162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 262306a36Sopenharmony_ci/* 362306a36Sopenharmony_ci * Copyright IBM Corp. 2017 462306a36Sopenharmony_ci */ 562306a36Sopenharmony_ci 662306a36Sopenharmony_ci#include <linux/console.h> 762306a36Sopenharmony_ci#include <linux/kernel.h> 862306a36Sopenharmony_ci#include <linux/init.h> 962306a36Sopenharmony_ci#include <asm/sclp.h> 1062306a36Sopenharmony_ci 1162306a36Sopenharmony_cistatic void sclp_early_write(struct console *con, const char *s, unsigned int len) 1262306a36Sopenharmony_ci{ 1362306a36Sopenharmony_ci __sclp_early_printk(s, len); 1462306a36Sopenharmony_ci} 1562306a36Sopenharmony_ci 1662306a36Sopenharmony_cistatic struct console sclp_early_console = { 1762306a36Sopenharmony_ci .name = "earlysclp", 1862306a36Sopenharmony_ci .write = sclp_early_write, 1962306a36Sopenharmony_ci .flags = CON_PRINTBUFFER | CON_BOOT, 2062306a36Sopenharmony_ci .index = -1, 2162306a36Sopenharmony_ci}; 2262306a36Sopenharmony_ci 2362306a36Sopenharmony_cistatic int __init setup_early_printk(char *buf) 2462306a36Sopenharmony_ci{ 2562306a36Sopenharmony_ci if (early_console) 2662306a36Sopenharmony_ci return 0; 2762306a36Sopenharmony_ci /* Accept only "earlyprintk" and "earlyprintk=sclp" */ 2862306a36Sopenharmony_ci if (buf && !str_has_prefix(buf, "sclp")) 2962306a36Sopenharmony_ci return 0; 3062306a36Sopenharmony_ci if (!sclp.has_linemode && !sclp.has_vt220) 3162306a36Sopenharmony_ci return 0; 3262306a36Sopenharmony_ci early_console = &sclp_early_console; 3362306a36Sopenharmony_ci register_console(early_console); 3462306a36Sopenharmony_ci return 0; 3562306a36Sopenharmony_ci} 3662306a36Sopenharmony_ciearly_param("earlyprintk", setup_early_printk); 37