mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-11-05 20:35:44 +00:00
8e31bf388e
Correct typos of "licenced" to "licensed". Reviewed-by: Stefan Weil <weil@mail.berlios.de> Reviewed-by: Andreas F=E4rber <andreas.faerber@web.de> Signed-off-by: Matthew Fernandez <matthew.fernandez@gmail.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
132 lines
3.2 KiB
C
132 lines
3.2 KiB
C
/*
|
|
* MAXIM DS1338 I2C RTC+NVRAM
|
|
*
|
|
* Copyright (c) 2009 CodeSourcery.
|
|
* Written by Paul Brook
|
|
*
|
|
* This code is licensed under the GNU GPL v2.
|
|
*/
|
|
|
|
#include "i2c.h"
|
|
|
|
typedef struct {
|
|
i2c_slave i2c;
|
|
time_t offset;
|
|
struct tm now;
|
|
uint8_t nvram[56];
|
|
int ptr;
|
|
int addr_byte;
|
|
} DS1338State;
|
|
|
|
static void ds1338_event(i2c_slave *i2c, enum i2c_event event)
|
|
{
|
|
DS1338State *s = FROM_I2C_SLAVE(DS1338State, i2c);
|
|
|
|
switch (event) {
|
|
case I2C_START_RECV:
|
|
qemu_get_timedate(&s->now, s->offset);
|
|
s->nvram[0] = to_bcd(s->now.tm_sec);
|
|
s->nvram[1] = to_bcd(s->now.tm_min);
|
|
if (s->nvram[2] & 0x40) {
|
|
s->nvram[2] = (to_bcd((s->now.tm_hour % 12)) + 1) | 0x40;
|
|
if (s->now.tm_hour >= 12) {
|
|
s->nvram[2] |= 0x20;
|
|
}
|
|
} else {
|
|
s->nvram[2] = to_bcd(s->now.tm_hour);
|
|
}
|
|
s->nvram[3] = to_bcd(s->now.tm_wday) + 1;
|
|
s->nvram[4] = to_bcd(s->now.tm_mday);
|
|
s->nvram[5] = to_bcd(s->now.tm_mon) + 1;
|
|
s->nvram[6] = to_bcd(s->now.tm_year - 100);
|
|
break;
|
|
case I2C_START_SEND:
|
|
s->addr_byte = 1;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int ds1338_recv(i2c_slave *i2c)
|
|
{
|
|
DS1338State *s = FROM_I2C_SLAVE(DS1338State, i2c);
|
|
uint8_t res;
|
|
|
|
res = s->nvram[s->ptr];
|
|
s->ptr = (s->ptr + 1) & 0xff;
|
|
return res;
|
|
}
|
|
|
|
static int ds1338_send(i2c_slave *i2c, uint8_t data)
|
|
{
|
|
DS1338State *s = FROM_I2C_SLAVE(DS1338State, i2c);
|
|
if (s->addr_byte) {
|
|
s->ptr = data;
|
|
s->addr_byte = 0;
|
|
return 0;
|
|
}
|
|
s->nvram[s->ptr - 8] = data;
|
|
if (data < 8) {
|
|
qemu_get_timedate(&s->now, s->offset);
|
|
switch(data) {
|
|
case 0:
|
|
/* TODO: Implement CH (stop) bit. */
|
|
s->now.tm_sec = from_bcd(data & 0x7f);
|
|
break;
|
|
case 1:
|
|
s->now.tm_min = from_bcd(data & 0x7f);
|
|
break;
|
|
case 2:
|
|
if (data & 0x40) {
|
|
if (data & 0x20) {
|
|
data = from_bcd(data & 0x4f) + 11;
|
|
} else {
|
|
data = from_bcd(data & 0x1f) - 1;
|
|
}
|
|
} else {
|
|
data = from_bcd(data);
|
|
}
|
|
s->now.tm_hour = data;
|
|
break;
|
|
case 3:
|
|
s->now.tm_wday = from_bcd(data & 7) - 1;
|
|
break;
|
|
case 4:
|
|
s->now.tm_mday = from_bcd(data & 0x3f);
|
|
break;
|
|
case 5:
|
|
s->now.tm_mon = from_bcd(data & 0x1f) - 1;
|
|
case 6:
|
|
s->now.tm_year = from_bcd(data) + 100;
|
|
break;
|
|
case 7:
|
|
/* Control register. Currently ignored. */
|
|
break;
|
|
}
|
|
s->offset = qemu_timedate_diff(&s->now);
|
|
}
|
|
s->ptr = (s->ptr + 1) & 0xff;
|
|
return 0;
|
|
}
|
|
|
|
static int ds1338_init(i2c_slave *i2c)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static I2CSlaveInfo ds1338_info = {
|
|
.qdev.name = "ds1338",
|
|
.qdev.size = sizeof(DS1338State),
|
|
.init = ds1338_init,
|
|
.event = ds1338_event,
|
|
.recv = ds1338_recv,
|
|
.send = ds1338_send,
|
|
};
|
|
|
|
static void ds1338_register_devices(void)
|
|
{
|
|
i2c_register_slave(&ds1338_info);
|
|
}
|
|
|
|
device_init(ds1338_register_devices)
|