LXR uboot/drivers/misc/winbond

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2016 Stefan Roese <sr@denx.de>
   4 */
   5
   6#include <common.h>
   7#include <asm/io.h>
   8#include <asm/pnp_def.h>
   9
  10#define WINBOND_ENTRY_KEY       0x87
  11#define WINBOND_EXIT_KEY        0xaa
  12
  13/* Enable configuration: pass entry key '0x87' into index port dev twice */
  14static void pnp_enter_conf_state(u16 dev)
  15{
  16        u16 port = dev >> 8;
  17
  18        outb(WINBOND_ENTRY_KEY, port);
  19        outb(WINBOND_ENTRY_KEY, port);
  20}
  21
  22/* Disable configuration: pass exit key '0xAA' into index port dev */
  23static void pnp_exit_conf_state(u16 dev)
  24{
  25        u16 port = dev >> 8;
  26
  27        outb(WINBOND_EXIT_KEY, port);
  28}
  29
  30/* Bring up early serial debugging output before the RAM is initialized */
  31void winbond_enable_serial(uint dev, uint iobase, uint irq)
  32{
  33        pnp_enter_conf_state(dev);
  34        pnp_set_logical_device(dev);
  35        pnp_set_enable(dev, 0);
  36        pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
  37        pnp_set_irq(dev, PNP_IDX_IRQ0, irq);
  38        pnp_set_enable(dev, 1);
  39        pnp_exit_conf_state(dev);
  40}
  41