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sparc64: Convert Mostek rtc to use generic RTC layer driver.

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Based largely upon a patch by Krzysztof Helt <krzysztof.h1@poczta.fm>

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2008-08-28 21:06:27 -07:00
parent a0b31b578f
commit 1518e7ed08
3 changed files with 104 additions and 318 deletions
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1
arch/sparc64/Kconfig
View File

@ -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

3
arch/sparc64/kernel/sparc64_ksyms.c
View File

@ -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>
@ -152,8 +151,6 @@ 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);

418
arch/sparc64/kernel/time.c
View File

@ -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[] = {
{
.name = "eeprom",
},
static struct of_device_id rtc_match[] = {
{
.name = "rtc",
},
{},
};
static struct of_platform_driver clock_driver = {
.match_table = clock_match,
.probe = clock_probe,
static struct of_platform_driver rtc_driver = {
.match_table = rtc_match,
.probe = rtc_probe,
.driver = {
.name = "clock",
.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 = "eeprom",
},
{},
};
static struct of_platform_driver mostek_driver = {
.match_table = mostek_match,
.probe = mostek_probe,
.driver = {
.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;