hw/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 "hw.h"
  29 #include "sparc32_dma.h"
  30 #include "sun4m.h"
  31 #include "sysbus.h"
  32 #include "trace.h"
  33
  34 /*
  35  * This is the DMA controller part of chip STP2000 (Master I/O), also
  36  * produced as NCR89C100. See
  37  * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C100.txt
  38  * and
  39  * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/DMA2.txt
  40  */
  41
  42 #define DMA_REGS 4
  43 #define DMA_SIZE (4 * sizeof(uint32_t))
  44 /* We need the mask, because one instance of the device is not page
  45    aligned (ledma, start address 0x0010) */
  46 #define DMA_MASK (DMA_SIZE - 1)
  47
  48 #define DMA_VER 0xa0000000
  49 #define DMA_INTR 1
  50 #define DMA_INTREN 0x10
  51 #define DMA_WRITE_MEM 0x100
  52 #define DMA_EN 0x200
  53 #define DMA_LOADED 0x04000000
  54 #define DMA_DRAIN_FIFO 0x40
  55 #define DMA_RESET 0x80
  56
  57 /* XXX SCSI and ethernet should have different read-only bit masks */
  58 #define DMA_CSR_RO_MASK 0xfe000007
  59
  60 typedef struct DMAState DMAState;
  61
  62 struct DMAState {
  63     SysBusDevice busdev;
  64     uint32_t dmaregs[DMA_REGS];
  65     qemu_irq irq;
  66     void *iommu;
  67     qemu_irq gpio[2];
  68 };
  69
  70 enum {
  71     GPIO_RESET = 0,
  72     GPIO_DMA,
  73 };
  74
  75 /* Note: on sparc, the lance 16 bit bus is swapped */
  76 void ledma_memory_read(void *opaque, target_phys_addr_t addr,
  77                        uint8_t *buf, int len, int do_bswap)
  78 {
  79     DMAState *s = opaque;
  80     int i;
  81
  82     addr |= s->dmaregs[3];
  83     trace_ledma_memory_read(addr);
  84     if (do_bswap) {
  85         sparc_iommu_memory_read(s->iommu, addr, buf, len);
  86     } else {
  87         addr &= ~1;
  88         len &= ~1;
  89         sparc_iommu_memory_read(s->iommu, addr, buf, len);
  90         for(i = 0; i < len; i += 2) {
  91             bswap16s((uint16_t *)(buf + i));
  92         }
  93     }
  94 }
  95
  96 void ledma_memory_write(void *opaque, target_phys_addr_t addr,
  97                         uint8_t *buf, int len, int do_bswap)
  98 {
  99     DMAState *s = opaque;
 100     int l, i;
 101     uint16_t tmp_buf[32];
 102
 103     addr |= s->dmaregs[3];
 104     trace_ledma_memory_write(addr);
 105     if (do_bswap) {
 106         sparc_iommu_memory_write(s->iommu, addr, buf, len);
 107     } else {
 108         addr &= ~1;
 109         len &= ~1;
 110         while (len > 0) {
 111             l = len;
 112             if (l > sizeof(tmp_buf))
 113                 l = sizeof(tmp_buf);
 114             for(i = 0; i < l; i += 2) {
 115                 tmp_buf[i >> 1] = bswap16(*(uint16_t *)(buf + i));
 116             }
 117             sparc_iommu_memory_write(s->iommu, addr, (uint8_t *)tmp_buf, l);
 118             len -= l;
 119             buf += l;
 120             addr += l;
 121         }
 122     }
 123 }
 124
 125 static void dma_set_irq(void *opaque, int irq, int level)
 126 {
 127     DMAState *s = opaque;
 128     if (level) {
 129         s->dmaregs[0] |= DMA_INTR;
 130         if (s->dmaregs[0] & DMA_INTREN) {
 131             trace_sparc32_dma_set_irq_raise();
 132             qemu_irq_raise(s->irq);
 133         }
 134     } else {
 135         if (s->dmaregs[0] & DMA_INTR) {
 136             s->dmaregs[0] &= ~DMA_INTR;
 137             if (s->dmaregs[0] & DMA_INTREN) {
 138                 trace_sparc32_dma_set_irq_lower();
 139                 qemu_irq_lower(s->irq);
 140             }
 141         }
 142     }
 143 }
 144
 145 void espdma_memory_read(void *opaque, uint8_t *buf, int len)
 146 {
 147     DMAState *s = opaque;
 148
 149     trace_espdma_memory_read(s->dmaregs[1]);
 150     sparc_iommu_memory_read(s->iommu, s->dmaregs[1], buf, len);
 151     s->dmaregs[1] += len;
 152 }
 153
 154 void espdma_memory_write(void *opaque, uint8_t *buf, int len)
 155 {
 156     DMAState *s = opaque;
 157
 158     trace_espdma_memory_write(s->dmaregs[1]);
 159     sparc_iommu_memory_write(s->iommu, s->dmaregs[1], buf, len);
 160     s->dmaregs[1] += len;
 161 }
 162
 163 static uint32_t dma_mem_readl(void *opaque, target_phys_addr_t addr)
 164 {
 165     DMAState *s = opaque;
 166     uint32_t saddr;
 167
 168     saddr = (addr & DMA_MASK) >> 2;
 169     trace_sparc32_dma_mem_readl(addr, s->dmaregs[saddr]);
 170     return s->dmaregs[saddr];
 171 }
 172
 173 static void dma_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
 174 {
 175     DMAState *s = opaque;
 176     uint32_t saddr;
 177
 178     saddr = (addr & DMA_MASK) >> 2;
 179     trace_sparc32_dma_mem_writel(addr, s->dmaregs[saddr], val);
 180     switch (saddr) {
 181     case 0:
 182         if (val & DMA_INTREN) {
 183             if (s->dmaregs[0] & DMA_INTR) {
 184                 trace_sparc32_dma_set_irq_raise();
 185                 qemu_irq_raise(s->irq);
 186             }
 187         } else {
 188             if (s->dmaregs[0] & (DMA_INTR | DMA_INTREN)) {
 189                 trace_sparc32_dma_set_irq_lower();
 190                 qemu_irq_lower(s->irq);
 191             }
 192         }
 193         if (val & DMA_RESET) {
 194             qemu_irq_raise(s->gpio[GPIO_RESET]);
 195             qemu_irq_lower(s->gpio[GPIO_RESET]);
 196         } else if (val & DMA_DRAIN_FIFO) {
 197             val &= ~DMA_DRAIN_FIFO;
 198         } else if (val == 0)
 199             val = DMA_DRAIN_FIFO;
 200
 201         if (val & DMA_EN && !(s->dmaregs[0] & DMA_EN)) {
 202             trace_sparc32_dma_enable_raise();
 203             qemu_irq_raise(s->gpio[GPIO_DMA]);
 204         } else if (!(val & DMA_EN) && !!(s->dmaregs[0] & DMA_EN)) {
 205             trace_sparc32_dma_enable_lower();
 206             qemu_irq_lower(s->gpio[GPIO_DMA]);
 207         }
 208
 209         val &= ~DMA_CSR_RO_MASK;
 210         val |= DMA_VER;
 211         s->dmaregs[0] = (s->dmaregs[0] & DMA_CSR_RO_MASK) | val;
 212         break;
 213     case 1:
 214         s->dmaregs[0] |= DMA_LOADED;
 215         /* fall through */
 216     default:
 217         s->dmaregs[saddr] = val;
 218         break;
 219     }
 220 }
 221
 222 static CPUReadMemoryFunc * const dma_mem_read[3] = {
 223     NULL,
 224     NULL,
 225     dma_mem_readl,
 226 };
 227
 228 static CPUWriteMemoryFunc * const dma_mem_write[3] = {
 229     NULL,
 230     NULL,
 231     dma_mem_writel,
 232 };
 233
 234 static void dma_reset(DeviceState *d)
 235 {
 236     DMAState *s = container_of(d, DMAState, busdev.qdev);
 237
 238     memset(s->dmaregs, 0, DMA_SIZE);
 239     s->dmaregs[0] = DMA_VER;
 240 }
 241
 242 static const VMStateDescription vmstate_dma = {
 243     .name ="sparc32_dma",
 244     .version_id = 2,
 245     .minimum_version_id = 2,
 246     .minimum_version_id_old = 2,
 247     .fields      = (VMStateField []) {
 248         VMSTATE_UINT32_ARRAY(dmaregs, DMAState, DMA_REGS),
 249         VMSTATE_END_OF_LIST()
 250     }
 251 };
 252
 253 static int sparc32_dma_init1(SysBusDevice *dev)
 254 {
 255     DMAState *s = FROM_SYSBUS(DMAState, dev);
 256     int dma_io_memory;
 257
 258     sysbus_init_irq(dev, &s->irq);
 259
 260     dma_io_memory = cpu_register_io_memory(dma_mem_read, dma_mem_write, s);
 261     sysbus_init_mmio(dev, DMA_SIZE, dma_io_memory);
 262
 263     qdev_init_gpio_in(&dev->qdev, dma_set_irq, 1);
 264     qdev_init_gpio_out(&dev->qdev, s->gpio, 2);
 265
 266     return 0;
 267 }
 268
 269 static SysBusDeviceInfo sparc32_dma_info = {
 270     .init = sparc32_dma_init1,
 271     .qdev.name  = "sparc32_dma",
 272     .qdev.size  = sizeof(DMAState),
 273     .qdev.vmsd  = &vmstate_dma,
 274     .qdev.reset = dma_reset,
 275     .qdev.props = (Property[]) {
 276         DEFINE_PROP_PTR("iommu_opaque", DMAState, iommu),
 277         DEFINE_PROP_END_OF_LIST(),
 278     }
 279 };
 280
 281 static void sparc32_dma_register_devices(void)
 282 {
 283     sysbus_register_withprop(&sparc32_dma_info);
 284 }
 285
 286 device_init(sparc32_dma_register_devices)