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
  28 static struct omap_device_pm_latency *pm_lats;
  29
  30 static struct device *mpu_dev;
  31 static struct device *iva_dev;
  32 static struct device *l3_dev;
  33 static struct device *dsp_dev;
  34
  35 struct device *omap2_get_mpuss_device(void)
  36 {
  37         WARN_ON_ONCE(!mpu_dev);
  38         return mpu_dev;
  39 }
  40
  41 struct device *omap2_get_iva_device(void)
  42 {
  43         WARN_ON_ONCE(!iva_dev);
  44         return iva_dev;
  45 }
  46
  47 struct device *omap2_get_l3_device(void)
  48 {
  49         WARN_ON_ONCE(!l3_dev);
  50         return l3_dev;
  51 }
  52
  53 struct device *omap4_get_dsp_device(void)
  54 {
  55         WARN_ON_ONCE(!dsp_dev);
  56         return dsp_dev;
  57 }
  58 EXPORT_SYMBOL(omap4_get_dsp_device);
  59
  60 /* static int _init_omap_device(struct omap_hwmod *oh, void *user) */
  61 static int _init_omap_device(char *name, struct device **new_dev)
  62 {
  63         struct omap_hwmod *oh;
  64         struct omap_device *od;
  65
  66         oh = omap_hwmod_lookup(name);
  67         if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
  68                  __func__, name))
  69                 return -ENODEV;
  70
  71         od = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
  72         if (WARN(IS_ERR(od), "%s: could not build omap_device for %s\n",
  73                  __func__, name))
  74                 return -ENODEV;
  75
  76         *new_dev = &od->pdev.dev;
  77
  78         return 0;
  79 }
  80
  81 /*
  82  * Build omap_devices for processors and bus.
  83  */
  84 static void omap2_init_processor_devices(void)
  85 {
  86         _init_omap_device("mpu", &mpu_dev);
  87         if (omap3_has_iva())
  88                 _init_omap_device("iva", &iva_dev);
  89
  90         if (cpu_is_omap44xx()) {
  91                 _init_omap_device("l3_main_1", &l3_dev);
  92                 _init_omap_device("dsp", &dsp_dev);
  93                 _init_omap_device("iva", &iva_dev);
  94         } else {
  95                 _init_omap_device("l3_main", &l3_dev);
  96         }
  97 }
  98
  99 /* Types of sleep_switch used in omap_set_pwrdm_state */
 100 #define FORCEWAKEUP_SWITCH      0
 101 #define LOWPOWERSTATE_SWITCH    1
 102
 103 /*
 104  * This sets pwrdm state (other than mpu & core. Currently only ON &
 105  * RET are supported.
 106  */
 107 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
 108 {
 109         u32 cur_state;
 110         int sleep_switch = -1;
 111         int ret = 0;
 112         int hwsup = 0;
 113
 114         if (pwrdm == NULL || IS_ERR(pwrdm))
 115                 return -EINVAL;
 116
 117         while (!(pwrdm->pwrsts & (1 << state))) {
 118                 if (state == PWRDM_POWER_OFF)
 119                         return ret;
 120                 state--;
 121         }
 122
 123         cur_state = pwrdm_read_next_pwrst(pwrdm);
 124         if (cur_state == state)
 125                 return ret;
 126
 127         if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
 128                 if ((pwrdm_read_pwrst(pwrdm) > state) &&
 129                         (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
 130                         sleep_switch = LOWPOWERSTATE_SWITCH;
 131                 } else {
 132                         hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
 133                         clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
 134                         pwrdm_wait_transition(pwrdm);
 135                         sleep_switch = FORCEWAKEUP_SWITCH;
 136                 }
 137         }
 138
 139         ret = pwrdm_set_next_pwrst(pwrdm, state);
 140         if (ret) {
 141                 printk(KERN_ERR "Unable to set state of powerdomain: %s\n",
 142                        pwrdm->name);
 143                 goto err;
 144         }
 145
 146         switch (sleep_switch) {
 147         case FORCEWAKEUP_SWITCH:
 148                 if (hwsup)
 149                         clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
 150                 else
 151                         clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
 152                 break;
 153         case LOWPOWERSTATE_SWITCH:
 154                 pwrdm_set_lowpwrstchange(pwrdm);
 155                 break;
 156         default:
 157                 return ret;
 158         }
 159
 160         pwrdm_wait_transition(pwrdm);
 161         pwrdm_state_switch(pwrdm);
 162 err:
 163         return ret;
 164 }
 165
 166 /*
 167  * This API is to be called during init to put the various voltage
 168  * domains to the voltage as per the opp table. Typically we boot up
 169  * at the nominal voltage. So this function finds out the rate of
 170  * the clock associated with the voltage domain, finds out the correct
 171  * opp entry and puts the voltage domain to the voltage specifies
 172  * in the opp entry
 173  */
 174 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
 175                                                 struct device *dev)
 176 {
 177         struct voltagedomain *voltdm;
 178         struct clk *clk;
 179         struct opp *opp;
 180         unsigned long freq, bootup_volt;
 181
 182         if (!vdd_name || !clk_name || !dev) {
 183                 printk(KERN_ERR "%s: Invalid parameters!\n", __func__);
 184                 goto exit;
 185         }
 186
 187         voltdm = omap_voltage_domain_lookup(vdd_name);
 188         if (IS_ERR(voltdm)) {
 189                 printk(KERN_ERR "%s: Unable to get vdd pointer for vdd_%s\n",
 190                         __func__, vdd_name);
 191                 goto exit;
 192         }
 193
 194         clk =  clk_get(NULL, clk_name);
 195         if (IS_ERR(clk)) {
 196                 printk(KERN_ERR "%s: unable to get clk %s\n",
 197                         __func__, clk_name);
 198                 goto exit;
 199         }
 200
 201         freq = clk->rate;
 202         clk_put(clk);
 203
 204         opp = opp_find_freq_ceil(dev, &freq);
 205         if (IS_ERR(opp)) {
 206                 printk(KERN_ERR "%s: unable to find boot up OPP for vdd_%s\n",
 207                         __func__, vdd_name);
 208                 goto exit;
 209         }
 210
 211         bootup_volt = opp_get_voltage(opp);
 212         if (!bootup_volt) {
 213                 printk(KERN_ERR "%s: unable to find voltage corresponding"
 214                         "to the bootup OPP for vdd_%s\n", __func__, vdd_name);
 215                 goto exit;
 216         }
 217
 218         omap_voltage_scale_vdd(voltdm, bootup_volt);
 219         return 0;
 220
 221 exit:
 222         printk(KERN_ERR "%s: Unable to put vdd_%s to its init voltage\n\n",
 223                 __func__, vdd_name);
 224         return -EINVAL;
 225 }
 226
 227 static void __init omap3_init_voltages(void)
 228 {
 229         if (!cpu_is_omap34xx())
 230                 return;
 231
 232         omap2_set_init_voltage("mpu", "dpll1_ck", mpu_dev);
 233         omap2_set_init_voltage("core", "l3_ick", l3_dev);
 234 }
 235
 236 static void __init omap4_init_voltages(void)
 237 {
 238         if (!cpu_is_omap44xx())
 239                 return;
 240
 241         omap2_set_init_voltage("mpu", "dpll_mpu_ck", mpu_dev);
 242         omap2_set_init_voltage("core", "l3_div_ck", l3_dev);
 243         omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", iva_dev);
 244 }
 245
 246 static int __init omap2_common_pm_init(void)
 247 {
 248         omap2_init_processor_devices();
 249         omap_pm_if_init();
 250
 251         return 0;
 252 }
 253 postcore_initcall(omap2_common_pm_init);
 254
 255 static int __init omap2_common_pm_late_init(void)
 256 {
 257         /* Init the OMAP TWL parameters */
 258         omap3_twl_init();
 259         omap4_twl_init();
 260
 261         /* Init the voltage layer */
 262         omap_voltage_late_init();
 263
 264         /* Initialize the voltages */
 265         omap3_init_voltages();
 266         omap4_init_voltages();
 267
 268         /* Smartreflex device init */
 269         omap_devinit_smartreflex();
 270
 271         return 0;
 272 }
 273 late_initcall(omap2_common_pm_late_init);