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1 /*
2 * Device's clock input and output
3 *
4 * Copyright GreenSocs 2016-2020
5 *
6 * Authors:
7 * Frederic Konrad
8 * Damien Hedde
9 *
10 * This work is licensed under the terms of the GNU GPL, version 2 or later.
11 * See the COPYING file in the top-level directory.
12 */
13
14 #ifndef QDEV_CLOCK_H
15 #define QDEV_CLOCK_H
16
17 #include "hw/core/clock.h"
18
19 /**
20 * qdev_init_clock_in:
21 * @dev: the device to add an input clock to
22 * @name: the name of the clock (can't be NULL).
23 * @callback: optional callback to be called on update or NULL.
24 * @opaque: argument for the callback
25 * @events: the events the callback should be called for
26 * (logical OR of ClockEvent enum values)
27 * @returns: a pointer to the newly added clock
28 *
29 * Add an input clock to device @dev as a clock named @name.
30 * This adds a child<> property.
31 * The callback will be called with @opaque as opaque parameter.
32 */
33 Clock *qdev_init_clock_in(DeviceState *dev, const char *name,
34 ClockCallback *callback, void *opaque,
35 unsigned int events);
36
37 /**
38 * qdev_init_clock_out:
39 * @dev: the device to add an output clock to
40 * @name: the name of the clock (can't be NULL).
41 * @returns: a pointer to the newly added clock
42 *
43 * Add an output clock to device @dev as a clock named @name.
44 * This adds a child<> property.
45 */
46 Clock *qdev_init_clock_out(DeviceState *dev, const char *name);
47
48 /**
49 * qdev_get_clock_in:
50 * @dev: the device which has the clock
51 * @name: the name of the clock (can't be NULL).
52 * @returns: a pointer to the clock
53 *
54 * Get the input clock @name from @dev or NULL if does not exist.
55 */
56 Clock *qdev_get_clock_in(DeviceState *dev, const char *name);
57
58 /**
59 * qdev_get_clock_out:
60 * @dev: the device which has the clock
61 * @name: the name of the clock (can't be NULL).
62 * @returns: a pointer to the clock
63 *
64 * Get the output clock @name from @dev or NULL if does not exist.
65 */
66 Clock *qdev_get_clock_out(DeviceState *dev, const char *name);
67
68 /**
69 * qdev_connect_clock_in:
70 * @dev: a device
71 * @name: the name of an input clock in @dev
72 * @source: the source clock (an output clock of another device for example)
73 *
74 * Set the source clock of input clock @name of device @dev to @source.
75 * @source period update will be propagated to @name clock.
76 *
77 * Must be called before @dev is realized.
78 */
79 void qdev_connect_clock_in(DeviceState *dev, const char *name, Clock *source);
80
81 /**
82 * qdev_alias_clock:
83 * @dev: the device which has the clock
84 * @name: the name of the clock in @dev (can't be NULL)
85 * @alias_dev: the device to add the clock
86 * @alias_name: the name of the clock in @container
87 * @returns: a pointer to the clock
88 *
89 * Add a clock @alias_name in @alias_dev which is an alias of the clock @name
90 * in @dev. The direction _in_ or _out_ will the same as the original.
91 * An alias clock must not be modified or used by @alias_dev and should
92 * typically be only only for device composition purpose.
93 */
94 Clock *qdev_alias_clock(DeviceState *dev, const char *name,
95 DeviceState *alias_dev, const char *alias_name);
96
97 /**
98 * qdev_finalize_clocklist:
99 * @dev: the device being finalized
100 *
101 * Clear the clocklist from @dev. Only used internally in qdev.
102 */
103 void qdev_finalize_clocklist(DeviceState *dev);
104
105 /**
106 * ClockPortInitElem:
107 * @name: name of the clock (can't be NULL)
108 * @output: indicates whether the clock is input or output
109 * @callback: for inputs, optional callback to be called on clock's update
110 * with device as opaque
111 * @callback_events: mask of ClockEvent values for when callback is called
112 * @offset: optional offset to store the ClockIn or ClockOut pointer in device
113 * state structure (0 means unused)
114 */
115 struct ClockPortInitElem {
116 const char *name;
117 bool is_output;
118 ClockCallback *callback;
119 unsigned int callback_events;
120 size_t offset;
121 };
122
123 #define clock_offset_value(devstate, field) \
124 (offsetof(devstate, field) + \
125 type_check(Clock *, typeof_field(devstate, field)))
126
127 #define QDEV_CLOCK(out_not_in, devstate, field, cb, cbevents) { \
128 .name = (stringify(field)), \
129 .is_output = out_not_in, \
130 .callback = cb, \
131 .callback_events = cbevents, \
132 .offset = clock_offset_value(devstate, field), \
133 }
134
135 /**
136 * QDEV_CLOCK_(IN|OUT):
137 * @devstate: structure type. @dev argument of qdev_init_clocks below must be
138 * a pointer to that same type.
139 * @field: a field in @_devstate (must be Clock*)
140 * @callback: (for input only) callback (or NULL) to be called with the device
141 * state as argument
142 * @cbevents: (for input only) ClockEvent mask for when callback is called
143 *
144 * The name of the clock will be derived from @field
145 */
146 #define QDEV_CLOCK_IN(devstate, field, callback, cbevents) \
147 QDEV_CLOCK(false, devstate, field, callback, cbevents)
148
149 #define QDEV_CLOCK_OUT(devstate, field) \
150 QDEV_CLOCK(true, devstate, field, NULL, 0)
151
152 #define QDEV_CLOCK_END { .name = NULL }
153
154 typedef struct ClockPortInitElem ClockPortInitArray[];
155
156 /**
157 * qdev_init_clocks:
158 * @dev: the device to add clocks to
159 * @clocks: a QDEV_CLOCK_END-terminated array which contains the
160 * clocks information.
161 */
162 void qdev_init_clocks(DeviceState *dev, const ClockPortInitArray clocks);
163
164 #endif /* QDEV_CLOCK_H */