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2507c12ab0
xemu/hw/pl080.c
Alexander Graf 2507c12ab0 Add endianness as io mem parameter 
As stated before, devices can be little, big or native endian. The
target endianness is not of their concern, so we need to push things
down a level.

This patch adds a parameter to cpu_register_io_memory that allows a
device to choose its endianness. For now, all devices simply choose
native endian, because that's the same behavior as before.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-12-11 15:24:25 +00:00

356 lines
9.6 KiB
C
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/*
* Arm PrimeCell PL080/PL081 DMA controller
*
* Copyright (c) 2006 CodeSourcery.
* Written by Paul Brook
*
* This code is licenced under the GPL.
*/
#include "sysbus.h"
#define PL080_MAX_CHANNELS 8
#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
typedef struct {
uint32_t src;
uint32_t dest;
uint32_t lli;
uint32_t ctrl;
uint32_t conf;
} pl080_channel;
typedef struct {
SysBusDevice busdev;
uint8_t tc_int;
uint8_t tc_mask;
uint8_t err_int;
uint8_t err_mask;
uint32_t conf;
uint32_t sync;
uint32_t req_single;
uint32_t req_burst;
pl080_channel chan[PL080_MAX_CHANNELS];
int nchannels;
/* Flag to avoid recursive DMA invocations. */
int running;
qemu_irq irq;
} pl080_state;
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(pl080_state *s)
{
if ((s->tc_int & s->tc_mask)
|| (s->err_int & s->err_mask))
qemu_irq_raise(s->irq);
else
qemu_irq_lower(s->irq);
}
static void pl080_run(pl080_state *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) {
cpu_physical_memory_read(ch->src, 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) {
cpu_physical_memory_write(ch->dest + n, 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 = ldl_phys(ch->lli);
ch->dest = ldl_phys(ch->lli + 4);
ch->ctrl = ldl_phys(ch->lli + 12);
ch->lli = ldl_phys(ch->lli + 8);
} 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 uint32_t pl080_read(void *opaque, target_phys_addr_t offset)
{
pl080_state *s = (pl080_state *)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:
hw_error("pl080_read: Bad offset %x\n", (int)offset);
return 0;
}
}
static void pl080_write(void *opaque, target_phys_addr_t offset,
uint32_t value)
{
pl080_state *s = (pl080_state *)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. */
hw_error("pl080_write: Soft DMA not implemented\n");
break;
case 12: /* Configuration */
s->conf = value;
if (s->conf & (PL080_CONF_M1 | PL080_CONF_M1)) {
hw_error("pl080_write: Big-endian DMA not implemented\n");
}
pl080_run(s);
break;
case 13: /* Sync */
s->sync = value;
break;
default:
bad_offset:
hw_error("pl080_write: Bad offset %x\n", (int)offset);
}
pl080_update(s);
}
static CPUReadMemoryFunc * const pl080_readfn[] = {
pl080_read,
pl080_read,
pl080_read
};
static CPUWriteMemoryFunc * const pl080_writefn[] = {
pl080_write,
pl080_write,
pl080_write
};
static int pl08x_init(SysBusDevice *dev, int nchannels)
{
int iomemtype;
pl080_state *s = FROM_SYSBUS(pl080_state, dev);
iomemtype = cpu_register_io_memory(pl080_readfn,
pl080_writefn, s,
DEVICE_NATIVE_ENDIAN);
sysbus_init_mmio(dev, 0x1000, iomemtype);
sysbus_init_irq(dev, &s->irq);
s->nchannels = nchannels;
/* ??? Save/restore. */
return 0;
}
static int pl080_init(SysBusDevice *dev)
{
return pl08x_init(dev, 8);
}
static int pl081_init(SysBusDevice *dev)
{
return pl08x_init(dev, 2);
}
/* The PL080 and PL081 are the same except for the number of channels
they implement (8 and 2 respectively). */
static void pl080_register_devices(void)
{
sysbus_register_dev("pl080", sizeof(pl080_state), pl080_init);
sysbus_register_dev("pl081", sizeof(pl080_state), pl081_init);
}
device_init(pl080_register_devices)
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