diff options
| -rw-r--r-- | Makefile | 1 | ||||
| -rw-r--r-- | default-configs/arm-softmmu.mak | 1 | ||||
| -rw-r--r-- | hw/ds1338.c | 132 |
3 files changed, 134 insertions, 0 deletions
@@ -132,6 +132,7 @@ obj-$(CONFIG_SSD0303) += ssd0303.o obj-$(CONFIG_SSD0323) += ssd0323.o obj-$(CONFIG_ADS7846) += ads7846.o obj-$(CONFIG_MAX111X) += max111x.o +obj-$(CONFIG_DS1338) += ds1338.o obj-y += i2c.o smbus.o smbus_eeprom.o obj-y += eeprom93xx.o obj-y += scsi-disk.o cdrom.o diff --git a/default-configs/arm-softmmu.mak b/default-configs/arm-softmmu.mak index 35d2cb9c9c..c1b7496c0f 100644 --- a/default-configs/arm-softmmu.mak +++ b/default-configs/arm-softmmu.mak @@ -22,3 +22,4 @@ CONFIG_SSI=y CONFIG_SSI_SD=y CONFIG_LAN9118=y CONFIG_SMC91C111=y +CONFIG_DS1338=y diff --git a/hw/ds1338.c b/hw/ds1338.c new file mode 100644 index 0000000000..6f5ae5e6c1 --- /dev/null +++ b/hw/ds1338.c @@ -0,0 +1,132 @@ +/* + * MAXIM DS1338 I2C RTC+NVRAM + * + * Copyright (c) 2009 CodeSourcery. + * Written by Paul Brook + * + * This code is licenced 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) |