arch/arm/plat-omap/include/mach/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 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 <mach/powerdomain.h>
  20 #include <mach/clock.h>
  21 #include <mach/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_pwrdm_autodep - a powerdomain that should have wkdeps
  45  * and sleepdeps added when a powerdomain should stay active in hwsup mode;
  46  * and conversely, removed when the powerdomain should be allowed to go
  47  * inactive in hwsup mode.
  48  */
  49 struct clkdm_pwrdm_autodep {
  50
  51         union {
  52                 /* Name of the powerdomain to add a wkdep/sleepdep on */
  53                 const char *name;
  54
  55                 /* Powerdomain pointer (looked up at clkdm_init() time) */
  56                 struct powerdomain *ptr;
  57         } pwrdm;
  58
  59         /* OMAP chip types that this clockdomain dep is valid on */
  60         const struct omap_chip_id omap_chip;
  61
  62 };
  63
  64 struct clockdomain {
  65
  66         /* Clockdomain name */
  67         const char *name;
  68
  69         union {
  70                 /* Powerdomain enclosing this clockdomain */
  71                 const char *name;
  72
  73                 /* Powerdomain pointer assigned at clkdm_register() */
  74                 struct powerdomain *ptr;
  75         } pwrdm;
  76
  77         /* CLKTRCTRL/AUTOSTATE field mask in CM_CLKSTCTRL reg */
  78         const u16 clktrctrl_mask;
  79
  80         /* Clockdomain capability flags */
  81         const u8 flags;
  82
  83         /* OMAP chip types that this clockdomain is valid on */
  84         const struct omap_chip_id omap_chip;
  85
  86         /* Usecount tracking */
  87         atomic_t usecount;
  88
  89         struct list_head node;
  90
  91 };
  92
  93 void clkdm_init(struct clockdomain **clkdms, struct clkdm_pwrdm_autodep *autodeps);
  94 int clkdm_register(struct clockdomain *clkdm);
  95 int clkdm_unregister(struct clockdomain *clkdm);
  96 struct clockdomain *clkdm_lookup(const char *name);
  97
  98 int clkdm_for_each(int (*fn)(struct clockdomain *clkdm));
  99 struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm);
 100
 101 void omap2_clkdm_allow_idle(struct clockdomain *clkdm);
 102 void omap2_clkdm_deny_idle(struct clockdomain *clkdm);
 103
 104 int omap2_clkdm_wakeup(struct clockdomain *clkdm);
 105 int omap2_clkdm_sleep(struct clockdomain *clkdm);
 106
 107 int omap2_clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk);
 108 int omap2_clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk);
 109
 110 #endif