1ea3489963
This patch adds puv3 dma (Direct Memory Access) support, include dma device simulation for kernel booting. v1->v2: Add initialization to ret in puv3_dma_read. Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
110 lines
2.5 KiB
C
110 lines
2.5 KiB
C
/*
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* DMA device simulation in PKUnity SoC
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*
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* Copyright (C) 2010-2012 Guan Xuetao
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation, or any later version.
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* See the COPYING file in the top-level directory.
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*/
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#include "hw.h"
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#include "sysbus.h"
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#undef DEBUG_PUV3
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#include "puv3.h"
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#define PUV3_DMA_CH_NR (6)
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#define PUV3_DMA_CH_MASK (0xff)
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#define PUV3_DMA_CH(offset) ((offset) >> 8)
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typedef struct {
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SysBusDevice busdev;
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MemoryRegion iomem;
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uint32_t reg_CFG[PUV3_DMA_CH_NR];
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} PUV3DMAState;
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static uint64_t puv3_dma_read(void *opaque, target_phys_addr_t offset,
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unsigned size)
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{
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PUV3DMAState *s = opaque;
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uint32_t ret = 0;
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assert(PUV3_DMA_CH(offset) < PUV3_DMA_CH_NR);
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switch (offset & PUV3_DMA_CH_MASK) {
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case 0x10:
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ret = s->reg_CFG[PUV3_DMA_CH(offset)];
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break;
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default:
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DPRINTF("Bad offset 0x%x\n", offset);
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}
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DPRINTF("offset 0x%x, value 0x%x\n", offset, ret);
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return ret;
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}
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static void puv3_dma_write(void *opaque, target_phys_addr_t offset,
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uint64_t value, unsigned size)
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{
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PUV3DMAState *s = opaque;
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assert(PUV3_DMA_CH(offset) < PUV3_DMA_CH_NR);
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switch (offset & PUV3_DMA_CH_MASK) {
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case 0x10:
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s->reg_CFG[PUV3_DMA_CH(offset)] = value;
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break;
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default:
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DPRINTF("Bad offset 0x%x\n", offset);
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}
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DPRINTF("offset 0x%x, value 0x%x\n", offset, value);
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}
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static const MemoryRegionOps puv3_dma_ops = {
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.read = puv3_dma_read,
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.write = puv3_dma_write,
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.impl = {
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.min_access_size = 4,
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.max_access_size = 4,
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},
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.endianness = DEVICE_NATIVE_ENDIAN,
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};
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static int puv3_dma_init(SysBusDevice *dev)
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{
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PUV3DMAState *s = FROM_SYSBUS(PUV3DMAState, dev);
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int i;
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for (i = 0; i < PUV3_DMA_CH_NR; i++) {
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s->reg_CFG[i] = 0x0;
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}
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memory_region_init_io(&s->iomem, &puv3_dma_ops, s, "puv3_dma",
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PUV3_REGS_OFFSET);
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sysbus_init_mmio(dev, &s->iomem);
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return 0;
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}
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static void puv3_dma_class_init(ObjectClass *klass, void *data)
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{
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SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass);
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sdc->init = puv3_dma_init;
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}
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static const TypeInfo puv3_dma_info = {
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.name = "puv3_dma",
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.parent = TYPE_SYS_BUS_DEVICE,
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.instance_size = sizeof(PUV3DMAState),
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.class_init = puv3_dma_class_init,
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};
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static void puv3_dma_register_type(void)
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{
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type_register_static(&puv3_dma_info);
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}
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type_init(puv3_dma_register_type)
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