mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 23:53:55 +08:00
7ec944538d
EMIF is an SDRAM controller used in various Texas Instruments SoCs. EMIF supports, based on its revision, one or more of LPDDR2/DDR2/DDR3 protocols. Add the basic infrastructure for EMIF driver that includes driver registration, probe, parsing of platform data etc. Signed-off-by: Aneesh V <aneesh@ti.com> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Reviewed-by: Benoit Cousson <b-cousson@ti.com> [santosh.shilimkar@ti.com: Moved to drivers/memory from drivers/misc] Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Tested-by: Lokesh Vutla <lokeshvutla@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
129 lines
4.0 KiB
C
129 lines
4.0 KiB
C
/*
|
|
* 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
|
|
|
|
#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 */
|