1 /*
2 * Copyright (C) 2012 Red Hat
3 *
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>
8 *
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
11 * more details.
12 */
13 #include <drm/drmP.h>
14 #include "udl_drv.h"
15
16 /* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
17 #define BULK_SIZE 512
18
19 #define NR_USB_REQUEST_CHANNEL 0x12
20
21 #define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
22 #define WRITES_IN_FLIGHT (4)
23 #define MAX_VENDOR_DESCRIPTOR_SIZE 256
24
25 #define GET_URB_TIMEOUT HZ
26 #define FREE_URB_TIMEOUT (HZ*2)
27
udl_parse_vendor_descriptor(struct drm_device * dev,struct usb_device * usbdev)28 static int udl_parse_vendor_descriptor(struct drm_device *dev,
29 struct usb_device *usbdev)
30 {
31 struct udl_device *udl = to_udl(dev);
32 char *desc;
33 char *buf;
34 char *desc_end;
35
36 u8 total_len = 0;
37
38 buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
39 if (!buf)
40 return false;
41 desc = buf;
42
43 total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */
44 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
45 if (total_len > 5) {
46 DRM_INFO("vendor descriptor length:%x data:%11ph\n",
47 total_len, desc);
48
49 if ((desc[0] != total_len) || /* descriptor length */
50 (desc[1] != 0x5f) || /* vendor descriptor type */
51 (desc[2] != 0x01) || /* version (2 bytes) */
52 (desc[3] != 0x00) ||
53 (desc[4] != total_len - 2)) /* length after type */
54 goto unrecognized;
55
56 desc_end = desc + total_len;
57 desc += 5; /* the fixed header we've already parsed */
58
59 while (desc < desc_end) {
60 u8 length;
61 u16 key;
62
63 key = le16_to_cpu(*((u16 *) desc));
64 desc += sizeof(u16);
65 length = *desc;
66 desc++;
67
68 switch (key) {
69 case 0x0200: { /* max_area */
70 u32 max_area;
71 max_area = le32_to_cpu(*((u32 *)desc));
72 DRM_DEBUG("DL chip limited to %d pixel modes\n",
73 max_area);
74 udl->sku_pixel_limit = max_area;
75 break;
76 }
77 default:
78 break;
79 }
80 desc += length;
81 }
82 }
83
84 goto success;
85
86 unrecognized:
87 /* allow udlfb to load for now even if firmware unrecognized */
88 DRM_ERROR("Unrecognized vendor firmware descriptor\n");
89
90 success:
91 kfree(buf);
92 return true;
93 }
94
95 /*
96 * Need to ensure a channel is selected before submitting URBs
97 */
udl_select_std_channel(struct udl_device * udl)98 static int udl_select_std_channel(struct udl_device *udl)
99 {
100 int ret;
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};
105 void *sendbuf;
106
107 sendbuf = kmemdup(set_def_chn, sizeof(set_def_chn), GFP_KERNEL);
108 if (!sendbuf)
109 return -ENOMEM;
110
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);
117 kfree(sendbuf);
118 return ret < 0 ? ret : 0;
119 }
120
udl_release_urb_work(struct work_struct * work)121 static void udl_release_urb_work(struct work_struct *work)
122 {
123 struct urb_node *unode = container_of(work, struct urb_node,
124 release_urb_work.work);
125
126 up(&unode->dev->urbs.limit_sem);
127 }
128
udl_urb_completion(struct urb * urb)129 void udl_urb_completion(struct urb *urb)
130 {
131 struct urb_node *unode = urb->context;
132 struct udl_device *udl = unode->dev;
133 unsigned long flags;
134
135 /* sync/async unlink faults aren't errors */
136 if (urb->status) {
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);
143 }
144 }
145
146 urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */
147
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);
152
153 #if 0
154 /*
155 * When using fb_defio, we deadlock if up() is called
156 * while another is waiting. So queue to another process.
157 */
158 if (fb_defio)
159 schedule_delayed_work(&unode->release_urb_work, 0);
160 else
161 #endif
162 up(&udl->urbs.limit_sem);
163 }
164
udl_free_urb_list(struct drm_device * dev)165 static void udl_free_urb_list(struct drm_device *dev)
166 {
167 struct udl_device *udl = to_udl(dev);
168 int count = udl->urbs.count;
169 struct list_head *node;
170 struct urb_node *unode;
171 struct urb *urb;
172 unsigned long flags;
173
174 DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
175
176 /* keep waiting and freeing, until we've got 'em all */
177 while (count--) {
178 down(&udl->urbs.limit_sem);
179
180 spin_lock_irqsave(&udl->urbs.lock, flags);
181
182 node = udl->urbs.list.next; /* have reserved one with sem */
183 list_del_init(node);
184
185 spin_unlock_irqrestore(&udl->urbs.lock, flags);
186
187 unode = list_entry(node, struct urb_node, entry);
188 urb = unode->urb;
189
190 /* Free each separately allocated piece */
191 usb_free_coherent(urb->dev, udl->urbs.size,
192 urb->transfer_buffer, urb->transfer_dma);
193 usb_free_urb(urb);
194 kfree(node);
195 }
196 udl->urbs.count = 0;
197 }
198
udl_alloc_urb_list(struct drm_device * dev,int count,size_t size)199 static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
200 {
201 struct udl_device *udl = to_udl(dev);
202 struct urb *urb;
203 struct urb_node *unode;
204 char *buf;
205 size_t wanted_size = count * size;
206
207 spin_lock_init(&udl->urbs.lock);
208
209 retry:
210 udl->urbs.size = size;
211 INIT_LIST_HEAD(&udl->urbs.list);
212
213 sema_init(&udl->urbs.limit_sem, 0);
214 udl->urbs.count = 0;
215 udl->urbs.available = 0;
216
217 while (udl->urbs.count * size < wanted_size) {
218 unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
219 if (!unode)
220 break;
221 unode->dev = udl;
222
223 INIT_DELAYED_WORK(&unode->release_urb_work,
224 udl_release_urb_work);
225
226 urb = usb_alloc_urb(0, GFP_KERNEL);
227 if (!urb) {
228 kfree(unode);
229 break;
230 }
231 unode->urb = urb;
232
233 buf = usb_alloc_coherent(udl->udev, size, GFP_KERNEL,
234 &urb->transfer_dma);
235 if (!buf) {
236 kfree(unode);
237 usb_free_urb(urb);
238 if (size > PAGE_SIZE) {
239 size /= 2;
240 udl_free_urb_list(dev);
241 goto retry;
242 }
243 break;
244 }
245
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;
250
251 list_add_tail(&unode->entry, &udl->urbs.list);
252
253 up(&udl->urbs.limit_sem);
254 udl->urbs.count++;
255 udl->urbs.available++;
256 }
257
258 DRM_DEBUG("allocated %d %d byte urbs\n", udl->urbs.count, (int) size);
259
260 return udl->urbs.count;
261 }
262
udl_get_urb(struct drm_device * dev)263 struct urb *udl_get_urb(struct drm_device *dev)
264 {
265 struct udl_device *udl = to_udl(dev);
266 int ret = 0;
267 struct list_head *entry;
268 struct urb_node *unode;
269 struct urb *urb = NULL;
270 unsigned long flags;
271
272 /* Wait for an in-flight buffer to complete and get re-queued */
273 ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
274 if (ret) {
275 atomic_set(&udl->lost_pixels, 1);
276 DRM_INFO("wait for urb interrupted: %x available: %d\n",
277 ret, udl->urbs.available);
278 goto error;
279 }
280
281 spin_lock_irqsave(&udl->urbs.lock, flags);
282
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--;
287
288 spin_unlock_irqrestore(&udl->urbs.lock, flags);
289
290 unode = list_entry(entry, struct urb_node, entry);
291 urb = unode->urb;
292
293 error:
294 return urb;
295 }
296
udl_submit_urb(struct drm_device * dev,struct urb * urb,size_t len)297 int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
298 {
299 struct udl_device *udl = to_udl(dev);
300 int ret;
301
302 BUG_ON(len > udl->urbs.size);
303
304 urb->transfer_buffer_length = len; /* set to actual payload len */
305 ret = usb_submit_urb(urb, GFP_ATOMIC);
306 if (ret) {
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);
310 }
311 return ret;
312 }
313
udl_init(struct udl_device * udl)314 int udl_init(struct udl_device *udl)
315 {
316 struct drm_device *dev = &udl->drm;
317 int ret = -ENOMEM;
318
319 DRM_DEBUG("\n");
320
321 if (!udl_parse_vendor_descriptor(dev, udl->udev)) {
322 ret = -ENODEV;
323 DRM_ERROR("firmware not recognized. Assume incompatible device\n");
324 goto err;
325 }
326
327 if (udl_select_std_channel(udl))
328 DRM_ERROR("Selecting channel failed\n");
329
330 if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
331 DRM_ERROR("udl_alloc_urb_list failed\n");
332 goto err;
333 }
334
335 DRM_DEBUG("\n");
336 ret = udl_modeset_init(dev);
337 if (ret)
338 goto err;
339
340 ret = udl_fbdev_init(dev);
341 if (ret)
342 goto err;
343
344 ret = drm_vblank_init(dev, 1);
345 if (ret)
346 goto err_fb;
347
348 return 0;
349 err_fb:
350 udl_fbdev_cleanup(dev);
351 err:
352 if (udl->urbs.count)
353 udl_free_urb_list(dev);
354 DRM_ERROR("%d\n", ret);
355 return ret;
356 }
357
udl_drop_usb(struct drm_device * dev)358 int udl_drop_usb(struct drm_device *dev)
359 {
360 udl_free_urb_list(dev);
361 return 0;
362 }
363
udl_fini(struct drm_device * dev)364 void udl_fini(struct drm_device *dev)
365 {
366 struct udl_device *udl = to_udl(dev);
367
368 if (udl->urbs.count)
369 udl_free_urb_list(dev);
370
371 udl_fbdev_cleanup(dev);
372 }
373