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Based on kernel version 3.15.4. Page generated on 2014-07-07 09:03 EST.

1	TI EMIF SDRAM Controller Driver:
2	
3	Author
4	========
5	Aneesh V <aneesh@ti.com>
6	
7	Location
8	============
9	driver/memory/emif.c
10	
11	Supported SoCs:
12	===================
13	TI OMAP44xx
14	TI OMAP54xx
15	
16	Menuconfig option:
17	==========================
18	Device Drivers
19		Memory devices
20			Texas Instruments EMIF driver
21	
22	Description
23	===========
24	This driver is for the EMIF module available in Texas Instruments
25	SoCs. EMIF is an SDRAM controller that, based on its revision,
26	supports one or more of DDR2, DDR3, and LPDDR2 SDRAM protocols.
27	This driver takes care of only LPDDR2 memories presently. The
28	functions of the driver includes re-configuring AC timing
29	parameters and other settings during frequency, voltage and
30	temperature changes
31	
32	Platform Data (see include/linux/platform_data/emif_plat.h):
33	=====================================================================
34	DDR device details and other board dependent and SoC dependent
35	information can be passed through platform data (struct emif_platform_data)
36	- DDR device details: 'struct ddr_device_info'
37	- Device AC timings: 'struct lpddr2_timings' and 'struct lpddr2_min_tck'
38	- Custom configurations: customizable policy options through
39	  'struct emif_custom_configs'
40	- IP revision
41	- PHY type
42	
43	Interface to the external world:
44	================================
45	EMIF driver registers notifiers for voltage and frequency changes
46	affecting EMIF and takes appropriate actions when these are invoked.
47	- freq_pre_notify_handling()
48	- freq_post_notify_handling()
49	- volt_notify_handling()
50	
51	Debugfs
52	========
53	The driver creates two debugfs entries per device.
54	- regcache_dump : dump of register values calculated and saved for all
55	  frequencies used so far.
56	- mr4 : last polled value of MR4 register in the LPDDR2 device. MR4
57	  indicates the current temperature level of the device.
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