/*
* SuperH On-Chip RTC Support
*
- * Copyright (C) 2006, 2007 Paul Mundt
+ * Copyright (C) 2006 - 2009 Paul Mundt
* Copyright (C) 2006 Jamie Lenehan
+ * Copyright (C) 2008 Angelo Castello
*
* Based on the old arch/sh/kernel/cpu/rtc.c by:
*
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/io.h>
+#include <linux/log2.h>
+#include <linux/clk.h>
#include <asm/rtc.h>
#define DRV_NAME "sh-rtc"
-#define DRV_VERSION "0.1.3"
-
-#ifdef CONFIG_CPU_SH3
-#define rtc_reg_size sizeof(u16)
-#define RTC_BIT_INVERTED 0 /* No bug on SH7708, SH7709A */
-#define RTC_DEF_CAPABILITIES 0UL
-#elif defined(CONFIG_CPU_SH4)
-#define rtc_reg_size sizeof(u32)
-#define RTC_BIT_INVERTED 0x40 /* bug on SH7750, SH7750S */
-#define RTC_DEF_CAPABILITIES RTC_CAP_4_DIGIT_YEAR
-#endif
+#define DRV_VERSION "0.2.3"
#define RTC_REG(r) ((r) * rtc_reg_size)
#define RCR1 RTC_REG(14) /* Control */
#define RCR2 RTC_REG(15) /* Control */
+/*
+ * Note on RYRAR and RCR3: Up until this point most of the register
+ * definitions are consistent across all of the available parts. However,
+ * the placement of the optional RYRAR and RCR3 (the RYRAR control
+ * register used to control RYRCNT/RYRAR compare) varies considerably
+ * across various parts, occasionally being mapped in to a completely
+ * unrelated address space. For proper RYRAR support a separate resource
+ * would have to be handed off, but as this is purely optional in
+ * practice, we simply opt not to support it, thereby keeping the code
+ * quite a bit more simplified.
+ */
+
/* ALARM Bits - or with BCD encoded value */
#define AR_ENB 0x80 /* Enable for alarm cmp */
+/* Period Bits */
+#define PF_HP 0x100 /* Enable Half Period to support 8,32,128Hz */
+#define PF_COUNT 0x200 /* Half periodic counter */
+#define PF_OXS 0x400 /* Periodic One x Second */
+#define PF_KOU 0x800 /* Kernel or User periodic request 1=kernel */
+#define PF_MASK 0xf00
+
/* RCR1 Bits */
#define RCR1_CF 0x80 /* Carry Flag */
#define RCR1_CIE 0x10 /* Carry Interrupt Enable */
#define RCR2_START 0x01 /* Start bit */
struct sh_rtc {
- void __iomem *regbase;
- unsigned long regsize;
- struct resource *res;
- unsigned int alarm_irq, periodic_irq, carry_irq;
- struct rtc_device *rtc_dev;
- spinlock_t lock;
- int rearm_aie;
- unsigned long capabilities; /* See asm-sh/rtc.h for cap bits */
+ void __iomem *regbase;
+ unsigned long regsize;
+ struct resource *res;
+ int alarm_irq;
+ int periodic_irq;
+ int carry_irq;
+ struct clk *clk;
+ struct rtc_device *rtc_dev;
+ spinlock_t lock;
+ unsigned long capabilities; /* See asm/rtc.h for cap bits */
+ unsigned short periodic_freq;
};
-static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
+static int __sh_rtc_interrupt(struct sh_rtc *rtc)
{
- struct platform_device *pdev = to_platform_device(dev_id);
- struct sh_rtc *rtc = platform_get_drvdata(pdev);
- unsigned int tmp, events = 0;
-
- spin_lock(&rtc->lock);
+ unsigned int tmp, pending;
tmp = readb(rtc->regbase + RCR1);
+ pending = tmp & RCR1_CF;
tmp &= ~RCR1_CF;
+ writeb(tmp, rtc->regbase + RCR1);
- if (rtc->rearm_aie) {
- if (tmp & RCR1_AF)
- tmp &= ~RCR1_AF; /* try to clear AF again */
- else {
- tmp |= RCR1_AIE; /* AF has cleared, rearm IRQ */
- rtc->rearm_aie = 0;
- }
- }
+ /* Users have requested One x Second IRQ */
+ if (pending && rtc->periodic_freq & PF_OXS)
+ rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);
- writeb(tmp, rtc->regbase + RCR1);
+ return pending;
+}
- rtc_update_irq(rtc->rtc_dev, 1, events);
+static int __sh_rtc_alarm(struct sh_rtc *rtc)
+{
+ unsigned int tmp, pending;
- spin_unlock(&rtc->lock);
+ tmp = readb(rtc->regbase + RCR1);
+ pending = tmp & RCR1_AF;
+ tmp &= ~(RCR1_AF | RCR1_AIE);
+ writeb(tmp, rtc->regbase + RCR1);
+
+ if (pending)
+ rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
- return IRQ_HANDLED;
+ return pending;
}
-static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
+static int __sh_rtc_periodic(struct sh_rtc *rtc)
{
- struct platform_device *pdev = to_platform_device(dev_id);
- struct sh_rtc *rtc = platform_get_drvdata(pdev);
- unsigned int tmp, events = 0;
+ struct rtc_device *rtc_dev = rtc->rtc_dev;
+ struct rtc_task *irq_task;
+ unsigned int tmp, pending;
- spin_lock(&rtc->lock);
+ tmp = readb(rtc->regbase + RCR2);
+ pending = tmp & RCR2_PEF;
+ tmp &= ~RCR2_PEF;
+ writeb(tmp, rtc->regbase + RCR2);
- tmp = readb(rtc->regbase + RCR1);
+ if (!pending)
+ return 0;
+
+ /* Half period enabled than one skipped and the next notified */
+ if ((rtc->periodic_freq & PF_HP) && (rtc->periodic_freq & PF_COUNT))
+ rtc->periodic_freq &= ~PF_COUNT;
+ else {
+ if (rtc->periodic_freq & PF_HP)
+ rtc->periodic_freq |= PF_COUNT;
+ if (rtc->periodic_freq & PF_KOU) {
+ spin_lock(&rtc_dev->irq_task_lock);
+ irq_task = rtc_dev->irq_task;
+ if (irq_task)
+ irq_task->func(irq_task->private_data);
+ spin_unlock(&rtc_dev->irq_task_lock);
+ } else
+ rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
+ }
- /*
- * If AF is set then the alarm has triggered. If we clear AF while
- * the alarm time still matches the RTC time then AF will
- * immediately be set again, and if AIE is enabled then the alarm
- * interrupt will immediately be retrigger. So we clear AIE here
- * and use rtc->rearm_aie so that the carry interrupt will keep
- * trying to clear AF and once it stays cleared it'll re-enable
- * AIE.
- */
- if (tmp & RCR1_AF) {
- events |= RTC_AF | RTC_IRQF;
+ return pending;
+}
- tmp &= ~(RCR1_AF|RCR1_AIE);
+static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
+{
+ struct sh_rtc *rtc = dev_id;
+ int ret;
- writeb(tmp, rtc->regbase + RCR1);
+ spin_lock(&rtc->lock);
+ ret = __sh_rtc_interrupt(rtc);
+ spin_unlock(&rtc->lock);
- rtc->rearm_aie = 1;
+ return IRQ_RETVAL(ret);
+}
- rtc_update_irq(rtc->rtc_dev, 1, events);
- }
+static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
+{
+ struct sh_rtc *rtc = dev_id;
+ int ret;
+ spin_lock(&rtc->lock);
+ ret = __sh_rtc_alarm(rtc);
spin_unlock(&rtc->lock);
- return IRQ_HANDLED;
+
+ return IRQ_RETVAL(ret);
}
static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
{
- struct platform_device *pdev = to_platform_device(dev_id);
- struct sh_rtc *rtc = platform_get_drvdata(pdev);
+ struct sh_rtc *rtc = dev_id;
+ int ret;
spin_lock(&rtc->lock);
+ ret = __sh_rtc_periodic(rtc);
+ spin_unlock(&rtc->lock);
- rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
+ return IRQ_RETVAL(ret);
+}
+
+static irqreturn_t sh_rtc_shared(int irq, void *dev_id)
+{
+ struct sh_rtc *rtc = dev_id;
+ int ret;
+ spin_lock(&rtc->lock);
+ ret = __sh_rtc_interrupt(rtc);
+ ret |= __sh_rtc_alarm(rtc);
+ ret |= __sh_rtc_periodic(rtc);
spin_unlock(&rtc->lock);
- return IRQ_HANDLED;
+ return IRQ_RETVAL(ret);
}
-static inline void sh_rtc_setpie(struct device *dev, unsigned int enable)
+static int sh_rtc_irq_set_state(struct device *dev, int enable)
{
struct sh_rtc *rtc = dev_get_drvdata(dev);
unsigned int tmp;
tmp = readb(rtc->regbase + RCR2);
if (enable) {
- tmp &= ~RCR2_PESMASK;
- tmp |= RCR2_PEF | (2 << 4);
- } else
+ rtc->periodic_freq |= PF_KOU;
+ tmp &= ~RCR2_PEF; /* Clear PES bit */
+ tmp |= (rtc->periodic_freq & ~PF_HP); /* Set PES2-0 */
+ } else {
+ rtc->periodic_freq &= ~PF_KOU;
tmp &= ~(RCR2_PESMASK | RCR2_PEF);
+ }
writeb(tmp, rtc->regbase + RCR2);
spin_unlock_irq(&rtc->lock);
+
+ return 0;
}
-static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
+static int sh_rtc_irq_set_freq(struct device *dev, int freq)
{
struct sh_rtc *rtc = dev_get_drvdata(dev);
- unsigned int tmp;
+ int tmp, ret = 0;
spin_lock_irq(&rtc->lock);
+ tmp = rtc->periodic_freq & PF_MASK;
- tmp = readb(rtc->regbase + RCR1);
-
- if (!enable) {
- tmp &= ~RCR1_AIE;
- rtc->rearm_aie = 0;
- } else if (rtc->rearm_aie == 0)
- tmp |= RCR1_AIE;
+ switch (freq) {
+ case 0:
+ rtc->periodic_freq = 0x00;
+ break;
+ case 1:
+ rtc->periodic_freq = 0x60;
+ break;
+ case 2:
+ rtc->periodic_freq = 0x50;
+ break;
+ case 4:
+ rtc->periodic_freq = 0x40;
+ break;
+ case 8:
+ rtc->periodic_freq = 0x30 | PF_HP;
+ break;
+ case 16:
+ rtc->periodic_freq = 0x30;
+ break;
+ case 32:
+ rtc->periodic_freq = 0x20 | PF_HP;
+ break;
+ case 64:
+ rtc->periodic_freq = 0x20;
+ break;
+ case 128:
+ rtc->periodic_freq = 0x10 | PF_HP;
+ break;
+ case 256:
+ rtc->periodic_freq = 0x10;
+ break;
+ default:
+ ret = -ENOTSUPP;
+ }
- writeb(tmp, rtc->regbase + RCR1);
+ if (ret == 0)
+ rtc->periodic_freq |= tmp;
spin_unlock_irq(&rtc->lock);
+ return ret;
}
-static int sh_rtc_open(struct device *dev)
+static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
{
struct sh_rtc *rtc = dev_get_drvdata(dev);
unsigned int tmp;
- int ret;
-
- tmp = readb(rtc->regbase + RCR1);
- tmp &= ~RCR1_CF;
- tmp |= RCR1_CIE;
- writeb(tmp, rtc->regbase + RCR1);
- ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, IRQF_DISABLED,
- "sh-rtc period", dev);
- if (unlikely(ret)) {
- dev_err(dev, "request period IRQ failed with %d, IRQ %d\n",
- ret, rtc->periodic_irq);
- return ret;
- }
-
- ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, IRQF_DISABLED,
- "sh-rtc carry", dev);
- if (unlikely(ret)) {
- dev_err(dev, "request carry IRQ failed with %d, IRQ %d\n",
- ret, rtc->carry_irq);
- free_irq(rtc->periodic_irq, dev);
- goto err_bad_carry;
- }
+ spin_lock_irq(&rtc->lock);
- ret = request_irq(rtc->alarm_irq, sh_rtc_alarm, IRQF_DISABLED,
- "sh-rtc alarm", dev);
- if (unlikely(ret)) {
- dev_err(dev, "request alarm IRQ failed with %d, IRQ %d\n",
- ret, rtc->alarm_irq);
- goto err_bad_alarm;
- }
+ tmp = readb(rtc->regbase + RCR1);
- return 0;
+ if (enable)
+ tmp |= RCR1_AIE;
+ else
+ tmp &= ~RCR1_AIE;
-err_bad_alarm:
- free_irq(rtc->carry_irq, dev);
-err_bad_carry:
- free_irq(rtc->periodic_irq, dev);
+ writeb(tmp, rtc->regbase + RCR1);
- return ret;
+ spin_unlock_irq(&rtc->lock);
}
-static void sh_rtc_release(struct device *dev)
+static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
{
struct sh_rtc *rtc = dev_get_drvdata(dev);
+ unsigned int tmp;
+
+ tmp = readb(rtc->regbase + RCR1);
+ seq_printf(seq, "carry_IRQ\t: %s\n", (tmp & RCR1_CIE) ? "yes" : "no");
- sh_rtc_setpie(dev, 0);
- sh_rtc_setaie(dev, 0);
+ tmp = readb(rtc->regbase + RCR2);
+ seq_printf(seq, "periodic_IRQ\t: %s\n",
+ (tmp & RCR2_PESMASK) ? "yes" : "no");
- free_irq(rtc->periodic_irq, dev);
- free_irq(rtc->carry_irq, dev);
- free_irq(rtc->alarm_irq, dev);
+ return 0;
}
-static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
+static inline void sh_rtc_setcie(struct device *dev, unsigned int enable)
{
struct sh_rtc *rtc = dev_get_drvdata(dev);
unsigned int tmp;
+ spin_lock_irq(&rtc->lock);
+
tmp = readb(rtc->regbase + RCR1);
- seq_printf(seq, "carry_IRQ\t: %s\n",
- (tmp & RCR1_CIE) ? "yes" : "no");
- tmp = readb(rtc->regbase + RCR2);
- seq_printf(seq, "periodic_IRQ\t: %s\n",
- (tmp & RCR2_PEF) ? "yes" : "no");
+ if (!enable)
+ tmp &= ~RCR1_CIE;
+ else
+ tmp |= RCR1_CIE;
- return 0;
+ writeb(tmp, rtc->regbase + RCR1);
+
+ spin_unlock_irq(&rtc->lock);
}
static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
- unsigned int ret = -ENOIOCTLCMD;
+ struct sh_rtc *rtc = dev_get_drvdata(dev);
+ unsigned int ret = 0;
switch (cmd) {
- case RTC_PIE_OFF:
- case RTC_PIE_ON:
- sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
- ret = 0;
- break;
case RTC_AIE_OFF:
case RTC_AIE_ON:
sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
- ret = 0;
break;
+ case RTC_UIE_OFF:
+ rtc->periodic_freq &= ~PF_OXS;
+ sh_rtc_setcie(dev, 0);
+ break;
+ case RTC_UIE_ON:
+ rtc->periodic_freq |= PF_OXS;
+ sh_rtc_setcie(dev, 1);
+ break;
+ default:
+ ret = -ENOIOCTLCMD;
}
return ret;
sec128 = readb(rtc->regbase + R64CNT);
- tm->tm_sec = BCD2BIN(readb(rtc->regbase + RSECCNT));
- tm->tm_min = BCD2BIN(readb(rtc->regbase + RMINCNT));
- tm->tm_hour = BCD2BIN(readb(rtc->regbase + RHRCNT));
- tm->tm_wday = BCD2BIN(readb(rtc->regbase + RWKCNT));
- tm->tm_mday = BCD2BIN(readb(rtc->regbase + RDAYCNT));
- tm->tm_mon = BCD2BIN(readb(rtc->regbase + RMONCNT)) - 1;
+ tm->tm_sec = bcd2bin(readb(rtc->regbase + RSECCNT));
+ tm->tm_min = bcd2bin(readb(rtc->regbase + RMINCNT));
+ tm->tm_hour = bcd2bin(readb(rtc->regbase + RHRCNT));
+ tm->tm_wday = bcd2bin(readb(rtc->regbase + RWKCNT));
+ tm->tm_mday = bcd2bin(readb(rtc->regbase + RDAYCNT));
+ tm->tm_mon = bcd2bin(readb(rtc->regbase + RMONCNT)) - 1;
if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
yr = readw(rtc->regbase + RYRCNT);
- yr100 = BCD2BIN(yr >> 8);
+ yr100 = bcd2bin(yr >> 8);
yr &= 0xff;
} else {
yr = readb(rtc->regbase + RYRCNT);
- yr100 = BCD2BIN((yr == 0x99) ? 0x19 : 0x20);
+ yr100 = bcd2bin((yr == 0x99) ? 0x19 : 0x20);
}
- tm->tm_year = (yr100 * 100 + BCD2BIN(yr)) - 1900;
+ tm->tm_year = (yr100 * 100 + bcd2bin(yr)) - 1900;
sec2 = readb(rtc->regbase + R64CNT);
cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
tm->tm_sec--;
#endif
+ /* only keep the carry interrupt enabled if UIE is on */
+ if (!(rtc->periodic_freq & PF_OXS))
+ sh_rtc_setcie(dev, 0);
+
dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
"mday=%d, mon=%d, year=%d, wday=%d\n",
- __FUNCTION__,
+ __func__,
tm->tm_sec, tm->tm_min, tm->tm_hour,
tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
- if (rtc_valid_tm(tm) < 0) {
- dev_err(dev, "invalid date\n");
- rtc_time_to_tm(0, tm);
- }
-
- return 0;
+ return rtc_valid_tm(tm);
}
static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
tmp &= ~RCR2_START;
writeb(tmp, rtc->regbase + RCR2);
- writeb(BIN2BCD(tm->tm_sec), rtc->regbase + RSECCNT);
- writeb(BIN2BCD(tm->tm_min), rtc->regbase + RMINCNT);
- writeb(BIN2BCD(tm->tm_hour), rtc->regbase + RHRCNT);
- writeb(BIN2BCD(tm->tm_wday), rtc->regbase + RWKCNT);
- writeb(BIN2BCD(tm->tm_mday), rtc->regbase + RDAYCNT);
- writeb(BIN2BCD(tm->tm_mon + 1), rtc->regbase + RMONCNT);
+ writeb(bin2bcd(tm->tm_sec), rtc->regbase + RSECCNT);
+ writeb(bin2bcd(tm->tm_min), rtc->regbase + RMINCNT);
+ writeb(bin2bcd(tm->tm_hour), rtc->regbase + RHRCNT);
+ writeb(bin2bcd(tm->tm_wday), rtc->regbase + RWKCNT);
+ writeb(bin2bcd(tm->tm_mday), rtc->regbase + RDAYCNT);
+ writeb(bin2bcd(tm->tm_mon + 1), rtc->regbase + RMONCNT);
if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
- year = (BIN2BCD((tm->tm_year + 1900) / 100) << 8) |
- BIN2BCD(tm->tm_year % 100);
+ year = (bin2bcd((tm->tm_year + 1900) / 100) << 8) |
+ bin2bcd(tm->tm_year % 100);
writew(year, rtc->regbase + RYRCNT);
} else {
year = tm->tm_year % 100;
- writeb(BIN2BCD(year), rtc->regbase + RYRCNT);
+ writeb(bin2bcd(year), rtc->regbase + RYRCNT);
}
/* Start RTC */
byte = readb(rtc->regbase + reg_off);
if (byte & AR_ENB) {
byte &= ~AR_ENB; /* strip the enable bit */
- value = BCD2BIN(byte);
+ value = bcd2bin(byte);
}
return value;
{
struct platform_device *pdev = to_platform_device(dev);
struct sh_rtc *rtc = platform_get_drvdata(pdev);
- struct rtc_time* tm = &wkalrm->time;
+ struct rtc_time *tm = &wkalrm->time;
spin_lock_irq(&rtc->lock);
if (value < 0)
writeb(0, rtc->regbase + reg_off);
else
- writeb(BIN2BCD(value) | AR_ENB, rtc->regbase + reg_off);
+ writeb(bin2bcd(value) | AR_ENB, rtc->regbase + reg_off);
}
-static int sh_rtc_check_alarm(struct rtc_time* tm)
+static int sh_rtc_check_alarm(struct rtc_time *tm)
{
/*
* The original rtc says anything > 0xc0 is "don't care" or "match
/* disable alarm interrupt and clear the alarm flag */
rcr1 = readb(rtc->regbase + RCR1);
- rcr1 &= ~(RCR1_AF|RCR1_AIE);
+ rcr1 &= ~(RCR1_AF | RCR1_AIE);
writeb(rcr1, rtc->regbase + RCR1);
- rtc->rearm_aie = 0;
-
/* set alarm time */
sh_rtc_write_alarm_value(rtc, tm->tm_sec, RSECAR);
sh_rtc_write_alarm_value(rtc, tm->tm_min, RMINAR);
}
static struct rtc_class_ops sh_rtc_ops = {
- .open = sh_rtc_open,
- .release = sh_rtc_release,
.ioctl = sh_rtc_ioctl,
.read_time = sh_rtc_read_time,
.set_time = sh_rtc_set_time,
.read_alarm = sh_rtc_read_alarm,
.set_alarm = sh_rtc_set_alarm,
+ .irq_set_state = sh_rtc_irq_set_state,
+ .irq_set_freq = sh_rtc_irq_set_freq,
.proc = sh_rtc_proc,
};
-static int __devinit sh_rtc_probe(struct platform_device *pdev)
+static int __init sh_rtc_probe(struct platform_device *pdev)
{
struct sh_rtc *rtc;
struct resource *res;
- int ret = -ENOENT;
+ struct rtc_time r;
+ char clk_name[6];
+ int clk_id, ret;
rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
if (unlikely(!rtc))
spin_lock_init(&rtc->lock);
- rtc->periodic_irq = platform_get_irq(pdev, 0);
- if (unlikely(rtc->periodic_irq < 0)) {
- dev_err(&pdev->dev, "No IRQ for period\n");
+ /* get periodic/carry/alarm irqs */
+ ret = platform_get_irq(pdev, 0);
+ if (unlikely(ret <= 0)) {
+ ret = -ENOENT;
+ dev_err(&pdev->dev, "No IRQ resource\n");
goto err_badres;
}
+ rtc->periodic_irq = ret;
rtc->carry_irq = platform_get_irq(pdev, 1);
- if (unlikely(rtc->carry_irq < 0)) {
- dev_err(&pdev->dev, "No IRQ for carry\n");
- goto err_badres;
- }
-
rtc->alarm_irq = platform_get_irq(pdev, 2);
- if (unlikely(rtc->alarm_irq < 0)) {
- dev_err(&pdev->dev, "No IRQ for alarm\n");
- goto err_badres;
- }
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (unlikely(res == NULL)) {
+ ret = -ENOENT;
dev_err(&pdev->dev, "No IO resource\n");
goto err_badres;
}
- rtc->regsize = res->end - res->start + 1;
+ rtc->regsize = resource_size(res);
rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
if (unlikely(!rtc->res)) {
goto err_badres;
}
- rtc->regbase = (void __iomem *)rtc->res->start;
+ rtc->regbase = ioremap_nocache(rtc->res->start, rtc->regsize);
if (unlikely(!rtc->regbase)) {
ret = -EINVAL;
goto err_badmap;
}
- rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
- &sh_rtc_ops, THIS_MODULE);
- if (IS_ERR(rtc->rtc_dev)) {
- ret = PTR_ERR(rtc->rtc_dev);
- goto err_badmap;
+ clk_id = pdev->id;
+ /* With a single device, the clock id is still "rtc0" */
+ if (clk_id < 0)
+ clk_id = 0;
+
+ snprintf(clk_name, sizeof(clk_name), "rtc%d", clk_id);
+
+ rtc->clk = clk_get(&pdev->dev, clk_name);
+ if (IS_ERR(rtc->clk)) {
+ /*
+ * No error handling for rtc->clk intentionally, not all
+ * platforms will have a unique clock for the RTC, and
+ * the clk API can handle the struct clk pointer being
+ * NULL.
+ */
+ rtc->clk = NULL;
}
+ clk_enable(rtc->clk);
+
rtc->capabilities = RTC_DEF_CAPABILITIES;
if (pdev->dev.platform_data) {
struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data;
rtc->capabilities |= pinfo->capabilities;
}
+ if (rtc->carry_irq <= 0) {
+ /* register shared periodic/carry/alarm irq */
+ ret = request_irq(rtc->periodic_irq, sh_rtc_shared,
+ IRQF_DISABLED, "sh-rtc", rtc);
+ if (unlikely(ret)) {
+ dev_err(&pdev->dev,
+ "request IRQ failed with %d, IRQ %d\n", ret,
+ rtc->periodic_irq);
+ goto err_unmap;
+ }
+ } else {
+ /* register periodic/carry/alarm irqs */
+ ret = request_irq(rtc->periodic_irq, sh_rtc_periodic,
+ IRQF_DISABLED, "sh-rtc period", rtc);
+ if (unlikely(ret)) {
+ dev_err(&pdev->dev,
+ "request period IRQ failed with %d, IRQ %d\n",
+ ret, rtc->periodic_irq);
+ goto err_unmap;
+ }
+
+ ret = request_irq(rtc->carry_irq, sh_rtc_interrupt,
+ IRQF_DISABLED, "sh-rtc carry", rtc);
+ if (unlikely(ret)) {
+ dev_err(&pdev->dev,
+ "request carry IRQ failed with %d, IRQ %d\n",
+ ret, rtc->carry_irq);
+ free_irq(rtc->periodic_irq, rtc);
+ goto err_unmap;
+ }
+
+ ret = request_irq(rtc->alarm_irq, sh_rtc_alarm,
+ IRQF_DISABLED, "sh-rtc alarm", rtc);
+ if (unlikely(ret)) {
+ dev_err(&pdev->dev,
+ "request alarm IRQ failed with %d, IRQ %d\n",
+ ret, rtc->alarm_irq);
+ free_irq(rtc->carry_irq, rtc);
+ free_irq(rtc->periodic_irq, rtc);
+ goto err_unmap;
+ }
+ }
+
platform_set_drvdata(pdev, rtc);
+ /* everything disabled by default */
+ sh_rtc_irq_set_freq(&pdev->dev, 0);
+ sh_rtc_irq_set_state(&pdev->dev, 0);
+ sh_rtc_setaie(&pdev->dev, 0);
+ sh_rtc_setcie(&pdev->dev, 0);
+
+ rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
+ &sh_rtc_ops, THIS_MODULE);
+ if (IS_ERR(rtc->rtc_dev)) {
+ ret = PTR_ERR(rtc->rtc_dev);
+ free_irq(rtc->periodic_irq, rtc);
+ free_irq(rtc->carry_irq, rtc);
+ free_irq(rtc->alarm_irq, rtc);
+ goto err_unmap;
+ }
+
+ rtc->rtc_dev->max_user_freq = 256;
+
+ /* reset rtc to epoch 0 if time is invalid */
+ if (rtc_read_time(rtc->rtc_dev, &r) < 0) {
+ rtc_time_to_tm(0, &r);
+ rtc_set_time(rtc->rtc_dev, &r);
+ }
+
+ device_init_wakeup(&pdev->dev, 1);
return 0;
+err_unmap:
+ clk_disable(rtc->clk);
+ clk_put(rtc->clk);
+ iounmap(rtc->regbase);
err_badmap:
release_resource(rtc->res);
err_badres:
return ret;
}
-static int __devexit sh_rtc_remove(struct platform_device *pdev)
+static int __exit sh_rtc_remove(struct platform_device *pdev)
{
struct sh_rtc *rtc = platform_get_drvdata(pdev);
- if (likely(rtc->rtc_dev))
- rtc_device_unregister(rtc->rtc_dev);
+ rtc_device_unregister(rtc->rtc_dev);
+ sh_rtc_irq_set_state(&pdev->dev, 0);
- sh_rtc_setpie(&pdev->dev, 0);
sh_rtc_setaie(&pdev->dev, 0);
+ sh_rtc_setcie(&pdev->dev, 0);
+
+ free_irq(rtc->periodic_irq, rtc);
+
+ if (rtc->carry_irq > 0) {
+ free_irq(rtc->carry_irq, rtc);
+ free_irq(rtc->alarm_irq, rtc);
+ }
+ iounmap(rtc->regbase);
release_resource(rtc->res);
+ clk_disable(rtc->clk);
+ clk_put(rtc->clk);
+
platform_set_drvdata(pdev, NULL);
kfree(rtc);
return 0;
}
+
+static void sh_rtc_set_irq_wake(struct device *dev, int enabled)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct sh_rtc *rtc = platform_get_drvdata(pdev);
+
+ set_irq_wake(rtc->periodic_irq, enabled);
+
+ if (rtc->carry_irq > 0) {
+ set_irq_wake(rtc->carry_irq, enabled);
+ set_irq_wake(rtc->alarm_irq, enabled);
+ }
+}
+
+static int sh_rtc_suspend(struct device *dev)
+{
+ if (device_may_wakeup(dev))
+ sh_rtc_set_irq_wake(dev, 1);
+
+ return 0;
+}
+
+static int sh_rtc_resume(struct device *dev)
+{
+ if (device_may_wakeup(dev))
+ sh_rtc_set_irq_wake(dev, 0);
+
+ return 0;
+}
+
+static const struct dev_pm_ops sh_rtc_dev_pm_ops = {
+ .suspend = sh_rtc_suspend,
+ .resume = sh_rtc_resume,
+};
+
static struct platform_driver sh_rtc_platform_driver = {
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
+ .pm = &sh_rtc_dev_pm_ops,
},
- .probe = sh_rtc_probe,
- .remove = __devexit_p(sh_rtc_remove),
+ .remove = __exit_p(sh_rtc_remove),
};
static int __init sh_rtc_init(void)
{
- return platform_driver_register(&sh_rtc_platform_driver);
+ return platform_driver_probe(&sh_rtc_platform_driver, sh_rtc_probe);
}
static void __exit sh_rtc_exit(void)
MODULE_DESCRIPTION("SuperH on-chip RTC driver");
MODULE_VERSION(DRV_VERSION);
-MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, Jamie Lenehan <lenehan@twibble.org>");
+MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, "
+ "Jamie Lenehan <lenehan@twibble.org>, "
+ "Angelo Castello <angelo.castello@st.com>");
MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff