// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2023-2024, Ventana Micro Systems Inc
* Author: Sunil V L <[email protected]>
*/
#include <linux/acpi.h>
#include <linux/sort.h>
#include <linux/irq.h>
#include "init.h"
struct riscv_ext_intc_list {
acpi_handle handle;
u32 gsi_base;
u32 nr_irqs;
u32 nr_idcs;
u32 id;
u32 type;
struct list_head list;
};
struct acpi_irq_dep_ctx {
int rc;
unsigned int index;
acpi_handle handle;
};
LIST_HEAD(ext_intc_list);
static int irqchip_cmp_func(const void *in0, const void *in1)
{
struct acpi_probe_entry *elem0 = (struct acpi_probe_entry *)in0;
struct acpi_probe_entry *elem1 = (struct acpi_probe_entry *)in1;
return (elem0->type > elem1->type) - (elem0->type < elem1->type);
}
/*
* On RISC-V, RINTC structures in MADT should be probed before any other
* interrupt controller structures and IMSIC before APLIC. The interrupt
* controller subtypes in MADT of ACPI spec for RISC-V are defined in
* the incremental order like RINTC(24)->IMSIC(25)->APLIC(26)->PLIC(27).
* Hence, simply sorting the subtypes in incremental order will
* establish the required order.
*/
void arch_sort_irqchip_probe(struct acpi_probe_entry *ap_head, int nr)
{
struct acpi_probe_entry *ape = ap_head;
if (nr == 1 || !ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id))
return;
sort(ape, nr, sizeof(*ape), irqchip_cmp_func, NULL);
}
static acpi_status riscv_acpi_update_gsi_handle(u32 gsi_base, acpi_handle handle)
{
struct riscv_ext_intc_list *ext_intc_element;
struct list_head *i, *tmp;
list_for_each_safe(i, tmp, &ext_intc_list) {
ext_intc_element = list_entry(i, struct riscv_ext_intc_list, list);
if (gsi_base == ext_intc_element->gsi_base) {
ext_intc_element->handle = handle;
return AE_OK;
}
}
return AE_NOT_FOUND;
}
int riscv_acpi_get_gsi_info(struct fwnode_handle *fwnode, u32 *gsi_base,
u32 *id, u32 *nr_irqs, u32 *nr_idcs)
{
struct riscv_ext_intc_list *ext_intc_element;
struct list_head *i;
list_for_each(i, &ext_intc_list) {
ext_intc_element = list_entry(i, struct riscv_ext_intc_list, list);
if (ext_intc_element->handle == ACPI_HANDLE_FWNODE(fwnode)) {
*gsi_base = ext_intc_element->gsi_base;
*id = ext_intc_element->id;
*nr_irqs = ext_intc_element->nr_irqs;
if (nr_idcs)
*nr_idcs = ext_intc_element->nr_idcs;
return 0;
}
}
return -ENODEV;
}
struct fwnode_handle *riscv_acpi_get_gsi_domain_id(u32 gsi)
{
struct riscv_ext_intc_list *ext_intc_element;
struct acpi_device *adev;
struct list_head *i;
list_for_each(i, &ext_intc_list) {
ext_intc_element = list_entry(i, struct riscv_ext_intc_list, list);
if (gsi >= ext_intc_element->gsi_base &&
gsi < (ext_intc_element->gsi_base + ext_intc_element->nr_irqs)) {
adev = acpi_fetch_acpi_dev(ext_intc_element->handle);
if (!adev)
return NULL;
return acpi_fwnode_handle(adev);
}
}
return NULL;
}
static int __init riscv_acpi_register_ext_intc(u32 gsi_base, u32 nr_irqs, u32 nr_idcs,
u32 id, u32 type)
{
struct riscv_ext_intc_list *ext_intc_element;
ext_intc_element = kzalloc(sizeof(*ext_intc_element), GFP_KERNEL);
if (!ext_intc_element)
return -ENOMEM;
ext_intc_element->gsi_base = gsi_base;
ext_intc_element->nr_irqs = nr_irqs;
ext_intc_element->nr_idcs = nr_idcs;
ext_intc_element->id = id;
list_add_tail(&ext_intc_element->list, &ext_intc_list);
return 0;
}
static acpi_status __init riscv_acpi_create_gsi_map(acpi_handle handle, u32 level,
void *context, void **return_value)
{
acpi_status status;
u64 gbase;
if (!acpi_has_method(handle, "_GSB")) {
acpi_handle_err(handle, "_GSB method not found\n");
return AE_ERROR;
}
status = acpi_evaluate_integer(handle, "_GSB", NULL, &gbase);
if (ACPI_FAILURE(status)) {
acpi_handle_err(handle, "failed to evaluate _GSB method\n");
return status;
}
status = riscv_acpi_update_gsi_handle((u32)gbase, handle);
if (ACPI_FAILURE(status)) {
acpi_handle_err(handle, "failed to find the GSI mapping entry\n");
return status;
}
return AE_OK;
}
static int __init riscv_acpi_aplic_parse_madt(union acpi_subtable_headers *header,
const unsigned long end)
{
struct acpi_madt_aplic *aplic = (struct acpi_madt_aplic *)header;
return riscv_acpi_register_ext_intc(aplic->gsi_base, aplic->num_sources, aplic->num_idcs,
aplic->id, ACPI_RISCV_IRQCHIP_APLIC);
}
static int __init riscv_acpi_plic_parse_madt(union acpi_subtable_headers *header,
const unsigned long end)
{
struct acpi_madt_plic *plic = (struct acpi_madt_plic *)header;
return riscv_acpi_register_ext_intc(plic->gsi_base, plic->num_irqs, 0,
plic->id, ACPI_RISCV_IRQCHIP_PLIC);
}
void __init riscv_acpi_init_gsi_mapping(void)
{
/* There can be either PLIC or APLIC */
if (acpi_table_parse_madt(ACPI_MADT_TYPE_PLIC, riscv_acpi_plic_parse_madt, 0) > 0) {
acpi_get_devices("RSCV0001", riscv_acpi_create_gsi_map, NULL, NULL);
return;
}
if (acpi_table_parse_madt(ACPI_MADT_TYPE_APLIC, riscv_acpi_aplic_parse_madt, 0) > 0)
acpi_get_devices("RSCV0002", riscv_acpi_create_gsi_map, NULL, NULL);
}
static acpi_handle riscv_acpi_get_gsi_handle(u32 gsi)
{
struct riscv_ext_intc_list *ext_intc_element;
struct list_head *i;
list_for_each(i, &ext_intc_list) {
ext_intc_element = list_entry(i, struct riscv_ext_intc_list, list);
if (gsi >= ext_intc_element->gsi_base &&
gsi < (ext_intc_element->gsi_base + ext_intc_element->nr_irqs))
return ext_intc_element->handle;
}
return NULL;
}
static acpi_status riscv_acpi_irq_get_parent(struct acpi_resource *ares, void *context)
{
struct acpi_irq_dep_ctx *ctx = context;
struct acpi_resource_irq *irq;
struct acpi_resource_extended_irq *eirq;
switch (ares->type) {
case ACPI_RESOURCE_TYPE_IRQ:
irq = &ares->data.irq;
if (ctx->index >= irq->interrupt_count) {
ctx->index -= irq->interrupt_count;
return AE_OK;
}
ctx->handle = riscv_acpi_get_gsi_handle(irq->interrupts[ctx->index]);
return AE_CTRL_TERMINATE;
case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
eirq = &ares->data.extended_irq;
if (eirq->producer_consumer == ACPI_PRODUCER)
return AE_OK;
if (ctx->index >= eirq->interrupt_count) {
ctx->index -= eirq->interrupt_count;
return AE_OK;
}
/* Support GSIs only */
if (eirq->resource_source.string_length)
return AE_OK;
ctx->handle = riscv_acpi_get_gsi_handle(eirq->interrupts[ctx->index]);
return AE_CTRL_TERMINATE;
}
return AE_OK;
}
static int riscv_acpi_irq_get_dep(acpi_handle handle, unsigned int index, acpi_handle *gsi_handle)
{
struct acpi_irq_dep_ctx ctx = {-EINVAL, index, NULL};
if (!gsi_handle)
return 0;
acpi_walk_resources(handle, METHOD_NAME__CRS, riscv_acpi_irq_get_parent, &ctx);
*gsi_handle = ctx.handle;
if (*gsi_handle)
return 1;
return 0;
}
static u32 riscv_acpi_add_prt_dep(acpi_handle handle)
{
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_pci_routing_table *entry;
struct acpi_handle_list dep_devices;
acpi_handle gsi_handle;
acpi_handle link_handle;
acpi_status status;
u32 count = 0;
status = acpi_get_irq_routing_table(handle, &buffer);
if (ACPI_FAILURE(status)) {
acpi_handle_err(handle, "failed to get IRQ routing table\n");
kfree(buffer.pointer);
return 0;
}
entry = buffer.pointer;
while (entry && (entry->length > 0)) {
if (entry->source[0]) {
acpi_get_handle(handle, entry->source, &link_handle);
dep_devices.count = 1;
dep_devices.handles = kcalloc(1, sizeof(*dep_devices.handles), GFP_KERNEL);
if (!dep_devices.handles) {
acpi_handle_err(handle, "failed to allocate memory\n");
continue;
}
dep_devices.handles[0] = link_handle;
count += acpi_scan_add_dep(handle, &dep_devices);
} else {
gsi_handle = riscv_acpi_get_gsi_handle(entry->source_index);
dep_devices.count = 1;
dep_devices.handles = kcalloc(1, sizeof(*dep_devices.handles), GFP_KERNEL);
if (!dep_devices.handles) {
acpi_handle_err(handle, "failed to allocate memory\n");
continue;
}
dep_devices.handles[0] = gsi_handle;
count += acpi_scan_add_dep(handle, &dep_devices);
}
entry = (struct acpi_pci_routing_table *)
((unsigned long)entry + entry->length);
}
kfree(buffer.pointer);
return count;
}
static u32 riscv_acpi_add_irq_dep(acpi_handle handle)
{
struct acpi_handle_list dep_devices;
acpi_handle gsi_handle;
u32 count = 0;
int i;
for (i = 0;
riscv_acpi_irq_get_dep(handle, i, &gsi_handle);
i++) {
dep_devices.count = 1;
dep_devices.handles = kcalloc(1, sizeof(*dep_devices.handles), GFP_KERNEL);
if (!dep_devices.handles) {
acpi_handle_err(handle, "failed to allocate memory\n");
continue;
}
dep_devices.handles[0] = gsi_handle;
count += acpi_scan_add_dep(handle, &dep_devices);
}
return count;
}
u32 arch_acpi_add_auto_dep(acpi_handle handle)
{
if (acpi_has_method(handle, "_PRT"))
return riscv_acpi_add_prt_dep(handle);
return riscv_acpi_add_irq_dep(handle);
}
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