diff options
Diffstat (limited to 'drivers/rtc/rtc-sirfsoc.c')
| -rw-r--r-- | drivers/rtc/rtc-sirfsoc.c | 446 |
1 files changed, 0 insertions, 446 deletions
diff --git a/drivers/rtc/rtc-sirfsoc.c b/drivers/rtc/rtc-sirfsoc.c deleted file mode 100644 index 03a6cca23201..000000000000 --- a/drivers/rtc/rtc-sirfsoc.c +++ /dev/null @@ -1,446 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * SiRFSoC Real Time Clock interface for Linux - * - * Copyright (c) 2013 Cambridge Silicon Radio Limited, a CSR plc group company. - */ - -#include <linux/module.h> -#include <linux/err.h> -#include <linux/rtc.h> -#include <linux/platform_device.h> -#include <linux/slab.h> -#include <linux/io.h> -#include <linux/of.h> -#include <linux/regmap.h> -#include <linux/rtc/sirfsoc_rtciobrg.h> - - -#define RTC_CN 0x00 -#define RTC_ALARM0 0x04 -#define RTC_ALARM1 0x18 -#define RTC_STATUS 0x08 -#define RTC_SW_VALUE 0x40 -#define SIRFSOC_RTC_AL1E (1<<6) -#define SIRFSOC_RTC_AL1 (1<<4) -#define SIRFSOC_RTC_HZE (1<<3) -#define SIRFSOC_RTC_AL0E (1<<2) -#define SIRFSOC_RTC_HZ (1<<1) -#define SIRFSOC_RTC_AL0 (1<<0) -#define RTC_DIV 0x0c -#define RTC_DEEP_CTRL 0x14 -#define RTC_CLOCK_SWITCH 0x1c -#define SIRFSOC_RTC_CLK 0x03 /* others are reserved */ - -/* Refer to RTC DIV switch */ -#define RTC_HZ 16 - -/* This macro is also defined in arch/arm/plat-sirfsoc/cpu.c */ -#define RTC_SHIFT 4 - -#define INTR_SYSRTC_CN 0x48 - -struct sirfsoc_rtc_drv { - struct rtc_device *rtc; - u32 rtc_base; - u32 irq; - unsigned irq_wake; - /* Overflow for every 8 years extra time */ - u32 overflow_rtc; - spinlock_t lock; - struct regmap *regmap; -#ifdef CONFIG_PM - u32 saved_counter; - u32 saved_overflow_rtc; -#endif -}; - -static u32 sirfsoc_rtc_readl(struct sirfsoc_rtc_drv *rtcdrv, u32 offset) -{ - u32 val; - - regmap_read(rtcdrv->regmap, rtcdrv->rtc_base + offset, &val); - return val; -} - -static void sirfsoc_rtc_writel(struct sirfsoc_rtc_drv *rtcdrv, - u32 offset, u32 val) -{ - regmap_write(rtcdrv->regmap, rtcdrv->rtc_base + offset, val); -} - -static int sirfsoc_rtc_read_alarm(struct device *dev, - struct rtc_wkalrm *alrm) -{ - unsigned long rtc_alarm, rtc_count; - struct sirfsoc_rtc_drv *rtcdrv; - - rtcdrv = dev_get_drvdata(dev); - - spin_lock_irq(&rtcdrv->lock); - - rtc_count = sirfsoc_rtc_readl(rtcdrv, RTC_CN); - - rtc_alarm = sirfsoc_rtc_readl(rtcdrv, RTC_ALARM0); - memset(alrm, 0, sizeof(struct rtc_wkalrm)); - - /* - * assume alarm interval not beyond one round counter overflow_rtc: - * 0->0xffffffff - */ - /* if alarm is in next overflow cycle */ - if (rtc_count > rtc_alarm) - rtc_time64_to_tm((rtcdrv->overflow_rtc + 1) - << (BITS_PER_LONG - RTC_SHIFT) - | rtc_alarm >> RTC_SHIFT, &alrm->time); - else - rtc_time64_to_tm(rtcdrv->overflow_rtc - << (BITS_PER_LONG - RTC_SHIFT) - | rtc_alarm >> RTC_SHIFT, &alrm->time); - if (sirfsoc_rtc_readl(rtcdrv, RTC_STATUS) & SIRFSOC_RTC_AL0E) - alrm->enabled = 1; - - spin_unlock_irq(&rtcdrv->lock); - - return 0; -} - -static int sirfsoc_rtc_set_alarm(struct device *dev, - struct rtc_wkalrm *alrm) -{ - unsigned long rtc_status_reg, rtc_alarm; - struct sirfsoc_rtc_drv *rtcdrv; - rtcdrv = dev_get_drvdata(dev); - - if (alrm->enabled) { - rtc_alarm = rtc_tm_to_time64(&alrm->time); - - spin_lock_irq(&rtcdrv->lock); - - rtc_status_reg = sirfsoc_rtc_readl(rtcdrv, RTC_STATUS); - if (rtc_status_reg & SIRFSOC_RTC_AL0E) { - /* - * An ongoing alarm in progress - ingore it and not - * to return EBUSY - */ - dev_info(dev, "An old alarm was set, will be replaced by a new one\n"); - } - - sirfsoc_rtc_writel(rtcdrv, RTC_ALARM0, rtc_alarm << RTC_SHIFT); - rtc_status_reg &= ~0x07; /* mask out the lower status bits */ - /* - * This bit RTC_AL sets it as a wake-up source for Sleep Mode - * Writing 1 into this bit will clear it - */ - rtc_status_reg |= SIRFSOC_RTC_AL0; - /* enable the RTC alarm interrupt */ - rtc_status_reg |= SIRFSOC_RTC_AL0E; - sirfsoc_rtc_writel(rtcdrv, RTC_STATUS, rtc_status_reg); - - spin_unlock_irq(&rtcdrv->lock); - } else { - /* - * if this function was called with enabled=0 - * then it could mean that the application is - * trying to cancel an ongoing alarm - */ - spin_lock_irq(&rtcdrv->lock); - - rtc_status_reg = sirfsoc_rtc_readl(rtcdrv, RTC_STATUS); - if (rtc_status_reg & SIRFSOC_RTC_AL0E) { - /* clear the RTC status register's alarm bit */ - rtc_status_reg &= ~0x07; - /* write 1 into SIRFSOC_RTC_AL0 to force a clear */ - rtc_status_reg |= (SIRFSOC_RTC_AL0); - /* Clear the Alarm enable bit */ - rtc_status_reg &= ~(SIRFSOC_RTC_AL0E); - - sirfsoc_rtc_writel(rtcdrv, RTC_STATUS, - rtc_status_reg); - } - - spin_unlock_irq(&rtcdrv->lock); - } - - return 0; -} - -static int sirfsoc_rtc_read_time(struct device *dev, - struct rtc_time *tm) -{ - unsigned long tmp_rtc = 0; - struct sirfsoc_rtc_drv *rtcdrv; - rtcdrv = dev_get_drvdata(dev); - /* - * This patch is taken from WinCE - Need to validate this for - * correctness. To work around sirfsoc RTC counter double sync logic - * fail, read several times to make sure get stable value. - */ - do { - tmp_rtc = sirfsoc_rtc_readl(rtcdrv, RTC_CN); - cpu_relax(); - } while (tmp_rtc != sirfsoc_rtc_readl(rtcdrv, RTC_CN)); - - rtc_time64_to_tm(rtcdrv->overflow_rtc << (BITS_PER_LONG - RTC_SHIFT) - | tmp_rtc >> RTC_SHIFT, tm); - return 0; -} - -static int sirfsoc_rtc_set_time(struct device *dev, - struct rtc_time *tm) -{ - unsigned long rtc_time; - struct sirfsoc_rtc_drv *rtcdrv; - rtcdrv = dev_get_drvdata(dev); - - rtc_time = rtc_tm_to_time64(tm); - - rtcdrv->overflow_rtc = rtc_time >> (BITS_PER_LONG - RTC_SHIFT); - - sirfsoc_rtc_writel(rtcdrv, RTC_SW_VALUE, rtcdrv->overflow_rtc); - sirfsoc_rtc_writel(rtcdrv, RTC_CN, rtc_time << RTC_SHIFT); - - return 0; -} - -static int sirfsoc_rtc_alarm_irq_enable(struct device *dev, - unsigned int enabled) -{ - unsigned long rtc_status_reg = 0x0; - struct sirfsoc_rtc_drv *rtcdrv; - - rtcdrv = dev_get_drvdata(dev); - - spin_lock_irq(&rtcdrv->lock); - - rtc_status_reg = sirfsoc_rtc_readl(rtcdrv, RTC_STATUS); - if (enabled) - rtc_status_reg |= SIRFSOC_RTC_AL0E; - else - rtc_status_reg &= ~SIRFSOC_RTC_AL0E; - - sirfsoc_rtc_writel(rtcdrv, RTC_STATUS, rtc_status_reg); - - spin_unlock_irq(&rtcdrv->lock); - - return 0; - -} - -static const struct rtc_class_ops sirfsoc_rtc_ops = { - .read_time = sirfsoc_rtc_read_time, - .set_time = sirfsoc_rtc_set_time, - .read_alarm = sirfsoc_rtc_read_alarm, - .set_alarm = sirfsoc_rtc_set_alarm, - .alarm_irq_enable = sirfsoc_rtc_alarm_irq_enable -}; - -static irqreturn_t sirfsoc_rtc_irq_handler(int irq, void *pdata) -{ - struct sirfsoc_rtc_drv *rtcdrv = pdata; - unsigned long rtc_status_reg = 0x0; - unsigned long events = 0x0; - - spin_lock(&rtcdrv->lock); - - rtc_status_reg = sirfsoc_rtc_readl(rtcdrv, RTC_STATUS); - /* this bit will be set ONLY if an alarm was active - * and it expired NOW - * So this is being used as an ASSERT - */ - if (rtc_status_reg & SIRFSOC_RTC_AL0) { - /* - * clear the RTC status register's alarm bit - * mask out the lower status bits - */ - rtc_status_reg &= ~0x07; - /* write 1 into SIRFSOC_RTC_AL0 to ACK the alarm interrupt */ - rtc_status_reg |= (SIRFSOC_RTC_AL0); - /* Clear the Alarm enable bit */ - rtc_status_reg &= ~(SIRFSOC_RTC_AL0E); - } - - sirfsoc_rtc_writel(rtcdrv, RTC_STATUS, rtc_status_reg); - - spin_unlock(&rtcdrv->lock); - - /* this should wake up any apps polling/waiting on the read - * after setting the alarm - */ - events |= RTC_IRQF | RTC_AF; - rtc_update_irq(rtcdrv->rtc, 1, events); - - return IRQ_HANDLED; -} - -static const struct of_device_id sirfsoc_rtc_of_match[] = { - { .compatible = "sirf,prima2-sysrtc"}, - {}, -}; - -static const struct regmap_config sysrtc_regmap_config = { - .reg_bits = 32, - .val_bits = 32, - .fast_io = true, -}; - -MODULE_DEVICE_TABLE(of, sirfsoc_rtc_of_match); - -static int sirfsoc_rtc_probe(struct platform_device *pdev) -{ - int err; - unsigned long rtc_div; - struct sirfsoc_rtc_drv *rtcdrv; - struct device_node *np = pdev->dev.of_node; - - rtcdrv = devm_kzalloc(&pdev->dev, - sizeof(struct sirfsoc_rtc_drv), GFP_KERNEL); - if (rtcdrv == NULL) - return -ENOMEM; - - spin_lock_init(&rtcdrv->lock); - - err = of_property_read_u32(np, "reg", &rtcdrv->rtc_base); - if (err) { - dev_err(&pdev->dev, "unable to find base address of rtc node in dtb\n"); - return err; - } - - platform_set_drvdata(pdev, rtcdrv); - - /* Register rtc alarm as a wakeup source */ - device_init_wakeup(&pdev->dev, 1); - - rtcdrv->regmap = devm_regmap_init_iobg(&pdev->dev, - &sysrtc_regmap_config); - if (IS_ERR(rtcdrv->regmap)) { - err = PTR_ERR(rtcdrv->regmap); - dev_err(&pdev->dev, "Failed to allocate register map: %d\n", - err); - return err; - } - - /* - * Set SYS_RTC counter in RTC_HZ HZ Units - * We are using 32K RTC crystal (32768 / RTC_HZ / 2) -1 - * If 16HZ, therefore RTC_DIV = 1023; - */ - rtc_div = ((32768 / RTC_HZ) / 2) - 1; - sirfsoc_rtc_writel(rtcdrv, RTC_DIV, rtc_div); - - /* 0x3 -> RTC_CLK */ - sirfsoc_rtc_writel(rtcdrv, RTC_CLOCK_SWITCH, SIRFSOC_RTC_CLK); - - /* reset SYS RTC ALARM0 */ - sirfsoc_rtc_writel(rtcdrv, RTC_ALARM0, 0x0); - - /* reset SYS RTC ALARM1 */ - sirfsoc_rtc_writel(rtcdrv, RTC_ALARM1, 0x0); - - /* Restore RTC Overflow From Register After Command Reboot */ - rtcdrv->overflow_rtc = - sirfsoc_rtc_readl(rtcdrv, RTC_SW_VALUE); - - rtcdrv->rtc = devm_rtc_allocate_device(&pdev->dev); - if (IS_ERR(rtcdrv->rtc)) - return PTR_ERR(rtcdrv->rtc); - - rtcdrv->rtc->ops = &sirfsoc_rtc_ops; - rtcdrv->rtc->range_max = (1ULL << 60) - 1; - - rtcdrv->irq = platform_get_irq(pdev, 0); - err = devm_request_irq(&pdev->dev, rtcdrv->irq, sirfsoc_rtc_irq_handler, - IRQF_SHARED, pdev->name, rtcdrv); - if (err) { - dev_err(&pdev->dev, "Unable to register for the SiRF SOC RTC IRQ\n"); - return err; - } - - return devm_rtc_register_device(rtcdrv->rtc); -} - -#ifdef CONFIG_PM_SLEEP -static int sirfsoc_rtc_suspend(struct device *dev) -{ - struct sirfsoc_rtc_drv *rtcdrv = dev_get_drvdata(dev); - rtcdrv->overflow_rtc = - sirfsoc_rtc_readl(rtcdrv, RTC_SW_VALUE); - - rtcdrv->saved_counter = - sirfsoc_rtc_readl(rtcdrv, RTC_CN); - rtcdrv->saved_overflow_rtc = rtcdrv->overflow_rtc; - if (device_may_wakeup(dev) && !enable_irq_wake(rtcdrv->irq)) - rtcdrv->irq_wake = 1; - - return 0; -} - -static int sirfsoc_rtc_resume(struct device *dev) -{ - u32 tmp; - struct sirfsoc_rtc_drv *rtcdrv = dev_get_drvdata(dev); - - /* - * if resume from snapshot and the rtc power is lost, - * restroe the rtc settings - */ - if (SIRFSOC_RTC_CLK != sirfsoc_rtc_readl(rtcdrv, RTC_CLOCK_SWITCH)) { - u32 rtc_div; - /* 0x3 -> RTC_CLK */ - sirfsoc_rtc_writel(rtcdrv, RTC_CLOCK_SWITCH, SIRFSOC_RTC_CLK); - /* - * Set SYS_RTC counter in RTC_HZ HZ Units - * We are using 32K RTC crystal (32768 / RTC_HZ / 2) -1 - * If 16HZ, therefore RTC_DIV = 1023; - */ - rtc_div = ((32768 / RTC_HZ) / 2) - 1; - - sirfsoc_rtc_writel(rtcdrv, RTC_DIV, rtc_div); - - /* reset SYS RTC ALARM0 */ - sirfsoc_rtc_writel(rtcdrv, RTC_ALARM0, 0x0); - - /* reset SYS RTC ALARM1 */ - sirfsoc_rtc_writel(rtcdrv, RTC_ALARM1, 0x0); - } - rtcdrv->overflow_rtc = rtcdrv->saved_overflow_rtc; - - /* - * if current counter is small than previous, - * it means overflow in sleep - */ - tmp = sirfsoc_rtc_readl(rtcdrv, RTC_CN); - if (tmp <= rtcdrv->saved_counter) - rtcdrv->overflow_rtc++; - /* - *PWRC Value Be Changed When Suspend, Restore Overflow - * In Memory To Register - */ - sirfsoc_rtc_writel(rtcdrv, RTC_SW_VALUE, rtcdrv->overflow_rtc); - - if (device_may_wakeup(dev) && rtcdrv->irq_wake) { - disable_irq_wake(rtcdrv->irq); - rtcdrv->irq_wake = 0; - } - - return 0; -} -#endif - -static SIMPLE_DEV_PM_OPS(sirfsoc_rtc_pm_ops, - sirfsoc_rtc_suspend, sirfsoc_rtc_resume); - -static struct platform_driver sirfsoc_rtc_driver = { - .driver = { - .name = "sirfsoc-rtc", - .pm = &sirfsoc_rtc_pm_ops, - .of_match_table = sirfsoc_rtc_of_match, - }, - .probe = sirfsoc_rtc_probe, -}; -module_platform_driver(sirfsoc_rtc_driver); - -MODULE_DESCRIPTION("SiRF SoC rtc driver"); -MODULE_AUTHOR("Xianglong Du <Xianglong.Du@csr.com>"); -MODULE_LICENSE("GPL v2"); -MODULE_ALIAS("platform:sirfsoc-rtc"); |