1/*
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>
23#include <linux/platform_device.h>
24
25#include "omap_device.h"
26#include "omap-pm.h"
27
28static bool off_mode_enabled;
29static int dummy_context_loss_counter;
30
31/*
32 * Device-driver-originated constraints (via board-*.c files)
33 */
34
35int omap_pm_set_max_mpu_wakeup_lat(struct device *dev, long t)
36{
37	if (!dev || t < -1) {
38		WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__);
39		return -EINVAL;
40	}
41
42	if (t == -1)
43		pr_debug("OMAP PM: remove max MPU wakeup latency constraint: dev %s\n",
44			 dev_name(dev));
45	else
46		pr_debug("OMAP PM: add max MPU wakeup latency constraint: dev %s, t = %ld usec\n",
47			 dev_name(dev), t);
48
49	/*
50	 * For current Linux, this needs to map the MPU to a
51	 * powerdomain, then go through the list of current max lat
52	 * constraints on the MPU and find the smallest.  If
53	 * the latency constraint has changed, the code should
54	 * recompute the state to enter for the next powerdomain
55	 * state.
56	 *
57	 * TI CDP code can call constraint_set here.
58	 */
59
60	return 0;
61}
62
63int omap_pm_set_min_bus_tput(struct device *dev, u8 agent_id, unsigned long r)
64{
65	if (!dev || (agent_id != OCP_INITIATOR_AGENT &&
66	    agent_id != OCP_TARGET_AGENT)) {
67		WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__);
68		return -EINVAL;
69	}
70
71	if (r == 0)
72		pr_debug("OMAP PM: remove min bus tput constraint: dev %s for agent_id %d\n",
73			 dev_name(dev), agent_id);
74	else
75		pr_debug("OMAP PM: add min bus tput constraint: dev %s for agent_id %d: rate %ld KiB\n",
76			 dev_name(dev), agent_id, r);
77
78	/*
79	 * This code should model the interconnect and compute the
80	 * required clock frequency, convert that to a VDD2 OPP ID, then
81	 * set the VDD2 OPP appropriately.
82	 *
83	 * TI CDP code can call constraint_set here on the VDD2 OPP.
84	 */
85
86	return 0;
87}
88
89/*
90 * DSP Bridge-specific constraints
91 */
92
93
94/**
95 * omap_pm_enable_off_mode - notify OMAP PM that off-mode is enabled
96 *
97 * Intended for use only by OMAP PM core code to notify this layer
98 * that off mode has been enabled.
99 */
100void omap_pm_enable_off_mode(void)
101{
102	off_mode_enabled = true;
103}
104
105/**
106 * omap_pm_disable_off_mode - notify OMAP PM that off-mode is disabled
107 *
108 * Intended for use only by OMAP PM core code to notify this layer
109 * that off mode has been disabled.
110 */
111void omap_pm_disable_off_mode(void)
112{
113	off_mode_enabled = false;
114}
115
116/*
117 * Device context loss tracking
118 */
119
120#ifdef CONFIG_ARCH_OMAP2PLUS
121
122int omap_pm_get_dev_context_loss_count(struct device *dev)
123{
124	struct platform_device *pdev = to_platform_device(dev);
125	int count;
126
127	if (WARN_ON(!dev))
128		return -ENODEV;
129
130	if (dev->pm_domain == &omap_device_pm_domain) {
131		count = omap_device_get_context_loss_count(pdev);
132	} else {
133		WARN_ONCE(off_mode_enabled, "omap_pm: using dummy context loss counter; device %s should be converted to omap_device",
134			  dev_name(dev));
135
136		count = dummy_context_loss_counter;
137
138		if (off_mode_enabled) {
139			count++;
140			/*
141			 * Context loss count has to be a non-negative value.
142			 * Clear the sign bit to get a value range from 0 to
143			 * INT_MAX.
144			 */
145			count &= INT_MAX;
146			dummy_context_loss_counter = count;
147		}
148	}
149
150	pr_debug("OMAP PM: context loss count for dev %s = %d\n",
151		 dev_name(dev), count);
152
153	return count;
154}
155
156#else
157
158int omap_pm_get_dev_context_loss_count(struct device *dev)
159{
160	return dummy_context_loss_counter;
161}
162
163#endif
164
165/* Should be called before clk framework init */
166int __init omap_pm_if_early_init(void)
167{
168	return 0;
169}
170
171/* Must be called after clock framework is initialized */
172int __init omap_pm_if_init(void)
173{
174	return 0;
175}
176