gpio: Extend common GPIO header, simplify function names

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>

6 files changed, 14 insertions, 14 deletions

diff --git a/src/mainboard/google/nyan/boardid.c b/src/mainboard/google/nyan/boardid.c
index 4628cb60e0..85a55fc329 100644
--- a/src/mainboard/google/nyan/boardid.c
+++ b/src/mainboard/google/nyan/boardid.c
@@ -19,17 +19,17 @@
 
 #include <boardid.h>
 #include <console/console.h>
-#include <soc/gpio.h>
+#include <gpio.h>
 
 uint8_t board_id(void)
 {
 	static int id = -1;
 
 	if (id < 0) {
-		id = gpio_get_in_value(GPIO(Q3)) << 0 |
-		     gpio_get_in_value(GPIO(T1)) << 1 |
-		     gpio_get_in_value(GPIO(X1)) << 2 |
-		     gpio_get_in_value(GPIO(X4)) << 3;
+		id = gpio_get(GPIO(Q3)) << 0 |
+		     gpio_get(GPIO(T1)) << 1 |
+		     gpio_get(GPIO(X1)) << 2 |
+		     gpio_get(GPIO(X4)) << 3;
 		printk(BIOS_SPEW, "Board ID: %#x.\n", id);
 	}
 
diff --git a/src/mainboard/google/nyan/bootblock.c b/src/mainboard/google/nyan/bootblock.c
index 1f23d43dd3..bc3cd3efa2 100644
--- a/src/mainboard/google/nyan/bootblock.c
+++ b/src/mainboard/google/nyan/bootblock.c
@@ -21,10 +21,10 @@
 #include <bootblock_common.h>
 #include <console/console.h>
 #include <device/i2c.h>
+#include <gpio.h>
 #include <soc/addressmap.h>
 #include <soc/clk_rst.h>
 #include <soc/clock.h>
-#include <soc/gpio.h>
 #include <soc/nvidia/tegra/i2c.h>
 #include <soc/pinmux.h>
 #include <soc/spi.h>	/* FIXME: move back to soc code? */
diff --git a/src/mainboard/google/nyan/chromeos.c b/src/mainboard/google/nyan/chromeos.c
index 1210f75ad9..91a3f13de6 100644
--- a/src/mainboard/google/nyan/chromeos.c
+++ b/src/mainboard/google/nyan/chromeos.c
@@ -22,7 +22,7 @@
 #include <console/console.h>
 #include <ec/google/chromeec/ec.h>
 #include <ec/google/chromeec/ec_commands.h>
-#include <soc/gpio.h>
+#include <gpio.h>
 #include <string.h>
 #include <vendorcode/google/chromeos/chromeos.h>
 
@@ -33,7 +33,7 @@ void fill_lb_gpios(struct lb_gpios *gpios)
 	/* Write Protect: active low */
 	gpios->gpios[count].port = GPIO_R1_INDEX;
 	gpios->gpios[count].polarity = ACTIVE_LOW;
-	gpios->gpios[count].value = gpio_get_in_value(GPIO(R1));
+	gpios->gpios[count].value = gpio_get(GPIO(R1));
 	strncpy((char *)gpios->gpios[count].name, "write protect",
 		GPIO_MAX_NAME_LENGTH);
 	count++;
@@ -49,14 +49,14 @@ void fill_lb_gpios(struct lb_gpios *gpios)
 	/* Lid: active high */
 	gpios->gpios[count].port = GPIO_R4_INDEX;
 	gpios->gpios[count].polarity = ACTIVE_HIGH;
-	gpios->gpios[count].value = gpio_get_in_value(GPIO(R4));
+	gpios->gpios[count].value = gpio_get(GPIO(R4));
 	strncpy((char *)gpios->gpios[count].name, "lid", GPIO_MAX_NAME_LENGTH);
 	count++;
 
 	/* Power: active low */
 	gpios->gpios[count].port = GPIO_Q0_INDEX;
 	gpios->gpios[count].polarity = ACTIVE_LOW;
-	gpios->gpios[count].value = gpio_get_in_value(GPIO(Q0));
+	gpios->gpios[count].value = gpio_get(GPIO(Q0));
 	strncpy((char *)gpios->gpios[count].name, "power",
 		GPIO_MAX_NAME_LENGTH);
 	count++;
@@ -91,5 +91,5 @@ int get_recovery_mode_switch(void)
 
 int get_write_protect_state(void)
 {
-	return !gpio_get_in_value(GPIO(R1));
+	return !gpio_get(GPIO(R1));
 }
diff --git a/src/mainboard/google/nyan/early_configs.c b/src/mainboard/google/nyan/early_configs.c
index 046e2bd419..de9fe8ef9d 100644
--- a/src/mainboard/google/nyan/early_configs.c
+++ b/src/mainboard/google/nyan/early_configs.c
@@ -17,10 +17,10 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include <gpio.h>
 #include <soc/addressmap.h>
 #include <soc/clock.h>
 #include <soc/early_configs.h>
-#include <soc/gpio.h>
 #include <soc/nvidia/tegra/i2c.h>
 
 static struct clk_rst_ctlr *clk_rst = (void *)TEGRA_CLK_RST_BASE;
diff --git a/src/mainboard/google/nyan/mainboard.c b/src/mainboard/google/nyan/mainboard.c
index f4aa93adc2..dce4cbcbd5 100644
--- a/src/mainboard/google/nyan/mainboard.c
+++ b/src/mainboard/google/nyan/mainboard.c
@@ -21,10 +21,10 @@
 #include <device/device.h>
 #include <elog.h>
 #include <boot/coreboot_tables.h>
+#include <gpio.h>
 #include <soc/addressmap.h>
 #include <soc/clock.h>
 #include <soc/clk_rst.h>
-#include <soc/gpio.h>
 #include <soc/mc.h>
 #include <soc/nvidia/tegra/i2c.h>
 #include <soc/nvidia/tegra/usb.h>
diff --git a/src/mainboard/google/nyan/reset.c b/src/mainboard/google/nyan/reset.c
index de096c6520..e58890e604 100644
--- a/src/mainboard/google/nyan/reset.c
+++ b/src/mainboard/google/nyan/reset.c
@@ -18,7 +18,7 @@
  */
 
 #include <arch/io.h>
-#include <soc/gpio.h>
+#include <gpio.h>
 #include <reset.h>
 
 void hard_reset(void)