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
  18 #include <plat/omap-pm.h>
  19 #include <plat/omap_device.h>
  20 #include <plat/common.h>
  21 #include <plat/voltage.h>
  22
  23 #include "powerdomain.h"
  24 #include "clockdomain.h"
  25 #include "pm.h"
  26
  27 static struct omap_device_pm_latency *pm_lats;
  28
  29 static struct device *mpu_dev;
  30 static struct device *iva_dev;
  31 static struct device *l3_dev;
  32 static struct device *dsp_dev;
  33
  34 struct device *omap2_get_mpuss_device(void)
  35 {
  36         WARN_ON_ONCE(!mpu_dev);
  37         return mpu_dev;
  38 }
  39
  40 struct device *omap2_get_iva_device(void)
  41 {
  42         WARN_ON_ONCE(!iva_dev);
  43         return iva_dev;
  44 }
  45
  46 struct device *omap2_get_l3_device(void)
  47 {
  48         WARN_ON_ONCE(!l3_dev);
  49         return l3_dev;
  50 }
  51
  52 struct device *omap4_get_dsp_device(void)
  53 {
  54         WARN_ON_ONCE(!dsp_dev);
  55         return dsp_dev;
  56 }
  57 EXPORT_SYMBOL(omap4_get_dsp_device);
  58
  59 /* static int _init_omap_device(struct omap_hwmod *oh, void *user) */
  60 static int _init_omap_device(char *name, struct device **new_dev)
  61 {
  62         struct omap_hwmod *oh;
  63         struct omap_device *od;
  64
  65         oh = omap_hwmod_lookup(name);
  66         if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
  67                  __func__, name))
  68                 return -ENODEV;
  69
  70         od = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
  71         if (WARN(IS_ERR(od), "%s: could not build omap_device for %s\n",
  72                  __func__, name))
  73                 return -ENODEV;
  74
  75         *new_dev = &od->pdev.dev;
  76
  77         return 0;
  78 }
  79
  80 /*
  81  * Build omap_devices for processors and bus.
  82  */
  83 static void omap2_init_processor_devices(void)
  84 {
  85         _init_omap_device("mpu", &mpu_dev);
  86         _init_omap_device("iva", &iva_dev);
  87         if (cpu_is_omap44xx()) {
  88                 _init_omap_device("l3_main_1", &l3_dev);
  89                 _init_omap_device("dsp", &dsp_dev);
  90         } else {
  91                 _init_omap_device("l3_main", &l3_dev);
  92         }
  93 }
  94
  95 /* Types of sleep_switch used in omap_set_pwrdm_state */
  96 #define FORCEWAKEUP_SWITCH      0
  97 #define LOWPOWERSTATE_SWITCH    1
  98
  99 /*
 100  * This sets pwrdm state (other than mpu & core. Currently only ON &
 101  * RET are supported.
 102  */
 103 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
 104 {
 105         u32 cur_state;
 106         int sleep_switch = 0;
 107         int ret = 0;
 108
 109         if (pwrdm == NULL || IS_ERR(pwrdm))
 110                 return -EINVAL;
 111
 112         while (!(pwrdm->pwrsts & (1 << state))) {
 113                 if (state == PWRDM_POWER_OFF)
 114                         return ret;
 115                 state--;
 116         }
 117
 118         cur_state = pwrdm_read_next_pwrst(pwrdm);
 119         if (cur_state == state)
 120                 return ret;
 121
 122         if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
 123                 if ((pwrdm_read_pwrst(pwrdm) > state) &&
 124                         (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
 125                         sleep_switch = LOWPOWERSTATE_SWITCH;
 126                 } else {
 127                         omap2_clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
 128                         pwrdm_wait_transition(pwrdm);
 129                         sleep_switch = FORCEWAKEUP_SWITCH;
 130                 }
 131         }
 132
 133         ret = pwrdm_set_next_pwrst(pwrdm, state);
 134         if (ret) {
 135                 printk(KERN_ERR "Unable to set state of powerdomain: %s\n",
 136                        pwrdm->name);
 137                 goto err;
 138         }
 139
 140         switch (sleep_switch) {
 141         case FORCEWAKEUP_SWITCH:
 142                 if (pwrdm->pwrdm_clkdms[0]->flags & CLKDM_CAN_ENABLE_AUTO)
 143                         omap2_clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
 144                 else
 145                         omap2_clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
 146                 break;
 147         case LOWPOWERSTATE_SWITCH:
 148                 pwrdm_set_lowpwrstchange(pwrdm);
 149                 break;
 150         default:
 151                 return ret;
 152         }
 153
 154         pwrdm_wait_transition(pwrdm);
 155         pwrdm_state_switch(pwrdm);
 156 err:
 157         return ret;
 158 }
 159
 160 /*
 161  * This API is to be called during init to put the various voltage
 162  * domains to the voltage as per the opp table. Typically we boot up
 163  * at the nominal voltage. So this function finds out the rate of
 164  * the clock associated with the voltage domain, finds out the correct
 165  * opp entry and puts the voltage domain to the voltage specifies
 166  * in the opp entry
 167  */
 168 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
 169                                                 struct device *dev)
 170 {
 171         struct voltagedomain *voltdm;
 172         struct clk *clk;
 173         struct opp *opp;
 174         unsigned long freq, bootup_volt;
 175
 176         if (!vdd_name || !clk_name || !dev) {
 177                 printk(KERN_ERR "%s: Invalid parameters!\n", __func__);
 178                 goto exit;
 179         }
 180
 181         voltdm = omap_voltage_domain_lookup(vdd_name);
 182         if (IS_ERR(voltdm)) {
 183                 printk(KERN_ERR "%s: Unable to get vdd pointer for vdd_%s\n",
 184                         __func__, vdd_name);
 185                 goto exit;
 186         }
 187
 188         clk =  clk_get(NULL, clk_name);
 189         if (IS_ERR(clk)) {
 190                 printk(KERN_ERR "%s: unable to get clk %s\n",
 191                         __func__, clk_name);
 192                 goto exit;
 193         }
 194
 195         freq = clk->rate;
 196         clk_put(clk);
 197
 198         opp = opp_find_freq_ceil(dev, &freq);
 199         if (IS_ERR(opp)) {
 200                 printk(KERN_ERR "%s: unable to find boot up OPP for vdd_%s\n",
 201                         __func__, vdd_name);
 202                 goto exit;
 203         }
 204
 205         bootup_volt = opp_get_voltage(opp);
 206         if (!bootup_volt) {
 207                 printk(KERN_ERR "%s: unable to find voltage corresponding"
 208                         "to the bootup OPP for vdd_%s\n", __func__, vdd_name);
 209                 goto exit;
 210         }
 211
 212         omap_voltage_scale_vdd(voltdm, bootup_volt);
 213         return 0;
 214
 215 exit:
 216         printk(KERN_ERR "%s: Unable to put vdd_%s to its init voltage\n\n",
 217                 __func__, vdd_name);
 218         return -EINVAL;
 219 }
 220
 221 static void __init omap3_init_voltages(void)
 222 {
 223         if (!cpu_is_omap34xx())
 224                 return;
 225
 226         omap2_set_init_voltage("mpu", "dpll1_ck", mpu_dev);
 227         omap2_set_init_voltage("core", "l3_ick", l3_dev);
 228 }
 229
 230 static void __init omap4_init_voltages(void)
 231 {
 232         if (!cpu_is_omap44xx())
 233                 return;
 234
 235         omap2_set_init_voltage("mpu", "dpll_mpu_ck", mpu_dev);
 236         omap2_set_init_voltage("core", "l3_div_ck", l3_dev);
 237         omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", iva_dev);
 238 }
 239
 240 static int __init omap2_common_pm_init(void)
 241 {
 242         omap2_init_processor_devices();
 243         omap_pm_if_init();
 244
 245         return 0;
 246 }
 247 postcore_initcall(omap2_common_pm_init);
 248
 249 static int __init omap2_common_pm_late_init(void)
 250 {
 251         /* Init the OMAP TWL parameters */
 252         omap3_twl_init();
 253         omap4_twl_init();
 254
 255         /* Init the voltage layer */
 256         omap_voltage_late_init();
 257
 258         /* Initialize the voltages */
 259         omap3_init_voltages();
 260         omap4_init_voltages();
 261
 262         /* Smartreflex device init */
 263         omap_devinit_smartreflex();
 264
 265         return 0;
 266 }
 267 late_initcall(omap2_common_pm_late_init);