339 lines
8.4 KiB
C
339 lines
8.4 KiB
C
/*
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* QEMU ETRAX Timers
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*
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* Copyright (c) 2007 Edgar E. Iglesias, Axis Communications AB.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "sysbus.h"
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#include "sysemu.h"
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#include "qemu-timer.h"
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#define D(x)
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#define RW_TMR0_DIV 0x00
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#define R_TMR0_DATA 0x04
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#define RW_TMR0_CTRL 0x08
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#define RW_TMR1_DIV 0x10
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#define R_TMR1_DATA 0x14
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#define RW_TMR1_CTRL 0x18
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#define R_TIME 0x38
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#define RW_WD_CTRL 0x40
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#define R_WD_STAT 0x44
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#define RW_INTR_MASK 0x48
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#define RW_ACK_INTR 0x4c
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#define R_INTR 0x50
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#define R_MASKED_INTR 0x54
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struct etrax_timer {
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SysBusDevice busdev;
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qemu_irq irq;
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qemu_irq nmi;
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QEMUBH *bh_t0;
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QEMUBH *bh_t1;
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QEMUBH *bh_wd;
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ptimer_state *ptimer_t0;
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ptimer_state *ptimer_t1;
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ptimer_state *ptimer_wd;
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int wd_hits;
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/* Control registers. */
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uint32_t rw_tmr0_div;
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uint32_t r_tmr0_data;
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uint32_t rw_tmr0_ctrl;
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uint32_t rw_tmr1_div;
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uint32_t r_tmr1_data;
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uint32_t rw_tmr1_ctrl;
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uint32_t rw_wd_ctrl;
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uint32_t rw_intr_mask;
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uint32_t rw_ack_intr;
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uint32_t r_intr;
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uint32_t r_masked_intr;
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};
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static uint32_t timer_readl (void *opaque, target_phys_addr_t addr)
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{
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struct etrax_timer *t = opaque;
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uint32_t r = 0;
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switch (addr) {
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case R_TMR0_DATA:
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r = ptimer_get_count(t->ptimer_t0);
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break;
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case R_TMR1_DATA:
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r = ptimer_get_count(t->ptimer_t1);
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break;
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case R_TIME:
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r = qemu_get_clock(vm_clock) / 10;
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break;
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case RW_INTR_MASK:
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r = t->rw_intr_mask;
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break;
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case R_MASKED_INTR:
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r = t->r_intr & t->rw_intr_mask;
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break;
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default:
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D(printf ("%s %x\n", __func__, addr));
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break;
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}
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return r;
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}
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#define TIMER_SLOWDOWN 1
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static void update_ctrl(struct etrax_timer *t, int tnum)
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{
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unsigned int op;
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unsigned int freq;
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unsigned int freq_hz;
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unsigned int div;
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uint32_t ctrl;
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ptimer_state *timer;
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if (tnum == 0) {
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ctrl = t->rw_tmr0_ctrl;
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div = t->rw_tmr0_div;
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timer = t->ptimer_t0;
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} else {
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ctrl = t->rw_tmr1_ctrl;
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div = t->rw_tmr1_div;
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timer = t->ptimer_t1;
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}
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op = ctrl & 3;
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freq = ctrl >> 2;
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freq_hz = 32000000;
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switch (freq)
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{
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case 0:
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case 1:
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D(printf ("extern or disabled timer clock?\n"));
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break;
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case 4: freq_hz = 29493000; break;
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case 5: freq_hz = 32000000; break;
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case 6: freq_hz = 32768000; break;
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case 7: freq_hz = 100000000; break;
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default:
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abort();
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break;
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}
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D(printf ("freq_hz=%d div=%d\n", freq_hz, div));
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div = div * TIMER_SLOWDOWN;
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div /= 1000;
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freq_hz /= 1000;
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ptimer_set_freq(timer, freq_hz);
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ptimer_set_limit(timer, div, 0);
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switch (op)
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{
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case 0:
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/* Load. */
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ptimer_set_limit(timer, div, 1);
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break;
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case 1:
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/* Hold. */
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ptimer_stop(timer);
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break;
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case 2:
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/* Run. */
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ptimer_run(timer, 0);
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break;
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default:
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abort();
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break;
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}
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}
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static void timer_update_irq(struct etrax_timer *t)
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{
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t->r_intr &= ~(t->rw_ack_intr);
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t->r_masked_intr = t->r_intr & t->rw_intr_mask;
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D(printf("%s: masked_intr=%x\n", __func__, t->r_masked_intr));
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qemu_set_irq(t->irq, !!t->r_masked_intr);
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}
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static void timer0_hit(void *opaque)
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{
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struct etrax_timer *t = opaque;
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t->r_intr |= 1;
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timer_update_irq(t);
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}
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static void timer1_hit(void *opaque)
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{
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struct etrax_timer *t = opaque;
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t->r_intr |= 2;
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timer_update_irq(t);
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}
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static void watchdog_hit(void *opaque)
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{
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struct etrax_timer *t = opaque;
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if (t->wd_hits == 0) {
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/* real hw gives a single tick before reseting but we are
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a bit friendlier to compensate for our slower execution. */
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ptimer_set_count(t->ptimer_wd, 10);
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ptimer_run(t->ptimer_wd, 1);
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qemu_irq_raise(t->nmi);
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}
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else
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qemu_system_reset_request();
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t->wd_hits++;
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}
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static inline void timer_watchdog_update(struct etrax_timer *t, uint32_t value)
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{
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unsigned int wd_en = t->rw_wd_ctrl & (1 << 8);
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unsigned int wd_key = t->rw_wd_ctrl >> 9;
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unsigned int wd_cnt = t->rw_wd_ctrl & 511;
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unsigned int new_key = value >> 9 & ((1 << 7) - 1);
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unsigned int new_cmd = (value >> 8) & 1;
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/* If the watchdog is enabled, they written key must match the
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complement of the previous. */
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wd_key = ~wd_key & ((1 << 7) - 1);
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if (wd_en && wd_key != new_key)
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return;
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D(printf("en=%d new_key=%x oldkey=%x cmd=%d cnt=%d\n",
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wd_en, new_key, wd_key, new_cmd, wd_cnt));
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if (t->wd_hits)
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qemu_irq_lower(t->nmi);
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t->wd_hits = 0;
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ptimer_set_freq(t->ptimer_wd, 760);
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if (wd_cnt == 0)
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wd_cnt = 256;
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ptimer_set_count(t->ptimer_wd, wd_cnt);
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if (new_cmd)
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ptimer_run(t->ptimer_wd, 1);
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else
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ptimer_stop(t->ptimer_wd);
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t->rw_wd_ctrl = value;
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}
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static void
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timer_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
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{
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struct etrax_timer *t = opaque;
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switch (addr)
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{
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case RW_TMR0_DIV:
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t->rw_tmr0_div = value;
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break;
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case RW_TMR0_CTRL:
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D(printf ("RW_TMR0_CTRL=%x\n", value));
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t->rw_tmr0_ctrl = value;
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update_ctrl(t, 0);
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break;
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case RW_TMR1_DIV:
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t->rw_tmr1_div = value;
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break;
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case RW_TMR1_CTRL:
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D(printf ("RW_TMR1_CTRL=%x\n", value));
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t->rw_tmr1_ctrl = value;
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update_ctrl(t, 1);
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break;
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case RW_INTR_MASK:
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D(printf ("RW_INTR_MASK=%x\n", value));
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t->rw_intr_mask = value;
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timer_update_irq(t);
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break;
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case RW_WD_CTRL:
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timer_watchdog_update(t, value);
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break;
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case RW_ACK_INTR:
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t->rw_ack_intr = value;
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timer_update_irq(t);
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t->rw_ack_intr = 0;
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break;
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default:
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printf ("%s " TARGET_FMT_plx " %x\n",
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__func__, addr, value);
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break;
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}
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}
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static CPUReadMemoryFunc * const timer_read[] = {
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NULL, NULL,
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&timer_readl,
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};
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static CPUWriteMemoryFunc * const timer_write[] = {
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NULL, NULL,
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&timer_writel,
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};
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static void etraxfs_timer_reset(void *opaque)
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{
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struct etrax_timer *t = opaque;
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ptimer_stop(t->ptimer_t0);
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ptimer_stop(t->ptimer_t1);
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ptimer_stop(t->ptimer_wd);
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t->rw_wd_ctrl = 0;
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t->r_intr = 0;
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t->rw_intr_mask = 0;
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qemu_irq_lower(t->irq);
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}
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static void etraxfs_timer_init(SysBusDevice *dev)
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{
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struct etrax_timer *t = FROM_SYSBUS(typeof (*t), dev);
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int timer_regs;
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t->bh_t0 = qemu_bh_new(timer0_hit, t);
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t->bh_t1 = qemu_bh_new(timer1_hit, t);
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t->bh_wd = qemu_bh_new(watchdog_hit, t);
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t->ptimer_t0 = ptimer_init(t->bh_t0);
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t->ptimer_t1 = ptimer_init(t->bh_t1);
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t->ptimer_wd = ptimer_init(t->bh_wd);
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sysbus_init_irq(dev, &t->irq);
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sysbus_init_irq(dev, &t->nmi);
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timer_regs = cpu_register_io_memory(timer_read, timer_write, t);
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sysbus_init_mmio(dev, 0x5c, timer_regs);
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qemu_register_reset(etraxfs_timer_reset, t);
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}
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static void etraxfs_timer_register(void)
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{
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sysbus_register_dev("etraxfs,timer", sizeof (struct etrax_timer),
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etraxfs_timer_init);
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}
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device_init(etraxfs_timer_register)
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