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

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
...@@ -12,6 +12,10 @@ ...@@ -12,6 +12,10 @@
#include <asm-generic/irq.h> #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); extern void __init init_IRQ(void);
#endif /* _ASM_RISCV_IRQ_H */ #endif /* _ASM_RISCV_IRQ_H */
...@@ -7,9 +7,27 @@ ...@@ -7,9 +7,27 @@
#include <linux/interrupt.h> #include <linux/interrupt.h>
#include <linux/irqchip.h> #include <linux/irqchip.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/seq_file.h> #include <linux/seq_file.h>
#include <asm/smp.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) int arch_show_interrupts(struct seq_file *p, int prec)
{ {
show_ipi_stats(p, prec); show_ipi_stats(p, prec);
......
...@@ -92,6 +92,11 @@ static const struct irq_domain_ops riscv_intc_domain_ops = { ...@@ -92,6 +92,11 @@ static const struct irq_domain_ops riscv_intc_domain_ops = {
.xlate = irq_domain_xlate_onecell, .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, static int __init riscv_intc_init(struct device_node *node,
struct device_node *parent) struct device_node *parent)
{ {
...@@ -126,6 +131,8 @@ static int __init riscv_intc_init(struct device_node *node, ...@@ -126,6 +131,8 @@ static int __init riscv_intc_init(struct device_node *node,
return rc; return rc;
} }
riscv_set_intc_hwnode_fn(riscv_intc_hwnode);
cpuhp_setup_state(CPUHP_AP_IRQ_RISCV_STARTING, cpuhp_setup_state(CPUHP_AP_IRQ_RISCV_STARTING,
"irqchip/riscv/intc:starting", "irqchip/riscv/intc:starting",
riscv_intc_cpu_starting, riscv_intc_cpu_starting,
......
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