arch/sparc/prom/console_32.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * console.c: Routines that deal with sending and receiving IO
   4  *            to/from the current console device using the PROM.
   5  *
   6  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   7  * Copyright (C) 1998 Pete Zaitcev <zaitcev@yahoo.com>
   8  */
   9
  10 #include <linux/types.h>
  11 #include <linux/kernel.h>
  12 #include <linux/sched.h>
  13 #include <asm/openprom.h>
  14 #include <asm/oplib.h>
  15 #include <linux/string.h>
  16
  17 extern void restore_current(void);
  18
  19 /* Non blocking put character to console device, returns -1 if
  20  * unsuccessful.
  21  */
  22 static int prom_nbputchar(const char *buf)
  23 {
  24         unsigned long flags;
  25         int i = -1;
  26
  27         spin_lock_irqsave(&prom_lock, flags);
  28         switch(prom_vers) {
  29         case PROM_V0:
  30                 if ((*(romvec->pv_nbputchar))(*buf))
  31                         i = 1;
  32                 break;
  33         case PROM_V2:
  34         case PROM_V3:
  35                 if ((*(romvec->pv_v2devops).v2_dev_write)(*romvec->pv_v2bootargs.fd_stdout,
  36                                                           buf, 0x1) == 1)
  37                         i = 1;
  38                 break;
  39         default:
  40                 break;
  41         }
  42         restore_current();
  43         spin_unlock_irqrestore(&prom_lock, flags);
  44         return i; /* Ugh, we could spin forever on unsupported proms ;( */
  45 }
  46
  47 void prom_console_write_buf(const char *buf, int len)
  48 {
  49         while (len) {
  50                 int n = prom_nbputchar(buf);
  51                 if (n < 0)
  52                         continue;
  53                 len--;
  54                 buf++;
  55         }
  56 }
  57