4 * Copyright (c) 2007 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
28 #include "qemu-timer.h"
32 #define RW_TMR0_DIV 0x00
33 #define R_TMR0_DATA 0x04
34 #define RW_TMR0_CTRL 0x08
35 #define RW_TMR1_DIV 0x10
36 #define R_TMR1_DATA 0x14
37 #define RW_TMR1_CTRL 0x18
39 #define RW_WD_CTRL 0x40
40 #define R_WD_STAT 0x44
41 #define RW_INTR_MASK 0x48
42 #define RW_ACK_INTR 0x4c
44 #define R_MASKED_INTR 0x54
54 ptimer_state *ptimer_t0;
55 ptimer_state *ptimer_t1;
56 ptimer_state *ptimer_wd;
61 /* Control registers. */
64 uint32_t rw_tmr0_ctrl;
68 uint32_t rw_tmr1_ctrl;
72 uint32_t rw_intr_mask;
75 uint32_t r_masked_intr;
78 static uint32_t timer_rinvalid (void *opaque, target_phys_addr_t addr)
80 struct fs_timer_t *t = opaque;
81 CPUState *env = t->env;
82 cpu_abort(env, "Unsupported short access. reg=" TARGET_FMT_plx "\n",
87 static uint32_t timer_readl (void *opaque, target_phys_addr_t addr)
89 struct fs_timer_t *t = opaque;
96 D(printf ("R_TMR1_DATA\n"));
99 r = qemu_get_clock(vm_clock) / 10;
105 r = t->r_intr & t->rw_intr_mask;
108 D(printf ("%s %x\n", __func__, addr));
115 timer_winvalid (void *opaque, target_phys_addr_t addr, uint32_t value)
117 struct fs_timer_t *t = opaque;
118 CPUState *env = t->env;
119 cpu_abort(env, "Unsupported short access. reg=" TARGET_FMT_plx "\n",
123 #define TIMER_SLOWDOWN 1
124 static void update_ctrl(struct fs_timer_t *t, int tnum)
128 unsigned int freq_hz;
135 ctrl = t->rw_tmr0_ctrl;
136 div = t->rw_tmr0_div;
137 timer = t->ptimer_t0;
139 ctrl = t->rw_tmr1_ctrl;
140 div = t->rw_tmr1_div;
141 timer = t->ptimer_t1;
153 D(printf ("extern or disabled timer clock?\n"));
155 case 4: freq_hz = 29493000; break;
156 case 5: freq_hz = 32000000; break;
157 case 6: freq_hz = 32768000; break;
158 case 7: freq_hz = 100001000; break;
164 D(printf ("freq_hz=%d div=%d\n", freq_hz, div));
165 div = div * TIMER_SLOWDOWN;
168 ptimer_set_freq(timer, freq_hz);
169 ptimer_set_limit(timer, div, 0);
175 ptimer_set_limit(timer, div, 1);
183 ptimer_run(timer, 0);
191 static void timer_update_irq(struct fs_timer_t *t)
193 t->r_intr &= ~(t->rw_ack_intr);
194 t->r_masked_intr = t->r_intr & t->rw_intr_mask;
196 D(printf("%s: masked_intr=%x\n", __func__, t->r_masked_intr));
197 if (t->r_masked_intr)
198 qemu_irq_raise(t->irq[0]);
200 qemu_irq_lower(t->irq[0]);
203 static void timer0_hit(void *opaque)
205 struct fs_timer_t *t = opaque;
210 static void timer1_hit(void *opaque)
212 struct fs_timer_t *t = opaque;
217 static void watchdog_hit(void *opaque)
219 struct fs_timer_t *t = opaque;
220 if (t->wd_hits == 0) {
221 /* real hw gives a single tick before reseting but we are
222 a bit friendlier to compensate for our slower execution. */
223 ptimer_set_count(t->ptimer_wd, 10);
224 ptimer_run(t->ptimer_wd, 1);
225 qemu_irq_raise(t->nmi[0]);
228 qemu_system_reset_request();
233 static inline void timer_watchdog_update(struct fs_timer_t *t, uint32_t value)
235 unsigned int wd_en = t->rw_wd_ctrl & (1 << 8);
236 unsigned int wd_key = t->rw_wd_ctrl >> 9;
237 unsigned int wd_cnt = t->rw_wd_ctrl & 511;
238 unsigned int new_key = value >> 9 & ((1 << 7) - 1);
239 unsigned int new_cmd = (value >> 8) & 1;
241 /* If the watchdog is enabled, they written key must match the
242 complement of the previous. */
243 wd_key = ~wd_key & ((1 << 7) - 1);
245 if (wd_en && wd_key != new_key)
248 D(printf("en=%d new_key=%x oldkey=%x cmd=%d cnt=%d\n",
249 wd_en, new_key, wd_key, new_cmd, wd_cnt));
252 qemu_irq_lower(t->nmi[0]);
256 ptimer_set_freq(t->ptimer_wd, 760);
259 ptimer_set_count(t->ptimer_wd, wd_cnt);
261 ptimer_run(t->ptimer_wd, 1);
263 ptimer_stop(t->ptimer_wd);
265 t->rw_wd_ctrl = value;
269 timer_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
271 struct fs_timer_t *t = opaque;
276 t->rw_tmr0_div = value;
279 D(printf ("RW_TMR0_CTRL=%x\n", value));
280 t->rw_tmr0_ctrl = value;
284 t->rw_tmr1_div = value;
287 D(printf ("RW_TMR1_CTRL=%x\n", value));
288 t->rw_tmr1_ctrl = value;
292 D(printf ("RW_INTR_MASK=%x\n", value));
293 t->rw_intr_mask = value;
297 timer_watchdog_update(t, value);
300 t->rw_ack_intr = value;
305 printf ("%s " TARGET_FMT_plx " %x\n",
306 __func__, addr, value);
311 static CPUReadMemoryFunc *timer_read[] = {
317 static CPUWriteMemoryFunc *timer_write[] = {
323 static void etraxfs_timer_reset(void *opaque)
325 struct fs_timer_t *t = opaque;
327 ptimer_stop(t->ptimer_t0);
328 ptimer_stop(t->ptimer_t1);
329 ptimer_stop(t->ptimer_wd);
333 qemu_irq_lower(t->irq[0]);
336 void etraxfs_timer_init(CPUState *env, qemu_irq *irqs, qemu_irq *nmi,
337 target_phys_addr_t base)
339 static struct fs_timer_t *t;
342 t = qemu_mallocz(sizeof *t);
346 t->bh_t0 = qemu_bh_new(timer0_hit, t);
347 t->bh_t1 = qemu_bh_new(timer1_hit, t);
348 t->bh_wd = qemu_bh_new(watchdog_hit, t);
349 t->ptimer_t0 = ptimer_init(t->bh_t0);
350 t->ptimer_t1 = ptimer_init(t->bh_t1);
351 t->ptimer_wd = ptimer_init(t->bh_wd);
356 timer_regs = cpu_register_io_memory(0, timer_read, timer_write, t);
357 cpu_register_physical_memory (base, 0x5c, timer_regs);
359 qemu_register_reset(etraxfs_timer_reset, t);