LXR qemu/hw/misc/omap

   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 */
  24struct omap_sdrc_s {
  25    MemoryRegion iomem;
  26    uint8_t config;
  27};
  28
  29void omap_sdrc_reset(struct omap_sdrc_s *s)
  30{
  31    s->config = 0x10;
  32}
  33
  34static 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
  89static 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        return omap_badwidth_write32(opaque, addr, value);
  96    }
  97
  98    switch (addr) {
  99    case 0x00:  /* SDRC_REVISION */
 100    case 0x14:  /* SDRC_SYSSTATUS */
 101    case 0x48:  /* SDRC_ERR_ADDR */
 102    case 0x64:  /* SDRC_DLLA_STATUS */
 103    case 0x6c:  /* SDRC_DLLB_STATUS */
 104        OMAP_RO_REG(addr);
 105        return;
 106
 107    case 0x10:  /* SDRC_SYSCONFIG */
 108        if ((value >> 3) != 0x2)
 109            fprintf(stderr, "%s: bad SDRAM idle mode %i\n",
 110                    __FUNCTION__, (unsigned)value >> 3);
 111        if (value & 2)
 112            omap_sdrc_reset(s);
 113        s->config = value & 0x18;
 114        break;
 115
 116    case 0x40:  /* SDRC_CS_CFG */
 117    case 0x44:  /* SDRC_SHARING */
 118    case 0x4c:  /* SDRC_ERR_TYPE */
 119    case 0x60:  /* SDRC_DLLA_SCTRL */
 120    case 0x68:  /* SDRC_DLLB_CTRL */
 121    case 0x70:  /* SDRC_POWER */
 122    case 0x80:  /* SDRC_MCFG_0 */
 123    case 0x84:  /* SDRC_MR_0 */
 124    case 0x88:  /* SDRC_EMR1_0 */
 125    case 0x8c:  /* SDRC_EMR2_0 */
 126    case 0x90:  /* SDRC_EMR3_0 */
 127    case 0x94:  /* SDRC_DCDL1_CTRL */
 128    case 0x98:  /* SDRC_DCDL2_CTRL */
 129    case 0x9c:  /* SDRC_ACTIM_CTRLA_0 */
 130    case 0xa0:  /* SDRC_ACTIM_CTRLB_0 */
 131    case 0xa4:  /* SDRC_RFR_CTRL_0 */
 132    case 0xa8:  /* SDRC_MANUAL_0 */
 133    case 0xb0:  /* SDRC_MCFG_1 */
 134    case 0xb4:  /* SDRC_MR_1 */
 135    case 0xb8:  /* SDRC_EMR1_1 */
 136    case 0xbc:  /* SDRC_EMR2_1 */
 137    case 0xc0:  /* SDRC_EMR3_1 */
 138    case 0xc4:  /* SDRC_ACTIM_CTRLA_1 */
 139    case 0xc8:  /* SDRC_ACTIM_CTRLB_1 */
 140    case 0xd4:  /* SDRC_RFR_CTRL_1 */
 141    case 0xd8:  /* SDRC_MANUAL_1 */
 142        break;
 143
 144    default:
 145        OMAP_BAD_REG(addr);
 146        return;
 147    }
 148}
 149
 150static const MemoryRegionOps omap_sdrc_ops = {
 151    .read = omap_sdrc_read,
 152    .write = omap_sdrc_write,
 153    .endianness = DEVICE_NATIVE_ENDIAN,
 154};
 155
 156struct omap_sdrc_s *omap_sdrc_init(MemoryRegion *sysmem,
 157                                   hwaddr base)
 158{
 159    struct omap_sdrc_s *s = (struct omap_sdrc_s *)
 160            g_malloc0(sizeof(struct omap_sdrc_s));
 161
 162    omap_sdrc_reset(s);
 163
 164    memory_region_init_io(&s->iomem, NULL, &omap_sdrc_ops, s, "omap.sdrc", 0x1000);
 165    memory_region_add_subregion(sysmem, base, &s->iomem);
 166
 167    return s;
 168}
 169