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 int _init_omap_device(char *name)
  30 {
  31         struct omap_hwmod *oh;
  32         struct platform_device *pdev;
  33
  34         oh = omap_hwmod_lookup(name);
  35         if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
  36                  __func__, name))
  37                 return -ENODEV;
  38
  39         pdev = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
  40         if (WARN(IS_ERR(pdev), "%s: could not build omap_device for %s\n",
  41                  __func__, name))
  42                 return -ENODEV;
  43
  44         return 0;
  45 }
  46
  47 /*
  48  * Build omap_devices for processors and bus.
  49  */
  50 static void omap2_init_processor_devices(void)
  51 {
  52         _init_omap_device("mpu");
  53         if (omap3_has_iva())
  54                 _init_omap_device("iva");
  55
  56         if (cpu_is_omap44xx()) {
  57                 _init_omap_device("l3_main_1");
  58                 _init_omap_device("dsp");
  59                 _init_omap_device("iva");
  60         } else {
  61                 _init_omap_device("l3_main");
  62         }
  63 }
  64
  65 /* Types of sleep_switch used in omap_set_pwrdm_state */
  66 #define FORCEWAKEUP_SWITCH      0
  67 #define LOWPOWERSTATE_SWITCH    1
  68
  69 /*
  70  * This sets pwrdm state (other than mpu & core. Currently only ON &
  71  * RET are supported.
  72  */
  73 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
  74 {
  75         u32 cur_state;
  76         int sleep_switch = -1;
  77         int ret = 0;
  78         int hwsup = 0;
  79
  80         if (pwrdm == NULL || IS_ERR(pwrdm))
  81                 return -EINVAL;
  82
  83         while (!(pwrdm->pwrsts & (1 << state))) {
  84                 if (state == PWRDM_POWER_OFF)
  85                         return ret;
  86                 state--;
  87         }
  88
  89         cur_state = pwrdm_read_next_pwrst(pwrdm);
  90         if (cur_state == state)
  91                 return ret;
  92
  93         if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
  94                 if ((pwrdm_read_pwrst(pwrdm) > state) &&
  95                         (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
  96                         sleep_switch = LOWPOWERSTATE_SWITCH;
  97                 } else {
  98                         hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
  99                         clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
 100                         sleep_switch = FORCEWAKEUP_SWITCH;
 101                 }
 102         }
 103
 104         ret = pwrdm_set_next_pwrst(pwrdm, state);
 105         if (ret) {
 106                 pr_err("%s: unable to set state of powerdomain: %s\n",
 107                        __func__, pwrdm->name);
 108                 goto err;
 109         }
 110
 111         switch (sleep_switch) {
 112         case FORCEWAKEUP_SWITCH:
 113                 if (hwsup)
 114                         clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
 115                 else
 116                         clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
 117                 break;
 118         case LOWPOWERSTATE_SWITCH:
 119                 pwrdm_set_lowpwrstchange(pwrdm);
 120                 break;
 121         default:
 122                 return ret;
 123         }
 124
 125         pwrdm_state_switch(pwrdm);
 126 err:
 127         return ret;
 128 }
 129
 130 /*
 131  * This API is to be called during init to set the various voltage
 132  * domains to the voltage as per the opp table. Typically we boot up
 133  * at the nominal voltage. So this function finds out the rate of
 134  * the clock associated with the voltage domain, finds out the correct
 135  * opp entry and sets the voltage domain to the voltage specified
 136  * in the opp entry
 137  */
 138 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
 139                                          const char *oh_name)
 140 {
 141         struct voltagedomain *voltdm;
 142         struct clk *clk;
 143         struct opp *opp;
 144         unsigned long freq, bootup_volt;
 145         struct device *dev;
 146
 147         if (!vdd_name || !clk_name || !oh_name) {
 148                 pr_err("%s: invalid parameters\n", __func__);
 149                 goto exit;
 150         }
 151
 152         dev = omap_device_get_by_hwmod_name(oh_name);
 153         if (IS_ERR(dev)) {
 154                 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
 155                         __func__, oh_name);
 156                 goto exit;
 157         }
 158
 159         voltdm = voltdm_lookup(vdd_name);
 160         if (IS_ERR(voltdm)) {
 161                 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
 162                         __func__, vdd_name);
 163                 goto exit;
 164         }
 165
 166         clk =  clk_get(NULL, clk_name);
 167         if (IS_ERR(clk)) {
 168                 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
 169                 goto exit;
 170         }
 171
 172         freq = clk->rate;
 173         clk_put(clk);
 174
 175         opp = opp_find_freq_ceil(dev, &freq);
 176         if (IS_ERR(opp)) {
 177                 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
 178                         __func__, vdd_name);
 179                 goto exit;
 180         }
 181
 182         bootup_volt = opp_get_voltage(opp);
 183         if (!bootup_volt) {
 184                 pr_err("%s: unable to find voltage corresponding "
 185                         "to the bootup OPP for vdd_%s\n", __func__, vdd_name);
 186                 goto exit;
 187         }
 188
 189         voltdm_scale(voltdm, bootup_volt);
 190         return 0;
 191
 192 exit:
 193         pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
 194         return -EINVAL;
 195 }
 196
 197 static void __init omap3_init_voltages(void)
 198 {
 199         if (!cpu_is_omap34xx())
 200                 return;
 201
 202         omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
 203         omap2_set_init_voltage("core", "l3_ick", "l3_main");
 204 }
 205
 206 static void __init omap4_init_voltages(void)
 207 {
 208         if (!cpu_is_omap44xx())
 209                 return;
 210
 211         omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
 212         omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
 213         omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
 214 }
 215
 216 static int __init omap2_common_pm_init(void)
 217 {
 218         if (!of_have_populated_dt())
 219                 omap2_init_processor_devices();
 220         omap_pm_if_init();
 221
 222         return 0;
 223 }
 224 postcore_initcall(omap2_common_pm_init);
 225
 226 static int __init omap2_common_pm_late_init(void)
 227 {
 228         /* Init the OMAP TWL parameters */
 229         omap3_twl_init();
 230         omap4_twl_init();
 231
 232         /* Init the voltage layer */
 233         omap_voltage_late_init();
 234
 235         /* Initialize the voltages */
 236         omap3_init_voltages();
 237         omap4_init_voltages();
 238
 239         /* Smartreflex device init */
 240         omap_devinit_smartreflex();
 241
 242         return 0;
 243 }
 244 late_initcall(omap2_common_pm_late_init);