Andrew Baumann | e3ece3e | 2016-01-29 14:50:39 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Raspberry Pi emulation (c) 2012 Gregory Estrade |
| 3 | * Refactoring for Pi2 Copyright (c) 2015, Microsoft. Written by Andrew Baumann. |
| 4 | * This code is licensed under the GNU GPLv2 and later. |
| 5 | * Heavily based on pl190.c, copyright terms below: |
| 6 | * |
| 7 | * Arm PrimeCell PL190 Vector Interrupt Controller |
| 8 | * |
| 9 | * Copyright (c) 2006 CodeSourcery. |
| 10 | * Written by Paul Brook |
| 11 | * |
| 12 | * This code is licensed under the GPL. |
| 13 | */ |
| 14 | |
Peter Maydell | c964b66 | 2016-02-08 19:01:23 +0000 | [diff] [blame] | 15 | #include "qemu/osdep.h" |
Andrew Baumann | e3ece3e | 2016-01-29 14:50:39 -0800 | [diff] [blame] | 16 | #include "hw/intc/bcm2835_ic.h" |
Paolo Bonzini | 03dd024 | 2015-12-15 13:16:16 +0100 | [diff] [blame] | 17 | #include "qemu/log.h" |
Andrew Baumann | e3ece3e | 2016-01-29 14:50:39 -0800 | [diff] [blame] | 18 | |
| 19 | #define GPU_IRQS 64 |
| 20 | #define ARM_IRQS 8 |
| 21 | |
| 22 | #define IRQ_PENDING_BASIC 0x00 /* IRQ basic pending */ |
| 23 | #define IRQ_PENDING_1 0x04 /* IRQ pending 1 */ |
| 24 | #define IRQ_PENDING_2 0x08 /* IRQ pending 2 */ |
| 25 | #define FIQ_CONTROL 0x0C /* FIQ register */ |
| 26 | #define IRQ_ENABLE_1 0x10 /* Interrupt enable register 1 */ |
| 27 | #define IRQ_ENABLE_2 0x14 /* Interrupt enable register 2 */ |
| 28 | #define IRQ_ENABLE_BASIC 0x18 /* Base interrupt enable register */ |
| 29 | #define IRQ_DISABLE_1 0x1C /* Interrupt disable register 1 */ |
| 30 | #define IRQ_DISABLE_2 0x20 /* Interrupt disable register 2 */ |
| 31 | #define IRQ_DISABLE_BASIC 0x24 /* Base interrupt disable register */ |
| 32 | |
| 33 | /* Update interrupts. */ |
| 34 | static void bcm2835_ic_update(BCM2835ICState *s) |
| 35 | { |
| 36 | bool set = false; |
| 37 | |
| 38 | if (s->fiq_enable) { |
| 39 | if (s->fiq_select >= GPU_IRQS) { |
| 40 | /* ARM IRQ */ |
| 41 | set = extract32(s->arm_irq_level, s->fiq_select - GPU_IRQS, 1); |
| 42 | } else { |
| 43 | set = extract64(s->gpu_irq_level, s->fiq_select, 1); |
| 44 | } |
| 45 | } |
| 46 | qemu_set_irq(s->fiq, set); |
| 47 | |
| 48 | set = (s->gpu_irq_level & s->gpu_irq_enable) |
| 49 | || (s->arm_irq_level & s->arm_irq_enable); |
| 50 | qemu_set_irq(s->irq, set); |
| 51 | |
| 52 | } |
| 53 | |
| 54 | static void bcm2835_ic_set_gpu_irq(void *opaque, int irq, int level) |
| 55 | { |
| 56 | BCM2835ICState *s = opaque; |
| 57 | |
| 58 | assert(irq >= 0 && irq < 64); |
| 59 | s->gpu_irq_level = deposit64(s->gpu_irq_level, irq, 1, level != 0); |
| 60 | bcm2835_ic_update(s); |
| 61 | } |
| 62 | |
| 63 | static void bcm2835_ic_set_arm_irq(void *opaque, int irq, int level) |
| 64 | { |
| 65 | BCM2835ICState *s = opaque; |
| 66 | |
| 67 | assert(irq >= 0 && irq < 8); |
| 68 | s->arm_irq_level = deposit32(s->arm_irq_level, irq, 1, level != 0); |
| 69 | bcm2835_ic_update(s); |
| 70 | } |
| 71 | |
| 72 | static const int irq_dups[] = { 7, 9, 10, 18, 19, 53, 54, 55, 56, 57, 62 }; |
| 73 | |
| 74 | static uint64_t bcm2835_ic_read(void *opaque, hwaddr offset, unsigned size) |
| 75 | { |
| 76 | BCM2835ICState *s = opaque; |
| 77 | uint32_t res = 0; |
| 78 | uint64_t gpu_pending = s->gpu_irq_level & s->gpu_irq_enable; |
| 79 | int i; |
| 80 | |
| 81 | switch (offset) { |
| 82 | case IRQ_PENDING_BASIC: |
| 83 | /* bits 0-7: ARM irqs */ |
| 84 | res = s->arm_irq_level & s->arm_irq_enable; |
| 85 | |
| 86 | /* bits 8 & 9: pending registers 1 & 2 */ |
| 87 | res |= (((uint32_t)gpu_pending) != 0) << 8; |
| 88 | res |= ((gpu_pending >> 32) != 0) << 9; |
| 89 | |
| 90 | /* bits 10-20: selected GPU IRQs */ |
| 91 | for (i = 0; i < ARRAY_SIZE(irq_dups); i++) { |
| 92 | res |= extract64(gpu_pending, irq_dups[i], 1) << (i + 10); |
| 93 | } |
| 94 | break; |
| 95 | case IRQ_PENDING_1: |
| 96 | res = gpu_pending; |
| 97 | break; |
| 98 | case IRQ_PENDING_2: |
| 99 | res = gpu_pending >> 32; |
| 100 | break; |
| 101 | case FIQ_CONTROL: |
| 102 | res = (s->fiq_enable << 7) | s->fiq_select; |
| 103 | break; |
| 104 | case IRQ_ENABLE_1: |
| 105 | res = s->gpu_irq_enable; |
| 106 | break; |
| 107 | case IRQ_ENABLE_2: |
| 108 | res = s->gpu_irq_enable >> 32; |
| 109 | break; |
| 110 | case IRQ_ENABLE_BASIC: |
| 111 | res = s->arm_irq_enable; |
| 112 | break; |
| 113 | case IRQ_DISABLE_1: |
| 114 | res = ~s->gpu_irq_enable; |
| 115 | break; |
| 116 | case IRQ_DISABLE_2: |
| 117 | res = ~s->gpu_irq_enable >> 32; |
| 118 | break; |
| 119 | case IRQ_DISABLE_BASIC: |
| 120 | res = ~s->arm_irq_enable; |
| 121 | break; |
| 122 | default: |
| 123 | qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n", |
| 124 | __func__, offset); |
| 125 | return 0; |
| 126 | } |
| 127 | |
| 128 | return res; |
| 129 | } |
| 130 | |
| 131 | static void bcm2835_ic_write(void *opaque, hwaddr offset, uint64_t val, |
| 132 | unsigned size) |
| 133 | { |
| 134 | BCM2835ICState *s = opaque; |
| 135 | |
| 136 | switch (offset) { |
| 137 | case FIQ_CONTROL: |
| 138 | s->fiq_select = extract32(val, 0, 7); |
| 139 | s->fiq_enable = extract32(val, 7, 1); |
| 140 | break; |
| 141 | case IRQ_ENABLE_1: |
| 142 | s->gpu_irq_enable |= val; |
| 143 | break; |
| 144 | case IRQ_ENABLE_2: |
| 145 | s->gpu_irq_enable |= val << 32; |
| 146 | break; |
| 147 | case IRQ_ENABLE_BASIC: |
| 148 | s->arm_irq_enable |= val & 0xff; |
| 149 | break; |
| 150 | case IRQ_DISABLE_1: |
| 151 | s->gpu_irq_enable &= ~val; |
| 152 | break; |
| 153 | case IRQ_DISABLE_2: |
| 154 | s->gpu_irq_enable &= ~(val << 32); |
| 155 | break; |
| 156 | case IRQ_DISABLE_BASIC: |
| 157 | s->arm_irq_enable &= ~val & 0xff; |
| 158 | break; |
| 159 | default: |
| 160 | qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n", |
| 161 | __func__, offset); |
| 162 | return; |
| 163 | } |
| 164 | bcm2835_ic_update(s); |
| 165 | } |
| 166 | |
| 167 | static const MemoryRegionOps bcm2835_ic_ops = { |
| 168 | .read = bcm2835_ic_read, |
| 169 | .write = bcm2835_ic_write, |
| 170 | .endianness = DEVICE_NATIVE_ENDIAN, |
| 171 | .valid.min_access_size = 4, |
| 172 | .valid.max_access_size = 4, |
| 173 | }; |
| 174 | |
| 175 | static void bcm2835_ic_reset(DeviceState *d) |
| 176 | { |
| 177 | BCM2835ICState *s = BCM2835_IC(d); |
| 178 | |
| 179 | s->gpu_irq_enable = 0; |
| 180 | s->arm_irq_enable = 0; |
| 181 | s->fiq_enable = false; |
| 182 | s->fiq_select = 0; |
| 183 | } |
| 184 | |
| 185 | static void bcm2835_ic_init(Object *obj) |
| 186 | { |
| 187 | BCM2835ICState *s = BCM2835_IC(obj); |
| 188 | |
| 189 | memory_region_init_io(&s->iomem, obj, &bcm2835_ic_ops, s, TYPE_BCM2835_IC, |
| 190 | 0x200); |
| 191 | sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem); |
| 192 | |
| 193 | qdev_init_gpio_in_named(DEVICE(s), bcm2835_ic_set_gpu_irq, |
| 194 | BCM2835_IC_GPU_IRQ, GPU_IRQS); |
| 195 | qdev_init_gpio_in_named(DEVICE(s), bcm2835_ic_set_arm_irq, |
| 196 | BCM2835_IC_ARM_IRQ, ARM_IRQS); |
| 197 | |
| 198 | sysbus_init_irq(SYS_BUS_DEVICE(s), &s->irq); |
| 199 | sysbus_init_irq(SYS_BUS_DEVICE(s), &s->fiq); |
| 200 | } |
| 201 | |
| 202 | static const VMStateDescription vmstate_bcm2835_ic = { |
| 203 | .name = TYPE_BCM2835_IC, |
| 204 | .version_id = 1, |
| 205 | .minimum_version_id = 1, |
| 206 | .fields = (VMStateField[]) { |
| 207 | VMSTATE_UINT64(gpu_irq_level, BCM2835ICState), |
| 208 | VMSTATE_UINT64(gpu_irq_enable, BCM2835ICState), |
| 209 | VMSTATE_UINT8(arm_irq_level, BCM2835ICState), |
| 210 | VMSTATE_UINT8(arm_irq_enable, BCM2835ICState), |
| 211 | VMSTATE_BOOL(fiq_enable, BCM2835ICState), |
| 212 | VMSTATE_UINT8(fiq_select, BCM2835ICState), |
| 213 | VMSTATE_END_OF_LIST() |
| 214 | } |
| 215 | }; |
| 216 | |
| 217 | static void bcm2835_ic_class_init(ObjectClass *klass, void *data) |
| 218 | { |
| 219 | DeviceClass *dc = DEVICE_CLASS(klass); |
| 220 | |
| 221 | dc->reset = bcm2835_ic_reset; |
| 222 | dc->vmsd = &vmstate_bcm2835_ic; |
| 223 | } |
| 224 | |
| 225 | static TypeInfo bcm2835_ic_info = { |
| 226 | .name = TYPE_BCM2835_IC, |
| 227 | .parent = TYPE_SYS_BUS_DEVICE, |
| 228 | .instance_size = sizeof(BCM2835ICState), |
| 229 | .class_init = bcm2835_ic_class_init, |
| 230 | .instance_init = bcm2835_ic_init, |
| 231 | }; |
| 232 | |
| 233 | static void bcm2835_ic_register_types(void) |
| 234 | { |
| 235 | type_register_static(&bcm2835_ic_info); |
| 236 | } |
| 237 | |
| 238 | type_init(bcm2835_ic_register_types) |