test: dma: add dma-uclass test

Add a sandbox DMA driver implementation (provider) and corresponding DM
test.

Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Álvaro Fernández Rojas <noltari@gmail.com>

3 files changed, 290 insertions, 0 deletions

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index b9b85c65fc..8a4162eccd 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -19,6 +19,13 @@ config DMA_CHANNELS
 	  Enable channels support for DMA. Some DMA controllers have multiple
 	  channels which can either transfer data to/from different devices.
 
+config SANDBOX_DMA
+	bool "Enable the sandbox DMA test driver"
+	depends on DMA && DMA_CHANNELS && SANDBOX
+	help
+	  Enable support for a test DMA uclass implementation. It stimulates
+	  DMA transfer by simple copying data between channels.
+
 config TI_EDMA3
 	bool "TI EDMA3 driver"
 	help
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index 4eaef8ac65..aff31f986a 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_DMA) += dma-uclass.o
 obj-$(CONFIG_FSLDMAFEC) += MCD_tasksInit.o MCD_dmaApi.o MCD_tasks.o
 obj-$(CONFIG_APBH_DMA) += apbh_dma.o
 obj-$(CONFIG_FSL_DMA) += fsl_dma.o
+obj-$(CONFIG_SANDBOX_DMA) += sandbox-dma-test.o
 obj-$(CONFIG_TI_KSNAV) += keystone_nav.o keystone_nav_cfg.o
 obj-$(CONFIG_TI_EDMA3) += ti-edma3.o
 obj-$(CONFIG_DMA_LPC32XX) += lpc32xx_dma.o
diff --git a/drivers/dma/sandbox-dma-test.c b/drivers/dma/sandbox-dma-test.c
new file mode 100644
index 0000000000..8fcef1863e
--- /dev/null
+++ b/drivers/dma/sandbox-dma-test.c
@@ -0,0 +1,282 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Direct Memory Access U-Class Simulation driver
+ *
+ * Copyright (C) 2018 Texas Instruments Incorporated <www.ti.com>
+ *
+ * Author: Grygorii Strashko <grygorii.strashko@ti.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/read.h>
+#include <dma-uclass.h>
+#include <dt-structs.h>
+#include <errno.h>
+
+#define SANDBOX_DMA_CH_CNT 3
+#define SANDBOX_DMA_BUF_SIZE 1024
+
+struct sandbox_dma_chan {
+	struct sandbox_dma_dev *ud;
+	char name[20];
+	u32 id;
+	enum dma_direction dir;
+	bool in_use;
+	bool enabled;
+};
+
+struct sandbox_dma_dev {
+	struct device *dev;
+	u32 ch_count;
+	struct sandbox_dma_chan channels[SANDBOX_DMA_CH_CNT];
+	uchar   buf[SANDBOX_DMA_BUF_SIZE];
+	uchar	*buf_rx;
+	size_t	data_len;
+	u32	meta;
+};
+
+static int sandbox_dma_transfer(struct udevice *dev, int direction,
+				void *dst, void *src, size_t len)
+{
+	memcpy(dst, src, len);
+
+	return 0;
+}
+
+static int sandbox_dma_of_xlate(struct dma *dma,
+				struct ofnode_phandle_args *args)
+{
+	struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
+	struct sandbox_dma_chan *uc;
+
+	debug("%s(dma id=%u)\n", __func__, args->args[0]);
+
+	if (args->args[0] >= SANDBOX_DMA_CH_CNT)
+		return -EINVAL;
+
+	dma->id = args->args[0];
+
+	uc = &ud->channels[dma->id];
+
+	if (dma->id == 1)
+		uc->dir = DMA_MEM_TO_DEV;
+	else if (dma->id == 2)
+		uc->dir = DMA_DEV_TO_MEM;
+	else
+		uc->dir = DMA_MEM_TO_MEM;
+	debug("%s(dma id=%lu dir=%d)\n", __func__, dma->id, uc->dir);
+
+	return 0;
+}
+
+static int sandbox_dma_request(struct dma *dma)
+{
+	struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
+	struct sandbox_dma_chan *uc;
+
+	if (dma->id >= SANDBOX_DMA_CH_CNT)
+		return -EINVAL;
+
+	uc = &ud->channels[dma->id];
+	if (uc->in_use)
+		return -EBUSY;
+
+	uc->in_use = true;
+	debug("%s(dma id=%lu in_use=%d)\n", __func__, dma->id, uc->in_use);
+
+	return 0;
+}
+
+static int sandbox_dma_free(struct dma *dma)
+{
+	struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
+	struct sandbox_dma_chan *uc;
+
+	if (dma->id >= SANDBOX_DMA_CH_CNT)
+		return -EINVAL;
+
+	uc = &ud->channels[dma->id];
+	if (!uc->in_use)
+		return -EINVAL;
+
+	uc->in_use = false;
+	ud->buf_rx = NULL;
+	ud->data_len = 0;
+	debug("%s(dma id=%lu in_use=%d)\n", __func__, dma->id, uc->in_use);
+
+	return 0;
+}
+
+static int sandbox_dma_enable(struct dma *dma)
+{
+	struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
+	struct sandbox_dma_chan *uc;
+
+	if (dma->id >= SANDBOX_DMA_CH_CNT)
+		return -EINVAL;
+
+	uc = &ud->channels[dma->id];
+	if (!uc->in_use)
+		return -EINVAL;
+	if (uc->enabled)
+		return -EINVAL;
+
+	uc->enabled = true;
+	debug("%s(dma id=%lu enabled=%d)\n", __func__, dma->id, uc->enabled);
+
+	return 0;
+}
+
+static int sandbox_dma_disable(struct dma *dma)
+{
+	struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
+	struct sandbox_dma_chan *uc;
+
+	if (dma->id >= SANDBOX_DMA_CH_CNT)
+		return -EINVAL;
+
+	uc = &ud->channels[dma->id];
+	if (!uc->in_use)
+		return -EINVAL;
+	if (!uc->enabled)
+		return -EINVAL;
+
+	uc->enabled = false;
+	debug("%s(dma id=%lu enabled=%d)\n", __func__, dma->id, uc->enabled);
+
+	return 0;
+}
+
+static int sandbox_dma_send(struct dma *dma,
+			    void *src, size_t len, void *metadata)
+{
+	struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
+	struct sandbox_dma_chan *uc;
+
+	if (dma->id >= SANDBOX_DMA_CH_CNT)
+		return -EINVAL;
+	if (!src || !metadata)
+		return -EINVAL;
+
+	debug("%s(dma id=%lu)\n", __func__, dma->id);
+
+	uc = &ud->channels[dma->id];
+	if (uc->dir != DMA_MEM_TO_DEV)
+		return -EINVAL;
+	if (!uc->in_use)
+		return -EINVAL;
+	if (!uc->enabled)
+		return -EINVAL;
+	if (len >= SANDBOX_DMA_BUF_SIZE)
+		return -EINVAL;
+
+	memcpy(ud->buf, src, len);
+	ud->data_len = len;
+	ud->meta = *((u32 *)metadata);
+
+	debug("%s(dma id=%lu len=%zu meta=%08x)\n",
+	      __func__, dma->id, len, ud->meta);
+
+	return 0;
+}
+
+static int sandbox_dma_receive(struct dma *dma, void **dst, void *metadata)
+{
+	struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
+	struct sandbox_dma_chan *uc;
+
+	if (dma->id >= SANDBOX_DMA_CH_CNT)
+		return -EINVAL;
+	if (!dst || !metadata)
+		return -EINVAL;
+
+	uc = &ud->channels[dma->id];
+	if (uc->dir != DMA_DEV_TO_MEM)
+		return -EINVAL;
+	if (!uc->in_use)
+		return -EINVAL;
+	if (!uc->enabled)
+		return -EINVAL;
+	if (!ud->data_len)
+		return 0;
+
+	if (ud->buf_rx) {
+		memcpy(ud->buf_rx, ud->buf, ud->data_len);
+		*dst = ud->buf_rx;
+	} else {
+		memcpy(*dst, ud->buf, ud->data_len);
+	}
+
+	*((u32 *)metadata) = ud->meta;
+
+	debug("%s(dma id=%lu len=%zu meta=%08x %p)\n",
+	      __func__, dma->id, ud->data_len, ud->meta, *dst);
+
+	return ud->data_len;
+}
+
+static int sandbox_dma_prepare_rcv_buf(struct dma *dma, void *dst, size_t size)
+{
+	struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
+
+	ud->buf_rx = dst;
+
+	return 0;
+}
+
+static const struct dma_ops sandbox_dma_ops = {
+	.transfer	= sandbox_dma_transfer,
+	.of_xlate	= sandbox_dma_of_xlate,
+	.request	= sandbox_dma_request,
+	.free		= sandbox_dma_free,
+	.enable		= sandbox_dma_enable,
+	.disable	= sandbox_dma_disable,
+	.send		= sandbox_dma_send,
+	.receive	= sandbox_dma_receive,
+	.prepare_rcv_buf = sandbox_dma_prepare_rcv_buf,
+};
+
+static int sandbox_dma_probe(struct udevice *dev)
+{
+	struct dma_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+	struct sandbox_dma_dev *ud = dev_get_priv(dev);
+	int i, ret = 0;
+
+	uc_priv->supported = DMA_SUPPORTS_MEM_TO_MEM |
+			     DMA_SUPPORTS_MEM_TO_DEV |
+			     DMA_SUPPORTS_DEV_TO_MEM;
+
+	ud->ch_count = SANDBOX_DMA_CH_CNT;
+	ud->buf_rx = NULL;
+	ud->meta = 0;
+	ud->data_len = 0;
+
+	pr_err("Number of channels: %u\n", ud->ch_count);
+
+	for (i = 0; i < ud->ch_count; i++) {
+		struct sandbox_dma_chan *uc = &ud->channels[i];
+
+		uc->ud = ud;
+		uc->id = i;
+		sprintf(uc->name, "DMA chan%d\n", i);
+		uc->in_use = false;
+		uc->enabled = false;
+	}
+
+	return ret;
+}
+
+static const struct udevice_id sandbox_dma_ids[] = {
+	{ .compatible = "sandbox,dma" },
+	{ }
+};
+
+U_BOOT_DRIVER(sandbox_dma) = {
+	.name	= "sandbox-dma",
+	.id	= UCLASS_DMA,
+	.of_match = sandbox_dma_ids,
+	.ops	= &sandbox_dma_ops,
+	.probe = sandbox_dma_probe,
+	.priv_auto_alloc_size = sizeof(struct sandbox_dma_dev),
+};