[Suzaku-en:00059] Re: FPGA registers

Ye Zijia email@hidden
Fri Oct 14 17:18:34 JST 2005


Hi,
    is it possible for a more detailed explanations on how to apply the patch ?
 
Regards,
 
Zijia

	-----Original Message----- 
	From: email@hidden on behalf of Yasushi SHOJI 
	Sent: Fri 10/14/2005 11:40 AM 
	To: Ford Sleeman 
	Cc: email@hidden 
	Subject: [Suzaku-en:00058] Re: FPGA registers
	
	

	At Thu, 13 Oct 2005 09:38:24 -0400,
	Ford Sleeman wrote:
	>
	> Hi everybody,
	>
	> I have been trying to access registers in an IP core on the Suzaku-V
	> board but have been unsuccessful. Has anybody done this before? If so,
	> could somebody send me some sample C code of how to read and write to
	> these registers?
	
	ok, here is a simple way to _read_ gpio on sv. the gpio it's reading
	is connected to the boot mode select jumper (JP2).  so the value
	should change if you open/close the jumper.
	
	if you need to expose it to userland, you need to create char dev for
	it.
	
	i'm attaching a patch against suzaku6 tarball.  apply it and select
	simple test driver in char driver section in menuconfig.
	
	regards,
	--
	        yashi
	
	
	 linux-2.4.x/drivers/char/Config.in |    2 ++
	 linux-2.4.x/drivers/char/Makefile  |    2 ++
	 linux-2.4.x/drivers/char/simple.c  |   20 ++++++++++++++++++++
	 3 files changed, 24 insertions(+)
	
	Index: uClinux-dist-20040408-suzaku6/linux-2.4.x/drivers/char/Config.in
	===================================================================
	--- uClinux-dist-20040408-suzaku6.orig/linux-2.4.x/drivers/char/Config.in       2005-03-19 10:57:57.000000000 +0900
	+++ uClinux-dist-20040408-suzaku6/linux-2.4.x/drivers/char/Config.in    2005-10-14 11:51:28.000000000 +0900
	@@ -4,6 +4,8 @@
	 mainmenu_option next_comment
	 comment 'Character devices'
	
	+tristate 'Simple test driver' CONFIG_SIMPLE
	+
	 #############################################################################
	 #
	 # uClinux options
	Index: uClinux-dist-20040408-suzaku6/linux-2.4.x/drivers/char/Makefile
	===================================================================
	--- uClinux-dist-20040408-suzaku6.orig/linux-2.4.x/drivers/char/Makefile        2005-03-19 10:57:57.000000000 +0900
	+++ uClinux-dist-20040408-suzaku6/linux-2.4.x/drivers/char/Makefile     2005-10-14 11:50:51.000000000 +0900
	@@ -446,6 +446,8 @@ ifeq ($(CONFIG_IPMI_HANDLER),y)
	   obj-y += ipmi/ipmi.o
	 endif
	
	+obj-$(CONFIG_SIMPLE) += simple.o
	+
	 include $(TOPDIR)/Rules.make
	
	 fastdep:
	Index: uClinux-dist-20040408-suzaku6/linux-2.4.x/drivers/char/simple.c
	===================================================================
	--- /dev/null   1970-01-01 00:00:00.000000000 +0000
	+++ uClinux-dist-20040408-suzaku6/linux-2.4.x/drivers/char/simple.c     2005-10-14 12:32:27.000000000 +0900
	@@ -0,0 +1,20 @@
	+#include <linux/init.h>
	+#include <linux/kernel.h>
	+#include <asm/io.h>
	+
	+static int simple_init(void)
	+{
	+       unsigned int *p;
	+       p = ioremap(0xf0ffa000, 0x4);
	+       if (!p)
	+               return -ENOMEM;
	+
	+       printk("**** register: %#x\n", readl(p));
	+       iounmap(p);
	+}
	+module_init(simple_init);
	+
	+static void simple_exit(void)
	+{
	+}
	+module_exit(simple_exit);
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