| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Loc Ho | 1151 | 94.11% | 2 | 14.29% |
| Alexandre Belloni | 65 | 5.31% | 8 | 57.14% |
| Uwe Kleine-König | 2 | 0.16% | 1 | 7.14% |
| Arnd Bergmann | 2 | 0.16% | 1 | 7.14% |
| Yue haibing | 2 | 0.16% | 1 | 7.14% |
| Bartosz Golaszewski | 1 | 0.08% | 1 | 7.14% |
| Total | 1223 | 14 |
// SPDX-License-Identifier: GPL-2.0+ /* * APM X-Gene SoC Real Time Clock Driver * * Copyright (c) 2014, Applied Micro Circuits Corporation * Author: Rameshwar Prasad Sahu <rsahu@apm.com> * Loc Ho <lho@apm.com> */ #include <linux/clk.h> #include <linux/delay.h> #include <linux/init.h> #include <linux/io.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/rtc.h> #include <linux/slab.h> /* RTC CSR Registers */ #define RTC_CCVR 0x00 #define RTC_CMR 0x04 #define RTC_CLR 0x08 #define RTC_CCR 0x0C #define RTC_CCR_IE BIT(0) #define RTC_CCR_MASK BIT(1) #define RTC_CCR_EN BIT(2) #define RTC_CCR_WEN BIT(3) #define RTC_STAT 0x10 #define RTC_STAT_BIT BIT(0) #define RTC_RSTAT 0x14 #define RTC_EOI 0x18 #define RTC_VER 0x1C struct xgene_rtc_dev { struct rtc_device *rtc; void __iomem *csr_base; struct clk *clk; unsigned int irq_wake; unsigned int irq_enabled; }; static int xgene_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct xgene_rtc_dev *pdata = dev_get_drvdata(dev); rtc_time64_to_tm(readl(pdata->csr_base + RTC_CCVR), tm); return 0; } static int xgene_rtc_set_time(struct device *dev, struct rtc_time *tm) { struct xgene_rtc_dev *pdata = dev_get_drvdata(dev); /* * NOTE: After the following write, the RTC_CCVR is only reflected * after the update cycle of 1 seconds. */ writel((u32)rtc_tm_to_time64(tm), pdata->csr_base + RTC_CLR); readl(pdata->csr_base + RTC_CLR); /* Force a barrier */ return 0; } static int xgene_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) { struct xgene_rtc_dev *pdata = dev_get_drvdata(dev); /* If possible, CMR should be read here */ rtc_time64_to_tm(0, &alrm->time); alrm->enabled = readl(pdata->csr_base + RTC_CCR) & RTC_CCR_IE; return 0; } static int xgene_rtc_alarm_irq_enable(struct device *dev, u32 enabled) { struct xgene_rtc_dev *pdata = dev_get_drvdata(dev); u32 ccr; ccr = readl(pdata->csr_base + RTC_CCR); if (enabled) { ccr &= ~RTC_CCR_MASK; ccr |= RTC_CCR_IE; } else { ccr &= ~RTC_CCR_IE; ccr |= RTC_CCR_MASK; } writel(ccr, pdata->csr_base + RTC_CCR); return 0; } static int xgene_rtc_alarm_irq_enabled(struct device *dev) { struct xgene_rtc_dev *pdata = dev_get_drvdata(dev); return readl(pdata->csr_base + RTC_CCR) & RTC_CCR_IE ? 1 : 0; } static int xgene_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) { struct xgene_rtc_dev *pdata = dev_get_drvdata(dev); writel((u32)rtc_tm_to_time64(&alrm->time), pdata->csr_base + RTC_CMR); xgene_rtc_alarm_irq_enable(dev, alrm->enabled); return 0; } static const struct rtc_class_ops xgene_rtc_ops = { .read_time = xgene_rtc_read_time, .set_time = xgene_rtc_set_time, .read_alarm = xgene_rtc_read_alarm, .set_alarm = xgene_rtc_set_alarm, .alarm_irq_enable = xgene_rtc_alarm_irq_enable, }; static irqreturn_t xgene_rtc_interrupt(int irq, void *id) { struct xgene_rtc_dev *pdata = id; /* Check if interrupt asserted */ if (!(readl(pdata->csr_base + RTC_STAT) & RTC_STAT_BIT)) return IRQ_NONE; /* Clear interrupt */ readl(pdata->csr_base + RTC_EOI); rtc_update_irq(pdata->rtc, 1, RTC_IRQF | RTC_AF); return IRQ_HANDLED; } static int xgene_rtc_probe(struct platform_device *pdev) { struct xgene_rtc_dev *pdata; int ret; int irq; pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return -ENOMEM; platform_set_drvdata(pdev, pdata); pdata->csr_base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(pdata->csr_base)) return PTR_ERR(pdata->csr_base); pdata->rtc = devm_rtc_allocate_device(&pdev->dev); if (IS_ERR(pdata->rtc)) return PTR_ERR(pdata->rtc); irq = platform_get_irq(pdev, 0); if (irq < 0) return irq; ret = devm_request_irq(&pdev->dev, irq, xgene_rtc_interrupt, 0, dev_name(&pdev->dev), pdata); if (ret) { dev_err(&pdev->dev, "Could not request IRQ\n"); return ret; } pdata->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(pdata->clk)) { dev_err(&pdev->dev, "Couldn't get the clock for RTC\n"); return -ENODEV; } ret = clk_prepare_enable(pdata->clk); if (ret) return ret; /* Turn on the clock and the crystal */ writel(RTC_CCR_EN, pdata->csr_base + RTC_CCR); ret = device_init_wakeup(&pdev->dev, 1); if (ret) { clk_disable_unprepare(pdata->clk); return ret; } pdata->rtc->ops = &xgene_rtc_ops; pdata->rtc->range_max = U32_MAX; ret = devm_rtc_register_device(pdata->rtc); if (ret) { clk_disable_unprepare(pdata->clk); return ret; } return 0; } static void xgene_rtc_remove(struct platform_device *pdev) { struct xgene_rtc_dev *pdata = platform_get_drvdata(pdev); xgene_rtc_alarm_irq_enable(&pdev->dev, 0); device_init_wakeup(&pdev->dev, 0); clk_disable_unprepare(pdata->clk); } static int __maybe_unused xgene_rtc_suspend(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct xgene_rtc_dev *pdata = platform_get_drvdata(pdev); int irq; irq = platform_get_irq(pdev, 0); /* * If this RTC alarm will be used for waking the system up, * don't disable it of course. Else we just disable the alarm * and await suspension. */ if (device_may_wakeup(&pdev->dev)) { if (!enable_irq_wake(irq)) pdata->irq_wake = 1; } else { pdata->irq_enabled = xgene_rtc_alarm_irq_enabled(dev); xgene_rtc_alarm_irq_enable(dev, 0); clk_disable_unprepare(pdata->clk); } return 0; } static int __maybe_unused xgene_rtc_resume(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct xgene_rtc_dev *pdata = platform_get_drvdata(pdev); int irq; int rc; irq = platform_get_irq(pdev, 0); if (device_may_wakeup(&pdev->dev)) { if (pdata->irq_wake) { disable_irq_wake(irq); pdata->irq_wake = 0; } } else { rc = clk_prepare_enable(pdata->clk); if (rc) { dev_err(dev, "Unable to enable clock error %d\n", rc); return rc; } xgene_rtc_alarm_irq_enable(dev, pdata->irq_enabled); } return 0; } static SIMPLE_DEV_PM_OPS(xgene_rtc_pm_ops, xgene_rtc_suspend, xgene_rtc_resume); #ifdef CONFIG_OF static const struct of_device_id xgene_rtc_of_match[] = { {.compatible = "apm,xgene-rtc" }, { } }; MODULE_DEVICE_TABLE(of, xgene_rtc_of_match); #endif static struct platform_driver xgene_rtc_driver = { .probe = xgene_rtc_probe, .remove_new = xgene_rtc_remove, .driver = { .name = "xgene-rtc", .pm = &xgene_rtc_pm_ops, .of_match_table = of_match_ptr(xgene_rtc_of_match), }, }; module_platform_driver(xgene_rtc_driver); MODULE_DESCRIPTION("APM X-Gene SoC RTC driver"); MODULE_AUTHOR("Rameshwar Sahu <rsahu@apm.com>"); MODULE_LICENSE("GPL");
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