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:%11ph\n",
47 if ((desc[0] != total_len) || /* descriptor length */
48 (desc[1] != 0x5f) || /* vendor descriptor type */
49 (desc[2] != 0x01) || /* version (2 bytes) */
51 (desc[4] != total_len - 2)) /* length after type */
54 desc_end = desc + total_len;
55 desc += 5; /* the fixed header we've already parsed */
57 while (desc < desc_end) {
61 key = le16_to_cpu(*((u16 *) desc));
67 case 0x0200: { /* max_area */
69 max_area = le32_to_cpu(*((u32 *)desc));
70 DRM_DEBUG("DL chip limited to %d pixel modes\n",
72 udl->sku_pixel_limit = max_area;
85 /* allow udlfb to load for now even if firmware unrecognized */
86 DRM_ERROR("Unrecognized vendor firmware descriptor\n");
93 static void udl_release_urb_work(struct work_struct *work)
95 struct urb_node *unode = container_of(work, struct urb_node,
96 release_urb_work.work);
98 up(&unode->dev->urbs.limit_sem);
101 void udl_urb_completion(struct urb *urb)
103 struct urb_node *unode = urb->context;
104 struct udl_device *udl = unode->dev;
107 /* sync/async unlink faults aren't errors */
109 if (!(urb->status == -ENOENT ||
110 urb->status == -ECONNRESET ||
111 urb->status == -ESHUTDOWN)) {
112 DRM_ERROR("%s - nonzero write bulk status received: %d\n",
113 __func__, urb->status);
114 atomic_set(&udl->lost_pixels, 1);
118 urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */
120 spin_lock_irqsave(&udl->urbs.lock, flags);
121 list_add_tail(&unode->entry, &udl->urbs.list);
122 udl->urbs.available++;
123 spin_unlock_irqrestore(&udl->urbs.lock, flags);
127 * When using fb_defio, we deadlock if up() is called
128 * while another is waiting. So queue to another process.
131 schedule_delayed_work(&unode->release_urb_work, 0);
134 up(&udl->urbs.limit_sem);
137 static void udl_free_urb_list(struct drm_device *dev)
139 struct udl_device *udl = dev->dev_private;
140 int count = udl->urbs.count;
141 struct list_head *node;
142 struct urb_node *unode;
146 DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
148 /* keep waiting and freeing, until we've got 'em all */
150 down(&udl->urbs.limit_sem);
152 spin_lock_irqsave(&udl->urbs.lock, flags);
154 node = udl->urbs.list.next; /* have reserved one with sem */
157 spin_unlock_irqrestore(&udl->urbs.lock, flags);
159 unode = list_entry(node, struct urb_node, entry);
162 /* Free each separately allocated piece */
163 usb_free_coherent(urb->dev, udl->urbs.size,
164 urb->transfer_buffer, urb->transfer_dma);
171 static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
173 struct udl_device *udl = dev->dev_private;
175 struct urb_node *unode;
177 size_t wanted_size = count * size;
179 spin_lock_init(&udl->urbs.lock);
182 udl->urbs.size = size;
183 INIT_LIST_HEAD(&udl->urbs.list);
185 sema_init(&udl->urbs.limit_sem, 0);
187 udl->urbs.available = 0;
189 while (udl->urbs.count * size < wanted_size) {
190 unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
195 INIT_DELAYED_WORK(&unode->release_urb_work,
196 udl_release_urb_work);
198 urb = usb_alloc_urb(0, GFP_KERNEL);
205 buf = usb_alloc_coherent(udl->udev, size, GFP_KERNEL,
210 if (size > PAGE_SIZE) {
212 udl_free_urb_list(dev);
218 /* urb->transfer_buffer_length set to actual before submit */
219 usb_fill_bulk_urb(urb, udl->udev, usb_sndbulkpipe(udl->udev, 1),
220 buf, size, udl_urb_completion, unode);
221 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
223 list_add_tail(&unode->entry, &udl->urbs.list);
225 up(&udl->urbs.limit_sem);
227 udl->urbs.available++;
230 DRM_DEBUG("allocated %d %d byte urbs\n", udl->urbs.count, (int) size);
232 return udl->urbs.count;
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 usb_device *udev = (void*)flags;
289 struct udl_device *udl;
293 udl = kzalloc(sizeof(struct udl_device), GFP_KERNEL);
299 dev->dev_private = udl;
301 if (!udl_parse_vendor_descriptor(dev, udl->udev)) {
303 DRM_ERROR("firmware not recognized. Assume incompatible device\n");
307 if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
308 DRM_ERROR("udl_alloc_urb_list failed\n");
313 ret = udl_modeset_init(dev);
317 ret = udl_fbdev_init(dev);
321 ret = drm_vblank_init(dev, 1);
327 udl_fbdev_cleanup(dev);
330 udl_free_urb_list(dev);
332 DRM_ERROR("%d\n", ret);
336 int udl_drop_usb(struct drm_device *dev)
338 udl_free_urb_list(dev);
342 int udl_driver_unload(struct drm_device *dev)
344 struct udl_device *udl = dev->dev_private;
346 drm_vblank_cleanup(dev);
349 udl_free_urb_list(dev);
351 udl_fbdev_cleanup(dev);
352 udl_modeset_cleanup(dev);