Documentation/driver-api/memory-devices/ti-emif.rst
Source file repositories/reference/linux-study-clean/Documentation/driver-api/memory-devices/ti-emif.rst
File Facts
- System
- Linux kernel
- Corpus path
Documentation/driver-api/memory-devices/ti-emif.rst- Extension
.rst- Size
- 1865 bytes
- Lines
- 65
- Domain
- Support Tooling And Documentation
- Bucket
- Documentation
- Inferred role
- Support Tooling And Documentation: documentation
- Status
- atlas-only
Why This File Exists
Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
- Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
- No C-style include directives detected by the generator.
Detected Declarations
- No top-level syscall, struct, function, initcall, or export declaration detected by the generator.
Annotated Snippet
.. SPDX-License-Identifier: GPL-2.0
===============================
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.Annotation
- Atlas domain: Support Tooling And Documentation / Documentation.
- Implementation status: atlas-only.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.