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 #include <linux/cpu.h>
  20
  21 #include <asm/system_misc.h>
  22
  23 #include "omap-pm.h"
  24 #include "omap_device.h"
  25 #include "common.h"
  26
  27 #include "soc.h"
  28 #include "prcm-common.h"
  29 #include "voltage.h"
  30 #include "powerdomain.h"
  31 #include "clockdomain.h"
  32 #include "pm.h"
  33 #include "twl-common.h"
  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 #ifdef CONFIG_PM
  42 /**
  43  * struct omap2_oscillator - Describe the board main oscillator latencies
  44  * @startup_time: oscillator startup latency
  45  * @shutdown_time: oscillator shutdown latency
  46  */
  47 struct omap2_oscillator {
  48         u32 startup_time;
  49         u32 shutdown_time;
  50 };
  51
  52 static struct omap2_oscillator oscillator = {
  53         .startup_time = ULONG_MAX,
  54         .shutdown_time = ULONG_MAX,
  55 };
  56
  57 void omap_pm_setup_oscillator(u32 tstart, u32 tshut)
  58 {
  59         oscillator.startup_time = tstart;
  60         oscillator.shutdown_time = tshut;
  61 }
  62
  63 void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
  64 {
  65         if (!tstart || !tshut)
  66                 return;
  67
  68         *tstart = oscillator.startup_time;
  69         *tshut = oscillator.shutdown_time;
  70 }
  71 #endif
  72
  73 static int __init _init_omap_device(char *name)
  74 {
  75         struct omap_hwmod *oh;
  76         struct platform_device *pdev;
  77
  78         oh = omap_hwmod_lookup(name);
  79         if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
  80                  __func__, name))
  81                 return -ENODEV;
  82
  83         pdev = omap_device_build(oh->name, 0, oh, NULL, 0);
  84         if (WARN(IS_ERR(pdev), "%s: could not build omap_device for %s\n",
  85                  __func__, name))
  86                 return -ENODEV;
  87
  88         return 0;
  89 }
  90
  91 /*
  92  * Build omap_devices for processors and bus.
  93  */
  94 static void __init omap2_init_processor_devices(void)
  95 {
  96         _init_omap_device("mpu");
  97         if (omap3_has_iva())
  98                 _init_omap_device("iva");
  99
 100         if (cpu_is_omap44xx()) {
 101                 _init_omap_device("l3_main_1");
 102                 _init_omap_device("dsp");
 103                 _init_omap_device("iva");
 104         } else {
 105                 _init_omap_device("l3_main");
 106         }
 107 }
 108
 109 int __init omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
 110 {
 111         /* XXX The usecount test is racy */
 112         if ((clkdm->flags & CLKDM_CAN_ENABLE_AUTO) &&
 113             !(clkdm->flags & CLKDM_MISSING_IDLE_REPORTING))
 114                 clkdm_allow_idle(clkdm);
 115         else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
 116                  clkdm->usecount == 0)
 117                 clkdm_sleep(clkdm);
 118         return 0;
 119 }
 120
 121 /*
 122  * This API is to be called during init to set the various voltage
 123  * domains to the voltage as per the opp table. Typically we boot up
 124  * at the nominal voltage. So this function finds out the rate of
 125  * the clock associated with the voltage domain, finds out the correct
 126  * opp entry and sets the voltage domain to the voltage specified
 127  * in the opp entry
 128  */
 129 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
 130                                          const char *oh_name)
 131 {
 132         struct voltagedomain *voltdm;
 133         struct clk *clk;
 134         struct opp *opp;
 135         unsigned long freq, bootup_volt;
 136         struct device *dev;
 137
 138         if (!vdd_name || !clk_name || !oh_name) {
 139                 pr_err("%s: invalid parameters\n", __func__);
 140                 goto exit;
 141         }
 142
 143         if (!strncmp(oh_name, "mpu", 3))
 144                 /*
 145                  * All current OMAPs share voltage rail and clock
 146                  * source, so CPU0 is used to represent the MPU-SS.
 147                  */
 148                 dev = get_cpu_device(0);
 149         else
 150                 dev = omap_device_get_by_hwmod_name(oh_name);
 151
 152         if (IS_ERR(dev)) {
 153                 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
 154                         __func__, oh_name);
 155                 goto exit;
 156         }
 157
 158         voltdm = voltdm_lookup(vdd_name);
 159         if (!voltdm) {
 160                 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
 161                         __func__, vdd_name);
 162                 goto exit;
 163         }
 164
 165         clk =  clk_get(NULL, clk_name);
 166         if (IS_ERR(clk)) {
 167                 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
 168                 goto exit;
 169         }
 170
 171         freq = clk_get_rate(clk);
 172         clk_put(clk);
 173
 174         rcu_read_lock();
 175         opp = opp_find_freq_ceil(dev, &freq);
 176         if (IS_ERR(opp)) {
 177                 rcu_read_unlock();
 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         rcu_read_unlock();
 185         if (!bootup_volt) {
 186                 pr_err("%s: unable to find voltage corresponding to the bootup OPP for vdd_%s\n",
 187                        __func__, vdd_name);
 188                 goto exit;
 189         }
 190
 191         voltdm_scale(voltdm, bootup_volt);
 192         return 0;
 193
 194 exit:
 195         pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
 196         return -EINVAL;
 197 }
 198
 199 #ifdef CONFIG_SUSPEND
 200 static int omap_pm_enter(suspend_state_t suspend_state)
 201 {
 202         int ret = 0;
 203
 204         if (!omap_pm_suspend)
 205                 return -ENOENT; /* XXX doublecheck */
 206
 207         switch (suspend_state) {
 208         case PM_SUSPEND_STANDBY:
 209         case PM_SUSPEND_MEM:
 210                 ret = omap_pm_suspend();
 211                 break;
 212         default:
 213                 ret = -EINVAL;
 214         }
 215
 216         return ret;
 217 }
 218
 219 static int omap_pm_begin(suspend_state_t state)
 220 {
 221         cpu_idle_poll_ctrl(true);
 222         if (cpu_is_omap34xx())
 223                 omap_prcm_irq_prepare();
 224         return 0;
 225 }
 226
 227 static void omap_pm_end(void)
 228 {
 229         cpu_idle_poll_ctrl(false);
 230 }
 231
 232 static void omap_pm_finish(void)
 233 {
 234         if (cpu_is_omap34xx())
 235                 omap_prcm_irq_complete();
 236 }
 237
 238 static const struct platform_suspend_ops omap_pm_ops = {
 239         .begin          = omap_pm_begin,
 240         .end            = omap_pm_end,
 241         .enter          = omap_pm_enter,
 242         .finish         = omap_pm_finish,
 243         .valid          = suspend_valid_only_mem,
 244 };
 245
 246 #endif /* CONFIG_SUSPEND */
 247
 248 static void __init omap3_init_voltages(void)
 249 {
 250         if (!cpu_is_omap34xx())
 251                 return;
 252
 253         omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
 254         omap2_set_init_voltage("core", "l3_ick", "l3_main");
 255 }
 256
 257 static void __init omap4_init_voltages(void)
 258 {
 259         if (!cpu_is_omap44xx())
 260                 return;
 261
 262         omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
 263         omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
 264         omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
 265 }
 266
 267 static int __init omap2_common_pm_init(void)
 268 {
 269         if (!of_have_populated_dt())
 270                 omap2_init_processor_devices();
 271         omap_pm_if_init();
 272
 273         return 0;
 274 }
 275 omap_postcore_initcall(omap2_common_pm_init);
 276
 277 int __init omap2_common_pm_late_init(void)
 278 {
 279         /*
 280          * In the case of DT, the PMIC and SR initialization will be done using
 281          * a completely different mechanism.
 282          * Disable this part if a DT blob is available.
 283          */
 284         if (!of_have_populated_dt()) {
 285
 286                 /* Init the voltage layer */
 287                 omap_pmic_late_init();
 288                 omap_voltage_late_init();
 289
 290                 /* Initialize the voltages */
 291                 omap3_init_voltages();
 292                 omap4_init_voltages();
 293
 294                 /* Smartreflex device init */
 295                 omap_devinit_smartreflex();
 296         }
 297
 298 #ifdef CONFIG_SUSPEND
 299         suspend_set_ops(&omap_pm_ops);
 300 #endif
 301
 302         return 0;
 303 }