memory: emif: add basic infrastructure for EMIF driver
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>
This commit is contained in:
Aneesh V
Greg Kroah-Hartman
Родитель
6c8b0906cf
Коммит
7ec944538d
|
|
@ -0,0 +1,57 @@
|
|||
TI EMIF SDRAM Controller Driver:
|
||||
|
||||
Author
|
||||
========
|
||||
Aneesh V <aneesh@ti.com>
|
||||
|
||||
Location
|
||||
============
|
||||
driver/memory/emif.c
|
||||
|
||||
Supported SoCs:
|
||||
===================
|
||||
TI OMAP44xx
|
||||
TI OMAP54xx
|
||||
|
||||
Menuconfig option:
|
||||
==========================
|
||||
Device Drivers
|
||||
Memory devices
|
||||
Texas Instruments EMIF driver
|
||||
|
||||
Description
|
||||
===========
|
||||
This driver is for the EMIF module available in Texas Instruments
|
||||
SoCs. EMIF is an SDRAM controller that, based on its revision,
|
||||
supports one or more of DDR2, DDR3, and LPDDR2 SDRAM protocols.
|
||||
This driver takes care of only LPDDR2 memories presently. The
|
||||
functions of the driver includes re-configuring AC timing
|
||||
parameters and other settings during frequency, voltage and
|
||||
temperature changes
|
||||
|
||||
Platform Data (see include/linux/platform_data/emif_plat.h):
|
||||
=====================================================================
|
||||
DDR device details and other board dependent and SoC dependent
|
||||
information can be passed through platform data (struct emif_platform_data)
|
||||
- DDR device details: 'struct ddr_device_info'
|
||||
- Device AC timings: 'struct lpddr2_timings' and 'struct lpddr2_min_tck'
|
||||
- Custom configurations: customizable policy options through
|
||||
'struct emif_custom_configs'
|
||||
- IP revision
|
||||
- PHY type
|
||||
|
||||
Interface to the external world:
|
||||
================================
|
||||
EMIF driver registers notifiers for voltage and frequency changes
|
||||
affecting EMIF and takes appropriate actions when these are invoked.
|
||||
- freq_pre_notify_handling()
|
||||
- freq_post_notify_handling()
|
||||
- volt_notify_handling()
|
||||
|
||||
Debugfs
|
||||
========
|
||||
The driver creates two debugfs entries per device.
|
||||
- regcache_dump : dump of register values calculated and saved for all
|
||||
frequencies used so far.
|
||||
- mr4 : last polled value of MR4 register in the LPDDR2 device. MR4
|
||||
indicates the current temperature level of the device.
|
||||
|
|
@ -142,4 +142,6 @@ source "drivers/devfreq/Kconfig"
|
|||
|
||||
source "drivers/extcon/Kconfig"
|
||||
|
||||
source "drivers/memory/Kconfig"
|
||||
|
||||
endmenu
|
||||
|
|
|
|||
|
|
@ -135,3 +135,4 @@ obj-$(CONFIG_HYPERV) += hv/
|
|||
|
||||
obj-$(CONFIG_PM_DEVFREQ) += devfreq/
|
||||
obj-$(CONFIG_EXTCON) += extcon/
|
||||
obj-$(CONFIG_MEMORY) += memory/
|
||||
|
|
|
|||
|
|
@ -0,0 +1,22 @@
|
|||
#
|
||||
# Memory devices
|
||||
#
|
||||
|
||||
menuconfig MEMORY
|
||||
bool "Memory Controller drivers"
|
||||
|
||||
if MEMORY
|
||||
|
||||
config TI_EMIF
|
||||
tristate "Texas Instruments EMIF driver"
|
||||
select DDR
|
||||
help
|
||||
This driver is for the EMIF module available in Texas Instruments
|
||||
SoCs. EMIF is an SDRAM controller that, based on its revision,
|
||||
supports one or more of DDR2, DDR3, and LPDDR2 SDRAM protocols.
|
||||
This driver takes care of only LPDDR2 memories presently. The
|
||||
functions of the driver includes re-configuring AC timing
|
||||
parameters and other settings during frequency, voltage and
|
||||
temperature changes
|
||||
|
||||
endif
|
||||
|
|
@ -0,0 +1,5 @@
|
|||
#
|
||||
# Makefile for memory devices
|
||||
#
|
||||
|
||||
obj-$(CONFIG_TI_EMIF) += emif.o
|
||||
|
|
@ -0,0 +1,289 @@
|
|||
/*
|
||||
* EMIF driver
|
||||
*
|
||||
* Copyright (C) 2012 Texas Instruments, Inc.
|
||||
*
|
||||
* Aneesh V <aneesh@ti.com>
|
||||
* Santosh Shilimkar <santosh.shilimkar@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.
|
||||
*/
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/reboot.h>
|
||||
#include <linux/platform_data/emif_plat.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/device.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/seq_file.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/list.h>
|
||||
#include <memory/jedec_ddr.h>
|
||||
#include "emif.h"
|
||||
|
||||
/**
|
||||
* struct emif_data - Per device static data for driver's use
|
||||
* @duplicate: Whether the DDR devices attached to this EMIF
|
||||
* instance are exactly same as that on EMIF1. In
|
||||
* this case we can save some memory and processing
|
||||
* @temperature_level: Maximum temperature of LPDDR2 devices attached
|
||||
* to this EMIF - read from MR4 register. If there
|
||||
* are two devices attached to this EMIF, this
|
||||
* value is the maximum of the two temperature
|
||||
* levels.
|
||||
* @node: node in the device list
|
||||
* @base: base address of memory-mapped IO registers.
|
||||
* @dev: device pointer.
|
||||
* @plat_data: Pointer to saved platform data.
|
||||
*/
|
||||
struct emif_data {
|
||||
u8 duplicate;
|
||||
u8 temperature_level;
|
||||
struct list_head node;
|
||||
void __iomem *base;
|
||||
struct device *dev;
|
||||
struct emif_platform_data *plat_data;
|
||||
};
|
||||
|
||||
static struct emif_data *emif1;
|
||||
static LIST_HEAD(device_list);
|
||||
|
||||
static void get_default_timings(struct emif_data *emif)
|
||||
{
|
||||
struct emif_platform_data *pd = emif->plat_data;
|
||||
|
||||
pd->timings = lpddr2_jedec_timings;
|
||||
pd->timings_arr_size = ARRAY_SIZE(lpddr2_jedec_timings);
|
||||
|
||||
dev_warn(emif->dev, "%s: using default timings\n", __func__);
|
||||
}
|
||||
|
||||
static int is_dev_data_valid(u32 type, u32 density, u32 io_width, u32 phy_type,
|
||||
u32 ip_rev, struct device *dev)
|
||||
{
|
||||
int valid;
|
||||
|
||||
valid = (type == DDR_TYPE_LPDDR2_S4 ||
|
||||
type == DDR_TYPE_LPDDR2_S2)
|
||||
&& (density >= DDR_DENSITY_64Mb
|
||||
&& density <= DDR_DENSITY_8Gb)
|
||||
&& (io_width >= DDR_IO_WIDTH_8
|
||||
&& io_width <= DDR_IO_WIDTH_32);
|
||||
|
||||
/* Combinations of EMIF and PHY revisions that we support today */
|
||||
switch (ip_rev) {
|
||||
case EMIF_4D:
|
||||
valid = valid && (phy_type == EMIF_PHY_TYPE_ATTILAPHY);
|
||||
break;
|
||||
case EMIF_4D5:
|
||||
valid = valid && (phy_type == EMIF_PHY_TYPE_INTELLIPHY);
|
||||
break;
|
||||
default:
|
||||
valid = 0;
|
||||
}
|
||||
|
||||
if (!valid)
|
||||
dev_err(dev, "%s: invalid DDR details\n", __func__);
|
||||
return valid;
|
||||
}
|
||||
|
||||
static int is_custom_config_valid(struct emif_custom_configs *cust_cfgs,
|
||||
struct device *dev)
|
||||
{
|
||||
int valid = 1;
|
||||
|
||||
if ((cust_cfgs->mask & EMIF_CUSTOM_CONFIG_LPMODE) &&
|
||||
(cust_cfgs->lpmode != EMIF_LP_MODE_DISABLE))
|
||||
valid = cust_cfgs->lpmode_freq_threshold &&
|
||||
cust_cfgs->lpmode_timeout_performance &&
|
||||
cust_cfgs->lpmode_timeout_power;
|
||||
|
||||
if (cust_cfgs->mask & EMIF_CUSTOM_CONFIG_TEMP_ALERT_POLL_INTERVAL)
|
||||
valid = valid && cust_cfgs->temp_alert_poll_interval_ms;
|
||||
|
||||
if (!valid)
|
||||
dev_warn(dev, "%s: invalid custom configs\n", __func__);
|
||||
|
||||
return valid;
|
||||
}
|
||||
|
||||
static struct emif_data *__init_or_module get_device_details(
|
||||
struct platform_device *pdev)
|
||||
{
|
||||
u32 size;
|
||||
struct emif_data *emif = NULL;
|
||||
struct ddr_device_info *dev_info;
|
||||
struct emif_custom_configs *cust_cfgs;
|
||||
struct emif_platform_data *pd;
|
||||
struct device *dev;
|
||||
void *temp;
|
||||
|
||||
pd = pdev->dev.platform_data;
|
||||
dev = &pdev->dev;
|
||||
|
||||
if (!(pd && pd->device_info && is_dev_data_valid(pd->device_info->type,
|
||||
pd->device_info->density, pd->device_info->io_width,
|
||||
pd->phy_type, pd->ip_rev, dev))) {
|
||||
dev_err(dev, "%s: invalid device data\n", __func__);
|
||||
goto error;
|
||||
}
|
||||
|
||||
emif = devm_kzalloc(dev, sizeof(*emif), GFP_KERNEL);
|
||||
temp = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
|
||||
dev_info = devm_kzalloc(dev, sizeof(*dev_info), GFP_KERNEL);
|
||||
|
||||
if (!emif || !pd || !dev_info) {
|
||||
dev_err(dev, "%s:%d: allocation error\n", __func__, __LINE__);
|
||||
goto error;
|
||||
}
|
||||
|
||||
memcpy(temp, pd, sizeof(*pd));
|
||||
pd = temp;
|
||||
memcpy(dev_info, pd->device_info, sizeof(*dev_info));
|
||||
|
||||
pd->device_info = dev_info;
|
||||
emif->plat_data = pd;
|
||||
emif->dev = dev;
|
||||
emif->temperature_level = SDRAM_TEMP_NOMINAL;
|
||||
|
||||
/*
|
||||
* For EMIF instances other than EMIF1 see if the devices connected
|
||||
* are exactly same as on EMIF1(which is typically the case). If so,
|
||||
* mark it as a duplicate of EMIF1 and skip copying timings data.
|
||||
* This will save some memory and some computation later.
|
||||
*/
|
||||
emif->duplicate = emif1 && (memcmp(dev_info,
|
||||
emif1->plat_data->device_info,
|
||||
sizeof(struct ddr_device_info)) == 0);
|
||||
|
||||
if (emif->duplicate) {
|
||||
pd->timings = NULL;
|
||||
pd->min_tck = NULL;
|
||||
goto out;
|
||||
} else if (emif1) {
|
||||
dev_warn(emif->dev, "%s: Non-symmetric DDR geometry\n",
|
||||
__func__);
|
||||
}
|
||||
|
||||
/*
|
||||
* Copy custom configs - ignore allocation error, if any, as
|
||||
* custom_configs is not very critical
|
||||
*/
|
||||
cust_cfgs = pd->custom_configs;
|
||||
if (cust_cfgs && is_custom_config_valid(cust_cfgs, dev)) {
|
||||
temp = devm_kzalloc(dev, sizeof(*cust_cfgs), GFP_KERNEL);
|
||||
if (temp)
|
||||
memcpy(temp, cust_cfgs, sizeof(*cust_cfgs));
|
||||
else
|
||||
dev_warn(dev, "%s:%d: allocation error\n", __func__,
|
||||
__LINE__);
|
||||
pd->custom_configs = temp;
|
||||
}
|
||||
|
||||
/*
|
||||
* Copy timings and min-tck values from platform data. If it is not
|
||||
* available or if memory allocation fails, use JEDEC defaults
|
||||
*/
|
||||
size = sizeof(struct lpddr2_timings) * pd->timings_arr_size;
|
||||
if (pd->timings) {
|
||||
temp = devm_kzalloc(dev, size, GFP_KERNEL);
|
||||
if (temp) {
|
||||
memcpy(temp, pd->timings, sizeof(*pd->timings));
|
||||
pd->timings = temp;
|
||||
} else {
|
||||
dev_warn(dev, "%s:%d: allocation error\n", __func__,
|
||||
__LINE__);
|
||||
get_default_timings(emif);
|
||||
}
|
||||
} else {
|
||||
get_default_timings(emif);
|
||||
}
|
||||
|
||||
if (pd->min_tck) {
|
||||
temp = devm_kzalloc(dev, sizeof(*pd->min_tck), GFP_KERNEL);
|
||||
if (temp) {
|
||||
memcpy(temp, pd->min_tck, sizeof(*pd->min_tck));
|
||||
pd->min_tck = temp;
|
||||
} else {
|
||||
dev_warn(dev, "%s:%d: allocation error\n", __func__,
|
||||
__LINE__);
|
||||
pd->min_tck = &lpddr2_jedec_min_tck;
|
||||
}
|
||||
} else {
|
||||
pd->min_tck = &lpddr2_jedec_min_tck;
|
||||
}
|
||||
|
||||
out:
|
||||
return emif;
|
||||
|
||||
error:
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static int __init_or_module emif_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct emif_data *emif;
|
||||
struct resource *res;
|
||||
|
||||
emif = get_device_details(pdev);
|
||||
if (!emif) {
|
||||
pr_err("%s: error getting device data\n", __func__);
|
||||
goto error;
|
||||
}
|
||||
|
||||
if (!emif1)
|
||||
emif1 = emif;
|
||||
|
||||
list_add(&emif->node, &device_list);
|
||||
|
||||
/* Save pointers to each other in emif and device structures */
|
||||
emif->dev = &pdev->dev;
|
||||
platform_set_drvdata(pdev, emif);
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
if (!res) {
|
||||
dev_err(emif->dev, "%s: error getting memory resource\n",
|
||||
__func__);
|
||||
goto error;
|
||||
}
|
||||
|
||||
emif->base = devm_request_and_ioremap(emif->dev, res);
|
||||
if (!emif->base) {
|
||||
dev_err(emif->dev, "%s: devm_request_and_ioremap() failed\n",
|
||||
__func__);
|
||||
goto error;
|
||||
}
|
||||
|
||||
dev_info(&pdev->dev, "%s: device configured with addr = %p\n",
|
||||
__func__, emif->base);
|
||||
|
||||
return 0;
|
||||
error:
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
static struct platform_driver emif_driver = {
|
||||
.driver = {
|
||||
.name = "emif",
|
||||
},
|
||||
};
|
||||
|
||||
static int __init_or_module emif_register(void)
|
||||
{
|
||||
return platform_driver_probe(&emif_driver, emif_probe);
|
||||
}
|
||||
|
||||
static void __exit emif_unregister(void)
|
||||
{
|
||||
platform_driver_unregister(&emif_driver);
|
||||
}
|
||||
|
||||
module_init(emif_register);
|
||||
module_exit(emif_unregister);
|
||||
MODULE_DESCRIPTION("TI EMIF SDRAM Controller Driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS("platform:emif");
|
||||
MODULE_AUTHOR("Texas Instruments Inc");
|
||||
|
|
@ -12,6 +12,13 @@
|
|||
#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
|
||||
|
||||
/* Registers offset */
|
||||
#define EMIF_MODULE_ID_AND_REVISION 0x0000
|
||||
#define EMIF_STATUS 0x0004
|
||||
|
|
|
|||
|
|
@ -0,0 +1,128 @@
|
|||
/*
|
||||
* 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 */
|
||||
Загрузка…
Ссылка в новой задаче