target-ppc: remove dead code
[qemu/aliguori-queue.git] / hw / etraxfs_pic.c
blobb2c4859949846a500dc7260538b149a71a6a9d1c
1 /*
2 * QEMU ETRAX Interrupt Controller.
4 * Copyright (c) 2008 Edgar E. Iglesias, Axis Communications AB.
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"
27 //#include "pc.h"
28 //#include "etraxfs.h"
30 #define D(x)
32 #define R_RW_MASK 0
33 #define R_R_VECT 1
34 #define R_R_MASKED_VECT 2
35 #define R_R_NMI 3
36 #define R_R_GURU 4
37 #define R_MAX 5
39 struct etrax_pic
41 SysBusDevice busdev;
42 void *interrupt_vector;
43 qemu_irq parent_irq;
44 qemu_irq parent_nmi;
45 uint32_t regs[R_MAX];
48 static void pic_update(struct etrax_pic *fs)
50 uint32_t vector = 0;
51 int i;
53 fs->regs[R_R_MASKED_VECT] = fs->regs[R_R_VECT] & fs->regs[R_RW_MASK];
55 /* The ETRAX interrupt controller signals interrupts to teh core
56 through an interrupt request wire and an irq vector bus. If
57 multiple interrupts are simultaneously active it chooses vector
58 0x30 and lets the sw choose the priorities. */
59 if (fs->regs[R_R_MASKED_VECT]) {
60 uint32_t mv = fs->regs[R_R_MASKED_VECT];
61 for (i = 0; i < 31; i++) {
62 if (mv & 1) {
63 vector = 0x31 + i;
64 /* Check for multiple interrupts. */
65 if (mv > 1)
66 vector = 0x30;
67 break;
69 mv >>= 1;
73 if (fs->interrupt_vector) {
74 /* hack alert: ptr property */
75 *(uint32_t*)(fs->interrupt_vector) = vector;
77 qemu_set_irq(fs->parent_irq, !!vector);
80 static uint32_t pic_readl (void *opaque, target_phys_addr_t addr)
82 struct etrax_pic *fs = opaque;
83 uint32_t rval;
85 rval = fs->regs[addr >> 2];
86 D(printf("%s %x=%x\n", __func__, addr, rval));
87 return rval;
90 static void
91 pic_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
93 struct etrax_pic *fs = opaque;
94 D(printf("%s addr=%x val=%x\n", __func__, addr, value));
96 if (addr == R_RW_MASK) {
97 fs->regs[R_RW_MASK] = value;
98 pic_update(fs);
102 static CPUReadMemoryFunc * const pic_read[] = {
103 NULL, NULL,
104 &pic_readl,
107 static CPUWriteMemoryFunc * const pic_write[] = {
108 NULL, NULL,
109 &pic_writel,
112 static void nmi_handler(void *opaque, int irq, int level)
114 struct etrax_pic *fs = (void *)opaque;
115 uint32_t mask;
117 mask = 1 << irq;
118 if (level)
119 fs->regs[R_R_NMI] |= mask;
120 else
121 fs->regs[R_R_NMI] &= ~mask;
123 qemu_set_irq(fs->parent_nmi, !!fs->regs[R_R_NMI]);
126 static void irq_handler(void *opaque, int irq, int level)
128 struct etrax_pic *fs = (void *)opaque;
130 if (irq >= 30)
131 return nmi_handler(opaque, irq, level);
133 irq -= 1;
134 fs->regs[R_R_VECT] &= ~(1 << irq);
135 fs->regs[R_R_VECT] |= (!!level << irq);
136 pic_update(fs);
139 static int etraxfs_pic_init(SysBusDevice *dev)
141 struct etrax_pic *s = FROM_SYSBUS(typeof (*s), dev);
142 int intr_vect_regs;
144 qdev_init_gpio_in(&dev->qdev, irq_handler, 32);
145 sysbus_init_irq(dev, &s->parent_irq);
146 sysbus_init_irq(dev, &s->parent_nmi);
148 intr_vect_regs = cpu_register_io_memory(pic_read, pic_write, s);
149 sysbus_init_mmio(dev, R_MAX * 4, intr_vect_regs);
150 return 0;
153 static SysBusDeviceInfo etraxfs_pic_info = {
154 .init = etraxfs_pic_init,
155 .qdev.name = "etraxfs,pic",
156 .qdev.size = sizeof(struct etrax_pic),
157 .qdev.props = (Property[]) {
158 DEFINE_PROP_PTR("interrupt_vector", struct etrax_pic, interrupt_vector),
159 DEFINE_PROP_END_OF_LIST(),
163 static void etraxfs_pic_register(void)
165 sysbus_register_withprop(&etraxfs_pic_info);
168 device_init(etraxfs_pic_register)