linux-toradex.git/drivers/memory/emif.c, branch v3.6.1

memory: emif: add debugfs entries for emif

2012-05-02T18:00:08+00:00

Add debug entries for:
	1. calculated registers per frequency
	2. last polled value of MR4(temperature level
	   of LPDDR2 memory)

Signed-off-by: Aneesh V 
Reviewed-by: Santosh Shilimkar 
Reviewed-by: Benoit Cousson 
[santosh.shilimkar@ti.com: Moved to drivers/memory from drivers/misc]
Signed-off-by: Santosh Shilimkar 
Tested-by: Lokesh Vutla 
Signed-off-by: Greg Kroah-Hartman

memory: emif: add one-time settings

2012-05-02T17:58:12+00:00

Add settings that are not dependent on frequency
or any other transient parameters. This includes
- power managment control init
- impedence calibration control
- frequency independent phy configuration registers
- initialization of temperature polling

Signed-off-by: Aneesh V 
Reviewed-by: Santosh Shilimkar 
Reviewed-by: Benoit Cousson 
[santosh.shilimkar@ti.com: Moved to drivers/memory from drivers/misc]
Signed-off-by: Santosh Shilimkar 
Tested-by: Lokesh Vutla 
Signed-off-by: Greg Kroah-Hartman

memory: emif: add interrupt and temperature handling

2012-05-02T17:56:30+00:00

Add an ISR for EMIF that:
	1. reports details of access errors
	2. takes action on thermal events

Also clear all interrupts on shut-down. Pending IRQs
may casue problems during warm-reset.

Temperature handling:
EMIF can be configured to poll the temperature level
of an LPDDR2 device from the MR4 mode register in the
device. EMIF generates an interrupt whenever it identifies
a temperature level change between two consecutive pollings.

Some of the timing parameters need to be de-rated at high
temperatures. The interrupt handler takes care of doing
this and also takes care of going back to nominal settings
when temperature falls back to nominal levels.

Signed-off-by: Aneesh V 
Reviewed-by: Santosh Shilimkar 
Reviewed-by: Benoit Cousson 
[santosh.shilimkar@ti.com: Moved to drivers/memory from drivers/misc]
Signed-off-by: Santosh Shilimkar 
Signed-off-by: Greg Kroah-Hartman

memory: emif: handle frequency and voltage change events

2012-05-02T17:52:09+00:00

Change SDRAM timings and other settings as necessary
on voltage and frequency changes. We calculate these
register settings based on data from the device data
sheet and inputs such a frequency, voltage state(stable
or ramping), temperature level etc.

TODO: frequency and voltage change handling needs to
be integrated with clock framework and regulator
framework respectively. This is not done today
due to missing pieces in the kernel.

Signed-off-by: Aneesh V 
Reviewed-by: Santosh Shilimkar 
Reviewed-by: Benoit Cousson 
[santosh.shilimkar@ti.com: Moved to drivers/memory from drivers/misc]
Signed-off-by: Santosh Shilimkar 
Tested-by: Lokesh Vutla 
Signed-off-by: Greg Kroah-Hartman

memory: emif: add basic infrastructure for EMIF driver

2012-05-02T07:10:49+00:00

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 
Reviewed-by: Santosh Shilimkar 
Reviewed-by: Benoit Cousson 
[santosh.shilimkar@ti.com: Moved to drivers/memory from drivers/misc]
Signed-off-by: Santosh Shilimkar 
Tested-by: Lokesh Vutla 
Signed-off-by: Greg Kroah-Hartman