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authorWolfram Sang <w.sang@pengutronix.de>2011-08-31 22:35:40 +0400
committerWolfram Sang <w.sang@pengutronix.de>2012-04-21 01:27:08 +0400
commit4ccf4beab8c447f8cd33d46afb6e10e1aa3befc6 (patch)
tree2291a9cb2b1fa2bbb94bbcb9df3c9cf8588fc176 /include/linux/stmp_device.h
parente816b57a337ea3b755de72bec38c10c864f23015 (diff)
downloadlinux-4ccf4beab8c447f8cd33d46afb6e10e1aa3befc6.tar.xz
lib: add support for stmp-style devices
MX23/28 use IP cores which follow a register layout I have first seen on STMP3xxx SoCs. In this layout, every register actually has four u32: 1.) to store a value directly 2.) a SET register where every 1-bit sets the corresponding bit, others are unaffected 3.) same with a CLR register 4.) same with a TOG (toggle) register Also, the 2 MSBs in register 0 are always the same and can be used to reset the IP core. All this is strictly speaking not mach-specific (but IP core specific) and, thus, doesn't need to be in mach-mxs/include. At least mx6 also uses IP cores following this stmp-style. So: Introduce a stmp-style device, put the code and defines for that in a public place (lib/), and let drivers for stmp-style devices select that code. To avoid regressions and ease reviewing, the actual code is simply copied from mach-mxs. It definately wants updates, but those need a seperate patch series. Voila, mach dependency gone, reusable code introduced. Note that I didn't remove the duplicated code from mach-mxs yet, first the drivers have to be converted. Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Dong Aisheng <dong.aisheng@linaro.org>
Diffstat (limited to 'include/linux/stmp_device.h')
-rw-r--r--include/linux/stmp_device.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/stmp_device.h b/include/linux/stmp_device.h
new file mode 100644
index 000000000000..6cf7ec9547cf
--- /dev/null
+++ b/include/linux/stmp_device.h
@@ -0,0 +1,20 @@
+/*
+ * basic functions for devices following the "stmp" style register layout
+ *
+ * Copyright (C) 2011 Wolfram Sang, Pengutronix e.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __STMP_DEVICE_H__
+#define __STMP_DEVICE_H__
+
+#define STMP_OFFSET_REG_SET 0x4
+#define STMP_OFFSET_REG_CLR 0x8
+#define STMP_OFFSET_REG_TOG 0xc
+
+extern int stmp_reset_block(void __iomem *);
+#endif /* __STMP_DEVICE_H__ */