hw/misc/aspeed_sdmc.c

   1 /*
   2  * ASPEED SDRAM Memory Controller
   3  *
   4  * Copyright (C) 2016 IBM Corp.
   5  *
   6  * This code is licensed under the GPL version 2 or later.  See
   7  * the COPYING file in the top-level directory.
   8  */
   9
  10 #include "qemu/osdep.h"
  11 #include "qemu/log.h"
  12 #include "qemu/error-report.h"
  13 #include "hw/misc/aspeed_sdmc.h"
  14 #include "hw/misc/aspeed_scu.h"
  15 #include "hw/qdev-properties.h"
  16 #include "qapi/error.h"
  17 #include "trace.h"
  18
  19 /* Protection Key Register */
  20 #define R_PROT            (0x00 / 4)
  21 #define   PROT_KEY_UNLOCK     0xFC600309
  22
  23 /* Configuration Register */
  24 #define R_CONF            (0x04 / 4)
  25
  26 /*
  27  * Configuration register Ox4 (for Aspeed AST2400 SOC)
  28  *
  29  * These are for the record and future use. ASPEED_SDMC_DRAM_SIZE is
  30  * what we care about right now as it is checked by U-Boot to
  31  * determine the RAM size.
  32  */
  33
  34 #define ASPEED_SDMC_RESERVED            0xFFFFF800 /* 31:11 reserved */
  35 #define ASPEED_SDMC_AST2300_COMPAT      (1 << 10)
  36 #define ASPEED_SDMC_SCRAMBLE_PATTERN    (1 << 9)
  37 #define ASPEED_SDMC_DATA_SCRAMBLE       (1 << 8)
  38 #define ASPEED_SDMC_ECC_ENABLE          (1 << 7)
  39 #define ASPEED_SDMC_VGA_COMPAT          (1 << 6) /* readonly */
  40 #define ASPEED_SDMC_DRAM_BANK           (1 << 5)
  41 #define ASPEED_SDMC_DRAM_BURST          (1 << 4)
  42 #define ASPEED_SDMC_VGA_APERTURE(x)     ((x & 0x3) << 2) /* readonly */
  43 #define     ASPEED_SDMC_VGA_8MB             0x0
  44 #define     ASPEED_SDMC_VGA_16MB            0x1
  45 #define     ASPEED_SDMC_VGA_32MB            0x2
  46 #define     ASPEED_SDMC_VGA_64MB            0x3
  47 #define ASPEED_SDMC_DRAM_SIZE(x)        (x & 0x3)
  48 #define     ASPEED_SDMC_DRAM_64MB           0x0
  49 #define     ASPEED_SDMC_DRAM_128MB          0x1
  50 #define     ASPEED_SDMC_DRAM_256MB          0x2
  51 #define     ASPEED_SDMC_DRAM_512MB          0x3
  52
  53 #define ASPEED_SDMC_READONLY_MASK                       \
  54     (ASPEED_SDMC_RESERVED | ASPEED_SDMC_VGA_COMPAT |    \
  55      ASPEED_SDMC_VGA_APERTURE(ASPEED_SDMC_VGA_64MB))
  56 /*
  57  * Configuration register Ox4 (for Aspeed AST2500 SOC and higher)
  58  *
  59  * Incompatibilities are annotated in the list. ASPEED_SDMC_HW_VERSION
  60  * should be set to 1 for the AST2500 SOC.
  61  */
  62 #define ASPEED_SDMC_HW_VERSION(x)       ((x & 0xf) << 28) /* readonly */
  63 #define ASPEED_SDMC_SW_VERSION          ((x & 0xff) << 20)
  64 #define ASPEED_SDMC_CACHE_INITIAL_DONE  (1 << 19)  /* readonly */
  65 #define ASPEED_SDMC_AST2500_RESERVED    0x7C000 /* 18:14 reserved */
  66 #define ASPEED_SDMC_CACHE_DDR4_CONF     (1 << 13)
  67 #define ASPEED_SDMC_CACHE_INITIAL       (1 << 12)
  68 #define ASPEED_SDMC_CACHE_RANGE_CTRL    (1 << 11)
  69 #define ASPEED_SDMC_CACHE_ENABLE        (1 << 10) /* differs from AST2400 */
  70 #define ASPEED_SDMC_DRAM_TYPE           (1 << 4)  /* differs from AST2400 */
  71
  72 /* DRAM size definitions differs */
  73 #define     ASPEED_SDMC_AST2500_128MB       0x0
  74 #define     ASPEED_SDMC_AST2500_256MB       0x1
  75 #define     ASPEED_SDMC_AST2500_512MB       0x2
  76 #define     ASPEED_SDMC_AST2500_1024MB      0x3
  77
  78 #define ASPEED_SDMC_AST2500_READONLY_MASK                               \
  79     (ASPEED_SDMC_HW_VERSION(0xf) | ASPEED_SDMC_CACHE_INITIAL_DONE |     \
  80      ASPEED_SDMC_AST2500_RESERVED | ASPEED_SDMC_VGA_COMPAT |            \
  81      ASPEED_SDMC_VGA_APERTURE(ASPEED_SDMC_VGA_64MB))
  82
  83 static uint64_t aspeed_sdmc_read(void *opaque, hwaddr addr, unsigned size)
  84 {
  85     AspeedSDMCState *s = ASPEED_SDMC(opaque);
  86
  87     addr >>= 2;
  88
  89     if (addr >= ARRAY_SIZE(s->regs)) {
  90         qemu_log_mask(LOG_GUEST_ERROR,
  91                       "%s: Out-of-bounds read at offset 0x%" HWADDR_PRIx "\n",
  92                       __func__, addr);
  93         return 0;
  94     }
  95
  96     return s->regs[addr];
  97 }
  98
  99 static void aspeed_sdmc_write(void *opaque, hwaddr addr, uint64_t data,
 100                              unsigned int size)
 101 {
 102     AspeedSDMCState *s = ASPEED_SDMC(opaque);
 103
 104     addr >>= 2;
 105
 106     if (addr >= ARRAY_SIZE(s->regs)) {
 107         qemu_log_mask(LOG_GUEST_ERROR,
 108                       "%s: Out-of-bounds write at offset 0x%" HWADDR_PRIx "\n",
 109                       __func__, addr);
 110         return;
 111     }
 112
 113     if (addr != R_PROT && s->regs[R_PROT] != PROT_KEY_UNLOCK) {
 114         qemu_log_mask(LOG_GUEST_ERROR, "%s: SDMC is locked!\n", __func__);
 115         return;
 116     }
 117
 118     if (addr == R_CONF) {
 119         /* Make sure readonly bits are kept */
 120         switch (s->silicon_rev) {
 121         case AST2400_A0_SILICON_REV:
 122             data &= ~ASPEED_SDMC_READONLY_MASK;
 123             break;
 124         case AST2500_A0_SILICON_REV:
 125             data &= ~ASPEED_SDMC_AST2500_READONLY_MASK;
 126             break;
 127         default:
 128             g_assert_not_reached();
 129         }
 130     }
 131
 132     s->regs[addr] = data;
 133 }
 134
 135 static const MemoryRegionOps aspeed_sdmc_ops = {
 136     .read = aspeed_sdmc_read,
 137     .write = aspeed_sdmc_write,
 138     .endianness = DEVICE_LITTLE_ENDIAN,
 139     .valid.min_access_size = 4,
 140     .valid.max_access_size = 4,
 141 };
 142
 143 static int ast2400_rambits(AspeedSDMCState *s)
 144 {
 145     switch (s->ram_size >> 20) {
 146     case 64:
 147         return ASPEED_SDMC_DRAM_64MB;
 148     case 128:
 149         return ASPEED_SDMC_DRAM_128MB;
 150     case 256:
 151         return ASPEED_SDMC_DRAM_256MB;
 152     case 512:
 153         return ASPEED_SDMC_DRAM_512MB;
 154     default:
 155         break;
 156     }
 157
 158     /* use a common default */
 159     error_report("warning: Invalid RAM size 0x%" PRIx64
 160                  ". Using default 256M", s->ram_size);
 161     s->ram_size = 256 << 20;
 162     return ASPEED_SDMC_DRAM_256MB;
 163 }
 164
 165 static int ast2500_rambits(AspeedSDMCState *s)
 166 {
 167     switch (s->ram_size >> 20) {
 168     case 128:
 169         return ASPEED_SDMC_AST2500_128MB;
 170     case 256:
 171         return ASPEED_SDMC_AST2500_256MB;
 172     case 512:
 173         return ASPEED_SDMC_AST2500_512MB;
 174     case 1024:
 175         return ASPEED_SDMC_AST2500_1024MB;
 176     default:
 177         break;
 178     }
 179
 180     /* use a common default */
 181     error_report("warning: Invalid RAM size 0x%" PRIx64
 182                  ". Using default 512M", s->ram_size);
 183     s->ram_size = 512 << 20;
 184     return ASPEED_SDMC_AST2500_512MB;
 185 }
 186
 187 static void aspeed_sdmc_reset(DeviceState *dev)
 188 {
 189     AspeedSDMCState *s = ASPEED_SDMC(dev);
 190
 191     memset(s->regs, 0, sizeof(s->regs));
 192
 193     /* Set ram size bit and defaults values */
 194     switch (s->silicon_rev) {
 195     case AST2400_A0_SILICON_REV:
 196         s->regs[R_CONF] |=
 197             ASPEED_SDMC_VGA_COMPAT |
 198             ASPEED_SDMC_DRAM_SIZE(s->ram_bits);
 199         break;
 200
 201     case AST2500_A0_SILICON_REV:
 202     case AST2500_A1_SILICON_REV:
 203         s->regs[R_CONF] |=
 204             ASPEED_SDMC_HW_VERSION(1) |
 205             ASPEED_SDMC_VGA_APERTURE(ASPEED_SDMC_VGA_64MB) |
 206             ASPEED_SDMC_DRAM_SIZE(s->ram_bits);
 207         break;
 208
 209     default:
 210         g_assert_not_reached();
 211     }
 212 }
 213
 214 static void aspeed_sdmc_realize(DeviceState *dev, Error **errp)
 215 {
 216     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
 217     AspeedSDMCState *s = ASPEED_SDMC(dev);
 218
 219     if (!is_supported_silicon_rev(s->silicon_rev)) {
 220         error_setg(errp, "Unknown silicon revision: 0x%" PRIx32,
 221                 s->silicon_rev);
 222         return;
 223     }
 224
 225     switch (s->silicon_rev) {
 226     case AST2400_A0_SILICON_REV:
 227         s->ram_bits = ast2400_rambits(s);
 228         break;
 229     case AST2500_A0_SILICON_REV:
 230     case AST2500_A1_SILICON_REV:
 231         s->ram_bits = ast2500_rambits(s);
 232         break;
 233     default:
 234         g_assert_not_reached();
 235     }
 236
 237     memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_sdmc_ops, s,
 238                           TYPE_ASPEED_SDMC, 0x1000);
 239     sysbus_init_mmio(sbd, &s->iomem);
 240 }
 241
 242 static const VMStateDescription vmstate_aspeed_sdmc = {
 243     .name = "aspeed.sdmc",
 244     .version_id = 1,
 245     .minimum_version_id = 1,
 246     .fields = (VMStateField[]) {
 247         VMSTATE_UINT32_ARRAY(regs, AspeedSDMCState, ASPEED_SDMC_NR_REGS),
 248         VMSTATE_END_OF_LIST()
 249     }
 250 };
 251
 252 static Property aspeed_sdmc_properties[] = {
 253     DEFINE_PROP_UINT32("silicon-rev", AspeedSDMCState, silicon_rev, 0),
 254     DEFINE_PROP_UINT64("ram-size", AspeedSDMCState, ram_size, 0),
 255     DEFINE_PROP_END_OF_LIST(),
 256 };
 257
 258 static void aspeed_sdmc_class_init(ObjectClass *klass, void *data)
 259 {
 260     DeviceClass *dc = DEVICE_CLASS(klass);
 261     dc->realize = aspeed_sdmc_realize;
 262     dc->reset = aspeed_sdmc_reset;
 263     dc->desc = "ASPEED SDRAM Memory Controller";
 264     dc->vmsd = &vmstate_aspeed_sdmc;
 265     dc->props = aspeed_sdmc_properties;
 266 }
 267
 268 static const TypeInfo aspeed_sdmc_info = {
 269     .name = TYPE_ASPEED_SDMC,
 270     .parent = TYPE_SYS_BUS_DEVICE,
 271     .instance_size = sizeof(AspeedSDMCState),
 272     .class_init = aspeed_sdmc_class_init,
 273 };
 274
 275 static void aspeed_sdmc_register_types(void)
 276 {
 277     type_register_static(&aspeed_sdmc_info);
 278 }
 279
 280 type_init(aspeed_sdmc_register_types);