[MIPS] Convert to RTC-class ds1742 driver

The generic rtc-ds1742 driver can be used for RBTX4927 and JMR3927
(with __swizzle_addr trick).  This patch also removes MIPS local
DS1742 stuff.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

3 files changed, 31 insertions, 181 deletions

diff --git a/arch/mips/jmr3927/common/Makefile b/arch/mips/jmr3927/common/Makefile
index cb09a8eede15..01e7db19bcbe 100644
--- a/arch/mips/jmr3927/common/Makefile
+++ b/arch/mips/jmr3927/common/Makefile
@@ -2,4 +2,4 @@
 # Makefile for the common code of TOSHIBA JMR-TX3927 board
 #
 
-obj-y    += prom.o puts.o rtc_ds1742.o
+obj-y    += prom.o puts.o
diff --git a/arch/mips/jmr3927/common/rtc_ds1742.c b/arch/mips/jmr3927/common/rtc_ds1742.c
deleted file mode 100644
index e6561345d12a..000000000000
--- a/arch/mips/jmr3927/common/rtc_ds1742.c
+++ /dev/null
@@ -1,171 +0,0 @@
-/*
- * Copyright 2001 MontaVista Software Inc.
- * Author: MontaVista Software, Inc.
- *              ahennessy@mvista.com
- *
- * arch/mips/jmr3927/common/rtc_ds1742.c
- * Based on arch/mips/ddb5xxx/common/rtc_ds1386.c
- *     low-level RTC hookups for s for Dallas 1742 chip.
- *
- * Copyright (C) 2000-2001 Toshiba Corporation
- *
- *  This program is free software; you can redistribute  it and/or modify it
- *  under  the terms of  the GNU General  Public License as published by the
- *  Free Software Foundation;  either version 2 of the  License, or (at your
- *  option) any later version.
- *
- *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
- *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
- *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
- *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
- *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
- *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
- *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
- *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- *  You should have received a copy of the  GNU General Public License along
- *  with this program; if not, write  to the Free Software Foundation, Inc.,
- *  675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-
-/*
- * This file exports a function, rtc_ds1386_init(), which expects an
- * uncached base address as the argument.  It will set the two function
- * pointers expected by the MIPS generic timer code.
- */
-
-#include <linux/bcd.h>
-#include <linux/types.h>
-#include <linux/time.h>
-#include <linux/rtc.h>
-#include <linux/ds1742rtc.h>
-
-#include <asm/time.h>
-#include <asm/addrspace.h>
-
-#include <asm/debug.h>
-
-#define EPOCH           2000
-
-static unsigned long rtc_base;
-
-static unsigned long
-rtc_ds1742_get_time(void)
-{
-        unsigned int year, month, day, hour, minute, second;
-        unsigned int century;
-        unsigned long flags;
-
-        spin_lock_irqsave(&rtc_lock, flags);
-        rtc_write(RTC_READ, RTC_CONTROL);
-        second = BCD2BIN(rtc_read(RTC_SECONDS) & RTC_SECONDS_MASK);
-        minute = BCD2BIN(rtc_read(RTC_MINUTES));
-        hour = BCD2BIN(rtc_read(RTC_HOURS));
-        day = BCD2BIN(rtc_read(RTC_DATE));
-        month = BCD2BIN(rtc_read(RTC_MONTH));
-        year = BCD2BIN(rtc_read(RTC_YEAR));
-        century = BCD2BIN(rtc_read(RTC_CENTURY) & RTC_CENTURY_MASK);
-        rtc_write(0, RTC_CONTROL);
-        spin_unlock_irqrestore(&rtc_lock, flags);
-
-        year += century * 100;
-
-        return mktime(year, month, day, hour, minute, second);
-}
-extern void to_tm(unsigned long tim, struct rtc_time * tm);
-
-static int
-rtc_ds1742_set_time(unsigned long t)
-{
-        struct rtc_time tm;
-        u8 year, month, day, hour, minute, second;
-        u8 cmos_year, cmos_month, cmos_day, cmos_hour, cmos_minute, cmos_second;
-        int cmos_century;
-        unsigned long flags;
-
-        spin_lock_irqsave(&rtc_lock, flags);
-        rtc_write(RTC_READ, RTC_CONTROL);
-        cmos_second = (u8)(rtc_read(RTC_SECONDS) & RTC_SECONDS_MASK);
-        cmos_minute = (u8)rtc_read(RTC_MINUTES);
-        cmos_hour = (u8)rtc_read(RTC_HOURS);
-        cmos_day = (u8)rtc_read(RTC_DATE);
-        cmos_month = (u8)rtc_read(RTC_MONTH);
-        cmos_year = (u8)rtc_read(RTC_YEAR);
-        cmos_century = rtc_read(RTC_CENTURY) & RTC_CENTURY_MASK;
-
-        rtc_write(RTC_WRITE, RTC_CONTROL);
-
-        /* convert */
-        to_tm(t, &tm);
-
-        /* check each field one by one */
-        year = BIN2BCD(tm.tm_year - EPOCH);
-        if (year != cmos_year) {
-                rtc_write(year,RTC_YEAR);
-        }
-
-        month = BIN2BCD(tm.tm_mon);
-        if (month != (cmos_month & 0x1f)) {
-                rtc_write((month & 0x1f) | (cmos_month & ~0x1f),RTC_MONTH);
-        }
-
-        day = BIN2BCD(tm.tm_mday);
-        if (day != cmos_day) {
-
-                rtc_write(day, RTC_DATE);
-        }
-
-        if (cmos_hour & 0x40) {
-                /* 12 hour format */
-                hour = 0x40;
-                if (tm.tm_hour > 12) {
-                        hour |= 0x20 | (BIN2BCD(hour-12) & 0x1f);
-                } else {
-                        hour |= BIN2BCD(tm.tm_hour);
-                }
-        } else {
-                /* 24 hour format */
-                hour = BIN2BCD(tm.tm_hour) & 0x3f;
-        }
-        if (hour != cmos_hour) rtc_write(hour, RTC_HOURS);
-
-        minute = BIN2BCD(tm.tm_min);
-        if (minute !=  cmos_minute) {
-                rtc_write(minute, RTC_MINUTES);
-        }
-
-        second = BIN2BCD(tm.tm_sec);
-        if (second !=  cmos_second) {
-                rtc_write(second & RTC_SECONDS_MASK,RTC_SECONDS);
-        }
-
-        /* RTC_CENTURY and RTC_CONTROL share same address... */
-        rtc_write(cmos_century, RTC_CONTROL);
-        spin_unlock_irqrestore(&rtc_lock, flags);
-
-        return 0;
-}
-
-void
-rtc_ds1742_init(unsigned long base)
-{
-        u8  cmos_second;
-
-        /* remember the base */
-        rtc_base = base;
-        db_assert((rtc_base & 0xe0000000) == KSEG1);
-
-        /* set the function pointers */
-        rtc_mips_get_time = rtc_ds1742_get_time;
-        rtc_mips_set_time = rtc_ds1742_set_time;
-
-        /* clear oscillator stop bit */
-        rtc_write(RTC_READ, RTC_CONTROL);
-        cmos_second = (u8)(rtc_read(RTC_SECONDS) & RTC_SECONDS_MASK);
-        rtc_write(RTC_WRITE, RTC_CONTROL);
-        rtc_write(cmos_second, RTC_SECONDS); /* clear msb */
-        rtc_write(0, RTC_CONTROL);
-}
diff --git a/arch/mips/jmr3927/rbhma3100/setup.c b/arch/mips/jmr3927/rbhma3100/setup.c
index ecabe5b08489..fc523bda068f 100644
--- a/arch/mips/jmr3927/rbhma3100/setup.c
+++ b/arch/mips/jmr3927/rbhma3100/setup.c
@@ -45,6 +45,7 @@
 #include <linux/param.h>        /* for HZ */
 #include <linux/delay.h>
 #include <linux/pm.h>
+#include <linux/platform_device.h>
 #ifdef CONFIG_SERIAL_TXX9
 #include <linux/tty.h>
 #include <linux/serial.h>
@@ -172,19 +173,10 @@ static cycle_t jmr3927_hpt_read(void)
         return jiffies * (JMR3927_TIMER_CLK / HZ) + jmr3927_tmrptr->trr;
 }
 
-#define USE_RTC_DS1742
-#ifdef USE_RTC_DS1742
-extern void rtc_ds1742_init(unsigned long base);
-#endif
 static void __init jmr3927_time_init(void)
 {
         clocksource_mips.read = jmr3927_hpt_read;
         mips_hpt_frequency = JMR3927_TIMER_CLK;
-#ifdef USE_RTC_DS1742
-        if (jmr3927_have_nvram()) {
-                rtc_ds1742_init(JMR3927_IOC_NVRAMB_ADDR);
-        }
-#endif
 }
 
 void __init plat_timer_setup(struct irqaction *irq)
@@ -540,3 +532,32 @@ void __init tx3927_setup(void)
                        printk("TX3927 D-Cache WriteBack (CWF) .\n");
         }
 }
+
+/* This trick makes rtc-ds1742 driver usable as is. */
+unsigned long __swizzle_addr_b(unsigned long port)
+{
+        if ((port & 0xffff0000) != JMR3927_IOC_NVRAMB_ADDR)
+                return port;
+        port = (port & 0xffff0000) | (port & 0x7fff << 1);
+#ifdef __BIG_ENDIAN
+        return port;
+#else
+        return port | 1;
+#endif
+}
+EXPORT_SYMBOL(__swizzle_addr_b);
+
+static int __init jmr3927_rtc_init(void)
+{
+        struct resource res = {
+                .start  = JMR3927_IOC_NVRAMB_ADDR - IO_BASE,
+                .end    = JMR3927_IOC_NVRAMB_ADDR - IO_BASE + 0x800 - 1,
+                .flags  = IORESOURCE_MEM,
+        };
+        struct platform_device *dev;
+        if (!jmr3927_have_nvram())
+                return -ENODEV;
+        dev = platform_device_register_simple("ds1742", -1, &res, 1);
+        return IS_ERR(dev) ? PTR_ERR(dev) : 0;
+}
+device_initcall(jmr3927_rtc_init);