winbond_w83627.c
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/*
* Copyright (C) 2016 Stefan Roese <sr@denx.de>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/pnp_def.h>
#define WINBOND_ENTRY_KEY 0x87
#define WINBOND_EXIT_KEY 0xaa
/* Enable configuration: pass entry key '0x87' into index port dev twice */
static void pnp_enter_conf_state(u16 dev)
{
u16 port = dev >> 8;
outb(WINBOND_ENTRY_KEY, port);
outb(WINBOND_ENTRY_KEY, port);
}
/* Disable configuration: pass exit key '0xAA' into index port dev */
static void pnp_exit_conf_state(u16 dev)
{
u16 port = dev >> 8;
outb(WINBOND_EXIT_KEY, port);
}
/* Bring up early serial debugging output before the RAM is initialized */
void winbond_enable_serial(uint dev, uint iobase, uint irq)
{
pnp_enter_conf_state(dev);
pnp_set_logical_device(dev);
pnp_set_enable(dev, 0);
pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
pnp_set_irq(dev, PNP_IDX_IRQ0, irq);
pnp_set_enable(dev, 1);
pnp_exit_conf_state(dev);
}