aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/plat-omap/omap-pm-noop.c
blob: 186bca82cfab76dbe64cb8ebb883efedbee18ba2 (plain) (blame)
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
/*
 * omap-pm-noop.c - OMAP power management interface - dummy version
 *
 * This code implements the OMAP power management interface to
 * drivers, CPUIdle, CPUFreq, and DSP Bridge.  It is strictly for
 * debug/demonstration use, as it does nothing but printk() whenever a
 * function is called (when DEBUG is defined, below)
 *
 * Copyright (C) 2008-2009 Texas Instruments, Inc.
 * Copyright (C) 2008-2009 Nokia Corporation
 * Paul Walmsley
 *
 * Interface developed by (in alphabetical order):
 * Karthik Dasu, Tony Lindgren, Rajendra Nayak, Sakari Poussa, Veeramanikandan
 * Raju, Anand Sawant, Igor Stoppa, Paul Walmsley, Richard Woodruff
 */

#undef DEBUG

#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/device.h>

/* Interface documentation is in mach/omap-pm.h */
#include <plat/omap-pm.h>

#include <plat/powerdomain.h>

struct omap_opp *dsp_opps;
struct omap_opp *mpu_opps;
struct omap_opp *l3_opps;

/*
 * Device-driver-originated constraints (via board-*.c files)
 */

void omap_pm_set_max_mpu_wakeup_lat(struct device *dev, long t)
{
	if (!dev || t < -1) {
		WARN_ON(1);
		return;
	};

	if (t == -1)
		pr_debug("OMAP PM: remove max MPU wakeup latency constraint: "
			 "dev %s\n", dev_name(dev));
	else
		pr_debug("OMAP PM: add max MPU wakeup latency constraint: "
			 "dev %s, t = %ld usec\n", dev_name(dev), t);

	/*
	 * For current Linux, this needs to map the MPU to a
	 * powerdomain, then go through the list of current max lat
	 * constraints on the MPU and find the smallest.  If
	 * the latency constraint has changed, the code should
	 * recompute the state to enter for the next powerdomain
	 * state.
	 *
	 * TI CDP code can call constraint_set here.
	 */
}

void omap_pm_set_min_bus_tput(struct device *dev, u8 agent_id, unsigned long r)
{
	if (!dev || (agent_id != OCP_INITIATOR_AGENT &&
	    agent_id != OCP_TARGET_AGENT)) {
		WARN_ON(1);
		return;
	};

	if (r == 0)
		pr_debug("OMAP PM: remove min bus tput constraint: "
			 "dev %s for agent_id %d\n", dev_name(dev), agent_id);
	else
		pr_debug("OMAP PM: add min bus tput constraint: "
			 "dev %s for agent_id %d: rate %ld KiB\n",
			 dev_name(dev), agent_id, r);

	/*
	 * This code should model the interconnect and compute the
	 * required clock frequency, convert that to a VDD2 OPP ID, then
	 * set the VDD2 OPP appropriately.
	 *
	 * TI CDP code can call constraint_set here on the VDD2 OPP.
	 */
}

void omap_pm_set_max_dev_wakeup_lat(struct device *dev, long t)
{
	if (!dev || t < -1) {
		WARN_ON(1);
		return;
	};

	if (t == -1)
		pr_debug("OMAP PM: remove max device latency constraint: "
			 "dev %s\n", dev_name(dev));
	else
		pr_debug("OMAP PM: add max device latency constraint: "
			 "dev %s, t = %ld usec\n", dev_name(dev), t);

	/*
	 * For current Linux, this needs to map the device to a
	 * powerdomain, then go through the list of current max lat
	 * constraints on that powerdomain and find the smallest.  If
	 * the latency constraint has changed, the code should
	 * recompute the state to enter for the next powerdomain
	 * state.  Conceivably, this code should also determine
	 * whether to actually disable the device clocks or not,
	 * depending on how long it takes to re-enable the clocks.
	 *
	 * TI CDP code can call constraint_set here.
	 */
}

void omap_pm_set_max_sdma_lat(struct device *dev, long t)
{
	if (!dev || t < -1) {
		WARN_ON(1);
		return;
	};

	if (t == -1)
		pr_debug("OMAP PM: remove max DMA latency constraint: "
			 "dev %s\n", dev_name(dev));
	else
		pr_debug("OMAP PM: add max DMA latency constraint: "
			 "dev %s, t = %ld usec\n", dev_name(dev), t);

	/*
	 * For current Linux PM QOS params, this code should scan the
	 * list of maximum CPU and DMA latencies and select the
	 * smallest, then set cpu_dma_latency pm_qos_param
	 * accordingly.
	 *
	 * For future Linux PM QOS params, with separate CPU and DMA
	 * latency params, this code should just set the dma_latency param.
	 *
	 * TI CDP code can call constraint_set here.
	 */

}


/*
 * DSP Bridge-specific constraints
 */

const struct omap_opp *omap_pm_dsp_get_opp_table(void)
{
	pr_debug("OMAP PM: DSP request for OPP table\n");

	/*
	 * Return DSP frequency table here:  The final item in the
	 * array should have .rate = .opp_id = 0.
	 */

	return NULL;
}

void omap_pm_dsp_set_min_opp(u8 opp_id)
{
	if (opp_id == 0) {
		WARN_ON(1);
		return;
	}

	pr_debug("OMAP PM: DSP requests minimum VDD1 OPP to be %d\n", opp_id);

	/*
	 *
	 * For l-o dev tree, our VDD1 clk is keyed on OPP ID, so we
	 * can just test to see which is higher, the CPU's desired OPP
	 * ID or the DSP's desired OPP ID, and use whichever is
	 * highest.
	 *
	 * In CDP12.14+, the VDD1 OPP custom clock that controls the DSP
	 * rate is keyed on MPU speed, not the OPP ID.  So we need to
	 * map the OPP ID to the MPU speed for use with clk_set_rate()
	 * if it is higher than the current OPP clock rate.
	 *
	 */
}


u8 omap_pm_dsp_get_opp(void)
{
	pr_debug("OMAP PM: DSP requests current DSP OPP ID\n");

	/*
	 * For l-o dev tree, call clk_get_rate() on VDD1 OPP clock
	 *
	 * CDP12.14+:
	 * Call clk_get_rate() on the OPP custom clock, map that to an
	 * OPP ID using the tables defined in board-*.c/chip-*.c files.
	 */

	return 0;
}

/*
 * CPUFreq-originated constraint
 *
 * In the future, this should be handled by custom OPP clocktype
 * functions.
 */

struct cpufreq_frequency_table **omap_pm_cpu_get_freq_table(void)
{
	pr_debug("OMAP PM: CPUFreq request for frequency table\n");

	/*
	 * Return CPUFreq frequency table here: loop over
	 * all VDD1 clkrates, pull out the mpu_ck frequencies, build
	 * table
	 */

	return NULL;
}

void omap_pm_cpu_set_freq(unsigned long f)
{
	if (f == 0) {
		WARN_ON(1);
		return;
	}

	pr_debug("OMAP PM: CPUFreq requests CPU frequency to be set to %lu\n",
		 f);

	/*
	 * For l-o dev tree, determine whether MPU freq or DSP OPP id
	 * freq is higher.  Find the OPP ID corresponding to the
	 * higher frequency.  Call clk_round_rate() and clk_set_rate()
	 * on the OPP custom clock.
	 *
	 * CDP should just be able to set the VDD1 OPP clock rate here.
	 */
}

unsigned long omap_pm_cpu_get_freq(void)
{
	pr_debug("OMAP PM: CPUFreq requests current CPU frequency\n");

	/*
	 * Call clk_get_rate() on the mpu_ck.
	 */

	return 0;
}

/*
 * Device context loss tracking
 */

int omap_pm_get_dev_context_loss_count(struct device *dev)
{
	if (!dev) {
		WARN_ON(1);
		return -EINVAL;
	};

	pr_debug("OMAP PM: returning context loss count for dev %s\n",
		 dev_name(dev));

	/*
	 * Map the device to the powerdomain.  Return the powerdomain
	 * off counter.
	 */

	return 0;
}


/* Should be called before clk framework init */
int __init omap_pm_if_early_init(struct omap_opp *mpu_opp_table,
				 struct omap_opp *dsp_opp_table,
				 struct omap_opp *l3_opp_table)
{
	mpu_opps = mpu_opp_table;
	dsp_opps = dsp_opp_table;
	l3_opps = l3_opp_table;
	return 0;
}

/* Must be called after clock framework is initialized */
int __init omap_pm_if_init(void)
{
	return 0;
}

void omap_pm_if_exit(void)
{
	/* Deallocate CPUFreq frequency table here */
}