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[SPARC64]: Add support for bq4802 TOD chip, as found on ultra45.
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Signed-off-by: David S. Miller <davem@davemloft.net>
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David S. Miller committed May 12, 2007
1 parent 95d71e6 commit d037e05
Showing 1 changed file with 210 additions and 20 deletions.
230 changes: 210 additions & 20 deletions arch/sparc64/kernel/time.c
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Original file line number Diff line number Diff line change
Expand Up @@ -55,6 +55,7 @@ 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;
Expand Down Expand Up @@ -565,12 +566,14 @@ static void __init set_system_time(void)
void __iomem *mregs = mstk48t02_regs;
#ifdef CONFIG_PCI
unsigned long dregs = ds1287_regs;
void __iomem *bregs = bq4802_regs;
#else
unsigned long dregs = 0UL;
void __iomem *bregs = 0UL;
#endif
u8 tmp;

if (!mregs && !dregs) {
if (!mregs && !dregs && !bregs) {
prom_printf("Something wrong, clock regs not mapped yet.\n");
prom_halt();
}
Expand All @@ -589,6 +592,33 @@ static void __init set_system_time(void)
day = MSTK_REG_DOM(mregs);
mon = MSTK_REG_MONTH(mregs);
year = MSTK_CVT_YEAR( MSTK_REG_YEAR(mregs) );
} else if (bregs) {
unsigned char val = readb(bregs + 0x0e);
unsigned int century;

/* BQ4802 RTC chip. */

writeb(val | 0x08, bregs + 0x0e);

sec = readb(bregs + 0x00);
min = readb(bregs + 0x02);
hour = readb(bregs + 0x04);
day = readb(bregs + 0x06);
mon = readb(bregs + 0x09);
year = readb(bregs + 0x0a);
century = readb(bregs + 0x0f);

writeb(val, bregs + 0x0e);

BCD_TO_BIN(sec);
BCD_TO_BIN(min);
BCD_TO_BIN(hour);
BCD_TO_BIN(day);
BCD_TO_BIN(mon);
BCD_TO_BIN(year);
BCD_TO_BIN(century);

year += (century * 100);
} else {
/* Dallas 12887 RTC chip. */

Expand Down Expand Up @@ -712,7 +742,8 @@ static int __init clock_model_matches(const char *model)
strcmp(model, "m5819") &&
strcmp(model, "m5819p") &&
strcmp(model, "m5823") &&
strcmp(model, "ds1287"))
strcmp(model, "ds1287") &&
strcmp(model, "bq4802"))
return 0;

return 1;
Expand All @@ -722,9 +753,13 @@ static int __devinit clock_probe(struct of_device *op, const struct of_device_id
{
struct device_node *dp = op->node;
const char *model = of_get_property(dp, "model", NULL);
const char *compat = of_get_property(dp, "compatible", NULL);
unsigned long size, flags;
void __iomem *regs;

if (!model)
model = compat;

if (!model || !clock_model_matches(model))
return -ENODEV;

Expand All @@ -746,6 +781,8 @@ static int __devinit clock_probe(struct of_device *op, const struct of_device_id
!strcmp(model, "m5819p") ||
!strcmp(model, "m5823")) {
ds1287_regs = (unsigned long) regs;
} else if (!strcmp(model, "bq4802")) {
bq4802_regs = regs;
} else
#endif
if (model[5] == '0' && model[6] == '2') {
Expand Down Expand Up @@ -1070,8 +1107,10 @@ static int set_rtc_mmss(unsigned long nowtime)
void __iomem *mregs = mstk48t02_regs;
#ifdef CONFIG_PCI
unsigned long dregs = ds1287_regs;
void __iomem *bregs = bq4802_regs;
#else
unsigned long dregs = 0UL;
void __iomem *bregs = 0UL;
#endif
unsigned long flags;
u8 tmp;
Expand All @@ -1080,7 +1119,7 @@ static int set_rtc_mmss(unsigned long nowtime)
* Not having a register set can lead to trouble.
* Also starfire doesn't have a tod clock.
*/
if (!mregs && !dregs)
if (!mregs && !dregs & !bregs)
return -1;

if (mregs) {
Expand Down Expand Up @@ -1129,6 +1168,37 @@ static int set_rtc_mmss(unsigned long nowtime)

return -1;
}
} else if (bregs) {
int retval = 0;
unsigned char val = readb(bregs + 0x0e);

/* BQ4802 RTC chip. */

writeb(val | 0x08, bregs + 0x0e);

chip_minutes = readb(bregs + 0x02);
BCD_TO_BIN(chip_minutes);
real_seconds = nowtime % 60;
real_minutes = nowtime / 60;
if (((abs(real_minutes - chip_minutes) + 15)/30) & 1)
real_minutes += 30;
real_minutes %= 60;

if (abs(real_minutes - chip_minutes) < 30) {
BIN_TO_BCD(real_seconds);
BIN_TO_BCD(real_minutes);
writeb(real_seconds, bregs + 0x00);
writeb(real_minutes, bregs + 0x02);
} else {
printk(KERN_WARNING
"set_rtc_mmss: can't update from %d to %d\n",
chip_minutes, real_minutes);
retval = -1;
}

writeb(val, bregs + 0x0e);

return retval;
} else {
int retval = 0;
unsigned char save_control, save_freq_select;
Expand Down Expand Up @@ -1259,38 +1329,152 @@ static void to_tm(int tim, struct rtc_time *tm)
/* Both Starfire and SUN4V give us seconds since Jan 1st, 1970,
* aka Unix time. So we have to convert to/from rtc_time.
*/
static inline void mini_get_rtc_time(struct rtc_time *time)
static void starfire_get_rtc_time(struct rtc_time *time)
{
unsigned long flags;
u32 seconds;
u32 seconds = starfire_get_time();

spin_lock_irqsave(&rtc_lock, flags);
seconds = 0;
if (this_is_starfire)
seconds = starfire_get_time();
else if (tlb_type == hypervisor)
seconds = hypervisor_get_time();
spin_unlock_irqrestore(&rtc_lock, flags);
to_tm(seconds, time);
time->tm_year -= 1900;
time->tm_mon -= 1;
}

static int starfire_set_rtc_time(struct rtc_time *time)
{
u32 seconds = mktime(time->tm_year + 1900, time->tm_mon + 1,
time->tm_mday, time->tm_hour,
time->tm_min, time->tm_sec);

return starfire_set_time(seconds);
}

static void hypervisor_get_rtc_time(struct rtc_time *time)
{
u32 seconds = hypervisor_get_time();

to_tm(seconds, time);
time->tm_year -= 1900;
time->tm_mon -= 1;
}

static inline int mini_set_rtc_time(struct rtc_time *time)
static int hypervisor_set_rtc_time(struct rtc_time *time)
{
u32 seconds = mktime(time->tm_year + 1900, time->tm_mon + 1,
time->tm_mday, time->tm_hour,
time->tm_min, time->tm_sec);

return hypervisor_set_time(seconds);
}

static void bq4802_get_rtc_time(struct rtc_time *time)
{
unsigned char val = readb(bq4802_regs + 0x0e);
unsigned int century;

writeb(val | 0x08, bq4802_regs + 0x0e);

time->tm_sec = readb(bq4802_regs + 0x00);
time->tm_min = readb(bq4802_regs + 0x02);
time->tm_hour = readb(bq4802_regs + 0x04);
time->tm_mday = readb(bq4802_regs + 0x06);
time->tm_mon = readb(bq4802_regs + 0x09);
time->tm_year = readb(bq4802_regs + 0x0a);
time->tm_wday = readb(bq4802_regs + 0x08);
century = readb(bq4802_regs + 0x0f);

writeb(val, bq4802_regs + 0x0e);

BCD_TO_BIN(time->tm_sec);
BCD_TO_BIN(time->tm_min);
BCD_TO_BIN(time->tm_hour);
BCD_TO_BIN(time->tm_mday);
BCD_TO_BIN(time->tm_mon);
BCD_TO_BIN(time->tm_year);
BCD_TO_BIN(time->tm_wday);
BCD_TO_BIN(century);

time->tm_year += (century * 100);
time->tm_year -= 1900;

time->tm_mon--;
}

static int bq4802_set_rtc_time(struct rtc_time *time)
{
unsigned char val = readb(bq4802_regs + 0x0e);
unsigned char sec, min, hrs, day, mon, yrs, century;
unsigned int year;

year = time->tm_year + 1900;
century = year / 100;
yrs = year % 100;

mon = time->tm_mon + 1; /* tm_mon starts at zero */
day = time->tm_mday;
hrs = time->tm_hour;
min = time->tm_min;
sec = time->tm_sec;

BIN_TO_BCD(sec);
BIN_TO_BCD(min);
BIN_TO_BCD(hrs);
BIN_TO_BCD(day);
BIN_TO_BCD(mon);
BIN_TO_BCD(yrs);
BIN_TO_BCD(century);

writeb(val | 0x08, bq4802_regs + 0x0e);

writeb(sec, bq4802_regs + 0x00);
writeb(min, bq4802_regs + 0x02);
writeb(hrs, bq4802_regs + 0x04);
writeb(day, bq4802_regs + 0x06);
writeb(mon, bq4802_regs + 0x09);
writeb(yrs, bq4802_regs + 0x0a);
writeb(century, bq4802_regs + 0x0f);

writeb(val, bq4802_regs + 0x0e);

return 0;
}

struct mini_rtc_ops {
void (*get_rtc_time)(struct rtc_time *);
int (*set_rtc_time)(struct rtc_time *);
};

static struct mini_rtc_ops starfire_rtc_ops = {
.get_rtc_time = starfire_get_rtc_time,
.set_rtc_time = starfire_set_rtc_time,
};

static struct mini_rtc_ops hypervisor_rtc_ops = {
.get_rtc_time = hypervisor_get_rtc_time,
.set_rtc_time = hypervisor_set_rtc_time,
};

static struct mini_rtc_ops bq4802_rtc_ops = {
.get_rtc_time = bq4802_get_rtc_time,
.set_rtc_time = bq4802_set_rtc_time,
};

static struct mini_rtc_ops *mini_rtc_ops;

static inline void mini_get_rtc_time(struct rtc_time *time)
{
unsigned long flags;

spin_lock_irqsave(&rtc_lock, flags);
mini_rtc_ops->get_rtc_time(time);
spin_unlock_irqrestore(&rtc_lock, flags);
}

static inline int mini_set_rtc_time(struct rtc_time *time)
{
unsigned long flags;
int err;

spin_lock_irqsave(&rtc_lock, flags);
err = -ENODEV;
if (this_is_starfire)
err = starfire_set_time(seconds);
else if (tlb_type == hypervisor)
err = hypervisor_set_time(seconds);
err = mini_rtc_ops->set_rtc_time(time);
spin_unlock_irqrestore(&rtc_lock, flags);

return err;
Expand Down Expand Up @@ -1391,7 +1575,13 @@ static int __init rtc_mini_init(void)
{
int retval;

if (tlb_type != hypervisor && !this_is_starfire)
if (tlb_type == hypervisor)
mini_rtc_ops = &hypervisor_rtc_ops;
else if (this_is_starfire)
mini_rtc_ops = &starfire_rtc_ops;
else if (bq4802_regs)
mini_rtc_ops = &bq4802_rtc_ops;
else
return -ENODEV;

printk(KERN_INFO "Mini RTC Driver\n");
Expand Down

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