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path: root/drivers/spi/dw_spi.c
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2010-01-21spi/dw_spi: fix missing export of dw_spi_remove_hostFeng Tang
So that interface drivers could be built as modules Signed-off-by: Feng Tang <feng.tang@intel.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-01-21spi/dw_spi: conditional transfer mode changesGeorge Shore
This allows the switching between transfer modes between 'transmit only', 'receive only' and 'transmit and receive' modes. Due to the design of the SPI block, changing transfer modes requires that the block be disabled; in doing so the chipselect line is inherently deasserted and (usually) the attached device discards its state. Consequentially, switching modes requires that a platform-specific chipselect function has been defined so that the chipselect is not dropped during the change. Signed-off-by: George Shore <george@georgeshore.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-01-21spi/dw_spi: remove conditional from 'poll_transfer'.George Shore
The 'poll_transfer' function employs a conditional to test whether the transmit buffer is valid; in doing so, on a receive operation no data is clocked out, thus no data is clocked in and ultimately errors appear. This removes the conditional as the transmit function will be set to a null writer when the transmit buffer is invalid, allowing the driver to clock 0x00 out to the device to receive data from the device. Signed-off-by: George Shore <george@georgeshore.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-01-21spi/dw_spi: fixed a spelling typo in a warning message.George Shore
Signed-off-by: George Shore <george@georgeshore.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-01-21spi/dw_spi: add return value to empty mrst_spi_debugfs_init()George Shore
As per the function signature. Signed-off-by: George Shore <george@georgeshore.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-01-21spi/dw_spi: add a FIFO depth detectionFeng Tang
FIFO depth is configurable for each implementation of DW core, so add a depth detection for those interface drivers who don't set the fifo_len explicitly Signed-off-by: Feng Tang <feng.tang@intel.com> Acked-by: Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-01-20spi/dw_spi: fix __init/__devinit section mismatchGrant Likely
Section mismatch in reference from the function dw_spi_add_host() to the function init_queue() Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-01-20spi/dw_spi: refine the IRQ mode working flowFeng Tang
Now dw_spi core fully supports 3 transfer modes: pure polling, DMA and IRQ mode. IRQ mode will use the FIFO half empty as the IRQ trigger, so each interface driver need set the fifo_len, so that core driver can handle it properly Signed-off-by: Feng Tang <feng.tang@intel.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-01-20spi/dw_spi: bug fix in wait_till_not_busy()Feng Tang
Make the driver wait at least for 1 jiffie before issuing the warning, no matter what HZ is set to Signed-off-by: Feng Tang <feng.tang@intel.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-12-17spi: controller driver for Designware SPI coreFeng Tang
Driver for the Designware SPI core, it supports multipul interfaces like PCI/APB etc. User can use "dw_apb_ssi_db.pdf" from Synopsys as HW datasheet. [randy.dunlap@oracle.com: fix build] [akpm@linux-foundation.org: build fix] Signed-off-by: Feng Tang <feng.tang@intel.com> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>