1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * OMAP2/3/4 powerdomain control
4  *
5  * Copyright (C) 2007-2008, 2010 Texas Instruments, Inc.
6  * Copyright (C) 2007-2011 Nokia Corporation
7  *
8  * Paul Walmsley
9  *
10  * XXX This should be moved to the mach-omap2/ directory at the earliest
11  * opportunity.
12  */
13 
14 #ifndef __ARCH_ARM_MACH_OMAP2_POWERDOMAIN_H
15 #define __ARCH_ARM_MACH_OMAP2_POWERDOMAIN_H
16 
17 #include <linux/types.h>
18 #include <linux/list.h>
19 #include <linux/spinlock.h>
20 
21 /* Powerdomain basic power states */
22 #define PWRDM_POWER_OFF		0x0
23 #define PWRDM_POWER_RET		0x1
24 #define PWRDM_POWER_INACTIVE	0x2
25 #define PWRDM_POWER_ON		0x3
26 
27 #define PWRDM_MAX_PWRSTS	4
28 
29 /* Powerdomain allowable state bitfields */
30 #define PWRSTS_ON		(1 << PWRDM_POWER_ON)
31 #define PWRSTS_INACTIVE		(1 << PWRDM_POWER_INACTIVE)
32 #define PWRSTS_RET		(1 << PWRDM_POWER_RET)
33 #define PWRSTS_OFF		(1 << PWRDM_POWER_OFF)
34 
35 #define PWRSTS_OFF_ON		(PWRSTS_OFF | PWRSTS_ON)
36 #define PWRSTS_OFF_RET		(PWRSTS_OFF | PWRSTS_RET)
37 #define PWRSTS_RET_ON		(PWRSTS_RET | PWRSTS_ON)
38 #define PWRSTS_OFF_RET_ON	(PWRSTS_OFF_RET | PWRSTS_ON)
39 #define PWRSTS_INA_ON		(PWRSTS_INACTIVE | PWRSTS_ON)
40 
41 
42 /*
43  * Powerdomain flags (struct powerdomain.flags)
44  *
45  * PWRDM_HAS_HDWR_SAR - powerdomain has hardware save-and-restore support
46  *
47  * PWRDM_HAS_MPU_QUIRK - MPU pwr domain has MEM bank 0 bits in MEM
48  * bank 1 position. This is true for OMAP3430
49  *
50  * PWRDM_HAS_LOWPOWERSTATECHANGE - can transition from a sleep state
51  * to a lower sleep state without waking up the powerdomain
52  */
53 #define PWRDM_HAS_HDWR_SAR		BIT(0)
54 #define PWRDM_HAS_MPU_QUIRK		BIT(1)
55 #define PWRDM_HAS_LOWPOWERSTATECHANGE	BIT(2)
56 
57 /*
58  * Number of memory banks that are power-controllable.	On OMAP4430, the
59  * maximum is 5.
60  */
61 #define PWRDM_MAX_MEM_BANKS	5
62 
63 /*
64  * Maximum number of clockdomains that can be associated with a powerdomain.
65  * PER powerdomain on AM33XX is the worst case
66  */
67 #define PWRDM_MAX_CLKDMS	11
68 
69 /* XXX A completely arbitrary number. What is reasonable here? */
70 #define PWRDM_TRANSITION_BAILOUT 100000
71 
72 struct clockdomain;
73 struct powerdomain;
74 struct voltagedomain;
75 
76 /**
77  * struct powerdomain - OMAP powerdomain
78  * @name: Powerdomain name
79  * @voltdm: voltagedomain containing this powerdomain
80  * @prcm_offs: the address offset from CM_BASE/PRM_BASE
81  * @prcm_partition: (OMAP4 only) the PRCM partition ID containing @prcm_offs
82  * @pwrsts: Possible powerdomain power states
83  * @pwrsts_logic_ret: Possible logic power states when pwrdm in RETENTION
84  * @flags: Powerdomain flags
85  * @banks: Number of software-controllable memory banks in this powerdomain
86  * @pwrsts_mem_ret: Possible memory bank pwrstates when pwrdm in RETENTION
87  * @pwrsts_mem_on: Possible memory bank pwrstates when pwrdm in ON
88  * @pwrdm_clkdms: Clockdomains in this powerdomain
89  * @node: list_head linking all powerdomains
90  * @voltdm_node: list_head linking all powerdomains in a voltagedomain
91  * @pwrstctrl_offs: (AM33XX only) XXX_PWRSTCTRL reg offset from prcm_offs
92  * @pwrstst_offs: (AM33XX only) XXX_PWRSTST reg offset from prcm_offs
93  * @logicretstate_mask: (AM33XX only) mask for logic retention bitfield
94  *	in @pwrstctrl_offs
95  * @mem_on_mask: (AM33XX only) mask for mem on bitfield in @pwrstctrl_offs
96  * @mem_ret_mask: (AM33XX only) mask for mem ret bitfield in @pwrstctrl_offs
97  * @mem_pwrst_mask: (AM33XX only) mask for mem state bitfield in @pwrstst_offs
98  * @mem_retst_mask: (AM33XX only) mask for mem retention state bitfield
99  *	in @pwrstctrl_offs
100  * @state:
101  * @state_counter:
102  * @timer:
103  * @state_timer:
104  * @_lock: spinlock used to serialize powerdomain and some clockdomain ops
105  * @_lock_flags: stored flags when @_lock is taken
106  *
107  * @prcm_partition possible values are defined in mach-omap2/prcm44xx.h.
108  */
109 struct powerdomain {
110 	const char *name;
111 	union {
112 		const char *name;
113 		struct voltagedomain *ptr;
114 	} voltdm;
115 	const s16 prcm_offs;
116 	const u8 pwrsts;
117 	const u8 pwrsts_logic_ret;
118 	const u8 flags;
119 	const u8 banks;
120 	const u8 pwrsts_mem_ret[PWRDM_MAX_MEM_BANKS];
121 	const u8 pwrsts_mem_on[PWRDM_MAX_MEM_BANKS];
122 	const u8 prcm_partition;
123 	struct clockdomain *pwrdm_clkdms[PWRDM_MAX_CLKDMS];
124 	struct list_head node;
125 	struct list_head voltdm_node;
126 	int state;
127 	unsigned state_counter[PWRDM_MAX_PWRSTS];
128 	unsigned ret_logic_off_counter;
129 	unsigned ret_mem_off_counter[PWRDM_MAX_MEM_BANKS];
130 	spinlock_t _lock;
131 	unsigned long _lock_flags;
132 	const u8 pwrstctrl_offs;
133 	const u8 pwrstst_offs;
134 	const u32 logicretstate_mask;
135 	const u32 mem_on_mask[PWRDM_MAX_MEM_BANKS];
136 	const u32 mem_ret_mask[PWRDM_MAX_MEM_BANKS];
137 	const u32 mem_pwrst_mask[PWRDM_MAX_MEM_BANKS];
138 	const u32 mem_retst_mask[PWRDM_MAX_MEM_BANKS];
139 
140 #ifdef CONFIG_PM_DEBUG
141 	s64 timer;
142 	s64 state_timer[PWRDM_MAX_PWRSTS];
143 #endif
144 	u32 context;
145 };
146 
147 /**
148  * struct pwrdm_ops - Arch specific function implementations
149  * @pwrdm_set_next_pwrst: Set the target power state for a pd
150  * @pwrdm_read_next_pwrst: Read the target power state set for a pd
151  * @pwrdm_read_pwrst: Read the current power state of a pd
152  * @pwrdm_read_prev_pwrst: Read the prev power state entered by the pd
153  * @pwrdm_set_logic_retst: Set the logic state in RET for a pd
154  * @pwrdm_set_mem_onst: Set the Memory state in ON for a pd
155  * @pwrdm_set_mem_retst: Set the Memory state in RET for a pd
156  * @pwrdm_read_logic_pwrst: Read the current logic state of a pd
157  * @pwrdm_read_prev_logic_pwrst: Read the previous logic state entered by a pd
158  * @pwrdm_read_logic_retst: Read the logic state in RET for a pd
159  * @pwrdm_read_mem_pwrst: Read the current memory state of a pd
160  * @pwrdm_read_prev_mem_pwrst: Read the previous memory state entered by a pd
161  * @pwrdm_read_mem_retst: Read the memory state in RET for a pd
162  * @pwrdm_clear_all_prev_pwrst: Clear all previous power states logged for a pd
163  * @pwrdm_enable_hdwr_sar: Enable Hardware Save-Restore feature for the pd
164  * @pwrdm_disable_hdwr_sar: Disable Hardware Save-Restore feature for a pd
165  * @pwrdm_set_lowpwrstchange: Enable pd transitions from a shallow to deep sleep
166  * @pwrdm_wait_transition: Wait for a pd state transition to complete
167  * @pwrdm_has_voltdm: Check if a voltdm association is needed
168  *
169  * Regarding @pwrdm_set_lowpwrstchange: On the OMAP2 and 3-family
170  * chips, a powerdomain's power state is not allowed to directly
171  * transition from one low-power state (e.g., CSWR) to another
172  * low-power state (e.g., OFF) without first waking up the
173  * powerdomain.  This wastes energy.  So OMAP4 chips support the
174  * ability to transition a powerdomain power state directly from one
175  * low-power state to another.  The function pointed to by
176  * @pwrdm_set_lowpwrstchange is intended to configure the OMAP4
177  * hardware powerdomain state machine to enable this feature.
178  */
179 struct pwrdm_ops {
180 	int	(*pwrdm_set_next_pwrst)(struct powerdomain *pwrdm, u8 pwrst);
181 	int	(*pwrdm_read_next_pwrst)(struct powerdomain *pwrdm);
182 	int	(*pwrdm_read_pwrst)(struct powerdomain *pwrdm);
183 	int	(*pwrdm_read_prev_pwrst)(struct powerdomain *pwrdm);
184 	int	(*pwrdm_set_logic_retst)(struct powerdomain *pwrdm, u8 pwrst);
185 	int	(*pwrdm_set_mem_onst)(struct powerdomain *pwrdm, u8 bank, u8 pwrst);
186 	int	(*pwrdm_set_mem_retst)(struct powerdomain *pwrdm, u8 bank, u8 pwrst);
187 	int	(*pwrdm_read_logic_pwrst)(struct powerdomain *pwrdm);
188 	int	(*pwrdm_read_prev_logic_pwrst)(struct powerdomain *pwrdm);
189 	int	(*pwrdm_read_logic_retst)(struct powerdomain *pwrdm);
190 	int	(*pwrdm_read_mem_pwrst)(struct powerdomain *pwrdm, u8 bank);
191 	int	(*pwrdm_read_prev_mem_pwrst)(struct powerdomain *pwrdm, u8 bank);
192 	int	(*pwrdm_read_mem_retst)(struct powerdomain *pwrdm, u8 bank);
193 	int	(*pwrdm_clear_all_prev_pwrst)(struct powerdomain *pwrdm);
194 	int	(*pwrdm_enable_hdwr_sar)(struct powerdomain *pwrdm);
195 	int	(*pwrdm_disable_hdwr_sar)(struct powerdomain *pwrdm);
196 	int	(*pwrdm_set_lowpwrstchange)(struct powerdomain *pwrdm);
197 	int	(*pwrdm_wait_transition)(struct powerdomain *pwrdm);
198 	int	(*pwrdm_has_voltdm)(void);
199 	void	(*pwrdm_save_context)(struct powerdomain *pwrdm);
200 	void	(*pwrdm_restore_context)(struct powerdomain *pwrdm);
201 };
202 
203 int pwrdm_register_platform_funcs(struct pwrdm_ops *custom_funcs);
204 int pwrdm_register_pwrdms(struct powerdomain **pwrdm_list);
205 int pwrdm_complete_init(void);
206 
207 struct powerdomain *pwrdm_lookup(const char *name);
208 
209 int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user),
210 			void *user);
211 int pwrdm_for_each_nolock(int (*fn)(struct powerdomain *pwrdm, void *user),
212 			void *user);
213 
214 int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm);
215 
216 int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm);
217 
218 u8 pwrdm_get_valid_lp_state(struct powerdomain *pwrdm,
219 			    bool is_logic_state, u8 req_state);
220 
221 int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst);
222 int pwrdm_read_next_pwrst(struct powerdomain *pwrdm);
223 int pwrdm_read_pwrst(struct powerdomain *pwrdm);
224 int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm);
225 int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm);
226 
227 int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst);
228 int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst);
229 int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst);
230 
231 int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm);
232 int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm);
233 int pwrdm_read_logic_retst(struct powerdomain *pwrdm);
234 int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank);
235 int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank);
236 int pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank);
237 
238 int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm);
239 int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm);
240 bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm);
241 
242 int pwrdm_state_switch_nolock(struct powerdomain *pwrdm);
243 int pwrdm_state_switch(struct powerdomain *pwrdm);
244 int pwrdm_pre_transition(struct powerdomain *pwrdm);
245 int pwrdm_post_transition(struct powerdomain *pwrdm);
246 int pwrdm_get_context_loss_count(struct powerdomain *pwrdm);
247 bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm);
248 
249 extern int omap_set_pwrdm_state(struct powerdomain *pwrdm, u8 state);
250 
251 extern void omap242x_powerdomains_init(void);
252 extern void omap243x_powerdomains_init(void);
253 extern void omap3xxx_powerdomains_init(void);
254 extern void am33xx_powerdomains_init(void);
255 extern void omap44xx_powerdomains_init(void);
256 extern void omap54xx_powerdomains_init(void);
257 extern void dra7xx_powerdomains_init(void);
258 void am43xx_powerdomains_init(void);
259 
260 extern struct pwrdm_ops omap2_pwrdm_operations;
261 extern struct pwrdm_ops omap3_pwrdm_operations;
262 extern struct pwrdm_ops am33xx_pwrdm_operations;
263 extern struct pwrdm_ops omap4_pwrdm_operations;
264 
265 /* Common Internal functions used across OMAP rev's */
266 extern u32 omap2_pwrdm_get_mem_bank_onstate_mask(u8 bank);
267 extern u32 omap2_pwrdm_get_mem_bank_retst_mask(u8 bank);
268 extern u32 omap2_pwrdm_get_mem_bank_stst_mask(u8 bank);
269 
270 extern struct powerdomain wkup_omap2_pwrdm;
271 extern struct powerdomain gfx_omap2_pwrdm;
272 
273 extern void pwrdm_lock(struct powerdomain *pwrdm);
274 extern void pwrdm_unlock(struct powerdomain *pwrdm);
275 
276 extern void pwrdms_save_context(void);
277 extern void pwrdms_restore_context(void);
278 
279 extern void pwrdms_lost_power(void);
280 #endif
281