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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2012 Red Hat
4 *
5 * based in parts on udlfb.c:
6 * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
7 * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
8 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
9 */
10
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/* -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 = 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, /* 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 = to_udl(dev);
169 int count = udl->urbs.count;
170 struct list_head *node;
171 struct urb_node *unode;
172 struct urb *urb;
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_irq(&udl->urbs.lock);
181
182 node = udl->urbs.list.next; /* have reserved one with sem */
183 list_del_init(node);
184
185 spin_unlock_irq(&udl->urbs.lock);
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
199static 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
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(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
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 /* Wait for an in-flight buffer to complete and get re-queued */
272 ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
273 if (ret) {
274 atomic_set(&udl->lost_pixels, 1);
275 DRM_INFO("wait for urb interrupted: %x available: %d\n",
276 ret, udl->urbs.available);
277 goto error;
278 }
279
280 spin_lock_irq(&udl->urbs.lock);
281
282 BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */
283 entry = udl->urbs.list.next;
284 list_del_init(entry);
285 udl->urbs.available--;
286
287 spin_unlock_irq(&udl->urbs.lock);
288
289 unode = list_entry(entry, struct urb_node, entry);
290 urb = unode->urb;
291
292error:
293 return urb;
294}
295
296int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
297{
298 struct udl_device *udl = to_udl(dev);
299 int ret;
300
301 BUG_ON(len > udl->urbs.size);
302
303 urb->transfer_buffer_length = len; /* set to actual payload len */
304 ret = usb_submit_urb(urb, GFP_ATOMIC);
305 if (ret) {
306 udl_urb_completion(urb); /* because no one else will */
307 atomic_set(&udl->lost_pixels, 1);
308 DRM_ERROR("usb_submit_urb error %x\n", ret);
309 }
310 return ret;
311}
312
313int udl_init(struct udl_device *udl)
314{
315 struct drm_device *dev = &udl->drm;
316 int ret = -ENOMEM;
317
318 DRM_DEBUG("\n");
319
320 mutex_init(&udl->gem_lock);
321
322 if (!udl_parse_vendor_descriptor(dev, udl->udev)) {
323 ret = -ENODEV;
324 DRM_ERROR("firmware not recognized. Assume incompatible device\n");
325 goto err;
326 }
327
328 if (udl_select_std_channel(udl))
329 DRM_ERROR("Selecting channel failed\n");
330
331 if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
332 DRM_ERROR("udl_alloc_urb_list failed\n");
333 goto err;
334 }
335
336 DRM_DEBUG("\n");
337 ret = udl_modeset_init(dev);
338 if (ret)
339 goto err;
340
341 ret = udl_fbdev_init(dev);
342 if (ret)
343 goto err;
344
345 drm_kms_helper_poll_init(dev);
346
347 return 0;
348
349err:
350 if (udl->urbs.count)
351 udl_free_urb_list(dev);
352 DRM_ERROR("%d\n", ret);
353 return ret;
354}
355
356int udl_drop_usb(struct drm_device *dev)
357{
358 udl_free_urb_list(dev);
359 return 0;
360}
361
362void udl_fini(struct drm_device *dev)
363{
364 struct udl_device *udl = to_udl(dev);
365
366 drm_kms_helper_poll_fini(dev);
367
368 if (udl->urbs.count)
369 udl_free_urb_list(dev);
370
371 udl_fbdev_cleanup(dev);
372}