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/hw.h" 29 #include "hw/sparc/sparc32_dma.h" 30 #include "hw/sparc/sun4m.h" 31 #include "hw/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 #define TYPE_SPARC32_DMA "sparc32_dma" 64 #define SPARC32_DMA(obj) OBJECT_CHECK(DMAState, (obj), TYPE_SPARC32_DMA) 65 66 typedef struct DMAState DMAState; 67 68 struct DMAState { 69 SysBusDevice parent_obj; 70 71 MemoryRegion iomem; 72 uint32_t dmaregs[DMA_REGS]; 73 qemu_irq irq; 74 void *iommu; 75 qemu_irq gpio[2]; 76 uint32_t is_ledma; 77 }; 78 79 enum { 80 GPIO_RESET = 0, 81 GPIO_DMA, 82 }; 83 84 /* Note: on sparc, the lance 16 bit bus is swapped */ 85 void ledma_memory_read(void *opaque, hwaddr addr, 86 uint8_t *buf, int len, int do_bswap) 87 { 88 DMAState *s = opaque; 89 int i; 90 91 addr |= s->dmaregs[3]; 92 trace_ledma_memory_read(addr); 93 if (do_bswap) { 94 sparc_iommu_memory_read(s->iommu, addr, buf, len); 95 } else { 96 addr &= ~1; 97 len &= ~1; 98 sparc_iommu_memory_read(s->iommu, addr, buf, len); 99 for(i = 0; i < len; i += 2) { 100 bswap16s((uint16_t *)(buf + i)); 101 } 102 } 103 } 104 105 void ledma_memory_write(void *opaque, hwaddr addr, 106 uint8_t *buf, int len, int do_bswap) 107 { 108 DMAState *s = opaque; 109 int l, i; 110 uint16_t tmp_buf[32]; 111 112 addr |= s->dmaregs[3]; 113 trace_ledma_memory_write(addr); 114 if (do_bswap) { 115 sparc_iommu_memory_write(s->iommu, addr, buf, len); 116 } else { 117 addr &= ~1; 118 len &= ~1; 119 while (len > 0) { 120 l = len; 121 if (l > sizeof(tmp_buf)) 122 l = sizeof(tmp_buf); 123 for(i = 0; i < l; i += 2) { 124 tmp_buf[i >> 1] = bswap16(*(uint16_t *)(buf + i)); 125 } 126 sparc_iommu_memory_write(s->iommu, addr, (uint8_t *)tmp_buf, l); 127 len -= l; 128 buf += l; 129 addr += l; 130 } 131 } 132 } 133 134 static void dma_set_irq(void *opaque, int irq, int level) 135 { 136 DMAState *s = opaque; 137 if (level) { 138 s->dmaregs[0] |= DMA_INTR; 139 if (s->dmaregs[0] & DMA_INTREN) { 140 trace_sparc32_dma_set_irq_raise(); 141 qemu_irq_raise(s->irq); 142 } 143 } else { 144 if (s->dmaregs[0] & DMA_INTR) { 145 s->dmaregs[0] &= ~DMA_INTR; 146 if (s->dmaregs[0] & DMA_INTREN) { 147 trace_sparc32_dma_set_irq_lower(); 148 qemu_irq_lower(s->irq); 149 } 150 } 151 } 152 } 153 154 void espdma_memory_read(void *opaque, uint8_t *buf, int len) 155 { 156 DMAState *s = opaque; 157 158 trace_espdma_memory_read(s->dmaregs[1]); 159 sparc_iommu_memory_read(s->iommu, s->dmaregs[1], buf, len); 160 s->dmaregs[1] += len; 161 } 162 163 void espdma_memory_write(void *opaque, uint8_t *buf, int len) 164 { 165 DMAState *s = opaque; 166 167 trace_espdma_memory_write(s->dmaregs[1]); 168 sparc_iommu_memory_write(s->iommu, s->dmaregs[1], buf, len); 169 s->dmaregs[1] += len; 170 } 171 172 static uint64_t dma_mem_read(void *opaque, hwaddr addr, 173 unsigned size) 174 { 175 DMAState *s = opaque; 176 uint32_t saddr; 177 178 if (s->is_ledma && (addr > DMA_MAX_REG_OFFSET)) { 179 /* aliased to espdma, but we can't get there from here */ 180 /* buggy driver if using undocumented behavior, just return 0 */ 181 trace_sparc32_dma_mem_readl(addr, 0); 182 return 0; 183 } 184 saddr = (addr & DMA_MASK) >> 2; 185 trace_sparc32_dma_mem_readl(addr, s->dmaregs[saddr]); 186 return s->dmaregs[saddr]; 187 } 188 189 static void dma_mem_write(void *opaque, hwaddr addr, 190 uint64_t val, unsigned size) 191 { 192 DMAState *s = opaque; 193 uint32_t saddr; 194 195 if (s->is_ledma && (addr > DMA_MAX_REG_OFFSET)) { 196 /* aliased to espdma, but we can't get there from here */ 197 trace_sparc32_dma_mem_writel(addr, 0, val); 198 return; 199 } 200 saddr = (addr & DMA_MASK) >> 2; 201 trace_sparc32_dma_mem_writel(addr, s->dmaregs[saddr], val); 202 switch (saddr) { 203 case 0: 204 if (val & DMA_INTREN) { 205 if (s->dmaregs[0] & DMA_INTR) { 206 trace_sparc32_dma_set_irq_raise(); 207 qemu_irq_raise(s->irq); 208 } 209 } else { 210 if (s->dmaregs[0] & (DMA_INTR | DMA_INTREN)) { 211 trace_sparc32_dma_set_irq_lower(); 212 qemu_irq_lower(s->irq); 213 } 214 } 215 if (val & DMA_RESET) { 216 qemu_irq_raise(s->gpio[GPIO_RESET]); 217 qemu_irq_lower(s->gpio[GPIO_RESET]); 218 } else if (val & DMA_DRAIN_FIFO) { 219 val &= ~DMA_DRAIN_FIFO; 220 } else if (val == 0) 221 val = DMA_DRAIN_FIFO; 222 223 if (val & DMA_EN && !(s->dmaregs[0] & DMA_EN)) { 224 trace_sparc32_dma_enable_raise(); 225 qemu_irq_raise(s->gpio[GPIO_DMA]); 226 } else if (!(val & DMA_EN) && !!(s->dmaregs[0] & DMA_EN)) { 227 trace_sparc32_dma_enable_lower(); 228 qemu_irq_lower(s->gpio[GPIO_DMA]); 229 } 230 231 val &= ~DMA_CSR_RO_MASK; 232 val |= DMA_VER; 233 s->dmaregs[0] = (s->dmaregs[0] & DMA_CSR_RO_MASK) | val; 234 break; 235 case 1: 236 s->dmaregs[0] |= DMA_LOADED; 237 /* fall through */ 238 default: 239 s->dmaregs[saddr] = val; 240 break; 241 } 242 } 243 244 static const MemoryRegionOps dma_mem_ops = { 245 .read = dma_mem_read, 246 .write = dma_mem_write, 247 .endianness = DEVICE_NATIVE_ENDIAN, 248 .valid = { 249 .min_access_size = 4, 250 .max_access_size = 4, 251 }, 252 }; 253 254 static void dma_reset(DeviceState *d) 255 { 256 DMAState *s = SPARC32_DMA(d); 257 258 memset(s->dmaregs, 0, DMA_SIZE); 259 s->dmaregs[0] = DMA_VER; 260 } 261 262 static const VMStateDescription vmstate_dma = { 263 .name ="sparc32_dma", 264 .version_id = 2, 265 .minimum_version_id = 2, 266 .minimum_version_id_old = 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