summaryrefslogtreecommitdiffstats
path: root/include/soc/arc/aux.h
diff options
context:
space:
mode:
authorVineet Gupta <vgupta@synopsys.com>2016-10-31 19:09:34 +0100
committerVineet Gupta <vgupta@synopsys.com>2016-11-30 20:54:25 +0100
commitc33a605dd6f36618f9f658e71c09fcdcb44fc500 (patch)
treeac77c51dbe5bf8a8498600ca4da4cb4f46fc6656 /include/soc/arc/aux.h
parentARC: time: move time_init() out of the driver (diff)
downloadlinux-c33a605dd6f36618f9f658e71c09fcdcb44fc500.tar.xz
linux-c33a605dd6f36618f9f658e71c09fcdcb44fc500.zip
ARC: breakout aux handling into a separate header
ARC timers use aux registers for programming and this paves way for moving ARC timer drivers into drivers/clocksource Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'include/soc/arc/aux.h')
-rw-r--r--include/soc/arc/aux.h63
1 files changed, 63 insertions, 0 deletions
diff --git a/include/soc/arc/aux.h b/include/soc/arc/aux.h
new file mode 100644
index 000000000000..8c3fb13e0452
--- /dev/null
+++ b/include/soc/arc/aux.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2016-2017 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#ifndef __SOC_ARC_AUX_H__
+#define __SOC_ARC_AUX_H__
+
+#ifdef CONFIG_ARC
+
+#define read_aux_reg(r) __builtin_arc_lr(r)
+
+/* gcc builtin sr needs reg param to be long immediate */
+#define write_aux_reg(r, v) __builtin_arc_sr((unsigned int)(v), r)
+
+#else /* !CONFIG_ARC */
+
+static inline int read_aux_reg(u32 r)
+{
+ return 0;
+}
+
+/*
+ * function helps elide unused variable warning
+ * see: http://lists.infradead.org/pipermail/linux-snps-arc/2016-November/001748.html
+ */
+static inline void write_aux_reg(u32 r, u32 v)
+{
+ ;
+}
+
+#endif
+
+#define READ_BCR(reg, into) \
+{ \
+ unsigned int tmp; \
+ tmp = read_aux_reg(reg); \
+ if (sizeof(tmp) == sizeof(into)) { \
+ into = *((typeof(into) *)&tmp); \
+ } else { \
+ extern void bogus_undefined(void); \
+ bogus_undefined(); \
+ } \
+}
+
+#define WRITE_AUX(reg, into) \
+{ \
+ unsigned int tmp; \
+ if (sizeof(tmp) == sizeof(into)) { \
+ tmp = (*(unsigned int *)&(into)); \
+ write_aux_reg(reg, tmp); \
+ } else { \
+ extern void bogus_undefined(void); \
+ bogus_undefined(); \
+ } \
+}
+
+
+#endif