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1 | /* |
2 | * Copyright (C) 2013 STMicroelectronics (R&D) Limited | |
3 | * Author: Stephen Gallimore <stephen.gallimore@st.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | */ | |
10 | #ifndef __STI_RESET_SYSCFG_H | |
11 | #define __STI_RESET_SYSCFG_H | |
12 | ||
13 | #include <linux/device.h> | |
14 | #include <linux/regmap.h> | |
15 | #include <linux/reset-controller.h> | |
16 | ||
17 | /** | |
18 | * Reset channel description for a system configuration register based | |
19 | * reset controller. | |
20 | * | |
21 | * @compatible: Compatible string of the syscon regmap containing this | |
22 | * channel's control and ack (status) bits. | |
23 | * @reset: Regmap field description of the channel's reset bit. | |
24 | * @ack: Regmap field description of the channel's acknowledge bit. | |
25 | */ | |
26 | struct syscfg_reset_channel_data { | |
27 | const char *compatible; | |
28 | struct reg_field reset; | |
29 | struct reg_field ack; | |
30 | }; | |
31 | ||
32 | #define _SYSCFG_RST_CH(_c, _rr, _rb, _ar, _ab) \ | |
33 | { .compatible = _c, \ | |
34 | .reset = REG_FIELD(_rr, _rb, _rb), \ | |
35 | .ack = REG_FIELD(_ar, _ab, _ab), } | |
36 | ||
37 | #define _SYSCFG_RST_CH_NO_ACK(_c, _rr, _rb) \ | |
38 | { .compatible = _c, \ | |
39 | .reset = REG_FIELD(_rr, _rb, _rb), } | |
40 | ||
41 | /** | |
42 | * Description of a system configuration register based reset controller. | |
43 | * | |
44 | * @wait_for_ack: The controller will wait for reset assert and de-assert to | |
45 | * be "ack'd" in a channel's ack field. | |
46 | * @active_low: Are the resets in this controller active low, i.e. clearing | |
47 | * the reset bit puts the hardware into reset. | |
48 | * @nr_channels: The number of reset channels in this controller. | |
49 | * @channels: An array of reset channel descriptions. | |
50 | */ | |
51 | struct syscfg_reset_controller_data { | |
52 | bool wait_for_ack; | |
53 | bool active_low; | |
54 | int nr_channels; | |
55 | const struct syscfg_reset_channel_data *channels; | |
56 | }; | |
57 | ||
58 | /** | |
59 | * syscfg_reset_probe(): platform device probe function used by syscfg | |
60 | * reset controller drivers. This registers a reset | |
61 | * controller configured by the OF match data for | |
62 | * the compatible device which should be of type | |
63 | * "struct syscfg_reset_controller_data". | |
64 | * | |
65 | * @pdev: platform device | |
66 | */ | |
67 | int syscfg_reset_probe(struct platform_device *pdev); | |
68 | ||
69 | #endif /* __STI_RESET_SYSCFG_H */ |