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 NR_USB_REQUEST_CHANNEL 0x12
21 #define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
22 #define WRITES_IN_FLIGHT (4)
23 #define MAX_VENDOR_DESCRIPTOR_SIZE 256
25 #define GET_URB_TIMEOUT HZ
26 #define FREE_URB_TIMEOUT (HZ*2)
28 static int udl_parse_vendor_descriptor(struct drm_device *dev,
29 struct usb_device *usbdev)
31 struct udl_device *udl = to_udl(dev);
38 buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
43 total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */
44 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
46 DRM_INFO("vendor descriptor length:%x data:%11ph\n",
49 if ((desc[0] != total_len) || /* descriptor length */
50 (desc[1] != 0x5f) || /* vendor descriptor type */
51 (desc[2] != 0x01) || /* version (2 bytes) */
53 (desc[4] != total_len - 2)) /* length after type */
56 desc_end = desc + total_len;
57 desc += 5; /* the fixed header we've already parsed */
59 while (desc < desc_end) {
63 key = le16_to_cpu(*((u16 *) desc));
69 case 0x0200: { /* max_area */
71 max_area = le32_to_cpu(*((u32 *)desc));
72 DRM_DEBUG("DL chip limited to %d pixel modes\n",
74 udl->sku_pixel_limit = max_area;
87 /* allow udlfb to load for now even if firmware unrecognized */
88 DRM_ERROR("Unrecognized vendor firmware descriptor\n");
96 * Need to ensure a channel is selected before submitting URBs
98 static int udl_select_std_channel(struct udl_device *udl)
101 static const u8 set_def_chn[] = {0x57, 0xCD, 0xDC, 0xA7,
102 0x1C, 0x88, 0x5E, 0x15,
103 0x60, 0xFE, 0xC6, 0x97,
104 0x16, 0x3D, 0x47, 0xF2};
107 sendbuf = kmemdup(set_def_chn, sizeof(set_def_chn), GFP_KERNEL);
111 ret = usb_control_msg(udl->udev,
112 usb_sndctrlpipe(udl->udev, 0),
113 NR_USB_REQUEST_CHANNEL,
114 (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0,
115 sendbuf, sizeof(set_def_chn),
116 USB_CTRL_SET_TIMEOUT);
118 return ret < 0 ? ret : 0;
121 static void udl_release_urb_work(struct work_struct *work)
123 struct urb_node *unode = container_of(work, struct urb_node,
124 release_urb_work.work);
126 up(&unode->dev->urbs.limit_sem);
129 void udl_urb_completion(struct urb *urb)
131 struct urb_node *unode = urb->context;
132 struct udl_device *udl = unode->dev;
135 /* sync/async unlink faults aren't errors */
137 if (!(urb->status == -ENOENT ||
138 urb->status == -ECONNRESET ||
139 urb->status == -ESHUTDOWN)) {
140 DRM_ERROR("%s - nonzero write bulk status received: %d\n",
141 __func__, urb->status);
142 atomic_set(&udl->lost_pixels, 1);
146 urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */
148 spin_lock_irqsave(&udl->urbs.lock, flags);
149 list_add_tail(&unode->entry, &udl->urbs.list);
150 udl->urbs.available++;
151 spin_unlock_irqrestore(&udl->urbs.lock, flags);
155 * When using fb_defio, we deadlock if up() is called
156 * while another is waiting. So queue to another process.
159 schedule_delayed_work(&unode->release_urb_work, 0);
162 up(&udl->urbs.limit_sem);
165 static void udl_free_urb_list(struct drm_device *dev)
167 struct udl_device *udl = to_udl(dev);
168 int count = udl->urbs.count;
169 struct list_head *node;
170 struct urb_node *unode;
174 DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
176 /* keep waiting and freeing, until we've got 'em all */
178 down(&udl->urbs.limit_sem);
180 spin_lock_irqsave(&udl->urbs.lock, flags);
182 node = udl->urbs.list.next; /* have reserved one with sem */
185 spin_unlock_irqrestore(&udl->urbs.lock, flags);
187 unode = list_entry(node, struct urb_node, entry);
190 /* Free each separately allocated piece */
191 usb_free_coherent(urb->dev, udl->urbs.size,
192 urb->transfer_buffer, urb->transfer_dma);
199 static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
201 struct udl_device *udl = to_udl(dev);
203 struct urb_node *unode;
205 size_t wanted_size = count * size;
207 spin_lock_init(&udl->urbs.lock);
210 udl->urbs.size = size;
211 INIT_LIST_HEAD(&udl->urbs.list);
213 sema_init(&udl->urbs.limit_sem, 0);
215 udl->urbs.available = 0;
217 while (udl->urbs.count * size < wanted_size) {
218 unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
223 INIT_DELAYED_WORK(&unode->release_urb_work,
224 udl_release_urb_work);
226 urb = usb_alloc_urb(0, GFP_KERNEL);
233 buf = usb_alloc_coherent(udl->udev, size, GFP_KERNEL,
238 if (size > PAGE_SIZE) {
240 udl_free_urb_list(dev);
246 /* urb->transfer_buffer_length set to actual before submit */
247 usb_fill_bulk_urb(urb, udl->udev, usb_sndbulkpipe(udl->udev, 1),
248 buf, size, udl_urb_completion, unode);
249 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
251 list_add_tail(&unode->entry, &udl->urbs.list);
253 up(&udl->urbs.limit_sem);
255 udl->urbs.available++;
258 DRM_DEBUG("allocated %d %d byte urbs\n", udl->urbs.count, (int) size);
260 return udl->urbs.count;
263 struct urb *udl_get_urb(struct drm_device *dev)
265 struct udl_device *udl = to_udl(dev);
267 struct list_head *entry;
268 struct urb_node *unode;
269 struct urb *urb = NULL;
272 /* Wait for an in-flight buffer to complete and get re-queued */
273 ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
275 atomic_set(&udl->lost_pixels, 1);
276 DRM_INFO("wait for urb interrupted: %x available: %d\n",
277 ret, udl->urbs.available);
281 spin_lock_irqsave(&udl->urbs.lock, flags);
283 BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */
284 entry = udl->urbs.list.next;
285 list_del_init(entry);
286 udl->urbs.available--;
288 spin_unlock_irqrestore(&udl->urbs.lock, flags);
290 unode = list_entry(entry, struct urb_node, entry);
297 int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
299 struct udl_device *udl = to_udl(dev);
302 BUG_ON(len > udl->urbs.size);
304 urb->transfer_buffer_length = len; /* set to actual payload len */
305 ret = usb_submit_urb(urb, GFP_ATOMIC);
307 udl_urb_completion(urb); /* because no one else will */
308 atomic_set(&udl->lost_pixels, 1);
309 DRM_ERROR("usb_submit_urb error %x\n", ret);
314 int udl_init(struct udl_device *udl)
316 struct drm_device *dev = &udl->drm;
321 if (!udl_parse_vendor_descriptor(dev, udl->udev)) {
323 DRM_ERROR("firmware not recognized. Assume incompatible device\n");
327 if (udl_select_std_channel(udl))
328 DRM_ERROR("Selecting channel failed\n");
330 if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
331 DRM_ERROR("udl_alloc_urb_list failed\n");
336 ret = udl_modeset_init(dev);
340 ret = udl_fbdev_init(dev);
344 ret = drm_vblank_init(dev, 1);
350 udl_fbdev_cleanup(dev);
353 udl_free_urb_list(dev);
354 DRM_ERROR("%d\n", ret);
358 int udl_drop_usb(struct drm_device *dev)
360 udl_free_urb_list(dev);
364 void udl_fini(struct drm_device *dev)
366 struct udl_device *udl = to_udl(dev);
369 udl_free_urb_list(dev);
371 udl_fbdev_cleanup(dev);