We add common riscv_fw_parent_hartid() which help device drivers
to get parent hartid of the INTC (i.e. local interrupt controller)
fwnode. This should work for both DT and ACPI.
Signed-off-by: Anup Patel <apatel@xxxxxxxxxxxxxxxx>
---
arch/riscv/include/asm/processor.h | 3 +++
arch/riscv/kernel/cpu.c | 16 ++++++++++++++++
2 files changed, 19 insertions(+)
diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
index c950a8d9edef..39dc23a18f88 100644
--- a/arch/riscv/include/asm/processor.h
+++ b/arch/riscv/include/asm/processor.h
@@ -81,6 +81,9 @@ int riscv_of_processor_hartid(struct device_node *node, unsigned long *hartid);
int riscv_early_of_processor_hartid(struct device_node *node, unsigned long *hartid);
int riscv_of_parent_hartid(struct device_node *node, unsigned long *hartid);
+struct fwnode_handle;
+int riscv_fw_parent_hartid(struct fwnode_handle *node, unsigned long *hartid);
+
extern void riscv_fill_hwcap(void);
extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
index a2fc952318e9..9be9b3b1f333 100644
--- a/arch/riscv/kernel/cpu.c
+++ b/arch/riscv/kernel/cpu.c
@@ -96,6 +96,22 @@ int riscv_of_parent_hartid(struct device_node *node, unsigned long *hartid)
return -1;
}
+/* Find hart ID of the CPU fwnode under which given fwnode falls. */
+int riscv_fw_parent_hartid(struct fwnode_handle *node, unsigned long *hartid)
+{
+ int rc;
+ u64 temp;
+
+ if (!is_of_node(node)) {
+ rc = fwnode_property_read_u64_array(node, "hartid", &temp, 1);
+ if (!rc)
+ *hartid = temp;
+ } else
+ rc = riscv_of_parent_hartid(to_of_node(node), hartid);
+
+ return rc;
+}
+
DEFINE_PER_CPU(struct riscv_cpuinfo, riscv_cpuinfo);
unsigned long riscv_cached_mvendorid(unsigned int cpu_id)
--
2.34.1
