linux-imx

/*

 * Defines for the EMIF driver

 *

 * Copyright (C) 2012 Texas Instruments, Inc.

 *

 * Benoit Cousson (b-cousson@ti.com)

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

#ifndef __EMIF_H

#define __EMIF_H

​

/*

 * Maximum number of different frequencies supported by EMIF driver

 * Determines the number of entries in the pointer array for register

 * cache

 */

#define EMIF_MAX_NUM_FREQUENCIES            6

​

/* State of the core voltage */

#define DDR_VOLTAGE_STABLE              0

#define DDR_VOLTAGE_RAMPING             1

​

/* Defines for timing De-rating */

#define EMIF_NORMAL_TIMINGS             0

#define EMIF_DERATED_TIMINGS                1

​

/* Length of the forced read idle period in terms of cycles */

#define EMIF_READ_IDLE_LEN_VAL              5

​

/*

 * forced read idle interval to be used when voltage

 * is changed as part of DVFS/DPS - 1ms

 */

#define READ_IDLE_INTERVAL_DVFS             (1*1000000)

​

/*

 * Forced read idle interval to be used when voltage is stable

 * 50us - or maximum value will do

 */

#define READ_IDLE_INTERVAL_NORMAL           (50*1000000)

​

/* DLL calibration interval when voltage is NOT stable - 1us */

#define DLL_CALIB_INTERVAL_DVFS             (1*1000000)

​

#define DLL_CALIB_ACK_WAIT_VAL              5

​

/* Interval between ZQCS commands - hw team recommended value */

#define EMIF_ZQCS_INTERVAL_US               (50*1000)

/* Enable ZQ Calibration on exiting Self-refresh */

#define ZQ_SFEXITEN_ENABLE              1

/*

 * ZQ Calibration simultaneously on both chip-selects:

 * Needs one calibration resistor per CS

 */

#define ZQ_DUALCALEN_DISABLE                0

#define ZQ_DUALCALEN_ENABLE             1

​

#define T_ZQCS_DEFAULT_NS               90

#define T_ZQCL_DEFAULT_NS               360

#define T_ZQINIT_DEFAULT_NS             1000