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authorSimon Glass <sjg@chromium.org>2014-02-26 15:59:24 -0700
committerTom Rini <trini@ti.com>2014-03-04 12:15:30 -0500
commit96495d90fe0165cf0cc721083e5a0b83771e3509 (patch)
treef1d93e0352da249c7822c3291e3b02a33ba438a7 /test
parent39f7611fecc55cbde02c8a84f7c12861abe31b53 (diff)
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dm: Add GPIO support and tests
Add driver model support for GPIOs. Since existing GPIO drivers do not use driver model, this feature must be enabled by CONFIG_DM_GPIO. After all GPO drivers are converted over we can perhaps remove this config. Tests are provided for the sandbox implementation, and are a sufficient sanity check for basic operation. The GPIO uclass understands the concept of named banks of GPIOs, with each GPIO device providing a single bank. Within each bank the GPIOs are numbered using an offset from 0 to n-1. For example a bank named 'b' with 20 offsets will provide GPIOs named b0 to b19. Anonymous GPIO banks are also supported, and are just numbered without any prefix. Each time a GPIO driver is added to the uclass, the GPIOs are renumbered accordinging, so there is always a global GPIO numbering order. Signed-off-by: Simon Glass <sjg@chromium.org> Signed-off-by: Marek Vasut <marex@denx.de> Signed-off-by: Pavel Herrmann <morpheus.ibis@gmail.com> Signed-off-by: Viktor Křivák <viktor.krivak@gmail.com> Signed-off-by: Tomas Hlavacek <tmshlvck@gmail.com>
Diffstat (limited to 'test')
-rw-r--r--test/dm/gpio.c111
1 files changed, 111 insertions, 0 deletions
diff --git a/test/dm/gpio.c b/test/dm/gpio.c
new file mode 100644
index 0000000..bf632bc
--- /dev/null
+++ b/test/dm/gpio.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2013 Google, Inc
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <fdtdec.h>
+#include <dm.h>
+#include <dm/ut.h>
+#include <dm/test.h>
+#include <dm/util.h>
+#include <asm/gpio.h>
+
+/* Test that sandbox GPIOs work correctly */
+static int dm_test_gpio(struct dm_test_state *dms)
+{
+ unsigned int offset, gpio;
+ struct dm_gpio_ops *ops;
+ struct device *dev;
+ const char *name;
+ int offset_count;
+ char buf[80];
+
+ /*
+ * We expect to get 3 banks. One is anonymous (just numbered) and
+ * comes from platdata. The other two are named a (20 gpios)
+ * and b (10 gpios) and come from the device tree. See
+ * test/dm/test.dts.
+ */
+ ut_assertok(gpio_lookup_name("b4", &dev, &offset, &gpio));
+ ut_asserteq_str(dev->name, "extra-gpios");
+ ut_asserteq(4, offset);
+ ut_asserteq(CONFIG_SANDBOX_GPIO_COUNT + 20 + 4, gpio);
+
+ name = gpio_get_bank_info(dev, &offset_count);
+ ut_asserteq_str("b", name);
+ ut_asserteq(10, offset_count);
+
+ /* Get the operations for this device */
+ ops = gpio_get_ops(dev);
+ ut_assert(ops->get_state);
+
+ /* Cannot get a value until it is reserved */
+ ut_asserteq(-1, ops->get_value(dev, offset));
+
+ /*
+ * Now some tests that use the 'sandbox' back door. All GPIOs
+ * should default to input, include b4 that we are using here.
+ */
+ ut_assertok(ops->get_state(dev, offset, buf, sizeof(buf)));
+ ut_asserteq_str("b4: in: 0 [ ]", buf);
+
+ /* Change it to an output */
+ sandbox_gpio_set_direction(dev, offset, 1);
+ ut_assertok(ops->get_state(dev, offset, buf, sizeof(buf)));
+ ut_asserteq_str("b4: out: 0 [ ]", buf);
+
+ sandbox_gpio_set_value(dev, offset, 1);
+ ut_assertok(ops->get_state(dev, offset, buf, sizeof(buf)));
+ ut_asserteq_str("b4: out: 1 [ ]", buf);
+
+ ut_assertok(ops->request(dev, offset, "testing"));
+ ut_assertok(ops->get_state(dev, offset, buf, sizeof(buf)));
+ ut_asserteq_str("b4: out: 1 [x] testing", buf);
+
+ /* Change the value a bit */
+ ut_asserteq(1, ops->get_value(dev, offset));
+ ut_assertok(ops->set_value(dev, offset, 0));
+ ut_asserteq(0, ops->get_value(dev, offset));
+ ut_assertok(ops->get_state(dev, offset, buf, sizeof(buf)));
+ ut_asserteq_str("b4: out: 0 [x] testing", buf);
+ ut_assertok(ops->set_value(dev, offset, 1));
+ ut_asserteq(1, ops->get_value(dev, offset));
+
+ /* Make it an input */
+ ut_assertok(ops->direction_input(dev, offset));
+ ut_assertok(ops->get_state(dev, offset, buf, sizeof(buf)));
+ ut_asserteq_str("b4: in: 1 [x] testing", buf);
+ sandbox_gpio_set_value(dev, offset, 0);
+ ut_asserteq(0, sandbox_gpio_get_value(dev, offset));
+ ut_assertok(ops->get_state(dev, offset, buf, sizeof(buf)));
+ ut_asserteq_str("b4: in: 0 [x] testing", buf);
+
+ ut_assertok(ops->free(dev, offset));
+ ut_assertok(ops->get_state(dev, offset, buf, sizeof(buf)));
+ ut_asserteq_str("b4: in: 0 [ ]", buf);
+
+ /* Check the 'a' bank also */
+ ut_assertok(gpio_lookup_name("a15", &dev, &offset, &gpio));
+ ut_asserteq_str(dev->name, "base-gpios");
+ ut_asserteq(15, offset);
+ ut_asserteq(CONFIG_SANDBOX_GPIO_COUNT + 15, gpio);
+
+ name = gpio_get_bank_info(dev, &offset_count);
+ ut_asserteq_str("a", name);
+ ut_asserteq(20, offset_count);
+
+ /* And the anonymous bank */
+ ut_assertok(gpio_lookup_name("14", &dev, &offset, &gpio));
+ ut_asserteq_str(dev->name, "gpio_sandbox");
+ ut_asserteq(14, offset);
+ ut_asserteq(14, gpio);
+
+ name = gpio_get_bank_info(dev, &offset_count);
+ ut_asserteq_ptr(NULL, name);
+ ut_asserteq(CONFIG_SANDBOX_GPIO_COUNT, offset_count);
+
+ return 0;
+}
+DM_TEST(dm_test_gpio, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);