1 #include "soc/lldesc.h"
2
lldesc_setup_link_constrained(lldesc_t * dmadesc,const void * data,int len,int max_desc_size,bool isrx)3 void lldesc_setup_link_constrained(lldesc_t *dmadesc, const void *data, int len, int max_desc_size, bool isrx)
4 {
5 int n = 0;
6 uint8_t *buf = (uint8_t *)data;
7 while (len) {
8 int dmachunklen = len;
9 if (dmachunklen > max_desc_size) {
10 dmachunklen = max_desc_size;
11 }
12 if (isrx) {
13 //Receive needs DMA length rounded to next 32-bit boundary
14 dmadesc[n].size = (dmachunklen + 3) & (~3);
15 dmadesc[n].length = (dmachunklen + 3) & (~3);
16 } else {
17 dmadesc[n].size = dmachunklen;
18 dmadesc[n].length = dmachunklen;
19 }
20 dmadesc[n].buf = buf;
21 dmadesc[n].eof = 0;
22 dmadesc[n].sosf = 0;
23 dmadesc[n].owner = 1;
24 dmadesc[n].qe.stqe_next = &dmadesc[n + 1];
25 len -= dmachunklen;
26 buf += dmachunklen;
27 n++;
28 }
29 dmadesc[n - 1].eof = 1; //Mark last DMA desc as end of stream.
30 dmadesc[n - 1].qe.stqe_next = NULL;
31 }
32
lldesc_get_received_len(lldesc_t * head,lldesc_t ** out_next)33 int lldesc_get_received_len(lldesc_t* head, lldesc_t** out_next)
34 {
35 lldesc_t* desc = head;
36 int len = 0;
37 while(desc) {
38 len += desc->length;
39 bool eof = desc->eof;
40 desc = STAILQ_NEXT(desc, qe);
41 if (eof) break;
42 }
43 if (out_next) {
44 *out_next = desc;
45 }
46 return len;
47 }
48
