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 <plat/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 pwrst)
  76 {
  77         u8 curr_pwrst, next_pwrst;
  78         int sleep_switch = -1, ret = 0, hwsup = 0;
  79
  80         if (!pwrdm || IS_ERR(pwrdm))
  81                 return -EINVAL;
  82
  83         while (!(pwrdm->pwrsts & (1 << pwrst))) {
  84                 if (pwrst == PWRDM_POWER_OFF)
  85                         return ret;
  86                 pwrst--;
  87         }
  88
  89         next_pwrst = pwrdm_read_next_pwrst(pwrdm);
  90         if (next_pwrst == pwrst)
  91                 return ret;
  92
  93         curr_pwrst = pwrdm_read_pwrst(pwrdm);
  94         if (curr_pwrst < PWRDM_POWER_ON) {
  95                 if ((curr_pwrst > pwrst) &&
  96                         (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
  97                         sleep_switch = LOWPOWERSTATE_SWITCH;
  98                 } else {
  99                         hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
 100                         clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
 101                         sleep_switch = FORCEWAKEUP_SWITCH;
 102                 }
 103         }
 104
 105         ret = pwrdm_set_next_pwrst(pwrdm, pwrst);
 106         if (ret)
 107                 pr_err("%s: unable to set power state of powerdomain: %s\n",
 108                        __func__, pwrdm->name);
 109
 110         switch (sleep_switch) {
 111         case FORCEWAKEUP_SWITCH:
 112                 if (hwsup)
 113                         clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
 114                 else
 115                         clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
 116                 break;
 117         case LOWPOWERSTATE_SWITCH:
 118                 pwrdm_set_lowpwrstchange(pwrdm);
 119                 pwrdm_wait_transition(pwrdm);
 120                 pwrdm_state_switch(pwrdm);
 121                 break;
 122         }
 123
 124         return ret;
 125 }
 126
 127 /*
 128  * This API is to be called during init to set the various voltage
 129  * domains to the voltage as per the opp table. Typically we boot up
 130  * at the nominal voltage. So this function finds out the rate of
 131  * the clock associated with the voltage domain, finds out the correct
 132  * opp entry and sets the voltage domain to the voltage specified
 133  * in the opp entry
 134  */
 135 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
 136                                          const char *oh_name)
 137 {
 138         struct voltagedomain *voltdm;
 139         struct clk *clk;
 140         struct opp *opp;
 141         unsigned long freq, bootup_volt;
 142         struct device *dev;
 143
 144         if (!vdd_name || !clk_name || !oh_name) {
 145                 pr_err("%s: invalid parameters\n", __func__);
 146                 goto exit;
 147         }
 148
 149         dev = omap_device_get_by_hwmod_name(oh_name);
 150         if (IS_ERR(dev)) {
 151                 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
 152                         __func__, oh_name);
 153                 goto exit;
 154         }
 155
 156         voltdm = voltdm_lookup(vdd_name);
 157         if (IS_ERR(voltdm)) {
 158                 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
 159                         __func__, vdd_name);
 160                 goto exit;
 161         }
 162
 163         clk =  clk_get(NULL, clk_name);
 164         if (IS_ERR(clk)) {
 165                 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
 166                 goto exit;
 167         }
 168
 169         freq = clk->rate;
 170         clk_put(clk);
 171
 172         rcu_read_lock();
 173         opp = opp_find_freq_ceil(dev, &freq);
 174         if (IS_ERR(opp)) {
 175                 rcu_read_unlock();
 176                 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
 177                         __func__, vdd_name);
 178                 goto exit;
 179         }
 180
 181         bootup_volt = opp_get_voltage(opp);
 182         rcu_read_unlock();
 183         if (!bootup_volt) {
 184                 pr_err("%s: unable to find voltage corresponding "
 185                         "to the bootup OPP for vdd_%s\n", __func__, vdd_name);
 186                 goto exit;
 187         }
 188
 189         voltdm_scale(voltdm, bootup_volt);
 190         return 0;
 191
 192 exit:
 193         pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
 194         return -EINVAL;
 195 }
 196
 197 static void __init omap3_init_voltages(void)
 198 {
 199         if (!cpu_is_omap34xx())
 200                 return;
 201
 202         omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
 203         omap2_set_init_voltage("core", "l3_ick", "l3_main");
 204 }
 205
 206 static void __init omap4_init_voltages(void)
 207 {
 208         if (!cpu_is_omap44xx())
 209                 return;
 210
 211         omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
 212         omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
 213         omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
 214 }
 215
 216 static int __init omap2_common_pm_init(void)
 217 {
 218         if (!of_have_populated_dt())
 219                 omap2_init_processor_devices();
 220         omap_pm_if_init();
 221
 222         return 0;
 223 }
 224 postcore_initcall(omap2_common_pm_init);
 225
 226 static int __init omap2_common_pm_late_init(void)
 227 {
 228         /* Init the voltage layer */
 229         omap_pmic_late_init();
 230         omap_voltage_late_init();
 231
 232         /* Initialize the voltages */
 233         omap3_init_voltages();
 234         omap4_init_voltages();
 235
 236         /* Smartreflex device init */
 237         omap_devinit_smartreflex();
 238
 239         return 0;
 240 }
 241 late_initcall(omap2_common_pm_late_init);