1 files changed, 360 insertions, 0 deletions

diff --git a/drivers/gpu/drm/udl/udl_main.c b/drivers/gpu/drm/udl/udl_main.c
new file mode 100644
index 000000000..061cb88c0
--- /dev/null
+++ b/drivers/gpu/drm/udl/udl_main.c
@@ -0,0 +1,360 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012 Red Hat
+ *
+ * based in parts on udlfb.c:
+ * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
+ * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
+ * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
+ */
+
+#include <drm/drm.h>
+#include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
+
+#include "udl_drv.h"
+
+/* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
+#define BULK_SIZE 512
+
+#define NR_USB_REQUEST_CHANNEL 0x12
+
+#define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
+#define WRITES_IN_FLIGHT (20)
+#define MAX_VENDOR_DESCRIPTOR_SIZE 256
+
+static struct urb *udl_get_urb_locked(struct udl_device *udl, long timeout);
+
+static int udl_parse_vendor_descriptor(struct udl_device *udl)
+{
+	struct usb_device *udev = udl_to_usb_device(udl);
+	char *desc;
+	char *buf;
+	char *desc_end;
+
+	u8 total_len = 0;
+
+	buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
+	if (!buf)
+		return false;
+	desc = buf;
+
+	total_len = usb_get_descriptor(udev, 0x5f, /* vendor specific */
+				    0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
+	if (total_len > 5) {
+		DRM_INFO("vendor descriptor length:%x data:%11ph\n",
+			total_len, desc);
+
+		if ((desc[0] != total_len) || /* descriptor length */
+		    (desc[1] != 0x5f) ||   /* vendor descriptor type */
+		    (desc[2] != 0x01) ||   /* version (2 bytes) */
+		    (desc[3] != 0x00) ||
+		    (desc[4] != total_len - 2)) /* length after type */
+			goto unrecognized;
+
+		desc_end = desc + total_len;
+		desc += 5; /* the fixed header we've already parsed */
+
+		while (desc < desc_end) {
+			u8 length;
+			u16 key;
+
+			key = le16_to_cpu(*((u16 *) desc));
+			desc += sizeof(u16);
+			length = *desc;
+			desc++;
+
+			switch (key) {
+			case 0x0200: { /* max_area */
+				u32 max_area;
+				max_area = le32_to_cpu(*((u32 *)desc));
+				DRM_DEBUG("DL chip limited to %d pixel modes\n",
+					max_area);
+				udl->sku_pixel_limit = max_area;
+				break;
+			}
+			default:
+				break;
+			}
+			desc += length;
+		}
+	}
+
+	goto success;
+
+unrecognized:
+	/* allow udlfb to load for now even if firmware unrecognized */
+	DRM_ERROR("Unrecognized vendor firmware descriptor\n");
+
+success:
+	kfree(buf);
+	return true;
+}
+
+/*
+ * Need to ensure a channel is selected before submitting URBs
+ */
+int udl_select_std_channel(struct udl_device *udl)
+{
+	static const u8 set_def_chn[] = {0x57, 0xCD, 0xDC, 0xA7,
+					 0x1C, 0x88, 0x5E, 0x15,
+					 0x60, 0xFE, 0xC6, 0x97,
+					 0x16, 0x3D, 0x47, 0xF2};
+
+	void *sendbuf;
+	int ret;
+	struct usb_device *udev = udl_to_usb_device(udl);
+
+	sendbuf = kmemdup(set_def_chn, sizeof(set_def_chn), GFP_KERNEL);
+	if (!sendbuf)
+		return -ENOMEM;
+
+	ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+			      NR_USB_REQUEST_CHANNEL,
+			      (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0,
+			      sendbuf, sizeof(set_def_chn),
+			      USB_CTRL_SET_TIMEOUT);
+	kfree(sendbuf);
+	return ret < 0 ? ret : 0;
+}
+
+void udl_urb_completion(struct urb *urb)
+{
+	struct urb_node *unode = urb->context;
+	struct udl_device *udl = unode->dev;
+	unsigned long flags;
+
+	/* sync/async unlink faults aren't errors */
+	if (urb->status) {
+		if (!(urb->status == -ENOENT ||
+		    urb->status == -ECONNRESET ||
+		    urb->status == -EPROTO ||
+		    urb->status == -ESHUTDOWN)) {
+			DRM_ERROR("%s - nonzero write bulk status received: %d\n",
+				__func__, urb->status);
+		}
+	}
+
+	urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */
+
+	spin_lock_irqsave(&udl->urbs.lock, flags);
+	list_add_tail(&unode->entry, &udl->urbs.list);
+	udl->urbs.available++;
+	spin_unlock_irqrestore(&udl->urbs.lock, flags);
+
+	wake_up(&udl->urbs.sleep);
+}
+
+static void udl_free_urb_list(struct drm_device *dev)
+{
+	struct udl_device *udl = to_udl(dev);
+	struct urb_node *unode;
+	struct urb *urb;
+
+	DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
+
+	/* keep waiting and freeing, until we've got 'em all */
+	while (udl->urbs.count) {
+		spin_lock_irq(&udl->urbs.lock);
+		urb = udl_get_urb_locked(udl, MAX_SCHEDULE_TIMEOUT);
+		udl->urbs.count--;
+		spin_unlock_irq(&udl->urbs.lock);
+		if (WARN_ON(!urb))
+			break;
+		unode = urb->context;
+		/* Free each separately allocated piece */
+		usb_free_coherent(urb->dev, udl->urbs.size,
+				  urb->transfer_buffer, urb->transfer_dma);
+		usb_free_urb(urb);
+		kfree(unode);
+	}
+
+	wake_up_all(&udl->urbs.sleep);
+}
+
+static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
+{
+	struct udl_device *udl = to_udl(dev);
+	struct urb *urb;
+	struct urb_node *unode;
+	char *buf;
+	size_t wanted_size = count * size;
+	struct usb_device *udev = udl_to_usb_device(udl);
+
+	spin_lock_init(&udl->urbs.lock);
+	INIT_LIST_HEAD(&udl->urbs.list);
+	init_waitqueue_head(&udl->urbs.sleep);
+	udl->urbs.count = 0;
+	udl->urbs.available = 0;
+
+retry:
+	udl->urbs.size = size;
+
+	while (udl->urbs.count * size < wanted_size) {
+		unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
+		if (!unode)
+			break;
+		unode->dev = udl;
+
+		urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (!urb) {
+			kfree(unode);
+			break;
+		}
+		unode->urb = urb;
+
+		buf = usb_alloc_coherent(udev, size, GFP_KERNEL,
+					 &urb->transfer_dma);
+		if (!buf) {
+			kfree(unode);
+			usb_free_urb(urb);
+			if (size > PAGE_SIZE) {
+				size /= 2;
+				udl_free_urb_list(dev);
+				goto retry;
+			}
+			break;
+		}
+
+		/* urb->transfer_buffer_length set to actual before submit */
+		usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, 1),
+				  buf, size, udl_urb_completion, unode);
+		urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
+		list_add_tail(&unode->entry, &udl->urbs.list);
+
+		udl->urbs.count++;
+		udl->urbs.available++;
+	}
+
+	DRM_DEBUG("allocated %d %d byte urbs\n", udl->urbs.count, (int) size);
+
+	return udl->urbs.count;
+}
+
+static struct urb *udl_get_urb_locked(struct udl_device *udl, long timeout)
+{
+	struct urb_node *unode;
+
+	assert_spin_locked(&udl->urbs.lock);
+
+	/* Wait for an in-flight buffer to complete and get re-queued */
+	if (!wait_event_lock_irq_timeout(udl->urbs.sleep,
+					 !udl->urbs.count ||
+					 !list_empty(&udl->urbs.list),
+					 udl->urbs.lock, timeout)) {
+		DRM_INFO("wait for urb interrupted: available: %d\n",
+			 udl->urbs.available);
+		return NULL;
+	}
+
+	if (!udl->urbs.count)
+		return NULL;
+
+	unode = list_first_entry(&udl->urbs.list, struct urb_node, entry);
+	list_del_init(&unode->entry);
+	udl->urbs.available--;
+
+	return unode ? unode->urb : NULL;
+}
+
+#define GET_URB_TIMEOUT	HZ
+struct urb *udl_get_urb(struct drm_device *dev)
+{
+	struct udl_device *udl = to_udl(dev);
+	struct urb *urb;
+
+	spin_lock_irq(&udl->urbs.lock);
+	urb = udl_get_urb_locked(udl, GET_URB_TIMEOUT);
+	spin_unlock_irq(&udl->urbs.lock);
+	return urb;
+}
+
+int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
+{
+	struct udl_device *udl = to_udl(dev);
+	int ret;
+
+	if (WARN_ON(len > udl->urbs.size)) {
+		ret = -EINVAL;
+		goto error;
+	}
+	urb->transfer_buffer_length = len; /* set to actual payload len */
+	ret = usb_submit_urb(urb, GFP_ATOMIC);
+ error:
+	if (ret) {
+		udl_urb_completion(urb); /* because no one else will */
+		DRM_ERROR("usb_submit_urb error %x\n", ret);
+	}
+	return ret;
+}
+
+/* wait until all pending URBs have been processed */
+void udl_sync_pending_urbs(struct drm_device *dev)
+{
+	struct udl_device *udl = to_udl(dev);
+
+	spin_lock_irq(&udl->urbs.lock);
+	/* 2 seconds as a sane timeout */
+	if (!wait_event_lock_irq_timeout(udl->urbs.sleep,
+					 udl->urbs.available == udl->urbs.count,
+					 udl->urbs.lock,
+					 msecs_to_jiffies(2000)))
+		drm_err(dev, "Timeout for syncing pending URBs\n");
+	spin_unlock_irq(&udl->urbs.lock);
+}
+
+int udl_init(struct udl_device *udl)
+{
+	struct drm_device *dev = &udl->drm;
+	int ret = -ENOMEM;
+
+	DRM_DEBUG("\n");
+
+	udl->dmadev = usb_intf_get_dma_device(to_usb_interface(dev->dev));
+	if (!udl->dmadev)
+		drm_warn(dev, "buffer sharing not supported"); /* not an error */
+
+	mutex_init(&udl->gem_lock);
+
+	if (!udl_parse_vendor_descriptor(udl)) {
+		ret = -ENODEV;
+		DRM_ERROR("firmware not recognized. Assume incompatible device\n");
+		goto err;
+	}
+
+	if (udl_select_std_channel(udl))
+		DRM_ERROR("Selecting channel failed\n");
+
+	if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
+		DRM_ERROR("udl_alloc_urb_list failed\n");
+		goto err;
+	}
+
+	DRM_DEBUG("\n");
+	ret = udl_modeset_init(dev);
+	if (ret)
+		goto err;
+
+	drm_kms_helper_poll_init(dev);
+
+	return 0;
+
+err:
+	if (udl->urbs.count)
+		udl_free_urb_list(dev);
+	put_device(udl->dmadev);
+	DRM_ERROR("%d\n", ret);
+	return ret;
+}
+
+int udl_drop_usb(struct drm_device *dev)
+{
+	struct udl_device *udl = to_udl(dev);
+
+	udl_free_urb_list(dev);
+	put_device(udl->dmadev);
+	udl->dmadev = NULL;
+
+	return 0;
+}