[media] v4l: Renesas R-Car VSP1 driver

The VSP1 is a video processing engine that includes a blender, scalers,
filters and statistics computation. Configurable data path routing logic
allows ordering the internal blocks in a flexible way.
Due to the configurable nature of the pipeline the driver implements the
media controller API and doesn't use the V4L2 mem-to-mem framework, even
though the device usually operates in memory to memory mode.
Only the read pixel formatters, up/down scalers, write pixel formatters
and LCDC interface are supported at this stage.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 492 insertions, 0 deletions

diff --git a/drivers/media/platform/vsp1/vsp1_drv.c b/drivers/media/platform/vsp1/vsp1_drv.c
new file mode 100644
index 00000000000..e58e49c8841
--- /dev/null
+++ b/drivers/media/platform/vsp1/vsp1_drv.c
@@ -0,0 +1,492 @@
+/*
+ * vsp1_drv.c  --  R-Car VSP1 Driver
+ *
+ * Copyright (C) 2013 Renesas Corporation
+ *
+ * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/videodev2.h>
+
+#include "vsp1.h"
+#include "vsp1_lif.h"
+#include "vsp1_rwpf.h"
+#include "vsp1_uds.h"
+
+/* -----------------------------------------------------------------------------
+ * Interrupt Handling
+ */
+
+static irqreturn_t vsp1_irq_handler(int irq, void *data)
+{
+	u32 mask = VI6_WFP_IRQ_STA_DFE | VI6_WFP_IRQ_STA_FRE;
+	struct vsp1_device *vsp1 = data;
+	irqreturn_t ret = IRQ_NONE;
+	unsigned int i;
+
+	for (i = 0; i < VPS1_MAX_WPF; ++i) {
+		struct vsp1_rwpf *wpf = vsp1->wpf[i];
+		struct vsp1_pipeline *pipe;
+		u32 status;
+
+		if (wpf == NULL)
+			continue;
+
+		pipe = to_vsp1_pipeline(&wpf->entity.subdev.entity);
+		status = vsp1_read(vsp1, VI6_WPF_IRQ_STA(i));
+		vsp1_write(vsp1, VI6_WPF_IRQ_STA(i), ~status & mask);
+
+		if (status & VI6_WFP_IRQ_STA_FRE) {
+			vsp1_pipeline_frame_end(pipe);
+			ret = IRQ_HANDLED;
+		}
+	}
+
+	return ret;
+}
+
+/* -----------------------------------------------------------------------------
+ * Entities
+ */
+
+/*
+ * vsp1_create_links - Create links from all sources to the given sink
+ *
+ * This function creates media links from all valid sources to the given sink
+ * pad. Links that would be invalid according to the VSP1 hardware capabilities
+ * are skipped. Those include all links
+ *
+ * - from a UDS to a UDS (UDS entities can't be chained)
+ * - from an entity to itself (no loops are allowed)
+ */
+static int vsp1_create_links(struct vsp1_device *vsp1, struct vsp1_entity *sink)
+{
+	struct media_entity *entity = &sink->subdev.entity;
+	struct vsp1_entity *source;
+	unsigned int pad;
+	int ret;
+
+	list_for_each_entry(source, &vsp1->entities, list_dev) {
+		u32 flags;
+
+		if (source->type == sink->type)
+			continue;
+
+		if (source->type == VSP1_ENTITY_LIF ||
+		    source->type == VSP1_ENTITY_WPF)
+			continue;
+
+		flags = source->type == VSP1_ENTITY_RPF &&
+			sink->type == VSP1_ENTITY_WPF &&
+			source->index == sink->index
+		      ? MEDIA_LNK_FL_ENABLED : 0;
+
+		for (pad = 0; pad < entity->num_pads; ++pad) {
+			if (!(entity->pads[pad].flags & MEDIA_PAD_FL_SINK))
+				continue;
+
+			ret = media_entity_create_link(&source->subdev.entity,
+						       source->source_pad,
+						       entity, pad, flags);
+			if (ret < 0)
+				return ret;
+		}
+	}
+
+	return 0;
+}
+
+static void vsp1_destroy_entities(struct vsp1_device *vsp1)
+{
+	struct vsp1_entity *entity;
+	struct vsp1_entity *next;
+
+	list_for_each_entry_safe(entity, next, &vsp1->entities, list_dev) {
+		list_del(&entity->list_dev);
+		vsp1_entity_destroy(entity);
+	}
+
+	v4l2_device_unregister(&vsp1->v4l2_dev);
+	media_device_unregister(&vsp1->media_dev);
+}
+
+static int vsp1_create_entities(struct vsp1_device *vsp1)
+{
+	struct media_device *mdev = &vsp1->media_dev;
+	struct v4l2_device *vdev = &vsp1->v4l2_dev;
+	struct vsp1_entity *entity;
+	unsigned int i;
+	int ret;
+
+	mdev->dev = vsp1->dev;
+	strlcpy(mdev->model, "VSP1", sizeof(mdev->model));
+	ret = media_device_register(mdev);
+	if (ret < 0) {
+		dev_err(vsp1->dev, "media device registration failed (%d)\n",
+			ret);
+		return ret;
+	}
+
+	vdev->mdev = mdev;
+	ret = v4l2_device_register(vsp1->dev, vdev);
+	if (ret < 0) {
+		dev_err(vsp1->dev, "V4L2 device registration failed (%d)\n",
+			ret);
+		goto done;
+	}
+
+	/* Instantiate all the entities. */
+	if (vsp1->pdata->features & VSP1_HAS_LIF) {
+		vsp1->lif = vsp1_lif_create(vsp1);
+		if (IS_ERR(vsp1->lif)) {
+			ret = PTR_ERR(vsp1->lif);
+			goto done;
+		}
+
+		list_add_tail(&vsp1->lif->entity.list_dev, &vsp1->entities);
+	}
+
+	for (i = 0; i < vsp1->pdata->rpf_count; ++i) {
+		struct vsp1_rwpf *rpf;
+
+		rpf = vsp1_rpf_create(vsp1, i);
+		if (IS_ERR(rpf)) {
+			ret = PTR_ERR(rpf);
+			goto done;
+		}
+
+		vsp1->rpf[i] = rpf;
+		list_add_tail(&rpf->entity.list_dev, &vsp1->entities);
+	}
+
+	for (i = 0; i < vsp1->pdata->uds_count; ++i) {
+		struct vsp1_uds *uds;
+
+		uds = vsp1_uds_create(vsp1, i);
+		if (IS_ERR(uds)) {
+			ret = PTR_ERR(uds);
+			goto done;
+		}
+
+		vsp1->uds[i] = uds;
+		list_add_tail(&uds->entity.list_dev, &vsp1->entities);
+	}
+
+	for (i = 0; i < vsp1->pdata->wpf_count; ++i) {
+		struct vsp1_rwpf *wpf;
+
+		wpf = vsp1_wpf_create(vsp1, i);
+		if (IS_ERR(wpf)) {
+			ret = PTR_ERR(wpf);
+			goto done;
+		}
+
+		vsp1->wpf[i] = wpf;
+		list_add_tail(&wpf->entity.list_dev, &vsp1->entities);
+	}
+
+	/* Create links. */
+	list_for_each_entry(entity, &vsp1->entities, list_dev) {
+		if (entity->type == VSP1_ENTITY_LIF ||
+		    entity->type == VSP1_ENTITY_RPF)
+			continue;
+
+		ret = vsp1_create_links(vsp1, entity);
+		if (ret < 0)
+			goto done;
+	}
+
+	if (vsp1->pdata->features & VSP1_HAS_LIF) {
+		ret = media_entity_create_link(
+			&vsp1->wpf[0]->entity.subdev.entity, RWPF_PAD_SOURCE,
+			&vsp1->lif->entity.subdev.entity, LIF_PAD_SINK, 0);
+		if (ret < 0)
+			return ret;
+	}
+
+	/* Register all subdevs. */
+	list_for_each_entry(entity, &vsp1->entities, list_dev) {
+		ret = v4l2_device_register_subdev(&vsp1->v4l2_dev,
+						  &entity->subdev);
+		if (ret < 0)
+			goto done;
+	}
+
+	ret = v4l2_device_register_subdev_nodes(&vsp1->v4l2_dev);
+
+done:
+	if (ret < 0)
+		vsp1_destroy_entities(vsp1);
+
+	return ret;
+}
+
+static int vsp1_device_init(struct vsp1_device *vsp1)
+{
+	unsigned int i;
+	u32 status;
+
+	/* Reset any channel that might be running. */
+	status = vsp1_read(vsp1, VI6_STATUS);
+
+	for (i = 0; i < VPS1_MAX_WPF; ++i) {
+		unsigned int timeout;
+
+		if (!(status & VI6_STATUS_SYS_ACT(i)))
+			continue;
+
+		vsp1_write(vsp1, VI6_SRESET, VI6_SRESET_SRTS(i));
+		for (timeout = 10; timeout > 0; --timeout) {
+			status = vsp1_read(vsp1, VI6_STATUS);
+			if (!(status & VI6_STATUS_SYS_ACT(i)))
+				break;
+
+			usleep_range(1000, 2000);
+		}
+
+		if (!timeout) {
+			dev_err(vsp1->dev, "failed to reset wpf.%u\n", i);
+			return -ETIMEDOUT;
+		}
+	}
+
+	vsp1_write(vsp1, VI6_CLK_DCSWT, (8 << VI6_CLK_DCSWT_CSTPW_SHIFT) |
+		   (8 << VI6_CLK_DCSWT_CSTRW_SHIFT));
+
+	for (i = 0; i < VPS1_MAX_RPF; ++i)
+		vsp1_write(vsp1, VI6_DPR_RPF_ROUTE(i), VI6_DPR_NODE_UNUSED);
+
+	for (i = 0; i < VPS1_MAX_UDS; ++i)
+		vsp1_write(vsp1, VI6_DPR_UDS_ROUTE(i), VI6_DPR_NODE_UNUSED);
+
+	vsp1_write(vsp1, VI6_DPR_SRU_ROUTE, VI6_DPR_NODE_UNUSED);
+	vsp1_write(vsp1, VI6_DPR_LUT_ROUTE, VI6_DPR_NODE_UNUSED);
+	vsp1_write(vsp1, VI6_DPR_CLU_ROUTE, VI6_DPR_NODE_UNUSED);
+	vsp1_write(vsp1, VI6_DPR_HST_ROUTE, VI6_DPR_NODE_UNUSED);
+	vsp1_write(vsp1, VI6_DPR_HSI_ROUTE, VI6_DPR_NODE_UNUSED);
+	vsp1_write(vsp1, VI6_DPR_BRU_ROUTE, VI6_DPR_NODE_UNUSED);
+
+	vsp1_write(vsp1, VI6_DPR_HGO_SMPPT, (7 << VI6_DPR_SMPPT_TGW_SHIFT) |
+		   (VI6_DPR_NODE_UNUSED << VI6_DPR_SMPPT_PT_SHIFT));
+	vsp1_write(vsp1, VI6_DPR_HGT_SMPPT, (7 << VI6_DPR_SMPPT_TGW_SHIFT) |
+		   (VI6_DPR_NODE_UNUSED << VI6_DPR_SMPPT_PT_SHIFT));
+
+	return 0;
+}
+
+/*
+ * vsp1_device_get - Acquire the VSP1 device
+ *
+ * Increment the VSP1 reference count and initialize the device if the first
+ * reference is taken.
+ *
+ * Return a pointer to the VSP1 device or NULL if an error occured.
+ */
+struct vsp1_device *vsp1_device_get(struct vsp1_device *vsp1)
+{
+	struct vsp1_device *__vsp1 = vsp1;
+	int ret;
+
+	mutex_lock(&vsp1->lock);
+	if (vsp1->ref_count > 0)
+		goto done;
+
+	ret = clk_prepare_enable(vsp1->clock);
+	if (ret < 0) {
+		__vsp1 = NULL;
+		goto done;
+	}
+
+	ret = vsp1_device_init(vsp1);
+	if (ret < 0) {
+		clk_disable_unprepare(vsp1->clock);
+		__vsp1 = NULL;
+		goto done;
+	}
+
+done:
+	if (__vsp1)
+		vsp1->ref_count++;
+
+	mutex_unlock(&vsp1->lock);
+	return __vsp1;
+}
+
+/*
+ * vsp1_device_put - Release the VSP1 device
+ *
+ * Decrement the VSP1 reference count and cleanup the device if the last
+ * reference is released.
+ */
+void vsp1_device_put(struct vsp1_device *vsp1)
+{
+	mutex_lock(&vsp1->lock);
+
+	if (--vsp1->ref_count == 0)
+		clk_disable_unprepare(vsp1->clock);
+
+	mutex_unlock(&vsp1->lock);
+}
+
+/* -----------------------------------------------------------------------------
+ * Power Management
+ */
+
+#ifdef CONFIG_PM_SLEEP
+static int vsp1_pm_suspend(struct device *dev)
+{
+	struct vsp1_device *vsp1 = dev_get_drvdata(dev);
+
+	WARN_ON(mutex_is_locked(&vsp1->lock));
+
+	if (vsp1->ref_count == 0)
+		return 0;
+
+	clk_disable_unprepare(vsp1->clock);
+	return 0;
+}
+
+static int vsp1_pm_resume(struct device *dev)
+{
+	struct vsp1_device *vsp1 = dev_get_drvdata(dev);
+
+	WARN_ON(mutex_is_locked(&vsp1->lock));
+
+	if (vsp1->ref_count)
+		return 0;
+
+	return clk_prepare_enable(vsp1->clock);
+}
+#endif
+
+static const struct dev_pm_ops vsp1_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(vsp1_pm_suspend, vsp1_pm_resume)
+};
+
+/* -----------------------------------------------------------------------------
+ * Platform Driver
+ */
+
+static struct vsp1_platform_data *
+vsp1_get_platform_data(struct platform_device *pdev)
+{
+	struct vsp1_platform_data *pdata = pdev->dev.platform_data;
+
+	if (pdata == NULL) {
+		dev_err(&pdev->dev, "missing platform data\n");
+		return NULL;
+	}
+
+	if (pdata->rpf_count <= 0 || pdata->rpf_count > VPS1_MAX_RPF) {
+		dev_err(&pdev->dev, "invalid number of RPF (%u)\n",
+			pdata->rpf_count);
+		return NULL;
+	}
+
+	if (pdata->uds_count <= 0 || pdata->uds_count > VPS1_MAX_UDS) {
+		dev_err(&pdev->dev, "invalid number of UDS (%u)\n",
+			pdata->uds_count);
+		return NULL;
+	}
+
+	if (pdata->wpf_count <= 0 || pdata->wpf_count > VPS1_MAX_WPF) {
+		dev_err(&pdev->dev, "invalid number of WPF (%u)\n",
+			pdata->wpf_count);
+		return NULL;
+	}
+
+	return pdata;
+}
+
+static int vsp1_probe(struct platform_device *pdev)
+{
+	struct vsp1_device *vsp1;
+	struct resource *irq;
+	struct resource *io;
+	int ret;
+
+	vsp1 = devm_kzalloc(&pdev->dev, sizeof(*vsp1), GFP_KERNEL);
+	if (vsp1 == NULL)
+		return -ENOMEM;
+
+	vsp1->dev = &pdev->dev;
+	mutex_init(&vsp1->lock);
+	INIT_LIST_HEAD(&vsp1->entities);
+
+	vsp1->pdata = vsp1_get_platform_data(pdev);
+	if (vsp1->pdata == NULL)
+		return -ENODEV;
+
+	/* I/O, IRQ and clock resources */
+	io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	vsp1->mmio = devm_ioremap_resource(&pdev->dev, io);
+	if (IS_ERR((void *)vsp1->mmio))
+		return PTR_ERR((void *)vsp1->mmio);
+
+	vsp1->clock = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(vsp1->clock)) {
+		dev_err(&pdev->dev, "failed to get clock\n");
+		return PTR_ERR(vsp1->clock);
+	}
+
+	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (!irq) {
+		dev_err(&pdev->dev, "missing IRQ\n");
+		return -EINVAL;
+	}
+
+	ret = devm_request_irq(&pdev->dev, irq->start, vsp1_irq_handler,
+			      IRQF_SHARED, dev_name(&pdev->dev), vsp1);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to request IRQ\n");
+		return ret;
+	}
+
+	/* Instanciate entities */
+	ret = vsp1_create_entities(vsp1);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to create entities\n");
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, vsp1);
+
+	return 0;
+}
+
+static int vsp1_remove(struct platform_device *pdev)
+{
+	struct vsp1_device *vsp1 = platform_get_drvdata(pdev);
+
+	vsp1_destroy_entities(vsp1);
+
+	return 0;
+}
+
+static struct platform_driver vsp1_platform_driver = {
+	.probe		= vsp1_probe,
+	.remove		= vsp1_remove,
+	.driver		= {
+		.owner	= THIS_MODULE,
+		.name	= "vsp1",
+		.pm	= &vsp1_pm_ops,
+	},
+};
+
+module_platform_driver(vsp1_platform_driver);
+
+MODULE_ALIAS("vsp1");
+MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
+MODULE_DESCRIPTION("Renesas VSP1 Driver");
+MODULE_LICENSE("GPL");