264 lines
6.7 KiB
C
264 lines
6.7 KiB
C
/* This file is part of the program psim.
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Copyright (C) 1994-1996, Andrew Cagney <cagney@highland.com.au>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _HW_NVRAM_C_
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#define _HW_NVRAM_C_
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#ifndef STATIC_INLINE_HW_NVRAM
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#define STATIC_INLINE_HW_NVRAM STATIC_INLINE
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#endif
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#include "device_table.h"
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#ifdef HAVE_TIME_H
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#include <time.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#else
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#ifdef HAVE_STRINGS_H
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#include <strings.h>
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#endif
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#endif
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/* DEVICE
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nvram - non-volatile memory with clock
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DESCRIPTION
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This device implements a small byte addressable non-volatile
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memory. The top 8 bytes of this memory include a real-time clock.
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PROPERTIES
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reg = <address> <size> (required)
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Specify the address/size of this device within its parents address
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space.
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timezone = <integer> (optional)
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Adjustment to the hosts current GMT (in seconds) that should be
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applied when updating the NVRAM's clock. If no timezone is
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specified, zero (GMT or UCT) is assumed.
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*/
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typedef struct _hw_nvram_device {
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unsigned8 *memory;
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unsigned sizeof_memory;
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#ifdef HAVE_TIME_H
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time_t host_time;
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#else
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long host_time;
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#endif
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unsigned timezone;
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/* useful */
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unsigned addr_year;
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unsigned addr_month;
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unsigned addr_date;
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unsigned addr_day;
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unsigned addr_hour;
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unsigned addr_minutes;
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unsigned addr_seconds;
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unsigned addr_control;
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} hw_nvram_device;
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static void *
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hw_nvram_create(const char *name,
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const device_unit *unit_address,
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const char *args)
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{
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hw_nvram_device *nvram = ZALLOC(hw_nvram_device);
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return nvram;
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}
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typedef struct _hw_nvram_reg_spec {
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unsigned32 base;
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unsigned32 size;
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} hw_nvram_reg_spec;
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static void
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hw_nvram_init_address(device *me)
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{
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hw_nvram_device *nvram = (hw_nvram_device*)device_data(me);
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/* use the generic init code to attach this device to its parent bus */
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generic_device_init_address(me);
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/* find the first non zero reg property and use that as the device
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size */
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if (nvram->sizeof_memory == 0) {
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reg_property_spec reg;
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int reg_nr;
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for (reg_nr = 0;
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device_find_reg_array_property(me, "reg", reg_nr, ®);
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reg_nr++) {
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unsigned attach_size;
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if (device_size_to_attach_size(device_parent(me),
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®.size, &attach_size,
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me)) {
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nvram->sizeof_memory = attach_size;
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break;
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}
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}
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if (nvram->sizeof_memory == 0)
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device_error(me, "reg property must contain a non-zero phys-addr:size tupple");
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if (nvram->sizeof_memory < 8)
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device_error(me, "NVRAM must be at least 8 bytes in size");
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}
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/* initialize the hw_nvram */
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if (nvram->memory == NULL) {
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nvram->memory = zalloc(nvram->sizeof_memory);
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}
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else
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memset(nvram->memory, 0, nvram->sizeof_memory);
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if (device_find_property(me, "timezone") == NULL)
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nvram->timezone = 0;
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else
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nvram->timezone = device_find_integer_property(me, "timezone");
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nvram->addr_year = nvram->sizeof_memory - 1;
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nvram->addr_month = nvram->sizeof_memory - 2;
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nvram->addr_date = nvram->sizeof_memory - 3;
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nvram->addr_day = nvram->sizeof_memory - 4;
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nvram->addr_hour = nvram->sizeof_memory - 5;
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nvram->addr_minutes = nvram->sizeof_memory - 6;
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nvram->addr_seconds = nvram->sizeof_memory - 7;
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nvram->addr_control = nvram->sizeof_memory - 8;
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}
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static int
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hw_nvram_bcd(int val)
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{
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val = val % 100;
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if (val < 0)
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val += 100;
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return ((val / 10) << 4) + (val % 10);
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}
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/* If reached an update interval and allowed, update the clock within
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the hw_nvram. While this function could be implemented using events
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it isn't on the assumption that the HW_NVRAM will hardly ever be
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referenced and hence there is little need in keeping the clock
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continually up-to-date */
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static void
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hw_nvram_update_clock(hw_nvram_device *nvram,
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cpu *processor)
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{
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#ifdef HAVE_TIME_H
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if (!(nvram->memory[nvram->addr_control] & 0xc0)) {
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time_t host_time = time(NULL);
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if (nvram->host_time != host_time) {
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time_t nvtime = host_time + nvram->timezone;
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struct tm *clock = gmtime(&nvtime);
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nvram->host_time = host_time;
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nvram->memory[nvram->addr_year] = hw_nvram_bcd(clock->tm_year);
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nvram->memory[nvram->addr_month] = hw_nvram_bcd(clock->tm_mon + 1);
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nvram->memory[nvram->addr_date] = hw_nvram_bcd(clock->tm_mday);
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nvram->memory[nvram->addr_day] = hw_nvram_bcd(clock->tm_wday + 1);
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nvram->memory[nvram->addr_hour] = hw_nvram_bcd(clock->tm_hour);
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nvram->memory[nvram->addr_minutes] = hw_nvram_bcd(clock->tm_min);
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nvram->memory[nvram->addr_seconds] = hw_nvram_bcd(clock->tm_sec);
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}
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}
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#else
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error("fixme - where do I find out GMT\n");
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#endif
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}
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static void
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hw_nvram_set_clock(hw_nvram_device *nvram, cpu *processor)
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{
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error ("fixme - how do I set the localtime\n");
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}
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static unsigned
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hw_nvram_io_read_buffer(device *me,
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void *dest,
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int space,
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unsigned_word addr,
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unsigned nr_bytes,
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cpu *processor,
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unsigned_word cia)
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{
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int i;
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hw_nvram_device *nvram = (hw_nvram_device*)device_data(me);
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for (i = 0; i < nr_bytes; i++) {
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unsigned address = (addr + i) % nvram->sizeof_memory;
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unsigned8 data = nvram->memory[address];
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hw_nvram_update_clock(nvram, processor);
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((unsigned8*)dest)[i] = data;
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}
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return nr_bytes;
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}
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static unsigned
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hw_nvram_io_write_buffer(device *me,
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const void *source,
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int space,
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unsigned_word addr,
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unsigned nr_bytes,
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cpu *processor,
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unsigned_word cia)
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{
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int i;
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hw_nvram_device *nvram = (hw_nvram_device*)device_data(me);
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for (i = 0; i < nr_bytes; i++) {
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unsigned address = (addr + i) % nvram->sizeof_memory;
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unsigned8 data = ((unsigned8*)source)[i];
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if (address == nvram->addr_control
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&& (data & 0x80) == 0
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&& (nvram->memory[address] & 0x80) == 0x80)
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hw_nvram_set_clock(nvram, processor);
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else
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hw_nvram_update_clock(nvram, processor);
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nvram->memory[address] = data;
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}
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return nr_bytes;
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}
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static device_callbacks const hw_nvram_callbacks = {
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{ hw_nvram_init_address, },
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{ NULL, }, /* address */
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{ hw_nvram_io_read_buffer, hw_nvram_io_write_buffer }, /* IO */
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};
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const device_descriptor hw_nvram_device_descriptor[] = {
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{ "nvram", hw_nvram_create, &hw_nvram_callbacks },
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{ NULL },
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};
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#endif /* _HW_NVRAM_C_ */
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