2 * pm.c - Common OMAP2+ power management-related code
4 * Copyright (C) 2010 Texas Instruments, Inc.
5 * Copyright (C) 2010 Nokia Corporation
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.
12 #include <linux/kernel.h>
13 #include <linux/init.h>
15 #include <linux/err.h>
16 #include <linux/opp.h>
18 #include <plat/omap-pm.h>
19 #include <plat/omap_device.h>
20 #include <plat/common.h>
21 #include <plat/voltage.h>
23 #include "powerdomain.h"
24 #include "clockdomain.h"
27 static struct omap_device_pm_latency
*pm_lats
;
29 static struct device
*mpu_dev
;
30 static struct device
*iva_dev
;
31 static struct device
*l3_dev
;
32 static struct device
*dsp_dev
;
34 struct device
*omap2_get_mpuss_device(void)
36 WARN_ON_ONCE(!mpu_dev
);
40 struct device
*omap2_get_iva_device(void)
42 WARN_ON_ONCE(!iva_dev
);
46 struct device
*omap2_get_l3_device(void)
48 WARN_ON_ONCE(!l3_dev
);
52 struct device
*omap4_get_dsp_device(void)
54 WARN_ON_ONCE(!dsp_dev
);
57 EXPORT_SYMBOL(omap4_get_dsp_device
);
59 /* static int _init_omap_device(struct omap_hwmod *oh, void *user) */
60 static int _init_omap_device(char *name
, struct device
**new_dev
)
62 struct omap_hwmod
*oh
;
63 struct omap_device
*od
;
65 oh
= omap_hwmod_lookup(name
);
66 if (WARN(!oh
, "%s: could not find omap_hwmod for %s\n",
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",
75 *new_dev
= &od
->pdev
.dev
;
81 * Build omap_devices for processors and bus.
83 static void omap2_init_processor_devices(void)
85 _init_omap_device("mpu", &mpu_dev
);
86 _init_omap_device("iva", &iva_dev
);
87 if (cpu_is_omap44xx()) {
88 _init_omap_device("l3_main_1", &l3_dev
);
89 _init_omap_device("dsp", &dsp_dev
);
91 _init_omap_device("l3_main", &l3_dev
);
95 /* Types of sleep_switch used in omap_set_pwrdm_state */
96 #define FORCEWAKEUP_SWITCH 0
97 #define LOWPOWERSTATE_SWITCH 1
100 * This sets pwrdm state (other than mpu & core. Currently only ON &
103 int omap_set_pwrdm_state(struct powerdomain
*pwrdm
, u32 state
)
106 int sleep_switch
= 0;
109 if (pwrdm
== NULL
|| IS_ERR(pwrdm
))
112 while (!(pwrdm
->pwrsts
& (1 << state
))) {
113 if (state
== PWRDM_POWER_OFF
)
118 cur_state
= pwrdm_read_next_pwrst(pwrdm
);
119 if (cur_state
== state
)
122 if (pwrdm_read_pwrst(pwrdm
) < PWRDM_POWER_ON
) {
123 if ((pwrdm_read_pwrst(pwrdm
) > state
) &&
124 (pwrdm
->flags
& PWRDM_HAS_LOWPOWERSTATECHANGE
)) {
125 sleep_switch
= LOWPOWERSTATE_SWITCH
;
127 clkdm_wakeup(pwrdm
->pwrdm_clkdms
[0]);
128 pwrdm_wait_transition(pwrdm
);
129 sleep_switch
= FORCEWAKEUP_SWITCH
;
133 ret
= pwrdm_set_next_pwrst(pwrdm
, state
);
135 printk(KERN_ERR
"Unable to set state of powerdomain: %s\n",
140 switch (sleep_switch
) {
141 case FORCEWAKEUP_SWITCH
:
142 if (pwrdm
->pwrdm_clkdms
[0]->flags
& CLKDM_CAN_ENABLE_AUTO
)
143 clkdm_allow_idle(pwrdm
->pwrdm_clkdms
[0]);
145 clkdm_sleep(pwrdm
->pwrdm_clkdms
[0]);
147 case LOWPOWERSTATE_SWITCH
:
148 pwrdm_set_lowpwrstchange(pwrdm
);
154 pwrdm_wait_transition(pwrdm
);
155 pwrdm_state_switch(pwrdm
);
161 * This API is to be called during init to put the various voltage
162 * domains to the voltage as per the opp table. Typically we boot up
163 * at the nominal voltage. So this function finds out the rate of
164 * the clock associated with the voltage domain, finds out the correct
165 * opp entry and puts the voltage domain to the voltage specifies
168 static int __init
omap2_set_init_voltage(char *vdd_name
, char *clk_name
,
171 struct voltagedomain
*voltdm
;
174 unsigned long freq
, bootup_volt
;
176 if (!vdd_name
|| !clk_name
|| !dev
) {
177 printk(KERN_ERR
"%s: Invalid parameters!\n", __func__
);
181 voltdm
= omap_voltage_domain_lookup(vdd_name
);
182 if (IS_ERR(voltdm
)) {
183 printk(KERN_ERR
"%s: Unable to get vdd pointer for vdd_%s\n",
188 clk
= clk_get(NULL
, clk_name
);
190 printk(KERN_ERR
"%s: unable to get clk %s\n",
198 opp
= opp_find_freq_ceil(dev
, &freq
);
200 printk(KERN_ERR
"%s: unable to find boot up OPP for vdd_%s\n",
205 bootup_volt
= opp_get_voltage(opp
);
207 printk(KERN_ERR
"%s: unable to find voltage corresponding"
208 "to the bootup OPP for vdd_%s\n", __func__
, vdd_name
);
212 omap_voltage_scale_vdd(voltdm
, bootup_volt
);
216 printk(KERN_ERR
"%s: Unable to put vdd_%s to its init voltage\n\n",
221 static void __init
omap3_init_voltages(void)
223 if (!cpu_is_omap34xx())
226 omap2_set_init_voltage("mpu", "dpll1_ck", mpu_dev
);
227 omap2_set_init_voltage("core", "l3_ick", l3_dev
);
230 static void __init
omap4_init_voltages(void)
232 if (!cpu_is_omap44xx())
235 omap2_set_init_voltage("mpu", "dpll_mpu_ck", mpu_dev
);
236 omap2_set_init_voltage("core", "l3_div_ck", l3_dev
);
237 omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", iva_dev
);
240 static int __init
omap2_common_pm_init(void)
242 omap2_init_processor_devices();
247 postcore_initcall(omap2_common_pm_init
);
249 static int __init
omap2_common_pm_late_init(void)
251 /* Init the OMAP TWL parameters */
255 /* Init the voltage layer */
256 omap_voltage_late_init();
258 /* Initialize the voltages */
259 omap3_init_voltages();
260 omap4_init_voltages();
262 /* Smartreflex device init */
263 omap_devinit_smartreflex();
267 late_initcall(omap2_common_pm_late_init
);