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qemu/hw/m48t08.c

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/*
* QEMU M48T08 NVRAM emulation for Sparc platform
*
* Copyright (c) 2003-2004 Jocelyn Mayer
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "vl.h"
#include "m48t08.h"
//#define DEBUG_NVRAM
#if defined(DEBUG_NVRAM)
#define NVRAM_PRINTF(fmt, args...) do { printf(fmt , ##args); } while (0)
#else
#define NVRAM_PRINTF(fmt, args...) do { } while (0)
#endif
#define NVRAM_MAX_MEM 0x1ff0
#define NVRAM_MAXADDR 0x1fff
struct m48t08_t {
/* RTC management */
time_t time_offset;
time_t stop_time;
/* NVRAM storage */
uint8_t *buffer;
};
/* Fake timer functions */
/* Generic helpers for BCD */
static inline uint8_t toBCD (uint8_t value)
{
return (((value / 10) % 10) << 4) | (value % 10);
}
static inline uint8_t fromBCD (uint8_t BCD)
{
return ((BCD >> 4) * 10) + (BCD & 0x0F);
}
/* RTC management helpers */
static void get_time (m48t08_t *NVRAM, struct tm *tm)
{
time_t t;
t = time(NULL) + NVRAM->time_offset;
#ifdef _WIN32
memcpy(tm,localtime(&t),sizeof(*tm));
#else
localtime_r (&t, tm) ;
#endif
}
static void set_time (m48t08_t *NVRAM, struct tm *tm)
{
time_t now, new_time;
new_time = mktime(tm);
now = time(NULL);
NVRAM->time_offset = new_time - now;
}
/* Direct access to NVRAM */
void m48t08_write (m48t08_t *NVRAM, uint32_t addr, uint8_t val)
{
struct tm tm;
int tmp;
addr &= NVRAM_MAXADDR;
switch (addr) {
case 0x1FF8:
/* control */
NVRAM->buffer[0x1FF8] = (val & ~0xA0) | 0x90;
break;
case 0x1FF9:
/* seconds (BCD) */
tmp = fromBCD(val & 0x7F);
if (tmp >= 0 && tmp <= 59) {
get_time(NVRAM, &tm);
tm.tm_sec = tmp;
set_time(NVRAM, &tm);
}
if ((val & 0x80) ^ (NVRAM->buffer[0x1FF9] & 0x80)) {
if (val & 0x80) {
NVRAM->stop_time = time(NULL);
} else {
NVRAM->time_offset += NVRAM->stop_time - time(NULL);
NVRAM->stop_time = 0;
}
}
NVRAM->buffer[0x1FF9] = val & 0x80;
break;
case 0x1FFA:
/* minutes (BCD) */
tmp = fromBCD(val & 0x7F);
if (tmp >= 0 && tmp <= 59) {
get_time(NVRAM, &tm);
tm.tm_min = tmp;
set_time(NVRAM, &tm);
}
break;
case 0x1FFB:
/* hours (BCD) */
tmp = fromBCD(val & 0x3F);
if (tmp >= 0 && tmp <= 23) {
get_time(NVRAM, &tm);
tm.tm_hour = tmp;
set_time(NVRAM, &tm);
}
break;
case 0x1FFC:
/* day of the week / century */
tmp = fromBCD(val & 0x07);
get_time(NVRAM, &tm);
tm.tm_wday = tmp;
set_time(NVRAM, &tm);
NVRAM->buffer[0x1FFC] = val & 0x40;
break;
case 0x1FFD:
/* date */
tmp = fromBCD(val & 0x1F);
if (tmp != 0) {
get_time(NVRAM, &tm);
tm.tm_mday = tmp;
set_time(NVRAM, &tm);
}
break;
case 0x1FFE:
/* month */
tmp = fromBCD(val & 0x1F);
if (tmp >= 1 && tmp <= 12) {
get_time(NVRAM, &tm);
tm.tm_mon = tmp - 1;
set_time(NVRAM, &tm);
}
break;
case 0x1FFF:
/* year */
tmp = fromBCD(val);
if (tmp >= 0 && tmp <= 99) {
get_time(NVRAM, &tm);
tm.tm_year = fromBCD(val);
set_time(NVRAM, &tm);
}
break;
default:
NVRAM->buffer[addr] = val & 0xFF;
break;
}
}
uint8_t m48t08_read (m48t08_t *NVRAM, uint32_t addr)
{
struct tm tm;
uint8_t retval = 0xFF;
addr &= NVRAM_MAXADDR;
switch (addr) {
case 0x1FF8:
/* control */
goto do_read;
case 0x1FF9:
/* seconds (BCD) */
get_time(NVRAM, &tm);
retval = (NVRAM->buffer[0x1FF9] & 0x80) | toBCD(tm.tm_sec);
break;
case 0x1FFA:
/* minutes (BCD) */
get_time(NVRAM, &tm);
retval = toBCD(tm.tm_min);
break;
case 0x1FFB:
/* hours (BCD) */
get_time(NVRAM, &tm);
retval = toBCD(tm.tm_hour);
break;
case 0x1FFC:
/* day of the week / century */
get_time(NVRAM, &tm);
retval = NVRAM->buffer[0x1FFC] | tm.tm_wday;
break;
case 0x1FFD:
/* date */
get_time(NVRAM, &tm);
retval = toBCD(tm.tm_mday);
break;
case 0x1FFE:
/* month */
get_time(NVRAM, &tm);
retval = toBCD(tm.tm_mon + 1);
break;
case 0x1FFF:
/* year */
get_time(NVRAM, &tm);
retval = toBCD(tm.tm_year);
break;
default:
do_read:
retval = NVRAM->buffer[addr];
break;
}
return retval;
}
static void nvram_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)
{
m48t08_t *NVRAM = opaque;
m48t08_write(NVRAM, addr, value);
}
static void nvram_writew (void *opaque, target_phys_addr_t addr, uint32_t value)
{
m48t08_t *NVRAM = opaque;
m48t08_write(NVRAM, addr, value);
m48t08_write(NVRAM, addr + 1, value >> 8);
}
static void nvram_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
{
m48t08_t *NVRAM = opaque;
m48t08_write(NVRAM, addr, value);
m48t08_write(NVRAM, addr + 1, value >> 8);
m48t08_write(NVRAM, addr + 2, value >> 16);
m48t08_write(NVRAM, addr + 3, value >> 24);
}
static uint32_t nvram_readb (void *opaque, target_phys_addr_t addr)
{
m48t08_t *NVRAM = opaque;
uint32_t retval = 0;
retval = m48t08_read(NVRAM, addr);
return retval;
}
static uint32_t nvram_readw (void *opaque, target_phys_addr_t addr)
{
m48t08_t *NVRAM = opaque;
uint32_t retval = 0;
retval = m48t08_read(NVRAM, addr) << 8;
retval |= m48t08_read(NVRAM, addr + 1);
return retval;
}
static uint32_t nvram_readl (void *opaque, target_phys_addr_t addr)
{
m48t08_t *NVRAM = opaque;
uint32_t retval = 0;
retval = m48t08_read(NVRAM, addr) << 24;
retval |= m48t08_read(NVRAM, addr + 1) << 16;
retval |= m48t08_read(NVRAM, addr + 2) << 8;
retval |= m48t08_read(NVRAM, addr + 3);
return retval;
}
static CPUWriteMemoryFunc *nvram_write[] = {
&nvram_writeb,
&nvram_writew,
&nvram_writel,
};
static CPUReadMemoryFunc *nvram_read[] = {
&nvram_readb,
&nvram_readw,
&nvram_readl,
};
static void nvram_save(QEMUFile *f, void *opaque)
{
m48t08_t *s = opaque;
qemu_put_be32s(f, (uint32_t *)&s->time_offset);
qemu_put_be32s(f, (uint32_t *)&s->stop_time);
qemu_put_buffer(f, s->buffer, 0x2000);
}
static int nvram_load(QEMUFile *f, void *opaque, int version_id)
{
m48t08_t *s = opaque;
if (version_id != 1)
return -EINVAL;
qemu_get_be32s(f, (uint32_t *)&s->time_offset);
qemu_get_be32s(f, (uint32_t *)&s->stop_time);
qemu_get_buffer(f, s->buffer, 0x2000);
return 0;
}
static void m48t08_reset(void *opaque)
{
m48t08_t *s = opaque;
s->time_offset = 0;
s->stop_time = 0;
}
/* Initialisation routine */
m48t08_t *m48t08_init(uint32_t mem_base, uint16_t size)
{
m48t08_t *s;
int mem_index;
s = qemu_mallocz(sizeof(m48t08_t));
if (!s)
return NULL;
s->buffer = qemu_mallocz(size);
if (!s->buffer) {
qemu_free(s);
return NULL;
}
if (mem_base != 0) {
mem_index = cpu_register_io_memory(0, nvram_read, nvram_write, s);
cpu_register_physical_memory(mem_base, 0x2000, mem_index);
}
register_savevm("nvram", mem_base, 1, nvram_save, nvram_load, s);
qemu_register_reset(m48t08_reset, s);
return s;
}
#if 0
struct idprom
{
unsigned char id_format; /* Format identifier (always 0x01) */
unsigned char id_machtype; /* Machine type */
unsigned char id_ethaddr[6]; /* Hardware ethernet address */
long id_date; /* Date of manufacture */
unsigned int id_sernum:24; /* Unique serial number */
unsigned char id_cksum; /* Checksum - xor of the data bytes */
unsigned char reserved[16];
};
#endif
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