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Vadim Bendeburyb012bc92012-10-12 18:48:48 +00001/*
2 * Copyright (C) 2011 The ChromiumOS Authors. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
16 */
17
18#include <common.h>
Simon Glass24b852a2015-11-08 23:47:45 -070019#include <console.h>
Vadim Bendeburyb012bc92012-10-12 18:48:48 +000020#ifndef CONFIG_SYS_COREBOOT
21#error This driver requires coreboot
22#endif
23
24#include <asm/arch/sysinfo.h>
25
26struct cbmem_console {
27 u32 buffer_size;
28 u32 buffer_cursor;
29 u8 buffer_body[0];
30} __attribute__ ((__packed__));
31
32static struct cbmem_console *cbmem_console_p;
33
Simon Glass709ea542014-07-23 06:54:59 -060034void cbmemc_putc(struct stdio_dev *dev, char data)
Vadim Bendeburyb012bc92012-10-12 18:48:48 +000035{
36 int cursor;
37
38 cursor = cbmem_console_p->buffer_cursor++;
39 if (cursor < cbmem_console_p->buffer_size)
40 cbmem_console_p->buffer_body[cursor] = data;
41}
42
Simon Glass709ea542014-07-23 06:54:59 -060043void cbmemc_puts(struct stdio_dev *dev, const char *str)
Vadim Bendeburyb012bc92012-10-12 18:48:48 +000044{
45 char c;
46
47 while ((c = *str++) != 0)
Simon Glass709ea542014-07-23 06:54:59 -060048 cbmemc_putc(dev, c);
Vadim Bendeburyb012bc92012-10-12 18:48:48 +000049}
50
51int cbmemc_init(void)
52{
53 int rc;
54 struct stdio_dev cons_dev;
55 cbmem_console_p = lib_sysinfo.cbmem_cons;
56
57 memset(&cons_dev, 0, sizeof(cons_dev));
58
59 strcpy(cons_dev.name, "cbmem");
60 cons_dev.flags = DEV_FLAGS_OUTPUT; /* Output only */
61 cons_dev.putc = cbmemc_putc;
62 cons_dev.puts = cbmemc_puts;
63
64 rc = stdio_register(&cons_dev);
65
66 return (rc == 0) ? 1 : rc;
67}