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qemu-e2k/hw/sparc32_dma.c

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/*
* 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;
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 uint32_t dma_mem_readl(void *opaque, target_phys_addr_t addr)
{
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_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
{
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 CPUReadMemoryFunc * const dma_mem_read[3] = {
NULL,
NULL,
dma_mem_readl,
};
static CPUWriteMemoryFunc * const dma_mem_write[3] = {
NULL,
NULL,
dma_mem_writel,
};
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 dma_io_memory;
int reg_size;
sysbus_init_irq(dev, &s->irq);
dma_io_memory = cpu_register_io_memory(dma_mem_read, dma_mem_write, s,
DEVICE_NATIVE_ENDIAN);
reg_size = s->is_ledma ? DMA_ETH_SIZE : DMA_SIZE;
sysbus_init_mmio(dev, reg_size, dma_io_memory);
qdev_init_gpio_in(&dev->qdev, dma_set_irq, 1);
qdev_init_gpio_out(&dev->qdev, s->gpio, 2);
return 0;
}
static SysBusDeviceInfo sparc32_dma_info = {
.init = sparc32_dma_init1,
.qdev.name = "sparc32_dma",
.qdev.size = sizeof(DMAState),
.qdev.vmsd = &vmstate_dma,
.qdev.reset = dma_reset,
.qdev.props = (Property[]) {
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_register_devices(void)
{
sysbus_register_withprop(&sparc32_dma_info);
}
device_init(sparc32_dma_register_devices)
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