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path: root/drivers/gpio/tegra_gpio.c
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* tegra: gpio: Show the GPIO value for outputsSimon Glass2016-02-16-1/+4
| | | | | | | | | | | | | | | | | | | The tegra GPIO controller has two ways of reading the value of a GPIO. It can supply the 'input' value (which is the value read from the pin) and the 'output' value (which is the value being driven from the pin. With a GPIO set to output mode, the 'input' value is always low which is not very useful. This has the unfortunate result that setting a GPIO high still leaves it showing as low in the 'gpio status' command. Adjust the driver to check which direction the GPIO is set to, then read the value from the appropriate register: 'input' for input GPIOs, 'output' for output GPIOs. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Joe Hershberger <joe.hershberger@ni.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
* gpio: tegra: use named constantsStephen Warren2015-10-02-14/+19
| | | | | | | | | | | | | | In order to make it clear what the parameters to set_config() and set_direction() mean, and similarly for the return values from the respective get_*(), define named constants for these values. Disassembly shows no diff in the generated code, except that the order of the code in the branches of tegra_gpio_get_function() gets modified without affecting behaviour. Suggested-by: Tom Warren <twarren@nvidia.com> Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
* gpio: tegra: remove unused typeStephen Warren2015-10-02-7/+0
| | | | | | | | These enum values aren't used anywhere. Remove them. Signed-off-by: Stephen Warren <swarren@nvidia.com> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Warren <twarren@nvidia.com>
* ARM: tegra: don't enable GPIOs until direction is setStephen Warren2015-10-02-12/+6
| | | | | | | | | | | | | | | | | | | | | | Tegra's GPIO driver currently enables pins as GPIO as soon as they're requested. This is not safe, since the desired direction and output value are not yet known. This could cause a glitch on the output pins between gpio_request() and gpio_direction_*(), depending on what values happen to be in the GPIO controller's in/out and out-value registers vs. the final desired configuration. To solve this, defer enabling pins as GPIOs until some gpio_direction_*() is invoked, and the desired configuration is explicitly programmed. In theory this change could cause regressions, if code exists that claims a GPIO, never explicitly sets a direction, and then gets/sets the GPIO value based on that assumption. However, I've read through all the Tegra- related board files and device drivers that touch GPIOs and I do not see such buggy code anywhere. Signed-off-by: Stephen Warren <swarren@nvidia.com> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Warren <twarren@nvidia.com>
* ARM: tegra: fix GPIO init table programmingStephen Warren2015-10-02-3/+5
| | | | | | | | | | | | | Tegra's gpio_config_table() currently uses common GPIO APIs. These used to work without requesting the GPIO, but since commit 2fccd2d96bad "tegra: Convert tegra GPIO driver to use driver model" no longer do so. This prevents any of the GPIO initialization table from being applied to HW. Fix gpio_config_table() to directly program the HW to solve this. Fixes: 2fccd2d96bad ("tegra: Convert tegra GPIO driver to use driver model") Signed-off-by: Stephen Warren <swarren@nvidia.com> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Warren <twarren@nvidia.com>
* dm: Use dev_get_addr() where possibleSimon Glass2015-08-31-2/+1
| | | | | | | | | | This is a convenient way for a driver to get the hardware address of a device, when regmap or syscon are not being used. Change existing callers to use it as an example to others. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Joe Hershberger <joe.hershberger@ni.com> Acked-by: Stephen Warren <swarren@wwwdotorg.org>
* dm: core: Add dev_get_uclass_priv() to access uclass private dataSimon Glass2015-04-16-1/+1
| | | | | | | | Add a convenience function to access the private data that a uclass stores for each of its devices. Convert over most existing uses for consistency and to provide an example for others. Signed-off-by: Simon Glass <sjg@chromium.org>
* dm: tegra: Enable driver model in SPL and adjust the GPIO driverSimon Glass2015-03-04-16/+11
| | | | | | | | | | | Use the full driver model GPIO and serial drivers in SPL now that these are supported. Since device tree is not available they will use platform data. Remove the special SPL GPIO function as it is no longer needed. This is all in one commit to maintain bisectability. Signed-off-by: Simon Glass <sjg@chromium.org>
* dm: tegra: Add a GPIO translation functionSimon Glass2015-01-29-0/+18
| | | | | | | This deals with the polarity bit and selecting the correct bank device given a GPIO number. Signed-off-by: Simon Glass <sjg@chromium.org>
* dm: gpio: tegra: Drop request()/free() in the driverSimon Glass2014-10-23-113/+0
| | | | | | | Now that the uclass supports gpio_request/free() there is no need for the driver to implement it too. Drop this unnecessary code. Signed-off-by: Simon Glass <sjg@chromium.org>
* tegra: gpio: fix null label regressionMarcel Ziswiler2014-10-22-0/+3
| | | | | | | | | | | | | | | | Fix Tegra GPIO driver to not crash resp. misbehave upon requesting GPIOs with an empty aka NULL label. As the driver uses exclusively the label to check for reservation status actually supplying one is mandatory! This fixes a regression introduced by commit: 2fccd2d96badcdf6165658a99771a4c475586279 tegra: Convert tegra GPIO driver to use driver model Signed-off-by: Marcel Ziswiler <marcel@ziswiler.com> Acked-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Warren <twarren@nvidia.com>
* tegra: Convert tegra GPIO driver to use driver modelSimon Glass2014-09-10-55/+272
| | | | | | | | | | | | | | | | This is an implementation of GPIOs for Tegra that uses driver model. It has been tested on trimslice and also using the new iotrace feature. The implementation uses a top-level GPIO device (which has no actual GPIOS). Under this all the banks are created as separate GPIO devices. The GPIOs are named as per the Tegra datasheet/header files: A0..A7, B0..B7, ..., Z0..Z7, AA0..AA7, etc. Since driver model is not yet available before relocation, or in SPL, a special function is provided for seaboard's SPL code. Signed-off-by: Simon Glass <sjg@chromium.org>
* ARM: tegra: add GPIO initialization table functionStephen Warren2014-05-13-0/+20
| | | | | | | | | | | The HW-defined procedure for booting Tegra requires that some pins be set up as GPIOs immediately at boot in order to avoid glitches on those pins, when the pinmux is programmed. Add a feature to the GPIO driver which executes a GPIO configuration table. Board files will use this to implement the correct HW initialization procedure. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
* Add GPL-2.0+ SPDX-License-Identifier to source filesWolfgang Denk2013-07-24-17/+1
| | | | | | Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
* Tegra20: Move some include files to arch-tegra for sharing with Tegra30Tom Warren2012-10-15-1/+1
| | | | | | | | | | | The move is pretty straight-forward. ap20.h and tegra20.h were renamed to ap.h and tegra.h. Some files remain in arch-tegra20 but 'include' a file in 'arch-tegra' with #defines & structs that will be common between T20 and T30 HW. HW-specific #defines, etc. stay in the 'arch-tegra20' 'root' file. All boards build OK w/MAKEALL -s tegra20. Checkpatch.pl runs clean. Seaboard works OK. Signed-off-by: Tom Warren <twarren@nvidia.com>
* Tegra: Change Tegra20 to Tegra in common code, prep for T30Tom Warren2012-09-10-4/+4
| | | | | | | | | | Convert TEGRA20_ defines to either TEGRA_ or NV_PA_ where appropriate. Convert tegra20_ source file and function names to tegra_, also. Upcoming Tegra30 port will use common code/defines/names where possible. Signed-off-by: Tom Warren <twarren@nvidia.com> Acked-by: Stephen Warren <swarren@nvidia.com>
* tegra20: rename tegra2 -> tegra20Allen Martin2012-09-01-6/+6
| | | | | | | | | | This is make naming consistent with the kernel and devicetree and in preparation of pulling out the common tegra20 code. Signed-off-by: Allen Martin <amartin@nvidia.com> Acked-by: Stephen Warren <swarren@wwwdotorg.org> Tested-by: Thierry Reding <thierry.reding@avionic-design.de> Signed-off-by: Tom Warren <twarren@nvidia.com>
* gpio: tegra2: rename tegra2_gpio.* to tegra_gpio.*Tom Warren2012-07-07-0/+262
In anticipation of Tegra3 support, continue removing/renaming Tegra2-specific files. No functional changes (yet). Updated copyrights to 2012. Signed-off-by: Tom Warren <twarren@nvidia.com>
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