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 <asm/system_misc.h>
  21
  22 #include <plat/omap-pm.h>
  23 #include <plat/omap_device.h>
  24 #include "common.h"
  25
  26 #include "prcm-common.h"
  27 #include "voltage.h"
  28 #include "powerdomain.h"
  29 #include "clockdomain.h"
  30 #include "pm.h"
  31 #include "twl-common.h"
  32
  33 static struct omap_device_pm_latency *pm_lats;
  34
  35 /*
  36  * omap_pm_suspend: points to a function that does the SoC-specific
  37  * suspend work
  38  */
  39 int (*omap_pm_suspend)(void);
  40
  41 static int __init _init_omap_device(char *name)
  42 {
  43         struct omap_hwmod *oh;
  44         struct platform_device *pdev;
  45
  46         oh = omap_hwmod_lookup(name);
  47         if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
  48                  __func__, name))
  49                 return -ENODEV;
  50
  51         pdev = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
  52         if (WARN(IS_ERR(pdev), "%s: could not build omap_device for %s\n",
  53                  __func__, name))
  54                 return -ENODEV;
  55
  56         return 0;
  57 }
  58
  59 /*
  60  * Build omap_devices for processors and bus.
  61  */
  62 static void __init omap2_init_processor_devices(void)
  63 {
  64         _init_omap_device("mpu");
  65         if (omap3_has_iva())
  66                 _init_omap_device("iva");
  67
  68         if (cpu_is_omap44xx()) {
  69                 _init_omap_device("l3_main_1");
  70                 _init_omap_device("dsp");
  71                 _init_omap_device("iva");
  72         } else {
  73                 _init_omap_device("l3_main");
  74         }
  75 }
  76
  77 /* Types of sleep_switch used in omap_set_pwrdm_state */
  78 #define FORCEWAKEUP_SWITCH      0
  79 #define LOWPOWERSTATE_SWITCH    1
  80
  81 int __init omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
  82 {
  83         if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
  84                 clkdm_allow_idle(clkdm);
  85         else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
  86                  atomic_read(&clkdm->usecount) == 0)
  87                 clkdm_sleep(clkdm);
  88         return 0;
  89 }
  90
  91 /*
  92  * This sets pwrdm state (other than mpu & core. Currently only ON &
  93  * RET are supported.
  94  */
  95 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 pwrst)
  96 {
  97         u8 curr_pwrst, next_pwrst;
  98         int sleep_switch = -1, ret = 0, hwsup = 0;
  99
 100         if (!pwrdm || IS_ERR(pwrdm))
 101                 return -EINVAL;
 102
 103         while (!(pwrdm->pwrsts & (1 << pwrst))) {
 104                 if (pwrst == PWRDM_POWER_OFF)
 105                         return ret;
 106                 pwrst--;
 107         }
 108
 109         next_pwrst = pwrdm_read_next_pwrst(pwrdm);
 110         if (next_pwrst == pwrst)
 111                 return ret;
 112
 113         curr_pwrst = pwrdm_read_pwrst(pwrdm);
 114         if (curr_pwrst < PWRDM_POWER_ON) {
 115                 if ((curr_pwrst > pwrst) &&
 116                         (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
 117                         sleep_switch = LOWPOWERSTATE_SWITCH;
 118                 } else {
 119                         hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
 120                         clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
 121                         sleep_switch = FORCEWAKEUP_SWITCH;
 122                 }
 123         }
 124
 125         ret = pwrdm_set_next_pwrst(pwrdm, pwrst);
 126         if (ret)
 127                 pr_err("%s: unable to set power state of powerdomain: %s\n",
 128                        __func__, pwrdm->name);
 129
 130         switch (sleep_switch) {
 131         case FORCEWAKEUP_SWITCH:
 132                 if (hwsup)
 133                         clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
 134                 else
 135                         clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
 136                 break;
 137         case LOWPOWERSTATE_SWITCH:
 138                 pwrdm_set_lowpwrstchange(pwrdm);
 139                 pwrdm_wait_transition(pwrdm);
 140                 pwrdm_state_switch(pwrdm);
 141                 break;
 142         }
 143
 144         return ret;
 145 }
 146
 147
 148
 149 /*
 150  * This API is to be called during init to set the various voltage
 151  * domains to the voltage as per the opp table. Typically we boot up
 152  * at the nominal voltage. So this function finds out the rate of
 153  * the clock associated with the voltage domain, finds out the correct
 154  * opp entry and sets the voltage domain to the voltage specified
 155  * in the opp entry
 156  */
 157 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
 158                                          const char *oh_name)
 159 {
 160         struct voltagedomain *voltdm;
 161         struct clk *clk;
 162         struct opp *opp;
 163         unsigned long freq, bootup_volt;
 164         struct device *dev;
 165
 166         if (!vdd_name || !clk_name || !oh_name) {
 167                 pr_err("%s: invalid parameters\n", __func__);
 168                 goto exit;
 169         }
 170
 171         dev = omap_device_get_by_hwmod_name(oh_name);
 172         if (IS_ERR(dev)) {
 173                 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
 174                         __func__, oh_name);
 175                 goto exit;
 176         }
 177
 178         voltdm = voltdm_lookup(vdd_name);
 179         if (IS_ERR(voltdm)) {
 180                 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
 181                         __func__, vdd_name);
 182                 goto exit;
 183         }
 184
 185         clk =  clk_get(NULL, clk_name);
 186         if (IS_ERR(clk)) {
 187                 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
 188                 goto exit;
 189         }
 190
 191         freq = clk->rate;
 192         clk_put(clk);
 193
 194         rcu_read_lock();
 195         opp = opp_find_freq_ceil(dev, &freq);
 196         if (IS_ERR(opp)) {
 197                 rcu_read_unlock();
 198                 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
 199                         __func__, vdd_name);
 200                 goto exit;
 201         }
 202
 203         bootup_volt = opp_get_voltage(opp);
 204         rcu_read_unlock();
 205         if (!bootup_volt) {
 206                 pr_err("%s: unable to find voltage corresponding "
 207                         "to the bootup OPP for vdd_%s\n", __func__, vdd_name);
 208                 goto exit;
 209         }
 210
 211         voltdm_scale(voltdm, bootup_volt);
 212         return 0;
 213
 214 exit:
 215         pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
 216         return -EINVAL;
 217 }
 218
 219 #ifdef CONFIG_SUSPEND
 220 static int omap_pm_enter(suspend_state_t suspend_state)
 221 {
 222         int ret = 0;
 223
 224         if (!omap_pm_suspend)
 225                 return -ENOENT; /* XXX doublecheck */
 226
 227         switch (suspend_state) {
 228         case PM_SUSPEND_STANDBY:
 229         case PM_SUSPEND_MEM:
 230                 ret = omap_pm_suspend();
 231                 break;
 232         default:
 233                 ret = -EINVAL;
 234         }
 235
 236         return ret;
 237 }
 238
 239 static int omap_pm_begin(suspend_state_t state)
 240 {
 241         disable_hlt();
 242         if (cpu_is_omap34xx())
 243                 omap_prcm_irq_prepare();
 244         return 0;
 245 }
 246
 247 static void omap_pm_end(void)
 248 {
 249         enable_hlt();
 250         return;
 251 }
 252
 253 static void omap_pm_finish(void)
 254 {
 255         if (cpu_is_omap34xx())
 256                 omap_prcm_irq_complete();
 257 }
 258
 259 static const struct platform_suspend_ops omap_pm_ops = {
 260         .begin          = omap_pm_begin,
 261         .end            = omap_pm_end,
 262         .enter          = omap_pm_enter,
 263         .finish         = omap_pm_finish,
 264         .valid          = suspend_valid_only_mem,
 265 };
 266
 267 #endif /* CONFIG_SUSPEND */
 268
 269 static void __init omap3_init_voltages(void)
 270 {
 271         if (!cpu_is_omap34xx())
 272                 return;
 273
 274         omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
 275         omap2_set_init_voltage("core", "l3_ick", "l3_main");
 276 }
 277
 278 static void __init omap4_init_voltages(void)
 279 {
 280         if (!cpu_is_omap44xx())
 281                 return;
 282
 283         omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
 284         omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
 285         omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
 286 }
 287
 288 static int __init omap2_common_pm_init(void)
 289 {
 290         if (!of_have_populated_dt())
 291                 omap2_init_processor_devices();
 292         omap_pm_if_init();
 293
 294         return 0;
 295 }
 296 postcore_initcall(omap2_common_pm_init);
 297
 298 int __init omap2_common_pm_late_init(void)
 299 {
 300         /*
 301          * In the case of DT, the PMIC and SR initialization will be done using
 302          * a completely different mechanism.
 303          * Disable this part if a DT blob is available.
 304          */
 305         if (of_have_populated_dt())
 306                 return 0;
 307
 308         /* Init the voltage layer */
 309         omap_pmic_late_init();
 310         omap_voltage_late_init();
 311
 312         /* Initialize the voltages */
 313         omap3_init_voltages();
 314         omap4_init_voltages();
 315
 316         /* Smartreflex device init */
 317         omap_devinit_smartreflex();
 318
 319 #ifdef CONFIG_SUSPEND
 320         suspend_set_ops(&omap_pm_ops);
 321 #endif
 322
 323         return 0;
 324 }