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* Davinci: SPI: add the missing v2 patch changesNick Thompson2010-07-05-2/+6
| | | | | | | | | | Two Indentation fixes. Catch requests for full-duplex transfers when driver configured for half-duplex operation only. Signed-off-by: Nick Thompson <nick.thompson@ge.com> Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
* Davinci: SPI performance enhancementsNick Thompson2010-06-22-67/+128
| | | | | | | | | | | | | | | | | | | | | | | | | | | The following restructuring and optimisations increase the SPI read performance from 1.3MiB/s (on da850) to 2.87MiB/s (on da830): Remove continual revaluation of driver state from the core of the copy loop. State can not change during the copy loop, so it is possible to move these evaluations to before the copy loop. Cost is more code space as loop variants are required for each set of possible configurations. The loops are simpler however, so the extra is only 128bytes on da830 with CONFIG_SPI_HALF_DUPLEX defined. Unrolling the first copy loop iteration allows the TX buffer to be pre-loaded reducing SPI clock starvation. Unrolling the last copy loop iteration removes testing for the final loop iteration every time round the loop. Using the RX buffer empty flag as a transfer throttle allows the assumption that it is always safe to write to the TX buffer, so polling of TX buffer full flag can be removed. Signed-off-by: Nick Thompson <nick.thompson@ge.com> Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
* DaVinci: Improve DaVinci SPI speed.Delio Brignoli2010-06-08-34/+43
| | | | | | | | | | | | | | | I have updated this patch based on the comments [1] by Wolfgang Denk and removed unused variables. [1][http://lists.denx.de/pipermail/u-boot/2010-May/071728.html] Reduce the number of reads per byte transferred on the BUF register from 2 to 1 and take advantage of the TX buffer in the SPI module. On LogicPD OMAP-L138 EVM, SPI read throughput goes up from ~0.8Mbyte/s to ~1.3Mbyte/s. Tested with a 2Mbyte image file. Remove unused variables in the spi_xfer() function. Signed-off-by: Delio Brignoli <dbrignoli@audioscience.com> Tested-by: Ben Gardiner <bengardiner@nanometrics.ca> Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
* Prepare v2010.03-rc1v2010.03-rc1Wolfgang Denk2010-03-12-1/+0
| | | | | | Coding style cleanup, update CHANGELOG. Signed-off-by: Wolfgang Denk <wd@denx.de>
* TI DaVinci: Driver for the davinci SPI controllerSekhar Nori2010-02-12-0/+223
This adds a driver for the SPI controller found on davinci based SoCs from Texas Instruments. Signed-off-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Sudhakar Rajashekhara <sudhakar.raj@ti.com> Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>