Commit graph

9 commits

Author SHA1 Message Date
Michael LeMay 4181179985 galileo: Add support for Gen. 1 pinmux and GPIO
This patch adds support for IO pinmuxing and GPIO on first generation
Intel Galileo boards.
2016-08-23 13:02:39 -07:00
Michael LeMay b17a936bf7 galileo: Add board-level abstraction layer for GPIO
This patch adds a HAL for GPIOs so that users of the API can specify
board-level IO pin numbers rather than CPU-level pin numbers.
2016-08-23 13:02:36 -07:00
Michael LeMay 2912559061 galileo: Revise pinmux API to be more intuitive
This patch replaces the pinmux APIs that require users to look up an arbitrary
function number for the desired function of each pin.  The replacement API
functions have intuitive names and permit users to pass board-level IO port
numbers.  The API functions internally convert those to CPU-level port numbers
when necessary.  Furthermore, when configuring a pin to be a digital input or
output, those API functions also perform the corresponding configuration
operation on the CPU-level GPIO port.  The revised APIs halt when users attempt
to configure a currently-unsupported GPIO, specifically those in the GPIO_SUS
port range and those implemented on the expander chip EXP2.  This also means
that such ports are left unconfigured during initialization, whereas the
pinmuxing for them was setup by the old implementation.
2016-08-23 13:02:32 -07:00
Michael LeMay 3043f3956c galileo: Simplify pinmux configuration
This patch refactors the pinmux configuration code for Intel Galileo to simplify
it. This patch also corrects an off-by-one error in how the pin number is
checked in galileo_pinmux_set_pin.
2016-08-23 12:39:21 -07:00
Michael LeMay 58874ea25d x86, galileo: Refactor I2C and GPIO initialization
This patch revises the I2C and GPIO initialization code to always be
run during platform boot rather than within each process that requires
it.

This patch also revises the gpio-output example to use a pin that is
set as an output by the default pinmux configuration.  Previously, it
used a pin that was set as an output by the pinmux configuration that
is in effect when the OS does not change the pinmux configuration.
2016-02-16 21:19:44 -08:00
Michael LeMay 13be942d40 galileo: Fix code style violations 2015-12-21 08:06:14 -02:00
Ricardo de Almeida Gonzaga 93c7988069 x86: Add Galileo pinmux support
This patch adds the galileo-pinmux.c and galileo-pinmux.h files,
which support access to pinmux configuration through a function
interface.

This is not 100% supported yet due to some pinmux paths
need Quark X1000 GPIO (legacy and non-legacy) configurations.

After we finish to implement Quark X1000 GPIO driver we'll add
support for this.
2015-12-21 08:06:14 -02:00
Ricardo de Almeida Gonzaga 781375f1d1 x86: Add PCA9685 support
This patch adds pwm-pca9685.c and pwm-pca9685.h files,
which support access to I2C-based PCA9685 PWM controller
configuration register through a function interface.

The PCA9685 is an I2C-bus controlled 16-channel LED controller
optimized for Red/Green/Blue/Amber (RGBA) color backlighting
applications. Each LED output has its own 12-bit resolution
(4096 steps) fixed frequency individual PWM controller that
operates at a programmable frequency from a typical of 24 Hz to
1526 Hz with a duty cycle that is adjustable from 0 % to 100 %
to allow the LED to be set to a specific brightness value.
More about PCA9685 can be found in its datasheet[1].

This driver is needed in order to configure Galileo pinmux.

[1] - http://www.nxp.com/documents/data_sheet/PCA9685.pdf
2015-12-21 08:06:14 -02:00
Ricardo de Almeida Gonzaga 495dcd659a x86: Add PCAL9535A support
This patch adds gpio-pcal9535a.c and gpio-pcal9535a.h files,
which support access to I2C-based PCAL9535A GPIO controller
configuration register through a function interface.

The PCAL9535A is a low-voltage 16-bit GPIO expander with interrupt
and reset for I2C-bus/SMBus applications. It contains the PCA9535
register set of four pairs of 8-bit Configuration, Input, Output,
and Polarity Inversion registers, and additionally, the PCAL9535A has
Agile I/O, which are additional features specifically designed to
enhance the I/O. More about PCAL9535A can be found in its datasheet[1].

This driver is needed in order to configure Galileo pinmux.

[1] - http://www.nxp.com/documents/data_sheet/PCAL9535A.pdf
2015-12-21 08:06:14 -02:00