Merge branch 'upstream-merge'
[qemu-kvm/markmc.git] / hw / xilinx_intc.c
blob8ef6474fba1703310855c8806581fab8a20b40b7
1 /*
2 * QEMU Xilinx OPB Interrupt Controller.
4 * Copyright (c) 2009 Edgar E. Iglesias.
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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.
25 #include "sysbus.h"
26 #include "hw.h"
28 #define D(x)
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
40 struct xlx_pic
42 SysBusDevice busdev;
43 qemu_irq parent_irq;
45 /* Configuration reg chosen at synthesis-time. QEMU populates
46 the bits at board-setup. */
47 uint32_t c_kind_of_intr;
49 /* Runtime control registers. */
50 uint32_t regs[R_MAX];
53 static void update_irq(struct xlx_pic *p)
55 uint32_t i;
56 /* Update the pending register. */
57 p->regs[R_IPR] = p->regs[R_ISR] & p->regs[R_IER];
59 /* Update the vector register. */
60 for (i = 0; i < 32; i++) {
61 if (p->regs[R_IPR] & (1 << i))
62 break;
64 if (i == 32)
65 i = ~0;
67 p->regs[R_IVR] = i;
68 if ((p->regs[R_MER] & 1) && p->regs[R_IPR]) {
69 qemu_irq_raise(p->parent_irq);
70 } else {
71 qemu_irq_lower(p->parent_irq);
75 static uint32_t pic_readl (void *opaque, target_phys_addr_t addr)
77 struct xlx_pic *p = opaque;
78 uint32_t r = 0;
80 addr >>= 2;
81 switch (addr)
83 default:
84 if (addr < ARRAY_SIZE(p->regs))
85 r = p->regs[addr];
86 break;
89 D(printf("%s %x=%x\n", __func__, addr * 4, r));
90 return r;
93 static void
94 pic_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
96 struct xlx_pic *p = opaque;
98 addr >>= 2;
99 D(qemu_log("%s addr=%x val=%x\n", __func__, addr * 4, value));
100 switch (addr)
102 case R_IAR:
103 p->regs[R_ISR] &= ~value; /* ACK. */
104 break;
105 case R_SIE:
106 p->regs[R_IER] |= value; /* Atomic set ie. */
107 break;
108 case R_CIE:
109 p->regs[R_IER] &= ~value; /* Atomic clear ie. */
110 break;
111 default:
112 if (addr < ARRAY_SIZE(p->regs))
113 p->regs[addr] = value;
114 break;
116 update_irq(p);
119 static CPUReadMemoryFunc * const pic_read[] = {
120 NULL, NULL,
121 &pic_readl,
124 static CPUWriteMemoryFunc * const pic_write[] = {
125 NULL, NULL,
126 &pic_writel,
129 static void irq_handler(void *opaque, int irq, int level)
131 struct xlx_pic *p = opaque;
133 if (!(p->regs[R_MER] & 2)) {
134 qemu_irq_lower(p->parent_irq);
135 return;
138 /* Update source flops. Don't clear unless level triggered.
139 Edge triggered interrupts only go away when explicitely acked to
140 the interrupt controller. */
141 if (!(p->c_kind_of_intr & (1 << irq)) || level) {
142 p->regs[R_ISR] &= ~(1 << irq);
143 p->regs[R_ISR] |= (level << irq);
145 update_irq(p);
148 static int xilinx_intc_init(SysBusDevice *dev)
150 struct xlx_pic *p = FROM_SYSBUS(typeof (*p), dev);
151 int pic_regs;
153 qdev_init_gpio_in(&dev->qdev, irq_handler, 32);
154 sysbus_init_irq(dev, &p->parent_irq);
156 pic_regs = cpu_register_io_memory(pic_read, pic_write, p);
157 sysbus_init_mmio(dev, R_MAX * 4, pic_regs);
158 return 0;
161 static SysBusDeviceInfo xilinx_intc_info = {
162 .init = xilinx_intc_init,
163 .qdev.name = "xilinx,intc",
164 .qdev.size = sizeof(struct xlx_pic),
165 .qdev.props = (Property[]) {
166 DEFINE_PROP_UINT32("kind-of-intr", struct xlx_pic, c_kind_of_intr, 0),
167 DEFINE_PROP_END_OF_LIST(),
171 static void xilinx_intc_register(void)
173 sysbus_register_withprop(&xilinx_intc_info);
176 device_init(xilinx_intc_register)