mirror of https://gitee.com/openkylin/linux.git
468 lines
11 KiB
C
468 lines
11 KiB
C
/*
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* SuperH On-Chip RTC Support
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*
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* Copyright (C) 2006 Paul Mundt
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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 <asm/io.h>
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#ifdef CONFIG_CPU_SH3
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#define rtc_reg_size sizeof(u16)
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#define RTC_BIT_INVERTED 0 /* No bug on SH7708, SH7709A */
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#elif defined(CONFIG_CPU_SH4)
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#define rtc_reg_size sizeof(u32)
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#define RTC_BIT_INVERTED 0x40 /* bug on SH7750, SH7750S */
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#endif
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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)
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#define RMINCNT RTC_REG(2)
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#define RHRCNT RTC_REG(3)
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#define RWKCNT RTC_REG(4)
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#define RDAYCNT RTC_REG(5)
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#define RMONCNT RTC_REG(6)
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#define RYRCNT RTC_REG(7)
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#define RSECAR RTC_REG(8)
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#define RMINAR RTC_REG(9)
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#define RHRAR RTC_REG(10)
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#define RWKAR RTC_REG(11)
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#define RDAYAR RTC_REG(12)
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#define RMONAR RTC_REG(13)
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#define RCR1 RTC_REG(14)
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#define RCR2 RTC_REG(15)
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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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unsigned int alarm_irq, periodic_irq, carry_irq;
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struct rtc_device *rtc_dev;
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spinlock_t lock;
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};
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static irqreturn_t sh_rtc_interrupt(int irq, void *id, struct pt_regs *regs)
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{
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struct platform_device *pdev = id;
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struct sh_rtc *rtc = platform_get_drvdata(pdev);
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unsigned int tmp, events = 0;
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spin_lock(&rtc->lock);
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tmp = readb(rtc->regbase + RCR1);
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if (tmp & RCR1_AF)
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events |= RTC_AF | RTC_IRQF;
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tmp &= ~(RCR1_CF | RCR1_AF);
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writeb(tmp, rtc->regbase + RCR1);
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rtc_update_irq(&rtc->rtc_dev->class_dev, 1, events);
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spin_unlock(&rtc->lock);
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return IRQ_HANDLED;
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}
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static irqreturn_t sh_rtc_periodic(int irq, void *id, struct pt_regs *regs)
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{
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struct sh_rtc *rtc = dev_get_drvdata(id);
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spin_lock(&rtc->lock);
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rtc_update_irq(&rtc->rtc_dev->class_dev, 1, RTC_PF | RTC_IRQF);
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spin_unlock(&rtc->lock);
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return IRQ_HANDLED;
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}
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static inline void sh_rtc_setpie(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 + RCR2);
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if (enable) {
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tmp &= ~RCR2_PESMASK;
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tmp |= RCR2_PEF | (2 << 4);
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} else
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tmp &= ~(RCR2_PESMASK | RCR2_PEF);
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writeb(tmp, rtc->regbase + RCR2);
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spin_unlock_irq(&rtc->lock);
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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_open(struct device *dev)
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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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int ret;
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tmp = readb(rtc->regbase + RCR1);
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tmp &= ~RCR1_CF;
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tmp |= RCR1_CIE;
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writeb(tmp, rtc->regbase + RCR1);
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ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, SA_INTERRUPT,
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"sh-rtc period", dev);
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if (unlikely(ret)) {
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dev_err(dev, "request period IRQ failed with %d, IRQ %d\n",
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ret, rtc->periodic_irq);
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return ret;
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}
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ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, SA_INTERRUPT,
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"sh-rtc carry", dev);
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if (unlikely(ret)) {
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dev_err(dev, "request carry IRQ failed with %d, IRQ %d\n",
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ret, rtc->carry_irq);
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free_irq(rtc->periodic_irq, dev);
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goto err_bad_carry;
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}
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ret = request_irq(rtc->alarm_irq, sh_rtc_interrupt, SA_INTERRUPT,
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"sh-rtc alarm", dev);
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if (unlikely(ret)) {
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dev_err(dev, "request alarm IRQ failed with %d, IRQ %d\n",
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ret, rtc->alarm_irq);
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goto err_bad_alarm;
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}
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return 0;
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err_bad_alarm:
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free_irq(rtc->carry_irq, dev);
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err_bad_carry:
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free_irq(rtc->periodic_irq, dev);
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return ret;
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}
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static void sh_rtc_release(struct device *dev)
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{
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struct sh_rtc *rtc = dev_get_drvdata(dev);
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sh_rtc_setpie(dev, 0);
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free_irq(rtc->periodic_irq, dev);
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free_irq(rtc->carry_irq, dev);
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free_irq(rtc->alarm_irq, dev);
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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, "alarm_IRQ\t: %s\n",
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(tmp & RCR1_AIE) ? "yes" : "no");
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seq_printf(seq, "carry_IRQ\t: %s\n",
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(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_PEF) ? "yes" : "no");
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return 0;
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}
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static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
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{
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unsigned int ret = -ENOIOCTLCMD;
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switch (cmd) {
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case RTC_PIE_OFF:
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case RTC_PIE_ON:
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sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
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ret = 0;
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break;
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case RTC_AIE_OFF:
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case RTC_AIE_ON:
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sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
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ret = 0;
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break;
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}
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return ret;
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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));
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#if defined(CONFIG_CPU_SH4)
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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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#endif
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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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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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__FUNCTION__,
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tm->tm_sec, tm->tm_min, tm->tm_hour,
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tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
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if (rtc_valid_tm(tm) < 0)
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dev_err(dev, "invalid date\n");
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return 0;
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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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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), rtc->regbase + RMONCNT);
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#ifdef CONFIG_CPU_SH3
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year = tm->tm_year % 100;
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writeb(BIN2BCD(year), rtc->regbase + RYRCNT);
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#else
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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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#endif
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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 struct rtc_class_ops sh_rtc_ops = {
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.open = sh_rtc_open,
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.release = sh_rtc_release,
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.ioctl = sh_rtc_ioctl,
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.read_time = sh_rtc_read_time,
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.set_time = sh_rtc_set_time,
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.proc = sh_rtc_proc,
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};
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static int __devinit sh_rtc_probe(struct platform_device *pdev)
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{
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struct sh_rtc *rtc;
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struct resource *res;
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int ret = -ENOENT;
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rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
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if (unlikely(!rtc))
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return -ENOMEM;
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spin_lock_init(&rtc->lock);
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rtc->periodic_irq = platform_get_irq(pdev, 0);
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if (unlikely(rtc->periodic_irq < 0)) {
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dev_err(&pdev->dev, "No IRQ for period\n");
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goto err_badres;
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}
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rtc->carry_irq = platform_get_irq(pdev, 1);
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if (unlikely(rtc->carry_irq < 0)) {
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dev_err(&pdev->dev, "No IRQ for carry\n");
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goto err_badres;
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}
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rtc->alarm_irq = platform_get_irq(pdev, 2);
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if (unlikely(rtc->alarm_irq < 0)) {
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dev_err(&pdev->dev, "No IRQ for alarm\n");
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goto err_badres;
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}
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res = platform_get_resource(pdev, IORESOURCE_IO, 0);
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if (unlikely(res == NULL)) {
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dev_err(&pdev->dev, "No IO resource\n");
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goto err_badres;
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}
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rtc->regsize = res->end - res->start + 1;
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rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
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if (unlikely(!rtc->res)) {
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ret = -EBUSY;
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goto err_badres;
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}
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rtc->regbase = (void __iomem *)rtc->res->start;
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if (unlikely(!rtc->regbase)) {
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ret = -EINVAL;
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goto err_badmap;
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}
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rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
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&sh_rtc_ops, THIS_MODULE);
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if (IS_ERR(rtc)) {
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ret = PTR_ERR(rtc->rtc_dev);
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goto err_badmap;
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}
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platform_set_drvdata(pdev, rtc);
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return 0;
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err_badmap:
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release_resource(rtc->res);
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err_badres:
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kfree(rtc);
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return ret;
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}
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static int __devexit sh_rtc_remove(struct platform_device *pdev)
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{
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struct sh_rtc *rtc = platform_get_drvdata(pdev);
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if (likely(rtc->rtc_dev))
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rtc_device_unregister(rtc->rtc_dev);
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sh_rtc_setpie(&pdev->dev, 0);
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sh_rtc_setaie(&pdev->dev, 0);
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release_resource(rtc->res);
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platform_set_drvdata(pdev, NULL);
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kfree(rtc);
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return 0;
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}
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static struct platform_driver sh_rtc_platform_driver = {
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.driver = {
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.name = "sh-rtc",
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.owner = THIS_MODULE,
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},
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.probe = sh_rtc_probe,
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.remove = __devexit_p(sh_rtc_remove),
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};
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static int __init sh_rtc_init(void)
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{
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return platform_driver_register(&sh_rtc_platform_driver);
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}
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static void __exit sh_rtc_exit(void)
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{
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platform_driver_unregister(&sh_rtc_platform_driver);
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}
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module_init(sh_rtc_init);
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module_exit(sh_rtc_exit);
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MODULE_DESCRIPTION("SuperH on-chip RTC driver");
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MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>");
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MODULE_LICENSE("GPL");
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