[SCSI] bnx2i: Fixed the endian on TTT for NOP out transmission
[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                         pwrdm_wait_transition(pwrdm);
134                         sleep_switch = FORCEWAKEUP_SWITCH;
135                 }
136         }
137
138         ret = pwrdm_set_next_pwrst(pwrdm, state);
139         if (ret) {
140                 printk(KERN_ERR "Unable to set state of powerdomain: %s\n",
141                        pwrdm->name);
142                 goto err;
143         }
144
145         switch (sleep_switch) {
146         case FORCEWAKEUP_SWITCH:
147                 if (hwsup)
148                         clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
149                 else
150                         clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
151                 break;
152         case LOWPOWERSTATE_SWITCH:
153                 pwrdm_set_lowpwrstchange(pwrdm);
154                 break;
155         default:
156                 return ret;
157         }
158
159         pwrdm_wait_transition(pwrdm);
160         pwrdm_state_switch(pwrdm);
161 err:
162         return ret;
163 }
164
165 /*
166  * This API is to be called during init to put the various voltage
167  * domains to the voltage as per the opp table. Typically we boot up
168  * at the nominal voltage. So this function finds out the rate of
169  * the clock associated with the voltage domain, finds out the correct
170  * opp entry and puts the voltage domain to the voltage specifies
171  * in the opp entry
172  */
173 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
174                                                 struct device *dev)
175 {
176         struct voltagedomain *voltdm;
177         struct clk *clk;
178         struct opp *opp;
179         unsigned long freq, bootup_volt;
180
181         if (!vdd_name || !clk_name || !dev) {
182                 printk(KERN_ERR "%s: Invalid parameters!\n", __func__);
183                 goto exit;
184         }
185
186         voltdm = omap_voltage_domain_lookup(vdd_name);
187         if (IS_ERR(voltdm)) {
188                 printk(KERN_ERR "%s: Unable to get vdd pointer for vdd_%s\n",
189                         __func__, vdd_name);
190                 goto exit;
191         }
192
193         clk =  clk_get(NULL, clk_name);
194         if (IS_ERR(clk)) {
195                 printk(KERN_ERR "%s: unable to get clk %s\n",
196                         __func__, clk_name);
197                 goto exit;
198         }
199
200         freq = clk->rate;
201         clk_put(clk);
202
203         opp = opp_find_freq_ceil(dev, &freq);
204         if (IS_ERR(opp)) {
205                 printk(KERN_ERR "%s: unable to find boot up OPP for vdd_%s\n",
206                         __func__, vdd_name);
207                 goto exit;
208         }
209
210         bootup_volt = opp_get_voltage(opp);
211         if (!bootup_volt) {
212                 printk(KERN_ERR "%s: unable to find voltage corresponding"
213                         "to the bootup OPP for vdd_%s\n", __func__, vdd_name);
214                 goto exit;
215         }
216
217         omap_voltage_scale_vdd(voltdm, bootup_volt);
218         return 0;
219
220 exit:
221         printk(KERN_ERR "%s: Unable to put vdd_%s to its init voltage\n\n",
222                 __func__, vdd_name);
223         return -EINVAL;
224 }
225
226 static void __init omap3_init_voltages(void)
227 {
228         if (!cpu_is_omap34xx())
229                 return;
230
231         omap2_set_init_voltage("mpu", "dpll1_ck", mpu_dev);
232         omap2_set_init_voltage("core", "l3_ick", l3_dev);
233 }
234
235 static void __init omap4_init_voltages(void)
236 {
237         if (!cpu_is_omap44xx())
238                 return;
239
240         omap2_set_init_voltage("mpu", "dpll_mpu_ck", mpu_dev);
241         omap2_set_init_voltage("core", "l3_div_ck", l3_dev);
242         omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", iva_dev);
243 }
244
245 static int __init omap2_common_pm_init(void)
246 {
247         omap2_init_processor_devices();
248         omap_pm_if_init();
249
250         return 0;
251 }
252 postcore_initcall(omap2_common_pm_init);
253
254 static int __init omap2_common_pm_late_init(void)
255 {
256         /* Init the OMAP TWL parameters */
257         omap3_twl_init();
258         omap4_twl_init();
259
260         /* Init the voltage layer */
261         omap_voltage_late_init();
262
263         /* Initialize the voltages */
264         omap3_init_voltages();
265         omap4_init_voltages();
266
267         /* Smartreflex device init */
268         omap_devinit_smartreflex();
269
270         return 0;
271 }
272 late_initcall(omap2_common_pm_late_init);