vhost-vdpa: Set discarding of RAM broken when initializing the backend
[qemu/kevin.git] / hw / dma / xlnx_csu_dma.c
blob896bb3574ddf3feddfdc4447dcffef816a99395e
1 /*
2 * Xilinx Platform CSU Stream DMA emulation
4 * This implementation is based on
5 * https://github.com/Xilinx/qemu/blob/master/hw/dma/csu_stream_dma.c
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 or
10 * (at your option) version 3 of the License.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, see <http://www.gnu.org/licenses/>.
21 #include "qemu/osdep.h"
22 #include "qemu/log.h"
23 #include "qapi/error.h"
24 #include "hw/irq.h"
25 #include "hw/qdev-properties.h"
26 #include "hw/sysbus.h"
27 #include "migration/vmstate.h"
28 #include "sysemu/dma.h"
29 #include "hw/ptimer.h"
30 #include "hw/stream.h"
31 #include "hw/register.h"
32 #include "hw/dma/xlnx_csu_dma.h"
35 * Ref: UG1087 (v1.7) February 8, 2019
36 * https://www.xilinx.com/html_docs/registers/ug1087/ug1087-zynq-ultrascale-registers.html
37 * CSUDMA Module section
39 REG32(ADDR, 0x0)
40 FIELD(ADDR, ADDR, 2, 30) /* wo */
41 REG32(SIZE, 0x4)
42 FIELD(SIZE, SIZE, 2, 27) /* wo */
43 FIELD(SIZE, LAST_WORD, 0, 1) /* rw, only exists in SRC */
44 REG32(STATUS, 0x8)
45 FIELD(STATUS, DONE_CNT, 13, 3) /* wtc */
46 FIELD(STATUS, FIFO_LEVEL, 5, 8) /* ro */
47 FIELD(STATUS, OUTSTANDING, 1, 4) /* ro */
48 FIELD(STATUS, BUSY, 0, 1) /* ro */
49 REG32(CTRL, 0xc)
50 FIELD(CTRL, FIFOTHRESH, 25, 7) /* rw, only exists in DST, reset 0x40 */
51 FIELD(CTRL, APB_ERR_RESP, 24, 1) /* rw */
52 FIELD(CTRL, ENDIANNESS, 23, 1) /* rw */
53 FIELD(CTRL, AXI_BRST_TYPE, 22, 1) /* rw */
54 FIELD(CTRL, TIMEOUT_VAL, 10, 12) /* rw, reset: 0xFFE */
55 FIELD(CTRL, FIFO_THRESH, 2, 8) /* rw, reset: 0x80 */
56 FIELD(CTRL, PAUSE_STRM, 1, 1) /* rw */
57 FIELD(CTRL, PAUSE_MEM, 0, 1) /* rw */
58 REG32(CRC, 0x10)
59 REG32(INT_STATUS, 0x14)
60 FIELD(INT_STATUS, FIFO_OVERFLOW, 7, 1) /* wtc */
61 FIELD(INT_STATUS, INVALID_APB, 6, 1) /* wtc */
62 FIELD(INT_STATUS, THRESH_HIT, 5, 1) /* wtc */
63 FIELD(INT_STATUS, TIMEOUT_MEM, 4, 1) /* wtc */
64 FIELD(INT_STATUS, TIMEOUT_STRM, 3, 1) /* wtc */
65 FIELD(INT_STATUS, AXI_BRESP_ERR, 2, 1) /* wtc, SRC: AXI_RDERR */
66 FIELD(INT_STATUS, DONE, 1, 1) /* wtc */
67 FIELD(INT_STATUS, MEM_DONE, 0, 1) /* wtc */
68 REG32(INT_ENABLE, 0x18)
69 FIELD(INT_ENABLE, FIFO_OVERFLOW, 7, 1) /* wtc */
70 FIELD(INT_ENABLE, INVALID_APB, 6, 1) /* wtc */
71 FIELD(INT_ENABLE, THRESH_HIT, 5, 1) /* wtc */
72 FIELD(INT_ENABLE, TIMEOUT_MEM, 4, 1) /* wtc */
73 FIELD(INT_ENABLE, TIMEOUT_STRM, 3, 1) /* wtc */
74 FIELD(INT_ENABLE, AXI_BRESP_ERR, 2, 1) /* wtc, SRC: AXI_RDERR */
75 FIELD(INT_ENABLE, DONE, 1, 1) /* wtc */
76 FIELD(INT_ENABLE, MEM_DONE, 0, 1) /* wtc */
77 REG32(INT_DISABLE, 0x1c)
78 FIELD(INT_DISABLE, FIFO_OVERFLOW, 7, 1) /* wtc */
79 FIELD(INT_DISABLE, INVALID_APB, 6, 1) /* wtc */
80 FIELD(INT_DISABLE, THRESH_HIT, 5, 1) /* wtc */
81 FIELD(INT_DISABLE, TIMEOUT_MEM, 4, 1) /* wtc */
82 FIELD(INT_DISABLE, TIMEOUT_STRM, 3, 1) /* wtc */
83 FIELD(INT_DISABLE, AXI_BRESP_ERR, 2, 1) /* wtc, SRC: AXI_RDERR */
84 FIELD(INT_DISABLE, DONE, 1, 1) /* wtc */
85 FIELD(INT_DISABLE, MEM_DONE, 0, 1) /* wtc */
86 REG32(INT_MASK, 0x20)
87 FIELD(INT_MASK, FIFO_OVERFLOW, 7, 1) /* ro, reset: 0x1 */
88 FIELD(INT_MASK, INVALID_APB, 6, 1) /* ro, reset: 0x1 */
89 FIELD(INT_MASK, THRESH_HIT, 5, 1) /* ro, reset: 0x1 */
90 FIELD(INT_MASK, TIMEOUT_MEM, 4, 1) /* ro, reset: 0x1 */
91 FIELD(INT_MASK, TIMEOUT_STRM, 3, 1) /* ro, reset: 0x1 */
92 FIELD(INT_MASK, AXI_BRESP_ERR, 2, 1) /* ro, reset: 0x1, SRC: AXI_RDERR */
93 FIELD(INT_MASK, DONE, 1, 1) /* ro, reset: 0x1 */
94 FIELD(INT_MASK, MEM_DONE, 0, 1) /* ro, reset: 0x1 */
95 REG32(CTRL2, 0x24)
96 FIELD(CTRL2, ARCACHE, 24, 3) /* rw */
97 FIELD(CTRL2, ROUTE_BIT, 23, 1) /* rw */
98 FIELD(CTRL2, TIMEOUT_EN, 22, 1) /* rw */
99 FIELD(CTRL2, TIMEOUT_PRE, 4, 12) /* rw, reset: 0xFFF */
100 FIELD(CTRL2, MAX_OUTS_CMDS, 0, 4) /* rw, reset: 0x8 */
101 REG32(ADDR_MSB, 0x28)
102 FIELD(ADDR_MSB, ADDR_MSB, 0, 17) /* wo */
104 #define R_CTRL_TIMEOUT_VAL_RESET (0xFFE)
105 #define R_CTRL_FIFO_THRESH_RESET (0x80)
106 #define R_CTRL_FIFOTHRESH_RESET (0x40)
108 #define R_CTRL2_TIMEOUT_PRE_RESET (0xFFF)
109 #define R_CTRL2_MAX_OUTS_CMDS_RESET (0x8)
111 #define XLNX_CSU_DMA_ERR_DEBUG (0)
112 #define XLNX_CSU_DMA_INT_R_MASK (0xff)
114 /* UG1807: Set the prescaler value for the timeout in clk (~2.5ns) cycles */
115 #define XLNX_CSU_DMA_TIMER_FREQ (400 * 1000 * 1000)
117 static bool xlnx_csu_dma_is_paused(XlnxCSUDMA *s)
119 bool paused;
121 paused = !!(s->regs[R_CTRL] & R_CTRL_PAUSE_STRM_MASK);
122 paused |= !!(s->regs[R_CTRL] & R_CTRL_PAUSE_MEM_MASK);
124 return paused;
127 static bool xlnx_csu_dma_get_eop(XlnxCSUDMA *s)
129 return s->r_size_last_word;
132 static bool xlnx_csu_dma_burst_is_fixed(XlnxCSUDMA *s)
134 return !!(s->regs[R_CTRL] & R_CTRL_AXI_BRST_TYPE_MASK);
137 static bool xlnx_csu_dma_timeout_enabled(XlnxCSUDMA *s)
139 return !!(s->regs[R_CTRL2] & R_CTRL2_TIMEOUT_EN_MASK);
142 static void xlnx_csu_dma_update_done_cnt(XlnxCSUDMA *s, int a)
144 int cnt;
146 /* Increase DONE_CNT */
147 cnt = ARRAY_FIELD_EX32(s->regs, STATUS, DONE_CNT) + a;
148 ARRAY_FIELD_DP32(s->regs, STATUS, DONE_CNT, cnt);
151 static void xlnx_csu_dma_data_process(XlnxCSUDMA *s, uint8_t *buf, uint32_t len)
153 uint32_t bswap;
154 uint32_t i;
156 bswap = s->regs[R_CTRL] & R_CTRL_ENDIANNESS_MASK;
157 if (s->is_dst && !bswap) {
158 /* Fast when ENDIANNESS cleared */
159 return;
162 for (i = 0; i < len; i += 4) {
163 uint8_t *b = &buf[i];
164 union {
165 uint8_t u8[4];
166 uint32_t u32;
167 } v = {
168 .u8 = { b[0], b[1], b[2], b[3] }
171 if (!s->is_dst) {
172 s->regs[R_CRC] += v.u32;
174 if (bswap) {
176 * No point using bswap, we need to writeback
177 * into a potentially unaligned pointer.
179 b[0] = v.u8[3];
180 b[1] = v.u8[2];
181 b[2] = v.u8[1];
182 b[3] = v.u8[0];
187 static void xlnx_csu_dma_update_irq(XlnxCSUDMA *s)
189 qemu_set_irq(s->irq, !!(s->regs[R_INT_STATUS] & ~s->regs[R_INT_MASK]));
192 /* len is in bytes */
193 static uint32_t xlnx_csu_dma_read(XlnxCSUDMA *s, uint8_t *buf, uint32_t len)
195 hwaddr addr = (hwaddr)s->regs[R_ADDR_MSB] << 32 | s->regs[R_ADDR];
196 MemTxResult result = MEMTX_OK;
198 if (xlnx_csu_dma_burst_is_fixed(s)) {
199 uint32_t i;
201 for (i = 0; i < len && (result == MEMTX_OK); i += s->width) {
202 uint32_t mlen = MIN(len - i, s->width);
204 result = address_space_rw(&s->dma_as, addr, s->attr,
205 buf + i, mlen, false);
207 } else {
208 result = address_space_rw(&s->dma_as, addr, s->attr, buf, len, false);
211 if (result == MEMTX_OK) {
212 xlnx_csu_dma_data_process(s, buf, len);
213 } else {
214 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad address " TARGET_FMT_plx
215 " for mem read", __func__, addr);
216 s->regs[R_INT_STATUS] |= R_INT_STATUS_AXI_BRESP_ERR_MASK;
217 xlnx_csu_dma_update_irq(s);
219 return len;
222 /* len is in bytes */
223 static uint32_t xlnx_csu_dma_write(XlnxCSUDMA *s, uint8_t *buf, uint32_t len)
225 hwaddr addr = (hwaddr)s->regs[R_ADDR_MSB] << 32 | s->regs[R_ADDR];
226 MemTxResult result = MEMTX_OK;
228 xlnx_csu_dma_data_process(s, buf, len);
229 if (xlnx_csu_dma_burst_is_fixed(s)) {
230 uint32_t i;
232 for (i = 0; i < len && (result == MEMTX_OK); i += s->width) {
233 uint32_t mlen = MIN(len - i, s->width);
235 result = address_space_rw(&s->dma_as, addr, s->attr,
236 buf, mlen, true);
237 buf += mlen;
239 } else {
240 result = address_space_rw(&s->dma_as, addr, s->attr, buf, len, true);
243 if (result != MEMTX_OK) {
244 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad address " TARGET_FMT_plx
245 " for mem write", __func__, addr);
246 s->regs[R_INT_STATUS] |= R_INT_STATUS_AXI_BRESP_ERR_MASK;
247 xlnx_csu_dma_update_irq(s);
249 return len;
252 static void xlnx_csu_dma_done(XlnxCSUDMA *s)
254 s->regs[R_STATUS] &= ~R_STATUS_BUSY_MASK;
255 s->regs[R_INT_STATUS] |= R_INT_STATUS_DONE_MASK;
257 if (!s->is_dst) {
258 s->regs[R_INT_STATUS] |= R_INT_STATUS_MEM_DONE_MASK;
261 xlnx_csu_dma_update_done_cnt(s, 1);
264 static uint32_t xlnx_csu_dma_advance(XlnxCSUDMA *s, uint32_t len)
266 uint32_t size = s->regs[R_SIZE];
267 hwaddr dst = (hwaddr)s->regs[R_ADDR_MSB] << 32 | s->regs[R_ADDR];
269 assert(len <= size);
271 size -= len;
272 s->regs[R_SIZE] = size;
274 if (!xlnx_csu_dma_burst_is_fixed(s)) {
275 dst += len;
276 s->regs[R_ADDR] = (uint32_t) dst;
277 s->regs[R_ADDR_MSB] = dst >> 32;
280 if (size == 0) {
281 xlnx_csu_dma_done(s);
284 return size;
287 static void xlnx_csu_dma_src_notify(void *opaque)
289 XlnxCSUDMA *s = XLNX_CSU_DMA(opaque);
290 unsigned char buf[4 * 1024];
291 size_t rlen = 0;
293 ptimer_transaction_begin(s->src_timer);
294 /* Stop the backpreassure timer */
295 ptimer_stop(s->src_timer);
297 while (s->regs[R_SIZE] && !xlnx_csu_dma_is_paused(s) &&
298 stream_can_push(s->tx_dev, xlnx_csu_dma_src_notify, s)) {
299 uint32_t plen = MIN(s->regs[R_SIZE], sizeof buf);
300 bool eop = false;
302 /* Did we fit it all? */
303 if (s->regs[R_SIZE] == plen && xlnx_csu_dma_get_eop(s)) {
304 eop = true;
307 /* DMA transfer */
308 xlnx_csu_dma_read(s, buf, plen);
309 rlen = stream_push(s->tx_dev, buf, plen, eop);
310 xlnx_csu_dma_advance(s, rlen);
313 if (xlnx_csu_dma_timeout_enabled(s) && s->regs[R_SIZE] &&
314 !stream_can_push(s->tx_dev, xlnx_csu_dma_src_notify, s)) {
315 uint32_t timeout = ARRAY_FIELD_EX32(s->regs, CTRL, TIMEOUT_VAL);
316 uint32_t div = ARRAY_FIELD_EX32(s->regs, CTRL2, TIMEOUT_PRE) + 1;
317 uint32_t freq = XLNX_CSU_DMA_TIMER_FREQ;
319 freq /= div;
320 ptimer_set_freq(s->src_timer, freq);
321 ptimer_set_count(s->src_timer, timeout);
322 ptimer_run(s->src_timer, 1);
325 ptimer_transaction_commit(s->src_timer);
326 xlnx_csu_dma_update_irq(s);
329 static uint64_t addr_pre_write(RegisterInfo *reg, uint64_t val)
331 /* Address is word aligned */
332 return val & R_ADDR_ADDR_MASK;
335 static uint64_t size_pre_write(RegisterInfo *reg, uint64_t val)
337 XlnxCSUDMA *s = XLNX_CSU_DMA(reg->opaque);
339 if (s->regs[R_SIZE] != 0) {
340 qemu_log_mask(LOG_GUEST_ERROR,
341 "%s: Starting DMA while already running.\n", __func__);
344 if (!s->is_dst) {
345 s->r_size_last_word = !!(val & R_SIZE_LAST_WORD_MASK);
348 /* Size is word aligned */
349 return val & R_SIZE_SIZE_MASK;
352 static uint64_t size_post_read(RegisterInfo *reg, uint64_t val)
354 XlnxCSUDMA *s = XLNX_CSU_DMA(reg->opaque);
356 return val | s->r_size_last_word;
359 static void size_post_write(RegisterInfo *reg, uint64_t val)
361 XlnxCSUDMA *s = XLNX_CSU_DMA(reg->opaque);
363 s->regs[R_STATUS] |= R_STATUS_BUSY_MASK;
366 * Note that if SIZE is programmed to 0, and the DMA is started,
367 * the interrupts DONE and MEM_DONE will be asserted.
369 if (s->regs[R_SIZE] == 0) {
370 xlnx_csu_dma_done(s);
371 xlnx_csu_dma_update_irq(s);
372 return;
375 /* Set SIZE is considered the last step in transfer configuration */
376 if (!s->is_dst) {
377 xlnx_csu_dma_src_notify(s);
378 } else {
379 if (s->notify) {
380 s->notify(s->notify_opaque);
385 static uint64_t status_pre_write(RegisterInfo *reg, uint64_t val)
387 return val & (R_STATUS_DONE_CNT_MASK | R_STATUS_BUSY_MASK);
390 static void ctrl_post_write(RegisterInfo *reg, uint64_t val)
392 XlnxCSUDMA *s = XLNX_CSU_DMA(reg->opaque);
394 if (!s->is_dst) {
395 if (!xlnx_csu_dma_is_paused(s)) {
396 xlnx_csu_dma_src_notify(s);
398 } else {
399 if (!xlnx_csu_dma_is_paused(s) && s->notify) {
400 s->notify(s->notify_opaque);
405 static uint64_t int_status_pre_write(RegisterInfo *reg, uint64_t val)
407 XlnxCSUDMA *s = XLNX_CSU_DMA(reg->opaque);
409 /* DMA counter decrements when flag 'DONE' is cleared */
410 if ((val & s->regs[R_INT_STATUS] & R_INT_STATUS_DONE_MASK)) {
411 xlnx_csu_dma_update_done_cnt(s, -1);
414 return s->regs[R_INT_STATUS] & ~val;
417 static void int_status_post_write(RegisterInfo *reg, uint64_t val)
419 XlnxCSUDMA *s = XLNX_CSU_DMA(reg->opaque);
421 xlnx_csu_dma_update_irq(s);
424 static uint64_t int_enable_pre_write(RegisterInfo *reg, uint64_t val)
426 XlnxCSUDMA *s = XLNX_CSU_DMA(reg->opaque);
427 uint32_t v32 = val;
430 * R_INT_ENABLE doesn't have its own state.
431 * It is used to indirectly modify R_INT_MASK.
433 * 1: Enable this interrupt field (the mask bit will be cleared to 0)
434 * 0: No effect
436 s->regs[R_INT_MASK] &= ~v32;
437 return 0;
440 static void int_enable_post_write(RegisterInfo *reg, uint64_t val)
442 XlnxCSUDMA *s = XLNX_CSU_DMA(reg->opaque);
444 xlnx_csu_dma_update_irq(s);
447 static uint64_t int_disable_pre_write(RegisterInfo *reg, uint64_t val)
449 XlnxCSUDMA *s = XLNX_CSU_DMA(reg->opaque);
450 uint32_t v32 = val;
453 * R_INT_DISABLE doesn't have its own state.
454 * It is used to indirectly modify R_INT_MASK.
456 * 1: Disable this interrupt field (the mask bit will be set to 1)
457 * 0: No effect
459 s->regs[R_INT_MASK] |= v32;
460 return 0;
463 static void int_disable_post_write(RegisterInfo *reg, uint64_t val)
465 XlnxCSUDMA *s = XLNX_CSU_DMA(reg->opaque);
467 xlnx_csu_dma_update_irq(s);
470 static uint64_t addr_msb_pre_write(RegisterInfo *reg, uint64_t val)
472 return val & R_ADDR_MSB_ADDR_MSB_MASK;
475 static const RegisterAccessInfo *xlnx_csu_dma_regs_info[] = {
476 #define DMACH_REGINFO(NAME, snd) \
477 (const RegisterAccessInfo []) { \
479 .name = #NAME "_ADDR", \
480 .addr = A_ADDR, \
481 .pre_write = addr_pre_write \
482 }, { \
483 .name = #NAME "_SIZE", \
484 .addr = A_SIZE, \
485 .pre_write = size_pre_write, \
486 .post_write = size_post_write, \
487 .post_read = size_post_read \
488 }, { \
489 .name = #NAME "_STATUS", \
490 .addr = A_STATUS, \
491 .pre_write = status_pre_write, \
492 .w1c = R_STATUS_DONE_CNT_MASK, \
493 .ro = (R_STATUS_BUSY_MASK \
494 | R_STATUS_FIFO_LEVEL_MASK \
495 | R_STATUS_OUTSTANDING_MASK) \
496 }, { \
497 .name = #NAME "_CTRL", \
498 .addr = A_CTRL, \
499 .post_write = ctrl_post_write, \
500 .reset = ((R_CTRL_TIMEOUT_VAL_RESET << R_CTRL_TIMEOUT_VAL_SHIFT) \
501 | (R_CTRL_FIFO_THRESH_RESET << R_CTRL_FIFO_THRESH_SHIFT)\
502 | (snd ? 0 : R_CTRL_FIFOTHRESH_RESET \
503 << R_CTRL_FIFOTHRESH_SHIFT)) \
504 }, { \
505 .name = #NAME "_CRC", \
506 .addr = A_CRC, \
507 }, { \
508 .name = #NAME "_INT_STATUS", \
509 .addr = A_INT_STATUS, \
510 .pre_write = int_status_pre_write, \
511 .post_write = int_status_post_write \
512 }, { \
513 .name = #NAME "_INT_ENABLE", \
514 .addr = A_INT_ENABLE, \
515 .pre_write = int_enable_pre_write, \
516 .post_write = int_enable_post_write \
517 }, { \
518 .name = #NAME "_INT_DISABLE", \
519 .addr = A_INT_DISABLE, \
520 .pre_write = int_disable_pre_write, \
521 .post_write = int_disable_post_write \
522 }, { \
523 .name = #NAME "_INT_MASK", \
524 .addr = A_INT_MASK, \
525 .ro = ~0, \
526 .reset = XLNX_CSU_DMA_INT_R_MASK \
527 }, { \
528 .name = #NAME "_CTRL2", \
529 .addr = A_CTRL2, \
530 .reset = ((R_CTRL2_TIMEOUT_PRE_RESET \
531 << R_CTRL2_TIMEOUT_PRE_SHIFT) \
532 | (R_CTRL2_MAX_OUTS_CMDS_RESET \
533 << R_CTRL2_MAX_OUTS_CMDS_SHIFT)) \
534 }, { \
535 .name = #NAME "_ADDR_MSB", \
536 .addr = A_ADDR_MSB, \
537 .pre_write = addr_msb_pre_write \
541 DMACH_REGINFO(DMA_SRC, true),
542 DMACH_REGINFO(DMA_DST, false)
545 static const MemoryRegionOps xlnx_csu_dma_ops = {
546 .read = register_read_memory,
547 .write = register_write_memory,
548 .endianness = DEVICE_LITTLE_ENDIAN,
549 .valid = {
550 .min_access_size = 4,
551 .max_access_size = 4,
555 static void xlnx_csu_dma_src_timeout_hit(void *opaque)
557 XlnxCSUDMA *s = XLNX_CSU_DMA(opaque);
559 /* Ignore if the timeout is masked */
560 if (!xlnx_csu_dma_timeout_enabled(s)) {
561 return;
564 s->regs[R_INT_STATUS] |= R_INT_STATUS_TIMEOUT_STRM_MASK;
565 xlnx_csu_dma_update_irq(s);
568 static size_t xlnx_csu_dma_stream_push(StreamSink *obj, uint8_t *buf,
569 size_t len, bool eop)
571 XlnxCSUDMA *s = XLNX_CSU_DMA(obj);
572 uint32_t size = s->regs[R_SIZE];
573 uint32_t mlen = MIN(size, len) & (~3); /* Size is word aligned */
575 /* Be called when it's DST */
576 assert(s->is_dst);
578 if (size == 0 || len <= 0) {
579 return 0;
582 if (len && (xlnx_csu_dma_is_paused(s) || mlen == 0)) {
583 qemu_log_mask(LOG_GUEST_ERROR,
584 "csu-dma: DST channel dropping %zd b of data.\n", len);
585 s->regs[R_INT_STATUS] |= R_INT_STATUS_FIFO_OVERFLOW_MASK;
586 return len;
589 if (xlnx_csu_dma_write(s, buf, mlen) != mlen) {
590 return 0;
593 xlnx_csu_dma_advance(s, mlen);
594 xlnx_csu_dma_update_irq(s);
596 return mlen;
599 static bool xlnx_csu_dma_stream_can_push(StreamSink *obj,
600 StreamCanPushNotifyFn notify,
601 void *notify_opaque)
603 XlnxCSUDMA *s = XLNX_CSU_DMA(obj);
605 if (s->regs[R_SIZE] != 0) {
606 return true;
607 } else {
608 s->notify = notify;
609 s->notify_opaque = notify_opaque;
610 return false;
614 static void xlnx_csu_dma_reset(DeviceState *dev)
616 XlnxCSUDMA *s = XLNX_CSU_DMA(dev);
617 unsigned int i;
619 for (i = 0; i < ARRAY_SIZE(s->regs_info); ++i) {
620 register_reset(&s->regs_info[i]);
624 static void xlnx_csu_dma_realize(DeviceState *dev, Error **errp)
626 XlnxCSUDMA *s = XLNX_CSU_DMA(dev);
627 RegisterInfoArray *reg_array;
629 if (!s->is_dst && !s->tx_dev) {
630 error_setg(errp, "zynqmp.csu-dma: Stream not connected");
631 return;
634 if (!s->dma_mr) {
635 error_setg(errp, TYPE_XLNX_CSU_DMA " 'dma' link not set");
636 return;
638 address_space_init(&s->dma_as, s->dma_mr, "csu-dma");
640 reg_array =
641 register_init_block32(dev, xlnx_csu_dma_regs_info[!!s->is_dst],
642 XLNX_CSU_DMA_R_MAX,
643 s->regs_info, s->regs,
644 &xlnx_csu_dma_ops,
645 XLNX_CSU_DMA_ERR_DEBUG,
646 XLNX_CSU_DMA_R_MAX * 4);
647 memory_region_add_subregion(&s->iomem,
648 0x0,
649 &reg_array->mem);
651 sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem);
652 sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->irq);
654 s->src_timer = ptimer_init(xlnx_csu_dma_src_timeout_hit,
655 s, PTIMER_POLICY_DEFAULT);
657 s->attr = MEMTXATTRS_UNSPECIFIED;
659 s->r_size_last_word = 0;
662 static const VMStateDescription vmstate_xlnx_csu_dma = {
663 .name = TYPE_XLNX_CSU_DMA,
664 .version_id = 0,
665 .minimum_version_id = 0,
666 .minimum_version_id_old = 0,
667 .fields = (VMStateField[]) {
668 VMSTATE_PTIMER(src_timer, XlnxCSUDMA),
669 VMSTATE_UINT16(width, XlnxCSUDMA),
670 VMSTATE_BOOL(is_dst, XlnxCSUDMA),
671 VMSTATE_BOOL(r_size_last_word, XlnxCSUDMA),
672 VMSTATE_UINT32_ARRAY(regs, XlnxCSUDMA, XLNX_CSU_DMA_R_MAX),
673 VMSTATE_END_OF_LIST(),
677 static Property xlnx_csu_dma_properties[] = {
679 * Ref PG021, Stream Data Width:
680 * Data width in bits of the AXI S2MM AXI4-Stream Data bus.
681 * This value must be equal or less than the Memory Map Data Width.
682 * Valid values are 8, 16, 32, 64, 128, 512 and 1024.
683 * "dma-width" is the byte value of the "Stream Data Width".
685 DEFINE_PROP_UINT16("dma-width", XlnxCSUDMA, width, 4),
687 * The CSU DMA is a two-channel, simple DMA, allowing separate control of
688 * the SRC (read) channel and DST (write) channel. "is-dst" is used to mark
689 * which channel the device is connected to.
691 DEFINE_PROP_BOOL("is-dst", XlnxCSUDMA, is_dst, true),
692 DEFINE_PROP_END_OF_LIST(),
695 static void xlnx_csu_dma_class_init(ObjectClass *klass, void *data)
697 DeviceClass *dc = DEVICE_CLASS(klass);
698 StreamSinkClass *ssc = STREAM_SINK_CLASS(klass);
700 dc->reset = xlnx_csu_dma_reset;
701 dc->realize = xlnx_csu_dma_realize;
702 dc->vmsd = &vmstate_xlnx_csu_dma;
703 device_class_set_props(dc, xlnx_csu_dma_properties);
705 ssc->push = xlnx_csu_dma_stream_push;
706 ssc->can_push = xlnx_csu_dma_stream_can_push;
709 static void xlnx_csu_dma_init(Object *obj)
711 XlnxCSUDMA *s = XLNX_CSU_DMA(obj);
713 memory_region_init(&s->iomem, obj, TYPE_XLNX_CSU_DMA,
714 XLNX_CSU_DMA_R_MAX * 4);
716 object_property_add_link(obj, "stream-connected-dma", TYPE_STREAM_SINK,
717 (Object **)&s->tx_dev,
718 qdev_prop_allow_set_link_before_realize,
719 OBJ_PROP_LINK_STRONG);
720 object_property_add_link(obj, "dma", TYPE_MEMORY_REGION,
721 (Object **)&s->dma_mr,
722 qdev_prop_allow_set_link_before_realize,
723 OBJ_PROP_LINK_STRONG);
726 static const TypeInfo xlnx_csu_dma_info = {
727 .name = TYPE_XLNX_CSU_DMA,
728 .parent = TYPE_SYS_BUS_DEVICE,
729 .instance_size = sizeof(XlnxCSUDMA),
730 .class_init = xlnx_csu_dma_class_init,
731 .instance_init = xlnx_csu_dma_init,
732 .interfaces = (InterfaceInfo[]) {
733 { TYPE_STREAM_SINK },
738 static void xlnx_csu_dma_register_types(void)
740 type_register_static(&xlnx_csu_dma_info);
743 type_init(xlnx_csu_dma_register_types)