LXR uboot/drivers/misc/cbmem

   1/*
   2 * Copyright (C) 2011 The ChromiumOS Authors.  All rights reserved.
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License as published by
   6 * the Free Software Foundation; version 2 of the License.
   7 *
   8 * This program is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 * GNU General Public License for more details.
  12 *
  13 * You should have received a copy of the GNU General Public License
  14 * along with this program; if not, write to the Free Software
  15 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
  16 */
  17
  18#include <common.h>
  19
  20#ifndef CONFIG_SYS_COREBOOT
  21#error This driver requires coreboot
  22#endif
  23
  24#include <asm/arch/sysinfo.h>
  25
  26struct cbmem_console {
  27        u32 buffer_size;
  28        u32 buffer_cursor;
  29        u8  buffer_body[0];
  30}  __attribute__ ((__packed__));
  31
  32static struct cbmem_console *cbmem_console_p;
  33
  34void cbmemc_putc(char data)
  35{
  36        int cursor;
  37
  38        cursor = cbmem_console_p->buffer_cursor++;
  39        if (cursor < cbmem_console_p->buffer_size)
  40                cbmem_console_p->buffer_body[cursor] = data;
  41}
  42
  43void cbmemc_puts(const char *str)
  44{
  45        char c;
  46
  47        while ((c = *str++) != 0)
  48                cbmemc_putc(c);
  49}
  50
  51int cbmemc_init(void)
  52{
  53        int rc;
  54        struct stdio_dev cons_dev;
  55        cbmem_console_p = lib_sysinfo.cbmem_cons;
  56
  57        memset(&cons_dev, 0, sizeof(cons_dev));
  58
  59        strcpy(cons_dev.name, "cbmem");
  60        cons_dev.flags = DEV_FLAGS_OUTPUT; /* Output only */
  61        cons_dev.putc  = cbmemc_putc;
  62        cons_dev.puts  = cbmemc_puts;
  63
  64        rc = stdio_register(&cons_dev);
  65
  66        return (rc == 0) ? 1 : rc;
  67}
  68