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      1 // SPDX-License-Identifier: GPL-2.0+
      2 /*
      3  * Copyright (C) 2016 Stefan Roese <sr (at) 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