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 #include <linux/suspend.h>
  19
  20 #include <plat/omap-pm.h>
  21 #include <plat/omap_device.h>
  22 #include "common.h"
  23
  24 #include "prcm-common.h"
  25 #include "voltage.h"
  26 #include "powerdomain.h"
  27 #include "clockdomain.h"
  28 #include "pm.h"
  29 #include "twl-common.h"
  30
  31 static struct omap_device_pm_latency *pm_lats;
  32
  33 /*
  34  * omap_pm_suspend: points to a function that does the SoC-specific
  35  * suspend work
  36  */
  37 int (*omap_pm_suspend)(void);
  38
  39 static int __init _init_omap_device(char *name)
  40 {
  41         struct omap_hwmod *oh;
  42         struct platform_device *pdev;
  43
  44         oh = omap_hwmod_lookup(name);
  45         if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
  46                  __func__, name))
  47                 return -ENODEV;
  48
  49         pdev = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
  50         if (WARN(IS_ERR(pdev), "%s: could not build omap_device for %s\n",
  51                  __func__, name))
  52                 return -ENODEV;
  53
  54         return 0;
  55 }
  56
  57 /*
  58  * Build omap_devices for processors and bus.
  59  */
  60 static void __init omap2_init_processor_devices(void)
  61 {
  62         _init_omap_device("mpu");
  63         if (omap3_has_iva())
  64                 _init_omap_device("iva");
  65
  66         if (cpu_is_omap44xx()) {
  67                 _init_omap_device("l3_main_1");
  68                 _init_omap_device("dsp");
  69                 _init_omap_device("iva");
  70         } else {
  71                 _init_omap_device("l3_main");
  72         }
  73 }
  74
  75 /* Types of sleep_switch used in omap_set_pwrdm_state */
  76 #define FORCEWAKEUP_SWITCH      0
  77 #define LOWPOWERSTATE_SWITCH    1
  78
  79 int __init omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
  80 {
  81         if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
  82                 clkdm_allow_idle(clkdm);
  83         else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
  84                  atomic_read(&clkdm->usecount) == 0)
  85                 clkdm_sleep(clkdm);
  86         return 0;
  87 }
  88
  89 /*
  90  * This sets pwrdm state (other than mpu & core. Currently only ON &
  91  * RET are supported.
  92  */
  93 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 pwrst)
  94 {
  95         u8 curr_pwrst, next_pwrst;
  96         int sleep_switch = -1, ret = 0, hwsup = 0;
  97
  98         if (!pwrdm || IS_ERR(pwrdm))
  99                 return -EINVAL;
 100
 101         while (!(pwrdm->pwrsts & (1 << pwrst))) {
 102                 if (pwrst == PWRDM_POWER_OFF)
 103                         return ret;
 104                 pwrst--;
 105         }
 106
 107         next_pwrst = pwrdm_read_next_pwrst(pwrdm);
 108         if (next_pwrst == pwrst)
 109                 return ret;
 110
 111         curr_pwrst = pwrdm_read_pwrst(pwrdm);
 112         if (curr_pwrst < PWRDM_POWER_ON) {
 113                 if ((curr_pwrst > pwrst) &&
 114                         (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
 115                         sleep_switch = LOWPOWERSTATE_SWITCH;
 116                 } else {
 117                         hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
 118                         clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
 119                         sleep_switch = FORCEWAKEUP_SWITCH;
 120                 }
 121         }
 122
 123         ret = pwrdm_set_next_pwrst(pwrdm, pwrst);
 124         if (ret)
 125                 pr_err("%s: unable to set power state of powerdomain: %s\n",
 126                        __func__, pwrdm->name);
 127
 128         switch (sleep_switch) {
 129         case FORCEWAKEUP_SWITCH:
 130                 if (hwsup)
 131                         clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
 132                 else
 133                         clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
 134                 break;
 135         case LOWPOWERSTATE_SWITCH:
 136                 pwrdm_set_lowpwrstchange(pwrdm);
 137                 pwrdm_wait_transition(pwrdm);
 138                 pwrdm_state_switch(pwrdm);
 139                 break;
 140         }
 141
 142         return ret;
 143 }
 144
 145
 146
 147 /*
 148  * This API is to be called during init to set the various voltage
 149  * domains to the voltage as per the opp table. Typically we boot up
 150  * at the nominal voltage. So this function finds out the rate of
 151  * the clock associated with the voltage domain, finds out the correct
 152  * opp entry and sets the voltage domain to the voltage specified
 153  * in the opp entry
 154  */
 155 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
 156                                          const char *oh_name)
 157 {
 158         struct voltagedomain *voltdm;
 159         struct clk *clk;
 160         struct opp *opp;
 161         unsigned long freq, bootup_volt;
 162         struct device *dev;
 163
 164         if (!vdd_name || !clk_name || !oh_name) {
 165                 pr_err("%s: invalid parameters\n", __func__);
 166                 goto exit;
 167         }
 168
 169         dev = omap_device_get_by_hwmod_name(oh_name);
 170         if (IS_ERR(dev)) {
 171                 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
 172                         __func__, oh_name);
 173                 goto exit;
 174         }
 175
 176         voltdm = voltdm_lookup(vdd_name);
 177         if (IS_ERR(voltdm)) {
 178                 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
 179                         __func__, vdd_name);
 180                 goto exit;
 181         }
 182
 183         clk =  clk_get(NULL, clk_name);
 184         if (IS_ERR(clk)) {
 185                 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
 186                 goto exit;
 187         }
 188
 189         freq = clk->rate;
 190         clk_put(clk);
 191
 192         rcu_read_lock();
 193         opp = opp_find_freq_ceil(dev, &freq);
 194         if (IS_ERR(opp)) {
 195                 rcu_read_unlock();
 196                 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
 197                         __func__, vdd_name);
 198                 goto exit;
 199         }
 200
 201         bootup_volt = opp_get_voltage(opp);
 202         rcu_read_unlock();
 203         if (!bootup_volt) {
 204                 pr_err("%s: unable to find voltage corresponding "
 205                         "to the bootup OPP for vdd_%s\n", __func__, vdd_name);
 206                 goto exit;
 207         }
 208
 209         voltdm_scale(voltdm, bootup_volt);
 210         return 0;
 211
 212 exit:
 213         pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
 214         return -EINVAL;
 215 }
 216
 217 #ifdef CONFIG_SUSPEND
 218 static int omap_pm_enter(suspend_state_t suspend_state)
 219 {
 220         int ret = 0;
 221
 222         if (!omap_pm_suspend)
 223                 return -ENOENT; /* XXX doublecheck */
 224
 225         switch (suspend_state) {
 226         case PM_SUSPEND_STANDBY:
 227         case PM_SUSPEND_MEM:
 228                 ret = omap_pm_suspend();
 229                 break;
 230         default:
 231                 ret = -EINVAL;
 232         }
 233
 234         return ret;
 235 }
 236
 237 static int omap_pm_begin(suspend_state_t state)
 238 {
 239         disable_hlt();
 240         if (cpu_is_omap34xx())
 241                 omap_prcm_irq_prepare();
 242         return 0;
 243 }
 244
 245 static void omap_pm_end(void)
 246 {
 247         enable_hlt();
 248         return;
 249 }
 250
 251 static void omap_pm_finish(void)
 252 {
 253         if (cpu_is_omap34xx())
 254                 omap_prcm_irq_complete();
 255 }
 256
 257 static const struct platform_suspend_ops omap_pm_ops = {
 258         .begin          = omap_pm_begin,
 259         .end            = omap_pm_end,
 260         .enter          = omap_pm_enter,
 261         .finish         = omap_pm_finish,
 262         .valid          = suspend_valid_only_mem,
 263 };
 264
 265 #endif /* CONFIG_SUSPEND */
 266
 267 static void __init omap3_init_voltages(void)
 268 {
 269         if (!cpu_is_omap34xx())
 270                 return;
 271
 272         omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
 273         omap2_set_init_voltage("core", "l3_ick", "l3_main");
 274 }
 275
 276 static void __init omap4_init_voltages(void)
 277 {
 278         if (!cpu_is_omap44xx())
 279                 return;
 280
 281         omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
 282         omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
 283         omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
 284 }
 285
 286 static int __init omap2_common_pm_init(void)
 287 {
 288         if (!of_have_populated_dt())
 289                 omap2_init_processor_devices();
 290         omap_pm_if_init();
 291
 292         return 0;
 293 }
 294 postcore_initcall(omap2_common_pm_init);
 295
 296 static int __init omap2_common_pm_late_init(void)
 297 {
 298         /*
 299          * In the case of DT, the PMIC and SR initialization will be done using
 300          * a completely different mechanism.
 301          * Disable this part if a DT blob is available.
 302          */
 303         if (of_have_populated_dt())
 304                 return 0;
 305
 306         /* Init the voltage layer */
 307         omap_pmic_late_init();
 308         omap_voltage_late_init();
 309
 310         /* Initialize the voltages */
 311         omap3_init_voltages();
 312         omap4_init_voltages();
 313
 314         /* Smartreflex device init */
 315         omap_devinit_smartreflex();
 316
 317 #ifdef CONFIG_SUSPEND
 318         suspend_set_ops(&omap_pm_ops);
 319 #endif
 320
 321         return 0;
 322 }
 323 late_initcall(omap2_common_pm_late_init);