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* QEMU model of Xilinx AXI-DMA block.
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* Copyright (c) 2011 Edgar E. Iglesias.
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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#include "qemu/timer.h"
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#include "qdev-addr.h"
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#define R_DMACR (0x00 / 4)
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#define R_DMASR (0x04 / 4)
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#define R_CURDESC (0x08 / 4)
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#define R_TAILDESC (0x10 / 4)
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#define R_MAX (0x30 / 4)
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DMACR_TAILPTR_MODE = 2,
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DMASR_IOC_IRQ = 1 << 12,
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DMASR_DLY_IRQ = 1 << 13,
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DMASR_IRQ_MASK = 7 << 12
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uint64_t buffer_address;
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SDESC_CTRL_EOF = (1 << 26),
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SDESC_CTRL_SOF = (1 << 27),
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SDESC_CTRL_LEN_MASK = (1 << 23) - 1
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SDESC_STATUS_EOF = (1 << 26),
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SDESC_STATUS_SOF_BIT = 27,
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SDESC_STATUS_SOF = (1 << SDESC_STATUS_SOF_BIT),
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SDESC_STATUS_COMPLETE = (1 << 31)
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unsigned int complete_cnt;
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struct Stream streams[2];
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* Helper calls to extract info from desriptors and other trivial
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static inline int stream_desc_sof(struct SDesc *d)
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return d->control & SDESC_CTRL_SOF;
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static inline int stream_desc_eof(struct SDesc *d)
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return d->control & SDESC_CTRL_EOF;
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static inline int stream_resetting(struct Stream *s)
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return !!(s->regs[R_DMACR] & DMACR_RESET);
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static inline int stream_running(struct Stream *s)
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return s->regs[R_DMACR] & DMACR_RUNSTOP;
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static inline int stream_halted(struct Stream *s)
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return s->regs[R_DMASR] & DMASR_HALTED;
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static inline int stream_idle(struct Stream *s)
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return !!(s->regs[R_DMASR] & DMASR_IDLE);
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static void stream_reset(struct Stream *s)
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s->regs[R_DMASR] = DMASR_HALTED; /* starts up halted. */
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s->regs[R_DMACR] = 1 << 16; /* Starts with one in compl threshold. */
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/* Map an offset addr into a channel index. */
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static inline int streamid_from_addr(hwaddr addr)
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static void stream_desc_show(struct SDesc *d)
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qemu_log("buffer_addr = " PRIx64 "\n", d->buffer_address);
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qemu_log("nxtdesc = " PRIx64 "\n", d->nxtdesc);
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qemu_log("control = %x\n", d->control);
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qemu_log("status = %x\n", d->status);
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static void stream_desc_load(struct Stream *s, hwaddr addr)
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struct SDesc *d = &s->desc;
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cpu_physical_memory_read(addr, (void *) d, sizeof *d);
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/* Convert from LE into host endianness. */
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d->buffer_address = le64_to_cpu(d->buffer_address);
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d->nxtdesc = le64_to_cpu(d->nxtdesc);
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d->control = le32_to_cpu(d->control);
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d->status = le32_to_cpu(d->status);
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for (i = 0; i < ARRAY_SIZE(d->app); i++) {
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d->app[i] = le32_to_cpu(d->app[i]);
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static void stream_desc_store(struct Stream *s, hwaddr addr)
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struct SDesc *d = &s->desc;
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/* Convert from host endianness into LE. */
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d->buffer_address = cpu_to_le64(d->buffer_address);
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d->nxtdesc = cpu_to_le64(d->nxtdesc);
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d->control = cpu_to_le32(d->control);
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d->status = cpu_to_le32(d->status);
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for (i = 0; i < ARRAY_SIZE(d->app); i++) {
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d->app[i] = cpu_to_le32(d->app[i]);
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cpu_physical_memory_write(addr, (void *) d, sizeof *d);
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static void stream_update_irq(struct Stream *s)
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unsigned int pending, mask, irq;
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pending = s->regs[R_DMASR] & DMASR_IRQ_MASK;
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mask = s->regs[R_DMACR] & DMASR_IRQ_MASK;
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irq = pending & mask;
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qemu_set_irq(s->irq, !!irq);
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static void stream_reload_complete_cnt(struct Stream *s)
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unsigned int comp_th;
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comp_th = (s->regs[R_DMACR] >> 16) & 0xff;
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s->complete_cnt = comp_th;
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static void timer_hit(void *opaque)
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struct Stream *s = opaque;
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stream_reload_complete_cnt(s);
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s->regs[R_DMASR] |= DMASR_DLY_IRQ;
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stream_update_irq(s);
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static void stream_complete(struct Stream *s)
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unsigned int comp_delay;
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/* Start the delayed timer. */
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comp_delay = s->regs[R_DMACR] >> 24;
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ptimer_stop(s->ptimer);
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ptimer_set_count(s->ptimer, comp_delay);
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ptimer_run(s->ptimer, 1);
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if (s->complete_cnt == 0) {
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/* Raise the IOC irq. */
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s->regs[R_DMASR] |= DMASR_IOC_IRQ;
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stream_reload_complete_cnt(s);
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static void stream_process_mem2s(struct Stream *s,
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unsigned char txbuf[16 * 1024];
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if (!stream_running(s) || stream_idle(s)) {
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stream_desc_load(s, s->regs[R_CURDESC]);
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if (s->desc.status & SDESC_STATUS_COMPLETE) {
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s->regs[R_DMASR] |= DMASR_IDLE;
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if (stream_desc_sof(&s->desc)) {
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memcpy(app, s->desc.app, sizeof app);
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txlen = s->desc.control & SDESC_CTRL_LEN_MASK;
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if ((txlen + s->pos) > sizeof txbuf) {
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hw_error("%s: too small internal txbuf! %d\n", __func__,
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cpu_physical_memory_read(s->desc.buffer_address,
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txbuf + s->pos, txlen);
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if (stream_desc_eof(&s->desc)) {
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stream_push(tx_dev, txbuf, s->pos, app);
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/* Update the descriptor. */
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s->desc.status = txlen | SDESC_STATUS_COMPLETE;
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stream_desc_store(s, s->regs[R_CURDESC]);
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prev_d = s->regs[R_CURDESC];
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s->regs[R_CURDESC] = s->desc.nxtdesc;
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if (prev_d == s->regs[R_TAILDESC]) {
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s->regs[R_DMASR] |= DMASR_IDLE;
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static void stream_process_s2mem(struct Stream *s,
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unsigned char *buf, size_t len, uint32_t *app)
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if (!stream_running(s) || stream_idle(s)) {
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stream_desc_load(s, s->regs[R_CURDESC]);
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if (s->desc.status & SDESC_STATUS_COMPLETE) {
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s->regs[R_DMASR] |= DMASR_IDLE;
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rxlen = s->desc.control & SDESC_CTRL_LEN_MASK;
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cpu_physical_memory_write(s->desc.buffer_address, buf + pos, rxlen);
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/* Update the descriptor. */
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for (i = 0; i < 5; i++) {
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s->desc.app[i] = app[i];
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s->desc.status |= SDESC_STATUS_EOF;
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s->desc.status |= sof << SDESC_STATUS_SOF_BIT;
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s->desc.status |= SDESC_STATUS_COMPLETE;
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stream_desc_store(s, s->regs[R_CURDESC]);
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prev_d = s->regs[R_CURDESC];
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s->regs[R_CURDESC] = s->desc.nxtdesc;
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if (prev_d == s->regs[R_TAILDESC]) {
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s->regs[R_DMASR] |= DMASR_IDLE;
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axidma_push(StreamSlave *obj, unsigned char *buf, size_t len, uint32_t *app)
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struct XilinxAXIDMA *d = FROM_SYSBUS(typeof(*d), SYS_BUS_DEVICE(obj));
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struct Stream *s = &d->streams[1];
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hw_error("No stream app data!\n");
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stream_process_s2mem(s, buf, len, app);
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stream_update_irq(s);
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static uint64_t axidma_read(void *opaque, hwaddr addr,
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struct XilinxAXIDMA *d = opaque;
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sid = streamid_from_addr(addr);
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s = &d->streams[sid];
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/* Simulate one cycles reset delay. */
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s->regs[addr] &= ~DMACR_RESET;
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s->regs[addr] &= 0xffff;
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s->regs[addr] |= (s->complete_cnt & 0xff) << 16;
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s->regs[addr] |= (ptimer_get_count(s->ptimer) & 0xff) << 24;
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D(qemu_log("%s ch=%d addr=" TARGET_FMT_plx " v=%x\n",
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__func__, sid, addr * 4, r));
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static void axidma_write(void *opaque, hwaddr addr,
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uint64_t value, unsigned size)
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struct XilinxAXIDMA *d = opaque;
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sid = streamid_from_addr(addr);
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s = &d->streams[sid];
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/* Tailptr mode is always on. */
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value |= DMACR_TAILPTR_MODE;
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/* Remember our previous reset state. */
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value |= (s->regs[addr] & DMACR_RESET);
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s->regs[addr] = value;
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if (value & DMACR_RESET) {
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if ((value & 1) && !stream_resetting(s)) {
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/* Start processing. */
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s->regs[R_DMASR] &= ~(DMASR_HALTED | DMASR_IDLE);
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stream_reload_complete_cnt(s);
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/* Mask away write to clear irq lines. */
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value &= ~(value & DMASR_IRQ_MASK);
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s->regs[addr] = value;
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s->regs[addr] = value;
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s->regs[R_DMASR] &= ~DMASR_IDLE; /* Not idle. */
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stream_process_mem2s(s, d->tx_dev);
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D(qemu_log("%s: ch=%d addr=" TARGET_FMT_plx " v=%x\n",
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__func__, sid, addr * 4, (unsigned)value));
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s->regs[addr] = value;
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stream_update_irq(s);
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static const MemoryRegionOps axidma_ops = {
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.write = axidma_write,
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.endianness = DEVICE_NATIVE_ENDIAN,
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static int xilinx_axidma_init(SysBusDevice *dev)
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struct XilinxAXIDMA *s = FROM_SYSBUS(typeof(*s), dev);
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sysbus_init_irq(dev, &s->streams[0].irq);
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sysbus_init_irq(dev, &s->streams[1].irq);
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memory_region_init_io(&s->iomem, &axidma_ops, s,
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"xlnx.axi-dma", R_MAX * 4 * 2);
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sysbus_init_mmio(dev, &s->iomem);
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for (i = 0; i < 2; i++) {
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stream_reset(&s->streams[i]);
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s->streams[i].nr = i;
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s->streams[i].bh = qemu_bh_new(timer_hit, &s->streams[i]);
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s->streams[i].ptimer = ptimer_init(s->streams[i].bh);
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ptimer_set_freq(s->streams[i].ptimer, s->freqhz);
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static void xilinx_axidma_initfn(Object *obj)
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struct XilinxAXIDMA *s = FROM_SYSBUS(typeof(*s), SYS_BUS_DEVICE(obj));
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object_property_add_link(obj, "axistream-connected", TYPE_STREAM_SLAVE,
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(Object **) &s->tx_dev, NULL);
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static Property axidma_properties[] = {
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DEFINE_PROP_UINT32("freqhz", struct XilinxAXIDMA, freqhz, 50000000),
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DEFINE_PROP_END_OF_LIST(),
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static void axidma_class_init(ObjectClass *klass, void *data)
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DeviceClass *dc = DEVICE_CLASS(klass);
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SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
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StreamSlaveClass *ssc = STREAM_SLAVE_CLASS(klass);
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k->init = xilinx_axidma_init;
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dc->props = axidma_properties;
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ssc->push = axidma_push;
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static const TypeInfo axidma_info = {
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.name = "xlnx.axi-dma",
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.parent = TYPE_SYS_BUS_DEVICE,
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.instance_size = sizeof(struct XilinxAXIDMA),
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.class_init = axidma_class_init,
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.instance_init = xilinx_axidma_initfn,
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.interfaces = (InterfaceInfo[]) {
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{ TYPE_STREAM_SLAVE },
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static void xilinx_axidma_register_types(void)
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type_register_static(&axidma_info);
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type_init(xilinx_axidma_register_types)