1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2016 Stefan Roese <sr@denx.de>
4 */
5
6 #include <common.h>
7 #include <nuvoton_nct6102d.h>
8 #include <asm/io.h>
9 #include <asm/pnp_def.h>
10
superio_outb(int reg,int val)11 static void superio_outb(int reg, int val)
12 {
13 outb(reg, NCT_EFER);
14 outb(val, NCT_EFDR);
15 }
16
superio_inb(int reg)17 static inline int superio_inb(int reg)
18 {
19 outb(reg, NCT_EFER);
20 return inb(NCT_EFDR);
21 }
22
superio_enter(void)23 static int superio_enter(void)
24 {
25 outb(NCT_ENTRY_KEY, NCT_EFER); /* Enter extended function mode */
26 outb(NCT_ENTRY_KEY, NCT_EFER); /* Again according to manual */
27
28 return 0;
29 }
30
superio_select(int ld)31 static void superio_select(int ld)
32 {
33 superio_outb(NCT_LD_SELECT_REG, ld);
34 }
35
superio_exit(void)36 static void superio_exit(void)
37 {
38 outb(NCT_EXIT_KEY, NCT_EFER); /* Leave extended function mode */
39 }
40
41 /*
42 * The Nuvoton NCT6102D starts per default after reset with both,
43 * the internal watchdog and the internal legacy UART enabled. This
44 * code provides a function to disable the watchdog.
45 */
nct6102d_wdt_disable(void)46 int nct6102d_wdt_disable(void)
47 {
48 superio_enter();
49 /* Select logical device for WDT */
50 superio_select(NCT6102D_LD_WDT);
51 superio_outb(NCT6102D_WDT_TIMEOUT, 0x00);
52 superio_exit();
53
54 return 0;
55 }
56