arch/mips/mti-sead3/sead3-init.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2012 MIPS Technologies, Inc.  All rights reserved.
   7  */
   8 #include <linux/init.h>
   9 #include <linux/io.h>
  10
  11 #include <asm/bootinfo.h>
  12 #include <asm/cacheflush.h>
  13 #include <asm/traps.h>
  14 #include <asm/mips-boards/generic.h>
  15 #include <asm/mips-boards/prom.h>
  16
  17 extern void prom_init_early_console(char port);
  18
  19 extern char except_vec_nmi;
  20 extern char except_vec_ejtag_debug;
  21
  22 int prom_argc;
  23 int *_prom_argv, *_prom_envp;
  24
  25 #define prom_envp(index) ((char *)(long)_prom_envp[(index)])
  26
  27 char *prom_getenv(char *envname)
  28 {
  29         /*
  30          * Return a pointer to the given environment variable.
  31          * In 64-bit mode: we're using 64-bit pointers, but all pointers
  32          * in the PROM structures are only 32-bit, so we need some
  33          * workarounds, if we are running in 64-bit mode.
  34          */
  35         int i, index = 0;
  36
  37         i = strlen(envname);
  38
  39         while (prom_envp(index)) {
  40                 if (strncmp(envname, prom_envp(index), i) == 0)
  41                         return prom_envp(index+1);
  42                 index += 2;
  43         }
  44
  45         return NULL;
  46 }
  47
  48 static void __init mips_nmi_setup(void)
  49 {
  50         void *base;
  51
  52         base = cpu_has_veic ?
  53                 (void *)(CAC_BASE + 0xa80) :
  54                 (void *)(CAC_BASE + 0x380);
  55         memcpy(base, &except_vec_nmi, 0x80);
  56         flush_icache_range((unsigned long)base, (unsigned long)base + 0x80);
  57 }
  58
  59 static void __init mips_ejtag_setup(void)
  60 {
  61         void *base;
  62
  63         base = cpu_has_veic ?
  64                 (void *)(CAC_BASE + 0xa00) :
  65                 (void *)(CAC_BASE + 0x300);
  66         memcpy(base, &except_vec_ejtag_debug, 0x80);
  67         flush_icache_range((unsigned long)base, (unsigned long)base + 0x80);
  68 }
  69
  70 void __init prom_init(void)
  71 {
  72         prom_argc = fw_arg0;
  73         _prom_argv = (int *) fw_arg1;
  74         _prom_envp = (int *) fw_arg2;
  75
  76         board_nmi_handler_setup = mips_nmi_setup;
  77         board_ejtag_handler_setup = mips_ejtag_setup;
  78
  79         prom_init_cmdline();
  80         prom_meminit();
  81 #ifdef CONFIG_EARLY_PRINTK
  82         if ((strstr(prom_getcmdline(), "console=ttyS0")) != NULL)
  83                 prom_init_early_console(0);
  84         else if ((strstr(prom_getcmdline(), "console=ttyS1")) != NULL)
  85                 prom_init_early_console(1);
  86 #endif
  87 #ifdef CONFIG_SERIAL_8250_CONSOLE
  88         if ((strstr(prom_getcmdline(), "console=")) == NULL)
  89                 strcat(prom_getcmdline(), " console=ttyS0,38400n8r");
  90 #endif
  91 }