kernel/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/pm_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 #ifdef CONFIG_SUSPEND
  36 /*
  37  * omap_pm_suspend: points to a function that does the SoC-specific
  38  * suspend work
  39  */
  40 static int (*omap_pm_suspend)(void);
  41 #endif
  42
  43 #ifdef CONFIG_PM
  44 /**
  45  * struct omap2_oscillator - Describe the board main oscillator latencies
  46  * @startup_time: oscillator startup latency
  47  * @shutdown_time: oscillator shutdown latency
  48  */
  49 struct omap2_oscillator {
  50         u32 startup_time;
  51         u32 shutdown_time;
  52 };
  53
  54 static struct omap2_oscillator oscillator = {
  55         .startup_time = ULONG_MAX,
  56         .shutdown_time = ULONG_MAX,
  57 };
  58
  59 void omap_pm_setup_oscillator(u32 tstart, u32 tshut)
  60 {
  61         oscillator.startup_time = tstart;
  62         oscillator.shutdown_time = tshut;
  63 }
  64
  65 void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
  66 {
  67         if (!tstart || !tshut)
  68                 return;
  69
  70         *tstart = oscillator.startup_time;
  71         *tshut = oscillator.shutdown_time;
  72 }
  73 #endif
  74
  75 static int __init _init_omap_device(char *name)
  76 {
  77         struct omap_hwmod *oh;
  78         struct platform_device *pdev;
  79
  80         oh = omap_hwmod_lookup(name);
  81         if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
  82                  __func__, name))
  83                 return -ENODEV;
  84
  85         pdev = omap_device_build(oh->name, 0, oh, NULL, 0);
  86         if (WARN(IS_ERR(pdev), "%s: could not build omap_device for %s\n",
  87                  __func__, name))
  88                 return -ENODEV;
  89
  90         return 0;
  91 }
  92
  93 /*
  94  * Build omap_devices for processors and bus.
  95  */
  96 static void __init omap2_init_processor_devices(void)
  97 {
  98         _init_omap_device("mpu");
  99         if (omap3_has_iva())
 100                 _init_omap_device("iva");
 101
 102         if (cpu_is_omap44xx()) {
 103                 _init_omap_device("l3_main_1");
 104                 _init_omap_device("dsp");
 105                 _init_omap_device("iva");
 106         } else {
 107                 _init_omap_device("l3_main");
 108         }
 109 }
 110
 111 int __init omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
 112 {
 113         /* XXX The usecount test is racy */
 114         if ((clkdm->flags & CLKDM_CAN_ENABLE_AUTO) &&
 115             !(clkdm->flags & CLKDM_MISSING_IDLE_REPORTING))
 116                 clkdm_allow_idle(clkdm);
 117         else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
 118                  clkdm->usecount == 0)
 119                 clkdm_sleep(clkdm);
 120         return 0;
 121 }
 122
 123 /*
 124  * This API is to be called during init to set the various voltage
 125  * domains to the voltage as per the opp table. Typically we boot up
 126  * at the nominal voltage. So this function finds out the rate of
 127  * the clock associated with the voltage domain, finds out the correct
 128  * opp entry and sets the voltage domain to the voltage specified
 129  * in the opp entry
 130  */
 131 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
 132                                          const char *oh_name)
 133 {
 134         struct voltagedomain *voltdm;
 135         struct clk *clk;
 136         struct dev_pm_opp *opp;
 137         unsigned long freq, bootup_volt;
 138         struct device *dev;
 139
 140         if (!vdd_name || !clk_name || !oh_name) {
 141                 pr_err("%s: invalid parameters\n", __func__);
 142                 goto exit;
 143         }
 144
 145         if (!strncmp(oh_name, "mpu", 3))
 146                 /*
 147                  * All current OMAPs share voltage rail and clock
 148                  * source, so CPU0 is used to represent the MPU-SS.
 149                  */
 150                 dev = get_cpu_device(0);
 151         else
 152                 dev = omap_device_get_by_hwmod_name(oh_name);
 153
 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 (!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_get_rate(clk);
 174         clk_put(clk);
 175
 176         rcu_read_lock();
 177         opp = dev_pm_opp_find_freq_ceil(dev, &freq);
 178         if (IS_ERR(opp)) {
 179                 rcu_read_unlock();
 180                 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
 181                         __func__, vdd_name);
 182                 goto exit;
 183         }
 184
 185         bootup_volt = dev_pm_opp_get_voltage(opp);
 186         rcu_read_unlock();
 187         if (!bootup_volt) {
 188                 pr_err("%s: unable to find voltage corresponding to the bootup OPP for vdd_%s\n",
 189                        __func__, vdd_name);
 190                 goto exit;
 191         }
 192
 193         voltdm_scale(voltdm, bootup_volt);
 194         return 0;
 195
 196 exit:
 197         pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
 198         return -EINVAL;
 199 }
 200
 201 #ifdef CONFIG_SUSPEND
 202 static int omap_pm_enter(suspend_state_t suspend_state)
 203 {
 204         int ret = 0;
 205
 206         if (!omap_pm_suspend)
 207                 return -ENOENT; /* XXX doublecheck */
 208
 209         switch (suspend_state) {
 210         case PM_SUSPEND_STANDBY:
 211         case PM_SUSPEND_MEM:
 212                 ret = omap_pm_suspend();
 213                 break;
 214         default:
 215                 ret = -EINVAL;
 216         }
 217
 218         return ret;
 219 }
 220
 221 static int omap_pm_begin(suspend_state_t state)
 222 {
 223         cpu_idle_poll_ctrl(true);
 224         if (cpu_is_omap34xx())
 225                 omap_prcm_irq_prepare();
 226         return 0;
 227 }
 228
 229 static void omap_pm_end(void)
 230 {
 231         cpu_idle_poll_ctrl(false);
 232 }
 233
 234 static void omap_pm_finish(void)
 235 {
 236         if (cpu_is_omap34xx())
 237                 omap_prcm_irq_complete();
 238 }
 239
 240 static const struct platform_suspend_ops omap_pm_ops = {
 241         .begin          = omap_pm_begin,
 242         .end            = omap_pm_end,
 243         .enter          = omap_pm_enter,
 244         .finish         = omap_pm_finish,
 245         .valid          = suspend_valid_only_mem,
 246 };
 247
 248 /**
 249  * omap_common_suspend_init - Set common suspend routines for OMAP SoCs
 250  * @pm_suspend: function pointer to SoC specific suspend function
 251  */
 252 void omap_common_suspend_init(void *pm_suspend)
 253 {
 254         omap_pm_suspend = pm_suspend;
 255         suspend_set_ops(&omap_pm_ops);
 256 }
 257 #endif /* CONFIG_SUSPEND */
 258
 259 static void __init omap3_init_voltages(void)
 260 {
 261         if (!cpu_is_omap34xx())
 262                 return;
 263
 264         omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
 265         omap2_set_init_voltage("core", "l3_ick", "l3_main");
 266 }
 267
 268 static void __init omap4_init_voltages(void)
 269 {
 270         if (!cpu_is_omap44xx())
 271                 return;
 272
 273         omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
 274         omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
 275         omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
 276 }
 277
 278 static inline void omap_init_cpufreq(void)
 279 {
 280         struct platform_device_info devinfo = { };
 281
 282         if (!of_have_populated_dt())
 283                 devinfo.name = "omap-cpufreq";
 284         else
 285                 devinfo.name = "cpufreq-dt";
 286         platform_device_register_full(&devinfo);
 287 }
 288
 289 static int __init omap2_common_pm_init(void)
 290 {
 291         if (!of_have_populated_dt())
 292                 omap2_init_processor_devices();
 293         omap_pm_if_init();
 294
 295         return 0;
 296 }
 297 omap_postcore_initcall(omap2_common_pm_init);
 298
 299 int __init omap2_common_pm_late_init(void)
 300 {
 301         if (of_have_populated_dt()) {
 302                 omap3_twl_init();
 303                 omap4_twl_init();
 304         }
 305
 306         /* Init the voltage layer */
 307         omap_pmic_late_init();
 308         omap_voltage_late_init();
 309
 310         /* Initialize the voltages */
 311         omap3_init_voltages();
 312         omap4_init_voltages();
 313
 314         /* Smartreflex device init */
 315         omap_devinit_smartreflex();
 316
 317         /* cpufreq dummy device instantiation */
 318         omap_init_cpufreq();
 319
 320         return 0;
 321 }