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Paul Walmsleyc0407a92009-09-03 20:14:01 +03001/*
2 * omap-pm-noop.c - OMAP power management interface - dummy version
3 *
4 * This code implements the OMAP power management interface to
5 * drivers, CPUIdle, CPUFreq, and DSP Bridge. It is strictly for
6 * debug/demonstration use, as it does nothing but printk() whenever a
7 * function is called (when DEBUG is defined, below)
8 *
9 * Copyright (C) 2008-2009 Texas Instruments, Inc.
10 * Copyright (C) 2008-2009 Nokia Corporation
11 * Paul Walmsley
12 *
13 * Interface developed by (in alphabetical order):
14 * Karthik Dasu, Tony Lindgren, Rajendra Nayak, Sakari Poussa, Veeramanikandan
15 * Raju, Anand Sawant, Igor Stoppa, Paul Walmsley, Richard Woodruff
16 */
17
18#undef DEBUG
19
20#include <linux/init.h>
21#include <linux/cpufreq.h>
22#include <linux/device.h>
Kevin Hilmanc80705a2010-12-21 21:31:55 -070023#include <linux/platform_device.h>
Paul Walmsleyc0407a92009-09-03 20:14:01 +030024
25/* Interface documentation is in mach/omap-pm.h */
Tony Lindgrence491cf2009-10-20 09:40:47 -070026#include <plat/omap-pm.h>
Kevin Hilmanc80705a2010-12-21 21:31:55 -070027#include <plat/omap_device.h>
Paul Walmsleyc0407a92009-09-03 20:14:01 +030028
Kevin Hilman6081dc32010-12-21 21:31:55 -070029static bool off_mode_enabled;
Tomi Valkeinenfc013872011-06-09 16:56:23 +030030static int dummy_context_loss_counter;
Kevin Hilman6081dc32010-12-21 21:31:55 -070031
Paul Walmsleyc0407a92009-09-03 20:14:01 +030032/*
33 * Device-driver-originated constraints (via board-*.c files)
34 */
35
Paul Walmsley564889c2010-07-26 16:34:34 -060036int omap_pm_set_max_mpu_wakeup_lat(struct device *dev, long t)
Paul Walmsleyc0407a92009-09-03 20:14:01 +030037{
38 if (!dev || t < -1) {
Paul Walmsley564889c2010-07-26 16:34:34 -060039 WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__);
40 return -EINVAL;
Paul Walmsleyc0407a92009-09-03 20:14:01 +030041 };
42
43 if (t == -1)
Paul Walmsley7852ec02012-07-26 00:54:26 -060044 pr_debug("OMAP PM: remove max MPU wakeup latency constraint: dev %s\n",
45 dev_name(dev));
Paul Walmsleyc0407a92009-09-03 20:14:01 +030046 else
Paul Walmsley7852ec02012-07-26 00:54:26 -060047 pr_debug("OMAP PM: add max MPU wakeup latency constraint: dev %s, t = %ld usec\n",
48 dev_name(dev), t);
Paul Walmsleyc0407a92009-09-03 20:14:01 +030049
50 /*
51 * For current Linux, this needs to map the MPU to a
52 * powerdomain, then go through the list of current max lat
53 * constraints on the MPU and find the smallest. If
54 * the latency constraint has changed, the code should
55 * recompute the state to enter for the next powerdomain
56 * state.
57 *
58 * TI CDP code can call constraint_set here.
59 */
Paul Walmsley564889c2010-07-26 16:34:34 -060060
61 return 0;
Paul Walmsleyc0407a92009-09-03 20:14:01 +030062}
63
Paul Walmsley564889c2010-07-26 16:34:34 -060064int omap_pm_set_min_bus_tput(struct device *dev, u8 agent_id, unsigned long r)
Paul Walmsleyc0407a92009-09-03 20:14:01 +030065{
66 if (!dev || (agent_id != OCP_INITIATOR_AGENT &&
67 agent_id != OCP_TARGET_AGENT)) {
Paul Walmsley564889c2010-07-26 16:34:34 -060068 WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__);
69 return -EINVAL;
Paul Walmsleyc0407a92009-09-03 20:14:01 +030070 };
71
72 if (r == 0)
Paul Walmsley7852ec02012-07-26 00:54:26 -060073 pr_debug("OMAP PM: remove min bus tput constraint: dev %s for agent_id %d\n",
74 dev_name(dev), agent_id);
Paul Walmsleyc0407a92009-09-03 20:14:01 +030075 else
Paul Walmsley7852ec02012-07-26 00:54:26 -060076 pr_debug("OMAP PM: add min bus tput constraint: dev %s for agent_id %d: rate %ld KiB\n",
Paul Walmsleyc0407a92009-09-03 20:14:01 +030077 dev_name(dev), agent_id, r);
78
79 /*
80 * This code should model the interconnect and compute the
81 * required clock frequency, convert that to a VDD2 OPP ID, then
82 * set the VDD2 OPP appropriately.
83 *
84 * TI CDP code can call constraint_set here on the VDD2 OPP.
85 */
Paul Walmsley564889c2010-07-26 16:34:34 -060086
87 return 0;
Paul Walmsleyc0407a92009-09-03 20:14:01 +030088}
89
Paul Walmsley564889c2010-07-26 16:34:34 -060090int omap_pm_set_max_dev_wakeup_lat(struct device *req_dev, struct device *dev,
91 long t)
Paul Walmsleyc0407a92009-09-03 20:14:01 +030092{
Paul Walmsley564889c2010-07-26 16:34:34 -060093 if (!req_dev || !dev || t < -1) {
94 WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__);
95 return -EINVAL;
Paul Walmsleyc0407a92009-09-03 20:14:01 +030096 };
97
98 if (t == -1)
Paul Walmsley7852ec02012-07-26 00:54:26 -060099 pr_debug("OMAP PM: remove max device latency constraint: dev %s\n",
100 dev_name(dev));
Paul Walmsleyc0407a92009-09-03 20:14:01 +0300101 else
Paul Walmsley7852ec02012-07-26 00:54:26 -0600102 pr_debug("OMAP PM: add max device latency constraint: dev %s, t = %ld usec\n",
103 dev_name(dev), t);
Paul Walmsleyc0407a92009-09-03 20:14:01 +0300104
105 /*
106 * For current Linux, this needs to map the device to a
107 * powerdomain, then go through the list of current max lat
108 * constraints on that powerdomain and find the smallest. If
109 * the latency constraint has changed, the code should
110 * recompute the state to enter for the next powerdomain
111 * state. Conceivably, this code should also determine
112 * whether to actually disable the device clocks or not,
113 * depending on how long it takes to re-enable the clocks.
114 *
115 * TI CDP code can call constraint_set here.
116 */
Paul Walmsley564889c2010-07-26 16:34:34 -0600117
118 return 0;
Paul Walmsleyc0407a92009-09-03 20:14:01 +0300119}
120
Paul Walmsley564889c2010-07-26 16:34:34 -0600121int omap_pm_set_max_sdma_lat(struct device *dev, long t)
Paul Walmsleyc0407a92009-09-03 20:14:01 +0300122{
123 if (!dev || t < -1) {
Paul Walmsley564889c2010-07-26 16:34:34 -0600124 WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__);
125 return -EINVAL;
Paul Walmsleyc0407a92009-09-03 20:14:01 +0300126 };
127
128 if (t == -1)
Paul Walmsley7852ec02012-07-26 00:54:26 -0600129 pr_debug("OMAP PM: remove max DMA latency constraint: dev %s\n",
130 dev_name(dev));
Paul Walmsleyc0407a92009-09-03 20:14:01 +0300131 else
Paul Walmsley7852ec02012-07-26 00:54:26 -0600132 pr_debug("OMAP PM: add max DMA latency constraint: dev %s, t = %ld usec\n",
133 dev_name(dev), t);
Paul Walmsleyc0407a92009-09-03 20:14:01 +0300134
135 /*
136 * For current Linux PM QOS params, this code should scan the
137 * list of maximum CPU and DMA latencies and select the
138 * smallest, then set cpu_dma_latency pm_qos_param
139 * accordingly.
140 *
141 * For future Linux PM QOS params, with separate CPU and DMA
142 * latency params, this code should just set the dma_latency param.
143 *
144 * TI CDP code can call constraint_set here.
145 */
146
Paul Walmsley564889c2010-07-26 16:34:34 -0600147 return 0;
Paul Walmsleyc0407a92009-09-03 20:14:01 +0300148}
149
Paul Walmsleyfb8ce142010-07-26 16:34:34 -0600150int omap_pm_set_min_clk_rate(struct device *dev, struct clk *c, long r)
151{
152 if (!dev || !c || r < 0) {
153 WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__);
154 return -EINVAL;
155 }
156
157 if (r == 0)
Paul Walmsley7852ec02012-07-26 00:54:26 -0600158 pr_debug("OMAP PM: remove min clk rate constraint: dev %s\n",
159 dev_name(dev));
Paul Walmsleyfb8ce142010-07-26 16:34:34 -0600160 else
Paul Walmsley7852ec02012-07-26 00:54:26 -0600161 pr_debug("OMAP PM: add min clk rate constraint: dev %s, rate = %ld Hz\n",
162 dev_name(dev), r);
Paul Walmsleyfb8ce142010-07-26 16:34:34 -0600163
164 /*
165 * Code in a real implementation should keep track of these
166 * constraints on the clock, and determine the highest minimum
167 * clock rate. It should iterate over each OPP and determine
168 * whether the OPP will result in a clock rate that would
169 * satisfy this constraint (and any other PM constraint in effect
170 * at that time). Once it finds the lowest-voltage OPP that
171 * meets those conditions, it should switch to it, or return
172 * an error if the code is not capable of doing so.
173 */
174
175 return 0;
176}
Paul Walmsleyc0407a92009-09-03 20:14:01 +0300177
178/*
179 * DSP Bridge-specific constraints
180 */
181
182const struct omap_opp *omap_pm_dsp_get_opp_table(void)
183{
184 pr_debug("OMAP PM: DSP request for OPP table\n");
185
186 /*
187 * Return DSP frequency table here: The final item in the
188 * array should have .rate = .opp_id = 0.
189 */
190
191 return NULL;
192}
193
194void omap_pm_dsp_set_min_opp(u8 opp_id)
195{
196 if (opp_id == 0) {
197 WARN_ON(1);
198 return;
199 }
200
201 pr_debug("OMAP PM: DSP requests minimum VDD1 OPP to be %d\n", opp_id);
202
203 /*
204 *
205 * For l-o dev tree, our VDD1 clk is keyed on OPP ID, so we
206 * can just test to see which is higher, the CPU's desired OPP
207 * ID or the DSP's desired OPP ID, and use whichever is
208 * highest.
209 *
210 * In CDP12.14+, the VDD1 OPP custom clock that controls the DSP
211 * rate is keyed on MPU speed, not the OPP ID. So we need to
212 * map the OPP ID to the MPU speed for use with clk_set_rate()
213 * if it is higher than the current OPP clock rate.
214 *
215 */
216}
217
218
219u8 omap_pm_dsp_get_opp(void)
220{
221 pr_debug("OMAP PM: DSP requests current DSP OPP ID\n");
222
223 /*
224 * For l-o dev tree, call clk_get_rate() on VDD1 OPP clock
225 *
226 * CDP12.14+:
227 * Call clk_get_rate() on the OPP custom clock, map that to an
228 * OPP ID using the tables defined in board-*.c/chip-*.c files.
229 */
230
231 return 0;
232}
233
234/*
235 * CPUFreq-originated constraint
236 *
237 * In the future, this should be handled by custom OPP clocktype
238 * functions.
239 */
240
241struct cpufreq_frequency_table **omap_pm_cpu_get_freq_table(void)
242{
243 pr_debug("OMAP PM: CPUFreq request for frequency table\n");
244
245 /*
246 * Return CPUFreq frequency table here: loop over
247 * all VDD1 clkrates, pull out the mpu_ck frequencies, build
248 * table
249 */
250
251 return NULL;
252}
253
254void omap_pm_cpu_set_freq(unsigned long f)
255{
256 if (f == 0) {
257 WARN_ON(1);
258 return;
259 }
260
261 pr_debug("OMAP PM: CPUFreq requests CPU frequency to be set to %lu\n",
262 f);
263
264 /*
265 * For l-o dev tree, determine whether MPU freq or DSP OPP id
266 * freq is higher. Find the OPP ID corresponding to the
267 * higher frequency. Call clk_round_rate() and clk_set_rate()
268 * on the OPP custom clock.
269 *
270 * CDP should just be able to set the VDD1 OPP clock rate here.
271 */
272}
273
274unsigned long omap_pm_cpu_get_freq(void)
275{
276 pr_debug("OMAP PM: CPUFreq requests current CPU frequency\n");
277
278 /*
279 * Call clk_get_rate() on the mpu_ck.
280 */
281
282 return 0;
283}
284
Kevin Hilman6081dc32010-12-21 21:31:55 -0700285/**
286 * omap_pm_enable_off_mode - notify OMAP PM that off-mode is enabled
287 *
288 * Intended for use only by OMAP PM core code to notify this layer
289 * that off mode has been enabled.
290 */
291void omap_pm_enable_off_mode(void)
292{
293 off_mode_enabled = true;
294}
295
296/**
297 * omap_pm_disable_off_mode - notify OMAP PM that off-mode is disabled
298 *
299 * Intended for use only by OMAP PM core code to notify this layer
300 * that off mode has been disabled.
301 */
302void omap_pm_disable_off_mode(void)
303{
304 off_mode_enabled = false;
305}
306
Paul Walmsleyc0407a92009-09-03 20:14:01 +0300307/*
308 * Device context loss tracking
309 */
310
Kevin Hilman6081dc32010-12-21 21:31:55 -0700311#ifdef CONFIG_ARCH_OMAP2PLUS
312
Tomi Valkeinenfc013872011-06-09 16:56:23 +0300313int omap_pm_get_dev_context_loss_count(struct device *dev)
Paul Walmsleyc0407a92009-09-03 20:14:01 +0300314{
Kevin Hilmanc80705a2010-12-21 21:31:55 -0700315 struct platform_device *pdev = to_platform_device(dev);
Tomi Valkeinenfc013872011-06-09 16:56:23 +0300316 int count;
Paul Walmsleyc0407a92009-09-03 20:14:01 +0300317
Kevin Hilmanc80705a2010-12-21 21:31:55 -0700318 if (WARN_ON(!dev))
Tomi Valkeinenfc013872011-06-09 16:56:23 +0300319 return -ENODEV;
Paul Walmsleyc0407a92009-09-03 20:14:01 +0300320
Kevin Hilman3ec2dec2012-02-15 11:47:45 -0800321 if (dev->pm_domain == &omap_device_pm_domain) {
Kevin Hilman6081dc32010-12-21 21:31:55 -0700322 count = omap_device_get_context_loss_count(pdev);
323 } else {
324 WARN_ONCE(off_mode_enabled, "omap_pm: using dummy context loss counter; device %s should be converted to omap_device",
325 dev_name(dev));
Tomi Valkeinenfc013872011-06-09 16:56:23 +0300326
Kevin Hilman6081dc32010-12-21 21:31:55 -0700327 count = dummy_context_loss_counter;
Tomi Valkeinenfc013872011-06-09 16:56:23 +0300328
329 if (off_mode_enabled) {
330 count++;
331 /*
332 * Context loss count has to be a non-negative value.
333 * Clear the sign bit to get a value range from 0 to
334 * INT_MAX.
335 */
336 count &= INT_MAX;
337 dummy_context_loss_counter = count;
338 }
Kevin Hilman6081dc32010-12-21 21:31:55 -0700339 }
340
Kevin Hilmanc80705a2010-12-21 21:31:55 -0700341 pr_debug("OMAP PM: context loss count for dev %s = %d\n",
342 dev_name(dev), count);
Paul Walmsleyc0407a92009-09-03 20:14:01 +0300343
Kevin Hilmanc80705a2010-12-21 21:31:55 -0700344 return count;
Paul Walmsleyc0407a92009-09-03 20:14:01 +0300345}
346
Kevin Hilman6081dc32010-12-21 21:31:55 -0700347#else
348
Tomi Valkeinenfc013872011-06-09 16:56:23 +0300349int omap_pm_get_dev_context_loss_count(struct device *dev)
Kevin Hilman6081dc32010-12-21 21:31:55 -0700350{
351 return dummy_context_loss_counter;
352}
353
354#endif
Paul Walmsleyc0407a92009-09-03 20:14:01 +0300355
356/* Should be called before clk framework init */
Kevin Hilman53da4ce2010-12-09 09:13:48 -0600357int __init omap_pm_if_early_init(void)
Paul Walmsleyc0407a92009-09-03 20:14:01 +0300358{
Paul Walmsleyc0407a92009-09-03 20:14:01 +0300359 return 0;
360}
361
362/* Must be called after clock framework is initialized */
363int __init omap_pm_if_init(void)
364{
365 return 0;
366}
367
368void omap_pm_if_exit(void)
369{
370 /* Deallocate CPUFreq frequency table here */
371}
372