arch/arm/plat-omap/include/plat/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) 2008-2009 Nokia Corporation
   8  *
   9  * Written by 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 __ASM_ARM_ARCH_OMAP_CLOCKDOMAIN_H
  17 #define __ASM_ARM_ARCH_OMAP_CLOCKDOMAIN_H
  18
  19 #include <plat/powerdomain.h>
  20 #include <plat/clock.h>
  21 #include <plat/cpu.h>
  22
  23 /* Clockdomain capability flags */
  24 #define CLKDM_CAN_FORCE_SLEEP                   (1 << 0)
  25 #define CLKDM_CAN_FORCE_WAKEUP                  (1 << 1)
  26 #define CLKDM_CAN_ENABLE_AUTO                   (1 << 2)
  27 #define CLKDM_CAN_DISABLE_AUTO                  (1 << 3)
  28
  29 #define CLKDM_CAN_HWSUP         (CLKDM_CAN_ENABLE_AUTO | CLKDM_CAN_DISABLE_AUTO)
  30 #define CLKDM_CAN_SWSUP         (CLKDM_CAN_FORCE_SLEEP | CLKDM_CAN_FORCE_WAKEUP)
  31 #define CLKDM_CAN_HWSUP_SWSUP   (CLKDM_CAN_SWSUP | CLKDM_CAN_HWSUP)
  32
  33 /* OMAP24XX CM_CLKSTCTRL_*.AUTOSTATE_* register bit values */
  34 #define OMAP24XX_CLKSTCTRL_DISABLE_AUTO         0x0
  35 #define OMAP24XX_CLKSTCTRL_ENABLE_AUTO          0x1
  36
  37 /* OMAP3XXX CM_CLKSTCTRL_*.CLKTRCTRL_* register bit values */
  38 #define OMAP34XX_CLKSTCTRL_DISABLE_AUTO         0x0
  39 #define OMAP34XX_CLKSTCTRL_FORCE_SLEEP          0x1
  40 #define OMAP34XX_CLKSTCTRL_FORCE_WAKEUP         0x2
  41 #define OMAP34XX_CLKSTCTRL_ENABLE_AUTO          0x3
  42
  43 /**
  44  * struct clkdm_autodep - clkdm deps to add when entering/exiting hwsup mode
  45  * @clkdm: clockdomain to add wkdep+sleepdep on - set name member only
  46  * @omap_chip: OMAP chip types that this autodep is valid on
  47  *
  48  * A clockdomain that should have wkdeps and sleepdeps added when a
  49  * clockdomain should stay active in hwsup mode; and conversely,
  50  * removed when the clockdomain should be allowed to go inactive in
  51  * hwsup mode.
  52  *
  53  * Autodeps are deprecated and should be removed after
  54  * omap_hwmod-based fine-grained module idle control is added.
  55  */
  56 struct clkdm_autodep {
  57         union {
  58                 const char *name;
  59                 struct clockdomain *ptr;
  60         } clkdm;
  61         const struct omap_chip_id omap_chip;
  62 };
  63
  64 /**
  65  * struct clkdm_dep - encode dependencies between clockdomains
  66  * @clkdm_name: clockdomain name
  67  * @clkdm: pointer to the struct clockdomain of @clkdm_name
  68  * @omap_chip: OMAP chip types that this dependency is valid on
  69  * @wkdep_usecount: Number of wakeup dependencies causing this clkdm to wake
  70  * @sleepdep_usecount: Number of sleep deps that could prevent clkdm from idle
  71  *
  72  * Statically defined.  @clkdm is resolved from @clkdm_name at runtime and
  73  * should not be pre-initialized.
  74  *
  75  * XXX Should also include hardware (fixed) dependencies.
  76  */
  77 struct clkdm_dep {
  78         const char *clkdm_name;
  79         struct clockdomain *clkdm;
  80         atomic_t wkdep_usecount;
  81         atomic_t sleepdep_usecount;
  82         const struct omap_chip_id omap_chip;
  83 };
  84
  85 /**
  86  * struct clockdomain - OMAP clockdomain
  87  * @name: clockdomain name
  88  * @pwrdm: powerdomain containing this clockdomain
  89  * @clktrctrl_reg: CLKSTCTRL reg for the given clock domain
  90  * @clktrctrl_mask: CLKTRCTRL/AUTOSTATE field mask in CM_CLKSTCTRL reg
  91  * @flags: Clockdomain capability flags
  92  * @dep_bit: Bit shift of this clockdomain's PM_WKDEP/CM_SLEEPDEP bit
  93  * @wkdep_srcs: Clockdomains that can be told to wake this powerdomain up
  94  * @sleepdep_srcs: Clockdomains that can be told to keep this clkdm from inact
  95  * @omap_chip: OMAP chip types that this clockdomain is valid on
  96  * @usecount: Usecount tracking
  97  * @node: list_head to link all clockdomains together
  98  */
  99 struct clockdomain {
 100         const char *name;
 101         union {
 102                 const char *name;
 103                 struct powerdomain *ptr;
 104         } pwrdm;
 105         void __iomem *clkstctrl_reg;
 106         const u16 clktrctrl_mask;
 107         const u8 flags;
 108         const u8 dep_bit;
 109         struct clkdm_dep *wkdep_srcs;
 110         struct clkdm_dep *sleepdep_srcs;
 111         const struct omap_chip_id omap_chip;
 112         atomic_t usecount;
 113         struct list_head node;
 114 };
 115
 116 void clkdm_init(struct clockdomain **clkdms, struct clkdm_autodep *autodeps);
 117 struct clockdomain *clkdm_lookup(const char *name);
 118
 119 int clkdm_for_each(int (*fn)(struct clockdomain *clkdm, void *user),
 120                         void *user);
 121 struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm);
 122
 123 int clkdm_add_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 124 int clkdm_del_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 125 int clkdm_read_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 126 int clkdm_clear_all_wkdeps(struct clockdomain *clkdm);
 127 int clkdm_add_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 128 int clkdm_del_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 129 int clkdm_read_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 130 int clkdm_clear_all_sleepdeps(struct clockdomain *clkdm);
 131
 132 void omap2_clkdm_allow_idle(struct clockdomain *clkdm);
 133 void omap2_clkdm_deny_idle(struct clockdomain *clkdm);
 134
 135 int omap2_clkdm_wakeup(struct clockdomain *clkdm);
 136 int omap2_clkdm_sleep(struct clockdomain *clkdm);
 137
 138 int omap2_clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk);
 139 int omap2_clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk);
 140
 141 #endif