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- SM501 Driver
- ============
-Copyright 2006, 2007 Simtec Electronics
-The Silicon Motion SM501 multimedia companion chip is a multifunction device
-which may provide numerous interfaces including USB host controller USB gadget,
-asynchronous serial ports, audio functions, and a dual display video interface.
-The device may be connected by PCI or local bus with varying functions enabled.
-The core driver in drivers/mfd provides common services for the
-drivers which manage the specific hardware blocks. These services
-include locking for common registers, clock control and resource
-The core registers drivers for both PCI and generic bus based
-chips via the platform device and driver system.
-On detection of a device, the core initialises the chip (which may
-be specified by the platform data) and then exports the selected
-peripheral set as platform devices for the specific drivers.
-The core re-uses the platform device system as the platform device
-system provides enough features to support the drivers without the
-need to create a new bus-type and the associated code to go with it.
-Each peripheral has a view of the device which is implicitly narrowed to
-the specific set of resources that peripheral requires in order to
-function correctly.
-The centralised memory allocation allows the driver to ensure that the
-maximum possible resource allocation can be made to the video subsystem
-as this is by-far the most resource-sensitive of the on-chip functions.
-The primary issue with memory allocation is that of moving the video
-buffers once a display mode is chosen. Indeed when a video mode change
-occurs the memory footprint of the video subsystem changes.
-Since video memory is difficult to move without changing the display
-(unless sufficient contiguous memory can be provided for the old and new
-modes simultaneously) the video driver fully utilises the memory area
-given to it by aligning fb0 to the start of the area and fb1 to the end
-of it. Any memory left over in the middle is used for the acceleration
-functions, which are transient and thus their location is less critical
-as it can be moved.
-The platform device driver uses a set of platform data to pass
-configurations through to the core and the subsidiary drivers
-so that there can be support for more than one system carrying
-an SM501 built into a single kernel image.
-The PCI driver assumes that the PCI card behaves as per the Silicon
-Motion reference design.
-There is an errata (AB-5) affecting the selection of the
-of the M1XCLK and M1CLK frequencies. These two clocks
-must be sourced from the same PLL, although they can then
-be divided down individually. If this is not set, then SM501 may
-lock and hang the whole system. The driver will refuse to
-attach if the PLL selection is different.