Commit Graph

31 Commits

Author SHA1 Message Date
pfg
1537078d8f sys/dev: further adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-27 14:52:40 +00:00
andrew
d9148c6347 Stop including a possibly GPLd header from the GPIO code. Add the only
needed macro to ofw_gpiobus.c.

Reported by:	emaste
Sponsored by:	DARPA, AFRL
2016-10-26 12:41:44 +00:00
adrian
713f69d255 [gpio] include intr.h when building with INTRNG.
Trying to build a MIPS platform that uses INTRNG needs this
for this to work right in gpiobusvar.h :

#ifdef INTRNG
struct intr_map_data_gpio {
        struct intr_map_data    hdr;
...
};
#endif
2016-09-09 04:54:41 +00:00
mmel
28257ccca8 INTRNG: Rework handling with resources. Partially revert r301453.
- Read interrupt properties at bus enumeration time and store
   it into global mapping table.
 - At bus_activate_resource() time, given mapping entry is resolved and
   connected to real interrupt source. A copy of mapping entry is attached
   to given resource.
 - At bus_setup_intr() time, mapping entry stored in resource is used
   for delivery of requested interrupt configuration.
 - For MSI/MSIX interrupts, mapping entry is created within
   pci_alloc_msi()/pci_alloc_msix() call.
 - For legacy PCI interrupts, mapping entry must be created within
   pcib_route_interrupt() by pcib driver itself.

Reviewed by: nwhitehorn, andrew
Differential Revision: https://reviews.freebsd.org/D7493
2016-08-19 10:52:39 +00:00
mmel
f66cc0d4f8 INTRNG: As follow up of r301451, implement mapping and configuration
of gpio pin interrupts by new way.

Note: This removes last consumer of intr_ddata machinery and we remove it
in separate commit.
2016-06-07 05:08:24 +00:00
ian
3cba38f109 Don't wrap the declaration of gpio_alloc_intr_resource() in #ifdef INTRNG,
wrap the implementation so that it returns an error if INTRNG support is
not available.  It should be possible to write a non-INTRNG implementation
of this function some day.  In the meantime, there is code that contains
calls to this function (so the decl is needed), but have runtime checks to
avoid calling it in the non-INTRNG case.
2016-05-27 20:41:25 +00:00
ian
d2d471b50a Add a convenience function to get a gpio pin's capabilties. 2016-05-26 22:35:52 +00:00
ian
59d1116142 Rename gpiobus_map_pin() to gpiobus_acquire_pin(), to better reflect the
fact that the caller is requesting exclusive use of the pin, and also to
better match the inverse operation which is named gpiobus_release_pin().
2016-05-26 15:45:36 +00:00
gonzo
44e06ff11e Add gpiobus_release_pin function to release mapped pin
Add gpiobus_release_pin as a counterpart for gpiobus_map_pin. Without it
it's impossible to properly release pin so if kernel module is reloaded
it can't re-use pins again
2016-05-12 20:12:45 +00:00
gonzo
b05aea41fa Pass device tree node as a part of gpio_pin_get_by_ofw_XXX API
Current API assumes that "gpios" property belongs to the device's node but for
some binding it's not true: gpiokeys has set of child nodes with this property.

Patch adds new argument instead of replacing device_t because device_t will be
used to track ownership for allocated pins

Reviewed by:	mmel
Differential Revision:	https://reviews.freebsd.org/D6277
2016-05-10 20:02:03 +00:00
mmel
1e1149563f GPIO: Add support for gpio pin interrupts.
Add new function gpio_alloc_intr_resource(), which allows an allocation
of interrupt resource associated to given gpio pin. It also allows to
specify interrupt configuration.

Note: This functionality is dependent on INTRNG, and must be
implemented in each GPIO controller.
2016-04-28 12:03:22 +00:00
mmel
ba6f296a4e OFW_GPIOBUS: Add utility functions for easier handling of OFW GPIO pins.
Reviewed by: ian, loos (paritaly)
2016-03-01 16:10:15 +00:00
loos
04b6b93c32 Add a new ioctl to allow the setting of GPIO pin names.
When a gpiobus child is added, use its name to identify the mapped pin
names.

Make the respective changes to libgpio.

Add a new '-n' flag to gpioctl(8) to set the pin name.

Differential Revision:	https://reviews.freebsd.org/D2002
Reviewed by:	rpaulo
Requested by:	many
2015-03-08 00:47:50 +00:00
loos
80210b69e0 Use the child device name here is lame because at the point that this
happens, the child device is not yet specified.
2015-03-05 03:11:47 +00:00
loos
4a1b04f61d Move duplicate code to a new public function.
This new function can be used by other drivers to reserve the use of GPIO
pins.

Anyway, the use of ofw_gpiobus_parse_gpios() is preferred when possible.

Requested by:	Michal Meloun
2015-03-02 22:28:47 +00:00
loos
5f4e308fdd Add ofw_gpiobus_parse_gpios(), a new public function, to parse the gpios
property for devices that doesn't descend directly from gpiobus.

The parser supports multiple pins, different GPIO controllers and can use
arbitrary names for the property (to match the many linux variants:
cd-gpios, power-gpios, wp-gpios, etc.).

Pass the driver name on ofw_gpiobus_add_fdt_child().  Update gpioled to
match.

An usage example of ofw_gpiobus_parse_gpios() will follow soon.
2015-02-28 21:01:01 +00:00
loos
90a2c451d7 Rename and move gpiobus_alloc_ivars() and gpiobus_free_ivars() so they can
be used on non FDT systems.

This prevents access to uninitialized memory on drivers that try to access
pin flags on non FDT systems.
2015-02-28 20:02:41 +00:00
loos
53c44a5b68 Register the GPIO controller device reference on xref table for FDT systems. 2015-02-02 19:22:34 +00:00
loos
5e1a593992 Implement GPIO_GET_BUS() method for all GPIO drivers.
Add helper routines to deal with attach and detach of gpiobus and gpioc
devices that are common to all drivers.
2015-01-31 19:32:14 +00:00
loos
9ad347c496 Moves all the duplicate code to a single function.
Verify for invalid modes and unwanted flags before pass the new flags to
driver.
2014-11-18 17:22:08 +00:00
loos
df456d7866 Fix gpiobus_child_location_str() to return a real string with the mapped
pins.

Make gpiobus_print_pins() static again.
2014-11-18 02:41:35 +00:00
loos
f6e40bf835 Add basic interrupt management code to gpiobus and ofw_gpiobus.
This is the general support to allow the use of GPIO pins as interrupt
sources for direct gpiobus children.

The use of GPIO pins as generic interrupt sources (for an ethernet driver
for example) will only be possible when arm/intrng is complete.  Then, most
of this code will need to be rewritten, but it works for now, is better
than what we have and will allow further developments.

Tested on:	ar71xx (RSPRO), am335x (BBB), bcm2835 (Raspberry pi)
Differential Revision:	https://reviews.freebsd.org/D999
Reviewed by:	rpaulo
2014-11-18 01:38:39 +00:00
loos
7106eeab9b Fix the gpiobus locking by using a more sane model where it isn't necessary
hold the gpiobus lock between the gpio calls.

gpiobus_acquire_lock() now accepts a third parameter which tells gpiobus
what to do when the bus is already busy.

When GPIOBUS_WAIT wait is used, the calling thread will be put to sleep
until the bus became free.

With GPIOBUS_DONTWAIT the calling thread will receive EWOULDBLOCK right
away and then it can act upon.

This fixes the gpioiic(4) locking issues that arises when doing multiple
concurrent access on the bus.
2014-10-31 19:15:14 +00:00
loos
72aeed53f4 Move the duplicated code to a single function.
No functional changes.
2014-10-23 23:20:04 +00:00
loos
0bb25fe6bf Provide a working GPIOBUS_IVAR() macro for FDT systems. 2014-10-23 23:12:30 +00:00
loos
e80f8fa589 Move gpiobus routines to dev/gpio. Avoid polluting ofw_bus with bus
specific parts.

Requested by:	nwhitehorn
2014-05-04 04:01:26 +00:00
loos
137b57d817 Really sort out the headers.
sys/systm.h must always come after sys/param.h.

Remove sys/types.h which should never be included together with sys/param.h.

Add sys/malloc.h for correctness even if it seems to don't be needed.

Remove more unused headers found by unusedinc (from bde@) and tested with a
universe build.

Reported by:	bde
2014-05-03 20:33:00 +00:00
loos
401918349b Fix the gpio-specifier decoding by respecting the GPIO controller's
#gpio-cells property.

Add a new ofw_bus method (OFW_BUS_MAP_GPIOS()) that allows the GPIO
controller to implement its own mapping to deal with gpio-specifiers,
allowing the decoding of gpio-specifiers to be controller specific.

The default ofw_bus_map_gpios() decodes the linux standard (#gpio-cells =
<2>) and the FreeBSD standard (#gpio-cells = <3>).

It pass the gpio-specifier flag field to the children as an ivar variable so
they can act upon.
2014-04-27 12:11:00 +00:00
loos
03c3f20926 Add an OFW GPIO compatible bus. This allows the use of the DTS files to
describe GPIO bindings in the system.

Move the GPIOBUS lock macros to gpiobusvar.h as they are now shared between
the OFW and the non OFW versions of GPIO bus.

Export gpiobus_print_pins() so it can also be used on the OFW GPIO bus.

Approved by:	adrian (mentor, implicit)
2014-02-13 17:08:29 +00:00
gonzo
8485d443f7 Fix legal staff in GPIO sources:
- license clause now contains "AUTHOR AND CONTRIBUTORS"
        instead of just "AUTHOR"
    - Add license/copyright to gpioc.c

Spotted by: Edward Tomasz Napierala, Andrew Turner
2010-09-29 20:53:33 +00:00
gonzo
0502deed69 Initial GPIO bus support. Includes:
- GPIO bus controller interface
  - GPIO bus interface
  - Implementation of GPIO led(4) compatible device
  - Implementation of iic(4) bus over GPIO (author: Luiz Otavio O Souza)

Tested by: Luiz Otavio O Souza, Alexandr Rybalko
2010-09-28 03:24:53 +00:00