litmus-rt.git/drivers/spi, branch v2.6.33.4

spi: spi_sh_msiof: Fixed data sampling on the correct edge

2010-02-02T02:29:15+00:00

The spi_sh_msiof.c driver presently misconfigures REDG and TEDG. TEDG==0
outputs data at the **rising edge** of the clock and REDG==0 samples data
at the **falling edge** of the clock. Therefore for SPI, TEDG must be
equal to REDG, otherwise the last byte received is not sampled in SPI
mode 3.

This brings the driver in line with the SH7723 HW Reference Manual
settings documented in Figures 20.20 and 20.21 ("SPI Clock and data
timing").

Signed-off-by: Markus Pietrek 
Acked-by: Magnus Damm 
Signed-off-by: Paul Mundt

Merge branch 'next-spi' of git://git.secretlab.ca/git/linux-2.6

2009-12-17T23:59:05+00:00

* 'next-spi' of git://git.secretlab.ca/git/linux-2.6:
  spi: spi_txx9.c: use resource_size()
  spi: spi_sh_sci.c: use resource_size()
  spi: spi_mpc8xxx.c: use resource_size()
  spi: spi_bfin5xx.c: use resource_size()
  spi: atmel_spi.c: use resource_size()
  spi: Add s3c64xx SPI Controller driver
  atmel_spi: fix dma addr calculation for len > BUFFER_SIZE
  spi_s3c24xx: add FIQ pseudo-DMA support
  spi: controller driver for Designware SPI core
  spidev: add proper section markers
  spidev: use DECLARE_BITMAP instead of declaring the array

spi: spi_txx9.c: use resource_size()

2009-12-17T16:00:22+00:00

Signed-off-by: H Hartley Sweeten 
Cc: David Brownell 
Cc: Atsushi Nemoto 
Signed-off-by: Grant Likely

spi: spi_sh_sci.c: use resource_size()

2009-12-17T16:00:10+00:00

Signed-off-by: H Hartley Sweeten 
Cc: David Brownell 
Signed-off-by: Grant Likely

spi: spi_mpc8xxx.c: use resource_size()

2009-12-17T16:00:02+00:00

Signed-off-by: H Hartley Sweeten 
Cc: David Brownell 
Cc: Kumar Gala 
Signed-off-by: Grant Likely

spi: spi_bfin5xx.c: use resource_size()

2009-12-17T15:59:50+00:00

Signed-off-by: H Hartley Sweeten 
Cc: David Brownell 
Cc: Bryan Wu 
Signed-off-by: Grant Likely

spi: atmel_spi.c: use resource_size()

2009-12-17T15:59:06+00:00

Signed-off-by: H Hartley Sweeten 
Cc: Haavard Skinnemoen 
Signed-off-by: Grant Likely

spi: Add s3c64xx SPI Controller driver

2009-12-17T15:58:17+00:00

Each SPI controller has exactly one CS line and as such doesn't
provide for multi-cs. We implement a workaround to support
multi-cs by _not_ configuring the mux'ed CS pin for each SPI
controller. The CS mechanism is assumed to be fully machine
specific - the driver doesn't even assume some GPIO pin is used
to control the CS.

The driver selects between DMA and POLLING mode depending upon
the xfer size - DMA mode for xfers bigger than FIFO size, POLLING
mode otherwise.

The driver has been designed to be capable of running SoCs since
s3c64xx and till date, for that reason some of the register fields
have been passed via, SoC specific, platform data.

Signed-off-by: Jassi Brar 
Signed-off-by: Grant Likely

atmel_spi: fix dma addr calculation for len > BUFFER_SIZE

2009-12-17T15:57:07+00:00

If len > BUFFER_LEN and !xfer->rx_buf we end up calculating the tx buffer
address as

*tx_dma = xfer->tx_dma + xfer->len - BUFFER_SIZE;

which is constant; i.e.  we just send the last BUFFER_SIZE data over again
until we've reached the right number of bytes.

This patch gets around this by using the /requested/ length when
calculating addresses.

Note there's no way len != *plen when we calculate the rx buffer address
but conceptually we should be using *plen and I don't want someone to come
through later, see the calculations for rx and tx are different and "clean
up" back to what we had.

Signed-off-by: Ben Nizette 
Cc: Haavard Skinnemoen 
Cc: David Brownell 
Signed-off-by: Andrew Morton 
Signed-off-by: Grant Likely

spi_s3c24xx: add FIQ pseudo-DMA support

2009-12-17T15:57:01+00:00

Add pseudo-DMA by FIQ to the S3C24XX SPI driver.  This allows the driver
to get DMA-like performance where there are either no free DMA channels or
when doing transfers that required both TX and RX data paths.

Since this patch requires the addition of an assembly file to hold the FIQ
code, we rename the module (instead of adding a rename of the .c file to
this patch).  We expect most users are loading this via udev and thus
there should be no change to the userland configuration.

Signed-off-by: Ben Dooks 
Signed-off-by: Simtec Linux Team 
Cc: David Brownell 
Signed-off-by: Andrew Morton 
Signed-off-by: Grant Likely