287 lines
6.2 KiB
C
287 lines
6.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* RTC driver code specific to PKUnity SoC and UniCore ISA
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*
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* Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
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* Copyright (C) 2001-2010 Guan Xuetao
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/rtc.h>
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#include <linux/bcd.h>
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#include <linux/clk.h>
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#include <linux/log2.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <asm/irq.h>
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#include <mach/hardware.h>
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static struct resource *puv3_rtc_mem;
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static int puv3_rtc_alarmno = IRQ_RTCAlarm;
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static int puv3_rtc_tickno = IRQ_RTC;
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static DEFINE_SPINLOCK(puv3_rtc_pie_lock);
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/* IRQ Handlers */
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static irqreturn_t puv3_rtc_alarmirq(int irq, void *id)
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{
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struct rtc_device *rdev = id;
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writel(readl(RTC_RTSR) | RTC_RTSR_AL, RTC_RTSR);
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rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
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return IRQ_HANDLED;
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}
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static irqreturn_t puv3_rtc_tickirq(int irq, void *id)
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{
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struct rtc_device *rdev = id;
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writel(readl(RTC_RTSR) | RTC_RTSR_HZ, RTC_RTSR);
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rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
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return IRQ_HANDLED;
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}
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/* Update control registers */
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static void puv3_rtc_setaie(struct device *dev, int to)
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{
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unsigned int tmp;
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dev_dbg(dev, "%s: aie=%d\n", __func__, to);
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tmp = readl(RTC_RTSR) & ~RTC_RTSR_ALE;
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if (to)
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tmp |= RTC_RTSR_ALE;
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writel(tmp, RTC_RTSR);
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}
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static int puv3_rtc_setpie(struct device *dev, int enabled)
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{
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unsigned int tmp;
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dev_dbg(dev, "%s: pie=%d\n", __func__, enabled);
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spin_lock_irq(&puv3_rtc_pie_lock);
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tmp = readl(RTC_RTSR) & ~RTC_RTSR_HZE;
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if (enabled)
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tmp |= RTC_RTSR_HZE;
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writel(tmp, RTC_RTSR);
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spin_unlock_irq(&puv3_rtc_pie_lock);
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return 0;
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}
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/* Time read/write */
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static int puv3_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
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{
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rtc_time64_to_tm(readl(RTC_RCNR), rtc_tm);
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dev_dbg(dev, "read time %ptRr\n", rtc_tm);
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return 0;
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}
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static int puv3_rtc_settime(struct device *dev, struct rtc_time *tm)
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{
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dev_dbg(dev, "set time %ptRr\n", tm);
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writel(rtc_tm_to_time64(tm), RTC_RCNR);
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return 0;
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}
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static int puv3_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct rtc_time *alm_tm = &alrm->time;
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rtc_time64_to_tm(readl(RTC_RTAR), alm_tm);
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alrm->enabled = readl(RTC_RTSR) & RTC_RTSR_ALE;
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dev_dbg(dev, "read alarm: %d, %ptRr\n", alrm->enabled, alm_tm);
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return 0;
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}
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static int puv3_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct rtc_time *tm = &alrm->time;
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dev_dbg(dev, "set alarm: %d, %ptRr\n", alrm->enabled, tm);
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writel(rtc_tm_to_time64(tm), RTC_RTAR);
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puv3_rtc_setaie(dev, alrm->enabled);
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if (alrm->enabled)
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enable_irq_wake(puv3_rtc_alarmno);
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else
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disable_irq_wake(puv3_rtc_alarmno);
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return 0;
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}
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static int puv3_rtc_proc(struct device *dev, struct seq_file *seq)
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{
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seq_printf(seq, "periodic_IRQ\t: %s\n",
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(readl(RTC_RTSR) & RTC_RTSR_HZE) ? "yes" : "no");
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return 0;
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}
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static const struct rtc_class_ops puv3_rtcops = {
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.read_time = puv3_rtc_gettime,
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.set_time = puv3_rtc_settime,
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.read_alarm = puv3_rtc_getalarm,
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.set_alarm = puv3_rtc_setalarm,
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.proc = puv3_rtc_proc,
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};
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static void puv3_rtc_enable(struct device *dev, int en)
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{
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if (!en) {
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writel(readl(RTC_RTSR) & ~RTC_RTSR_HZE, RTC_RTSR);
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} else {
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/* re-enable the device, and check it is ok */
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if ((readl(RTC_RTSR) & RTC_RTSR_HZE) == 0) {
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dev_info(dev, "rtc disabled, re-enabling\n");
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writel(readl(RTC_RTSR) | RTC_RTSR_HZE, RTC_RTSR);
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}
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}
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}
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static int puv3_rtc_remove(struct platform_device *dev)
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{
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puv3_rtc_setpie(&dev->dev, 0);
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puv3_rtc_setaie(&dev->dev, 0);
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release_resource(puv3_rtc_mem);
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kfree(puv3_rtc_mem);
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return 0;
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}
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static int puv3_rtc_probe(struct platform_device *pdev)
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{
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struct rtc_device *rtc;
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struct resource *res;
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int ret;
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dev_dbg(&pdev->dev, "%s: probe=%p\n", __func__, pdev);
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/* find the IRQs */
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puv3_rtc_tickno = platform_get_irq(pdev, 1);
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if (puv3_rtc_tickno < 0)
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return -ENOENT;
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puv3_rtc_alarmno = platform_get_irq(pdev, 0);
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if (puv3_rtc_alarmno < 0)
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return -ENOENT;
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dev_dbg(&pdev->dev, "PKUnity_rtc: tick irq %d, alarm irq %d\n",
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puv3_rtc_tickno, puv3_rtc_alarmno);
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rtc = devm_rtc_allocate_device(&pdev->dev);
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if (IS_ERR(rtc))
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return PTR_ERR(rtc);
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ret = devm_request_irq(&pdev->dev, puv3_rtc_alarmno, puv3_rtc_alarmirq,
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0, "pkunity-rtc alarm", rtc);
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if (ret) {
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dev_err(&pdev->dev, "IRQ%d error %d\n", puv3_rtc_alarmno, ret);
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return ret;
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}
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ret = devm_request_irq(&pdev->dev, puv3_rtc_tickno, puv3_rtc_tickirq,
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0, "pkunity-rtc tick", rtc);
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if (ret) {
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dev_err(&pdev->dev, "IRQ%d error %d\n", puv3_rtc_tickno, ret);
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return ret;
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}
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/* get the memory region */
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (res == NULL) {
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dev_err(&pdev->dev, "failed to get memory region resource\n");
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return -ENOENT;
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}
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puv3_rtc_mem = request_mem_region(res->start, resource_size(res),
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pdev->name);
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if (puv3_rtc_mem == NULL) {
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dev_err(&pdev->dev, "failed to reserve memory region\n");
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ret = -ENOENT;
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goto err_nores;
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}
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puv3_rtc_enable(&pdev->dev, 1);
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/* register RTC and exit */
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rtc->ops = &puv3_rtcops;
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rtc->range_max = U32_MAX;
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ret = rtc_register_device(rtc);
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if (ret)
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goto err_nortc;
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/* platform setup code should have handled this; sigh */
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if (!device_can_wakeup(&pdev->dev))
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device_init_wakeup(&pdev->dev, 1);
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platform_set_drvdata(pdev, rtc);
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return 0;
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err_nortc:
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puv3_rtc_enable(&pdev->dev, 0);
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release_resource(puv3_rtc_mem);
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err_nores:
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return ret;
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}
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#ifdef CONFIG_PM_SLEEP
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static int ticnt_save;
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static int puv3_rtc_suspend(struct device *dev)
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{
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/* save RTAR for anyone using periodic interrupts */
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ticnt_save = readl(RTC_RTAR);
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puv3_rtc_enable(dev, 0);
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return 0;
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}
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static int puv3_rtc_resume(struct device *dev)
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{
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puv3_rtc_enable(dev, 1);
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writel(ticnt_save, RTC_RTAR);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(puv3_rtc_pm_ops, puv3_rtc_suspend, puv3_rtc_resume);
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static struct platform_driver puv3_rtc_driver = {
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.probe = puv3_rtc_probe,
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.remove = puv3_rtc_remove,
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.driver = {
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.name = "PKUnity-v3-RTC",
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.pm = &puv3_rtc_pm_ops,
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}
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};
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module_platform_driver(puv3_rtc_driver);
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MODULE_DESCRIPTION("RTC Driver for the PKUnity v3 chip");
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MODULE_AUTHOR("Hu Dongliang");
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MODULE_LICENSE("GPL v2");
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