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qemu/hw/pxa2xx_dma.c

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/*
* Intel XScale PXA255/270 DMA controller.
*
* Copyright (c) 2006 Openedhand Ltd.
* Copyright (c) 2006 Thorsten Zitterell
* Written by Andrzej Zaborowski <balrog@zabor.org>
*
* This code is licenced under the GPL.
*/
#include "hw.h"
#include "pxa.h"
struct pxa2xx_dma_channel_s {
target_phys_addr_t descr;
target_phys_addr_t src;
target_phys_addr_t dest;
uint32_t cmd;
uint32_t state;
int request;
};
/* Allow the DMA to be used as a PIC. */
typedef void (*pxa2xx_dma_handler_t)(void *opaque, int irq, int level);
struct pxa2xx_dma_state_s {
pxa2xx_dma_handler_t handler;
target_phys_addr_t base;
qemu_irq irq;
uint32_t stopintr;
uint32_t eorintr;
uint32_t rasintr;
uint32_t startintr;
uint32_t endintr;
uint32_t align;
uint32_t pio;
int channels;
struct pxa2xx_dma_channel_s *chan;
uint8_t *req;
/* Flag to avoid recursive DMA invocations. */
int running;
};
#define PXA255_DMA_NUM_CHANNELS 16
#define PXA27X_DMA_NUM_CHANNELS 32
#define PXA2XX_DMA_NUM_REQUESTS 75
#define DCSR0 0x0000 /* DMA Control / Status register for Channel 0 */
#define DCSR31 0x007c /* DMA Control / Status register for Channel 31 */
#define DALGN 0x00a0 /* DMA Alignment register */
#define DPCSR 0x00a4 /* DMA Programmed I/O Control Status register */
#define DRQSR0 0x00e0 /* DMA DREQ<0> Status register */
#define DRQSR1 0x00e4 /* DMA DREQ<1> Status register */
#define DRQSR2 0x00e8 /* DMA DREQ<2> Status register */
#define DINT 0x00f0 /* DMA Interrupt register */
#define DRCMR0 0x0100 /* Request to Channel Map register 0 */
#define DRCMR63 0x01fc /* Request to Channel Map register 63 */
#define D_CH0 0x0200 /* Channel 0 Descriptor start */
#define DRCMR64 0x1100 /* Request to Channel Map register 64 */
#define DRCMR74 0x1128 /* Request to Channel Map register 74 */
/* Per-channel register */
#define DDADR 0x00
#define DSADR 0x01
#define DTADR 0x02
#define DCMD 0x03
/* Bit-field masks */
#define DRCMR_CHLNUM 0x1f
#define DRCMR_MAPVLD (1 << 7)
#define DDADR_STOP (1 << 0)
#define DDADR_BREN (1 << 1)
#define DCMD_LEN 0x1fff
#define DCMD_WIDTH(x) (1 << ((((x) >> 14) & 3) - 1))
#define DCMD_SIZE(x) (4 << (((x) >> 16) & 3))
#define DCMD_FLYBYT (1 << 19)
#define DCMD_FLYBYS (1 << 20)
#define DCMD_ENDIRQEN (1 << 21)
#define DCMD_STARTIRQEN (1 << 22)
#define DCMD_CMPEN (1 << 25)
#define DCMD_FLOWTRG (1 << 28)
#define DCMD_FLOWSRC (1 << 29)
#define DCMD_INCTRGADDR (1 << 30)
#define DCMD_INCSRCADDR (1 << 31)
#define DCSR_BUSERRINTR (1 << 0)
#define DCSR_STARTINTR (1 << 1)
#define DCSR_ENDINTR (1 << 2)
#define DCSR_STOPINTR (1 << 3)
#define DCSR_RASINTR (1 << 4)
#define DCSR_REQPEND (1 << 8)
#define DCSR_EORINT (1 << 9)
#define DCSR_CMPST (1 << 10)
#define DCSR_MASKRUN (1 << 22)
#define DCSR_RASIRQEN (1 << 23)
#define DCSR_CLRCMPST (1 << 24)
#define DCSR_SETCMPST (1 << 25)
#define DCSR_EORSTOPEN (1 << 26)
#define DCSR_EORJMPEN (1 << 27)
#define DCSR_EORIRQEN (1 << 28)
#define DCSR_STOPIRQEN (1 << 29)
#define DCSR_NODESCFETCH (1 << 30)
#define DCSR_RUN (1 << 31)
static inline void pxa2xx_dma_update(struct pxa2xx_dma_state_s *s, int ch)
{
if (ch >= 0) {
if ((s->chan[ch].state & DCSR_STOPIRQEN) &&
(s->chan[ch].state & DCSR_STOPINTR))
s->stopintr |= 1 << ch;
else
s->stopintr &= ~(1 << ch);
if ((s->chan[ch].state & DCSR_EORIRQEN) &&
(s->chan[ch].state & DCSR_EORINT))
s->eorintr |= 1 << ch;
else
s->eorintr &= ~(1 << ch);
if ((s->chan[ch].state & DCSR_RASIRQEN) &&
(s->chan[ch].state & DCSR_RASINTR))
s->rasintr |= 1 << ch;
else
s->rasintr &= ~(1 << ch);
if (s->chan[ch].state & DCSR_STARTINTR)
s->startintr |= 1 << ch;
else
s->startintr &= ~(1 << ch);
if (s->chan[ch].state & DCSR_ENDINTR)
s->endintr |= 1 << ch;
else
s->endintr &= ~(1 << ch);
}
if (s->stopintr | s->eorintr | s->rasintr | s->startintr | s->endintr)
qemu_irq_raise(s->irq);
else
qemu_irq_lower(s->irq);
}
static inline void pxa2xx_dma_descriptor_fetch(
struct pxa2xx_dma_state_s *s, int ch)
{
uint32_t desc[4];
target_phys_addr_t daddr = s->chan[ch].descr & ~0xf;
if ((s->chan[ch].descr & DDADR_BREN) && (s->chan[ch].state & DCSR_CMPST))
daddr += 32;
cpu_physical_memory_read(daddr, (uint8_t *) desc, 16);
s->chan[ch].descr = desc[DDADR];
s->chan[ch].src = desc[DSADR];
s->chan[ch].dest = desc[DTADR];
s->chan[ch].cmd = desc[DCMD];
if (s->chan[ch].cmd & DCMD_FLOWSRC)
s->chan[ch].src &= ~3;
if (s->chan[ch].cmd & DCMD_FLOWTRG)
s->chan[ch].dest &= ~3;
if (s->chan[ch].cmd & (DCMD_CMPEN | DCMD_FLYBYS | DCMD_FLYBYT))
printf("%s: unsupported mode in channel %i\n", __FUNCTION__, ch);
if (s->chan[ch].cmd & DCMD_STARTIRQEN)
s->chan[ch].state |= DCSR_STARTINTR;
}
static void pxa2xx_dma_run(struct pxa2xx_dma_state_s *s)
{
int c, srcinc, destinc;
uint32_t n, size;
uint32_t width;
uint32_t length;
char buffer[32];
struct pxa2xx_dma_channel_s *ch;
if (s->running ++)
return;
while (s->running) {
s->running = 1;
for (c = 0; c < s->channels; c ++) {
ch = &s->chan[c];
while ((ch->state & DCSR_RUN) && !(ch->state & DCSR_STOPINTR)) {
/* Test for pending requests */
if ((ch->cmd & (DCMD_FLOWSRC | DCMD_FLOWTRG)) && !ch->request)
break;
length = ch->cmd & DCMD_LEN;
size = DCMD_SIZE(ch->cmd);
width = DCMD_WIDTH(ch->cmd);
srcinc = (ch->cmd & DCMD_INCSRCADDR) ? width : 0;
destinc = (ch->cmd & DCMD_INCTRGADDR) ? width : 0;
while (length) {
size = MIN(length, size);
for (n = 0; n < size; n += width) {
cpu_physical_memory_read(ch->src, buffer + n, width);
ch->src += srcinc;
}
for (n = 0; n < size; n += width) {
cpu_physical_memory_write(ch->dest, buffer + n, width);
ch->dest += destinc;
}
length -= size;
if ((ch->cmd & (DCMD_FLOWSRC | DCMD_FLOWTRG)) &&
!ch->request) {
ch->state |= DCSR_EORINT;
if (ch->state & DCSR_EORSTOPEN)
ch->state |= DCSR_STOPINTR;
if ((ch->state & DCSR_EORJMPEN) &&
!(ch->state & DCSR_NODESCFETCH))
pxa2xx_dma_descriptor_fetch(s, c);
break;
}
}
ch->cmd = (ch->cmd & ~DCMD_LEN) | length;
/* Is the transfer complete now? */
if (!length) {
if (ch->cmd & DCMD_ENDIRQEN)
ch->state |= DCSR_ENDINTR;
if ((ch->state & DCSR_NODESCFETCH) ||
(ch->descr & DDADR_STOP) ||
(ch->state & DCSR_EORSTOPEN)) {
ch->state |= DCSR_STOPINTR;
ch->state &= ~DCSR_RUN;
break;
}
ch->state |= DCSR_STOPINTR;
break;
}
}
}
s->running --;
}
}
static uint32_t pxa2xx_dma_read(void *opaque, target_phys_addr_t offset)
{
struct pxa2xx_dma_state_s *s = (struct pxa2xx_dma_state_s *) opaque;
unsigned int channel;
offset -= s->base;
switch (offset) {
case DRCMR64 ... DRCMR74:
offset -= DRCMR64 - DRCMR0 - (64 << 2);
/* Fall through */
case DRCMR0 ... DRCMR63:
channel = (offset - DRCMR0) >> 2;
return s->req[channel];
case DRQSR0:
case DRQSR1:
case DRQSR2:
return 0;
case DCSR0 ... DCSR31:
channel = offset >> 2;
if (s->chan[channel].request)
return s->chan[channel].state | DCSR_REQPEND;
return s->chan[channel].state;
case DINT:
return s->stopintr | s->eorintr | s->rasintr |
s->startintr | s->endintr;
case DALGN:
return s->align;
case DPCSR:
return s->pio;
}
if (offset >= D_CH0 && offset < D_CH0 + (s->channels << 4)) {
channel = (offset - D_CH0) >> 4;
switch ((offset & 0x0f) >> 2) {
case DDADR:
return s->chan[channel].descr;
case DSADR:
return s->chan[channel].src;
case DTADR:
return s->chan[channel].dest;
case DCMD:
return s->chan[channel].cmd;
}
}
cpu_abort(cpu_single_env,
"%s: Bad offset 0x" TARGET_FMT_plx "\n", __FUNCTION__, offset);
return 7;
}
static void pxa2xx_dma_write(void *opaque,
target_phys_addr_t offset, uint32_t value)
{
struct pxa2xx_dma_state_s *s = (struct pxa2xx_dma_state_s *) opaque;
unsigned int channel;
offset -= s->base;
switch (offset) {
case DRCMR64 ... DRCMR74:
offset -= DRCMR64 - DRCMR0 - (64 << 2);
/* Fall through */
case DRCMR0 ... DRCMR63:
channel = (offset - DRCMR0) >> 2;
if (value & DRCMR_MAPVLD)
if ((value & DRCMR_CHLNUM) > s->channels)
cpu_abort(cpu_single_env, "%s: Bad DMA channel %i\n",
__FUNCTION__, value & DRCMR_CHLNUM);
s->req[channel] = value;
break;
case DRQSR0:
case DRQSR1:
case DRQSR2:
/* Nothing to do */
break;
case DCSR0 ... DCSR31:
channel = offset >> 2;
s->chan[channel].state &= 0x0000071f & ~(value &
(DCSR_EORINT | DCSR_ENDINTR |
DCSR_STARTINTR | DCSR_BUSERRINTR));
s->chan[channel].state |= value & 0xfc800000;
if (s->chan[channel].state & DCSR_STOPIRQEN)
s->chan[channel].state &= ~DCSR_STOPINTR;
if (value & DCSR_NODESCFETCH) {
/* No-descriptor-fetch mode */
if (value & DCSR_RUN) {
s->chan[channel].state &= ~DCSR_STOPINTR;
pxa2xx_dma_run(s);
}
} else {
/* Descriptor-fetch mode */
if (value & DCSR_RUN) {
s->chan[channel].state &= ~DCSR_STOPINTR;
pxa2xx_dma_descriptor_fetch(s, channel);
pxa2xx_dma_run(s);
}
}
/* Shouldn't matter as our DMA is synchronous. */
if (!(value & (DCSR_RUN | DCSR_MASKRUN)))
s->chan[channel].state |= DCSR_STOPINTR;
if (value & DCSR_CLRCMPST)
s->chan[channel].state &= ~DCSR_CMPST;
if (value & DCSR_SETCMPST)
s->chan[channel].state |= DCSR_CMPST;
pxa2xx_dma_update(s, channel);
break;
case DALGN:
s->align = value;
break;
case DPCSR:
s->pio = value & 0x80000001;
break;
default:
if (offset >= D_CH0 && offset < D_CH0 + (s->channels << 4)) {
channel = (offset - D_CH0) >> 4;
switch ((offset & 0x0f) >> 2) {
case DDADR:
s->chan[channel].descr = value;
break;
case DSADR:
s->chan[channel].src = value;
break;
case DTADR:
s->chan[channel].dest = value;
break;
case DCMD:
s->chan[channel].cmd = value;
break;
default:
goto fail;
}
break;
}
fail:
cpu_abort(cpu_single_env, "%s: Bad offset " TARGET_FMT_plx "\n",
__FUNCTION__, offset);
}
}
static uint32_t pxa2xx_dma_readbad(void *opaque, target_phys_addr_t offset)
{
cpu_abort(cpu_single_env, "%s: Bad access width\n", __FUNCTION__);
return 5;
}
static void pxa2xx_dma_writebad(void *opaque,
target_phys_addr_t offset, uint32_t value)
{
cpu_abort(cpu_single_env, "%s: Bad access width\n", __FUNCTION__);
}
static CPUReadMemoryFunc *pxa2xx_dma_readfn[] = {
pxa2xx_dma_readbad,
pxa2xx_dma_readbad,
pxa2xx_dma_read
};
static CPUWriteMemoryFunc *pxa2xx_dma_writefn[] = {
pxa2xx_dma_writebad,
pxa2xx_dma_writebad,
pxa2xx_dma_write
};
static void pxa2xx_dma_save(QEMUFile *f, void *opaque)
{
struct pxa2xx_dma_state_s *s = (struct pxa2xx_dma_state_s *) opaque;
int i;
qemu_put_be32(f, s->channels);
qemu_put_be32s(f, &s->stopintr);
qemu_put_be32s(f, &s->eorintr);
qemu_put_be32s(f, &s->rasintr);
qemu_put_be32s(f, &s->startintr);
qemu_put_be32s(f, &s->endintr);
qemu_put_be32s(f, &s->align);
qemu_put_be32s(f, &s->pio);
qemu_put_buffer(f, s->req, PXA2XX_DMA_NUM_REQUESTS);
for (i = 0; i < s->channels; i ++) {
qemu_put_betl(f, s->chan[i].descr);
qemu_put_betl(f, s->chan[i].src);
qemu_put_betl(f, s->chan[i].dest);
qemu_put_be32s(f, &s->chan[i].cmd);
qemu_put_be32s(f, &s->chan[i].state);
qemu_put_be32(f, s->chan[i].request);
};
}
static int pxa2xx_dma_load(QEMUFile *f, void *opaque, int version_id)
{
struct pxa2xx_dma_state_s *s = (struct pxa2xx_dma_state_s *) opaque;
int i;
if (qemu_get_be32(f) != s->channels)
return -EINVAL;
qemu_get_be32s(f, &s->stopintr);
qemu_get_be32s(f, &s->eorintr);
qemu_get_be32s(f, &s->rasintr);
qemu_get_be32s(f, &s->startintr);
qemu_get_be32s(f, &s->endintr);
qemu_get_be32s(f, &s->align);
qemu_get_be32s(f, &s->pio);
qemu_get_buffer(f, s->req, PXA2XX_DMA_NUM_REQUESTS);
for (i = 0; i < s->channels; i ++) {
s->chan[i].descr = qemu_get_betl(f);
s->chan[i].src = qemu_get_betl(f);
s->chan[i].dest = qemu_get_betl(f);
qemu_get_be32s(f, &s->chan[i].cmd);
qemu_get_be32s(f, &s->chan[i].state);
s->chan[i].request = qemu_get_be32(f);
};
return 0;
}
static struct pxa2xx_dma_state_s *pxa2xx_dma_init(target_phys_addr_t base,
qemu_irq irq, int channels)
{
int i, iomemtype;
struct pxa2xx_dma_state_s *s;
s = (struct pxa2xx_dma_state_s *)
qemu_mallocz(sizeof(struct pxa2xx_dma_state_s));
s->channels = channels;
s->chan = qemu_mallocz(sizeof(struct pxa2xx_dma_channel_s) * s->channels);
s->base = base;
s->irq = irq;
s->handler = (pxa2xx_dma_handler_t) pxa2xx_dma_request;
s->req = qemu_mallocz(sizeof(uint8_t) * PXA2XX_DMA_NUM_REQUESTS);
memset(s->chan, 0, sizeof(struct pxa2xx_dma_channel_s) * s->channels);
for (i = 0; i < s->channels; i ++)
s->chan[i].state = DCSR_STOPINTR;
memset(s->req, 0, sizeof(uint8_t) * PXA2XX_DMA_NUM_REQUESTS);
iomemtype = cpu_register_io_memory(0, pxa2xx_dma_readfn,
pxa2xx_dma_writefn, s);
cpu_register_physical_memory(base, 0x00010000, iomemtype);
register_savevm("pxa2xx_dma", 0, 0, pxa2xx_dma_save, pxa2xx_dma_load, s);
return s;
}
struct pxa2xx_dma_state_s *pxa27x_dma_init(target_phys_addr_t base,
qemu_irq irq)
{
return pxa2xx_dma_init(base, irq, PXA27X_DMA_NUM_CHANNELS);
}
struct pxa2xx_dma_state_s *pxa255_dma_init(target_phys_addr_t base,
qemu_irq irq)
{
return pxa2xx_dma_init(base, irq, PXA255_DMA_NUM_CHANNELS);
}
void pxa2xx_dma_request(struct pxa2xx_dma_state_s *s, int req_num, int on)
{
int ch;
if (req_num < 0 || req_num >= PXA2XX_DMA_NUM_REQUESTS)
cpu_abort(cpu_single_env,
"%s: Bad DMA request %i\n", __FUNCTION__, req_num);
if (!(s->req[req_num] & DRCMR_MAPVLD))
return;
ch = s->req[req_num] & DRCMR_CHLNUM;
if (!s->chan[ch].request && on)
s->chan[ch].state |= DCSR_RASINTR;
else
s->chan[ch].state &= ~DCSR_RASINTR;
if (s->chan[ch].request && !on)
s->chan[ch].state |= DCSR_EORINT;
s->chan[ch].request = on;
if (on) {
pxa2xx_dma_run(s);
pxa2xx_dma_update(s, ch);
}
}
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