Fedora kernel-2.6.17-1.2142_FC4 patched with stable patch-2.6.17.4-vs2.0.2-rc26.diff

[linux-2.6.git] / Documentation / arm / Samsung-S3C24XX / Overview.txt

diff --git a/Documentation/arm/Samsung-S3C24XX/Overview.txt b/Documentation/arm/Samsung-S3C24XX/Overview.txt
index 3af4d29..8c6ee68 100644 (file)
--- a/Documentation/arm/Samsung-S3C24XX/Overview.txt
+++ b/Documentation/arm/Samsung-S3C24XX/Overview.txt
@@ -10,6 +10,8 @@ Introduction
   by the 's3c2410' architecture of ARM Linux. Currently the S3C2410 and
   the S3C2440 are supported CPUs.
 
+  Support for the S3C2400 series is in progress.
+
 
 Configuration
 -------------
@@ -32,6 +34,11 @@ Machines
     A general purpose development board, see EB2410ITX.txt for further
     details
 
+  Simtec Electronics IM2440D20 (Osiris)
+
+    CPU Module from Simtec Electronics, with a S3C2440A CPU, nand flash
+    and a PCMCIA controller.
+
   Samsung SMDK2410
 
     Samsung's own development board, geared for PDA work.
@@ -81,7 +88,28 @@ Adding New Machines
 
   Any large scale modifications, or new drivers should be discussed
   on the ARM kernel mailing list (linux-arm-kernel) before being
-  attempted.
+  attempted. See http://www.arm.linux.org.uk/mailinglists/ for the
+  mailing list information.
+
+
+I2C
+---
+
+  The hardware I2C core in the CPU is supported in single master
+  mode, and can be configured via platform data.
+
+
+RTC
+---
+
+  Support for the onboard RTC unit, including alarm function.
+
+
+Watchdog
+--------
+
+  The onchip watchdog is available via the standard watchdog
+  interface.
 
 
 NAND
@@ -120,6 +148,53 @@ Clock Management
   various clock units
 
 
+Suspend to RAM
+--------------
+
+  For boards that provide support for suspend to RAM, the
+  system can be placed into low power suspend.
+
+  See Suspend.txt for more information.
+
+
+Platform Data
+-------------
+
+  Whenever a device has platform specific data that is specified
+  on a per-machine basis, care should be taken to ensure the
+  following:
+
+    1) that default data is not left in the device to confuse the
+       driver if a machine does not set it at startup
+
+    2) the data should (if possible) be marked as __initdata,
+       to ensure that the data is thrown away if the machine is
+       not the one currently in use.
+
+       The best way of doing this is to make a function that
+       kmalloc()s an area of memory, and copies the __initdata
+       and then sets the relevant device's platform data. Making
+       the function `__init` takes care of ensuring it is discarded
+       with the rest of the initialisation code
+
+       static __init void s3c24xx_xxx_set_platdata(struct xxx_data *pd)
+       {
+           struct s3c2410_xxx_mach_info *npd;
+
+          npd = kmalloc(sizeof(struct s3c2410_xxx_mach_info), GFP_KERNEL);
+          if (npd) {
+             memcpy(npd, pd, sizeof(struct s3c2410_xxx_mach_info));
+             s3c_device_xxx.dev.platform_data = npd;
+          } else {
+              printk(KERN_ERR "no memory for xxx platform data\n");
+          }
+       }
+
+       Note, since the code is marked as __init, it should not be
+       exported outside arch/arm/mach-s3c2410/, or exported to
+       modules via EXPORT_SYMBOL() and related functions.
+
+
 Port Contributors
 -----------------
 
@@ -149,8 +224,12 @@ Document Changes
   06 Mar 2005 - BJD - Added Christer Weinigel
   08 Mar 2005 - BJD - Added LCVR to list of people, updated introduction
   08 Mar 2005 - BJD - Added section on adding machines
+  09 Sep 2005 - BJD - Added section on platform data
+  11 Feb 2006 - BJD - Added I2C, RTC and Watchdog sections
+  11 Feb 2006 - BJD - Added Osiris machine, and S3C2400 information
+
 
 Document Author
 ---------------
 
-Ben Dooks, (c) 2004-2005 Simtec Electronics
+Ben Dooks, (c) 2004-2005,2006 Simtec Electronics