arch/arm/mach-omap2/pm.c

   1 /*
   2  * pm.c - Common OMAP2+ power management-related code
   3  *
   4  * Copyright (C) 2010 Texas Instruments, Inc.
   5  * Copyright (C) 2010 Nokia Corporation
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/io.h>
  15 #include <linux/err.h>
  16 #include <linux/opp.h>
  17 #include <linux/export.h>
  18
  19 #include <plat/omap-pm.h>
  20 #include <plat/omap_device.h>
  21 #include "common.h"
  22
  23 #include "voltage.h"
  24 #include "powerdomain.h"
  25 #include "clockdomain.h"
  26 #include "pm.h"
  27 #include "twl-common.h"
  28
  29 static struct omap_device_pm_latency *pm_lats;
  30
  31 static int _init_omap_device(char *name)
  32 {
  33         struct omap_hwmod *oh;
  34         struct platform_device *pdev;
  35
  36         oh = omap_hwmod_lookup(name);
  37         if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
  38                  __func__, name))
  39                 return -ENODEV;
  40
  41         pdev = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
  42         if (WARN(IS_ERR(pdev), "%s: could not build omap_device for %s\n",
  43                  __func__, name))
  44                 return -ENODEV;
  45
  46         return 0;
  47 }
  48
  49 /*
  50  * Build omap_devices for processors and bus.
  51  */
  52 static void omap2_init_processor_devices(void)
  53 {
  54         _init_omap_device("mpu");
  55         if (omap3_has_iva())
  56                 _init_omap_device("iva");
  57
  58         if (cpu_is_omap44xx()) {
  59                 _init_omap_device("l3_main_1");
  60                 _init_omap_device("dsp");
  61                 _init_omap_device("iva");
  62         } else {
  63                 _init_omap_device("l3_main");
  64         }
  65 }
  66
  67 /* Types of sleep_switch used in omap_set_pwrdm_state */
  68 #define FORCEWAKEUP_SWITCH      0
  69 #define LOWPOWERSTATE_SWITCH    1
  70
  71 /*
  72  * This sets pwrdm state (other than mpu & core. Currently only ON &
  73  * RET are supported.
  74  */
  75 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
  76 {
  77         u32 cur_state;
  78         int sleep_switch = -1;
  79         int ret = 0;
  80         int hwsup = 0;
  81
  82         if (pwrdm == NULL || IS_ERR(pwrdm))
  83                 return -EINVAL;
  84
  85         while (!(pwrdm->pwrsts & (1 << state))) {
  86                 if (state == PWRDM_POWER_OFF)
  87                         return ret;
  88                 state--;
  89         }
  90
  91         cur_state = pwrdm_read_next_pwrst(pwrdm);
  92         if (cur_state == state)
  93                 return ret;
  94
  95         if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
  96                 if ((pwrdm_read_pwrst(pwrdm) > state) &&
  97                         (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
  98                         sleep_switch = LOWPOWERSTATE_SWITCH;
  99                 } else {
 100                         hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
 101                         clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
 102                         sleep_switch = FORCEWAKEUP_SWITCH;
 103                 }
 104         }
 105
 106         ret = pwrdm_set_next_pwrst(pwrdm, state);
 107         if (ret) {
 108                 pr_err("%s: unable to set state of powerdomain: %s\n",
 109                        __func__, pwrdm->name);
 110                 goto err;
 111         }
 112
 113         switch (sleep_switch) {
 114         case FORCEWAKEUP_SWITCH:
 115                 if (hwsup)
 116                         clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
 117                 else
 118                         clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
 119                 break;
 120         case LOWPOWERSTATE_SWITCH:
 121                 pwrdm_set_lowpwrstchange(pwrdm);
 122                 break;
 123         default:
 124                 return ret;
 125         }
 126
 127         pwrdm_state_switch(pwrdm);
 128 err:
 129         return ret;
 130 }
 131
 132 /*
 133  * This API is to be called during init to set the various voltage
 134  * domains to the voltage as per the opp table. Typically we boot up
 135  * at the nominal voltage. So this function finds out the rate of
 136  * the clock associated with the voltage domain, finds out the correct
 137  * opp entry and sets the voltage domain to the voltage specified
 138  * in the opp entry
 139  */
 140 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
 141                                          const char *oh_name)
 142 {
 143         struct voltagedomain *voltdm;
 144         struct clk *clk;
 145         struct opp *opp;
 146         unsigned long freq, bootup_volt;
 147         struct device *dev;
 148
 149         if (!vdd_name || !clk_name || !oh_name) {
 150                 pr_err("%s: invalid parameters\n", __func__);
 151                 goto exit;
 152         }
 153
 154         dev = omap_device_get_by_hwmod_name(oh_name);
 155         if (IS_ERR(dev)) {
 156                 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
 157                         __func__, oh_name);
 158                 goto exit;
 159         }
 160
 161         voltdm = voltdm_lookup(vdd_name);
 162         if (IS_ERR(voltdm)) {
 163                 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
 164                         __func__, vdd_name);
 165                 goto exit;
 166         }
 167
 168         clk =  clk_get(NULL, clk_name);
 169         if (IS_ERR(clk)) {
 170                 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
 171                 goto exit;
 172         }
 173
 174         freq = clk->rate;
 175         clk_put(clk);
 176
 177         rcu_read_lock();
 178         opp = opp_find_freq_ceil(dev, &freq);
 179         if (IS_ERR(opp)) {
 180                 rcu_read_unlock();
 181                 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
 182                         __func__, vdd_name);
 183                 goto exit;
 184         }
 185
 186         bootup_volt = opp_get_voltage(opp);
 187         rcu_read_unlock();
 188         if (!bootup_volt) {
 189                 pr_err("%s: unable to find voltage corresponding "
 190                         "to the bootup OPP for vdd_%s\n", __func__, vdd_name);
 191                 goto exit;
 192         }
 193
 194         voltdm_scale(voltdm, bootup_volt);
 195         return 0;
 196
 197 exit:
 198         pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
 199         return -EINVAL;
 200 }
 201
 202 static void __init omap3_init_voltages(void)
 203 {
 204         if (!cpu_is_omap34xx())
 205                 return;
 206
 207         omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
 208         omap2_set_init_voltage("core", "l3_ick", "l3_main");
 209 }
 210
 211 static void __init omap4_init_voltages(void)
 212 {
 213         if (!cpu_is_omap44xx())
 214                 return;
 215
 216         omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
 217         omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
 218         omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
 219 }
 220
 221 static int __init omap2_common_pm_init(void)
 222 {
 223         if (!of_have_populated_dt())
 224                 omap2_init_processor_devices();
 225         omap_pm_if_init();
 226
 227         return 0;
 228 }
 229 postcore_initcall(omap2_common_pm_init);
 230
 231 static int __init omap2_common_pm_late_init(void)
 232 {
 233         /* Init the voltage layer */
 234         omap_pmic_late_init();
 235         omap_voltage_late_init();
 236
 237         /* Initialize the voltages */
 238         omap3_init_voltages();
 239         omap4_init_voltages();
 240
 241         /* Smartreflex device init */
 242         omap_devinit_smartreflex();
 243
 244         return 0;
 245 }
 246 late_initcall(omap2_common_pm_late_init);