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/*
* Copyright (C) 2007 Google, Inc.
* Copyright (c) 2007-2011, 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 <mach/clk.h>
#include <mach/clk-provider.h>
#include <mach/socinfo.h>
#include <mach/proc_comm.h>
#include "clock.h"
#include "clock-pcom.h"
/*
* glue for the proc_comm interface
*/
static int pc_clk_enable(struct clk *clk)
{
int rc;
int id = to_pcom_clk(clk)->id;
/* Ignore clocks that are always on */
if (id == P_EBI1_CLK || id == P_EBI1_FIXED_CLK)
return 0;
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 *clk)
{
int id = to_pcom_clk(clk)->id;
/* Ignore clocks that are always on */
if (id == P_EBI1_CLK || id == P_EBI1_FIXED_CLK)
return;
msm_proc_comm(PCOM_CLKCTL_RPC_DISABLE, &id, NULL);
}
int pc_clk_reset(unsigned id, enum clk_reset_action action)
{
int rc;
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_reset(struct clk *clk, enum clk_reset_action action)
{
int id = to_pcom_clk(clk)->id;
return pc_clk_reset(id, action);
}
static int _pc_clk_set_rate(struct clk *clk, unsigned long rate)
{
/* 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.
*/
unsigned r = rate;
int id = to_pcom_clk(clk)->id;
int rc = msm_proc_comm(PCOM_CLKCTL_RPC_SET_RATE, &id, &r);
if (rc < 0)
return rc;
else
return (int)id < 0 ? -EINVAL : 0;
}
static int _pc_clk_set_min_rate(struct clk *clk, unsigned long rate)
{
int rc;
int id = to_pcom_clk(clk)->id;
bool ignore_error = (cpu_is_msm7x27() && id == P_EBI1_CLK &&
rate >= INT_MAX);
unsigned r = rate;
rc = msm_proc_comm(PCOM_CLKCTL_RPC_MIN_RATE, &id, &r);
if (rc < 0)
return rc;
else if (ignore_error)
return 0;
else
return (int)id < 0 ? -EINVAL : 0;
}
static int pc_clk_set_rate(struct clk *clk, unsigned long rate)
{
if (clk->flags & CLKFLAG_MIN)
return _pc_clk_set_min_rate(clk, rate);
else
return _pc_clk_set_rate(clk, rate);
}
static int pc_clk_set_max_rate(struct clk *clk, unsigned long rate)
{
int id = to_pcom_clk(clk)->id;
unsigned r = rate;
int rc = msm_proc_comm(PCOM_CLKCTL_RPC_MAX_RATE, &id, &r);
if (rc < 0)
return rc;
else
return (int)id < 0 ? -EINVAL : 0;
}
static int pc_clk_set_flags(struct clk *clk, unsigned flags)
{
int id = to_pcom_clk(clk)->id;
int rc = msm_proc_comm(PCOM_CLKCTL_RPC_SET_FLAGS, &id, &flags);
if (rc < 0)
return rc;
else
return (int)id < 0 ? -EINVAL : 0;
}
static int pc_clk_set_ext_config(struct clk *clk, unsigned long config)
{
int id = to_pcom_clk(clk)->id;
unsigned c = config;
int rc = msm_proc_comm(PCOM_CLKCTL_RPC_SET_EXT_CONFIG, &id, &c);
if (rc < 0)
return rc;
else
return (int)id < 0 ? -EINVAL : 0;
}
static unsigned long pc_clk_get_rate(struct clk *clk)
{
int id = to_pcom_clk(clk)->id;
if (msm_proc_comm(PCOM_CLKCTL_RPC_RATE, &id, NULL))
return 0;
else
return id;
}
static int pc_clk_is_enabled(struct clk *clk)
{
int id = to_pcom_clk(clk)->id;
if (msm_proc_comm(PCOM_CLKCTL_RPC_ENABLED, &id, NULL))
return 0;
else
return id;
}
static long pc_clk_round_rate(struct clk *clk, unsigned long rate)
{
/* Not really supported; pc_clk_set_rate() does rounding on it's own. */
return rate;
}
static bool pc_clk_is_local(struct clk *clk)
{
return false;
}
static enum handoff pc_clk_handoff(struct clk *clk)
{
/*
* Handoff clock state only since querying and caching the rate here
* would incur more overhead than it would ever save.
*/
if (pc_clk_is_enabled(clk))
return HANDOFF_ENABLED_CLK;
return HANDOFF_DISABLED_CLK;
}
struct clk_ops clk_ops_pcom = {
.enable = pc_clk_enable,
.disable = pc_clk_disable,
.reset = pc_reset,
.set_rate = pc_clk_set_rate,
.set_max_rate = pc_clk_set_max_rate,
.set_flags = pc_clk_set_flags,
.get_rate = pc_clk_get_rate,
.is_enabled = pc_clk_is_enabled,
.round_rate = pc_clk_round_rate,
.is_local = pc_clk_is_local,
.handoff = pc_clk_handoff,
};
struct clk_ops clk_ops_pcom_ext_config = {
.enable = pc_clk_enable,
.disable = pc_clk_disable,
.reset = pc_reset,
.set_rate = pc_clk_set_ext_config,
.set_max_rate = pc_clk_set_max_rate,
.set_flags = pc_clk_set_flags,
.get_rate = pc_clk_get_rate,
.is_enabled = pc_clk_is_enabled,
.round_rate = pc_clk_round_rate,
.is_local = pc_clk_is_local,
.handoff = pc_clk_handoff,
};
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