--- /dev/null
+/*
+ * 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"
+#define DRV_VERSION "1.13"
+
+#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);
+
+ /* And Initialize SCL for RS5C313 clock */
+ scsptr1_data = __raw_readb(SCSPTR1) | SCL; /* SCL:H */
+ __raw_writeb(scsptr1_data, SCSPTR1);
+ scsptr1_data = __raw_readb(SCSPTR1) | SCL_OEN; /* SCL output enable */
+ __raw_writeb(scsptr1_data, SCSPTR1);
+ RS5C313_CEDISABLE; /* CE:L */
+}
+
+static void rs5c313_write_data(unsigned char data)
+{
+ int i;
+
+ for (i = 0; i < 8; i++) {
+ /* SDA:Write Data */
+ scsptr1_data = (scsptr1_data & ~SDA) |
+ ((((0x80 >> i) & data) >> (7 - i)) << 2);
+ __raw_writeb(scsptr1_data, SCSPTR1);
+ if (i == 0) {
+ scsptr1_data |= SDA_OEN; /* SDA:output enable */
+ __raw_writeb(scsptr1_data, SCSPTR1);
+ }
+ ndelay(700);
+ scsptr1_data &= ~SCL; /* SCL:L */
+ __raw_writeb(scsptr1_data, SCSPTR1);
+ ndelay(700);
+ scsptr1_data |= SCL; /* SCL:H */
+ __raw_writeb(scsptr1_data, SCSPTR1);
+ }
+
+ scsptr1_data &= ~SDA_OEN; /* SDA:output disable */
+ __raw_writeb(scsptr1_data, SCSPTR1);
+}
+
+static unsigned char rs5c313_read_data(void)
+{
+ int i;
+ unsigned char data = 0;
+
+ for (i = 0; i < 8; i++) {
+ ndelay(700);
+ /* SDA:Read Data */
+ data |= ((__raw_readb(SCSPTR1) & SDA) >> 2) << (7 - i);
+ scsptr1_data &= ~SCL; /* SCL:L */
+ __raw_writeb(scsptr1_data, SCSPTR1);
+ ndelay(700);
+ scsptr1_data |= SCL; /* SCL:H */
+ __raw_writeb(scsptr1_data, SCSPTR1);
+ }
+ return data & 0x0F;
+}
+
+#endif /* CONFIG_SH_LANDISK */
+
+/*****************************************************/
+/* machine independence part of RS5C313 */
+/*****************************************************/
+
+/* RICOH RS5C313 address */
+#define RS5C313_ADDR_SEC 0x00
+#define RS5C313_ADDR_SEC10 0x01
+#define RS5C313_ADDR_MIN 0x02
+#define RS5C313_ADDR_MIN10 0x03
+#define RS5C313_ADDR_HOUR 0x04
+#define RS5C313_ADDR_HOUR10 0x05
+#define RS5C313_ADDR_WEEK 0x06
+#define RS5C313_ADDR_INTINTVREG 0x07
+#define RS5C313_ADDR_DAY 0x08
+#define RS5C313_ADDR_DAY10 0x09
+#define RS5C313_ADDR_MON 0x0A
+#define RS5C313_ADDR_MON10 0x0B
+#define RS5C313_ADDR_YEAR 0x0C
+#define RS5C313_ADDR_YEAR10 0x0D
+#define RS5C313_ADDR_CNTREG 0x0E
+#define RS5C313_ADDR_TESTREG 0x0F
+
+/* RICOH RS5C313 control register */
+#define RS5C313_CNTREG_ADJ_BSY 0x01
+#define RS5C313_CNTREG_WTEN_XSTP 0x02
+#define RS5C313_CNTREG_12_24 0x04
+#define RS5C313_CNTREG_CTFG 0x08
+
+/* RICOH RS5C313 test register */
+#define RS5C313_TESTREG_TEST 0x01
+
+/* RICOH RS5C313 control bit */
+#define RS5C313_CNTBIT_READ 0x40
+#define RS5C313_CNTBIT_AD 0x20
+#define RS5C313_CNTBIT_DT 0x10
+
+static unsigned char rs5c313_read_reg(unsigned char addr)
+{
+
+ rs5c313_write_data(addr | RS5C313_CNTBIT_READ | RS5C313_CNTBIT_AD);
+ return rs5c313_read_data();
+}
+
+static void rs5c313_write_reg(unsigned char addr, unsigned char data)
+{
+ data &= 0x0f;
+ rs5c313_write_data(addr | RS5C313_CNTBIT_AD);
+ rs5c313_write_data(data | RS5C313_CNTBIT_DT);
+ return;
+}
+
+static inline unsigned char rs5c313_read_cntreg(void)
+{
+ return rs5c313_read_reg(RS5C313_ADDR_CNTREG);
+}
+
+static inline void rs5c313_write_cntreg(unsigned char data)
+{
+ rs5c313_write_reg(RS5C313_ADDR_CNTREG, data);
+}
+
+static inline void rs5c313_write_intintvreg(unsigned char data)
+{
+ rs5c313_write_reg(RS5C313_ADDR_INTINTVREG, data);
+}
+
+static int rs5c313_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ int data;
+ int cnt;
+
+ cnt = 0;
+ while (1) {
+ RS5C313_CEENABLE; /* CE:H */
+
+ /* Initialize control reg. 24 hour */
+ rs5c313_write_cntreg(0x04);
+
+ if (!(rs5c313_read_cntreg() & RS5C313_CNTREG_ADJ_BSY))
+ break;
+
+ RS5C313_CEDISABLE;
+ ndelay(700); /* CE:L */
+
+ if (cnt++ > 100) {
+ dev_err(dev, "%s: timeout error\n", __func__);
+ return -EIO;
+ }
+ }
+
+ data = rs5c313_read_reg(RS5C313_ADDR_SEC);
+ data |= (rs5c313_read_reg(RS5C313_ADDR_SEC10) << 4);
+ tm->tm_sec = bcd2bin(data);
+
+ data = rs5c313_read_reg(RS5C313_ADDR_MIN);
+ data |= (rs5c313_read_reg(RS5C313_ADDR_MIN10) << 4);
+ tm->tm_min = bcd2bin(data);
+
+ data = rs5c313_read_reg(RS5C313_ADDR_HOUR);
+ data |= (rs5c313_read_reg(RS5C313_ADDR_HOUR10) << 4);
+ tm->tm_hour = bcd2bin(data);
+
+ data = rs5c313_read_reg(RS5C313_ADDR_DAY);
+ data |= (rs5c313_read_reg(RS5C313_ADDR_DAY10) << 4);
+ tm->tm_mday = bcd2bin(data);
+
+ data = rs5c313_read_reg(RS5C313_ADDR_MON);
+ data |= (rs5c313_read_reg(RS5C313_ADDR_MON10) << 4);
+ tm->tm_mon = bcd2bin(data) - 1;
+
+ data = rs5c313_read_reg(RS5C313_ADDR_YEAR);
+ data |= (rs5c313_read_reg(RS5C313_ADDR_YEAR10) << 4);
+ tm->tm_year = bcd2bin(data);
+
+ if (tm->tm_year < 70)
+ tm->tm_year += 100;
+
+ data = rs5c313_read_reg(RS5C313_ADDR_WEEK);
+ tm->tm_wday = bcd2bin(data);
+
+ RS5C313_CEDISABLE;
+ ndelay(700); /* CE:L */
+
+ return 0;
+}
+
+static int rs5c313_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ int data;
+ int cnt;
+
+ cnt = 0;
+ /* busy check. */
+ while (1) {
+ RS5C313_CEENABLE; /* CE:H */
+
+ /* Initiatlize control reg. 24 hour */
+ rs5c313_write_cntreg(0x04);
+
+ if (!(rs5c313_read_cntreg() & RS5C313_CNTREG_ADJ_BSY))
+ break;
+ RS5C313_MISCOP;
+ RS5C313_CEDISABLE;
+ ndelay(700); /* CE:L */
+
+ if (cnt++ > 100) {
+ dev_err(dev, "%s: timeout error\n", __func__);
+ return -EIO;
+ }
+ }
+
+ data = bin2bcd(tm->tm_sec);
+ rs5c313_write_reg(RS5C313_ADDR_SEC, data);
+ rs5c313_write_reg(RS5C313_ADDR_SEC10, (data >> 4));
+
+ data = bin2bcd(tm->tm_min);
+ rs5c313_write_reg(RS5C313_ADDR_MIN, data);
+ rs5c313_write_reg(RS5C313_ADDR_MIN10, (data >> 4));
+
+ data = bin2bcd(tm->tm_hour);
+ rs5c313_write_reg(RS5C313_ADDR_HOUR, data);
+ rs5c313_write_reg(RS5C313_ADDR_HOUR10, (data >> 4));
+
+ data = bin2bcd(tm->tm_mday);
+ rs5c313_write_reg(RS5C313_ADDR_DAY, data);
+ rs5c313_write_reg(RS5C313_ADDR_DAY10, (data >> 4));
+
+ data = bin2bcd(tm->tm_mon + 1);
+ rs5c313_write_reg(RS5C313_ADDR_MON, data);
+ rs5c313_write_reg(RS5C313_ADDR_MON10, (data >> 4));
+
+ data = bin2bcd(tm->tm_year % 100);
+ rs5c313_write_reg(RS5C313_ADDR_YEAR, data);
+ rs5c313_write_reg(RS5C313_ADDR_YEAR10, (data >> 4));
+
+ data = bin2bcd(tm->tm_wday);
+ rs5c313_write_reg(RS5C313_ADDR_WEEK, data);
+
+ RS5C313_CEDISABLE; /* CE:H */
+ ndelay(700);
+
+ return 0;
+}
+
+static void rs5c313_check_xstp_bit(void)
+{
+ struct rtc_time tm;
+ int cnt;
+
+ RS5C313_CEENABLE; /* CE:H */
+ if (rs5c313_read_cntreg() & RS5C313_CNTREG_WTEN_XSTP) {
+ /* INT interval reg. OFF */
+ rs5c313_write_intintvreg(0x00);
+ /* Initialize control reg. 24 hour & adjust */
+ rs5c313_write_cntreg(0x07);
+
+ /* busy check. */
+ for (cnt = 0; cnt < 100; cnt++) {
+ if (!(rs5c313_read_cntreg() & RS5C313_CNTREG_ADJ_BSY))
+ break;
+ RS5C313_MISCOP;
+ }
+
+ memset(&tm, 0, sizeof(struct rtc_time));
+ tm.tm_mday = 1;
+ tm.tm_mon = 1 - 1;
+ tm.tm_year = 2000 - 1900;
+
+ rs5c313_rtc_set_time(NULL, &tm);
+ pr_err("invalid value, resetting to 1 Jan 2000\n");
+ }
+ RS5C313_CEDISABLE;
+ ndelay(700); /* CE:L */
+}
+
+static const struct rtc_class_ops rs5c313_rtc_ops = {
+ .read_time = rs5c313_rtc_read_time,
+ .set_time = rs5c313_rtc_set_time,
+};
+
+static int rs5c313_rtc_probe(struct platform_device *pdev)
+{
+ struct rtc_device *rtc = devm_rtc_device_register(&pdev->dev, "rs5c313",
+ &rs5c313_rtc_ops, THIS_MODULE);
+
+ if (IS_ERR(rtc))
+ return PTR_ERR(rtc);
+
+ platform_set_drvdata(pdev, rtc);
+
+ return 0;
+}
+
+static struct platform_driver rs5c313_rtc_platform_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ },
+ .probe = rs5c313_rtc_probe,
+};
+
+static int __init rs5c313_rtc_init(void)
+{
+ int err;
+
+ err = platform_driver_register(&rs5c313_rtc_platform_driver);
+ if (err)
+ return err;
+
+ rs5c313_init_port();
+ rs5c313_check_xstp_bit();
+
+ return 0;
+}
+
+static void __exit rs5c313_rtc_exit(void)
+{
+ platform_driver_unregister(&rs5c313_rtc_platform_driver);
+}
+
+module_init(rs5c313_rtc_init);
+module_exit(rs5c313_rtc_exit);
+
+MODULE_VERSION(DRV_VERSION);
+MODULE_AUTHOR("kogiidena , Nobuhiro Iwamatsu <iwamatsu@nigauri.org>");
+MODULE_DESCRIPTION("Ricoh RS5C313 RTC device driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
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