RTC support for AMlogic devies

RTC support for AMlogic devies

[Ben Dooks]

This series is support for the RTC block on some of the AMLogic
Meson ARM SoCs.

The first patch is the driver, followed by device-tree patches
and enablement for the ODRoid-C1 (where it has been tested)

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[PATCH 1/4] rtc: support for amlogic meson rtc

[Ben Dooks]

Add support for the AMLogic meson8b/meson6 RTC block.

Signed-off-by: Ben Dooks <ben.dooks-4yDnlxn2s6sWdaTGBSpHTA@public.gmane.org>
---
 drivers/rtc/Kconfig     |  10 ++
 drivers/rtc/Makefile    |   1 +
 drivers/rtc/rtc-meson.c | 345 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 356 insertions(+)
 create mode 100644 drivers/rtc/rtc-meson.c

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 18639e0..b4554c5 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1210,6 +1210,16 @@ config RTC_DRV_IMXDI
 	   This driver can also be built as a module, if so, the module
 	   will be called "rtc-imxdi".
 
+config RTC_DRV_MESON
+	tristate "AMLogic Meson Real Time Clock"
+	depends on ARCH_MESON || COMPILE_TEST
+	help
+	   Support for AMLogic Meson RTC block
+
+	   This driver can also be built as a module, if so, the module
+	   will be called "rtc-meson".
+
+
 config RTC_DRV_OMAP
 	tristate "TI OMAP Real Time Clock"
 	depends on ARCH_OMAP || ARCH_DAVINCI || COMPILE_TEST
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index ea28337..0b4f106 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -92,6 +92,7 @@ obj-$(CONFIG_RTC_DRV_MAX8997)	+= rtc-max8997.o
 obj-$(CONFIG_RTC_DRV_MAX8998)	+= rtc-max8998.o
 obj-$(CONFIG_RTC_DRV_MC13XXX)	+= rtc-mc13xxx.o
 obj-$(CONFIG_RTC_DRV_MCP795)	+= rtc-mcp795.o
+obj-$(CONFIG_RTC_DRV_MESON)	+= rtc-meson.o
 obj-$(CONFIG_RTC_DRV_MOXART)	+= rtc-moxart.o
 obj-$(CONFIG_RTC_DRV_MPC5121)	+= rtc-mpc5121.o
 obj-$(CONFIG_RTC_DRV_VRTC)	+= rtc-mrst.o
diff --git a/drivers/rtc/rtc-meson.c b/drivers/rtc/rtc-meson.c
new file mode 100644
index 0000000..a070c7e
--- /dev/null
+++ b/drivers/rtc/rtc-meson.c
@@ -0,0 +1,345 @@
+/* drivers/rtc/rtc-meson.c
+ *
+ * Copyright (c) 2015 Codethink Ltd
+ *	 Ben Dooks <ben.dooks-4yDnlxn2s6sWdaTGBSpHTA@public.gmane.org>
+ * Based on origin by Carlo Caione <carlo-6IF/jdPJHihWk0Htik3J/w@public.gmane.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/reset.h>
+#include <linux/rtc.h>
+#include <linux/io.h>
+#include <linux/of.h>
+
+/* registers accessed from cpu bus */
+#define RTC_REG(x)		((x) * 4)	/* rtc registers 0-4 */
+
+#define LINE_SDI		(1 << 2)
+#define LINE_SEN		(1 << 1)
+#define LINE_SCLK		(1 << 0)
+
+#define RTCREG0_START_SER	BIT(17)
+#define RTCREG0_WAIT_SER	BIT(22)
+#define RTC_REG0_DATA(__data)	((__data) << 24)
+
+#define RTCREG1_READY		BIT(1)
+
+/* rtc registers accessed via rtc-serial inteface */
+#define RTC_COUNTER		(0)
+#define RTC_SEC_ADJ		(2)
+
+#define RTC_ADDR_BITS		(3)	/* number of address bits to send */
+#define RTC_DATA_BITS		(32)	/* number of data bits to tx/rx */
+
+#define MESON_STATIC_BIAS_CUR	(0x5 << 1)
+#define MESON_STATIC_VOLTAGE	(0x3 << 11)
+
+struct meson_rtc {
+	struct rtc_device	*rtc;	/* rtc device we created */
+	struct device		*dev;	/* device we bound from */
+	struct reset_control	*reset;	/* reset source */
+	struct mutex		lock;	/* rtc lock */
+	void __iomem		*regs;	/* rtc register access */
+};
+
+static void meson_rtc_setline(struct meson_rtc *rtc, unsigned bit, unsigned to)
+{
+	u32 reg0;
+
+	reg0 = readl(rtc->regs + RTC_REG(0));
+	if (to)
+		reg0 |= bit;
+	else
+		reg0 &= ~bit;
+	writel(reg0, rtc->regs + RTC_REG(0));
+	
+}
+
+static void meson_rtc_sclk_pulse(struct meson_rtc *rtc)
+{
+	udelay(5);
+	meson_rtc_setline(rtc, LINE_SCLK, 0);
+	udelay(5);
+	meson_rtc_setline(rtc, LINE_SCLK, 1);
+}
+
+static void meson_rtc_send_bit(struct meson_rtc *rtc, unsigned bit)
+{
+	meson_rtc_setline(rtc, LINE_SDI, bit ? 1 : 0);
+	meson_rtc_sclk_pulse(rtc);
+}
+
+static void meson_rtc_send_bits(struct meson_rtc *rtc, u32 data, unsigned nr)
+{
+	u32 bit = 1 << (nr - 1);
+
+	while (bit) {
+		meson_rtc_send_bit(rtc, data & bit);
+		bit >>= 1;
+	}
+}
+
+static void meson_rtc_set_dir(struct meson_rtc *rtc, u32 mode)
+{
+	meson_rtc_setline(rtc, LINE_SEN, 0);
+	meson_rtc_setline(rtc, LINE_SDI, 0);
+	meson_rtc_send_bit(rtc, mode);
+	meson_rtc_setline(rtc, LINE_SDI, 0);
+}
+
+static u32 meson_rtc_read_sdo(struct meson_rtc *rtc)
+{
+	return readl(rtc->regs + RTC_REG(1)) & BIT(0);
+}
+
+static u32 meson_rtc_get_data(struct meson_rtc *rtc)
+{
+	u32 val = 0;
+	int bit;
+
+	for (bit = 0; bit < RTC_DATA_BITS; bit++) {
+		meson_rtc_sclk_pulse(rtc);
+		val <<= 1;
+		val |= meson_rtc_read_sdo(rtc);
+	}
+
+	return val;
+}
+
+static void meson_rtc_prep_bus(struct meson_rtc *rtc)
+{
+	u32 val;
+
+	val = readl(rtc->regs + RTC_REG(0));
+	val &= ~(LINE_SDI | LINE_SEN | LINE_SCLK);
+	writel(val, rtc->regs + RTC_REG(0));
+}
+
+static int meson_rtc_wait_bus(struct meson_rtc *rtc, unsigned timeout_ms)
+{
+	unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
+	u32 val;
+
+	while (time_before(jiffies, timeout)) {
+		val = readl(rtc->regs + RTC_REG(1));
+		if (val & RTCREG1_READY)
+			return 1;
+
+		dev_dbg(rtc->dev, "%s: reg0=%08x reg1=%08x\n",
+			__func__, readl(rtc->regs + RTC_REG(0)), val);
+		msleep(10);
+	}
+
+	return 0;
+}
+
+static int meson_rtc_get_bus(struct meson_rtc *rtc)
+{
+	int ret, retries = 3;
+	u32 val;
+
+	val = readl(rtc->regs + RTC_REG(0));
+	val &= ~(LINE_SDI | LINE_SEN | LINE_SCLK);
+	writel(val, rtc->regs + RTC_REG(0));
+
+	while (retries) {
+		if (meson_rtc_wait_bus(rtc, 300))
+			return 0;
+
+		dev_warn(rtc->dev, "failed to get bus, re-setting\n");
+
+		retries--;
+		ret = reset_control_reset(rtc->reset);
+		if (ret)
+			return ret;
+	}
+
+	dev_err(rtc->dev, "%s: bus is not ready\n", __func__);
+	return -ETIMEDOUT;
+}
+
+static int meson_rtc_read(struct meson_rtc *rtc, unsigned int reg, u32 *data)
+{
+	int ret;
+
+	ret = meson_rtc_get_bus(rtc);
+	if (ret)
+		return ret;
+
+	meson_rtc_setline(rtc, LINE_SEN, 1);
+	meson_rtc_send_bits(rtc, reg, RTC_ADDR_BITS);
+	meson_rtc_set_dir(rtc, 0);
+	*data = meson_rtc_get_data(rtc);
+
+	return 0;
+}
+
+static int meson_rtc_write(struct meson_rtc *rtc, unsigned int reg, u32 data)
+{
+	int ret;
+
+	dev_dbg(rtc->dev, "%s: reg %d val %08x)\n", __func__, reg, data);
+
+	ret = meson_rtc_get_bus(rtc);
+	if (ret)
+		return ret;
+
+	meson_rtc_setline(rtc, LINE_SEN, 1);
+	meson_rtc_send_bits(rtc, data, RTC_DATA_BITS);
+	meson_rtc_send_bits(rtc, reg, RTC_ADDR_BITS);
+	meson_rtc_set_dir(rtc, 1);
+
+	return 0;
+}
+
+static int meson_rtc_gettime(struct device *dev, struct rtc_time *tm)
+{
+	struct meson_rtc *rtc = dev_get_drvdata(dev);
+	int ret;
+	u32 time;
+
+	mutex_lock(&rtc->lock);
+
+	ret = meson_rtc_read(rtc, RTC_COUNTER, &time);
+	if (!ret) {
+		rtc_time_to_tm(time, tm);
+		dev_dbg(dev, "read time %lu\n", (unsigned long)time);
+	}
+
+	mutex_unlock(&rtc->lock);
+	return ret;
+}
+
+static int meson_rtc_settime(struct device *dev, struct rtc_time *tm)
+{
+	struct meson_rtc *rtc = dev_get_drvdata(dev);
+	unsigned long time;
+	int ret;
+	
+	mutex_lock(&rtc->lock);
+
+	rtc_tm_to_time(tm, &time);
+	ret = meson_rtc_write(rtc, RTC_COUNTER, time);
+	
+	mutex_unlock(&rtc->lock);
+	return ret;
+}
+
+static const struct rtc_class_ops meson_rtc_ops = {
+	.read_time	= meson_rtc_gettime,
+	.set_time	= meson_rtc_settime,
+};
+
+static int meson_rtc_wait_serialiser(struct meson_rtc *rtc)
+{
+	unsigned long timeout = jiffies + msecs_to_jiffies(100);
+
+	while (time_before(jiffies, timeout)) {
+		if (!(readl(rtc->regs + RTC_REG(0)) & RTCREG0_WAIT_SER))
+			return 0;
+		msleep(10);
+	}
+
+	return -ETIMEDOUT;
+}
+
+static int meson_rtc_write_static(struct meson_rtc *rtc, u32 data)
+{
+	u32 tmp;
+
+	mutex_lock(&rtc->lock);
+
+	writel(data >> 8, rtc->regs + RTC_REG(4));
+
+	tmp = readl(rtc->regs + RTC_REG(0));
+	tmp &= ~RTC_REG0_DATA(0xff);
+	tmp |= RTC_REG0_DATA(data);
+	tmp |= RTCREG0_START_SER;
+
+	writel(tmp, rtc->regs + RTC_REG(0));
+
+	if (meson_rtc_wait_serialiser(rtc))
+		return -ETIMEDOUT;
+
+	dev_dbg(rtc->dev, "rtc_reg0 = %08x\n", readl(rtc->regs + RTC_REG(0)));
+	mutex_unlock(&rtc->lock);
+
+	return 0;
+}
+
+static int meson_rtc_probe(struct platform_device *pdev)
+{
+	struct meson_rtc *rtc;
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	u32 tm;
+	int ret;
+
+	rtc = devm_kzalloc(dev, sizeof(struct meson_rtc), GFP_KERNEL);
+	if (!rtc)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	rtc->regs = devm_ioremap_resource(dev, res);
+	rtc->dev = dev;
+
+	if (IS_ERR(rtc->regs))
+		return PTR_ERR(rtc->regs);
+	
+	mutex_init(&rtc->lock);
+	platform_set_drvdata(pdev, rtc);
+
+	ret = meson_rtc_write_static(rtc,
+				     MESON_STATIC_BIAS_CUR | MESON_STATIC_VOLTAGE);
+	if (ret) {
+		dev_err(dev, "failed to set static values\n");
+		return ret;
+	}
+
+	rtc->reset = devm_reset_control_get(dev, NULL);
+	if (IS_ERR(rtc->reset))
+		dev_warn(dev, "no reset available, rtc may not work\n");
+
+	/* check if we can read RTC counter, if not then the RTC is probably
+	 * not functional. If it isn't probably best to not bind */
+	ret = meson_rtc_read(rtc, RTC_COUNTER, &tm);
+	if (ret) {
+		dev_err(dev, "cannot read RTC counter, RTC not functional\n");
+		return ret;
+	}
+
+	rtc->rtc = devm_rtc_device_register(dev, "meson",
+					    &meson_rtc_ops, THIS_MODULE);
+	if (IS_ERR(rtc->rtc))
+		return PTR_ERR(rtc->rtc);
+
+	return 0;
+}
+
+static const struct of_device_id meson_rtc_dt_match[] = {
+	{ .compatible = "amlogic,meson6-rtc", },
+	{ .compatible = "amlogic,meson8-rtc", },
+	{ .compatible = "amlogic,meson8b-rtc", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, meson_rtc_dt_match);
+
+static struct platform_driver meson_rtc_driver = {
+	.probe		= meson_rtc_probe,
+	.driver		= {
+		.name	= "meson-rtc",
+		.of_match_table	= of_match_ptr(meson_rtc_dt_match),
+	},
+};
+module_platform_driver(meson_rtc_driver);
+
+MODULE_DESCRIPTION("AMLogic MESON RTC Driver");
+MODULE_AUTHOR("Ben Dooks <ben.doosk-4yDnlxn2s6sWdaTGBSpHTA@public.gmane.org>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:meson-rtc");
-- 
2.8.1

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[PATCH 2/4] meson-rtc: add device-tree binding

[Ben Dooks]

Add documentation for the AMLogic Meson RTC.

Signed-off-by: Ben Dooks <ben.dooks-4yDnlxn2s6sWdaTGBSpHTA@public.gmane.org>
---
 .../devicetree/bindings/rtc/rtc-amlogic.txt         | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rtc/rtc-amlogic.txt

diff --git a/Documentation/devicetree/bindings/rtc/rtc-amlogic.txt b/Documentation/devicetree/bindings/rtc/rtc-amlogic.txt
new file mode 100644
index 0000000..efc7672
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/rtc-amlogic.txt
@@ -0,0 +1,21 @@
+* AMlogic Meson RTC
+
+Required properties:
+- compatible: should be one of the following describing the hardware:
+	* "amlogic,meson6-rtc"
+	* "amlogic,meson8-rtc"
+	* "amlogic,meson8b-rtc"
+
+- reg: physical register space for the controller's memory mapped registers.
+
+Optional properties:
+- resets: reset controller reference to allow reset of the controller
+- interrupts: single interrupt reference if interrupt support needed
+
+Example:
+
+	rtc: rtc@c8100740 {
+		compatible = "amlogic,meson6-rtc";
+		reg = <0xc8100740 0x14>;
+		status = "disabled";
+	};
-- 
2.8.1

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[PATCH 3/4] ARM: dts: amlogic: add rtc node for meson8b

[Ben Dooks]

Add the DT node for the RTC support.

Signed-off-by: Ben Dooks <ben.dooks-4yDnlxn2s6sWdaTGBSpHTA@public.gmane.org>
---
 arch/arm/boot/dts/meson8b.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm/boot/dts/meson8b.dtsi b/arch/arm/boot/dts/meson8b.dtsi
index 2bfe401..ff97aa8 100644
--- a/arch/arm/boot/dts/meson8b.dtsi
+++ b/arch/arm/boot/dts/meson8b.dtsi
@@ -149,6 +149,13 @@
 			status = "disabled";
 		};
 
+		rtc: rtc@c8100740 {
+			compatible = "amlogic,meson8b-rtc";
+			reg = <0xc8100740 0x14>;
+			resets = <&reset RESET_RTC>;
+			status = "disabled";
+		};
+
 		clkc: clock-controller@c1104000 {
 			#clock-cells = <1>;
 			compatible = "amlogic,meson8b-clkc";
-- 
2.8.1

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[PATCH 4/4] ARM: meson: enable RTC for ODRoid-C1

[Ben Dooks]

Now the RTC node has been added, enable it on the ODroid-C1
board.

Signed-off-by: Ben Dooks <ben.dooks-4yDnlxn2s6sWdaTGBSpHTA@public.gmane.org>
---
 arch/arm/boot/dts/meson8b-odroidc1.dts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/boot/dts/meson8b-odroidc1.dts b/arch/arm/boot/dts/meson8b-odroidc1.dts
index e50f1a1..5c7826f 100644
--- a/arch/arm/boot/dts/meson8b-odroidc1.dts
+++ b/arch/arm/boot/dts/meson8b-odroidc1.dts
@@ -76,3 +76,8 @@
 	pinctrl-0 = <&uart_ao_a_pins>;
 	pinctrl-names = "default";
 };
+
+&rtc {
+	status = "okay";
+};
+
-- 
2.8.1

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Re: RTC support for AMlogic devies

[Kevin Hilman]

Ben Dooks <ben.dooks-4yDnlxn2s6sWdaTGBSpHTA@public.gmane.org> writes:

> This series is support for the RTC block on some of the AMLogic
> Meson ARM SoCs.
>
> The first patch is the driver, followed by device-tree patches
> and enablement for the ODRoid-C1 (where it has been tested)

In the cover letter, please be explicit about any dependencies that are
not upstream.  This series applies to mainline (v4.7-rc*) but does not
build.  I tested it with my v4.7/integ branch and it seems to work.

The series also has a handful of checkpatch warnings that should be
addressed (see: http://hastebin.com/tacurokasu.pas)

Other than that, I gave it a quick spin on meson8b-odroidc1 using
tools/testing/selftests/timers/rtctest.c, and the basic time stuff seems
to be working:

/ # ./rtctest

                        RTC Driver Test Example.


...Update IRQs not supported.


Current RTC date/time is 27-6-2016, 00:01:41.
RTC_ALM_READ ioctl: Invalid argument


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Re: RTC support for AMlogic devies

['Ben Dooks' via rtc-linux]

[-- Attachment #1: Type: text/plain, Size: 1993 bytes --]

I will check later. I think the issue is the dt patches require the reset
controller patches. The driver itself should compile fine
On 27 Jun 2016 6:18 p.m., "Kevin Hilman" <khilman-rdvid1DuHRBWk0Htik3J/w@public.gmane.org> wrote:

> Ben Dooks <ben.dooks-4yDnlxn2s6sWdaTGBSpHTA@public.gmane.org> writes:
>
> > This series is support for the RTC block on some of the AMLogic
> > Meson ARM SoCs.
> >
> > The first patch is the driver, followed by device-tree patches
> > and enablement for the ODRoid-C1 (where it has been tested)
>
> In the cover letter, please be explicit about any dependencies that are
> not upstream.  This series applies to mainline (v4.7-rc*) but does not
> build.  I tested it with my v4.7/integ branch and it seems to work.
>
> The series also has a handful of checkpatch warnings that should be
> addressed (see: http://hastebin.com/tacurokasu.pas)
>
> Other than that, I gave it a quick spin on meson8b-odroidc1 using
> tools/testing/selftests/timers/rtctest.c, and the basic time stuff seems
> to be working:
>
> / # ./rtctest
>
>                         RTC Driver Test Example.
>
>
> ...Update IRQs not supported.
>
>
> Current RTC date/time is 27-6-2016, 00:01:41.
> RTC_ALM_READ ioctl: Invalid argument
>
>
>
> _______________________________________________
> linux-amlogic mailing list
> linux-amlogic-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
> http://lists.infradead.org/mailman/listinfo/linux-amlogic
>

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Re: RTC support for AMlogic devies

[Ben Dooks]

On 27/06/16 18:18, Kevin Hilman wrote:
> Ben Dooks <ben.dooks-4yDnlxn2s6sWdaTGBSpHTA@public.gmane.org> writes:
> 
>> This series is support for the RTC block on some of the AMLogic
>> Meson ARM SoCs.
>>
>> The first patch is the driver, followed by device-tree patches
>> and enablement for the ODRoid-C1 (where it has been tested)
> 
> In the cover letter, please be explicit about any dependencies that are
> not upstream.  This series applies to mainline (v4.7-rc*) but does not
> build.  I tested it with my v4.7/integ branch and it seems to work.

I think this is just the DT bindings for the reset controller which
are currently in -next.

> The series also has a handful of checkpatch warnings that should be
> addressed (see: http://hastebin.com/tacurokasu.pas)

The msleep() ones I think are not a big isuse. The line length could
be solved, but at the moment is one of the few issues that are in the
rtc-meson.c driver.

The documentation one is solved by the patch adding the device-tree
binding information.

> Other than that, I gave it a quick spin on meson8b-odroidc1 using
> tools/testing/selftests/timers/rtctest.c, and the basic time stuff seems
> to be working:

Thank you.

-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius

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