arch/mips/ath79/prom.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Atheros AR71XX/AR724X/AR913X specific prom routines
   4  *
   5  *  Copyright (C) 2015 Laurent Fasnacht <l@libres.ch>
   6  *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
   7  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/io.h>
  13 #include <linux/string.h>
  14 #include <linux/initrd.h>
  15
  16 #include <asm/bootinfo.h>
  17 #include <asm/addrspace.h>
  18 #include <asm/fw/fw.h>
  19
  20 #include "common.h"
  21
  22 void __init prom_init(void)
  23 {
  24         fw_init_cmdline();
  25
  26 #ifdef CONFIG_BLK_DEV_INITRD
  27         /* Read the initrd address from the firmware environment */
  28         initrd_start = fw_getenvl("initrd_start");
  29         if (initrd_start) {
  30                 initrd_start = KSEG0ADDR(initrd_start);
  31                 initrd_end = initrd_start + fw_getenvl("initrd_size");
  32         }
  33 #endif
  34 }