Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * Copyright (c) 2016 IBM Corporation.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 */
9
10#include "ops.h"
11#include "stdio.h"
12#include "io.h"
13#include <libfdt.h>
14#include "../include/asm/opal-api.h"
15
16#ifdef __powerpc64__
17
18/* Global OPAL struct used by opal-call.S */
19struct opal {
20 u64 base;
21 u64 entry;
22} opal;
23
24static u32 opal_con_id;
25
26int64_t opal_console_write(int64_t term_number, u64 *length, const u8 *buffer);
27int64_t opal_console_read(int64_t term_number, uint64_t *length, u8 *buffer);
28int64_t opal_console_write_buffer_space(uint64_t term_number, uint64_t *length);
29int64_t opal_console_flush(uint64_t term_number);
30int64_t opal_poll_events(uint64_t *outstanding_event_mask);
31
32static int opal_con_open(void)
33{
34 return 0;
35}
36
37static void opal_con_putc(unsigned char c)
38{
39 int64_t rc;
40 uint64_t olen, len;
41
42 do {
43 rc = opal_console_write_buffer_space(opal_con_id, &olen);
44 len = be64_to_cpu(olen);
45 if (rc)
46 return;
47 opal_poll_events(NULL);
48 } while (len < 1);
49
50
51 olen = cpu_to_be64(1);
52 opal_console_write(opal_con_id, &olen, &c);
53}
54
55static void opal_con_close(void)
56{
57 opal_console_flush(opal_con_id);
58}
59
60static void opal_init(void)
61{
62 void *opal_node;
63
64 opal_node = finddevice("/ibm,opal");
65 if (!opal_node)
66 return;
67 if (getprop(opal_node, "opal-base-address", &opal.base, sizeof(u64)) < 0)
68 return;
69 opal.base = be64_to_cpu(opal.base);
70 if (getprop(opal_node, "opal-entry-address", &opal.entry, sizeof(u64)) < 0)
71 return;
72 opal.entry = be64_to_cpu(opal.entry);
73}
74
75int opal_console_init(void *devp, struct serial_console_data *scdp)
76{
77 opal_init();
78
79 if (devp) {
80 int n = getprop(devp, "reg", &opal_con_id, sizeof(u32));
81 if (n != sizeof(u32))
82 return -1;
83 opal_con_id = be32_to_cpu(opal_con_id);
84 } else
85 opal_con_id = 0;
86
87 scdp->open = opal_con_open;
88 scdp->putc = opal_con_putc;
89 scdp->close = opal_con_close;
90
91 return 0;
92}
93#else
94int opal_console_init(void *devp, struct serial_console_data *scdp)
95{
96 return -1;
97}
98#endif /* __powerpc64__ */