1 /* 2 * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 #include <assert.h> 7 #include <gic_common.h> 8 #include <gicv2.h> 9 #include <interrupt_mgmt.h> 10 11 /* 12 * The following platform GIC functions are weakly defined. They 13 * provide typical implementations that may be re-used by multiple 14 * platforms but may also be overridden by a platform if required. 15 */ 16 #pragma weak plat_ic_get_pending_interrupt_id 17 #pragma weak plat_ic_get_pending_interrupt_type 18 #pragma weak plat_ic_acknowledge_interrupt 19 #pragma weak plat_ic_get_interrupt_type 20 #pragma weak plat_ic_end_of_interrupt 21 #pragma weak plat_interrupt_type_to_line 22 23 #pragma weak plat_ic_get_running_priority 24 25 /* 26 * This function returns the highest priority pending interrupt at 27 * the Interrupt controller 28 */ 29 uint32_t plat_ic_get_pending_interrupt_id(void) 30 { 31 unsigned int id; 32 33 id = gicv2_get_pending_interrupt_id(); 34 if (id == GIC_SPURIOUS_INTERRUPT) 35 return INTR_ID_UNAVAILABLE; 36 37 return id; 38 } 39 40 /* 41 * This function returns the type of the highest priority pending interrupt 42 * at the Interrupt controller. In the case of GICv2, the Highest Priority 43 * Pending interrupt register (`GICC_HPPIR`) is read to determine the id of 44 * the pending interrupt. The type of interrupt depends upon the id value 45 * as follows. 46 * 1. id < PENDING_G1_INTID (1022) is reported as a S-EL1 interrupt 47 * 2. id = PENDING_G1_INTID (1022) is reported as a Non-secure interrupt. 48 * 3. id = GIC_SPURIOUS_INTERRUPT (1023) is reported as an invalid interrupt 49 * type. 50 */ 51 uint32_t plat_ic_get_pending_interrupt_type(void) 52 { 53 unsigned int id; 54 55 id = gicv2_get_pending_interrupt_type(); 56 57 /* Assume that all secure interrupts are S-EL1 interrupts */ 58 if (id < PENDING_G1_INTID) 59 return INTR_TYPE_S_EL1; 60 61 if (id == GIC_SPURIOUS_INTERRUPT) 62 return INTR_TYPE_INVAL; 63 64 return INTR_TYPE_NS; 65 } 66 67 /* 68 * This function returns the highest priority pending interrupt at 69 * the Interrupt controller and indicates to the Interrupt controller 70 * that the interrupt processing has started. 71 */ 72 uint32_t plat_ic_acknowledge_interrupt(void) 73 { 74 return gicv2_acknowledge_interrupt(); 75 } 76 77 /* 78 * This function returns the type of the interrupt `id`, depending on how 79 * the interrupt has been configured in the interrupt controller 80 */ 81 uint32_t plat_ic_get_interrupt_type(uint32_t id) 82 { 83 unsigned int type; 84 85 type = gicv2_get_interrupt_group(id); 86 87 /* Assume that all secure interrupts are S-EL1 interrupts */ 88 return (type) ? INTR_TYPE_NS : INTR_TYPE_S_EL1; 89 } 90 91 /* 92 * This functions is used to indicate to the interrupt controller that 93 * the processing of the interrupt corresponding to the `id` has 94 * finished. 95 */ 96 void plat_ic_end_of_interrupt(uint32_t id) 97 { 98 gicv2_end_of_interrupt(id); 99 } 100 101 /* 102 * An ARM processor signals interrupt exceptions through the IRQ and FIQ pins. 103 * The interrupt controller knows which pin/line it uses to signal a type of 104 * interrupt. It lets the interrupt management framework determine 105 * for a type of interrupt and security state, which line should be used in the 106 * SCR_EL3 to control its routing to EL3. The interrupt line is represented 107 * as the bit position of the IRQ or FIQ bit in the SCR_EL3. 108 */ 109 uint32_t plat_interrupt_type_to_line(uint32_t type, 110 uint32_t security_state) 111 { 112 assert(type == INTR_TYPE_S_EL1 || 113 type == INTR_TYPE_EL3 || 114 type == INTR_TYPE_NS); 115 116 /* Non-secure interrupts are signaled on the IRQ line always */ 117 if (type == INTR_TYPE_NS) 118 return __builtin_ctz(SCR_IRQ_BIT); 119 120 /* 121 * Secure interrupts are signaled using the IRQ line if the FIQ is 122 * not enabled else they are signaled using the FIQ line. 123 */ 124 return ((gicv2_is_fiq_enabled()) ? __builtin_ctz(SCR_FIQ_BIT) : 125 __builtin_ctz(SCR_IRQ_BIT)); 126 } 127 128 unsigned int plat_ic_get_running_priority(void) 129 { 130 return gicv2_get_running_priority(); 131 } 132