src/acpi/acpi_gic.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <acpi/acpi.h>
   4 #include <device/device.h>
   5
   6 static int acpi_create_madt_one_gicc_v3(acpi_madt_gicc_t *gicc, u32 acpi_uid, u32 pi_gsiv,
   7                                         uint32_t vgic_mi, uint64_t mpidr)
   8 {
   9         memset(gicc, 0, sizeof(acpi_madt_gicc_t));
  10         gicc->type = GICC;
  11         gicc->length = sizeof(acpi_madt_gicc_t);
  12         gicc->reserved = 0;
  13         gicc->cpu_interface_number = 0; /* V3, no compat mode */
  14         gicc->acpi_processor_uid = acpi_uid;
  15         gicc->flags.enabled = 1;
  16         gicc->parking_protocol_version = 0; /* Assume PSCI exclusively */
  17         gicc->performance_interrupt_gsiv = pi_gsiv;
  18         gicc->parked_address = 0;
  19         gicc->physical_base_address = 0; /* V3, no compat mode */
  20         gicc->vgic_maintenance_interrupt = vgic_mi;
  21         gicc->gicr_base_address = 0; /* ignored by OSPM if GICR is present */
  22         gicc->processor_power_efficiency_class = 0; /* Ignore for now */
  23         /* For platforms implementing GIC V3 the format must be:
  24          * Bits [63:40] Must be zero
  25          * Bits [39:32] Aff3 : Match Aff3 of target processor MPIDR
  26          * Bits [31:24] Must be zero
  27          * Bits [23:16] Aff2 : Match Aff2 of target processor MPIDR
  28          * Bits [15:8] Aff1 : Match Aff1 of target processor MPIDR
  29          * Bits [7:0] Aff0 : Match Aff0 of target processor MPIDR
  30         */
  31         gicc->mpidr = mpidr & 0xff00fffffful;
  32
  33         return gicc->length;
  34 }
  35
  36 static unsigned long acpi_create_madt_giccs_v3(unsigned long current)
  37 {
  38         // Loop over CPUs GIC
  39         uint32_t acpi_id = 0;
  40         for (struct device *dev = dev_find_path(NULL, DEVICE_PATH_GICC_V3); dev;
  41              dev = dev_find_path(dev, DEVICE_PATH_GICC_V3)) {
  42                 acpi_madt_gicc_t *gicc = (acpi_madt_gicc_t *)current;
  43                 current += acpi_create_madt_one_gicc_v3(gicc, acpi_id++,
  44                                                         dev->path.gicc_v3.pi_gsiv,
  45                                                         dev->path.gicc_v3.vgic_mi,
  46                                                         dev->path.gicc_v3.mpidr);
  47         }
  48
  49         return current;
  50 }
  51
  52 static unsigned long acpi_create_madt_gicd_v3(unsigned long current)
  53 {
  54         acpi_madt_gicd_t *gicd = (acpi_madt_gicd_t *)current;
  55         memset(gicd, 0, sizeof(acpi_madt_gicd_t));
  56         gicd->type = GICD;
  57         gicd->length = sizeof(acpi_madt_gicd_t);
  58         gicd->physical_base_address = platform_get_gicd_base();
  59         gicd->system_vector_base = 0;
  60         gicd->gic_version = 3;
  61
  62         return current + gicd->length;
  63 }
  64
  65 /*
  66  * The redistributor in GICv3 has two 64KB frames per CPU; in
  67  * GICv4 it has four 64KB frames per CPU.
  68  */
  69 #define GICV3_REDIST_SIZE 0x20000
  70 #define GICV4_REDIST_SIZE 0x40000
  71 static unsigned long acpi_create_madt_gicr_v3(unsigned long current)
  72 {
  73         acpi_madt_gicr_t *gicr = (acpi_madt_gicr_t *)current;
  74         memset(gicr, 0, sizeof(acpi_madt_gicr_t));
  75         gicr->type = GICR;
  76         gicr->length = sizeof(acpi_madt_gicr_t);
  77         gicr->discovery_range_base_address = platform_get_gicr_base();
  78         gicr->discovery_range_length = GICV3_REDIST_SIZE * CONFIG_MAX_CPUS;
  79
  80         return current + gicr->length;
  81 }
  82
  83 __weak int platform_get_gic_its(uintptr_t **base)
  84 {
  85         return 0;
  86 }
  87
  88 static unsigned long acpi_create_madt_gic_its_v3(unsigned long current)
  89 {
  90         int i, its_count;
  91         uintptr_t *its_base;
  92
  93         its_count = platform_get_gic_its(&its_base);
  94
  95         for (i = 0; i < its_count; i++) {
  96                 acpi_madt_gic_its_t *gic_its = (acpi_madt_gic_its_t *)current;
  97                 memset(gic_its, 0, sizeof(acpi_madt_gic_its_t));
  98                 gic_its->type = GIC_ITS;
  99                 gic_its->gic_its_id = i;
 100                 gic_its->physical_base_address = its_base[i];
 101                 gic_its->length = sizeof(acpi_madt_gic_its_t);
 102
 103                 current = current + gic_its->length;
 104         }
 105         return current;
 106 }
 107
 108 unsigned long acpi_arch_fill_madt(acpi_madt_t *madt, unsigned long current)
 109 {
 110         current = acpi_create_madt_giccs_v3(current);
 111         current = acpi_create_madt_gicd_v3(current);
 112         current = acpi_create_madt_gicr_v3(current);
 113         current = acpi_create_madt_gic_its_v3(current);
 114
 115         return current;
 116 }