diff options
| author |   Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
|---|---|---|
| committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
| commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
| tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/include/linux/spi/spi_bitbang.h | |
| parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) | |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/include/linux/spi/spi_bitbang.h')
| -rw-r--r-- | kernel/include/linux/spi/spi_bitbang.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/kernel/include/linux/spi/spi_bitbang.h b/kernel/include/linux/spi/spi_bitbang.h new file mode 100644 index 000000000..85578d4be --- /dev/null +++ b/kernel/include/linux/spi/spi_bitbang.h @@ -0,0 +1,47 @@ +#ifndef __SPI_BITBANG_H +#define __SPI_BITBANG_H + +#include <linux/workqueue.h> + +struct spi_bitbang { + spinlock_t lock; + u8 busy; + u8 use_dma; + u8 flags; /* extra spi->mode support */ + + struct spi_master *master; + + /* setup_transfer() changes clock and/or wordsize to match settings + * for this transfer; zeroes restore defaults from spi_device. + */ + int (*setup_transfer)(struct spi_device *spi, + struct spi_transfer *t); + + void (*chipselect)(struct spi_device *spi, int is_on); +#define BITBANG_CS_ACTIVE 1 /* normally nCS, active low */ +#define BITBANG_CS_INACTIVE 0 + + /* txrx_bufs() may handle dma mapping for transfers that don't + * already have one (transfer.{tx,rx}_dma is zero), or use PIO + */ + int (*txrx_bufs)(struct spi_device *spi, struct spi_transfer *t); + + /* txrx_word[SPI_MODE_*]() just looks like a shift register */ + u32 (*txrx_word[4])(struct spi_device *spi, + unsigned nsecs, + u32 word, u8 bits); +}; + +/* you can call these default bitbang->master methods from your custom + * methods, if you like. + */ +extern int spi_bitbang_setup(struct spi_device *spi); +extern void spi_bitbang_cleanup(struct spi_device *spi); +extern int spi_bitbang_setup_transfer(struct spi_device *spi, + struct spi_transfer *t); + +/* start or stop queue processing */ +extern int spi_bitbang_start(struct spi_bitbang *spi); +extern void spi_bitbang_stop(struct spi_bitbang *spi); + +#endif /* __SPI_BITBANG_H */ |