235 lines
6.6 KiB
C
235 lines
6.6 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 2 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, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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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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/* NVRAM - non-volatile memory with optional clock.
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Description:
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This device implements a small byte addressable non-volatile memory
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component. The component may include an optional real-time clock
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at its upper addresses.
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Properties:
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reg = <address> <size>. Determine where the device lives in the
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parents address space.
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timezone = <integer>. Adjustment to current host's GMT (in secons)
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that should be applied when updating the NVRAM's clock. */
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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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device *parent)
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{
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hw_nvram_device *hw_nvram = ZALLOC(hw_nvram_device);
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return hw_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 *hw_nvram = (hw_nvram_device*)device_data(me);
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const device_property *reg = device_find_array_property(me, "reg");
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const hw_nvram_reg_spec *spec = reg->array;
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int nr_entries = reg->sizeof_array / sizeof(*spec);
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if ((reg->sizeof_array % sizeof(*spec)) != 0)
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error("devices/%s reg property of incorrect size\n", device_name(me));
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if (nr_entries > 1)
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error("devices/%s reg property contains multiple specs\n",
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device_name(me));
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/* initialize the hw_nvram */
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if (hw_nvram->memory == NULL) {
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hw_nvram->sizeof_memory = BE2H_4(spec->size);
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hw_nvram->memory = zalloc(hw_nvram->sizeof_memory);
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}
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else
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memset(hw_nvram->memory, hw_nvram->sizeof_memory, 0);
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hw_nvram->timezone = device_find_integer_property(me, "timezone");
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hw_nvram->addr_year = hw_nvram->sizeof_memory - 1;
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hw_nvram->addr_month = hw_nvram->sizeof_memory - 2;
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hw_nvram->addr_date = hw_nvram->sizeof_memory - 3;
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hw_nvram->addr_day = hw_nvram->sizeof_memory - 4;
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hw_nvram->addr_hour = hw_nvram->sizeof_memory - 5;
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hw_nvram->addr_minutes = hw_nvram->sizeof_memory - 6;
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hw_nvram->addr_seconds = hw_nvram->sizeof_memory - 7;
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hw_nvram->addr_control = hw_nvram->sizeof_memory - 8;
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device_attach_address(device_parent(me),
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device_name(me),
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attach_callback,
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0 /*address space*/,
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BE2H_4(spec->base),
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hw_nvram->sizeof_memory,
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access_read_write_exec,
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me);
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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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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 *hw_nvram, cpu *processor)
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{
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#ifdef HAVE_TIME_H
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if (!(hw_nvram->memory[hw_nvram->addr_control] & 0xc0)) {
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time_t host_time = time(NULL);
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if (hw_nvram->host_time != host_time) {
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time_t nvtime = hw_nvram->host_time + hw_nvram->timezone;
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struct tm *clock = gmtime(&nvtime);
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hw_nvram->host_time = host_time;
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hw_nvram->memory[hw_nvram->addr_year] = hw_nvram_bcd(clock->tm_year);
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hw_nvram->memory[hw_nvram->addr_month] = hw_nvram_bcd(clock->tm_mon + 1);
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hw_nvram->memory[hw_nvram->addr_date] = hw_nvram_bcd(clock->tm_mday);
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hw_nvram->memory[hw_nvram->addr_day] = hw_nvram_bcd(clock->tm_wday + 1);
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hw_nvram->memory[hw_nvram->addr_hour] = hw_nvram_bcd(clock->tm_hour);
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hw_nvram->memory[hw_nvram->addr_minutes] = hw_nvram_bcd(clock->tm_min);
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hw_nvram->memory[hw_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 *hw_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 *hw_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) % hw_nvram->sizeof_memory;
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unsigned8 data = hw_nvram->memory[address];
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hw_nvram_update_clock(hw_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 *hw_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) % hw_nvram->sizeof_memory;
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unsigned8 data = ((unsigned8*)source)[i];
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if (address == hw_nvram->addr_control
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&& (data & 0x80) == 0
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&& (hw_nvram->memory[address] & 0x80) == 0x80)
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hw_nvram_set_clock(hw_nvram, processor);
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else
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hw_nvram_update_clock(hw_nvram, processor);
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hw_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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