hw/dma/xlnx-zynq-devcfg.c

   1 /*
   2  * QEMU model of the Xilinx Zynq Devcfg Interface
   3  *
   4  * (C) 2011 PetaLogix Pty Ltd
   5  * (C) 2014 Xilinx Inc.
   6  * Written by Peter Crosthwaite <peter.crosthwaite@xilinx.com>
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24  * THE SOFTWARE.
  25  */
  26
  27 #include "qemu/osdep.h"
  28 #include "hw/dma/xlnx-zynq-devcfg.h"
  29 #include "qemu/bitops.h"
  30 #include "sysemu/sysemu.h"
  31 #include "sysemu/dma.h"
  32 #include "qemu/log.h"
  33
  34 #define FREQ_HZ 900000000
  35
  36 #define BTT_MAX 0x400
  37
  38 #ifndef XLNX_ZYNQ_DEVCFG_ERR_DEBUG
  39 #define XLNX_ZYNQ_DEVCFG_ERR_DEBUG 0
  40 #endif
  41
  42 #define DB_PRINT(fmt, args...) do { \
  43     if (XLNX_ZYNQ_DEVCFG_ERR_DEBUG) { \
  44         qemu_log("%s: " fmt, __func__, ## args); \
  45     } \
  46 } while (0);
  47
  48 REG32(CTRL, 0x00)
  49     FIELD(CTRL,     FORCE_RST,          31,  1) /* Not supported, wr ignored */
  50     FIELD(CTRL,     PCAP_PR,            27,  1) /* Forced to 0 on bad unlock */
  51     FIELD(CTRL,     PCAP_MODE,          26,  1)
  52     FIELD(CTRL,     MULTIBOOT_EN,       24,  1)
  53     FIELD(CTRL,     USER_MODE,          15,  1)
  54     FIELD(CTRL,     PCFG_AES_FUSE,      12,  1)
  55     FIELD(CTRL,     PCFG_AES_EN,         9,  3)
  56     FIELD(CTRL,     SEU_EN,              8,  1)
  57     FIELD(CTRL,     SEC_EN,              7,  1)
  58     FIELD(CTRL,     SPNIDEN,             6,  1)
  59     FIELD(CTRL,     SPIDEN,              5,  1)
  60     FIELD(CTRL,     NIDEN,               4,  1)
  61     FIELD(CTRL,     DBGEN,               3,  1)
  62     FIELD(CTRL,     DAP_EN,              0,  3)
  63
  64 REG32(LOCK, 0x04)
  65 #define AES_FUSE_LOCK        4
  66 #define AES_EN_LOCK          3
  67 #define SEU_LOCK             2
  68 #define SEC_LOCK             1
  69 #define DBG_LOCK             0
  70
  71 /* mapping bits in R_LOCK to what they lock in R_CTRL */
  72 static const uint32_t lock_ctrl_map[] = {
  73     [AES_FUSE_LOCK] = R_CTRL_PCFG_AES_FUSE_MASK,
  74     [AES_EN_LOCK]   = R_CTRL_PCFG_AES_EN_MASK,
  75     [SEU_LOCK]      = R_CTRL_SEU_EN_MASK,
  76     [SEC_LOCK]      = R_CTRL_SEC_EN_MASK,
  77     [DBG_LOCK]      = R_CTRL_SPNIDEN_MASK | R_CTRL_SPIDEN_MASK |
  78                       R_CTRL_NIDEN_MASK   | R_CTRL_DBGEN_MASK  |
  79                       R_CTRL_DAP_EN_MASK,
  80 };
  81
  82 REG32(CFG, 0x08)
  83     FIELD(CFG,      RFIFO_TH,           10,  2)
  84     FIELD(CFG,      WFIFO_TH,            8,  2)
  85     FIELD(CFG,      RCLK_EDGE,           7,  1)
  86     FIELD(CFG,      WCLK_EDGE,           6,  1)
  87     FIELD(CFG,      DISABLE_SRC_INC,     5,  1)
  88     FIELD(CFG,      DISABLE_DST_INC,     4,  1)
  89 #define R_CFG_RESET 0x50B
  90
  91 REG32(INT_STS, 0x0C)
  92     FIELD(INT_STS,  PSS_GTS_USR_B,      31,  1)
  93     FIELD(INT_STS,  PSS_FST_CFG_B,      30,  1)
  94     FIELD(INT_STS,  PSS_CFG_RESET_B,    27,  1)
  95     FIELD(INT_STS,  RX_FIFO_OV,         18,  1)
  96     FIELD(INT_STS,  WR_FIFO_LVL,        17,  1)
  97     FIELD(INT_STS,  RD_FIFO_LVL,        16,  1)
  98     FIELD(INT_STS,  DMA_CMD_ERR,        15,  1)
  99     FIELD(INT_STS,  DMA_Q_OV,           14,  1)
 100     FIELD(INT_STS,  DMA_DONE,           13,  1)
 101     FIELD(INT_STS,  DMA_P_DONE,         12,  1)
 102     FIELD(INT_STS,  P2D_LEN_ERR,        11,  1)
 103     FIELD(INT_STS,  PCFG_DONE,           2,  1)
 104 #define R_INT_STS_RSVD       ((0x7 << 24) | (0x1 << 19) | (0xF < 7))
 105
 106 REG32(INT_MASK, 0x10)
 107
 108 REG32(STATUS, 0x14)
 109     FIELD(STATUS,   DMA_CMD_Q_F,        31,  1)
 110     FIELD(STATUS,   DMA_CMD_Q_E,        30,  1)
 111     FIELD(STATUS,   DMA_DONE_CNT,       28,  2)
 112     FIELD(STATUS,   RX_FIFO_LVL,        20,  5)
 113     FIELD(STATUS,   TX_FIFO_LVL,        12,  7)
 114     FIELD(STATUS,   PSS_GTS_USR_B,      11,  1)
 115     FIELD(STATUS,   PSS_FST_CFG_B,      10,  1)
 116     FIELD(STATUS,   PSS_CFG_RESET_B,     5,  1)
 117
 118 REG32(DMA_SRC_ADDR, 0x18)
 119 REG32(DMA_DST_ADDR, 0x1C)
 120 REG32(DMA_SRC_LEN, 0x20)
 121 REG32(DMA_DST_LEN, 0x24)
 122 REG32(ROM_SHADOW, 0x28)
 123 REG32(SW_ID, 0x30)
 124 REG32(UNLOCK, 0x34)
 125
 126 #define R_UNLOCK_MAGIC 0x757BDF0D
 127
 128 REG32(MCTRL, 0x80)
 129     FIELD(MCTRL,    PS_VERSION,         28,  4)
 130     FIELD(MCTRL,    PCFG_POR_B,          8,  1)
 131     FIELD(MCTRL,    INT_PCAP_LPBK,       4,  1)
 132     FIELD(MCTRL,    QEMU,                3,  1)
 133
 134 static void xlnx_zynq_devcfg_update_ixr(XlnxZynqDevcfg *s)
 135 {
 136     qemu_set_irq(s->irq, ~s->regs[R_INT_MASK] & s->regs[R_INT_STS]);
 137 }
 138
 139 static void xlnx_zynq_devcfg_reset(DeviceState *dev)
 140 {
 141     XlnxZynqDevcfg *s = XLNX_ZYNQ_DEVCFG(dev);
 142     int i;
 143
 144     for (i = 0; i < XLNX_ZYNQ_DEVCFG_R_MAX; ++i) {
 145         register_reset(&s->regs_info[i]);
 146     }
 147 }
 148
 149 static void xlnx_zynq_devcfg_dma_go(XlnxZynqDevcfg *s)
 150 {
 151     do {
 152         uint8_t buf[BTT_MAX];
 153         XlnxZynqDevcfgDMACmd *dmah = s->dma_cmd_fifo;
 154         uint32_t btt = BTT_MAX;
 155         bool loopback = s->regs[R_MCTRL] & R_MCTRL_INT_PCAP_LPBK_MASK;
 156
 157         btt = MIN(btt, dmah->src_len);
 158         if (loopback) {
 159             btt = MIN(btt, dmah->dest_len);
 160         }
 161         DB_PRINT("reading %x bytes from %x\n", btt, dmah->src_addr);
 162         dma_memory_read(&address_space_memory, dmah->src_addr, buf, btt);
 163         dmah->src_len -= btt;
 164         dmah->src_addr += btt;
 165         if (loopback && (dmah->src_len || dmah->dest_len)) {
 166             DB_PRINT("writing %x bytes from %x\n", btt, dmah->dest_addr);
 167             dma_memory_write(&address_space_memory, dmah->dest_addr, buf, btt);
 168             dmah->dest_len -= btt;
 169             dmah->dest_addr += btt;
 170         }
 171         if (!dmah->src_len && !dmah->dest_len) {
 172             DB_PRINT("dma operation finished\n");
 173             s->regs[R_INT_STS] |= R_INT_STS_DMA_DONE_MASK |
 174                                   R_INT_STS_DMA_P_DONE_MASK;
 175             s->dma_cmd_fifo_num--;
 176             memmove(s->dma_cmd_fifo, &s->dma_cmd_fifo[1],
 177                     sizeof(s->dma_cmd_fifo) - sizeof(s->dma_cmd_fifo[0]));
 178         }
 179         xlnx_zynq_devcfg_update_ixr(s);
 180     } while (s->dma_cmd_fifo_num);
 181 }
 182
 183 static void r_ixr_post_write(RegisterInfo *reg, uint64_t val)
 184 {
 185     XlnxZynqDevcfg *s = XLNX_ZYNQ_DEVCFG(reg->opaque);
 186
 187     xlnx_zynq_devcfg_update_ixr(s);
 188 }
 189
 190 static uint64_t r_ctrl_pre_write(RegisterInfo *reg, uint64_t val)
 191 {
 192     XlnxZynqDevcfg *s = XLNX_ZYNQ_DEVCFG(reg->opaque);
 193     int i;
 194
 195     for (i = 0; i < ARRAY_SIZE(lock_ctrl_map); ++i) {
 196         if (s->regs[R_LOCK] & 1 << i) {
 197             val &= ~lock_ctrl_map[i];
 198             val |= lock_ctrl_map[i] & s->regs[R_CTRL];
 199         }
 200     }
 201     return val;
 202 }
 203
 204 static void r_ctrl_post_write(RegisterInfo *reg, uint64_t val)
 205 {
 206     const char *device_prefix = object_get_typename(OBJECT(reg->opaque));
 207     uint32_t aes_en = FIELD_EX32(val, CTRL, PCFG_AES_EN);
 208
 209     if (aes_en != 0 && aes_en != 7) {
 210         qemu_log_mask(LOG_UNIMP, "%s: warning, aes-en bits inconsistent,"
 211                       "unimplemented security reset should happen!\n",
 212                       device_prefix);
 213     }
 214 }
 215
 216 static void r_unlock_post_write(RegisterInfo *reg, uint64_t val)
 217 {
 218     XlnxZynqDevcfg *s = XLNX_ZYNQ_DEVCFG(reg->opaque);
 219     const char *device_prefix = object_get_typename(OBJECT(s));
 220
 221     if (val == R_UNLOCK_MAGIC) {
 222         DB_PRINT("successful unlock\n");
 223         s->regs[R_CTRL] |= R_CTRL_PCAP_PR_MASK;
 224         s->regs[R_CTRL] |= R_CTRL_PCFG_AES_EN_MASK;
 225         memory_region_set_enabled(&s->iomem, true);
 226     } else { /* bad unlock attempt */
 227         qemu_log_mask(LOG_GUEST_ERROR, "%s: failed unlock\n", device_prefix);
 228         s->regs[R_CTRL] &= ~R_CTRL_PCAP_PR_MASK;
 229         s->regs[R_CTRL] &= ~R_CTRL_PCFG_AES_EN_MASK;
 230         /* core becomes inaccessible */
 231         memory_region_set_enabled(&s->iomem, false);
 232     }
 233 }
 234
 235 static uint64_t r_lock_pre_write(RegisterInfo *reg, uint64_t val)
 236 {
 237     XlnxZynqDevcfg *s = XLNX_ZYNQ_DEVCFG(reg->opaque);
 238
 239     /* once bits are locked they stay locked */
 240     return s->regs[R_LOCK] | val;
 241 }
 242
 243 static void r_dma_dst_len_post_write(RegisterInfo *reg, uint64_t val)
 244 {
 245     XlnxZynqDevcfg *s = XLNX_ZYNQ_DEVCFG(reg->opaque);
 246
 247     s->dma_cmd_fifo[s->dma_cmd_fifo_num] = (XlnxZynqDevcfgDMACmd) {
 248             .src_addr = s->regs[R_DMA_SRC_ADDR] & ~0x3UL,
 249             .dest_addr = s->regs[R_DMA_DST_ADDR] & ~0x3UL,
 250             .src_len = s->regs[R_DMA_SRC_LEN] << 2,
 251             .dest_len = s->regs[R_DMA_DST_LEN] << 2,
 252     };
 253     s->dma_cmd_fifo_num++;
 254     DB_PRINT("dma transfer started; %d total transfers pending\n",
 255              s->dma_cmd_fifo_num);
 256     xlnx_zynq_devcfg_dma_go(s);
 257 }
 258
 259 static const RegisterAccessInfo xlnx_zynq_devcfg_regs_info[] = {
 260     {   .name = "CTRL",                 .addr = A_CTRL,
 261         .reset = R_CTRL_PCAP_PR_MASK | R_CTRL_PCAP_MODE_MASK | 0x3 << 13,
 262         .rsvd = 0x1 << 28 | 0x3ff << 13 | 0x3 << 13,
 263         .pre_write = r_ctrl_pre_write,
 264         .post_write = r_ctrl_post_write,
 265     },
 266     {   .name = "LOCK",                 .addr = A_LOCK,
 267         .rsvd = MAKE_64BIT_MASK(5, 64 - 5),
 268         .pre_write = r_lock_pre_write,
 269     },
 270     {   .name = "CFG",                  .addr = A_CFG,
 271         .reset = R_CFG_RESET,
 272         .rsvd = 0xfffff00f,
 273     },
 274     {   .name = "INT_STS",              .addr = A_INT_STS,
 275         .w1c = ~R_INT_STS_RSVD,
 276         .reset = R_INT_STS_PSS_GTS_USR_B_MASK   |
 277                  R_INT_STS_PSS_CFG_RESET_B_MASK |
 278                  R_INT_STS_WR_FIFO_LVL_MASK,
 279         .rsvd = R_INT_STS_RSVD,
 280         .post_write = r_ixr_post_write,
 281     },
 282     {   .name = "INT_MASK",            .addr = A_INT_MASK,
 283         .reset = ~0,
 284         .rsvd = R_INT_STS_RSVD,
 285         .post_write = r_ixr_post_write,
 286     },
 287     {   .name = "STATUS",               .addr = A_STATUS,
 288         .reset = R_STATUS_DMA_CMD_Q_E_MASK      |
 289                  R_STATUS_PSS_GTS_USR_B_MASK    |
 290                  R_STATUS_PSS_CFG_RESET_B_MASK,
 291         .ro = ~0,
 292     },
 293     {   .name = "DMA_SRC_ADDR",         .addr = A_DMA_SRC_ADDR, },
 294     {   .name = "DMA_DST_ADDR",         .addr = A_DMA_DST_ADDR, },
 295     {   .name = "DMA_SRC_LEN",          .addr = A_DMA_SRC_LEN,
 296         .ro = MAKE_64BIT_MASK(27, 64 - 27) },
 297     {   .name = "DMA_DST_LEN",          .addr = A_DMA_DST_LEN,
 298         .ro = MAKE_64BIT_MASK(27, 64 - 27),
 299         .post_write = r_dma_dst_len_post_write,
 300     },
 301     {   .name = "ROM_SHADOW",           .addr = A_ROM_SHADOW,
 302         .rsvd = ~0ull,
 303     },
 304     {   .name = "SW_ID",                .addr = A_SW_ID, },
 305     {   .name = "UNLOCK",               .addr = A_UNLOCK,
 306         .post_write = r_unlock_post_write,
 307     },
 308     {   .name = "MCTRL",                .addr = R_MCTRL * 4,
 309        /* Silicon 3.0 for version field, the mysterious reserved bit 23
 310         * and QEMU platform identifier.
 311         */
 312        .reset = 0x2 << R_MCTRL_PS_VERSION_SHIFT | 1 << 23 | R_MCTRL_QEMU_MASK,
 313        .ro = ~R_MCTRL_INT_PCAP_LPBK_MASK,
 314        .rsvd = 0x00f00303,
 315     },
 316 };
 317
 318 static const MemoryRegionOps xlnx_zynq_devcfg_reg_ops = {
 319     .read = register_read_memory,
 320     .write = register_write_memory,
 321     .endianness = DEVICE_LITTLE_ENDIAN,
 322     .valid = {
 323         .min_access_size = 4,
 324         .max_access_size = 4,
 325     }
 326 };
 327
 328 static const VMStateDescription vmstate_xlnx_zynq_devcfg_dma_cmd = {
 329     .name = "xlnx_zynq_devcfg_dma_cmd",
 330     .version_id = 1,
 331     .minimum_version_id = 1,
 332     .fields = (VMStateField[]) {
 333         VMSTATE_UINT32(src_addr, XlnxZynqDevcfgDMACmd),
 334         VMSTATE_UINT32(dest_addr, XlnxZynqDevcfgDMACmd),
 335         VMSTATE_UINT32(src_len, XlnxZynqDevcfgDMACmd),
 336         VMSTATE_UINT32(dest_len, XlnxZynqDevcfgDMACmd),
 337         VMSTATE_END_OF_LIST()
 338     }
 339 };
 340
 341 static const VMStateDescription vmstate_xlnx_zynq_devcfg = {
 342     .name = "xlnx_zynq_devcfg",
 343     .version_id = 1,
 344     .minimum_version_id = 1,
 345     .fields = (VMStateField[]) {
 346         VMSTATE_STRUCT_ARRAY(dma_cmd_fifo, XlnxZynqDevcfg,
 347                              XLNX_ZYNQ_DEVCFG_DMA_CMD_FIFO_LEN, 0,
 348                              vmstate_xlnx_zynq_devcfg_dma_cmd,
 349                              XlnxZynqDevcfgDMACmd),
 350         VMSTATE_UINT8(dma_cmd_fifo_num, XlnxZynqDevcfg),
 351         VMSTATE_UINT32_ARRAY(regs, XlnxZynqDevcfg, XLNX_ZYNQ_DEVCFG_R_MAX),
 352         VMSTATE_END_OF_LIST()
 353     }
 354 };
 355
 356 static void xlnx_zynq_devcfg_init(Object *obj)
 357 {
 358     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 359     XlnxZynqDevcfg *s = XLNX_ZYNQ_DEVCFG(obj);
 360     RegisterInfoArray *reg_array;
 361
 362     sysbus_init_irq(sbd, &s->irq);
 363
 364     memory_region_init(&s->iomem, obj, "devcfg", XLNX_ZYNQ_DEVCFG_R_MAX * 4);
 365     reg_array =
 366         register_init_block32(DEVICE(obj), xlnx_zynq_devcfg_regs_info,
 367                               ARRAY_SIZE(xlnx_zynq_devcfg_regs_info),
 368                               s->regs_info, s->regs,
 369                               &xlnx_zynq_devcfg_reg_ops,
 370                               XLNX_ZYNQ_DEVCFG_ERR_DEBUG,
 371                               XLNX_ZYNQ_DEVCFG_R_MAX);
 372     memory_region_add_subregion(&s->iomem,
 373                                 A_CTRL,
 374                                 &reg_array->mem);
 375
 376     sysbus_init_mmio(sbd, &s->iomem);
 377 }
 378
 379 static void xlnx_zynq_devcfg_class_init(ObjectClass *klass, void *data)
 380 {
 381     DeviceClass *dc = DEVICE_CLASS(klass);
 382
 383     dc->reset = xlnx_zynq_devcfg_reset;
 384     dc->vmsd = &vmstate_xlnx_zynq_devcfg;
 385 }
 386
 387 static const TypeInfo xlnx_zynq_devcfg_info = {
 388     .name           = TYPE_XLNX_ZYNQ_DEVCFG,
 389     .parent         = TYPE_SYS_BUS_DEVICE,
 390     .instance_size  = sizeof(XlnxZynqDevcfg),
 391     .instance_init  = xlnx_zynq_devcfg_init,
 392     .class_init     = xlnx_zynq_devcfg_class_init,
 393 };
 394
 395 static void xlnx_zynq_devcfg_register_types(void)
 396 {
 397     type_register_static(&xlnx_zynq_devcfg_info);
 398 }
 399
 400 type_init(xlnx_zynq_devcfg_register_types)