1/* 2 * Copyright 2019, Data61 3 * Commonwealth Scientific and Industrial Research Organisation (CSIRO) 4 * ABN 41 687 119 230. 5 * 6 * This software may be distributed and modified according to the terms of 7 * the BSD 2-Clause license. Note that NO WARRANTY is provided. 8 * See "LICENSE_BSD2.txt" for details. 9 * 10 * @TAG(DATA61_BSD) 11 */ 12 13#include <assert.h> 14#include <stdbool.h> 15 16#include <utils/util.h> 17 18#include "../../../irqchip.h" 19 20#define ARM_GIC_INT_CELL_COUNT 3 21 22#define SPI_IRQ_TYPE 0 23#define PPI_IRQ_TYPE 1 24 25/* These offsets are in the context of the normal 'interrupts' property, 26 * for the 'interrupts-extended' property, we add one to each */ 27typedef enum { 28 INT_TYPE_OFFSET, 29 INT_OFFSET 30} interrupt_cell_offset; 31 32typedef enum { 33 EXT_INT_CONTROLLER_OFFSET, 34 EXT_INT_TYPE_OFFSET, 35 EXT_INT_OFFSET 36} ext_interrupt_cell_offset; 37 38/* Note for extended interrupts, we expect the common case that the interrupt controller phandles 39 * for each block in the property is the same as the GICs phandle */ 40static int parse_arm_gic_interrupts(char *dtb_blob, int node_offset, int intr_controller_phandle, 41 irq_walk_cb_fn_t callback, void *token) 42{ 43 bool is_extended = false; 44 int prop_len = 0; 45 const void *interrupts_prop = get_interrupts_prop(dtb_blob, node_offset, &is_extended, &prop_len); 46 assert(interrupts_prop != NULL); 47 int total_cells = prop_len / sizeof(uint32_t); 48 49 int stride = ARM_GIC_INT_CELL_COUNT + (is_extended == true); 50 int num_interrupts = total_cells / stride; 51 52 assert(total_cells % stride == 0); 53 54 for (int i = 0; i < num_interrupts; i++) { 55 ps_irq_t curr_irq = {0}; 56 const void *curr = interrupts_prop + (i * stride * sizeof(uint32_t)); 57 curr_irq.type = PS_INTERRUPT; 58 uint32_t irq_type = 0; 59 uint32_t irq = 0; 60 if (is_extended) { 61 if (READ_CELL(1, curr, EXT_INT_CONTROLLER_OFFSET) != intr_controller_phandle) { 62 /* Bail, we hit the uncommon case where this device has interrupts routed to 63 * different interrupt controllers */ 64 return -EINVAL; 65 } 66 irq_type = READ_CELL(1, curr, EXT_INT_TYPE_OFFSET); 67 irq = READ_CELL(1, curr, EXT_INT_OFFSET); 68 } else { 69 irq_type = READ_CELL(1, curr, INT_TYPE_OFFSET); 70 irq = READ_CELL(1, curr, INT_OFFSET); 71 } 72 curr_irq.irq.number = irq + (irq_type == SPI_IRQ_TYPE ? 32 : 0); 73 int error = callback(curr_irq, i, num_interrupts, token); 74 if (error) { 75 return error; 76 } 77 } 78 79 return 0; 80} 81 82char *arm_gic_compatible_list[] = { 83 "arm,gic-400", 84 "arm,cortex-a9-gic", 85 "arm,cortex-a15-gic", 86 NULL 87}; 88DEFINE_IRQCHIP_PARSER(arm_gic, arm_gic_compatible_list, parse_arm_gic_interrupts); 89