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
  22 #include "voltage.h"
  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         if (omap3_has_iva())
  87                 _init_omap_device("iva", &iva_dev);
  88
  89         if (cpu_is_omap44xx()) {
  90                 _init_omap_device("l3_main_1", &l3_dev);
  91                 _init_omap_device("dsp", &dsp_dev);
  92                 _init_omap_device("iva", &iva_dev);
  93         } else {
  94                 _init_omap_device("l3_main", &l3_dev);
  95         }
  96 }
  97
  98 /* Types of sleep_switch used in omap_set_pwrdm_state */
  99 #define FORCEWAKEUP_SWITCH      0
 100 #define LOWPOWERSTATE_SWITCH    1
 101
 102 /*
 103  * This sets pwrdm state (other than mpu & core. Currently only ON &
 104  * RET are supported.
 105  */
 106 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
 107 {
 108         u32 cur_state;
 109         int sleep_switch = 0;
 110         int ret = 0;
 111
 112         if (pwrdm == NULL || IS_ERR(pwrdm))
 113                 return -EINVAL;
 114
 115         while (!(pwrdm->pwrsts & (1 << state))) {
 116                 if (state == PWRDM_POWER_OFF)
 117                         return ret;
 118                 state--;
 119         }
 120
 121         cur_state = pwrdm_read_next_pwrst(pwrdm);
 122         if (cur_state == state)
 123                 return ret;
 124
 125         if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
 126                 if ((pwrdm_read_pwrst(pwrdm) > state) &&
 127                         (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
 128                         sleep_switch = LOWPOWERSTATE_SWITCH;
 129                 } else {
 130                         clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
 131                         pwrdm_wait_transition(pwrdm);
 132                         sleep_switch = FORCEWAKEUP_SWITCH;
 133                 }
 134         }
 135
 136         ret = pwrdm_set_next_pwrst(pwrdm, state);
 137         if (ret) {
 138                 printk(KERN_ERR "Unable to set state of powerdomain: %s\n",
 139                        pwrdm->name);
 140                 goto err;
 141         }
 142
 143         switch (sleep_switch) {
 144         case FORCEWAKEUP_SWITCH:
 145                 if (pwrdm->pwrdm_clkdms[0]->flags & CLKDM_CAN_ENABLE_AUTO)
 146                         clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
 147                 else
 148                         clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
 149                 break;
 150         case LOWPOWERSTATE_SWITCH:
 151                 pwrdm_set_lowpwrstchange(pwrdm);
 152                 break;
 153         default:
 154                 return ret;
 155         }
 156
 157         pwrdm_wait_transition(pwrdm);
 158         pwrdm_state_switch(pwrdm);
 159 err:
 160         return ret;
 161 }
 162
 163 /*
 164  * This API is to be called during init to put the various voltage
 165  * domains to the voltage as per the opp table. Typically we boot up
 166  * at the nominal voltage. So this function finds out the rate of
 167  * the clock associated with the voltage domain, finds out the correct
 168  * opp entry and puts the voltage domain to the voltage specifies
 169  * in the opp entry
 170  */
 171 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
 172                                                 struct device *dev)
 173 {
 174         struct voltagedomain *voltdm;
 175         struct clk *clk;
 176         struct opp *opp;
 177         unsigned long freq, bootup_volt;
 178
 179         if (!vdd_name || !clk_name || !dev) {
 180                 printk(KERN_ERR "%s: Invalid parameters!\n", __func__);
 181                 goto exit;
 182         }
 183
 184         voltdm = omap_voltage_domain_lookup(vdd_name);
 185         if (IS_ERR(voltdm)) {
 186                 printk(KERN_ERR "%s: Unable to get vdd pointer for vdd_%s\n",
 187                         __func__, vdd_name);
 188                 goto exit;
 189         }
 190
 191         clk =  clk_get(NULL, clk_name);
 192         if (IS_ERR(clk)) {
 193                 printk(KERN_ERR "%s: unable to get clk %s\n",
 194                         __func__, clk_name);
 195                 goto exit;
 196         }
 197
 198         freq = clk->rate;
 199         clk_put(clk);
 200
 201         opp = opp_find_freq_ceil(dev, &freq);
 202         if (IS_ERR(opp)) {
 203                 printk(KERN_ERR "%s: unable to find boot up OPP for vdd_%s\n",
 204                         __func__, vdd_name);
 205                 goto exit;
 206         }
 207
 208         bootup_volt = opp_get_voltage(opp);
 209         if (!bootup_volt) {
 210                 printk(KERN_ERR "%s: unable to find voltage corresponding"
 211                         "to the bootup OPP for vdd_%s\n", __func__, vdd_name);
 212                 goto exit;
 213         }
 214
 215         omap_voltage_scale_vdd(voltdm, bootup_volt);
 216         return 0;
 217
 218 exit:
 219         printk(KERN_ERR "%s: Unable to put vdd_%s to its init voltage\n\n",
 220                 __func__, vdd_name);
 221         return -EINVAL;
 222 }
 223
 224 static void __init omap3_init_voltages(void)
 225 {
 226         if (!cpu_is_omap34xx())
 227                 return;
 228
 229         omap2_set_init_voltage("mpu", "dpll1_ck", mpu_dev);
 230         omap2_set_init_voltage("core", "l3_ick", l3_dev);
 231 }
 232
 233 static void __init omap4_init_voltages(void)
 234 {
 235         if (!cpu_is_omap44xx())
 236                 return;
 237
 238         omap2_set_init_voltage("mpu", "dpll_mpu_ck", mpu_dev);
 239         omap2_set_init_voltage("core", "l3_div_ck", l3_dev);
 240         omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", iva_dev);
 241 }
 242
 243 static int __init omap2_common_pm_init(void)
 244 {
 245         omap2_init_processor_devices();
 246         omap_pm_if_init();
 247
 248         return 0;
 249 }
 250 postcore_initcall(omap2_common_pm_init);
 251
 252 static int __init omap2_common_pm_late_init(void)
 253 {
 254         /* Init the OMAP TWL parameters */
 255         omap3_twl_init();
 256         omap4_twl_init();
 257
 258         /* Init the voltage layer */
 259         omap_voltage_late_init();
 260
 261         /* Initialize the voltages */
 262         omap3_init_voltages();
 263         omap4_init_voltages();
 264
 265         /* Smartreflex device init */
 266         omap_devinit_smartreflex();
 267
 268         return 0;
 269 }
 270 late_initcall(omap2_common_pm_late_init);