2 * Copyright (C) 2012 Red Hat
4 * based in parts on udlfb.c:
5 * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
6 * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
7 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License v2. See the file COPYING in the main directory of this archive for
16 /* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
19 #define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
20 #define WRITES_IN_FLIGHT (4)
21 #define MAX_VENDOR_DESCRIPTOR_SIZE 256
23 #define GET_URB_TIMEOUT HZ
24 #define FREE_URB_TIMEOUT (HZ*2)
26 static int udl_parse_vendor_descriptor(struct drm_device *dev,
27 struct usb_device *usbdev)
29 struct udl_device *udl = dev->dev_private;
36 buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
41 total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */
42 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
44 DRM_INFO("vendor descriptor length:%x data:%02x %02x %02x %02x" \
45 "%02x %02x %02x %02x %02x %02x %02x\n",
47 desc[1], desc[2], desc[3], desc[4], desc[5], desc[6],
48 desc[7], desc[8], desc[9], desc[10]);
50 if ((desc[0] != total_len) || /* descriptor length */
51 (desc[1] != 0x5f) || /* vendor descriptor type */
52 (desc[2] != 0x01) || /* version (2 bytes) */
54 (desc[4] != total_len - 2)) /* length after type */
57 desc_end = desc + total_len;
58 desc += 5; /* the fixed header we've already parsed */
60 while (desc < desc_end) {
64 key = le16_to_cpu(*((u16 *) desc));
70 case 0x0200: { /* max_area */
72 max_area = le32_to_cpu(*((u32 *)desc));
73 DRM_DEBUG("DL chip limited to %d pixel modes\n",
75 udl->sku_pixel_limit = max_area;
88 /* allow udlfb to load for now even if firmware unrecognized */
89 DRM_ERROR("Unrecognized vendor firmware descriptor\n");
96 static void udl_release_urb_work(struct work_struct *work)
98 struct urb_node *unode = container_of(work, struct urb_node,
99 release_urb_work.work);
101 up(&unode->dev->urbs.limit_sem);
104 void udl_urb_completion(struct urb *urb)
106 struct urb_node *unode = urb->context;
107 struct udl_device *udl = unode->dev;
110 /* sync/async unlink faults aren't errors */
112 if (!(urb->status == -ENOENT ||
113 urb->status == -ECONNRESET ||
114 urb->status == -ESHUTDOWN)) {
115 DRM_ERROR("%s - nonzero write bulk status received: %d\n",
116 __func__, urb->status);
117 atomic_set(&udl->lost_pixels, 1);
121 urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */
123 spin_lock_irqsave(&udl->urbs.lock, flags);
124 list_add_tail(&unode->entry, &udl->urbs.list);
125 udl->urbs.available++;
126 spin_unlock_irqrestore(&udl->urbs.lock, flags);
130 * When using fb_defio, we deadlock if up() is called
131 * while another is waiting. So queue to another process.
134 schedule_delayed_work(&unode->release_urb_work, 0);
137 up(&udl->urbs.limit_sem);
140 static void udl_free_urb_list(struct drm_device *dev)
142 struct udl_device *udl = dev->dev_private;
143 int count = udl->urbs.count;
144 struct list_head *node;
145 struct urb_node *unode;
150 DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
152 /* keep waiting and freeing, until we've got 'em all */
155 /* Getting interrupted means a leak, but ok at shutdown*/
156 ret = down_interruptible(&udl->urbs.limit_sem);
160 spin_lock_irqsave(&udl->urbs.lock, flags);
162 node = udl->urbs.list.next; /* have reserved one with sem */
165 spin_unlock_irqrestore(&udl->urbs.lock, flags);
167 unode = list_entry(node, struct urb_node, entry);
170 /* Free each separately allocated piece */
171 usb_free_coherent(urb->dev, udl->urbs.size,
172 urb->transfer_buffer, urb->transfer_dma);
179 static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
181 struct udl_device *udl = dev->dev_private;
184 struct urb_node *unode;
187 spin_lock_init(&udl->urbs.lock);
189 udl->urbs.size = size;
190 INIT_LIST_HEAD(&udl->urbs.list);
193 unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
198 INIT_DELAYED_WORK(&unode->release_urb_work,
199 udl_release_urb_work);
201 urb = usb_alloc_urb(0, GFP_KERNEL);
208 buf = usb_alloc_coherent(udl->ddev->usbdev, MAX_TRANSFER, GFP_KERNEL,
216 /* urb->transfer_buffer_length set to actual before submit */
217 usb_fill_bulk_urb(urb, udl->ddev->usbdev, usb_sndbulkpipe(udl->ddev->usbdev, 1),
218 buf, size, udl_urb_completion, unode);
219 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
221 list_add_tail(&unode->entry, &udl->urbs.list);
226 sema_init(&udl->urbs.limit_sem, i);
228 udl->urbs.available = i;
230 DRM_DEBUG("allocated %d %d byte urbs\n", i, (int) size);
235 struct urb *udl_get_urb(struct drm_device *dev)
237 struct udl_device *udl = dev->dev_private;
239 struct list_head *entry;
240 struct urb_node *unode;
241 struct urb *urb = NULL;
244 /* Wait for an in-flight buffer to complete and get re-queued */
245 ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
247 atomic_set(&udl->lost_pixels, 1);
248 DRM_INFO("wait for urb interrupted: %x available: %d\n",
249 ret, udl->urbs.available);
253 spin_lock_irqsave(&udl->urbs.lock, flags);
255 BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */
256 entry = udl->urbs.list.next;
257 list_del_init(entry);
258 udl->urbs.available--;
260 spin_unlock_irqrestore(&udl->urbs.lock, flags);
262 unode = list_entry(entry, struct urb_node, entry);
269 int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
271 struct udl_device *udl = dev->dev_private;
274 BUG_ON(len > udl->urbs.size);
276 urb->transfer_buffer_length = len; /* set to actual payload len */
277 ret = usb_submit_urb(urb, GFP_ATOMIC);
279 udl_urb_completion(urb); /* because no one else will */
280 atomic_set(&udl->lost_pixels, 1);
281 DRM_ERROR("usb_submit_urb error %x\n", ret);
286 int udl_driver_load(struct drm_device *dev, unsigned long flags)
288 struct udl_device *udl;
292 udl = kzalloc(sizeof(struct udl_device), GFP_KERNEL);
297 dev->dev_private = udl;
299 if (!udl_parse_vendor_descriptor(dev, dev->usbdev)) {
300 DRM_ERROR("firmware not recognized. Assume incompatible device\n");
304 if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
306 DRM_ERROR("udl_alloc_urb_list failed\n");
311 ret = udl_modeset_init(dev);
313 ret = udl_fbdev_init(dev);
317 DRM_ERROR("%d\n", ret);
321 int udl_drop_usb(struct drm_device *dev)
323 udl_free_urb_list(dev);
327 int udl_driver_unload(struct drm_device *dev)
329 struct udl_device *udl = dev->dev_private;
332 udl_free_urb_list(dev);
334 udl_fbdev_cleanup(dev);
335 udl_modeset_cleanup(dev);