[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>

2 files changed, 15 insertions, 64 deletions

diff --git a/arch/mips/tx4927/toshiba_rbtx4927/toshiba_rbtx4927_irq.c b/arch/mips/tx4927/toshiba_rbtx4927/toshiba_rbtx4927_irq.c
index dcce88f403c9..5cc30c10e746 100644
--- a/arch/mips/tx4927/toshiba_rbtx4927/toshiba_rbtx4927_irq.c
+++ b/arch/mips/tx4927/toshiba_rbtx4927/toshiba_rbtx4927_irq.c
@@ -132,9 +132,6 @@ JP7 is not bus master -- do NOT use -- only 4 pci bus master's allowed -- SouthB
 #include <asm/wbflush.h>
 #include <linux/bootmem.h>
 #include <linux/blkdev.h>
-#ifdef CONFIG_RTC_DS1742
-#include <linux/ds1742rtc.h>
-#endif
 #ifdef CONFIG_TOSHIBA_FPCIB0
 #include <asm/tx4927/smsc_fdc37m81x.h>
 #endif
diff --git a/arch/mips/tx4927/toshiba_rbtx4927/toshiba_rbtx4927_setup.c b/arch/mips/tx4927/toshiba_rbtx4927/toshiba_rbtx4927_setup.c
index 7316a78fdd68..0f7576dfd141 100644
--- a/arch/mips/tx4927/toshiba_rbtx4927/toshiba_rbtx4927_setup.c
+++ b/arch/mips/tx4927/toshiba_rbtx4927/toshiba_rbtx4927_setup.c
@@ -53,6 +53,7 @@
 #include <linux/pci.h>
 #include <linux/timex.h>
 #include <linux/pm.h>
+#include <linux/platform_device.h>
 
 #include <asm/bootinfo.h>
 #include <asm/page.h>
@@ -64,9 +65,6 @@
 #include <asm/time.h>
 #include <linux/bootmem.h>
 #include <linux/blkdev.h>
-#ifdef CONFIG_RTC_DS1742
-#include <linux/ds1742rtc.h>
-#endif
 #ifdef CONFIG_TOSHIBA_FPCIB0
 #include <asm/tx4927/smsc_fdc37m81x.h>
 #endif
@@ -1020,69 +1018,12 @@ void __init toshiba_rbtx4927_setup(void)
                                "+\n");
 }
 
-#ifdef CONFIG_RTC_DS1742
-extern unsigned long rtc_ds1742_get_time(void);
-extern int rtc_ds1742_set_time(unsigned long);
-extern void rtc_ds1742_wait(void);
-#endif
-
 void __init
 toshiba_rbtx4927_time_init(void)
 {
-        u32 c1;
-        u32 c2;
-
         TOSHIBA_RBTX4927_SETUP_DPRINTK(TOSHIBA_RBTX4927_SETUP_TIME_INIT, "-\n");
 
-#ifdef CONFIG_RTC_DS1742
-
-        rtc_mips_get_time = rtc_ds1742_get_time;
-        rtc_mips_set_time = rtc_ds1742_set_time;
-
-        TOSHIBA_RBTX4927_SETUP_DPRINTK(TOSHIBA_RBTX4927_SETUP_TIME_INIT,
-                                       ":rtc_ds1742_init()-\n");
-        rtc_ds1742_init(0xbc010000);
-        TOSHIBA_RBTX4927_SETUP_DPRINTK(TOSHIBA_RBTX4927_SETUP_TIME_INIT,
-                                       ":rtc_ds1742_init()+\n");
-
-        TOSHIBA_RBTX4927_SETUP_DPRINTK(TOSHIBA_RBTX4927_SETUP_TIME_INIT,
-                                       ":Calibrate mips_hpt_frequency-\n");
-        rtc_ds1742_wait();
-
-        /* get the count */
-        c1 = read_c0_count();
-
-        /* wait for the seconds to change again */
-        rtc_ds1742_wait();
-
-        /* get the count again */
-        c2 = read_c0_count();
-
-        TOSHIBA_RBTX4927_SETUP_DPRINTK(TOSHIBA_RBTX4927_SETUP_TIME_INIT,
-                                       ":Calibrate mips_hpt_frequency+\n");
-        TOSHIBA_RBTX4927_SETUP_DPRINTK(TOSHIBA_RBTX4927_SETUP_TIME_INIT,
-                                       ":c1=%12u\n", c1);
-        TOSHIBA_RBTX4927_SETUP_DPRINTK(TOSHIBA_RBTX4927_SETUP_TIME_INIT,
-                                       ":c2=%12u\n", c2);
-
-        /* this diff is as close as we are going to get to counter ticks per sec */
-        mips_hpt_frequency = abs(c2 - c1);
-        TOSHIBA_RBTX4927_SETUP_DPRINTK(TOSHIBA_RBTX4927_SETUP_TIME_INIT,
-                                       ":f1=%12u\n", mips_hpt_frequency);
-
-        /* round to 1/10th of a MHz */
-        mips_hpt_frequency /= (100 * 1000);
-        mips_hpt_frequency *= (100 * 1000);
-        TOSHIBA_RBTX4927_SETUP_DPRINTK(TOSHIBA_RBTX4927_SETUP_TIME_INIT,
-                                       ":f2=%12u\n", mips_hpt_frequency);
-
-        TOSHIBA_RBTX4927_SETUP_DPRINTK(TOSHIBA_RBTX4927_SETUP_INFO,
-                                       ":mips_hpt_frequency=%uHz (%uMHz)\n",
-                                       mips_hpt_frequency,
-                                       mips_hpt_frequency / 1000000);
-#else
-        mips_hpt_frequency = 100000000;
-#endif
+        mips_hpt_frequency = tx4927_cpu_clock / 2;
 
         TOSHIBA_RBTX4927_SETUP_DPRINTK(TOSHIBA_RBTX4927_SETUP_TIME_INIT, "+\n");
 
@@ -1095,3 +1036,16 @@ void __init toshiba_rbtx4927_timer_setup(struct irqaction *irq)
         TOSHIBA_RBTX4927_SETUP_DPRINTK(TOSHIBA_RBTX4927_SETUP_TIMER_SETUP,
                                        "+\n");
 }
+
+static int __init toshiba_rbtx4927_rtc_init(void)
+{
+        struct resource res = {
+                .start  = 0x1c010000,
+                .end    = 0x1c010000 + 0x800 - 1,
+                .flags  = IORESOURCE_MEM,
+        };
+        struct platform_device *dev =
+                platform_device_register_simple("ds1742", -1, &res, 1);
+        return IS_ERR(dev) ? PTR_ERR(dev) : 0;
+}
+device_initcall(toshiba_rbtx4927_rtc_init);