root / hw / etraxfs_timer.c @ 87ecb68b
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/*
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* QEMU ETRAX System Emulator
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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 <stdio.h> |
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#include <sys/time.h> |
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#include "hw.h" |
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#include "qemu-timer.h" |
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void etrax_ack_irq(CPUState *env, uint32_t mask);
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#define R_TIME 0xb001e038 |
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#define RW_TMR0_DIV 0xb001e000 |
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#define R_TMR0_DATA 0xb001e004 |
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#define RW_TMR0_CTRL 0xb001e008 |
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#define RW_TMR1_DIV 0xb001e010 |
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#define R_TMR1_DATA 0xb001e014 |
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#define RW_TMR1_CTRL 0xb001e018 |
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#define RW_INTR_MASK 0xb001e048 |
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#define RW_ACK_INTR 0xb001e04c |
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#define R_INTR 0xb001e050 |
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#define R_MASKED_INTR 0xb001e054 |
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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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struct fs_timer_t {
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QEMUBH *bh; |
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unsigned int limit; |
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int scale;
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ptimer_state *ptimer; |
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CPUState *env; |
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qemu_irq *irq; |
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uint32_t mask; |
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}; |
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static struct fs_timer_t timer0; |
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/* diff two timevals. Return a single int in us. */
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int diff_timeval_us(struct timeval *a, struct timeval *b) |
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{ |
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int diff;
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/* assume these values are signed. */
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diff = (a->tv_sec - b->tv_sec) * 1000 * 1000; |
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diff += (a->tv_usec - b->tv_usec); |
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return diff;
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} |
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static uint32_t timer_readb (void *opaque, target_phys_addr_t addr) |
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{ |
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CPUState *env = opaque; |
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uint32_t r = 0;
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printf ("%s %x pc=%x\n", __func__, addr, env->pc);
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return r;
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} |
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static uint32_t timer_readw (void *opaque, target_phys_addr_t addr) |
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{ |
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CPUState *env = opaque; |
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uint32_t r = 0;
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printf ("%s %x pc=%x\n", __func__, addr, env->pc);
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return r;
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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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CPUState *env = 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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break;
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case R_TMR1_DATA:
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printf ("R_TMR1_DATA\n");
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break;
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case R_TIME:
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{ |
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static struct timeval last; |
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struct timeval now;
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gettimeofday(&now, NULL);
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if (!(last.tv_sec == 0 && last.tv_usec == 0)) { |
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r = diff_timeval_us(&now, &last); |
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r *= 1000; /* convert to ns. */ |
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r++; /* make sure we increase for each call. */
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} |
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last = now; |
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break;
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} |
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case RW_INTR_MASK:
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r = rw_intr_mask; |
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break;
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case R_MASKED_INTR:
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r = r_intr & rw_intr_mask; |
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break;
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default:
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printf ("%s %x p=%x\n", __func__, addr, env->pc);
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break;
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} |
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return r;
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} |
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static void |
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timer_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)
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{ |
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CPUState *env = opaque; |
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printf ("%s %x %x pc=%x\n", __func__, addr, value, env->pc);
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} |
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static void |
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timer_writew (void *opaque, target_phys_addr_t addr, uint32_t value)
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{ |
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CPUState *env = opaque; |
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printf ("%s %x %x pc=%x\n", __func__, addr, value, env->pc);
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} |
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static void write_ctrl(struct fs_timer_t *t, uint32_t v) |
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{ |
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int op;
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int freq;
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int freq_hz;
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op = v & 3;
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freq = v >> 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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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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printf ("freq_hz=%d limit=%d\n", freq_hz, t->limit);
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t->scale = 0;
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if (t->limit > 2048) |
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{ |
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t->scale = 2048;
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ptimer_set_period(timer0.ptimer, freq_hz / t->scale); |
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} |
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printf ("op=%d\n", op);
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switch (op)
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{ |
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case 0: |
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printf ("limit=%d %d\n", t->limit, t->limit/t->scale);
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ptimer_set_limit(t->ptimer, t->limit / t->scale, 1);
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break;
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case 1: |
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ptimer_stop(t->ptimer); |
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break;
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case 2: |
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ptimer_run(t->ptimer, 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_ack_irq(void) |
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{ |
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if (!(r_intr & timer0.mask & rw_intr_mask)) {
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qemu_irq_lower(timer0.irq[0]);
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etrax_ack_irq(timer0.env, 1 << 0x1b); |
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} |
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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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CPUState *env = opaque; |
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printf ("%s %x %x pc=%x\n",
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__func__, addr, value, env->pc); |
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switch (addr)
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{ |
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case RW_TMR0_DIV:
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printf ("RW_TMR0_DIV=%x\n", value);
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timer0.limit = value; |
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break;
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case RW_TMR0_CTRL:
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printf ("RW_TMR0_CTRL=%x\n", value);
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write_ctrl(&timer0, value); |
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break;
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case RW_TMR1_DIV:
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printf ("RW_TMR1_DIV=%x\n", value);
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break;
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case RW_TMR1_CTRL:
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printf ("RW_TMR1_CTRL=%x\n", value);
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break;
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case RW_INTR_MASK:
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printf ("RW_INTR_MASK=%x\n", value);
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rw_intr_mask = value; |
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break;
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case RW_ACK_INTR:
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r_intr &= ~value; |
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timer_ack_irq(); |
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break;
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default:
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printf ("%s %x %x pc=%x\n",
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__func__, addr, value, env->pc); |
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break;
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} |
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} |
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static CPUReadMemoryFunc *timer_read[] = {
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&timer_readb, |
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&timer_readw, |
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&timer_readl, |
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}; |
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static CPUWriteMemoryFunc *timer_write[] = {
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&timer_writeb, |
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&timer_writew, |
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&timer_writel, |
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}; |
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static void timer_irq(void *opaque) |
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{ |
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struct fs_timer_t *t = opaque;
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r_intr |= t->mask; |
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if (t->mask & rw_intr_mask) {
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qemu_irq_raise(t->irq[0]);
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} |
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} |
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void etraxfs_timer_init(CPUState *env, qemu_irq *irqs)
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{ |
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int timer_regs;
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timer0.bh = qemu_bh_new(timer_irq, &timer0); |
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timer0.ptimer = ptimer_init(timer0.bh); |
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timer0.irq = irqs + 0x1b;
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timer0.mask = 1;
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timer0.env = env; |
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timer_regs = cpu_register_io_memory(0, timer_read, timer_write, env);
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cpu_register_physical_memory (0xb001e000, 0x5c, timer_regs); |
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} |