sparc64: Convert Mostek rtc to use generic RTC layer driver.
Based largely upon a patch by Krzysztof Helt <krzysztof.h1@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
---
arch/sparc64/Kconfig | 1 +
arch/sparc64/kernel/sparc64_ksyms.c | 3 -
arch/sparc64/kernel/time.c | 416 +++++++++--------------------------
3 files changed, 103 insertions(+), 317 deletions(-)
diff --git a/arch/sparc64/Kconfig b/arch/sparc64/Kconfig
index 19f0cc8..0a4e342 100644
--- a/arch/sparc64/Kconfig
+++ b/arch/sparc64/Kconfig
@@ -20,6 +20,7 @@ config SPARC64
select HAVE_ARCH_TRACEHOOK
select ARCH_WANT_OPTIONAL_GPIOLIB
select RTC_CLASS
+ select RTC_DRV_M48T59
config GENERIC_TIME
bool
diff --git a/arch/sparc64/kernel/sparc64_ksyms.c b/arch/sparc64/kernel/sparc64_ksyms.c
index 3b2890c..b0a5bc4 100644
--- a/arch/sparc64/kernel/sparc64_ksyms.c
+++ b/arch/sparc64/kernel/sparc64_ksyms.c
@@ -36,7 +36,6 @@
#include <asm/elf.h>
#include <asm/head.h>
#include <asm/smp.h>
-#include <asm/mostek.h>
#include <asm/ptrace.h>
#include <asm/uaccess.h>
#include <asm/checksum.h>
@@ -153,8 +152,6 @@ EXPORT_SYMBOL(flush_dcache_page);
EXPORT_SYMBOL(__flush_dcache_range);
#endif
-EXPORT_SYMBOL(mostek_lock);
-EXPORT_SYMBOL(mstk48t02_regs);
#ifdef CONFIG_SUN_AUXIO
EXPORT_SYMBOL(auxio_set_led);
EXPORT_SYMBOL(auxio_set_lte);
diff --git a/arch/sparc64/kernel/time.c b/arch/sparc64/kernel/time.c
index 184321b..9c2c3d8 100644
--- a/arch/sparc64/kernel/time.c
+++ b/arch/sparc64/kernel/time.c
@@ -30,13 +30,14 @@
#include <linux/percpu.h>
#include <linux/miscdevice.h>
#include <linux/rtc.h>
+#include <linux/rtc/m48t59.h>
#include <linux/kernel_stat.h>
#include <linux/clockchips.h>
#include <linux/clocksource.h>
#include <linux/of_device.h>
+#include <linux/platform_device.h>
#include <asm/oplib.h>
-#include <asm/mostek.h>
#include <asm/timer.h>
#include <asm/irq.h>
#include <asm/io.h>
@@ -50,17 +51,12 @@
#include "entry.h"
-DEFINE_SPINLOCK(mostek_lock);
DEFINE_SPINLOCK(rtc_lock);
-void __iomem *mstk48t02_regs = NULL;
#ifdef CONFIG_PCI
unsigned long ds1287_regs = 0UL;
static void __iomem *bq4802_regs;
#endif
-static void __iomem *mstk48t08_regs;
-static void __iomem *mstk48t59_regs;
-
static int set_rtc_mmss(unsigned long);
#define TICK_PRIV_BIT (1UL << 63)
@@ -413,144 +409,10 @@ int update_persistent_clock(struct timespec now)
return set_rtc_mmss(now.tv_sec);
}
-/* Kick start a stopped clock (procedure from the Sun NVRAM/hostid FAQ). */
-static void __init kick_start_clock(void)
-{
- void __iomem *regs = mstk48t02_regs;
- u8 sec, tmp;
- int i, count;
-
- prom_printf("CLOCK: Clock was stopped. Kick start ");
-
- spin_lock_irq(&mostek_lock);
-
- /* Turn on the kick start bit to start the oscillator. */
- tmp = mostek_read(regs + MOSTEK_CREG);
- tmp |= MSTK_CREG_WRITE;
- mostek_write(regs + MOSTEK_CREG, tmp);
- tmp = mostek_read(regs + MOSTEK_SEC);
- tmp &= ~MSTK_STOP;
- mostek_write(regs + MOSTEK_SEC, tmp);
- tmp = mostek_read(regs + MOSTEK_HOUR);
- tmp |= MSTK_KICK_START;
- mostek_write(regs + MOSTEK_HOUR, tmp);
- tmp = mostek_read(regs + MOSTEK_CREG);
- tmp &= ~MSTK_CREG_WRITE;
- mostek_write(regs + MOSTEK_CREG, tmp);
-
- spin_unlock_irq(&mostek_lock);
-
- /* Delay to allow the clock oscillator to start. */
- sec = MSTK_REG_SEC(regs);
- for (i = 0; i < 3; i++) {
- while (sec == MSTK_REG_SEC(regs))
- for (count = 0; count < 100000; count++)
- /* nothing */ ;
- prom_printf(".");
- sec = MSTK_REG_SEC(regs);
- }
- prom_printf("\n");
-
- spin_lock_irq(&mostek_lock);
-
- /* Turn off kick start and set a "valid" time and date. */
- tmp = mostek_read(regs + MOSTEK_CREG);
- tmp |= MSTK_CREG_WRITE;
- mostek_write(regs + MOSTEK_CREG, tmp);
- tmp = mostek_read(regs + MOSTEK_HOUR);
- tmp &= ~MSTK_KICK_START;
- mostek_write(regs + MOSTEK_HOUR, tmp);
- MSTK_SET_REG_SEC(regs,0);
- MSTK_SET_REG_MIN(regs,0);
- MSTK_SET_REG_HOUR(regs,0);
- MSTK_SET_REG_DOW(regs,5);
- MSTK_SET_REG_DOM(regs,1);
- MSTK_SET_REG_MONTH(regs,8);
- MSTK_SET_REG_YEAR(regs,1996 - MSTK_YEAR_ZERO);
- tmp = mostek_read(regs + MOSTEK_CREG);
- tmp &= ~MSTK_CREG_WRITE;
- mostek_write(regs + MOSTEK_CREG, tmp);
-
- spin_unlock_irq(&mostek_lock);
-
- /* Ensure the kick start bit is off. If it isn't, turn it off. */
- while (mostek_read(regs + MOSTEK_HOUR) & MSTK_KICK_START) {
- prom_printf("CLOCK: Kick start still on!\n");
-
- spin_lock_irq(&mostek_lock);
-
- tmp = mostek_read(regs + MOSTEK_CREG);
- tmp |= MSTK_CREG_WRITE;
- mostek_write(regs + MOSTEK_CREG, tmp);
-
- tmp = mostek_read(regs + MOSTEK_HOUR);
- tmp &= ~MSTK_KICK_START;
- mostek_write(regs + MOSTEK_HOUR, tmp);
-
- tmp = mostek_read(regs + MOSTEK_CREG);
- tmp &= ~MSTK_CREG_WRITE;
- mostek_write(regs + MOSTEK_CREG, tmp);
-
- spin_unlock_irq(&mostek_lock);
- }
-
- prom_printf("CLOCK: Kick start procedure successful.\n");
-}
-
-/* Return nonzero if the clock chip battery is low. */
-static int __init has_low_battery(void)
-{
- void __iomem *regs = mstk48t02_regs;
- u8 data1, data2;
-
- spin_lock_irq(&mostek_lock);
-
- data1 = mostek_read(regs + MOSTEK_EEPROM); /* Read some data. */
- mostek_write(regs + MOSTEK_EEPROM, ~data1); /* Write back the complement. */
- data2 = mostek_read(regs + MOSTEK_EEPROM); /* Read back the complement. */
- mostek_write(regs + MOSTEK_EEPROM, data1); /* Restore original value. */
-
- spin_unlock_irq(&mostek_lock);
-
- return (data1 == data2); /* Was the write blocked? */
-}
-
-static void __init mostek_set_system_time(void __iomem *mregs)
-{
- unsigned int year, mon, day, hour, min, sec;
- u8 tmp;
-
- spin_lock_irq(&mostek_lock);
-
- /* Traditional Mostek chip. */
- tmp = mostek_read(mregs + MOSTEK_CREG);
- tmp |= MSTK_CREG_READ;
- mostek_write(mregs + MOSTEK_CREG, tmp);
-
- sec = MSTK_REG_SEC(mregs);
- min = MSTK_REG_MIN(mregs);
- hour = MSTK_REG_HOUR(mregs);
- day = MSTK_REG_DOM(mregs);
- mon = MSTK_REG_MONTH(mregs);
- year = MSTK_CVT_YEAR( MSTK_REG_YEAR(mregs) );
-
- xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
- xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
- set_normalized_timespec(&wall_to_monotonic,
- -xtime.tv_sec, -xtime.tv_nsec);
-
- tmp = mostek_read(mregs + MOSTEK_CREG);
- tmp &= ~MSTK_CREG_READ;
- mostek_write(mregs + MOSTEK_CREG, tmp);
-
- spin_unlock_irq(&mostek_lock);
-}
-
/* Probe for the real time clock chip. */
static void __init set_system_time(void)
{
unsigned int year, mon, day, hour, min, sec;
- void __iomem *mregs = mstk48t02_regs;
#ifdef CONFIG_PCI
unsigned long dregs = ds1287_regs;
void __iomem *bregs = bq4802_regs;
@@ -559,16 +421,11 @@ static void __init set_system_time(void)
void __iomem *bregs = 0UL;
#endif
- if (!mregs && !dregs && !bregs) {
+ if (!dregs && !bregs) {
prom_printf("Something wrong, clock regs not mapped yet.\n");
prom_halt();
}
- if (mregs) {
- mostek_set_system_time(mregs);
- return;
- }
-
if (bregs) {
unsigned char val = readb(bregs + 0x0e);
unsigned int century;
@@ -689,12 +546,9 @@ retry:
return -EOPNOTSUPP;
}
-static int __init clock_model_matches(const char *model)
+static int __init rtc_model_matches(const char *model)
{
- if (strcmp(model, "mk48t02") &&
- strcmp(model, "mk48t08") &&
- strcmp(model, "mk48t59") &&
- strcmp(model, "m5819") &&
+ if (strcmp(model, "m5819") &&
strcmp(model, "m5819p") &&
strcmp(model, "m5823") &&
strcmp(model, "ds1287") &&
@@ -704,7 +558,7 @@ static int __init clock_model_matches(const char *model)
return 1;
}
-static int __devinit clock_probe(struct of_device *op, const struct of_device_id *match)
+static int __devinit rtc_probe(struct of_device *op, const struct of_device_id *match)
{
struct device_node *dp = op->node;
const char *model = of_get_property(dp, "model", NULL);
@@ -715,14 +569,7 @@ static int __devinit clock_probe(struct of_device *op, const struct of_device_id
if (!model)
model = compat;
- if (!model || !clock_model_matches(model))
- return -ENODEV;
-
- /* On an Enterprise system there can be multiple mostek clocks.
- * We should only match the one that is on the central FHC bus.
- */
- if (!strcmp(dp->parent->name, "fhc") &&
- strcmp(dp->parent->parent->name, "central") != 0)
+ if (!model || !rtc_model_matches(model))
return -ENODEV;
size = (op->resource[0].end - op->resource[0].start) + 1;
@@ -738,32 +585,12 @@ static int __devinit clock_probe(struct of_device *op, const struct of_device_id
ds1287_regs = (unsigned long) regs;
} else if (!strcmp(model, "bq4802")) {
bq4802_regs = regs;
- } else
-#endif
- if (model[5] == '0' && model[6] == '2') {
- mstk48t02_regs = regs;
- } else if(model[5] == '0' && model[6] == '8') {
- mstk48t08_regs = regs;
- mstk48t02_regs = mstk48t08_regs + MOSTEK_48T08_48T02;
- } else {
- mstk48t59_regs = regs;
- mstk48t02_regs = mstk48t59_regs + MOSTEK_48T59_48T02;
}
-
+#endif
printk(KERN_INFO "%s: Clock regs at %p\n", dp->full_name, regs);
local_irq_save(flags);
- if (mstk48t02_regs != NULL) {
- /* Report a low battery voltage condition. */
- if (has_low_battery())
- prom_printf("NVRAM: Low battery voltage!\n");
-
- /* Kick start the clock if it is completely stopped. */
- if (mostek_read(mstk48t02_regs + MOSTEK_SEC) & MSTK_STOP)
- kick_start_clock();
- }
-
set_system_time();
local_irq_restore(flags);
@@ -771,21 +598,102 @@ static int __devinit clock_probe(struct of_device *op, const struct of_device_id
return 0;
}
-static struct of_device_id clock_match[] = {
+static struct of_device_id rtc_match[] = {
{
- .name = "eeprom",
+ .name = "rtc",
+ },
+ {},
+};
+
+static struct of_platform_driver rtc_driver = {
+ .match_table = rtc_match,
+ .probe = rtc_probe,
+ .driver = {
+ .name = "rtc",
},
+};
+
+static unsigned char mostek_read_byte(struct device *dev, u32 ofs)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ void __iomem *regs;
+ unsigned char val;
+
+ regs = (void __iomem *) pdev->resource[0].start;
+ val = readb(regs + ofs);
+
+ /* the year 0 is 1968 */
+ if (ofs == M48T59_YEAR) {
+ val += 0x68;
+ if ((val & 0xf) > 9)
+ val += 6;
+ }
+ return val;
+}
+
+static void mostek_write_byte(struct device *dev, u32 ofs, u8 val)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ void __iomem *regs;
+
+ regs = (void __iomem *) pdev->resource[0].start;
+ if (ofs == M48T59_YEAR) {
+ if (val < 0x68)
+ val += 0x32;
+ else
+ val -= 0x68;
+ if ((val & 0xf) > 9)
+ val += 6;
+ if ((val & 0xf0) > 0x9A)
+ val += 0x60;
+ }
+ writeb(val, regs + ofs);
+}
+
+static struct m48t59_plat_data m48t59_data = {
+ .read_byte = mostek_read_byte,
+ .write_byte = mostek_write_byte,
+};
+
+static struct platform_device m48t59_rtc = {
+ .name = "rtc-m48t59",
+ .id = 0,
+ .num_resources = 1,
+ .dev = {
+ .platform_data = &m48t59_data,
+ },
+};
+
+static int __devinit mostek_probe(struct of_device *op, const struct of_device_id *match)
+{
+ struct device_node *dp = op->node;
+
+ /* On an Enterprise system there can be multiple mostek clocks.
+ * We should only match the one that is on the central FHC bus.
+ */
+ if (!strcmp(dp->parent->name, "fhc") &&
+ strcmp(dp->parent->parent->name, "central") != 0)
+ return -ENODEV;
+
+ printk(KERN_INFO "%s: Mostek regs at 0x%lx\n",
+ dp->full_name, op->resource[0].start);
+
+ m48t59_rtc.resource = &op->resource[0];
+ return platform_device_register(&m48t59_rtc);
+}
+
+static struct of_device_id mostek_match[] = {
{
- .name = "rtc",
+ .name = "eeprom",
},
{},
};
-static struct of_platform_driver clock_driver = {
- .match_table = clock_match,
- .probe = clock_probe,
+static struct of_platform_driver mostek_driver = {
+ .match_table = mostek_match,
+ .probe = mostek_probe,
.driver = {
- .name = "clock",
+ .name = "mostek",
},
};
@@ -806,7 +714,10 @@ static int __init clock_init(void)
return 0;
}
- return of_register_driver(&clock_driver, &of_platform_bus_type);
+ (void) of_register_driver(&rtc_driver, &of_platform_bus_type);
+ (void) of_register_driver(&mostek_driver, &of_platform_bus_type);
+
+ return 0;
}
/* Must be after subsys_initcall() so that busses are probed. Must
@@ -1078,7 +989,6 @@ unsigned long long sched_clock(void)
static int set_rtc_mmss(unsigned long nowtime)
{
int real_seconds, real_minutes, chip_minutes;
- void __iomem *mregs = mstk48t02_regs;
#ifdef CONFIG_PCI
unsigned long dregs = ds1287_regs;
void __iomem *bregs = bq4802_regs;
@@ -1087,62 +997,15 @@ static int set_rtc_mmss(unsigned long nowtime)
void __iomem *bregs = 0UL;
#endif
unsigned long flags;
- u8 tmp;
/*
* Not having a register set can lead to trouble.
* Also starfire doesn't have a tod clock.
*/
- if (!mregs && !dregs && !bregs)
+ if (!dregs && !bregs)
return -1;
- if (mregs) {
- spin_lock_irqsave(&mostek_lock, flags);
-
- /* Read the current RTC minutes. */
- tmp = mostek_read(mregs + MOSTEK_CREG);
- tmp |= MSTK_CREG_READ;
- mostek_write(mregs + MOSTEK_CREG, tmp);
-
- chip_minutes = MSTK_REG_MIN(mregs);
-
- tmp = mostek_read(mregs + MOSTEK_CREG);
- tmp &= ~MSTK_CREG_READ;
- mostek_write(mregs + MOSTEK_CREG, tmp);
-
- /*
- * since we're only adjusting minutes and seconds,
- * don't interfere with hour overflow. This avoids
- * messing with unknown time zones but requires your
- * RTC not to be off by more than 15 minutes
- */
- real_seconds = nowtime % 60;
- real_minutes = nowtime / 60;
- if (((abs(real_minutes - chip_minutes) + 15)/30) & 1)
- real_minutes += 30; /* correct for half hour time zone */
- real_minutes %= 60;
-
- if (abs(real_minutes - chip_minutes) < 30) {
- tmp = mostek_read(mregs + MOSTEK_CREG);
- tmp |= MSTK_CREG_WRITE;
- mostek_write(mregs + MOSTEK_CREG, tmp);
-
- MSTK_SET_REG_SEC(mregs,real_seconds);
- MSTK_SET_REG_MIN(mregs,real_minutes);
-
- tmp = mostek_read(mregs + MOSTEK_CREG);
- tmp &= ~MSTK_CREG_WRITE;
- mostek_write(mregs + MOSTEK_CREG, tmp);
-
- spin_unlock_irqrestore(&mostek_lock, flags);
-
- return 0;
- } else {
- spin_unlock_irqrestore(&mostek_lock, flags);
-
- return -1;
- }
- } else if (bregs) {
+ if (bregs) {
int retval = 0;
unsigned char val = readb(bregs + 0x0e);
@@ -1485,74 +1348,6 @@ static int cmos_set_rtc_time(struct rtc_time *rtc_tm)
}
#endif /* CONFIG_PCI */
-static void mostek_get_rtc_time(struct rtc_time *rtc_tm)
-{
- void __iomem *regs = mstk48t02_regs;
- u8 tmp;
-
- spin_lock_irq(&mostek_lock);
-
- tmp = mostek_read(regs + MOSTEK_CREG);
- tmp |= MSTK_CREG_READ;
- mostek_write(regs + MOSTEK_CREG, tmp);
-
- rtc_tm->tm_sec = MSTK_REG_SEC(regs);
- rtc_tm->tm_min = MSTK_REG_MIN(regs);
- rtc_tm->tm_hour = MSTK_REG_HOUR(regs);
- rtc_tm->tm_mday = MSTK_REG_DOM(regs);
- rtc_tm->tm_mon = MSTK_REG_MONTH(regs);
- rtc_tm->tm_year = MSTK_CVT_YEAR( MSTK_REG_YEAR(regs) );
- rtc_tm->tm_wday = MSTK_REG_DOW(regs);
-
- tmp = mostek_read(regs + MOSTEK_CREG);
- tmp &= ~MSTK_CREG_READ;
- mostek_write(regs + MOSTEK_CREG, tmp);
-
- spin_unlock_irq(&mostek_lock);
-
- rtc_tm->tm_mon--;
- rtc_tm->tm_wday--;
- rtc_tm->tm_year -= 1900;
-}
-
-static int mostek_set_rtc_time(struct rtc_time *rtc_tm)
-{
- unsigned char mon, day, hrs, min, sec, wday;
- void __iomem *regs = mstk48t02_regs;
- unsigned int yrs;
- u8 tmp;
-
- yrs = rtc_tm->tm_year + 1900;
- mon = rtc_tm->tm_mon + 1;
- day = rtc_tm->tm_mday;
- wday = rtc_tm->tm_wday + 1;
- hrs = rtc_tm->tm_hour;
- min = rtc_tm->tm_min;
- sec = rtc_tm->tm_sec;
-
- spin_lock_irq(&mostek_lock);
-
- tmp = mostek_read(regs + MOSTEK_CREG);
- tmp |= MSTK_CREG_WRITE;
- mostek_write(regs + MOSTEK_CREG, tmp);
-
- MSTK_SET_REG_SEC(regs, sec);
- MSTK_SET_REG_MIN(regs, min);
- MSTK_SET_REG_HOUR(regs, hrs);
- MSTK_SET_REG_DOW(regs, wday);
- MSTK_SET_REG_DOM(regs, day);
- MSTK_SET_REG_MONTH(regs, mon);
- MSTK_SET_REG_YEAR(regs, yrs - MSTK_YEAR_ZERO);
-
- tmp = mostek_read(regs + MOSTEK_CREG);
- tmp &= ~MSTK_CREG_WRITE;
- mostek_write(regs + MOSTEK_CREG, tmp);
-
- spin_unlock_irq(&mostek_lock);
-
- return 0;
-}
-
struct mini_rtc_ops {
void (*get_rtc_time)(struct rtc_time *);
int (*set_rtc_time)(struct rtc_time *);
@@ -1580,11 +1375,6 @@ static struct mini_rtc_ops cmos_rtc_ops = {
};
#endif /* CONFIG_PCI */
-static struct mini_rtc_ops mostek_rtc_ops = {
- .get_rtc_time = mostek_get_rtc_time,
- .set_rtc_time = mostek_set_rtc_time,
-};
-
static struct mini_rtc_ops *mini_rtc_ops;
static inline void mini_get_rtc_time(struct rtc_time *time)
@@ -1717,8 +1507,6 @@ static int __init rtc_mini_init(void)
else if (ds1287_regs)
mini_rtc_ops = &cmos_rtc_ops;
#endif /* CONFIG_PCI */
- else if (mstk48t02_regs)
- mini_rtc_ops = &mostek_rtc_ops;
else
return -ENODEV;
--
1.5.6.5.GIT
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