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* Intel XScale PXA255/270 DMA controller.
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* Copyright (c) 2006 Openedhand Ltd.
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* Copyright (c) 2006 Thorsten Zitterell
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* Written by Andrzej Zaborowski <balrog@zabor.org>
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* This code is licensed under the GPL.
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#define PXA255_DMA_NUM_CHANNELS 16
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#define PXA27X_DMA_NUM_CHANNELS 32
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#define PXA2XX_DMA_NUM_REQUESTS 75
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target_phys_addr_t descr;
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target_phys_addr_t src;
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target_phys_addr_t dest;
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typedef struct PXA2xxDMAState {
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PXA2xxDMAChannel *chan;
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uint8_t req[PXA2XX_DMA_NUM_REQUESTS];
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/* Flag to avoid recursive DMA invocations. */
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#define DCSR0 0x0000 /* DMA Control / Status register for Channel 0 */
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#define DCSR31 0x007c /* DMA Control / Status register for Channel 31 */
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#define DALGN 0x00a0 /* DMA Alignment register */
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#define DPCSR 0x00a4 /* DMA Programmed I/O Control Status register */
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#define DRQSR0 0x00e0 /* DMA DREQ<0> Status register */
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#define DRQSR1 0x00e4 /* DMA DREQ<1> Status register */
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#define DRQSR2 0x00e8 /* DMA DREQ<2> Status register */
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#define DINT 0x00f0 /* DMA Interrupt register */
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#define DRCMR0 0x0100 /* Request to Channel Map register 0 */
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#define DRCMR63 0x01fc /* Request to Channel Map register 63 */
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#define D_CH0 0x0200 /* Channel 0 Descriptor start */
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#define DRCMR64 0x1100 /* Request to Channel Map register 64 */
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#define DRCMR74 0x1128 /* Request to Channel Map register 74 */
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/* Per-channel register */
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#define DRCMR_CHLNUM 0x1f
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#define DRCMR_MAPVLD (1 << 7)
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#define DDADR_STOP (1 << 0)
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#define DDADR_BREN (1 << 1)
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#define DCMD_LEN 0x1fff
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#define DCMD_WIDTH(x) (1 << ((((x) >> 14) & 3) - 1))
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#define DCMD_SIZE(x) (4 << (((x) >> 16) & 3))
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#define DCMD_FLYBYT (1 << 19)
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#define DCMD_FLYBYS (1 << 20)
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#define DCMD_ENDIRQEN (1 << 21)
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#define DCMD_STARTIRQEN (1 << 22)
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#define DCMD_CMPEN (1 << 25)
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#define DCMD_FLOWTRG (1 << 28)
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#define DCMD_FLOWSRC (1 << 29)
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#define DCMD_INCTRGADDR (1 << 30)
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#define DCMD_INCSRCADDR (1 << 31)
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#define DCSR_BUSERRINTR (1 << 0)
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#define DCSR_STARTINTR (1 << 1)
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#define DCSR_ENDINTR (1 << 2)
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#define DCSR_STOPINTR (1 << 3)
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#define DCSR_RASINTR (1 << 4)
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#define DCSR_REQPEND (1 << 8)
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#define DCSR_EORINT (1 << 9)
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#define DCSR_CMPST (1 << 10)
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#define DCSR_MASKRUN (1 << 22)
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#define DCSR_RASIRQEN (1 << 23)
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#define DCSR_CLRCMPST (1 << 24)
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#define DCSR_SETCMPST (1 << 25)
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#define DCSR_EORSTOPEN (1 << 26)
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#define DCSR_EORJMPEN (1 << 27)
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#define DCSR_EORIRQEN (1 << 28)
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#define DCSR_STOPIRQEN (1 << 29)
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#define DCSR_NODESCFETCH (1 << 30)
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#define DCSR_RUN (1 << 31)
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static inline void pxa2xx_dma_update(PXA2xxDMAState *s, int ch)
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if ((s->chan[ch].state & DCSR_STOPIRQEN) &&
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(s->chan[ch].state & DCSR_STOPINTR))
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s->stopintr |= 1 << ch;
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s->stopintr &= ~(1 << ch);
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if ((s->chan[ch].state & DCSR_EORIRQEN) &&
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(s->chan[ch].state & DCSR_EORINT))
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s->eorintr |= 1 << ch;
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s->eorintr &= ~(1 << ch);
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if ((s->chan[ch].state & DCSR_RASIRQEN) &&
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(s->chan[ch].state & DCSR_RASINTR))
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s->rasintr |= 1 << ch;
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s->rasintr &= ~(1 << ch);
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if (s->chan[ch].state & DCSR_STARTINTR)
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s->startintr |= 1 << ch;
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s->startintr &= ~(1 << ch);
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if (s->chan[ch].state & DCSR_ENDINTR)
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s->endintr |= 1 << ch;
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s->endintr &= ~(1 << ch);
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if (s->stopintr | s->eorintr | s->rasintr | s->startintr | s->endintr)
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qemu_irq_raise(s->irq);
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qemu_irq_lower(s->irq);
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static inline void pxa2xx_dma_descriptor_fetch(
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PXA2xxDMAState *s, int ch)
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target_phys_addr_t daddr = s->chan[ch].descr & ~0xf;
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if ((s->chan[ch].descr & DDADR_BREN) && (s->chan[ch].state & DCSR_CMPST))
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cpu_physical_memory_read(daddr, (uint8_t *) desc, 16);
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s->chan[ch].descr = desc[DDADR];
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s->chan[ch].src = desc[DSADR];
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s->chan[ch].dest = desc[DTADR];
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s->chan[ch].cmd = desc[DCMD];
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if (s->chan[ch].cmd & DCMD_FLOWSRC)
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s->chan[ch].src &= ~3;
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if (s->chan[ch].cmd & DCMD_FLOWTRG)
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s->chan[ch].dest &= ~3;
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if (s->chan[ch].cmd & (DCMD_CMPEN | DCMD_FLYBYS | DCMD_FLYBYT))
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printf("%s: unsupported mode in channel %i\n", __FUNCTION__, ch);
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if (s->chan[ch].cmd & DCMD_STARTIRQEN)
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s->chan[ch].state |= DCSR_STARTINTR;
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static void pxa2xx_dma_run(PXA2xxDMAState *s)
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int c, srcinc, destinc;
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PXA2xxDMAChannel *ch;
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for (c = 0; c < s->channels; c ++) {
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while ((ch->state & DCSR_RUN) && !(ch->state & DCSR_STOPINTR)) {
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/* Test for pending requests */
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if ((ch->cmd & (DCMD_FLOWSRC | DCMD_FLOWTRG)) && !ch->request)
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length = ch->cmd & DCMD_LEN;
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size = DCMD_SIZE(ch->cmd);
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width = DCMD_WIDTH(ch->cmd);
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srcinc = (ch->cmd & DCMD_INCSRCADDR) ? width : 0;
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destinc = (ch->cmd & DCMD_INCTRGADDR) ? width : 0;
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size = MIN(length, size);
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for (n = 0; n < size; n += width) {
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cpu_physical_memory_read(ch->src, buffer + n, width);
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for (n = 0; n < size; n += width) {
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cpu_physical_memory_write(ch->dest, buffer + n, width);
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if ((ch->cmd & (DCMD_FLOWSRC | DCMD_FLOWTRG)) &&
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ch->state |= DCSR_EORINT;
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if (ch->state & DCSR_EORSTOPEN)
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ch->state |= DCSR_STOPINTR;
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if ((ch->state & DCSR_EORJMPEN) &&
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!(ch->state & DCSR_NODESCFETCH))
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pxa2xx_dma_descriptor_fetch(s, c);
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ch->cmd = (ch->cmd & ~DCMD_LEN) | length;
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/* Is the transfer complete now? */
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if (ch->cmd & DCMD_ENDIRQEN)
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ch->state |= DCSR_ENDINTR;
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if ((ch->state & DCSR_NODESCFETCH) ||
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(ch->descr & DDADR_STOP) ||
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(ch->state & DCSR_EORSTOPEN)) {
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ch->state |= DCSR_STOPINTR;
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ch->state &= ~DCSR_RUN;
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ch->state |= DCSR_STOPINTR;
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static uint32_t pxa2xx_dma_read(void *opaque, target_phys_addr_t offset)
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PXA2xxDMAState *s = (PXA2xxDMAState *) opaque;
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unsigned int channel;
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case DRCMR64 ... DRCMR74:
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offset -= DRCMR64 - DRCMR0 - (64 << 2);
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case DRCMR0 ... DRCMR63:
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channel = (offset - DRCMR0) >> 2;
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return s->req[channel];
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case DCSR0 ... DCSR31:
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channel = offset >> 2;
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if (s->chan[channel].request)
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return s->chan[channel].state | DCSR_REQPEND;
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return s->chan[channel].state;
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return s->stopintr | s->eorintr | s->rasintr |
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s->startintr | s->endintr;
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if (offset >= D_CH0 && offset < D_CH0 + (s->channels << 4)) {
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channel = (offset - D_CH0) >> 4;
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switch ((offset & 0x0f) >> 2) {
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return s->chan[channel].descr;
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return s->chan[channel].src;
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return s->chan[channel].dest;
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return s->chan[channel].cmd;
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hw_error("%s: Bad offset 0x" TARGET_FMT_plx "\n", __FUNCTION__, offset);
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static void pxa2xx_dma_write(void *opaque,
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target_phys_addr_t offset, uint32_t value)
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PXA2xxDMAState *s = (PXA2xxDMAState *) opaque;
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unsigned int channel;
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case DRCMR64 ... DRCMR74:
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offset -= DRCMR64 - DRCMR0 - (64 << 2);
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case DRCMR0 ... DRCMR63:
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channel = (offset - DRCMR0) >> 2;
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if (value & DRCMR_MAPVLD)
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if ((value & DRCMR_CHLNUM) > s->channels)
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hw_error("%s: Bad DMA channel %i\n",
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__FUNCTION__, value & DRCMR_CHLNUM);
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s->req[channel] = value;
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case DCSR0 ... DCSR31:
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channel = offset >> 2;
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s->chan[channel].state &= 0x0000071f & ~(value &
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(DCSR_EORINT | DCSR_ENDINTR |
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DCSR_STARTINTR | DCSR_BUSERRINTR));
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s->chan[channel].state |= value & 0xfc800000;
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if (s->chan[channel].state & DCSR_STOPIRQEN)
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s->chan[channel].state &= ~DCSR_STOPINTR;
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if (value & DCSR_NODESCFETCH) {
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/* No-descriptor-fetch mode */
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if (value & DCSR_RUN) {
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s->chan[channel].state &= ~DCSR_STOPINTR;
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/* Descriptor-fetch mode */
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if (value & DCSR_RUN) {
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s->chan[channel].state &= ~DCSR_STOPINTR;
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pxa2xx_dma_descriptor_fetch(s, channel);
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/* Shouldn't matter as our DMA is synchronous. */
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if (!(value & (DCSR_RUN | DCSR_MASKRUN)))
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s->chan[channel].state |= DCSR_STOPINTR;
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if (value & DCSR_CLRCMPST)
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s->chan[channel].state &= ~DCSR_CMPST;
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if (value & DCSR_SETCMPST)
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s->chan[channel].state |= DCSR_CMPST;
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pxa2xx_dma_update(s, channel);
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s->pio = value & 0x80000001;
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if (offset >= D_CH0 && offset < D_CH0 + (s->channels << 4)) {
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channel = (offset - D_CH0) >> 4;
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switch ((offset & 0x0f) >> 2) {
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s->chan[channel].descr = value;
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s->chan[channel].src = value;
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s->chan[channel].dest = value;
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s->chan[channel].cmd = value;
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hw_error("%s: Bad offset " TARGET_FMT_plx "\n", __FUNCTION__, offset);
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static uint32_t pxa2xx_dma_readbad(void *opaque, target_phys_addr_t offset)
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hw_error("%s: Bad access width\n", __FUNCTION__);
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static void pxa2xx_dma_writebad(void *opaque,
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target_phys_addr_t offset, uint32_t value)
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hw_error("%s: Bad access width\n", __FUNCTION__);
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static CPUReadMemoryFunc * const pxa2xx_dma_readfn[] = {
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static CPUWriteMemoryFunc * const pxa2xx_dma_writefn[] = {
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static void pxa2xx_dma_request(void *opaque, int req_num, int on)
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PXA2xxDMAState *s = opaque;
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if (req_num < 0 || req_num >= PXA2XX_DMA_NUM_REQUESTS)
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hw_error("%s: Bad DMA request %i\n", __FUNCTION__, req_num);
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if (!(s->req[req_num] & DRCMR_MAPVLD))
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ch = s->req[req_num] & DRCMR_CHLNUM;
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if (!s->chan[ch].request && on)
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s->chan[ch].state |= DCSR_RASINTR;
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s->chan[ch].state &= ~DCSR_RASINTR;
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if (s->chan[ch].request && !on)
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s->chan[ch].state |= DCSR_EORINT;
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s->chan[ch].request = on;
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pxa2xx_dma_update(s, ch);
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static int pxa2xx_dma_init(SysBusDevice *dev)
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s = FROM_SYSBUS(PXA2xxDMAState, dev);
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if (s->channels <= 0) {
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s->chan = g_malloc0(sizeof(PXA2xxDMAChannel) * s->channels);
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memset(s->chan, 0, sizeof(PXA2xxDMAChannel) * s->channels);
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for (i = 0; i < s->channels; i ++)
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s->chan[i].state = DCSR_STOPINTR;
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memset(s->req, 0, sizeof(uint8_t) * PXA2XX_DMA_NUM_REQUESTS);
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qdev_init_gpio_in(&dev->qdev, pxa2xx_dma_request, PXA2XX_DMA_NUM_REQUESTS);
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iomemtype = cpu_register_io_memory(pxa2xx_dma_readfn,
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pxa2xx_dma_writefn, s, DEVICE_NATIVE_ENDIAN);
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sysbus_init_mmio(dev, 0x00010000, iomemtype);
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sysbus_init_irq(dev, &s->irq);
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DeviceState *pxa27x_dma_init(target_phys_addr_t base, qemu_irq irq)
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dev = qdev_create(NULL, "pxa2xx-dma");
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qdev_prop_set_int32(dev, "channels", PXA27X_DMA_NUM_CHANNELS);
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qdev_init_nofail(dev);
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sysbus_mmio_map(sysbus_from_qdev(dev), 0, base);
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sysbus_connect_irq(sysbus_from_qdev(dev), 0, irq);
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DeviceState *pxa255_dma_init(target_phys_addr_t base, qemu_irq irq)
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dev = qdev_create(NULL, "pxa2xx-dma");
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qdev_prop_set_int32(dev, "channels", PXA27X_DMA_NUM_CHANNELS);
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qdev_init_nofail(dev);
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sysbus_mmio_map(sysbus_from_qdev(dev), 0, base);
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sysbus_connect_irq(sysbus_from_qdev(dev), 0, irq);
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static bool is_version_0(void *opaque, int version_id)
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return version_id == 0;
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static VMStateDescription vmstate_pxa2xx_dma_chan = {
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.name = "pxa2xx_dma_chan",
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.minimum_version_id = 1,
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.minimum_version_id_old = 1,
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.fields = (VMStateField[]) {
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VMSTATE_UINTTL(descr, PXA2xxDMAChannel),
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VMSTATE_UINTTL(src, PXA2xxDMAChannel),
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VMSTATE_UINTTL(dest, PXA2xxDMAChannel),
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VMSTATE_UINT32(cmd, PXA2xxDMAChannel),
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VMSTATE_UINT32(state, PXA2xxDMAChannel),
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VMSTATE_INT32(request, PXA2xxDMAChannel),
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VMSTATE_END_OF_LIST(),
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static VMStateDescription vmstate_pxa2xx_dma = {
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.name = "pxa2xx_dma",
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.minimum_version_id = 0,
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.minimum_version_id_old = 0,
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.fields = (VMStateField[]) {
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VMSTATE_UNUSED_TEST(is_version_0, 4),
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VMSTATE_UINT32(stopintr, PXA2xxDMAState),
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VMSTATE_UINT32(eorintr, PXA2xxDMAState),
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VMSTATE_UINT32(rasintr, PXA2xxDMAState),
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VMSTATE_UINT32(startintr, PXA2xxDMAState),
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VMSTATE_UINT32(endintr, PXA2xxDMAState),
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VMSTATE_UINT32(align, PXA2xxDMAState),
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VMSTATE_UINT32(pio, PXA2xxDMAState),
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VMSTATE_BUFFER(req, PXA2xxDMAState),
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VMSTATE_STRUCT_VARRAY_POINTER_INT32(chan, PXA2xxDMAState, channels,
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vmstate_pxa2xx_dma_chan, PXA2xxDMAChannel),
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VMSTATE_END_OF_LIST(),
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static SysBusDeviceInfo pxa2xx_dma_info = {
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.init = pxa2xx_dma_init,
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.qdev.name = "pxa2xx-dma",
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.qdev.desc = "PXA2xx DMA controller",
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.qdev.size = sizeof(PXA2xxDMAState),
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.qdev.vmsd = &vmstate_pxa2xx_dma,
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.qdev.props = (Property[]) {
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DEFINE_PROP_INT32("channels", PXA2xxDMAState, channels, -1),
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DEFINE_PROP_END_OF_LIST(),
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static void pxa2xx_dma_register(void)
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sysbus_register_withprop(&pxa2xx_dma_info);
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device_init(pxa2xx_dma_register);