m68k: mvme147, mvme16x: Adopt rtc-m48t59 platform driver

Both mvme147 and mvme16x platforms have their own RTC driver
implementations that duplicate functionality provided by the rtc-m48t59
driver. Adopt the rtc-m48t59 driver and remove the other ones.

Tested-by: Daniel Palmer <daniel@0x0f.com>
Signed-off-by: Finn Thain <fthain@linux-m68k.org>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/19a16bcc94c42ea9c5397b37b1918c2937e3faab.1731450735.git.fthain@linux-m68k.org
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Author: fthain

arch/m68k/configs/multi_defconfig

@@ -503,6 +503,7 @@ CONFIG_UHID=m
 # CONFIG_USB_SUPPORT is not set
 CONFIG_RTC_CLASS=y
 # CONFIG_RTC_NVMEM is not set
+CONFIG_RTC_DRV_M48T59=m
 CONFIG_RTC_DRV_MSM6242=m
 CONFIG_RTC_DRV_RP5C01=m
 CONFIG_RTC_DRV_GENERIC=m

arch/m68k/configs/mvme147_defconfig

@@ -391,6 +391,7 @@ CONFIG_UHID=m
 # CONFIG_USB_SUPPORT is not set
 CONFIG_RTC_CLASS=y
 # CONFIG_RTC_NVMEM is not set
+CONFIG_RTC_DRV_M48T59=y
 CONFIG_RTC_DRV_GENERIC=m
 # CONFIG_VIRTIO_MENU is not set
 # CONFIG_VHOST_MENU is not set

arch/m68k/configs/mvme16x_defconfig

@@ -392,6 +392,7 @@ CONFIG_UHID=m
 # CONFIG_USB_SUPPORT is not set
 CONFIG_RTC_CLASS=y
 # CONFIG_RTC_NVMEM is not set
+CONFIG_RTC_DRV_M48T59=y
 CONFIG_RTC_DRV_GENERIC=m
 # CONFIG_VIRTIO_MENU is not set
 # CONFIG_VHOST_MENU is not set

arch/m68k/include/asm/mvme147hw.h

@@ -4,24 +4,7 @@
 
 #include <asm/irq.h>
 
-typedef struct {
-	unsigned char
-		ctrl,
-		bcd_sec,
-		bcd_min,
-		bcd_hr,
-		bcd_dow,
-		bcd_dom,
-		bcd_mth,
-		bcd_year;
-} MK48T02;
-
-#define RTC_WRITE	0x80
-#define RTC_READ	0x40
-#define RTC_STOP	0x20
-
-#define m147_rtc ((MK48T02 * volatile)0xfffe07f8)
-
+#define MVME147_RTC_BASE	0xfffe0000
 
 struct pcc_regs {
    volatile u_long	dma_tadr;

arch/m68k/include/asm/mvme16xhw.h

@@ -24,23 +24,7 @@ typedef struct {
 
 #define mvmelp   ((*(volatile MVMElpPtr)(MVME_LPR_BASE)))
 
-typedef struct {
-	unsigned char
-		ctrl,
-		bcd_sec,
-		bcd_min,
-		bcd_hr,
-		bcd_dow,
-		bcd_dom,
-		bcd_mth,
-		bcd_year;
-} MK48T08_t, *MK48T08ptr_t;
-
-#define RTC_WRITE	0x80
-#define RTC_READ	0x40
-#define RTC_STOP	0x20
-
-#define MVME_RTC_BASE	0xfffc1ff8
+#define MVME_RTC_BASE	0xfffc0000
 
 #define MVME_I596_BASE	0xfff46000
 

arch/m68k/mvme147/config.c

@@ -19,8 +19,9 @@
 #include <linux/linkage.h>
 #include <linux/init.h>
 #include <linux/major.h>
-#include <linux/rtc.h>
 #include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/rtc/m48t59.h>
 
 #include <asm/bootinfo.h>
 #include <asm/bootinfo-vme.h>
@@ -35,13 +36,9 @@
 
 static void mvme147_get_model(char *model);
 extern void mvme147_sched_init(void);
-extern int mvme147_hwclk (int, struct rtc_time *);
 extern void mvme147_reset (void);
 
 
-static int bcd2int (unsigned char b);
-
-
 int __init mvme147_parse_bootinfo(const struct bi_record *bi)
 {
 	uint16_t tag = be16_to_cpu(bi->tag);
@@ -79,7 +76,6 @@ void __init config_mvme147(void)
 {
 	mach_sched_init		= mvme147_sched_init;
 	mach_init_IRQ		= mvme147_init_IRQ;
-	mach_hwclk		= mvme147_hwclk;
 	mach_reset		= mvme147_reset;
 	mach_get_model		= mvme147_get_model;
 
@@ -88,6 +84,28 @@ void __init config_mvme147(void)
 		vme_brdtype = VME_TYPE_MVME147;
 }
 
+static struct resource m48t59_rsrc[] = {
+	DEFINE_RES_MEM(MVME147_RTC_BASE, 0x800),
+};
+
+static struct m48t59_plat_data m48t59_data = {
+	.type = M48T59RTC_TYPE_M48T02,
+	.yy_offset = 70,
+};
+
+static int __init mvme147_platform_init(void)
+{
+	if (!MACH_IS_MVME147)
+		return 0;
+
+	platform_device_register_resndata(NULL, "rtc-m48t59", -1,
+					  m48t59_rsrc, ARRAY_SIZE(m48t59_rsrc),
+					  &m48t59_data, sizeof(m48t59_data));
+	return 0;
+}
+
+arch_initcall(mvme147_platform_init);
+
 static u64 mvme147_read_clk(struct clocksource *cs);
 
 static struct clocksource mvme147_clk = {
@@ -161,27 +179,3 @@ static u64 mvme147_read_clk(struct clocksource *cs)
 	return ticks;
 }
 
-static int bcd2int (unsigned char b)
-{
-	return ((b>>4)*10 + (b&15));
-}
-
-int mvme147_hwclk(int op, struct rtc_time *t)
-{
-	if (!op) {
-		m147_rtc->ctrl = RTC_READ;
-		t->tm_year = bcd2int (m147_rtc->bcd_year);
-		t->tm_mon  = bcd2int(m147_rtc->bcd_mth) - 1;
-		t->tm_mday = bcd2int (m147_rtc->bcd_dom);
-		t->tm_hour = bcd2int (m147_rtc->bcd_hr);
-		t->tm_min  = bcd2int (m147_rtc->bcd_min);
-		t->tm_sec  = bcd2int (m147_rtc->bcd_sec);
-		m147_rtc->ctrl = 0;
-		if (t->tm_year < 70)
-			t->tm_year += 100;
-	} else {
-		/* FIXME Setting the time is not yet supported */
-		return -EOPNOTSUPP;
-	}
-	return 0;
-}

arch/m68k/mvme16x/Makefile

@@ -3,4 +3,4 @@
 # Makefile for Linux arch/m68k/mvme16x source directory
 #
 
-obj-y		:= config.o rtc.o
+obj-y		:= config.o

arch/m68k/mvme16x/config.c

@@ -21,9 +21,10 @@
 #include <linux/linkage.h>
 #include <linux/init.h>
 #include <linux/major.h>
-#include <linux/rtc.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/rtc/m48t59.h>
 
 #include <asm/bootinfo.h>
 #include <asm/bootinfo-vme.h>
@@ -39,16 +40,10 @@
 
 extern t_bdid mvme_bdid;
 
-static MK48T08ptr_t volatile rtc = (MK48T08ptr_t)MVME_RTC_BASE;
-
 static void mvme16x_get_model(char *model);
 extern void mvme16x_sched_init(void);
-extern int mvme16x_hwclk (int, struct rtc_time *);
 extern void mvme16x_reset (void);
 
-int bcd2int (unsigned char b);
-
-
 unsigned short mvme16x_config;
 EXPORT_SYMBOL(mvme16x_config);
 
@@ -268,7 +263,6 @@ void __init config_mvme16x(void)
 
     mach_sched_init      = mvme16x_sched_init;
     mach_init_IRQ        = mvme16x_init_IRQ;
-    mach_hwclk           = mvme16x_hwclk;
     mach_reset		 = mvme16x_reset;
     mach_get_model       = mvme16x_get_model;
     mach_get_hardware_list = mvme16x_get_hardware_list;
@@ -312,6 +306,28 @@ void __init config_mvme16x(void)
     }
 }
 
+static struct resource m48t59_rsrc[] = {
+	DEFINE_RES_MEM(MVME_RTC_BASE, 0x2000),
+};
+
+static struct m48t59_plat_data m48t59_data = {
+	.type = M48T59RTC_TYPE_M48T08,
+	.yy_offset = 70,
+};
+
+static int __init mvme16x_platform_init(void)
+{
+	if (!MACH_IS_MVME16x)
+		return 0;
+
+	platform_device_register_resndata(NULL, "rtc-m48t59", -1,
+					  m48t59_rsrc, ARRAY_SIZE(m48t59_rsrc),
+					  &m48t59_data, sizeof(m48t59_data));
+	return 0;
+}
+
+arch_initcall(mvme16x_platform_init);
+
 static irqreturn_t mvme16x_abort_int (int irq, void *dev_id)
 {
 	unsigned long *new = (unsigned long *)vectors;
@@ -426,28 +442,3 @@ static u64 mvme16x_read_clk(struct clocksource *cs)
 
 	return ticks;
 }
-
-int bcd2int (unsigned char b)
-{
-	return ((b>>4)*10 + (b&15));
-}
-
-int mvme16x_hwclk(int op, struct rtc_time *t)
-{
-	if (!op) {
-		rtc->ctrl = RTC_READ;
-		t->tm_year = bcd2int (rtc->bcd_year);
-		t->tm_mon  = bcd2int(rtc->bcd_mth) - 1;
-		t->tm_mday = bcd2int (rtc->bcd_dom);
-		t->tm_hour = bcd2int (rtc->bcd_hr);
-		t->tm_min  = bcd2int (rtc->bcd_min);
-		t->tm_sec  = bcd2int (rtc->bcd_sec);
-		rtc->ctrl = 0;
-		if (t->tm_year < 70)
-			t->tm_year += 100;
-	} else {
-		/* FIXME Setting the time is not yet supported */
-		return -EOPNOTSUPP;
-	}
-	return 0;
-}