Eric Lee / smarc-uboot

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d41ce506b   Eric Lee   Initial Release, ... 
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  /*
   * (C) Copyright 2008-2009
   * BuS Elektronik GmbH & Co. KG <www.bus-elektronik.de>
   * Jens Scharsig <esw@bus-elektronik.de>
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  U-Boot vcxk video controller driver
  ======================================
  
  By defining CONFIG_VIDEO_VCXK this driver can be used with VC2K, VC4K and
  VC8K devices on following boards:
  
  board           | ARCH          | Vendor
  -----------------------------------------------------------------------
  EB+CPU5282-T1   | MCF5282       | BuS Elektronik GmbH & Co. KG
  EB+MCF-EVB123   | MCF5282       | BuS Elektronik GmbH & Co. KG
  EB+CPUx9K2      | AT91RM9200    | BuS Elektronik GmbH & Co. KG
  ZLSA            | AT91RM9200    | Ruf Telematik AG
  
  Driver configuration
  --------------------
  
  The driver needs some defines to describe the target hardware:
  
  CONFIG_SYS_VCXK_BASE
  
  	base address of VCxK hardware memory
  
  CONFIG_SYS_VCXK_DEFAULT_LINEALIGN
  
  	defines the physical alignment of a pixel row
  
  CONFIG_SYS_VCXK_DOUBLEBUFFERED
  
  	some boards that use vcxk prevent read from framebuffer memory.
  	define this option to enable double buffering (needs 16KiB RAM)
  
  CONFIG_SYS_VCXK_<xxxx>_PIN
  
  	defines the number of the I/O line PIN in the port
  	valid values for <xxxx> are:
  
  		ACKNOWLEDGE
  			describes the acknowledge line from vcxk hardware
  
  		ENABLE
  			describes the enable line to vcxk hardware
  
  		INVERT
  			describes the invert line to vcxk hardware
  
  		RESET
  			describes the reset line to vcxk hardware
  
  		REQUEST
  			describes the request line to vcxk hardware
  
  CONFIG_SYS_VCXK_<xxxx>_PORT
  
  	defines the I/O port which is connected with the line
  	for valid values for <xxxx> see CONFIG_SYS_VCXK_<xxxx>_PIN
  
  CONFIG_SYS_VCXK_<xxxx>_DDR
  
  	defines the register which configures the direction
  	for valid values for <xxxx> see CONFIG_SYS_VCXK_<xxxx>_PIN