axi: Add AXI sandbox driver and simple emulator

Add test infrastructure and tests for the AXI uclass.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Mario Six <mario.six@gdsys.cc>

1 files changed, 85 insertions, 0 deletions

diff --git a/drivers/axi/axi-emul-uclass.c b/drivers/axi/axi-emul-uclass.c
new file mode 100644
index 0000000000..06c42006ee
--- /dev/null
+++ b/drivers/axi/axi-emul-uclass.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2018
+ * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
+ */
+
+#include <common.h>
+#include <axi.h>
+#include <dm.h>
+#include <dm/device-internal.h>
+#include <asm/axi.h>
+
+int axi_sandbox_get_emul(struct udevice *bus, ulong address,
+			 enum axi_size_t size, struct udevice **emulp)
+{
+	struct udevice *dev;
+	u32 reg[2];
+	uint offset;
+
+	switch (size) {
+	case AXI_SIZE_8:
+		offset = 1;
+		break;
+	case AXI_SIZE_16:
+		offset = 2;
+		break;
+	case AXI_SIZE_32:
+		offset = 4;
+		break;
+	default:
+		debug("%s: Unknown AXI transfer size '%d'", bus->name, size);
+		offset = 0;
+	}
+
+	/*
+	 * Note: device_find_* don't activate the devices; they're activated
+	 *	 as-needed below.
+	 */
+	for (device_find_first_child(bus, &dev);
+	     dev;
+	     device_find_next_child(&dev)) {
+		int ret;
+
+		ret = dev_read_u32_array(dev, "reg", reg, ARRAY_SIZE(reg));
+		if (ret) {
+			debug("%s: Could not read 'reg' property of %s\n",
+			      bus->name, dev->name);
+			continue;
+		}
+
+		/*
+		 * Does the transfer's address fall into this device's address
+		 * space?
+		 */
+		if (address >= reg[0] && address <= reg[0] + reg[1] - offset) {
+			/* If yes, activate it... */
+			if (device_probe(dev)) {
+				debug("%s: Could not activate %s\n",
+				      bus->name, dev->name);
+				return -ENODEV;
+			}
+
+			/* ...and return it */
+			*emulp = dev;
+			return 0;
+		}
+	}
+
+	return -ENODEV;
+}
+
+int axi_get_store(struct udevice *dev, u8 **storep)
+{
+	struct axi_emul_ops *ops = axi_emul_get_ops(dev);
+
+	if (!ops->get_store)
+		return -ENOSYS;
+
+	return ops->get_store(dev, storep);
+}
+
+UCLASS_DRIVER(axi_emul) = {
+	.id		= UCLASS_AXI_EMUL,
+	.name		= "axi_emul",
+};