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 /* OBP says 0x20 bytes for ledma, the extras are aliased to espdma */
  48 #define DMA_ETH_SIZE (8 * sizeof(uint32_t))
  49 #define DMA_MAX_REG_OFFSET (2 * DMA_SIZE - 1)
  50
  51 #define DMA_VER 0xa0000000
  52 #define DMA_INTR 1
  53 #define DMA_INTREN 0x10
  54 #define DMA_WRITE_MEM 0x100
  55 #define DMA_EN 0x200
  56 #define DMA_LOADED 0x04000000
  57 #define DMA_DRAIN_FIFO 0x40
  58 #define DMA_RESET 0x80
  59
  60 /* XXX SCSI and ethernet should have different read-only bit masks */
  61 #define DMA_CSR_RO_MASK 0xfe000007
  62
  63 typedef struct DMAState DMAState;
  64
  65 struct DMAState {
  66     SysBusDevice busdev;
  67     MemoryRegion iomem;
  68     uint32_t dmaregs[DMA_REGS];
  69     qemu_irq irq;
  70     void *iommu;
  71     qemu_irq gpio[2];
  72     uint32_t is_ledma;
  73 };
  74
  75 enum {
  76     GPIO_RESET = 0,
  77     GPIO_DMA,
  78 };
  79
  80 /* Note: on sparc, the lance 16 bit bus is swapped */
  81 void ledma_memory_read(void *opaque, target_phys_addr_t addr,
  82                        uint8_t *buf, int len, int do_bswap)
  83 {
  84     DMAState *s = opaque;
  85     int i;
  86
  87     addr |= s->dmaregs[3];
  88     trace_ledma_memory_read(addr);
  89     if (do_bswap) {
  90         sparc_iommu_memory_read(s->iommu, addr, buf, len);
  91     } else {
  92         addr &= ~1;
  93         len &= ~1;
  94         sparc_iommu_memory_read(s->iommu, addr, buf, len);
  95         for(i = 0; i < len; i += 2) {
  96             bswap16s((uint16_t *)(buf + i));
  97         }
  98     }
  99 }
 100
 101 void ledma_memory_write(void *opaque, target_phys_addr_t addr,
 102                         uint8_t *buf, int len, int do_bswap)
 103 {
 104     DMAState *s = opaque;
 105     int l, i;
 106     uint16_t tmp_buf[32];
 107
 108     addr |= s->dmaregs[3];
 109     trace_ledma_memory_write(addr);
 110     if (do_bswap) {
 111         sparc_iommu_memory_write(s->iommu, addr, buf, len);
 112     } else {
 113         addr &= ~1;
 114         len &= ~1;
 115         while (len > 0) {
 116             l = len;
 117             if (l > sizeof(tmp_buf))
 118                 l = sizeof(tmp_buf);
 119             for(i = 0; i < l; i += 2) {
 120                 tmp_buf[i >> 1] = bswap16(*(uint16_t *)(buf + i));
 121             }
 122             sparc_iommu_memory_write(s->iommu, addr, (uint8_t *)tmp_buf, l);
 123             len -= l;
 124             buf += l;
 125             addr += l;
 126         }
 127     }
 128 }
 129
 130 static void dma_set_irq(void *opaque, int irq, int level)
 131 {
 132     DMAState *s = opaque;
 133     if (level) {
 134         s->dmaregs[0] |= DMA_INTR;
 135         if (s->dmaregs[0] & DMA_INTREN) {
 136             trace_sparc32_dma_set_irq_raise();
 137             qemu_irq_raise(s->irq);
 138         }
 139     } else {
 140         if (s->dmaregs[0] & DMA_INTR) {
 141             s->dmaregs[0] &= ~DMA_INTR;
 142             if (s->dmaregs[0] & DMA_INTREN) {
 143                 trace_sparc32_dma_set_irq_lower();
 144                 qemu_irq_lower(s->irq);
 145             }
 146         }
 147     }
 148 }
 149
 150 void espdma_memory_read(void *opaque, uint8_t *buf, int len)
 151 {
 152     DMAState *s = opaque;
 153
 154     trace_espdma_memory_read(s->dmaregs[1]);
 155     sparc_iommu_memory_read(s->iommu, s->dmaregs[1], buf, len);
 156     s->dmaregs[1] += len;
 157 }
 158
 159 void espdma_memory_write(void *opaque, uint8_t *buf, int len)
 160 {
 161     DMAState *s = opaque;
 162
 163     trace_espdma_memory_write(s->dmaregs[1]);
 164     sparc_iommu_memory_write(s->iommu, s->dmaregs[1], buf, len);
 165     s->dmaregs[1] += len;
 166 }
 167
 168 static uint64_t dma_mem_read(void *opaque, target_phys_addr_t addr,
 169                              unsigned size)
 170 {
 171     DMAState *s = opaque;
 172     uint32_t saddr;
 173
 174     if (s->is_ledma && (addr > DMA_MAX_REG_OFFSET)) {
 175         /* aliased to espdma, but we can't get there from here */
 176         /* buggy driver if using undocumented behavior, just return 0 */
 177         trace_sparc32_dma_mem_readl(addr, 0);
 178         return 0;
 179     }
 180     saddr = (addr & DMA_MASK) >> 2;
 181     trace_sparc32_dma_mem_readl(addr, s->dmaregs[saddr]);
 182     return s->dmaregs[saddr];
 183 }
 184
 185 static void dma_mem_write(void *opaque, target_phys_addr_t addr,
 186                           uint64_t val, unsigned size)
 187 {
 188     DMAState *s = opaque;
 189     uint32_t saddr;
 190
 191     if (s->is_ledma && (addr > DMA_MAX_REG_OFFSET)) {
 192         /* aliased to espdma, but we can't get there from here */
 193         trace_sparc32_dma_mem_writel(addr, 0, val);
 194         return;
 195     }
 196     saddr = (addr & DMA_MASK) >> 2;
 197     trace_sparc32_dma_mem_writel(addr, s->dmaregs[saddr], val);
 198     switch (saddr) {
 199     case 0:
 200         if (val & DMA_INTREN) {
 201             if (s->dmaregs[0] & DMA_INTR) {
 202                 trace_sparc32_dma_set_irq_raise();
 203                 qemu_irq_raise(s->irq);
 204             }
 205         } else {
 206             if (s->dmaregs[0] & (DMA_INTR | DMA_INTREN)) {
 207                 trace_sparc32_dma_set_irq_lower();
 208                 qemu_irq_lower(s->irq);
 209             }
 210         }
 211         if (val & DMA_RESET) {
 212             qemu_irq_raise(s->gpio[GPIO_RESET]);
 213             qemu_irq_lower(s->gpio[GPIO_RESET]);
 214         } else if (val & DMA_DRAIN_FIFO) {
 215             val &= ~DMA_DRAIN_FIFO;
 216         } else if (val == 0)
 217             val = DMA_DRAIN_FIFO;
 218
 219         if (val & DMA_EN && !(s->dmaregs[0] & DMA_EN)) {
 220             trace_sparc32_dma_enable_raise();
 221             qemu_irq_raise(s->gpio[GPIO_DMA]);
 222         } else if (!(val & DMA_EN) && !!(s->dmaregs[0] & DMA_EN)) {
 223             trace_sparc32_dma_enable_lower();
 224             qemu_irq_lower(s->gpio[GPIO_DMA]);
 225         }
 226
 227         val &= ~DMA_CSR_RO_MASK;
 228         val |= DMA_VER;
 229         s->dmaregs[0] = (s->dmaregs[0] & DMA_CSR_RO_MASK) | val;
 230         break;
 231     case 1:
 232         s->dmaregs[0] |= DMA_LOADED;
 233         /* fall through */
 234     default:
 235         s->dmaregs[saddr] = val;
 236         break;
 237     }
 238 }
 239
 240 static const MemoryRegionOps dma_mem_ops = {
 241     .read = dma_mem_read,
 242     .write = dma_mem_write,
 243     .endianness = DEVICE_NATIVE_ENDIAN,
 244     .valid = {
 245         .min_access_size = 4,
 246         .max_access_size = 4,
 247     },
 248 };
 249
 250 static void dma_reset(DeviceState *d)
 251 {
 252     DMAState *s = container_of(d, DMAState, busdev.qdev);
 253
 254     memset(s->dmaregs, 0, DMA_SIZE);
 255     s->dmaregs[0] = DMA_VER;
 256 }
 257
 258 static const VMStateDescription vmstate_dma = {
 259     .name ="sparc32_dma",
 260     .version_id = 2,
 261     .minimum_version_id = 2,
 262     .minimum_version_id_old = 2,
 263     .fields      = (VMStateField []) {
 264         VMSTATE_UINT32_ARRAY(dmaregs, DMAState, DMA_REGS),
 265         VMSTATE_END_OF_LIST()
 266     }
 267 };
 268
 269 static int sparc32_dma_init1(SysBusDevice *dev)
 270 {
 271     DMAState *s = FROM_SYSBUS(DMAState, dev);
 272     int reg_size;
 273
 274     sysbus_init_irq(dev, &s->irq);
 275
 276     reg_size = s->is_ledma ? DMA_ETH_SIZE : DMA_SIZE;
 277     memory_region_init_io(&s->iomem, &dma_mem_ops, s, "dma", reg_size);
 278     sysbus_init_mmio(dev, &s->iomem);
 279
 280     qdev_init_gpio_in(&dev->qdev, dma_set_irq, 1);
 281     qdev_init_gpio_out(&dev->qdev, s->gpio, 2);
 282
 283     return 0;
 284 }
 285
 286 static SysBusDeviceInfo sparc32_dma_info = {
 287     .init = sparc32_dma_init1,
 288     .qdev.name  = "sparc32_dma",
 289     .qdev.size  = sizeof(DMAState),
 290     .qdev.vmsd  = &vmstate_dma,
 291     .qdev.reset = dma_reset,
 292     .qdev.props = (Property[]) {
 293         DEFINE_PROP_PTR("iommu_opaque", DMAState, iommu),
 294         DEFINE_PROP_UINT32("is_ledma", DMAState, is_ledma, 0),
 295         DEFINE_PROP_END_OF_LIST(),
 296     }
 297 };
 298
 299 static void sparc32_dma_register_devices(void)
 300 {
 301     sysbus_register_withprop(&sparc32_dma_info);
 302 }
 303
 304 device_init(sparc32_dma_register_devices)