xref: /linux/drivers/clk/qcom/gdsc.h (revision c532de5a67a70f8533d495f8f2aaa9a0491c3ad0)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (c) 2015, 2017-2018, 2022, The Linux Foundation. All rights reserved.
4  */
5 
6 #ifndef __QCOM_GDSC_H__
7 #define __QCOM_GDSC_H__
8 
9 #include <linux/err.h>
10 #include <linux/pm_domain.h>
11 
12 struct regmap;
13 struct regulator;
14 struct reset_controller_dev;
15 
16 /**
17  * struct gdsc - Globally Distributed Switch Controller
18  * @pd: generic power domain
19  * @regmap: regmap for MMIO accesses
20  * @gdscr: gsdc control register
21  * @collapse_ctrl: APCS collapse-vote register
22  * @collapse_mask: APCS collapse-vote mask
23  * @gds_hw_ctrl: gds_hw_ctrl register
24  * @cxcs: offsets of branch registers to toggle mem/periph bits in
25  * @cxc_count: number of @cxcs
26  * @pwrsts: Possible powerdomain power states
27  * @en_rest_wait_val: transition delay value for receiving enr ack signal
28  * @en_few_wait_val: transition delay value for receiving enf ack signal
29  * @clk_dis_wait_val: transition delay value for halting clock
30  * @resets: ids of resets associated with this gdsc
31  * @reset_count: number of @resets
32  * @rcdev: reset controller
33  */
34 struct gdsc {
35 	struct generic_pm_domain	pd;
36 	struct generic_pm_domain	*parent;
37 	struct regmap			*regmap;
38 	unsigned int			gdscr;
39 	unsigned int			collapse_ctrl;
40 	unsigned int			collapse_mask;
41 	unsigned int			gds_hw_ctrl;
42 	unsigned int			clamp_io_ctrl;
43 	unsigned int			*cxcs;
44 	unsigned int			cxc_count;
45 	unsigned int			en_rest_wait_val;
46 	unsigned int			en_few_wait_val;
47 	unsigned int			clk_dis_wait_val;
48 	const u8			pwrsts;
49 /* Powerdomain allowable state bitfields */
50 #define PWRSTS_OFF		BIT(0)
51 /*
52  * There is no SW control to transition a GDSC into
53  * PWRSTS_RET. This happens in HW when the parent
54  * domain goes down to a low power state
55  */
56 #define PWRSTS_RET		BIT(1)
57 #define PWRSTS_ON		BIT(2)
58 #define PWRSTS_OFF_ON		(PWRSTS_OFF | PWRSTS_ON)
59 #define PWRSTS_RET_ON		(PWRSTS_RET | PWRSTS_ON)
60 	const u16			flags;
61 #define VOTABLE		BIT(0)
62 #define CLAMP_IO	BIT(1)
63 #define HW_CTRL		BIT(2)
64 #define SW_RESET	BIT(3)
65 #define AON_RESET	BIT(4)
66 #define POLL_CFG_GDSCR	BIT(5)
67 #define ALWAYS_ON	BIT(6)
68 #define RETAIN_FF_ENABLE	BIT(7)
69 #define NO_RET_PERIPH	BIT(8)
70 #define HW_CTRL_TRIGGER	BIT(9)
71 	struct reset_controller_dev	*rcdev;
72 	unsigned int			*resets;
73 	unsigned int			reset_count;
74 
75 	const char 			*supply;
76 	struct regulator		*rsupply;
77 };
78 
79 struct gdsc_desc {
80 	struct device *dev;
81 	struct gdsc **scs;
82 	size_t num;
83 };
84 
85 #ifdef CONFIG_QCOM_GDSC
86 int gdsc_register(struct gdsc_desc *desc, struct reset_controller_dev *,
87 		  struct regmap *);
88 void gdsc_unregister(struct gdsc_desc *desc);
89 int gdsc_gx_do_nothing_enable(struct generic_pm_domain *domain);
90 #else
91 static inline int gdsc_register(struct gdsc_desc *desc,
92 				struct reset_controller_dev *rcdev,
93 				struct regmap *r)
94 {
95 	return -ENOSYS;
96 }
97 
98 static inline void gdsc_unregister(struct gdsc_desc *desc) {};
99 #endif /* CONFIG_QCOM_GDSC */
100 #endif /* __QCOM_GDSC_H__ */
101