root / hw / etraxfs_pic.c @ 6693665a
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1 | e62b5b13 | edgar_igl | /*
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2 | e62b5b13 | edgar_igl | * QEMU ETRAX Interrupt Controller.
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3 | e62b5b13 | edgar_igl | *
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4 | e62b5b13 | edgar_igl | * Copyright (c) 2008 Edgar E. Iglesias, Axis Communications AB.
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5 | e62b5b13 | edgar_igl | *
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6 | e62b5b13 | edgar_igl | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | e62b5b13 | edgar_igl | * of this software and associated documentation files (the "Software"), to deal
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8 | e62b5b13 | edgar_igl | * in the Software without restriction, including without limitation the rights
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9 | e62b5b13 | edgar_igl | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | e62b5b13 | edgar_igl | * copies of the Software, and to permit persons to whom the Software is
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11 | e62b5b13 | edgar_igl | * furnished to do so, subject to the following conditions:
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12 | e62b5b13 | edgar_igl | *
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13 | e62b5b13 | edgar_igl | * The above copyright notice and this permission notice shall be included in
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14 | e62b5b13 | edgar_igl | * all copies or substantial portions of the Software.
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15 | e62b5b13 | edgar_igl | *
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16 | e62b5b13 | edgar_igl | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | e62b5b13 | edgar_igl | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | e62b5b13 | edgar_igl | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | e62b5b13 | edgar_igl | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | e62b5b13 | edgar_igl | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | e62b5b13 | edgar_igl | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | e62b5b13 | edgar_igl | * THE SOFTWARE.
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23 | e62b5b13 | edgar_igl | */
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24 | e62b5b13 | edgar_igl | |
25 | fd6dc90b | Edgar E. Iglesias | #include "sysbus.h" |
26 | e62b5b13 | edgar_igl | #include "hw.h" |
27 | 1ad2134f | Paul Brook | //#include "pc.h"
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28 | 1ad2134f | Paul Brook | //#include "etraxfs.h"
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29 | e62b5b13 | edgar_igl | |
30 | e62b5b13 | edgar_igl | #define D(x)
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31 | e62b5b13 | edgar_igl | |
32 | 979d98ca | Edgar E. Iglesias | #define R_RW_MASK 0 |
33 | 979d98ca | Edgar E. Iglesias | #define R_R_VECT 1 |
34 | 979d98ca | Edgar E. Iglesias | #define R_R_MASKED_VECT 2 |
35 | 979d98ca | Edgar E. Iglesias | #define R_R_NMI 3 |
36 | 979d98ca | Edgar E. Iglesias | #define R_R_GURU 4 |
37 | 979d98ca | Edgar E. Iglesias | #define R_MAX 5 |
38 | 8d13fcc0 | Edgar E. Iglesias | |
39 | fd6dc90b | Edgar E. Iglesias | struct etrax_pic
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40 | e62b5b13 | edgar_igl | { |
41 | fd6dc90b | Edgar E. Iglesias | SysBusDevice busdev; |
42 | fd6dc90b | Edgar E. Iglesias | uint32_t *interrupt_vector; |
43 | fd6dc90b | Edgar E. Iglesias | qemu_irq parent_irq; |
44 | fd6dc90b | Edgar E. Iglesias | qemu_irq parent_nmi; |
45 | 979d98ca | Edgar E. Iglesias | uint32_t regs[R_MAX]; |
46 | e62b5b13 | edgar_igl | }; |
47 | e62b5b13 | edgar_igl | |
48 | fd6dc90b | Edgar E. Iglesias | static void pic_update(struct etrax_pic *fs) |
49 | 979d98ca | Edgar E. Iglesias | { |
50 | 979d98ca | Edgar E. Iglesias | uint32_t vector = 0;
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51 | 979d98ca | Edgar E. Iglesias | int i;
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52 | 979d98ca | Edgar E. Iglesias | |
53 | 979d98ca | Edgar E. Iglesias | fs->regs[R_R_MASKED_VECT] = fs->regs[R_R_VECT] & fs->regs[R_RW_MASK]; |
54 | 979d98ca | Edgar E. Iglesias | |
55 | 979d98ca | Edgar E. Iglesias | /* The ETRAX interrupt controller signals interrupts to teh core
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56 | 979d98ca | Edgar E. Iglesias | through an interrupt request wire and an irq vector bus. If
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57 | 979d98ca | Edgar E. Iglesias | multiple interrupts are simultaneously active it chooses vector
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58 | 979d98ca | Edgar E. Iglesias | 0x30 and lets the sw choose the priorities. */
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59 | 979d98ca | Edgar E. Iglesias | if (fs->regs[R_R_MASKED_VECT]) {
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60 | 979d98ca | Edgar E. Iglesias | uint32_t mv = fs->regs[R_R_MASKED_VECT]; |
61 | 979d98ca | Edgar E. Iglesias | for (i = 0; i < 31; i++) { |
62 | 979d98ca | Edgar E. Iglesias | if (mv & 1) { |
63 | 979d98ca | Edgar E. Iglesias | vector = 0x31 + i;
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64 | 979d98ca | Edgar E. Iglesias | /* Check for multiple interrupts. */
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65 | 979d98ca | Edgar E. Iglesias | if (mv > 1) |
66 | 979d98ca | Edgar E. Iglesias | vector = 0x30;
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67 | 979d98ca | Edgar E. Iglesias | break;
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68 | 979d98ca | Edgar E. Iglesias | } |
69 | 979d98ca | Edgar E. Iglesias | mv >>= 1;
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70 | 979d98ca | Edgar E. Iglesias | } |
71 | 979d98ca | Edgar E. Iglesias | } |
72 | fd6dc90b | Edgar E. Iglesias | |
73 | fd6dc90b | Edgar E. Iglesias | if (fs->interrupt_vector) {
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74 | fd6dc90b | Edgar E. Iglesias | *fs->interrupt_vector = vector; |
75 | fd6dc90b | Edgar E. Iglesias | } |
76 | fd6dc90b | Edgar E. Iglesias | qemu_set_irq(fs->parent_irq, !!vector); |
77 | e62b5b13 | edgar_igl | } |
78 | e62b5b13 | edgar_igl | |
79 | e62b5b13 | edgar_igl | static uint32_t pic_readl (void *opaque, target_phys_addr_t addr) |
80 | e62b5b13 | edgar_igl | { |
81 | fd6dc90b | Edgar E. Iglesias | struct etrax_pic *fs = opaque;
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82 | 979d98ca | Edgar E. Iglesias | uint32_t rval; |
83 | e62b5b13 | edgar_igl | |
84 | 979d98ca | Edgar E. Iglesias | rval = fs->regs[addr >> 2];
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85 | 979d98ca | Edgar E. Iglesias | D(printf("%s %x=%x\n", __func__, addr, rval));
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86 | 979d98ca | Edgar E. Iglesias | return rval;
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87 | e62b5b13 | edgar_igl | } |
88 | e62b5b13 | edgar_igl | |
89 | e62b5b13 | edgar_igl | static void |
90 | e62b5b13 | edgar_igl | pic_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
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91 | e62b5b13 | edgar_igl | { |
92 | fd6dc90b | Edgar E. Iglesias | struct etrax_pic *fs = opaque;
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93 | 979d98ca | Edgar E. Iglesias | D(printf("%s addr=%x val=%x\n", __func__, addr, value));
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94 | 8d13fcc0 | Edgar E. Iglesias | |
95 | 979d98ca | Edgar E. Iglesias | if (addr == R_RW_MASK) {
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96 | 979d98ca | Edgar E. Iglesias | fs->regs[R_RW_MASK] = value; |
97 | 979d98ca | Edgar E. Iglesias | pic_update(fs); |
98 | 979d98ca | Edgar E. Iglesias | } |
99 | e62b5b13 | edgar_igl | } |
100 | e62b5b13 | edgar_igl | |
101 | e62b5b13 | edgar_igl | static CPUReadMemoryFunc *pic_read[] = {
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102 | 979d98ca | Edgar E. Iglesias | NULL, NULL, |
103 | 979d98ca | Edgar E. Iglesias | &pic_readl, |
104 | e62b5b13 | edgar_igl | }; |
105 | e62b5b13 | edgar_igl | |
106 | e62b5b13 | edgar_igl | static CPUWriteMemoryFunc *pic_write[] = {
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107 | 979d98ca | Edgar E. Iglesias | NULL, NULL, |
108 | 979d98ca | Edgar E. Iglesias | &pic_writel, |
109 | e62b5b13 | edgar_igl | }; |
110 | e62b5b13 | edgar_igl | |
111 | 5ef98b47 | edgar_igl | static void nmi_handler(void *opaque, int irq, int level) |
112 | 979d98ca | Edgar E. Iglesias | { |
113 | fd6dc90b | Edgar E. Iglesias | struct etrax_pic *fs = (void *)opaque; |
114 | 979d98ca | Edgar E. Iglesias | uint32_t mask; |
115 | 979d98ca | Edgar E. Iglesias | |
116 | 979d98ca | Edgar E. Iglesias | mask = 1 << irq;
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117 | 979d98ca | Edgar E. Iglesias | if (level)
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118 | 979d98ca | Edgar E. Iglesias | fs->regs[R_R_NMI] |= mask; |
119 | 979d98ca | Edgar E. Iglesias | else
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120 | 979d98ca | Edgar E. Iglesias | fs->regs[R_R_NMI] &= ~mask; |
121 | 979d98ca | Edgar E. Iglesias | |
122 | fd6dc90b | Edgar E. Iglesias | qemu_set_irq(fs->parent_nmi, !!fs->regs[R_R_NMI]); |
123 | 5ef98b47 | edgar_igl | } |
124 | 5ef98b47 | edgar_igl | |
125 | 73cfd29f | Edgar E. Iglesias | static void irq_handler(void *opaque, int irq, int level) |
126 | 979d98ca | Edgar E. Iglesias | { |
127 | fd6dc90b | Edgar E. Iglesias | struct etrax_pic *fs = (void *)opaque; |
128 | 73cfd29f | Edgar E. Iglesias | |
129 | 979d98ca | Edgar E. Iglesias | if (irq >= 30) |
130 | 979d98ca | Edgar E. Iglesias | return nmi_handler(opaque, irq, level);
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131 | 73cfd29f | Edgar E. Iglesias | |
132 | 979d98ca | Edgar E. Iglesias | irq -= 1;
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133 | 979d98ca | Edgar E. Iglesias | fs->regs[R_R_VECT] &= ~(1 << irq);
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134 | 979d98ca | Edgar E. Iglesias | fs->regs[R_R_VECT] |= (!!level << irq); |
135 | 979d98ca | Edgar E. Iglesias | pic_update(fs); |
136 | 5ef98b47 | edgar_igl | } |
137 | 5ef98b47 | edgar_igl | |
138 | fd6dc90b | Edgar E. Iglesias | static void etraxfs_pic_init(SysBusDevice *dev) |
139 | e62b5b13 | edgar_igl | { |
140 | fd6dc90b | Edgar E. Iglesias | struct etrax_pic *s = FROM_SYSBUS(typeof (*s), dev);
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141 | 979d98ca | Edgar E. Iglesias | int intr_vect_regs;
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142 | e62b5b13 | edgar_igl | |
143 | fd6dc90b | Edgar E. Iglesias | s->interrupt_vector = qdev_get_prop_ptr(&dev->qdev, "interrupt_vector");
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144 | 067a3ddc | Paul Brook | qdev_init_gpio_in(&dev->qdev, irq_handler, 32);
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145 | fd6dc90b | Edgar E. Iglesias | sysbus_init_irq(dev, &s->parent_irq); |
146 | fd6dc90b | Edgar E. Iglesias | sysbus_init_irq(dev, &s->parent_nmi); |
147 | e62b5b13 | edgar_igl | |
148 | fd6dc90b | Edgar E. Iglesias | intr_vect_regs = cpu_register_io_memory(0, pic_read, pic_write, s);
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149 | fd6dc90b | Edgar E. Iglesias | sysbus_init_mmio(dev, R_MAX * 4, intr_vect_regs);
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150 | e62b5b13 | edgar_igl | } |
151 | fd6dc90b | Edgar E. Iglesias | |
152 | fd6dc90b | Edgar E. Iglesias | static void etraxfs_pic_register(void) |
153 | fd6dc90b | Edgar E. Iglesias | { |
154 | fd6dc90b | Edgar E. Iglesias | sysbus_register_dev("etraxfs,pic", sizeof (struct etrax_pic), |
155 | fd6dc90b | Edgar E. Iglesias | etraxfs_pic_init); |
156 | fd6dc90b | Edgar E. Iglesias | } |
157 | fd6dc90b | Edgar E. Iglesias | |
158 | fd6dc90b | Edgar E. Iglesias | device_init(etraxfs_pic_register) |