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path: root/drivers/irqchip/irq-gic.c
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Diffstat (limited to 'drivers/irqchip/irq-gic.c')
-rw-r--r--drivers/irqchip/irq-gic.c69
1 files changed, 35 insertions, 34 deletions
diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 982c09c2d791..d4add30d1d46 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -41,7 +41,6 @@
#include <linux/irqchip.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqchip/arm-gic.h>
-#include <linux/irqchip/arm-gic-acpi.h>
#include <asm/cputype.h>
#include <asm/irq.h>
@@ -1195,7 +1194,7 @@ IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init);
#endif
#ifdef CONFIG_ACPI
-static phys_addr_t dist_phy_base, cpu_phy_base __initdata;
+static phys_addr_t cpu_phy_base __initdata;
static int __init
gic_acpi_parse_madt_cpu(struct acpi_subtable_header *header,
@@ -1223,60 +1222,56 @@ gic_acpi_parse_madt_cpu(struct acpi_subtable_header *header,
return 0;
}
-static int __init
-gic_acpi_parse_madt_distributor(struct acpi_subtable_header *header,
- const unsigned long end)
+/* The things you have to do to just *count* something... */
+static int __init acpi_dummy_func(struct acpi_subtable_header *header,
+ const unsigned long end)
{
- struct acpi_madt_generic_distributor *dist;
+ return 0;
+}
- dist = (struct acpi_madt_generic_distributor *)header;
+static bool __init acpi_gic_redist_is_present(void)
+{
+ return acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
+ acpi_dummy_func, 0) > 0;
+}
- if (BAD_MADT_ENTRY(dist, end))
- return -EINVAL;
+static bool __init gic_validate_dist(struct acpi_subtable_header *header,
+ struct acpi_probe_entry *ape)
+{
+ struct acpi_madt_generic_distributor *dist;
+ dist = (struct acpi_madt_generic_distributor *)header;
- dist_phy_base = dist->base_address;
- return 0;
+ return (dist->version == ape->driver_data &&
+ (dist->version != ACPI_MADT_GIC_VERSION_NONE ||
+ !acpi_gic_redist_is_present()));
}
-int __init
-gic_v2_acpi_init(struct acpi_table_header *table)
+#define ACPI_GICV2_DIST_MEM_SIZE (SZ_4K)
+#define ACPI_GIC_CPU_IF_MEM_SIZE (SZ_8K)
+
+static int __init gic_v2_acpi_init(struct acpi_subtable_header *header,
+ const unsigned long end)
{
+ struct acpi_madt_generic_distributor *dist;
void __iomem *cpu_base, *dist_base;
int count;
/* Collect CPU base addresses */
- count = acpi_parse_entries(ACPI_SIG_MADT,
- sizeof(struct acpi_table_madt),
- gic_acpi_parse_madt_cpu, table,
- ACPI_MADT_TYPE_GENERIC_INTERRUPT, 0);
+ count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
+ gic_acpi_parse_madt_cpu, 0);
if (count <= 0) {
pr_err("No valid GICC entries exist\n");
return -EINVAL;
}
- /*
- * Find distributor base address. We expect one distributor entry since
- * ACPI 5.1 spec neither support multi-GIC instances nor GIC cascade.
- */
- count = acpi_parse_entries(ACPI_SIG_MADT,
- sizeof(struct acpi_table_madt),
- gic_acpi_parse_madt_distributor, table,
- ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR, 0);
- if (count <= 0) {
- pr_err("No valid GICD entries exist\n");
- return -EINVAL;
- } else if (count > 1) {
- pr_err("More than one GICD entry detected\n");
- return -EINVAL;
- }
-
cpu_base = ioremap(cpu_phy_base, ACPI_GIC_CPU_IF_MEM_SIZE);
if (!cpu_base) {
pr_err("Unable to map GICC registers\n");
return -ENOMEM;
}
- dist_base = ioremap(dist_phy_base, ACPI_GICV2_DIST_MEM_SIZE);
+ dist = (struct acpi_madt_generic_distributor *)header;
+ dist_base = ioremap(dist->base_address, ACPI_GICV2_DIST_MEM_SIZE);
if (!dist_base) {
pr_err("Unable to map GICD registers\n");
iounmap(cpu_base);
@@ -1302,4 +1297,10 @@ gic_v2_acpi_init(struct acpi_table_header *table)
acpi_irq_model = ACPI_IRQ_MODEL_GIC;
return 0;
}
+IRQCHIP_ACPI_DECLARE(gic_v2, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
+ gic_validate_dist, ACPI_MADT_GIC_VERSION_V2,
+ gic_v2_acpi_init);
+IRQCHIP_ACPI_DECLARE(gic_v2_maybe, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
+ gic_validate_dist, ACPI_MADT_GIC_VERSION_NONE,
+ gic_v2_acpi_init);
#endif
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