clock-pcom.c

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/*
 * Copyright (C) 2007 Google, Inc.
 * Copyright (c) 2007-2010, Code Aurora Forum. 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/err.h>
#include <linux/ctype.h>
#include <linux/stddef.h>
#include <mach/clk.h>

#include "proc_comm.h"
#include "clock.h"
#include "clock-pcom.h"

/*
 * glue for the proc_comm interface
 */
static int pc_clk_enable(unsigned 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(unsigned id)
{
    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_clk_set_rate(unsigned id, unsigned 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.
     */
    int rc = msm_proc_comm(PCOM_CLKCTL_RPC_SET_RATE, &id, &rate);
    if (rc < 0)
        return rc;
    else
        return (int)id < 0 ? -EINVAL : 0;
}

static int pc_clk_set_min_rate(unsigned id, unsigned rate)
{
    int rc = msm_proc_comm(PCOM_CLKCTL_RPC_MIN_RATE, &id, &rate);
    if (rc < 0)
        return rc;
    else
        return (int)id < 0 ? -EINVAL : 0;
}

static int pc_clk_set_max_rate(unsigned id, unsigned rate)
{
    int rc = msm_proc_comm(PCOM_CLKCTL_RPC_MAX_RATE, &id, &rate);
    if (rc < 0)
        return rc;
    else
        return (int)id < 0 ? -EINVAL : 0;
}

static int pc_clk_set_flags(unsigned id, unsigned flags)
{
    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 unsigned pc_clk_get_rate(unsigned id)
{
    if (msm_proc_comm(PCOM_CLKCTL_RPC_RATE, &id, NULL))
        return 0;
    else
        return id;
}

static unsigned pc_clk_is_enabled(unsigned id)
{
    if (msm_proc_comm(PCOM_CLKCTL_RPC_ENABLED, &id, NULL))
        return 0;
    else
        return id;
}

static long pc_clk_round_rate(unsigned id, unsigned rate)
{

    /* Not really supported; pc_clk_set_rate() does rounding on it's own. */
    return rate;
}

static bool pc_clk_is_local(unsigned id)
{
    return false;
}

struct clk_ops clk_ops_pcom = {
    .enable = pc_clk_enable,
    .disable = pc_clk_disable,
    .auto_off = pc_clk_disable,
    .reset = pc_clk_reset,
    .set_rate = pc_clk_set_rate,
    .set_min_rate = pc_clk_set_min_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,
};