Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 57 insertions, 0 deletions

diff --git a/arch/arm/include/asm/fiq.h b/arch/arm/include/asm/fiq.h
new file mode 100644
index 000000000..6bdfb4a47
--- /dev/null
+++ b/arch/arm/include/asm/fiq.h
@@ -0,0 +1,57 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  arch/arm/include/asm/fiq.h
+ *
+ * Support for FIQ on ARM architectures.
+ * Written by Philip Blundell <philb@gnu.org>, 1998
+ * Re-written by Russell King
+ *
+ * NOTE: The FIQ mode registers are not magically preserved across
+ * suspend/resume.
+ *
+ * Drivers which require these registers to be preserved across power
+ * management operations must implement appropriate suspend/resume handlers to
+ * save and restore them.
+ */
+
+#ifndef __ASM_FIQ_H
+#define __ASM_FIQ_H
+
+#include <asm/ptrace.h>
+
+struct fiq_handler {
+	struct fiq_handler *next;
+	/* Name
+	 */
+	const char *name;
+	/* Called to ask driver to relinquish/
+	 * reacquire FIQ
+	 * return zero to accept, or -<errno>
+	 */
+	int (*fiq_op)(void *, int relinquish);
+	/* data for the relinquish/reacquire functions
+	 */
+	void *dev_id;
+};
+
+extern int claim_fiq(struct fiq_handler *f);
+extern void release_fiq(struct fiq_handler *f);
+extern void set_fiq_handler(void *start, unsigned int length);
+extern void enable_fiq(int fiq);
+extern void disable_fiq(int fiq);
+
+/* helpers defined in fiqasm.S: */
+extern void __set_fiq_regs(unsigned long const *regs);
+extern void __get_fiq_regs(unsigned long *regs);
+
+static inline void set_fiq_regs(struct pt_regs const *regs)
+{
+	__set_fiq_regs(&regs->ARM_r8);
+}
+
+static inline void get_fiq_regs(struct pt_regs *regs)
+{
+	__get_fiq_regs(&regs->ARM_r8);
+}
+
+#endif