arch/arm/mach-omap2/clockdomain.h

   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  */
  35 #define CLKDM_CAN_FORCE_SLEEP                   (1 << 0)
  36 #define CLKDM_CAN_FORCE_WAKEUP                  (1 << 1)
  37 #define CLKDM_CAN_ENABLE_AUTO                   (1 << 2)
  38 #define CLKDM_CAN_DISABLE_AUTO                  (1 << 3)
  39 #define CLKDM_NO_AUTODEPS                       (1 << 4)
  40
  41 #define CLKDM_CAN_HWSUP         (CLKDM_CAN_ENABLE_AUTO | CLKDM_CAN_DISABLE_AUTO)
  42 #define CLKDM_CAN_SWSUP         (CLKDM_CAN_FORCE_SLEEP | CLKDM_CAN_FORCE_WAKEUP)
  43 #define CLKDM_CAN_HWSUP_SWSUP   (CLKDM_CAN_SWSUP | CLKDM_CAN_HWSUP)
  44
  45 /**
  46  * struct clkdm_autodep - clkdm deps to add when entering/exiting hwsup mode
  47  * @clkdm: clockdomain to add wkdep+sleepdep on - set name member only
  48  * @omap_chip: OMAP chip types that this autodep is valid on
  49  *
  50  * A clockdomain that should have wkdeps and sleepdeps added when a
  51  * clockdomain should stay active in hwsup mode; and conversely,
  52  * removed when the clockdomain should be allowed to go inactive in
  53  * hwsup mode.
  54  *
  55  * Autodeps are deprecated and should be removed after
  56  * omap_hwmod-based fine-grained module idle control is added.
  57  */
  58 struct clkdm_autodep {
  59         union {
  60                 const char *name;
  61                 struct clockdomain *ptr;
  62         } clkdm;
  63         const struct omap_chip_id omap_chip;
  64 };
  65
  66 /**
  67  * struct clkdm_dep - encode dependencies between clockdomains
  68  * @clkdm_name: clockdomain name
  69  * @clkdm: pointer to the struct clockdomain of @clkdm_name
  70  * @omap_chip: OMAP chip types that this dependency is valid on
  71  * @wkdep_usecount: Number of wakeup dependencies causing this clkdm to wake
  72  * @sleepdep_usecount: Number of sleep deps that could prevent clkdm from idle
  73  *
  74  * Statically defined.  @clkdm is resolved from @clkdm_name at runtime and
  75  * should not be pre-initialized.
  76  *
  77  * XXX Should also include hardware (fixed) dependencies.
  78  */
  79 struct clkdm_dep {
  80         const char *clkdm_name;
  81         struct clockdomain *clkdm;
  82         atomic_t wkdep_usecount;
  83         atomic_t sleepdep_usecount;
  84         const struct omap_chip_id omap_chip;
  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  * @omap_chip: OMAP chip types that this clockdomain is valid on
 105  * @usecount: Usecount tracking
 106  * @node: list_head to link all clockdomains together
 107  *
 108  * @prcm_partition should be a macro from mach-omap2/prcm44xx.h (OMAP4 only)
 109  * @cm_inst should be a macro ending in _INST from the OMAP4 CM instance
 110  *     definitions (OMAP4 only)
 111  * @clkdm_offs should be a macro ending in _CDOFFS from the OMAP4 CM instance
 112  *     definitions (OMAP4 only)
 113  */
 114 struct clockdomain {
 115         const char *name;
 116         union {
 117                 const char *name;
 118                 struct powerdomain *ptr;
 119         } pwrdm;
 120         const u16 clktrctrl_mask;
 121         const u8 flags;
 122         u8 _flags;
 123         const u8 dep_bit;
 124         const u8 prcm_partition;
 125         const s16 cm_inst;
 126         const u16 clkdm_offs;
 127         struct clkdm_dep *wkdep_srcs;
 128         struct clkdm_dep *sleepdep_srcs;
 129         const struct omap_chip_id omap_chip;
 130         atomic_t usecount;
 131         struct list_head node;
 132         spinlock_t lock;
 133 };
 134
 135 /**
 136  * struct clkdm_ops - Arch specific function implementations
 137  * @clkdm_add_wkdep: Add a wakeup dependency between clk domains
 138  * @clkdm_del_wkdep: Delete a wakeup dependency between clk domains
 139  * @clkdm_read_wkdep: Read wakeup dependency state between clk domains
 140  * @clkdm_clear_all_wkdeps: Remove all wakeup dependencies from the clk domain
 141  * @clkdm_add_sleepdep: Add a sleep dependency between clk domains
 142  * @clkdm_del_sleepdep: Delete a sleep dependency between clk domains
 143  * @clkdm_read_sleepdep: Read sleep dependency state between clk domains
 144  * @clkdm_clear_all_sleepdeps: Remove all sleep dependencies from the clk domain
 145  * @clkdm_sleep: Force a clockdomain to sleep
 146  * @clkdm_wakeup: Force a clockdomain to wakeup
 147  * @clkdm_allow_idle: Enable hw supervised idle transitions for clock domain
 148  * @clkdm_deny_idle: Disable hw supervised idle transitions for clock domain
 149  * @clkdm_clk_enable: Put the clkdm in right state for a clock enable
 150  * @clkdm_clk_disable: Put the clkdm in right state for a clock disable
 151  */
 152 struct clkdm_ops {
 153         int     (*clkdm_add_wkdep)(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 154         int     (*clkdm_del_wkdep)(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 155         int     (*clkdm_read_wkdep)(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 156         int     (*clkdm_clear_all_wkdeps)(struct clockdomain *clkdm);
 157         int     (*clkdm_add_sleepdep)(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 158         int     (*clkdm_del_sleepdep)(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 159         int     (*clkdm_read_sleepdep)(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 160         int     (*clkdm_clear_all_sleepdeps)(struct clockdomain *clkdm);
 161         int     (*clkdm_sleep)(struct clockdomain *clkdm);
 162         int     (*clkdm_wakeup)(struct clockdomain *clkdm);
 163         void    (*clkdm_allow_idle)(struct clockdomain *clkdm);
 164         void    (*clkdm_deny_idle)(struct clockdomain *clkdm);
 165         int     (*clkdm_clk_enable)(struct clockdomain *clkdm);
 166         int     (*clkdm_clk_disable)(struct clockdomain *clkdm);
 167 };
 168
 169 void clkdm_init(struct clockdomain **clkdms, struct clkdm_autodep *autodeps,
 170                         struct clkdm_ops *custom_funcs);
 171 struct clockdomain *clkdm_lookup(const char *name);
 172
 173 int clkdm_for_each(int (*fn)(struct clockdomain *clkdm, void *user),
 174                         void *user);
 175 struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm);
 176
 177 int clkdm_add_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 178 int clkdm_del_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 179 int clkdm_read_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 180 int clkdm_clear_all_wkdeps(struct clockdomain *clkdm);
 181 int clkdm_add_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 182 int clkdm_del_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 183 int clkdm_read_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 184 int clkdm_clear_all_sleepdeps(struct clockdomain *clkdm);
 185
 186 void clkdm_allow_idle(struct clockdomain *clkdm);
 187 void clkdm_deny_idle(struct clockdomain *clkdm);
 188 bool clkdm_in_hwsup(struct clockdomain *clkdm);
 189
 190 int clkdm_wakeup(struct clockdomain *clkdm);
 191 int clkdm_sleep(struct clockdomain *clkdm);
 192
 193 int clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk);
 194 int clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk);
 195 int clkdm_hwmod_enable(struct clockdomain *clkdm, struct omap_hwmod *oh);
 196 int clkdm_hwmod_disable(struct clockdomain *clkdm, struct omap_hwmod *oh);
 197
 198 extern void __init omap2xxx_clockdomains_init(void);
 199 extern void __init omap3xxx_clockdomains_init(void);
 200 extern void __init omap44xx_clockdomains_init(void);
 201 extern void _clkdm_add_autodeps(struct clockdomain *clkdm);
 202 extern void _clkdm_del_autodeps(struct clockdomain *clkdm);
 203
 204 extern struct clkdm_ops omap2_clkdm_operations;
 205 extern struct clkdm_ops omap3_clkdm_operations;
 206 extern struct clkdm_ops omap4_clkdm_operations;
 207
 208 #endif