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qemu-e2k/hw/dma/pl080.c
Peter Maydell b85fad1588 hw/dma/pl080: Remove hw_error() if DMA is enabled 
The PL08x model currently will unconditionally call hw_error()
if the DMA engine is enabled by the guest. This has been
present since the PL080 model was edded in 2006, and is
presumably either unintentional debug code left enabled,
or a guard against untested DMA engine code being used.

Remove the hw_error(), since we now have a guest which
will actually try to use the DMA engine (the self-test
binary for the AN505 MPS2 FPGA image).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
2018-08-20 11:24:33 +01:00

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/*
* Arm PrimeCell PL080/PL081 DMA controller
*
* Copyright (c) 2006 CodeSourcery.
* Written by Paul Brook
*
* This code is licensed under the GPL.
*/
#include "qemu/osdep.h"
#include "hw/sysbus.h"
#include "exec/address-spaces.h"
#include "qemu/log.h"
#include "hw/dma/pl080.h"
#include "qapi/error.h"
#define PL080_CONF_E 0x1
#define PL080_CONF_M1 0x2
#define PL080_CONF_M2 0x4
#define PL080_CCONF_H 0x40000
#define PL080_CCONF_A 0x20000
#define PL080_CCONF_L 0x10000
#define PL080_CCONF_ITC 0x08000
#define PL080_CCONF_IE 0x04000
#define PL080_CCONF_E 0x00001
#define PL080_CCTRL_I 0x80000000
#define PL080_CCTRL_DI 0x08000000
#define PL080_CCTRL_SI 0x04000000
#define PL080_CCTRL_D 0x02000000
#define PL080_CCTRL_S 0x01000000
static const VMStateDescription vmstate_pl080_channel = {
.name = "pl080_channel",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(src, pl080_channel),
VMSTATE_UINT32(dest, pl080_channel),
VMSTATE_UINT32(lli, pl080_channel),
VMSTATE_UINT32(ctrl, pl080_channel),
VMSTATE_UINT32(conf, pl080_channel),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_pl080 = {
.name = "pl080",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT8(tc_int, PL080State),
VMSTATE_UINT8(tc_mask, PL080State),
VMSTATE_UINT8(err_int, PL080State),
VMSTATE_UINT8(err_mask, PL080State),
VMSTATE_UINT32(conf, PL080State),
VMSTATE_UINT32(sync, PL080State),
VMSTATE_UINT32(req_single, PL080State),
VMSTATE_UINT32(req_burst, PL080State),
VMSTATE_UINT8(tc_int, PL080State),
VMSTATE_UINT8(tc_int, PL080State),
VMSTATE_UINT8(tc_int, PL080State),
VMSTATE_STRUCT_ARRAY(chan, PL080State, PL080_MAX_CHANNELS,
1, vmstate_pl080_channel, pl080_channel),
VMSTATE_INT32(running, PL080State),
VMSTATE_END_OF_LIST()
}
};
static const unsigned char pl080_id[] =
{ 0x80, 0x10, 0x04, 0x0a, 0x0d, 0xf0, 0x05, 0xb1 };
static const unsigned char pl081_id[] =
{ 0x81, 0x10, 0x04, 0x0a, 0x0d, 0xf0, 0x05, 0xb1 };
static void pl080_update(PL080State *s)
{
bool tclevel = (s->tc_int & s->tc_mask);
bool errlevel = (s->err_int & s->err_mask);
qemu_set_irq(s->interr, errlevel);
qemu_set_irq(s->inttc, tclevel);
qemu_set_irq(s->irq, errlevel || tclevel);
}
static void pl080_run(PL080State *s)
{
int c;
int flow;
pl080_channel *ch;
int swidth;
int dwidth;
int xsize;
int n;
int src_id;
int dest_id;
int size;
uint8_t buff[4];
uint32_t req;
s->tc_mask = 0;
for (c = 0; c < s->nchannels; c++) {
if (s->chan[c].conf & PL080_CCONF_ITC)
s->tc_mask |= 1 << c;
if (s->chan[c].conf & PL080_CCONF_IE)
s->err_mask |= 1 << c;
}
if ((s->conf & PL080_CONF_E) == 0)
return;
/* If we are already in the middle of a DMA operation then indicate that
there may be new DMA requests and return immediately. */
if (s->running) {
s->running++;
return;
}
s->running = 1;
while (s->running) {
for (c = 0; c < s->nchannels; c++) {
ch = &s->chan[c];
again:
/* Test if thiws channel has any pending DMA requests. */
if ((ch->conf & (PL080_CCONF_H | PL080_CCONF_E))
!= PL080_CCONF_E)
continue;
flow = (ch->conf >> 11) & 7;
if (flow >= 4) {
hw_error(
"pl080_run: Peripheral flow control not implemented\n");
}
src_id = (ch->conf >> 1) & 0x1f;
dest_id = (ch->conf >> 6) & 0x1f;
size = ch->ctrl & 0xfff;
req = s->req_single | s->req_burst;
switch (flow) {
case 0:
break;
case 1:
if ((req & (1u << dest_id)) == 0)
size = 0;
break;
case 2:
if ((req & (1u << src_id)) == 0)
size = 0;
break;
case 3:
if ((req & (1u << src_id)) == 0
|| (req & (1u << dest_id)) == 0)
size = 0;
break;
}
if (!size)
continue;
/* Transfer one element. */
/* ??? Should transfer multiple elements for a burst request. */
/* ??? Unclear what the proper behavior is when source and
destination widths are different. */
swidth = 1 << ((ch->ctrl >> 18) & 7);
dwidth = 1 << ((ch->ctrl >> 21) & 7);
for (n = 0; n < dwidth; n+= swidth) {
address_space_read(&s->downstream_as, ch->src,
MEMTXATTRS_UNSPECIFIED, buff + n, swidth);
if (ch->ctrl & PL080_CCTRL_SI)
ch->src += swidth;
}
xsize = (dwidth < swidth) ? swidth : dwidth;
/* ??? This may pad the value incorrectly for dwidth < 32. */
for (n = 0; n < xsize; n += dwidth) {
address_space_write(&s->downstream_as, ch->dest + n,
MEMTXATTRS_UNSPECIFIED, buff + n, dwidth);
if (ch->ctrl & PL080_CCTRL_DI)
ch->dest += swidth;
}
size--;
ch->ctrl = (ch->ctrl & 0xfffff000) | size;
if (size == 0) {
/* Transfer complete. */
if (ch->lli) {
ch->src = address_space_ldl_le(&s->downstream_as,
ch->lli,
MEMTXATTRS_UNSPECIFIED,
NULL);
ch->dest = address_space_ldl_le(&s->downstream_as,
ch->lli + 4,
MEMTXATTRS_UNSPECIFIED,
NULL);
ch->ctrl = address_space_ldl_le(&s->downstream_as,
ch->lli + 12,
MEMTXATTRS_UNSPECIFIED,
NULL);
ch->lli = address_space_ldl_le(&s->downstream_as,
ch->lli + 8,
MEMTXATTRS_UNSPECIFIED,
NULL);
} else {
ch->conf &= ~PL080_CCONF_E;
}
if (ch->ctrl & PL080_CCTRL_I) {
s->tc_int |= 1 << c;
}
}
goto again;
}
if (--s->running)
s->running = 1;
}
}
static uint64_t pl080_read(void *opaque, hwaddr offset,
unsigned size)
{
PL080State *s = (PL080State *)opaque;
uint32_t i;
uint32_t mask;
if (offset >= 0xfe0 && offset < 0x1000) {
if (s->nchannels == 8) {
return pl080_id[(offset - 0xfe0) >> 2];
} else {
return pl081_id[(offset - 0xfe0) >> 2];
}
}
if (offset >= 0x100 && offset < 0x200) {
i = (offset & 0xe0) >> 5;
if (i >= s->nchannels)
goto bad_offset;
switch ((offset >> 2) & 7) {
case 0: /* SrcAddr */
return s->chan[i].src;
case 1: /* DestAddr */
return s->chan[i].dest;
case 2: /* LLI */
return s->chan[i].lli;
case 3: /* Control */
return s->chan[i].ctrl;
case 4: /* Configuration */
return s->chan[i].conf;
default:
goto bad_offset;
}
}
switch (offset >> 2) {
case 0: /* IntStatus */
return (s->tc_int & s->tc_mask) | (s->err_int & s->err_mask);
case 1: /* IntTCStatus */
return (s->tc_int & s->tc_mask);
case 3: /* IntErrorStatus */
return (s->err_int & s->err_mask);
case 5: /* RawIntTCStatus */
return s->tc_int;
case 6: /* RawIntErrorStatus */
return s->err_int;
case 7: /* EnbldChns */
mask = 0;
for (i = 0; i < s->nchannels; i++) {
if (s->chan[i].conf & PL080_CCONF_E)
mask |= 1 << i;
}
return mask;
case 8: /* SoftBReq */
case 9: /* SoftSReq */
case 10: /* SoftLBReq */
case 11: /* SoftLSReq */
/* ??? Implement these. */
return 0;
case 12: /* Configuration */
return s->conf;
case 13: /* Sync */
return s->sync;
default:
bad_offset:
qemu_log_mask(LOG_GUEST_ERROR,
"pl080_read: Bad offset %x\n", (int)offset);
return 0;
}
}
static void pl080_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
PL080State *s = (PL080State *)opaque;
int i;
if (offset >= 0x100 && offset < 0x200) {
i = (offset & 0xe0) >> 5;
if (i >= s->nchannels)
goto bad_offset;
switch ((offset >> 2) & 7) {
case 0: /* SrcAddr */
s->chan[i].src = value;
break;
case 1: /* DestAddr */
s->chan[i].dest = value;
break;
case 2: /* LLI */
s->chan[i].lli = value;
break;
case 3: /* Control */
s->chan[i].ctrl = value;
break;
case 4: /* Configuration */
s->chan[i].conf = value;
pl080_run(s);
break;
}
return;
}
switch (offset >> 2) {
case 2: /* IntTCClear */
s->tc_int &= ~value;
break;
case 4: /* IntErrorClear */
s->err_int &= ~value;
break;
case 8: /* SoftBReq */
case 9: /* SoftSReq */
case 10: /* SoftLBReq */
case 11: /* SoftLSReq */
/* ??? Implement these. */
qemu_log_mask(LOG_UNIMP, "pl080_write: Soft DMA not implemented\n");
break;
case 12: /* Configuration */
s->conf = value;
if (s->conf & (PL080_CONF_M1 | PL080_CONF_M2)) {
qemu_log_mask(LOG_UNIMP,
"pl080_write: Big-endian DMA not implemented\n");
}
pl080_run(s);
break;
case 13: /* Sync */
s->sync = value;
break;
default:
bad_offset:
qemu_log_mask(LOG_GUEST_ERROR,
"pl080_write: Bad offset %x\n", (int)offset);
}
pl080_update(s);
}
static const MemoryRegionOps pl080_ops = {
.read = pl080_read,
.write = pl080_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static void pl080_reset(DeviceState *dev)
{
PL080State *s = PL080(dev);
int i;
s->tc_int = 0;
s->tc_mask = 0;
s->err_int = 0;
s->err_mask = 0;
s->conf = 0;
s->sync = 0;
s->req_single = 0;
s->req_burst = 0;
s->running = 0;
for (i = 0; i < s->nchannels; i++) {
s->chan[i].src = 0;
s->chan[i].dest = 0;
s->chan[i].lli = 0;
s->chan[i].ctrl = 0;
s->chan[i].conf = 0;
}
}
static void pl080_init(Object *obj)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
PL080State *s = PL080(obj);
memory_region_init_io(&s->iomem, OBJECT(s), &pl080_ops, s, "pl080", 0x1000);
sysbus_init_mmio(sbd, &s->iomem);
sysbus_init_irq(sbd, &s->irq);
sysbus_init_irq(sbd, &s->interr);
sysbus_init_irq(sbd, &s->inttc);
s->nchannels = 8;
}
static void pl080_realize(DeviceState *dev, Error **errp)
{
PL080State *s = PL080(dev);
if (!s->downstream) {
error_setg(errp, "PL080 'downstream' link not set");
return;
}
address_space_init(&s->downstream_as, s->downstream, "pl080-downstream");
}
static void pl081_init(Object *obj)
{
PL080State *s = PL080(obj);
s->nchannels = 2;
}
static Property pl080_properties[] = {
DEFINE_PROP_LINK("downstream", PL080State, downstream,
TYPE_MEMORY_REGION, MemoryRegion *),
DEFINE_PROP_END_OF_LIST(),
};
static void pl080_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
dc->vmsd = &vmstate_pl080;
dc->realize = pl080_realize;
dc->props = pl080_properties;
dc->reset = pl080_reset;
}
static const TypeInfo pl080_info = {
.name = TYPE_PL080,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(PL080State),
.instance_init = pl080_init,
.class_init = pl080_class_init,
};
static const TypeInfo pl081_info = {
.name = TYPE_PL081,
.parent = TYPE_PL080,
.instance_init = pl081_init,
};
/* The PL080 and PL081 are the same except for the number of channels
they implement (8 and 2 respectively). */
static void pl080_register_types(void)
{
type_register_static(&pl080_info);
type_register_static(&pl081_info);
}
type_init(pl080_register_types)
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