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qemu/hw/dma/i8257.c

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/*
* QEMU DMA emulation
*
* Copyright (c) 2003-2004 Vassili Karpov (malc)
*
* 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 "qemu/osdep.h"
#include "hw/hw.h"
#include "hw/isa/isa.h"
#include "hw/dma/i8257.h"
#include "qemu/main-loop.h"
#include "trace.h"
#define I8257(obj) \
OBJECT_CHECK(I8257State, (obj), TYPE_I8257)
/* #define DEBUG_DMA */
#define dolog(...) fprintf (stderr, "dma: " __VA_ARGS__)
#ifdef DEBUG_DMA
#define linfo(...) fprintf (stderr, "dma: " __VA_ARGS__)
#define ldebug(...) fprintf (stderr, "dma: " __VA_ARGS__)
#else
#define linfo(...)
#define ldebug(...)
#endif
#define ADDR 0
#define COUNT 1
enum {
CMD_MEMORY_TO_MEMORY = 0x01,
CMD_FIXED_ADDRESS = 0x02,
CMD_BLOCK_CONTROLLER = 0x04,
CMD_COMPRESSED_TIME = 0x08,
CMD_CYCLIC_PRIORITY = 0x10,
CMD_EXTENDED_WRITE = 0x20,
CMD_LOW_DREQ = 0x40,
CMD_LOW_DACK = 0x80,
CMD_NOT_SUPPORTED = CMD_MEMORY_TO_MEMORY | CMD_FIXED_ADDRESS
| CMD_COMPRESSED_TIME | CMD_CYCLIC_PRIORITY | CMD_EXTENDED_WRITE
| CMD_LOW_DREQ | CMD_LOW_DACK
};
static void i8257_dma_run(void *opaque);
static const int channels[8] = {-1, 2, 3, 1, -1, -1, -1, 0};
static void i8257_write_page(void *opaque, uint32_t nport, uint32_t data)
{
I8257State *d = opaque;
int ichan;
ichan = channels[nport & 7];
if (-1 == ichan) {
dolog ("invalid channel %#x %#x\n", nport, data);
return;
}
d->regs[ichan].page = data;
}
static void i8257_write_pageh(void *opaque, uint32_t nport, uint32_t data)
{
I8257State *d = opaque;
int ichan;
ichan = channels[nport & 7];
if (-1 == ichan) {
dolog ("invalid channel %#x %#x\n", nport, data);
return;
}
d->regs[ichan].pageh = data;
}
static uint32_t i8257_read_page(void *opaque, uint32_t nport)
{
I8257State *d = opaque;
int ichan;
ichan = channels[nport & 7];
if (-1 == ichan) {
dolog ("invalid channel read %#x\n", nport);
return 0;
}
return d->regs[ichan].page;
}
static uint32_t i8257_read_pageh(void *opaque, uint32_t nport)
{
I8257State *d = opaque;
int ichan;
ichan = channels[nport & 7];
if (-1 == ichan) {
dolog ("invalid channel read %#x\n", nport);
return 0;
}
return d->regs[ichan].pageh;
}
static inline void i8257_init_chan(I8257State *d, int ichan)
{
I8257Regs *r;
r = d->regs + ichan;
r->now[ADDR] = r->base[ADDR] << d->dshift;
r->now[COUNT] = 0;
}
static inline int i8257_getff(I8257State *d)
{
int ff;
ff = d->flip_flop;
d->flip_flop = !ff;
return ff;
}
static uint64_t i8257_read_chan(void *opaque, hwaddr nport, unsigned size)
{
I8257State *d = opaque;
int ichan, nreg, iport, ff, val, dir;
I8257Regs *r;
iport = (nport >> d->dshift) & 0x0f;
ichan = iport >> 1;
nreg = iport & 1;
r = d->regs + ichan;
dir = ((r->mode >> 5) & 1) ? -1 : 1;
ff = i8257_getff(d);
if (nreg)
val = (r->base[COUNT] << d->dshift) - r->now[COUNT];
else
val = r->now[ADDR] + r->now[COUNT] * dir;
ldebug ("read_chan %#x -> %d\n", iport, val);
return (val >> (d->dshift + (ff << 3))) & 0xff;
}
static void i8257_write_chan(void *opaque, hwaddr nport, uint64_t data,
unsigned int size)
{
I8257State *d = opaque;
int iport, ichan, nreg;
I8257Regs *r;
iport = (nport >> d->dshift) & 0x0f;
ichan = iport >> 1;
nreg = iport & 1;
r = d->regs + ichan;
if (i8257_getff(d)) {
r->base[nreg] = (r->base[nreg] & 0xff) | ((data << 8) & 0xff00);
i8257_init_chan(d, ichan);
} else {
r->base[nreg] = (r->base[nreg] & 0xff00) | (data & 0xff);
}
}
static void i8257_write_cont(void *opaque, hwaddr nport, uint64_t data,
unsigned int size)
{
I8257State *d = opaque;
int iport, ichan = 0;
iport = (nport >> d->dshift) & 0x0f;
switch (iport) {
case 0x00: /* command */
if ((data != 0) && (data & CMD_NOT_SUPPORTED)) {
dolog("command %"PRIx64" not supported\n", data);
return;
}
d->command = data;
break;
case 0x01:
ichan = data & 3;
if (data & 4) {
d->status |= 1 << (ichan + 4);
}
else {
d->status &= ~(1 << (ichan + 4));
}
d->status &= ~(1 << ichan);
i8257_dma_run(d);
break;
case 0x02: /* single mask */
if (data & 4)
d->mask |= 1 << (data & 3);
else
d->mask &= ~(1 << (data & 3));
i8257_dma_run(d);
break;
case 0x03: /* mode */
{
ichan = data & 3;
#ifdef DEBUG_DMA
{
int op, ai, dir, opmode;
op = (data >> 2) & 3;
ai = (data >> 4) & 1;
dir = (data >> 5) & 1;
opmode = (data >> 6) & 3;
linfo ("ichan %d, op %d, ai %d, dir %d, opmode %d\n",
ichan, op, ai, dir, opmode);
}
#endif
d->regs[ichan].mode = data;
break;
}
case 0x04: /* clear flip flop */
d->flip_flop = 0;
break;
case 0x05: /* reset */
d->flip_flop = 0;
d->mask = ~0;
d->status = 0;
d->command = 0;
break;
case 0x06: /* clear mask for all channels */
d->mask = 0;
i8257_dma_run(d);
break;
case 0x07: /* write mask for all channels */
d->mask = data;
i8257_dma_run(d);
break;
default:
dolog ("unknown iport %#x\n", iport);
break;
}
#ifdef DEBUG_DMA
if (0xc != iport) {
linfo ("write_cont: nport %#06x, ichan % 2d, val %#06x\n",
nport, ichan, data);
}
#endif
}
static uint64_t i8257_read_cont(void *opaque, hwaddr nport, unsigned size)
{
I8257State *d = opaque;
int iport, val;
iport = (nport >> d->dshift) & 0x0f;
switch (iport) {
case 0x00: /* status */
val = d->status;
d->status &= 0xf0;
break;
case 0x01: /* mask */
val = d->mask;
break;
default:
val = 0;
break;
}
ldebug ("read_cont: nport %#06x, iport %#04x val %#x\n", nport, iport, val);
return val;
}
static IsaDmaTransferMode i8257_dma_get_transfer_mode(IsaDma *obj, int nchan)
{
I8257State *d = I8257(obj);
return (d->regs[nchan & 3].mode >> 2) & 3;
}
static bool i8257_dma_has_autoinitialization(IsaDma *obj, int nchan)
{
I8257State *d = I8257(obj);
return (d->regs[nchan & 3].mode >> 4) & 1;
}
static void i8257_dma_hold_DREQ(IsaDma *obj, int nchan)
{
I8257State *d = I8257(obj);
int ichan;
ichan = nchan & 3;
d->status |= 1 << (ichan + 4);
i8257_dma_run(d);
}
static void i8257_dma_release_DREQ(IsaDma *obj, int nchan)
{
I8257State *d = I8257(obj);
int ichan;
ichan = nchan & 3;
d->status &= ~(1 << (ichan + 4));
i8257_dma_run(d);
}
static void i8257_channel_run(I8257State *d, int ichan)
{
int ncont = d->dshift;
int n;
I8257Regs *r = &d->regs[ichan];
#ifdef DEBUG_DMA
int dir, opmode;
dir = (r->mode >> 5) & 1;
opmode = (r->mode >> 6) & 3;
if (dir) {
dolog ("DMA in address decrement mode\n");
}
if (opmode != 1) {
dolog ("DMA not in single mode select %#x\n", opmode);
}
#endif
n = r->transfer_handler (r->opaque, ichan + (ncont << 2),
r->now[COUNT], (r->base[COUNT] + 1) << ncont);
r->now[COUNT] = n;
ldebug ("dma_pos %d size %d\n", n, (r->base[COUNT] + 1) << ncont);
if (n == (r->base[COUNT] + 1) << ncont) {
ldebug("transfer done\n");
d->status |= (1 << ichan);
}
}
static void i8257_dma_run(void *opaque)
{
I8257State *d = opaque;
int ichan;
int rearm = 0;
if (d->running) {
rearm = 1;
goto out;
} else {
d->running = 1;
}
for (ichan = 0; ichan < 4; ichan++) {
int mask;
mask = 1 << ichan;
if ((0 == (d->mask & mask)) && (0 != (d->status & (mask << 4)))) {
i8257_channel_run(d, ichan);
rearm = 1;
}
}
d->running = 0;
out:
if (rearm) {
qemu_bh_schedule_idle(d->dma_bh);
d->dma_bh_scheduled = true;
}
}
static void i8257_dma_register_channel(IsaDma *obj, int nchan,
IsaDmaTransferHandler transfer_handler,
void *opaque)
{
I8257State *d = I8257(obj);
I8257Regs *r;
int ichan;
ichan = nchan & 3;
r = d->regs + ichan;
r->transfer_handler = transfer_handler;
r->opaque = opaque;
}
static int i8257_dma_read_memory(IsaDma *obj, int nchan, void *buf, int pos,
int len)
{
I8257State *d = I8257(obj);
I8257Regs *r = &d->regs[nchan & 3];
hwaddr addr = ((r->pageh & 0x7f) << 24) | (r->page << 16) | r->now[ADDR];
if (r->mode & 0x20) {
int i;
uint8_t *p = buf;
cpu_physical_memory_read (addr - pos - len, buf, len);
/* What about 16bit transfers? */
for (i = 0; i < len >> 1; i++) {
uint8_t b = p[len - i - 1];
p[i] = b;
}
}
else
cpu_physical_memory_read (addr + pos, buf, len);
return len;
}
static int i8257_dma_write_memory(IsaDma *obj, int nchan, void *buf, int pos,
int len)
{
I8257State *s = I8257(obj);
I8257Regs *r = &s->regs[nchan & 3];
hwaddr addr = ((r->pageh & 0x7f) << 24) | (r->page << 16) | r->now[ADDR];
if (r->mode & 0x20) {
int i;
uint8_t *p = buf;
cpu_physical_memory_write (addr - pos - len, buf, len);
/* What about 16bit transfers? */
for (i = 0; i < len; i++) {
uint8_t b = p[len - i - 1];
p[i] = b;
}
}
else
cpu_physical_memory_write (addr + pos, buf, len);
return len;
}
/* request the emulator to transfer a new DMA memory block ASAP (even
* if the idle bottom half would not have exited the iothread yet).
*/
static void i8257_dma_schedule(IsaDma *obj)
{
I8257State *d = I8257(obj);
if (d->dma_bh_scheduled) {
qemu_notify_event();
}
}
static void i8257_reset(DeviceState *dev)
{
I8257State *d = I8257(dev);
i8257_write_cont(d, (0x05 << d->dshift), 0, 1);
}
static int i8257_phony_handler(void *opaque, int nchan, int dma_pos,
int dma_len)
{
trace_i8257_unregistered_dma(nchan, dma_pos, dma_len);
return dma_pos;
}
static const MemoryRegionOps channel_io_ops = {
.read = i8257_read_chan,
.write = i8257_write_chan,
.endianness = DEVICE_NATIVE_ENDIAN,
.impl = {
.min_access_size = 1,
.max_access_size = 1,
},
};
/* IOport from page_base */
static const MemoryRegionPortio page_portio_list[] = {
{ 0x01, 3, 1, .write = i8257_write_page, .read = i8257_read_page, },
{ 0x07, 1, 1, .write = i8257_write_page, .read = i8257_read_page, },
PORTIO_END_OF_LIST(),
};
/* IOport from pageh_base */
static const MemoryRegionPortio pageh_portio_list[] = {
{ 0x01, 3, 1, .write = i8257_write_pageh, .read = i8257_read_pageh, },
{ 0x07, 3, 1, .write = i8257_write_pageh, .read = i8257_read_pageh, },
PORTIO_END_OF_LIST(),
};
static const MemoryRegionOps cont_io_ops = {
.read = i8257_read_cont,
.write = i8257_write_cont,
.endianness = DEVICE_NATIVE_ENDIAN,
.impl = {
.min_access_size = 1,
.max_access_size = 1,
},
};
static const VMStateDescription vmstate_i8257_regs = {
.name = "dma_regs",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_INT32_ARRAY(now, I8257Regs, 2),
VMSTATE_UINT16_ARRAY(base, I8257Regs, 2),
VMSTATE_UINT8(mode, I8257Regs),
VMSTATE_UINT8(page, I8257Regs),
VMSTATE_UINT8(pageh, I8257Regs),
VMSTATE_UINT8(dack, I8257Regs),
VMSTATE_UINT8(eop, I8257Regs),
VMSTATE_END_OF_LIST()
}
};
static int i8257_post_load(void *opaque, int version_id)
{
I8257State *d = opaque;
i8257_dma_run(d);
return 0;
}
static const VMStateDescription vmstate_i8257 = {
.name = "dma",
.version_id = 1,
.minimum_version_id = 1,
.post_load = i8257_post_load,
.fields = (VMStateField[]) {
VMSTATE_UINT8(command, I8257State),
VMSTATE_UINT8(mask, I8257State),
VMSTATE_UINT8(flip_flop, I8257State),
VMSTATE_INT32(dshift, I8257State),
VMSTATE_STRUCT_ARRAY(regs, I8257State, 4, 1, vmstate_i8257_regs,
I8257Regs),
VMSTATE_END_OF_LIST()
}
};
static void i8257_realize(DeviceState *dev, Error **errp)
{
ISADevice *isa = ISA_DEVICE(dev);
I8257State *d = I8257(dev);
int i;
memory_region_init_io(&d->channel_io, NULL, &channel_io_ops, d,
"dma-chan", 8 << d->dshift);
memory_region_add_subregion(isa_address_space_io(isa),
d->base, &d->channel_io);
isa_register_portio_list(isa, &d->portio_page,
d->page_base, page_portio_list, d,
"dma-page");
if (d->pageh_base >= 0) {
isa_register_portio_list(isa, &d->portio_pageh,
d->pageh_base, pageh_portio_list, d,
"dma-pageh");
}
memory_region_init_io(&d->cont_io, OBJECT(isa), &cont_io_ops, d,
"dma-cont", 8 << d->dshift);
memory_region_add_subregion(isa_address_space_io(isa),
d->base + (8 << d->dshift), &d->cont_io);
for (i = 0; i < ARRAY_SIZE(d->regs); ++i) {
d->regs[i].transfer_handler = i8257_phony_handler;
}
d->dma_bh = qemu_bh_new(i8257_dma_run, d);
}
static Property i8257_properties[] = {
DEFINE_PROP_INT32("base", I8257State, base, 0x00),
DEFINE_PROP_INT32("page-base", I8257State, page_base, 0x80),
DEFINE_PROP_INT32("pageh-base", I8257State, pageh_base, 0x480),
DEFINE_PROP_INT32("dshift", I8257State, dshift, 0),
DEFINE_PROP_END_OF_LIST()
};
static void i8257_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
IsaDmaClass *idc = ISADMA_CLASS(klass);
dc->realize = i8257_realize;
dc->reset = i8257_reset;
dc->vmsd = &vmstate_i8257;
dc->props = i8257_properties;
idc->get_transfer_mode = i8257_dma_get_transfer_mode;
idc->has_autoinitialization = i8257_dma_has_autoinitialization;
idc->read_memory = i8257_dma_read_memory;
idc->write_memory = i8257_dma_write_memory;
idc->hold_DREQ = i8257_dma_hold_DREQ;
idc->release_DREQ = i8257_dma_release_DREQ;
idc->schedule = i8257_dma_schedule;
idc->register_channel = i8257_dma_register_channel;
/* Reason: needs to be wired up by isa_bus_dma() to work */
dc->user_creatable = false;
}
static const TypeInfo i8257_info = {
.name = TYPE_I8257,
.parent = TYPE_ISA_DEVICE,
.instance_size = sizeof(I8257State),
.class_init = i8257_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_ISADMA },
{ }
}
};
static void i8257_register_types(void)
{
type_register_static(&i8257_info);
}
type_init(i8257_register_types)
void i8257_dma_init(ISABus *bus, bool high_page_enable)
{
ISADevice *isa1, *isa2;
DeviceState *d;
isa1 = isa_create(bus, TYPE_I8257);
d = DEVICE(isa1);
qdev_prop_set_int32(d, "base", 0x00);
qdev_prop_set_int32(d, "page-base", 0x80);
qdev_prop_set_int32(d, "pageh-base", high_page_enable ? 0x480 : -1);
qdev_prop_set_int32(d, "dshift", 0);
qdev_init_nofail(d);
isa2 = isa_create(bus, TYPE_I8257);
d = DEVICE(isa2);
qdev_prop_set_int32(d, "base", 0xc0);
qdev_prop_set_int32(d, "page-base", 0x88);
qdev_prop_set_int32(d, "pageh-base", high_page_enable ? 0x488 : -1);
qdev_prop_set_int32(d, "dshift", 1);
qdev_init_nofail(d);
isa_bus_dma(bus, ISADMA(isa1), ISADMA(isa2));
}
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