[coreboot-gerrit] Patch set updated for coreboot: a7ae1d6 gpio: add a function to read GPIO array as base-2 value
Patrick Georgi (pgeorgi@google.com)
gerrit at coreboot.org
Wed Apr 8 13:31:15 CEST 2015
Patrick Georgi (pgeorgi at google.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/9412
-gerrit
commit a7ae1d6f1f63a0315aab5304c53760ed2c78cbbd
Author: David Hendricks <dhendrix at chromium.org>
Date: Thu Nov 6 15:05:35 2014 -0800
gpio: add a function to read GPIO array as base-2 value
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 at chromium.org>
Original-Commit-Id: 27873b7a9ea237d13f0cbafd10033a8d0f821cbe
Original-Change-Id: Ia7ffc16eb60e93413c0812573b9cf0999b92828e
Original-Signed-off-by: David Hendricks <dhendrix at chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/228323
Original-Reviewed-by: Julius Werner <jwerner at chromium.org>
---
src/include/gpio.h | 9 +++++++++
src/lib/gpio.c | 12 ++++++++++++
2 files changed, 21 insertions(+)
diff --git a/src/include/gpio.h b/src/include/gpio.h
index e54b156..7b64ebf 100644
--- a/src/include/gpio.h
+++ b/src/include/gpio.h
@@ -36,6 +36,15 @@ void gpio_output(gpio_t gpio, int value);
/*
* Read the value presented by the set of GPIOs, when each pin is interpreted
+ * as a base-2 digit (LOW = 0, HIGH = 1).
+ *
+ * gpio[]: pin positions to read. gpio[0] is less significant than gpio[1].
+ * num_gpio: number of pins to read.
+ */
+int gpio_base2_value(gpio_t gpio[], int num_gpio);
+
+/*
+ * Read the value presented by the set of GPIOs, when each pin is interpreted
* as a base-3 digit (LOW = 0, HIGH = 1, Z/floating = 2).
* Example: X1 = Z, X2 = 1 -> gpio_base3_value({GPIO(X1), GPIO(X2)}) = 5
* BASE3() from <base3.h> can generate numbers to compare the result to.
diff --git a/src/lib/gpio.c b/src/lib/gpio.c
index 3a646e0..0875538 100644
--- a/src/lib/gpio.c
+++ b/src/lib/gpio.c
@@ -22,6 +22,18 @@
#include <delay.h>
#include <gpio.h>
+int gpio_base2_value(gpio_t gpio[], int num_gpio)
+{
+ int i, result = 0;
+
+ for (i = 0; i < num_gpio; i++) {
+ gpio_input(gpio[i]);
+ result |= gpio_get(gpio[i]) << i;
+ }
+
+ return result;
+}
+
int gpio_base3_value(gpio_t gpio[], int num_gpio)
{
/*
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