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OMAP2/3/4 core: create omap_device layer
The omap_device code provides a mapping of omap_hwmod structures into the platform_device system, and includes some details on external (board-level) integration. This allows drivers to enable, idle, and shutdown on-chip device resources, including clocks, regulators, etc. The resources enabled and idled are dependent on the device's maximum wakeup latency constraint (if present). At the moment, omap_device functions are intended to be called from platform_data function pointers. Ideally in the future these functions will be called from either subarchitecture-specific platform_data activate, deactivate functions, or via an custom bus/device type for OMAP. Signed-off-by: Paul Walmsley <paul@pwsan.com> Cc: Benoit Cousson <b-cousson@ti.com> Cc: Kevin Hilman <khilman@deeprootsystems.com> Cc: Tony Lindgren <tony@atomide.com> Cc: Rajendra Nayak <rnayak@ti.com> Cc: Vikram Pandita <vikram.pandita@ti.com> Cc: Sakari Poussa <sakari.poussa@nokia.com> Cc: Anand Sawant <sawant@ti.com> Cc: Santosh Shilimkar <santosh.shilimkar@ti.com> Cc: Eric Thomas <ethomas@ti.com> Cc: Richard Woodruff <r-woodruff2@ti.com>
This commit is contained in:
Paul Walmsley
paul
parent
02bfc030e4
commit
b04b65ab5b
@ -12,6 +12,10 @@ obj- :=
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# OCPI interconnect support for 1710, 1610 and 5912
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obj-$(CONFIG_ARCH_OMAP16XX) += ocpi.o
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# omap_device support (OMAP2+ only at the moment)
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obj-$(CONFIG_ARCH_OMAP2) += omap_device.o
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obj-$(CONFIG_ARCH_OMAP3) += omap_device.o
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obj-$(CONFIG_OMAP_MCBSP) += mcbsp.o
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obj-$(CONFIG_OMAP_IOMMU) += iommu.o iovmm.o
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obj-$(CONFIG_OMAP_IOMMU_DEBUG) += iommu-debug.o
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141
arch/arm/plat-omap/include/mach/omap_device.h
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141
arch/arm/plat-omap/include/mach/omap_device.h
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@ -0,0 +1,141 @@
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/*
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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 <mach/omap_hwmod.h>
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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 microseconds
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* @_dev_wakeup_lat_limit: dev wakeup latency limit in usec - 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);
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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);
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int omap_device_register(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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/* 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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int (*deactivate_func)(struct omap_device *od);
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u32 activate_lat;
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int (*activate_func)(struct omap_device *od);
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};
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#endif
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687
arch/arm/plat-omap/omap_device.c
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687
arch/arm/plat-omap/omap_device.c
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@ -0,0 +1,687 @@
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/*
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* omap_device implementation
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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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* This code provides a consistent interface for OMAP device drivers
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* to control power management and interconnect properties of their
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* devices.
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*
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* In the medium- to long-term, this code should either be
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* a) implemented via arch-specific pointers in platform_data
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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_data func pointers
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*
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*
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* Guidelines for usage by driver authors:
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*
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* 1. These functions are intended to be used by device drivers via
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* function pointers in struct platform_data. As an example,
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* omap_device_enable() should be passed to the driver as
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*
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* struct foo_driver_platform_data {
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* ...
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* int (*device_enable)(struct platform_device *pdev);
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* ...
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* }
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*
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* Note that the generic "device_enable" name is used, rather than
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* "omap_device_enable". This is so other architectures can pass in their
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* own enable/disable functions here.
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*
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* This should be populated during device setup:
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*
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* ...
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* pdata->device_enable = omap_device_enable;
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* ...
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*
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* 2. Drivers should first check to ensure the function pointer is not null
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* before calling it, as in:
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*
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* if (pdata->device_enable)
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* pdata->device_enable(pdev);
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*
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* This allows other architectures that don't use similar device_enable()/
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* device_shutdown() functions to execute normally.
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*
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* ...
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*
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* Suggested usage by device drivers:
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*
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* During device initialization:
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* device_enable()
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*
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* During device idle:
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* (save remaining device context if necessary)
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* device_idle();
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*
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* During device resume:
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* device_enable();
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* (restore context if necessary)
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*
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* During device shutdown:
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* device_shutdown()
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* (device must be reinitialized at this point to use it again)
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*
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*/
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#undef DEBUG
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <mach/omap_device.h>
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#include <mach/omap_hwmod.h>
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/* These parameters are passed to _omap_device_{de,}activate() */
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#define USE_WAKEUP_LAT 0
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#define IGNORE_WAKEUP_LAT 1
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/* XXX this should be moved into a separate file */
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#if defined(CONFIG_ARCH_OMAP2420)
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# define OMAP_32KSYNCT_BASE 0x48004000
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#elif defined(CONFIG_ARCH_OMAP2430)
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# define OMAP_32KSYNCT_BASE 0x49020000
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#elif defined(CONFIG_ARCH_OMAP3430)
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# define OMAP_32KSYNCT_BASE 0x48320000
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#else
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# error Unknown OMAP device
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#endif
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/* Private functions */
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/**
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* _read_32ksynct - read the OMAP 32K sync timer
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*
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* Returns the current value of the 32KiHz synchronization counter.
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* XXX this should be generalized to simply read the system clocksource.
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* XXX this should be moved to a separate synctimer32k.c file
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*/
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static u32 _read_32ksynct(void)
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{
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if (!cpu_class_is_omap2())
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BUG();
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return __raw_readl(OMAP2_IO_ADDRESS(OMAP_32KSYNCT_BASE + 0x010));
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}
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/**
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* _omap_device_activate - increase device readiness
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* @od: struct omap_device *
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* @ignore_lat: increase to latency target (0) or full readiness (1)?
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*
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* Increase readiness of omap_device @od (thus decreasing device
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* wakeup latency, but consuming more power). If @ignore_lat is
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* IGNORE_WAKEUP_LAT, make the omap_device fully active. Otherwise,
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* if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup
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* latency is greater than the requested maximum wakeup latency, step
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* backwards in the omap_device_pm_latency table to ensure the
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* device's maximum wakeup latency is less than or equal to the
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* requested maximum wakeup latency. Returns 0.
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*/
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static int _omap_device_activate(struct omap_device *od, u8 ignore_lat)
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{
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u32 a, b;
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pr_debug("omap_device: %s: activating\n", od->pdev.name);
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while (od->pm_lat_level > 0) {
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struct omap_device_pm_latency *odpl;
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int act_lat = 0;
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od->pm_lat_level--;
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odpl = od->pm_lats + od->pm_lat_level;
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if (!ignore_lat &&
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(od->dev_wakeup_lat <= od->_dev_wakeup_lat_limit))
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break;
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a = _read_32ksynct();
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/* XXX check return code */
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odpl->activate_func(od);
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b = _read_32ksynct();
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act_lat = (b - a) >> 15; /* 32KiHz cycles to microseconds */
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pr_debug("omap_device: %s: pm_lat %d: activate: elapsed time "
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"%d usec\n", od->pdev.name, od->pm_lat_level, act_lat);
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WARN(act_lat > odpl->activate_lat, "omap_device: %s.%d: "
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"activate step %d took longer than expected (%d > %d)\n",
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od->pdev.name, od->pdev.id, od->pm_lat_level,
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act_lat, odpl->activate_lat);
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od->dev_wakeup_lat -= odpl->activate_lat;
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}
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return 0;
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}
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/**
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* _omap_device_deactivate - decrease device readiness
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* @od: struct omap_device *
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* @ignore_lat: decrease to latency target (0) or full inactivity (1)?
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*
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* Decrease readiness of omap_device @od (thus increasing device
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* wakeup latency, but conserving power). If @ignore_lat is
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* IGNORE_WAKEUP_LAT, make the omap_device fully inactive. Otherwise,
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* if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup
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* latency is less than the requested maximum wakeup latency, step
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* forwards in the omap_device_pm_latency table to ensure the device's
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* maximum wakeup latency is less than or equal to the requested
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* maximum wakeup latency. Returns 0.
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*/
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static int _omap_device_deactivate(struct omap_device *od, u8 ignore_lat)
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{
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u32 a, b;
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pr_debug("omap_device: %s: deactivating\n", od->pdev.name);
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while (od->pm_lat_level < od->pm_lats_cnt) {
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struct omap_device_pm_latency *odpl;
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int deact_lat = 0;
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odpl = od->pm_lats + od->pm_lat_level;
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if (!ignore_lat &&
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((od->dev_wakeup_lat + odpl->activate_lat) >
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od->_dev_wakeup_lat_limit))
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break;
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a = _read_32ksynct();
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/* XXX check return code */
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odpl->deactivate_func(od);
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b = _read_32ksynct();
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deact_lat = (b - a) >> 15; /* 32KiHz cycles to microseconds */
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pr_debug("omap_device: %s: pm_lat %d: deactivate: elapsed time "
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"%d usec\n", od->pdev.name, od->pm_lat_level,
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deact_lat);
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WARN(deact_lat > odpl->deactivate_lat, "omap_device: %s.%d: "
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"deactivate step %d took longer than expected (%d > %d)\n",
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od->pdev.name, od->pdev.id, od->pm_lat_level,
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deact_lat, odpl->deactivate_lat);
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od->dev_wakeup_lat += odpl->activate_lat;
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od->pm_lat_level++;
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}
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return 0;
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}
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static inline struct omap_device *_find_by_pdev(struct platform_device *pdev)
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{
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return container_of(pdev, struct omap_device, pdev);
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}
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/* Public functions for use by core code */
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/**
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* omap_device_count_resources - count number of struct resource entries needed
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* @od: struct omap_device *
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*
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* Count the number of struct resource entries needed for this
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* omap_device @od. Used by omap_device_build_ss() to determine how
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* much memory to allocate before calling
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* omap_device_fill_resources(). Returns the count.
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*/
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int omap_device_count_resources(struct omap_device *od)
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{
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struct omap_hwmod *oh;
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int c = 0;
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int i;
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for (i = 0, oh = *od->hwmods; i < od->hwmods_cnt; i++, oh++)
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c += omap_hwmod_count_resources(oh);
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pr_debug("omap_device: %s: counted %d total resources across %d "
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"hwmods\n", od->pdev.name, c, od->hwmods_cnt);
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return c;
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}
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/**
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* omap_device_fill_resources - fill in array of struct resource
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* @od: struct omap_device *
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* @res: pointer to an array of struct resource to be filled in
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*
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* Populate one or more empty struct resource pointed to by @res with
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* the resource data for this omap_device @od. Used by
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* omap_device_build_ss() after calling omap_device_count_resources().
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* Ideally this function would not be needed at all. If omap_device
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* replaces platform_device, then we can specify our own
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* get_resource()/ get_irq()/etc functions that use the underlying
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* omap_hwmod information. Or if platform_device is extended to use
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* subarchitecture-specific function pointers, the various
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* platform_device functions can simply call omap_device internal
|
||||
* functions to get device resources. Hacking around the existing
|
||||
* platform_device code wastes memory. Returns 0.
|
||||
*/
|
||||
int omap_device_fill_resources(struct omap_device *od, struct resource *res)
|
||||
{
|
||||
struct omap_hwmod *oh;
|
||||
int c = 0;
|
||||
int i, r;
|
||||
|
||||
for (i = 0, oh = *od->hwmods; i < od->hwmods_cnt; i++, oh++) {
|
||||
r = omap_hwmod_fill_resources(oh, res);
|
||||
res += r;
|
||||
c += r;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* omap_device_build - build and register an omap_device with one omap_hwmod
|
||||
* @pdev_name: name of the platform_device driver to use
|
||||
* @pdev_id: this platform_device's connection ID
|
||||
* @oh: ptr to the single omap_hwmod that backs this omap_device
|
||||
* @pdata: platform_data ptr to associate with the platform_device
|
||||
* @pdata_len: amount of memory pointed to by @pdata
|
||||
* @pm_lats: pointer to a omap_device_pm_latency array for this device
|
||||
* @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
|
||||
*
|
||||
* Convenience function for building and registering a single
|
||||
* omap_device record, which in turn builds and registers a
|
||||
* platform_device record. See omap_device_build_ss() for more
|
||||
* information. Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise,
|
||||
* passes along the return value of omap_device_build_ss().
|
||||
*/
|
||||
struct omap_device *omap_device_build(const char *pdev_name, int pdev_id,
|
||||
struct omap_hwmod *oh, void *pdata,
|
||||
int pdata_len,
|
||||
struct omap_device_pm_latency *pm_lats,
|
||||
int pm_lats_cnt)
|
||||
{
|
||||
struct omap_hwmod *ohs[] = { oh };
|
||||
|
||||
if (!oh)
|
||||
return ERR_PTR(-EINVAL);
|
||||
|
||||
return omap_device_build_ss(pdev_name, pdev_id, ohs, 1, pdata,
|
||||
pdata_len, pm_lats, pm_lats_cnt);
|
||||
}
|
||||
|
||||
/**
|
||||
* omap_device_build_ss - build and register an omap_device with multiple hwmods
|
||||
* @pdev_name: name of the platform_device driver to use
|
||||
* @pdev_id: this platform_device's connection ID
|
||||
* @oh: ptr to the single omap_hwmod that backs this omap_device
|
||||
* @pdata: platform_data ptr to associate with the platform_device
|
||||
* @pdata_len: amount of memory pointed to by @pdata
|
||||
* @pm_lats: pointer to a omap_device_pm_latency array for this device
|
||||
* @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
|
||||
*
|
||||
* Convenience function for building and registering an omap_device
|
||||
* subsystem record. Subsystem records consist of multiple
|
||||
* omap_hwmods. This function in turn builds and registers a
|
||||
* platform_device record. Returns an ERR_PTR() on error, or passes
|
||||
* along the return value of omap_device_register().
|
||||
*/
|
||||
struct omap_device *omap_device_build_ss(const char *pdev_name, int pdev_id,
|
||||
struct omap_hwmod **ohs, int oh_cnt,
|
||||
void *pdata, int pdata_len,
|
||||
struct omap_device_pm_latency *pm_lats,
|
||||
int pm_lats_cnt)
|
||||
{
|
||||
int ret = -ENOMEM;
|
||||
struct omap_device *od;
|
||||
char *pdev_name2;
|
||||
struct resource *res = NULL;
|
||||
int res_count;
|
||||
struct omap_hwmod **hwmods;
|
||||
|
||||
if (!ohs || oh_cnt == 0 || !pdev_name)
|
||||
return ERR_PTR(-EINVAL);
|
||||
|
||||
if (!pdata && pdata_len > 0)
|
||||
return ERR_PTR(-EINVAL);
|
||||
|
||||
pr_debug("omap_device: %s: building with %d hwmods\n", pdev_name,
|
||||
oh_cnt);
|
||||
|
||||
od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
|
||||
if (!od)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
od->hwmods_cnt = oh_cnt;
|
||||
|
||||
hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt,
|
||||
GFP_KERNEL);
|
||||
if (!hwmods)
|
||||
goto odbs_exit1;
|
||||
|
||||
memcpy(hwmods, ohs, sizeof(struct omap_hwmod *) * oh_cnt);
|
||||
od->hwmods = hwmods;
|
||||
|
||||
pdev_name2 = kzalloc(strlen(pdev_name) + 1, GFP_KERNEL);
|
||||
if (!pdev_name2)
|
||||
goto odbs_exit2;
|
||||
strcpy(pdev_name2, pdev_name);
|
||||
|
||||
od->pdev.name = pdev_name2;
|
||||
od->pdev.id = pdev_id;
|
||||
|
||||
res_count = omap_device_count_resources(od);
|
||||
if (res_count > 0) {
|
||||
res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL);
|
||||
if (!res)
|
||||
goto odbs_exit3;
|
||||
}
|
||||
omap_device_fill_resources(od, res);
|
||||
|
||||
od->pdev.num_resources = res_count;
|
||||
od->pdev.resource = res;
|
||||
|
||||
platform_device_add_data(&od->pdev, pdata, pdata_len);
|
||||
|
||||
od->pm_lats = pm_lats;
|
||||
od->pm_lats_cnt = pm_lats_cnt;
|
||||
|
||||
ret = omap_device_register(od);
|
||||
if (ret)
|
||||
goto odbs_exit4;
|
||||
|
||||
return od;
|
||||
|
||||
odbs_exit4:
|
||||
kfree(res);
|
||||
odbs_exit3:
|
||||
kfree(pdev_name2);
|
||||
odbs_exit2:
|
||||
kfree(hwmods);
|
||||
odbs_exit1:
|
||||
kfree(od);
|
||||
|
||||
pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret);
|
||||
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
|
||||
/**
|
||||
* omap_device_register - register an omap_device with one omap_hwmod
|
||||
* @od: struct omap_device * to register
|
||||
*
|
||||
* Register the omap_device structure. This currently just calls
|
||||
* platform_device_register() on the underlying platform_device.
|
||||
* Returns the return value of platform_device_register().
|
||||
*/
|
||||
int omap_device_register(struct omap_device *od)
|
||||
{
|
||||
pr_debug("omap_device: %s: registering\n", od->pdev.name);
|
||||
|
||||
return platform_device_register(&od->pdev);
|
||||
}
|
||||
|
||||
|
||||
/* Public functions for use by device drivers through struct platform_data */
|
||||
|
||||
/**
|
||||
* omap_device_enable - fully activate an omap_device
|
||||
* @od: struct omap_device * to activate
|
||||
*
|
||||
* Do whatever is necessary for the hwmods underlying omap_device @od
|
||||
* to be accessible and ready to operate. This generally involves
|
||||
* enabling clocks, setting SYSCONFIG registers; and in the future may
|
||||
* involve remuxing pins. Device drivers should call this function
|
||||
* (through platform_data function pointers) where they would normally
|
||||
* enable clocks, etc. Returns -EINVAL if called when the omap_device
|
||||
* is already enabled, or passes along the return value of
|
||||
* _omap_device_activate().
|
||||
*/
|
||||
int omap_device_enable(struct platform_device *pdev)
|
||||
{
|
||||
int ret;
|
||||
struct omap_device *od;
|
||||
|
||||
od = _find_by_pdev(pdev);
|
||||
|
||||
if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
|
||||
WARN(1, "omap_device: %s.%d: omap_device_enable() called from "
|
||||
"invalid state\n", od->pdev.name, od->pdev.id);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* Enable everything if we're enabling this device from scratch */
|
||||
if (od->_state == OMAP_DEVICE_STATE_UNKNOWN)
|
||||
od->pm_lat_level = od->pm_lats_cnt;
|
||||
|
||||
ret = _omap_device_activate(od, IGNORE_WAKEUP_LAT);
|
||||
|
||||
od->dev_wakeup_lat = 0;
|
||||
od->_dev_wakeup_lat_limit = INT_MAX;
|
||||
od->_state = OMAP_DEVICE_STATE_ENABLED;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* omap_device_idle - idle an omap_device
|
||||
* @od: struct omap_device * to idle
|
||||
*
|
||||
* Idle omap_device @od by calling as many .deactivate_func() entries
|
||||
* in the omap_device's pm_lats table as is possible without exceeding
|
||||
* the device's maximum wakeup latency limit, pm_lat_limit. Device
|
||||
* drivers should call this function (through platform_data function
|
||||
* pointers) where they would normally disable clocks after operations
|
||||
* complete, etc.. Returns -EINVAL if the omap_device is not
|
||||
* currently enabled, or passes along the return value of
|
||||
* _omap_device_deactivate().
|
||||
*/
|
||||
int omap_device_idle(struct platform_device *pdev)
|
||||
{
|
||||
int ret;
|
||||
struct omap_device *od;
|
||||
|
||||
od = _find_by_pdev(pdev);
|
||||
|
||||
if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
|
||||
WARN(1, "omap_device: %s.%d: omap_device_idle() called from "
|
||||
"invalid state\n", od->pdev.name, od->pdev.id);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
ret = _omap_device_deactivate(od, USE_WAKEUP_LAT);
|
||||
|
||||
od->_state = OMAP_DEVICE_STATE_IDLE;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* omap_device_shutdown - shut down an omap_device
|
||||
* @od: struct omap_device * to shut down
|
||||
*
|
||||
* Shut down omap_device @od by calling all .deactivate_func() entries
|
||||
* in the omap_device's pm_lats table and then shutting down all of
|
||||
* the underlying omap_hwmods. Used when a device is being "removed"
|
||||
* or a device driver is being unloaded. Returns -EINVAL if the
|
||||
* omap_device is not currently enabled or idle, or passes along the
|
||||
* return value of _omap_device_deactivate().
|
||||
*/
|
||||
int omap_device_shutdown(struct platform_device *pdev)
|
||||
{
|
||||
int ret, i;
|
||||
struct omap_device *od;
|
||||
struct omap_hwmod *oh;
|
||||
|
||||
od = _find_by_pdev(pdev);
|
||||
|
||||
if (od->_state != OMAP_DEVICE_STATE_ENABLED &&
|
||||
od->_state != OMAP_DEVICE_STATE_IDLE) {
|
||||
WARN(1, "omap_device: %s.%d: omap_device_shutdown() called "
|
||||
"from invalid state\n", od->pdev.name, od->pdev.id);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
ret = _omap_device_deactivate(od, IGNORE_WAKEUP_LAT);
|
||||
|
||||
for (i = 0, oh = *od->hwmods; i < od->hwmods_cnt; i++, oh++)
|
||||
omap_hwmod_shutdown(oh);
|
||||
|
||||
od->_state = OMAP_DEVICE_STATE_SHUTDOWN;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* omap_device_align_pm_lat - activate/deactivate device to match wakeup lat lim
|
||||
* @od: struct omap_device *
|
||||
*
|
||||
* When a device's maximum wakeup latency limit changes, call some of
|
||||
* the .activate_func or .deactivate_func function pointers in the
|
||||
* omap_device's pm_lats array to ensure that the device's maximum
|
||||
* wakeup latency is less than or equal to the new latency limit.
|
||||
* Intended to be called by OMAP PM code whenever a device's maximum
|
||||
* wakeup latency limit changes (e.g., via
|
||||
* omap_pm_set_dev_wakeup_lat()). Returns 0 if nothing needs to be
|
||||
* done (e.g., if the omap_device is not currently idle, or if the
|
||||
* wakeup latency is already current with the new limit) or passes
|
||||
* along the return value of _omap_device_deactivate() or
|
||||
* _omap_device_activate().
|
||||
*/
|
||||
int omap_device_align_pm_lat(struct platform_device *pdev,
|
||||
u32 new_wakeup_lat_limit)
|
||||
{
|
||||
int ret = -EINVAL;
|
||||
struct omap_device *od;
|
||||
|
||||
od = _find_by_pdev(pdev);
|
||||
|
||||
if (new_wakeup_lat_limit == od->dev_wakeup_lat)
|
||||
return 0;
|
||||
|
||||
od->_dev_wakeup_lat_limit = new_wakeup_lat_limit;
|
||||
|
||||
if (od->_state != OMAP_DEVICE_STATE_IDLE)
|
||||
return 0;
|
||||
else if (new_wakeup_lat_limit > od->dev_wakeup_lat)
|
||||
ret = _omap_device_deactivate(od, USE_WAKEUP_LAT);
|
||||
else if (new_wakeup_lat_limit < od->dev_wakeup_lat)
|
||||
ret = _omap_device_activate(od, USE_WAKEUP_LAT);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* omap_device_get_pwrdm - return the powerdomain * associated with @od
|
||||
* @od: struct omap_device *
|
||||
*
|
||||
* Return the powerdomain associated with the first underlying
|
||||
* omap_hwmod for this omap_device. Intended for use by core OMAP PM
|
||||
* code. Returns NULL on error or a struct powerdomain * upon
|
||||
* success.
|
||||
*/
|
||||
struct powerdomain *omap_device_get_pwrdm(struct omap_device *od)
|
||||
{
|
||||
/*
|
||||
* XXX Assumes that all omap_hwmod powerdomains are identical.
|
||||
* This may not necessarily be true. There should be a sanity
|
||||
* check in here to WARN() if any difference appears.
|
||||
*/
|
||||
if (!od->hwmods_cnt)
|
||||
return NULL;
|
||||
|
||||
return omap_hwmod_get_pwrdm(od->hwmods[0]);
|
||||
}
|
||||
|
||||
/*
|
||||
* Public functions intended for use in omap_device_pm_latency
|
||||
* .activate_func and .deactivate_func function pointers
|
||||
*/
|
||||
|
||||
/**
|
||||
* omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
|
||||
* @od: struct omap_device *od
|
||||
*
|
||||
* Enable all underlying hwmods. Returns 0.
|
||||
*/
|
||||
int omap_device_enable_hwmods(struct omap_device *od)
|
||||
{
|
||||
struct omap_hwmod *oh;
|
||||
int i;
|
||||
|
||||
for (i = 0, oh = *od->hwmods; i < od->hwmods_cnt; i++, oh++)
|
||||
omap_hwmod_enable(oh);
|
||||
|
||||
/* XXX pass along return value here? */
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods
|
||||
* @od: struct omap_device *od
|
||||
*
|
||||
* Idle all underlying hwmods. Returns 0.
|
||||
*/
|
||||
int omap_device_idle_hwmods(struct omap_device *od)
|
||||
{
|
||||
struct omap_hwmod *oh;
|
||||
int i;
|
||||
|
||||
for (i = 0, oh = *od->hwmods; i < od->hwmods_cnt; i++, oh++)
|
||||
omap_hwmod_idle(oh);
|
||||
|
||||
/* XXX pass along return value here? */
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* omap_device_disable_clocks - disable all main and interface clocks
|
||||
* @od: struct omap_device *od
|
||||
*
|
||||
* Disable the main functional clock and interface clock for all of the
|
||||
* omap_hwmods associated with the omap_device. Returns 0.
|
||||
*/
|
||||
int omap_device_disable_clocks(struct omap_device *od)
|
||||
{
|
||||
struct omap_hwmod *oh;
|
||||
int i;
|
||||
|
||||
for (i = 0, oh = *od->hwmods; i < od->hwmods_cnt; i++, oh++)
|
||||
omap_hwmod_disable_clocks(oh);
|
||||
|
||||
/* XXX pass along return value here? */
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* omap_device_enable_clocks - enable all main and interface clocks
|
||||
* @od: struct omap_device *od
|
||||
*
|
||||
* Enable the main functional clock and interface clock for all of the
|
||||
* omap_hwmods associated with the omap_device. Returns 0.
|
||||
*/
|
||||
int omap_device_enable_clocks(struct omap_device *od)
|
||||
{
|
||||
struct omap_hwmod *oh;
|
||||
int i;
|
||||
|
||||
for (i = 0, oh = *od->hwmods; i < od->hwmods_cnt; i++, oh++)
|
||||
omap_hwmod_enable_clocks(oh);
|
||||
|
||||
/* XXX pass along return value here? */
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user