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irqchip/riscv-intc: Add ACPI support 

Add support for initializing the RISC-V INTC driver on ACPI
platforms.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230515054928.2079268-17-sunilvl@ventanamicro.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Sunil V L 2023-05-15 11:19:23 +05:30 committed by Palmer Dabbelt
parent 0b144c8189
commit 7023b9d83f
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
1 changed files with 58 additions and 18 deletions
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76
drivers/irqchip/irq-riscv-intc.c
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@ -6,6 +6,7 @@
*/
#define pr_fmt(fmt) "riscv-intc: " fmt
#include <linux/acpi.h>
#include <linux/atomic.h>
#include <linux/bits.h>
#include <linux/cpu.h>
@ -112,6 +113,30 @@ static struct fwnode_handle *riscv_intc_hwnode(void)
return intc_domain->fwnode;
}
static int __init riscv_intc_init_common(struct fwnode_handle *fn)
{
int rc;
intc_domain = irq_domain_create_linear(fn, BITS_PER_LONG,
&riscv_intc_domain_ops, NULL);
if (!intc_domain) {
pr_err("unable to add IRQ domain\n");
return -ENXIO;
}
rc = set_handle_irq(&riscv_intc_irq);
if (rc) {
pr_err("failed to set irq handler\n");
return rc;
}
riscv_set_intc_hwnode_fn(riscv_intc_hwnode);
pr_info("%d local interrupts mapped\n", BITS_PER_LONG);
return 0;
}
static int __init riscv_intc_init(struct device_node *node,
struct device_node *parent)
{
@ -133,24 +158,39 @@ static int __init riscv_intc_init(struct device_node *node,
if (riscv_hartid_to_cpuid(hartid) != smp_processor_id())
return 0;
intc_domain = irq_domain_add_linear(node, BITS_PER_LONG,
&riscv_intc_domain_ops, NULL);
if (!intc_domain) {
pr_err("unable to add IRQ domain\n");
return -ENXIO;
}
rc = set_handle_irq(&riscv_intc_irq);
if (rc) {
pr_err("failed to set irq handler\n");
return rc;
}
riscv_set_intc_hwnode_fn(riscv_intc_hwnode);
pr_info("%d local interrupts mapped\n", BITS_PER_LONG);
return 0;
return riscv_intc_init_common(of_node_to_fwnode(node));
}
IRQCHIP_DECLARE(riscv, "riscv,cpu-intc", riscv_intc_init);
#ifdef CONFIG_ACPI
static int __init riscv_intc_acpi_init(union acpi_subtable_headers *header,
const unsigned long end)
{
struct fwnode_handle *fn;
struct acpi_madt_rintc *rintc;
rintc = (struct acpi_madt_rintc *)header;
/*
* The ACPI MADT will have one INTC for each CPU (or HART)
* so riscv_intc_acpi_init() function will be called once
* for each INTC. We only do INTC initialization
* for the INTC belonging to the boot CPU (or boot HART).
*/
if (riscv_hartid_to_cpuid(rintc->hart_id) != smp_processor_id())
return 0;
fn = irq_domain_alloc_named_fwnode("RISCV-INTC");
if (!fn) {
pr_err("unable to allocate INTC FW node\n");
return -ENOMEM;
}
return riscv_intc_init_common(fn);
}
IRQCHIP_ACPI_DECLARE(riscv_intc, ACPI_MADT_TYPE_RINTC, NULL,
ACPI_MADT_RINTC_VERSION_V1, riscv_intc_acpi_init);
#endif