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         clkdm_allow_idle(clkdm);
 114         return 0;
 115 }
 116
 117 /*
 118  * This API is to be called during init to set the various voltage
 119  * domains to the voltage as per the opp table. Typically we boot up
 120  * at the nominal voltage. So this function finds out the rate of
 121  * the clock associated with the voltage domain, finds out the correct
 122  * opp entry and sets the voltage domain to the voltage specified
 123  * in the opp entry
 124  */
 125 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
 126                                          const char *oh_name)
 127 {
 128         struct voltagedomain *voltdm;
 129         struct clk *clk;
 130         struct dev_pm_opp *opp;
 131         unsigned long freq, bootup_volt;
 132         struct device *dev;
 133
 134         if (!vdd_name || !clk_name || !oh_name) {
 135                 pr_err("%s: invalid parameters\n", __func__);
 136                 goto exit;
 137         }
 138
 139         if (!strncmp(oh_name, "mpu", 3))
 140                 /*
 141                  * All current OMAPs share voltage rail and clock
 142                  * source, so CPU0 is used to represent the MPU-SS.
 143                  */
 144                 dev = get_cpu_device(0);
 145         else
 146                 dev = omap_device_get_by_hwmod_name(oh_name);
 147
 148         if (IS_ERR(dev)) {
 149                 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
 150                         __func__, oh_name);
 151                 goto exit;
 152         }
 153
 154         voltdm = voltdm_lookup(vdd_name);
 155         if (!voltdm) {
 156                 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
 157                         __func__, vdd_name);
 158                 goto exit;
 159         }
 160
 161         clk =  clk_get(NULL, clk_name);
 162         if (IS_ERR(clk)) {
 163                 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
 164                 goto exit;
 165         }
 166
 167         freq = clk_get_rate(clk);
 168         clk_put(clk);
 169
 170         rcu_read_lock();
 171         opp = dev_pm_opp_find_freq_ceil(dev, &freq);
 172         if (IS_ERR(opp)) {
 173                 rcu_read_unlock();
 174                 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
 175                         __func__, vdd_name);
 176                 goto exit;
 177         }
 178
 179         bootup_volt = dev_pm_opp_get_voltage(opp);
 180         rcu_read_unlock();
 181         if (!bootup_volt) {
 182                 pr_err("%s: unable to find voltage corresponding to the bootup OPP for vdd_%s\n",
 183                        __func__, vdd_name);
 184                 goto exit;
 185         }
 186
 187         voltdm_scale(voltdm, bootup_volt);
 188         return 0;
 189
 190 exit:
 191         pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
 192         return -EINVAL;
 193 }
 194
 195 #ifdef CONFIG_SUSPEND
 196 static int omap_pm_enter(suspend_state_t suspend_state)
 197 {
 198         int ret = 0;
 199
 200         if (!omap_pm_suspend)
 201                 return -ENOENT; /* XXX doublecheck */
 202
 203         switch (suspend_state) {
 204         case PM_SUSPEND_STANDBY:
 205         case PM_SUSPEND_MEM:
 206                 ret = omap_pm_suspend();
 207                 break;
 208         default:
 209                 ret = -EINVAL;
 210         }
 211
 212         return ret;
 213 }
 214
 215 static int omap_pm_begin(suspend_state_t state)
 216 {
 217         cpu_idle_poll_ctrl(true);
 218         if (cpu_is_omap34xx())
 219                 omap_prcm_irq_prepare();
 220         return 0;
 221 }
 222
 223 static void omap_pm_end(void)
 224 {
 225         cpu_idle_poll_ctrl(false);
 226 }
 227
 228 static void omap_pm_finish(void)
 229 {
 230         if (cpu_is_omap34xx())
 231                 omap_prcm_irq_complete();
 232 }
 233
 234 static const struct platform_suspend_ops omap_pm_ops = {
 235         .begin          = omap_pm_begin,
 236         .end            = omap_pm_end,
 237         .enter          = omap_pm_enter,
 238         .finish         = omap_pm_finish,
 239         .valid          = suspend_valid_only_mem,
 240 };
 241
 242 /**
 243  * omap_common_suspend_init - Set common suspend routines for OMAP SoCs
 244  * @pm_suspend: function pointer to SoC specific suspend function
 245  */
 246 void omap_common_suspend_init(void *pm_suspend)
 247 {
 248         omap_pm_suspend = pm_suspend;
 249         suspend_set_ops(&omap_pm_ops);
 250 }
 251 #endif /* CONFIG_SUSPEND */
 252
 253 static void __init omap3_init_voltages(void)
 254 {
 255         if (!cpu_is_omap34xx())
 256                 return;
 257
 258         omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
 259         omap2_set_init_voltage("core", "l3_ick", "l3_main");
 260 }
 261
 262 static void __init omap4_init_voltages(void)
 263 {
 264         if (!cpu_is_omap44xx())
 265                 return;
 266
 267         omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
 268         omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
 269         omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
 270 }
 271
 272 static inline void omap_init_cpufreq(void)
 273 {
 274         struct platform_device_info devinfo = { .name = "omap-cpufreq" };
 275
 276         if (!of_have_populated_dt())
 277                 platform_device_register_full(&devinfo);
 278 }
 279
 280 static int __init omap2_common_pm_init(void)
 281 {
 282         if (!of_have_populated_dt())
 283                 omap2_init_processor_devices();
 284         omap_pm_if_init();
 285
 286         return 0;
 287 }
 288 omap_postcore_initcall(omap2_common_pm_init);
 289
 290 int __init omap2_common_pm_late_init(void)
 291 {
 292         if (of_have_populated_dt()) {
 293                 omap3_twl_init();
 294                 omap4_twl_init();
 295         }
 296
 297         /* Init the voltage layer */
 298         omap_pmic_late_init();
 299         omap_voltage_late_init();
 300
 301         /* Initialize the voltages */
 302         omap3_init_voltages();
 303         omap4_init_voltages();
 304
 305         /* Smartreflex device init */
 306         omap_devinit_smartreflex();
 307
 308         /* cpufreq dummy device instantiation */
 309         omap_init_cpufreq();
 310
 311         return 0;
 312 }