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path: root/drivers/rtc/rtc-at91sam9.c
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Diffstat (limited to 'drivers/rtc/rtc-at91sam9.c')
-rw-r--r--drivers/rtc/rtc-at91sam9.c108
1 files changed, 36 insertions, 72 deletions
diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index 1d31c0ae6334..4daf3789b978 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -1,14 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0+
/*
* "RTT as Real Time Clock" driver for AT91SAM9 SoC family
*
* (C) 2007 Michel Benoit
*
* Based on rtc-at91rm9200.c by Rick Bronson
- *
- * 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>
@@ -47,21 +43,21 @@
* registers available, likewise usable for more than "RTC" support.
*/
-#define AT91_RTT_MR 0x00 /* Real-time Mode Register */
-#define AT91_RTT_RTPRES (0xffff << 0) /* Real-time Timer Prescaler Value */
-#define AT91_RTT_ALMIEN (1 << 16) /* Alarm Interrupt Enable */
-#define AT91_RTT_RTTINCIEN (1 << 17) /* Real Time Timer Increment Interrupt Enable */
-#define AT91_RTT_RTTRST (1 << 18) /* Real Time Timer Restart */
+#define AT91_RTT_MR 0x00 /* Real-time Mode Register */
+#define AT91_RTT_RTPRES (0xffff << 0) /* Timer Prescaler Value */
+#define AT91_RTT_ALMIEN BIT(16) /* Alarm Interrupt Enable */
+#define AT91_RTT_RTTINCIEN BIT(17) /* Increment Interrupt Enable */
+#define AT91_RTT_RTTRST BIT(18) /* Timer Restart */
-#define AT91_RTT_AR 0x04 /* Real-time Alarm Register */
-#define AT91_RTT_ALMV (0xffffffff) /* Alarm Value */
+#define AT91_RTT_AR 0x04 /* Real-time Alarm Register */
+#define AT91_RTT_ALMV (0xffffffff) /* Alarm Value */
-#define AT91_RTT_VR 0x08 /* Real-time Value Register */
-#define AT91_RTT_CRTV (0xffffffff) /* Current Real-time Value */
+#define AT91_RTT_VR 0x08 /* Real-time Value Register */
+#define AT91_RTT_CRTV (0xffffffff) /* Current Real-time Value */
-#define AT91_RTT_SR 0x0c /* Real-time Status Register */
-#define AT91_RTT_ALMS (1 << 0) /* Real-time Alarm Status */
-#define AT91_RTT_RTTINC (1 << 1) /* Real-time Timer Increment */
+#define AT91_RTT_SR 0x0c /* Real-time Status Register */
+#define AT91_RTT_ALMS BIT(0) /* Alarm Status */
+#define AT91_RTT_RTTINC BIT(1) /* Timer Increment */
/*
* We store ALARM_DISABLED in ALMV to record that no alarm is set.
@@ -69,14 +65,13 @@
*/
#define ALARM_DISABLED ((u32)~0)
-
struct sam9_rtc {
void __iomem *rtt;
struct rtc_device *rtcdev;
u32 imr;
struct regmap *gpbr;
unsigned int gpbr_offset;
- int irq;
+ int irq;
struct clk *sclk;
bool suspended;
unsigned long events;
@@ -122,7 +117,7 @@ static int at91_rtc_readtime(struct device *dev, struct rtc_time *tm)
if (secs != secs2)
secs = rtt_readl(rtc, VR);
- rtc_time_to_tm(offset + secs, tm);
+ rtc_time64_to_tm(offset + secs, tm);
dev_dbg(dev, "%s: %ptR\n", __func__, tm);
@@ -135,15 +130,12 @@ static int at91_rtc_readtime(struct device *dev, struct rtc_time *tm)
static int at91_rtc_settime(struct device *dev, struct rtc_time *tm)
{
struct sam9_rtc *rtc = dev_get_drvdata(dev);
- int err;
u32 offset, alarm, mr;
unsigned long secs;
dev_dbg(dev, "%s: %ptR\n", __func__, tm);
- err = rtc_tm_to_time(tm, &secs);
- if (err != 0)
- return err;
+ secs = rtc_tm_to_time64(tm);
mr = rtt_readl(rtc, MR);
@@ -193,7 +185,7 @@ static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
memset(alrm, 0, sizeof(*alrm));
if (alarm != ALARM_DISABLED && offset != 0) {
- rtc_time_to_tm(offset + alarm, tm);
+ rtc_time64_to_tm(offset + alarm, tm);
dev_dbg(dev, "%s: %ptR\n", __func__, tm);
@@ -211,11 +203,8 @@ static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
unsigned long secs;
u32 offset;
u32 mr;
- int err;
- err = rtc_tm_to_time(tm, &secs);
- if (err != 0)
- return err;
+ secs = rtc_tm_to_time64(tm);
offset = gpbr_readl(rtc);
if (offset == 0) {
@@ -263,7 +252,7 @@ static int at91_rtc_proc(struct device *dev, struct seq_file *seq)
u32 mr = rtt_readl(rtc, MR);
seq_printf(seq, "update_IRQ\t: %s\n",
- (mr & AT91_RTT_RTTINCIEN) ? "yes" : "no");
+ (mr & AT91_RTT_RTTINCIEN) ? "yes" : "no");
return 0;
}
@@ -299,7 +288,7 @@ static void at91_rtc_flush_events(struct sam9_rtc *rtc)
rtc->events = 0;
pr_debug("%s: num=%ld, events=0x%02lx\n", __func__,
- rtc->events >> 8, rtc->events & 0x000000FF);
+ rtc->events >> 8, rtc->events & 0x000000FF);
}
/*
@@ -340,13 +329,6 @@ static const struct rtc_class_ops at91_rtc_ops = {
.alarm_irq_enable = at91_rtc_alarm_irq_enable,
};
-static const struct regmap_config gpbr_regmap_config = {
- .name = "gpbr",
- .reg_bits = 32,
- .val_bits = 32,
- .reg_stride = 4,
-};
-
/*
* Initialize and install RTC driver
*/
@@ -357,6 +339,7 @@ static int at91_rtc_probe(struct platform_device *pdev)
int ret, irq;
u32 mr;
unsigned int sclk_rate;
+ struct of_phandle_args args;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
@@ -382,34 +365,14 @@ static int at91_rtc_probe(struct platform_device *pdev)
if (IS_ERR(rtc->rtt))
return PTR_ERR(rtc->rtt);
- if (!pdev->dev.of_node) {
- /*
- * TODO: Remove this code chunk when removing non DT board
- * support. Remember to remove the gpbr_regmap_config
- * variable too.
- */
- void __iomem *gpbr;
-
- r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
- gpbr = devm_ioremap_resource(&pdev->dev, r);
- if (IS_ERR(gpbr))
- return PTR_ERR(gpbr);
-
- rtc->gpbr = regmap_init_mmio(NULL, gpbr,
- &gpbr_regmap_config);
- } else {
- struct of_phandle_args args;
-
- ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node,
- "atmel,rtt-rtc-time-reg", 1, 0,
- &args);
- if (ret)
- return ret;
-
- rtc->gpbr = syscon_node_to_regmap(args.np);
- rtc->gpbr_offset = args.args[0];
- }
+ ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node,
+ "atmel,rtt-rtc-time-reg", 1, 0,
+ &args);
+ if (ret)
+ return ret;
+ rtc->gpbr = syscon_node_to_regmap(args.np);
+ rtc->gpbr_offset = args.args[0];
if (IS_ERR(rtc->gpbr)) {
dev_err(&pdev->dev, "failed to retrieve gpbr regmap, aborting.\n");
return -ENOMEM;
@@ -444,13 +407,15 @@ static int at91_rtc_probe(struct platform_device *pdev)
mr &= ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN);
rtt_writel(rtc, MR, mr);
- rtc->rtcdev = devm_rtc_device_register(&pdev->dev, pdev->name,
- &at91_rtc_ops, THIS_MODULE);
+ rtc->rtcdev = devm_rtc_allocate_device(&pdev->dev);
if (IS_ERR(rtc->rtcdev)) {
ret = PTR_ERR(rtc->rtcdev);
goto err_clk;
}
+ rtc->rtcdev->ops = &at91_rtc_ops;
+ rtc->rtcdev->range_max = U32_MAX;
+
/* register irq handler after we know what name we'll use */
ret = devm_request_irq(&pdev->dev, rtc->irq, at91_rtc_interrupt,
IRQF_SHARED | IRQF_COND_SUSPEND,
@@ -468,9 +433,9 @@ static int at91_rtc_probe(struct platform_device *pdev)
if (gpbr_readl(rtc) == 0)
dev_warn(&pdev->dev, "%s: SET TIME!\n",
- dev_name(&rtc->rtcdev->dev));
+ dev_name(&rtc->rtcdev->dev));
- return 0;
+ return rtc_register_device(rtc->rtcdev);
err_clk:
clk_disable_unprepare(rtc->sclk);
@@ -528,8 +493,9 @@ static int at91_rtc_suspend(struct device *dev)
/* don't let RTTINC cause wakeups */
if (mr & AT91_RTT_RTTINCIEN)
rtt_writel(rtc, MR, mr & ~AT91_RTT_RTTINCIEN);
- } else
+ } else {
rtt_writel(rtc, MR, mr & ~rtc->imr);
+ }
}
return 0;
@@ -561,13 +527,11 @@ static int at91_rtc_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(at91_rtc_pm_ops, at91_rtc_suspend, at91_rtc_resume);
-#ifdef CONFIG_OF
static const struct of_device_id at91_rtc_dt_ids[] = {
{ .compatible = "atmel,at91sam9260-rtt" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, at91_rtc_dt_ids);
-#endif
static struct platform_driver at91_rtc_driver = {
.probe = at91_rtc_probe,
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.