[RTC] rtc-pl030: add driver, remove old non-rtc lib driver
Convert Integrator PL030 RTC driver to use the RTC class interfaces. Acked-by: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>hifive-unleashed-5.1
Russell King
Russell King
parent
2dba8518b7
commit
a190901c6b
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@ -4,7 +4,7 @@
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# Object file lists.
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obj-y := clock.o core.o lm.o time.o
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obj-y := clock.o core.o lm.o
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obj-$(CONFIG_ARCH_INTEGRATOR_AP) += integrator_ap.o
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obj-$(CONFIG_ARCH_INTEGRATOR_CP) += integrator_cp.o
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@ -1,223 +0,0 @@
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/*
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* linux/arch/arm/mach-integrator/time.c
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*
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* Copyright (C) 2000-2001 Deep Blue Solutions Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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/time.h>
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#include <linux/mc146818rtc.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/amba/bus.h>
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#include <asm/hardware.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <asm/rtc.h>
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#include <asm/mach/time.h>
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#define RTC_DR (0)
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#define RTC_MR (4)
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#define RTC_STAT (8)
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#define RTC_EOI (8)
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#define RTC_LR (12)
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#define RTC_CR (16)
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#define RTC_CR_MIE (1 << 0)
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extern int (*set_rtc)(void);
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static void __iomem *rtc_base;
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static int integrator_set_rtc(void)
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{
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__raw_writel(xtime.tv_sec, rtc_base + RTC_LR);
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return 1;
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}
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static int integrator_rtc_read_alarm(struct rtc_wkalrm *alrm)
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{
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rtc_time_to_tm(readl(rtc_base + RTC_MR), &alrm->time);
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return 0;
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}
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static inline int integrator_rtc_set_alarm(struct rtc_wkalrm *alrm)
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{
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unsigned long time;
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int ret;
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/*
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* At the moment, we can only deal with non-wildcarded alarm times.
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*/
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ret = rtc_valid_tm(&alrm->time);
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if (ret == 0)
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ret = rtc_tm_to_time(&alrm->time, &time);
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if (ret == 0)
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writel(time, rtc_base + RTC_MR);
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return ret;
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}
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static int integrator_rtc_read_time(struct rtc_time *tm)
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{
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rtc_time_to_tm(readl(rtc_base + RTC_DR), tm);
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return 0;
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}
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/*
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* Set the RTC time. Unfortunately, we can't accurately set
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* the point at which the counter updates.
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*
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* Also, since RTC_LR is transferred to RTC_CR on next rising
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* edge of the 1Hz clock, we must write the time one second
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* in advance.
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*/
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static inline int integrator_rtc_set_time(struct rtc_time *tm)
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{
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unsigned long time;
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int ret;
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ret = rtc_tm_to_time(tm, &time);
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if (ret == 0)
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writel(time + 1, rtc_base + RTC_LR);
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return ret;
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}
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static struct rtc_ops rtc_ops = {
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.owner = THIS_MODULE,
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.read_time = integrator_rtc_read_time,
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.set_time = integrator_rtc_set_time,
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.read_alarm = integrator_rtc_read_alarm,
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.set_alarm = integrator_rtc_set_alarm,
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};
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static irqreturn_t arm_rtc_interrupt(int irq, void *dev_id)
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{
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writel(0, rtc_base + RTC_EOI);
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return IRQ_HANDLED;
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}
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static int rtc_probe(struct amba_device *dev, void *id)
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{
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int ret;
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if (rtc_base)
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return -EBUSY;
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ret = amba_request_regions(dev, NULL);
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if (ret)
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goto out;
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rtc_base = ioremap(dev->res.start, SZ_4K);
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if (!rtc_base) {
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ret = -ENOMEM;
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goto res_out;
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}
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__raw_writel(0, rtc_base + RTC_CR);
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__raw_writel(0, rtc_base + RTC_EOI);
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xtime.tv_sec = __raw_readl(rtc_base + RTC_DR);
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/* note that 'dev' is merely used for irq disambiguation;
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* it is not actually referenced in the irq handler
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*/
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ret = request_irq(dev->irq[0], arm_rtc_interrupt, IRQF_DISABLED,
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"rtc-pl030", dev);
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if (ret)
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goto map_out;
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ret = register_rtc(&rtc_ops);
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if (ret)
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goto irq_out;
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set_rtc = integrator_set_rtc;
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return 0;
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irq_out:
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free_irq(dev->irq[0], dev);
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map_out:
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iounmap(rtc_base);
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rtc_base = NULL;
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res_out:
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amba_release_regions(dev);
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out:
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return ret;
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}
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static int rtc_remove(struct amba_device *dev)
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{
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set_rtc = NULL;
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writel(0, rtc_base + RTC_CR);
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free_irq(dev->irq[0], dev);
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unregister_rtc(&rtc_ops);
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iounmap(rtc_base);
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rtc_base = NULL;
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amba_release_regions(dev);
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return 0;
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}
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static struct timespec rtc_delta;
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static int rtc_suspend(struct amba_device *dev, pm_message_t state)
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{
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struct timespec rtc;
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rtc.tv_sec = readl(rtc_base + RTC_DR);
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rtc.tv_nsec = 0;
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save_time_delta(&rtc_delta, &rtc);
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return 0;
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}
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static int rtc_resume(struct amba_device *dev)
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{
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struct timespec rtc;
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rtc.tv_sec = readl(rtc_base + RTC_DR);
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rtc.tv_nsec = 0;
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restore_time_delta(&rtc_delta, &rtc);
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return 0;
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}
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static struct amba_id rtc_ids[] = {
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{
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.id = 0x00041030,
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.mask = 0x000fffff,
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},
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{ 0, 0 },
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};
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static struct amba_driver rtc_driver = {
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.drv = {
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.name = "rtc-pl030",
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},
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.probe = rtc_probe,
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.remove = rtc_remove,
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.suspend = rtc_suspend,
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.resume = rtc_resume,
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.id_table = rtc_ids,
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};
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static int __init integrator_rtc_init(void)
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{
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return amba_driver_register(&rtc_driver);
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}
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static void __exit integrator_rtc_exit(void)
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{
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amba_driver_unregister(&rtc_driver);
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}
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module_init(integrator_rtc_init);
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module_exit(integrator_rtc_exit);
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@ -458,6 +458,16 @@ config RTC_DRV_VR41XX
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To compile this driver as a module, choose M here: the
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module will be called rtc-vr41xx.
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config RTC_DRV_PL030
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tristate "ARM AMBA PL030 RTC"
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depends on ARM_AMBA
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help
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If you say Y here you will get access to ARM AMBA
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PrimeCell PL030 RTC found on certain ARM SOCs.
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To compile this driver as a module, choose M here: the
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module will be called rtc-pl030.
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config RTC_DRV_PL031
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tristate "ARM AMBA PL031 RTC"
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depends on ARM_AMBA
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@ -40,6 +40,7 @@ obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o
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obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o
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obj-$(CONFIG_RTC_DRV_PCF8563) += rtc-pcf8563.o
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obj-$(CONFIG_RTC_DRV_PCF8583) += rtc-pcf8583.o
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obj-$(CONFIG_RTC_DRV_PL030) += rtc-pl030.o
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obj-$(CONFIG_RTC_DRV_PL031) += rtc-pl031.o
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obj-$(CONFIG_RTC_DRV_R9701) += rtc-r9701.o
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obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5c313.o
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@ -0,0 +1,217 @@
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/*
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* linux/drivers/rtc/rtc-pl030.c
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*
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* Copyright (C) 2000-2001 Deep Blue Solutions Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/rtc.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/amba/bus.h>
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#include <linux/io.h>
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#define RTC_DR (0)
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#define RTC_MR (4)
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#define RTC_STAT (8)
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#define RTC_EOI (8)
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#define RTC_LR (12)
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#define RTC_CR (16)
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#define RTC_CR_MIE (1 << 0)
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struct pl030_rtc {
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struct rtc_device *rtc;
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void __iomem *base;
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};
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static irqreturn_t pl030_interrupt(int irq, void *dev_id)
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{
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struct pl030_rtc *rtc = dev_id;
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writel(0, rtc->base + RTC_EOI);
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return IRQ_HANDLED;
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}
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static int pl030_open(struct device *dev)
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{
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return 0;
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}
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static void pl030_release(struct device *dev)
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{
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}
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static int pl030_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
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{
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return -ENOIOCTLCMD;
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}
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static int pl030_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct pl030_rtc *rtc = dev_get_drvdata(dev);
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rtc_time_to_tm(readl(rtc->base + RTC_MR), &alrm->time);
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return 0;
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}
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static int pl030_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct pl030_rtc *rtc = dev_get_drvdata(dev);
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unsigned long time;
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int ret;
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/*
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* At the moment, we can only deal with non-wildcarded alarm times.
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*/
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ret = rtc_valid_tm(&alrm->time);
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if (ret == 0)
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ret = rtc_tm_to_time(&alrm->time, &time);
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if (ret == 0)
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writel(time, rtc->base + RTC_MR);
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return ret;
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}
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static int pl030_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct pl030_rtc *rtc = dev_get_drvdata(dev);
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rtc_time_to_tm(readl(rtc->base + RTC_DR), tm);
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return 0;
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}
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/*
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* Set the RTC time. Unfortunately, we can't accurately set
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* the point at which the counter updates.
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*
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* Also, since RTC_LR is transferred to RTC_CR on next rising
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* edge of the 1Hz clock, we must write the time one second
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* in advance.
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*/
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static int pl030_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct pl030_rtc *rtc = dev_get_drvdata(dev);
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unsigned long time;
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int ret;
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ret = rtc_tm_to_time(tm, &time);
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if (ret == 0)
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writel(time + 1, rtc->base + RTC_LR);
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return ret;
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}
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static const struct rtc_class_ops pl030_ops = {
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.open = pl030_open,
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.release = pl030_release,
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.ioctl = pl030_ioctl,
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.read_time = pl030_read_time,
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.set_time = pl030_set_time,
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.read_alarm = pl030_read_alarm,
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.set_alarm = pl030_set_alarm,
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};
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static int pl030_probe(struct amba_device *dev, void *id)
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{
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struct pl030_rtc *rtc;
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int ret;
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ret = amba_request_regions(dev, NULL);
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if (ret)
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goto err_req;
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rtc = kmalloc(sizeof(*rtc), GFP_KERNEL);
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if (!rtc) {
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ret = -ENOMEM;
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goto err_rtc;
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}
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rtc->base = ioremap(dev->res.start, SZ_4K);
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if (!rtc->base) {
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ret = -ENOMEM;
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goto err_map;
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}
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__raw_writel(0, rtc->base + RTC_CR);
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__raw_writel(0, rtc->base + RTC_EOI);
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amba_set_drvdata(dev, rtc);
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ret = request_irq(dev->irq[0], pl030_interrupt, IRQF_DISABLED,
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"rtc-pl030", rtc);
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if (ret)
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goto err_irq;
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rtc->rtc = rtc_device_register("pl030", &dev->dev, &pl030_ops,
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THIS_MODULE);
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if (IS_ERR(rtc->rtc)) {
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ret = PTR_ERR(rtc->rtc);
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goto err_reg;
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}
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return 0;
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err_reg:
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free_irq(dev->irq[0], rtc);
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err_irq:
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iounmap(rtc->base);
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err_map:
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kfree(rtc);
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err_rtc:
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amba_release_regions(dev);
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err_req:
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return ret;
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}
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static int pl030_remove(struct amba_device *dev)
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{
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struct pl030_rtc *rtc = amba_get_drvdata(dev);
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amba_set_drvdata(dev, NULL);
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writel(0, rtc->base + RTC_CR);
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free_irq(dev->irq[0], rtc);
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rtc_device_unregister(rtc->rtc);
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iounmap(rtc->base);
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kfree(rtc);
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amba_release_regions(dev);
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return 0;
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}
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static struct amba_id pl030_ids[] = {
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{
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.id = 0x00041030,
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.mask = 0x000fffff,
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},
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{ 0, 0 },
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};
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static struct amba_driver pl030_driver = {
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.drv = {
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.name = "rtc-pl030",
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},
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.probe = pl030_probe,
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.remove = pl030_remove,
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.id_table = pl030_ids,
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};
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static int __init pl030_init(void)
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{
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return amba_driver_register(&pl030_driver);
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}
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static void __exit pl030_exit(void)
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{
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amba_driver_unregister(&pl030_driver);
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}
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module_init(pl030_init);
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module_exit(pl030_exit);
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MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
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MODULE_DESCRIPTION("ARM AMBA PL030 RTC Driver");
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MODULE_LICENSE("GPL");
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