diff options
Diffstat (limited to 'hw/ds1338.c')
| -rw-r--r-- | hw/ds1338.c | 236 |
1 files changed, 0 insertions, 236 deletions
diff --git a/hw/ds1338.c b/hw/ds1338.c deleted file mode 100644 index ae7ca9f82d..0000000000 --- a/hw/ds1338.c +++ /dev/null @@ -1,236 +0,0 @@ -/* - * MAXIM DS1338 I2C RTC+NVRAM - * - * Copyright (c) 2009 CodeSourcery. - * Written by Paul Brook - * - * This code is licensed under the GNU GPL v2. - * - * Contributions after 2012-01-13 are licensed under the terms of the - * GNU GPL, version 2 or (at your option) any later version. - */ - -#include "hw/i2c.h" - -/* Size of NVRAM including both the user-accessible area and the - * secondary register area. - */ -#define NVRAM_SIZE 64 - -/* Flags definitions */ -#define SECONDS_CH 0x80 -#define HOURS_12 0x40 -#define HOURS_PM 0x20 -#define CTRL_OSF 0x20 - -typedef struct { - I2CSlave i2c; - int64_t offset; - uint8_t wday_offset; - uint8_t nvram[NVRAM_SIZE]; - int32_t ptr; - bool addr_byte; -} DS1338State; - -static const VMStateDescription vmstate_ds1338 = { - .name = "ds1338", - .version_id = 2, - .minimum_version_id = 1, - .minimum_version_id_old = 1, - .fields = (VMStateField[]) { - VMSTATE_I2C_SLAVE(i2c, DS1338State), - VMSTATE_INT64(offset, DS1338State), - VMSTATE_UINT8_V(wday_offset, DS1338State, 2), - VMSTATE_UINT8_ARRAY(nvram, DS1338State, NVRAM_SIZE), - VMSTATE_INT32(ptr, DS1338State), - VMSTATE_BOOL(addr_byte, DS1338State), - VMSTATE_END_OF_LIST() - } -}; - -static void capture_current_time(DS1338State *s) -{ - /* Capture the current time into the secondary registers - * which will be actually read by the data transfer operation. - */ - struct tm now; - qemu_get_timedate(&now, s->offset); - s->nvram[0] = to_bcd(now.tm_sec); - s->nvram[1] = to_bcd(now.tm_min); - if (s->nvram[2] & HOURS_12) { - int tmp = now.tm_hour; - if (tmp % 12 == 0) { - tmp += 12; - } - if (tmp <= 12) { - s->nvram[2] = HOURS_12 | to_bcd(tmp); - } else { - s->nvram[2] = HOURS_12 | HOURS_PM | to_bcd(tmp - 12); - } - } else { - s->nvram[2] = to_bcd(now.tm_hour); - } - s->nvram[3] = (now.tm_wday + s->wday_offset) % 7 + 1; - s->nvram[4] = to_bcd(now.tm_mday); - s->nvram[5] = to_bcd(now.tm_mon + 1); - s->nvram[6] = to_bcd(now.tm_year - 100); -} - -static void inc_regptr(DS1338State *s) -{ - /* The register pointer wraps around after 0x3F; wraparound - * causes the current time/date to be retransferred into - * the secondary registers. - */ - s->ptr = (s->ptr + 1) & (NVRAM_SIZE - 1); - if (!s->ptr) { - capture_current_time(s); - } -} - -static void ds1338_event(I2CSlave *i2c, enum i2c_event event) -{ - DS1338State *s = FROM_I2C_SLAVE(DS1338State, i2c); - - switch (event) { - case I2C_START_RECV: - /* In h/w, capture happens on any START condition, not just a - * START_RECV, but there is no need to actually capture on - * START_SEND, because the guest can't get at that data - * without going through a START_RECV which would overwrite it. - */ - capture_current_time(s); - break; - case I2C_START_SEND: - s->addr_byte = true; - break; - default: - break; - } -} - -static int ds1338_recv(I2CSlave *i2c) -{ - DS1338State *s = FROM_I2C_SLAVE(DS1338State, i2c); - uint8_t res; - - res = s->nvram[s->ptr]; - inc_regptr(s); - return res; -} - -static int ds1338_send(I2CSlave *i2c, uint8_t data) -{ - DS1338State *s = FROM_I2C_SLAVE(DS1338State, i2c); - if (s->addr_byte) { - s->ptr = data & (NVRAM_SIZE - 1); - s->addr_byte = false; - return 0; - } - if (s->ptr < 7) { - /* Time register. */ - struct tm now; - qemu_get_timedate(&now, s->offset); - switch(s->ptr) { - case 0: - /* TODO: Implement CH (stop) bit. */ - now.tm_sec = from_bcd(data & 0x7f); - break; - case 1: - now.tm_min = from_bcd(data & 0x7f); - break; - case 2: - if (data & HOURS_12) { - int tmp = from_bcd(data & (HOURS_PM - 1)); - if (data & HOURS_PM) { - tmp += 12; - } - if (tmp % 12 == 0) { - tmp -= 12; - } - now.tm_hour = tmp; - } else { - now.tm_hour = from_bcd(data & (HOURS_12 - 1)); - } - break; - case 3: - { - /* The day field is supposed to contain a value in - the range 1-7. Otherwise behavior is undefined. - */ - int user_wday = (data & 7) - 1; - s->wday_offset = (user_wday - now.tm_wday + 7) % 7; - } - break; - case 4: - now.tm_mday = from_bcd(data & 0x3f); - break; - case 5: - now.tm_mon = from_bcd(data & 0x1f) - 1; - break; - case 6: - now.tm_year = from_bcd(data) + 100; - break; - } - s->offset = qemu_timedate_diff(&now); - } else if (s->ptr == 7) { - /* Control register. */ - - /* Ensure bits 2, 3 and 6 will read back as zero. */ - data &= 0xB3; - - /* Attempting to write the OSF flag to logic 1 leaves the - value unchanged. */ - data = (data & ~CTRL_OSF) | (data & s->nvram[s->ptr] & CTRL_OSF); - - s->nvram[s->ptr] = data; - } else { - s->nvram[s->ptr] = data; - } - inc_regptr(s); - return 0; -} - -static int ds1338_init(I2CSlave *i2c) -{ - return 0; -} - -static void ds1338_reset(DeviceState *dev) -{ - DS1338State *s = FROM_I2C_SLAVE(DS1338State, I2C_SLAVE(dev)); - - /* The clock is running and synchronized with the host */ - s->offset = 0; - s->wday_offset = 0; - memset(s->nvram, 0, NVRAM_SIZE); - s->ptr = 0; - s->addr_byte = false; -} - -static void ds1338_class_init(ObjectClass *klass, void *data) -{ - DeviceClass *dc = DEVICE_CLASS(klass); - I2CSlaveClass *k = I2C_SLAVE_CLASS(klass); - - k->init = ds1338_init; - k->event = ds1338_event; - k->recv = ds1338_recv; - k->send = ds1338_send; - dc->reset = ds1338_reset; - dc->vmsd = &vmstate_ds1338; -} - -static const TypeInfo ds1338_info = { - .name = "ds1338", - .parent = TYPE_I2C_SLAVE, - .instance_size = sizeof(DS1338State), - .class_init = ds1338_class_init, -}; - -static void ds1338_register_types(void) -{ - type_register_static(&ds1338_info); -} - -type_init(ds1338_register_types) |