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| author |   Wolfram Sang <w.sang@pengutronix.de> | 2011-08-31 20:35:40 +0200 |
|---|---|---|
| committer | Wolfram Sang <w.sang@pengutronix.de> | 2012-04-20 23:27:08 +0200 |
| commit | 4ccf4beab8c447f8cd33d46afb6e10e1aa3befc6 (patch) | |
| tree | 2291a9cb2b1fa2bbb94bbcb9df3c9cf8588fc176 /include/linux/stmp_device.h | |
| parent | Linux 3.4-rc3 (diff) | |
| download | linux-dev-4ccf4beab8c447f8cd33d46afb6e10e1aa3befc6.tar.xz linux-dev-4ccf4beab8c447f8cd33d46afb6e10e1aa3befc6.zip | |
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.h | 20 |
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__ */ |