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11#include <drm/drm.h>
12#include <drm/drm_print.h>
13#include <drm/drm_probe_helper.h>
14
15#include "udl_drv.h"
16
17
18#define BULK_SIZE 512
19
20#define NR_USB_REQUEST_CHANNEL 0x12
21
22#define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
23#define WRITES_IN_FLIGHT (4)
24#define MAX_VENDOR_DESCRIPTOR_SIZE 256
25
26#define GET_URB_TIMEOUT HZ
27#define FREE_URB_TIMEOUT (HZ*2)
28
29static int udl_parse_vendor_descriptor(struct udl_device *udl)
30{
31 struct usb_device *udev = udl_to_usb_device(udl);
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(udev, 0x5f,
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) ||
50 (desc[1] != 0x5f) ||
51 (desc[2] != 0x01) ||
52 (desc[3] != 0x00) ||
53 (desc[4] != total_len - 2))
54 goto unrecognized;
55
56 desc_end = desc + total_len;
57 desc += 5;
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: {
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
86unrecognized:
87
88 DRM_ERROR("Unrecognized vendor firmware descriptor\n");
89
90success:
91 kfree(buf);
92 return true;
93}
94
95
96
97
98static int udl_select_std_channel(struct udl_device *udl)
99{
100 static const u8 set_def_chn[] = {0x57, 0xCD, 0xDC, 0xA7,
101 0x1C, 0x88, 0x5E, 0x15,
102 0x60, 0xFE, 0xC6, 0x97,
103 0x16, 0x3D, 0x47, 0xF2};
104
105 void *sendbuf;
106 int ret;
107 struct usb_device *udev = udl_to_usb_device(udl);
108
109 sendbuf = kmemdup(set_def_chn, sizeof(set_def_chn), GFP_KERNEL);
110 if (!sendbuf)
111 return -ENOMEM;
112
113 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
114 NR_USB_REQUEST_CHANNEL,
115 (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0,
116 sendbuf, sizeof(set_def_chn),
117 USB_CTRL_SET_TIMEOUT);
118 kfree(sendbuf);
119 return ret < 0 ? ret : 0;
120}
121
122static void udl_release_urb_work(struct work_struct *work)
123{
124 struct urb_node *unode = container_of(work, struct urb_node,
125 release_urb_work.work);
126
127 up(&unode->dev->urbs.limit_sem);
128}
129
130void udl_urb_completion(struct urb *urb)
131{
132 struct urb_node *unode = urb->context;
133 struct udl_device *udl = unode->dev;
134 unsigned long flags;
135
136
137 if (urb->status) {
138 if (!(urb->status == -ENOENT ||
139 urb->status == -ECONNRESET ||
140 urb->status == -ESHUTDOWN)) {
141 DRM_ERROR("%s - nonzero write bulk status received: %d\n",
142 __func__, urb->status);
143 }
144 }
145
146 urb->transfer_buffer_length = udl->urbs.size;
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
156
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
165static 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
173 DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
174
175
176 while (count--) {
177 down(&udl->urbs.limit_sem);
178
179 spin_lock_irq(&udl->urbs.lock);
180
181 node = udl->urbs.list.next;
182 list_del_init(node);
183
184 spin_unlock_irq(&udl->urbs.lock);
185
186 unode = list_entry(node, struct urb_node, entry);
187 urb = unode->urb;
188
189
190 usb_free_coherent(urb->dev, udl->urbs.size,
191 urb->transfer_buffer, urb->transfer_dma);
192 usb_free_urb(urb);
193 kfree(node);
194 }
195 udl->urbs.count = 0;
196}
197
198static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
199{
200 struct udl_device *udl = to_udl(dev);
201 struct urb *urb;
202 struct urb_node *unode;
203 char *buf;
204 size_t wanted_size = count * size;
205 struct usb_device *udev = udl_to_usb_device(udl);
206
207 spin_lock_init(&udl->urbs.lock);
208
209retry:
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(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
247 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(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
263struct 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
271
272 ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
273 if (ret) {
274 DRM_INFO("wait for urb interrupted: %x available: %d\n",
275 ret, udl->urbs.available);
276 goto error;
277 }
278
279 spin_lock_irq(&udl->urbs.lock);
280
281 BUG_ON(list_empty(&udl->urbs.list));
282 entry = udl->urbs.list.next;
283 list_del_init(entry);
284 udl->urbs.available--;
285
286 spin_unlock_irq(&udl->urbs.lock);
287
288 unode = list_entry(entry, struct urb_node, entry);
289 urb = unode->urb;
290
291error:
292 return urb;
293}
294
295int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
296{
297 struct udl_device *udl = to_udl(dev);
298 int ret;
299
300 BUG_ON(len > udl->urbs.size);
301
302 urb->transfer_buffer_length = len;
303 ret = usb_submit_urb(urb, GFP_ATOMIC);
304 if (ret) {
305 udl_urb_completion(urb);
306 DRM_ERROR("usb_submit_urb error %x\n", ret);
307 }
308 return ret;
309}
310
311int udl_init(struct udl_device *udl)
312{
313 struct drm_device *dev = &udl->drm;
314 int ret = -ENOMEM;
315
316 DRM_DEBUG("\n");
317
318 udl->dmadev = usb_intf_get_dma_device(to_usb_interface(dev->dev));
319 if (!udl->dmadev)
320 drm_warn(dev, "buffer sharing not supported");
321
322 mutex_init(&udl->gem_lock);
323
324 if (!udl_parse_vendor_descriptor(udl)) {
325 ret = -ENODEV;
326 DRM_ERROR("firmware not recognized. Assume incompatible device\n");
327 goto err;
328 }
329
330 if (udl_select_std_channel(udl))
331 DRM_ERROR("Selecting channel failed\n");
332
333 if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
334 DRM_ERROR("udl_alloc_urb_list failed\n");
335 goto err;
336 }
337
338 DRM_DEBUG("\n");
339 ret = udl_modeset_init(dev);
340 if (ret)
341 goto err;
342
343 drm_kms_helper_poll_init(dev);
344
345 return 0;
346
347err:
348 if (udl->urbs.count)
349 udl_free_urb_list(dev);
350 put_device(udl->dmadev);
351 DRM_ERROR("%d\n", ret);
352 return ret;
353}
354
355int udl_drop_usb(struct drm_device *dev)
356{
357 struct udl_device *udl = to_udl(dev);
358
359 udl_free_urb_list(dev);
360 put_device(udl->dmadev);
361 udl->dmadev = NULL;
362
363 return 0;
364}
365
