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c80705aa70
Implement OMAP PM layer omap_pm_get_dev_context_loss_count() API by
creating similar APIs at the omap_device and omap_hwmod levels. The
omap_hwmod level call is the layer with access to the powerdomain
core, so it is the place where the powerdomain is queried to get the
context loss count.
The new APIs return an unsigned value that can wrap as the
context-loss count grows. However, the wrapping is not important as
the role of this function is to determine context loss by checking for
any difference in subsequent calls to this function.
Note that these APIs at each level can return zero when no context
loss is detected, or on errors. This is to avoid returning error
codes which could potentially be mistaken for large context loss
counters.
NOTE: only works for devices which have been converted to use
omap_device/omap_hwmod.
Longer term, we could possibly remove this API from the OMAP PM layer,
and instead directly use the omap_device level API.
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
154 lines
4.9 KiB
C
154 lines
4.9 KiB
C
/*
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* omap_device headers
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*
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* Copyright (C) 2009 Nokia Corporation
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* Paul Walmsley
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*
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* Developed in collaboration with (alphabetical order): Benoit
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* Cousson, Kevin Hilman, Tony Lindgren, Rajendra Nayak, Vikram
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* Pandita, Sakari Poussa, Anand Sawant, Santosh Shilimkar, Richard
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* Woodruff
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Eventually this type of functionality should either be
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* a) implemented via arch-specific pointers in platform_device
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* or
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* b) implemented as a proper omap_bus/omap_device in Linux, no more
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* platform_device
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*
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* omap_device differs from omap_hwmod in that it includes external
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* (e.g., board- and system-level) integration details. omap_hwmod
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* stores hardware data that is invariant for a given OMAP chip.
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*
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* To do:
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* - GPIO integration
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* - regulator integration
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*
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*/
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#ifndef __ARCH_ARM_PLAT_OMAP_INCLUDE_MACH_OMAP_DEVICE_H
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#define __ARCH_ARM_PLAT_OMAP_INCLUDE_MACH_OMAP_DEVICE_H
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <plat/omap_hwmod.h>
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extern struct device omap_device_parent;
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/* omap_device._state values */
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#define OMAP_DEVICE_STATE_UNKNOWN 0
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#define OMAP_DEVICE_STATE_ENABLED 1
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#define OMAP_DEVICE_STATE_IDLE 2
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#define OMAP_DEVICE_STATE_SHUTDOWN 3
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/**
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* struct omap_device - omap_device wrapper for platform_devices
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* @pdev: platform_device
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* @hwmods: (one .. many per omap_device)
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* @hwmods_cnt: ARRAY_SIZE() of @hwmods
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* @pm_lats: ptr to an omap_device_pm_latency table
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* @pm_lats_cnt: ARRAY_SIZE() of what is passed to @pm_lats
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* @pm_lat_level: array index of the last odpl entry executed - -1 if never
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* @dev_wakeup_lat: dev wakeup latency in nanoseconds
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* @_dev_wakeup_lat_limit: dev wakeup latency limit in nsec - set by OMAP PM
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* @_state: one of OMAP_DEVICE_STATE_* (see above)
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* @flags: device flags
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*
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* Integrates omap_hwmod data into Linux platform_device.
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*
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* Field names beginning with underscores are for the internal use of
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* the omap_device code.
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*
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*/
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struct omap_device {
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struct platform_device pdev;
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struct omap_hwmod **hwmods;
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struct omap_device_pm_latency *pm_lats;
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u32 dev_wakeup_lat;
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u32 _dev_wakeup_lat_limit;
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u8 pm_lats_cnt;
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s8 pm_lat_level;
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u8 hwmods_cnt;
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u8 _state;
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};
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/* Device driver interface (call via platform_data fn ptrs) */
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int omap_device_enable(struct platform_device *pdev);
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int omap_device_idle(struct platform_device *pdev);
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int omap_device_shutdown(struct platform_device *pdev);
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/* Core code interface */
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int omap_device_count_resources(struct omap_device *od);
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int omap_device_fill_resources(struct omap_device *od, struct resource *res);
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struct omap_device *omap_device_build(const char *pdev_name, int pdev_id,
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struct omap_hwmod *oh, void *pdata,
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int pdata_len,
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struct omap_device_pm_latency *pm_lats,
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int pm_lats_cnt, int is_early_device);
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struct omap_device *omap_device_build_ss(const char *pdev_name, int pdev_id,
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struct omap_hwmod **oh, int oh_cnt,
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void *pdata, int pdata_len,
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struct omap_device_pm_latency *pm_lats,
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int pm_lats_cnt, int is_early_device);
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int omap_device_register(struct omap_device *od);
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int omap_early_device_register(struct omap_device *od);
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void __iomem *omap_device_get_rt_va(struct omap_device *od);
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/* OMAP PM interface */
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int omap_device_align_pm_lat(struct platform_device *pdev,
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u32 new_wakeup_lat_limit);
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struct powerdomain *omap_device_get_pwrdm(struct omap_device *od);
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u32 omap_device_get_context_loss_count(struct platform_device *pdev);
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/* Other */
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int omap_device_idle_hwmods(struct omap_device *od);
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int omap_device_enable_hwmods(struct omap_device *od);
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int omap_device_disable_clocks(struct omap_device *od);
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int omap_device_enable_clocks(struct omap_device *od);
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/*
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* Entries should be kept in latency order ascending
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*
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* deact_lat is the maximum number of microseconds required to complete
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* deactivate_func() at the device's slowest OPP.
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*
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* act_lat is the maximum number of microseconds required to complete
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* activate_func() at the device's slowest OPP.
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*
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* This will result in some suboptimal power management decisions at fast
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* OPPs, but avoids having to recompute all device power management decisions
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* if the system shifts from a fast OPP to a slow OPP (in order to meet
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* latency requirements).
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*
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* XXX should deactivate_func/activate_func() take platform_device pointers
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* rather than omap_device pointers?
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*/
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struct omap_device_pm_latency {
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u32 deactivate_lat;
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u32 deactivate_lat_worst;
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int (*deactivate_func)(struct omap_device *od);
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u32 activate_lat;
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u32 activate_lat_worst;
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int (*activate_func)(struct omap_device *od);
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u32 flags;
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};
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#define OMAP_DEVICE_LATENCY_AUTO_ADJUST BIT(1)
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/* Get omap_device pointer from platform_device pointer */
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#define to_omap_device(x) container_of((x), struct omap_device, pdev)
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#endif
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