1 /* 2 * QEMU ETRAX Interrupt Controller. 3 * 4 * Copyright (c) 2008 Edgar E. Iglesias, Axis Communications AB. 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 "hw/hw.h" 28 //#include "pc.h" 29 //#include "etraxfs.h" 30 31 #define D(x) 32 33 #define R_RW_MASK 0 34 #define R_R_VECT 1 35 #define R_R_MASKED_VECT 2 36 #define R_R_NMI 3 37 #define R_R_GURU 4 38 #define R_MAX 5 39 40 #define TYPE_ETRAX_FS_PIC "etraxfs,pic" 41 #define ETRAX_FS_PIC(obj) \ 42 OBJECT_CHECK(struct etrax_pic, (obj), TYPE_ETRAX_FS_PIC) 43 44 struct etrax_pic 45 { 46 SysBusDevice parent_obj; 47 48 MemoryRegion mmio; 49 void *interrupt_vector; 50 qemu_irq parent_irq; 51 qemu_irq parent_nmi; 52 uint32_t regs[R_MAX]; 53 }; 54 55 static void pic_update(struct etrax_pic *fs) 56 { 57 uint32_t vector = 0; 58 int i; 59 60 fs->regs[R_R_MASKED_VECT] = fs->regs[R_R_VECT] & fs->regs[R_RW_MASK]; 61 62 /* The ETRAX interrupt controller signals interrupts to the core 63 through an interrupt request wire and an irq vector bus. If 64 multiple interrupts are simultaneously active it chooses vector 65 0x30 and lets the sw choose the priorities. */ 66 if (fs->regs[R_R_MASKED_VECT]) { 67 uint32_t mv = fs->regs[R_R_MASKED_VECT]; 68 for (i = 0; i < 31; i++) { 69 if (mv & 1) { 70 vector = 0x31 + i; 71 /* Check for multiple interrupts. */ 72 if (mv > 1) 73 vector = 0x30; 74 break; 75 } 76 mv >>= 1; 77 } 78 } 79 80 if (fs->interrupt_vector) { 81 /* hack alert: ptr property */ 82 *(uint32_t*)(fs->interrupt_vector) = vector; 83 } 84 qemu_set_irq(fs->parent_irq, !!vector); 85 } 86 87 static uint64_t 88 pic_read(void *opaque, hwaddr addr, unsigned int size) 89 { 90 struct etrax_pic *fs = opaque; 91 uint32_t rval; 92 93 rval = fs->regs[addr >> 2]; 94 D(printf("%s %x=%x\n", __func__, addr, rval)); 95 return rval; 96 } 97 98 static void pic_write(void *opaque, hwaddr addr, 99 uint64_t value, unsigned int size) 100 { 101 struct etrax_pic *fs = opaque; 102 D(printf("%s addr=%x val=%x\n", __func__, addr, value)); 103 104 if (addr == R_RW_MASK) { 105 fs->regs[R_RW_MASK] = value; 106 pic_update(fs); 107 } 108 } 109 110 static const MemoryRegionOps pic_ops = { 111 .read = pic_read, 112 .write = pic_write, 113 .endianness = DEVICE_NATIVE_ENDIAN, 114 .valid = { 115 .min_access_size = 4, 116 .max_access_size = 4 117 } 118 }; 119 120 static void nmi_handler(void *opaque, int irq, int level) 121 { 122 struct etrax_pic *fs = (void *)opaque; 123 uint32_t mask; 124 125 mask = 1 << irq; 126 if (level) 127 fs->regs[R_R_NMI] |= mask; 128 else 129 fs->regs[R_R_NMI] &= ~mask; 130 131 qemu_set_irq(fs->parent_nmi, !!fs->regs[R_R_NMI]); 132 } 133 134 static void irq_handler(void *opaque, int irq, int level) 135 { 136 struct etrax_pic *fs = (void *)opaque; 137 138 if (irq >= 30) { 139 nmi_handler(opaque, irq, level); 140 return; 141 } 142 143 irq -= 1; 144 fs->regs[R_R_VECT] &= ~(1 << irq); 145 fs->regs[R_R_VECT] |= (!!level << irq); 146 pic_update(fs); 147 } 148 149 static int etraxfs_pic_init(SysBusDevice *sbd) 150 { 151 DeviceState *dev = DEVICE(sbd); 152 struct etrax_pic *s = ETRAX_FS_PIC(dev); 153 154 qdev_init_gpio_in(dev, irq_handler, 32); 155 sysbus_init_irq(sbd, &s->parent_irq); 156 sysbus_init_irq(sbd, &s->parent_nmi); 157 158 memory_region_init_io(&s->mmio, OBJECT(s), &pic_ops, s, 159 "etraxfs-pic", R_MAX * 4); 160 sysbus_init_mmio(sbd, &s->mmio); 161 return 0; 162 } 163 164 static Property etraxfs_pic_properties[] = { 165 DEFINE_PROP_PTR("interrupt_vector", struct etrax_pic, interrupt_vector), 166 DEFINE_PROP_END_OF_LIST(), 167 }; 168 169 static void etraxfs_pic_class_init(ObjectClass *klass, void *data) 170 { 171 DeviceClass *dc = DEVICE_CLASS(klass); 172 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); 173 174 k->init = etraxfs_pic_init; 175 dc->props = etraxfs_pic_properties; 176 /* 177 * Note: pointer property "interrupt_vector" may remain null, thus 178 * no need for dc->cannot_instantiate_with_device_add_yet = true; 179 */ 180 } 181 182 static const TypeInfo etraxfs_pic_info = { 183 .name = TYPE_ETRAX_FS_PIC, 184 .parent = TYPE_SYS_BUS_DEVICE, 185 .instance_size = sizeof(struct etrax_pic), 186 .class_init = etraxfs_pic_class_init, 187 }; 188 189 static void etraxfs_pic_register_types(void) 190 { 191 type_register_static(&etraxfs_pic_info); 192 } 193 194 type_init(etraxfs_pic_register_types) 195