hw/misc/omap_sdrc.c

   1 /*
   2  * TI OMAP SDRAM controller emulation.
   3  *
   4  * Copyright (C) 2007-2008 Nokia Corporation
   5  * Written by Andrzej Zaborowski <andrew@openedhand.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 or
  10  * (at your option) any later version of the License.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20 #include "hw/hw.h"
  21 #include "hw/arm/omap.h"
  22
  23 /* SDRAM Controller Subsystem */
  24 struct omap_sdrc_s {
  25     MemoryRegion iomem;
  26     uint8_t config;
  27 };
  28
  29 void omap_sdrc_reset(struct omap_sdrc_s *s)
  30 {
  31     s->config = 0x10;
  32 }
  33
  34 static uint64_t omap_sdrc_read(void *opaque, hwaddr addr,
  35                                unsigned size)
  36 {
  37     struct omap_sdrc_s *s = (struct omap_sdrc_s *) opaque;
  38
  39     if (size != 4) {
  40         return omap_badwidth_read32(opaque, addr);
  41     }
  42
  43     switch (addr) {
  44     case 0x00:  /* SDRC_REVISION */
  45         return 0x20;
  46
  47     case 0x10:  /* SDRC_SYSCONFIG */
  48         return s->config;
  49
  50     case 0x14:  /* SDRC_SYSSTATUS */
  51         return 1;                                               /* RESETDONE */
  52
  53     case 0x40:  /* SDRC_CS_CFG */
  54     case 0x44:  /* SDRC_SHARING */
  55     case 0x48:  /* SDRC_ERR_ADDR */
  56     case 0x4c:  /* SDRC_ERR_TYPE */
  57     case 0x60:  /* SDRC_DLLA_SCTRL */
  58     case 0x64:  /* SDRC_DLLA_STATUS */
  59     case 0x68:  /* SDRC_DLLB_CTRL */
  60     case 0x6c:  /* SDRC_DLLB_STATUS */
  61     case 0x70:  /* SDRC_POWER */
  62     case 0x80:  /* SDRC_MCFG_0 */
  63     case 0x84:  /* SDRC_MR_0 */
  64     case 0x88:  /* SDRC_EMR1_0 */
  65     case 0x8c:  /* SDRC_EMR2_0 */
  66     case 0x90:  /* SDRC_EMR3_0 */
  67     case 0x94:  /* SDRC_DCDL1_CTRL */
  68     case 0x98:  /* SDRC_DCDL2_CTRL */
  69     case 0x9c:  /* SDRC_ACTIM_CTRLA_0 */
  70     case 0xa0:  /* SDRC_ACTIM_CTRLB_0 */
  71     case 0xa4:  /* SDRC_RFR_CTRL_0 */
  72     case 0xa8:  /* SDRC_MANUAL_0 */
  73     case 0xb0:  /* SDRC_MCFG_1 */
  74     case 0xb4:  /* SDRC_MR_1 */
  75     case 0xb8:  /* SDRC_EMR1_1 */
  76     case 0xbc:  /* SDRC_EMR2_1 */
  77     case 0xc0:  /* SDRC_EMR3_1 */
  78     case 0xc4:  /* SDRC_ACTIM_CTRLA_1 */
  79     case 0xc8:  /* SDRC_ACTIM_CTRLB_1 */
  80     case 0xd4:  /* SDRC_RFR_CTRL_1 */
  81     case 0xd8:  /* SDRC_MANUAL_1 */
  82         return 0x00;
  83     }
  84
  85     OMAP_BAD_REG(addr);
  86     return 0;
  87 }
  88
  89 static void omap_sdrc_write(void *opaque, hwaddr addr,
  90                             uint64_t value, unsigned size)
  91 {
  92     struct omap_sdrc_s *s = (struct omap_sdrc_s *) opaque;
  93
  94     if (size != 4) {
  95         omap_badwidth_write32(opaque, addr, value);
  96         return;
  97     }
  98
  99     switch (addr) {
 100     case 0x00:  /* SDRC_REVISION */
 101     case 0x14:  /* SDRC_SYSSTATUS */
 102     case 0x48:  /* SDRC_ERR_ADDR */
 103     case 0x64:  /* SDRC_DLLA_STATUS */
 104     case 0x6c:  /* SDRC_DLLB_STATUS */
 105         OMAP_RO_REG(addr);
 106         return;
 107
 108     case 0x10:  /* SDRC_SYSCONFIG */
 109         if ((value >> 3) != 0x2)
 110             fprintf(stderr, "%s: bad SDRAM idle mode %i\n",
 111                     __FUNCTION__, (unsigned)value >> 3);
 112         if (value & 2)
 113             omap_sdrc_reset(s);
 114         s->config = value & 0x18;
 115         break;
 116
 117     case 0x40:  /* SDRC_CS_CFG */
 118     case 0x44:  /* SDRC_SHARING */
 119     case 0x4c:  /* SDRC_ERR_TYPE */
 120     case 0x60:  /* SDRC_DLLA_SCTRL */
 121     case 0x68:  /* SDRC_DLLB_CTRL */
 122     case 0x70:  /* SDRC_POWER */
 123     case 0x80:  /* SDRC_MCFG_0 */
 124     case 0x84:  /* SDRC_MR_0 */
 125     case 0x88:  /* SDRC_EMR1_0 */
 126     case 0x8c:  /* SDRC_EMR2_0 */
 127     case 0x90:  /* SDRC_EMR3_0 */
 128     case 0x94:  /* SDRC_DCDL1_CTRL */
 129     case 0x98:  /* SDRC_DCDL2_CTRL */
 130     case 0x9c:  /* SDRC_ACTIM_CTRLA_0 */
 131     case 0xa0:  /* SDRC_ACTIM_CTRLB_0 */
 132     case 0xa4:  /* SDRC_RFR_CTRL_0 */
 133     case 0xa8:  /* SDRC_MANUAL_0 */
 134     case 0xb0:  /* SDRC_MCFG_1 */
 135     case 0xb4:  /* SDRC_MR_1 */
 136     case 0xb8:  /* SDRC_EMR1_1 */
 137     case 0xbc:  /* SDRC_EMR2_1 */
 138     case 0xc0:  /* SDRC_EMR3_1 */
 139     case 0xc4:  /* SDRC_ACTIM_CTRLA_1 */
 140     case 0xc8:  /* SDRC_ACTIM_CTRLB_1 */
 141     case 0xd4:  /* SDRC_RFR_CTRL_1 */
 142     case 0xd8:  /* SDRC_MANUAL_1 */
 143         break;
 144
 145     default:
 146         OMAP_BAD_REG(addr);
 147         return;
 148     }
 149 }
 150
 151 static const MemoryRegionOps omap_sdrc_ops = {
 152     .read = omap_sdrc_read,
 153     .write = omap_sdrc_write,
 154     .endianness = DEVICE_NATIVE_ENDIAN,
 155 };
 156
 157 struct omap_sdrc_s *omap_sdrc_init(MemoryRegion *sysmem,
 158                                    hwaddr base)
 159 {
 160     struct omap_sdrc_s *s = (struct omap_sdrc_s *)
 161             g_malloc0(sizeof(struct omap_sdrc_s));
 162
 163     omap_sdrc_reset(s);
 164
 165     memory_region_init_io(&s->iomem, NULL, &omap_sdrc_ops, s, "omap.sdrc", 0x1000);
 166     memory_region_add_subregion(sysmem, base, &s->iomem);
 167
 168     return s;
 169 }