这个patch是这次我们帮你们合入openAnolis中去,我们在合入的过程中发了了这些问题,我们是希望你们后期能够
修复或者回复一些疑惑的问题,目前its、rtc我们已经合入到内核里面去了,你发的这些疑问的地方是需要你们那边
解决的,如果你发现你review的需要修改,可以直接在最新的openAnolis代码中修改后,把patch发出,我们这边直接合入。
在 2021/3/26 上午12:45, 郭克 写道:
------------------------------------------------------------------
发件人:行信 <xingxin.hx(a)openanolis.org>
发送时间:2021年3月22日(星期一) 15:37
收件人:cloud-kernel <cloud-kernel(a)lists.openanolis.org>
主 题:[ck] Re: [PATCH openAnolis v1 2/4] PHYTIUM: rtc: new driver:
rtc-phytium add phytium rtc device support
在 2021/3/22 上午10:28, Baolin Wang 写道:
The subject line should be:
PHYTIUM: rtc: Add Phytium rtc device support
done
在 2021/3/20 18:30, Xin Hao 写道:
Add phytium ft25000 platform rtc driver.
Signed-off-by: Xin Hao <xingxin.hx(a)openanolis.org>
---
drivers/i2c/busses/i2c-designware-platdrv.c | 1 +
drivers/rtc/Kconfig | 10 +
drivers/rtc/Makefile | 1 +
drivers/rtc/rtc-phytium.c | 316 ++++++++++++++++++++
4 files changed, 328 insertions(+)
create mode 100644 drivers/rtc/rtc-phytium.c
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c
b/drivers/i2c/busses/i2c-designware-platdrv.c
index b5750fd85125..3818b7a0a847 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -151,6 +151,7 @@ static const struct acpi_device_id
dw_i2c_acpi_match[] = {
{ "APMC0D0F", 0 },
{ "HISI02A1", 0 },
{ "HISI02A2", 0 },
+ { "PHYT0003", 0 },
{ }
};
MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 7d7be60a2413..3e4effbf31ef 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1793,6 +1793,16 @@ config RTC_DRV_RTD119X
If you say yes here, you get support for the RTD1295 SoC
Real Time Clock.
+config RTC_DRV_PHYTIUM
+ tristate "Phytium RTC"
+ depends on ARCH_PHYTIUM
+ default y if ARCH_PHYTIUM
+ help
+ Say yes here to support the Phytium SoC real time clock.
+
+ This driver can also be built as a module, if so, the module
+ will be called "rtc-phytium".
+
comment "HID Sensor RTC drivers"
config RTC_DRV_HID_SENSOR_TIME
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 5ff2fc0c361a..289447233c6b 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -120,6 +120,7 @@ obj-$(CONFIG_RTC_DRV_PCF85363) += rtc-pcf85363.o
obj-$(CONFIG_RTC_DRV_PCF8523) += rtc-pcf8523.o
obj-$(CONFIG_RTC_DRV_PCF8563) += rtc-pcf8563.o
obj-$(CONFIG_RTC_DRV_PCF8583) += rtc-pcf8583.o
+obj-$(CONFIG_RTC_DRV_PHYTIUM) += rtc-phytium.o
obj-$(CONFIG_RTC_DRV_PIC32) += rtc-pic32.o
obj-$(CONFIG_RTC_DRV_PL030) += rtc-pl030.o
obj-$(CONFIG_RTC_DRV_PL031) += rtc-pl031.o
diff --git a/drivers/rtc/rtc-phytium.c b/drivers/rtc/rtc-phytium.c
new file mode 100644
index 000000000000..a9b5f52a9e8f
--- /dev/null
+++ b/drivers/rtc/rtc-phytium.c
@@ -0,0 +1,316 @@
+/*
+ * Phytium Real Time Clock Driver
+ *
+ * Copyright (c) 2019, Phytium Technology Co., Ltd.
+ *
+ * Chen Baozi <chenbaozi(a)phytium.com.cn>
+ *
+ * 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.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
Which API used this header file? Please remove it if unused.
done
+#include <linux/acpi.h>
+/* registers and masks need comments or No one knows what these are*/
+#define RTC_CMR 0x04
+#define RTC_AES_SEL 0x08
+#define RTC_AES_SEL_COUNTER 0x100
+#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
+#define RTC_CDR_LOW 0x20
+#define RTC_CCVR 0x24
+#define RTC_CLR_LOW 0x28
+#define RTC_CLR 0x2c
+#define RTC_COUNTER_HB_OFFSET 15
+#define RTC_COUNTER_LB_MASK GENMASK(14, 0)
+
+struct phytium_rtc_dev {
+ struct rtc_device *rtc;
+ struct device *dev;
+ unsigned long alarm_time;
+ void __iomem *csr_base;
+ struct clk *clk;
+ unsigned int irq_wake;
+ unsigned int irq_enabled;
+};
+
+static int phytium_rtc_read_time(struct device *dev, struct rtc_time
*tm)
+{
+ struct phytium_rtc_dev *pdata = dev_get_drvdata(dev);
+
Remove redundant blank line.
done
+ unsigned long counter = 0;
+ unsigned long tmp = 0;
No need to initialize them.
+
+ writel(RTC_AES_SEL_COUNTER, pdata->csr_base + RTC_AES_SEL);
+ counter = readl(pdata->csr_base + RTC_CCVR);
+ tmp = readl(pdata->csr_base + RTC_CDR_LOW); //why? I am confusing
Can you add some comments to explain why we need read RTC_CDR_LOW
register, but did not use the return value?
the PHYTIUM engineer can explain it ? thanks
+
+ rtc_time_to_tm(counter, tm);
+ return rtc_valid_tm(tm);
+}
+
+static int phytium_rtc_set_mmss(struct device *dev, unsigned long secs)
+{
+ struct phytium_rtc_dev *pdata = dev_get_drvdata(dev);
+ unsigned long counter = 0;
+ unsigned long tmp = 0;
Ditto
> +
> + writel(RTC_AES_SEL_COUNTER, pdata->csr_base + RTC_AES_SEL);
> + writel(0x00000000, pdata->csr_base + RTC_CLR_LOW);
> + writel((u32)secs, pdata->csr_base + RTC_CLR);
> + writel(RTC_AES_SEL_COUNTER, pdata->csr_base + RTC_AES_SEL);
> + counter = readl(pdata->csr_base + RTC_CLR); // what does these mean?
> + tmp = readl(pdata->csr_base + RTC_CLR_LOW);
> +
> + return 0;
> +}
> +
> +static int phytium_rtc_read_alarm(struct device *dev, struct
> rtc_wkalrm *alrm)
> +{
> + struct phytium_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 phytium_rtc_alarm_irq_enable(struct device *dev, u32
> enabled)
> +{
> + struct phytium_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;
> +}
> + // it is very stange here. I think you made a mistake.
> +static int phytium_rtc_alarm_irq_enabled(struct device *dev)
> +{
> + struct phytium_rtc_dev *pdata = dev_get_drvdata(dev);
> +
> + return readl(pdata->csr_base + RTC_CCR) & RTC_CCR_IE ? 1 : 0;
> +}
> +
> +static int phytium_rtc_set_alarm(struct device *dev, struct
> rtc_wkalrm *alrm)
> +{
> + struct phytium_rtc_dev *pdata = dev_get_drvdata(dev);
> + unsigned long alarm_time; //the variable is never read in the
other functions, why not to put it in private data instead of as a
local variable
+
+ rtc_tm_to_time(&alrm->time, &alarm_time);
+
+ pdata->alarm_time = alarm_time;
+ writel((u32) pdata->alarm_time, pdata->csr_base + RTC_CMR);
+
+ phytium_rtc_alarm_irq_enable(dev, alrm->enabled);
+
+ return 0;
+}
+
+static const struct rtc_class_ops phytium_rtc_ops = {
+ .read_time = phytium_rtc_read_time,
+ .set_mmss = phytium_rtc_set_mmss,
I still think we should change to implement the 'set_time' ops, since
the set_mmss is deprecated in CK 5.10 and mainline kernel.
no change
> + .read_alarm = phytium_rtc_read_alarm,
> + .set_alarm = phytium_rtc_set_alarm,
> + .alarm_irq_enable = phytium_rtc_alarm_irq_enable,
> +};
> + /* the error handling is really ugly, you should handle these
error at the end of the function and you miss some resources 。I advise
u to learn to use goto to handle errors*/
> +static irqreturn_t phytium_rtc_interrupt(int irq, void *id)
> +{
> + struct phytium_rtc_dev *pdata = (struct phytium_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 phytium_rtc_probe(struct platform_device *pdev)
> +{
> + struct phytium_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, phytium_rtc_interrupt, 0,
> + dev_name(&pdev->dev), pdata);
> + if (ret) {
> + dev_err(&pdev->dev, "Could not request IRQ\n");
> + return ret;
> + }
> +
> +#ifndef CONFIG_ACPI
> + 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;
> +#endif
> +
> + /* 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 = devm_rtc_device_register(&pdev->dev, pdev->name,
> + &phytium_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 secondsthis variable is never used
*/
> + pdata->rtc->uie_unsupported = 1;
> +
> + return 0;
> +}
> +
> +static int phytium_rtc_remove(struct platform_device *pdev)
> +{
> + struct phytium_rtc_dev *pdata = platform_get_drvdata(pdev);
> + //why enable this irq hers?
> + phytium_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 phytium_rtc_suspend(struct device *dev)
> +{ //the same as the phytium_rtc_resume, all the drive private
information should be got at probe time and stored for later use
> + struct platform_device *pdev = to_platform_device(dev);
> + struct phytium_rtc_dev *pdata = platform_get_drvdata(pdev);
> + int irq;
> +
> + /*
> + * 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.
> + */
> + irq = platform_get_irq(pdev, 0);
> + if (device_may_wakeup(&pdev->dev)) {
> + if (!enable_irq_wake(irq))
> + pdata->irq_wake = 1;
> + } else {
> + pdata->irq_enabled = phytium_rtc_alarm_irq_enabled(dev);
> + phytium_rtc_alarm_irq_enable(dev, 0);
> + clk_disable_unprepare(pdata->clk);
> + }
> +
> + return 0;
> +}
> +
> +static int phytium_rtc_resume(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct phytium_rtc_dev *pdata = platform_get_drvdata(pdev);
> + int irq;
> + int rc;
> + //This irq should be got this irq in probe procedure and be
stored in your driver private data.
> + 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 {
//This clock is the same as above.
+ rc = clk_prepare_enable(pdata->clk);
+ if (rc) {
+ dev_err(dev, "Unable to enable clock error %d\n", rc);
+ return rc;
+ }
+ phytium_rtc_alarm_irq_enable(dev, pdata->irq_enabled);
+ }
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(phytium_rtc_pm_ops, phytium_rtc_suspend,
phytium_rtc_resume);
+
+#ifdef CONFIG_OF
+static const struct of_device_id phytium_rtc_of_match[] = {
+ { .compatible = "phytium,rtc" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, phytium_rtc_of_match);
+#endif
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id phytium_rtc_acpi_match[] = {
+ { "PHYT0002", 0 },
+ { }
+};
+#endif
+
+static struct platform_driver phytium_rtc_driver = {
+ .probe = phytium_rtc_probe,
+ .remove = phytium_rtc_remove,
+ .driver = {
+ .name = "phytium-rtc",
+ .pm = &phytium_rtc_pm_ops,
+ .of_match_table = of_match_ptr(phytium_rtc_of_match),
+ .acpi_match_table = ACPI_PTR(phytium_rtc_acpi_match),
+ },
+};
+
+module_platform_driver(phytium_rtc_driver);
+
+MODULE_DESCRIPTION("Phytium RTC driver");
+MODULE_AUTHOR("Chen Baozi <chenbaozi(a)phytium.com.cn>")>");
+MODULE_LICENSE("GPL");
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