Commit graph

15170 commits

Author SHA1 Message Date
Harinarayan Bhatta
57de1ea5be arm: omap5: Add TEE loading support
secure_tee_install is used to install and initialize a secure TEE OS such as
Linaro OP-TEE into the secure world. This function takes in the address
where the signed TEE image is loaded as an argument. The signed TEE image
consists of a header (struct tee_header), TEE code+data followed by the
signature generated using image signing tool from TI security development
package (SECDEV). Refer to README.ti-secure for more information.

This function uses 2 new secure APIs.

1. PPA_SERV_HAL_TEE_LOAD_MASTER - Must be called on CPU Core 0. Protected
   memory for TEE must be reserved before calling this function. This API
   needs arguments filled into struct ppa_tee_load_info. The TEE image is
   authenticated and if there are no errors, the control passes to the TEE
   entry point.

2. PPA_SERV_HAL_TEE_LOAD_SLAVE - Called on other CPU cores only after
   a TEE_LOAD_MASTER call. Takes no arguments. Checks if TEE was
   successfully loaded (on core 0) and transfers control to the same TEE
   entry point.

The code at TEE entry point is expected perform OS initialization steps
and return back to non-secure world (U-Boot).

Signed-off-by: Harinarayan Bhatta <harinarayan@ti.com>
Signed-off-by: Andrew F. Davis <afd@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2016-12-03 13:21:21 -05:00
Andrew F. Davis
7e719ee7d8 image: Add Trusted Execution Environment image type
Add a new image type representing Trusted Execution Environment (TEE)
image types. For example, an OP-TEE OS binary image.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2016-12-03 13:21:20 -05:00
Andrew F. Davis
d7be50921e image: Add FIT image loadable section custom processing
To help automate the loading of custom image types we add the ability
to define custom handlers for the loadable section types. When we find
a compatible type while loading a "loadable" image from a FIT image we
run its associated handlers to perform any additional steps needed for
loading this image.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2016-12-03 13:21:19 -05:00
Fabien Parent
5ca28f67ac davinci: omapl138_lcdk: add DT support for EMMC boot
When booting from EMMC, load the DTB and pass it to the kernel.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2016-12-03 13:21:19 -05:00
Fabien Parent
f96ab6a48a davinci: omapl138_lcdk: improve readability of boot command
Improve the readability of the boot command. This will help a later
commit that adds DT support.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2016-12-03 13:21:18 -05:00
Fabien Parent
c69a05d0b9 davinci: omapl138_lcdk: add NAND SPL boot support
NAND SPL boot was missing. Add it. The README specific to omapl138-lcdk
is also removed because its content does not apply anymore, i.e. the
generated AIS image can be flashed directly to the NAND without
using any external tool to create and bootable AIS image.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2016-12-03 13:21:18 -05:00
Fabien Parent
b2b3365a1c davinci: omapl138_lck: remove obsolete define
NAND_MAX_CHIPS is not used anymore and has been replaced by
CONFIG_SYS_MAX_NAND_DEVICE. There is no need to keep the former
define.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2016-12-03 13:21:17 -05:00
Fabien Parent
ef04479627 davinci: omapl138_lcdk: use correct name for CONFIG_SYS_NAND_MASK_ALE
CONFIG_SYS_ALE_MASK is not used anywhere. It has probably been
renamed to CONFIG_SYS_NAND_MASK_ALE. Rename it and remove the former
from the config_whitelist.txt file.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2016-12-03 13:21:17 -05:00
Fabien Parent
1dbab2745a davinci: omapl138_lcdk: use correct name for CONFIG_SYS_NAND_MASK_CLE
CONFIG_SYS_CLE_MASK is not used anywhere. It has probably been
renamed to CONFIG_SYS_NAND_MASK_CLE. Rename it and remove the former
from the config_whitelist.txt file.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2016-12-03 13:21:16 -05:00
Fabien Parent
d92ca46e72 davinci: omapl138_lcdk: use correct define for 16 bit NAND chips
The omapl138_lcdk header defines CONFIG_SYS_NAND_BUSWIDTH_16_BIT while
the correct name is CONFIG_SYS_NAND_BUSWIDTH_16BIT.
While renaming the only occurrence of CONFIG_SYS_NAND_BUSWIDTH_16_BIT,
let's also remove it from the config_whitelist.txt file.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2016-12-03 13:21:16 -05:00
Fabien Parent
a5ab44f69b davinci: omapl138_lcdk: configure ddr2
The SPL is unable to load u-boot because the DDR2 is not configured.
Configure the DDR2.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2016-12-03 13:21:14 -05:00
Fabien Parent
b31bf37a38 ARM: davinci: Move CONFIG_SYS_DA850_DDR_INIT to Kconfig
Clean config headers by moving CONFIG_SYS_DA850_DDR_INIT away to a
Kconfig file.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2016-12-03 13:21:12 -05:00
Fabien Parent
f519b36491 ARM: davinci: Move CONFIG_SYS_DA850_PLL_INIT to Kconfig
Clean config headers by moving CONFIG_SYS_DA850_PLL_INIT away to a
Kconfig file.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2016-12-03 13:21:12 -05:00
Nishanth Menon
3891a54f47 ARM: DRA7x/AM57xx: Get rid of CONFIG_AM57XX
CONFIG_AM57XX is just an unnecessary macro that is redundant given So,
remove the same instead of spreading through out the u-boot source
code and getting in the way to maintain common code for DRA7x family.

Acked-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2016-12-03 13:21:11 -05:00
Nishanth Menon
042fdb7cab usb: xhci: Remove assumption of DWC instance based on DRA7 SoC type
Both AM57xx and DRA7xx share the same set of base addresses for DWC
controllers. The usage however differ with DWC2 instance used typically
in AM57xx evms while DWC1 instances used in DRA7x platforms.

Use TARGET_SOC config to differentiate so that CONFIG_AM57XX can be dropped.

Eventually, this needs to be dt-fied.

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2016-12-03 13:21:10 -05:00
Lokesh Vutla
1e93cc8473 ti_armv7_common: env: Add support for loading FIT images
FIT is a new image format which is a Tree like structure and gives more
flexibility in handling of various images. Mainly used for unification of
multiple images in a single blob and provide security information for each
image.

U-Boot already has support for loading such images, so adding the environment
support to load FIT image on all TI platforms.

Reviewed-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2016-12-03 13:21:08 -05:00
Lokesh Vutla
2a77788439 ti_armv7_common: env: Consolidate support for loading images from mmc
Support for loading images from mmc is duplicated in all TI platforms.
Add this information to DEFAULT_MMC_TI_ARGS so that it can be reused
in all TI platforms.

Reviewed-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2016-12-03 13:21:07 -05:00
Vladimir Zapolskiy
47c5705d82 r2dplus: fixup CONFIG_SYS_TEXT_BASE to account arch/sh changes
This change allows to reserve enough space at the end of board SDRAM
to store two copies of U-Boot and malloc heap.

Due to selection of the CONFIG_SYS_TEXT_BASE the second code/data
copying is not avoided, first of all this may depend on a used
toolchain, secondly at this point some level of volatility is wanted
to do more platform changes and do not care about probably changed
calculated in runtime relocation offset.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
2016-12-02 21:32:54 -05:00
Vladimir Zapolskiy
18a40e8470 sh: define CONFIG_DISPLAY_BOARDINFO to print board information
All SH boards define a checkboard() function which outputs basic board
information on boot, however generic board support requires to define
CONFIG_DISPLAY_BOARDINFO to do that, so define it for the boards.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2016-12-02 21:32:49 -05:00
Vladimir Zapolskiy
9079acba9f sh: remove undefined DEBUG preprocessor token from board config files
By default this undef is a noop, moreover at this point when the
platform support is broken is prevents debugging of U-boot by manual
insertion of #define DEBUG into common files, so it makes sense to
remove the option from all SH boards as a harmful one.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2016-12-02 21:32:49 -05:00
Vladimir Zapolskiy
3f8b5391ec sh4: use single u-boot linker script for all boards
Three supported SH4/SH4A boards with the bootloader image stored on
SPI flash have own flavour of a linker script, in turn they are equal
among each other. The only difference is that the text from
lowlevel_init.o is placed right after start.o, which makes sense.

Note that .bss section is not marked as NOLOAD, because for about
10 years this is a default option of a GNU linker, either the
attribute is found or not the resulting image file is the same.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2016-12-02 21:32:46 -05:00
Vladimir Zapolskiy
7652704722 r2dplus: use P1 area space for text base and PCI system memory
While both options are acceptable use P1 area physical addresses
instead of external memory space of text base and PCI system memory
for unification purposes, all other supported superh boards have the
same selection.

This allows to easily ensure that CONFIG_SYS_TEXT_BASE is located
within available DRAM.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2016-12-02 21:32:45 -05:00
Vladimir Zapolskiy
b032eb1f71 sh4: remove __io config options from r2dplus and r7780mp boards
Defined __io is no-op for the SH architecture and it can be removed
from board files without any functional change.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2016-12-02 21:32:44 -05:00
Jonathan Gray
fd184b9c80 compiler.h: use u-boot endian macros on OpenBSD
When building u-boot on sparc64 and powerpc hosts it became clear that
u-boot expects endian conversion defines to be macros:

lib/crc32.c:87: error: braced-group within expression allowed only inside a function

For OpenBSD switch from using system definitions equivalent to the u-boot ones
and define glibc __BYTE_ORDER __BIG_ENDIAN __LITTLE_ENDIAN names, as at least
some parts of the non-cross build assumes those names are present (ie crc32.c).

Signed-off-by: Jonathan Gray <jsg@jsg.id.au>
2016-12-02 21:32:38 -05:00
Sekhar Nori
7e0b87c91a ARM: am57xx_evm: enable DFU support
AM57xx GP EVM has USB2 port of the SoC exposed as
USB client port.

It is useful to be able to use this port for USB
DFU downloads.

Enable USB DFU support. Tested on AM57x GP EVM Rev
A3 using DFU to download to connected SD card.

configs for HS version of the AM57x EVM are
included in the patch but not really tested.

Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2016-12-02 21:32:37 -05:00
Sekhar Nori
f843770a6a ARM: ti: consolidate dfu environment variables
Introduce include/environment/ti/dfu.h that
consolidates environment variable definitions
for various TI boards that support DFU today.

Tested on AM335x EVM, AM437x SK EVM and DRA74x
EVM by using DFU to write to SD card.

Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2016-12-02 21:32:37 -05:00
Michal Simek
c002e39ae6 scsi: Change scsi_scan() to be able to return value
With DM_SCSI this function will return more than one return value to
cover errors.

Suggested-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2016-12-02 14:37:26 +01:00
Michal Simek
182ec15307 scsi: Remove completely unused functions
These functions are not called for any location.
This patch removes them scsi_trim_trail(), scsi_get_disk_count()
and scsi_setup_read6().

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2016-12-02 14:37:26 +01:00
Masahiro Yamada
e3e18bea64 ARM: zynq(mp): remove unneeded CONFIG_USB_MAX_CONTROLLER_COUNT defines
ARCH_ZYNQ(MP) selects DM_USB, where CONFIG_USB_MAX_CONTROLLER_COUNT
is not used.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Moritz Fischer <moritz.fischer@ettus.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2016-12-02 14:36:01 +01:00
Marek Vasut
09410c6572 SPL: mmc: Make spl_mmc_load_image available
Make the spl_mmc_load_image() available globally, so it can be
invoked directly by SPL on extremely space-constrained systems.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Tom Rini <trini@konsulko.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
2016-12-01 14:06:41 +09:00
Marek Vasut
b5b838f1a7 mmc: Tinification of the mmc code
Add new configuration option CONFIG_MMC_TINY which strips away all
memory allocation within the MMC code and code for handling multiple
cards. This allows extremely space-constrained SPL code use the MMC
framework.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Tom Rini <trini@konsulko.com>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
2016-12-01 13:51:57 +09:00
Tomas Melin
cd3d48807d mmc: add bkops-enable command
Add new command that provides possibility to enable the
background operations handshake functionality
(BKOPS_EN, EXT_CSD byte [163]) on eMMC devices.

This is an optional feature of eMMCs, the setting is write-once.
The command must be explicitly taken into use with
CONFIG_CMD_BKOPS_ENABLE.

Signed-off-by: Tomas Melin <tomas.melin@vaisala.com>
2016-12-01 11:09:44 +09:00
Tom Rini
4d6647ab17 Merge branch 'master' of git://www.denx.de/git/u-boot-imx 2016-11-30 09:57:52 -05:00
Christoph Fritz
730d25443a mx6sx: Add initial support for Samtec VIN|ING 2000 board
This patch adds initial support for Samtec VIN|ING 2000 board.

Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
Reviewed-by: Stefano Babic <sbabic@denx.de>
Acked-by: Marek Vasut <marex@denx.de>
2016-11-30 09:54:42 +01:00
Tom Rini
6b29a395b6 Merge git://git.denx.de/u-boot-mpc85xx 2016-11-29 19:42:48 -05:00
Angus Ainslie
9cd37b02a0 imx7: SPI: add suport for SPI flash in mikroBUS slot
Enable the escpi3 nets attached to the mikroBUS slot
on the i.MX7 Sabre evalution board. Also enble the SPI flash
commands to work with the "flash click" board.

This is V2 of this patch with changes recommended by the maintainer

CC: Jagan Teki <jteki@openedev.com>
2016-11-29 17:00:31 +01:00
Stefan Agner
0405092bd2 arm: mx6: specify SPL padding
Specify standard padding for payload to 68KB. This is derived from
the maximum header size plus maximum SPL size. It matches the
already defined offset for SD/eMMC devices (69KB) too. This allows
to use the u-boot-with-spl.imx build target to generate a directly
flashable image which can be flashed using:

  dd if=u-boot-with-spl.imx of=/dev/mmcblk0 bs=512 skip=2

While the patch has been created with SD/eMMC in mind, this also
works with other boot media. The board file needs to configure the
media specific (absolute) payload offset accordingly. Especially
the IVT offset is boot media specific and can be retrieved from the
reference manual (Table 8-25. Image Vector Table Offset and Initial
Load Region Size). For NAND boot a define like this should do the
job:

 #define CONFIG_SYS_NAND_U_BOOT_OFFS (SPL_PAD_TO + 0x400)

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
2016-11-29 16:59:37 +01:00
Breno Lima
792f186846 mx6sx: Add initial support for UDOO Neo Board
UDOO Neo Board is a development board from Seco that has three models:
 - UDOO Neo Basic
 - UDOO Neo Basic Kick Starter
 - UDOO Neo Extended
 - UDOO Neo Full

All versions are based on the i.MX6 SoloX processor.

For more details about the UDOO Neo board, please refer to:
http://www.udoo.org/udoo-neo/

This work is based on a previous commit of Francesco Montefoschi
<francesco.monte@gmail.com>:
877b71184a

Only tested on the UDOO Neo Full board.

Signed-off-by: Breno Lima <breno.lima@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
2016-11-29 16:48:20 +01:00
Sanchayan Maity
3ed82d6f9b colibri_vf: Read kernel and device tree from static UBI volumes
Our update scripts write the kernel and device tree in seperate
UBI volumes. This allows to use a lot less UBI/UBIFS support in
U-Boot, which should lower the risk of hitting bugs in this area.

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>
2016-11-29 16:47:47 +01:00
Sebastien Bourdelin
d9e268ed76 ARM: ts4600: add basic board support
This commit adds basic support including:
MMC, Serial console

Signed-off-by: Sebastien Bourdelin <sebastien.bourdelin@savoirfairelinux.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
2016-11-29 16:45:48 +01:00
Sven Ebenfeld
36c0627ba5 arm: imx: wandboard: fix compile error if CONFIG_VIDEO is deactivated
When I tried to deactivate VIDEO support for the Wandboard, it still
tried to initialize the Framebuffer and so on. That is the reason for
the added ifdefs. CONFIG_VIDEO is enabled in the configuration as default
and therefore nothing changes for the default user.

The structs mx6dl_i2c2_pad_info and mx6q_i2c2_pad_info are only available
when CONFIG_IPUV3 are set and should not be tried to access, when that
define is not defined.

Signed-off-by: Sven Ebenfeld <sven.ebenfeld@gmail.com>
2016-11-29 16:34:56 +01:00
Stefano Babic
2d221489df Merge branch 'master' of git://git.denx.de/u-boot
Signed-off-by: Stefano Babic <sbabic@denx.de>
2016-11-29 16:28:28 +01:00
Alexander Graf
8b82dd9add bcm2835 video: Map frame buffer as 32bpp
To enable working efifb support, let's map the frame buffer as 32bpp
instead of 16bpp.

Signed-off-by: Alexander Graf <agraf@suse.de>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
2016-11-28 20:15:20 -05:00
Fabian Vogt
d8396a3272 board: rpi: move uart deactivation to board_init
When using OF_CONTROL, the disabled value of the mini UART platdata
gets reset after board_early_init_f. So move detection and disabling
to board_init and remove board_early_init_f.
This uses the first device using the mini uart driver, as this method
works reliably with different device trees or even no device tree at all.

Signed-off-by: Fabian Vogt <fvogt@suse.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2016-11-28 20:09:51 -05:00
Fabian Vogt
715dad6d7e fdt: add dt-bindings for bcm2835
This patch adds dt-bindings as used by the linux kernel device trees
for the bcm283x family.

Albert Aribaud <albert.u.boot@aribaud.net>
Signed-off-by: Fabian Vogt <fvogt@suse.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2016-11-28 20:09:48 -05:00
Tien Fong Chee
7aa1a6b71c fs/fat/fatwrite: Local variable as buffer to store dir_slot entries
fill_dir_slot use get_contents_vfatname_block as a temporary buffer for
constructing a list of dir_slot entries. To save the memory and providing
correct type of memory for above usage, a local buffer with accurate size
declaration is introduced.

The local array size 640 is used because for long file name entry,
each entry use 32 bytes, one entry can store up to 13 characters.
The maximum number of entry possible is 20. So, total size is
32*20=640bytes.

Signed-off-by: Genevieve Chan <ccheauya@altera.com>
Signed-off-by: Tien Fong Chee <tfchee@altera.com>
2016-11-28 20:09:45 -05:00
Stefan Agner
5991703e88 spl: dfu: move DFU Kconfig to SPL Kconfig
The DFU Kconfig menu entries should be part of the SPL
Kconfig file. Also avoid using the top level Makefile by
moving the config dependent build artifacts to the driver/
and driver/usb/gadget/ Makfiles.

With that, DFU can be built again in SPL if
CONFIG_SPL_DFU_SUPPORT is enabled.

Fixes: 6ad6102246 ("usb:gadget: Disallow DFU in SPL for now")

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Lukasz Majewski <l.majewski@samsung.com>
2016-11-28 19:49:49 -05:00
Andrew F. Davis
979a1f8b21 ti_armv7_keystone2: env: Add NFS loading support for PMMC and MON
NFS loading support has been added to the default environment for
most boot components, as PMMC and MON loading were added later they
did not originally get the NFS commands added, add these now.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
2016-11-28 15:10:35 -05:00
Andrew F. Davis
ac34286647 keystone2: Move target selection to Kconfig
The config option TARGET_K2x_EVM is set by the k2x defconfigs to pick
a board target, but the header configs also set K2x_EVM. This config
is redundant, remove it and use TARGET_K2x_EVM everywhere in its place.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
2016-11-28 15:10:34 -05:00
mario.six@gdsys.cc
ca388143ce linux/compat.h: Properly implement ndelay fallback
Commit c68c62 ("i2c: mvtwsi: Make delay times frequency-dependent")
extensively used the ndelay function with a calculated parameter
which is dependant on the configured frequency of the I2C bus. If
standard speed is employed, the parameter is usually 10000 (10000ns
period length for 100kHz frequency).

But, since the arm architecture does not implement a proper version of
ndelay, the fallback default from include/linux/compat.h is used,
which defines every ndelay as udelay(1). This causes problems for
slower speeds on arm, since the delay time is now 9us too short for
the desired frequency, which leads to random failures of the I2C
interface.

To remedy this, we implement a proper, parameter-aware ndelay fallback
for architectures that don't implement a real ndelay function.

Reported-By: Jason Brown <Jason.brown@apcon.com>
To: Tom Rini <trini@konsulko.com>
To: Heiko Schocher <hs@denx.de>
Signed-off-by: Mario Six <mario.six@gdsys.cc>
2016-11-28 15:10:34 -05:00