Commit 0c60a31c authored by Anup Patel's avatar Anup Patel Committed by Marc Zyngier
Browse files

irqchip/riscv-intc: Allow drivers to directly discover INTC hwnode 



Various RISC-V drivers (such as SBI IPI, SBI Timer, SBI PMU, and
KVM RISC-V) don't have associated DT node but these drivers need
standard per-CPU (local) interrupts defined by the RISC-V privileged
specification.

We add riscv_get_intc_hwnode() in arch/riscv which allows RISC-V
drivers not having DT node to discover INTC hwnode which in-turn
helps these drivers to map per-CPU (local) interrupts provided
by the INTC driver.

Signed-off-by: default avatarAnup Patel <apatel@ventanamicro.com>
Reviewed-by: default avatarAtish Patra <atishp@rivosinc.com>
Acked-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230328035223.1480939-3-apatel@ventanamicro.com
parent 3ee92565

arch/riscv/include/asm/irq.h

+4 −0
Original line number Diff line number Diff line
@@ -12,6 +12,10 @@ 


#include <asm-generic/irq.h>



void riscv_set_intc_hwnode_fn(struct fwnode_handle *(*fn)(void));



struct fwnode_handle *riscv_get_intc_hwnode(void);



extern void __init init_IRQ(void);



#endif /* _ASM_RISCV_IRQ_H */

arch/riscv/kernel/irq.c

+18 −0
Original line number Diff line number Diff line
@@ -7,9 +7,27 @@ 


#include <linux/interrupt.h>

#include <linux/irqchip.h>

#include <linux/irqdomain.h>

#include <linux/module.h>

#include <linux/seq_file.h>

#include <asm/smp.h>



static struct fwnode_handle *(*__get_intc_node)(void);



void riscv_set_intc_hwnode_fn(struct fwnode_handle *(*fn)(void))

{

	__get_intc_node = fn;

}



struct fwnode_handle *riscv_get_intc_hwnode(void)

{

	if (__get_intc_node)

		return __get_intc_node();



	return NULL;

}

EXPORT_SYMBOL_GPL(riscv_get_intc_hwnode);



int arch_show_interrupts(struct seq_file *p, int prec)

{

	show_ipi_stats(p, prec);

drivers/irqchip/irq-riscv-intc.c

+7 −0
Original line number Diff line number Diff line
@@ -92,6 +92,11 @@ static const struct irq_domain_ops riscv_intc_domain_ops = { 
	.xlate	= irq_domain_xlate_onecell,

};



static struct fwnode_handle *riscv_intc_hwnode(void)

{

	return intc_domain->fwnode;

}



static int __init riscv_intc_init(struct device_node *node,

				  struct device_node *parent)

{
@@ -126,6 +131,8 @@ static int __init riscv_intc_init(struct device_node *node, 
		return rc;

	}



	riscv_set_intc_hwnode_fn(riscv_intc_hwnode);



	cpuhp_setup_state(CPUHP_AP_IRQ_RISCV_STARTING,

			  "irqchip/riscv/intc:starting",

			  riscv_intc_cpu_starting,