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This simple driver provides some functions to control some of the integrated devices. The watchdog is enabled per default. This driver adds a function to disable the watchdog. Also the internal legacy UART (io address 0x3f8/0x2f8) is enabled per default. Signed-off-by: Stefan Roese <sr@denx.de> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Cc: Simon Glass <sjg@chromium.org>
56 lines
1.1 KiB
C
56 lines
1.1 KiB
C
/*
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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 <nuvoton_nct6102d.h>
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#include <asm/io.h>
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#include <asm/pnp_def.h>
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static void superio_outb(int reg, int val)
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{
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outb(reg, NCT_EFER);
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outb(val, NCT_EFDR);
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}
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static inline int superio_inb(int reg)
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{
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outb(reg, NCT_EFER);
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return inb(NCT_EFDR);
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}
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static int superio_enter(void)
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{
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outb(NCT_ENTRY_KEY, NCT_EFER); /* Enter extended function mode */
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outb(NCT_ENTRY_KEY, NCT_EFER); /* Again according to manual */
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return 0;
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}
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static void superio_select(int ld)
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{
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superio_outb(NCT_LD_SELECT_REG, ld);
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}
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static void superio_exit(void)
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{
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outb(NCT_EXIT_KEY, NCT_EFER); /* Leave extended function mode */
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}
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/*
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* The Nuvoton NCT6102D starts per default after reset with both,
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* the internal watchdog and the internal legacy UART enabled. This
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* code provides a function to disable the watchdog.
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*/
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int nct6102d_wdt_disable(void)
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{
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superio_enter();
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/* Select logical device for WDT */
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superio_select(NCT6102D_LD_WDT);
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superio_outb(NCT6102D_WDT_TIMEOUT, 0x00);
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superio_exit();
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return 0;
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}
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