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/*
* drivers/video/tegra/host/t30/acm_t30.c
*
* Tegra Graphics Host Power Management for Tegra3
*
* Copyright (c) 2010-2011, NVIDIA Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/slab.h>
#include <linux/err.h>
#include "../dev.h"
#include "../chip_support.h"
#include "../nvhost_acm.h"
#include "t30.h"
DEFINE_MUTEX(client_list_lock);
struct nvhost_module_client {
struct list_head node;
unsigned long rate[NVHOST_MODULE_MAX_CLOCKS];
void *priv;
};
int t30_acm_get_rate(struct nvhost_module *mod, unsigned long *rate,
int index)
{
struct clk *c;
c = mod->clk[index];
if (IS_ERR_OR_NULL(c))
return -EINVAL;
/* Need to enable client to get correct rate */
nvhost_module_busy(mod);
*rate = clk_get_rate(c);
nvhost_module_idle(mod);
return 0;
}
static int t30_acm_update_rate(struct nvhost_module *mod, int index)
{
unsigned long rate = 0;
struct nvhost_module_client *m;
if (!mod->clk[index])
return -EINVAL;
list_for_each_entry(m, &mod->client_list, node) {
rate = max(m->rate[index], rate);
}
if (!rate)
rate = clk_round_rate(mod->clk[index],
mod->desc->clocks[index].default_rate);
return clk_set_rate(mod->clk[index], rate);
}
int t30_acm_set_rate(struct nvhost_module *mod, void *priv,
unsigned long rate, int index)
{
struct nvhost_module_client *m;
int ret;
mutex_lock(&client_list_lock);
list_for_each_entry(m, &mod->client_list, node) {
if (m->priv == priv) {
rate = clk_round_rate(mod->clk[index], rate);
m->rate[index] = rate;
break;
}
}
ret = t30_acm_update_rate(mod, index);
mutex_unlock(&client_list_lock);
return ret;
}
int t30_acm_add_client(struct nvhost_module *mod, void *priv)
{
int i;
unsigned long rate;
struct nvhost_module_client *client;
client = kzalloc(sizeof(*client), GFP_KERNEL);
if (!client)
return -ENOMEM;
INIT_LIST_HEAD(&client->node);
client->priv = priv;
for (i = 0; i < mod->num_clks; i++) {
rate = clk_round_rate(mod->clk[i],
mod->desc->clocks[i].default_rate);
client->rate[i] = rate;
}
mutex_lock(&client_list_lock);
list_add_tail(&client->node, &mod->client_list);
mutex_unlock(&client_list_lock);
return 0;
}
void t30_acm_remove_client(struct nvhost_module *mod, void *priv)
{
int i;
struct nvhost_module_client *m;
mutex_lock(&client_list_lock);
list_for_each_entry(m, &mod->client_list, node) {
if (priv == m->priv) {
list_del(&m->node);
break;
}
}
m->priv = NULL;
kfree(m);
for (i = 0; i < mod->num_clks; i++)
t30_acm_update_rate(mod, i);
mutex_unlock(&client_list_lock);
}
int nvhost_init_t30_acm(struct nvhost_master *host)
{
host->op.acm.get_rate = t30_acm_get_rate;
host->op.acm.set_rate = t30_acm_set_rate;
host->op.acm.add_client = t30_acm_add_client;
host->op.acm.remove_client = t30_acm_remove_client;
return 0;
}
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