emif_plat.h
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/*
* Definitions for TI EMIF device platform data
*
* Copyright (C) 2012 Texas Instruments, Inc.
*
* Aneesh V <aneesh@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_PLAT_H
#define __EMIF_PLAT_H
/* Low power modes - EMIF_PWR_MGMT_CTRL */
#define EMIF_LP_MODE_DISABLE 0
#define EMIF_LP_MODE_CLOCK_STOP 1
#define EMIF_LP_MODE_SELF_REFRESH 2
#define EMIF_LP_MODE_PWR_DN 4
/* Hardware capabilities */
#define EMIF_HW_CAPS_LL_INTERFACE 0x00000001
/*
* EMIF IP Revisions
* EMIF4D - Used in OMAP4
* EMIF4D5 - Used in OMAP5
*/
#define EMIF_4D 1
#define EMIF_4D5 2
/*
* PHY types
* ATTILAPHY - Used in OMAP4
* INTELLIPHY - Used in OMAP5
*/
#define EMIF_PHY_TYPE_ATTILAPHY 1
#define EMIF_PHY_TYPE_INTELLIPHY 2
/* Custom config requests */
#define EMIF_CUSTOM_CONFIG_LPMODE 0x00000001
#define EMIF_CUSTOM_CONFIG_TEMP_ALERT_POLL_INTERVAL 0x00000002
#define EMIF_CUSTOM_CONFIG_EXTENDED_TEMP_PART 0x00000004
#ifndef __ASSEMBLY__
/**
* struct ddr_device_info - All information about the DDR device except AC
* timing parameters
* @type: Device type (LPDDR2-S4, LPDDR2-S2 etc)
* @density: Device density
* @io_width: Bus width
* @cs1_used: Whether there is a DDR device attached to the second
* chip-select(CS1) of this EMIF instance
* @cal_resistors_per_cs: Whether there is one calibration resistor per
* chip-select or whether it's a single one for both
* @manufacturer: Manufacturer name string
*/
struct ddr_device_info {
u32 type;
u32 density;
u32 io_width;
u32 cs1_used;
u32 cal_resistors_per_cs;
char manufacturer[10];
};
/**
* struct emif_custom_configs - Custom configuration parameters/policies
* passed from the platform layer
* @mask: Mask to indicate which configs are requested
* @lpmode: LPMODE to be used in PWR_MGMT_CTRL register
* @lpmode_timeout_performance: Timeout before LPMODE entry when higher
* performance is desired at the cost of power (typically
* at higher OPPs)
* @lpmode_timeout_power: Timeout before LPMODE entry when better power
* savings is desired and performance is not important
* (typically at lower loads indicated by lower OPPs)
* @lpmode_freq_threshold: The DDR frequency threshold to identify between
* the above two cases:
* timeout = (freq >= lpmode_freq_threshold) ?
* lpmode_timeout_performance :
* lpmode_timeout_power;
* @temp_alert_poll_interval_ms: LPDDR2 MR4 polling interval at nominal
* temperature(in milliseconds). When temperature is high
* polling is done 4 times as frequently.
*/
struct emif_custom_configs {
u32 mask;
u32 lpmode;
u32 lpmode_timeout_performance;
u32 lpmode_timeout_power;
u32 lpmode_freq_threshold;
u32 temp_alert_poll_interval_ms;
};
/**
* struct emif_platform_data - Platform data passed on EMIF platform
* device creation. Used by the driver.
* @hw_caps: Hw capabilities of the EMIF IP in the respective SoC
* @device_info: Device info structure containing information such
* as type, bus width, density etc
* @timings: Timings information from device datasheet passed
* as an array of 'struct lpddr2_timings'. Can be NULL
* if if default timings are ok
* @timings_arr_size: Size of the timings array. Depends on the number
* of different frequencies for which timings data
* is provided
* @min_tck: Minimum value of some timing parameters in terms
* of number of cycles. Can be NULL if default values
* are ok
* @custom_configs: Custom configurations requested by SoC or board
* code and the data for them. Can be NULL if default
* configurations done by the driver are ok. See
* documentation for 'struct emif_custom_configs' for
* more details
*/
struct emif_platform_data {
u32 hw_caps;
struct ddr_device_info *device_info;
const struct lpddr2_timings *timings;
u32 timings_arr_size;
const struct lpddr2_min_tck *min_tck;
struct emif_custom_configs *custom_configs;
u32 ip_rev;
u32 phy_type;
};
#endif /* __ASSEMBLY__ */
#endif /* __LINUX_EMIF_H */