arch/arm/plat-omap/include/mach/clockdomain.h

   1 /*
   2  * linux/include/asm-arm/arch-omap/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         /* Name of the powerdomain to add a wkdep/sleepdep on */
  52         const char *pwrdm_name;
  53
  54         /* Powerdomain pointer (looked up at clkdm_init() time) */
  55         struct powerdomain *pwrdm;
  56
  57         /* OMAP chip types that this clockdomain dep is valid on */
  58         const struct omap_chip_id omap_chip;
  59
  60 };
  61
  62 struct clockdomain {
  63
  64         /* Clockdomain name */
  65         const char *name;
  66
  67         /* Powerdomain enclosing this clockdomain */
  68         const char *pwrdm_name;
  69
  70         /* CLKTRCTRL/AUTOSTATE field mask in CM_CLKSTCTRL reg */
  71         const u16 clktrctrl_mask;
  72
  73         /* Clockdomain capability flags */
  74         const u8 flags;
  75
  76         /* OMAP chip types that this clockdomain is valid on */
  77         const struct omap_chip_id omap_chip;
  78
  79         /* Usecount tracking */
  80         atomic_t usecount;
  81
  82         /* Powerdomain pointer assigned at clkdm_register() */
  83         struct powerdomain *pwrdm;
  84
  85         struct list_head node;
  86
  87 };
  88
  89 void clkdm_init(struct clockdomain **clkdms, struct clkdm_pwrdm_autodep *autodeps);
  90 int clkdm_register(struct clockdomain *clkdm);
  91 int clkdm_unregister(struct clockdomain *clkdm);
  92 struct clockdomain *clkdm_lookup(const char *name);
  93
  94 int clkdm_for_each(int (*fn)(struct clockdomain *clkdm));
  95 struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm);
  96
  97 void omap2_clkdm_allow_idle(struct clockdomain *clkdm);
  98 void omap2_clkdm_deny_idle(struct clockdomain *clkdm);
  99
 100 int omap2_clkdm_wakeup(struct clockdomain *clkdm);
 101 int omap2_clkdm_sleep(struct clockdomain *clkdm);
 102
 103 int omap2_clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk);
 104 int omap2_clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk);
 105
 106 #endif