2 * omap-pm-noop.c - OMAP power management interface - dummy version
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)
9 * Copyright (C) 2008-2009 Texas Instruments, Inc.
10 * Copyright (C) 2008-2009 Nokia Corporation
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
20 #include <linux/init.h>
21 #include <linux/cpufreq.h>
22 #include <linux/device.h>
23 #include <linux/platform_device.h>
25 /* Interface documentation is in mach/omap-pm.h */
26 #include <plat/omap-pm.h>
27 #include <plat/omap_device.h>
29 static bool off_mode_enabled
;
30 static int dummy_context_loss_counter
;
33 * Device-driver-originated constraints (via board-*.c files)
36 int omap_pm_set_max_mpu_wakeup_lat(struct device
*dev
, long t
)
39 WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__
);
44 pr_debug("OMAP PM: remove max MPU wakeup latency constraint: "
45 "dev %s\n", dev_name(dev
));
47 pr_debug("OMAP PM: add max MPU wakeup latency constraint: "
48 "dev %s, t = %ld usec\n", dev_name(dev
), t
);
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
58 * TI CDP code can call constraint_set here.
64 int omap_pm_set_min_bus_tput(struct device
*dev
, u8 agent_id
, unsigned long r
)
66 if (!dev
|| (agent_id
!= OCP_INITIATOR_AGENT
&&
67 agent_id
!= OCP_TARGET_AGENT
)) {
68 WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__
);
73 pr_debug("OMAP PM: remove min bus tput constraint: "
74 "dev %s for agent_id %d\n", dev_name(dev
), agent_id
);
76 pr_debug("OMAP PM: add min bus tput constraint: "
77 "dev %s for agent_id %d: rate %ld KiB\n",
78 dev_name(dev
), agent_id
, r
);
81 * This code should model the interconnect and compute the
82 * required clock frequency, convert that to a VDD2 OPP ID, then
83 * set the VDD2 OPP appropriately.
85 * TI CDP code can call constraint_set here on the VDD2 OPP.
91 int omap_pm_set_max_dev_wakeup_lat(struct device
*req_dev
, struct device
*dev
,
94 if (!req_dev
|| !dev
|| t
< -1) {
95 WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__
);
100 pr_debug("OMAP PM: remove max device latency constraint: "
101 "dev %s\n", dev_name(dev
));
103 pr_debug("OMAP PM: add max device latency constraint: "
104 "dev %s, t = %ld usec\n", dev_name(dev
), t
);
107 * For current Linux, this needs to map the device to a
108 * powerdomain, then go through the list of current max lat
109 * constraints on that powerdomain and find the smallest. If
110 * the latency constraint has changed, the code should
111 * recompute the state to enter for the next powerdomain
112 * state. Conceivably, this code should also determine
113 * whether to actually disable the device clocks or not,
114 * depending on how long it takes to re-enable the clocks.
116 * TI CDP code can call constraint_set here.
122 int omap_pm_set_max_sdma_lat(struct device
*dev
, long t
)
124 if (!dev
|| t
< -1) {
125 WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__
);
130 pr_debug("OMAP PM: remove max DMA latency constraint: "
131 "dev %s\n", dev_name(dev
));
133 pr_debug("OMAP PM: add max DMA latency constraint: "
134 "dev %s, t = %ld usec\n", dev_name(dev
), t
);
137 * For current Linux PM QOS params, this code should scan the
138 * list of maximum CPU and DMA latencies and select the
139 * smallest, then set cpu_dma_latency pm_qos_param
142 * For future Linux PM QOS params, with separate CPU and DMA
143 * latency params, this code should just set the dma_latency param.
145 * TI CDP code can call constraint_set here.
151 int omap_pm_set_min_clk_rate(struct device
*dev
, struct clk
*c
, long r
)
153 if (!dev
|| !c
|| r
< 0) {
154 WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__
);
159 pr_debug("OMAP PM: remove min clk rate constraint: "
160 "dev %s\n", dev_name(dev
));
162 pr_debug("OMAP PM: add min clk rate constraint: "
163 "dev %s, rate = %ld Hz\n", dev_name(dev
), r
);
166 * Code in a real implementation should keep track of these
167 * constraints on the clock, and determine the highest minimum
168 * clock rate. It should iterate over each OPP and determine
169 * whether the OPP will result in a clock rate that would
170 * satisfy this constraint (and any other PM constraint in effect
171 * at that time). Once it finds the lowest-voltage OPP that
172 * meets those conditions, it should switch to it, or return
173 * an error if the code is not capable of doing so.
180 * DSP Bridge-specific constraints
183 const struct omap_opp
*omap_pm_dsp_get_opp_table(void)
185 pr_debug("OMAP PM: DSP request for OPP table\n");
188 * Return DSP frequency table here: The final item in the
189 * array should have .rate = .opp_id = 0.
195 void omap_pm_dsp_set_min_opp(u8 opp_id
)
202 pr_debug("OMAP PM: DSP requests minimum VDD1 OPP to be %d\n", opp_id
);
206 * For l-o dev tree, our VDD1 clk is keyed on OPP ID, so we
207 * can just test to see which is higher, the CPU's desired OPP
208 * ID or the DSP's desired OPP ID, and use whichever is
211 * In CDP12.14+, the VDD1 OPP custom clock that controls the DSP
212 * rate is keyed on MPU speed, not the OPP ID. So we need to
213 * map the OPP ID to the MPU speed for use with clk_set_rate()
214 * if it is higher than the current OPP clock rate.
220 u8
omap_pm_dsp_get_opp(void)
222 pr_debug("OMAP PM: DSP requests current DSP OPP ID\n");
225 * For l-o dev tree, call clk_get_rate() on VDD1 OPP clock
228 * Call clk_get_rate() on the OPP custom clock, map that to an
229 * OPP ID using the tables defined in board-*.c/chip-*.c files.
236 * CPUFreq-originated constraint
238 * In the future, this should be handled by custom OPP clocktype
242 struct cpufreq_frequency_table
**omap_pm_cpu_get_freq_table(void)
244 pr_debug("OMAP PM: CPUFreq request for frequency table\n");
247 * Return CPUFreq frequency table here: loop over
248 * all VDD1 clkrates, pull out the mpu_ck frequencies, build
255 void omap_pm_cpu_set_freq(unsigned long f
)
262 pr_debug("OMAP PM: CPUFreq requests CPU frequency to be set to %lu\n",
266 * For l-o dev tree, determine whether MPU freq or DSP OPP id
267 * freq is higher. Find the OPP ID corresponding to the
268 * higher frequency. Call clk_round_rate() and clk_set_rate()
269 * on the OPP custom clock.
271 * CDP should just be able to set the VDD1 OPP clock rate here.
275 unsigned long omap_pm_cpu_get_freq(void)
277 pr_debug("OMAP PM: CPUFreq requests current CPU frequency\n");
280 * Call clk_get_rate() on the mpu_ck.
287 * omap_pm_enable_off_mode - notify OMAP PM that off-mode is enabled
289 * Intended for use only by OMAP PM core code to notify this layer
290 * that off mode has been enabled.
292 void omap_pm_enable_off_mode(void)
294 off_mode_enabled
= true;
298 * omap_pm_disable_off_mode - notify OMAP PM that off-mode is disabled
300 * Intended for use only by OMAP PM core code to notify this layer
301 * that off mode has been disabled.
303 void omap_pm_disable_off_mode(void)
305 off_mode_enabled
= false;
309 * Device context loss tracking
312 #ifdef CONFIG_ARCH_OMAP2PLUS
314 int omap_pm_get_dev_context_loss_count(struct device
*dev
)
316 struct platform_device
*pdev
= to_platform_device(dev
);
322 if (dev
->pm_domain
== &omap_device_pm_domain
) {
323 count
= omap_device_get_context_loss_count(pdev
);
325 WARN_ONCE(off_mode_enabled
, "omap_pm: using dummy context loss counter; device %s should be converted to omap_device",
328 count
= dummy_context_loss_counter
;
330 if (off_mode_enabled
) {
333 * Context loss count has to be a non-negative value.
334 * Clear the sign bit to get a value range from 0 to
338 dummy_context_loss_counter
= count
;
342 pr_debug("OMAP PM: context loss count for dev %s = %d\n",
343 dev_name(dev
), count
);
350 int omap_pm_get_dev_context_loss_count(struct device
*dev
)
352 return dummy_context_loss_counter
;
357 /* Should be called before clk framework init */
358 int __init
omap_pm_if_early_init(void)
363 /* Must be called after clock framework is initialized */
364 int __init
omap_pm_if_init(void)
369 void omap_pm_if_exit(void)
371 /* Deallocate CPUFreq frequency table here */