uboot-phytec

// SPDX-License-Identifier: GPL-2.0+

/*

 * (C) Copyright 2002 SIXNET, dge@sixnetio.com.

 *

 * (C) Copyright 2004, Li-Pro.Net <www.li-pro.net>

 * Stephan Linz <linz@li-pro.net>

 */

​

/*

 * Date & Time support for DS1306 RTC using SPI:

 *

 *    - SXNI855T:    it uses its own soft SPI here in this file

 *    - all other:   use the external spi_xfer() function

 *                   (see include/spi.h)

 */

​

#include <common.h>

#include <command.h>

#include <rtc.h>

#include <spi.h>

​

#define RTC_SECONDS     0x00

#define RTC_MINUTES     0x01

#define RTC_HOURS       0x02

#define RTC_DAY_OF_WEEK     0x03

#define RTC_DATE_OF_MONTH   0x04

#define RTC_MONTH       0x05

#define RTC_YEAR        0x06

​

#define RTC_SECONDS_ALARM0  0x07

#define RTC_MINUTES_ALARM0  0x08

#define RTC_HOURS_ALARM0    0x09

#define RTC_DAY_OF_WEEK_ALARM0  0x0a

​

#define RTC_SECONDS_ALARM1  0x0b

#define RTC_MINUTES_ALARM1  0x0c

#define RTC_HOURS_ALARM1    0x0d

#define RTC_DAY_OF_WEEK_ALARM1  0x0e

​

#define RTC_CONTROL     0x0f

#define RTC_STATUS      0x10

#define RTC_TRICKLE_CHARGER 0x11

​

#define RTC_USER_RAM_BASE   0x20

​

/* ************************************************************************* */

#ifdef CONFIG_SXNI855T      /* !!! SHOULD BE CHANGED TO NEW CODE !!! */

​

static void soft_spi_send (unsigned char n);

static unsigned char soft_spi_read (void);

static void init_spi (void);

​

/*-----------------------------------------------------------------------

 * Definitions

 */

​

#define PB_SPISCK   0x00000002  /* PB 30 */

#define PB_SPIMOSI  0x00000004  /* PB 29 */

#define PB_SPIMISO  0x00000008  /* PB 28 */

#define PB_SPI_CE   0x00010000  /* PB 15 */

​

/* ------------------------------------------------------------------------- */

​

/* read clock time from DS1306 and return it in *tmp */

int rtc_get (struct rtc_time *tmp)

{

    volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;

    unsigned char spi_byte; /* Data Byte */

​

    init_spi ();        /* set port B for software SPI */

​

    /* Now we can enable the DS1306 RTC */

    immap->im_cpm.cp_pbdat |= PB_SPI_CE;

    udelay (10);

​

    /* Shift out the address (0) of the time in the Clock Chip */

    soft_spi_send (0);

​

    /* Put the clock readings into the rtc_time structure */

    tmp->tm_sec = bcd2bin (soft_spi_read ());   /* Read seconds */

    tmp->tm_min = bcd2bin (soft_spi_read ());   /* Read minutes */

​

    /* Hours are trickier */

    spi_byte = soft_spi_read ();    /* Read Hours into temporary value */

    if (spi_byte & 0x40) {

        /* 12 hour mode bit is set (time is in 1-12 format) */

        if (spi_byte & 0x20) {

            /* since PM we add 11 to get 0-23 for hours */

            tmp->tm_hour = (bcd2bin (spi_byte & 0x1F)) + 11;

        } else {

            /* since AM we subtract 1 to get 0-23 for hours */

            tmp->tm_hour = (bcd2bin (spi_byte & 0x1F)) - 1;