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2015-04-10gpio: add a function to read GPIO array as base-2 valueDavid Hendricks
This adds gpio_base2_value() which reads an array of 2-state GPIOs and returns a base-2 value, where gpio[0] represents the least significant bit. BUG=none BRANCH=none TEST=tested with follow-up patches for pinky Change-Id: I0d6bfac369da0d68079a38de0988c7b59d269a97 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: 27873b7a9ea237d13f0cbafd10033a8d0f821cbe Original-Change-Id: Ia7ffc16eb60e93413c0812573b9cf0999b92828e Original-Signed-off-by: David Hendricks <dhendrix@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/228323 Original-Reviewed-by: Julius Werner <jwerner@chromium.org> Reviewed-on: http://review.coreboot.org/9412 Tested-by: build bot (Jenkins) Reviewed-by: David Hendricks <dhendrix@chromium.org>
2015-04-10gpio: cosmetic changes to tristate_gpios.cDavid Hendricks
This patch makes a few cosmetic changes: - Rename tristate_gpios.c to gpio.c since it will soon be used for binary GPIOs as well. - Rename gpio_get_tristates() to gpio_base3_value() - The binary version will be called gpio_base2_value(). - Updates call sites. - Change the variable name "id" to something more generic. BUG=none BRANCH=none TEST=compiled for veyron_pinky and storm Change-Id: Iab7e32f4e9d70853f782695cfe6842accff1df64 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: c47d0f33ea1a6e9515211b834009cf47a171953f Original-Change-Id: I36d88c67cb118efd1730278691dc3e4ecb6055ee Original-Signed-off-by: David Hendricks <dhendrix@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/228324 Reviewed-on: http://review.coreboot.org/9411 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <pgeorgi@google.com>
2015-04-10gpio: Remove non-ternary tristate mode, make ternaries easierJulius Werner
The function to read board IDs from tristate GPIOs currently supports two output modes: a normal base-3 integer, or a custom format where every two bits represent one tristate pin. Each board decides which representation to use on its own, which is inconsistent and provides another possible gotcha to trip over when reading unfamiliar code. The two-bits-per-pin format creates the additional problem that a complete list of IDs (such as some boards use to build board-ID tables) necessarily has "holes" in them (since 0b11 does not correspond to a possible pin state), which makes them extremely tricky to write, read and expand. It's also very unintuitive in my opinion, although it was intended to make it easier to read individual pin states from a hex representation. This patch switches all boards over to base-3 and removes the other format to improve consistency. The tristate reading function will just print the pin states as they are read to make it easier to debug them, and we add a new BASE3() macro that can generate ternary numbers from pin states. Also change the order of all static initializers of board ID pin lists to write the most significant bit first, hoping that this can help clear up confusion about the endianness of the pins. CQ-DEPEND=CL:219902 BUG=None TEST=Booted on a Nyan_Blaze (with board ID 1, unfortunately the only one I have). Compiled on Daisy, Peach_Pit, Nyan, Nyan_Big, Nyan_Blaze, Rush, Rush_Ryu, Storm, Veryon_Pinky and Falco for good measure. Change-Id: I3ce5a0829f260db7d7df77e6788c2c6d13901b8f Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: 2fa9545ac431c9af111ee4444d593ee4cf49554d Original-Change-Id: I6133cdaf01ed6590ae07e88d9e85a33dc013211a Original-Signed-off-by: Julius Werner <jwerner@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/219901 Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/9401 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2015-04-10gpio: Extend common GPIO header, simplify function namesJulius Werner
We've had gpiolib.h which defines a few common GPIO access functions for a while, but it wasn't really complete. This patch adds the missing gpio_output() function, and also renames the unwieldy gpio_get_in_value() and gpio_set_out_value() to the much easier to handle gpio_get() and gpio_set(). The header is renamed to the simpler gpio.h while we're at it (there was never really anything "lib" about it, and it was presumably just chosen due to the IPQ806x include/ conflict problem that is now resolved). It also moves the definition of gpio_t into SoC-specific code, so that different implementations are free to encode their platform-specific GPIO parameters in those 4 bytes in the most convenient way (such as the rk3288 with a bitfield struct). Every SoC intending to use this common API should supply a <soc/gpio.h> that typedefs gpio_t to a type at most 4 bytes in length. Files accessing the API only need to include <gpio.h> which may pull in additional things (like a gpio_t creation macro) from <soc/gpio.h> on its own. For now the API is still only used on non-x86 SoCs. Whether it makes sense to expand it to x86 as well should be separately evaluated at a later point (by someone who understands those systems better). Also, Exynos retains its old, incompatible GPIO API even though it would be a prime candidate, because it's currently just not worth the effort. BUG=None TEST=Compiled on Daisy, Peach_Pit, Nyan_Blaze, Rush_Ryu, Storm and Veyron_Pinky. Change-Id: Ieee77373c2bd13d07ece26fa7f8b08be324842fe Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: 9e04902ada56b929e3829f2c3b4aeb618682096e Original-Change-Id: I6c1e7d1e154d9b02288aabedb397e21e1aadfa15 Original-Signed-off-by: Julius Werner <jwerner@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/220975 Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/9400 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2013-07-10ARMv7: De-uboot-ify Exynos5250 codeStefan Reinauer
When starting the Exynos5250 port, a lot of unneeded u-boot code was imported. This is an attempt to get rid of a lot of unneeded code before the port is used as a basis for further ARM ports. There is a lot more that can be done, including cleaning up the 5250's Kconfig file. Change-Id: I2d88676c436eea4b21bcb62f40018af9fabb3016 Signed-off-by: Stefan Reinauer <reinauer@google.com> Signed-off-by: Gabe Black <gabeblack@chromium.org> Reviewed-on: http://review.coreboot.org/3642 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2013-02-04add gpio.h for generic GPIO-related definitionsDavid Hendricks
This adds /src/include/gpio.h which currently contains generic GPIO enums for type (in/out/alt) and 3-state logic. The header was originally written for another FOSS project (code.google.com/p/mosys) and thus the BSD license. Change-Id: Id1dff69169e8b1ec372107737d356b0fa0d80498 Signed-off-by: David Hendricks <dhendrix@chromium.org> Reviewed-on: http://review.coreboot.org/2265 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>