Edgar E. Iglesias | 17628bc | 2009-05-20 20:11:30 +0200 | [diff] [blame] | 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 "sysbus.h" |
| 26 | #include "hw.h" |
| 27 | |
| 28 | #define D(x) |
| 29 | |
| 30 | #define R_ISR 0 |
| 31 | #define R_IPR 1 |
| 32 | #define R_IER 2 |
| 33 | #define R_IAR 3 |
| 34 | #define R_SIE 4 |
| 35 | #define R_CIE 5 |
| 36 | #define R_IVR 6 |
| 37 | #define R_MER 7 |
| 38 | #define R_MAX 8 |
| 39 | |
| 40 | struct xlx_pic |
| 41 | { |
| 42 | SysBusDevice busdev; |
Edgar E. Iglesias | 010f3f5 | 2011-08-26 00:13:47 +0200 | [diff] [blame] | 43 | MemoryRegion mmio; |
Edgar E. Iglesias | 17628bc | 2009-05-20 20:11:30 +0200 | [diff] [blame] | 44 | qemu_irq parent_irq; |
| 45 | |
| 46 | /* Configuration reg chosen at synthesis-time. QEMU populates |
| 47 | the bits at board-setup. */ |
| 48 | uint32_t c_kind_of_intr; |
| 49 | |
| 50 | /* Runtime control registers. */ |
| 51 | uint32_t regs[R_MAX]; |
| 52 | }; |
| 53 | |
| 54 | static void update_irq(struct xlx_pic *p) |
| 55 | { |
| 56 | uint32_t i; |
| 57 | /* Update the pending register. */ |
| 58 | p->regs[R_IPR] = p->regs[R_ISR] & p->regs[R_IER]; |
| 59 | |
| 60 | /* Update the vector register. */ |
| 61 | for (i = 0; i < 32; i++) { |
| 62 | if (p->regs[R_IPR] & (1 << i)) |
| 63 | break; |
| 64 | } |
| 65 | if (i == 32) |
| 66 | i = ~0; |
| 67 | |
| 68 | p->regs[R_IVR] = i; |
| 69 | if ((p->regs[R_MER] & 1) && p->regs[R_IPR]) { |
| 70 | qemu_irq_raise(p->parent_irq); |
| 71 | } else { |
| 72 | qemu_irq_lower(p->parent_irq); |
| 73 | } |
| 74 | } |
| 75 | |
Edgar E. Iglesias | 010f3f5 | 2011-08-26 00:13:47 +0200 | [diff] [blame] | 76 | static uint64_t |
| 77 | pic_read(void *opaque, target_phys_addr_t addr, unsigned int size) |
Edgar E. Iglesias | 17628bc | 2009-05-20 20:11:30 +0200 | [diff] [blame] | 78 | { |
| 79 | struct xlx_pic *p = opaque; |
| 80 | uint32_t r = 0; |
| 81 | |
| 82 | addr >>= 2; |
| 83 | switch (addr) |
| 84 | { |
| 85 | default: |
| 86 | if (addr < ARRAY_SIZE(p->regs)) |
| 87 | r = p->regs[addr]; |
| 88 | break; |
| 89 | |
| 90 | } |
| 91 | D(printf("%s %x=%x\n", __func__, addr * 4, r)); |
| 92 | return r; |
| 93 | } |
| 94 | |
| 95 | static void |
Edgar E. Iglesias | 010f3f5 | 2011-08-26 00:13:47 +0200 | [diff] [blame] | 96 | pic_write(void *opaque, target_phys_addr_t addr, |
| 97 | uint64_t val64, unsigned int size) |
Edgar E. Iglesias | 17628bc | 2009-05-20 20:11:30 +0200 | [diff] [blame] | 98 | { |
| 99 | struct xlx_pic *p = opaque; |
Edgar E. Iglesias | 010f3f5 | 2011-08-26 00:13:47 +0200 | [diff] [blame] | 100 | uint32_t value = val64; |
Edgar E. Iglesias | 17628bc | 2009-05-20 20:11:30 +0200 | [diff] [blame] | 101 | |
| 102 | addr >>= 2; |
| 103 | D(qemu_log("%s addr=%x val=%x\n", __func__, addr * 4, value)); |
| 104 | switch (addr) |
| 105 | { |
| 106 | case R_IAR: |
| 107 | p->regs[R_ISR] &= ~value; /* ACK. */ |
| 108 | break; |
| 109 | case R_SIE: |
| 110 | p->regs[R_IER] |= value; /* Atomic set ie. */ |
| 111 | break; |
| 112 | case R_CIE: |
| 113 | p->regs[R_IER] &= ~value; /* Atomic clear ie. */ |
| 114 | break; |
| 115 | default: |
| 116 | if (addr < ARRAY_SIZE(p->regs)) |
| 117 | p->regs[addr] = value; |
| 118 | break; |
| 119 | } |
| 120 | update_irq(p); |
| 121 | } |
| 122 | |
Edgar E. Iglesias | 010f3f5 | 2011-08-26 00:13:47 +0200 | [diff] [blame] | 123 | static const MemoryRegionOps pic_ops = { |
| 124 | .read = pic_read, |
| 125 | .write = pic_write, |
| 126 | .endianness = DEVICE_NATIVE_ENDIAN, |
| 127 | .valid = { |
| 128 | .min_access_size = 4, |
| 129 | .max_access_size = 4 |
| 130 | } |
Edgar E. Iglesias | 17628bc | 2009-05-20 20:11:30 +0200 | [diff] [blame] | 131 | }; |
| 132 | |
| 133 | static void irq_handler(void *opaque, int irq, int level) |
| 134 | { |
| 135 | struct xlx_pic *p = opaque; |
| 136 | |
| 137 | if (!(p->regs[R_MER] & 2)) { |
| 138 | qemu_irq_lower(p->parent_irq); |
| 139 | return; |
| 140 | } |
| 141 | |
| 142 | /* Update source flops. Don't clear unless level triggered. |
| 143 | Edge triggered interrupts only go away when explicitely acked to |
| 144 | the interrupt controller. */ |
| 145 | if (!(p->c_kind_of_intr & (1 << irq)) || level) { |
| 146 | p->regs[R_ISR] &= ~(1 << irq); |
| 147 | p->regs[R_ISR] |= (level << irq); |
| 148 | } |
| 149 | update_irq(p); |
| 150 | } |
| 151 | |
Gerd Hoffmann | 81a322d | 2009-08-14 10:36:05 +0200 | [diff] [blame] | 152 | static int xilinx_intc_init(SysBusDevice *dev) |
Edgar E. Iglesias | 17628bc | 2009-05-20 20:11:30 +0200 | [diff] [blame] | 153 | { |
| 154 | struct xlx_pic *p = FROM_SYSBUS(typeof (*p), dev); |
Edgar E. Iglesias | 17628bc | 2009-05-20 20:11:30 +0200 | [diff] [blame] | 155 | |
Edgar E. Iglesias | 17628bc | 2009-05-20 20:11:30 +0200 | [diff] [blame] | 156 | qdev_init_gpio_in(&dev->qdev, irq_handler, 32); |
| 157 | sysbus_init_irq(dev, &p->parent_irq); |
| 158 | |
Edgar E. Iglesias | 010f3f5 | 2011-08-26 00:13:47 +0200 | [diff] [blame] | 159 | memory_region_init_io(&p->mmio, &pic_ops, p, "xilinx-pic", R_MAX * 4); |
Avi Kivity | 750ecd4 | 2011-11-27 11:38:10 +0200 | [diff] [blame] | 160 | sysbus_init_mmio(dev, &p->mmio); |
Gerd Hoffmann | 81a322d | 2009-08-14 10:36:05 +0200 | [diff] [blame] | 161 | return 0; |
Edgar E. Iglesias | 17628bc | 2009-05-20 20:11:30 +0200 | [diff] [blame] | 162 | } |
| 163 | |
Gerd Hoffmann | ee6847d | 2009-07-15 13:43:31 +0200 | [diff] [blame] | 164 | static SysBusDeviceInfo xilinx_intc_info = { |
| 165 | .init = xilinx_intc_init, |
| 166 | .qdev.name = "xilinx,intc", |
| 167 | .qdev.size = sizeof(struct xlx_pic), |
| 168 | .qdev.props = (Property[]) { |
Gerd Hoffmann | 8017dc2 | 2009-08-03 17:35:47 +0200 | [diff] [blame] | 169 | DEFINE_PROP_UINT32("kind-of-intr", struct xlx_pic, c_kind_of_intr, 0), |
| 170 | DEFINE_PROP_END_OF_LIST(), |
Gerd Hoffmann | ee6847d | 2009-07-15 13:43:31 +0200 | [diff] [blame] | 171 | } |
| 172 | }; |
| 173 | |
Edgar E. Iglesias | 17628bc | 2009-05-20 20:11:30 +0200 | [diff] [blame] | 174 | static void xilinx_intc_register(void) |
| 175 | { |
Gerd Hoffmann | ee6847d | 2009-07-15 13:43:31 +0200 | [diff] [blame] | 176 | sysbus_register_withprop(&xilinx_intc_info); |
Edgar E. Iglesias | 17628bc | 2009-05-20 20:11:30 +0200 | [diff] [blame] | 177 | } |
| 178 | |
| 179 | device_init(xilinx_intc_register) |