arch/arm/mach-uniphier/dram_init.c

   1 /*
   2  * Copyright (C) 2012-2015 Panasonic Corporation
   3  * Copyright (C) 2015-2017 Socionext Inc.
   4  *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <fdtdec.h>
  11 #include <linux/errno.h>
  12 #include <linux/sizes.h>
  13
  14 #include "sg-regs.h"
  15 #include "soc-info.h"
  16
  17 #define pr_warn(fmt, args...)   printf(fmt, ##args)
  18 #define pr_err(fmt, args...)    printf(fmt, ##args)
  19
  20 DECLARE_GLOBAL_DATA_PTR;
  21
  22 struct uniphier_memif_data {
  23         unsigned int soc_id;
  24         unsigned long sparse_ch1_base;
  25         int have_ch2;
  26 };
  27
  28 static const struct uniphier_memif_data uniphier_memif_data[] = {
  29         {
  30                 .soc_id = UNIPHIER_SLD3_ID,
  31                 .sparse_ch1_base = 0xc0000000,
  32                 /*
  33                  * In fact, SLD3 has DRAM ch2, but the memory regions for ch1
  34                  * and ch2 overlap, and host cannot get access to them at the
  35                  * same time.  Hide the ch2 from U-Boot.
  36                  */
  37         },
  38         {
  39                 .soc_id = UNIPHIER_LD4_ID,
  40                 .sparse_ch1_base = 0xc0000000,
  41         },
  42         {
  43                 .soc_id = UNIPHIER_PRO4_ID,
  44                 .sparse_ch1_base = 0xa0000000,
  45         },
  46         {
  47                 .soc_id = UNIPHIER_SLD8_ID,
  48                 .sparse_ch1_base = 0xc0000000,
  49         },
  50         {
  51                 .soc_id = UNIPHIER_PRO5_ID,
  52                 .sparse_ch1_base = 0xc0000000,
  53         },
  54         {
  55                 .soc_id = UNIPHIER_PXS2_ID,
  56                 .sparse_ch1_base = 0xc0000000,
  57                 .have_ch2 = 1,
  58         },
  59         {
  60                 .soc_id = UNIPHIER_LD6B_ID,
  61                 .sparse_ch1_base = 0xc0000000,
  62                 .have_ch2 = 1,
  63         },
  64         {
  65                 .soc_id = UNIPHIER_LD11_ID,
  66                 .sparse_ch1_base = 0xc0000000,
  67         },
  68         {
  69                 .soc_id = UNIPHIER_LD20_ID,
  70                 .sparse_ch1_base = 0xc0000000,
  71                 .have_ch2 = 1,
  72         },
  73         {
  74                 .soc_id = UNIPHIER_PXS3_ID,
  75                 .sparse_ch1_base = 0xc0000000,
  76                 .have_ch2 = 1,
  77         },
  78 };
  79 UNIPHIER_DEFINE_SOCDATA_FUNC(uniphier_get_memif_data, uniphier_memif_data)
  80
  81 struct uniphier_dram_map {
  82         unsigned long base;
  83         unsigned long size;
  84 };
  85
  86 static int uniphier_memconf_decode(struct uniphier_dram_map *dram_map)
  87 {
  88         const struct uniphier_memif_data *data;
  89         unsigned long size;
  90         u32 val;
  91
  92         data = uniphier_get_memif_data();
  93         if (!data) {
  94                 pr_err("unsupported SoC\n");
  95                 return -EINVAL;
  96         }
  97
  98         val = readl(SG_MEMCONF);
  99
 100         /* set up ch0 */
 101         dram_map[0].base = CONFIG_SYS_SDRAM_BASE;
 102
 103         switch (val & SG_MEMCONF_CH0_SZ_MASK) {
 104         case SG_MEMCONF_CH0_SZ_64M:
 105                 size = SZ_64M;
 106                 break;
 107         case SG_MEMCONF_CH0_SZ_128M:
 108                 size = SZ_128M;
 109                 break;
 110         case SG_MEMCONF_CH0_SZ_256M:
 111                 size = SZ_256M;
 112                 break;
 113         case SG_MEMCONF_CH0_SZ_512M:
 114                 size = SZ_512M;
 115                 break;
 116         case SG_MEMCONF_CH0_SZ_1G:
 117                 size = SZ_1G;
 118                 break;
 119         default:
 120                 pr_err("error: invalid value is set to MEMCONF ch0 size\n");
 121                 return -EINVAL;
 122         }
 123
 124         if ((val & SG_MEMCONF_CH0_NUM_MASK) == SG_MEMCONF_CH0_NUM_2)
 125                 size *= 2;
 126
 127         dram_map[0].size = size;
 128
 129         /* set up ch1 */
 130         dram_map[1].base = dram_map[0].base + size;
 131
 132         if (val & SG_MEMCONF_SPARSEMEM) {
 133                 if (dram_map[1].base > data->sparse_ch1_base) {
 134                         pr_warn("Sparse mem is enabled, but ch0 and ch1 overlap\n");
 135                         pr_warn("Only ch0 is available\n");
 136                         dram_map[1].base = 0;
 137                         return 0;
 138                 }
 139
 140                 dram_map[1].base = data->sparse_ch1_base;
 141         }
 142
 143         switch (val & SG_MEMCONF_CH1_SZ_MASK) {
 144         case SG_MEMCONF_CH1_SZ_64M:
 145                 size = SZ_64M;
 146                 break;
 147         case SG_MEMCONF_CH1_SZ_128M:
 148                 size = SZ_128M;
 149                 break;
 150         case SG_MEMCONF_CH1_SZ_256M:
 151                 size = SZ_256M;
 152                 break;
 153         case SG_MEMCONF_CH1_SZ_512M:
 154                 size = SZ_512M;
 155                 break;
 156         case SG_MEMCONF_CH1_SZ_1G:
 157                 size = SZ_1G;
 158                 break;
 159         default:
 160                 pr_err("error: invalid value is set to MEMCONF ch1 size\n");
 161                 return -EINVAL;
 162         }
 163
 164         if ((val & SG_MEMCONF_CH1_NUM_MASK) == SG_MEMCONF_CH1_NUM_2)
 165                 size *= 2;
 166
 167         dram_map[1].size = size;
 168
 169         if (!data->have_ch2 || val & SG_MEMCONF_CH2_DISABLE)
 170                 return 0;
 171
 172         /* set up ch2 */
 173         dram_map[2].base = dram_map[1].base + size;
 174
 175         switch (val & SG_MEMCONF_CH2_SZ_MASK) {
 176         case SG_MEMCONF_CH2_SZ_64M:
 177                 size = SZ_64M;
 178                 break;
 179         case SG_MEMCONF_CH2_SZ_128M:
 180                 size = SZ_128M;
 181                 break;
 182         case SG_MEMCONF_CH2_SZ_256M:
 183                 size = SZ_256M;
 184                 break;
 185         case SG_MEMCONF_CH2_SZ_512M:
 186                 size = SZ_512M;
 187                 break;
 188         case SG_MEMCONF_CH2_SZ_1G:
 189                 size = SZ_1G;
 190                 break;
 191         default:
 192                 pr_err("error: invalid value is set to MEMCONF ch2 size\n");
 193                 return -EINVAL;
 194         }
 195
 196         if ((val & SG_MEMCONF_CH2_NUM_MASK) == SG_MEMCONF_CH2_NUM_2)
 197                 size *= 2;
 198
 199         dram_map[2].size = size;
 200
 201         return 0;
 202 }
 203
 204 int dram_init(void)
 205 {
 206         struct uniphier_dram_map dram_map[3] = {};
 207         int ret, i;
 208
 209         gd->ram_size = 0;
 210
 211         ret = uniphier_memconf_decode(dram_map);
 212         if (ret)
 213                 return ret;
 214
 215         for (i = 0; i < ARRAY_SIZE(dram_map); i++) {
 216
 217                 if (!dram_map[i].size)
 218                         break;
 219
 220                 /*
 221                  * U-Boot relocates itself to the tail of the memory region,
 222                  * but it does not expect sparse memory.  We use the first
 223                  * contiguous chunk here.
 224                  */
 225                 if (i > 0 && dram_map[i - 1].base + dram_map[i - 1].size <
 226                                                         dram_map[i].base)
 227                         break;
 228
 229                 gd->ram_size += dram_map[i].size;
 230         }
 231
 232         return 0;
 233 }
 234
 235 int dram_init_banksize(void)
 236 {
 237         struct uniphier_dram_map dram_map[3] = {};
 238         int i;
 239
 240         uniphier_memconf_decode(dram_map);
 241
 242         for (i = 0; i < ARRAY_SIZE(dram_map); i++) {
 243                 if (i >= ARRAY_SIZE(gd->bd->bi_dram))
 244                         break;
 245
 246                 gd->bd->bi_dram[i].start = dram_map[i].base;
 247                 gd->bd->bi_dram[i].size = dram_map[i].size;
 248         }
 249
 250         return 0;
 251 }
 252
 253 #ifdef CONFIG_OF_BOARD_SETUP
 254 /*
 255  * The DRAM PHY requires 64 byte scratch area in each DRAM channel
 256  * for its dynamic PHY training feature.
 257  */
 258 int ft_board_setup(void *fdt, bd_t *bd)
 259 {
 260         unsigned long rsv_addr;
 261         const unsigned long rsv_size = 64;
 262         int i, ret;
 263
 264         if (uniphier_get_soc_id() != UNIPHIER_LD20_ID)
 265                 return 0;
 266
 267         for (i = 0; i < ARRAY_SIZE(gd->bd->bi_dram); i++) {
 268                 if (!gd->bd->bi_dram[i].size)
 269                         continue;
 270
 271                 rsv_addr = gd->bd->bi_dram[i].start + gd->bd->bi_dram[i].size;
 272                 rsv_addr -= rsv_size;
 273
 274                 ret = fdt_add_mem_rsv(fdt, rsv_addr, rsv_size);
 275                 if (ret)
 276                         return -ENOSPC;
 277
 278                 printf("   Reserved memory region for DRAM PHY training: addr=%lx size=%lx\n",
 279                        rsv_addr, rsv_size);
 280         }
 281
 282         return 0;
 283 }
 284 #endif