hw/sparc32_dma.c

   1 /*
   2  * QEMU Sparc32 DMA controller emulation
   3  *
   4  * Copyright (c) 2006 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "hw.h"
  26 #include "sparc32_dma.h"
  27 #include "sun4m.h"
  28 #include "sysbus.h"
  29
  30 /* debug DMA */
  31 //#define DEBUG_DMA
  32
  33 /*
  34  * This is the DMA controller part of chip STP2000 (Master I/O), also
  35  * produced as NCR89C100. See
  36  * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C100.txt
  37  * and
  38  * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/DMA2.txt
  39  */
  40
  41 #ifdef DEBUG_DMA
  42 #define DPRINTF(fmt, ...)                               \
  43     do { printf("DMA: " fmt , ## __VA_ARGS__); } while (0)
  44 #else
  45 #define DPRINTF(fmt, ...)
  46 #endif
  47
  48 #define DMA_REGS 4
  49 #define DMA_SIZE (4 * sizeof(uint32_t))
  50 /* We need the mask, because one instance of the device is not page
  51    aligned (ledma, start address 0x0010) */
  52 #define DMA_MASK (DMA_SIZE - 1)
  53
  54 #define DMA_VER 0xa0000000
  55 #define DMA_INTR 1
  56 #define DMA_INTREN 0x10
  57 #define DMA_WRITE_MEM 0x100
  58 #define DMA_LOADED 0x04000000
  59 #define DMA_DRAIN_FIFO 0x40
  60 #define DMA_RESET 0x80
  61
  62 typedef struct DMAState DMAState;
  63
  64 struct DMAState {
  65     SysBusDevice busdev;
  66     uint32_t dmaregs[DMA_REGS];
  67     qemu_irq irq;
  68     void *iommu;
  69     qemu_irq dev_reset;
  70 };
  71
  72 /* Note: on sparc, the lance 16 bit bus is swapped */
  73 void ledma_memory_read(void *opaque, target_phys_addr_t addr,
  74                        uint8_t *buf, int len, int do_bswap)
  75 {
  76     DMAState *s = opaque;
  77     int i;
  78
  79     DPRINTF("DMA write, direction: %c, addr 0x%8.8x\n",
  80             s->dmaregs[0] & DMA_WRITE_MEM ? 'w': 'r', s->dmaregs[1]);
  81     addr |= s->dmaregs[3];
  82     if (do_bswap) {
  83         sparc_iommu_memory_read(s->iommu, addr, buf, len);
  84     } else {
  85         addr &= ~1;
  86         len &= ~1;
  87         sparc_iommu_memory_read(s->iommu, addr, buf, len);
  88         for(i = 0; i < len; i += 2) {
  89             bswap16s((uint16_t *)(buf + i));
  90         }
  91     }
  92 }
  93
  94 void ledma_memory_write(void *opaque, target_phys_addr_t addr,
  95                         uint8_t *buf, int len, int do_bswap)
  96 {
  97     DMAState *s = opaque;
  98     int l, i;
  99     uint16_t tmp_buf[32];
 100
 101     DPRINTF("DMA read, direction: %c, addr 0x%8.8x\n",
 102             s->dmaregs[0] & DMA_WRITE_MEM ? 'w': 'r', s->dmaregs[1]);
 103     addr |= s->dmaregs[3];
 104     if (do_bswap) {
 105         sparc_iommu_memory_write(s->iommu, addr, buf, len);
 106     } else {
 107         addr &= ~1;
 108         len &= ~1;
 109         while (len > 0) {
 110             l = len;
 111             if (l > sizeof(tmp_buf))
 112                 l = sizeof(tmp_buf);
 113             for(i = 0; i < l; i += 2) {
 114                 tmp_buf[i >> 1] = bswap16(*(uint16_t *)(buf + i));
 115             }
 116             sparc_iommu_memory_write(s->iommu, addr, (uint8_t *)tmp_buf, l);
 117             len -= l;
 118             buf += l;
 119             addr += l;
 120         }
 121     }
 122 }
 123
 124 static void dma_set_irq(void *opaque, int irq, int level)
 125 {
 126     DMAState *s = opaque;
 127     if (level) {
 128         DPRINTF("Raise IRQ\n");
 129         s->dmaregs[0] |= DMA_INTR;
 130         qemu_irq_raise(s->irq);
 131     } else {
 132         s->dmaregs[0] &= ~DMA_INTR;
 133         DPRINTF("Lower IRQ\n");
 134         qemu_irq_lower(s->irq);
 135     }
 136 }
 137
 138 void espdma_memory_read(void *opaque, uint8_t *buf, int len)
 139 {
 140     DMAState *s = opaque;
 141
 142     DPRINTF("DMA read, direction: %c, addr 0x%8.8x\n",
 143             s->dmaregs[0] & DMA_WRITE_MEM ? 'w': 'r', s->dmaregs[1]);
 144     sparc_iommu_memory_read(s->iommu, s->dmaregs[1], buf, len);
 145     s->dmaregs[0] |= DMA_INTR;
 146     s->dmaregs[1] += len;
 147 }
 148
 149 void espdma_memory_write(void *opaque, uint8_t *buf, int len)
 150 {
 151     DMAState *s = opaque;
 152
 153     DPRINTF("DMA write, direction: %c, addr 0x%8.8x\n",
 154             s->dmaregs[0] & DMA_WRITE_MEM ? 'w': 'r', s->dmaregs[1]);
 155     sparc_iommu_memory_write(s->iommu, s->dmaregs[1], buf, len);
 156     s->dmaregs[0] |= DMA_INTR;
 157     s->dmaregs[1] += len;
 158 }
 159
 160 static uint32_t dma_mem_readl(void *opaque, target_phys_addr_t addr)
 161 {
 162     DMAState *s = opaque;
 163     uint32_t saddr;
 164
 165     saddr = (addr & DMA_MASK) >> 2;
 166     DPRINTF("read dmareg " TARGET_FMT_plx ": 0x%8.8x\n", addr,
 167             s->dmaregs[saddr]);
 168
 169     return s->dmaregs[saddr];
 170 }
 171
 172 static void dma_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
 173 {
 174     DMAState *s = opaque;
 175     uint32_t saddr;
 176
 177     saddr = (addr & DMA_MASK) >> 2;
 178     DPRINTF("write dmareg " TARGET_FMT_plx ": 0x%8.8x -> 0x%8.8x\n", addr,
 179             s->dmaregs[saddr], val);
 180     switch (saddr) {
 181     case 0:
 182         if (!(val & DMA_INTREN)) {
 183             DPRINTF("Lower IRQ\n");
 184             qemu_irq_lower(s->irq);
 185         }
 186         if (val & DMA_RESET) {
 187             qemu_irq_raise(s->dev_reset);
 188             qemu_irq_lower(s->dev_reset);
 189         } else if (val & DMA_DRAIN_FIFO) {
 190             val &= ~DMA_DRAIN_FIFO;
 191         } else if (val == 0)
 192             val = DMA_DRAIN_FIFO;
 193         val &= 0x0fffffff;
 194         val |= DMA_VER;
 195         break;
 196     case 1:
 197         s->dmaregs[0] |= DMA_LOADED;
 198         break;
 199     default:
 200         break;
 201     }
 202     s->dmaregs[saddr] = val;
 203 }
 204
 205 static CPUReadMemoryFunc * const dma_mem_read[3] = {
 206     NULL,
 207     NULL,
 208     dma_mem_readl,
 209 };
 210
 211 static CPUWriteMemoryFunc * const dma_mem_write[3] = {
 212     NULL,
 213     NULL,
 214     dma_mem_writel,
 215 };
 216
 217 static void dma_reset(void *opaque)
 218 {
 219     DMAState *s = opaque;
 220
 221     memset(s->dmaregs, 0, DMA_SIZE);
 222     s->dmaregs[0] = DMA_VER;
 223 }
 224
 225 static const VMStateDescription vmstate_dma = {
 226     .name ="sparc32_dma",
 227     .version_id = 2,
 228     .minimum_version_id = 2,
 229     .minimum_version_id_old = 2,
 230     .fields      = (VMStateField []) {
 231         VMSTATE_UINT32_ARRAY(dmaregs, DMAState, DMA_REGS),
 232         VMSTATE_END_OF_LIST()
 233     }
 234 };
 235
 236 static int sparc32_dma_init1(SysBusDevice *dev)
 237 {
 238     DMAState *s = FROM_SYSBUS(DMAState, dev);
 239     int dma_io_memory;
 240
 241     sysbus_init_irq(dev, &s->irq);
 242
 243     dma_io_memory = cpu_register_io_memory(dma_mem_read, dma_mem_write, s);
 244     sysbus_init_mmio(dev, DMA_SIZE, dma_io_memory);
 245
 246     vmstate_register(-1, &vmstate_dma, s);
 247     qemu_register_reset(dma_reset, s);
 248
 249     qdev_init_gpio_in(&dev->qdev, dma_set_irq, 1);
 250     qdev_init_gpio_out(&dev->qdev, &s->dev_reset, 1);
 251     return 0;
 252 }
 253
 254 static SysBusDeviceInfo sparc32_dma_info = {
 255     .init = sparc32_dma_init1,
 256     .qdev.name  = "sparc32_dma",
 257     .qdev.size  = sizeof(DMAState),
 258     .qdev.props = (Property[]) {
 259         DEFINE_PROP_PTR("iommu_opaque", DMAState, iommu),
 260         DEFINE_PROP_END_OF_LIST(),
 261     }
 262 };
 263
 264 static void sparc32_dma_register_devices(void)
 265 {
 266     sysbus_register_withprop(&sparc32_dma_info);
 267 }
 268
 269 device_init(sparc32_dma_register_devices)