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Linux/arch/arm/mach-omap2/pm.c

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  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 }
322 

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