root / hw / pxa2xx_dma.c @ aa941b94
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/*
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* Intel XScale PXA255/270 DMA controller.
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*
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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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*
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* This code is licenced under the GPL.
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*/
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#include "vl.h" |
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|
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struct pxa2xx_dma_channel_s {
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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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uint32_t cmd; |
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uint32_t state; |
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int request;
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}; |
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/* Allow the DMA to be used as a PIC. */
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typedef void (*pxa2xx_dma_handler_t)(void *opaque, int irq, int level); |
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struct pxa2xx_dma_state_s {
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pxa2xx_dma_handler_t handler; |
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target_phys_addr_t base; |
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qemu_irq irq; |
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|
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uint32_t stopintr; |
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uint32_t eorintr; |
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uint32_t rasintr; |
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uint32_t startintr; |
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uint32_t endintr; |
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uint32_t align; |
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uint32_t pio; |
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int channels;
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struct pxa2xx_dma_channel_s *chan;
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uint8_t *req; |
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/* Flag to avoid recursive DMA invocations. */
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int running;
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}; |
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#define PXA255_DMA_NUM_CHANNELS 16 |
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#define PXA27X_DMA_NUM_CHANNELS 32 |
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|
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#define PXA2XX_DMA_NUM_REQUESTS 75 |
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|
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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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|
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/* Per-channel register */
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#define DDADR 0x00 |
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#define DSADR 0x01 |
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#define DTADR 0x02 |
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#define DCMD 0x03 |
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|
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/* Bit-field masks */
|
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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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|
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static inline void pxa2xx_dma_update(struct pxa2xx_dma_state_s *s, int ch) |
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{ |
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if (ch >= 0) { |
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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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else
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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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else
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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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else
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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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else
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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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else
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s->endintr &= ~(1 << ch);
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} |
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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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else
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qemu_irq_lower(s->irq); |
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} |
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|
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static inline void pxa2xx_dma_descriptor_fetch( |
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struct pxa2xx_dma_state_s *s, int ch) |
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{ |
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uint32_t desc[4];
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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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daddr += 32;
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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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} |
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static void pxa2xx_dma_run(struct pxa2xx_dma_state_s *s) |
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{ |
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int c, srcinc, destinc;
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uint32_t n, size; |
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uint32_t width; |
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uint32_t length; |
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char buffer[32]; |
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struct pxa2xx_dma_channel_s *ch;
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if (s->running ++)
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return;
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while (s->running) {
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s->running = 1;
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for (c = 0; c < s->channels; c ++) { |
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ch = &s->chan[c]; |
189 |
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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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break;
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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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while (length) {
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size = MIN(length, size); |
204 |
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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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ch->src += srcinc; |
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} |
209 |
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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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ch->dest += destinc; |
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} |
214 |
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length -= size; |
216 |
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if ((ch->cmd & (DCMD_FLOWSRC | DCMD_FLOWTRG)) &&
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!ch->request) { |
219 |
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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break;
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} |
227 |
} |
228 |
|
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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 (!length) {
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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; |
241 |
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break;
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} |
244 |
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ch->state |= DCSR_STOPINTR; |
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break;
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} |
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} |
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} |
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s->running --; |
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} |
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} |
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static uint32_t pxa2xx_dma_read(void *opaque, target_phys_addr_t offset) |
256 |
{ |
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struct pxa2xx_dma_state_s *s = (struct pxa2xx_dma_state_s *) opaque; |
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unsigned int channel; |
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offset -= s->base; |
260 |
|
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switch (offset) {
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case DRCMR64 ... DRCMR74:
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offset -= DRCMR64 - DRCMR0 - (64 << 2); |
264 |
/* Fall through */
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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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|
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case DRQSR0:
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case DRQSR1:
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case DRQSR2:
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return 0; |
273 |
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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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279 |
|
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case DINT:
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return s->stopintr | s->eorintr | s->rasintr |
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s->startintr | s->endintr; |
283 |
|
284 |
case DALGN:
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return s->align;
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286 |
|
287 |
case DPCSR:
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return s->pio;
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} |
290 |
|
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if (offset >= D_CH0 && offset < D_CH0 + (s->channels << 4)) { |
292 |
channel = (offset - D_CH0) >> 4;
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293 |
switch ((offset & 0x0f) >> 2) { |
294 |
case DDADR:
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return s->chan[channel].descr;
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296 |
case DSADR:
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return s->chan[channel].src;
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298 |
case DTADR:
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return s->chan[channel].dest;
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300 |
case DCMD:
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301 |
return s->chan[channel].cmd;
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302 |
} |
303 |
} |
304 |
|
305 |
cpu_abort(cpu_single_env, |
306 |
"%s: Bad offset 0x%04lx\n", __FUNCTION__, offset);
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return 7; |
308 |
} |
309 |
|
310 |
static void pxa2xx_dma_write(void *opaque, |
311 |
target_phys_addr_t offset, uint32_t value) |
312 |
{ |
313 |
struct pxa2xx_dma_state_s *s = (struct pxa2xx_dma_state_s *) opaque; |
314 |
unsigned int channel; |
315 |
offset -= s->base; |
316 |
|
317 |
switch (offset) {
|
318 |
case DRCMR64 ... DRCMR74:
|
319 |
offset -= DRCMR64 - DRCMR0 - (64 << 2); |
320 |
/* Fall through */
|
321 |
case DRCMR0 ... DRCMR63:
|
322 |
channel = (offset - DRCMR0) >> 2;
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323 |
|
324 |
if (value & DRCMR_MAPVLD)
|
325 |
if ((value & DRCMR_CHLNUM) > s->channels)
|
326 |
cpu_abort(cpu_single_env, "%s: Bad DMA channel %i\n",
|
327 |
__FUNCTION__, value & DRCMR_CHLNUM); |
328 |
|
329 |
s->req[channel] = value; |
330 |
break;
|
331 |
|
332 |
case DRQSR0:
|
333 |
case DRQSR1:
|
334 |
case DRQSR2:
|
335 |
/* Nothing to do */
|
336 |
break;
|
337 |
|
338 |
case DCSR0 ... DCSR31:
|
339 |
channel = offset >> 2;
|
340 |
s->chan[channel].state &= 0x0000071f & ~(value &
|
341 |
(DCSR_EORINT | DCSR_ENDINTR | |
342 |
DCSR_STARTINTR | DCSR_BUSERRINTR)); |
343 |
s->chan[channel].state |= value & 0xfc800000;
|
344 |
|
345 |
if (s->chan[channel].state & DCSR_STOPIRQEN)
|
346 |
s->chan[channel].state &= ~DCSR_STOPINTR; |
347 |
|
348 |
if (value & DCSR_NODESCFETCH) {
|
349 |
/* No-descriptor-fetch mode */
|
350 |
if (value & DCSR_RUN)
|
351 |
pxa2xx_dma_run(s); |
352 |
} else {
|
353 |
/* Descriptor-fetch mode */
|
354 |
if (value & DCSR_RUN) {
|
355 |
s->chan[channel].state &= ~DCSR_STOPINTR; |
356 |
pxa2xx_dma_descriptor_fetch(s, channel); |
357 |
pxa2xx_dma_run(s); |
358 |
} |
359 |
} |
360 |
|
361 |
/* Shouldn't matter as our DMA is synchronous. */
|
362 |
if (!(value & (DCSR_RUN | DCSR_MASKRUN)))
|
363 |
s->chan[channel].state |= DCSR_STOPINTR; |
364 |
|
365 |
if (value & DCSR_CLRCMPST)
|
366 |
s->chan[channel].state &= ~DCSR_CMPST; |
367 |
if (value & DCSR_SETCMPST)
|
368 |
s->chan[channel].state |= DCSR_CMPST; |
369 |
|
370 |
pxa2xx_dma_update(s, channel); |
371 |
break;
|
372 |
|
373 |
case DALGN:
|
374 |
s->align = value; |
375 |
break;
|
376 |
|
377 |
case DPCSR:
|
378 |
s->pio = value & 0x80000001;
|
379 |
break;
|
380 |
|
381 |
default:
|
382 |
if (offset >= D_CH0 && offset < D_CH0 + (s->channels << 4)) { |
383 |
channel = (offset - D_CH0) >> 4;
|
384 |
switch ((offset & 0x0f) >> 2) { |
385 |
case DDADR:
|
386 |
s->chan[channel].descr = value; |
387 |
break;
|
388 |
case DSADR:
|
389 |
s->chan[channel].src = value; |
390 |
break;
|
391 |
case DTADR:
|
392 |
s->chan[channel].dest = value; |
393 |
break;
|
394 |
case DCMD:
|
395 |
s->chan[channel].cmd = value; |
396 |
break;
|
397 |
default:
|
398 |
goto fail;
|
399 |
} |
400 |
|
401 |
break;
|
402 |
} |
403 |
fail:
|
404 |
cpu_abort(cpu_single_env, "%s: Bad offset 0x%04lx\n",
|
405 |
__FUNCTION__, offset); |
406 |
} |
407 |
} |
408 |
|
409 |
static uint32_t pxa2xx_dma_readbad(void *opaque, target_phys_addr_t offset) |
410 |
{ |
411 |
cpu_abort(cpu_single_env, "%s: Bad access width\n", __FUNCTION__);
|
412 |
return 5; |
413 |
} |
414 |
|
415 |
static void pxa2xx_dma_writebad(void *opaque, |
416 |
target_phys_addr_t offset, uint32_t value) |
417 |
{ |
418 |
cpu_abort(cpu_single_env, "%s: Bad access width\n", __FUNCTION__);
|
419 |
} |
420 |
|
421 |
static CPUReadMemoryFunc *pxa2xx_dma_readfn[] = {
|
422 |
pxa2xx_dma_readbad, |
423 |
pxa2xx_dma_readbad, |
424 |
pxa2xx_dma_read |
425 |
}; |
426 |
|
427 |
static CPUWriteMemoryFunc *pxa2xx_dma_writefn[] = {
|
428 |
pxa2xx_dma_writebad, |
429 |
pxa2xx_dma_writebad, |
430 |
pxa2xx_dma_write |
431 |
}; |
432 |
|
433 |
static void pxa2xx_dma_save(QEMUFile *f, void *opaque) |
434 |
{ |
435 |
struct pxa2xx_dma_state_s *s = (struct pxa2xx_dma_state_s *) opaque; |
436 |
int i;
|
437 |
|
438 |
qemu_put_be32(f, s->channels); |
439 |
|
440 |
qemu_put_be32s(f, &s->stopintr); |
441 |
qemu_put_be32s(f, &s->eorintr); |
442 |
qemu_put_be32s(f, &s->rasintr); |
443 |
qemu_put_be32s(f, &s->startintr); |
444 |
qemu_put_be32s(f, &s->endintr); |
445 |
qemu_put_be32s(f, &s->align); |
446 |
qemu_put_be32s(f, &s->pio); |
447 |
|
448 |
qemu_put_buffer(f, s->req, PXA2XX_DMA_NUM_REQUESTS); |
449 |
for (i = 0; i < s->channels; i ++) { |
450 |
qemu_put_betl(f, s->chan[i].descr); |
451 |
qemu_put_betl(f, s->chan[i].src); |
452 |
qemu_put_betl(f, s->chan[i].dest); |
453 |
qemu_put_be32s(f, &s->chan[i].cmd); |
454 |
qemu_put_be32s(f, &s->chan[i].state); |
455 |
qemu_put_be32(f, s->chan[i].request); |
456 |
}; |
457 |
} |
458 |
|
459 |
static int pxa2xx_dma_load(QEMUFile *f, void *opaque, int version_id) |
460 |
{ |
461 |
struct pxa2xx_dma_state_s *s = (struct pxa2xx_dma_state_s *) opaque; |
462 |
int i;
|
463 |
|
464 |
if (qemu_get_be32(f) != s->channels)
|
465 |
return -EINVAL;
|
466 |
|
467 |
qemu_get_be32s(f, &s->stopintr); |
468 |
qemu_get_be32s(f, &s->eorintr); |
469 |
qemu_get_be32s(f, &s->rasintr); |
470 |
qemu_get_be32s(f, &s->startintr); |
471 |
qemu_get_be32s(f, &s->endintr); |
472 |
qemu_get_be32s(f, &s->align); |
473 |
qemu_get_be32s(f, &s->pio); |
474 |
|
475 |
qemu_get_buffer(f, s->req, PXA2XX_DMA_NUM_REQUESTS); |
476 |
for (i = 0; i < s->channels; i ++) { |
477 |
s->chan[i].descr = qemu_get_betl(f); |
478 |
s->chan[i].src = qemu_get_betl(f); |
479 |
s->chan[i].dest = qemu_get_betl(f); |
480 |
qemu_get_be32s(f, &s->chan[i].cmd); |
481 |
qemu_get_be32s(f, &s->chan[i].state); |
482 |
s->chan[i].request = qemu_get_be32(f); |
483 |
}; |
484 |
|
485 |
return 0; |
486 |
} |
487 |
|
488 |
static struct pxa2xx_dma_state_s *pxa2xx_dma_init(target_phys_addr_t base, |
489 |
qemu_irq irq, int channels)
|
490 |
{ |
491 |
int i, iomemtype;
|
492 |
struct pxa2xx_dma_state_s *s;
|
493 |
s = (struct pxa2xx_dma_state_s *)
|
494 |
qemu_mallocz(sizeof(struct pxa2xx_dma_state_s)); |
495 |
|
496 |
s->channels = channels; |
497 |
s->chan = qemu_mallocz(sizeof(struct pxa2xx_dma_channel_s) * s->channels); |
498 |
s->base = base; |
499 |
s->irq = irq; |
500 |
s->handler = (pxa2xx_dma_handler_t) pxa2xx_dma_request; |
501 |
s->req = qemu_mallocz(sizeof(uint8_t) * PXA2XX_DMA_NUM_REQUESTS);
|
502 |
|
503 |
memset(s->chan, 0, sizeof(struct pxa2xx_dma_channel_s) * s->channels); |
504 |
for (i = 0; i < s->channels; i ++) |
505 |
s->chan[i].state = DCSR_STOPINTR; |
506 |
|
507 |
memset(s->req, 0, sizeof(uint8_t) * PXA2XX_DMA_NUM_REQUESTS); |
508 |
|
509 |
iomemtype = cpu_register_io_memory(0, pxa2xx_dma_readfn,
|
510 |
pxa2xx_dma_writefn, s); |
511 |
cpu_register_physical_memory(base, 0x0000ffff, iomemtype);
|
512 |
|
513 |
register_savevm("pxa2xx_dma", 0, 0, pxa2xx_dma_save, pxa2xx_dma_load, s); |
514 |
|
515 |
return s;
|
516 |
} |
517 |
|
518 |
struct pxa2xx_dma_state_s *pxa27x_dma_init(target_phys_addr_t base,
|
519 |
qemu_irq irq) |
520 |
{ |
521 |
return pxa2xx_dma_init(base, irq, PXA27X_DMA_NUM_CHANNELS);
|
522 |
} |
523 |
|
524 |
struct pxa2xx_dma_state_s *pxa255_dma_init(target_phys_addr_t base,
|
525 |
qemu_irq irq) |
526 |
{ |
527 |
return pxa2xx_dma_init(base, irq, PXA255_DMA_NUM_CHANNELS);
|
528 |
} |
529 |
|
530 |
void pxa2xx_dma_request(struct pxa2xx_dma_state_s *s, int req_num, int on) |
531 |
{ |
532 |
int ch;
|
533 |
if (req_num < 0 || req_num >= PXA2XX_DMA_NUM_REQUESTS) |
534 |
cpu_abort(cpu_single_env, |
535 |
"%s: Bad DMA request %i\n", __FUNCTION__, req_num);
|
536 |
|
537 |
if (!(s->req[req_num] & DRCMR_MAPVLD))
|
538 |
return;
|
539 |
ch = s->req[req_num] & DRCMR_CHLNUM; |
540 |
|
541 |
if (!s->chan[ch].request && on)
|
542 |
s->chan[ch].state |= DCSR_RASINTR; |
543 |
else
|
544 |
s->chan[ch].state &= ~DCSR_RASINTR; |
545 |
if (s->chan[ch].request && !on)
|
546 |
s->chan[ch].state |= DCSR_EORINT; |
547 |
|
548 |
s->chan[ch].request = on; |
549 |
if (on) {
|
550 |
pxa2xx_dma_run(s); |
551 |
pxa2xx_dma_update(s, ch); |
552 |
} |
553 |
} |