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