patch-2.4.21 linux-2.4.21/drivers/mtd/devices/slram.c

• Lines: 70
• Date: 2003-06-13 07:51:34.000000000 -0700
• Orig file: linux-2.4.20/drivers/mtd/devices/slram.c
• Orig date: 2001-10-04 15:14:59.000000000 -0700

diff -urN linux-2.4.20/drivers/mtd/devices/slram.c linux-2.4.21/drivers/mtd/devices/slram.c
@@ -1,6 +1,32 @@
 /*======================================================================
 
-  $Id: slram.c,v 1.25 2001/10/02 15:05:13 dwmw2 Exp $
+  $Id: slram.c,v 1.28 2003/01/24 13:35:34 dwmw2 Exp $
+
+  This driver provides a method to access memory not used by the kernel
+  itself (i.e. if the kernel commandline mem=xxx is used). To actually
+  use slram at least mtdblock or mtdchar is required (for block or
+  character device access).
+
+  Usage:
+
+  if compiled as loadable module:
+    modprobe slram map=<name>,<start>,<end/offset>
+  if statically linked into the kernel use the following kernel cmd.line
+    slram=<name>,<start>,<end/offset>
+
+  <name>: name of the device that will be listed in /proc/mtd
+  <start>: start of the memory region, decimal or hex (0xabcdef)
+  <end/offset>: end of the memory region. It's possible to use +0x1234
+                to specify the offset instead of the absolute address
+    
+  NOTE:
+  With slram it's only possible to map a contigous memory region. Therfore
+  if there's a device mapped somewhere in the region specified slram will
+  fail to load (see kernel log if modprobe fails).
+
+  -
+  
+  Jochen Schaeuble <psionic@psionic.de>
 
 ======================================================================*/
 
@@ -20,8 +46,6 @@
 #include <linux/init.h>
 #include <asm/io.h>
 #include <asm/system.h>
-#include <asm/segment.h>
-#include <stdarg.h>
 
 #include <linux/mtd/mtd.h>
 
@@ -53,7 +77,7 @@
 
 int slram_erase(struct mtd_info *, struct erase_info *);
 int slram_point(struct mtd_info *, loff_t, size_t, size_t *, u_char **);
-void slram_unpoint(struct mtd_info *, u_char *);
+void slram_unpoint(struct mtd_info *, u_char *, loff_t,	size_t);
 int slram_read(struct mtd_info *, loff_t, size_t, size_t *, u_char *);
 int slram_write(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
 
@@ -94,7 +118,7 @@
 	return(0);
 }
 
-void slram_unpoint(struct mtd_info *mtd, u_char *addr)
+void slram_unpoint(struct mtd_info *mtd, u_char *addr, loff_t from, size_t len)
 {
 }
 
@@ -177,7 +201,7 @@
 	(*curmtd)->mtdinfo->write = slram_write;
 	(*curmtd)->mtdinfo->module = THIS_MODULE;
 	(*curmtd)->mtdinfo->type = MTD_RAM;
-	(*curmtd)->mtdinfo->erasesize = 0x10000;
+	(*curmtd)->mtdinfo->erasesize = 0x0;
 
 	if (add_mtd_device((*curmtd)->mtdinfo))	{
 		E("slram: Failed to register new device\n");