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/* |
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* Copyright (C) 2006-2007 Anders Gavare. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* |
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* $Id: dev_rtc.c,v 1.7 2007/06/15 19:57:34 debug Exp $ |
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* |
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* COMMENT: A generic Real-Time Clock device, for the test machines |
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* |
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* It can be used to retrieve the current system time, and to cause periodic |
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* interrupts. |
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*/ |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <sys/time.h> |
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|
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#include "cpu.h" |
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#include "device.h" |
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#include "emul.h" |
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#include "machine.h" |
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#include "memory.h" |
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#include "misc.h" |
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#include "timer.h" |
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|
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#include "testmachine/dev_rtc.h" |
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|
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|
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#define DEV_RTC_TICK_SHIFT 14 |
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|
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struct rtc_data { |
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struct interrupt irq; |
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int pending_interrupts; |
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|
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int hz; |
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struct timer *timer; |
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|
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struct timeval cur_time; |
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}; |
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|
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|
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/* |
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* timer_tick(): |
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* |
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* This function is called d->hz times per second. |
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*/ |
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static void timer_tick(struct timer *t, void *extra) |
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{ |
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struct rtc_data *d = (struct rtc_data *) extra; |
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d->pending_interrupts ++; |
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} |
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|
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|
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DEVICE_TICK(rtc) |
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{ |
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struct rtc_data *d = extra; |
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|
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if (d->pending_interrupts > 0) |
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INTERRUPT_ASSERT(d->irq); |
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else |
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INTERRUPT_DEASSERT(d->irq); |
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} |
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|
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|
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DEVICE_ACCESS(rtc) |
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{ |
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struct rtc_data *d = extra; |
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uint64_t idata = 0, odata = 0; |
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|
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if (writeflag == MEM_WRITE) |
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idata = memory_readmax64(cpu, data, len); |
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|
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switch (relative_addr) { |
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|
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case DEV_RTC_TRIGGER_READ: |
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gettimeofday(&d->cur_time, NULL); |
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break; |
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|
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case DEV_RTC_SEC: |
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odata = d->cur_time.tv_sec; |
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break; |
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|
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case DEV_RTC_USEC: |
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odata = d->cur_time.tv_usec; |
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break; |
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|
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case DEV_RTC_HZ: |
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if (writeflag == MEM_READ) { |
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odata = d->hz; |
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} else { |
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d->hz = idata; |
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|
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if (d->hz == 0) { |
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/* Remove the timer, if any: */ |
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if (d->timer != NULL) |
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timer_remove(d->timer); |
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|
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d->timer = NULL; |
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d->pending_interrupts = 0; |
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} else { |
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/* Add a timer, or update the existing one: */ |
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if (d->timer == NULL) |
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d->timer = timer_add(d->hz, |
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timer_tick, d); |
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else |
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timer_update_frequency(d->timer, d->hz); |
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} |
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} |
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break; |
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|
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case DEV_RTC_INTERRUPT_ACK: |
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if (d->pending_interrupts > 0) |
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d->pending_interrupts --; |
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|
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INTERRUPT_DEASSERT(d->irq); |
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|
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/* TODO: Reassert the interrupt here, if |
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d->pending_interrupts is still above zero? */ |
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|
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break; |
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|
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default:if (writeflag == MEM_WRITE) { |
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fatal("[ rtc: unimplemented write to " |
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"offset 0x%x: data=0x%x ]\n", (int) |
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relative_addr, (int)idata); |
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} else { |
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fatal("[ rtc: unimplemented read from " |
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"offset 0x%x ]\n", (int)relative_addr); |
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} |
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} |
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|
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if (writeflag == MEM_READ) |
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memory_writemax64(cpu, data, len, odata); |
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|
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return 1; |
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} |
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|
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|
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DEVINIT(rtc) |
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{ |
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struct rtc_data *d; |
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|
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CHECK_ALLOCATION(d = malloc(sizeof(struct rtc_data))); |
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memset(d, 0, sizeof(struct rtc_data)); |
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|
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INTERRUPT_CONNECT(devinit->interrupt_path, d->irq); |
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|
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memory_device_register(devinit->machine->memory, devinit->name, |
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devinit->addr, DEV_RTC_LENGTH, dev_rtc_access, (void *)d, |
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DM_DEFAULT, NULL); |
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|
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machine_add_tickfunction(devinit->machine, |
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dev_rtc_tick, d, DEV_RTC_TICK_SHIFT); |
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|
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return 1; |
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} |
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