projects / qemu.git / blame
| Commit | Line | Data |
|---|---|---|
| c6f2594c BZ |
1 | /* |
| 2 | * M41T80 serial rtc emulation | |
| 3 | * | |
| 4 | * Copyright (c) 2018 BALATON Zoltan | |
| 5 | * | |
| 6 | * This work is licensed under the GNU GPL license version 2 or later. | |
| 7 | * | |
| 8 | */ | |
| 9 | ||
| 10 | #include "qemu/osdep.h" | |
| a8d25326 | 11 | #include "qemu-common.h" |
| c6f2594c | 12 | #include "qemu/log.h" |
| 0b8fa32f | 13 | #include "qemu/module.h" |
| c6f2594c BZ |
14 | #include "qemu/timer.h" |
| 15 | #include "qemu/bcd.h" | |
| 16 | #include "hw/i2c/i2c.h" | |
| 17 | ||
| 18 | #define TYPE_M41T80 "m41t80" | |
| 19 | #define M41T80(obj) OBJECT_CHECK(M41t80State, (obj), TYPE_M41T80) | |
| 20 | ||
| 21 | typedef struct M41t80State { | |
| 22 | I2CSlave parent_obj; | |
| 23 | int8_t addr; | |
| 24 | } M41t80State; | |
| 25 | ||
| 26 | static void m41t80_realize(DeviceState *dev, Error **errp) | |
| 27 | { | |
| 28 | M41t80State *s = M41T80(dev); | |
| 29 | ||
| 30 | s->addr = -1; | |
| 31 | } | |
| 32 | ||
| 33 | static int m41t80_send(I2CSlave *i2c, uint8_t data) | |
| 34 | { | |
| 35 | M41t80State *s = M41T80(i2c); | |
| 36 | ||
| 37 | if (s->addr < 0) { | |
| 38 | s->addr = data; | |
| 39 | } else { | |
| 40 | s->addr++; | |
| 41 | } | |
| 42 | return 0; | |
| 43 | } | |
| 44 | ||
| 2ac4c5f4 | 45 | static uint8_t m41t80_recv(I2CSlave *i2c) |
| c6f2594c BZ |
46 | { |
| 47 | M41t80State *s = M41T80(i2c); | |
| 48 | struct tm now; | |
| 49 | qemu_timeval tv; | |
| 50 | ||
| 51 | if (s->addr < 0) { | |
| 52 | s->addr = 0; | |
| 53 | } | |
| 54 | if (s->addr >= 1 && s->addr <= 7) { | |
| 55 | qemu_get_timedate(&now, -1); | |
| 56 | } | |
| 57 | switch (s->addr++) { | |
| 58 | case 0: | |
| 59 | qemu_gettimeofday(&tv); | |
| 60 | return to_bcd(tv.tv_usec / 10000); | |
| 61 | case 1: | |
| 62 | return to_bcd(now.tm_sec); | |
| 63 | case 2: | |
| 64 | return to_bcd(now.tm_min); | |
| 65 | case 3: | |
| 66 | return to_bcd(now.tm_hour); | |
| 67 | case 4: | |
| 68 | return to_bcd(now.tm_wday); | |
| 69 | case 5: | |
| 70 | return to_bcd(now.tm_mday); | |
| 71 | case 6: | |
| 72 | return to_bcd(now.tm_mon + 1); | |
| 73 | case 7: | |
| 74 | return to_bcd(now.tm_year % 100); | |
| 75 | case 8 ... 19: | |
| 76 | qemu_log_mask(LOG_UNIMP, "%s: unimplemented register: %d\n", | |
| 77 | __func__, s->addr - 1); | |
| 78 | return 0; | |
| 79 | default: | |
| 80 | qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid register: %d\n", | |
| 81 | __func__, s->addr - 1); | |
| 82 | return 0; | |
| 83 | } | |
| 84 | } | |
| 85 | ||
| 86 | static int m41t80_event(I2CSlave *i2c, enum i2c_event event) | |
| 87 | { | |
| 88 | M41t80State *s = M41T80(i2c); | |
| 89 | ||
| 90 | if (event == I2C_START_SEND) { | |
| 91 | s->addr = -1; | |
| 92 | } | |
| 93 | return 0; | |
| 94 | } | |
| 95 | ||
| 96 | static void m41t80_class_init(ObjectClass *klass, void *data) | |
| 97 | { | |
| 98 | DeviceClass *dc = DEVICE_CLASS(klass); | |
| 99 | I2CSlaveClass *sc = I2C_SLAVE_CLASS(klass); | |
| 100 | ||
| 101 | dc->realize = m41t80_realize; | |
| 102 | sc->send = m41t80_send; | |
| 103 | sc->recv = m41t80_recv; | |
| 104 | sc->event = m41t80_event; | |
| 105 | } | |
| 106 | ||
| 107 | static const TypeInfo m41t80_info = { | |
| 108 | .name = TYPE_M41T80, | |
| 109 | .parent = TYPE_I2C_SLAVE, | |
| 110 | .instance_size = sizeof(M41t80State), | |
| 111 | .class_init = m41t80_class_init, | |
| 112 | }; | |
| 113 | ||
| 114 | static void m41t80_register_types(void) | |
| 115 | { | |
| 116 | type_register_static(&m41t80_info); | |
| 117 | } | |
| 118 | ||
| 119 | type_init(m41t80_register_types) |