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qemu-patch-raspberry4/hw/dma/pl080.c
Peter Maydell 112a829f8f hw/dma/pl080: Don't use CPU address space for DMA accesses 
Currently our PL080/PL081 model uses a combination of the CPU's
address space (via cpu_physical_memory_{read,write}()) and the
system address space for performing DMA accesses.

For the PL081s in the MPS FPGA images, their DMA accesses
must go via Master Security Controllers. Switch the
PL080/PL081 model to take a MemoryRegion property which
defines its downstream for making DMA accesses.

Since the PL08x are only used in two board models, we
make provision of the 'downstream' link mandatory and convert
both users at once, rather than having it be optional with
a default to the system address space.

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;
hw_error("DMA active\n");
/* 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) {
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) {
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;
}
}
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_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;
}
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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