Merge tag 'dt' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[~shefty/rdma-dev.git] / 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
20 #include <plat/omap-pm.h>
21 #include <plat/omap_device.h>
22 #include "common.h"
23
24 #include "prcm-common.h"
25 #include "voltage.h"
26 #include "powerdomain.h"
27 #include "clockdomain.h"
28 #include "pm.h"
29 #include "twl-common.h"
30
31 static struct omap_device_pm_latency *pm_lats;
32
33 /*
34  * omap_pm_suspend: points to a function that does the SoC-specific
35  * suspend work
36  */
37 int (*omap_pm_suspend)(void);
38
39 static int __init _init_omap_device(char *name)
40 {
41         struct omap_hwmod *oh;
42         struct platform_device *pdev;
43
44         oh = omap_hwmod_lookup(name);
45         if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
46                  __func__, name))
47                 return -ENODEV;
48
49         pdev = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
50         if (WARN(IS_ERR(pdev), "%s: could not build omap_device for %s\n",
51                  __func__, name))
52                 return -ENODEV;
53
54         return 0;
55 }
56
57 /*
58  * Build omap_devices for processors and bus.
59  */
60 static void __init omap2_init_processor_devices(void)
61 {
62         _init_omap_device("mpu");
63         if (omap3_has_iva())
64                 _init_omap_device("iva");
65
66         if (cpu_is_omap44xx()) {
67                 _init_omap_device("l3_main_1");
68                 _init_omap_device("dsp");
69                 _init_omap_device("iva");
70         } else {
71                 _init_omap_device("l3_main");
72         }
73 }
74
75 /* Types of sleep_switch used in omap_set_pwrdm_state */
76 #define FORCEWAKEUP_SWITCH      0
77 #define LOWPOWERSTATE_SWITCH    1
78
79 int __init omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
80 {
81         if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
82                 clkdm_allow_idle(clkdm);
83         else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
84                  atomic_read(&clkdm->usecount) == 0)
85                 clkdm_sleep(clkdm);
86         return 0;
87 }
88
89 /*
90  * This sets pwrdm state (other than mpu & core. Currently only ON &
91  * RET are supported.
92  */
93 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 pwrst)
94 {
95         u8 curr_pwrst, next_pwrst;
96         int sleep_switch = -1, ret = 0, hwsup = 0;
97
98         if (!pwrdm || IS_ERR(pwrdm))
99                 return -EINVAL;
100
101         while (!(pwrdm->pwrsts & (1 << pwrst))) {
102                 if (pwrst == PWRDM_POWER_OFF)
103                         return ret;
104                 pwrst--;
105         }
106
107         next_pwrst = pwrdm_read_next_pwrst(pwrdm);
108         if (next_pwrst == pwrst)
109                 return ret;
110
111         curr_pwrst = pwrdm_read_pwrst(pwrdm);
112         if (curr_pwrst < PWRDM_POWER_ON) {
113                 if ((curr_pwrst > pwrst) &&
114                         (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
115                         sleep_switch = LOWPOWERSTATE_SWITCH;
116                 } else {
117                         hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
118                         clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
119                         sleep_switch = FORCEWAKEUP_SWITCH;
120                 }
121         }
122
123         ret = pwrdm_set_next_pwrst(pwrdm, pwrst);
124         if (ret)
125                 pr_err("%s: unable to set power state of powerdomain: %s\n",
126                        __func__, pwrdm->name);
127
128         switch (sleep_switch) {
129         case FORCEWAKEUP_SWITCH:
130                 if (hwsup)
131                         clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
132                 else
133                         clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
134                 break;
135         case LOWPOWERSTATE_SWITCH:
136                 pwrdm_set_lowpwrstchange(pwrdm);
137                 pwrdm_wait_transition(pwrdm);
138                 pwrdm_state_switch(pwrdm);
139                 break;
140         }
141
142         return ret;
143 }
144
145
146
147 /*
148  * This API is to be called during init to set the various voltage
149  * domains to the voltage as per the opp table. Typically we boot up
150  * at the nominal voltage. So this function finds out the rate of
151  * the clock associated with the voltage domain, finds out the correct
152  * opp entry and sets the voltage domain to the voltage specified
153  * in the opp entry
154  */
155 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
156                                          const char *oh_name)
157 {
158         struct voltagedomain *voltdm;
159         struct clk *clk;
160         struct opp *opp;
161         unsigned long freq, bootup_volt;
162         struct device *dev;
163
164         if (!vdd_name || !clk_name || !oh_name) {
165                 pr_err("%s: invalid parameters\n", __func__);
166                 goto exit;
167         }
168
169         dev = omap_device_get_by_hwmod_name(oh_name);
170         if (IS_ERR(dev)) {
171                 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
172                         __func__, oh_name);
173                 goto exit;
174         }
175
176         voltdm = voltdm_lookup(vdd_name);
177         if (IS_ERR(voltdm)) {
178                 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
179                         __func__, vdd_name);
180                 goto exit;
181         }
182
183         clk =  clk_get(NULL, clk_name);
184         if (IS_ERR(clk)) {
185                 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
186                 goto exit;
187         }
188
189         freq = clk->rate;
190         clk_put(clk);
191
192         rcu_read_lock();
193         opp = opp_find_freq_ceil(dev, &freq);
194         if (IS_ERR(opp)) {
195                 rcu_read_unlock();
196                 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
197                         __func__, vdd_name);
198                 goto exit;
199         }
200
201         bootup_volt = opp_get_voltage(opp);
202         rcu_read_unlock();
203         if (!bootup_volt) {
204                 pr_err("%s: unable to find voltage corresponding "
205                         "to the bootup OPP for vdd_%s\n", __func__, vdd_name);
206                 goto exit;
207         }
208
209         voltdm_scale(voltdm, bootup_volt);
210         return 0;
211
212 exit:
213         pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
214         return -EINVAL;
215 }
216
217 #ifdef CONFIG_SUSPEND
218 static int omap_pm_enter(suspend_state_t suspend_state)
219 {
220         int ret = 0;
221
222         if (!omap_pm_suspend)
223                 return -ENOENT; /* XXX doublecheck */
224
225         switch (suspend_state) {
226         case PM_SUSPEND_STANDBY:
227         case PM_SUSPEND_MEM:
228                 ret = omap_pm_suspend();
229                 break;
230         default:
231                 ret = -EINVAL;
232         }
233
234         return ret;
235 }
236
237 static int omap_pm_begin(suspend_state_t state)
238 {
239         disable_hlt();
240         if (cpu_is_omap34xx())
241                 omap_prcm_irq_prepare();
242         return 0;
243 }
244
245 static void omap_pm_end(void)
246 {
247         enable_hlt();
248         return;
249 }
250
251 static void omap_pm_finish(void)
252 {
253         if (cpu_is_omap34xx())
254                 omap_prcm_irq_complete();
255 }
256
257 static const struct platform_suspend_ops omap_pm_ops = {
258         .begin          = omap_pm_begin,
259         .end            = omap_pm_end,
260         .enter          = omap_pm_enter,
261         .finish         = omap_pm_finish,
262         .valid          = suspend_valid_only_mem,
263 };
264
265 #endif /* CONFIG_SUSPEND */
266
267 static void __init omap3_init_voltages(void)
268 {
269         if (!cpu_is_omap34xx())
270                 return;
271
272         omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
273         omap2_set_init_voltage("core", "l3_ick", "l3_main");
274 }
275
276 static void __init omap4_init_voltages(void)
277 {
278         if (!cpu_is_omap44xx())
279                 return;
280
281         omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
282         omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
283         omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
284 }
285
286 static int __init omap2_common_pm_init(void)
287 {
288         if (!of_have_populated_dt())
289                 omap2_init_processor_devices();
290         omap_pm_if_init();
291
292         return 0;
293 }
294 postcore_initcall(omap2_common_pm_init);
295
296 static int __init omap2_common_pm_late_init(void)
297 {
298         /*
299          * In the case of DT, the PMIC and SR initialization will be done using
300          * a completely different mechanism.
301          * Disable this part if a DT blob is available.
302          */
303         if (of_have_populated_dt())
304                 return 0;
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 #ifdef CONFIG_SUSPEND
318         suspend_set_ops(&omap_pm_ops);
319 #endif
320
321         return 0;
322 }
323 late_initcall(omap2_common_pm_late_init);