1 #include <u.h>
2 #include "dat.h"
3 #include "fns.h"
4
5 enum {
6 QSPI_CFG,
7 QSPI_STATUS,
8 QSPI_EN = 5,
9 QSPI_TXD4 = 7,
10 QSPI_RXD,
11 QSPI_TXD1 = 32,
12 QSPI_TXD2,
13 QSPI_TXD3
14 };
15
16 #define QSPI0 ((void *) 0xE000D000)
17
18 static u32int
cmd(ulong * r,int sz,u32int c)19 cmd(ulong *r, int sz, u32int c)
20 {
21 if(sz == 4)
22 r[QSPI_TXD4] = c;
23 else
24 r[QSPI_TXD1 + sz - 1] = c;
25 r[QSPI_CFG] |= 1<<16;
26 while((r[QSPI_STATUS] & (1<<2|1<<4)) != (1<<2|1<<4))
27 ;
28 return r[QSPI_RXD];
29 }
30
31 void
flash(void)32 flash(void)
33 {
34 ulong *r;
35
36 r = QSPI0;
37 r[QSPI_CFG] = 1<<31 | 1<<19 | 3<<6 | 1<<15 | 1<<14 | 1<<10 | 1<<3 | 1;
38 r[QSPI_CFG] &= ~(1<<10);
39 r[QSPI_EN] = 1;
40 cmd(r, 1, 0x06);
41 // cmd(r, 3, 0xD8);
42 for(;;)
43 print("%x\n", cmd(r, 2, 0x05));
44
45 }
46