413 lines
10 KiB
C
413 lines
10 KiB
C
/*
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* Ricoh RS5C313 RTC device/driver
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* Copyright (C) 2007 Nobuhiro Iwamatsu
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*
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* 2005-09-19 modifed by kogiidena
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*
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* Based on the old drivers/char/rs5c313_rtc.c by:
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* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
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* Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka
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*
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* Based on code written by Paul Gortmaker.
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* Copyright (C) 1996 Paul Gortmaker
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Based on other minimal char device drivers, like Alan's
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* watchdog, Ted's random, etc. etc.
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*
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* 1.07 Paul Gortmaker.
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* 1.08 Miquel van Smoorenburg: disallow certain things on the
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* DEC Alpha as the CMOS clock is also used for other things.
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* 1.09 Nikita Schmidt: epoch support and some Alpha cleanup.
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* 1.09a Pete Zaitcev: Sun SPARC
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* 1.09b Jeff Garzik: Modularize, init cleanup
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* 1.09c Jeff Garzik: SMP cleanup
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* 1.10 Paul Barton-Davis: add support for async I/O
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* 1.10a Andrea Arcangeli: Alpha updates
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* 1.10b Andrew Morton: SMP lock fix
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* 1.10c Cesar Barros: SMP locking fixes and cleanup
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* 1.10d Paul Gortmaker: delete paranoia check in rtc_exit
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* 1.10e Maciej W. Rozycki: Handle DECstation's year weirdness.
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* 1.11 Takashi Iwai: Kernel access functions
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* rtc_register/rtc_unregister/rtc_control
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* 1.11a Daniele Bellucci: Audit create_proc_read_entry in rtc_init
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* 1.12 Venkatesh Pallipadi: Hooks for emulating rtc on HPET base-timer
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* CONFIG_HPET_EMULATE_RTC
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* 1.13 Nobuhiro Iwamatsu: Updata driver.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/rtc.h>
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#include <linux/platform_device.h>
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#include <linux/bcd.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#define DRV_NAME "rs5c313"
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#ifdef CONFIG_SH_LANDISK
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/*****************************************************/
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/* LANDISK dependence part of RS5C313 */
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/*****************************************************/
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#define SCSMR1 0xFFE00000
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#define SCSCR1 0xFFE00008
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#define SCSMR1_CA 0x80
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#define SCSCR1_CKE 0x03
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#define SCSPTR1 0xFFE0001C
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#define SCSPTR1_EIO 0x80
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#define SCSPTR1_SPB1IO 0x08
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#define SCSPTR1_SPB1DT 0x04
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#define SCSPTR1_SPB0IO 0x02
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#define SCSPTR1_SPB0DT 0x01
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#define SDA_OEN SCSPTR1_SPB1IO
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#define SDA SCSPTR1_SPB1DT
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#define SCL_OEN SCSPTR1_SPB0IO
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#define SCL SCSPTR1_SPB0DT
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/* RICOH RS5C313 CE port */
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#define RS5C313_CE 0xB0000003
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/* RICOH RS5C313 CE port bit */
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#define RS5C313_CE_RTCCE 0x02
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/* SCSPTR1 data */
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unsigned char scsptr1_data;
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#define RS5C313_CEENABLE __raw_writeb(RS5C313_CE_RTCCE, RS5C313_CE);
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#define RS5C313_CEDISABLE __raw_writeb(0x00, RS5C313_CE)
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#define RS5C313_MISCOP __raw_writeb(0x02, 0xB0000008)
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static void rs5c313_init_port(void)
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{
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/* Set SCK as I/O port and Initialize SCSPTR1 data & I/O port. */
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__raw_writeb(__raw_readb(SCSMR1) & ~SCSMR1_CA, SCSMR1);
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__raw_writeb(__raw_readb(SCSCR1) & ~SCSCR1_CKE, SCSCR1);
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/* And Initialize SCL for RS5C313 clock */
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scsptr1_data = __raw_readb(SCSPTR1) | SCL; /* SCL:H */
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__raw_writeb(scsptr1_data, SCSPTR1);
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scsptr1_data = __raw_readb(SCSPTR1) | SCL_OEN; /* SCL output enable */
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__raw_writeb(scsptr1_data, SCSPTR1);
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RS5C313_CEDISABLE; /* CE:L */
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}
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static void rs5c313_write_data(unsigned char data)
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{
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int i;
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for (i = 0; i < 8; i++) {
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/* SDA:Write Data */
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scsptr1_data = (scsptr1_data & ~SDA) |
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((((0x80 >> i) & data) >> (7 - i)) << 2);
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__raw_writeb(scsptr1_data, SCSPTR1);
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if (i == 0) {
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scsptr1_data |= SDA_OEN; /* SDA:output enable */
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__raw_writeb(scsptr1_data, SCSPTR1);
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}
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ndelay(700);
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scsptr1_data &= ~SCL; /* SCL:L */
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__raw_writeb(scsptr1_data, SCSPTR1);
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ndelay(700);
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scsptr1_data |= SCL; /* SCL:H */
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__raw_writeb(scsptr1_data, SCSPTR1);
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}
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scsptr1_data &= ~SDA_OEN; /* SDA:output disable */
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__raw_writeb(scsptr1_data, SCSPTR1);
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}
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static unsigned char rs5c313_read_data(void)
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{
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int i;
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unsigned char data = 0;
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for (i = 0; i < 8; i++) {
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ndelay(700);
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/* SDA:Read Data */
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data |= ((__raw_readb(SCSPTR1) & SDA) >> 2) << (7 - i);
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scsptr1_data &= ~SCL; /* SCL:L */
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__raw_writeb(scsptr1_data, SCSPTR1);
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ndelay(700);
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scsptr1_data |= SCL; /* SCL:H */
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__raw_writeb(scsptr1_data, SCSPTR1);
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}
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return data & 0x0F;
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}
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#endif /* CONFIG_SH_LANDISK */
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/*****************************************************/
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/* machine independence part of RS5C313 */
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/*****************************************************/
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/* RICOH RS5C313 address */
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#define RS5C313_ADDR_SEC 0x00
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#define RS5C313_ADDR_SEC10 0x01
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#define RS5C313_ADDR_MIN 0x02
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#define RS5C313_ADDR_MIN10 0x03
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#define RS5C313_ADDR_HOUR 0x04
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#define RS5C313_ADDR_HOUR10 0x05
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#define RS5C313_ADDR_WEEK 0x06
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#define RS5C313_ADDR_INTINTVREG 0x07
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#define RS5C313_ADDR_DAY 0x08
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#define RS5C313_ADDR_DAY10 0x09
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#define RS5C313_ADDR_MON 0x0A
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#define RS5C313_ADDR_MON10 0x0B
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#define RS5C313_ADDR_YEAR 0x0C
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#define RS5C313_ADDR_YEAR10 0x0D
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#define RS5C313_ADDR_CNTREG 0x0E
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#define RS5C313_ADDR_TESTREG 0x0F
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/* RICOH RS5C313 control register */
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#define RS5C313_CNTREG_ADJ_BSY 0x01
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#define RS5C313_CNTREG_WTEN_XSTP 0x02
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#define RS5C313_CNTREG_12_24 0x04
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#define RS5C313_CNTREG_CTFG 0x08
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/* RICOH RS5C313 test register */
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#define RS5C313_TESTREG_TEST 0x01
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/* RICOH RS5C313 control bit */
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#define RS5C313_CNTBIT_READ 0x40
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#define RS5C313_CNTBIT_AD 0x20
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#define RS5C313_CNTBIT_DT 0x10
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static unsigned char rs5c313_read_reg(unsigned char addr)
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{
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rs5c313_write_data(addr | RS5C313_CNTBIT_READ | RS5C313_CNTBIT_AD);
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return rs5c313_read_data();
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}
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static void rs5c313_write_reg(unsigned char addr, unsigned char data)
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{
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data &= 0x0f;
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rs5c313_write_data(addr | RS5C313_CNTBIT_AD);
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rs5c313_write_data(data | RS5C313_CNTBIT_DT);
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return;
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}
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static inline unsigned char rs5c313_read_cntreg(void)
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{
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return rs5c313_read_reg(RS5C313_ADDR_CNTREG);
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}
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static inline void rs5c313_write_cntreg(unsigned char data)
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{
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rs5c313_write_reg(RS5C313_ADDR_CNTREG, data);
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}
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static inline void rs5c313_write_intintvreg(unsigned char data)
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{
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rs5c313_write_reg(RS5C313_ADDR_INTINTVREG, data);
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}
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static int rs5c313_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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int data;
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int cnt;
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cnt = 0;
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while (1) {
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RS5C313_CEENABLE; /* CE:H */
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/* Initialize control reg. 24 hour */
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rs5c313_write_cntreg(0x04);
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if (!(rs5c313_read_cntreg() & RS5C313_CNTREG_ADJ_BSY))
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break;
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RS5C313_CEDISABLE;
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ndelay(700); /* CE:L */
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if (cnt++ > 100) {
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dev_err(dev, "%s: timeout error\n", __func__);
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return -EIO;
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}
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}
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data = rs5c313_read_reg(RS5C313_ADDR_SEC);
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data |= (rs5c313_read_reg(RS5C313_ADDR_SEC10) << 4);
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tm->tm_sec = bcd2bin(data);
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data = rs5c313_read_reg(RS5C313_ADDR_MIN);
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data |= (rs5c313_read_reg(RS5C313_ADDR_MIN10) << 4);
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tm->tm_min = bcd2bin(data);
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data = rs5c313_read_reg(RS5C313_ADDR_HOUR);
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data |= (rs5c313_read_reg(RS5C313_ADDR_HOUR10) << 4);
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tm->tm_hour = bcd2bin(data);
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data = rs5c313_read_reg(RS5C313_ADDR_DAY);
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data |= (rs5c313_read_reg(RS5C313_ADDR_DAY10) << 4);
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tm->tm_mday = bcd2bin(data);
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data = rs5c313_read_reg(RS5C313_ADDR_MON);
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data |= (rs5c313_read_reg(RS5C313_ADDR_MON10) << 4);
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tm->tm_mon = bcd2bin(data) - 1;
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data = rs5c313_read_reg(RS5C313_ADDR_YEAR);
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data |= (rs5c313_read_reg(RS5C313_ADDR_YEAR10) << 4);
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tm->tm_year = bcd2bin(data);
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if (tm->tm_year < 70)
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tm->tm_year += 100;
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data = rs5c313_read_reg(RS5C313_ADDR_WEEK);
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tm->tm_wday = bcd2bin(data);
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RS5C313_CEDISABLE;
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ndelay(700); /* CE:L */
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return 0;
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}
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static int rs5c313_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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int data;
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int cnt;
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cnt = 0;
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/* busy check. */
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while (1) {
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RS5C313_CEENABLE; /* CE:H */
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/* Initiatlize control reg. 24 hour */
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rs5c313_write_cntreg(0x04);
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if (!(rs5c313_read_cntreg() & RS5C313_CNTREG_ADJ_BSY))
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break;
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RS5C313_MISCOP;
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RS5C313_CEDISABLE;
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ndelay(700); /* CE:L */
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if (cnt++ > 100) {
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dev_err(dev, "%s: timeout error\n", __func__);
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return -EIO;
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}
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}
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data = bin2bcd(tm->tm_sec);
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rs5c313_write_reg(RS5C313_ADDR_SEC, data);
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rs5c313_write_reg(RS5C313_ADDR_SEC10, (data >> 4));
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data = bin2bcd(tm->tm_min);
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rs5c313_write_reg(RS5C313_ADDR_MIN, data);
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rs5c313_write_reg(RS5C313_ADDR_MIN10, (data >> 4));
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data = bin2bcd(tm->tm_hour);
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rs5c313_write_reg(RS5C313_ADDR_HOUR, data);
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rs5c313_write_reg(RS5C313_ADDR_HOUR10, (data >> 4));
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data = bin2bcd(tm->tm_mday);
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rs5c313_write_reg(RS5C313_ADDR_DAY, data);
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rs5c313_write_reg(RS5C313_ADDR_DAY10, (data >> 4));
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data = bin2bcd(tm->tm_mon + 1);
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rs5c313_write_reg(RS5C313_ADDR_MON, data);
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rs5c313_write_reg(RS5C313_ADDR_MON10, (data >> 4));
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data = bin2bcd(tm->tm_year % 100);
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rs5c313_write_reg(RS5C313_ADDR_YEAR, data);
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rs5c313_write_reg(RS5C313_ADDR_YEAR10, (data >> 4));
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data = bin2bcd(tm->tm_wday);
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rs5c313_write_reg(RS5C313_ADDR_WEEK, data);
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RS5C313_CEDISABLE; /* CE:H */
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ndelay(700);
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return 0;
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}
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static void rs5c313_check_xstp_bit(void)
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{
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struct rtc_time tm;
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int cnt;
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RS5C313_CEENABLE; /* CE:H */
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if (rs5c313_read_cntreg() & RS5C313_CNTREG_WTEN_XSTP) {
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/* INT interval reg. OFF */
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rs5c313_write_intintvreg(0x00);
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/* Initialize control reg. 24 hour & adjust */
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rs5c313_write_cntreg(0x07);
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/* busy check. */
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for (cnt = 0; cnt < 100; cnt++) {
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if (!(rs5c313_read_cntreg() & RS5C313_CNTREG_ADJ_BSY))
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break;
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RS5C313_MISCOP;
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}
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memset(&tm, 0, sizeof(struct rtc_time));
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tm.tm_mday = 1;
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tm.tm_mon = 1 - 1;
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tm.tm_year = 2000 - 1900;
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rs5c313_rtc_set_time(NULL, &tm);
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pr_err("invalid value, resetting to 1 Jan 2000\n");
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}
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RS5C313_CEDISABLE;
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ndelay(700); /* CE:L */
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}
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static const struct rtc_class_ops rs5c313_rtc_ops = {
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.read_time = rs5c313_rtc_read_time,
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.set_time = rs5c313_rtc_set_time,
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};
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static int rs5c313_rtc_probe(struct platform_device *pdev)
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{
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struct rtc_device *rtc = devm_rtc_device_register(&pdev->dev, "rs5c313",
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&rs5c313_rtc_ops, THIS_MODULE);
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if (IS_ERR(rtc))
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return PTR_ERR(rtc);
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platform_set_drvdata(pdev, rtc);
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return 0;
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}
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static struct platform_driver rs5c313_rtc_platform_driver = {
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.driver = {
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.name = DRV_NAME,
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},
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.probe = rs5c313_rtc_probe,
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};
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static int __init rs5c313_rtc_init(void)
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{
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int err;
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err = platform_driver_register(&rs5c313_rtc_platform_driver);
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if (err)
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return err;
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rs5c313_init_port();
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rs5c313_check_xstp_bit();
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return 0;
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}
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static void __exit rs5c313_rtc_exit(void)
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{
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platform_driver_unregister(&rs5c313_rtc_platform_driver);
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}
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module_init(rs5c313_rtc_init);
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module_exit(rs5c313_rtc_exit);
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MODULE_AUTHOR("kogiidena , Nobuhiro Iwamatsu <iwamatsu@nigauri.org>");
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MODULE_DESCRIPTION("Ricoh RS5C313 RTC device driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:" DRV_NAME);
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