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
28 static bool off_mode_enabled;
29 static int dummy_context_loss_counter;
30
31 /*
32 * Device-driver-originated constraints (via board-*.c files)
33 */
34
omap_pm_set_max_mpu_wakeup_lat(struct device * dev,long t)35 int 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
omap_pm_set_min_bus_tput(struct device * dev,u8 agent_id,unsigned long r)63 int 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 */
omap_pm_enable_off_mode(void)100 void 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 */
omap_pm_disable_off_mode(void)111 void 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
omap_pm_get_dev_context_loss_count(struct device * dev)122 int 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
omap_pm_get_dev_context_loss_count(struct device * dev)158 int 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 */
omap_pm_if_early_init(void)166 int __init omap_pm_if_early_init(void)
167 {
168 return 0;
169 }
170
171 /* Must be called after clock framework is initialized */
omap_pm_if_init(void)172 int __init omap_pm_if_init(void)
173 {
174 return 0;
175 }
176