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-TI EMIF SDRAM Controller Driver:
-Aneesh V <>
-Supported SoCs:
-TI OMAP44xx
-TI OMAP54xx
-Menuconfig option:
-Device Drivers
- Memory devices
- Texas Instruments EMIF driver
-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()
-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.