xref: /openbmc/linux/drivers/clk/qcom/gdsc.h (revision a8fe58ce)
1 /*
2  * Copyright (c) 2015, The Linux Foundation. All rights reserved.
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 and
6  * only version 2 as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11  * GNU General Public License for more details.
12  */
13 
14 #ifndef __QCOM_GDSC_H__
15 #define __QCOM_GDSC_H__
16 
17 #include <linux/err.h>
18 #include <linux/pm_domain.h>
19 
20 struct regmap;
21 struct reset_controller_dev;
22 
23 /* Powerdomain allowable state bitfields */
24 #define PWRSTS_OFF		BIT(0)
25 #define PWRSTS_RET		BIT(1)
26 #define PWRSTS_ON		BIT(2)
27 #define PWRSTS_OFF_ON		(PWRSTS_OFF | PWRSTS_ON)
28 #define PWRSTS_RET_ON		(PWRSTS_RET | PWRSTS_ON)
29 
30 /**
31  * struct gdsc - Globally Distributed Switch Controller
32  * @pd: generic power domain
33  * @regmap: regmap for MMIO accesses
34  * @gdscr: gsdc control register
35  * @cxcs: offsets of branch registers to toggle mem/periph bits in
36  * @cxc_count: number of @cxcs
37  * @pwrsts: Possible powerdomain power states
38  * @resets: ids of resets associated with this gdsc
39  * @reset_count: number of @resets
40  * @rcdev: reset controller
41  */
42 struct gdsc {
43 	struct generic_pm_domain	pd;
44 	struct regmap			*regmap;
45 	unsigned int			gdscr;
46 	unsigned int			*cxcs;
47 	unsigned int			cxc_count;
48 	const u8			pwrsts;
49 	struct reset_controller_dev	*rcdev;
50 	unsigned int			*resets;
51 	unsigned int			reset_count;
52 };
53 
54 #ifdef CONFIG_QCOM_GDSC
55 int gdsc_register(struct device *, struct gdsc **, size_t n,
56 		  struct reset_controller_dev *, struct regmap *);
57 void gdsc_unregister(struct device *);
58 #else
59 static inline int gdsc_register(struct device *d, struct gdsc **g, size_t n,
60 				struct reset_controller_dev *rcdev,
61 				struct regmap *r)
62 {
63 	return -ENOSYS;
64 }
65 
66 static inline void gdsc_unregister(struct device *d) {};
67 #endif /* CONFIG_QCOM_GDSC */
68 #endif /* __QCOM_GDSC_H__ */
69