summaryrefslogtreecommitdiff
path: root/target/linux/brcm2708/patches-4.1/0117-BCM270x-Switch-to-firmware-driver.patch
blob: b13113cdd80db4c0c836d263fcbbb4e18e38d74a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
From 96b48f6ba14e6e422f1c1d8a4e193ac1e9922c37 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
Date: Fri, 26 Jun 2015 14:37:19 +0200
Subject: [PATCH 117/148] BCM270x: Switch to firmware driver
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

defconfig: enable BCM2835_MBOX, RASPBERRYPI_FIRMWARE and BCM_VCIO.
Add firmware node and change mailbox node in Device Tree.
Add/update platform file for firmware and mailbox.
Strip bcm2708-vcio of everything except the legacy API and hook it
up with the firmware driver.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
 arch/arm/boot/dts/bcm2708_common.dtsi |   8 +-
 arch/arm/configs/bcm2709_defconfig    |   3 +
 arch/arm/configs/bcmrpi_defconfig     |   3 +
 arch/arm/mach-bcm2708/bcm2708.c       |  13 +-
 arch/arm/mach-bcm2709/bcm2709.c       |  13 +-
 drivers/mailbox/Kconfig               |   2 +-
 drivers/mailbox/bcm2708-vcio.c        | 353 ++--------------------------------
 7 files changed, 51 insertions(+), 344 deletions(-)

--- a/arch/arm/boot/dts/bcm2708_common.dtsi
+++ b/arch/arm/boot/dts/bcm2708_common.dtsi
@@ -74,9 +74,10 @@
 		};
 
 		mailbox: mailbox@7e00b800 {
-			compatible = "brcm,bcm2708-vcio";
+			compatible = "brcm,bcm2835-mbox";
 			reg = <0x7e00b880 0x40>;
 			interrupts = <0 1>;
+			#mbox-cells = <0>;
 		};
 
 		watchdog: watchdog@7e100000 {
@@ -205,6 +206,11 @@
 				     <1 9>;
 		};
 
+		firmware: firmware {
+			compatible = "raspberrypi,bcm2835-firmware";
+			mboxes = <&mailbox>;
+		};
+
 		leds: leds {
 			compatible = "gpio-leds";
 		};
--- a/arch/arm/configs/bcm2709_defconfig
+++ b/arch/arm/configs/bcm2709_defconfig
@@ -574,6 +574,7 @@ CONFIG_HW_RANDOM_BCM2708=m
 CONFIG_RAW_DRIVER=y
 CONFIG_BRCM_CHAR_DRIVERS=y
 CONFIG_BCM_VC_CMA=y
+CONFIG_BCM_VCIO=y
 CONFIG_BCM_VC_SM=y
 CONFIG_I2C=y
 CONFIG_I2C_CHARDEV=m
@@ -1074,6 +1075,7 @@ CONFIG_FB_FLEX=m
 CONFIG_FB_TFT_FBTFT_DEVICE=m
 CONFIG_MAILBOX=y
 CONFIG_BCM2708_MBOX=y
+CONFIG_BCM2835_MBOX=y
 # CONFIG_IOMMU_SUPPORT is not set
 CONFIG_EXTCON=m
 CONFIG_EXTCON_ARIZONA=m
@@ -1082,6 +1084,7 @@ CONFIG_IIO_BUFFER=y
 CONFIG_IIO_BUFFER_CB=y
 CONFIG_IIO_KFIFO_BUF=m
 CONFIG_DHT11=m
+CONFIG_RASPBERRYPI_FIRMWARE=y
 CONFIG_EXT4_FS=y
 CONFIG_EXT4_FS_POSIX_ACL=y
 CONFIG_EXT4_FS_SECURITY=y
--- a/arch/arm/configs/bcmrpi_defconfig
+++ b/arch/arm/configs/bcmrpi_defconfig
@@ -567,6 +567,7 @@ CONFIG_HW_RANDOM_BCM2708=m
 CONFIG_RAW_DRIVER=y
 CONFIG_BRCM_CHAR_DRIVERS=y
 CONFIG_BCM_VC_CMA=y
+CONFIG_BCM_VCIO=y
 CONFIG_BCM_VC_SM=y
 CONFIG_I2C=y
 CONFIG_I2C_CHARDEV=m
@@ -1067,6 +1068,7 @@ CONFIG_FB_FLEX=m
 CONFIG_FB_TFT_FBTFT_DEVICE=m
 CONFIG_MAILBOX=y
 CONFIG_BCM2708_MBOX=y
+CONFIG_BCM2835_MBOX=y
 # CONFIG_IOMMU_SUPPORT is not set
 CONFIG_EXTCON=m
 CONFIG_EXTCON_ARIZONA=m
@@ -1075,6 +1077,7 @@ CONFIG_IIO_BUFFER=y
 CONFIG_IIO_BUFFER_CB=y
 CONFIG_IIO_KFIFO_BUF=m
 CONFIG_DHT11=m
+CONFIG_RASPBERRYPI_FIRMWARE=y
 CONFIG_EXT4_FS=y
 CONFIG_EXT4_FS_POSIX_ACL=y
 CONFIG_EXT4_FS_SECURITY=y
--- a/arch/arm/mach-bcm2708/bcm2708.c
+++ b/arch/arm/mach-bcm2708/bcm2708.c
@@ -405,7 +405,7 @@ static struct resource bcm2708_vcio_reso
 static u64 vcio_dmamask = DMA_BIT_MASK(DMA_MASK_BITS_COMMON);
 
 static struct platform_device bcm2708_vcio_device = {
-	.name = "bcm2708_vcio",
+	.name = "bcm2835-mbox",
 	.id = -1,		/* only one VideoCore I/O area */
 	.resource = bcm2708_vcio_resources,
 	.num_resources = ARRAY_SIZE(bcm2708_vcio_resources),
@@ -415,6 +415,16 @@ static struct platform_device bcm2708_vc
 		},
 };
 
+static u64 rpifw_dmamask = DMA_BIT_MASK(DMA_MASK_BITS_COMMON);
+
+static struct platform_device bcm2708_rpifw_device = {
+	.name = "raspberrypi-firmware",
+	.dev = {
+		.dma_mask = &rpifw_dmamask,
+		.coherent_dma_mask = DMA_BIT_MASK(DMA_MASK_BITS_COMMON),
+	},
+};
+
 static struct resource bcm2708_vchiq_resources[] = {
 	{
 		.start = ARMCTRL_0_BELL_BASE,
@@ -871,6 +881,7 @@ void __init bcm2708_init(void)
 
 	bcm_register_device_dt(&bcm2708_dmaengine_device);
 	bcm_register_device_dt(&bcm2708_vcio_device);
+	bcm_register_device_dt(&bcm2708_rpifw_device);
 	bcm_register_device_dt(&bcm2708_vchiq_device);
 #ifdef CONFIG_BCM2708_GPIO
 	bcm_register_device_dt(&bcm2708_gpio_device);
--- a/arch/arm/mach-bcm2709/bcm2709.c
+++ b/arch/arm/mach-bcm2709/bcm2709.c
@@ -426,7 +426,7 @@ static struct resource bcm2708_vcio_reso
 static u64 vcio_dmamask = DMA_BIT_MASK(DMA_MASK_BITS_COMMON);
 
 static struct platform_device bcm2708_vcio_device = {
-	.name = "bcm2708_vcio",
+	.name = "bcm2835-mbox",
 	.id = -1,		/* only one VideoCore I/O area */
 	.resource = bcm2708_vcio_resources,
 	.num_resources = ARRAY_SIZE(bcm2708_vcio_resources),
@@ -436,6 +436,16 @@ static struct platform_device bcm2708_vc
 		},
 };
 
+static u64 rpifw_dmamask = DMA_BIT_MASK(DMA_MASK_BITS_COMMON);
+
+static struct platform_device bcm2708_rpifw_device = {
+	.name = "raspberrypi-firmware",
+	.dev = {
+		.dma_mask = &rpifw_dmamask,
+		.coherent_dma_mask = DMA_BIT_MASK(DMA_MASK_BITS_COMMON),
+	},
+};
+
 static struct resource bcm2708_vchiq_resources[] = {
 	{
 		.start = ARMCTRL_0_BELL_BASE,
@@ -892,6 +902,7 @@ void __init bcm2709_init(void)
 
 	bcm_register_device_dt(&bcm2708_dmaengine_device);
 	bcm_register_device_dt(&bcm2708_vcio_device);
+	bcm_register_device_dt(&bcm2708_rpifw_device);
 	bcm_register_device_dt(&bcm2708_vchiq_device);
 #ifdef CONFIG_BCM2708_GPIO
 	bcm_register_device_dt(&bcm2708_gpio_device);
--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -9,7 +9,7 @@ if MAILBOX
 
 config BCM2708_MBOX
 	bool "Broadcom BCM2708 Mailbox (vcio)"
-	depends on MACH_BCM2708 || MACH_BCM2709 || ARCH_BCM2835
+	depends on BCM2835_MBOX
 	help
 	  Broadcom BCM2708 Mailbox (vcio)
 
--- a/drivers/mailbox/bcm2708-vcio.c
+++ b/drivers/mailbox/bcm2708-vcio.c
@@ -1,6 +1,4 @@
 /*
- *  linux/arch/arm/mach-bcm2708/vcio.c
- *
  *  Copyright (C) 2010 Broadcom
  *
  * This program is free software; you can redistribute it and/or modify
@@ -12,195 +10,38 @@
  * VideoCore processor
  */
 
-#include <linux/device.h>
 #include <linux/dma-mapping.h>
-#include <linux/module.h>
-#include <linux/errno.h>
-#include <linux/fs.h>
 #include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/ioctl.h>
+#include <linux/module.h>
 #include <linux/platform_data/mailbox-bcm2708.h>
-#include <linux/platform_device.h>
 #include <linux/uaccess.h>
+#include <soc/bcm2835/raspberrypi-firmware.h>
 
 #define DRIVER_NAME "bcm2708_vcio"
-#define DEVICE_FILE_NAME "vcio"
-
-/* offsets from a mail box base address */
-#define MAIL0_RD	0x00	/* read - and next 4 words */
-#define MAIL0_POL	0x10	/* read without popping the fifo */
-#define MAIL0_SND	0x14	/* sender ID (bottom two bits) */
-#define MAIL0_STA	0x18	/* status */
-#define MAIL0_CNF	0x1C	/* configuration */
-#define MAIL1_WRT	0x20	/* write - and next 4 words */
-#define MAIL1_STA	0x38	/* status */
-
-/* On MACH_BCM270x these come through <linux/interrupt.h> (arm_control.h ) */
-#ifndef ARM_MS_EMPTY
-#define ARM_MS_EMPTY   BIT(30)
-#define ARM_MS_FULL    BIT(31)
-
-#define ARM_MC_IHAVEDATAIRQEN  BIT(0)
-#endif
-
-#define MBOX_MSG(chan, data28)		(((data28) & ~0xf) | ((chan) & 0xf))
-#define MBOX_MSG_LSB(chan, data28)	(((data28) << 4) | ((chan) & 0xf))
-#define MBOX_CHAN(msg)			((msg) & 0xf)
-#define MBOX_DATA28(msg)		((msg) & ~0xf)
-#define MBOX_DATA28_LSB(msg)		(((uint32_t)msg) >> 4)
-
-#define MBOX_MAGIC 0xd0d0c0de
-
-#define MAJOR_NUM 100
-#define IOCTL_MBOX_PROPERTY _IOWR(MAJOR_NUM, 0, char *)
-
-static struct class *vcio_class;
-
-struct vc_mailbox {
-	void __iomem *regs;
-	uint32_t msg[MBOX_CHAN_COUNT];
-	struct semaphore sema[MBOX_CHAN_COUNT];
-	uint32_t magic;
-};
-
-static void mbox_init(struct vc_mailbox *mbox_out)
-{
-	int i;
-
-	for (i = 0; i < MBOX_CHAN_COUNT; i++) {
-		mbox_out->msg[i] = 0;
-		sema_init(&mbox_out->sema[i], 0);
-	}
-
-	/* Enable the interrupt on data reception */
-	writel(ARM_MC_IHAVEDATAIRQEN, mbox_out->regs + MAIL0_CNF);
-
-	mbox_out->magic = MBOX_MAGIC;
-}
-
-static int mbox_write(struct vc_mailbox *mbox, unsigned chan, uint32_t data28)
-{
-	if (mbox->magic != MBOX_MAGIC)
-		return -EINVAL;
-
-	/* wait for the mailbox FIFO to have some space in it */
-	while (0 != (readl(mbox->regs + MAIL1_STA) & ARM_MS_FULL))
-		cpu_relax();
-
-	writel(MBOX_MSG(chan, data28), mbox->regs + MAIL1_WRT);
-
-	return 0;
-}
-
-static int mbox_read(struct vc_mailbox *mbox, unsigned chan, uint32_t *data28)
-{
-	if (mbox->magic != MBOX_MAGIC)
-		return -EINVAL;
-
-	down(&mbox->sema[chan]);
-	*data28 = MBOX_DATA28(mbox->msg[chan]);
-	mbox->msg[chan] = 0;
-
-	return 0;
-}
-
-static irqreturn_t mbox_irq_handler(int irq, void *dev_id)
-{
-	/* wait for the mailbox FIFO to have some data in it */
-	struct vc_mailbox *mbox = (struct vc_mailbox *)dev_id;
-	int status = readl(mbox->regs + MAIL0_STA);
-	int ret = IRQ_NONE;
-
-	while (!(status & ARM_MS_EMPTY)) {
-		uint32_t msg = readl(mbox->regs + MAIL0_RD);
-		int chan = MBOX_CHAN(msg);
-
-		if (chan < MBOX_CHAN_COUNT) {
-			if (mbox->msg[chan]) {
-				pr_err(DRIVER_NAME
-				       ": mbox chan %d overflow - drop %08x\n",
-				       chan, msg);
-			} else {
-				mbox->msg[chan] = (msg | 0xf);
-				up(&mbox->sema[chan]);
-			}
-		} else {
-			pr_err(DRIVER_NAME
-			       ": invalid channel selector (msg %08x)\n", msg);
-		}
-		ret = IRQ_HANDLED;
-		status = readl(mbox->regs + MAIL0_STA);
-	}
-	return ret;
-}
-
-/* Mailbox Methods */
-
-static struct device *mbox_dev;	/* we assume there's only one! */
-
-static int dev_mbox_write(struct device *dev, unsigned chan, uint32_t data28)
-{
-	struct vc_mailbox *mailbox = dev_get_drvdata(dev);
-	int rc;
-
-	device_lock(dev);
-	rc = mbox_write(mailbox, chan, data28);
-	device_unlock(dev);
-
-	return rc;
-}
-
-static int dev_mbox_read(struct device *dev, unsigned chan, uint32_t *data28)
-{
-	struct vc_mailbox *mailbox = dev_get_drvdata(dev);
-	int rc;
-
-	device_lock(dev);
-	rc = mbox_read(mailbox, chan, data28);
-	device_unlock(dev);
-
-	return rc;
-}
 
 extern int bcm_mailbox_write(unsigned chan, uint32_t data28)
 {
-	if (!mbox_dev)
+	struct rpi_firmware *fw = rpi_firmware_get(NULL);
+
+	if (!fw)
 		return -ENODEV;
 
-	return dev_mbox_write(mbox_dev, chan, data28);
+	return rpi_firmware_transaction(fw, chan, data28);
 }
 EXPORT_SYMBOL_GPL(bcm_mailbox_write);
 
 extern int bcm_mailbox_read(unsigned chan, uint32_t *data28)
 {
-	if (!mbox_dev)
-		return -ENODEV;
-
-	return dev_mbox_read(mbox_dev, chan, data28);
-}
-EXPORT_SYMBOL_GPL(bcm_mailbox_read);
-
-static int mbox_copy_from_user(void *dst, const void *src, int size)
-{
-	if ((uint32_t)src < TASK_SIZE)
-		return copy_from_user(dst, src, size);
-
-	memcpy(dst, src, size);
+	struct rpi_firmware *fw = rpi_firmware_get(NULL);
 
-	return 0;
-}
-
-static int mbox_copy_to_user(void *dst, const void *src, int size)
-{
-	if ((uint32_t)dst < TASK_SIZE)
-		return copy_to_user(dst, src, size);
+	if (!fw)
+		return -ENODEV;
 
-	memcpy(dst, src, size);
+	*data28 = rpi_firmware_transaction_received(fw);
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(bcm_mailbox_read);
 
 static DEFINE_MUTEX(mailbox_lock);
 extern int bcm_mailbox_property(void *data, int size)
@@ -216,7 +57,7 @@ extern int bcm_mailbox_property(void *da
 				      GFP_KERNEL);
 	if (mem_kern) {
 		/* create the message */
-		mbox_copy_from_user(mem_kern, data, size);
+		memcpy(mem_kern, data, size);
 
 		/* send the message */
 		wmb();
@@ -226,7 +67,7 @@ extern int bcm_mailbox_property(void *da
 		if (s == 0) {
 			/* copy the response */
 			rmb();
-			mbox_copy_to_user(data, mem_kern, size);
+			memcpy(data, mem_kern, size);
 		}
 		dma_free_coherent(NULL, PAGE_ALIGN(size), mem_kern, mem_bus);
 	} else {
@@ -240,174 +81,6 @@ extern int bcm_mailbox_property(void *da
 }
 EXPORT_SYMBOL_GPL(bcm_mailbox_property);
 
-/* Platform Device for Mailbox */
-
-/* This is called whenever a process attempts to open the device file */
-static int device_open(struct inode *inode, struct file *file)
-{
-	try_module_get(THIS_MODULE);
-
-	return 0;
-}
-
-static int device_release(struct inode *inode, struct file *file)
-{
-	module_put(THIS_MODULE);
-
-	return 0;
-}
-
-/*
- * This function is called whenever a process tries to do an ioctl on our
- * device file. We get two extra parameters (additional to the inode and file
- * structures, which all device functions get): the number of the ioctl called
- * and the parameter given to the ioctl function.
- *
- * If the ioctl is write or read/write (meaning output is returned to the
- * calling process), the ioctl call returns the output of this function.
- *
- */
-static long device_ioctl(struct file *file, unsigned int ioctl_num,
-			 unsigned long ioctl_param)
-{
-	unsigned size;
-
-	switch (ioctl_num) {
-	case IOCTL_MBOX_PROPERTY:
-		/*
-		 * Receive a pointer to a message (in user space) and set that
-		 * to be the device's message.  Get the parameter given to
-		 * ioctl by the process.
-		 */
-		mbox_copy_from_user(&size, (void *)ioctl_param, sizeof(size));
-		return bcm_mailbox_property((void *)ioctl_param, size);
-	default:
-		pr_err(DRIVER_NAME "unknown ioctl: %d\n", ioctl_num);
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-/* Module Declarations */
-
-/*
- * This structure will hold the functions to be called
- * when a process does something to the device we
- * created. Since a pointer to this structure is kept in
- * the devices table, it can't be local to
- * init_module. NULL is for unimplemented functios.
- */
-const struct file_operations fops = {
-	.unlocked_ioctl = device_ioctl,
-	.open = device_open,
-	.release = device_release,	/* a.k.a. close */
-};
-
-static int bcm_vcio_probe(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	struct device *vdev;
-	struct vc_mailbox *mailbox;
-	struct resource *res;
-	int irq, ret;
-
-	mailbox = devm_kzalloc(dev, sizeof(*mailbox), GFP_KERNEL);
-	if (!mailbox)
-		return -ENOMEM;
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	mailbox->regs = devm_ioremap_resource(dev, res);
-	if (IS_ERR(mailbox->regs))
-		return PTR_ERR(mailbox->regs);
-
-	irq = platform_get_irq(pdev, 0);
-	ret = devm_request_irq(dev, irq, mbox_irq_handler,
-			       IRQF_IRQPOLL,
-			       dev_name(dev), mailbox);
-	if (ret) {
-		dev_err(dev, "Interrupt request failed %d\n", ret);
-		return ret;
-	}
-
-	ret = register_chrdev(MAJOR_NUM, DEVICE_FILE_NAME, &fops);
-	if (ret < 0) {
-		pr_err("Character device registration failed %d\n", ret);
-		return ret;
-	}
-
-	vcio_class = class_create(THIS_MODULE, DRIVER_NAME);
-	if (IS_ERR(vcio_class)) {
-		ret = PTR_ERR(vcio_class);
-		pr_err("Class creation failed %d\n", ret);
-		goto err_class;
-	}
-
-	vdev = device_create(vcio_class, NULL, MKDEV(MAJOR_NUM, 0), NULL,
-			     "vcio");
-	if (IS_ERR(vdev)) {
-		ret = PTR_ERR(vdev);
-		pr_err("Device creation failed %d\n", ret);
-		goto err_dev;
-	}
-
-	mbox_init(mailbox);
-	platform_set_drvdata(pdev, mailbox);
-	mbox_dev = dev;
-
-	dev_info(dev, "mailbox at %p\n", mailbox->regs);
-
-	return 0;
-
-err_dev:
-	class_destroy(vcio_class);
-err_class:
-	unregister_chrdev(MAJOR_NUM, DEVICE_FILE_NAME);
-
-	return ret;
-}
-
-static int bcm_vcio_remove(struct platform_device *pdev)
-{
-	mbox_dev = NULL;
-	platform_set_drvdata(pdev, NULL);
-	device_destroy(vcio_class, MKDEV(MAJOR_NUM, 0));
-	class_destroy(vcio_class);
-	unregister_chrdev(MAJOR_NUM, DEVICE_FILE_NAME);
-
-	return 0;
-}
-
-static const struct of_device_id bcm_vcio_of_match_table[] = {
-	{ .compatible = "brcm,bcm2708-vcio", },
-	{},
-};
-MODULE_DEVICE_TABLE(of, bcm_vcio_of_match_table);
-
-static struct platform_driver bcm_mbox_driver = {
-	.probe = bcm_vcio_probe,
-	.remove = bcm_vcio_remove,
-
-	.driver = {
-		   .name = DRIVER_NAME,
-		   .owner = THIS_MODULE,
-		   .of_match_table = bcm_vcio_of_match_table,
-		   },
-};
-
-static int __init bcm_mbox_init(void)
-{
-	return platform_driver_register(&bcm_mbox_driver);
-}
-
-static void __exit bcm_mbox_exit(void)
-{
-	platform_driver_unregister(&bcm_mbox_driver);
-}
-
-arch_initcall(bcm_mbox_init);	/* Initialize early */
-module_exit(bcm_mbox_exit);
-
 MODULE_AUTHOR("Gray Girling");
 MODULE_DESCRIPTION("ARM I/O to VideoCore processor");
 MODULE_LICENSE("GPL");