pm.c revision 0f7aa005c85917f114c376e937d88f5d941fb389 
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
27static struct omap_device_pm_latency *pm_lats;
28
29static struct device *mpu_dev;
30static struct device *iva_dev;
31static struct device *l3_dev;
32static struct device *dsp_dev;
33
34struct device *omap2_get_mpuss_device(void)
35{
36	WARN_ON_ONCE(!mpu_dev);
37	return mpu_dev;
38}
39
40struct device *omap2_get_iva_device(void)
41{
42	WARN_ON_ONCE(!iva_dev);
43	return iva_dev;
44}
45
46struct device *omap2_get_l3_device(void)
47{
48	WARN_ON_ONCE(!l3_dev);
49	return l3_dev;
50}
51
52struct device *omap4_get_dsp_device(void)
53{
54	WARN_ON_ONCE(!dsp_dev);
55	return dsp_dev;
56}
57EXPORT_SYMBOL(omap4_get_dsp_device);
58
59/* static int _init_omap_device(struct omap_hwmod *oh, void *user) */
60static int _init_omap_device(char *name, struct device **new_dev)
61{
62	struct omap_hwmod *oh;
63	struct platform_device *pdev;
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	pdev = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
71	if (WARN(IS_ERR(pdev), "%s: could not build omap_device for %s\n",
72		 __func__, name))
73		return -ENODEV;
74
75	*new_dev = &pdev->dev;
76
77	return 0;
78}
79
80/*
81 * Build omap_devices for processors and bus.
82 */
83static 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 */
106int 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		pr_err("%s: unable to set state of powerdomain: %s\n",
140		       __func__, 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);
159err:
160	return ret;
161}
162
163/*
164 * This API is to be called during init to set 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 sets the voltage domain to the voltage specified
169 * in the opp entry
170 */
171static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
172					 const char *oh_name)
173{
174	struct voltagedomain *voltdm;
175	struct clk *clk;
176	struct opp *opp;
177	unsigned long freq, bootup_volt;
178	struct device *dev;
179
180	if (!vdd_name || !clk_name || !oh_name) {
181		pr_err("%s: invalid parameters\n", __func__);
182		goto exit;
183	}
184
185	dev = omap_device_get_by_hwmod_name(oh_name);
186	if (IS_ERR(dev)) {
187		pr_err("%s: Unable to get dev pointer for hwmod %s\n",
188			__func__, oh_name);
189		goto exit;
190	}
191
192	voltdm = voltdm_lookup(vdd_name);
193	if (IS_ERR(voltdm)) {
194		pr_err("%s: unable to get vdd pointer for vdd_%s\n",
195			__func__, vdd_name);
196		goto exit;
197	}
198
199	clk =  clk_get(NULL, clk_name);
200	if (IS_ERR(clk)) {
201		pr_err("%s: unable to get clk %s\n", __func__, clk_name);
202		goto exit;
203	}
204
205	freq = clk->rate;
206	clk_put(clk);
207
208	opp = opp_find_freq_ceil(dev, &freq);
209	if (IS_ERR(opp)) {
210		pr_err("%s: unable to find boot up OPP for vdd_%s\n",
211			__func__, vdd_name);
212		goto exit;
213	}
214
215	bootup_volt = opp_get_voltage(opp);
216	if (!bootup_volt) {
217		pr_err("%s: unable to find voltage corresponding "
218			"to the bootup OPP for vdd_%s\n", __func__, vdd_name);
219		goto exit;
220	}
221
222	voltdm_scale(voltdm, bootup_volt);
223	return 0;
224
225exit:
226	pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
227	return -EINVAL;
228}
229
230static void __init omap3_init_voltages(void)
231{
232	if (!cpu_is_omap34xx())
233		return;
234
235	omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
236	omap2_set_init_voltage("core", "l3_ick", "l3_main");
237}
238
239static void __init omap4_init_voltages(void)
240{
241	if (!cpu_is_omap44xx())
242		return;
243
244	omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
245	omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
246	omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
247}
248
249static int __init omap2_common_pm_init(void)
250{
251	omap2_init_processor_devices();
252	omap_pm_if_init();
253
254	return 0;
255}
256postcore_initcall(omap2_common_pm_init);
257
258static int __init omap2_common_pm_late_init(void)
259{
260	/* Init the OMAP TWL parameters */
261	omap3_twl_init();
262	omap4_twl_init();
263
264	/* Init the voltage layer */
265	omap_voltage_late_init();
266
267	/* Initialize the voltages */
268	omap3_init_voltages();
269	omap4_init_voltages();
270
271	/* Smartreflex device init */
272	omap_devinit_smartreflex();
273
274	return 0;
275}
276late_initcall(omap2_common_pm_late_init);
277