introduce-fiq-basis.patch

Adds a C-based FIQ ISR which is very convenient (and unusual --
normally you have to do FIQ ISR in assembler only).
Based on my article:

http://warmcat.com/_wp/2007/09/17/at91rm9200-fiq-faq-and-simple-example-code-patch/

Implemented as a platform device and driver.

Suspend / resume is tested and works.

Signed-off-by: Andy Green <andy@warmcat.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h b/include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h
new file mode 100644
index 00000000000..341f2bbd22b
--- /dev/null
+++ b/include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h
@@ -0,0 +1,28 @@
+#ifndef _LINUX_FIQ_IPC_H
+#define _LINUX_FIQ_IPC_H
+
+/*
+ * this defines the struct which is used to communicate between the FIQ
+ * world and the normal linux kernel world.  One of these structs is
+ * statically defined for you in the monolithic kernel so the FIQ ISR code
+ * can safely touch it any any time.
+ *
+ * You also want to include this file in your kernel module that wants to
+ * communicate with your FIQ code.  Add any kinds of vars that are used by
+ * the FIQ ISR and the module in here.
+ *
+ * To get you started there is just an int that is incremented every FIQ
+ * you can remove this when you are ready to customize, but it is useful
+ * for testing
+ */
+
+struct fiq_ipc {
+	u8 u8a[0]; /* placeholder */
+};
+
+/* actual definition lives in arch/arm/mach-s3c2440/fiq_c_isr.c */
+extern struct fiq_ipc fiq_ipc;
+
+extern void fiq_kick(void);  /* provoke a FIQ "immediately" */
+
+#endif /* _LINUX_FIQ_IPC_H */