ARM i.MX31: add SPI support ...

The i.MX31 SPI interface was refered by freescale as spi_ver_0_4 in one
of their older vendor extended linux releases. spi_ver_0_4 differs only
in minor aspects to spi_ver_0_7 (i.MX35) which is already supported by
barebox.
Regarding barebox, the differences boil down to the location and length
of the CHIP SELECT and BIT COUNT/BURST LENGTH elements of CONREG. The
spi_ver_0_4 variant is limited to single word bursts with a maximum of
32 bits_per_word.

Add support for the i.MX31 SPI interface to the barebox spi_ver_0_7
implementation.

Signed-off-by: Alexander Kurz <akurz@blala.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

spi: i.MX: optimize transfers for ECSPI v2.3 ...

Instead of writing one word to the txfifo and then wait until
one is received in the rxfifo we can write while the txfifos
are not full and read as long the rxfifos contain data. This
makes transfers for the m25p80 driver around 7 times faster
here.

Unlike the last version this time we only optimize the common
case with 8 bits per word and SPI_LSB_FIRST cleared. The other
cases would require more bit shuffling of the data.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Revert "spi: i.MX: optimize transfers for ECSPI v2.3" ...

This does not work on the Efika MX Smartbook which uses SPI
to connect the MC13892. Needs some rework.

This reverts commit 746a553.

spi: i.MX: optimize transfers for ECSPI v2.3 ...

Instead of writing one word to the txfifo and then wait until
one is received in the rxfifo we can write until the txfifos
are not full and read as long the rxfifos contain data. This
makes transfers for the m25p80 driver around 7 times faster
here.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

spi: i.MX: use start mode control bit ...

The i.MX SPI controller in version 2.3 can immediately start a transfer
when the txfifo is written to. In this mode we no longer have to trigger
the transfer with the xch bit which makes the code a bit simpler.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

spi: i.MX: move register defines to include/ ...

The register defines will be used by the SPI xload code, so move
them to a place where the xload code can include them.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

spi: Add SPI GPIO bitbang driver ...

This adds a driver for SPI master by GPIO pins.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Documentation: remove doxygen documentation ...

The doxygen documentation is long outdated. Remove it. It will
be replaced with sphinx based documentation later.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

spi: Call spi_of_register_slaves from core ...

Makes individual handling of OF spi slaves unnecessary in the bus drivers.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

treewide include/: Add missing includes ...

This adds several missing includes to files under include/ which
we relied on being included implicitly.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Introduce device_spi_driver() macro and use it for SPI drivers ...

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

SPI: Rename spi_register_driver() for using with register_driver_macro() ...

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

spi: fix compiler warning ...

Fixes:
 drivers/spi/spi.c:59: warning: no previous prototype for 'spi_new_device'

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/spi'

spi: introduce spi_get_master ...

so we can request a master usefull for the spi command

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: add dataflash support ...

from linux 3.6

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

spi: add oftree support ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

SPI: Put SPI devices on their own bus ...

This patch adds a SPI bus on which the SPI devices and drivers register.
This makes it cleaner as SPI devices won't accidently end up probed by
a platform_device driver.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

spi: indicate in the docs that per-transfer bpw setting is not supported ...

Currently it's not implemented by any driver so add a note to the
documentation.

Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

nor: Add SPI flash driver ...

This patch adds the m25p80 driver. It has been ported from
Linux. MTD code has been removed. It has been tested with
a m25p40 chip and the Altera SPI master driver.

Signed-off-by: Franck Jullien <franck.jullien@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

spi: add bits_per_word to proxy structure ...

During the creation of a new spi device, we need to
have the possiblility to give the bits_per_word value
to master->setup.

As a matter of fact, spi master could check the spi
device bits_per_word and compare this value against its
capabilities.

Signed-off-by: Franck Jullien <franck.jullien@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

eeprom: add at25 eeprom driver ...

This commit adds support for most spi eeproms, such as the
Atmel at25 models.

Signed-off-by: Hubert Feurstein <h.feurstein@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

spi: add more spi transfer functions ...

This commit adds the following spi transfer functions:
  - spi_write
  - spi_read
  - spi_write_then_read
  - spi_w8r8

The code has been ported from the linux kernel.

Signed-off-by: Hubert Feurstein <h.feurstein@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

spi: add platform_data pointer to spi_board_info ...

In the spi layer this pointer will be assigned to the
platform_data pointer of the new spi device, thus it can
be accessed in the drivers 'probe' handler.

Signed-off-by: Hubert Feurstein <h.feurstein@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

documentation updates ...

Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

SPI: Add empty spi_register_board_info function when SPI is disabled ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

first (partly) running spi support

beginning of SPI support