![Paul Walmsley](/assets/img/avatar_default.png)
Add some missing credits for people who have contributed significant features or fixes. Signed-off-by: Paul Walmsley <paul@pwsan.com> Cc: BenoƮt Cousson <b-cousson@ti.com> Cc: Tero Kristo <tero.kristo@nokia.com> Cc: Kevin Hilman <khilman@deeprootsystems.com> Cc: Thara Gopinath <thara@ti.com>
733 lines
21 KiB
C
733 lines
21 KiB
C
/*
|
|
* omap_device implementation
|
|
*
|
|
* Copyright (C) 2009 Nokia Corporation
|
|
* Paul Walmsley, Kevin Hilman
|
|
*
|
|
* Developed in collaboration with (alphabetical order): Benoit
|
|
* Cousson, Thara Gopinath, Tony Lindgren, Rajendra Nayak, Vikram
|
|
* Pandita, Sakari Poussa, Anand Sawant, Santosh Shilimkar, Richard
|
|
* Woodruff
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This code provides a consistent interface for OMAP device drivers
|
|
* to control power management and interconnect properties of their
|
|
* devices.
|
|
*
|
|
* In the medium- to long-term, this code should either be
|
|
* a) implemented via arch-specific pointers in platform_data
|
|
* or
|
|
* b) implemented as a proper omap_bus/omap_device in Linux, no more
|
|
* platform_data func pointers
|
|
*
|
|
*
|
|
* Guidelines for usage by driver authors:
|
|
*
|
|
* 1. These functions are intended to be used by device drivers via
|
|
* function pointers in struct platform_data. As an example,
|
|
* omap_device_enable() should be passed to the driver as
|
|
*
|
|
* struct foo_driver_platform_data {
|
|
* ...
|
|
* int (*device_enable)(struct platform_device *pdev);
|
|
* ...
|
|
* }
|
|
*
|
|
* Note that the generic "device_enable" name is used, rather than
|
|
* "omap_device_enable". This is so other architectures can pass in their
|
|
* own enable/disable functions here.
|
|
*
|
|
* This should be populated during device setup:
|
|
*
|
|
* ...
|
|
* pdata->device_enable = omap_device_enable;
|
|
* ...
|
|
*
|
|
* 2. Drivers should first check to ensure the function pointer is not null
|
|
* before calling it, as in:
|
|
*
|
|
* if (pdata->device_enable)
|
|
* pdata->device_enable(pdev);
|
|
*
|
|
* This allows other architectures that don't use similar device_enable()/
|
|
* device_shutdown() functions to execute normally.
|
|
*
|
|
* ...
|
|
*
|
|
* Suggested usage by device drivers:
|
|
*
|
|
* During device initialization:
|
|
* device_enable()
|
|
*
|
|
* During device idle:
|
|
* (save remaining device context if necessary)
|
|
* device_idle();
|
|
*
|
|
* During device resume:
|
|
* device_enable();
|
|
* (restore context if necessary)
|
|
*
|
|
* During device shutdown:
|
|
* device_shutdown()
|
|
* (device must be reinitialized at this point to use it again)
|
|
*
|
|
*/
|
|
#undef DEBUG
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/err.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <plat/omap_device.h>
|
|
#include <plat/omap_hwmod.h>
|
|
|
|
/* These parameters are passed to _omap_device_{de,}activate() */
|
|
#define USE_WAKEUP_LAT 0
|
|
#define IGNORE_WAKEUP_LAT 1
|
|
|
|
|
|
#define OMAP_DEVICE_MAGIC 0xf00dcafe
|
|
|
|
/* Private functions */
|
|
|
|
/**
|
|
* _omap_device_activate - increase device readiness
|
|
* @od: struct omap_device *
|
|
* @ignore_lat: increase to latency target (0) or full readiness (1)?
|
|
*
|
|
* Increase readiness of omap_device @od (thus decreasing device
|
|
* wakeup latency, but consuming more power). If @ignore_lat is
|
|
* IGNORE_WAKEUP_LAT, make the omap_device fully active. Otherwise,
|
|
* if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup
|
|
* latency is greater than the requested maximum wakeup latency, step
|
|
* backwards in the omap_device_pm_latency table to ensure the
|
|
* device's maximum wakeup latency is less than or equal to the
|
|
* requested maximum wakeup latency. Returns 0.
|
|
*/
|
|
static int _omap_device_activate(struct omap_device *od, u8 ignore_lat)
|
|
{
|
|
struct timespec a, b, c;
|
|
|
|
pr_debug("omap_device: %s: activating\n", od->pdev.name);
|
|
|
|
while (od->pm_lat_level > 0) {
|
|
struct omap_device_pm_latency *odpl;
|
|
unsigned long long act_lat = 0;
|
|
|
|
od->pm_lat_level--;
|
|
|
|
odpl = od->pm_lats + od->pm_lat_level;
|
|
|
|
if (!ignore_lat &&
|
|
(od->dev_wakeup_lat <= od->_dev_wakeup_lat_limit))
|
|
break;
|
|
|
|
read_persistent_clock(&a);
|
|
|
|
/* XXX check return code */
|
|
odpl->activate_func(od);
|
|
|
|
read_persistent_clock(&b);
|
|
|
|
c = timespec_sub(b, a);
|
|
act_lat = timespec_to_ns(&c);
|
|
|
|
pr_debug("omap_device: %s: pm_lat %d: activate: elapsed time "
|
|
"%llu nsec\n", od->pdev.name, od->pm_lat_level,
|
|
act_lat);
|
|
|
|
if (act_lat > odpl->activate_lat) {
|
|
odpl->activate_lat_worst = act_lat;
|
|
if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
|
|
odpl->activate_lat = act_lat;
|
|
pr_warning("omap_device: %s.%d: new worst case "
|
|
"activate latency %d: %llu\n",
|
|
od->pdev.name, od->pdev.id,
|
|
od->pm_lat_level, act_lat);
|
|
} else
|
|
pr_warning("omap_device: %s.%d: activate "
|
|
"latency %d higher than exptected. "
|
|
"(%llu > %d)\n",
|
|
od->pdev.name, od->pdev.id,
|
|
od->pm_lat_level, act_lat,
|
|
odpl->activate_lat);
|
|
}
|
|
|
|
od->dev_wakeup_lat -= odpl->activate_lat;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* _omap_device_deactivate - decrease device readiness
|
|
* @od: struct omap_device *
|
|
* @ignore_lat: decrease to latency target (0) or full inactivity (1)?
|
|
*
|
|
* Decrease readiness of omap_device @od (thus increasing device
|
|
* wakeup latency, but conserving power). If @ignore_lat is
|
|
* IGNORE_WAKEUP_LAT, make the omap_device fully inactive. Otherwise,
|
|
* if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup
|
|
* latency is less than the requested maximum wakeup latency, step
|
|
* forwards in the omap_device_pm_latency table to ensure the device's
|
|
* maximum wakeup latency is less than or equal to the requested
|
|
* maximum wakeup latency. Returns 0.
|
|
*/
|
|
static int _omap_device_deactivate(struct omap_device *od, u8 ignore_lat)
|
|
{
|
|
struct timespec a, b, c;
|
|
|
|
pr_debug("omap_device: %s: deactivating\n", od->pdev.name);
|
|
|
|
while (od->pm_lat_level < od->pm_lats_cnt) {
|
|
struct omap_device_pm_latency *odpl;
|
|
unsigned long long deact_lat = 0;
|
|
|
|
odpl = od->pm_lats + od->pm_lat_level;
|
|
|
|
if (!ignore_lat &&
|
|
((od->dev_wakeup_lat + odpl->activate_lat) >
|
|
od->_dev_wakeup_lat_limit))
|
|
break;
|
|
|
|
read_persistent_clock(&a);
|
|
|
|
/* XXX check return code */
|
|
odpl->deactivate_func(od);
|
|
|
|
read_persistent_clock(&b);
|
|
|
|
c = timespec_sub(b, a);
|
|
deact_lat = timespec_to_ns(&c);
|
|
|
|
pr_debug("omap_device: %s: pm_lat %d: deactivate: elapsed time "
|
|
"%llu nsec\n", od->pdev.name, od->pm_lat_level,
|
|
deact_lat);
|
|
|
|
if (deact_lat > odpl->deactivate_lat) {
|
|
odpl->deactivate_lat_worst = deact_lat;
|
|
if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
|
|
odpl->deactivate_lat = deact_lat;
|
|
pr_warning("omap_device: %s.%d: new worst case "
|
|
"deactivate latency %d: %llu\n",
|
|
od->pdev.name, od->pdev.id,
|
|
od->pm_lat_level, deact_lat);
|
|
} else
|
|
pr_warning("omap_device: %s.%d: deactivate "
|
|
"latency %d higher than exptected. "
|
|
"(%llu > %d)\n",
|
|
od->pdev.name, od->pdev.id,
|
|
od->pm_lat_level, deact_lat,
|
|
odpl->deactivate_lat);
|
|
}
|
|
|
|
|
|
od->dev_wakeup_lat += odpl->activate_lat;
|
|
|
|
od->pm_lat_level++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline struct omap_device *_find_by_pdev(struct platform_device *pdev)
|
|
{
|
|
return container_of(pdev, struct omap_device, pdev);
|
|
}
|
|
|
|
|
|
/* Public functions for use by core code */
|
|
|
|
/**
|
|
* omap_device_count_resources - count number of struct resource entries needed
|
|
* @od: struct omap_device *
|
|
*
|
|
* Count the number of struct resource entries needed for this
|
|
* omap_device @od. Used by omap_device_build_ss() to determine how
|
|
* much memory to allocate before calling
|
|
* omap_device_fill_resources(). Returns the count.
|
|
*/
|
|
int omap_device_count_resources(struct omap_device *od)
|
|
{
|
|
struct omap_hwmod *oh;
|
|
int c = 0;
|
|
int i;
|
|
|
|
for (i = 0, oh = *od->hwmods; i < od->hwmods_cnt; i++, oh++)
|
|
c += omap_hwmod_count_resources(oh);
|
|
|
|
pr_debug("omap_device: %s: counted %d total resources across %d "
|
|
"hwmods\n", od->pdev.name, c, od->hwmods_cnt);
|
|
|
|
return c;
|
|
}
|
|
|
|
/**
|
|
* omap_device_fill_resources - fill in array of struct resource
|
|
* @od: struct omap_device *
|
|
* @res: pointer to an array of struct resource to be filled in
|
|
*
|
|
* Populate one or more empty struct resource pointed to by @res with
|
|
* the resource data for this omap_device @od. Used by
|
|
* 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
|
|
* get_resource()/ get_irq()/etc functions that use the underlying
|
|
* omap_hwmod information. Or if platform_device is extended to use
|
|
* subarchitecture-specific function pointers, the various
|
|
* 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
|
|
* @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 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, 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 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 is_early_device)
|
|
{
|
|
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;
|
|
|
|
od->magic = OMAP_DEVICE_MAGIC;
|
|
|
|
if (is_early_device)
|
|
ret = omap_early_device_register(od);
|
|
else
|
|
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_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.
|
|
*/
|
|
int omap_early_device_register(struct omap_device *od)
|
|
{
|
|
struct platform_device *devices[1];
|
|
|
|
devices[0] = &(od->pdev);
|
|
early_platform_add_devices(devices, 1);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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: %s() called from invalid state %d\n",
|
|
od->pdev.name, od->pdev.id, __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 = _find_by_pdev(pdev);
|
|
|
|
if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
|
|
WARN(1, "omap_device: %s.%d: %s() called from invalid state %d\n",
|
|
od->pdev.name, od->pdev.id, __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;
|
|
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: %s() called from invalid state %d\n",
|
|
od->pdev.name, od->pdev.id, __func__, od->_state);
|
|
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_is_valid - Check if pointer is a valid omap_device
|
|
* @od: struct omap_device *
|
|
*
|
|
* Return whether struct omap_device pointer @od points to a valid
|
|
* omap_device.
|
|
*/
|
|
bool omap_device_is_valid(struct omap_device *od)
|
|
{
|
|
return (od && od->magic == OMAP_DEVICE_MAGIC);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|