summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-omap2/pm.c
blob: 673a4c1d1d7627df0c390a371d84db8d2c7a3c32 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
/*
 * pm.c - Common OMAP2+ power management-related code
 *
 * Copyright (C) 2010 Texas Instruments, Inc.
 * Copyright (C) 2010 Nokia Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/opp.h>
#include <linux/export.h>
#include <linux/suspend.h>
#include <linux/cpu.h>

#include <asm/system_misc.h>

#include "omap-pm.h"
#include "omap_device.h"
#include "common.h"

#include "soc.h"
#include "prcm-common.h"
#include "voltage.h"
#include "powerdomain.h"
#include "clockdomain.h"
#include "pm.h"
#include "twl-common.h"

/*
 * omap_pm_suspend: points to a function that does the SoC-specific
 * suspend work
 */
int (*omap_pm_suspend)(void);

#ifdef CONFIG_PM
/**
 * struct omap2_oscillator - Describe the board main oscillator latencies
 * @startup_time: oscillator startup latency
 * @shutdown_time: oscillator shutdown latency
 */
struct omap2_oscillator {
	u32 startup_time;
	u32 shutdown_time;
};

static struct omap2_oscillator oscillator = {
	.startup_time = ULONG_MAX,
	.shutdown_time = ULONG_MAX,
};

void omap_pm_setup_oscillator(u32 tstart, u32 tshut)
{
	oscillator.startup_time = tstart;
	oscillator.shutdown_time = tshut;
}

void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
{
	if (!tstart || !tshut)
		return;

	*tstart = oscillator.startup_time;
	*tshut = oscillator.shutdown_time;
}
#endif

static int __init _init_omap_device(char *name)
{
	struct omap_hwmod *oh;
	struct platform_device *pdev;

	oh = omap_hwmod_lookup(name);
	if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
		 __func__, name))
		return -ENODEV;

	pdev = omap_device_build(oh->name, 0, oh, NULL, 0);
	if (WARN(IS_ERR(pdev), "%s: could not build omap_device for %s\n",
		 __func__, name))
		return -ENODEV;

	return 0;
}

/*
 * Build omap_devices for processors and bus.
 */
static void __init omap2_init_processor_devices(void)
{
	_init_omap_device("mpu");
	if (omap3_has_iva())
		_init_omap_device("iva");

	if (cpu_is_omap44xx()) {
		_init_omap_device("l3_main_1");
		_init_omap_device("dsp");
		_init_omap_device("iva");
	} else {
		_init_omap_device("l3_main");
	}
}

int __init omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
{
	/* XXX The usecount test is racy */
	if ((clkdm->flags & CLKDM_CAN_ENABLE_AUTO) &&
	    !(clkdm->flags & CLKDM_MISSING_IDLE_REPORTING))
		clkdm_allow_idle(clkdm);
	else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
		 clkdm->usecount == 0)
		clkdm_sleep(clkdm);
	return 0;
}

/*
 * This API is to be called during init to set the various voltage
 * domains to the voltage as per the opp table. Typically we boot up
 * at the nominal voltage. So this function finds out the rate of
 * the clock associated with the voltage domain, finds out the correct
 * opp entry and sets the voltage domain to the voltage specified
 * in the opp entry
 */
static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
					 const char *oh_name)
{
	struct voltagedomain *voltdm;
	struct clk *clk;
	struct opp *opp;
	unsigned long freq, bootup_volt;
	struct device *dev;

	if (!vdd_name || !clk_name || !oh_name) {
		pr_err("%s: invalid parameters\n", __func__);
		goto exit;
	}

	if (!strncmp(oh_name, "mpu", 3))
		/* 
		 * All current OMAPs share voltage rail and clock
		 * source, so CPU0 is used to represent the MPU-SS.
		 */
		dev = get_cpu_device(0);
	else
		dev = omap_device_get_by_hwmod_name(oh_name);

	if (IS_ERR(dev)) {
		pr_err("%s: Unable to get dev pointer for hwmod %s\n",
			__func__, oh_name);
		goto exit;
	}

	voltdm = voltdm_lookup(vdd_name);
	if (!voltdm) {
		pr_err("%s: unable to get vdd pointer for vdd_%s\n",
			__func__, vdd_name);
		goto exit;
	}

	clk =  clk_get(NULL, clk_name);
	if (IS_ERR(clk)) {
		pr_err("%s: unable to get clk %s\n", __func__, clk_name);
		goto exit;
	}

	freq = clk_get_rate(clk);
	clk_put(clk);

	rcu_read_lock();
	opp = opp_find_freq_ceil(dev, &freq);
	if (IS_ERR(opp)) {
		rcu_read_unlock();
		pr_err("%s: unable to find boot up OPP for vdd_%s\n",
			__func__, vdd_name);
		goto exit;
	}

	bootup_volt = opp_get_voltage(opp);
	rcu_read_unlock();
	if (!bootup_volt) {
		pr_err("%s: unable to find voltage corresponding to the bootup OPP for vdd_%s\n",
		       __func__, vdd_name);
		goto exit;
	}

	voltdm_scale(voltdm, bootup_volt);
	return 0;

exit:
	pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
	return -EINVAL;
}

#ifdef CONFIG_SUSPEND
static int omap_pm_enter(suspend_state_t suspend_state)
{
	int ret = 0;

	if (!omap_pm_suspend)
		return -ENOENT; /* XXX doublecheck */

	switch (suspend_state) {
	case PM_SUSPEND_STANDBY:
	case PM_SUSPEND_MEM:
		ret = omap_pm_suspend();
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

static int omap_pm_begin(suspend_state_t state)
{
	disable_hlt();
	if (cpu_is_omap34xx())
		omap_prcm_irq_prepare();
	return 0;
}

static void omap_pm_end(void)
{
	enable_hlt();
	return;
}

static void omap_pm_finish(void)
{
	if (cpu_is_omap34xx())
		omap_prcm_irq_complete();
}

static const struct platform_suspend_ops omap_pm_ops = {
	.begin		= omap_pm_begin,
	.end		= omap_pm_end,
	.enter		= omap_pm_enter,
	.finish		= omap_pm_finish,
	.valid		= suspend_valid_only_mem,
};

#endif /* CONFIG_SUSPEND */

static void __init omap3_init_voltages(void)
{
	if (!cpu_is_omap34xx())
		return;

	omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
	omap2_set_init_voltage("core", "l3_ick", "l3_main");
}

static void __init omap4_init_voltages(void)
{
	if (!cpu_is_omap44xx())
		return;

	omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
	omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
	omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
}

static int __init omap2_common_pm_init(void)
{
	if (!of_have_populated_dt())
		omap2_init_processor_devices();
	omap_pm_if_init();

	return 0;
}
omap_postcore_initcall(omap2_common_pm_init);

int __init omap2_common_pm_late_init(void)
{
	/*
	 * In the case of DT, the PMIC and SR initialization will be done using
	 * a completely different mechanism.
	 * Disable this part if a DT blob is available.
	 */
	if (!of_have_populated_dt()) {

		/* Init the voltage layer */
		omap_pmic_late_init();
		omap_voltage_late_init();

		/* Initialize the voltages */
		omap3_init_voltages();
		omap4_init_voltages();

		/* Smartreflex device init */
		omap_devinit_smartreflex();
	}

#ifdef CONFIG_SUSPEND
	suspend_set_ops(&omap_pm_ops);
#endif

	return 0;
}