arm64/ascend: enable ascend features for Ascend910 platform

ascend inclusion
category: feature
bugzilla: NA
CVE: NA

-------------------------------------------------

The Ascend910 platform only use the acpi mode to boot system,
the oem message is recorded in the oem_table_id of IORT table,
so use the oem message to enable the ascend features.
Signed-off-by: NDing Tianhong <dingtianhong@huawei.com>
Reviewed-by: NHanjun Guo <guohanjun@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

arch/arm64/mm/init.c

@@ -769,7 +769,7 @@ __setup("keepinitrd", keepinitrd_setup);
 #endif
 
 #ifdef CONFIG_ASCEND_FEATURES
-static int __init ascend_enable_setup(char *__unused)
+void ascend_enable_all_features(void)
 {
 	if (IS_ENABLED(CONFIG_ASCEND_DVPP_MMAP))
 		enable_mmap_dvpp = 1;
@@ -782,6 +782,11 @@ static int __init ascend_enable_setup(char *__unused)
 
 	if (IS_ENABLED(CONFIG_SUSPEND))
 		mem_sleep_current = PM_SUSPEND_ON;
+}
+
+static int __init ascend_enable_setup(char *__unused)
+{
+	ascend_enable_all_features();
 
 	return 1;
 }

drivers/acpi/arm64/iort.c

@@ -25,6 +25,7 @@
 #include <linux/pci.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
+#include <linux/init.h>
 
 #define IORT_TYPE_MASK(type)	(1 << (type))
 #define IORT_MSI_TYPE		(1 << ACPI_IORT_NODE_ITS_GROUP)
@@ -1639,6 +1640,26 @@ static void __init iort_init_platform_devices(void)
 	}
 }
 
+/*
+ * This function detects the ascend platform by oem table id.
+ */
+static bool ascend_platform_detected(struct acpi_table_header *h)
+{
+	if (!memcmp(h->oem_table_id, "HI19801P", ACPI_OEM_TABLE_ID_SIZE))
+		return true;
+
+	if (!memcmp(h->oem_table_id, "HI19802P", ACPI_OEM_TABLE_ID_SIZE))
+		return true;
+
+	if (!memcmp(h->oem_table_id, "HI19804P", ACPI_OEM_TABLE_ID_SIZE))
+		return true;
+
+	if (!memcmp(h->oem_table_id, "HI1980\0\0", ACPI_OEM_TABLE_ID_SIZE))
+		return true;
+
+	return false;
+}
+
 void __init acpi_iort_init(void)
 {
 	acpi_status status;
@@ -1654,5 +1675,8 @@ void __init acpi_iort_init(void)
 		return;
 	}
 
+	if (ascend_platform_detected(iort_table))
+		ascend_enable_all_features();
+
 	iort_init_platform_devices();
 }

include/linux/init.h

@@ -306,4 +306,11 @@ void __init parse_early_options(char *cmdline);
 #define __exit_p(x) NULL
 #endif
 
+#ifndef __ASSEMBLY__
+#ifdef CONFIG_ASCEND_FEATURES
+extern void ascend_enable_all_features(void);
+#else
+static inline void ascend_enable_all_features(void) { }
+#endif
+#endif
 #endif /* _LINUX_INIT_H */