The sht21 temperature and humidity sensor holds the i2c bus while
an ADC conversion is in progress. For example, a temperature
measurement is requested, a read operation is started, and the
sht21 doesn't respond to the read request until the result of
the measurement is ready. The conversion time isn't constant.
On rare occations (one in hundreds of samples) the timeout in the
i2c driver expires returning an error.
The example code from Sensirion, the sht21's manufacturer, suggests
a bus timeout of 1 second to accommodate the sht21. This commit
increases the bus timeout to 1 second. The timeout is only reached
when chips do not respond normally, so the change doesn't affect the
performance of any other drivers.
Change-Id: I57b0f958a5d0b69b221af380b771fe67401ff604
Many i2c device drivers used similar code to access registers on
the ICs they drive. This commit implements that functionality in
libi2cdriver and updates the drivers to use the library instead of
their own register access functions. The net result is 375+ fewer
lines of code and less work for people developing new drivers.
The two exceptions were cat24c256 and parts of tda19988. They access
the bus in uncommon ways. It doesn't make sense at this time to
move their read/write functions into libi2cdriver.
Change-Id: Id8280b71af33b710a49944d7f20a7262be9f5988
A copy and paste error caused a few lines of code to be duplicated.
This patch removes the excess code.
Change-Id: I7313efb537e2a4102fb25ce05782e82ae0c84285
To provide EDID to fb, the TDA19988 implements the block device
protocol with libblockdriver. To properly use the library,
blockdriver_announce() should be called by the driver.
Issue reported by David van Moolenbroek
Change-Id: Id55d159d91502a9afac5c1d4de0fee1e8945b5c1
According to the virtio specifications, the host present the supported
features to the guest, and the guest should answer woth the features it
supports. This allows the host to disable support for features that the
guest is not going to use.
Minix tells to the host it doesn't support any extended features, while
it uses at least VIRTIO_NET_F_MAC and VIRTIO_NET_F_CTRL_VQ. For the
latter it seems it only allocate the queue while not using it later.
However starting with QEMU 1.4.0, with multiqueue support added, the
control queue is not allocated on the host side if the guest doesn't
tell it supports this feature. This cause virtio-net to crash on the
Minix side.
This patch fixes that by correctly telling the features that are
used by the Minix guest for more than printing a debug message. This
fixes virtio-net on QEMU 1.4.x.
Change-Id: I8bbf757c09d24e0f5fe5835531a1c9203b714bd7
* port libgpio to am335x.
* increase NR_IRQ to 16 to avoid too many IRQs requested error.
* move gpio binary to /sbin (that's where mount looks for drivers).
* fix bug that re-enabled banks that were disabled due to bad revision.
* fix padconf masks for dm37xx in gpio driver (should be 16-bit).
* fix a few typos in README.txt and comments.
Change-Id: I32374415a97135174c5224f76374a870909fa90c
On the AM335X, writes to the padconf registers must be done in privileged
mode. To allow userspace drivers to dynamically change the padconf at
runtime, a kernel call has been added.
Change-Id: I4b25d2879399b1785a360912faa0e90b5c258533
for clang, fix warnings in drivers/, lib/, servers/, sys/, common/.
by turning off fatal warnings (takes effect if the default is on),
fixing warnings or reducing the warning level.
Change-Id: Ia1b4bc877c879ba783158081b59aa6ebb021a50f
. added enable interrupts routine at the HW init stage
. remove workaround, obsoleted by libnetdriver change
. change netconf.sh to allow configuring this driver,
changed README.txt to reflect this
Change-Id: Ib659d5a55be96022b5e9013caa556dca5092ce89
Implement changes based on Kees comments on the code review:
http://gerrit-minix.few.vu.nl/#/c/676/
Changes:
- use spin API instead of micro_delay() for busy-wait loops.
- use read16/write16/set16 from mmio.h to access I2C registers.
- reduce the timeout for soft reset.
- in read/write, don't mix variable declaration and initialization.
- after transfer, wait for access ready instead of blindly delaying.
- rename constants am335x, dm37xx to AM335X_I2C_BUS, DM37XX_I2C_BUS.
- rename ADDRESS_MASK to MAX_I2C_SA_MASK for clairity.
- rename omap_i2c_claim_bus() to omap_i2c_bus_is_free().
Change-Id: Ic221e6134e024ea0a6690f21cff208a728286948
Use EDID when available to configure the frame buffer driver with
good settings for the attached display.
Change-Id: I69a78155a93e55ffa1ca3ff6621a879a56cdbceb
readclock:
- the setup function for readclock on i386 was missing a return.
- the message field for RTCDEV_GRANT wasn't the right type.
tda19988:
- position variable was used without being initialized.
Change-Id: I3f78dd0a9d44f35eb38cb7da0974909f066b7007
On the BeagleBoard-xM, the RTC is located on the Power Management IC
(PMIC). To keep things consistent, access to the PMIC's RTC is done
through the readclock driver. The readclock driver forwards the request
on to the TPS65950 driver which does the work of manipulating the
registers on the chip.
Change-Id: I53cefbb59c5a9ab87fab90df3cc1a75a6e430f58
. Replace 64bit funcions with operators in arch_clock.c
. Replace 64bit funcions with operators in proc.c
. Replace 64bit funcions with operators in vbox.c
. Replace 64bit funcions with operators in driver.c
. Eradicates is_zero64, make_zero64, neg64
Change-Id: Ie4e1242a73534f114725271b2e2365b2004cb7b9
Add support for getting/setting the am335x SoC's internal real
time clock. Also, allow the power off alarm to be set.
Make readclock an "always on" driver. This is needed for setting
power-off alarms whenever the power button is pressed on the BBB.
Replace the readclock.sh script & single run driver with a
readclock program that takes the same arguments and forwards
the requests on to the always up readclock driver.
Change-Id: Ifd6c2acd80ae4b5e79d83df510df445c24e24a71
128 byte reads are much more common than 32 byte reads. The message
passing + setup/teardown for a read is much more expensive, in terms
of time, than the reading itself. A slightly bigger struct is well
worth the time savings. This reduces read times for /dev/eeprom
from 57 seconds per 4KB to 14 seconds.
Additionally, make sending the page address in the eeprom driver
and utility optional. This can save a little time when reading
within the same page and allows support for smaller devices that
don't support pages (example: chips containing EDID).
Change-Id: Ie48087caee40c11fa241d1555fce9309ddd27b43
This reverts commit 85e7d849c8.
This introduce a bug in position computing for disk bigger than 4GB.
Change-Id: I281e60e9644d995cc4643006b50c05693f939b44
When we send MMC commads that contain data the controller provides no
description of the order of events and we need to be able to send data
from and to the controller "when needed". Changed the code to react
on buffer read and buffer write ready based on interrupts.
Change-Id: I60c9140bf0e45b74be6475054564d4e1bd89f21e
Generalize the usage of mmc_send_cmd function to allow
it to transfer data and remove direct invocations to
mmchs_send_cmd.
Change-Id: Iabb9a7d3f4ec57536407b369531ded2b8b649cce
Clock configuration will be needed by other/future subsystems such as i2c.
Extract the functionality from libgpio and put it into it's own library.
Change-Id: I6f6de0b3fb4d305ddfeac74123b78c983d1318dd
. always keep reading data from uart so the interrupt is
not continually asserted if data is sent but no process
reads it
. increase tx & rx fifo trigger levels -> reduces the number
of interrupts necessary
. bigger rx/tx buffers
Change-Id: I3cf7c73b22ae2fc091b845d516ba4aa53e892cda
. ignore interrupt (stop interrupt check loop) if
interrupt bit not set; limit loop too
. mask off other bits when testing bits in the status register
. this fixes rs232 output that would otherwise never get re-triggered
as too many bits were set in the status byte to match the
possibilities.
Change-Id: I311c93377fa8fb477ee9a756455fdeda780e6ba1
