[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / gpu / drm / udl / udl_main.c

/*
 * Copyright (C) 2012 Red Hat
 *
 * based in parts on udlfb.c:
 * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
 * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License v2. See the file COPYING in the main directory of this archive for
 * more details.
 */
#include <drm/drmP.h>
#include "udl_drv.h"

/* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
#define BULK_SIZE 512

#define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
#define WRITES_IN_FLIGHT (4)
#define MAX_VENDOR_DESCRIPTOR_SIZE 256

#define GET_URB_TIMEOUT	HZ
#define FREE_URB_TIMEOUT (HZ*2)

static int udl_parse_vendor_descriptor(struct drm_device *dev,
				       struct usb_device *usbdev)
{
	struct udl_device *udl = dev->dev_private;
	char *desc;
	char *buf;
	char *desc_end;

	u8 total_len = 0;

	buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
	if (!buf)
		return false;
	desc = buf;

	total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */
				    0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
	if (total_len > 5) {
		DRM_INFO("vendor descriptor length:%x data:%02x %02x %02x %02x" \
			"%02x %02x %02x %02x %02x %02x %02x\n",
			total_len, desc[0],
			desc[1], desc[2], desc[3], desc[4], desc[5], desc[6],
			desc[7], desc[8], desc[9], desc[10]);

		if ((desc[0] != total_len) || /* descriptor length */
		    (desc[1] != 0x5f) ||   /* vendor descriptor type */
		    (desc[2] != 0x01) ||   /* version (2 bytes) */
		    (desc[3] != 0x00) ||
		    (desc[4] != total_len - 2)) /* length after type */
			goto unrecognized;

		desc_end = desc + total_len;
		desc += 5; /* the fixed header we've already parsed */

		while (desc < desc_end) {
			u8 length;
			u16 key;

			key = le16_to_cpu(*((u16 *) desc));
			desc += sizeof(u16);
			length = *desc;
			desc++;

			switch (key) {
			case 0x0200: { /* max_area */
				u32 max_area;
				max_area = le32_to_cpu(*((u32 *)desc));
				DRM_DEBUG("DL chip limited to %d pixel modes\n",
					max_area);
				udl->sku_pixel_limit = max_area;
				break;
			}
			default:
				break;
			}
			desc += length;
		}
	}

	goto success;

unrecognized:
	/* allow udlfb to load for now even if firmware unrecognized */
	DRM_ERROR("Unrecognized vendor firmware descriptor\n");

success:
	kfree(buf);
	return true;
}

static void udl_release_urb_work(struct work_struct *work)
{
	struct urb_node *unode = container_of(work, struct urb_node,
					      release_urb_work.work);

	up(&unode->dev->urbs.limit_sem);
}

void udl_urb_completion(struct urb *urb)
{
	struct urb_node *unode = urb->context;
	struct udl_device *udl = unode->dev;
	unsigned long flags;

	/* sync/async unlink faults aren't errors */
	if (urb->status) {
		if (!(urb->status == -ENOENT ||
		    urb->status == -ECONNRESET ||
		    urb->status == -ESHUTDOWN)) {
			DRM_ERROR("%s - nonzero write bulk status received: %d\n",
				__func__, urb->status);
			atomic_set(&udl->lost_pixels, 1);
		}
	}

	urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */

	spin_lock_irqsave(&udl->urbs.lock, flags);
	list_add_tail(&unode->entry, &udl->urbs.list);
	udl->urbs.available++;
	spin_unlock_irqrestore(&udl->urbs.lock, flags);

#if 0
	/*
	 * When using fb_defio, we deadlock if up() is called
	 * while another is waiting. So queue to another process.
	 */
	if (fb_defio)
		schedule_delayed_work(&unode->release_urb_work, 0);
	else
#endif
		up(&udl->urbs.limit_sem);
}

static void udl_free_urb_list(struct drm_device *dev)
{
	struct udl_device *udl = dev->dev_private;
	int count = udl->urbs.count;
	struct list_head *node;
	struct urb_node *unode;
	struct urb *urb;
	int ret;
	unsigned long flags;

	DRM_DEBUG("Waiting for completes and freeing all render urbs\n");

	/* keep waiting and freeing, until we've got 'em all */
	while (count--) {

		/* Getting interrupted means a leak, but ok at shutdown*/
		ret = down_interruptible(&udl->urbs.limit_sem);
		if (ret)
			break;

		spin_lock_irqsave(&udl->urbs.lock, flags);

		node = udl->urbs.list.next; /* have reserved one with sem */
		list_del_init(node);

		spin_unlock_irqrestore(&udl->urbs.lock, flags);

		unode = list_entry(node, struct urb_node, entry);
		urb = unode->urb;

		/* Free each separately allocated piece */
		usb_free_coherent(urb->dev, udl->urbs.size,
				  urb->transfer_buffer, urb->transfer_dma);
		usb_free_urb(urb);
		kfree(node);
	}
	udl->urbs.count = 0;
}

static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
{
	struct udl_device *udl = dev->dev_private;
	int i = 0;
	struct urb *urb;
	struct urb_node *unode;
	char *buf;

	spin_lock_init(&udl->urbs.lock);

	udl->urbs.size = size;
	INIT_LIST_HEAD(&udl->urbs.list);

	while (i < count) {
		unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
		if (!unode)
			break;
		unode->dev = udl;

		INIT_DELAYED_WORK(&unode->release_urb_work,
			  udl_release_urb_work);

		urb = usb_alloc_urb(0, GFP_KERNEL);
		if (!urb) {
			kfree(unode);
			break;
		}
		unode->urb = urb;

		buf = usb_alloc_coherent(udl->ddev->usbdev, MAX_TRANSFER, GFP_KERNEL,
					 &urb->transfer_dma);
		if (!buf) {
			kfree(unode);
			usb_free_urb(urb);
			break;
		}

		/* urb->transfer_buffer_length set to actual before submit */
		usb_fill_bulk_urb(urb, udl->ddev->usbdev, usb_sndbulkpipe(udl->ddev->usbdev, 1),
			buf, size, udl_urb_completion, unode);
		urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

		list_add_tail(&unode->entry, &udl->urbs.list);

		i++;
	}

	sema_init(&udl->urbs.limit_sem, i);
	udl->urbs.count = i;
	udl->urbs.available = i;

	DRM_DEBUG("allocated %d %d byte urbs\n", i, (int) size);

	return i;
}

struct urb *udl_get_urb(struct drm_device *dev)
{
	struct udl_device *udl = dev->dev_private;
	int ret = 0;
	struct list_head *entry;
	struct urb_node *unode;
	struct urb *urb = NULL;
	unsigned long flags;

	/* Wait for an in-flight buffer to complete and get re-queued */
	ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
	if (ret) {
		atomic_set(&udl->lost_pixels, 1);
		DRM_INFO("wait for urb interrupted: %x available: %d\n",
		       ret, udl->urbs.available);
		goto error;
	}

	spin_lock_irqsave(&udl->urbs.lock, flags);

	BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */
	entry = udl->urbs.list.next;
	list_del_init(entry);
	udl->urbs.available--;

	spin_unlock_irqrestore(&udl->urbs.lock, flags);

	unode = list_entry(entry, struct urb_node, entry);
	urb = unode->urb;

error:
	return urb;
}

int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
{
	struct udl_device *udl = dev->dev_private;
	int ret;

	BUG_ON(len > udl->urbs.size);

	urb->transfer_buffer_length = len; /* set to actual payload len */
	ret = usb_submit_urb(urb, GFP_ATOMIC);
	if (ret) {
		udl_urb_completion(urb); /* because no one else will */
		atomic_set(&udl->lost_pixels, 1);
		DRM_ERROR("usb_submit_urb error %x\n", ret);
	}
	return ret;
}

int udl_driver_load(struct drm_device *dev, unsigned long flags)
{
	struct udl_device *udl;
	int ret;

	DRM_DEBUG("\n");
	udl = kzalloc(sizeof(struct udl_device), GFP_KERNEL);
	if (!udl)
		return -ENOMEM;

	udl->ddev = dev;
	dev->dev_private = udl;

	if (!udl_parse_vendor_descriptor(dev, dev->usbdev)) {
		DRM_ERROR("firmware not recognized. Assume incompatible device\n");
		goto err;
	}

	if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
		ret = -ENOMEM;
		DRM_ERROR("udl_alloc_urb_list failed\n");
		goto err;
	}

	DRM_DEBUG("\n");
	ret = udl_modeset_init(dev);

	ret = udl_fbdev_init(dev);
	return 0;
err:
	kfree(udl);
	DRM_ERROR("%d\n", ret);
	return ret;
}

int udl_drop_usb(struct drm_device *dev)
{
	udl_free_urb_list(dev);
	return 0;
}

int udl_driver_unload(struct drm_device *dev)
{
	struct udl_device *udl = dev->dev_private;

	if (udl->urbs.count)
		udl_free_urb_list(dev);

	udl_fbdev_cleanup(dev);
	udl_modeset_cleanup(dev);
	kfree(udl);
	return 0;
}
Commit	Line	Data
5320918b DA	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	*/
760285e7	13	#include <drm/drmP.h>
5320918b DA	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
	26	static 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:%02x %02x %02x %02x" \
	45	"%02x %02x %02x %02x %02x %02x %02x\n",
	46	total_len, desc[0],
	47	desc[1], desc[2], desc[3], desc[4], desc[5], desc[6],
	48	desc[7], desc[8], desc[9], desc[10]);
	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
d42f0349	64	key = le16_to_cpu(((u16 ) desc));
5320918b DA	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
	87	unrecognized:
	88	/* allow udlfb to load for now even if firmware unrecognized */
	89	DRM_ERROR("Unrecognized vendor firmware descriptor\n");
	90
	91	success:
	92	kfree(buf);
	93	return true;
	94	}
	95
	96	static void udl_release_urb_work(struct work_struct *work)
	97	{
	98	struct urb_node *unode = container_of(work, struct urb_node,
	99	release_urb_work.work);
	100
	101	up(&unode->dev->urbs.limit_sem);
	102	}
	103
	104	void udl_urb_completion(struct urb *urb)
	105	{
	106	struct urb_node *unode = urb->context;
	107	struct udl_device *udl = unode->dev;
	108	unsigned long flags;
	109
	110	/* sync/async unlink faults aren't errors */
	111	if (urb->status) {
	112	if (!(urb->status == -ENOENT \|\|
	113	urb->status == -ECONNRESET \|\|
	114	urb->status == -ESHUTDOWN)) {
	115	DRM_ERROR("%s - nonzero write bulk status received: %d\n",
	116	__func__, urb->status);
	117	atomic_set(&udl->lost_pixels, 1);
	118	}
	119	}
	120
	121	urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */
	122
	123	spin_lock_irqsave(&udl->urbs.lock, flags);
	124	list_add_tail(&unode->entry, &udl->urbs.list);
	125	udl->urbs.available++;
	126	spin_unlock_irqrestore(&udl->urbs.lock, flags);
	127
	128	#if 0
129	/*
130	* When using fb_defio, we deadlock if up() is called
131	* while another is waiting. So queue to another process.
132	*/
133	if (fb_defio)
134	schedule_delayed_work(&unode->release_urb_work, 0);
135	else
136	#endif
137	up(&udl->urbs.limit_sem);
138	}
139
140	static void udl_free_urb_list(struct drm_device *dev)
141	{
142	struct udl_device *udl = dev->dev_private;
143	int count = udl->urbs.count;
144	struct list_head *node;
145	struct urb_node *unode;
146	struct urb *urb;
147	int ret;
148	unsigned long flags;
149
150	DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
151
152	/* keep waiting and freeing, until we've got 'em all */
153	while (count--) {
154
155	/* Getting interrupted means a leak, but ok at shutdown*/
156	ret = down_interruptible(&udl->urbs.limit_sem);
157	if (ret)
158	break;
159
160	spin_lock_irqsave(&udl->urbs.lock, flags);
161
162	node = udl->urbs.list.next; /* have reserved one with sem */
163	list_del_init(node);
164
165	spin_unlock_irqrestore(&udl->urbs.lock, flags);
166
167	unode = list_entry(node, struct urb_node, entry);
168	urb = unode->urb;
169
170	/* Free each separately allocated piece */
171	usb_free_coherent(urb->dev, udl->urbs.size,
172	urb->transfer_buffer, urb->transfer_dma);
173	usb_free_urb(urb);
174	kfree(node);
175	}
176	udl->urbs.count = 0;
177	}
178
179	static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
180	{
181	struct udl_device *udl = dev->dev_private;
182	int i = 0;
183	struct urb *urb;
184	struct urb_node *unode;
185	char *buf;
186
187	spin_lock_init(&udl->urbs.lock);
188
189	udl->urbs.size = size;
190	INIT_LIST_HEAD(&udl->urbs.list);
191
192	while (i < count) {
193	unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
194	if (!unode)
195	break;
196	unode->dev = udl;
197
198	INIT_DELAYED_WORK(&unode->release_urb_work,
199	udl_release_urb_work);
200
201	urb = usb_alloc_urb(0, GFP_KERNEL);
202	if (!urb) {
203	kfree(unode);
204	break;
205	}
206	unode->urb = urb;
207
208	buf = usb_alloc_coherent(udl->ddev->usbdev, MAX_TRANSFER, GFP_KERNEL,
209	&urb->transfer_dma);
210	if (!buf) {
211	kfree(unode);
212	usb_free_urb(urb);
213	break;
214	}
215
216	/* urb->transfer_buffer_length set to actual before submit */
217	usb_fill_bulk_urb(urb, udl->ddev->usbdev, usb_sndbulkpipe(udl->ddev->usbdev, 1),
218	buf, size, udl_urb_completion, unode);
219	urb->transfer_flags \|= URB_NO_TRANSFER_DMA_MAP;
220
221	list_add_tail(&unode->entry, &udl->urbs.list);
222
223	i++;
224	}
225
226	sema_init(&udl->urbs.limit_sem, i);
227	udl->urbs.count = i;
228	udl->urbs.available = i;
229
230	DRM_DEBUG("allocated %d %d byte urbs\n", i, (int) size);
231
232	return i;
233	}
234
235	struct urb udl_get_urb(struct drm_device dev)
236	{
237	struct udl_device *udl = dev->dev_private;
238	int ret = 0;
239	struct list_head *entry;
240	struct urb_node *unode;
241	struct urb *urb = NULL;
242	unsigned long flags;
243
244	/* Wait for an in-flight buffer to complete and get re-queued */
245	ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
246	if (ret) {
247	atomic_set(&udl->lost_pixels, 1);
248	DRM_INFO("wait for urb interrupted: %x available: %d\n",
249	ret, udl->urbs.available);
250	goto error;
251	}
252
253	spin_lock_irqsave(&udl->urbs.lock, flags);
254
255	BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */
256	entry = udl->urbs.list.next;
257	list_del_init(entry);
258	udl->urbs.available--;
259
260	spin_unlock_irqrestore(&udl->urbs.lock, flags);
261
262	unode = list_entry(entry, struct urb_node, entry);
263	urb = unode->urb;
264
265	error:
266	return urb;
267	}
268
269	int udl_submit_urb(struct drm_device dev, struct urb urb, size_t len)
270	{
271	struct udl_device *udl = dev->dev_private;
272	int ret;
273
274	BUG_ON(len > udl->urbs.size);
275
276	urb->transfer_buffer_length = len; /* set to actual payload len */
277	ret = usb_submit_urb(urb, GFP_ATOMIC);
278	if (ret) {
279	udl_urb_completion(urb); /* because no one else will */
280	atomic_set(&udl->lost_pixels, 1);
281	DRM_ERROR("usb_submit_urb error %x\n", ret);
282	}
283	return ret;
284	}
285
286	int udl_driver_load(struct drm_device *dev, unsigned long flags)
287	{
288	struct udl_device *udl;
289	int ret;
290
291	DRM_DEBUG("\n");
292	udl = kzalloc(sizeof(struct udl_device), GFP_KERNEL);
293	if (!udl)
294	return -ENOMEM;
295
296	udl->ddev = dev;
297	dev->dev_private = udl;
298
299	if (!udl_parse_vendor_descriptor(dev, dev->usbdev)) {
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	ret = -ENOMEM;
306	DRM_ERROR("udl_alloc_urb_list failed\n");
307	goto err;
308	}
309
310	DRM_DEBUG("\n");
311	ret = udl_modeset_init(dev);
312
313	ret = udl_fbdev_init(dev);
314	return 0;
315	err:
316	kfree(udl);
317	DRM_ERROR("%d\n", ret);
318	return ret;
319	}
320
321	int udl_drop_usb(struct drm_device *dev)
322	{
323	udl_free_urb_list(dev);
324	return 0;
325	}
326
327	int udl_driver_unload(struct drm_device *dev)
328	{
329	struct udl_device *udl = dev->dev_private;
330
331	if (udl->urbs.count)
332	udl_free_urb_list(dev);
333
334	udl_fbdev_cleanup(dev);
335	udl_modeset_cleanup(dev);
336	kfree(udl);
337	return 0;
338	}