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-=======================
-S3C24XX Suspend Support
-=======================
-
-
-Introduction
-------------
-
-  The S3C24XX supports a low-power suspend mode, where the SDRAM is kept
-  in Self-Refresh mode, and all but the essential peripheral blocks are
-  powered down. For more information on how this works, please look
-  at the relevant CPU datasheet from Samsung.
-
-
-Requirements
-------------
-
-  1) A bootloader that can support the necessary resume operation
-
-  2) Support for at least 1 source for resume
-
-  3) CONFIG_PM enabled in the kernel
-
-  4) Any peripherals that are going to be powered down at the same
-     time require suspend/resume support.
-
-
-Resuming
---------
-
-  The S3C2410 user manual defines the process of sending the CPU to
-  sleep and how it resumes. The default behaviour of the Linux code
-  is to set the GSTATUS3 register to the physical address of the
-  code to resume Linux operation.
-
-  GSTATUS4 is currently left alone by the sleep code, and is free to
-  use for any other purposes (for example, the EB2410ITX uses this to
-  save memory configuration in).
-
-
-Machine Support
----------------
-
-  The machine specific functions must call the s3c_pm_init() function
-  to say that its bootloader is capable of resuming. This can be as
-  simple as adding the following to the machine's definition:
-
-  INITMACHINE(s3c_pm_init)
-
-  A board can do its own setup before calling s3c_pm_init, if it
-  needs to setup anything else for power management support.
-
-  There is currently no support for over-riding the default method of
-  saving the resume address, if your board requires it, then contact
-  the maintainer and discuss what is required.
-
-  Note, the original method of adding an late_initcall() is wrong,
-  and will end up initialising all compiled machines' pm init!
-
-  The following is an example of code used for testing wakeup from
-  an falling edge on IRQ_EINT0::
-
-
-    static irqreturn_t button_irq(int irq, void *pw)
-    {
-	return IRQ_HANDLED;
-    }
-
-    statuc void __init machine_init(void)
-    {
-	...
-
-	request_irq(IRQ_EINT0, button_irq, IRQF_TRIGGER_FALLING,
-		   "button-irq-eint0", NULL);
-
-	enable_irq_wake(IRQ_EINT0);
-
-	s3c_pm_init();
-    }
-
-
-Debugging
----------
-
-  There are several important things to remember when using PM suspend:
-
-  1) The uart drivers will disable the clocks to the UART blocks when
-     suspending, which means that use of printascii() or similar direct
-     access to the UARTs will cause the debug to stop.
-
-  2) While the pm code itself will attempt to re-enable the UART clocks,
-     care should be taken that any external clock sources that the UARTs
-     rely on are still enabled at that point.
-
-  3) If any debugging is placed in the resume path, then it must have the
-     relevant clocks and peripherals setup before use (ie, bootloader).
-
-     For example, if you transmit a character from the UART, the baud
-     rate and uart controls must be setup beforehand.
-
-
-Configuration
--------------
-
-  The S3C2410 specific configuration in `System Type` defines various
-  aspects of how the S3C2410 suspend and resume support is configured
-
-  `S3C2410 PM Suspend debug`
-
-    This option prints messages to the serial console before and after
-    the actual suspend, giving detailed information on what is
-    happening
-
-
-  `S3C2410 PM Suspend Memory CRC`
-
-    Allows the entire memory to be checksummed before and after the
-    suspend to see if there has been any corruption of the contents.
-
-    Note, the time to calculate the CRC is dependent on the CPU speed
-    and the size of memory. For an 64Mbyte RAM area on an 200MHz
-    S3C2410, this can take approximately 4 seconds to complete.
-
-    This support requires the CRC32 function to be enabled.
-
-
-  `S3C2410 PM Suspend CRC Chunksize (KiB)`
-
-    Defines the size of memory each CRC chunk covers. A smaller value
-    will mean that the CRC data block will take more memory, but will
-    identify any faults with better precision
-
-
-Document Author
----------------
-
-Ben Dooks, Copyright 2004 Simtec Electronics