| /* |
| * QEMU Sparc32 DMA controller emulation |
| * |
| * Copyright (c) 2006 Fabrice Bellard |
| * |
| * Modifications: |
| * 2010-Feb-14 Artyom Tarasenko : reworked irq generation |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| |
| #include "hw/hw.h" |
| #include "hw/sparc32_dma.h" |
| #include "hw/sun4m.h" |
| #include "hw/sysbus.h" |
| #include "trace.h" |
| |
| /* |
| * This is the DMA controller part of chip STP2000 (Master I/O), also |
| * produced as NCR89C100. See |
| * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C100.txt |
| * and |
| * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/DMA2.txt |
| */ |
| |
| #define DMA_REGS 4 |
| #define DMA_SIZE (4 * sizeof(uint32_t)) |
| /* We need the mask, because one instance of the device is not page |
| aligned (ledma, start address 0x0010) */ |
| #define DMA_MASK (DMA_SIZE - 1) |
| /* OBP says 0x20 bytes for ledma, the extras are aliased to espdma */ |
| #define DMA_ETH_SIZE (8 * sizeof(uint32_t)) |
| #define DMA_MAX_REG_OFFSET (2 * DMA_SIZE - 1) |
| |
| #define DMA_VER 0xa0000000 |
| #define DMA_INTR 1 |
| #define DMA_INTREN 0x10 |
| #define DMA_WRITE_MEM 0x100 |
| #define DMA_EN 0x200 |
| #define DMA_LOADED 0x04000000 |
| #define DMA_DRAIN_FIFO 0x40 |
| #define DMA_RESET 0x80 |
| |
| /* XXX SCSI and ethernet should have different read-only bit masks */ |
| #define DMA_CSR_RO_MASK 0xfe000007 |
| |
| typedef struct DMAState DMAState; |
| |
| struct DMAState { |
| SysBusDevice busdev; |
| MemoryRegion iomem; |
| uint32_t dmaregs[DMA_REGS]; |
| qemu_irq irq; |
| void *iommu; |
| qemu_irq gpio[2]; |
| uint32_t is_ledma; |
| }; |
| |
| enum { |
| GPIO_RESET = 0, |
| GPIO_DMA, |
| }; |
| |
| /* Note: on sparc, the lance 16 bit bus is swapped */ |
| void ledma_memory_read(void *opaque, hwaddr addr, |
| uint8_t *buf, int len, int do_bswap) |
| { |
| DMAState *s = opaque; |
| int i; |
| |
| addr |= s->dmaregs[3]; |
| trace_ledma_memory_read(addr); |
| if (do_bswap) { |
| sparc_iommu_memory_read(s->iommu, addr, buf, len); |
| } else { |
| addr &= ~1; |
| len &= ~1; |
| sparc_iommu_memory_read(s->iommu, addr, buf, len); |
| for(i = 0; i < len; i += 2) { |
| bswap16s((uint16_t *)(buf + i)); |
| } |
| } |
| } |
| |
| void ledma_memory_write(void *opaque, hwaddr addr, |
| uint8_t *buf, int len, int do_bswap) |
| { |
| DMAState *s = opaque; |
| int l, i; |
| uint16_t tmp_buf[32]; |
| |
| addr |= s->dmaregs[3]; |
| trace_ledma_memory_write(addr); |
| if (do_bswap) { |
| sparc_iommu_memory_write(s->iommu, addr, buf, len); |
| } else { |
| addr &= ~1; |
| len &= ~1; |
| while (len > 0) { |
| l = len; |
| if (l > sizeof(tmp_buf)) |
| l = sizeof(tmp_buf); |
| for(i = 0; i < l; i += 2) { |
| tmp_buf[i >> 1] = bswap16(*(uint16_t *)(buf + i)); |
| } |
| sparc_iommu_memory_write(s->iommu, addr, (uint8_t *)tmp_buf, l); |
| len -= l; |
| buf += l; |
| addr += l; |
| } |
| } |
| } |
| |
| static void dma_set_irq(void *opaque, int irq, int level) |
| { |
| DMAState *s = opaque; |
| if (level) { |
| s->dmaregs[0] |= DMA_INTR; |
| if (s->dmaregs[0] & DMA_INTREN) { |
| trace_sparc32_dma_set_irq_raise(); |
| qemu_irq_raise(s->irq); |
| } |
| } else { |
| if (s->dmaregs[0] & DMA_INTR) { |
| s->dmaregs[0] &= ~DMA_INTR; |
| if (s->dmaregs[0] & DMA_INTREN) { |
| trace_sparc32_dma_set_irq_lower(); |
| qemu_irq_lower(s->irq); |
| } |
| } |
| } |
| } |
| |
| void espdma_memory_read(void *opaque, uint8_t *buf, int len) |
| { |
| DMAState *s = opaque; |
| |
| trace_espdma_memory_read(s->dmaregs[1]); |
| sparc_iommu_memory_read(s->iommu, s->dmaregs[1], buf, len); |
| s->dmaregs[1] += len; |
| } |
| |
| void espdma_memory_write(void *opaque, uint8_t *buf, int len) |
| { |
| DMAState *s = opaque; |
| |
| trace_espdma_memory_write(s->dmaregs[1]); |
| sparc_iommu_memory_write(s->iommu, s->dmaregs[1], buf, len); |
| s->dmaregs[1] += len; |
| } |
| |
| static uint64_t dma_mem_read(void *opaque, hwaddr addr, |
| unsigned size) |
| { |
| DMAState *s = opaque; |
| uint32_t saddr; |
| |
| if (s->is_ledma && (addr > DMA_MAX_REG_OFFSET)) { |
| /* aliased to espdma, but we can't get there from here */ |
| /* buggy driver if using undocumented behavior, just return 0 */ |
| trace_sparc32_dma_mem_readl(addr, 0); |
| return 0; |
| } |
| saddr = (addr & DMA_MASK) >> 2; |
| trace_sparc32_dma_mem_readl(addr, s->dmaregs[saddr]); |
| return s->dmaregs[saddr]; |
| } |
| |
| static void dma_mem_write(void *opaque, hwaddr addr, |
| uint64_t val, unsigned size) |
| { |
| DMAState *s = opaque; |
| uint32_t saddr; |
| |
| if (s->is_ledma && (addr > DMA_MAX_REG_OFFSET)) { |
| /* aliased to espdma, but we can't get there from here */ |
| trace_sparc32_dma_mem_writel(addr, 0, val); |
| return; |
| } |
| saddr = (addr & DMA_MASK) >> 2; |
| trace_sparc32_dma_mem_writel(addr, s->dmaregs[saddr], val); |
| switch (saddr) { |
| case 0: |
| if (val & DMA_INTREN) { |
| if (s->dmaregs[0] & DMA_INTR) { |
| trace_sparc32_dma_set_irq_raise(); |
| qemu_irq_raise(s->irq); |
| } |
| } else { |
| if (s->dmaregs[0] & (DMA_INTR | DMA_INTREN)) { |
| trace_sparc32_dma_set_irq_lower(); |
| qemu_irq_lower(s->irq); |
| } |
| } |
| if (val & DMA_RESET) { |
| qemu_irq_raise(s->gpio[GPIO_RESET]); |
| qemu_irq_lower(s->gpio[GPIO_RESET]); |
| } else if (val & DMA_DRAIN_FIFO) { |
| val &= ~DMA_DRAIN_FIFO; |
| } else if (val == 0) |
| val = DMA_DRAIN_FIFO; |
| |
| if (val & DMA_EN && !(s->dmaregs[0] & DMA_EN)) { |
| trace_sparc32_dma_enable_raise(); |
| qemu_irq_raise(s->gpio[GPIO_DMA]); |
| } else if (!(val & DMA_EN) && !!(s->dmaregs[0] & DMA_EN)) { |
| trace_sparc32_dma_enable_lower(); |
| qemu_irq_lower(s->gpio[GPIO_DMA]); |
| } |
| |
| val &= ~DMA_CSR_RO_MASK; |
| val |= DMA_VER; |
| s->dmaregs[0] = (s->dmaregs[0] & DMA_CSR_RO_MASK) | val; |
| break; |
| case 1: |
| s->dmaregs[0] |= DMA_LOADED; |
| /* fall through */ |
| default: |
| s->dmaregs[saddr] = val; |
| break; |
| } |
| } |
| |
| static const MemoryRegionOps dma_mem_ops = { |
| .read = dma_mem_read, |
| .write = dma_mem_write, |
| .endianness = DEVICE_NATIVE_ENDIAN, |
| .valid = { |
| .min_access_size = 4, |
| .max_access_size = 4, |
| }, |
| }; |
| |
| static void dma_reset(DeviceState *d) |
| { |
| DMAState *s = container_of(d, DMAState, busdev.qdev); |
| |
| memset(s->dmaregs, 0, DMA_SIZE); |
| s->dmaregs[0] = DMA_VER; |
| } |
| |
| static const VMStateDescription vmstate_dma = { |
| .name ="sparc32_dma", |
| .version_id = 2, |
| .minimum_version_id = 2, |
| .minimum_version_id_old = 2, |
| .fields = (VMStateField []) { |
| VMSTATE_UINT32_ARRAY(dmaregs, DMAState, DMA_REGS), |
| VMSTATE_END_OF_LIST() |
| } |
| }; |
| |
| static int sparc32_dma_init1(SysBusDevice *dev) |
| { |
| DMAState *s = FROM_SYSBUS(DMAState, dev); |
| int reg_size; |
| |
| sysbus_init_irq(dev, &s->irq); |
| |
| reg_size = s->is_ledma ? DMA_ETH_SIZE : DMA_SIZE; |
| memory_region_init_io(&s->iomem, &dma_mem_ops, s, "dma", reg_size); |
| sysbus_init_mmio(dev, &s->iomem); |
| |
| qdev_init_gpio_in(&dev->qdev, dma_set_irq, 1); |
| qdev_init_gpio_out(&dev->qdev, s->gpio, 2); |
| |
| return 0; |
| } |
| |
| static Property sparc32_dma_properties[] = { |
| DEFINE_PROP_PTR("iommu_opaque", DMAState, iommu), |
| DEFINE_PROP_UINT32("is_ledma", DMAState, is_ledma, 0), |
| DEFINE_PROP_END_OF_LIST(), |
| }; |
| |
| static void sparc32_dma_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); |
| |
| k->init = sparc32_dma_init1; |
| dc->reset = dma_reset; |
| dc->vmsd = &vmstate_dma; |
| dc->props = sparc32_dma_properties; |
| } |
| |
| static const TypeInfo sparc32_dma_info = { |
| .name = "sparc32_dma", |
| .parent = TYPE_SYS_BUS_DEVICE, |
| .instance_size = sizeof(DMAState), |
| .class_init = sparc32_dma_class_init, |
| }; |
| |
| static void sparc32_dma_register_types(void) |
| { |
| type_register_static(&sparc32_dma_info); |
| } |
| |
| type_init(sparc32_dma_register_types) |