arch/arm/mach-omap2/powerdomain2xxx_3xxx.c

   1 /*
   2  * OMAP2 and OMAP3 powerdomain control
   3  *
   4  * Copyright (C) 2009-2010 Texas Instruments, Inc.
   5  * Copyright (C) 2007-2009 Nokia Corporation
   6  *
   7  * Derived from mach-omap2/powerdomain.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/io.h>
  16 #include <linux/errno.h>
  17 #include <linux/delay.h>
  18
  19 #include <plat/prcm.h>
  20
  21 #include "powerdomain.h"
  22 #include "prm.h"
  23 #include "prm-regbits-24xx.h"
  24 #include "prm-regbits-34xx.h"
  25
  26
  27 /* Common functions across OMAP2 and OMAP3 */
  28 static int omap2_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
  29 {
  30         omap2_prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK,
  31                                 (pwrst << OMAP_POWERSTATE_SHIFT),
  32                                 pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL);
  33         return 0;
  34 }
  35
  36 static int omap2_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
  37 {
  38         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
  39                                              OMAP2_PM_PWSTCTRL,
  40                                              OMAP_POWERSTATE_MASK);
  41 }
  42
  43 static int omap2_pwrdm_read_pwrst(struct powerdomain *pwrdm)
  44 {
  45         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
  46                                              OMAP2_PM_PWSTST,
  47                                              OMAP_POWERSTATEST_MASK);
  48 }
  49
  50 static int omap2_pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank,
  51                                                                 u8 pwrst)
  52 {
  53         u32 m;
  54
  55         m = omap2_pwrdm_get_mem_bank_onstate_mask(bank);
  56
  57         omap2_prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs,
  58                                    OMAP2_PM_PWSTCTRL);
  59
  60         return 0;
  61 }
  62
  63 static int omap2_pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank,
  64                                                                 u8 pwrst)
  65 {
  66         u32 m;
  67
  68         m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
  69
  70         omap2_prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs,
  71                                    OMAP2_PM_PWSTCTRL);
  72
  73         return 0;
  74 }
  75
  76 static int omap2_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
  77 {
  78         u32 m;
  79
  80         m = omap2_pwrdm_get_mem_bank_stst_mask(bank);
  81
  82         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP2_PM_PWSTST,
  83                                              m);
  84 }
  85
  86 static int omap2_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
  87 {
  88         u32 m;
  89
  90         m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
  91
  92         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
  93                                              OMAP2_PM_PWSTCTRL, m);
  94 }
  95
  96 static int omap2_pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
  97 {
  98         u32 v;
  99
 100         v = pwrst << __ffs(OMAP3430_LOGICL1CACHERETSTATE_MASK);
 101         omap2_prm_rmw_mod_reg_bits(OMAP3430_LOGICL1CACHERETSTATE_MASK, v,
 102                                    pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL);
 103
 104         return 0;
 105 }
 106
 107 static int omap2_pwrdm_wait_transition(struct powerdomain *pwrdm)
 108 {
 109         u32 c = 0;
 110
 111         /*
 112          * REVISIT: pwrdm_wait_transition() may be better implemented
 113          * via a callback and a periodic timer check -- how long do we expect
 114          * powerdomain transitions to take?
 115          */
 116
 117         /* XXX Is this udelay() value meaningful? */
 118         while ((omap2_prm_read_mod_reg(pwrdm->prcm_offs, OMAP2_PM_PWSTST) &
 119                 OMAP_INTRANSITION_MASK) &&
 120                 (c++ < PWRDM_TRANSITION_BAILOUT))
 121                         udelay(1);
 122
 123         if (c > PWRDM_TRANSITION_BAILOUT) {
 124                 printk(KERN_ERR "powerdomain: waited too long for "
 125                         "powerdomain %s to complete transition\n", pwrdm->name);
 126                 return -EAGAIN;
 127         }
 128
 129         pr_debug("powerdomain: completed transition in %d loops\n", c);
 130
 131         return 0;
 132 }
 133
 134 /* Applicable only for OMAP3. Not supported on OMAP2 */
 135 static int omap3_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
 136 {
 137         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 138                                              OMAP3430_PM_PREPWSTST,
 139                                              OMAP3430_LASTPOWERSTATEENTERED_MASK);
 140 }
 141
 142 static int omap3_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
 143 {
 144         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 145                                              OMAP2_PM_PWSTST,
 146                                              OMAP3430_LOGICSTATEST_MASK);
 147 }
 148
 149 static int omap3_pwrdm_read_logic_retst(struct powerdomain *pwrdm)
 150 {
 151         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 152                                              OMAP2_PM_PWSTCTRL,
 153                                              OMAP3430_LOGICSTATEST_MASK);
 154 }
 155
 156 static int omap3_pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
 157 {
 158         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 159                                              OMAP3430_PM_PREPWSTST,
 160                                              OMAP3430_LASTLOGICSTATEENTERED_MASK);
 161 }
 162
 163 static int omap3_get_mem_bank_lastmemst_mask(u8 bank)
 164 {
 165         switch (bank) {
 166         case 0:
 167                 return OMAP3430_LASTMEM1STATEENTERED_MASK;
 168         case 1:
 169                 return OMAP3430_LASTMEM2STATEENTERED_MASK;
 170         case 2:
 171                 return OMAP3430_LASTSHAREDL2CACHEFLATSTATEENTERED_MASK;
 172         case 3:
 173                 return OMAP3430_LASTL2FLATMEMSTATEENTERED_MASK;
 174         default:
 175                 WARN_ON(1); /* should never happen */
 176                 return -EEXIST;
 177         }
 178         return 0;
 179 }
 180
 181 static int omap3_pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
 182 {
 183         u32 m;
 184
 185         m = omap3_get_mem_bank_lastmemst_mask(bank);
 186
 187         return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 188                                 OMAP3430_PM_PREPWSTST, m);
 189 }
 190
 191 static int omap3_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
 192 {
 193         omap2_prm_write_mod_reg(0, pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST);
 194         return 0;
 195 }
 196
 197 static int omap3_pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm)
 198 {
 199         return omap2_prm_rmw_mod_reg_bits(0,
 200                                           1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT,
 201                                           pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL);
 202 }
 203
 204 static int omap3_pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm)
 205 {
 206         return omap2_prm_rmw_mod_reg_bits(1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT,
 207                                           0, pwrdm->prcm_offs,
 208                                           OMAP2_PM_PWSTCTRL);
 209 }
 210
 211 struct pwrdm_ops omap2_pwrdm_operations = {
 212         .pwrdm_set_next_pwrst   = omap2_pwrdm_set_next_pwrst,
 213         .pwrdm_read_next_pwrst  = omap2_pwrdm_read_next_pwrst,
 214         .pwrdm_read_pwrst       = omap2_pwrdm_read_pwrst,
 215         .pwrdm_set_logic_retst  = omap2_pwrdm_set_logic_retst,
 216         .pwrdm_set_mem_onst     = omap2_pwrdm_set_mem_onst,
 217         .pwrdm_set_mem_retst    = omap2_pwrdm_set_mem_retst,
 218         .pwrdm_read_mem_pwrst   = omap2_pwrdm_read_mem_pwrst,
 219         .pwrdm_read_mem_retst   = omap2_pwrdm_read_mem_retst,
 220         .pwrdm_wait_transition  = omap2_pwrdm_wait_transition,
 221 };
 222
 223 struct pwrdm_ops omap3_pwrdm_operations = {
 224         .pwrdm_set_next_pwrst   = omap2_pwrdm_set_next_pwrst,
 225         .pwrdm_read_next_pwrst  = omap2_pwrdm_read_next_pwrst,
 226         .pwrdm_read_pwrst       = omap2_pwrdm_read_pwrst,
 227         .pwrdm_read_prev_pwrst  = omap3_pwrdm_read_prev_pwrst,
 228         .pwrdm_set_logic_retst  = omap2_pwrdm_set_logic_retst,
 229         .pwrdm_read_logic_pwrst = omap3_pwrdm_read_logic_pwrst,
 230         .pwrdm_read_logic_retst = omap3_pwrdm_read_logic_retst,
 231         .pwrdm_read_prev_logic_pwrst    = omap3_pwrdm_read_prev_logic_pwrst,
 232         .pwrdm_set_mem_onst     = omap2_pwrdm_set_mem_onst,
 233         .pwrdm_set_mem_retst    = omap2_pwrdm_set_mem_retst,
 234         .pwrdm_read_mem_pwrst   = omap2_pwrdm_read_mem_pwrst,
 235         .pwrdm_read_mem_retst   = omap2_pwrdm_read_mem_retst,
 236         .pwrdm_read_prev_mem_pwrst      = omap3_pwrdm_read_prev_mem_pwrst,
 237         .pwrdm_clear_all_prev_pwrst     = omap3_pwrdm_clear_all_prev_pwrst,
 238         .pwrdm_enable_hdwr_sar  = omap3_pwrdm_enable_hdwr_sar,
 239         .pwrdm_disable_hdwr_sar = omap3_pwrdm_disable_hdwr_sar,
 240         .pwrdm_wait_transition  = omap2_pwrdm_wait_transition,
 241 };