757 lines
18 KiB
C
757 lines
18 KiB
C
/*
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* SuperH On-Chip RTC Support
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*
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* Copyright (C) 2006 - 2009 Paul Mundt
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* Copyright (C) 2006 Jamie Lenehan
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* Copyright (C) 2008 Angelo Castello
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*
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* Based on the old arch/sh/kernel/cpu/rtc.c by:
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*
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* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
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* Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/bcd.h>
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#include <linux/rtc.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/seq_file.h>
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/io.h>
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#include <linux/log2.h>
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#include <linux/clk.h>
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#include <linux/slab.h>
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#include <asm/rtc.h>
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#define DRV_NAME "sh-rtc"
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#define RTC_REG(r) ((r) * rtc_reg_size)
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#define R64CNT RTC_REG(0)
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#define RSECCNT RTC_REG(1) /* RTC sec */
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#define RMINCNT RTC_REG(2) /* RTC min */
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#define RHRCNT RTC_REG(3) /* RTC hour */
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#define RWKCNT RTC_REG(4) /* RTC week */
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#define RDAYCNT RTC_REG(5) /* RTC day */
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#define RMONCNT RTC_REG(6) /* RTC month */
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#define RYRCNT RTC_REG(7) /* RTC year */
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#define RSECAR RTC_REG(8) /* ALARM sec */
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#define RMINAR RTC_REG(9) /* ALARM min */
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#define RHRAR RTC_REG(10) /* ALARM hour */
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#define RWKAR RTC_REG(11) /* ALARM week */
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#define RDAYAR RTC_REG(12) /* ALARM day */
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#define RMONAR RTC_REG(13) /* ALARM month */
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#define RCR1 RTC_REG(14) /* Control */
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#define RCR2 RTC_REG(15) /* Control */
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/*
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* Note on RYRAR and RCR3: Up until this point most of the register
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* definitions are consistent across all of the available parts. However,
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* the placement of the optional RYRAR and RCR3 (the RYRAR control
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* register used to control RYRCNT/RYRAR compare) varies considerably
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* across various parts, occasionally being mapped in to a completely
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* unrelated address space. For proper RYRAR support a separate resource
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* would have to be handed off, but as this is purely optional in
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* practice, we simply opt not to support it, thereby keeping the code
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* quite a bit more simplified.
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*/
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/* ALARM Bits - or with BCD encoded value */
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#define AR_ENB 0x80 /* Enable for alarm cmp */
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/* Period Bits */
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#define PF_HP 0x100 /* Enable Half Period to support 8,32,128Hz */
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#define PF_COUNT 0x200 /* Half periodic counter */
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#define PF_OXS 0x400 /* Periodic One x Second */
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#define PF_KOU 0x800 /* Kernel or User periodic request 1=kernel */
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#define PF_MASK 0xf00
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/* RCR1 Bits */
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#define RCR1_CF 0x80 /* Carry Flag */
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#define RCR1_CIE 0x10 /* Carry Interrupt Enable */
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#define RCR1_AIE 0x08 /* Alarm Interrupt Enable */
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#define RCR1_AF 0x01 /* Alarm Flag */
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/* RCR2 Bits */
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#define RCR2_PEF 0x80 /* PEriodic interrupt Flag */
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#define RCR2_PESMASK 0x70 /* Periodic interrupt Set */
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#define RCR2_RTCEN 0x08 /* ENable RTC */
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#define RCR2_ADJ 0x04 /* ADJustment (30-second) */
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#define RCR2_RESET 0x02 /* Reset bit */
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#define RCR2_START 0x01 /* Start bit */
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struct sh_rtc {
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void __iomem *regbase;
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unsigned long regsize;
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struct resource *res;
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int alarm_irq;
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int periodic_irq;
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int carry_irq;
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struct clk *clk;
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struct rtc_device *rtc_dev;
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spinlock_t lock;
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unsigned long capabilities; /* See asm/rtc.h for cap bits */
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unsigned short periodic_freq;
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};
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static int __sh_rtc_interrupt(struct sh_rtc *rtc)
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{
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unsigned int tmp, pending;
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tmp = readb(rtc->regbase + RCR1);
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pending = tmp & RCR1_CF;
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tmp &= ~RCR1_CF;
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writeb(tmp, rtc->regbase + RCR1);
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/* Users have requested One x Second IRQ */
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if (pending && rtc->periodic_freq & PF_OXS)
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rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);
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return pending;
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}
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static int __sh_rtc_alarm(struct sh_rtc *rtc)
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{
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unsigned int tmp, pending;
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tmp = readb(rtc->regbase + RCR1);
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pending = tmp & RCR1_AF;
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tmp &= ~(RCR1_AF | RCR1_AIE);
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writeb(tmp, rtc->regbase + RCR1);
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if (pending)
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rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
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return pending;
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}
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static int __sh_rtc_periodic(struct sh_rtc *rtc)
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{
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struct rtc_device *rtc_dev = rtc->rtc_dev;
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struct rtc_task *irq_task;
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unsigned int tmp, pending;
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tmp = readb(rtc->regbase + RCR2);
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pending = tmp & RCR2_PEF;
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tmp &= ~RCR2_PEF;
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writeb(tmp, rtc->regbase + RCR2);
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if (!pending)
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return 0;
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/* Half period enabled than one skipped and the next notified */
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if ((rtc->periodic_freq & PF_HP) && (rtc->periodic_freq & PF_COUNT))
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rtc->periodic_freq &= ~PF_COUNT;
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else {
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if (rtc->periodic_freq & PF_HP)
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rtc->periodic_freq |= PF_COUNT;
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if (rtc->periodic_freq & PF_KOU) {
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spin_lock(&rtc_dev->irq_task_lock);
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irq_task = rtc_dev->irq_task;
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if (irq_task)
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irq_task->func(irq_task->private_data);
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spin_unlock(&rtc_dev->irq_task_lock);
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} else
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rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
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}
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return pending;
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}
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static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
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{
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struct sh_rtc *rtc = dev_id;
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int ret;
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spin_lock(&rtc->lock);
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ret = __sh_rtc_interrupt(rtc);
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spin_unlock(&rtc->lock);
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return IRQ_RETVAL(ret);
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}
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static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
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{
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struct sh_rtc *rtc = dev_id;
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int ret;
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spin_lock(&rtc->lock);
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ret = __sh_rtc_alarm(rtc);
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spin_unlock(&rtc->lock);
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return IRQ_RETVAL(ret);
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}
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static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
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{
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struct sh_rtc *rtc = dev_id;
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int ret;
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spin_lock(&rtc->lock);
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ret = __sh_rtc_periodic(rtc);
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spin_unlock(&rtc->lock);
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return IRQ_RETVAL(ret);
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}
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static irqreturn_t sh_rtc_shared(int irq, void *dev_id)
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{
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struct sh_rtc *rtc = dev_id;
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int ret;
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spin_lock(&rtc->lock);
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ret = __sh_rtc_interrupt(rtc);
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ret |= __sh_rtc_alarm(rtc);
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ret |= __sh_rtc_periodic(rtc);
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spin_unlock(&rtc->lock);
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return IRQ_RETVAL(ret);
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}
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static int sh_rtc_irq_set_state(struct device *dev, int enable)
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{
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struct sh_rtc *rtc = dev_get_drvdata(dev);
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unsigned int tmp;
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spin_lock_irq(&rtc->lock);
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tmp = readb(rtc->regbase + RCR2);
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if (enable) {
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rtc->periodic_freq |= PF_KOU;
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tmp &= ~RCR2_PEF; /* Clear PES bit */
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tmp |= (rtc->periodic_freq & ~PF_HP); /* Set PES2-0 */
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} else {
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rtc->periodic_freq &= ~PF_KOU;
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tmp &= ~(RCR2_PESMASK | RCR2_PEF);
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}
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writeb(tmp, rtc->regbase + RCR2);
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spin_unlock_irq(&rtc->lock);
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return 0;
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}
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static int sh_rtc_irq_set_freq(struct device *dev, int freq)
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{
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struct sh_rtc *rtc = dev_get_drvdata(dev);
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int tmp, ret = 0;
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spin_lock_irq(&rtc->lock);
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tmp = rtc->periodic_freq & PF_MASK;
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switch (freq) {
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case 0:
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rtc->periodic_freq = 0x00;
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break;
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case 1:
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rtc->periodic_freq = 0x60;
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break;
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case 2:
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rtc->periodic_freq = 0x50;
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break;
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case 4:
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rtc->periodic_freq = 0x40;
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break;
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case 8:
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rtc->periodic_freq = 0x30 | PF_HP;
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break;
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case 16:
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rtc->periodic_freq = 0x30;
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break;
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case 32:
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rtc->periodic_freq = 0x20 | PF_HP;
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break;
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case 64:
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rtc->periodic_freq = 0x20;
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break;
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case 128:
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rtc->periodic_freq = 0x10 | PF_HP;
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break;
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case 256:
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rtc->periodic_freq = 0x10;
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break;
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default:
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ret = -ENOTSUPP;
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}
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if (ret == 0)
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rtc->periodic_freq |= tmp;
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spin_unlock_irq(&rtc->lock);
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return ret;
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}
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static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
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{
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struct sh_rtc *rtc = dev_get_drvdata(dev);
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unsigned int tmp;
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spin_lock_irq(&rtc->lock);
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tmp = readb(rtc->regbase + RCR1);
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if (enable)
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tmp |= RCR1_AIE;
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else
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tmp &= ~RCR1_AIE;
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writeb(tmp, rtc->regbase + RCR1);
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spin_unlock_irq(&rtc->lock);
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}
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static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
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{
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struct sh_rtc *rtc = dev_get_drvdata(dev);
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unsigned int tmp;
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tmp = readb(rtc->regbase + RCR1);
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seq_printf(seq, "carry_IRQ\t: %s\n", (tmp & RCR1_CIE) ? "yes" : "no");
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tmp = readb(rtc->regbase + RCR2);
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seq_printf(seq, "periodic_IRQ\t: %s\n",
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(tmp & RCR2_PESMASK) ? "yes" : "no");
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return 0;
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}
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static inline void sh_rtc_setcie(struct device *dev, unsigned int enable)
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{
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struct sh_rtc *rtc = dev_get_drvdata(dev);
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unsigned int tmp;
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spin_lock_irq(&rtc->lock);
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tmp = readb(rtc->regbase + RCR1);
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if (!enable)
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tmp &= ~RCR1_CIE;
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else
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tmp |= RCR1_CIE;
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writeb(tmp, rtc->regbase + RCR1);
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spin_unlock_irq(&rtc->lock);
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}
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static int sh_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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sh_rtc_setaie(dev, enabled);
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return 0;
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}
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static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct sh_rtc *rtc = platform_get_drvdata(pdev);
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unsigned int sec128, sec2, yr, yr100, cf_bit;
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do {
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unsigned int tmp;
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spin_lock_irq(&rtc->lock);
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tmp = readb(rtc->regbase + RCR1);
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tmp &= ~RCR1_CF; /* Clear CF-bit */
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tmp |= RCR1_CIE;
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writeb(tmp, rtc->regbase + RCR1);
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sec128 = readb(rtc->regbase + R64CNT);
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tm->tm_sec = bcd2bin(readb(rtc->regbase + RSECCNT));
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tm->tm_min = bcd2bin(readb(rtc->regbase + RMINCNT));
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tm->tm_hour = bcd2bin(readb(rtc->regbase + RHRCNT));
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tm->tm_wday = bcd2bin(readb(rtc->regbase + RWKCNT));
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tm->tm_mday = bcd2bin(readb(rtc->regbase + RDAYCNT));
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tm->tm_mon = bcd2bin(readb(rtc->regbase + RMONCNT)) - 1;
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if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
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yr = readw(rtc->regbase + RYRCNT);
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yr100 = bcd2bin(yr >> 8);
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yr &= 0xff;
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} else {
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yr = readb(rtc->regbase + RYRCNT);
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yr100 = bcd2bin((yr == 0x99) ? 0x19 : 0x20);
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}
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tm->tm_year = (yr100 * 100 + bcd2bin(yr)) - 1900;
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sec2 = readb(rtc->regbase + R64CNT);
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cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
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spin_unlock_irq(&rtc->lock);
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} while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
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#if RTC_BIT_INVERTED != 0
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if ((sec128 & RTC_BIT_INVERTED))
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tm->tm_sec--;
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#endif
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/* only keep the carry interrupt enabled if UIE is on */
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if (!(rtc->periodic_freq & PF_OXS))
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sh_rtc_setcie(dev, 0);
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dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
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"mday=%d, mon=%d, year=%d, wday=%d\n",
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__func__,
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tm->tm_sec, tm->tm_min, tm->tm_hour,
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tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
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return rtc_valid_tm(tm);
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}
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static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct sh_rtc *rtc = platform_get_drvdata(pdev);
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unsigned int tmp;
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int year;
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spin_lock_irq(&rtc->lock);
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/* Reset pre-scaler & stop RTC */
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tmp = readb(rtc->regbase + RCR2);
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tmp |= RCR2_RESET;
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tmp &= ~RCR2_START;
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writeb(tmp, rtc->regbase + RCR2);
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writeb(bin2bcd(tm->tm_sec), rtc->regbase + RSECCNT);
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writeb(bin2bcd(tm->tm_min), rtc->regbase + RMINCNT);
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writeb(bin2bcd(tm->tm_hour), rtc->regbase + RHRCNT);
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writeb(bin2bcd(tm->tm_wday), rtc->regbase + RWKCNT);
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writeb(bin2bcd(tm->tm_mday), rtc->regbase + RDAYCNT);
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writeb(bin2bcd(tm->tm_mon + 1), rtc->regbase + RMONCNT);
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if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
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year = (bin2bcd((tm->tm_year + 1900) / 100) << 8) |
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bin2bcd(tm->tm_year % 100);
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writew(year, rtc->regbase + RYRCNT);
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} else {
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year = tm->tm_year % 100;
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writeb(bin2bcd(year), rtc->regbase + RYRCNT);
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}
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/* Start RTC */
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tmp = readb(rtc->regbase + RCR2);
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tmp &= ~RCR2_RESET;
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tmp |= RCR2_RTCEN | RCR2_START;
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writeb(tmp, rtc->regbase + RCR2);
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spin_unlock_irq(&rtc->lock);
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return 0;
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}
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static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)
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{
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unsigned int byte;
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int value = -1; /* return -1 for ignored values */
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byte = readb(rtc->regbase + reg_off);
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if (byte & AR_ENB) {
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byte &= ~AR_ENB; /* strip the enable bit */
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value = bcd2bin(byte);
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}
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return value;
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}
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static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct sh_rtc *rtc = platform_get_drvdata(pdev);
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struct rtc_time *tm = &wkalrm->time;
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spin_lock_irq(&rtc->lock);
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tm->tm_sec = sh_rtc_read_alarm_value(rtc, RSECAR);
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tm->tm_min = sh_rtc_read_alarm_value(rtc, RMINAR);
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tm->tm_hour = sh_rtc_read_alarm_value(rtc, RHRAR);
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tm->tm_wday = sh_rtc_read_alarm_value(rtc, RWKAR);
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tm->tm_mday = sh_rtc_read_alarm_value(rtc, RDAYAR);
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tm->tm_mon = sh_rtc_read_alarm_value(rtc, RMONAR);
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if (tm->tm_mon > 0)
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tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
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wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;
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spin_unlock_irq(&rtc->lock);
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return 0;
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}
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static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,
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int value, int reg_off)
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{
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/* < 0 for a value that is ignored */
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if (value < 0)
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writeb(0, rtc->regbase + reg_off);
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else
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writeb(bin2bcd(value) | AR_ENB, rtc->regbase + reg_off);
|
|
}
|
|
|
|
static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct sh_rtc *rtc = platform_get_drvdata(pdev);
|
|
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 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;
|
|
struct rtc_time r;
|
|
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 (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;
|
|
|
|
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 = 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;
|
|
}
|
|
|
|
clk_enable(rtc->clk);
|
|
|
|
rtc->capabilities = RTC_DEF_CAPABILITIES;
|
|
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;
|
|
}
|
|
|
|
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_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 = devm_rtc_device_register(&pdev->dev, "sh",
|
|
&sh_rtc_ops, THIS_MODULE);
|
|
if (IS_ERR(rtc->rtc_dev)) {
|
|
ret = PTR_ERR(rtc->rtc_dev);
|
|
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);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __exit sh_rtc_remove(struct platform_device *pdev)
|
|
{
|
|
struct sh_rtc *rtc = platform_get_drvdata(pdev);
|
|
|
|
sh_rtc_irq_set_state(&pdev->dev, 0);
|
|
|
|
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 platform_device *pdev = to_platform_device(dev);
|
|
struct sh_rtc *rtc = platform_get_drvdata(pdev);
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
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;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(sh_rtc_pm_ops, sh_rtc_suspend, sh_rtc_resume);
|
|
|
|
static struct platform_driver sh_rtc_platform_driver = {
|
|
.driver = {
|
|
.name = DRV_NAME,
|
|
.pm = &sh_rtc_pm_ops,
|
|
},
|
|
.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");
|
|
MODULE_ALIAS("platform:" DRV_NAME);
|