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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>
Signed-off-by: maoxiaochuan <maoxiaochuan@loongson.cn>
This commit is contained in:
maoxiaochuan
2026-08-24 14:17:19 +08:00
parent 5f88366873
commit b75aa49c40
1 changed files with 51 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/rtc/rtc-loongson.c
+51 -7
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,
@@ -104,7 +110,7 @@ static const struct loongson_rtc_config ls2k1000_rtc_config = {
static const struct loongson_rtc_config ls2k_gen_rtc_config = {
.pm_offset = 0x0,
.flags = 0,
.flags = LOONGSON_RTC_ALARM_WORKAROUND,
};
static const struct regmap_config loongson_rtc_regmap_config = {
@@ -150,7 +156,7 @@ 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 */
@@ -164,7 +170,7 @@ 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);
@@ -296,9 +302,41 @@ 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;
@@ -326,7 +364,7 @@ static int loongson_rtc_probe(struct platform_device *pdev)
if (IS_ERR(priv->rtcdev))
return dev_err_probe(dev, PTR_ERR(priv->rtcdev),
"devm_rtc_allocate_device failed\n");
#if 0
/* Get RTC alarm irq */
/* 发现 2k300 不需要中断 开了中断就会导致无法读写 */
/* 所以 pm_offset == 0 代表不需要中断 */
@@ -348,6 +386,11 @@ static int loongson_rtc_probe(struct platform_device *pdev)
/* Loongson-1C RTC does not support alarm */
clear_bit(RTC_FEATURE_ALARM, priv->rtcdev->features);
}
#endif
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);
@@ -378,6 +421,7 @@ 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 },
{ .compatible = "loongson,ls2k-rtc", .data = &ls2k_gen_rtc_config },
{ /* sentinel */ }