diff options
Diffstat (limited to 'arch/riscv/kernel')
| -rw-r--r-- | arch/riscv/kernel/irq.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/arch/riscv/kernel/irq.c b/arch/riscv/kernel/irq.c index 9ceda02507ca..b6af20bc300f 100644 --- a/arch/riscv/kernel/irq.c +++ b/arch/riscv/kernel/irq.c @@ -32,6 +32,40 @@ struct fwnode_handle *riscv_get_intc_hwnode(void) } EXPORT_SYMBOL_GPL(riscv_get_intc_hwnode); +/** + * riscv_get_hart_index() - get hart index for interrupt delivery + * @fwnode: interrupt controller node + * @logical_index: index within the "interrupts-extended" property + * @hart_index: filled with the hart index to use + * + * RISC-V uses term "hart index" for its interrupt controllers, for the + * purpose of the interrupt routing to destination harts. + * It may be arbitrary numbers assigned to each destination hart in context + * of the particular interrupt domain. + * + * These numbers encoded in the optional property "riscv,hart-indexes" + * that should contain hart index for each interrupt destination in the same + * order as in the "interrupts-extended" property. If this property + * not exist, it assumed equal to the logical index, i.e. index within the + * "interrupts-extended" property. + * + * Return: error code + */ +int riscv_get_hart_index(struct fwnode_handle *fwnode, u32 logical_index, + u32 *hart_index) +{ + static const char *prop_hart_index = "riscv,hart-indexes"; + struct device_node *np = to_of_node(fwnode); + + if (!np || !of_property_present(np, prop_hart_index)) { + *hart_index = logical_index; + return 0; + } + + return of_property_read_u32_index(np, prop_hart_index, + logical_index, hart_index); +} + #ifdef CONFIG_IRQ_STACKS #include <asm/irq_stack.h> |