hw/dma/sparc32_dma.c

   1 /*
   2  * QEMU Sparc32 DMA controller emulation
   3  *
   4  * Copyright (c) 2006 Fabrice Bellard
   5  *
   6  * Modifications:
   7  *  2010-Feb-14 Artyom Tarasenko : reworked irq generation
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  22  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25  * THE SOFTWARE.
  26  */
  27
  28 #include "qemu/osdep.h"
  29 #include "hw/irq.h"
  30 #include "hw/qdev-properties.h"
  31 #include "hw/sparc/sparc32_dma.h"
  32 #include "hw/sparc/sun4m_iommu.h"
  33 #include "hw/sysbus.h"
  34 #include "migration/vmstate.h"
  35 #include "sysemu/dma.h"
  36 #include "qapi/error.h"
  37 #include "qemu/module.h"
  38 #include "trace.h"
  39
  40 /*
  41  * This is the DMA controller part of chip STP2000 (Master I/O), also
  42  * produced as NCR89C100. See
  43  * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C100.txt
  44  * and
  45  * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/DMA2.txt
  46  */
  47
  48 #define DMA_SIZE (4 * sizeof(uint32_t))
  49 /* We need the mask, because one instance of the device is not page
  50    aligned (ledma, start address 0x0010) */
  51 #define DMA_MASK (DMA_SIZE - 1)
  52 /* OBP says 0x20 bytes for ledma, the extras are aliased to espdma */
  53 #define DMA_ETH_SIZE (8 * sizeof(uint32_t))
  54 #define DMA_MAX_REG_OFFSET (2 * DMA_SIZE - 1)
  55
  56 #define DMA_VER 0xa0000000
  57 #define DMA_INTR 1
  58 #define DMA_INTREN 0x10
  59 #define DMA_WRITE_MEM 0x100
  60 #define DMA_EN 0x200
  61 #define DMA_LOADED 0x04000000
  62 #define DMA_DRAIN_FIFO 0x40
  63 #define DMA_RESET 0x80
  64
  65 /* XXX SCSI and ethernet should have different read-only bit masks */
  66 #define DMA_CSR_RO_MASK 0xfe000007
  67
  68 enum {
  69     GPIO_RESET = 0,
  70     GPIO_DMA,
  71 };
  72
  73 /* Note: on sparc, the lance 16 bit bus is swapped */
  74 void ledma_memory_read(void *opaque, hwaddr addr,
  75                        uint8_t *buf, int len, int do_bswap)
  76 {
  77     DMADeviceState *s = opaque;
  78     IOMMUState *is = (IOMMUState *)s->iommu;
  79     int i;
  80
  81     addr |= s->dmaregs[3];
  82     trace_ledma_memory_read(addr, len);
  83     if (do_bswap) {
  84         dma_memory_read(&is->iommu_as, addr, buf, len, MEMTXATTRS_UNSPECIFIED);
  85     } else {
  86         addr &= ~1;
  87         len &= ~1;
  88         dma_memory_read(&is->iommu_as, addr, buf, len, MEMTXATTRS_UNSPECIFIED);
  89         for(i = 0; i < len; i += 2) {
  90             bswap16s((uint16_t *)(buf + i));
  91         }
  92     }
  93 }
  94
  95 void ledma_memory_write(void *opaque, hwaddr addr,
  96                         uint8_t *buf, int len, int do_bswap)
  97 {
  98     DMADeviceState *s = opaque;
  99     IOMMUState *is = (IOMMUState *)s->iommu;
 100     int l, i;
 101     uint16_t tmp_buf[32];
 102
 103     addr |= s->dmaregs[3];
 104     trace_ledma_memory_write(addr, len);
 105     if (do_bswap) {
 106         dma_memory_write(&is->iommu_as, addr, buf, len,
 107                          MEMTXATTRS_UNSPECIFIED);
 108     } else {
 109         addr &= ~1;
 110         len &= ~1;
 111         while (len > 0) {
 112             l = len;
 113             if (l > sizeof(tmp_buf))
 114                 l = sizeof(tmp_buf);
 115             for(i = 0; i < l; i += 2) {
 116                 tmp_buf[i >> 1] = bswap16(*(uint16_t *)(buf + i));
 117             }
 118             dma_memory_write(&is->iommu_as, addr, tmp_buf, l,
 119                              MEMTXATTRS_UNSPECIFIED);
 120             len -= l;
 121             buf += l;
 122             addr += l;
 123         }
 124     }
 125 }
 126
 127 static void dma_set_irq(void *opaque, int irq, int level)
 128 {
 129     DMADeviceState *s = opaque;
 130     if (level) {
 131         s->dmaregs[0] |= DMA_INTR;
 132         if (s->dmaregs[0] & DMA_INTREN) {
 133             trace_sparc32_dma_set_irq_raise();
 134             qemu_irq_raise(s->irq);
 135         }
 136     } else {
 137         if (s->dmaregs[0] & DMA_INTR) {
 138             s->dmaregs[0] &= ~DMA_INTR;
 139             if (s->dmaregs[0] & DMA_INTREN) {
 140                 trace_sparc32_dma_set_irq_lower();
 141                 qemu_irq_lower(s->irq);
 142             }
 143         }
 144     }
 145 }
 146
 147 void espdma_memory_read(void *opaque, uint8_t *buf, int len)
 148 {
 149     DMADeviceState *s = opaque;
 150     IOMMUState *is = (IOMMUState *)s->iommu;
 151
 152     trace_espdma_memory_read(s->dmaregs[1], len);
 153     dma_memory_read(&is->iommu_as, s->dmaregs[1], buf, len,
 154                     MEMTXATTRS_UNSPECIFIED);
 155     s->dmaregs[1] += len;
 156 }
 157
 158 void espdma_memory_write(void *opaque, uint8_t *buf, int len)
 159 {
 160     DMADeviceState *s = opaque;
 161     IOMMUState *is = (IOMMUState *)s->iommu;
 162
 163     trace_espdma_memory_write(s->dmaregs[1], len);
 164     dma_memory_write(&is->iommu_as, s->dmaregs[1], buf, len,
 165                      MEMTXATTRS_UNSPECIFIED);
 166     s->dmaregs[1] += len;
 167 }
 168
 169 static uint64_t dma_mem_read(void *opaque, hwaddr addr,
 170                              unsigned size)
 171 {
 172     DMADeviceState *s = opaque;
 173     uint32_t saddr;
 174
 175     saddr = (addr & DMA_MASK) >> 2;
 176     trace_sparc32_dma_mem_readl(addr, s->dmaregs[saddr]);
 177     return s->dmaregs[saddr];
 178 }
 179
 180 static void dma_mem_write(void *opaque, hwaddr addr,
 181                           uint64_t val, unsigned size)
 182 {
 183     DMADeviceState *s = opaque;
 184     uint32_t saddr;
 185
 186     saddr = (addr & DMA_MASK) >> 2;
 187     trace_sparc32_dma_mem_writel(addr, s->dmaregs[saddr], val);
 188     switch (saddr) {
 189     case 0:
 190         if (val & DMA_INTREN) {
 191             if (s->dmaregs[0] & DMA_INTR) {
 192                 trace_sparc32_dma_set_irq_raise();
 193                 qemu_irq_raise(s->irq);
 194             }
 195         } else {
 196             if (s->dmaregs[0] & (DMA_INTR | DMA_INTREN)) {
 197                 trace_sparc32_dma_set_irq_lower();
 198                 qemu_irq_lower(s->irq);
 199             }
 200         }
 201         if (val & DMA_RESET) {
 202             qemu_irq_raise(s->gpio[GPIO_RESET]);
 203             qemu_irq_lower(s->gpio[GPIO_RESET]);
 204         } else if (val & DMA_DRAIN_FIFO) {
 205             val &= ~DMA_DRAIN_FIFO;
 206         } else if (val == 0)
 207             val = DMA_DRAIN_FIFO;
 208
 209         if (val & DMA_EN && !(s->dmaregs[0] & DMA_EN)) {
 210             trace_sparc32_dma_enable_raise();
 211             qemu_irq_raise(s->gpio[GPIO_DMA]);
 212         } else if (!(val & DMA_EN) && !!(s->dmaregs[0] & DMA_EN)) {
 213             trace_sparc32_dma_enable_lower();
 214             qemu_irq_lower(s->gpio[GPIO_DMA]);
 215         }
 216
 217         val &= ~DMA_CSR_RO_MASK;
 218         val |= DMA_VER;
 219         s->dmaregs[0] = (s->dmaregs[0] & DMA_CSR_RO_MASK) | val;
 220         break;
 221     case 1:
 222         s->dmaregs[0] |= DMA_LOADED;
 223         /* fall through */
 224     default:
 225         s->dmaregs[saddr] = val;
 226         break;
 227     }
 228 }
 229
 230 static const MemoryRegionOps dma_mem_ops = {
 231     .read = dma_mem_read,
 232     .write = dma_mem_write,
 233     .endianness = DEVICE_NATIVE_ENDIAN,
 234     .valid = {
 235         .min_access_size = 4,
 236         .max_access_size = 4,
 237     },
 238 };
 239
 240 static void sparc32_dma_device_reset(DeviceState *d)
 241 {
 242     DMADeviceState *s = SPARC32_DMA_DEVICE(d);
 243
 244     memset(s->dmaregs, 0, DMA_SIZE);
 245     s->dmaregs[0] = DMA_VER;
 246 }
 247
 248 static const VMStateDescription vmstate_sparc32_dma_device = {
 249     .name ="sparc32_dma",
 250     .version_id = 2,
 251     .minimum_version_id = 2,
 252     .fields = (VMStateField[]) {
 253         VMSTATE_UINT32_ARRAY(dmaregs, DMADeviceState, DMA_REGS),
 254         VMSTATE_END_OF_LIST()
 255     }
 256 };
 257
 258 static void sparc32_dma_device_init(Object *obj)
 259 {
 260     DeviceState *dev = DEVICE(obj);
 261     DMADeviceState *s = SPARC32_DMA_DEVICE(obj);
 262     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 263
 264     sysbus_init_irq(sbd, &s->irq);
 265
 266     sysbus_init_mmio(sbd, &s->iomem);
 267
 268     object_property_add_link(OBJECT(dev), "iommu", TYPE_SUN4M_IOMMU,
 269                              (Object **) &s->iommu,
 270                              qdev_prop_allow_set_link_before_realize,
 271                              0);
 272
 273     qdev_init_gpio_in(dev, dma_set_irq, 1);
 274     qdev_init_gpio_out(dev, s->gpio, 2);
 275 }
 276
 277 static void sparc32_dma_device_class_init(ObjectClass *klass, void *data)
 278 {
 279     DeviceClass *dc = DEVICE_CLASS(klass);
 280
 281     dc->reset = sparc32_dma_device_reset;
 282     dc->vmsd = &vmstate_sparc32_dma_device;
 283 }
 284
 285 static const TypeInfo sparc32_dma_device_info = {
 286     .name          = TYPE_SPARC32_DMA_DEVICE,
 287     .parent        = TYPE_SYS_BUS_DEVICE,
 288     .abstract      = true,
 289     .instance_size = sizeof(DMADeviceState),
 290     .instance_init = sparc32_dma_device_init,
 291     .class_init    = sparc32_dma_device_class_init,
 292 };
 293
 294 static void sparc32_espdma_device_init(Object *obj)
 295 {
 296     DMADeviceState *s = SPARC32_DMA_DEVICE(obj);
 297     ESPDMADeviceState *es = SPARC32_ESPDMA_DEVICE(obj);
 298
 299     memory_region_init_io(&s->iomem, OBJECT(s), &dma_mem_ops, s,
 300                           "espdma-mmio", DMA_SIZE);
 301
 302     object_initialize_child(obj, "esp", &es->esp, TYPE_SYSBUS_ESP);
 303 }
 304
 305 static void sparc32_espdma_device_realize(DeviceState *dev, Error **errp)
 306 {
 307     ESPDMADeviceState *es = SPARC32_ESPDMA_DEVICE(dev);
 308     SysBusESPState *sysbus = SYSBUS_ESP(&es->esp);
 309     ESPState *esp = &sysbus->esp;
 310
 311     esp->dma_memory_read = espdma_memory_read;
 312     esp->dma_memory_write = espdma_memory_write;
 313     esp->dma_opaque = SPARC32_DMA_DEVICE(dev);
 314     sysbus->it_shift = 2;
 315     esp->dma_enabled = 1;
 316     sysbus_realize(SYS_BUS_DEVICE(sysbus), &error_fatal);
 317 }
 318
 319 static void sparc32_espdma_device_class_init(ObjectClass *klass, void *data)
 320 {
 321     DeviceClass *dc = DEVICE_CLASS(klass);
 322
 323     dc->realize = sparc32_espdma_device_realize;
 324 }
 325
 326 static const TypeInfo sparc32_espdma_device_info = {
 327     .name          = TYPE_SPARC32_ESPDMA_DEVICE,
 328     .parent        = TYPE_SPARC32_DMA_DEVICE,
 329     .instance_size = sizeof(ESPDMADeviceState),
 330     .instance_init = sparc32_espdma_device_init,
 331     .class_init    = sparc32_espdma_device_class_init,
 332 };
 333
 334 static void sparc32_ledma_device_init(Object *obj)
 335 {
 336     DMADeviceState *s = SPARC32_DMA_DEVICE(obj);
 337     LEDMADeviceState *ls = SPARC32_LEDMA_DEVICE(obj);
 338
 339     memory_region_init_io(&s->iomem, OBJECT(s), &dma_mem_ops, s,
 340                           "ledma-mmio", DMA_SIZE);
 341
 342     object_initialize_child(obj, "lance", &ls->lance, TYPE_LANCE);
 343 }
 344
 345 static void sparc32_ledma_device_realize(DeviceState *dev, Error **errp)
 346 {
 347     LEDMADeviceState *s = SPARC32_LEDMA_DEVICE(dev);
 348     SysBusPCNetState *lance = SYSBUS_PCNET(&s->lance);
 349
 350     object_property_set_link(OBJECT(lance), "dma", OBJECT(dev), &error_abort);
 351     sysbus_realize(SYS_BUS_DEVICE(lance), &error_fatal);
 352 }
 353
 354 static void sparc32_ledma_device_class_init(ObjectClass *klass, void *data)
 355 {
 356     DeviceClass *dc = DEVICE_CLASS(klass);
 357
 358     dc->realize = sparc32_ledma_device_realize;
 359 }
 360
 361 static const TypeInfo sparc32_ledma_device_info = {
 362     .name          = TYPE_SPARC32_LEDMA_DEVICE,
 363     .parent        = TYPE_SPARC32_DMA_DEVICE,
 364     .instance_size = sizeof(LEDMADeviceState),
 365     .instance_init = sparc32_ledma_device_init,
 366     .class_init    = sparc32_ledma_device_class_init,
 367 };
 368
 369 static void sparc32_dma_realize(DeviceState *dev, Error **errp)
 370 {
 371     SPARC32DMAState *s = SPARC32_DMA(dev);
 372     DeviceState *espdma, *esp, *ledma, *lance;
 373     SysBusDevice *sbd;
 374     Object *iommu;
 375
 376     iommu = object_resolve_path_type("", TYPE_SUN4M_IOMMU, NULL);
 377     if (!iommu) {
 378         error_setg(errp, "unable to locate sun4m IOMMU device");
 379         return;
 380     }
 381
 382     espdma = DEVICE(&s->espdma);
 383     object_property_set_link(OBJECT(espdma), "iommu", iommu, &error_abort);
 384     sysbus_realize(SYS_BUS_DEVICE(espdma), &error_fatal);
 385
 386     esp = DEVICE(object_resolve_path_component(OBJECT(espdma), "esp"));
 387     sbd = SYS_BUS_DEVICE(esp);
 388     sysbus_connect_irq(sbd, 0, qdev_get_gpio_in(espdma, 0));
 389     qdev_connect_gpio_out(espdma, 0, qdev_get_gpio_in(esp, 0));
 390     qdev_connect_gpio_out(espdma, 1, qdev_get_gpio_in(esp, 1));
 391
 392     sbd = SYS_BUS_DEVICE(espdma);
 393     memory_region_add_subregion(&s->dmamem, 0x0,
 394                                 sysbus_mmio_get_region(sbd, 0));
 395
 396     ledma = DEVICE(&s->ledma);
 397     object_property_set_link(OBJECT(ledma), "iommu", iommu, &error_abort);
 398     sysbus_realize(SYS_BUS_DEVICE(ledma), &error_fatal);
 399
 400     lance = DEVICE(object_resolve_path_component(OBJECT(ledma), "lance"));
 401     sbd = SYS_BUS_DEVICE(lance);
 402     sysbus_connect_irq(sbd, 0, qdev_get_gpio_in(ledma, 0));
 403     qdev_connect_gpio_out(ledma, 0, qdev_get_gpio_in(lance, 0));
 404
 405     sbd = SYS_BUS_DEVICE(ledma);
 406     memory_region_add_subregion(&s->dmamem, 0x10,
 407                                 sysbus_mmio_get_region(sbd, 0));
 408
 409     /* Add ledma alias to handle SunOS 5.7 - Solaris 9 invalid access bug */
 410     memory_region_init_alias(&s->ledma_alias, OBJECT(dev), "ledma-alias",
 411                              sysbus_mmio_get_region(sbd, 0), 0x4, 0x4);
 412     memory_region_add_subregion(&s->dmamem, 0x20, &s->ledma_alias);
 413 }
 414
 415 static void sparc32_dma_init(Object *obj)
 416 {
 417     SPARC32DMAState *s = SPARC32_DMA(obj);
 418     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 419
 420     memory_region_init(&s->dmamem, OBJECT(s), "dma", DMA_SIZE + DMA_ETH_SIZE);
 421     sysbus_init_mmio(sbd, &s->dmamem);
 422
 423     object_initialize_child(obj, "espdma", &s->espdma,
 424                             TYPE_SPARC32_ESPDMA_DEVICE);
 425     object_initialize_child(obj, "ledma", &s->ledma,
 426                             TYPE_SPARC32_LEDMA_DEVICE);
 427 }
 428
 429 static void sparc32_dma_class_init(ObjectClass *klass, void *data)
 430 {
 431     DeviceClass *dc = DEVICE_CLASS(klass);
 432
 433     dc->realize = sparc32_dma_realize;
 434 }
 435
 436 static const TypeInfo sparc32_dma_info = {
 437     .name          = TYPE_SPARC32_DMA,
 438     .parent        = TYPE_SYS_BUS_DEVICE,
 439     .instance_size = sizeof(SPARC32DMAState),
 440     .instance_init = sparc32_dma_init,
 441     .class_init    = sparc32_dma_class_init,
 442 };
 443
 444
 445 static void sparc32_dma_register_types(void)
 446 {
 447     type_register_static(&sparc32_dma_device_info);
 448     type_register_static(&sparc32_espdma_device_info);
 449     type_register_static(&sparc32_ledma_device_info);
 450     type_register_static(&sparc32_dma_info);
 451 }
 452
 453 type_init(sparc32_dma_register_types)