linux-imx

/*

 * Ricoh RS5C313 RTC device/driver

 *  Copyright (C) 2007 Nobuhiro Iwamatsu

 *

 *  2005-09-19 modifed by kogiidena

 *

 * Based on the old drivers/char/rs5c313_rtc.c  by:

 *  Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>

 *  Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka

 *

 * Based on code written by Paul Gortmaker.

 *  Copyright (C) 1996 Paul Gortmaker

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 *

 * Based on other minimal char device drivers, like Alan's

 * watchdog, Ted's random, etc. etc.

 *

 *  1.07    Paul Gortmaker.

 *  1.08    Miquel van Smoorenburg: disallow certain things on the

 *      DEC Alpha as the CMOS clock is also used for other things.

 *  1.09    Nikita Schmidt: epoch support and some Alpha cleanup.

 *  1.09a   Pete Zaitcev: Sun SPARC

 *  1.09b   Jeff Garzik: Modularize, init cleanup

 *  1.09c   Jeff Garzik: SMP cleanup

 *  1.10    Paul Barton-Davis: add support for async I/O

 *  1.10a   Andrea Arcangeli: Alpha updates

 *  1.10b   Andrew Morton: SMP lock fix

 *  1.10c   Cesar Barros: SMP locking fixes and cleanup

 *  1.10d   Paul Gortmaker: delete paranoia check in rtc_exit

 *  1.10e   Maciej W. Rozycki: Handle DECstation's year weirdness.

 *      1.11    Takashi Iwai: Kernel access functions

 *                rtc_register/rtc_unregister/rtc_control

 *      1.11a   Daniele Bellucci: Audit create_proc_read_entry in rtc_init

 *  1.12    Venkatesh Pallipadi: Hooks for emulating rtc on HPET base-timer

 *      CONFIG_HPET_EMULATE_RTC

 *  1.13    Nobuhiro Iwamatsu: Updata driver.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/module.h>

#include <linux/err.h>

#include <linux/rtc.h>

#include <linux/platform_device.h>

#include <linux/bcd.h>

#include <linux/delay.h>

#include <linux/io.h>

​

#define DRV_NAME    "rs5c313"

​

#ifdef CONFIG_SH_LANDISK

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

/* LANDISK dependence part of RS5C313                */

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

​

#define SCSMR1      0xFFE00000

#define SCSCR1      0xFFE00008

#define SCSMR1_CA   0x80

#define SCSCR1_CKE  0x03

#define SCSPTR1     0xFFE0001C

#define SCSPTR1_EIO 0x80

#define SCSPTR1_SPB1IO  0x08

#define SCSPTR1_SPB1DT  0x04

#define SCSPTR1_SPB0IO  0x02

#define SCSPTR1_SPB0DT  0x01

​

#define SDA_OEN     SCSPTR1_SPB1IO

#define SDA     SCSPTR1_SPB1DT

#define SCL_OEN     SCSPTR1_SPB0IO

#define SCL     SCSPTR1_SPB0DT

​

/* RICOH RS5C313 CE port */

#define RS5C313_CE  0xB0000003

​

/* RICOH RS5C313 CE port bit */

#define RS5C313_CE_RTCCE    0x02

​

/* SCSPTR1 data */

unsigned char scsptr1_data;

​

#define RS5C313_CEENABLE    __raw_writeb(RS5C313_CE_RTCCE, RS5C313_CE);

#define RS5C313_CEDISABLE   __raw_writeb(0x00, RS5C313_CE)

#define RS5C313_MISCOP      __raw_writeb(0x02, 0xB0000008)

​

static void rs5c313_init_port(void)

{

    /* Set SCK as I/O port and Initialize SCSPTR1 data & I/O port. */

    __raw_writeb(__raw_readb(SCSMR1) & ~SCSMR1_CA, SCSMR1);

    __raw_writeb(__raw_readb(SCSCR1) & ~SCSCR1_CKE, SCSCR1);