1 /* 2 * QEMU Xilinx OPB Interrupt Controller. 3 * 4 * Copyright (c) 2009 Edgar E. Iglesias. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 #include "hw/sysbus.h" 27 #include "qemu/module.h" 28 #include "hw/hw.h" 29 #include "hw/irq.h" 30 31 #define D(x) 32 33 #define R_ISR 0 34 #define R_IPR 1 35 #define R_IER 2 36 #define R_IAR 3 37 #define R_SIE 4 38 #define R_CIE 5 39 #define R_IVR 6 40 #define R_MER 7 41 #define R_MAX 8 42 43 #define TYPE_XILINX_INTC "xlnx.xps-intc" 44 #define XILINX_INTC(obj) OBJECT_CHECK(struct xlx_pic, (obj), TYPE_XILINX_INTC) 45 46 struct xlx_pic 47 { 48 SysBusDevice parent_obj; 49 50 MemoryRegion mmio; 51 qemu_irq parent_irq; 52 53 /* Configuration reg chosen at synthesis-time. QEMU populates 54 the bits at board-setup. */ 55 uint32_t c_kind_of_intr; 56 57 /* Runtime control registers. */ 58 uint32_t regs[R_MAX]; 59 /* state of the interrupt input pins */ 60 uint32_t irq_pin_state; 61 }; 62 63 static void update_irq(struct xlx_pic *p) 64 { 65 uint32_t i; 66 67 /* level triggered interrupt */ 68 if (p->regs[R_MER] & 2) { 69 p->regs[R_ISR] |= p->irq_pin_state & ~p->c_kind_of_intr; 70 } 71 72 /* Update the pending register. */ 73 p->regs[R_IPR] = p->regs[R_ISR] & p->regs[R_IER]; 74 75 /* Update the vector register. */ 76 for (i = 0; i < 32; i++) { 77 if (p->regs[R_IPR] & (1U << i)) { 78 break; 79 } 80 } 81 if (i == 32) 82 i = ~0; 83 84 p->regs[R_IVR] = i; 85 qemu_set_irq(p->parent_irq, (p->regs[R_MER] & 1) && p->regs[R_IPR]); 86 } 87 88 static uint64_t 89 pic_read(void *opaque, hwaddr addr, unsigned int size) 90 { 91 struct xlx_pic *p = opaque; 92 uint32_t r = 0; 93 94 addr >>= 2; 95 switch (addr) 96 { 97 default: 98 if (addr < ARRAY_SIZE(p->regs)) 99 r = p->regs[addr]; 100 break; 101 102 } 103 D(printf("%s %x=%x\n", __func__, addr * 4, r)); 104 return r; 105 } 106 107 static void 108 pic_write(void *opaque, hwaddr addr, 109 uint64_t val64, unsigned int size) 110 { 111 struct xlx_pic *p = opaque; 112 uint32_t value = val64; 113 114 addr >>= 2; 115 D(qemu_log("%s addr=%x val=%x\n", __func__, addr * 4, value)); 116 switch (addr) 117 { 118 case R_IAR: 119 p->regs[R_ISR] &= ~value; /* ACK. */ 120 break; 121 case R_SIE: 122 p->regs[R_IER] |= value; /* Atomic set ie. */ 123 break; 124 case R_CIE: 125 p->regs[R_IER] &= ~value; /* Atomic clear ie. */ 126 break; 127 case R_MER: 128 p->regs[R_MER] = value & 0x3; 129 break; 130 case R_ISR: 131 if ((p->regs[R_MER] & 2)) { 132 break; 133 } 134 /* fallthrough */ 135 default: 136 if (addr < ARRAY_SIZE(p->regs)) 137 p->regs[addr] = value; 138 break; 139 } 140 update_irq(p); 141 } 142 143 static const MemoryRegionOps pic_ops = { 144 .read = pic_read, 145 .write = pic_write, 146 .endianness = DEVICE_NATIVE_ENDIAN, 147 .valid = { 148 .min_access_size = 4, 149 .max_access_size = 4 150 } 151 }; 152 153 static void irq_handler(void *opaque, int irq, int level) 154 { 155 struct xlx_pic *p = opaque; 156 157 /* edge triggered interrupt */ 158 if (p->c_kind_of_intr & (1 << irq) && p->regs[R_MER] & 2) { 159 p->regs[R_ISR] |= (level << irq); 160 } 161 162 p->irq_pin_state &= ~(1 << irq); 163 p->irq_pin_state |= level << irq; 164 update_irq(p); 165 } 166 167 static void xilinx_intc_init(Object *obj) 168 { 169 struct xlx_pic *p = XILINX_INTC(obj); 170 171 qdev_init_gpio_in(DEVICE(obj), irq_handler, 32); 172 sysbus_init_irq(SYS_BUS_DEVICE(obj), &p->parent_irq); 173 174 memory_region_init_io(&p->mmio, obj, &pic_ops, p, "xlnx.xps-intc", 175 R_MAX * 4); 176 sysbus_init_mmio(SYS_BUS_DEVICE(obj), &p->mmio); 177 } 178 179 static Property xilinx_intc_properties[] = { 180 DEFINE_PROP_UINT32("kind-of-intr", struct xlx_pic, c_kind_of_intr, 0), 181 DEFINE_PROP_END_OF_LIST(), 182 }; 183 184 static void xilinx_intc_class_init(ObjectClass *klass, void *data) 185 { 186 DeviceClass *dc = DEVICE_CLASS(klass); 187 188 dc->props = xilinx_intc_properties; 189 } 190 191 static const TypeInfo xilinx_intc_info = { 192 .name = TYPE_XILINX_INTC, 193 .parent = TYPE_SYS_BUS_DEVICE, 194 .instance_size = sizeof(struct xlx_pic), 195 .instance_init = xilinx_intc_init, 196 .class_init = xilinx_intc_class_init, 197 }; 198 199 static void xilinx_intc_register_types(void) 200 { 201 type_register_static(&xilinx_intc_info); 202 } 203 204 type_init(xilinx_intc_register_types) 205