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