Merge git://bedivere.hansenpartnership.com/git/scsi-rc-fixes-2.6
[linux-2.6.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
18 #include <plat/omap-pm.h>
19 #include <plat/omap_device.h>
20 #include <plat/common.h>
21
22 #include "voltage.h"
23 #include "powerdomain.h"
24 #include "clockdomain.h"
25 #include "pm.h"
26
27 static struct omap_device_pm_latency *pm_lats;
28
29 static struct device *mpu_dev;
30 static struct device *iva_dev;
31 static struct device *l3_dev;
32 static struct device *dsp_dev;
33
34 struct device *omap2_get_mpuss_device(void)
35 {
36         WARN_ON_ONCE(!mpu_dev);
37         return mpu_dev;
38 }
39
40 struct device *omap2_get_iva_device(void)
41 {
42         WARN_ON_ONCE(!iva_dev);
43         return iva_dev;
44 }
45
46 struct device *omap2_get_l3_device(void)
47 {
48         WARN_ON_ONCE(!l3_dev);
49         return l3_dev;
50 }
51
52 struct device *omap4_get_dsp_device(void)
53 {
54         WARN_ON_ONCE(!dsp_dev);
55         return dsp_dev;
56 }
57 EXPORT_SYMBOL(omap4_get_dsp_device);
58
59 /* static int _init_omap_device(struct omap_hwmod *oh, void *user) */
60 static int _init_omap_device(char *name, struct device **new_dev)
61 {
62         struct omap_hwmod *oh;
63         struct omap_device *od;
64
65         oh = omap_hwmod_lookup(name);
66         if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
67                  __func__, name))
68                 return -ENODEV;
69
70         od = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
71         if (WARN(IS_ERR(od), "%s: could not build omap_device for %s\n",
72                  __func__, name))
73                 return -ENODEV;
74
75         *new_dev = &od->pdev.dev;
76
77         return 0;
78 }
79
80 /*
81  * Build omap_devices for processors and bus.
82  */
83 static void omap2_init_processor_devices(void)
84 {
85         _init_omap_device("mpu", &mpu_dev);
86         if (omap3_has_iva())
87                 _init_omap_device("iva", &iva_dev);
88
89         if (cpu_is_omap44xx()) {
90                 _init_omap_device("l3_main_1", &l3_dev);
91                 _init_omap_device("dsp", &dsp_dev);
92                 _init_omap_device("iva", &iva_dev);
93         } else {
94                 _init_omap_device("l3_main", &l3_dev);
95         }
96 }
97
98 /* Types of sleep_switch used in omap_set_pwrdm_state */
99 #define FORCEWAKEUP_SWITCH      0
100 #define LOWPOWERSTATE_SWITCH    1
101
102 /*
103  * This sets pwrdm state (other than mpu & core. Currently only ON &
104  * RET are supported.
105  */
106 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
107 {
108         u32 cur_state;
109         int sleep_switch = -1;
110         int ret = 0;
111         int hwsup = 0;
112
113         if (pwrdm == NULL || IS_ERR(pwrdm))
114                 return -EINVAL;
115
116         while (!(pwrdm->pwrsts & (1 << state))) {
117                 if (state == PWRDM_POWER_OFF)
118                         return ret;
119                 state--;
120         }
121
122         cur_state = pwrdm_read_next_pwrst(pwrdm);
123         if (cur_state == state)
124                 return ret;
125
126         if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
127                 if ((pwrdm_read_pwrst(pwrdm) > state) &&
128                         (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
129                         sleep_switch = LOWPOWERSTATE_SWITCH;
130                 } else {
131                         hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
132                         clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
133                         sleep_switch = FORCEWAKEUP_SWITCH;
134                 }
135         }
136
137         ret = pwrdm_set_next_pwrst(pwrdm, state);
138         if (ret) {
139                 printk(KERN_ERR "Unable to set state of powerdomain: %s\n",
140                        pwrdm->name);
141                 goto err;
142         }
143
144         switch (sleep_switch) {
145         case FORCEWAKEUP_SWITCH:
146                 if (hwsup)
147                         clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
148                 else
149                         clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
150                 break;
151         case LOWPOWERSTATE_SWITCH:
152                 pwrdm_set_lowpwrstchange(pwrdm);
153                 break;
154         default:
155                 return ret;
156         }
157
158         pwrdm_state_switch(pwrdm);
159 err:
160         return ret;
161 }
162
163 /*
164  * This API is to be called during init to put the various voltage
165  * domains to the voltage as per the opp table. Typically we boot up
166  * at the nominal voltage. So this function finds out the rate of
167  * the clock associated with the voltage domain, finds out the correct
168  * opp entry and puts the voltage domain to the voltage specifies
169  * in the opp entry
170  */
171 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
172                                                 struct device *dev)
173 {
174         struct voltagedomain *voltdm;
175         struct clk *clk;
176         struct opp *opp;
177         unsigned long freq, bootup_volt;
178
179         if (!vdd_name || !clk_name || !dev) {
180                 printk(KERN_ERR "%s: Invalid parameters!\n", __func__);
181                 goto exit;
182         }
183
184         voltdm = omap_voltage_domain_lookup(vdd_name);
185         if (IS_ERR(voltdm)) {
186                 printk(KERN_ERR "%s: Unable to get vdd pointer for vdd_%s\n",
187                         __func__, vdd_name);
188                 goto exit;
189         }
190
191         clk =  clk_get(NULL, clk_name);
192         if (IS_ERR(clk)) {
193                 printk(KERN_ERR "%s: unable to get clk %s\n",
194                         __func__, clk_name);
195                 goto exit;
196         }
197
198         freq = clk->rate;
199         clk_put(clk);
200
201         opp = opp_find_freq_ceil(dev, &freq);
202         if (IS_ERR(opp)) {
203                 printk(KERN_ERR "%s: unable to find boot up OPP for vdd_%s\n",
204                         __func__, vdd_name);
205                 goto exit;
206         }
207
208         bootup_volt = opp_get_voltage(opp);
209         if (!bootup_volt) {
210                 printk(KERN_ERR "%s: unable to find voltage corresponding"
211                         "to the bootup OPP for vdd_%s\n", __func__, vdd_name);
212                 goto exit;
213         }
214
215         omap_voltage_scale_vdd(voltdm, bootup_volt);
216         return 0;
217
218 exit:
219         printk(KERN_ERR "%s: Unable to put vdd_%s to its init voltage\n\n",
220                 __func__, vdd_name);
221         return -EINVAL;
222 }
223
224 static void __init omap3_init_voltages(void)
225 {
226         if (!cpu_is_omap34xx())
227                 return;
228
229         omap2_set_init_voltage("mpu", "dpll1_ck", mpu_dev);
230         omap2_set_init_voltage("core", "l3_ick", l3_dev);
231 }
232
233 static void __init omap4_init_voltages(void)
234 {
235         if (!cpu_is_omap44xx())
236                 return;
237
238         omap2_set_init_voltage("mpu", "dpll_mpu_ck", mpu_dev);
239         omap2_set_init_voltage("core", "l3_div_ck", l3_dev);
240         omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", iva_dev);
241 }
242
243 static int __init omap2_common_pm_init(void)
244 {
245         omap2_init_processor_devices();
246         omap_pm_if_init();
247
248         return 0;
249 }
250 postcore_initcall(omap2_common_pm_init);
251
252 static int __init omap2_common_pm_late_init(void)
253 {
254         /* Init the OMAP TWL parameters */
255         omap3_twl_init();
256         omap4_twl_init();
257
258         /* Init the voltage layer */
259         omap_voltage_late_init();
260
261         /* Initialize the voltages */
262         omap3_init_voltages();
263         omap4_init_voltages();
264
265         /* Smartreflex device init */
266         omap_devinit_smartreflex();
267
268         return 0;
269 }
270 late_initcall(omap2_common_pm_late_init);