/* * 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.h" #include "sparc32_dma.h" #include "sun4m.h" #include "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, target_phys_addr_t 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, target_phys_addr_t 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, target_phys_addr_t 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, target_phys_addr_t 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 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)