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dptc.h

/*
 * Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved.
 */

/*
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#ifndef __ASM_ARCH_MXC_DPTC_H__
#define __ASM_ARCH_MXC_DPTC_H__

#include <mach/dvfs_dptc_struct.h>

/*!
 * DPTC proc file system entry name
 */
#define PROC_NODE_NAME  "dptc"

int __init init_dptc_controller(dvfs_dptc_params_s * params);

/*!
 * This function enables the DPTC module. this function updates the DPTC
 * thresholds, updates the PMIC, unmasks the DPTC interrupt and enables
 * the DPTC module
 *
 * @param    params    pointer to the DVFS & DPTC driver parameters structure.
 *
 * @return      0 if DPTC module was enabled else returns -EINVAL.
 */
int start_dptc(dvfs_dptc_params_s * params);
/*!
 * This function disables the DPTC module.
 *
 * @param    params    pointer to the DVFS & DPTC driver parameters structure.
 *
 * @return      0 if DPTC module was disabled else returns -EINVAL.
 */
int stop_dptc(dvfs_dptc_params_s * params);
/*!
 * This function updates the drivers current working point index. This index is
 * used for access the current DTPC table entry and it corresponds to the
 * current CPU working point measured by the DPTC hardware.
 *
 * @param    params    pointer to the DVFS & DPTC driver parameters structure.
 * @param    new_wp     New working point index value to be set.
 *
 */
void set_dptc_wp(dvfs_dptc_params_s * params, int new_wp);
/*!
 * This function updates the DPTC threshold registers.
 *
 * @param    dvfs_dptc_tables_ptr    pointer to the DPTC translation table.
 * @param    wp               current wp value.
 * @param    freq_index       translation table index of the current CPU
 *                      frequency.
 *
 */
void update_dptc_thresholds(dvfs_dptc_tables_s * dptc_tables_ptr,
                      int wp, int freq_index);
/*!
 * This function adds a new entry to the DPTC log buffer.
 *
 * @param    params    pointer to the DVFS & DPTC driver parameters structure.
 * @param    dptc_log         pointer to the DPTC log buffer structure.
 * @param    wp               value of the working point index written
 *                      to the log buffer.
 * @param    freq_index       value of the frequency index written to
 *                      the log buffer.
 *
 * @return   number of log buffer entries.
 *
 */

void add_dptc_log_entry(dvfs_dptc_params_s * params,
                  dptc_log_s * dptc_log, int wp, int freq_index);

/*!
 * This function updates the CPU voltage, produced by PMIC, by calling PMIC
 * driver functions.
 *
 * @param    dptc_tables_ptr    pointer to the DPTC translation table.
 * @param    wp               current wp value.
 */
void set_pmic_voltage(dvfs_dptc_tables_s * dptc_tables_ptr, int wp);

/*!
 * This function enables the DPTC reference circuits.
 *
 * @param    params    pointer to the DVFS & DPTC driver parameters structure.
 * @param    rc_state  each high bit specifies which
 *                     reference circuite to enable.
 * @return   0 on success, error code on failure
 */
int enable_ref_circuits(dvfs_dptc_params_s * params, unsigned char rc_state);

/*!
 * This function disables the DPTC reference circuits.
  *
 * @param    params    pointer to the DVFS & DPTC driver parameters structure.
 * @param    rc_state  each high bit specifies which
 *                     reference circuite to disable
 * @return   0 on success, error code on failure
 */
int disable_ref_circuits(dvfs_dptc_params_s * params, unsigned char rc_state);

/*!
 * This function is the DPTC Interrupt handler.
 * This function wakes-up the dptc_workqueue_handler function that handles the
 * DPTC interrupt.
 */
void dptc_irq(void);

/*!
 * This function updates the drivers current frequency index.This index is
 * used for access the current DTPC table entry and it corresponds to the
 * current CPU frequency (each CPU frequency has a separate index number
 * according to the loaded DPTC table).
 *
 * @param    params      pointer to the DVFS & DPTC driver parameters structure.
 * @param    freq_index  New frequency index value to be set.
 *
 * @return      0 if the frequency index was updated (the new index is a
 *          valid index and the DPTC module isn't active) else returns
 *              -EINVAL.
 *
 */
int set_dptc_curr_freq(dvfs_dptc_params_s * params, unsigned int freq_index);

#ifdef CONFIG_MXC_DVFS_SDMA
/*
 * DPTC SDMA callback.
 * Updates the PMIC voltage
 *
 * @param    params       pointer to the DVFS & DPTC driver parameters structure.
 */
void dptc_sdma_callback(dvfs_dptc_params_s * params);
#endif

/*!
 * This function is called to put the DPTC in a low power state.
 *
 * @param   pdev  the device structure used to give information on which
 *                device to suspend (not relevant for DPTC)
 * @param   state the power state the device is entering
 *
 * @return  The function always returns 0.
 */
int mxc_dptc_suspend(struct platform_device *pdev, pm_message_t state);

/*!
 * This function is called to put the DPTC in a low power state.
 *
 */
void dptc_suspend(void);

/*!
 * This function is called to resume the DPTC from a low power state.
 *
 * @param   pdev  the device structure used to give information on which
 *                device to suspend (not relevant for DPTC)
 *
 * @return  The function always returns 0.
 */
int mxc_dptc_resume(struct platform_device *dev);

/*!
 * This function is called to resume the DPTC from a low power state.
 *
 */
void dptc_resume(void);

/*!
 * This function initializes DPTC according to turbo mode status
 *
 * @param    status    Turbo mode disable, 1 - turbo mode enabled
 *
 */
void dptc_set_turbo_mode(unsigned int status);

#endif                        /* __ASM_ARCH_MXC_DPTC_H__ */

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