arch/arm/mach-omap2/clockdomain44xx.c

   1 /*
   2  * OMAP4 clockdomain control
   3  *
   4  * Copyright (C) 2008-2010 Texas Instruments, Inc.
   5  * Copyright (C) 2008-2010 Nokia Corporation
   6  *
   7  * Derived from mach-omap2/clockdomain.c written by Paul Walmsley
   8  * Rajendra Nayak <rnayak@ti.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include "clockdomain.h"
  17 #include "cminst44xx.h"
  18 #include "cm44xx.h"
  19
  20 static int omap4_clkdm_add_wkup_sleep_dep(struct clockdomain *clkdm1,
  21                                         struct clockdomain *clkdm2)
  22 {
  23         omap4_cminst_set_inst_reg_bits((1 << clkdm2->dep_bit),
  24                                         clkdm1->prcm_partition,
  25                                         clkdm1->cm_inst, clkdm1->clkdm_offs +
  26                                         OMAP4_CM_STATICDEP);
  27         return 0;
  28 }
  29
  30 static int omap4_clkdm_del_wkup_sleep_dep(struct clockdomain *clkdm1,
  31                                         struct clockdomain *clkdm2)
  32 {
  33         omap4_cminst_clear_inst_reg_bits((1 << clkdm2->dep_bit),
  34                                         clkdm1->prcm_partition,
  35                                         clkdm1->cm_inst, clkdm1->clkdm_offs +
  36                                         OMAP4_CM_STATICDEP);
  37         return 0;
  38 }
  39
  40 static int omap4_clkdm_read_wkup_sleep_dep(struct clockdomain *clkdm1,
  41                                         struct clockdomain *clkdm2)
  42 {
  43         return omap4_cminst_read_inst_reg_bits(clkdm1->prcm_partition,
  44                                         clkdm1->cm_inst, clkdm1->clkdm_offs +
  45                                         OMAP4_CM_STATICDEP,
  46                                         (1 << clkdm2->dep_bit));
  47 }
  48
  49 static int omap4_clkdm_clear_all_wkup_sleep_deps(struct clockdomain *clkdm)
  50 {
  51         struct clkdm_dep *cd;
  52         u32 mask = 0;
  53
  54         if (!clkdm->prcm_partition)
  55                 return 0;
  56
  57         for (cd = clkdm->wkdep_srcs; cd && cd->clkdm_name; cd++) {
  58                 if (!cd->clkdm)
  59                         continue; /* only happens if data is erroneous */
  60
  61                 mask |= 1 << cd->clkdm->dep_bit;
  62                 atomic_set(&cd->wkdep_usecount, 0);
  63         }
  64
  65         omap4_cminst_clear_inst_reg_bits(mask, clkdm->prcm_partition,
  66                                         clkdm->cm_inst, clkdm->clkdm_offs +
  67                                         OMAP4_CM_STATICDEP);
  68         return 0;
  69 }
  70
  71 static int omap4_clkdm_sleep(struct clockdomain *clkdm)
  72 {
  73         omap4_cminst_clkdm_enable_hwsup(clkdm->prcm_partition,
  74                                         clkdm->cm_inst, clkdm->clkdm_offs);
  75         return 0;
  76 }
  77
  78 static int omap4_clkdm_wakeup(struct clockdomain *clkdm)
  79 {
  80         omap4_cminst_clkdm_force_wakeup(clkdm->prcm_partition,
  81                                         clkdm->cm_inst, clkdm->clkdm_offs);
  82         return 0;
  83 }
  84
  85 static void omap4_clkdm_allow_idle(struct clockdomain *clkdm)
  86 {
  87         omap4_cminst_clkdm_enable_hwsup(clkdm->prcm_partition,
  88                                         clkdm->cm_inst, clkdm->clkdm_offs);
  89 }
  90
  91 static void omap4_clkdm_deny_idle(struct clockdomain *clkdm)
  92 {
  93         if (clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)
  94                 omap4_clkdm_wakeup(clkdm);
  95         else
  96                 omap4_cminst_clkdm_disable_hwsup(clkdm->prcm_partition,
  97                                                  clkdm->cm_inst,
  98                                                  clkdm->clkdm_offs);
  99 }
 100
 101 static int omap4_clkdm_clk_enable(struct clockdomain *clkdm)
 102 {
 103         if (clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)
 104                 return omap4_clkdm_wakeup(clkdm);
 105
 106         return 0;
 107 }
 108
 109 static int omap4_clkdm_clk_disable(struct clockdomain *clkdm)
 110 {
 111         bool hwsup = false;
 112
 113         if (!clkdm->prcm_partition)
 114                 return 0;
 115
 116         /*
 117          * The CLKDM_MISSING_IDLE_REPORTING flag documentation has
 118          * more details on the unpleasant problem this is working
 119          * around
 120          */
 121         if (clkdm->flags & CLKDM_MISSING_IDLE_REPORTING &&
 122             !(clkdm->flags & CLKDM_CAN_FORCE_SLEEP)) {
 123                 omap4_clkdm_allow_idle(clkdm);
 124                 return 0;
 125         }
 126
 127         hwsup = omap4_cminst_is_clkdm_in_hwsup(clkdm->prcm_partition,
 128                                         clkdm->cm_inst, clkdm->clkdm_offs);
 129
 130         if (!hwsup && (clkdm->flags & CLKDM_CAN_FORCE_SLEEP))
 131                 omap4_clkdm_sleep(clkdm);
 132
 133         return 0;
 134 }
 135
 136 struct clkdm_ops omap4_clkdm_operations = {
 137         .clkdm_add_wkdep        = omap4_clkdm_add_wkup_sleep_dep,
 138         .clkdm_del_wkdep        = omap4_clkdm_del_wkup_sleep_dep,
 139         .clkdm_read_wkdep       = omap4_clkdm_read_wkup_sleep_dep,
 140         .clkdm_clear_all_wkdeps = omap4_clkdm_clear_all_wkup_sleep_deps,
 141         .clkdm_add_sleepdep     = omap4_clkdm_add_wkup_sleep_dep,
 142         .clkdm_del_sleepdep     = omap4_clkdm_del_wkup_sleep_dep,
 143         .clkdm_read_sleepdep    = omap4_clkdm_read_wkup_sleep_dep,
 144         .clkdm_clear_all_sleepdeps      = omap4_clkdm_clear_all_wkup_sleep_deps,
 145         .clkdm_sleep            = omap4_clkdm_sleep,
 146         .clkdm_wakeup           = omap4_clkdm_wakeup,
 147         .clkdm_allow_idle       = omap4_clkdm_allow_idle,
 148         .clkdm_deny_idle        = omap4_clkdm_deny_idle,
 149         .clkdm_clk_enable       = omap4_clkdm_clk_enable,
 150         .clkdm_clk_disable      = omap4_clkdm_clk_disable,
 151 };