| 1 | /* |
| 2 | * Clock migration structure |
| 3 | * |
| 4 | * Copyright GreenSocs 2019-2020 |
| 5 | * |
| 6 | * Authors: |
| 7 | * Damien Hedde |
| 8 | * |
| 9 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 10 | * See the COPYING file in the top-level directory. |
| 11 | */ |
| 12 | |
| 13 | #include "qemu/osdep.h" |
| 14 | #include "migration/vmstate.h" |
| 15 | #include "hw/core/clock.h" |
| 16 | |
| 17 | static bool muldiv_needed(void *opaque) |
| 18 | { |
| 19 | Clock *clk = opaque; |
| 20 | |
| 21 | return clk->multiplier != 1 || clk->divider != 1; |
| 22 | } |
| 23 | |
| 24 | static int clock_pre_load(void *opaque) |
| 25 | { |
| 26 | Clock *clk = opaque; |
| 27 | /* |
| 28 | * The initial out-of-reset settings of the Clock might have been |
| 29 | * configured by the device to be different from what we set |
| 30 | * in clock_initfn(), so we must here set the default values to |
| 31 | * be used if they are not in the inbound migration state. |
| 32 | */ |
| 33 | clk->multiplier = 1; |
| 34 | clk->divider = 1; |
| 35 | |
| 36 | return 0; |
| 37 | } |
| 38 | |
| 39 | const VMStateDescription vmstate_muldiv = { |
| 40 | .name = "clock/muldiv", |
| 41 | .version_id = 1, |
| 42 | .minimum_version_id = 1, |
| 43 | .needed = muldiv_needed, |
| 44 | .fields = (const VMStateField[]) { |
| 45 | VMSTATE_UINT32(multiplier, Clock), |
| 46 | VMSTATE_UINT32(divider, Clock), |
| 47 | VMSTATE_END_OF_LIST() |
| 48 | }, |
| 49 | }; |
| 50 | |
| 51 | const VMStateDescription vmstate_clock = { |
| 52 | .name = "clock", |
| 53 | .version_id = 0, |
| 54 | .minimum_version_id = 0, |
| 55 | .pre_load = clock_pre_load, |
| 56 | .fields = (const VMStateField[]) { |
| 57 | VMSTATE_UINT64(period, Clock), |
| 58 | VMSTATE_END_OF_LIST() |
| 59 | }, |
| 60 | .subsections = (const VMStateDescription * const []) { |
| 61 | &vmstate_muldiv, |
| 62 | NULL |
| 63 | }, |
| 64 | }; |