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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/clk.h>
 20 #include <linux/cpu.h>
 21 
 22 #include <asm/system_misc.h>
 23 
 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 
 34 #ifdef CONFIG_SUSPEND
 35 /*
 36  * omap_pm_suspend: points to a function that does the SoC-specific
 37  * suspend work
 38  */
 39 static int (*omap_pm_suspend)(void);
 40 #endif
 41 
 42 #ifdef CONFIG_PM
 43 /**
 44  * struct omap2_oscillator - Describe the board main oscillator latencies
 45  * @startup_time: oscillator startup latency
 46  * @shutdown_time: oscillator shutdown latency
 47  */
 48 struct omap2_oscillator {
 49         u32 startup_time;
 50         u32 shutdown_time;
 51 };
 52 
 53 static struct omap2_oscillator oscillator = {
 54         .startup_time = ULONG_MAX,
 55         .shutdown_time = ULONG_MAX,
 56 };
 57 
 58 void omap_pm_setup_oscillator(u32 tstart, u32 tshut)
 59 {
 60         oscillator.startup_time = tstart;
 61         oscillator.shutdown_time = tshut;
 62 }
 63 
 64 void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
 65 {
 66         if (!tstart || !tshut)
 67                 return;
 68 
 69         *tstart = oscillator.startup_time;
 70         *tshut = oscillator.shutdown_time;
 71 }
 72 #endif
 73 
 74 int omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
 75 {
 76         clkdm_allow_idle(clkdm);
 77         return 0;
 78 }
 79 
 80 /*
 81  * This API is to be called during init to set the various voltage
 82  * domains to the voltage as per the opp table. Typically we boot up
 83  * at the nominal voltage. So this function finds out the rate of
 84  * the clock associated with the voltage domain, finds out the correct
 85  * opp entry and sets the voltage domain to the voltage specified
 86  * in the opp entry
 87  */
 88 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
 89                                          const char *oh_name)
 90 {
 91         struct voltagedomain *voltdm;
 92         struct clk *clk;
 93         struct dev_pm_opp *opp;
 94         unsigned long freq, bootup_volt;
 95         struct device *dev;
 96 
 97         if (!vdd_name || !clk_name || !oh_name) {
 98                 pr_err("%s: invalid parameters\n", __func__);
 99                 goto exit;
100         }
101 
102         if (!strncmp(oh_name, "mpu", 3))
103                 /* 
104                  * All current OMAPs share voltage rail and clock
105                  * source, so CPU0 is used to represent the MPU-SS.
106                  */
107                 dev = get_cpu_device(0);
108         else
109                 dev = omap_device_get_by_hwmod_name(oh_name);
110 
111         if (IS_ERR(dev)) {
112                 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
113                         __func__, oh_name);
114                 goto exit;
115         }
116 
117         voltdm = voltdm_lookup(vdd_name);
118         if (!voltdm) {
119                 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
120                         __func__, vdd_name);
121                 goto exit;
122         }
123 
124         clk =  clk_get(NULL, clk_name);
125         if (IS_ERR(clk)) {
126                 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
127                 goto exit;
128         }
129 
130         freq = clk_get_rate(clk);
131         clk_put(clk);
132 
133         opp = dev_pm_opp_find_freq_ceil(dev, &freq);
134         if (IS_ERR(opp)) {
135                 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
136                         __func__, vdd_name);
137                 goto exit;
138         }
139 
140         bootup_volt = dev_pm_opp_get_voltage(opp);
141         dev_pm_opp_put(opp);
142 
143         if (!bootup_volt) {
144                 pr_err("%s: unable to find voltage corresponding to the bootup OPP for vdd_%s\n",
145                        __func__, vdd_name);
146                 goto exit;
147         }
148 
149         voltdm_scale(voltdm, bootup_volt);
150         return 0;
151 
152 exit:
153         pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
154         return -EINVAL;
155 }
156 
157 #ifdef CONFIG_SUSPEND
158 static int omap_pm_enter(suspend_state_t suspend_state)
159 {
160         int ret = 0;
161 
162         if (!omap_pm_suspend)
163                 return -ENOENT; /* XXX doublecheck */
164 
165         switch (suspend_state) {
166         case PM_SUSPEND_MEM:
167                 ret = omap_pm_suspend();
168                 break;
169         default:
170                 ret = -EINVAL;
171         }
172 
173         return ret;
174 }
175 
176 static int omap_pm_begin(suspend_state_t state)
177 {
178         cpu_idle_poll_ctrl(true);
179         if (soc_is_omap34xx())
180                 omap_prcm_irq_prepare();
181         return 0;
182 }
183 
184 static void omap_pm_end(void)
185 {
186         cpu_idle_poll_ctrl(false);
187 }
188 
189 static void omap_pm_wake(void)
190 {
191         if (soc_is_omap34xx())
192                 omap_prcm_irq_complete();
193 }
194 
195 static const struct platform_suspend_ops omap_pm_ops = {
196         .begin          = omap_pm_begin,
197         .end            = omap_pm_end,
198         .enter          = omap_pm_enter,
199         .wake           = omap_pm_wake,
200         .valid          = suspend_valid_only_mem,
201 };
202 
203 /**
204  * omap_common_suspend_init - Set common suspend routines for OMAP SoCs
205  * @pm_suspend: function pointer to SoC specific suspend function
206  */
207 void omap_common_suspend_init(void *pm_suspend)
208 {
209         omap_pm_suspend = pm_suspend;
210         suspend_set_ops(&omap_pm_ops);
211 }
212 #endif /* CONFIG_SUSPEND */
213 
214 static void __init omap3_init_voltages(void)
215 {
216         if (!soc_is_omap34xx())
217                 return;
218 
219         omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
220         omap2_set_init_voltage("core", "l3_ick", "l3_main");
221 }
222 
223 static void __init omap4_init_voltages(void)
224 {
225         if (!soc_is_omap44xx())
226                 return;
227 
228         omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
229         omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
230         omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
231 }
232 
233 int __maybe_unused omap_pm_nop_init(void)
234 {
235         return 0;
236 }
237 
238 int (*omap_pm_soc_init)(void);
239 
240 int __init omap2_common_pm_late_init(void)
241 {
242         int error;
243 
244         if (!omap_pm_soc_init)
245                 return 0;
246 
247         /* Init the voltage layer */
248         omap3_twl_init();
249         omap4_twl_init();
250         omap_voltage_late_init();
251 
252         /* Initialize the voltages */
253         omap3_init_voltages();
254         omap4_init_voltages();
255 
256         /* Smartreflex device init */
257         omap_devinit_smartreflex();
258 
259         error = omap_pm_soc_init();
260         if (error)
261                 pr_warn("%s: pm soc init failed: %i\n", __func__, error);
262 
263         omap2_clk_enable_autoidle_all();
264 
265         return 0;
266 }
267 omap_late_initcall(omap2_common_pm_late_init);
268 

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