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 
11 static void superio_outb(int reg, int val)
12 {
13 	outb(reg, NCT_EFER);
14 	outb(val, NCT_EFDR);
15 }
16 
17 static inline int superio_inb(int reg)
18 {
19 	outb(reg, NCT_EFER);
20 	return inb(NCT_EFDR);
21 }
22 
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 
31 static void superio_select(int ld)
32 {
33 	superio_outb(NCT_LD_SELECT_REG, ld);
34 }
35 
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  */
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