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 _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 int __init omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
  72 {
  73         if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
  74                 clkdm_allow_idle(clkdm);
  75         else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
  76                  atomic_read(&clkdm->usecount) == 0)
  77                 clkdm_sleep(clkdm);
  78         return 0;
  79 }
  80
  81 /*
  82  * This sets pwrdm state (other than mpu & core. Currently only ON &
  83  * RET are supported.
  84  */
  85 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 pwrst)
  86 {
  87         u8 curr_pwrst, next_pwrst;
  88         int sleep_switch = -1, ret = 0, hwsup = 0;
  89
  90         if (!pwrdm || IS_ERR(pwrdm))
  91                 return -EINVAL;
  92
  93         while (!(pwrdm->pwrsts & (1 << pwrst))) {
  94                 if (pwrst == PWRDM_POWER_OFF)
  95                         return ret;
  96                 pwrst--;
  97         }
  98
  99         next_pwrst = pwrdm_read_next_pwrst(pwrdm);
 100         if (next_pwrst == pwrst)
 101                 return ret;
 102
 103         curr_pwrst = pwrdm_read_pwrst(pwrdm);
 104         if (curr_pwrst < PWRDM_POWER_ON) {
 105                 if ((curr_pwrst > pwrst) &&
 106                         (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
 107                         sleep_switch = LOWPOWERSTATE_SWITCH;
 108                 } else {
 109                         hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
 110                         clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
 111                         sleep_switch = FORCEWAKEUP_SWITCH;
 112                 }
 113         }
 114
 115         ret = pwrdm_set_next_pwrst(pwrdm, pwrst);
 116         if (ret)
 117                 pr_err("%s: unable to set power state of powerdomain: %s\n",
 118                        __func__, pwrdm->name);
 119
 120         switch (sleep_switch) {
 121         case FORCEWAKEUP_SWITCH:
 122                 if (hwsup)
 123                         clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
 124                 else
 125                         clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
 126                 break;
 127         case LOWPOWERSTATE_SWITCH:
 128                 pwrdm_set_lowpwrstchange(pwrdm);
 129                 pwrdm_wait_transition(pwrdm);
 130                 pwrdm_state_switch(pwrdm);
 131                 break;
 132         }
 133
 134         return ret;
 135 }
 136
 137 /*
 138  * This API is to be called during init to set the various voltage
 139  * domains to the voltage as per the opp table. Typically we boot up
 140  * at the nominal voltage. So this function finds out the rate of
 141  * the clock associated with the voltage domain, finds out the correct
 142  * opp entry and sets the voltage domain to the voltage specified
 143  * in the opp entry
 144  */
 145 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
 146                                          const char *oh_name)
 147 {
 148         struct voltagedomain *voltdm;
 149         struct clk *clk;
 150         struct opp *opp;
 151         unsigned long freq, bootup_volt;
 152         struct device *dev;
 153
 154         if (!vdd_name || !clk_name || !oh_name) {
 155                 pr_err("%s: invalid parameters\n", __func__);
 156                 goto exit;
 157         }
 158
 159         dev = omap_device_get_by_hwmod_name(oh_name);
 160         if (IS_ERR(dev)) {
 161                 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
 162                         __func__, oh_name);
 163                 goto exit;
 164         }
 165
 166         voltdm = voltdm_lookup(vdd_name);
 167         if (IS_ERR(voltdm)) {
 168                 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
 169                         __func__, vdd_name);
 170                 goto exit;
 171         }
 172
 173         clk =  clk_get(NULL, clk_name);
 174         if (IS_ERR(clk)) {
 175                 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
 176                 goto exit;
 177         }
 178
 179         freq = clk->rate;
 180         clk_put(clk);
 181
 182         opp = opp_find_freq_ceil(dev, &freq);
 183         if (IS_ERR(opp)) {
 184                 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
 185                         __func__, vdd_name);
 186                 goto exit;
 187         }
 188
 189         bootup_volt = opp_get_voltage(opp);
 190         if (!bootup_volt) {
 191                 pr_err("%s: unable to find voltage corresponding "
 192                         "to the bootup OPP for vdd_%s\n", __func__, vdd_name);
 193                 goto exit;
 194         }
 195
 196         voltdm_scale(voltdm, bootup_volt);
 197         return 0;
 198
 199 exit:
 200         pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
 201         return -EINVAL;
 202 }
 203
 204 static void __init omap3_init_voltages(void)
 205 {
 206         if (!cpu_is_omap34xx())
 207                 return;
 208
 209         omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
 210         omap2_set_init_voltage("core", "l3_ick", "l3_main");
 211 }
 212
 213 static void __init omap4_init_voltages(void)
 214 {
 215         if (!cpu_is_omap44xx())
 216                 return;
 217
 218         omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
 219         omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
 220         omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
 221 }
 222
 223 static int __init omap2_common_pm_init(void)
 224 {
 225         if (!of_have_populated_dt())
 226                 omap2_init_processor_devices();
 227         omap_pm_if_init();
 228
 229         return 0;
 230 }
 231 postcore_initcall(omap2_common_pm_init);
 232
 233 static int __init omap2_common_pm_late_init(void)
 234 {
 235         /* Init the voltage layer */
 236         omap_pmic_late_init();
 237         omap_voltage_late_init();
 238
 239         /* Initialize the voltages */
 240         omap3_init_voltages();
 241         omap4_init_voltages();
 242
 243         /* Smartreflex device init */
 244         omap_devinit_smartreflex();
 245
 246         return 0;
 247 }
 248 late_initcall(omap2_common_pm_late_init);