1 /*
2  * Copyright (C) 2016 Stefan Roese <sr@denx.de>
3  *
4  * SPDX-License-Identifier:	GPL-2.0+
5  */
6 
7 #include <common.h>
8 #include <nuvoton_nct6102d.h>
9 #include <asm/io.h>
10 #include <asm/pnp_def.h>
11 
12 static void superio_outb(int reg, int val)
13 {
14 	outb(reg, NCT_EFER);
15 	outb(val, NCT_EFDR);
16 }
17 
18 static inline int superio_inb(int reg)
19 {
20 	outb(reg, NCT_EFER);
21 	return inb(NCT_EFDR);
22 }
23 
24 static int superio_enter(void)
25 {
26 	outb(NCT_ENTRY_KEY, NCT_EFER); /* Enter extended function mode */
27 	outb(NCT_ENTRY_KEY, NCT_EFER); /* Again according to manual */
28 
29 	return 0;
30 }
31 
32 static void superio_select(int ld)
33 {
34 	superio_outb(NCT_LD_SELECT_REG, ld);
35 }
36 
37 static void superio_exit(void)
38 {
39 	outb(NCT_EXIT_KEY, NCT_EFER); /* Leave extended function mode */
40 }
41 
42 /*
43  * The Nuvoton NCT6102D starts per default after reset with both,
44  * the internal watchdog and the internal legacy UART enabled. This
45  * code provides a function to disable the watchdog.
46  */
47 int nct6102d_wdt_disable(void)
48 {
49 	superio_enter();
50 	/* Select logical device for WDT */
51 	superio_select(NCT6102D_LD_WDT);
52 	superio_outb(NCT6102D_WDT_TIMEOUT, 0x00);
53 	superio_exit();
54 
55 	return 0;
56 }
57