root / hw / etraxfs_timer.c @ 487414f1
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1 | 83fa1010 | ths | /*
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2 | e62b5b13 | edgar_igl | * QEMU ETRAX Timers
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3 | 83fa1010 | ths | *
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4 | 83fa1010 | ths | * Copyright (c) 2007 Edgar E. Iglesias, Axis Communications AB.
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5 | 83fa1010 | ths | *
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6 | 83fa1010 | ths | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | 83fa1010 | ths | * of this software and associated documentation files (the "Software"), to deal
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8 | 83fa1010 | ths | * in the Software without restriction, including without limitation the rights
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9 | 83fa1010 | ths | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | 83fa1010 | ths | * copies of the Software, and to permit persons to whom the Software is
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11 | 83fa1010 | ths | * furnished to do so, subject to the following conditions:
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12 | 83fa1010 | ths | *
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13 | 83fa1010 | ths | * The above copyright notice and this permission notice shall be included in
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14 | 83fa1010 | ths | * all copies or substantial portions of the Software.
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15 | 83fa1010 | ths | *
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16 | 83fa1010 | ths | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | 83fa1010 | ths | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | 83fa1010 | ths | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | 83fa1010 | ths | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | 83fa1010 | ths | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | 83fa1010 | ths | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | 83fa1010 | ths | * THE SOFTWARE.
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23 | 83fa1010 | ths | */
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24 | 83fa1010 | ths | #include <stdio.h> |
25 | 83fa1010 | ths | #include <sys/time.h> |
26 | 87ecb68b | pbrook | #include "hw.h" |
27 | 5439779e | edgar_igl | #include "sysemu.h" |
28 | 87ecb68b | pbrook | #include "qemu-timer.h" |
29 | 83fa1010 | ths | |
30 | bbaf29c7 | edgar_igl | #define D(x)
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31 | bbaf29c7 | edgar_igl | |
32 | ca87d03b | edgar_igl | #define RW_TMR0_DIV 0x00 |
33 | ca87d03b | edgar_igl | #define R_TMR0_DATA 0x04 |
34 | ca87d03b | edgar_igl | #define RW_TMR0_CTRL 0x08 |
35 | ca87d03b | edgar_igl | #define RW_TMR1_DIV 0x10 |
36 | ca87d03b | edgar_igl | #define R_TMR1_DATA 0x14 |
37 | ca87d03b | edgar_igl | #define RW_TMR1_CTRL 0x18 |
38 | ca87d03b | edgar_igl | #define R_TIME 0x38 |
39 | ca87d03b | edgar_igl | #define RW_WD_CTRL 0x40 |
40 | 5439779e | edgar_igl | #define R_WD_STAT 0x44 |
41 | ca87d03b | edgar_igl | #define RW_INTR_MASK 0x48 |
42 | ca87d03b | edgar_igl | #define RW_ACK_INTR 0x4c |
43 | ca87d03b | edgar_igl | #define R_INTR 0x50 |
44 | ca87d03b | edgar_igl | #define R_MASKED_INTR 0x54 |
45 | 83fa1010 | ths | |
46 | 83fa1010 | ths | struct fs_timer_t {
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47 | ca87d03b | edgar_igl | CPUState *env; |
48 | ca87d03b | edgar_igl | qemu_irq *irq; |
49 | 5ef98b47 | edgar_igl | qemu_irq *nmi; |
50 | ca87d03b | edgar_igl | |
51 | 5439779e | edgar_igl | QEMUBH *bh_t0; |
52 | 5439779e | edgar_igl | QEMUBH *bh_t1; |
53 | 5439779e | edgar_igl | QEMUBH *bh_wd; |
54 | 5439779e | edgar_igl | ptimer_state *ptimer_t0; |
55 | 5439779e | edgar_igl | ptimer_state *ptimer_t1; |
56 | 5439779e | edgar_igl | ptimer_state *ptimer_wd; |
57 | bbaf29c7 | edgar_igl | struct timeval last;
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58 | e62b5b13 | edgar_igl | |
59 | 5ef98b47 | edgar_igl | int wd_hits;
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60 | 5ef98b47 | edgar_igl | |
61 | 60237223 | edgar_igl | /* Control registers. */
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62 | 60237223 | edgar_igl | uint32_t rw_tmr0_div; |
63 | 60237223 | edgar_igl | uint32_t r_tmr0_data; |
64 | 60237223 | edgar_igl | uint32_t rw_tmr0_ctrl; |
65 | 60237223 | edgar_igl | |
66 | 60237223 | edgar_igl | uint32_t rw_tmr1_div; |
67 | 60237223 | edgar_igl | uint32_t r_tmr1_data; |
68 | 60237223 | edgar_igl | uint32_t rw_tmr1_ctrl; |
69 | 60237223 | edgar_igl | |
70 | 5439779e | edgar_igl | uint32_t rw_wd_ctrl; |
71 | 5439779e | edgar_igl | |
72 | e62b5b13 | edgar_igl | uint32_t rw_intr_mask; |
73 | e62b5b13 | edgar_igl | uint32_t rw_ack_intr; |
74 | e62b5b13 | edgar_igl | uint32_t r_intr; |
75 | 60237223 | edgar_igl | uint32_t r_masked_intr; |
76 | 83fa1010 | ths | }; |
77 | 83fa1010 | ths | |
78 | 83fa1010 | ths | static uint32_t timer_readl (void *opaque, target_phys_addr_t addr) |
79 | 83fa1010 | ths | { |
80 | ca87d03b | edgar_igl | struct fs_timer_t *t = opaque;
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81 | 83fa1010 | ths | uint32_t r = 0;
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82 | 83fa1010 | ths | |
83 | 83fa1010 | ths | switch (addr) {
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84 | 83fa1010 | ths | case R_TMR0_DATA:
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85 | ab86bb3b | edgar_igl | r = ptimer_get_count(t->ptimer_t0); |
86 | 83fa1010 | ths | break;
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87 | 83fa1010 | ths | case R_TMR1_DATA:
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88 | ab86bb3b | edgar_igl | r = ptimer_get_count(t->ptimer_t1); |
89 | 83fa1010 | ths | break;
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90 | 83fa1010 | ths | case R_TIME:
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91 | 731abc0d | edgar_igl | r = qemu_get_clock(vm_clock) / 10;
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92 | 83fa1010 | ths | break;
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93 | 83fa1010 | ths | case RW_INTR_MASK:
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94 | ca87d03b | edgar_igl | r = t->rw_intr_mask; |
95 | 83fa1010 | ths | break;
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96 | 83fa1010 | ths | case R_MASKED_INTR:
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97 | ca87d03b | edgar_igl | r = t->r_intr & t->rw_intr_mask; |
98 | 83fa1010 | ths | break;
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99 | 83fa1010 | ths | default:
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100 | d27b2e50 | edgar_igl | D(printf ("%s %x\n", __func__, addr));
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101 | 83fa1010 | ths | break;
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102 | 83fa1010 | ths | } |
103 | 83fa1010 | ths | return r;
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104 | 83fa1010 | ths | } |
105 | 83fa1010 | ths | |
106 | f0b86b14 | edgar_igl | #define TIMER_SLOWDOWN 1 |
107 | 5439779e | edgar_igl | static void update_ctrl(struct fs_timer_t *t, int tnum) |
108 | 83fa1010 | ths | { |
109 | 60237223 | edgar_igl | unsigned int op; |
110 | 60237223 | edgar_igl | unsigned int freq; |
111 | 60237223 | edgar_igl | unsigned int freq_hz; |
112 | 60237223 | edgar_igl | unsigned int div; |
113 | 5439779e | edgar_igl | uint32_t ctrl; |
114 | 5ef98b47 | edgar_igl | |
115 | 5439779e | edgar_igl | ptimer_state *timer; |
116 | 5439779e | edgar_igl | |
117 | 5439779e | edgar_igl | if (tnum == 0) { |
118 | 5439779e | edgar_igl | ctrl = t->rw_tmr0_ctrl; |
119 | 5439779e | edgar_igl | div = t->rw_tmr0_div; |
120 | 5439779e | edgar_igl | timer = t->ptimer_t0; |
121 | 5439779e | edgar_igl | } else {
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122 | 5439779e | edgar_igl | ctrl = t->rw_tmr1_ctrl; |
123 | 5439779e | edgar_igl | div = t->rw_tmr1_div; |
124 | 5439779e | edgar_igl | timer = t->ptimer_t1; |
125 | 5439779e | edgar_igl | } |
126 | 5439779e | edgar_igl | |
127 | 83fa1010 | ths | |
128 | 5439779e | edgar_igl | op = ctrl & 3;
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129 | 5439779e | edgar_igl | freq = ctrl >> 2;
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130 | 83fa1010 | ths | freq_hz = 32000000;
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131 | 83fa1010 | ths | |
132 | 83fa1010 | ths | switch (freq)
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133 | 83fa1010 | ths | { |
134 | 83fa1010 | ths | case 0: |
135 | 83fa1010 | ths | case 1: |
136 | e62b5b13 | edgar_igl | D(printf ("extern or disabled timer clock?\n"));
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137 | 83fa1010 | ths | break;
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138 | 83fa1010 | ths | case 4: freq_hz = 29493000; break; |
139 | 83fa1010 | ths | case 5: freq_hz = 32000000; break; |
140 | 83fa1010 | ths | case 6: freq_hz = 32768000; break; |
141 | ab86bb3b | edgar_igl | case 7: freq_hz = 100000000; break; |
142 | 83fa1010 | ths | default:
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143 | 83fa1010 | ths | abort(); |
144 | 83fa1010 | ths | break;
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145 | 83fa1010 | ths | } |
146 | 83fa1010 | ths | |
147 | 5439779e | edgar_igl | D(printf ("freq_hz=%d div=%d\n", freq_hz, div));
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148 | 5439779e | edgar_igl | div = div * TIMER_SLOWDOWN; |
149 | ab86bb3b | edgar_igl | div /= 1000;
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150 | ab86bb3b | edgar_igl | freq_hz /= 1000;
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151 | 5439779e | edgar_igl | ptimer_set_freq(timer, freq_hz); |
152 | 5439779e | edgar_igl | ptimer_set_limit(timer, div, 0);
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153 | 83fa1010 | ths | |
154 | 83fa1010 | ths | switch (op)
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155 | 83fa1010 | ths | { |
156 | 83fa1010 | ths | case 0: |
157 | 60237223 | edgar_igl | /* Load. */
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158 | 5439779e | edgar_igl | ptimer_set_limit(timer, div, 1);
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159 | 83fa1010 | ths | break;
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160 | 83fa1010 | ths | case 1: |
161 | 60237223 | edgar_igl | /* Hold. */
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162 | 5439779e | edgar_igl | ptimer_stop(timer); |
163 | 83fa1010 | ths | break;
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164 | 83fa1010 | ths | case 2: |
165 | 60237223 | edgar_igl | /* Run. */
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166 | 5439779e | edgar_igl | ptimer_run(timer, 0);
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167 | 83fa1010 | ths | break;
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168 | 83fa1010 | ths | default:
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169 | 83fa1010 | ths | abort(); |
170 | 83fa1010 | ths | break;
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171 | 83fa1010 | ths | } |
172 | 83fa1010 | ths | } |
173 | 83fa1010 | ths | |
174 | 60237223 | edgar_igl | static void timer_update_irq(struct fs_timer_t *t) |
175 | 83fa1010 | ths | { |
176 | 60237223 | edgar_igl | t->r_intr &= ~(t->rw_ack_intr); |
177 | 60237223 | edgar_igl | t->r_masked_intr = t->r_intr & t->rw_intr_mask; |
178 | 60237223 | edgar_igl | |
179 | 60237223 | edgar_igl | D(printf("%s: masked_intr=%x\n", __func__, t->r_masked_intr));
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180 | eb173de6 | edgar_igl | if (t->r_masked_intr)
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181 | 60237223 | edgar_igl | qemu_irq_raise(t->irq[0]);
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182 | 60237223 | edgar_igl | else
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183 | bbaf29c7 | edgar_igl | qemu_irq_lower(t->irq[0]);
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184 | 83fa1010 | ths | } |
185 | 83fa1010 | ths | |
186 | 5439779e | edgar_igl | static void timer0_hit(void *opaque) |
187 | 60237223 | edgar_igl | { |
188 | 63c1d925 | edgar_igl | struct fs_timer_t *t = opaque;
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189 | 60237223 | edgar_igl | t->r_intr |= 1;
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190 | 60237223 | edgar_igl | timer_update_irq(t); |
191 | 60237223 | edgar_igl | } |
192 | 60237223 | edgar_igl | |
193 | 5439779e | edgar_igl | static void timer1_hit(void *opaque) |
194 | 5439779e | edgar_igl | { |
195 | 5439779e | edgar_igl | struct fs_timer_t *t = opaque;
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196 | 5439779e | edgar_igl | t->r_intr |= 2;
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197 | 5439779e | edgar_igl | timer_update_irq(t); |
198 | 5439779e | edgar_igl | } |
199 | 5439779e | edgar_igl | |
200 | 5439779e | edgar_igl | static void watchdog_hit(void *opaque) |
201 | 5439779e | edgar_igl | { |
202 | 5ef98b47 | edgar_igl | struct fs_timer_t *t = opaque;
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203 | 5ef98b47 | edgar_igl | if (t->wd_hits == 0) { |
204 | 5ef98b47 | edgar_igl | /* real hw gives a single tick before reseting but we are
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205 | 5ef98b47 | edgar_igl | a bit friendlier to compensate for our slower execution. */
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206 | 5ef98b47 | edgar_igl | ptimer_set_count(t->ptimer_wd, 10);
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207 | 5ef98b47 | edgar_igl | ptimer_run(t->ptimer_wd, 1);
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208 | 5ef98b47 | edgar_igl | qemu_irq_raise(t->nmi[0]);
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209 | 5ef98b47 | edgar_igl | } |
210 | 5ef98b47 | edgar_igl | else
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211 | 5ef98b47 | edgar_igl | qemu_system_reset_request(); |
212 | 5ef98b47 | edgar_igl | |
213 | 5ef98b47 | edgar_igl | t->wd_hits++; |
214 | 5439779e | edgar_igl | } |
215 | 5439779e | edgar_igl | |
216 | 5439779e | edgar_igl | static inline void timer_watchdog_update(struct fs_timer_t *t, uint32_t value) |
217 | 5439779e | edgar_igl | { |
218 | 5439779e | edgar_igl | unsigned int wd_en = t->rw_wd_ctrl & (1 << 8); |
219 | 5439779e | edgar_igl | unsigned int wd_key = t->rw_wd_ctrl >> 9; |
220 | 5439779e | edgar_igl | unsigned int wd_cnt = t->rw_wd_ctrl & 511; |
221 | 5439779e | edgar_igl | unsigned int new_key = value >> 9 & ((1 << 7) - 1); |
222 | 5439779e | edgar_igl | unsigned int new_cmd = (value >> 8) & 1; |
223 | 5439779e | edgar_igl | |
224 | 5439779e | edgar_igl | /* If the watchdog is enabled, they written key must match the
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225 | 5439779e | edgar_igl | complement of the previous. */
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226 | 5439779e | edgar_igl | wd_key = ~wd_key & ((1 << 7) - 1); |
227 | 5439779e | edgar_igl | |
228 | 5439779e | edgar_igl | if (wd_en && wd_key != new_key)
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229 | 5439779e | edgar_igl | return;
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230 | 5439779e | edgar_igl | |
231 | 5439779e | edgar_igl | D(printf("en=%d new_key=%x oldkey=%x cmd=%d cnt=%d\n",
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232 | 96768ff7 | edgar_igl | wd_en, new_key, wd_key, new_cmd, wd_cnt)); |
233 | 5439779e | edgar_igl | |
234 | 5ef98b47 | edgar_igl | if (t->wd_hits)
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235 | 5ef98b47 | edgar_igl | qemu_irq_lower(t->nmi[0]);
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236 | 5ef98b47 | edgar_igl | |
237 | 5ef98b47 | edgar_igl | t->wd_hits = 0;
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238 | 5ef98b47 | edgar_igl | |
239 | 5439779e | edgar_igl | ptimer_set_freq(t->ptimer_wd, 760);
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240 | 5439779e | edgar_igl | if (wd_cnt == 0) |
241 | 5439779e | edgar_igl | wd_cnt = 256;
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242 | 5439779e | edgar_igl | ptimer_set_count(t->ptimer_wd, wd_cnt); |
243 | 5439779e | edgar_igl | if (new_cmd)
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244 | 5439779e | edgar_igl | ptimer_run(t->ptimer_wd, 1);
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245 | 5439779e | edgar_igl | else
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246 | 5439779e | edgar_igl | ptimer_stop(t->ptimer_wd); |
247 | 5439779e | edgar_igl | |
248 | 5439779e | edgar_igl | t->rw_wd_ctrl = value; |
249 | 5439779e | edgar_igl | } |
250 | 5439779e | edgar_igl | |
251 | 83fa1010 | ths | static void |
252 | 83fa1010 | ths | timer_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
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253 | 83fa1010 | ths | { |
254 | ca87d03b | edgar_igl | struct fs_timer_t *t = opaque;
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255 | bbaf29c7 | edgar_igl | |
256 | 83fa1010 | ths | switch (addr)
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257 | 83fa1010 | ths | { |
258 | 83fa1010 | ths | case RW_TMR0_DIV:
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259 | 60237223 | edgar_igl | t->rw_tmr0_div = value; |
260 | 83fa1010 | ths | break;
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261 | 83fa1010 | ths | case RW_TMR0_CTRL:
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262 | bbaf29c7 | edgar_igl | D(printf ("RW_TMR0_CTRL=%x\n", value));
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263 | 60237223 | edgar_igl | t->rw_tmr0_ctrl = value; |
264 | 5439779e | edgar_igl | update_ctrl(t, 0);
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265 | 83fa1010 | ths | break;
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266 | 83fa1010 | ths | case RW_TMR1_DIV:
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267 | 60237223 | edgar_igl | t->rw_tmr1_div = value; |
268 | 83fa1010 | ths | break;
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269 | 83fa1010 | ths | case RW_TMR1_CTRL:
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270 | bbaf29c7 | edgar_igl | D(printf ("RW_TMR1_CTRL=%x\n", value));
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271 | 5439779e | edgar_igl | t->rw_tmr1_ctrl = value; |
272 | 5439779e | edgar_igl | update_ctrl(t, 1);
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273 | 83fa1010 | ths | break;
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274 | 83fa1010 | ths | case RW_INTR_MASK:
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275 | bbaf29c7 | edgar_igl | D(printf ("RW_INTR_MASK=%x\n", value));
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276 | ca87d03b | edgar_igl | t->rw_intr_mask = value; |
277 | 60237223 | edgar_igl | timer_update_irq(t); |
278 | e62b5b13 | edgar_igl | break;
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279 | e62b5b13 | edgar_igl | case RW_WD_CTRL:
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280 | 5439779e | edgar_igl | timer_watchdog_update(t, value); |
281 | 83fa1010 | ths | break;
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282 | 83fa1010 | ths | case RW_ACK_INTR:
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283 | 60237223 | edgar_igl | t->rw_ack_intr = value; |
284 | 60237223 | edgar_igl | timer_update_irq(t); |
285 | 60237223 | edgar_igl | t->rw_ack_intr = 0;
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286 | 83fa1010 | ths | break;
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287 | 83fa1010 | ths | default:
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288 | d27b2e50 | edgar_igl | printf ("%s " TARGET_FMT_plx " %x\n", |
289 | d27b2e50 | edgar_igl | __func__, addr, value); |
290 | 83fa1010 | ths | break;
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291 | 83fa1010 | ths | } |
292 | 83fa1010 | ths | } |
293 | 83fa1010 | ths | |
294 | 83fa1010 | ths | static CPUReadMemoryFunc *timer_read[] = {
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295 | ab86bb3b | edgar_igl | NULL, NULL, |
296 | 5439779e | edgar_igl | &timer_readl, |
297 | 83fa1010 | ths | }; |
298 | 83fa1010 | ths | |
299 | 83fa1010 | ths | static CPUWriteMemoryFunc *timer_write[] = {
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300 | ab86bb3b | edgar_igl | NULL, NULL, |
301 | 5439779e | edgar_igl | &timer_writel, |
302 | 83fa1010 | ths | }; |
303 | 83fa1010 | ths | |
304 | 5439779e | edgar_igl | static void etraxfs_timer_reset(void *opaque) |
305 | 5439779e | edgar_igl | { |
306 | 5439779e | edgar_igl | struct fs_timer_t *t = opaque;
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307 | 5439779e | edgar_igl | |
308 | 5439779e | edgar_igl | ptimer_stop(t->ptimer_t0); |
309 | 5439779e | edgar_igl | ptimer_stop(t->ptimer_t1); |
310 | 5439779e | edgar_igl | ptimer_stop(t->ptimer_wd); |
311 | 5439779e | edgar_igl | t->rw_wd_ctrl = 0;
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312 | 5439779e | edgar_igl | t->r_intr = 0;
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313 | 5439779e | edgar_igl | t->rw_intr_mask = 0;
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314 | 5439779e | edgar_igl | qemu_irq_lower(t->irq[0]);
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315 | 5439779e | edgar_igl | } |
316 | 5439779e | edgar_igl | |
317 | 5ef98b47 | edgar_igl | void etraxfs_timer_init(CPUState *env, qemu_irq *irqs, qemu_irq *nmi,
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318 | ca87d03b | edgar_igl | target_phys_addr_t base) |
319 | 83fa1010 | ths | { |
320 | ca87d03b | edgar_igl | static struct fs_timer_t *t; |
321 | 83fa1010 | ths | int timer_regs;
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322 | 83fa1010 | ths | |
323 | ca87d03b | edgar_igl | t = qemu_mallocz(sizeof *t);
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324 | bbaf29c7 | edgar_igl | |
325 | 5439779e | edgar_igl | t->bh_t0 = qemu_bh_new(timer0_hit, t); |
326 | 5439779e | edgar_igl | t->bh_t1 = qemu_bh_new(timer1_hit, t); |
327 | 5439779e | edgar_igl | t->bh_wd = qemu_bh_new(watchdog_hit, t); |
328 | 5439779e | edgar_igl | t->ptimer_t0 = ptimer_init(t->bh_t0); |
329 | 5439779e | edgar_igl | t->ptimer_t1 = ptimer_init(t->bh_t1); |
330 | 5439779e | edgar_igl | t->ptimer_wd = ptimer_init(t->bh_wd); |
331 | 60237223 | edgar_igl | t->irq = irqs; |
332 | 5ef98b47 | edgar_igl | t->nmi = nmi; |
333 | ca87d03b | edgar_igl | t->env = env; |
334 | 83fa1010 | ths | |
335 | ca87d03b | edgar_igl | timer_regs = cpu_register_io_memory(0, timer_read, timer_write, t);
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336 | ca87d03b | edgar_igl | cpu_register_physical_memory (base, 0x5c, timer_regs);
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337 | 5439779e | edgar_igl | |
338 | 5439779e | edgar_igl | qemu_register_reset(etraxfs_timer_reset, t); |
339 | 83fa1010 | ths | } |