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TOMOYO Linux Cross Reference
Linux/arch/arm/plat-omap/include/plat/omap_device.h

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  1 /*
  2  * omap_device headers
  3  *
  4  * Copyright (C) 2009 Nokia Corporation
  5  * Paul Walmsley
  6  *
  7  * Developed in collaboration with (alphabetical order): Benoit
  8  * Cousson, Kevin Hilman, Tony Lindgren, Rajendra Nayak, Vikram
  9  * Pandita, Sakari Poussa, Anand Sawant, Santosh Shilimkar, Richard
 10  * Woodruff
 11  *
 12  * This program is free software; you can redistribute it and/or modify
 13  * it under the terms of the GNU General Public License version 2 as
 14  * published by the Free Software Foundation.
 15  *
 16  * Eventually this type of functionality should either be
 17  * a) implemented via arch-specific pointers in platform_device
 18  * or
 19  * b) implemented as a proper omap_bus/omap_device in Linux, no more
 20  *    platform_device
 21  *
 22  * omap_device differs from omap_hwmod in that it includes external
 23  * (e.g., board- and system-level) integration details.  omap_hwmod
 24  * stores hardware data that is invariant for a given OMAP chip.
 25  *
 26  * To do:
 27  * - GPIO integration
 28  * - regulator integration
 29  *
 30  */
 31 #ifndef __ARCH_ARM_PLAT_OMAP_INCLUDE_MACH_OMAP_DEVICE_H
 32 #define __ARCH_ARM_PLAT_OMAP_INCLUDE_MACH_OMAP_DEVICE_H
 33 
 34 #include <linux/kernel.h>
 35 #include <linux/platform_device.h>
 36 
 37 #include <plat/omap_hwmod.h>
 38 
 39 extern struct dev_pm_domain omap_device_pm_domain;
 40 
 41 /* omap_device._state values */
 42 #define OMAP_DEVICE_STATE_UNKNOWN       0
 43 #define OMAP_DEVICE_STATE_ENABLED       1
 44 #define OMAP_DEVICE_STATE_IDLE          2
 45 #define OMAP_DEVICE_STATE_SHUTDOWN      3
 46 
 47 /* omap_device.flags values */
 48 #define OMAP_DEVICE_SUSPENDED BIT(0)
 49 #define OMAP_DEVICE_NO_IDLE_ON_SUSPEND BIT(1)
 50 
 51 /**
 52  * struct omap_device - omap_device wrapper for platform_devices
 53  * @pdev: platform_device
 54  * @hwmods: (one .. many per omap_device)
 55  * @hwmods_cnt: ARRAY_SIZE() of @hwmods
 56  * @pm_lats: ptr to an omap_device_pm_latency table
 57  * @pm_lats_cnt: ARRAY_SIZE() of what is passed to @pm_lats
 58  * @pm_lat_level: array index of the last odpl entry executed - -1 if never
 59  * @dev_wakeup_lat: dev wakeup latency in nanoseconds
 60  * @_dev_wakeup_lat_limit: dev wakeup latency limit in nsec - set by OMAP PM
 61  * @_state: one of OMAP_DEVICE_STATE_* (see above)
 62  * @flags: device flags
 63  * @_driver_status: one of BUS_NOTIFY_*_DRIVER from <linux/device.h>
 64  *
 65  * Integrates omap_hwmod data into Linux platform_device.
 66  *
 67  * Field names beginning with underscores are for the internal use of
 68  * the omap_device code.
 69  *
 70  */
 71 struct omap_device {
 72         struct platform_device          *pdev;
 73         struct omap_hwmod               **hwmods;
 74         struct omap_device_pm_latency   *pm_lats;
 75         u32                             dev_wakeup_lat;
 76         u32                             _dev_wakeup_lat_limit;
 77         unsigned long                   _driver_status;
 78         u8                              pm_lats_cnt;
 79         s8                              pm_lat_level;
 80         u8                              hwmods_cnt;
 81         u8                              _state;
 82         u8                              flags;
 83 };
 84 
 85 /* Device driver interface (call via platform_data fn ptrs) */
 86 
 87 int omap_device_enable(struct platform_device *pdev);
 88 int omap_device_idle(struct platform_device *pdev);
 89 int omap_device_shutdown(struct platform_device *pdev);
 90 
 91 /* Core code interface */
 92 
 93 struct platform_device *omap_device_build(const char *pdev_name, int pdev_id,
 94                                       struct omap_hwmod *oh, void *pdata,
 95                                       int pdata_len,
 96                                       struct omap_device_pm_latency *pm_lats,
 97                                       int pm_lats_cnt, int is_early_device);
 98 
 99 struct platform_device *omap_device_build_ss(const char *pdev_name, int pdev_id,
100                                          struct omap_hwmod **oh, int oh_cnt,
101                                          void *pdata, int pdata_len,
102                                          struct omap_device_pm_latency *pm_lats,
103                                          int pm_lats_cnt, int is_early_device);
104 
105 struct omap_device *omap_device_alloc(struct platform_device *pdev,
106                                       struct omap_hwmod **ohs, int oh_cnt,
107                                       struct omap_device_pm_latency *pm_lats,
108                                       int pm_lats_cnt);
109 void omap_device_delete(struct omap_device *od);
110 int omap_device_register(struct platform_device *pdev);
111 
112 void __iomem *omap_device_get_rt_va(struct omap_device *od);
113 struct device *omap_device_get_by_hwmod_name(const char *oh_name);
114 
115 /* OMAP PM interface */
116 int omap_device_align_pm_lat(struct platform_device *pdev,
117                              u32 new_wakeup_lat_limit);
118 struct powerdomain *omap_device_get_pwrdm(struct omap_device *od);
119 int omap_device_get_context_loss_count(struct platform_device *pdev);
120 
121 /* Other */
122 
123 int omap_device_assert_hardreset(struct platform_device *pdev,
124                                  const char *name);
125 int omap_device_deassert_hardreset(struct platform_device *pdev,
126                                  const char *name);
127 int omap_device_idle_hwmods(struct omap_device *od);
128 int omap_device_enable_hwmods(struct omap_device *od);
129 
130 int omap_device_disable_clocks(struct omap_device *od);
131 int omap_device_enable_clocks(struct omap_device *od);
132 
133 /*
134  * Entries should be kept in latency order ascending
135  *
136  * deact_lat is the maximum number of microseconds required to complete
137  * deactivate_func() at the device's slowest OPP.
138  *
139  * act_lat is the maximum number of microseconds required to complete
140  * activate_func() at the device's slowest OPP.
141  *
142  * This will result in some suboptimal power management decisions at fast
143  * OPPs, but avoids having to recompute all device power management decisions
144  * if the system shifts from a fast OPP to a slow OPP (in order to meet
145  * latency requirements).
146  *
147  * XXX should deactivate_func/activate_func() take platform_device pointers
148  * rather than omap_device pointers?
149  */
150 struct omap_device_pm_latency {
151         u32 deactivate_lat;
152         u32 deactivate_lat_worst;
153         int (*deactivate_func)(struct omap_device *od);
154         u32 activate_lat;
155         u32 activate_lat_worst;
156         int (*activate_func)(struct omap_device *od);
157         u32 flags;
158 };
159 
160 #define OMAP_DEVICE_LATENCY_AUTO_ADJUST BIT(1)
161 
162 /* Get omap_device pointer from platform_device pointer */
163 static inline struct omap_device *to_omap_device(struct platform_device *pdev)
164 {
165         return pdev ? pdev->archdata.od : NULL;
166 }
167 
168 static inline
169 void omap_device_disable_idle_on_suspend(struct platform_device *pdev)
170 {
171         struct omap_device *od = to_omap_device(pdev);
172 
173         od->flags |= OMAP_DEVICE_NO_IDLE_ON_SUSPEND;
174 }
175 
176 #endif
177 

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