1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright IBM Corp. 2017
4 */
5
6 #include <linux/console.h>
7 #include <linux/kernel.h>
8 #include <linux/init.h>
9 #include <asm/sclp.h>
10
11 static void sclp_early_write(struct console *con, const char *s, unsigned int len)
12 {
13 __sclp_early_printk(s, len);
14 }
15
16 static struct console sclp_early_console = {
17 .name = "earlysclp",
18 .write = sclp_early_write,
19 .flags = CON_PRINTBUFFER | CON_BOOT,
20 .index = -1,
21 };
22
23 static int __init setup_early_printk(char *buf)
24 {
25 if (early_console)
26 return 0;
27 /* Accept only "earlyprintk" and "earlyprintk=sclp" */
28 if (buf && !str_has_prefix(buf, "sclp"))
29 return 0;
30 if (!sclp.has_linemode && !sclp.has_vt220)
31 return 0;
32 early_console = &sclp_early_console;
33 register_console(early_console);
34 return 0;
35 }
36 early_param("earlyprintk", setup_early_printk);
37
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