1 /* 2 * Raspberry Pi (BCM2835) SD Host Controller 3 * 4 * Copyright (c) 2017 Antfield SAS 5 * 6 * Authors: 7 * Clement Deschamps <clement.deschamps@antfield.fr> 8 * Luc Michel <luc.michel@antfield.fr> 9 * 10 * This work is licensed under the terms of the GNU GPL, version 2 or later. 11 * See the COPYING file in the top-level directory. 12 */ 13 14 #include "qemu/osdep.h" 15 #include "qemu/log.h" 16 #include "qemu/module.h" 17 #include "sysemu/blockdev.h" 18 #include "hw/irq.h" 19 #include "hw/sd/bcm2835_sdhost.h" 20 #include "migration/vmstate.h" 21 #include "trace.h" 22 #include "qom/object.h" 23 24 #define TYPE_BCM2835_SDHOST_BUS "bcm2835-sdhost-bus" 25 /* This is reusing the SDBus typedef from SD_BUS */ 26 DECLARE_INSTANCE_CHECKER(SDBus, BCM2835_SDHOST_BUS, 27 TYPE_BCM2835_SDHOST_BUS) 28 29 #define SDCMD 0x00 /* Command to SD card - 16 R/W */ 30 #define SDARG 0x04 /* Argument to SD card - 32 R/W */ 31 #define SDTOUT 0x08 /* Start value for timeout counter - 32 R/W */ 32 #define SDCDIV 0x0c /* Start value for clock divider - 11 R/W */ 33 #define SDRSP0 0x10 /* SD card rsp (31:0) - 32 R */ 34 #define SDRSP1 0x14 /* SD card rsp (63:32) - 32 R */ 35 #define SDRSP2 0x18 /* SD card rsp (95:64) - 32 R */ 36 #define SDRSP3 0x1c /* SD card rsp (127:96) - 32 R */ 37 #define SDHSTS 0x20 /* SD host status - 11 R */ 38 #define SDVDD 0x30 /* SD card power control - 1 R/W */ 39 #define SDEDM 0x34 /* Emergency Debug Mode - 13 R/W */ 40 #define SDHCFG 0x38 /* Host configuration - 2 R/W */ 41 #define SDHBCT 0x3c /* Host byte count (debug) - 32 R/W */ 42 #define SDDATA 0x40 /* Data to/from SD card - 32 R/W */ 43 #define SDHBLC 0x50 /* Host block count (SDIO/SDHC) - 9 R/W */ 44 45 #define SDCMD_NEW_FLAG 0x8000 46 #define SDCMD_FAIL_FLAG 0x4000 47 #define SDCMD_BUSYWAIT 0x800 48 #define SDCMD_NO_RESPONSE 0x400 49 #define SDCMD_LONG_RESPONSE 0x200 50 #define SDCMD_WRITE_CMD 0x80 51 #define SDCMD_READ_CMD 0x40 52 #define SDCMD_CMD_MASK 0x3f 53 54 #define SDCDIV_MAX_CDIV 0x7ff 55 56 #define SDHSTS_BUSY_IRPT 0x400 57 #define SDHSTS_BLOCK_IRPT 0x200 58 #define SDHSTS_SDIO_IRPT 0x100 59 #define SDHSTS_REW_TIME_OUT 0x80 60 #define SDHSTS_CMD_TIME_OUT 0x40 61 #define SDHSTS_CRC16_ERROR 0x20 62 #define SDHSTS_CRC7_ERROR 0x10 63 #define SDHSTS_FIFO_ERROR 0x08 64 /* Reserved */ 65 /* Reserved */ 66 #define SDHSTS_DATA_FLAG 0x01 67 68 #define SDHCFG_BUSY_IRPT_EN (1 << 10) 69 #define SDHCFG_BLOCK_IRPT_EN (1 << 8) 70 #define SDHCFG_SDIO_IRPT_EN (1 << 5) 71 #define SDHCFG_DATA_IRPT_EN (1 << 4) 72 #define SDHCFG_SLOW_CARD (1 << 3) 73 #define SDHCFG_WIDE_EXT_BUS (1 << 2) 74 #define SDHCFG_WIDE_INT_BUS (1 << 1) 75 #define SDHCFG_REL_CMD_LINE (1 << 0) 76 77 #define SDEDM_FORCE_DATA_MODE (1 << 19) 78 #define SDEDM_CLOCK_PULSE (1 << 20) 79 #define SDEDM_BYPASS (1 << 21) 80 81 #define SDEDM_WRITE_THRESHOLD_SHIFT 9 82 #define SDEDM_READ_THRESHOLD_SHIFT 14 83 #define SDEDM_THRESHOLD_MASK 0x1f 84 85 #define SDEDM_FSM_MASK 0xf 86 #define SDEDM_FSM_IDENTMODE 0x0 87 #define SDEDM_FSM_DATAMODE 0x1 88 #define SDEDM_FSM_READDATA 0x2 89 #define SDEDM_FSM_WRITEDATA 0x3 90 #define SDEDM_FSM_READWAIT 0x4 91 #define SDEDM_FSM_READCRC 0x5 92 #define SDEDM_FSM_WRITECRC 0x6 93 #define SDEDM_FSM_WRITEWAIT1 0x7 94 #define SDEDM_FSM_POWERDOWN 0x8 95 #define SDEDM_FSM_POWERUP 0x9 96 #define SDEDM_FSM_WRITESTART1 0xa 97 #define SDEDM_FSM_WRITESTART2 0xb 98 #define SDEDM_FSM_GENPULSES 0xc 99 #define SDEDM_FSM_WRITEWAIT2 0xd 100 #define SDEDM_FSM_STARTPOWDOWN 0xf 101 102 #define SDDATA_FIFO_WORDS 16 103 104 static void bcm2835_sdhost_update_irq(BCM2835SDHostState *s) 105 { 106 uint32_t irq = s->status & 107 (SDHSTS_BUSY_IRPT | SDHSTS_BLOCK_IRPT | SDHSTS_SDIO_IRPT); 108 trace_bcm2835_sdhost_update_irq(irq); 109 qemu_set_irq(s->irq, !!irq); 110 } 111 112 static void bcm2835_sdhost_send_command(BCM2835SDHostState *s) 113 { 114 SDRequest request; 115 uint8_t rsp[16]; 116 int rlen; 117 118 request.cmd = s->cmd & SDCMD_CMD_MASK; 119 request.arg = s->cmdarg; 120 121 rlen = sdbus_do_command(&s->sdbus, &request, rsp); 122 if (rlen < 0) { 123 goto error; 124 } 125 if (!(s->cmd & SDCMD_NO_RESPONSE)) { 126 if (rlen == 0 || (rlen == 4 && (s->cmd & SDCMD_LONG_RESPONSE))) { 127 goto error; 128 } 129 if (rlen != 4 && rlen != 16) { 130 goto error; 131 } 132 if (rlen == 4) { 133 s->rsp[0] = ldl_be_p(&rsp[0]); 134 s->rsp[1] = s->rsp[2] = s->rsp[3] = 0; 135 } else { 136 s->rsp[0] = ldl_be_p(&rsp[12]); 137 s->rsp[1] = ldl_be_p(&rsp[8]); 138 s->rsp[2] = ldl_be_p(&rsp[4]); 139 s->rsp[3] = ldl_be_p(&rsp[0]); 140 } 141 } 142 /* We never really delay commands, so if this was a 'busywait' command 143 * then we've completed it now and can raise the interrupt. 144 */ 145 if ((s->cmd & SDCMD_BUSYWAIT) && (s->config & SDHCFG_BUSY_IRPT_EN)) { 146 s->status |= SDHSTS_BUSY_IRPT; 147 } 148 return; 149 150 error: 151 s->cmd |= SDCMD_FAIL_FLAG; 152 s->status |= SDHSTS_CMD_TIME_OUT; 153 } 154 155 static void bcm2835_sdhost_fifo_push(BCM2835SDHostState *s, uint32_t value) 156 { 157 int n; 158 159 if (s->fifo_len == BCM2835_SDHOST_FIFO_LEN) { 160 /* FIFO overflow */ 161 return; 162 } 163 n = (s->fifo_pos + s->fifo_len) & (BCM2835_SDHOST_FIFO_LEN - 1); 164 s->fifo_len++; 165 s->fifo[n] = value; 166 } 167 168 static uint32_t bcm2835_sdhost_fifo_pop(BCM2835SDHostState *s) 169 { 170 uint32_t value; 171 172 if (s->fifo_len == 0) { 173 /* FIFO underflow */ 174 return 0; 175 } 176 value = s->fifo[s->fifo_pos]; 177 s->fifo_len--; 178 s->fifo_pos = (s->fifo_pos + 1) & (BCM2835_SDHOST_FIFO_LEN - 1); 179 return value; 180 } 181 182 static void bcm2835_sdhost_fifo_run(BCM2835SDHostState *s) 183 { 184 uint32_t value = 0; 185 int n; 186 int is_read; 187 int is_write; 188 189 is_read = (s->cmd & SDCMD_READ_CMD) != 0; 190 is_write = (s->cmd & SDCMD_WRITE_CMD) != 0; 191 if (s->datacnt != 0 && (is_write || sdbus_data_ready(&s->sdbus))) { 192 if (is_read) { 193 n = 0; 194 while (s->datacnt && s->fifo_len < BCM2835_SDHOST_FIFO_LEN) { 195 value |= (uint32_t)sdbus_read_byte(&s->sdbus) << (n * 8); 196 s->datacnt--; 197 n++; 198 if (n == 4) { 199 bcm2835_sdhost_fifo_push(s, value); 200 s->status |= SDHSTS_DATA_FLAG; 201 if (s->config & SDHCFG_DATA_IRPT_EN) { 202 s->status |= SDHSTS_SDIO_IRPT; 203 } 204 n = 0; 205 value = 0; 206 } 207 } 208 if (n != 0) { 209 bcm2835_sdhost_fifo_push(s, value); 210 s->status |= SDHSTS_DATA_FLAG; 211 if (s->config & SDHCFG_DATA_IRPT_EN) { 212 s->status |= SDHSTS_SDIO_IRPT; 213 } 214 } 215 } else if (is_write) { /* write */ 216 n = 0; 217 while (s->datacnt > 0 && (s->fifo_len > 0 || n > 0)) { 218 if (n == 0) { 219 value = bcm2835_sdhost_fifo_pop(s); 220 s->status |= SDHSTS_DATA_FLAG; 221 if (s->config & SDHCFG_DATA_IRPT_EN) { 222 s->status |= SDHSTS_SDIO_IRPT; 223 } 224 n = 4; 225 } 226 n--; 227 s->datacnt--; 228 sdbus_write_byte(&s->sdbus, value & 0xff); 229 value >>= 8; 230 } 231 } 232 if (s->datacnt == 0) { 233 s->edm &= ~SDEDM_FSM_MASK; 234 s->edm |= SDEDM_FSM_DATAMODE; 235 trace_bcm2835_sdhost_edm_change("datacnt 0", s->edm); 236 } 237 if (is_write) { 238 /* set block interrupt at end of each block transfer */ 239 if (s->hbct && s->datacnt % s->hbct == 0 && 240 (s->config & SDHCFG_BLOCK_IRPT_EN)) { 241 s->status |= SDHSTS_BLOCK_IRPT; 242 } 243 /* set data interrupt after each transfer */ 244 s->status |= SDHSTS_DATA_FLAG; 245 if (s->config & SDHCFG_DATA_IRPT_EN) { 246 s->status |= SDHSTS_SDIO_IRPT; 247 } 248 } 249 } 250 251 bcm2835_sdhost_update_irq(s); 252 253 s->edm &= ~(0x1f << 4); 254 s->edm |= ((s->fifo_len & 0x1f) << 4); 255 trace_bcm2835_sdhost_edm_change("fifo run", s->edm); 256 } 257 258 static uint64_t bcm2835_sdhost_read(void *opaque, hwaddr offset, 259 unsigned size) 260 { 261 BCM2835SDHostState *s = (BCM2835SDHostState *)opaque; 262 uint32_t res = 0; 263 264 switch (offset) { 265 case SDCMD: 266 res = s->cmd; 267 break; 268 case SDHSTS: 269 res = s->status; 270 break; 271 case SDRSP0: 272 res = s->rsp[0]; 273 break; 274 case SDRSP1: 275 res = s->rsp[1]; 276 break; 277 case SDRSP2: 278 res = s->rsp[2]; 279 break; 280 case SDRSP3: 281 res = s->rsp[3]; 282 break; 283 case SDEDM: 284 res = s->edm; 285 break; 286 case SDVDD: 287 res = s->vdd; 288 break; 289 case SDDATA: 290 res = bcm2835_sdhost_fifo_pop(s); 291 bcm2835_sdhost_fifo_run(s); 292 break; 293 case SDHBCT: 294 res = s->hbct; 295 break; 296 case SDHBLC: 297 res = s->hblc; 298 break; 299 300 default: 301 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n", 302 __func__, offset); 303 res = 0; 304 break; 305 } 306 307 trace_bcm2835_sdhost_read(offset, res, size); 308 309 return res; 310 } 311 312 static void bcm2835_sdhost_write(void *opaque, hwaddr offset, 313 uint64_t value, unsigned size) 314 { 315 BCM2835SDHostState *s = (BCM2835SDHostState *)opaque; 316 317 trace_bcm2835_sdhost_write(offset, value, size); 318 319 switch (offset) { 320 case SDCMD: 321 s->cmd = value; 322 if (value & SDCMD_NEW_FLAG) { 323 bcm2835_sdhost_send_command(s); 324 bcm2835_sdhost_fifo_run(s); 325 s->cmd &= ~SDCMD_NEW_FLAG; 326 } 327 break; 328 case SDTOUT: 329 break; 330 case SDCDIV: 331 break; 332 case SDHSTS: 333 s->status &= ~value; 334 bcm2835_sdhost_update_irq(s); 335 break; 336 case SDARG: 337 s->cmdarg = value; 338 break; 339 case SDEDM: 340 if ((value & 0xf) == 0xf) { 341 /* power down */ 342 value &= ~0xf; 343 } 344 s->edm = value; 345 trace_bcm2835_sdhost_edm_change("guest register write", s->edm); 346 break; 347 case SDHCFG: 348 s->config = value; 349 bcm2835_sdhost_fifo_run(s); 350 break; 351 case SDVDD: 352 s->vdd = value; 353 break; 354 case SDDATA: 355 bcm2835_sdhost_fifo_push(s, value); 356 bcm2835_sdhost_fifo_run(s); 357 break; 358 case SDHBCT: 359 s->hbct = value; 360 break; 361 case SDHBLC: 362 s->hblc = value; 363 s->datacnt = s->hblc * s->hbct; 364 bcm2835_sdhost_fifo_run(s); 365 break; 366 367 default: 368 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n", 369 __func__, offset); 370 break; 371 } 372 } 373 374 static const MemoryRegionOps bcm2835_sdhost_ops = { 375 .read = bcm2835_sdhost_read, 376 .write = bcm2835_sdhost_write, 377 .endianness = DEVICE_NATIVE_ENDIAN, 378 }; 379 380 static const VMStateDescription vmstate_bcm2835_sdhost = { 381 .name = TYPE_BCM2835_SDHOST, 382 .version_id = 1, 383 .minimum_version_id = 1, 384 .fields = (VMStateField[]) { 385 VMSTATE_UINT32(cmd, BCM2835SDHostState), 386 VMSTATE_UINT32(cmdarg, BCM2835SDHostState), 387 VMSTATE_UINT32(status, BCM2835SDHostState), 388 VMSTATE_UINT32_ARRAY(rsp, BCM2835SDHostState, 4), 389 VMSTATE_UINT32(config, BCM2835SDHostState), 390 VMSTATE_UINT32(edm, BCM2835SDHostState), 391 VMSTATE_UINT32(vdd, BCM2835SDHostState), 392 VMSTATE_UINT32(hbct, BCM2835SDHostState), 393 VMSTATE_UINT32(hblc, BCM2835SDHostState), 394 VMSTATE_INT32(fifo_pos, BCM2835SDHostState), 395 VMSTATE_INT32(fifo_len, BCM2835SDHostState), 396 VMSTATE_UINT32_ARRAY(fifo, BCM2835SDHostState, BCM2835_SDHOST_FIFO_LEN), 397 VMSTATE_UINT32(datacnt, BCM2835SDHostState), 398 VMSTATE_END_OF_LIST() 399 } 400 }; 401 402 static void bcm2835_sdhost_init(Object *obj) 403 { 404 BCM2835SDHostState *s = BCM2835_SDHOST(obj); 405 406 qbus_init(&s->sdbus, sizeof(s->sdbus), 407 TYPE_BCM2835_SDHOST_BUS, DEVICE(s), "sd-bus"); 408 409 memory_region_init_io(&s->iomem, obj, &bcm2835_sdhost_ops, s, 410 TYPE_BCM2835_SDHOST, 0x1000); 411 sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem); 412 sysbus_init_irq(SYS_BUS_DEVICE(s), &s->irq); 413 } 414 415 static void bcm2835_sdhost_reset(DeviceState *dev) 416 { 417 BCM2835SDHostState *s = BCM2835_SDHOST(dev); 418 419 s->cmd = 0; 420 s->cmdarg = 0; 421 s->edm = 0x0000c60f; 422 trace_bcm2835_sdhost_edm_change("device reset", s->edm); 423 s->config = 0; 424 s->hbct = 0; 425 s->hblc = 0; 426 s->datacnt = 0; 427 s->fifo_pos = 0; 428 s->fifo_len = 0; 429 } 430 431 static void bcm2835_sdhost_class_init(ObjectClass *klass, void *data) 432 { 433 DeviceClass *dc = DEVICE_CLASS(klass); 434 435 dc->reset = bcm2835_sdhost_reset; 436 dc->vmsd = &vmstate_bcm2835_sdhost; 437 } 438 439 static const TypeInfo bcm2835_sdhost_types[] = { 440 { 441 .name = TYPE_BCM2835_SDHOST, 442 .parent = TYPE_SYS_BUS_DEVICE, 443 .instance_size = sizeof(BCM2835SDHostState), 444 .class_init = bcm2835_sdhost_class_init, 445 .instance_init = bcm2835_sdhost_init, 446 }, 447 { 448 .name = TYPE_BCM2835_SDHOST_BUS, 449 .parent = TYPE_SD_BUS, 450 .instance_size = sizeof(SDBus), 451 }, 452 }; 453 454 DEFINE_TYPES(bcm2835_sdhost_types) 455