On 2025/6/13 上午9:31, Xianglai Li wrote:
Add the acpi table to the loongson rtc hardware
so that the virtual machine kernel can use the
loongson RTC-related drivers.
Signed-off-by: Xianglai Li <lixiang...@loongson.cn>
---
Cc: Bibo Mao <maob...@loongson.cn>
Cc: Song Gao <gaos...@loongson.cn>
Cc: Jiaxun Yang <jiaxun.y...@flygoat.com>
Cc: Xianglai Li <lixiang...@loongson.cn>
hw/loongarch/virt-acpi-build.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/hw/loongarch/virt-acpi-build.c b/hw/loongarch/virt-acpi-build.c
index 2cd2d9d842..2cfc5421c5 100644
--- a/hw/loongarch/virt-acpi-build.c
+++ b/hw/loongarch/virt-acpi-build.c
@@ -473,6 +473,29 @@ static void acpi_dsdt_add_tpm(Aml *scope,
LoongArchVirtMachineState *vms)
}
#endif
+static void acpi_dsdt_add_rtc(Aml *scope)
+{
+ uint32_t rtc_irq = VIRT_RTC_IRQ;
+ Aml *dev = aml_device("RTC");
+
+ aml_append(dev, aml_name_decl("_HID", aml_string("LOON0001")));
+ aml_append(dev, aml_name_decl("_UID", aml_int(0)));
+
+ Aml *crs = aml_resource_template();
+ aml_append(crs,
+ aml_qword_memory(AML_POS_DECODE, AML_MIN_FIXED, AML_MAX_FIXED,
+ AML_NON_CACHEABLE, AML_READ_WRITE,
+ 0, VIRT_RTC_REG_BASE,
+ VIRT_RTC_REG_BASE + VIRT_RTC_LEN - 1,
+ 0, VIRT_RTC_LEN));
+ aml_append(crs,
+ aml_interrupt(AML_CONSUMER, AML_EDGE, AML_ACTIVE_HIGH,
+ AML_EXCLUSIVE, &rtc_irq, 1));
+
+ aml_append(dev, aml_name_decl("_CRS", crs));
+ aml_append(scope, dev);
+}
+
The rtc loongson driver drivers/rtc/rtc-loongson.c is bond with acpi pm1
device since rtc device is wake-up source on physical machine, however
acpi ged device rather than pm1 device is used on virt machine.
I think firstly we should submit patch to rtc loongson driver
drivers/rtc/rtc-loongson.c so that it supports non acpi pm1 device, then
submit rtc acpi dsdt table.
Regards
Bibo Mao
/* build DSDT */
static void
build_dsdt(GArray *table_data, BIOSLinker *linker, MachineState *machine)
@@ -488,6 +511,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
MachineState *machine)
for (i = 0; i < VIRT_UART_COUNT; i++) {
build_uart_device_aml(dsdt, i);
}
+ acpi_dsdt_add_rtc(dsdt);
build_pci_device_aml(dsdt, lvms);
build_la_ged_aml(dsdt, machine);
build_flash_aml(dsdt, lvms);
