1130 lines
31 KiB
C
1130 lines
31 KiB
C
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/*
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* omap_device implementation
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*
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* Copyright (C) 2009-2010 Nokia Corporation
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* Paul Walmsley, Kevin Hilman
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*
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* Developed in collaboration with (alphabetical order): Benoit
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* Cousson, Thara Gopinath, 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/export.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/clk.h>
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#include <linux/clkdev.h>
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#include <linux/pm_runtime.h>
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#include <linux/of.h>
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#include <linux/notifier.h>
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#include <plat/omap_device.h>
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#include <plat/omap_hwmod.h>
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#include <plat/clock.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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static int omap_early_device_register(struct platform_device *pdev);
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static struct omap_device_pm_latency omap_default_latency[] = {
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{
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.deactivate_func = omap_device_idle_hwmods,
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.activate_func = omap_device_enable_hwmods,
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.flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
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}
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};
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/* Private functions */
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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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struct timespec a, b, c;
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dev_dbg(&od->pdev->dev, "omap_device: activating\n");
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while (od->pm_lat_level > 0) {
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struct omap_device_pm_latency *odpl;
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unsigned long long 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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read_persistent_clock(&a);
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/* XXX check return code */
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odpl->activate_func(od);
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read_persistent_clock(&b);
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c = timespec_sub(b, a);
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act_lat = timespec_to_ns(&c);
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dev_dbg(&od->pdev->dev,
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"omap_device: pm_lat %d: activate: elapsed time "
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"%llu nsec\n", od->pm_lat_level, act_lat);
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if (act_lat > odpl->activate_lat) {
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odpl->activate_lat_worst = act_lat;
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if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
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odpl->activate_lat = act_lat;
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dev_dbg(&od->pdev->dev,
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"new worst case activate latency "
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"%d: %llu\n",
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od->pm_lat_level, act_lat);
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} else
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dev_warn(&od->pdev->dev,
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"activate latency %d "
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"higher than exptected. (%llu > %d)\n",
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od->pm_lat_level, act_lat,
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odpl->activate_lat);
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}
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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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struct timespec a, b, c;
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dev_dbg(&od->pdev->dev, "omap_device: deactivating\n");
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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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unsigned long long 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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read_persistent_clock(&a);
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/* XXX check return code */
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odpl->deactivate_func(od);
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read_persistent_clock(&b);
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c = timespec_sub(b, a);
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deact_lat = timespec_to_ns(&c);
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dev_dbg(&od->pdev->dev,
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"omap_device: pm_lat %d: deactivate: elapsed time "
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"%llu nsec\n", od->pm_lat_level, deact_lat);
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if (deact_lat > odpl->deactivate_lat) {
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odpl->deactivate_lat_worst = deact_lat;
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if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
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odpl->deactivate_lat = deact_lat;
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dev_dbg(&od->pdev->dev,
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"new worst case deactivate latency "
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"%d: %llu\n",
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od->pm_lat_level, deact_lat);
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} else
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dev_warn(&od->pdev->dev,
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"deactivate latency %d "
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"higher than exptected. (%llu > %d)\n",
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od->pm_lat_level, deact_lat,
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odpl->deactivate_lat);
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}
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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 void _add_clkdev(struct omap_device *od, const char *clk_alias,
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const char *clk_name)
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{
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struct clk *r;
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struct clk_lookup *l;
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if (!clk_alias || !clk_name)
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return;
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dev_dbg(&od->pdev->dev, "Creating %s -> %s\n", clk_alias, clk_name);
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r = clk_get_sys(dev_name(&od->pdev->dev), clk_alias);
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if (!IS_ERR(r)) {
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dev_warn(&od->pdev->dev,
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"alias %s already exists\n", clk_alias);
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clk_put(r);
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return;
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}
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r = omap_clk_get_by_name(clk_name);
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if (IS_ERR(r)) {
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dev_err(&od->pdev->dev,
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"omap_clk_get_by_name for %s failed\n", clk_name);
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return;
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}
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l = clkdev_alloc(r, clk_alias, dev_name(&od->pdev->dev));
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if (!l) {
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dev_err(&od->pdev->dev,
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"clkdev_alloc for %s failed\n", clk_alias);
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return;
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}
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clkdev_add(l);
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}
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/**
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* _add_hwmod_clocks_clkdev - Add clkdev entry for hwmod optional clocks
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* and main clock
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* @od: struct omap_device *od
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* @oh: struct omap_hwmod *oh
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*
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* For the main clock and every optional clock present per hwmod per
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* omap_device, this function adds an entry in the clkdev table of the
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* form <dev-id=dev_name, con-id=role> if it does not exist already.
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*
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* The function is called from inside omap_device_build_ss(), after
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* omap_device_register.
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*
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* This allows drivers to get a pointer to its optional clocks based on its role
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* by calling clk_get(<dev*>, <role>).
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* In the case of the main clock, a "fck" alias is used.
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*
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* No return value.
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*/
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static void _add_hwmod_clocks_clkdev(struct omap_device *od,
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struct omap_hwmod *oh)
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{
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int i;
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_add_clkdev(od, "fck", oh->main_clk);
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for (i = 0; i < oh->opt_clks_cnt; i++)
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_add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk);
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}
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/**
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* omap_device_build_from_dt - build an omap_device with multiple hwmods
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* @pdev_name: name of the platform_device driver to use
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* @pdev_id: this platform_device's connection ID
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* @oh: ptr to the single omap_hwmod that backs this omap_device
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* @pdata: platform_data ptr to associate with the platform_device
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* @pdata_len: amount of memory pointed to by @pdata
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* @pm_lats: pointer to a omap_device_pm_latency array for this device
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* @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
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* @is_early_device: should the device be registered as an early device or not
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*
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* Function for building an omap_device already registered from device-tree
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*
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* Returns 0 or PTR_ERR() on error.
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*/
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static int omap_device_build_from_dt(struct platform_device *pdev)
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{
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struct omap_hwmod **hwmods;
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struct omap_device *od;
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struct omap_hwmod *oh;
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struct device_node *node = pdev->dev.of_node;
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const char *oh_name;
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int oh_cnt, i, ret = 0;
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oh_cnt = of_property_count_strings(node, "ti,hwmods");
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if (!oh_cnt || IS_ERR_VALUE(oh_cnt)) {
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dev_dbg(&pdev->dev, "No 'hwmods' to build omap_device\n");
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return -ENODEV;
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}
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hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
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if (!hwmods) {
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ret = -ENOMEM;
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goto odbfd_exit;
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}
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for (i = 0; i < oh_cnt; i++) {
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of_property_read_string_index(node, "ti,hwmods", i, &oh_name);
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oh = omap_hwmod_lookup(oh_name);
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if (!oh) {
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dev_err(&pdev->dev, "Cannot lookup hwmod '%s'\n",
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oh_name);
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ret = -EINVAL;
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goto odbfd_exit1;
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}
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hwmods[i] = oh;
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}
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od = omap_device_alloc(pdev, hwmods, oh_cnt, NULL, 0);
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if (!od) {
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dev_err(&pdev->dev, "Cannot allocate omap_device for :%s\n",
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oh_name);
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ret = PTR_ERR(od);
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goto odbfd_exit1;
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}
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if (of_get_property(node, "ti,no_idle_on_suspend", NULL))
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omap_device_disable_idle_on_suspend(pdev);
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pdev->dev.pm_domain = &omap_device_pm_domain;
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odbfd_exit1:
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kfree(hwmods);
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odbfd_exit:
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return ret;
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}
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static int _omap_device_notifier_call(struct notifier_block *nb,
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unsigned long event, void *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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switch (event) {
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case BUS_NOTIFY_ADD_DEVICE:
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if (pdev->dev.of_node)
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omap_device_build_from_dt(pdev);
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break;
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case BUS_NOTIFY_DEL_DEVICE:
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if (pdev->archdata.od)
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omap_device_delete(pdev->archdata.od);
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break;
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}
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return NOTIFY_DONE;
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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_get_context_loss_count - get lost context count
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* @od: struct omap_device *
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*
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* Using the primary hwmod, query the context loss count for this
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* device.
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*
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* Callers should consider context for this device lost any time this
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* function returns a value different than the value the caller got
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* the last time it called this function.
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*
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* If any hwmods exist for the omap_device assoiated with @pdev,
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* return the context loss counter for that hwmod, otherwise return
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* zero.
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*/
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int omap_device_get_context_loss_count(struct platform_device *pdev)
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{
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struct omap_device *od;
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u32 ret = 0;
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od = to_omap_device(pdev);
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if (od->hwmods_cnt)
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ret = omap_hwmod_get_context_loss_count(od->hwmods[0]);
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return ret;
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}
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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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static int omap_device_count_resources(struct omap_device *od)
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{
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int c = 0;
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int i;
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for (i = 0; i < od->hwmods_cnt; i++)
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c += omap_hwmod_count_resources(od->hwmods[i]);
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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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/**
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* omap_device_fill_resources - fill in array of struct resource
|
|
* @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().
|
|
* Ideally this function would not be needed at all. If omap_device
|
|
* 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
|
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* functions to get device resources. Hacking around the existing
|
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* platform_device code wastes memory. Returns 0.
|
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*/
|
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static int omap_device_fill_resources(struct omap_device *od,
|
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struct resource *res)
|
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{
|
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int c = 0;
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int i, r;
|
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for (i = 0; i < od->hwmods_cnt; i++) {
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r = omap_hwmod_fill_resources(od->hwmods[i], res);
|
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res += r;
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c += r;
|
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}
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|
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return 0;
|
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}
|
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|
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/**
|
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* omap_device_alloc - allocate an omap_device
|
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* @pdev: platform_device that will be included in this omap_device
|
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* @oh: ptr to the single omap_hwmod that backs this omap_device
|
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* @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 allocating an omap_device structure and filling
|
|
* hwmods, resources and pm_latency attributes.
|
|
*
|
|
* Returns an struct omap_device pointer or ERR_PTR() on error;
|
|
*/
|
|
struct omap_device *omap_device_alloc(struct platform_device *pdev,
|
|
struct omap_hwmod **ohs, int oh_cnt,
|
|
struct omap_device_pm_latency *pm_lats,
|
|
int pm_lats_cnt)
|
|
{
|
|
int ret = -ENOMEM;
|
|
struct omap_device *od;
|
|
struct resource *res = NULL;
|
|
int i, res_count;
|
|
struct omap_hwmod **hwmods;
|
|
|
|
od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
|
|
if (!od) {
|
|
ret = -ENOMEM;
|
|
goto oda_exit1;
|
|
}
|
|
od->hwmods_cnt = oh_cnt;
|
|
|
|
hwmods = kmemdup(ohs, sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
|
|
if (!hwmods)
|
|
goto oda_exit2;
|
|
|
|
od->hwmods = hwmods;
|
|
od->pdev = pdev;
|
|
|
|
/*
|
|
* HACK: Ideally the resources from DT should match, and hwmod
|
|
* should just add the missing ones. Since the name is not
|
|
* properly populated by DT, stick to hwmod resources only.
|
|
*/
|
|
if (pdev->num_resources && pdev->resource)
|
|
dev_warn(&pdev->dev, "%s(): resources already allocated %d\n",
|
|
__func__, pdev->num_resources);
|
|
|
|
res_count = omap_device_count_resources(od);
|
|
if (res_count > 0) {
|
|
dev_dbg(&pdev->dev, "%s(): resources allocated from hwmod %d\n",
|
|
__func__, res_count);
|
|
res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL);
|
|
if (!res)
|
|
goto oda_exit3;
|
|
|
|
omap_device_fill_resources(od, res);
|
|
|
|
ret = platform_device_add_resources(pdev, res, res_count);
|
|
kfree(res);
|
|
|
|
if (ret)
|
|
goto oda_exit3;
|
|
}
|
|
|
|
if (!pm_lats) {
|
|
pm_lats = omap_default_latency;
|
|
pm_lats_cnt = ARRAY_SIZE(omap_default_latency);
|
|
}
|
|
|
|
od->pm_lats_cnt = pm_lats_cnt;
|
|
od->pm_lats = kmemdup(pm_lats,
|
|
sizeof(struct omap_device_pm_latency) * pm_lats_cnt,
|
|
GFP_KERNEL);
|
|
if (!od->pm_lats)
|
|
goto oda_exit3;
|
|
|
|
pdev->archdata.od = od;
|
|
|
|
for (i = 0; i < oh_cnt; i++) {
|
|
hwmods[i]->od = od;
|
|
_add_hwmod_clocks_clkdev(od, hwmods[i]);
|
|
}
|
|
|
|
return od;
|
|
|
|
oda_exit3:
|
|
kfree(hwmods);
|
|
oda_exit2:
|
|
kfree(od);
|
|
oda_exit1:
|
|
dev_err(&pdev->dev, "omap_device: build failed (%d)\n", ret);
|
|
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
void omap_device_delete(struct omap_device *od)
|
|
{
|
|
if (!od)
|
|
return;
|
|
|
|
od->pdev->archdata.od = NULL;
|
|
kfree(od->pm_lats);
|
|
kfree(od->hwmods);
|
|
kfree(od);
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
* @is_early_device: should the device be registered as an early device or not
|
|
*
|
|
* 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 platform_device __init *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, int is_early_device)
|
|
{
|
|
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,
|
|
is_early_device);
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
* @is_early_device: should the device be registered as an early device or not
|
|
*
|
|
* 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 platform_device __init *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 is_early_device)
|
|
{
|
|
int ret = -ENOMEM;
|
|
struct platform_device *pdev;
|
|
struct omap_device *od;
|
|
|
|
if (!ohs || oh_cnt == 0 || !pdev_name)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (!pdata && pdata_len > 0)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
pdev = platform_device_alloc(pdev_name, pdev_id);
|
|
if (!pdev) {
|
|
ret = -ENOMEM;
|
|
goto odbs_exit;
|
|
}
|
|
|
|
/* Set the dev_name early to allow dev_xxx in omap_device_alloc */
|
|
if (pdev->id != -1)
|
|
dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
|
|
else
|
|
dev_set_name(&pdev->dev, "%s", pdev->name);
|
|
|
|
od = omap_device_alloc(pdev, ohs, oh_cnt, pm_lats, pm_lats_cnt);
|
|
if (!od)
|
|
goto odbs_exit1;
|
|
|
|
ret = platform_device_add_data(pdev, pdata, pdata_len);
|
|
if (ret)
|
|
goto odbs_exit2;
|
|
|
|
if (is_early_device)
|
|
ret = omap_early_device_register(pdev);
|
|
else
|
|
ret = omap_device_register(pdev);
|
|
if (ret)
|
|
goto odbs_exit2;
|
|
|
|
return pdev;
|
|
|
|
odbs_exit2:
|
|
omap_device_delete(od);
|
|
odbs_exit1:
|
|
platform_device_put(pdev);
|
|
odbs_exit:
|
|
|
|
pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret);
|
|
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
/**
|
|
* omap_early_device_register - register an omap_device as an early platform
|
|
* device.
|
|
* @od: struct omap_device * to register
|
|
*
|
|
* Register the omap_device structure. This currently just calls
|
|
* platform_early_add_device() on the underlying platform_device.
|
|
* Returns 0 by default.
|
|
*/
|
|
static int __init omap_early_device_register(struct platform_device *pdev)
|
|
{
|
|
struct platform_device *devices[1];
|
|
|
|
devices[0] = pdev;
|
|
early_platform_add_devices(devices, 1);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_RUNTIME
|
|
static int _od_runtime_suspend(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
int ret;
|
|
|
|
ret = pm_generic_runtime_suspend(dev);
|
|
|
|
if (!ret)
|
|
omap_device_idle(pdev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int _od_runtime_idle(struct device *dev)
|
|
{
|
|
return pm_generic_runtime_idle(dev);
|
|
}
|
|
|
|
static int _od_runtime_resume(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
|
|
omap_device_enable(pdev);
|
|
|
|
return pm_generic_runtime_resume(dev);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_SUSPEND
|
|
static int _od_suspend_noirq(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct omap_device *od = to_omap_device(pdev);
|
|
int ret;
|
|
|
|
ret = pm_generic_suspend_noirq(dev);
|
|
|
|
if (!ret && !pm_runtime_status_suspended(dev)) {
|
|
if (pm_generic_runtime_suspend(dev) == 0) {
|
|
if (!(od->flags & OMAP_DEVICE_NO_IDLE_ON_SUSPEND))
|
|
omap_device_idle(pdev);
|
|
od->flags |= OMAP_DEVICE_SUSPENDED;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int _od_resume_noirq(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct omap_device *od = to_omap_device(pdev);
|
|
|
|
if ((od->flags & OMAP_DEVICE_SUSPENDED) &&
|
|
!pm_runtime_status_suspended(dev)) {
|
|
od->flags &= ~OMAP_DEVICE_SUSPENDED;
|
|
if (!(od->flags & OMAP_DEVICE_NO_IDLE_ON_SUSPEND))
|
|
omap_device_enable(pdev);
|
|
pm_generic_runtime_resume(dev);
|
|
}
|
|
|
|
return pm_generic_resume_noirq(dev);
|
|
}
|
|
#else
|
|
#define _od_suspend_noirq NULL
|
|
#define _od_resume_noirq NULL
|
|
#endif
|
|
|
|
struct dev_pm_domain omap_device_pm_domain = {
|
|
.ops = {
|
|
SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,
|
|
_od_runtime_idle)
|
|
USE_PLATFORM_PM_SLEEP_OPS
|
|
.suspend_noirq = _od_suspend_noirq,
|
|
.resume_noirq = _od_resume_noirq,
|
|
}
|
|
};
|
|
|
|
/**
|
|
* 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 platform_device *pdev)
|
|
{
|
|
pr_debug("omap_device: %s: registering\n", pdev->name);
|
|
|
|
pdev->dev.pm_domain = &omap_device_pm_domain;
|
|
return platform_device_add(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 = to_omap_device(pdev);
|
|
|
|
if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
|
|
dev_warn(&pdev->dev,
|
|
"omap_device: %s() called from invalid state %d\n",
|
|
__func__, od->_state);
|
|
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 = UINT_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 = to_omap_device(pdev);
|
|
|
|
if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
|
|
dev_warn(&pdev->dev,
|
|
"omap_device: %s() called from invalid state %d\n",
|
|
__func__, od->_state);
|
|
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;
|
|
|
|
od = to_omap_device(pdev);
|
|
|
|
if (od->_state != OMAP_DEVICE_STATE_ENABLED &&
|
|
od->_state != OMAP_DEVICE_STATE_IDLE) {
|
|
dev_warn(&pdev->dev,
|
|
"omap_device: %s() called from invalid state %d\n",
|
|
__func__, od->_state);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = _omap_device_deactivate(od, IGNORE_WAKEUP_LAT);
|
|
|
|
for (i = 0; i < od->hwmods_cnt; i++)
|
|
omap_hwmod_shutdown(od->hwmods[i]);
|
|
|
|
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 = to_omap_device(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]);
|
|
}
|
|
|
|
/**
|
|
* omap_device_get_mpu_rt_va - return the MPU's virtual addr for the hwmod base
|
|
* @od: struct omap_device *
|
|
*
|
|
* Return the MPU's virtual address for the base of the hwmod, from
|
|
* the ioremap() that the hwmod code does. Only valid if there is one
|
|
* hwmod associated with this device. Returns NULL if there are zero
|
|
* or more than one hwmods associated with this omap_device;
|
|
* otherwise, passes along the return value from
|
|
* omap_hwmod_get_mpu_rt_va().
|
|
*/
|
|
void __iomem *omap_device_get_rt_va(struct omap_device *od)
|
|
{
|
|
if (od->hwmods_cnt != 1)
|
|
return NULL;
|
|
|
|
return omap_hwmod_get_mpu_rt_va(od->hwmods[0]);
|
|
}
|
|
|
|
/**
|
|
* omap_device_get_by_hwmod_name() - convert a hwmod name to
|
|
* device pointer.
|
|
* @oh_name: name of the hwmod device
|
|
*
|
|
* Returns back a struct device * pointer associated with a hwmod
|
|
* device represented by a hwmod_name
|
|
*/
|
|
struct device *omap_device_get_by_hwmod_name(const char *oh_name)
|
|
{
|
|
struct omap_hwmod *oh;
|
|
|
|
if (!oh_name) {
|
|
WARN(1, "%s: no hwmod name!\n", __func__);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
oh = omap_hwmod_lookup(oh_name);
|
|
if (IS_ERR_OR_NULL(oh)) {
|
|
WARN(1, "%s: no hwmod for %s\n", __func__,
|
|
oh_name);
|
|
return ERR_PTR(oh ? PTR_ERR(oh) : -ENODEV);
|
|
}
|
|
if (IS_ERR_OR_NULL(oh->od)) {
|
|
WARN(1, "%s: no omap_device for %s\n", __func__,
|
|
oh_name);
|
|
return ERR_PTR(oh->od ? PTR_ERR(oh->od) : -ENODEV);
|
|
}
|
|
|
|
if (IS_ERR_OR_NULL(oh->od->pdev))
|
|
return ERR_PTR(oh->od->pdev ? PTR_ERR(oh->od->pdev) : -ENODEV);
|
|
|
|
return &oh->od->pdev->dev;
|
|
}
|
|
EXPORT_SYMBOL(omap_device_get_by_hwmod_name);
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < od->hwmods_cnt; i++)
|
|
omap_hwmod_enable(od->hwmods[i]);
|
|
|
|
/* 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)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < od->hwmods_cnt; i++)
|
|
omap_hwmod_idle(od->hwmods[i]);
|
|
|
|
/* 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)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < od->hwmods_cnt; i++)
|
|
omap_hwmod_disable_clocks(od->hwmods[i]);
|
|
|
|
/* 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)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < od->hwmods_cnt; i++)
|
|
omap_hwmod_enable_clocks(od->hwmods[i]);
|
|
|
|
/* XXX pass along return value here? */
|
|
return 0;
|
|
}
|
|
|
|
static struct notifier_block platform_nb = {
|
|
.notifier_call = _omap_device_notifier_call,
|
|
};
|
|
|
|
static int __init omap_device_init(void)
|
|
{
|
|
bus_register_notifier(&platform_bus_type, &platform_nb);
|
|
return 0;
|
|
}
|
|
core_initcall(omap_device_init);
|