clock-pcom.c
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/*
* Copyright (C) 2007 Google, Inc.
* Copyright (c) 2007-2012, The Linux Foundation. All rights reserved.
*
* 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.
*
* 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.
*
*/
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <mach/clk.h>
#include "proc_comm.h"
#include "clock.h"
#include "clock-pcom.h"
struct clk_pcom {
unsigned id;
unsigned long flags;
struct msm_clk msm_clk;
};
static inline struct clk_pcom *to_clk_pcom(struct clk_hw *hw)
{
return container_of(to_msm_clk(hw), struct clk_pcom, msm_clk);
}
static int pc_clk_enable(struct clk_hw *hw)
{
unsigned id = to_clk_pcom(hw)->id;
int rc = msm_proc_comm(PCOM_CLKCTL_RPC_ENABLE, &id, NULL);
if (rc < 0)
return rc;
else
return (int)id < 0 ? -EINVAL : 0;
}
static void pc_clk_disable(struct clk_hw *hw)
{
unsigned id = to_clk_pcom(hw)->id;
msm_proc_comm(PCOM_CLKCTL_RPC_DISABLE, &id, NULL);
}
static int pc_clk_reset(struct clk_hw *hw, enum clk_reset_action action)
{
int rc;
unsigned id = to_clk_pcom(hw)->id;
if (action == CLK_RESET_ASSERT)
rc = msm_proc_comm(PCOM_CLKCTL_RPC_RESET_ASSERT, &id, NULL);
else
rc = msm_proc_comm(PCOM_CLKCTL_RPC_RESET_DEASSERT, &id, NULL);
if (rc < 0)
return rc;
else
return (int)id < 0 ? -EINVAL : 0;
}
static int pc_clk_set_rate(struct clk_hw *hw, unsigned long new_rate,
unsigned long p_rate)
{
struct clk_pcom *p = to_clk_pcom(hw);
unsigned id = p->id, rate = new_rate;
int rc;
/*
* The rate _might_ be rounded off to the nearest KHz value by the
* remote function. So a return value of 0 doesn't necessarily mean
* that the exact rate was set successfully.
*/
if (p->flags & CLKFLAG_MIN)
rc = msm_proc_comm(PCOM_CLKCTL_RPC_MIN_RATE, &id, &rate);
else
rc = msm_proc_comm(PCOM_CLKCTL_RPC_SET_RATE, &id, &rate);
if (rc < 0)
return rc;
else
return (int)id < 0 ? -EINVAL : 0;
}
static unsigned long pc_clk_recalc_rate(struct clk_hw *hw, unsigned long p_rate)
{
unsigned id = to_clk_pcom(hw)->id;
if (msm_proc_comm(PCOM_CLKCTL_RPC_RATE, &id, NULL))
return 0;
else
return id;
}
static int pc_clk_is_enabled(struct clk_hw *hw)
{
unsigned id = to_clk_pcom(hw)->id;
if (msm_proc_comm(PCOM_CLKCTL_RPC_ENABLED, &id, NULL))
return 0;
else
return id;
}
static long pc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *p_rate)
{
/* Not really supported; pc_clk_set_rate() does rounding on it's own. */
return rate;
}
static struct clk_ops clk_ops_pcom = {
.enable = pc_clk_enable,
.disable = pc_clk_disable,
.set_rate = pc_clk_set_rate,
.recalc_rate = pc_clk_recalc_rate,
.is_enabled = pc_clk_is_enabled,
.round_rate = pc_clk_round_rate,
};
static int msm_clock_pcom_probe(struct platform_device *pdev)
{
const struct pcom_clk_pdata *pdata = pdev->dev.platform_data;
int i, ret;
for (i = 0; i < pdata->num_lookups; i++) {
const struct clk_pcom_desc *desc = &pdata->lookup[i];
struct clk *c;
struct clk_pcom *p;
struct clk_hw *hw;
struct clk_init_data init;
p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
if (!p)
return -ENOMEM;
p->id = desc->id;
p->flags = desc->flags;
p->msm_clk.reset = pc_clk_reset;
hw = &p->msm_clk.hw;
hw->init = &init;
init.name = desc->name;
init.ops = &clk_ops_pcom;
init.num_parents = 0;
init.flags = CLK_IS_ROOT;
if (!(p->flags & CLKFLAG_AUTO_OFF))
init.flags |= CLK_IGNORE_UNUSED;
c = devm_clk_register(&pdev->dev, hw);
ret = clk_register_clkdev(c, desc->con, desc->dev);
if (ret)
return ret;
}
return 0;
}
static struct platform_driver msm_clock_pcom_driver = {
.probe = msm_clock_pcom_probe,
.driver = {
.name = "msm-clock-pcom",
.owner = THIS_MODULE,
},
};
module_platform_driver(msm_clock_pcom_driver);
MODULE_LICENSE("GPL v2");