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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 drm_device *dev,
30 struct usb_device *usbdev)
31{
32 struct udl_device *udl = to_udl(dev);
33 char *desc;
34 char *buf;
35 char *desc_end;
36
37 u8 total_len = 0;
38
39 buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
40 if (!buf)
41 return false;
42 desc = buf;
43
44 total_len = usb_get_descriptor(usbdev, 0x5f,
45 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
46 if (total_len > 5) {
47 DRM_INFO("vendor descriptor length:%x data:%11ph\n",
48 total_len, desc);
49
50 if ((desc[0] != total_len) ||
51 (desc[1] != 0x5f) ||
52 (desc[2] != 0x01) ||
53 (desc[3] != 0x00) ||
54 (desc[4] != total_len - 2))
55 goto unrecognized;
56
57 desc_end = desc + total_len;
58 desc += 5;
59
60 while (desc < desc_end) {
61 u8 length;
62 u16 key;
63
64 key = le16_to_cpu(*((u16 *) desc));
65 desc += sizeof(u16);
66 length = *desc;
67 desc++;
68
69 switch (key) {
70 case 0x0200: {
71 u32 max_area;
72 max_area = le32_to_cpu(*((u32 *)desc));
73 DRM_DEBUG("DL chip limited to %d pixel modes\n",
74 max_area);
75 udl->sku_pixel_limit = max_area;
76 break;
77 }
78 default:
79 break;
80 }
81 desc += length;
82 }
83 }
84
85 goto success;
86
87unrecognized:
88
89 DRM_ERROR("Unrecognized vendor firmware descriptor\n");
90
91success:
92 kfree(buf);
93 return true;
94}
95
96
97
98
99static int udl_select_std_channel(struct udl_device *udl)
100{
101 int ret;
102 static const u8 set_def_chn[] = {0x57, 0xCD, 0xDC, 0xA7,
103 0x1C, 0x88, 0x5E, 0x15,
104 0x60, 0xFE, 0xC6, 0x97,
105 0x16, 0x3D, 0x47, 0xF2};
106 void *sendbuf;
107
108 sendbuf = kmemdup(set_def_chn, sizeof(set_def_chn), GFP_KERNEL);
109 if (!sendbuf)
110 return -ENOMEM;
111
112 ret = usb_control_msg(udl->udev,
113 usb_sndctrlpipe(udl->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
206 spin_lock_init(&udl->urbs.lock);
207
208retry:
209 udl->urbs.size = size;
210 INIT_LIST_HEAD(&udl->urbs.list);
211
212 sema_init(&udl->urbs.limit_sem, 0);
213 udl->urbs.count = 0;
214 udl->urbs.available = 0;
215
216 while (udl->urbs.count * size < wanted_size) {
217 unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
218 if (!unode)
219 break;
220 unode->dev = udl;
221
222 INIT_DELAYED_WORK(&unode->release_urb_work,
223 udl_release_urb_work);
224
225 urb = usb_alloc_urb(0, GFP_KERNEL);
226 if (!urb) {
227 kfree(unode);
228 break;
229 }
230 unode->urb = urb;
231
232 buf = usb_alloc_coherent(udl->udev, size, GFP_KERNEL,
233 &urb->transfer_dma);
234 if (!buf) {
235 kfree(unode);
236 usb_free_urb(urb);
237 if (size > PAGE_SIZE) {
238 size /= 2;
239 udl_free_urb_list(dev);
240 goto retry;
241 }
242 break;
243 }
244
245
246 usb_fill_bulk_urb(urb, udl->udev, usb_sndbulkpipe(udl->udev, 1),
247 buf, size, udl_urb_completion, unode);
248 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
249
250 list_add_tail(&unode->entry, &udl->urbs.list);
251
252 up(&udl->urbs.limit_sem);
253 udl->urbs.count++;
254 udl->urbs.available++;
255 }
256
257 DRM_DEBUG("allocated %d %d byte urbs\n", udl->urbs.count, (int) size);
258
259 return udl->urbs.count;
260}
261
262struct urb *udl_get_urb(struct drm_device *dev)
263{
264 struct udl_device *udl = to_udl(dev);
265 int ret = 0;
266 struct list_head *entry;
267 struct urb_node *unode;
268 struct urb *urb = NULL;
269
270
271 ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
272 if (ret) {
273 DRM_INFO("wait for urb interrupted: %x available: %d\n",
274 ret, udl->urbs.available);
275 goto error;
276 }
277
278 spin_lock_irq(&udl->urbs.lock);
279
280 BUG_ON(list_empty(&udl->urbs.list));
281 entry = udl->urbs.list.next;
282 list_del_init(entry);
283 udl->urbs.available--;
284
285 spin_unlock_irq(&udl->urbs.lock);
286
287 unode = list_entry(entry, struct urb_node, entry);
288 urb = unode->urb;
289
290error:
291 return urb;
292}
293
294int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
295{
296 struct udl_device *udl = to_udl(dev);
297 int ret;
298
299 BUG_ON(len > udl->urbs.size);
300
301 urb->transfer_buffer_length = len;
302 ret = usb_submit_urb(urb, GFP_ATOMIC);
303 if (ret) {
304 udl_urb_completion(urb);
305 DRM_ERROR("usb_submit_urb error %x\n", ret);
306 }
307 return ret;
308}
309
310int udl_init(struct udl_device *udl)
311{
312 struct drm_device *dev = &udl->drm;
313 int ret = -ENOMEM;
314
315 DRM_DEBUG("\n");
316
317 mutex_init(&udl->gem_lock);
318
319 if (!udl_parse_vendor_descriptor(dev, udl->udev)) {
320 ret = -ENODEV;
321 DRM_ERROR("firmware not recognized. Assume incompatible device\n");
322 goto err;
323 }
324
325 if (udl_select_std_channel(udl))
326 DRM_ERROR("Selecting channel failed\n");
327
328 if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
329 DRM_ERROR("udl_alloc_urb_list failed\n");
330 goto err;
331 }
332
333 DRM_DEBUG("\n");
334 ret = udl_modeset_init(dev);
335 if (ret)
336 goto err;
337
338 drm_kms_helper_poll_init(dev);
339
340 return 0;
341
342err:
343 if (udl->urbs.count)
344 udl_free_urb_list(dev);
345 DRM_ERROR("%d\n", ret);
346 return ret;
347}
348
349int udl_drop_usb(struct drm_device *dev)
350{
351 udl_free_urb_list(dev);
352 return 0;
353}
354
