linux/drivers/rtc/rtc-sh.c
Linus Torvalds 8e4ff713ce RTC for 5.2
Subsystem:
  - set_mmss and set_mmss64 rtc_ops removal
  - Fix timestamp value for RTC_TIMESTAMP_BEGIN_1900
  - Use SPDX identifier for the core
  - validate upper bound of tm->tm_year
 
 New driver:
  - Aspeed BMC SoC RTC
 
 Drivers:
  - abx80x: use rtc_add_group
  - ds3232: nvram support
  - pcf85063: add alarm, nvram, offset correction and microcrystal rv8263 support
  - x1205: add of_match_table
  - Use set_time instead of set_mms/set_mmss64 for: ab3100, coh901331, digicolor,
    ds1672, ds2404, ep93xx, imxdi, jz4740, lpc32xx, mc13xxx, mxc, pcap, stmp3xxx,
    test, wm831x, xgene.
  - Set RTC range for: ab3100, at91sam9, coh901331, da9063, digicolor, dm355evm,
    ds1672, ds2404, ep39xx, goldfish, imxdi, jz4740, lpc32xx, mc13xxx, mv, mxc,
    omap, pcap, pcf85063, pcf85363, ps3, sh, stmp3xxx, sun4v, tegra, wm831x,
    xgene.
  - Switch to rtc_time64_to_tm/rtc_tm_to_time64 for the driver that properly set
    the RTC range.
  - Use dev_get_drvdata instead of multiple indirections.
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Merge tag 'rtc-5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux

Pull RTC updates from Alexandre Belloni:
 "A huge series from me this cycle. I went through many drivers to set
  the date and time range supported by the RTC which helps solving HW
  limitation when the time comes (as early as next year for some). This
  time, I focused on drivers using .set_mms and .set_mmss64, allowing me
  to remove those callbacks. About a third of the patches got reviews, I
  actually own the RTCs and I tested another third and the remaining one
  are unlikely to cause any issues.

  Other than that, a single new driver and the usual fixes here and there.

  Summary:

  Subsystem:

   - set_mmss and set_mmss64 rtc_ops removal

   - Fix timestamp value for RTC_TIMESTAMP_BEGIN_1900

   - Use SPDX identifier for the core

   - validate upper bound of tm->tm_year

  New driver:

   - Aspeed BMC SoC RTC

  Drivers:

   - abx80x: use rtc_add_group

   - ds3232: nvram support

   - pcf85063: add alarm, nvram, offset correction and microcrystal
     rv8263 support

   - x1205: add of_match_table

   - Use set_time instead of set_mms/set_mmss64 for: ab3100, coh901331,
     digicolor, ds1672, ds2404, ep93xx, imxdi, jz4740, lpc32xx, mc13xxx,
     mxc, pcap, stmp3xxx, test, wm831x, xgene.

   - Set RTC range for: ab3100, at91sam9, coh901331, da9063, digicolor,
     dm355evm, ds1672, ds2404, ep39xx, goldfish, imxdi, jz4740, lpc32xx,
     mc13xxx, mv, mxc, omap, pcap, pcf85063, pcf85363, ps3, sh,
     stmp3xxx, sun4v, tegra, wm831x, xgene.

   - Switch to rtc_time64_to_tm/rtc_tm_to_time64 for the driver that
     properly set the RTC range.

   - Use dev_get_drvdata instead of multiple indirections"

* tag 'rtc-5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (177 commits)
  rtc: snvs: Use __maybe_unused instead of #if CONFIG_PM_SLEEP
  rtc: imxdi: remove unused variable
  rtc: drop set_mms and set_mmss64
  rtc: pcap: convert to SPDX identifier
  rtc: pcap: use .set_time
  rtc: pcap: switch to rtc_time64_to_tm/rtc_tm_to_time64
  rtc: pcap: set range
  rtc: digicolor: convert to SPDX identifier
  rtc: digicolor: use .set_time
  rtc: digicolor: set range
  rtc: digicolor: fix possible race condition
  rtc: jz4740: convert to SPDX identifier
  rtc: jz4740: rework invalid time detection
  rtc: jz4740: use dev_pm_set_wake_irq() to simplify code
  rtc: jz4740: use .set_time
  rtc: jz4740: remove useless check
  rtc: jz4740: switch to rtc_time64_to_tm/rtc_tm_to_time64
  rtc: jz4740: set range
  rtc: 88pm860x: prevent use-after-free on device remove
  rtc: Use dev_get_drvdata()
  ...
2019-05-09 14:46:33 -07:00

689 lines
17 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* SuperH On-Chip RTC Support
*
* 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:
*
* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
* Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka
*/
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/kernel.h>
#include <linux/bcd.h>
#include <linux/rtc.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/log2.h>
#include <linux/clk.h>
#include <linux/slab.h>
#ifdef CONFIG_SUPERH
#include <asm/rtc.h>
#else
/* Default values for RZ/A RTC */
#define rtc_reg_size sizeof(u16)
#define RTC_BIT_INVERTED 0 /* no chip bugs */
#define RTC_CAP_4_DIGIT_YEAR (1 << 0)
#define RTC_DEF_CAPABILITIES RTC_CAP_4_DIGIT_YEAR
#endif
#define DRV_NAME "sh-rtc"
#define RTC_REG(r) ((r) * rtc_reg_size)
#define R64CNT RTC_REG(0)
#define RSECCNT RTC_REG(1) /* RTC sec */
#define RMINCNT RTC_REG(2) /* RTC min */
#define RHRCNT RTC_REG(3) /* RTC hour */
#define RWKCNT RTC_REG(4) /* RTC week */
#define RDAYCNT RTC_REG(5) /* RTC day */
#define RMONCNT RTC_REG(6) /* RTC month */
#define RYRCNT RTC_REG(7) /* RTC year */
#define RSECAR RTC_REG(8) /* ALARM sec */
#define RMINAR RTC_REG(9) /* ALARM min */
#define RHRAR RTC_REG(10) /* ALARM hour */
#define RWKAR RTC_REG(11) /* ALARM week */
#define RDAYAR RTC_REG(12) /* ALARM day */
#define RMONAR RTC_REG(13) /* ALARM month */
#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 RCR1_AIE 0x08 /* Alarm Interrupt Enable */
#define RCR1_AF 0x01 /* Alarm Flag */
/* RCR2 Bits */
#define RCR2_PEF 0x80 /* PEriodic interrupt Flag */
#define RCR2_PESMASK 0x70 /* Periodic interrupt Set */
#define RCR2_RTCEN 0x08 /* ENable RTC */
#define RCR2_ADJ 0x04 /* ADJustment (30-second) */
#define RCR2_RESET 0x02 /* Reset bit */
#define RCR2_START 0x01 /* Start bit */
struct sh_rtc {
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 int __sh_rtc_interrupt(struct sh_rtc *rtc)
{
unsigned int tmp, pending;
tmp = readb(rtc->regbase + RCR1);
pending = tmp & RCR1_CF;
tmp &= ~RCR1_CF;
writeb(tmp, rtc->regbase + RCR1);
/* 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);
return pending;
}
static int __sh_rtc_alarm(struct sh_rtc *rtc)
{
unsigned int tmp, pending;
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 pending;
}
static int __sh_rtc_periodic(struct sh_rtc *rtc)
{
unsigned int tmp, pending;
tmp = readb(rtc->regbase + RCR2);
pending = tmp & RCR2_PEF;
tmp &= ~RCR2_PEF;
writeb(tmp, rtc->regbase + RCR2);
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;
rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
}
return pending;
}
static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
{
struct sh_rtc *rtc = dev_id;
int ret;
spin_lock(&rtc->lock);
ret = __sh_rtc_interrupt(rtc);
spin_unlock(&rtc->lock);
return IRQ_RETVAL(ret);
}
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_RETVAL(ret);
}
static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
{
struct sh_rtc *rtc = dev_id;
int ret;
spin_lock(&rtc->lock);
ret = __sh_rtc_periodic(rtc);
spin_unlock(&rtc->lock);
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_RETVAL(ret);
}
static inline void sh_rtc_setaie(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);
if (enable)
tmp |= RCR1_AIE;
else
tmp &= ~RCR1_AIE;
writeb(tmp, rtc->regbase + RCR1);
spin_unlock_irq(&rtc->lock);
}
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");
tmp = readb(rtc->regbase + RCR2);
seq_printf(seq, "periodic_IRQ\t: %s\n",
(tmp & RCR2_PESMASK) ? "yes" : "no");
return 0;
}
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);
if (!enable)
tmp &= ~RCR1_CIE;
else
tmp |= RCR1_CIE;
writeb(tmp, rtc->regbase + RCR1);
spin_unlock_irq(&rtc->lock);
}
static int sh_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
sh_rtc_setaie(dev, enabled);
return 0;
}
static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct sh_rtc *rtc = dev_get_drvdata(dev);
unsigned int sec128, sec2, yr, yr100, cf_bit;
if (!(readb(rtc->regbase + RCR2) & RCR2_RTCEN))
return -EINVAL;
do {
unsigned int tmp;
spin_lock_irq(&rtc->lock);
tmp = readb(rtc->regbase + RCR1);
tmp &= ~RCR1_CF; /* Clear CF-bit */
tmp |= RCR1_CIE;
writeb(tmp, rtc->regbase + RCR1);
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;
if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
yr = readw(rtc->regbase + RYRCNT);
yr100 = bcd2bin(yr >> 8);
yr &= 0xff;
} else {
yr = readb(rtc->regbase + RYRCNT);
yr100 = bcd2bin((yr == 0x99) ? 0x19 : 0x20);
}
tm->tm_year = (yr100 * 100 + bcd2bin(yr)) - 1900;
sec2 = readb(rtc->regbase + R64CNT);
cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
spin_unlock_irq(&rtc->lock);
} while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
#if RTC_BIT_INVERTED != 0
if ((sec128 & RTC_BIT_INVERTED))
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",
__func__,
tm->tm_sec, tm->tm_min, tm->tm_hour,
tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
return 0;
}
static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct sh_rtc *rtc = dev_get_drvdata(dev);
unsigned int tmp;
int year;
spin_lock_irq(&rtc->lock);
/* Reset pre-scaler & stop RTC */
tmp = readb(rtc->regbase + RCR2);
tmp |= RCR2_RESET;
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);
if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
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);
}
/* Start RTC */
tmp = readb(rtc->regbase + RCR2);
tmp &= ~RCR2_RESET;
tmp |= RCR2_RTCEN | RCR2_START;
writeb(tmp, rtc->regbase + RCR2);
spin_unlock_irq(&rtc->lock);
return 0;
}
static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)
{
unsigned int byte;
int value = -1; /* return -1 for ignored values */
byte = readb(rtc->regbase + reg_off);
if (byte & AR_ENB) {
byte &= ~AR_ENB; /* strip the enable bit */
value = bcd2bin(byte);
}
return value;
}
static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
{
struct sh_rtc *rtc = dev_get_drvdata(dev);
struct rtc_time *tm = &wkalrm->time;
spin_lock_irq(&rtc->lock);
tm->tm_sec = sh_rtc_read_alarm_value(rtc, RSECAR);
tm->tm_min = sh_rtc_read_alarm_value(rtc, RMINAR);
tm->tm_hour = sh_rtc_read_alarm_value(rtc, RHRAR);
tm->tm_wday = sh_rtc_read_alarm_value(rtc, RWKAR);
tm->tm_mday = sh_rtc_read_alarm_value(rtc, RDAYAR);
tm->tm_mon = sh_rtc_read_alarm_value(rtc, RMONAR);
if (tm->tm_mon > 0)
tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;
spin_unlock_irq(&rtc->lock);
return 0;
}
static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,
int value, int reg_off)
{
/* < 0 for a value that is ignored */
if (value < 0)
writeb(0, rtc->regbase + reg_off);
else
writeb(bin2bcd(value) | AR_ENB, rtc->regbase + reg_off);
}
static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
{
struct sh_rtc *rtc = dev_get_drvdata(dev);
unsigned int rcr1;
struct rtc_time *tm = &wkalrm->time;
int mon;
spin_lock_irq(&rtc->lock);
/* disable alarm interrupt and clear the alarm flag */
rcr1 = readb(rtc->regbase + RCR1);
rcr1 &= ~(RCR1_AF | RCR1_AIE);
writeb(rcr1, rtc->regbase + RCR1);
/* set alarm time */
sh_rtc_write_alarm_value(rtc, tm->tm_sec, RSECAR);
sh_rtc_write_alarm_value(rtc, tm->tm_min, RMINAR);
sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR);
sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR);
sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR);
mon = tm->tm_mon;
if (mon >= 0)
mon += 1;
sh_rtc_write_alarm_value(rtc, mon, RMONAR);
if (wkalrm->enabled) {
rcr1 |= RCR1_AIE;
writeb(rcr1, rtc->regbase + RCR1);
}
spin_unlock_irq(&rtc->lock);
return 0;
}
static const struct rtc_class_ops sh_rtc_ops = {
.read_time = sh_rtc_read_time,
.set_time = sh_rtc_set_time,
.read_alarm = sh_rtc_read_alarm,
.set_alarm = sh_rtc_set_alarm,
.proc = sh_rtc_proc,
.alarm_irq_enable = sh_rtc_alarm_irq_enable,
};
static int __init sh_rtc_probe(struct platform_device *pdev)
{
struct sh_rtc *rtc;
struct resource *res;
char clk_name[6];
int clk_id, ret;
rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
if (unlikely(!rtc))
return -ENOMEM;
spin_lock_init(&rtc->lock);
/* get periodic/carry/alarm irqs */
ret = platform_get_irq(pdev, 0);
if (unlikely(ret <= 0)) {
dev_err(&pdev->dev, "No IRQ resource\n");
return -ENOENT;
}
rtc->periodic_irq = ret;
rtc->carry_irq = platform_get_irq(pdev, 1);
rtc->alarm_irq = platform_get_irq(pdev, 2);
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (!res)
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (unlikely(res == NULL)) {
dev_err(&pdev->dev, "No IO resource\n");
return -ENOENT;
}
rtc->regsize = resource_size(res);
rtc->res = devm_request_mem_region(&pdev->dev, res->start,
rtc->regsize, pdev->name);
if (unlikely(!rtc->res))
return -EBUSY;
rtc->regbase = devm_ioremap_nocache(&pdev->dev, rtc->res->start,
rtc->regsize);
if (unlikely(!rtc->regbase))
return -EINVAL;
if (!pdev->dev.of_node) {
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);
} else
snprintf(clk_name, sizeof(clk_name), "fck");
rtc->clk = devm_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;
}
rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
if (IS_ERR(rtc->rtc_dev))
return PTR_ERR(rtc->rtc_dev);
clk_enable(rtc->clk);
rtc->capabilities = RTC_DEF_CAPABILITIES;
#ifdef CONFIG_SUPERH
if (dev_get_platdata(&pdev->dev)) {
struct sh_rtc_platform_info *pinfo =
dev_get_platdata(&pdev->dev);
/*
* Some CPUs have special capabilities in addition to the
* default set. Add those in here.
*/
rtc->capabilities |= pinfo->capabilities;
}
#endif
if (rtc->carry_irq <= 0) {
/* register shared periodic/carry/alarm irq */
ret = devm_request_irq(&pdev->dev, rtc->periodic_irq,
sh_rtc_shared, 0, "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 = devm_request_irq(&pdev->dev, rtc->periodic_irq,
sh_rtc_periodic, 0, "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 = devm_request_irq(&pdev->dev, rtc->carry_irq,
sh_rtc_interrupt, 0, "sh-rtc carry", rtc);
if (unlikely(ret)) {
dev_err(&pdev->dev,
"request carry IRQ failed with %d, IRQ %d\n",
ret, rtc->carry_irq);
goto err_unmap;
}
ret = devm_request_irq(&pdev->dev, rtc->alarm_irq,
sh_rtc_alarm, 0, "sh-rtc alarm", rtc);
if (unlikely(ret)) {
dev_err(&pdev->dev,
"request alarm IRQ failed with %d, IRQ %d\n",
ret, rtc->alarm_irq);
goto err_unmap;
}
}
platform_set_drvdata(pdev, rtc);
/* everything disabled by default */
sh_rtc_setaie(&pdev->dev, 0);
sh_rtc_setcie(&pdev->dev, 0);
rtc->rtc_dev->ops = &sh_rtc_ops;
rtc->rtc_dev->max_user_freq = 256;
if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
rtc->rtc_dev->range_min = RTC_TIMESTAMP_BEGIN_1900;
rtc->rtc_dev->range_max = RTC_TIMESTAMP_END_9999;
} else {
rtc->rtc_dev->range_min = mktime64(1999, 1, 1, 0, 0, 0);
rtc->rtc_dev->range_max = mktime64(2098, 12, 31, 23, 59, 59);
}
ret = rtc_register_device(rtc->rtc_dev);
if (ret)
goto err_unmap;
device_init_wakeup(&pdev->dev, 1);
return 0;
err_unmap:
clk_disable(rtc->clk);
return ret;
}
static int __exit sh_rtc_remove(struct platform_device *pdev)
{
struct sh_rtc *rtc = platform_get_drvdata(pdev);
sh_rtc_setaie(&pdev->dev, 0);
sh_rtc_setcie(&pdev->dev, 0);
clk_disable(rtc->clk);
return 0;
}
static void sh_rtc_set_irq_wake(struct device *dev, int enabled)
{
struct sh_rtc *rtc = dev_get_drvdata(dev);
irq_set_irq_wake(rtc->periodic_irq, enabled);
if (rtc->carry_irq > 0) {
irq_set_irq_wake(rtc->carry_irq, enabled);
irq_set_irq_wake(rtc->alarm_irq, enabled);
}
}
static int __maybe_unused sh_rtc_suspend(struct device *dev)
{
if (device_may_wakeup(dev))
sh_rtc_set_irq_wake(dev, 1);
return 0;
}
static int __maybe_unused sh_rtc_resume(struct device *dev)
{
if (device_may_wakeup(dev))
sh_rtc_set_irq_wake(dev, 0);
return 0;
}
static SIMPLE_DEV_PM_OPS(sh_rtc_pm_ops, sh_rtc_suspend, sh_rtc_resume);
static const struct of_device_id sh_rtc_of_match[] = {
{ .compatible = "renesas,sh-rtc", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, sh_rtc_of_match);
static struct platform_driver sh_rtc_platform_driver = {
.driver = {
.name = DRV_NAME,
.pm = &sh_rtc_pm_ops,
.of_match_table = sh_rtc_of_match,
},
.remove = __exit_p(sh_rtc_remove),
};
module_platform_driver_probe(sh_rtc_platform_driver, sh_rtc_probe);
MODULE_DESCRIPTION("SuperH on-chip RTC driver");
MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, "
"Jamie Lenehan <lenehan@twibble.org>, "
"Angelo Castello <angelo.castello@st.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRV_NAME);