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path: root/drivers/memory/emif.c
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* memory: emif: add one-time settingsAneesh V2012-05-021-0/+148
| | | | | | | | | | | | | | | | | 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 <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>
* memory: emif: add interrupt and temperature handlingAneesh V2012-05-021-2/+209
| | | | | | | | | | | | | | | | | | | | | | | | | | | 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 <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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* memory: emif: handle frequency and voltage change eventsAneesh V2012-05-021-3/+891
| | | | | | | | | | | | | | | | | | | | | 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 <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>
* memory: emif: add basic infrastructure for EMIF driverAneesh V2012-05-021-0/+289
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>
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