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>

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);