root / hw / etraxfs_pic.c @ 4af39611
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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 | e62b5b13 | edgar_igl | #include <stdio.h> |
26 | e62b5b13 | edgar_igl | #include "hw.h" |
27 | 376253ec | aliguori | #include "pc.h" |
28 | 5ef98b47 | edgar_igl | #include "etraxfs.h" |
29 | e62b5b13 | edgar_igl | |
30 | e62b5b13 | edgar_igl | #define D(x)
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31 | e62b5b13 | edgar_igl | |
32 | 8d13fcc0 | Edgar E. Iglesias | #define R_RW_MASK 0 |
33 | 8d13fcc0 | Edgar E. Iglesias | #define R_R_VECT 1 |
34 | 8d13fcc0 | Edgar E. Iglesias | #define R_R_MASKED_VECT 2 |
35 | 8d13fcc0 | Edgar E. Iglesias | #define R_R_NMI 3 |
36 | 8d13fcc0 | Edgar E. Iglesias | #define R_R_GURU 4 |
37 | 8d13fcc0 | Edgar E. Iglesias | #define R_MAX 5 |
38 | 8d13fcc0 | Edgar E. Iglesias | |
39 | b23b0fd0 | Edgar E. Iglesias | struct fs_pic_state
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40 | e62b5b13 | edgar_igl | { |
41 | e62b5b13 | edgar_igl | CPUState *env; |
42 | 8d13fcc0 | Edgar E. Iglesias | uint32_t regs[R_MAX]; |
43 | e62b5b13 | edgar_igl | }; |
44 | e62b5b13 | edgar_igl | |
45 | b23b0fd0 | Edgar E. Iglesias | static void pic_update(struct fs_pic_state *fs) |
46 | 70ea255d | edgar_igl | { |
47 | 70ea255d | edgar_igl | CPUState *env = fs->env; |
48 | 70ea255d | edgar_igl | uint32_t vector = 0;
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49 | 8d13fcc0 | Edgar E. Iglesias | int i;
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50 | 70ea255d | edgar_igl | |
51 | 8d13fcc0 | Edgar E. Iglesias | fs->regs[R_R_MASKED_VECT] = fs->regs[R_R_VECT] & fs->regs[R_RW_MASK]; |
52 | 70ea255d | edgar_igl | |
53 | 70ea255d | edgar_igl | /* The ETRAX interrupt controller signals interrupts to teh core
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54 | 70ea255d | edgar_igl | through an interrupt request wire and an irq vector bus. If
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55 | 70ea255d | edgar_igl | multiple interrupts are simultaneously active it chooses vector
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56 | 70ea255d | edgar_igl | 0x30 and lets the sw choose the priorities. */
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57 | 8d13fcc0 | Edgar E. Iglesias | if (fs->regs[R_R_MASKED_VECT]) {
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58 | 8d13fcc0 | Edgar E. Iglesias | uint32_t mv = fs->regs[R_R_MASKED_VECT]; |
59 | 70ea255d | edgar_igl | for (i = 0; i < 31; i++) { |
60 | 70ea255d | edgar_igl | if (mv & 1) { |
61 | 70ea255d | edgar_igl | vector = 0x31 + i;
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62 | 70ea255d | edgar_igl | /* Check for multiple interrupts. */
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63 | 70ea255d | edgar_igl | if (mv > 1) |
64 | 70ea255d | edgar_igl | vector = 0x30;
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65 | 70ea255d | edgar_igl | break;
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66 | 70ea255d | edgar_igl | } |
67 | 70ea255d | edgar_igl | mv >>= 1;
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68 | 70ea255d | edgar_igl | } |
69 | 70ea255d | edgar_igl | if (vector) {
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70 | 70ea255d | edgar_igl | env->interrupt_vector = vector; |
71 | 70ea255d | edgar_igl | D(printf("%s vector=%x\n", __func__, vector));
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72 | 70ea255d | edgar_igl | cpu_interrupt(env, CPU_INTERRUPT_HARD); |
73 | 70ea255d | edgar_igl | } |
74 | 70ea255d | edgar_igl | } else {
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75 | 70ea255d | edgar_igl | env->interrupt_vector = 0;
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76 | 70ea255d | edgar_igl | cpu_reset_interrupt(env, CPU_INTERRUPT_HARD); |
77 | 70ea255d | edgar_igl | D(printf("%s reset irqs\n", __func__));
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78 | 70ea255d | edgar_igl | } |
79 | e62b5b13 | edgar_igl | } |
80 | e62b5b13 | edgar_igl | |
81 | e62b5b13 | edgar_igl | static uint32_t pic_readl (void *opaque, target_phys_addr_t addr) |
82 | e62b5b13 | edgar_igl | { |
83 | b23b0fd0 | Edgar E. Iglesias | struct fs_pic_state *fs = opaque;
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84 | e62b5b13 | edgar_igl | uint32_t rval; |
85 | e62b5b13 | edgar_igl | |
86 | 8d13fcc0 | Edgar E. Iglesias | rval = fs->regs[addr >> 2];
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87 | e62b5b13 | edgar_igl | D(printf("%s %x=%x\n", __func__, addr, rval));
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88 | e62b5b13 | edgar_igl | return rval;
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89 | e62b5b13 | edgar_igl | } |
90 | e62b5b13 | edgar_igl | |
91 | e62b5b13 | edgar_igl | static void |
92 | e62b5b13 | edgar_igl | pic_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
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93 | e62b5b13 | edgar_igl | { |
94 | b23b0fd0 | Edgar E. Iglesias | struct fs_pic_state *fs = opaque;
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95 | e62b5b13 | edgar_igl | D(printf("%s addr=%x val=%x\n", __func__, addr, value));
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96 | 8d13fcc0 | Edgar E. Iglesias | |
97 | 8d13fcc0 | Edgar E. Iglesias | if (addr == R_RW_MASK) {
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98 | 8d13fcc0 | Edgar E. Iglesias | fs->regs[R_RW_MASK] = value; |
99 | 8d13fcc0 | Edgar E. Iglesias | pic_update(fs); |
100 | e62b5b13 | edgar_igl | } |
101 | e62b5b13 | edgar_igl | } |
102 | e62b5b13 | edgar_igl | |
103 | e62b5b13 | edgar_igl | static CPUReadMemoryFunc *pic_read[] = {
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104 | 70ea255d | edgar_igl | NULL, NULL, |
105 | e62b5b13 | edgar_igl | &pic_readl, |
106 | e62b5b13 | edgar_igl | }; |
107 | e62b5b13 | edgar_igl | |
108 | e62b5b13 | edgar_igl | static CPUWriteMemoryFunc *pic_write[] = {
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109 | 70ea255d | edgar_igl | NULL, NULL, |
110 | e62b5b13 | edgar_igl | &pic_writel, |
111 | e62b5b13 | edgar_igl | }; |
112 | e62b5b13 | edgar_igl | |
113 | 376253ec | aliguori | void pic_info(Monitor *mon)
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114 | e62b5b13 | edgar_igl | { |
115 | e62b5b13 | edgar_igl | } |
116 | e62b5b13 | edgar_igl | |
117 | 376253ec | aliguori | void irq_info(Monitor *mon)
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118 | e62b5b13 | edgar_igl | { |
119 | e62b5b13 | edgar_igl | } |
120 | e62b5b13 | edgar_igl | |
121 | 5ef98b47 | edgar_igl | static void irq_handler(void *opaque, int irq, int level) |
122 | e62b5b13 | edgar_igl | { |
123 | b23b0fd0 | Edgar E. Iglesias | struct fs_pic_state *fs = (void *)opaque; |
124 | 48318011 | edgar_igl | irq -= 1;
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125 | 8d13fcc0 | Edgar E. Iglesias | fs->regs[R_R_VECT] &= ~(1 << irq);
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126 | 8d13fcc0 | Edgar E. Iglesias | fs->regs[R_R_VECT] |= (!!level << irq); |
127 | e62b5b13 | edgar_igl | |
128 | 70ea255d | edgar_igl | pic_update(fs); |
129 | e62b5b13 | edgar_igl | } |
130 | e62b5b13 | edgar_igl | |
131 | 5ef98b47 | edgar_igl | static void nmi_handler(void *opaque, int irq, int level) |
132 | 5ef98b47 | edgar_igl | { |
133 | b23b0fd0 | Edgar E. Iglesias | struct fs_pic_state *fs = (void *)opaque; |
134 | 5ef98b47 | edgar_igl | CPUState *env = fs->env; |
135 | 5ef98b47 | edgar_igl | uint32_t mask; |
136 | 5ef98b47 | edgar_igl | |
137 | 5ef98b47 | edgar_igl | mask = 1 << irq;
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138 | 5ef98b47 | edgar_igl | if (level)
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139 | 8d13fcc0 | Edgar E. Iglesias | fs->regs[R_R_NMI] |= mask; |
140 | 5ef98b47 | edgar_igl | else
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141 | 8d13fcc0 | Edgar E. Iglesias | fs->regs[R_R_NMI] &= ~mask; |
142 | 5ef98b47 | edgar_igl | |
143 | 8d13fcc0 | Edgar E. Iglesias | if (fs->regs[R_R_NMI])
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144 | 5ef98b47 | edgar_igl | cpu_interrupt(env, CPU_INTERRUPT_NMI); |
145 | 5ef98b47 | edgar_igl | else
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146 | 5ef98b47 | edgar_igl | cpu_reset_interrupt(env, CPU_INTERRUPT_NMI); |
147 | 5ef98b47 | edgar_igl | } |
148 | 5ef98b47 | edgar_igl | |
149 | 5ef98b47 | edgar_igl | static void guru_handler(void *opaque, int irq, int level) |
150 | 5ef98b47 | edgar_igl | { |
151 | 2ac71179 | Paul Brook | hw_error("%s unsupported exception\n", __func__);
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152 | 5ef98b47 | edgar_igl | } |
153 | 5ef98b47 | edgar_igl | |
154 | 5ef98b47 | edgar_igl | struct etraxfs_pic *etraxfs_pic_init(CPUState *env, target_phys_addr_t base)
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155 | e62b5b13 | edgar_igl | { |
156 | b23b0fd0 | Edgar E. Iglesias | struct fs_pic_state *fs = NULL; |
157 | 5ef98b47 | edgar_igl | struct etraxfs_pic *pic = NULL; |
158 | e62b5b13 | edgar_igl | int intr_vect_regs;
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159 | e62b5b13 | edgar_igl | |
160 | 5ef98b47 | edgar_igl | pic = qemu_mallocz(sizeof *pic);
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161 | 5ef98b47 | edgar_igl | pic->internal = fs = qemu_mallocz(sizeof *fs);
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162 | e62b5b13 | edgar_igl | |
163 | 5ef98b47 | edgar_igl | fs->env = env; |
164 | 5ef98b47 | edgar_igl | pic->irq = qemu_allocate_irqs(irq_handler, fs, 30);
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165 | 5ef98b47 | edgar_igl | pic->nmi = qemu_allocate_irqs(nmi_handler, fs, 2);
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166 | 5ef98b47 | edgar_igl | pic->guru = qemu_allocate_irqs(guru_handler, fs, 1);
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167 | e62b5b13 | edgar_igl | |
168 | e62b5b13 | edgar_igl | intr_vect_regs = cpu_register_io_memory(0, pic_read, pic_write, fs);
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169 | 8d13fcc0 | Edgar E. Iglesias | cpu_register_physical_memory(base, R_MAX * 4, intr_vect_regs);
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170 | e62b5b13 | edgar_igl | |
171 | e62b5b13 | edgar_igl | return pic;
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172 | e62b5b13 | edgar_igl | } |