This patch gets rid of the spi_chipsel table and adds a handful of new
functions that makes the SPI layer cleaner and more flexible.

Instead of the spi_chipsel table, each board that wants to use SPI
gets to implement three hooks:
  * spi_cs_activate(): Activates the chipselect for a given slave
  * spi_cs_deactivate(): Deactivates the chipselect for a given slave
  * spi_cs_is_valid(): Determines if the given bus/chipselect
    combination can be activated.

Not all drivers may need those extra functions however. If that's the
case, the board code may just leave them out (assuming they know what
the driver needs) or rely on the linker to strip them out (assuming
--gc-sections is being used.)

To set up communication parameters for a given slave, the driver needs
to call spi_setup_slave(). This returns a pointer to an opaque
spi_slave struct which must be passed as a parameter to subsequent SPI
calls. This struct can be freed by calling spi_free_slave(), but most
driver probably don't want to do this.

Before starting one or more SPI transfers, the driver must call
spi_claim_bus() to gain exclusive access to the SPI bus and initialize
the hardware. When all transfers are done, the driver must call
spi_release_bus() to make the bus available to others, and possibly
shut down the SPI controller hardware.

spi_xfer() behaves mostly the same as before, but it now takes a
spi_slave parameter instead of a spi_chipsel function pointer. It also
got a new parameter, flags, which is used to specify chip select
behaviour. This may be extended with other flags in the future.

This patch has been build-tested on all powerpc and arm boards
involved. I have not tested NIOS since I don't have a toolchain for it
installed, so I expect some breakage there even though I've tried
fixing up everything I could find by visual inspection.

I have run-time tested this on AVR32 ATNGW100 using the atmel_spi and
DataFlash drivers posted as a follow-up. I'd like some help testing
other boards that use the existing SPI API.

But most of all, I'd like some comments on the new API. Is this stuff
usable for everyone? If not, why?

Changed in v4:
  - Build fixes for various boards, drivers and commands
  - Provide common struct spi_slave definition that can be extended by
    drivers
  - Pass a struct spi_slave * to spi_cs_activate and spi_cs_deactivate
  - Make default bus and mode build-time configurable
  - Override default SPI bus ID and mode on mx32ads and imx31_litekit.

Changed in v3:
  - Add opaque struct spi_slave for controller-specific data associated
    with a slave.
  - Add spi_claim_bus() and spi_release_bus()
  - Add spi_free_slave()
  - spi_setup() is now called spi_setup_slave() and returns a
    struct spi_slave
  - soft_spi now supports four SPI modes (CPOL|CPHA)
  - Add bus parameter to spi_setup_slave()
  - Convert the new i.MX32 SPI driver
  - Convert the new MC13783 RTC driver

Changed in v2:
  - Convert the mpc8xxx_spi driver and the mpc8349emds board to the
    new API.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Tested-by: Guennadi Liakhovetski <lg@denx.de>

AVR32 and AT91SAM9 both have their own identical definitions of
container_of() taken from the Linux kernel. Move it to common.h so
that all architectures can use it.

container_of() is already used by some drivers, and will be used
extensively by the new and improved SPI API.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

Spotted by Dean Capindale.

Systems that support open-drain GPIO properly are allowed provide an
empty I2C_TRISTATE define. However, this means that we need to be
careful not to drive SDA low when the slave is expected to respond.

This patch adds a missing I2C_SDA(1) to read_byte() required to
tristate the SDA line on systems that support open-drain GPIO.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

* The cfi_flash.c memset fix actual allows the board to boot so there is
  a bit more going on here than just resolving warnings associated with
  uninitialized variables.

* include/asm/bitops.h:302: warning: '__swab32p' is static but used in
  inline function 'ext2_find_next_zero_bit' which is not static

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

Currently, END_OF_RAM is used by the trap code to determine if
we should attempt to access the stack pointer or not. However,
on systems with a lot of RAM, only a subset of the RAM is
guaranteed to be mapped in and accessible.  Change END_OF_RAM
to use get_effective_memsize() instead of using the raw ram
size out of the bd.

Signed-off-by: Becky Bruce <becky.bruce@freescale.com>

If common.h isn't first we can get CONFIG_ options defined in the
board config file ignored.  This can cause an issue if any of those
config options impact the size of types of data structures
(eg CONFIG_PHYS_64BIT).

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

Add logbuffer to reserved LMB areas to prevent initrd allocation
from overlaping with it.

Make sure to use correct logbuffer base address.

Signed-off-by: Marian Balakowicz <m8@semihalf.com>

Signed-off-by: Becky Bruce <becky.bruce@freescale.com>

This function prints the values of all the BAT register
pairs - I needed this for debug earlier this week; adding it to
lib_ppc so others can use it (and add it to reginfo commands
if so desired).

Signed-off-by: Becky Bruce <becky.bruce@freescale.com>

Currently, this code only deals with BATs 0-3, which makes
it useless on systems that support BATs 4-7.  Add the
support for these registers.

Signed-off-by: Becky Bruce <Becky.bruce@freescale.com>

Change all code that conditionally operates on high bat
registers (that is, BATs 4-7) to look at CONFIG_HIGH_BATS
instead of the myriad ways this is done now.  Define the option
for every config for which high bats are supported (and
enabled by early boot, on parts where they're not always
enabled)

Signed-off-by: Becky Bruce <becky.bruce@freescale.com>

All other u-boot architectures have an include/asm/errno.h, so
this change adds it to the mips include/asm-mips headers also.

Stolen from Linux 2.6.25.

Signed-off-by: Jason McMullan <mcmullan@netapp.com>

Signed-off-by: Shinya Kuribayashi <skuribay@ruby.dti.ne.jp>

Signed-off-by: Shinya Kuribayashi <skuribay@ruby.dti.ne.jp>

No functional changes.

Signed-off-by: Shinya Kuribayashi <skuribay@ruby.dti.ne.jp>

The mips architecture currently does not call 'spi_init()' in the generic
board initialization routine is CONFIG_CMD_SPI is defined.

This patch rectifies that problem.

Signed-off-by: Jason McMullan <mcmullan@netapp.com>
Signed-off-by: Shinya Kuribayashi <skuribay@ruby.dti.ne.jp>

This patch adds the standard 'nand_init()' call to the mips generic
'board_init_r()' call, bringing MIPS in line with the other architectures.

Signed-off-by: Jason McMullan <mcmullan@netapp.com>
Signed-off-by: Shinya Kuribayashi <skuribay@ruby.dti.ne.jp>

Likewise with onenand_init().

Signed-off-by: Scott Wood <scottwood@freescale.com>

Don't assume types are provided by previously included headers.

Signed-off-by: Scott Wood <scottwood@freescale.com>

For NAND erase sizes smaller than one NAND erase block, erase
percentage output becomes grater than 100% e.g.

-- cut --
  > nand info
Device 0: NAND 64MiB 1,8V 8-bit, sector size 16 KiB
  > nand erase 0x100000 0x2000
NAND erase: device 0 offset 0x100000, size 0x2000
Erasing at 0x100000 -- 200% complete.
OK
  >
-- cut --

Correct this and give user a warning that more is erased than specified:

-- cut --
  > nand erase 0x100000 0x2000
NAND erase: device 0 offset 0x100000, size 0x2000
Warning: Erase size 0x00002000 smaller than one erase block 0x00004000
           Erasing 0x00004000 instead
Erasing at 0x100000 -- 100% complete.
OK
  >
-- cut --

Signed-off-by: Dirk Behme <dirk.behme@gmail.com>

The nand_info array is declared as extern in several .c files.
Those days, nand.h contains a reference to the array, so there is
no need to declare it elsewhere.

Signed-off-by: Stelian Pop <stelian@popies.net>
Signed-off-by: Scott Wood <scottwood@freescale.com>

This allows the header to be included regardless of whether a board's
config file provides NAND-related defininitions.

Signed-off-by: Scott Wood <scottwood@freescale.com>

If the specified delay is very short, the cycle counter may go past the
"end" time we are waiting for before we get around to reading it.

Fix it by checking the different between the cycle count "now" and the
cycle count at the beginning. This will work as long as the delay
measured in number of cycles is below 2^31.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

Remove #ifdef CONFIG_MMC from the source file and use conditional
compilation in the Makefile instead.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

Make sure we check for CRC errors when sending commands that use CRC
checking.

Reported-by: Gururaja Hebbar K R <gururajakr@sanyo.co.in>
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

The warnings are harmless but annoying. Let's fix them.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

This cleans up the SDRAM initialization and related code a bit, and
allows faster booting.

  * Add definitions for EBI and internal SRAM to asm/arch/memory-map.h
  * Remove memory test from sdram_init() and make caller responsible
    for verifying the SDRAM and determining its size.
  * Remove base_address member from struct sdram_config (was sdram_info)
  * Add data_bits member to struct sdram_config and kill CFG_SDRAM_16BIT
  * Add support for a common STK1000 hack: 16MB SDRAM instead of 8.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

Don't do a stack dump if the stack pointer is outside the memory area
reserved for stack.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

Since the reset vector is always aligned to a very large boundary, we
can save a couple of KB worth of alignment padding by placing the
exception vectors at the same address.

Deciding which one it is is easy: If we're handling an exception, the
CPU is in Exception mode. If we're starting up after reset, the CPU is
in Supervisor mode. So this adds a very minimal overhead to the reset
path (only executed once) and the exception handling path (normally
never executed at all.)

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

All C code is compiled with -ffunction-sections -fdata-sections.
Assembly functions should get their own sections as well so that
everything looks consistent.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

pm_init() was always more about clock initialization than anything
else. Dealing with PLLs, clock gating and such is also inherently
SoC-specific, so move it into a SoC-specific directory.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

This makes it easier to avoid compiling certain files later.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

Rework the HMATRIX configuration interface so that it becomes easier
to configure the HMATRIX for boards with special needs, and add new
parts.

The HMATRIX header file has been split into a general,
chip-independent part with register definitions, etc. and a
chip-specific part with SFR bitfield definitions and master/slave
identifiers.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>