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