDRAM_CFG_SDRAM_TYPE_SHIFT) {
 149         case SDRAM_TYPE_DDR1:
 150                 puts("1");
 151                 break;
 152         case SDRAM_TYPE_DDR2:
 153                 puts("2");
 154                 break;
 155         case SDRAM_TYPE_DDR3:
 156                 puts("3");
 157                 break;
 158         default:
 159                 puts("?");
 160                 break;
 161         }
 162
 163         if (sdram_cfg & SDRAM_CFG_32_BE)
 164                 puts(", 32-bit");
 165         else if (sdram_cfg & SDRAM_CFG_16_BE)
 166                 puts(", 16-bit");
 167         else
 168                 puts(", 64-bit");
 169
 170         /* Calculate CAS latency based on timing cfg values */
 171         cas_lat = ((in_be32(&ddr->timing_cfg_1) >> 16) & 0xf) + 1;
 172         if ((in_be32(&ddr->timing_cfg_3) >> 12) & 1)
 173                 cas_lat += (8 << 1);
 174         printf(", CL=%d", cas_lat >> 1);
 175         if (cas_lat & 0x1)
 176                 puts(".5");
 177
 178         if (sdram_cfg & SDRAM_CFG_ECC_EN)
 179                 puts(", ECC on)");
 180         else
 181                 puts(", ECC off)");
 182
 183 #if (CONFIG_NUM_DDR_CONTROLLERS > 1)
 184         if (cs0_config & 0x20000000) {
 185                 puts("\n");
 186                 puts("       DDR Controller Interleaving Mode: ");
 187
 188                 switch ((cs0_config >> 24) & 0xf) {
 189                 case FSL_DDR_CACHE_LINE_INTERLEAVING:
 190                         puts("cache line");
 191                         break;
 192                 case FSL_DDR_PAGE_INTERLEAVING:
 193                         puts("page");
 194                         break;
 195                 case FSL_DDR_BANK_INTERLEAVING:
 196                         puts("bank");
 197                         break;
 198                 case FSL_DDR_SUPERBANK_INTERLEAVING:
 199                         puts("super-bank");
 200                         break;
 201                 default:
 202                         puts("invalid");
 203                         break;
 204                 }
 205         }
 206 #endif
 207
 208         if ((sdram_cfg >> 8) & 0x7f) {
 209                 puts("\n");
 210                 puts("       DDR Chip-Select Interleaving Mode: ");
 211                 switch(sdram_cfg >> 8 & 0x7f) {
 212                 case FSL_DDR_CS0_CS1_CS2_CS3:
 213                         puts("CS0+CS1+CS2+CS3");
 214                         break;
 215                 case FSL_DDR_CS0_CS1:
 216                         puts("CS0+CS1");
 217                         break;
 218                 case FSL_DDR_CS2_CS3:
 219                         puts("CS2+CS3");
 220                         break;
 221                 case FSL_DDR_CS0_CS1_AND_CS2_CS3:
 222                         puts("CS0+CS1 and CS2+CS3");
 223                         break;
 224                 default:
 225                         puts("invalid");
 226                         break;
 227                 }
 228         }
 229 }