On Fri, 28 Mar 2014 14:56:37 -0600 Loc Ho <lho@xxxxxxx> wrote: Hello, a few notes below: > --- > drivers/rtc/Kconfig | 9 ++ > drivers/rtc/Makefile | 1 + > drivers/rtc/rtc-xgene.c | 278 +++++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 288 insertions(+), 0 deletions(-) > create mode 100644 drivers/rtc/rtc-xgene.c > > diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig > index db933de..4e3a683 100644 > --- a/drivers/rtc/Kconfig > +++ b/drivers/rtc/Kconfig > @@ -1315,6 +1315,15 @@ config RTC_DRV_MOXART > This driver can also be built as a module. If so, the module > will be called rtc-moxart > > +config RTC_DRV_XGENE > + tristate "APM X-Gene RTC" > + help > + If you say yes here you get support for the APM X-Gene SoC real time > + clock. > + > + This driver can also be built as a module, if so, the module > + will be called "rtc-xgene". > + > comment "HID Sensor RTC drivers" > > config RTC_DRV_HID_SENSOR_TIME > diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile > index b427bf7..ceccd46 100644 > --- a/drivers/rtc/Makefile > +++ b/drivers/rtc/Makefile > @@ -134,5 +134,6 @@ obj-$(CONFIG_RTC_DRV_VT8500) += rtc-vt8500.o > obj-$(CONFIG_RTC_DRV_WM831X) += rtc-wm831x.o > obj-$(CONFIG_RTC_DRV_WM8350) += rtc-wm8350.o > obj-$(CONFIG_RTC_DRV_X1205) += rtc-x1205.o > +obj-$(CONFIG_RTC_DRV_XGENE) += rtc-xgene.o > obj-$(CONFIG_RTC_DRV_SIRFSOC) += rtc-sirfsoc.o > obj-$(CONFIG_RTC_DRV_MOXART) += rtc-moxart.o > diff --git a/drivers/rtc/rtc-xgene.c b/drivers/rtc/rtc-xgene.c > new file mode 100644 > index 0000000..61223a5 > --- /dev/null > +++ b/drivers/rtc/rtc-xgene.c > @@ -0,0 +1,278 @@ > +/* > + * APM X-Gene SoC Real Time Clock Driver > + * > + * Copyright (c) 2014, Applied Micro Circuits Corporation > + * Author: Rameshwar Prasad Sahu <rsahu@xxxxxxx> > + * Loc Ho <lho@xxxxxxx> > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms of the GNU General Public License as published by the > + * Free Software Foundation; either version 2 of the License, or (at your > + * option) any later version. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + * You should have received a copy of the GNU General Public License > + * along with this program. If not, see <http://www.gnu.org/licenses/>. > + * > + */ > + > +#include <linux/init.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/io.h> > +#include <linux/slab.h> > +#include <linux/clk.h> > +#include <linux/delay.h> > +#include <linux/rtc.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; > + struct device *dev; > + unsigned long alarm_time; > + void __iomem *csr_base; > + struct clk *clk; > + unsigned int irq_wake; > +}; > + > +static int xgene_rtc_read_time(struct device *dev, struct rtc_time *tm) > +{ > + struct xgene_rtc_dev *pdata = dev_get_drvdata(dev); > + > + rtc_time_to_tm(readl(pdata->csr_base + RTC_CCVR), tm); > + return 0; > +} return rtc_valid_tm(tm); > + > +static int xgene_rtc_set_mmss(struct device *dev, unsigned long secs) > +{ > + 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) secs, 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); > + > + rtc_time_to_tm(pdata->alarm_time, &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_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) > +{ > + struct xgene_rtc_dev *pdata = dev_get_drvdata(dev); > + unsigned long rtc_time; > + unsigned long alarm_time; > + > + rtc_time = readl(pdata->csr_base + RTC_CCVR); > + rtc_tm_to_time(&alrm->time, &alarm_time); > + > + pdata->alarm_time = alarm_time; > + writel((u32) pdata->alarm_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_mmss = xgene_rtc_set_mmss, > + .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 = (struct xgene_rtc_dev *) 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; > + struct resource *res; > + int ret; > + int irq; > + > + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); > + if (!pdata) > + return -ENOMEM; > + platform_set_drvdata(pdev, pdata); > + pdata->dev = &pdev->dev; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + pdata->csr_base = devm_ioremap_resource(&pdev->dev, res); > + if (IS_ERR(pdata->csr_base)) > + return PTR_ERR(pdata->csr_base); > + > + irq = platform_get_irq(pdev, 0); > + if (irq < 0) { > + dev_err(&pdev->dev, "No IRQ resource\n"); > + 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; > + } > + clk_prepare_enable(pdata->clk); > + > + /* Turn on the clock and the crystal */ > + writel(RTC_CCR_EN, pdata->csr_base + RTC_CCR); > + > + device_init_wakeup(&pdev->dev, 1); > + > + pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, > + &xgene_rtc_ops, THIS_MODULE); > + if (IS_ERR(pdata->rtc)) { > + clk_disable_unprepare(pdata->clk); > + return PTR_ERR(pdata->rtc); > + } > + > + /* HW does not support update faster than 1 seconds */ > + pdata->rtc->uie_unsupported = 1; > + > + return 0; > +} > + > +static int 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); > + return 0; > +} > + > +#ifdef CONFIG_PM_SLEEP > +static int 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 (device_may_wakeup(&pdev->dev)) { > + if (!enable_irq_wake(irq)) > + pdata->irq_wake = 1; > + } else { > + xgene_rtc_alarm_irq_enable(dev, 0); > + clk_disable(pdata->clk); > + } > + > + return 0; > +} > + > +static int 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; > + > + 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 { > + clk_enable(pdata->clk); > + xgene_rtc_alarm_irq_enable(dev, 1); > + } > + > + return 0; > +} > +#endif > + > +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 = xgene_rtc_remove, > + .driver = { > + .owner = THIS_MODULE, > + .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@xxxxxxx>"); > +MODULE_LICENSE("GPL"); > -- > 1.5.5 > > -- > -- > You received this message because you are subscribed to "rtc-linux". > Membership options at http://groups.google.com/group/rtc-linux . > Please read http://groups.google.com/group/rtc-linux/web/checklist > before submitting a driver. > --- > You received this message because you are subscribed to the Google Groups "rtc-linux" group. > To unsubscribe from this group and stop receiving emails from it, send an email to rtc-linux+unsubscribe@xxxxxxxxxxxxxxxx. > For more options, visit https://groups.google.com/d/optout. -- Best regards, Alessandro Zummo, Tower Technologies - Torino, Italy http://www.towertech.it -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
