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) 2008-2010 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
  21 #include "powerdomain.h"
  22 #include <plat/clock.h>
  23 #include <plat/cpu.h>
  24
  25 /* Clockdomain capability flags */
  26 #define CLKDM_CAN_FORCE_SLEEP                   (1 << 0)
  27 #define CLKDM_CAN_FORCE_WAKEUP                  (1 << 1)
  28 #define CLKDM_CAN_ENABLE_AUTO                   (1 << 2)
  29 #define CLKDM_CAN_DISABLE_AUTO                  (1 << 3)
  30
  31 #define CLKDM_CAN_HWSUP         (CLKDM_CAN_ENABLE_AUTO | CLKDM_CAN_DISABLE_AUTO)
  32 #define CLKDM_CAN_SWSUP         (CLKDM_CAN_FORCE_SLEEP | CLKDM_CAN_FORCE_WAKEUP)
  33 #define CLKDM_CAN_HWSUP_SWSUP   (CLKDM_CAN_SWSUP | CLKDM_CAN_HWSUP)
  34
  35 /**
  36  * struct clkdm_autodep - clkdm deps to add when entering/exiting hwsup mode
  37  * @clkdm: clockdomain to add wkdep+sleepdep on - set name member only
  38  * @omap_chip: OMAP chip types that this autodep is valid on
  39  *
  40  * A clockdomain that should have wkdeps and sleepdeps added when a
  41  * clockdomain should stay active in hwsup mode; and conversely,
  42  * removed when the clockdomain should be allowed to go inactive in
  43  * hwsup mode.
  44  *
  45  * Autodeps are deprecated and should be removed after
  46  * omap_hwmod-based fine-grained module idle control is added.
  47  */
  48 struct clkdm_autodep {
  49         union {
  50                 const char *name;
  51                 struct clockdomain *ptr;
  52         } clkdm;
  53         const struct omap_chip_id omap_chip;
  54 };
  55
  56 /**
  57  * struct clkdm_dep - encode dependencies between clockdomains
  58  * @clkdm_name: clockdomain name
  59  * @clkdm: pointer to the struct clockdomain of @clkdm_name
  60  * @omap_chip: OMAP chip types that this dependency is valid on
  61  * @wkdep_usecount: Number of wakeup dependencies causing this clkdm to wake
  62  * @sleepdep_usecount: Number of sleep deps that could prevent clkdm from idle
  63  *
  64  * Statically defined.  @clkdm is resolved from @clkdm_name at runtime and
  65  * should not be pre-initialized.
  66  *
  67  * XXX Should also include hardware (fixed) dependencies.
  68  */
  69 struct clkdm_dep {
  70         const char *clkdm_name;
  71         struct clockdomain *clkdm;
  72         atomic_t wkdep_usecount;
  73         atomic_t sleepdep_usecount;
  74         const struct omap_chip_id omap_chip;
  75 };
  76
  77 /**
  78  * struct clockdomain - OMAP clockdomain
  79  * @name: clockdomain name
  80  * @pwrdm: powerdomain containing this clockdomain
  81  * @clktrctrl_reg: CLKSTCTRL reg for the given clock domain
  82  * @clktrctrl_mask: CLKTRCTRL/AUTOSTATE field mask in CM_CLKSTCTRL reg
  83  * @flags: Clockdomain capability flags
  84  * @dep_bit: Bit shift of this clockdomain's PM_WKDEP/CM_SLEEPDEP bit
  85  * @prcm_partition: (OMAP4 only) PRCM partition ID for this clkdm's registers
  86  * @cm_inst: (OMAP4 only) CM instance register offset
  87  * @clkdm_offs: (OMAP4 only) CM clockdomain register offset
  88  * @wkdep_srcs: Clockdomains that can be told to wake this powerdomain up
  89  * @sleepdep_srcs: Clockdomains that can be told to keep this clkdm from inact
  90  * @omap_chip: OMAP chip types that this clockdomain is valid on
  91  * @usecount: Usecount tracking
  92  * @node: list_head to link all clockdomains together
  93  *
  94  * @prcm_partition should be a macro from mach-omap2/prcm44xx.h (OMAP4 only)
  95  * @cm_inst should be a macro ending in _INST from the OMAP4 CM instance
  96  *     definitions (OMAP4 only)
  97  * @clkdm_offs should be a macro ending in _CDOFFS from the OMAP4 CM instance
  98  *     definitions (OMAP4 only)
  99  */
 100 struct clockdomain {
 101         const char *name;
 102         union {
 103                 const char *name;
 104                 struct powerdomain *ptr;
 105         } pwrdm;
 106         const u16 clktrctrl_mask;
 107         const u8 flags;
 108         const u8 dep_bit;
 109         const u8 prcm_partition;
 110         const s16 cm_inst;
 111         const u16 clkdm_offs;
 112         struct clkdm_dep *wkdep_srcs;
 113         struct clkdm_dep *sleepdep_srcs;
 114         const struct omap_chip_id omap_chip;
 115         atomic_t usecount;
 116         struct list_head node;
 117 };
 118
 119 void clkdm_init(struct clockdomain **clkdms, struct clkdm_autodep *autodeps);
 120 struct clockdomain *clkdm_lookup(const char *name);
 121
 122 int clkdm_for_each(int (*fn)(struct clockdomain *clkdm, void *user),
 123                         void *user);
 124 struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm);
 125
 126 int clkdm_add_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 127 int clkdm_del_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 128 int clkdm_read_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 129 int clkdm_clear_all_wkdeps(struct clockdomain *clkdm);
 130 int clkdm_add_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 131 int clkdm_del_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 132 int clkdm_read_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 133 int clkdm_clear_all_sleepdeps(struct clockdomain *clkdm);
 134
 135 void omap2_clkdm_allow_idle(struct clockdomain *clkdm);
 136 void omap2_clkdm_deny_idle(struct clockdomain *clkdm);
 137
 138 int omap2_clkdm_wakeup(struct clockdomain *clkdm);
 139 int omap2_clkdm_sleep(struct clockdomain *clkdm);
 140
 141 int omap2_clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk);
 142 int omap2_clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk);
 143
 144 extern void __init omap2_clockdomains_init(void);
 145 extern void __init omap44xx_clockdomains_init(void);
 146
 147 #endif