spi driver added

1 files changed, 90 insertions, 0 deletions

diff --git a/driver/spi-spi_bitbang-clocking-fixes.patch b/driver/spi-spi_bitbang-clocking-fixes.patch
new file mode 100644
index 0000000000000..082ed054111f5
--- /dev/null
+++ b/driver/spi-spi_bitbang-clocking-fixes.patch
@@ -0,0 +1,90 @@
+From david-b@pacbell.net Thu Apr  6 23:03:36 2006
+From: David Brownell <david-b@pacbell.net>
+To: Greg KH <greg@kroah.com>
+Subject: SPI: spi_bitbang: clocking fixes
+Date: Thu, 6 Apr 2006 22:25:56 -0700
+Message-Id: <200604062225.56448.david-b@pacbell.net>
+
+This fixes two problems triggered by the MMC stack updating clocks:
+
+ - SPI masters driver should accept a max clock speed of zero; that's one
+   convention for marking idle devices.  (Presumably that helps controllers
+   that don't autogate clocks to "off" when not in use.)
+
+ - There are more than 1000 nanoseconds per millisecond; setting the clock
+   down to 125 KHz now works properly.
+
+Showing once again that Zero (http://en.wikipedia.org/wiki/Zero) is still
+an inexhaustible number of bugs.
+
+Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
+Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
+
+
+---
+ drivers/spi/spi_bitbang.c |   24 ++++++++++++++----------
+ 1 file changed, 14 insertions(+), 10 deletions(-)
+
+--- gregkh-2.6.orig/drivers/spi/spi_bitbang.c
++++ gregkh-2.6/drivers/spi/spi_bitbang.c
+@@ -167,9 +167,11 @@ int spi_bitbang_setup_transfer(struct sp
+ 	/* nsecs = (clock period)/2 */
+ 	if (!hz)
+ 		hz = spi->max_speed_hz;
+-	cs->nsecs = (1000000000/2) / hz;
+-	if (cs->nsecs > MAX_UDELAY_MS * 1000)
+-		return -EINVAL;
++	if (hz) {
++		cs->nsecs = (1000000000/2) / hz;
++		if (cs->nsecs > (MAX_UDELAY_MS * 1000 * 1000))
++			return -EINVAL;
++	}
+ 
+ 	return 0;
+ }
+@@ -184,9 +186,6 @@ int spi_bitbang_setup(struct spi_device 
+ 	struct spi_bitbang	*bitbang;
+ 	int			retval;
+ 
+-	if (!spi->max_speed_hz)
+-		return -EINVAL;
+-
+ 	bitbang = spi_master_get_devdata(spi->master);
+ 
+ 	/* REVISIT: some systems will want to support devices using lsb-first
+@@ -216,7 +215,7 @@ int spi_bitbang_setup(struct spi_device 
+ 	if (retval < 0)
+ 		return retval;
+ 
+-	dev_dbg(&spi->dev, "%s, mode %d, %u bits/w, %u nsec\n",
++	dev_dbg(&spi->dev, "%s, mode %d, %u bits/w, %u nsec/bit\n",
+ 			__FUNCTION__, spi->mode & (SPI_CPOL | SPI_CPHA),
+ 			spi->bits_per_word, 2 * cs->nsecs);
+ 
+@@ -405,6 +404,7 @@ int spi_bitbang_transfer(struct spi_devi
+ {
+ 	struct spi_bitbang	*bitbang;
+ 	unsigned long		flags;
++	int			status = 0;
+ 
+ 	m->actual_length = 0;
+ 	m->status = -EINPROGRESS;
+@@ -414,11 +414,15 @@ int spi_bitbang_transfer(struct spi_devi
+ 		return -ESHUTDOWN;
+ 
+ 	spin_lock_irqsave(&bitbang->lock, flags);
+-	list_add_tail(&m->queue, &bitbang->queue);
+-	queue_work(bitbang->workqueue, &bitbang->work);
++	if (!spi->max_speed_hz)
++		status = -ENETDOWN;
++	else {
++		list_add_tail(&m->queue, &bitbang->queue);
++		queue_work(bitbang->workqueue, &bitbang->work);
++	}
+ 	spin_unlock_irqrestore(&bitbang->lock, flags);
+ 
+-	return 0;
++	return status;
+ }
+ EXPORT_SYMBOL_GPL(spi_bitbang_transfer);
+