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/hw.h" 30 #include "hw/sparc/sparc32_dma.h" 31 #include "hw/sparc/sun4m.h" 32 #include "hw/sysbus.h" 33 #include "trace.h" 34 35 /* 36 * This is the DMA controller part of chip STP2000 (Master I/O), also 37 * produced as NCR89C100. See 38 * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C100.txt 39 * and 40 * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/DMA2.txt 41 */ 42 43 #define DMA_REGS 4 44 #define DMA_SIZE (4 * sizeof(uint32_t)) 45 /* We need the mask, because one instance of the device is not page 46 aligned (ledma, start address 0x0010) */ 47 #define DMA_MASK (DMA_SIZE - 1) 48 /* OBP says 0x20 bytes for ledma, the extras are aliased to espdma */ 49 #define DMA_ETH_SIZE (8 * sizeof(uint32_t)) 50 #define DMA_MAX_REG_OFFSET (2 * DMA_SIZE - 1) 51 52 #define DMA_VER 0xa0000000 53 #define DMA_INTR 1 54 #define DMA_INTREN 0x10 55 #define DMA_WRITE_MEM 0x100 56 #define DMA_EN 0x200 57 #define DMA_LOADED 0x04000000 58 #define DMA_DRAIN_FIFO 0x40 59 #define DMA_RESET 0x80 60 61 /* XXX SCSI and ethernet should have different read-only bit masks */ 62 #define DMA_CSR_RO_MASK 0xfe000007 63 64 #define TYPE_SPARC32_DMA "sparc32_dma" 65 #define SPARC32_DMA(obj) OBJECT_CHECK(DMAState, (obj), TYPE_SPARC32_DMA) 66 67 typedef struct DMAState DMAState; 68 69 struct DMAState { 70 SysBusDevice parent_obj; 71 72 MemoryRegion iomem; 73 uint32_t dmaregs[DMA_REGS]; 74 qemu_irq irq; 75 void *iommu; 76 qemu_irq gpio[2]; 77 uint32_t is_ledma; 78 }; 79 80 enum { 81 GPIO_RESET = 0, 82 GPIO_DMA, 83 }; 84 85 /* Note: on sparc, the lance 16 bit bus is swapped */ 86 void ledma_memory_read(void *opaque, hwaddr addr, 87 uint8_t *buf, int len, int do_bswap) 88 { 89 DMAState *s = opaque; 90 int i; 91 92 addr |= s->dmaregs[3]; 93 trace_ledma_memory_read(addr); 94 if (do_bswap) { 95 sparc_iommu_memory_read(s->iommu, addr, buf, len); 96 } else { 97 addr &= ~1; 98 len &= ~1; 99 sparc_iommu_memory_read(s->iommu, addr, buf, len); 100 for(i = 0; i < len; i += 2) { 101 bswap16s((uint16_t *)(buf + i)); 102 } 103 } 104 } 105 106 void ledma_memory_write(void *opaque, hwaddr addr, 107 uint8_t *buf, int len, int do_bswap) 108 { 109 DMAState *s = opaque; 110 int l, i; 111 uint16_t tmp_buf[32]; 112 113 addr |= s->dmaregs[3]; 114 trace_ledma_memory_write(addr); 115 if (do_bswap) { 116 sparc_iommu_memory_write(s->iommu, addr, buf, len); 117 } else { 118 addr &= ~1; 119 len &= ~1; 120 while (len > 0) { 121 l = len; 122 if (l > sizeof(tmp_buf)) 123 l = sizeof(tmp_buf); 124 for(i = 0; i < l; i += 2) { 125 tmp_buf[i >> 1] = bswap16(*(uint16_t *)(buf + i)); 126 } 127 sparc_iommu_memory_write(s->iommu, addr, (uint8_t *)tmp_buf, l); 128 len -= l; 129 buf += l; 130 addr += l; 131 } 132 } 133 } 134 135 static void dma_set_irq(void *opaque, int irq, int level) 136 { 137 DMAState *s = opaque; 138 if (level) { 139 s->dmaregs[0] |= DMA_INTR; 140 if (s->dmaregs[0] & DMA_INTREN) { 141 trace_sparc32_dma_set_irq_raise(); 142 qemu_irq_raise(s->irq); 143 } 144 } else { 145 if (s->dmaregs[0] & DMA_INTR) { 146 s->dmaregs[0] &= ~DMA_INTR; 147 if (s->dmaregs[0] & DMA_INTREN) { 148 trace_sparc32_dma_set_irq_lower(); 149 qemu_irq_lower(s->irq); 150 } 151 } 152 } 153 } 154 155 void espdma_memory_read(void *opaque, uint8_t *buf, int len) 156 { 157 DMAState *s = opaque; 158 159 trace_espdma_memory_read(s->dmaregs[1]); 160 sparc_iommu_memory_read(s->iommu, s->dmaregs[1], buf, len); 161 s->dmaregs[1] += len; 162 } 163 164 void espdma_memory_write(void *opaque, uint8_t *buf, int len) 165 { 166 DMAState *s = opaque; 167 168 trace_espdma_memory_write(s->dmaregs[1]); 169 sparc_iommu_memory_write(s->iommu, s->dmaregs[1], buf, len); 170 s->dmaregs[1] += len; 171 } 172 173 static uint64_t dma_mem_read(void *opaque, hwaddr addr, 174 unsigned size) 175 { 176 DMAState *s = opaque; 177 uint32_t saddr; 178 179 if (s->is_ledma && (addr > DMA_MAX_REG_OFFSET)) { 180 /* aliased to espdma, but we can't get there from here */ 181 /* buggy driver if using undocumented behavior, just return 0 */ 182 trace_sparc32_dma_mem_readl(addr, 0); 183 return 0; 184 } 185 saddr = (addr & DMA_MASK) >> 2; 186 trace_sparc32_dma_mem_readl(addr, s->dmaregs[saddr]); 187 return s->dmaregs[saddr]; 188 } 189 190 static void dma_mem_write(void *opaque, hwaddr addr, 191 uint64_t val, unsigned size) 192 { 193 DMAState *s = opaque; 194 uint32_t saddr; 195 196 if (s->is_ledma && (addr > DMA_MAX_REG_OFFSET)) { 197 /* aliased to espdma, but we can't get there from here */ 198 trace_sparc32_dma_mem_writel(addr, 0, val); 199 return; 200 } 201 saddr = (addr & DMA_MASK) >> 2; 202 trace_sparc32_dma_mem_writel(addr, s->dmaregs[saddr], val); 203 switch (saddr) { 204 case 0: 205 if (val & DMA_INTREN) { 206 if (s->dmaregs[0] & DMA_INTR) { 207 trace_sparc32_dma_set_irq_raise(); 208 qemu_irq_raise(s->irq); 209 } 210 } else { 211 if (s->dmaregs[0] & (DMA_INTR | DMA_INTREN)) { 212 trace_sparc32_dma_set_irq_lower(); 213 qemu_irq_lower(s->irq); 214 } 215 } 216 if (val & DMA_RESET) { 217 qemu_irq_raise(s->gpio[GPIO_RESET]); 218 qemu_irq_lower(s->gpio[GPIO_RESET]); 219 } else if (val & DMA_DRAIN_FIFO) { 220 val &= ~DMA_DRAIN_FIFO; 221 } else if (val == 0) 222 val = DMA_DRAIN_FIFO; 223 224 if (val & DMA_EN && !(s->dmaregs[0] & DMA_EN)) { 225 trace_sparc32_dma_enable_raise(); 226 qemu_irq_raise(s->gpio[GPIO_DMA]); 227 } else if (!(val & DMA_EN) && !!(s->dmaregs[0] & DMA_EN)) { 228 trace_sparc32_dma_enable_lower(); 229 qemu_irq_lower(s->gpio[GPIO_DMA]); 230 } 231 232 val &= ~DMA_CSR_RO_MASK; 233 val |= DMA_VER; 234 s->dmaregs[0] = (s->dmaregs[0] & DMA_CSR_RO_MASK) | val; 235 break; 236 case 1: 237 s->dmaregs[0] |= DMA_LOADED; 238 /* fall through */ 239 default: 240 s->dmaregs[saddr] = val; 241 break; 242 } 243 } 244 245 static const MemoryRegionOps dma_mem_ops = { 246 .read = dma_mem_read, 247 .write = dma_mem_write, 248 .endianness = DEVICE_NATIVE_ENDIAN, 249 .valid = { 250 .min_access_size = 4, 251 .max_access_size = 4, 252 }, 253 }; 254 255 static void dma_reset(DeviceState *d) 256 { 257 DMAState *s = SPARC32_DMA(d); 258 259 memset(s->dmaregs, 0, DMA_SIZE); 260 s->dmaregs[0] = DMA_VER; 261 } 262 263 static const VMStateDescription vmstate_dma = { 264 .name ="sparc32_dma", 265 .version_id = 2, 266 .minimum_version_id = 2, 267 .fields = (VMStateField[]) { 268 VMSTATE_UINT32_ARRAY(dmaregs, DMAState, DMA_REGS), 269 VMSTATE_END_OF_LIST() 270 } 271 }; 272 273 static int sparc32_dma_init1(SysBusDevice *sbd) 274 { 275 DeviceState *dev = DEVICE(sbd); 276 DMAState *s = SPARC32_DMA(dev); 277 int reg_size; 278 279 sysbus_init_irq(sbd, &s->irq); 280 281 reg_size = s->is_ledma ? DMA_ETH_SIZE : DMA_SIZE; 282 memory_region_init_io(&s->iomem, OBJECT(s), &dma_mem_ops, s, 283 "dma", reg_size); 284 sysbus_init_mmio(sbd, &s->iomem); 285 286 qdev_init_gpio_in(dev, dma_set_irq, 1); 287 qdev_init_gpio_out(dev, s->gpio, 2); 288 289 return 0; 290 } 291 292 static Property sparc32_dma_properties[] = { 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 static void sparc32_dma_class_init(ObjectClass *klass, void *data) 299 { 300 DeviceClass *dc = DEVICE_CLASS(klass); 301 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); 302 303 k->init = sparc32_dma_init1; 304 dc->reset = dma_reset; 305 dc->vmsd = &vmstate_dma; 306 dc->props = sparc32_dma_properties; 307 /* Reason: pointer property "iommu_opaque" */ 308 dc->cannot_instantiate_with_device_add_yet = true; 309 } 310 311 static const TypeInfo sparc32_dma_info = { 312 .name = TYPE_SPARC32_DMA, 313 .parent = TYPE_SYS_BUS_DEVICE, 314 .instance_size = sizeof(DMAState), 315 .class_init = sparc32_dma_class_init, 316 }; 317 318 static void sparc32_dma_register_types(void) 319 { 320 type_register_static(&sparc32_dma_info); 321 } 322 323 type_init(sparc32_dma_register_types) 324