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 platform_device *pdev;
  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         pdev = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
  71         if (WARN(IS_ERR(pdev), "%s: could not build omap_device for %s\n",
  72                  __func__, name))
  73                 return -ENODEV;
  74
  75         *new_dev = &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 = -1;
 110         int ret = 0;
 111         int hwsup = 0;
 112
 113         if (pwrdm == NULL || IS_ERR(pwrdm))
 114                 return -EINVAL;
 115
 116         while (!(pwrdm->pwrsts & (1 << state))) {
 117                 if (state == PWRDM_POWER_OFF)
 118                         return ret;
 119                 state--;
 120         }
 121
 122         cur_state = pwrdm_read_next_pwrst(pwrdm);
 123         if (cur_state == state)
 124                 return ret;
 125
 126         if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
 127                 if ((pwrdm_read_pwrst(pwrdm) > state) &&
 128                         (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
 129                         sleep_switch = LOWPOWERSTATE_SWITCH;
 130                 } else {
 131                         hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
 132                         clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
 133                         sleep_switch = FORCEWAKEUP_SWITCH;
 134                 }
 135         }
 136
 137         ret = pwrdm_set_next_pwrst(pwrdm, state);
 138         if (ret) {
 139                 pr_err("%s: unable to set state of powerdomain: %s\n",
 140                        __func__, pwrdm->name);
 141                 goto err;
 142         }
 143
 144         switch (sleep_switch) {
 145         case FORCEWAKEUP_SWITCH:
 146                 if (hwsup)
 147                         clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
 148                 else
 149                         clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
 150                 break;
 151         case LOWPOWERSTATE_SWITCH:
 152                 pwrdm_set_lowpwrstchange(pwrdm);
 153                 break;
 154         default:
 155                 return ret;
 156         }
 157
 158         pwrdm_state_switch(pwrdm);
 159 err:
 160         return ret;
 161 }
 162
 163 /*
 164  * This API is to be called during init to set 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 sets the voltage domain to the voltage specified
 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                 pr_err("%s: invalid parameters\n", __func__);
 181                 goto exit;
 182         }
 183
 184         voltdm = voltdm_lookup(vdd_name);
 185         if (IS_ERR(voltdm)) {
 186                 pr_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                 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
 194                 goto exit;
 195         }
 196
 197         freq = clk->rate;
 198         clk_put(clk);
 199
 200         opp = opp_find_freq_ceil(dev, &freq);
 201         if (IS_ERR(opp)) {
 202                 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
 203                         __func__, vdd_name);
 204                 goto exit;
 205         }
 206
 207         bootup_volt = opp_get_voltage(opp);
 208         if (!bootup_volt) {
 209                 pr_err("%s: unable to find voltage corresponding "
 210                         "to the bootup OPP for vdd_%s\n", __func__, vdd_name);
 211                 goto exit;
 212         }
 213
 214         voltdm_scale(voltdm, bootup_volt);
 215         return 0;
 216
 217 exit:
 218         pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
 219         return -EINVAL;
 220 }
 221
 222 static void __init omap3_init_voltages(void)
 223 {
 224         if (!cpu_is_omap34xx())
 225                 return;
 226
 227         omap2_set_init_voltage("mpu_iva", "dpll1_ck", mpu_dev);
 228         omap2_set_init_voltage("core", "l3_ick", l3_dev);
 229 }
 230
 231 static void __init omap4_init_voltages(void)
 232 {
 233         if (!cpu_is_omap44xx())
 234                 return;
 235
 236         omap2_set_init_voltage("mpu", "dpll_mpu_ck", mpu_dev);
 237         omap2_set_init_voltage("core", "l3_div_ck", l3_dev);
 238         omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", iva_dev);
 239 }
 240
 241 static int __init omap2_common_pm_init(void)
 242 {
 243         omap2_init_processor_devices();
 244         omap_pm_if_init();
 245
 246         return 0;
 247 }
 248 postcore_initcall(omap2_common_pm_init);
 249
 250 static int __init omap2_common_pm_late_init(void)
 251 {
 252         /* Init the OMAP TWL parameters */
 253         omap3_twl_init();
 254         omap4_twl_init();
 255
 256         /* Init the voltage layer */
 257         omap_voltage_late_init();
 258
 259         /* Initialize the voltages */
 260         omap3_init_voltages();
 261         omap4_init_voltages();
 262
 263         /* Smartreflex device init */
 264         omap_devinit_smartreflex();
 265
 266         return 0;
 267 }
 268 late_initcall(omap2_common_pm_late_init);