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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 MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
20#define WRITES_IN_FLIGHT (4)
21#define MAX_VENDOR_DESCRIPTOR_SIZE 256
22
23#define GET_URB_TIMEOUT HZ
24#define FREE_URB_TIMEOUT (HZ*2)
25
26static int udl_parse_vendor_descriptor(struct drm_device *dev,
27 struct usb_device *usbdev)
28{
29 struct udl_device *udl = dev->dev_private;
30 char *desc;
31 char *buf;
32 char *desc_end;
33
34 u8 total_len = 0;
35
36 buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
37 if (!buf)
38 return false;
39 desc = buf;
40
41 total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */
42 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
43 if (total_len > 5) {
44 DRM_INFO("vendor descriptor length:%x data:%11ph\n",
45 total_len, desc);
46
47 if ((desc[0] != total_len) || /* descriptor length */
48 (desc[1] != 0x5f) || /* vendor descriptor type */
49 (desc[2] != 0x01) || /* version (2 bytes) */
50 (desc[3] != 0x00) ||
51 (desc[4] != total_len - 2)) /* length after type */
52 goto unrecognized;
53
54 desc_end = desc + total_len;
55 desc += 5; /* the fixed header we've already parsed */
56
57 while (desc < desc_end) {
58 u8 length;
59 u16 key;
60
61 key = le16_to_cpu(*((u16 *) desc));
62 desc += sizeof(u16);
63 length = *desc;
64 desc++;
65
66 switch (key) {
67 case 0x0200: { /* max_area */
68 u32 max_area;
69 max_area = le32_to_cpu(*((u32 *)desc));
70 DRM_DEBUG("DL chip limited to %d pixel modes\n",
71 max_area);
72 udl->sku_pixel_limit = max_area;
73 break;
74 }
75 default:
76 break;
77 }
78 desc += length;
79 }
80 }
81
82 goto success;
83
84unrecognized:
85 /* allow udlfb to load for now even if firmware unrecognized */
86 DRM_ERROR("Unrecognized vendor firmware descriptor\n");
87
88success:
89 kfree(buf);
90 return true;
91}
92
93static void udl_release_urb_work(struct work_struct *work)
94{
95 struct urb_node *unode = container_of(work, struct urb_node,
96 release_urb_work.work);
97
98 up(&unode->dev->urbs.limit_sem);
99}
100
101void udl_urb_completion(struct urb *urb)
102{
103 struct urb_node *unode = urb->context;
104 struct udl_device *udl = unode->dev;
105 unsigned long flags;
106
107 /* sync/async unlink faults aren't errors */
108 if (urb->status) {
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);
115 }
116 }
117
118 urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */
119
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);
124
125#if 0
126 /*
127 * When using fb_defio, we deadlock if up() is called
128 * while another is waiting. So queue to another process.
129 */
130 if (fb_defio)
131 schedule_delayed_work(&unode->release_urb_work, 0);
132 else
133#endif
134 up(&udl->urbs.limit_sem);
135}
136
137static void udl_free_urb_list(struct drm_device *dev)
138{
139 struct udl_device *udl = dev->dev_private;
140 int count = udl->urbs.count;
141 struct list_head *node;
142 struct urb_node *unode;
143 struct urb *urb;
144 int ret;
145 unsigned long flags;
146
147 DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
148
149 /* keep waiting and freeing, until we've got 'em all */
150 while (count--) {
151
152 /* Getting interrupted means a leak, but ok at shutdown*/
153 ret = down_interruptible(&udl->urbs.limit_sem);
154 if (ret)
155 break;
156
157 spin_lock_irqsave(&udl->urbs.lock, flags);
158
159 node = udl->urbs.list.next; /* have reserved one with sem */
160 list_del_init(node);
161
162 spin_unlock_irqrestore(&udl->urbs.lock, flags);
163
164 unode = list_entry(node, struct urb_node, entry);
165 urb = unode->urb;
166
167 /* Free each separately allocated piece */
168 usb_free_coherent(urb->dev, udl->urbs.size,
169 urb->transfer_buffer, urb->transfer_dma);
170 usb_free_urb(urb);
171 kfree(node);
172 }
173 udl->urbs.count = 0;
174}
175
176static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
177{
178 struct udl_device *udl = dev->dev_private;
179 int i = 0;
180 struct urb *urb;
181 struct urb_node *unode;
182 char *buf;
183
184 spin_lock_init(&udl->urbs.lock);
185
186 udl->urbs.size = size;
187 INIT_LIST_HEAD(&udl->urbs.list);
188
189 while (i < count) {
190 unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
191 if (!unode)
192 break;
193 unode->dev = udl;
194
195 INIT_DELAYED_WORK(&unode->release_urb_work,
196 udl_release_urb_work);
197
198 urb = usb_alloc_urb(0, GFP_KERNEL);
199 if (!urb) {
200 kfree(unode);
201 break;
202 }
203 unode->urb = urb;
204
205 buf = usb_alloc_coherent(udl->udev, MAX_TRANSFER, GFP_KERNEL,
206 &urb->transfer_dma);
207 if (!buf) {
208 kfree(unode);
209 usb_free_urb(urb);
210 break;
211 }
212
213 /* urb->transfer_buffer_length set to actual before submit */
214 usb_fill_bulk_urb(urb, udl->udev, usb_sndbulkpipe(udl->udev, 1),
215 buf, size, udl_urb_completion, unode);
216 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
217
218 list_add_tail(&unode->entry, &udl->urbs.list);
219
220 i++;
221 }
222
223 sema_init(&udl->urbs.limit_sem, i);
224 udl->urbs.count = i;
225 udl->urbs.available = i;
226
227 DRM_DEBUG("allocated %d %d byte urbs\n", i, (int) size);
228
229 return i;
230}
231
232struct urb *udl_get_urb(struct drm_device *dev)
233{
234 struct udl_device *udl = dev->dev_private;
235 int ret = 0;
236 struct list_head *entry;
237 struct urb_node *unode;
238 struct urb *urb = NULL;
239 unsigned long flags;
240
241 /* Wait for an in-flight buffer to complete and get re-queued */
242 ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
243 if (ret) {
244 atomic_set(&udl->lost_pixels, 1);
245 DRM_INFO("wait for urb interrupted: %x available: %d\n",
246 ret, udl->urbs.available);
247 goto error;
248 }
249
250 spin_lock_irqsave(&udl->urbs.lock, flags);
251
252 BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */
253 entry = udl->urbs.list.next;
254 list_del_init(entry);
255 udl->urbs.available--;
256
257 spin_unlock_irqrestore(&udl->urbs.lock, flags);
258
259 unode = list_entry(entry, struct urb_node, entry);
260 urb = unode->urb;
261
262error:
263 return urb;
264}
265
266int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
267{
268 struct udl_device *udl = dev->dev_private;
269 int ret;
270
271 BUG_ON(len > udl->urbs.size);
272
273 urb->transfer_buffer_length = len; /* set to actual payload len */
274 ret = usb_submit_urb(urb, GFP_ATOMIC);
275 if (ret) {
276 udl_urb_completion(urb); /* because no one else will */
277 atomic_set(&udl->lost_pixels, 1);
278 DRM_ERROR("usb_submit_urb error %x\n", ret);
279 }
280 return ret;
281}
282
283int udl_driver_load(struct drm_device *dev, unsigned long flags)
284{
285 struct usb_device *udev = (void*)flags;
286 struct udl_device *udl;
287 int ret = -ENOMEM;
288
289 DRM_DEBUG("\n");
290 udl = kzalloc(sizeof(struct udl_device), GFP_KERNEL);
291 if (!udl)
292 return -ENOMEM;
293
294 udl->udev = udev;
295 udl->ddev = dev;
296 dev->dev_private = udl;
297
298 if (!udl_parse_vendor_descriptor(dev, udl->udev)) {
299 ret = -ENODEV;
300 DRM_ERROR("firmware not recognized. Assume incompatible device\n");
301 goto err;
302 }
303
304 if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
305 DRM_ERROR("udl_alloc_urb_list failed\n");
306 goto err;
307 }
308
309 DRM_DEBUG("\n");
310 ret = udl_modeset_init(dev);
311 if (ret)
312 goto err;
313
314 ret = udl_fbdev_init(dev);
315 if (ret)
316 goto err;
317
318 ret = drm_vblank_init(dev, 1);
319 if (ret)
320 goto err_fb;
321
322 return 0;
323err_fb:
324 udl_fbdev_cleanup(dev);
325err:
326 if (udl->urbs.count)
327 udl_free_urb_list(dev);
328 kfree(udl);
329 DRM_ERROR("%d\n", ret);
330 return ret;
331}
332
333int udl_drop_usb(struct drm_device *dev)
334{
335 udl_free_urb_list(dev);
336 return 0;
337}
338
339int udl_driver_unload(struct drm_device *dev)
340{
341 struct udl_device *udl = dev->dev_private;
342
343 drm_vblank_cleanup(dev);
344
345 if (udl->urbs.count)
346 udl_free_urb_list(dev);
347
348 udl_fbdev_cleanup(dev);
349 udl_modeset_cleanup(dev);
350 kfree(udl);
351 return 0;
352}
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 <drm/drm_crtc_helper.h>
15#include "udl_drv.h"
16
17/* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
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 = dev->dev_private;
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, /* vendor specific */
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) || /* descriptor length */
51 (desc[1] != 0x5f) || /* vendor descriptor type */
52 (desc[2] != 0x01) || /* version (2 bytes) */
53 (desc[3] != 0x00) ||
54 (desc[4] != total_len - 2)) /* length after type */
55 goto unrecognized;
56
57 desc_end = desc + total_len;
58 desc += 5; /* the fixed header we've already parsed */
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: { /* max_area */
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 /* allow udlfb to load for now even if firmware unrecognized */
89 DRM_ERROR("Unrecognized vendor firmware descriptor\n");
90
91success:
92 kfree(buf);
93 return true;
94}
95
96/*
97 * Need to ensure a channel is selected before submitting URBs
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 /* sync/async unlink faults aren't errors */
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 atomic_set(&udl->lost_pixels, 1);
144 }
145 }
146
147 urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */
148
149 spin_lock_irqsave(&udl->urbs.lock, flags);
150 list_add_tail(&unode->entry, &udl->urbs.list);
151 udl->urbs.available++;
152 spin_unlock_irqrestore(&udl->urbs.lock, flags);
153
154#if 0
155 /*
156 * When using fb_defio, we deadlock if up() is called
157 * while another is waiting. So queue to another process.
158 */
159 if (fb_defio)
160 schedule_delayed_work(&unode->release_urb_work, 0);
161 else
162#endif
163 up(&udl->urbs.limit_sem);
164}
165
166static void udl_free_urb_list(struct drm_device *dev)
167{
168 struct udl_device *udl = dev->dev_private;
169 int count = udl->urbs.count;
170 struct list_head *node;
171 struct urb_node *unode;
172 struct urb *urb;
173 int ret;
174 unsigned long flags;
175
176 DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
177
178 /* keep waiting and freeing, until we've got 'em all */
179 while (count--) {
180
181 /* Getting interrupted means a leak, but ok at shutdown*/
182 ret = down_interruptible(&udl->urbs.limit_sem);
183 if (ret)
184 break;
185
186 spin_lock_irqsave(&udl->urbs.lock, flags);
187
188 node = udl->urbs.list.next; /* have reserved one with sem */
189 list_del_init(node);
190
191 spin_unlock_irqrestore(&udl->urbs.lock, flags);
192
193 unode = list_entry(node, struct urb_node, entry);
194 urb = unode->urb;
195
196 /* Free each separately allocated piece */
197 usb_free_coherent(urb->dev, udl->urbs.size,
198 urb->transfer_buffer, urb->transfer_dma);
199 usb_free_urb(urb);
200 kfree(node);
201 }
202 udl->urbs.count = 0;
203}
204
205static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
206{
207 struct udl_device *udl = dev->dev_private;
208 int i = 0;
209 struct urb *urb;
210 struct urb_node *unode;
211 char *buf;
212
213 spin_lock_init(&udl->urbs.lock);
214
215 udl->urbs.size = size;
216 INIT_LIST_HEAD(&udl->urbs.list);
217
218 while (i < count) {
219 unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
220 if (!unode)
221 break;
222 unode->dev = udl;
223
224 INIT_DELAYED_WORK(&unode->release_urb_work,
225 udl_release_urb_work);
226
227 urb = usb_alloc_urb(0, GFP_KERNEL);
228 if (!urb) {
229 kfree(unode);
230 break;
231 }
232 unode->urb = urb;
233
234 buf = usb_alloc_coherent(udl->udev, MAX_TRANSFER, GFP_KERNEL,
235 &urb->transfer_dma);
236 if (!buf) {
237 kfree(unode);
238 usb_free_urb(urb);
239 break;
240 }
241
242 /* urb->transfer_buffer_length set to actual before submit */
243 usb_fill_bulk_urb(urb, udl->udev, usb_sndbulkpipe(udl->udev, 1),
244 buf, size, udl_urb_completion, unode);
245 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
246
247 list_add_tail(&unode->entry, &udl->urbs.list);
248
249 i++;
250 }
251
252 sema_init(&udl->urbs.limit_sem, i);
253 udl->urbs.count = i;
254 udl->urbs.available = i;
255
256 DRM_DEBUG("allocated %d %d byte urbs\n", i, (int) size);
257
258 return i;
259}
260
261struct urb *udl_get_urb(struct drm_device *dev)
262{
263 struct udl_device *udl = dev->dev_private;
264 int ret = 0;
265 struct list_head *entry;
266 struct urb_node *unode;
267 struct urb *urb = NULL;
268 unsigned long flags;
269
270 /* Wait for an in-flight buffer to complete and get re-queued */
271 ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
272 if (ret) {
273 atomic_set(&udl->lost_pixels, 1);
274 DRM_INFO("wait for urb interrupted: %x available: %d\n",
275 ret, udl->urbs.available);
276 goto error;
277 }
278
279 spin_lock_irqsave(&udl->urbs.lock, flags);
280
281 BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */
282 entry = udl->urbs.list.next;
283 list_del_init(entry);
284 udl->urbs.available--;
285
286 spin_unlock_irqrestore(&udl->urbs.lock, flags);
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 = dev->dev_private;
298 int ret;
299
300 BUG_ON(len > udl->urbs.size);
301
302 urb->transfer_buffer_length = len; /* set to actual payload len */
303 ret = usb_submit_urb(urb, GFP_ATOMIC);
304 if (ret) {
305 udl_urb_completion(urb); /* because no one else will */
306 atomic_set(&udl->lost_pixels, 1);
307 DRM_ERROR("usb_submit_urb error %x\n", ret);
308 }
309 return ret;
310}
311
312int udl_driver_load(struct drm_device *dev, unsigned long flags)
313{
314 struct usb_device *udev = (void*)flags;
315 struct udl_device *udl;
316 int ret = -ENOMEM;
317
318 DRM_DEBUG("\n");
319 udl = kzalloc(sizeof(struct udl_device), GFP_KERNEL);
320 if (!udl)
321 return -ENOMEM;
322
323 udl->udev = udev;
324 udl->ddev = dev;
325 dev->dev_private = udl;
326
327 if (!udl_parse_vendor_descriptor(dev, udl->udev)) {
328 ret = -ENODEV;
329 DRM_ERROR("firmware not recognized. Assume incompatible device\n");
330 goto err;
331 }
332
333 if (udl_select_std_channel(udl))
334 DRM_ERROR("Selecting channel failed\n");
335
336 if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
337 DRM_ERROR("udl_alloc_urb_list failed\n");
338 goto err;
339 }
340
341 DRM_DEBUG("\n");
342 ret = udl_modeset_init(dev);
343 if (ret)
344 goto err;
345
346 ret = udl_fbdev_init(dev);
347 if (ret)
348 goto err;
349
350 ret = drm_vblank_init(dev, 1);
351 if (ret)
352 goto err_fb;
353
354 drm_kms_helper_poll_init(dev);
355
356 return 0;
357err_fb:
358 udl_fbdev_cleanup(dev);
359err:
360 if (udl->urbs.count)
361 udl_free_urb_list(dev);
362 kfree(udl);
363 DRM_ERROR("%d\n", ret);
364 return ret;
365}
366
367int udl_drop_usb(struct drm_device *dev)
368{
369 udl_free_urb_list(dev);
370 return 0;
371}
372
373void udl_driver_unload(struct drm_device *dev)
374{
375 struct udl_device *udl = dev->dev_private;
376
377 drm_kms_helper_poll_fini(dev);
378
379 if (udl->urbs.count)
380 udl_free_urb_list(dev);
381
382 udl_fbdev_cleanup(dev);
383 udl_modeset_cleanup(dev);
384 kfree(udl);
385}