Re: [PATCH 1/3] rtc: remove sirfsoc driver

From: Barry Song
Date: Wed Jan 20 2021 - 16:51:34 EST

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Arnd Bergmann <arnd@xxxxxxxxxx> 于2021年1月21日周四上午4:42写道：
>
> From: Arnd Bergmann <arnd@xxxxxxxx>
>
> The CSR SiRF prima2/atlas platforms are getting removed, so this driver
> is no longer needed.
>
> Cc: Barry Song <baohua@xxxxxxxxxx>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>

Acked-by: Barry Song <baohua@xxxxxxxxxx>

> ---
> .../bindings/rtc/sirf,prima2-sysrtc.txt | 13 -
> drivers/rtc/Kconfig | 7 -
> drivers/rtc/Makefile | 1 -
> drivers/rtc/rtc-sirfsoc.c | 446 ------------------
> include/linux/rtc/sirfsoc_rtciobrg.h | 21 -
> 5 files changed, 488 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/rtc/sirf,prima2-sysrtc.txt
> delete mode 100644 drivers/rtc/rtc-sirfsoc.c
> delete mode 100644 include/linux/rtc/sirfsoc_rtciobrg.h
>
> diff --git a/Documentation/devicetree/bindings/rtc/sirf,prima2-sysrtc.txt b/Documentation/devicetree/bindings/rtc/sirf,prima2-sysrtc.txt
> deleted file mode 100644
> index 58885b55da21..000000000000
> --- a/Documentation/devicetree/bindings/rtc/sirf,prima2-sysrtc.txt
> +++ /dev/null
> @@ -1,13 +0,0 @@
> -SiRFSoC Real Time Clock
> -
> -Required properties:
> -- compatible: must be "sirf,prima2-sysrtc"
> -- reg: address range of rtc register set.
> -- interrupts: rtc alarm interrupts.
> -
> -Example:
> - rtc@2000 {
> - compatible = "sirf,prima2-sysrtc";
> - reg = <0x2000 0x1000>;
> - interrupts = <52 53 54>;
> - };
> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
> index 6123f9f4fbc9..8fb9aa55ace1 100644
> --- a/drivers/rtc/Kconfig
> +++ b/drivers/rtc/Kconfig
> @@ -1799,13 +1799,6 @@ config RTC_DRV_IMX_SC
> If you say yes here you get support for the NXP i.MX System
> Controller RTC module.
>
> -config RTC_DRV_SIRFSOC
> - tristate "SiRFSOC RTC"
> - depends on ARCH_SIRF
> - help
> - Say "yes" here to support the real time clock on SiRF SOC chips.
> - This driver can also be built as a module called rtc-sirfsoc.
> -
> config RTC_DRV_ST_LPC
> tristate "STMicroelectronics LPC RTC"
> depends on ARCH_STI
> diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
> index bb8f319b09fb..1f00896db507 100644
> --- a/drivers/rtc/Makefile
> +++ b/drivers/rtc/Makefile
> @@ -154,7 +154,6 @@ obj-$(CONFIG_RTC_DRV_SA1100) += rtc-sa1100.o
> obj-$(CONFIG_RTC_DRV_SC27XX) += rtc-sc27xx.o
> obj-$(CONFIG_RTC_DRV_SD3078) += rtc-sd3078.o
> obj-$(CONFIG_RTC_DRV_SH) += rtc-sh.o
> -obj-$(CONFIG_RTC_DRV_SIRFSOC) += rtc-sirfsoc.o
> obj-$(CONFIG_RTC_DRV_SNVS) += rtc-snvs.o
> obj-$(CONFIG_RTC_DRV_SPEAR) += rtc-spear.o
> obj-$(CONFIG_RTC_DRV_STARFIRE) += rtc-starfire.o
> 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@xxxxxxx>");
> -MODULE_LICENSE("GPL v2");
> -MODULE_ALIAS("platform:sirfsoc-rtc");
> diff --git a/include/linux/rtc/sirfsoc_rtciobrg.h b/include/linux/rtc/sirfsoc_rtciobrg.h
> deleted file mode 100644
> index b31f2856733d..000000000000
> --- a/include/linux/rtc/sirfsoc_rtciobrg.h
> +++ /dev/null
> @@ -1,21 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0-or-later */
> -/*
> - * RTC I/O Bridge interfaces for CSR SiRFprimaII
> - * ARM access the registers of SYSRTC, GPSRTC and PWRC through this module
> - *
> - * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
> - */
> -#ifndef _SIRFSOC_RTC_IOBRG_H_
> -#define _SIRFSOC_RTC_IOBRG_H_
> -
> -struct regmap_config;
> -
> -extern void sirfsoc_rtc_iobrg_besyncing(void);
> -
> -extern u32 sirfsoc_rtc_iobrg_readl(u32 addr);
> -
> -extern void sirfsoc_rtc_iobrg_writel(u32 val, u32 addr);
> -struct regmap *devm_regmap_init_iobg(struct device *dev,
> - const struct regmap_config *config);
> -
> -#endif
> --
> 2.29.2
>

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