1 /*
2 * Copyright (c) 2008-2012 Travis Geiselbrecht
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files
6 * (the "Software"), to deal in the Software without restriction,
7 * including without limitation the rights to use, copy, modify, merge,
8 * publish, distribute, sublicense, and/or sell copies of the Software,
9 * and to permit persons to whom the Software is furnished to do so,
10 * subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 */
23 #include <kernel/thread.h>
24 #include <platform/debug.h>
25 #include <platform/vexpress-a15.h>
26 #include <reg.h>
27 #include <stdarg.h>
28 #include <stdio.h>
29
30 #define DR (0x00)
31 #define FR (0x18)
32
33 #define UARTREG(reg) (*REG32(UART0 + (reg)))
34
platform_dputc(char c)35 void platform_dputc(char c) {
36 UARTREG(DR) = c;
37 }
38
platform_dgetc(char * c,bool wait)39 int platform_dgetc(char* c, bool wait) {
40 if (!wait) {
41 if (UARTREG(FR) & (1 << 4)) {
42 /* fifo empty */
43 return -1;
44 }
45 *c = UARTREG(DR) & 0xff;
46 return 0;
47 } else {
48 while ((UARTREG(FR) & (1 << 4))) {
49 // XXX actually block on interrupt
50 thread_yield();
51 }
52
53 *c = UARTREG(DR) & 0xff;
54 return 0;
55 }
56 }
57
58 #ifndef WITH_LIB_SM
platform_halt(void)59 void platform_halt(void) {
60 arch_disable_ints();
61 for (;;)
62 ;
63 }
64 #endif
65