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TOMOYO Linux Cross Reference
Linux/arch/arm/mach-omap2/clockdomain.h

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  1 /*
  2  * arch/arm/plat-omap/include/mach/clockdomain.h
  3  *
  4  * OMAP2/3 clockdomain framework functions
  5  *
  6  * Copyright (C) 2008 Texas Instruments, Inc.
  7  * Copyright (C) 2008-2011 Nokia Corporation
  8  *
  9  * Paul Walmsley
 10  *
 11  * This program is free software; you can redistribute it and/or modify
 12  * it under the terms of the GNU General Public License version 2 as
 13  * published by the Free Software Foundation.
 14  */
 15 
 16 #ifndef __ARCH_ARM_MACH_OMAP2_CLOCKDOMAIN_H
 17 #define __ARCH_ARM_MACH_OMAP2_CLOCKDOMAIN_H
 18 
 19 #include <linux/init.h>
 20 #include <linux/spinlock.h>
 21 
 22 #include "powerdomain.h"
 23 #include <plat/clock.h>
 24 #include <plat/omap_hwmod.h>
 25 #include <plat/cpu.h>
 26 
 27 /*
 28  * Clockdomain flags
 29  *
 30  * XXX Document CLKDM_CAN_* flags
 31  *
 32  * CLKDM_NO_AUTODEPS: Prevent "autodeps" from being added/removed from this
 33  *     clockdomain.  (Currently, this applies to OMAP3 clockdomains only.)
 34  * CLKDM_ACTIVE_WITH_MPU: The PRCM guarantees that this clockdomain is
 35  *     active whenever the MPU is active.  True for interconnects and
 36  *     the WKUP clockdomains.
 37  */
 38 #define CLKDM_CAN_FORCE_SLEEP                   (1 << 0)
 39 #define CLKDM_CAN_FORCE_WAKEUP                  (1 << 1)
 40 #define CLKDM_CAN_ENABLE_AUTO                   (1 << 2)
 41 #define CLKDM_CAN_DISABLE_AUTO                  (1 << 3)
 42 #define CLKDM_NO_AUTODEPS                       (1 << 4)
 43 #define CLKDM_ACTIVE_WITH_MPU                   (1 << 5)
 44 
 45 #define CLKDM_CAN_HWSUP         (CLKDM_CAN_ENABLE_AUTO | CLKDM_CAN_DISABLE_AUTO)
 46 #define CLKDM_CAN_SWSUP         (CLKDM_CAN_FORCE_SLEEP | CLKDM_CAN_FORCE_WAKEUP)
 47 #define CLKDM_CAN_HWSUP_SWSUP   (CLKDM_CAN_SWSUP | CLKDM_CAN_HWSUP)
 48 
 49 /**
 50  * struct clkdm_autodep - clkdm deps to add when entering/exiting hwsup mode
 51  * @clkdm: clockdomain to add wkdep+sleepdep on - set name member only
 52  *
 53  * A clockdomain that should have wkdeps and sleepdeps added when a
 54  * clockdomain should stay active in hwsup mode; and conversely,
 55  * removed when the clockdomain should be allowed to go inactive in
 56  * hwsup mode.
 57  *
 58  * Autodeps are deprecated and should be removed after
 59  * omap_hwmod-based fine-grained module idle control is added.
 60  */
 61 struct clkdm_autodep {
 62         union {
 63                 const char *name;
 64                 struct clockdomain *ptr;
 65         } clkdm;
 66 };
 67 
 68 /**
 69  * struct clkdm_dep - encode dependencies between clockdomains
 70  * @clkdm_name: clockdomain name
 71  * @clkdm: pointer to the struct clockdomain of @clkdm_name
 72  * @wkdep_usecount: Number of wakeup dependencies causing this clkdm to wake
 73  * @sleepdep_usecount: Number of sleep deps that could prevent clkdm from idle
 74  *
 75  * Statically defined.  @clkdm is resolved from @clkdm_name at runtime and
 76  * should not be pre-initialized.
 77  *
 78  * XXX Should also include hardware (fixed) dependencies.
 79  */
 80 struct clkdm_dep {
 81         const char *clkdm_name;
 82         struct clockdomain *clkdm;
 83         atomic_t wkdep_usecount;
 84         atomic_t sleepdep_usecount;
 85 };
 86 
 87 /* Possible flags for struct clockdomain._flags */
 88 #define _CLKDM_FLAG_HWSUP_ENABLED               BIT(0)
 89 
 90 /**
 91  * struct clockdomain - OMAP clockdomain
 92  * @name: clockdomain name
 93  * @pwrdm: powerdomain containing this clockdomain
 94  * @clktrctrl_reg: CLKSTCTRL reg for the given clock domain
 95  * @clktrctrl_mask: CLKTRCTRL/AUTOSTATE field mask in CM_CLKSTCTRL reg
 96  * @flags: Clockdomain capability flags
 97  * @_flags: Flags for use only by internal clockdomain code
 98  * @dep_bit: Bit shift of this clockdomain's PM_WKDEP/CM_SLEEPDEP bit
 99  * @prcm_partition: (OMAP4 only) PRCM partition ID for this clkdm's registers
100  * @cm_inst: (OMAP4 only) CM instance register offset
101  * @clkdm_offs: (OMAP4 only) CM clockdomain register offset
102  * @wkdep_srcs: Clockdomains that can be told to wake this powerdomain up
103  * @sleepdep_srcs: Clockdomains that can be told to keep this clkdm from inact
104  * @usecount: Usecount tracking
105  * @node: list_head to link all clockdomains together
106  *
107  * @prcm_partition should be a macro from mach-omap2/prcm44xx.h (OMAP4 only)
108  * @cm_inst should be a macro ending in _INST from the OMAP4 CM instance
109  *     definitions (OMAP4 only)
110  * @clkdm_offs should be a macro ending in _CDOFFS from the OMAP4 CM instance
111  *     definitions (OMAP4 only)
112  */
113 struct clockdomain {
114         const char *name;
115         union {
116                 const char *name;
117                 struct powerdomain *ptr;
118         } pwrdm;
119         const u16 clktrctrl_mask;
120         const u8 flags;
121         u8 _flags;
122         const u8 dep_bit;
123         const u8 prcm_partition;
124         const s16 cm_inst;
125         const u16 clkdm_offs;
126         struct clkdm_dep *wkdep_srcs;
127         struct clkdm_dep *sleepdep_srcs;
128         atomic_t usecount;
129         struct list_head node;
130         spinlock_t lock;
131 };
132 
133 /**
134  * struct clkdm_ops - Arch specific function implementations
135  * @clkdm_add_wkdep: Add a wakeup dependency between clk domains
136  * @clkdm_del_wkdep: Delete a wakeup dependency between clk domains
137  * @clkdm_read_wkdep: Read wakeup dependency state between clk domains
138  * @clkdm_clear_all_wkdeps: Remove all wakeup dependencies from the clk domain
139  * @clkdm_add_sleepdep: Add a sleep dependency between clk domains
140  * @clkdm_del_sleepdep: Delete a sleep dependency between clk domains
141  * @clkdm_read_sleepdep: Read sleep dependency state between clk domains
142  * @clkdm_clear_all_sleepdeps: Remove all sleep dependencies from the clk domain
143  * @clkdm_sleep: Force a clockdomain to sleep
144  * @clkdm_wakeup: Force a clockdomain to wakeup
145  * @clkdm_allow_idle: Enable hw supervised idle transitions for clock domain
146  * @clkdm_deny_idle: Disable hw supervised idle transitions for clock domain
147  * @clkdm_clk_enable: Put the clkdm in right state for a clock enable
148  * @clkdm_clk_disable: Put the clkdm in right state for a clock disable
149  */
150 struct clkdm_ops {
151         int     (*clkdm_add_wkdep)(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
152         int     (*clkdm_del_wkdep)(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
153         int     (*clkdm_read_wkdep)(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
154         int     (*clkdm_clear_all_wkdeps)(struct clockdomain *clkdm);
155         int     (*clkdm_add_sleepdep)(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
156         int     (*clkdm_del_sleepdep)(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
157         int     (*clkdm_read_sleepdep)(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
158         int     (*clkdm_clear_all_sleepdeps)(struct clockdomain *clkdm);
159         int     (*clkdm_sleep)(struct clockdomain *clkdm);
160         int     (*clkdm_wakeup)(struct clockdomain *clkdm);
161         void    (*clkdm_allow_idle)(struct clockdomain *clkdm);
162         void    (*clkdm_deny_idle)(struct clockdomain *clkdm);
163         int     (*clkdm_clk_enable)(struct clockdomain *clkdm);
164         int     (*clkdm_clk_disable)(struct clockdomain *clkdm);
165 };
166 
167 int clkdm_register_platform_funcs(struct clkdm_ops *co);
168 int clkdm_register_autodeps(struct clkdm_autodep *ia);
169 int clkdm_register_clkdms(struct clockdomain **c);
170 int clkdm_complete_init(void);
171 
172 struct clockdomain *clkdm_lookup(const char *name);
173 
174 int clkdm_for_each(int (*fn)(struct clockdomain *clkdm, void *user),
175                         void *user);
176 struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm);
177 
178 int clkdm_add_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
179 int clkdm_del_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
180 int clkdm_read_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
181 int clkdm_clear_all_wkdeps(struct clockdomain *clkdm);
182 int clkdm_add_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
183 int clkdm_del_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
184 int clkdm_read_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
185 int clkdm_clear_all_sleepdeps(struct clockdomain *clkdm);
186 
187 void clkdm_allow_idle(struct clockdomain *clkdm);
188 void clkdm_deny_idle(struct clockdomain *clkdm);
189 bool clkdm_in_hwsup(struct clockdomain *clkdm);
190 
191 int clkdm_wakeup(struct clockdomain *clkdm);
192 int clkdm_sleep(struct clockdomain *clkdm);
193 
194 int clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk);
195 int clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk);
196 int clkdm_hwmod_enable(struct clockdomain *clkdm, struct omap_hwmod *oh);
197 int clkdm_hwmod_disable(struct clockdomain *clkdm, struct omap_hwmod *oh);
198 
199 extern void __init omap242x_clockdomains_init(void);
200 extern void __init omap243x_clockdomains_init(void);
201 extern void __init omap3xxx_clockdomains_init(void);
202 extern void __init omap44xx_clockdomains_init(void);
203 extern void _clkdm_add_autodeps(struct clockdomain *clkdm);
204 extern void _clkdm_del_autodeps(struct clockdomain *clkdm);
205 
206 extern struct clkdm_ops omap2_clkdm_operations;
207 extern struct clkdm_ops omap3_clkdm_operations;
208 extern struct clkdm_ops omap4_clkdm_operations;
209 
210 extern struct clkdm_dep gfx_24xx_wkdeps[];
211 extern struct clkdm_dep dsp_24xx_wkdeps[];
212 extern struct clockdomain wkup_common_clkdm;
213 extern struct clockdomain prm_common_clkdm;
214 extern struct clockdomain cm_common_clkdm;
215 
216 #endif
217 

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