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