blob: 6c984eacc7e350bf87a8a6078cb7f4fadc845d8c [file] [log] [blame]
Daniel Mack364dbdf2010-11-04 14:44:00 -04001/*
axel lin0b7f1cc2011-01-14 09:39:11 +00002 * pxa3xx-gcu.c - Linux kernel module for PXA3xx graphics controllers
Daniel Mack364dbdf2010-11-04 14:44:00 -04003 *
4 * This driver needs a DirectFB counterpart in user space, communication
5 * is handled via mmap()ed memory areas and an ioctl.
6 *
7 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
8 * Copyright (c) 2009 Janine Kropp <nin@directfb.org>
9 * Copyright (c) 2009 Denis Oliver Kropp <dok@directfb.org>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26/*
27 * WARNING: This controller is attached to System Bus 2 of the PXA which
Lucas De Marchi25985ed2011-03-30 22:57:33 -030028 * needs its arbiter to be enabled explicitly (CKENB & 1<<9).
Daniel Mack364dbdf2010-11-04 14:44:00 -040029 * There is currently no way to do this from Linux, so you need to teach
30 * your bootloader for now.
31 */
32
33#include <linux/module.h>
Daniel Mack364dbdf2010-11-04 14:44:00 -040034#include <linux/platform_device.h>
35#include <linux/dma-mapping.h>
36#include <linux/miscdevice.h>
37#include <linux/interrupt.h>
38#include <linux/spinlock.h>
39#include <linux/uaccess.h>
40#include <linux/ioctl.h>
41#include <linux/delay.h>
42#include <linux/sched.h>
43#include <linux/slab.h>
44#include <linux/clk.h>
45#include <linux/fs.h>
46#include <linux/io.h>
47
48#include "pxa3xx-gcu.h"
49
50#define DRV_NAME "pxa3xx-gcu"
51#define MISCDEV_MINOR 197
52
53#define REG_GCCR 0x00
54#define GCCR_SYNC_CLR (1 << 9)
55#define GCCR_BP_RST (1 << 8)
56#define GCCR_ABORT (1 << 6)
57#define GCCR_STOP (1 << 4)
58
59#define REG_GCISCR 0x04
60#define REG_GCIECR 0x08
61#define REG_GCRBBR 0x20
62#define REG_GCRBLR 0x24
63#define REG_GCRBHR 0x28
64#define REG_GCRBTR 0x2C
65#define REG_GCRBEXHR 0x30
66
67#define IE_EOB (1 << 0)
68#define IE_EEOB (1 << 5)
69#define IE_ALL 0xff
70
71#define SHARED_SIZE PAGE_ALIGN(sizeof(struct pxa3xx_gcu_shared))
72
73/* #define PXA3XX_GCU_DEBUG */
74/* #define PXA3XX_GCU_DEBUG_TIMER */
75
76#ifdef PXA3XX_GCU_DEBUG
77#define QDUMP(msg) \
78 do { \
79 QPRINT(priv, KERN_DEBUG, msg); \
80 } while (0)
81#else
82#define QDUMP(msg) do {} while (0)
83#endif
84
85#define QERROR(msg) \
86 do { \
87 QPRINT(priv, KERN_ERR, msg); \
88 } while (0)
89
90struct pxa3xx_gcu_batch {
91 struct pxa3xx_gcu_batch *next;
92 u32 *ptr;
93 dma_addr_t phys;
94 unsigned long length;
95};
96
97struct pxa3xx_gcu_priv {
98 void __iomem *mmio_base;
99 struct clk *clk;
100 struct pxa3xx_gcu_shared *shared;
101 dma_addr_t shared_phys;
102 struct resource *resource_mem;
103 struct miscdevice misc_dev;
104 struct file_operations misc_fops;
105 wait_queue_head_t wait_idle;
106 wait_queue_head_t wait_free;
107 spinlock_t spinlock;
108 struct timeval base_time;
109
110 struct pxa3xx_gcu_batch *free;
111
112 struct pxa3xx_gcu_batch *ready;
113 struct pxa3xx_gcu_batch *ready_last;
114 struct pxa3xx_gcu_batch *running;
115};
116
117static inline unsigned long
118gc_readl(struct pxa3xx_gcu_priv *priv, unsigned int off)
119{
120 return __raw_readl(priv->mmio_base + off);
121}
122
123static inline void
124gc_writel(struct pxa3xx_gcu_priv *priv, unsigned int off, unsigned long val)
125{
126 __raw_writel(val, priv->mmio_base + off);
127}
128
129#define QPRINT(priv, level, msg) \
130 do { \
131 struct timeval tv; \
132 struct pxa3xx_gcu_shared *shared = priv->shared; \
133 u32 base = gc_readl(priv, REG_GCRBBR); \
134 \
135 do_gettimeofday(&tv); \
136 \
137 printk(level "%ld.%03ld.%03ld - %-17s: %-21s (%s, " \
138 "STATUS " \
139 "0x%02lx, B 0x%08lx [%ld], E %5ld, H %5ld, " \
140 "T %5ld)\n", \
141 tv.tv_sec - priv->base_time.tv_sec, \
142 tv.tv_usec / 1000, tv.tv_usec % 1000, \
143 __func__, msg, \
144 shared->hw_running ? "running" : " idle", \
145 gc_readl(priv, REG_GCISCR), \
146 gc_readl(priv, REG_GCRBBR), \
147 gc_readl(priv, REG_GCRBLR), \
148 (gc_readl(priv, REG_GCRBEXHR) - base) / 4, \
149 (gc_readl(priv, REG_GCRBHR) - base) / 4, \
150 (gc_readl(priv, REG_GCRBTR) - base) / 4); \
151 } while (0)
152
153static void
154pxa3xx_gcu_reset(struct pxa3xx_gcu_priv *priv)
155{
156 QDUMP("RESET");
157
158 /* disable interrupts */
159 gc_writel(priv, REG_GCIECR, 0);
160
161 /* reset hardware */
162 gc_writel(priv, REG_GCCR, GCCR_ABORT);
163 gc_writel(priv, REG_GCCR, 0);
164
165 memset(priv->shared, 0, SHARED_SIZE);
166 priv->shared->buffer_phys = priv->shared_phys;
167 priv->shared->magic = PXA3XX_GCU_SHARED_MAGIC;
168
169 do_gettimeofday(&priv->base_time);
170
171 /* set up the ring buffer pointers */
172 gc_writel(priv, REG_GCRBLR, 0);
173 gc_writel(priv, REG_GCRBBR, priv->shared_phys);
174 gc_writel(priv, REG_GCRBTR, priv->shared_phys);
175
176 /* enable all IRQs except EOB */
177 gc_writel(priv, REG_GCIECR, IE_ALL & ~IE_EOB);
178}
179
180static void
181dump_whole_state(struct pxa3xx_gcu_priv *priv)
182{
183 struct pxa3xx_gcu_shared *sh = priv->shared;
184 u32 base = gc_readl(priv, REG_GCRBBR);
185
186 QDUMP("DUMP");
187
188 printk(KERN_DEBUG "== PXA3XX-GCU DUMP ==\n"
189 "%s, STATUS 0x%02lx, B 0x%08lx [%ld], E %5ld, H %5ld, T %5ld\n",
190 sh->hw_running ? "running" : "idle ",
191 gc_readl(priv, REG_GCISCR),
192 gc_readl(priv, REG_GCRBBR),
193 gc_readl(priv, REG_GCRBLR),
194 (gc_readl(priv, REG_GCRBEXHR) - base) / 4,
195 (gc_readl(priv, REG_GCRBHR) - base) / 4,
196 (gc_readl(priv, REG_GCRBTR) - base) / 4);
197}
198
199static void
200flush_running(struct pxa3xx_gcu_priv *priv)
201{
202 struct pxa3xx_gcu_batch *running = priv->running;
203 struct pxa3xx_gcu_batch *next;
204
205 while (running) {
206 next = running->next;
207 running->next = priv->free;
208 priv->free = running;
209 running = next;
210 }
211
212 priv->running = NULL;
213}
214
215static void
216run_ready(struct pxa3xx_gcu_priv *priv)
217{
218 unsigned int num = 0;
219 struct pxa3xx_gcu_shared *shared = priv->shared;
220 struct pxa3xx_gcu_batch *ready = priv->ready;
221
222 QDUMP("Start");
223
224 BUG_ON(!ready);
225
226 shared->buffer[num++] = 0x05000000;
227
228 while (ready) {
229 shared->buffer[num++] = 0x00000001;
230 shared->buffer[num++] = ready->phys;
231 ready = ready->next;
232 }
233
234 shared->buffer[num++] = 0x05000000;
235 priv->running = priv->ready;
236 priv->ready = priv->ready_last = NULL;
237 gc_writel(priv, REG_GCRBLR, 0);
238 shared->hw_running = 1;
239
240 /* ring base address */
241 gc_writel(priv, REG_GCRBBR, shared->buffer_phys);
242
243 /* ring tail address */
244 gc_writel(priv, REG_GCRBTR, shared->buffer_phys + num * 4);
245
246 /* ring length */
247 gc_writel(priv, REG_GCRBLR, ((num + 63) & ~63) * 4);
248}
249
250static irqreturn_t
251pxa3xx_gcu_handle_irq(int irq, void *ctx)
252{
253 struct pxa3xx_gcu_priv *priv = ctx;
254 struct pxa3xx_gcu_shared *shared = priv->shared;
255 u32 status = gc_readl(priv, REG_GCISCR) & IE_ALL;
256
257 QDUMP("-Interrupt");
258
259 if (!status)
260 return IRQ_NONE;
261
262 spin_lock(&priv->spinlock);
263 shared->num_interrupts++;
264
265 if (status & IE_EEOB) {
266 QDUMP(" [EEOB]");
267
268 flush_running(priv);
269 wake_up_all(&priv->wait_free);
270
271 if (priv->ready) {
272 run_ready(priv);
273 } else {
274 /* There is no more data prepared by the userspace.
275 * Set hw_running = 0 and wait for the next userspace
276 * kick-off */
277 shared->num_idle++;
278 shared->hw_running = 0;
279
280 QDUMP(" '-> Idle.");
281
282 /* set ring buffer length to zero */
283 gc_writel(priv, REG_GCRBLR, 0);
284
285 wake_up_all(&priv->wait_idle);
286 }
287
288 shared->num_done++;
289 } else {
290 QERROR(" [???]");
291 dump_whole_state(priv);
292 }
293
294 /* Clear the interrupt */
295 gc_writel(priv, REG_GCISCR, status);
296 spin_unlock(&priv->spinlock);
297
298 return IRQ_HANDLED;
299}
300
301static int
302pxa3xx_gcu_wait_idle(struct pxa3xx_gcu_priv *priv)
303{
304 int ret = 0;
305
306 QDUMP("Waiting for idle...");
307
308 /* Does not need to be atomic. There's a lock in user space,
309 * but anyhow, this is just for statistics. */
310 priv->shared->num_wait_idle++;
311
312 while (priv->shared->hw_running) {
313 int num = priv->shared->num_interrupts;
314 u32 rbexhr = gc_readl(priv, REG_GCRBEXHR);
315
316 ret = wait_event_interruptible_timeout(priv->wait_idle,
317 !priv->shared->hw_running, HZ*4);
318
Axel Lin688ec342012-03-27 11:15:56 +0800319 if (ret != 0)
Daniel Mack364dbdf2010-11-04 14:44:00 -0400320 break;
321
Daniel Mack364dbdf2010-11-04 14:44:00 -0400322 if (gc_readl(priv, REG_GCRBEXHR) == rbexhr &&
323 priv->shared->num_interrupts == num) {
324 QERROR("TIMEOUT");
325 ret = -ETIMEDOUT;
326 break;
327 }
328 }
329
330 QDUMP("done");
331
332 return ret;
333}
334
335static int
336pxa3xx_gcu_wait_free(struct pxa3xx_gcu_priv *priv)
337{
338 int ret = 0;
339
340 QDUMP("Waiting for free...");
341
342 /* Does not need to be atomic. There's a lock in user space,
343 * but anyhow, this is just for statistics. */
344 priv->shared->num_wait_free++;
345
346 while (!priv->free) {
347 u32 rbexhr = gc_readl(priv, REG_GCRBEXHR);
348
349 ret = wait_event_interruptible_timeout(priv->wait_free,
350 priv->free, HZ*4);
351
352 if (ret < 0)
353 break;
354
355 if (ret > 0)
356 continue;
357
358 if (gc_readl(priv, REG_GCRBEXHR) == rbexhr) {
359 QERROR("TIMEOUT");
360 ret = -ETIMEDOUT;
361 break;
362 }
363 }
364
365 QDUMP("done");
366
367 return ret;
368}
369
370/* Misc device layer */
371
372static ssize_t
373pxa3xx_gcu_misc_write(struct file *filp, const char *buff,
374 size_t count, loff_t *offp)
375{
376 int ret;
377 unsigned long flags;
378 struct pxa3xx_gcu_batch *buffer;
379 struct pxa3xx_gcu_priv *priv =
380 container_of(filp->f_op, struct pxa3xx_gcu_priv, misc_fops);
381
382 int words = count / 4;
383
384 /* Does not need to be atomic. There's a lock in user space,
385 * but anyhow, this is just for statistics. */
386 priv->shared->num_writes++;
387
388 priv->shared->num_words += words;
389
390 /* Last word reserved for batch buffer end command */
391 if (words >= PXA3XX_GCU_BATCH_WORDS)
392 return -E2BIG;
393
394 /* Wait for a free buffer */
395 if (!priv->free) {
396 ret = pxa3xx_gcu_wait_free(priv);
397 if (ret < 0)
398 return ret;
399 }
400
401 /*
402 * Get buffer from free list
403 */
404 spin_lock_irqsave(&priv->spinlock, flags);
405
406 buffer = priv->free;
407 priv->free = buffer->next;
408
409 spin_unlock_irqrestore(&priv->spinlock, flags);
410
411
412 /* Copy data from user into buffer */
413 ret = copy_from_user(buffer->ptr, buff, words * 4);
414 if (ret) {
415 spin_lock_irqsave(&priv->spinlock, flags);
416 buffer->next = priv->free;
417 priv->free = buffer;
418 spin_unlock_irqrestore(&priv->spinlock, flags);
axel lin0b7f1cc2011-01-14 09:39:11 +0000419 return -EFAULT;
Daniel Mack364dbdf2010-11-04 14:44:00 -0400420 }
421
422 buffer->length = words;
423
424 /* Append batch buffer end command */
425 buffer->ptr[words] = 0x01000000;
426
427 /*
428 * Add buffer to ready list
429 */
430 spin_lock_irqsave(&priv->spinlock, flags);
431
432 buffer->next = NULL;
433
434 if (priv->ready) {
435 BUG_ON(priv->ready_last == NULL);
436
437 priv->ready_last->next = buffer;
438 } else
439 priv->ready = buffer;
440
441 priv->ready_last = buffer;
442
443 if (!priv->shared->hw_running)
444 run_ready(priv);
445
446 spin_unlock_irqrestore(&priv->spinlock, flags);
447
448 return words * 4;
449}
450
451
452static long
453pxa3xx_gcu_misc_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
454{
455 unsigned long flags;
456 struct pxa3xx_gcu_priv *priv =
457 container_of(filp->f_op, struct pxa3xx_gcu_priv, misc_fops);
458
459 switch (cmd) {
460 case PXA3XX_GCU_IOCTL_RESET:
461 spin_lock_irqsave(&priv->spinlock, flags);
462 pxa3xx_gcu_reset(priv);
463 spin_unlock_irqrestore(&priv->spinlock, flags);
464 return 0;
465
466 case PXA3XX_GCU_IOCTL_WAIT_IDLE:
467 return pxa3xx_gcu_wait_idle(priv);
468 }
469
470 return -ENOSYS;
471}
472
473static int
474pxa3xx_gcu_misc_mmap(struct file *filp, struct vm_area_struct *vma)
475{
476 unsigned int size = vma->vm_end - vma->vm_start;
477 struct pxa3xx_gcu_priv *priv =
478 container_of(filp->f_op, struct pxa3xx_gcu_priv, misc_fops);
479
480 switch (vma->vm_pgoff) {
481 case 0:
482 /* hand out the shared data area */
483 if (size != SHARED_SIZE)
484 return -EINVAL;
485
486 return dma_mmap_coherent(NULL, vma,
487 priv->shared, priv->shared_phys, size);
488
489 case SHARED_SIZE >> PAGE_SHIFT:
490 /* hand out the MMIO base for direct register access
491 * from userspace */
492 if (size != resource_size(priv->resource_mem))
493 return -EINVAL;
494
495 vma->vm_flags |= VM_IO;
496 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
497
498 return io_remap_pfn_range(vma, vma->vm_start,
499 priv->resource_mem->start >> PAGE_SHIFT,
500 size, vma->vm_page_prot);
501 }
502
503 return -EINVAL;
504}
505
506
507#ifdef PXA3XX_GCU_DEBUG_TIMER
508static struct timer_list pxa3xx_gcu_debug_timer;
509
510static void pxa3xx_gcu_debug_timedout(unsigned long ptr)
511{
512 struct pxa3xx_gcu_priv *priv = (struct pxa3xx_gcu_priv *) ptr;
513
514 QERROR("Timer DUMP");
515
516 /* init the timer structure */
517 init_timer(&pxa3xx_gcu_debug_timer);
518 pxa3xx_gcu_debug_timer.function = pxa3xx_gcu_debug_timedout;
519 pxa3xx_gcu_debug_timer.data = ptr;
520 pxa3xx_gcu_debug_timer.expires = jiffies + 5*HZ; /* one second */
521
522 add_timer(&pxa3xx_gcu_debug_timer);
523}
524
525static void pxa3xx_gcu_init_debug_timer(void)
526{
527 pxa3xx_gcu_debug_timedout((unsigned long) &pxa3xx_gcu_debug_timer);
528}
529#else
530static inline void pxa3xx_gcu_init_debug_timer(void) {}
531#endif
532
533static int
534add_buffer(struct platform_device *dev,
535 struct pxa3xx_gcu_priv *priv)
536{
537 struct pxa3xx_gcu_batch *buffer;
538
539 buffer = kzalloc(sizeof(struct pxa3xx_gcu_batch), GFP_KERNEL);
540 if (!buffer)
541 return -ENOMEM;
542
543 buffer->ptr = dma_alloc_coherent(&dev->dev, PXA3XX_GCU_BATCH_WORDS * 4,
544 &buffer->phys, GFP_KERNEL);
545 if (!buffer->ptr) {
546 kfree(buffer);
547 return -ENOMEM;
548 }
549
550 buffer->next = priv->free;
551
552 priv->free = buffer;
553
554 return 0;
555}
556
557static void
558free_buffers(struct platform_device *dev,
559 struct pxa3xx_gcu_priv *priv)
560{
561 struct pxa3xx_gcu_batch *next, *buffer = priv->free;
562
563 while (buffer) {
564 next = buffer->next;
565
566 dma_free_coherent(&dev->dev, PXA3XX_GCU_BATCH_WORDS * 4,
567 buffer->ptr, buffer->phys);
568
569 kfree(buffer);
570
571 buffer = next;
572 }
573
574 priv->free = NULL;
575}
576
Greg Kroah-Hartman48c68c42012-12-21 13:07:39 -0800577static int pxa3xx_gcu_probe(struct platform_device *dev)
Daniel Mack364dbdf2010-11-04 14:44:00 -0400578{
579 int i, ret, irq;
580 struct resource *r;
581 struct pxa3xx_gcu_priv *priv;
582
583 priv = kzalloc(sizeof(struct pxa3xx_gcu_priv), GFP_KERNEL);
584 if (!priv)
585 return -ENOMEM;
586
587 for (i = 0; i < 8; i++) {
588 ret = add_buffer(dev, priv);
589 if (ret) {
590 dev_err(&dev->dev, "failed to allocate DMA memory\n");
591 goto err_free_priv;
592 }
593 }
594
595 init_waitqueue_head(&priv->wait_idle);
596 init_waitqueue_head(&priv->wait_free);
597 spin_lock_init(&priv->spinlock);
598
599 /* we allocate the misc device structure as part of our own allocation,
600 * so we can get a pointer to our priv structure later on with
601 * container_of(). This isn't really necessary as we have a fixed minor
602 * number anyway, but this is to avoid statics. */
603
604 priv->misc_fops.owner = THIS_MODULE;
605 priv->misc_fops.write = pxa3xx_gcu_misc_write;
606 priv->misc_fops.unlocked_ioctl = pxa3xx_gcu_misc_ioctl;
607 priv->misc_fops.mmap = pxa3xx_gcu_misc_mmap;
608
609 priv->misc_dev.minor = MISCDEV_MINOR,
610 priv->misc_dev.name = DRV_NAME,
611 priv->misc_dev.fops = &priv->misc_fops,
612
613 /* register misc device */
614 ret = misc_register(&priv->misc_dev);
615 if (ret < 0) {
616 dev_err(&dev->dev, "misc_register() for minor %d failed\n",
617 MISCDEV_MINOR);
618 goto err_free_priv;
619 }
620
621 /* handle IO resources */
622 r = platform_get_resource(dev, IORESOURCE_MEM, 0);
623 if (r == NULL) {
624 dev_err(&dev->dev, "no I/O memory resource defined\n");
625 ret = -ENODEV;
626 goto err_misc_deregister;
627 }
628
629 if (!request_mem_region(r->start, resource_size(r), dev->name)) {
630 dev_err(&dev->dev, "failed to request I/O memory\n");
631 ret = -EBUSY;
632 goto err_misc_deregister;
633 }
634
635 priv->mmio_base = ioremap_nocache(r->start, resource_size(r));
636 if (!priv->mmio_base) {
637 dev_err(&dev->dev, "failed to map I/O memory\n");
638 ret = -EBUSY;
639 goto err_free_mem_region;
640 }
641
642 /* allocate dma memory */
643 priv->shared = dma_alloc_coherent(&dev->dev, SHARED_SIZE,
644 &priv->shared_phys, GFP_KERNEL);
645
646 if (!priv->shared) {
647 dev_err(&dev->dev, "failed to allocate DMA memory\n");
648 ret = -ENOMEM;
649 goto err_free_io;
650 }
651
652 /* enable the clock */
653 priv->clk = clk_get(&dev->dev, NULL);
654 if (IS_ERR(priv->clk)) {
655 dev_err(&dev->dev, "failed to get clock\n");
656 ret = -ENODEV;
657 goto err_free_dma;
658 }
659
660 ret = clk_enable(priv->clk);
661 if (ret < 0) {
662 dev_err(&dev->dev, "failed to enable clock\n");
663 goto err_put_clk;
664 }
665
666 /* request the IRQ */
667 irq = platform_get_irq(dev, 0);
668 if (irq < 0) {
669 dev_err(&dev->dev, "no IRQ defined\n");
670 ret = -ENODEV;
671 goto err_put_clk;
672 }
673
674 ret = request_irq(irq, pxa3xx_gcu_handle_irq,
Yong Zhangf8798cc2011-09-22 16:59:16 +0800675 0, DRV_NAME, priv);
Daniel Mack364dbdf2010-11-04 14:44:00 -0400676 if (ret) {
677 dev_err(&dev->dev, "request_irq failed\n");
678 ret = -EBUSY;
679 goto err_put_clk;
680 }
681
682 platform_set_drvdata(dev, priv);
683 priv->resource_mem = r;
684 pxa3xx_gcu_reset(priv);
685 pxa3xx_gcu_init_debug_timer();
686
687 dev_info(&dev->dev, "registered @0x%p, DMA 0x%p (%d bytes), IRQ %d\n",
688 (void *) r->start, (void *) priv->shared_phys,
689 SHARED_SIZE, irq);
690 return 0;
691
692err_put_clk:
693 clk_disable(priv->clk);
694 clk_put(priv->clk);
695
696err_free_dma:
697 dma_free_coherent(&dev->dev, SHARED_SIZE,
698 priv->shared, priv->shared_phys);
699
700err_free_io:
701 iounmap(priv->mmio_base);
702
703err_free_mem_region:
704 release_mem_region(r->start, resource_size(r));
705
706err_misc_deregister:
707 misc_deregister(&priv->misc_dev);
708
709err_free_priv:
710 platform_set_drvdata(dev, NULL);
711 free_buffers(dev, priv);
712 kfree(priv);
713 return ret;
714}
715
Greg Kroah-Hartman48c68c42012-12-21 13:07:39 -0800716static int pxa3xx_gcu_remove(struct platform_device *dev)
Daniel Mack364dbdf2010-11-04 14:44:00 -0400717{
718 struct pxa3xx_gcu_priv *priv = platform_get_drvdata(dev);
719 struct resource *r = priv->resource_mem;
720
721 pxa3xx_gcu_wait_idle(priv);
722
723 misc_deregister(&priv->misc_dev);
724 dma_free_coherent(&dev->dev, SHARED_SIZE,
725 priv->shared, priv->shared_phys);
726 iounmap(priv->mmio_base);
727 release_mem_region(r->start, resource_size(r));
728 platform_set_drvdata(dev, NULL);
729 clk_disable(priv->clk);
730 free_buffers(dev, priv);
731 kfree(priv);
732
733 return 0;
734}
735
736static struct platform_driver pxa3xx_gcu_driver = {
737 .probe = pxa3xx_gcu_probe,
Greg Kroah-Hartman48c68c42012-12-21 13:07:39 -0800738 .remove = pxa3xx_gcu_remove,
Daniel Mack364dbdf2010-11-04 14:44:00 -0400739 .driver = {
740 .owner = THIS_MODULE,
741 .name = DRV_NAME,
742 },
743};
744
Axel Lin4277f2c2011-11-26 10:25:54 +0800745module_platform_driver(pxa3xx_gcu_driver);
Daniel Mack364dbdf2010-11-04 14:44:00 -0400746
747MODULE_DESCRIPTION("PXA3xx graphics controller unit driver");
748MODULE_LICENSE("GPL");
749MODULE_ALIAS_MISCDEV(MISCDEV_MINOR);
750MODULE_AUTHOR("Janine Kropp <nin@directfb.org>, "
751 "Denis Oliver Kropp <dok@directfb.org>, "
752 "Daniel Mack <daniel@caiaq.de>");