LXR uboot/drivers/misc/cbmem

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (C) 2011 The ChromiumOS Authors.  All rights reserved.
   4 */
   5
   6#include <common.h>
   7#include <console.h>
   8#ifndef CONFIG_SYS_COREBOOT
   9#error This driver requires coreboot
  10#endif
  11
  12#include <asm/cb_sysinfo.h>
  13
  14struct cbmem_console {
  15        u32 buffer_size;
  16        u32 buffer_cursor;
  17        u8  buffer_body[0];
  18}  __attribute__ ((__packed__));
  19
  20static struct cbmem_console *cbmem_console_p;
  21
  22void cbmemc_putc(struct stdio_dev *dev, char data)
  23{
  24        int cursor;
  25
  26        cursor = cbmem_console_p->buffer_cursor++;
  27        if (cursor < cbmem_console_p->buffer_size)
  28                cbmem_console_p->buffer_body[cursor] = data;
  29}
  30
  31void cbmemc_puts(struct stdio_dev *dev, const char *str)
  32{
  33        char c;
  34
  35        while ((c = *str++) != 0)
  36                cbmemc_putc(dev, c);
  37}
  38
  39int cbmemc_init(void)
  40{
  41        int rc;
  42        struct stdio_dev cons_dev;
  43        cbmem_console_p = lib_sysinfo.cbmem_cons;
  44
  45        memset(&cons_dev, 0, sizeof(cons_dev));
  46
  47        strcpy(cons_dev.name, "cbmem");
  48        cons_dev.flags = DEV_FLAGS_OUTPUT; /* Output only */
  49        cons_dev.putc  = cbmemc_putc;
  50        cons_dev.puts  = cbmemc_puts;
  51
  52        rc = stdio_register(&cons_dev);
  53
  54        return (rc == 0) ? 1 : rc;
  55}
  56