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rtc: loongson: Add Loongson-2K0300 support

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The Loongson-2K0300's rtc hardware design is similar to that of the
Loongson-1B, but it does not support the alarm feature.

Introduce `LOONGSON_RTC_ALARM_WORKAROUND`, which indicates a chip that
does not support the alarm feature, and rewrite the related logic in
`loongson_rtc_alarm_setting()`.

Reviewed-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Link: https://patch.msgid.link/abff68dda2fe6a6601a9e58b31e278d941297fce.1768616276.git.zhoubinbin@loongson.cn
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Binbin Zhou 2026-01-17 10:26:50 +08:00 • committed by Alexandre Belloni
parent 5d4899d485
commit 770a54accf
1 changed files with 47 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

71
drivers/rtc/rtc-loongson.c
View file

@ -66,7 +66,8 @@
* According to the LS1C manual, RTC_CTRL and alarm-related registers are not defined.
* Accessing the relevant registers will cause the system to hang.
*/
#define LS1C_RTC_CTRL_WORKAROUND BIT(0)
#define LOONGSON_RTC_CTRL_WORKAROUND BIT(0)
#define LOONGSON_RTC_ALARM_WORKAROUND BIT(1)
struct loongson_rtc_config {
u32 pm_offset; /* Offset of PM domain, for RTC alarm wakeup */
@ -89,7 +90,7 @@ static const struct loongson_rtc_config ls1b_rtc_config = {
static const struct loongson_rtc_config ls1c_rtc_config = {
.pm_offset = 0,
.flags = LS1C_RTC_CTRL_WORKAROUND,
.flags = LOONGSON_RTC_CTRL_WORKAROUND | LOONGSON_RTC_ALARM_WORKAROUND,
};
static const struct loongson_rtc_config generic_rtc_config = {
@ -97,6 +98,11 @@ static const struct loongson_rtc_config generic_rtc_config = {
.flags = 0,
};
static const struct loongson_rtc_config ls2k0300_rtc_config = {
.pm_offset = 0x0,
.flags = LOONGSON_RTC_ALARM_WORKAROUND,
};
static const struct loongson_rtc_config ls2k1000_rtc_config = {
.pm_offset = 0x800,
.flags = 0,
@ -153,7 +159,7 @@ static int loongson_rtc_set_enabled(struct device *dev)
{
struct loongson_rtc_priv *priv = dev_get_drvdata(dev);
if (priv->config->flags & LS1C_RTC_CTRL_WORKAROUND)
if (priv->config->flags & LOONGSON_RTC_CTRL_WORKAROUND)
return 0;
/* Enable RTC TOY counters and crystal */
@ -167,7 +173,7 @@ static bool loongson_rtc_get_enabled(struct device *dev)
u32 ctrl_data;
struct loongson_rtc_priv *priv = dev_get_drvdata(dev);
if (priv->config->flags & LS1C_RTC_CTRL_WORKAROUND)
if (priv->config->flags & LOONGSON_RTC_CTRL_WORKAROUND)
return true;
ret = regmap_read(priv->regmap, RTC_CTRL_REG, &ctrl_data);
@ -299,9 +305,41 @@ static const struct rtc_class_ops loongson_rtc_ops = {
.alarm_irq_enable = loongson_rtc_alarm_irq_enable,
};
static int loongson_rtc_alarm_setting(struct platform_device *pdev, void __iomem *regs)
{
int ret = 0, alarm_irq;
struct device *dev = &pdev->dev;
struct loongson_rtc_priv *priv = dev_get_drvdata(dev);
if (priv->config->flags & LOONGSON_RTC_ALARM_WORKAROUND) {
/* Loongson-1C/Loongson-2K0300 RTC does not support alarm */
clear_bit(RTC_FEATURE_ALARM, priv->rtcdev->features);
return 0;
}
/* Get RTC alarm irq */
alarm_irq = platform_get_irq(pdev, 0);
if (alarm_irq < 0)
return alarm_irq;
ret = devm_request_irq(dev, alarm_irq, loongson_rtc_isr, 0, "loongson-alarm",
priv);
if (ret < 0)
return ret;
priv->pm_base = regs - priv->config->pm_offset;
device_init_wakeup(dev, true);
if (has_acpi_companion(dev))
acpi_install_fixed_event_handler(ACPI_EVENT_RTC,
loongson_rtc_handler, priv);
return ret;
}
static int loongson_rtc_probe(struct platform_device *pdev)
{
int ret, alarm_irq;
int ret;
void __iomem *regs;
struct loongson_rtc_priv *priv;
struct device *dev = &pdev->dev;
@ -330,25 +368,9 @@ static int loongson_rtc_probe(struct platform_device *pdev)
return dev_err_probe(dev, PTR_ERR(priv->rtcdev),
"devm_rtc_allocate_device failed\n");
/* Get RTC alarm irq */
alarm_irq = platform_get_irq(pdev, 0);
if (alarm_irq > 0) {
ret = devm_request_irq(dev, alarm_irq, loongson_rtc_isr,
0, "loongson-alarm", priv);
if (ret < 0)
return dev_err_probe(dev, ret, "Unable to request irq %d\n",
alarm_irq);
priv->pm_base = regs - priv->config->pm_offset;
device_init_wakeup(dev, true);
if (has_acpi_companion(dev))
acpi_install_fixed_event_handler(ACPI_EVENT_RTC,
loongson_rtc_handler, priv);
} else {
/* Loongson-1C RTC does not support alarm */
clear_bit(RTC_FEATURE_ALARM, priv->rtcdev->features);
}
ret = loongson_rtc_alarm_setting(pdev, regs);
if (ret)
return ret;
/* Loongson RTC does not support UIE */
clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, priv->rtcdev->features);
@ -379,6 +401,7 @@ static const struct of_device_id loongson_rtc_of_match[] = {
{ .compatible = "loongson,ls1b-rtc", .data = &ls1b_rtc_config },
{ .compatible = "loongson,ls1c-rtc", .data = &ls1c_rtc_config },
{ .compatible = "loongson,ls7a-rtc", .data = &generic_rtc_config },
{ .compatible = "loongson,ls2k0300-rtc", .data = &ls2k0300_rtc_config },
{ .compatible = "loongson,ls2k1000-rtc", .data = &ls2k1000_rtc_config },
{ /* sentinel */ }
};