arch/arm/mach-omap2/clockdomain.h

   1 /*
   2  * OMAP2/3 clockdomain framework functions
   3  *
   4  * Copyright (C) 2008, 2012 Texas Instruments, Inc.
   5  * Copyright (C) 2008-2011 Nokia Corporation
   6  *
   7  * Paul Walmsley
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #ifndef __ARCH_ARM_MACH_OMAP2_CLOCKDOMAIN_H
  15 #define __ARCH_ARM_MACH_OMAP2_CLOCKDOMAIN_H
  16
  17 #include <linux/init.h>
  18 #include <linux/spinlock.h>
  19
  20 #include "powerdomain.h"
  21 #include <plat/clock.h>
  22 #include <plat/omap_hwmod.h>
  23 #include <plat/cpu.h>
  24
  25 /*
  26  * Clockdomain flags
  27  *
  28  * XXX Document CLKDM_CAN_* flags
  29  *
  30  * CLKDM_NO_AUTODEPS: Prevent "autodeps" from being added/removed from this
  31  *     clockdomain.  (Currently, this applies to OMAP3 clockdomains only.)
  32  * CLKDM_ACTIVE_WITH_MPU: The PRCM guarantees that this clockdomain is
  33  *     active whenever the MPU is active.  True for interconnects and
  34  *     the WKUP clockdomains.
  35  * CLKDM_MISSING_IDLE_REPORTING: The idle status of the IP blocks and
  36  *     clocks inside this clockdomain are not taken into account by
  37  *     the PRCM when determining whether the clockdomain is idle.
  38  *     Without this flag, if the clockdomain is set to
  39  *     hardware-supervised idle mode, the PRCM may transition the
  40  *     enclosing powerdomain to a low power state, even when devices
  41  *     inside the clockdomain and powerdomain are in use.  (An example
  42  *     of such a clockdomain is the EMU clockdomain on OMAP3/4.)  If
  43  *     this flag is set, and the clockdomain does not support the
  44  *     force-sleep mode, then the HW_AUTO mode will be used to put the
  45  *     clockdomain to sleep.  Similarly, if the clockdomain supports
  46  *     the force-wakeup mode, then it will be used whenever a clock or
  47  *     IP block inside the clockdomain is active, rather than the
  48  *     HW_AUTO mode.
  49  */
  50 #define CLKDM_CAN_FORCE_SLEEP                   (1 << 0)
  51 #define CLKDM_CAN_FORCE_WAKEUP                  (1 << 1)
  52 #define CLKDM_CAN_ENABLE_AUTO                   (1 << 2)
  53 #define CLKDM_CAN_DISABLE_AUTO                  (1 << 3)
  54 #define CLKDM_NO_AUTODEPS                       (1 << 4)
  55 #define CLKDM_ACTIVE_WITH_MPU                   (1 << 5)
  56 #define CLKDM_MISSING_IDLE_REPORTING            (1 << 6)
  57
  58 #define CLKDM_CAN_HWSUP         (CLKDM_CAN_ENABLE_AUTO | CLKDM_CAN_DISABLE_AUTO)
  59 #define CLKDM_CAN_SWSUP         (CLKDM_CAN_FORCE_SLEEP | CLKDM_CAN_FORCE_WAKEUP)
  60 #define CLKDM_CAN_HWSUP_SWSUP   (CLKDM_CAN_SWSUP | CLKDM_CAN_HWSUP)
  61
  62 /**
  63  * struct clkdm_autodep - clkdm deps to add when entering/exiting hwsup mode
  64  * @clkdm: clockdomain to add wkdep+sleepdep on - set name member only
  65  *
  66  * A clockdomain that should have wkdeps and sleepdeps added when a
  67  * clockdomain should stay active in hwsup mode; and conversely,
  68  * removed when the clockdomain should be allowed to go inactive in
  69  * hwsup mode.
  70  *
  71  * Autodeps are deprecated and should be removed after
  72  * omap_hwmod-based fine-grained module idle control is added.
  73  */
  74 struct clkdm_autodep {
  75         union {
  76                 const char *name;
  77                 struct clockdomain *ptr;
  78         } clkdm;
  79 };
  80
  81 /**
  82  * struct clkdm_dep - encode dependencies between clockdomains
  83  * @clkdm_name: clockdomain name
  84  * @clkdm: pointer to the struct clockdomain of @clkdm_name
  85  * @wkdep_usecount: Number of wakeup dependencies causing this clkdm to wake
  86  * @sleepdep_usecount: Number of sleep deps that could prevent clkdm from idle
  87  *
  88  * Statically defined.  @clkdm is resolved from @clkdm_name at runtime and
  89  * should not be pre-initialized.
  90  *
  91  * XXX Should also include hardware (fixed) dependencies.
  92  */
  93 struct clkdm_dep {
  94         const char *clkdm_name;
  95         struct clockdomain *clkdm;
  96         atomic_t wkdep_usecount;
  97         atomic_t sleepdep_usecount;
  98 };
  99
 100 /* Possible flags for struct clockdomain._flags */
 101 #define _CLKDM_FLAG_HWSUP_ENABLED               BIT(0)
 102
 103 /**
 104  * struct clockdomain - OMAP clockdomain
 105  * @name: clockdomain name
 106  * @pwrdm: powerdomain containing this clockdomain
 107  * @clktrctrl_reg: CLKSTCTRL reg for the given clock domain
 108  * @clktrctrl_mask: CLKTRCTRL/AUTOSTATE field mask in CM_CLKSTCTRL reg
 109  * @flags: Clockdomain capability flags
 110  * @_flags: Flags for use only by internal clockdomain code
 111  * @dep_bit: Bit shift of this clockdomain's PM_WKDEP/CM_SLEEPDEP bit
 112  * @prcm_partition: (OMAP4 only) PRCM partition ID for this clkdm's registers
 113  * @cm_inst: (OMAP4 only) CM instance register offset
 114  * @clkdm_offs: (OMAP4 only) CM clockdomain register offset
 115  * @wkdep_srcs: Clockdomains that can be told to wake this powerdomain up
 116  * @sleepdep_srcs: Clockdomains that can be told to keep this clkdm from inact
 117  * @usecount: Usecount tracking
 118  * @node: list_head to link all clockdomains together
 119  *
 120  * @prcm_partition should be a macro from mach-omap2/prcm44xx.h (OMAP4 only)
 121  * @cm_inst should be a macro ending in _INST from the OMAP4 CM instance
 122  *     definitions (OMAP4 only)
 123  * @clkdm_offs should be a macro ending in _CDOFFS from the OMAP4 CM instance
 124  *     definitions (OMAP4 only)
 125  */
 126 struct clockdomain {
 127         const char *name;
 128         union {
 129                 const char *name;
 130                 struct powerdomain *ptr;
 131         } pwrdm;
 132         const u16 clktrctrl_mask;
 133         const u8 flags;
 134         u8 _flags;
 135         const u8 dep_bit;
 136         const u8 prcm_partition;
 137         const s16 cm_inst;
 138         const u16 clkdm_offs;
 139         struct clkdm_dep *wkdep_srcs;
 140         struct clkdm_dep *sleepdep_srcs;
 141         atomic_t usecount;
 142         struct list_head node;
 143         spinlock_t lock;
 144 };
 145
 146 /**
 147  * struct clkdm_ops - Arch specific function implementations
 148  * @clkdm_add_wkdep: Add a wakeup dependency between clk domains
 149  * @clkdm_del_wkdep: Delete a wakeup dependency between clk domains
 150  * @clkdm_read_wkdep: Read wakeup dependency state between clk domains
 151  * @clkdm_clear_all_wkdeps: Remove all wakeup dependencies from the clk domain
 152  * @clkdm_add_sleepdep: Add a sleep dependency between clk domains
 153  * @clkdm_del_sleepdep: Delete a sleep dependency between clk domains
 154  * @clkdm_read_sleepdep: Read sleep dependency state between clk domains
 155  * @clkdm_clear_all_sleepdeps: Remove all sleep dependencies from the clk domain
 156  * @clkdm_sleep: Force a clockdomain to sleep
 157  * @clkdm_wakeup: Force a clockdomain to wakeup
 158  * @clkdm_allow_idle: Enable hw supervised idle transitions for clock domain
 159  * @clkdm_deny_idle: Disable hw supervised idle transitions for clock domain
 160  * @clkdm_clk_enable: Put the clkdm in right state for a clock enable
 161  * @clkdm_clk_disable: Put the clkdm in right state for a clock disable
 162  */
 163 struct clkdm_ops {
 164         int     (*clkdm_add_wkdep)(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 165         int     (*clkdm_del_wkdep)(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 166         int     (*clkdm_read_wkdep)(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 167         int     (*clkdm_clear_all_wkdeps)(struct clockdomain *clkdm);
 168         int     (*clkdm_add_sleepdep)(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 169         int     (*clkdm_del_sleepdep)(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 170         int     (*clkdm_read_sleepdep)(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 171         int     (*clkdm_clear_all_sleepdeps)(struct clockdomain *clkdm);
 172         int     (*clkdm_sleep)(struct clockdomain *clkdm);
 173         int     (*clkdm_wakeup)(struct clockdomain *clkdm);
 174         void    (*clkdm_allow_idle)(struct clockdomain *clkdm);
 175         void    (*clkdm_deny_idle)(struct clockdomain *clkdm);
 176         int     (*clkdm_clk_enable)(struct clockdomain *clkdm);
 177         int     (*clkdm_clk_disable)(struct clockdomain *clkdm);
 178 };
 179
 180 int clkdm_register_platform_funcs(struct clkdm_ops *co);
 181 int clkdm_register_autodeps(struct clkdm_autodep *ia);
 182 int clkdm_register_clkdms(struct clockdomain **c);
 183 int clkdm_complete_init(void);
 184
 185 struct clockdomain *clkdm_lookup(const char *name);
 186
 187 int clkdm_for_each(int (*fn)(struct clockdomain *clkdm, void *user),
 188                         void *user);
 189 struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm);
 190
 191 int clkdm_add_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 192 int clkdm_del_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 193 int clkdm_read_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 194 int clkdm_clear_all_wkdeps(struct clockdomain *clkdm);
 195 int clkdm_add_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 196 int clkdm_del_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 197 int clkdm_read_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 198 int clkdm_clear_all_sleepdeps(struct clockdomain *clkdm);
 199
 200 void clkdm_allow_idle(struct clockdomain *clkdm);
 201 void clkdm_deny_idle(struct clockdomain *clkdm);
 202 bool clkdm_in_hwsup(struct clockdomain *clkdm);
 203 bool clkdm_missing_idle_reporting(struct clockdomain *clkdm);
 204
 205 int clkdm_wakeup(struct clockdomain *clkdm);
 206 int clkdm_sleep(struct clockdomain *clkdm);
 207
 208 int clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk);
 209 int clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk);
 210 int clkdm_hwmod_enable(struct clockdomain *clkdm, struct omap_hwmod *oh);
 211 int clkdm_hwmod_disable(struct clockdomain *clkdm, struct omap_hwmod *oh);
 212
 213 extern void __init omap242x_clockdomains_init(void);
 214 extern void __init omap243x_clockdomains_init(void);
 215 extern void __init omap3xxx_clockdomains_init(void);
 216 extern void __init am33xx_clockdomains_init(void);
 217 extern void __init omap44xx_clockdomains_init(void);
 218 extern void _clkdm_add_autodeps(struct clockdomain *clkdm);
 219 extern void _clkdm_del_autodeps(struct clockdomain *clkdm);
 220
 221 extern struct clkdm_ops omap2_clkdm_operations;
 222 extern struct clkdm_ops omap3_clkdm_operations;
 223 extern struct clkdm_ops omap4_clkdm_operations;
 224 extern struct clkdm_ops am33xx_clkdm_operations;
 225
 226 extern struct clkdm_dep gfx_24xx_wkdeps[];
 227 extern struct clkdm_dep dsp_24xx_wkdeps[];
 228 extern struct clockdomain wkup_common_clkdm;
 229
 230 #endif