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rtc: add Alphascale asm9260 driver

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Add support for RTC controller found on Alphascale asm9260
SoC.

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Oleksij Rempel 2016-02-02 20:56:10 +01:00 committed by Alexandre Belloni
parent 6c6ff145b3
commit 125e550fd2
3 changed files with 366 additions and 0 deletions
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10
drivers/rtc/Kconfig
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@ -1152,6 +1152,16 @@ config RTC_DRV_ZYNQMP
comment "on-CPU RTC drivers"
config RTC_DRV_ASM9260
tristate "Alphascale asm9260 RTC"
depends on MACH_ASM9260
help
If you say yes here you get support for the RTC on the
Alphascale asm9260 SoC.
This driver can also be built as a module. If so, the module
will be called rtc-asm9260.
config RTC_DRV_DAVINCI
tristate "TI DaVinci RTC"
depends on ARCH_DAVINCI_DM365

1
drivers/rtc/Makefile
View File

@ -28,6 +28,7 @@ obj-$(CONFIG_RTC_DRV_ABB5ZES3) += rtc-ab-b5ze-s3.o
obj-$(CONFIG_RTC_DRV_ABX80X) += rtc-abx80x.o
obj-$(CONFIG_RTC_DRV_ARMADA38X) += rtc-armada38x.o
obj-$(CONFIG_RTC_DRV_AS3722) += rtc-as3722.o
obj-$(CONFIG_RTC_DRV_ASM9260) += rtc-asm9260.o
obj-$(CONFIG_RTC_DRV_AT32AP700X)+= rtc-at32ap700x.o
obj-$(CONFIG_RTC_DRV_AT91RM9200)+= rtc-at91rm9200.o
obj-$(CONFIG_RTC_DRV_AT91SAM9) += rtc-at91sam9.o

355
drivers/rtc/rtc-asm9260.c Normal file
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@ -0,0 +1,355 @@
/*
* Copyright (C) 2016 Oleksij Rempel <linux@rempel-privat.de>
*
* 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/clk.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
/* Miscellaneous registers */
/* Interrupt Location Register */
#define HW_ILR 0x00
#define BM_RTCALF BIT(1)
#define BM_RTCCIF BIT(0)
/* Clock Control Register */
#define HW_CCR 0x08
/* Calibration counter disable */
#define BM_CCALOFF BIT(4)
/* Reset internal oscillator divider */
#define BM_CTCRST BIT(1)
/* Clock Enable */
#define BM_CLKEN BIT(0)
/* Counter Increment Interrupt Register */
#define HW_CIIR 0x0C
#define BM_CIIR_IMYEAR BIT(7)
#define BM_CIIR_IMMON BIT(6)
#define BM_CIIR_IMDOY BIT(5)
#define BM_CIIR_IMDOW BIT(4)
#define BM_CIIR_IMDOM BIT(3)
#define BM_CIIR_IMHOUR BIT(2)
#define BM_CIIR_IMMIN BIT(1)
#define BM_CIIR_IMSEC BIT(0)
/* Alarm Mask Register */
#define HW_AMR 0x10
#define BM_AMR_IMYEAR BIT(7)
#define BM_AMR_IMMON BIT(6)
#define BM_AMR_IMDOY BIT(5)
#define BM_AMR_IMDOW BIT(4)
#define BM_AMR_IMDOM BIT(3)
#define BM_AMR_IMHOUR BIT(2)
#define BM_AMR_IMMIN BIT(1)
#define BM_AMR_IMSEC BIT(0)
#define BM_AMR_OFF 0xff
/* Consolidated time registers */
#define HW_CTIME0 0x14
#define BM_CTIME0_DOW_S 24
#define BM_CTIME0_DOW_M 0x7
#define BM_CTIME0_HOUR_S 16
#define BM_CTIME0_HOUR_M 0x1f
#define BM_CTIME0_MIN_S 8
#define BM_CTIME0_MIN_M 0x3f
#define BM_CTIME0_SEC_S 0
#define BM_CTIME0_SEC_M 0x3f
#define HW_CTIME1 0x18
#define BM_CTIME1_YEAR_S 16
#define BM_CTIME1_YEAR_M 0xfff
#define BM_CTIME1_MON_S 8
#define BM_CTIME1_MON_M 0xf
#define BM_CTIME1_DOM_S 0
#define BM_CTIME1_DOM_M 0x1f
#define HW_CTIME2 0x1C
#define BM_CTIME2_DOY_S 0
#define BM_CTIME2_DOY_M 0xfff
/* Time counter registers */
#define HW_SEC 0x20
#define HW_MIN 0x24
#define HW_HOUR 0x28
#define HW_DOM 0x2C
#define HW_DOW 0x30
#define HW_DOY 0x34
#define HW_MONTH 0x38
#define HW_YEAR 0x3C
#define HW_CALIBRATION 0x40
#define BM_CALDIR_BACK BIT(17)
#define BM_CALVAL_M 0x1ffff
/* General purpose registers */
#define HW_GPREG0 0x44
#define HW_GPREG1 0x48
#define HW_GPREG2 0x4C
#define HW_GPREG3 0x50
#define HW_GPREG4 0x54
/* Alarm register group */
#define HW_ALSEC 0x60
#define HW_ALMIN 0x64
#define HW_ALHOUR 0x68
#define HW_ALDOM 0x6C
#define HW_ALDOW 0x70
#define HW_ALDOY 0x74
#define HW_ALMON 0x78
#define HW_ALYEAR 0x7C
struct asm9260_rtc_priv {
struct device *dev;
void __iomem *iobase;
struct rtc_device *rtc;
struct clk *clk;
/* io lock */
spinlock_t lock;
};
static irqreturn_t asm9260_rtc_irq(int irq, void *dev_id)
{
struct asm9260_rtc_priv *priv = dev_id;
u32 isr;
unsigned long events = 0;
isr = ioread32(priv->iobase + HW_CIIR);
if (!isr)
return IRQ_NONE;
iowrite32(0, priv->iobase + HW_CIIR);
events |= RTC_AF | RTC_IRQF;
rtc_update_irq(priv->rtc, 1, events);
return IRQ_HANDLED;
}
static int asm9260_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct asm9260_rtc_priv *priv = dev_get_drvdata(dev);
u32 ctime0, ctime1, ctime2;
unsigned long irq_flags;
spin_lock_irqsave(&priv->lock, irq_flags);
ctime0 = ioread32(priv->iobase + HW_CTIME0);
ctime1 = ioread32(priv->iobase + HW_CTIME1);
ctime2 = ioread32(priv->iobase + HW_CTIME2);
if (ctime1 != ioread32(priv->iobase + HW_CTIME1)) {
/*
* woops, counter flipped right now. Now we are safe
* to reread.
*/
ctime0 = ioread32(priv->iobase + HW_CTIME0);
ctime1 = ioread32(priv->iobase + HW_CTIME1);
ctime2 = ioread32(priv->iobase + HW_CTIME2);
}
spin_unlock_irqrestore(&priv->lock, irq_flags);
tm->tm_sec = (ctime0 >> BM_CTIME0_SEC_S) & BM_CTIME0_SEC_M;
tm->tm_min = (ctime0 >> BM_CTIME0_MIN_S) & BM_CTIME0_MIN_M;
tm->tm_hour = (ctime0 >> BM_CTIME0_HOUR_S) & BM_CTIME0_HOUR_M;
tm->tm_wday = (ctime0 >> BM_CTIME0_DOW_S) & BM_CTIME0_DOW_M;
tm->tm_mday = (ctime1 >> BM_CTIME1_DOM_S) & BM_CTIME1_DOM_M;
tm->tm_mon = (ctime1 >> BM_CTIME1_MON_S) & BM_CTIME1_MON_M;
tm->tm_year = (ctime1 >> BM_CTIME1_YEAR_S) & BM_CTIME1_YEAR_M;
tm->tm_yday = (ctime2 >> BM_CTIME2_DOY_S) & BM_CTIME2_DOY_M;
return 0;
}
static int asm9260_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct asm9260_rtc_priv *priv = dev_get_drvdata(dev);
unsigned long irq_flags;
spin_lock_irqsave(&priv->lock, irq_flags);
/*
* make sure SEC counter will not flip other counter on write time,
* real value will be written at the enf of sequence.
*/
iowrite32(0, priv->iobase + HW_SEC);
iowrite32(tm->tm_year, priv->iobase + HW_YEAR);
iowrite32(tm->tm_mon, priv->iobase + HW_MONTH);
iowrite32(tm->tm_mday, priv->iobase + HW_DOM);
iowrite32(tm->tm_wday, priv->iobase + HW_DOW);
iowrite32(tm->tm_yday, priv->iobase + HW_DOY);
iowrite32(tm->tm_hour, priv->iobase + HW_HOUR);
iowrite32(tm->tm_min, priv->iobase + HW_MIN);
iowrite32(tm->tm_sec, priv->iobase + HW_SEC);
spin_unlock_irqrestore(&priv->lock, irq_flags);
return 0;
}
static int asm9260_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct asm9260_rtc_priv *priv = dev_get_drvdata(dev);
unsigned long irq_flags;
spin_lock_irqsave(&priv->lock, irq_flags);
alrm->time.tm_year = ioread32(priv->iobase + HW_ALYEAR);
alrm->time.tm_mon = ioread32(priv->iobase + HW_ALMON);
alrm->time.tm_mday = ioread32(priv->iobase + HW_ALDOM);
alrm->time.tm_wday = ioread32(priv->iobase + HW_ALDOW);
alrm->time.tm_yday = ioread32(priv->iobase + HW_ALDOY);
alrm->time.tm_hour = ioread32(priv->iobase + HW_ALHOUR);
alrm->time.tm_min = ioread32(priv->iobase + HW_ALMIN);
alrm->time.tm_sec = ioread32(priv->iobase + HW_ALSEC);
alrm->enabled = ioread32(priv->iobase + HW_AMR) ? 1 : 0;
alrm->pending = ioread32(priv->iobase + HW_CIIR) ? 1 : 0;
spin_unlock_irqrestore(&priv->lock, irq_flags);
return rtc_valid_tm(&alrm->time);
}
static int asm9260_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct asm9260_rtc_priv *priv = dev_get_drvdata(dev);
unsigned long irq_flags;
spin_lock_irqsave(&priv->lock, irq_flags);
iowrite32(alrm->time.tm_year, priv->iobase + HW_ALYEAR);
iowrite32(alrm->time.tm_mon, priv->iobase + HW_ALMON);
iowrite32(alrm->time.tm_mday, priv->iobase + HW_ALDOM);
iowrite32(alrm->time.tm_wday, priv->iobase + HW_ALDOW);
iowrite32(alrm->time.tm_yday, priv->iobase + HW_ALDOY);
iowrite32(alrm->time.tm_hour, priv->iobase + HW_ALHOUR);
iowrite32(alrm->time.tm_min, priv->iobase + HW_ALMIN);
iowrite32(alrm->time.tm_sec, priv->iobase + HW_ALSEC);
iowrite32(alrm->enabled ? 0 : BM_AMR_OFF, priv->iobase + HW_AMR);
spin_unlock_irqrestore(&priv->lock, irq_flags);
return 0;
}
static int asm9260_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
struct asm9260_rtc_priv *priv = dev_get_drvdata(dev);
iowrite32(enabled ? 0 : BM_AMR_OFF, priv->iobase + HW_AMR);
return 0;
}
static const struct rtc_class_ops asm9260_rtc_ops = {
.read_time = asm9260_rtc_read_time,
.set_time = asm9260_rtc_set_time,
.read_alarm = asm9260_rtc_read_alarm,
.set_alarm = asm9260_rtc_set_alarm,
.alarm_irq_enable = asm9260_alarm_irq_enable,
};
static int __init asm9260_rtc_probe(struct platform_device *pdev)
{
struct asm9260_rtc_priv *priv;
struct device *dev = &pdev->dev;
struct resource *res;
int irq_alarm, ret;
u32 ccr;
priv = devm_kzalloc(dev, sizeof(struct asm9260_rtc_priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->dev = &pdev->dev;
platform_set_drvdata(pdev, priv);
irq_alarm = platform_get_irq(pdev, 0);
if (irq_alarm < 0) {
dev_err(dev, "No alarm IRQ resource defined\n");
return irq_alarm;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
priv->iobase = devm_ioremap_resource(dev, res);
if (IS_ERR(priv->iobase))
return PTR_ERR(priv->iobase);
priv->clk = devm_clk_get(dev, "ahb");
ret = clk_prepare_enable(priv->clk);
if (ret) {
dev_err(dev, "Failed to enable clk!\n");
return ret;
}
ccr = ioread32(priv->iobase + HW_CCR);
/* if dev is not enabled, reset it */
if ((ccr & (BM_CLKEN | BM_CTCRST)) != BM_CLKEN) {
iowrite32(BM_CTCRST, priv->iobase + HW_CCR);
ccr = 0;
}
iowrite32(BM_CLKEN | ccr, priv->iobase + HW_CCR);
iowrite32(0, priv->iobase + HW_CIIR);
iowrite32(BM_AMR_OFF, priv->iobase + HW_AMR);
priv->rtc = devm_rtc_device_register(dev, dev_name(dev),
&asm9260_rtc_ops, THIS_MODULE);
if (IS_ERR(priv->rtc)) {
ret = PTR_ERR(priv->rtc);
dev_err(dev, "Failed to register RTC device: %d\n", ret);
goto err_return;
}
ret = devm_request_threaded_irq(dev, irq_alarm, NULL,
asm9260_rtc_irq, IRQF_ONESHOT,
dev_name(dev), priv);
if (ret < 0) {
dev_err(dev, "can't get irq %i, err %d\n",
irq_alarm, ret);
goto err_return;
}
return 0;
err_return:
clk_disable_unprepare(priv->clk);
return ret;
}
static int __exit asm9260_rtc_remove(struct platform_device *pdev)
{
struct asm9260_rtc_priv *priv = platform_get_drvdata(pdev);
/* Disable alarm matching */
iowrite32(BM_AMR_OFF, priv->iobase + HW_AMR);
clk_disable_unprepare(priv->clk);
return 0;
}
static const struct of_device_id asm9260_dt_ids[] = {
{ .compatible = "alphascale,asm9260-rtc", },
{}
};
static struct platform_driver asm9260_rtc_driver = {
.probe = asm9260_rtc_probe,
.remove = asm9260_rtc_remove,
.driver = {
.name = "asm9260-rtc",
.owner = THIS_MODULE,
.of_match_table = asm9260_dt_ids,
},
};
module_platform_driver(asm9260_rtc_driver);
MODULE_AUTHOR("Oleksij Rempel <linux@rempel-privat.de>");
MODULE_DESCRIPTION("Alphascale asm9260 SoC Realtime Clock Driver (RTC)");
MODULE_LICENSE("GPL");