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/*
* 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
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/module.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 <asm/rtc.h>
#define DRV_NAME "sh-rtc"
#define DRV_VERSION "0.2.3"
#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)
{
struct rtc_device *rtc_dev = rtc->rtc_dev;
struct rtc_task *irq_task;
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;
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);
}
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);
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