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/*
* Remote processor resources
*
* Copyright (C) 2011 Texas Instruments, Inc.
* Copyright (C) 2011 Google, Inc.
*
* Fernando Guzman Lugo <fernando.lugo@ti.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <plat/omap_device.h>
#include <plat/rpres.h>
static LIST_HEAD(rpres_list);
static DEFINE_SPINLOCK(rpres_lock);
static struct rpres *__find_by_name(const char *name)
{
struct rpres *obj;
list_for_each_entry(obj, &rpres_list, next)
if (!strcmp(obj->name, name))
return obj;
return NULL;
}
struct rpres *rpres_get(const char *name)
{
int ret;
struct rpres *r;
struct rpres_platform_data *pdata;
spin_lock(&rpres_lock);
r = __find_by_name(name);
spin_unlock(&rpres_lock);
if (!r)
return ERR_PTR(-ENOENT);
mutex_lock(&r->lock);
if (r->state == RPRES_ACTIVE) {
pr_err("%s:resource already active\n", __func__);
ret = -EINVAL;
goto out;
}
pdata = r->pdev->dev.platform_data;
ret = pdata->ops->start(r->pdev);
if (!ret)
r->state = RPRES_ACTIVE;
out:
mutex_unlock(&r->lock);
if (ret)
return ERR_PTR(ret);
return r;
}
EXPORT_SYMBOL(rpres_get);
void rpres_put(struct rpres *obj)
{
struct rpres_platform_data *pdata = obj->pdev->dev.platform_data;
mutex_lock(&obj->lock);
if (obj->state == RPRES_INACTIVE) {
pr_err("%s:resource already inactive\n", __func__);
} else {
pdata->ops->stop(obj->pdev);
obj->state = RPRES_INACTIVE;
}
mutex_unlock(&obj->lock);
}
EXPORT_SYMBOL(rpres_put);
int rpres_set_constraints(struct rpres *obj, enum rpres_constraint type, long val)
{
int ret;
struct rpres_platform_data *pdata = obj->pdev->dev.platform_data;
struct platform_device *pdev = obj->pdev;
static const char *cname[] = {"scale", "latency", "bandwidth"};
int (*func)(struct platform_device *, long);
switch (type) {
case RPRES_CONSTRAINT_SCALE:
func = pdata->ops->scale_dev;
break;
case RPRES_CONSTRAINT_LATENCY:
func = pdata->ops->set_lat;
break;
case RPRES_CONSTRAINT_BANDWIDTH:
func = pdata->ops->set_bw;
break;
default:
dev_err(&pdev->dev, "%s: invalid constraint %d\n",
__func__, type);
return -EINVAL;
}
if (!func) {
dev_err(&pdev->dev, "%s: No %s constraint\n",
__func__, cname[type]);
return -EINVAL;
}
mutex_lock(&obj->lock);
if (obj->state == RPRES_INACTIVE) {
mutex_unlock(&obj->lock);
pr_err("%s: resource inactive\n", __func__);
return -EPERM;
}
dev_dbg(&pdev->dev, "set %s constraint %ld\n", cname[type], val);
ret = func(pdev, val);
if (ret)
dev_err(&pdev->dev, "%s: error setting constraint %s\n",
__func__, cname[type]);
mutex_unlock(&obj->lock);
return ret;
}
EXPORT_SYMBOL(rpres_set_constraints);
static int rpres_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct rpres_platform_data *pdata = dev->platform_data;
struct rpres *obj;
obj = kzalloc(sizeof(*obj), GFP_KERNEL);
if (!obj)
return -ENOMEM;
obj->pdev = pdev;
obj->name = pdata->name;
obj->state = RPRES_INACTIVE;
mutex_init(&obj->lock);
spin_lock(&rpres_lock);
list_add_tail(&obj->next, &rpres_list);
spin_unlock(&rpres_lock);
return 0;
}
static int __devexit rpres_remove(struct platform_device *pdev)
{
struct rpres_platform_data *pdata = pdev->dev.platform_data;
struct rpres *obj;
spin_lock(&rpres_lock);
obj = __find_by_name(pdata->name);
if (!obj) {
spin_unlock(&rpres_lock);
dev_err(&pdev->dev, "fail to remove %s\n", pdata->name);
return -ENOENT;
}
list_del(&obj->next);
spin_unlock(&rpres_lock);
kfree(obj);
return 0;
}
static struct platform_device_id rpres_id_table[] = {
{
.name = "iva",
},
{
.name = "fdif",
},
{
.name = "rpres",
},
{ },
};
MODULE_DEVICE_TABLE(platform, rpres_id_table);
static struct platform_driver omap_rpres_driver = {
.id_table = rpres_id_table,
.probe = rpres_probe,
.remove = __devexit_p(rpres_remove),
.driver = {
.name = "rpres",
.owner = THIS_MODULE,
},
};
static int __init rpres_init(void)
{
return platform_driver_register(&omap_rpres_driver);
}
late_initcall(rpres_init);
static void __exit rpres_exit(void)
{
platform_driver_unregister(&omap_rpres_driver);
}
module_exit(rpres_exit);
MODULE_LICENSE("GPL v2");
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