drivers/misc/smsc_lpc47m.c

   1 /*
   2  * Copyright (C) 2014, Bin Meng <bmeng.cn@gmail.com>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <asm/io.h>
   9 #include <asm/pnp_def.h>
  10
  11 static void pnp_enter_conf_state(u16 dev)
  12 {
  13         u16 port = dev >> 8;
  14
  15         outb(0x55, port);
  16 }
  17
  18 static void pnp_exit_conf_state(u16 dev)
  19 {
  20         u16 port = dev >> 8;
  21
  22         outb(0xaa, port);
  23 }
  24
  25 void lpc47m_enable_serial(u16 dev, u16 iobase, u8 irq)
  26 {
  27         pnp_enter_conf_state(dev);
  28         pnp_set_logical_device(dev);
  29         pnp_set_enable(dev, 0);
  30         pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
  31         pnp_set_irq(dev, PNP_IDX_IRQ0, irq);
  32         pnp_set_enable(dev, 1);
  33         pnp_exit_conf_state(dev);
  34 }