1*85056932SStefan Roese /*
2*85056932SStefan Roese * Copyright (C) 2016 Stefan Roese <sr@denx.de>
3*85056932SStefan Roese *
4*85056932SStefan Roese * SPDX-License-Identifier: GPL-2.0+
5*85056932SStefan Roese */
6*85056932SStefan Roese
7*85056932SStefan Roese #include <common.h>
8*85056932SStefan Roese #include <asm/io.h>
9*85056932SStefan Roese #include <asm/pnp_def.h>
10*85056932SStefan Roese
11*85056932SStefan Roese #define WINBOND_ENTRY_KEY 0x87
12*85056932SStefan Roese #define WINBOND_EXIT_KEY 0xaa
13*85056932SStefan Roese
14*85056932SStefan Roese /* Enable configuration: pass entry key '0x87' into index port dev twice */
pnp_enter_conf_state(u16 dev)15*85056932SStefan Roese static void pnp_enter_conf_state(u16 dev)
16*85056932SStefan Roese {
17*85056932SStefan Roese u16 port = dev >> 8;
18*85056932SStefan Roese
19*85056932SStefan Roese outb(WINBOND_ENTRY_KEY, port);
20*85056932SStefan Roese outb(WINBOND_ENTRY_KEY, port);
21*85056932SStefan Roese }
22*85056932SStefan Roese
23*85056932SStefan Roese /* Disable configuration: pass exit key '0xAA' into index port dev */
pnp_exit_conf_state(u16 dev)24*85056932SStefan Roese static void pnp_exit_conf_state(u16 dev)
25*85056932SStefan Roese {
26*85056932SStefan Roese u16 port = dev >> 8;
27*85056932SStefan Roese
28*85056932SStefan Roese outb(WINBOND_EXIT_KEY, port);
29*85056932SStefan Roese }
30*85056932SStefan Roese
31*85056932SStefan Roese /* Bring up early serial debugging output before the RAM is initialized */
winbond_enable_serial(uint dev,uint iobase,uint irq)32*85056932SStefan Roese void winbond_enable_serial(uint dev, uint iobase, uint irq)
33*85056932SStefan Roese {
34*85056932SStefan Roese pnp_enter_conf_state(dev);
35*85056932SStefan Roese pnp_set_logical_device(dev);
36*85056932SStefan Roese pnp_set_enable(dev, 0);
37*85056932SStefan Roese pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
38*85056932SStefan Roese pnp_set_irq(dev, PNP_IDX_IRQ0, irq);
39*85056932SStefan Roese pnp_set_enable(dev, 1);
40*85056932SStefan Roese pnp_exit_conf_state(dev);
41*85056932SStefan Roese }
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