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https://opencores.org/ocsvn/openrisc_2011-10-31/openrisc_2011-10-31/trunk
Subversion Repositories openrisc_2011-10-31
[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [sim/] [ppc/] [hw_nvram.c] - Rev 240
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/* This file is part of the program psim. Copyright (C) 1994-1996, Andrew Cagney <cagney@highland.com.au> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifndef _HW_NVRAM_C_ #define _HW_NVRAM_C_ #ifndef STATIC_INLINE_HW_NVRAM #define STATIC_INLINE_HW_NVRAM STATIC_INLINE #endif #include "device_table.h" #ifdef HAVE_TIME_H #include <time.h> #endif #ifdef HAVE_STRING_H #include <string.h> #else #ifdef HAVE_STRINGS_H #include <strings.h> #endif #endif /* DEVICE nvram - non-volatile memory with clock DESCRIPTION This device implements a small byte addressable non-volatile memory. The top 8 bytes of this memory include a real-time clock. PROPERTIES reg = <address> <size> (required) Specify the address/size of this device within its parents address space. timezone = <integer> (optional) Adjustment to the hosts current GMT (in seconds) that should be applied when updating the NVRAM's clock. If no timezone is specified, zero (GMT or UCT) is assumed. */ typedef struct _hw_nvram_device { unsigned8 *memory; unsigned sizeof_memory; #ifdef HAVE_TIME_H time_t host_time; #else long host_time; #endif unsigned timezone; /* useful */ unsigned addr_year; unsigned addr_month; unsigned addr_date; unsigned addr_day; unsigned addr_hour; unsigned addr_minutes; unsigned addr_seconds; unsigned addr_control; } hw_nvram_device; static void * hw_nvram_create(const char *name, const device_unit *unit_address, const char *args) { hw_nvram_device *nvram = ZALLOC(hw_nvram_device); return nvram; } typedef struct _hw_nvram_reg_spec { unsigned32 base; unsigned32 size; } hw_nvram_reg_spec; static void hw_nvram_init_address(device *me) { hw_nvram_device *nvram = (hw_nvram_device*)device_data(me); /* use the generic init code to attach this device to its parent bus */ generic_device_init_address(me); /* find the first non zero reg property and use that as the device size */ if (nvram->sizeof_memory == 0) { reg_property_spec reg; int reg_nr; for (reg_nr = 0; device_find_reg_array_property(me, "reg", reg_nr, ®); reg_nr++) { unsigned attach_size; if (device_size_to_attach_size(device_parent(me), ®.size, &attach_size, me)) { nvram->sizeof_memory = attach_size; break; } } if (nvram->sizeof_memory == 0) device_error(me, "reg property must contain a non-zero phys-addr:size tupple"); if (nvram->sizeof_memory < 8) device_error(me, "NVRAM must be at least 8 bytes in size"); } /* initialize the hw_nvram */ if (nvram->memory == NULL) { nvram->memory = zalloc(nvram->sizeof_memory); } else memset(nvram->memory, 0, nvram->sizeof_memory); if (device_find_property(me, "timezone") == NULL) nvram->timezone = 0; else nvram->timezone = device_find_integer_property(me, "timezone"); nvram->addr_year = nvram->sizeof_memory - 1; nvram->addr_month = nvram->sizeof_memory - 2; nvram->addr_date = nvram->sizeof_memory - 3; nvram->addr_day = nvram->sizeof_memory - 4; nvram->addr_hour = nvram->sizeof_memory - 5; nvram->addr_minutes = nvram->sizeof_memory - 6; nvram->addr_seconds = nvram->sizeof_memory - 7; nvram->addr_control = nvram->sizeof_memory - 8; } static int hw_nvram_bcd(int val) { val = val % 100; if (val < 0) val += 100; return ((val / 10) << 4) + (val % 10); } /* If reached an update interval and allowed, update the clock within the hw_nvram. While this function could be implemented using events it isn't on the assumption that the HW_NVRAM will hardly ever be referenced and hence there is little need in keeping the clock continually up-to-date */ static void hw_nvram_update_clock(hw_nvram_device *nvram, cpu *processor) { #ifdef HAVE_TIME_H if (!(nvram->memory[nvram->addr_control] & 0xc0)) { time_t host_time = time(NULL); if (nvram->host_time != host_time) { time_t nvtime = host_time + nvram->timezone; struct tm *clock = gmtime(&nvtime); nvram->host_time = host_time; nvram->memory[nvram->addr_year] = hw_nvram_bcd(clock->tm_year); nvram->memory[nvram->addr_month] = hw_nvram_bcd(clock->tm_mon + 1); nvram->memory[nvram->addr_date] = hw_nvram_bcd(clock->tm_mday); nvram->memory[nvram->addr_day] = hw_nvram_bcd(clock->tm_wday + 1); nvram->memory[nvram->addr_hour] = hw_nvram_bcd(clock->tm_hour); nvram->memory[nvram->addr_minutes] = hw_nvram_bcd(clock->tm_min); nvram->memory[nvram->addr_seconds] = hw_nvram_bcd(clock->tm_sec); } } #else error("fixme - where do I find out GMT\n"); #endif } static void hw_nvram_set_clock(hw_nvram_device *nvram, cpu *processor) { error ("fixme - how do I set the localtime\n"); } static unsigned hw_nvram_io_read_buffer(device *me, void *dest, int space, unsigned_word addr, unsigned nr_bytes, cpu *processor, unsigned_word cia) { int i; hw_nvram_device *nvram = (hw_nvram_device*)device_data(me); for (i = 0; i < nr_bytes; i++) { unsigned address = (addr + i) % nvram->sizeof_memory; unsigned8 data = nvram->memory[address]; hw_nvram_update_clock(nvram, processor); ((unsigned8*)dest)[i] = data; } return nr_bytes; } static unsigned hw_nvram_io_write_buffer(device *me, const void *source, int space, unsigned_word addr, unsigned nr_bytes, cpu *processor, unsigned_word cia) { int i; hw_nvram_device *nvram = (hw_nvram_device*)device_data(me); for (i = 0; i < nr_bytes; i++) { unsigned address = (addr + i) % nvram->sizeof_memory; unsigned8 data = ((unsigned8*)source)[i]; if (address == nvram->addr_control && (data & 0x80) == 0 && (nvram->memory[address] & 0x80) == 0x80) hw_nvram_set_clock(nvram, processor); else hw_nvram_update_clock(nvram, processor); nvram->memory[address] = data; } return nr_bytes; } static device_callbacks const hw_nvram_callbacks = { { hw_nvram_init_address, }, { NULL, }, /* address */ { hw_nvram_io_read_buffer, hw_nvram_io_write_buffer }, /* IO */ }; const device_descriptor hw_nvram_device_descriptor[] = { { "nvram", hw_nvram_create, &hw_nvram_callbacks }, { NULL }, }; #endif /* _HW_NVRAM_C_ */
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