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i2c: imx: check busy bit when START/STOP
[mirror_ubuntu-artful-kernel.git] / drivers / i2c / busses / i2c-imx.c
CommitLineData
aa11e38c
DA		 1/*
2 * Copyright (C) 2002 Motorola GSG-China
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
17 * USA.
18 *
19 * Author:
20 * Darius Augulis, Teltonika Inc.
21 *
22 * Desc.:
23 * Implementation of I2C Adapter/Algorithm Driver
24 * for I2C Bus integrated in Freescale i.MX/MXC processors
25 *
26 * Derived from Motorola GSG China I2C example driver
27 *
28 * Copyright (C) 2005 Torsten Koschorrek <koschorrek at synertronixx.de
29 * Copyright (C) 2005 Matthias Blaschke <blaschke at synertronixx.de
30 * Copyright (C) 2007 RightHand Technologies, Inc.
31 * Copyright (C) 2008 Darius Augulis <darius.augulis at teltonika.lt>
32 *
33 */
34
35/** Includes *******************************************************************
36*******************************************************************************/
37
38#include <linux/init.h>
39#include <linux/kernel.h>
40#include <linux/module.h>
41#include <linux/errno.h>
42#include <linux/err.h>
43#include <linux/interrupt.h>
44#include <linux/delay.h>
45#include <linux/i2c.h>
46#include <linux/io.h>
47#include <linux/sched.h>
48#include <linux/platform_device.h>
49#include <linux/clk.h>
50
51#include <mach/irqs.h>
52#include <mach/hardware.h>
53#include <mach/i2c.h>
54
55/** Defines ********************************************************************
56*******************************************************************************/
57
58/* This will be the driver name the kernel reports */
59#define DRIVER_NAME "imx-i2c"
60
61/* Default value */
62#define IMX_I2C_BIT_RATE 100000 /* 100kHz */
63
64/* IMX I2C registers */
65#define IMX_I2C_IADR 0x00 /* i2c slave address */
66#define IMX_I2C_IFDR 0x04 /* i2c frequency divider */
67#define IMX_I2C_I2CR 0x08 /* i2c control */
68#define IMX_I2C_I2SR 0x0C /* i2c status */
69#define IMX_I2C_I2DR 0x10 /* i2c transfer data */
70
71/* Bits of IMX I2C registers */
72#define I2SR_RXAK 0x01
73#define I2SR_IIF 0x02
74#define I2SR_SRW 0x04
75#define I2SR_IAL 0x10
76#define I2SR_IBB 0x20
77#define I2SR_IAAS 0x40
78#define I2SR_ICF 0x80
79#define I2CR_RSTA 0x04
80#define I2CR_TXAK 0x08
81#define I2CR_MTX 0x10
82#define I2CR_MSTA 0x20
83#define I2CR_IIEN 0x40
84#define I2CR_IEN 0x80
85
86/** Variables ******************************************************************
87*******************************************************************************/
88
aa11e38c
DA		 89/*
90 * sorted list of clock divider, register value pairs
91 * taken from table 26-5, p.26-9, Freescale i.MX
92 * Integrated Portable System Processor Reference Manual
93 * Document Number: MC9328MXLRM, Rev. 5.1, 06/2007
94 *
95 * Duplicated divider values removed from list
96 */
97
98static u16 __initdata i2c_clk_div[50][2] = {
99 { 22, 0x20 }, { 24, 0x21 }, { 26, 0x22 }, { 28, 0x23 },
100 { 30, 0x00 }, { 32, 0x24 }, { 36, 0x25 }, { 40, 0x26 },
101 { 42, 0x03 }, { 44, 0x27 }, { 48, 0x28 }, { 52, 0x05 },
102 { 56, 0x29 }, { 60, 0x06 }, { 64, 0x2A }, { 72, 0x2B },
103 { 80, 0x2C }, { 88, 0x09 }, { 96, 0x2D }, { 104, 0x0A },
104 { 112, 0x2E }, { 128, 0x2F }, { 144, 0x0C }, { 160, 0x30 },
105 { 192, 0x31 }, { 224, 0x32 }, { 240, 0x0F }, { 256, 0x33 },
106 { 288, 0x10 }, { 320, 0x34 }, { 384, 0x35 }, { 448, 0x36 },
107 { 480, 0x13 }, { 512, 0x37 }, { 576, 0x14 }, { 640, 0x38 },
108 { 768, 0x39 }, { 896, 0x3A }, { 960, 0x17 }, { 1024, 0x3B },
109 { 1152, 0x18 }, { 1280, 0x3C }, { 1536, 0x3D }, { 1792, 0x3E },
110 { 1920, 0x1B }, { 2048, 0x3F }, { 2304, 0x1C }, { 2560, 0x1D },
111 { 3072, 0x1E }, { 3840, 0x1F }
112};
113
114struct imx_i2c_struct {
115 struct i2c_adapter adapter;
116 struct resource *res;
117 struct clk *clk;
118 void __iomem *base;
119 int irq;
120 wait_queue_head_t queue;
121 unsigned long i2csr;
65de394d 122 unsigned int disable_delay;
43309f3b 123 int stopped;
aa11e38c
DA		 124};
125
126/** Functions for IMX I2C adapter driver ***************************************
127*******************************************************************************/
128
43309f3b 129static int i2c_imx_bus_busy(struct imx_i2c_struct *i2c_imx, int for_busy)
aa11e38c
DA		 130{
131 unsigned long orig_jiffies = jiffies;
43309f3b 132 unsigned int temp;
aa11e38c
DA		 133
134 dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
135
43309f3b
RZ		 136 while (1) {
137 temp = readb(i2c_imx->base + IMX_I2C_I2SR);
138 if (for_busy && (temp & I2SR_IBB))
139 break;
140 if (!for_busy && !(temp & I2SR_IBB))
141 break;
aa11e38c
DA		 142 if (signal_pending(current)) {
143 dev_dbg(&i2c_imx->adapter.dev,
144 "<%s> I2C Interrupted\n", __func__);
145 return -EINTR;
146 }
147 if (time_after(jiffies, orig_jiffies + HZ / 1000)) {
148 dev_dbg(&i2c_imx->adapter.dev,
149 "<%s> I2C bus is busy\n", __func__);
150 return -EIO;
151 }
152 schedule();
153 }
154
155 return 0;
156}
157
158static int i2c_imx_trx_complete(struct imx_i2c_struct *i2c_imx)
159{
160 int result;
161
162 result = wait_event_interruptible_timeout(i2c_imx->queue,
163 i2c_imx->i2csr & I2SR_IIF, HZ / 10);
164
165 if (unlikely(result < 0)) {
166 dev_dbg(&i2c_imx->adapter.dev, "<%s> result < 0\n", __func__);
167 return result;
168 } else if (unlikely(!(i2c_imx->i2csr & I2SR_IIF))) {
169 dev_dbg(&i2c_imx->adapter.dev, "<%s> Timeout\n", __func__);
170 return -ETIMEDOUT;
171 }
172 dev_dbg(&i2c_imx->adapter.dev, "<%s> TRX complete\n", __func__);
173 i2c_imx->i2csr = 0;
174 return 0;
175}
176
177static int i2c_imx_acked(struct imx_i2c_struct *i2c_imx)
178{
179 if (readb(i2c_imx->base + IMX_I2C_I2SR) & I2SR_RXAK) {
180 dev_dbg(&i2c_imx->adapter.dev, "<%s> No ACK\n", __func__);
181 return -EIO; /* No ACK */
182 }
183
184 dev_dbg(&i2c_imx->adapter.dev, "<%s> ACK received\n", __func__);
185 return 0;
186}
187
43309f3b 188static int i2c_imx_start(struct imx_i2c_struct *i2c_imx)
aa11e38c
DA		 189{
190 unsigned int temp = 0;
43309f3b 191 int result;
aa11e38c
DA		 192
193 dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
194
195 /* Enable I2C controller */
43309f3b 196 writeb(0, i2c_imx->base + IMX_I2C_I2SR);
aa11e38c 197 writeb(I2CR_IEN, i2c_imx->base + IMX_I2C_I2CR);
43309f3b
RZ		 198
199 /* Wait controller to be stable */
200 udelay(50);
201
aa11e38c
DA		 202 /* Start I2C transaction */
203 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
204 temp |= I2CR_MSTA;
205 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
43309f3b
RZ		 206 result = i2c_imx_bus_busy(i2c_imx, 1);
207 if (result)
208 return result;
209 i2c_imx->stopped = 0;
210
aa11e38c
DA		 211 temp |= I2CR_IIEN | I2CR_MTX | I2CR_TXAK;
212 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
43309f3b 213 return result;
aa11e38c
DA		 214}
215
216static void i2c_imx_stop(struct imx_i2c_struct *i2c_imx)
217{
218 unsigned int temp = 0;
219
43309f3b
RZ		 220 if (!i2c_imx->stopped) {
221 /* Stop I2C transaction */
222 dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
223 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
224 temp &= ~(I2CR_MSTA | I2CR_MTX);
225 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
226 i2c_imx->stopped = 1;
227 }
aa11e38c
DA		 228 /*
229 * This delay caused by an i.MXL hardware bug.
230 * If no (or too short) delay, no "STOP" bit will be generated.
231 */
65de394d 232 udelay(i2c_imx->disable_delay);
43309f3b
RZ		 233
234 if (!i2c_imx->stopped)
235 i2c_imx_bus_busy(i2c_imx, 0);
236
aa11e38c
DA		 237 /* Disable I2C controller */
238 writeb(0, i2c_imx->base + IMX_I2C_I2CR);
239}
240
241static void __init i2c_imx_set_clk(struct imx_i2c_struct *i2c_imx,
242 unsigned int rate)
243{
244 unsigned int i2c_clk_rate;
245 unsigned int div;
246 int i;
247
248 /* Divider value calculation */
249 i2c_clk_rate = clk_get_rate(i2c_imx->clk);
250 div = (i2c_clk_rate + rate - 1) / rate;
251 if (div < i2c_clk_div[0][0])
252 i = 0;
253 else if (div > i2c_clk_div[ARRAY_SIZE(i2c_clk_div) - 1][0])
254 i = ARRAY_SIZE(i2c_clk_div) - 1;
255 else
256 for (i = 0; i2c_clk_div[i][0] < div; i++);
257
258 /* Write divider value to register */
259 writeb(i2c_clk_div[i][1], i2c_imx->base + IMX_I2C_IFDR);
260
261 /*
262 * There dummy delay is calculated.
263 * It should be about one I2C clock period long.
264 * This delay is used in I2C bus disable function
265 * to fix chip hardware bug.
266 */
65de394d 267 i2c_imx->disable_delay = (500000U * i2c_clk_div[i][0]
aa11e38c
DA		 268 + (i2c_clk_rate / 2) - 1) / (i2c_clk_rate / 2);
269
270 /* dev_dbg() can't be used, because adapter is not yet registered */
271#ifdef CONFIG_I2C_DEBUG_BUS
272 printk(KERN_DEBUG "I2C: <%s> I2C_CLK=%d, REQ DIV=%d\n",
273 __func__, i2c_clk_rate, div);
274 printk(KERN_DEBUG "I2C: <%s> IFDR[IC]=0x%x, REAL DIV=%d\n",
275 __func__, i2c_clk_div[i][1], i2c_clk_div[i][0]);
276#endif
277}
278
279static irqreturn_t i2c_imx_isr(int irq, void *dev_id)
280{
281 struct imx_i2c_struct *i2c_imx = dev_id;
282 unsigned int temp;
283
284 temp = readb(i2c_imx->base + IMX_I2C_I2SR);
285 if (temp & I2SR_IIF) {
286 /* save status register */
287 i2c_imx->i2csr = temp;
288 temp &= ~I2SR_IIF;
289 writeb(temp, i2c_imx->base + IMX_I2C_I2SR);
290 wake_up_interruptible(&i2c_imx->queue);
291 return IRQ_HANDLED;
292 }
293
294 return IRQ_NONE;
295}
296
297static int i2c_imx_write(struct imx_i2c_struct *i2c_imx, struct i2c_msg *msgs)
298{
299 int i, result;
300
301 dev_dbg(&i2c_imx->adapter.dev, "<%s> write slave address: addr=0x%x\n",
302 __func__, msgs->addr << 1);
303
304 /* write slave address */
305 writeb(msgs->addr << 1, i2c_imx->base + IMX_I2C_I2DR);
306 result = i2c_imx_trx_complete(i2c_imx);
307 if (result)
308 return result;
309 result = i2c_imx_acked(i2c_imx);
310 if (result)
311 return result;
312 dev_dbg(&i2c_imx->adapter.dev, "<%s> write data\n", __func__);
313
314 /* write data */
315 for (i = 0; i < msgs->len; i++) {
316 dev_dbg(&i2c_imx->adapter.dev,
317 "<%s> write byte: B%d=0x%X\n",
318 __func__, i, msgs->buf[i]);
319 writeb(msgs->buf[i], i2c_imx->base + IMX_I2C_I2DR);
320 result = i2c_imx_trx_complete(i2c_imx);
321 if (result)
322 return result;
323 result = i2c_imx_acked(i2c_imx);
324 if (result)
325 return result;
326 }
327 return 0;
328}
329
330static int i2c_imx_read(struct imx_i2c_struct *i2c_imx, struct i2c_msg *msgs)
331{
332 int i, result;
333 unsigned int temp;
334
335 dev_dbg(&i2c_imx->adapter.dev,
336 "<%s> write slave address: addr=0x%x\n",
337 __func__, (msgs->addr << 1) | 0x01);
338
339 /* write slave address */
340 writeb((msgs->addr << 1) | 0x01, i2c_imx->base + IMX_I2C_I2DR);
341 result = i2c_imx_trx_complete(i2c_imx);
342 if (result)
343 return result;
344 result = i2c_imx_acked(i2c_imx);
345 if (result)
346 return result;
347
348 dev_dbg(&i2c_imx->adapter.dev, "<%s> setup bus\n", __func__);
349
350 /* setup bus to read data */
351 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
352 temp &= ~I2CR_MTX;
353 if (msgs->len - 1)
354 temp &= ~I2CR_TXAK;
355 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
356 readb(i2c_imx->base + IMX_I2C_I2DR); /* dummy read */
357
358 dev_dbg(&i2c_imx->adapter.dev, "<%s> read data\n", __func__);
359
360 /* read data */
361 for (i = 0; i < msgs->len; i++) {
362 result = i2c_imx_trx_complete(i2c_imx);
363 if (result)
364 return result;
365 if (i == (msgs->len - 1)) {
43309f3b
RZ		 366 /* It must generate STOP before read I2DR to prevent
367 controller from generating another clock cycle */
aa11e38c
DA		 368 dev_dbg(&i2c_imx->adapter.dev,
369 "<%s> clear MSTA\n", __func__);
370 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
43309f3b 371 temp &= ~(I2CR_MSTA | I2CR_MTX);
aa11e38c 372 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
43309f3b
RZ		 373 i2c_imx_bus_busy(i2c_imx, 0);
374 i2c_imx->stopped = 1;
aa11e38c
DA		 375 } else if (i == (msgs->len - 2)) {
376 dev_dbg(&i2c_imx->adapter.dev,
377 "<%s> set TXAK\n", __func__);
378 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
379 temp |= I2CR_TXAK;
380 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
381 }
382 msgs->buf[i] = readb(i2c_imx->base + IMX_I2C_I2DR);
383 dev_dbg(&i2c_imx->adapter.dev,
384 "<%s> read byte: B%d=0x%X\n",
385 __func__, i, msgs->buf[i]);
386 }
387 return 0;
388}
389
390static int i2c_imx_xfer(struct i2c_adapter *adapter,
391 struct i2c_msg *msgs, int num)
392{
393 unsigned int i, temp;
394 int result;
395 struct imx_i2c_struct *i2c_imx = i2c_get_adapdata(adapter);
396
397 dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
398
43309f3b
RZ		 399 /* Start I2C transfer */
400 result = i2c_imx_start(i2c_imx);
aa11e38c
DA		 401 if (result)
402 goto fail0;
403
aa11e38c
DA		 404 /* read/write data */
405 for (i = 0; i < num; i++) {
406 if (i) {
407 dev_dbg(&i2c_imx->adapter.dev,
408 "<%s> repeated start\n", __func__);
409 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
410 temp |= I2CR_RSTA;
411 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
43309f3b
RZ		 412 result = i2c_imx_bus_busy(i2c_imx, 1);
413 if (result)
414 goto fail0;
aa11e38c
DA		 415 }
416 dev_dbg(&i2c_imx->adapter.dev,
417 "<%s> transfer message: %d\n", __func__, i);
418 /* write/read data */
419#ifdef CONFIG_I2C_DEBUG_BUS
420 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
421 dev_dbg(&i2c_imx->adapter.dev, "<%s> CONTROL: IEN=%d, IIEN=%d, "
422 "MSTA=%d, MTX=%d, TXAK=%d, RSTA=%d\n", __func__,
423 (temp & I2CR_IEN ? 1 : 0), (temp & I2CR_IIEN ? 1 : 0),
424 (temp & I2CR_MSTA ? 1 : 0), (temp & I2CR_MTX ? 1 : 0),
425 (temp & I2CR_TXAK ? 1 : 0), (temp & I2CR_RSTA ? 1 : 0));
426 temp = readb(i2c_imx->base + IMX_I2C_I2SR);
427 dev_dbg(&i2c_imx->adapter.dev,
428 "<%s> STATUS: ICF=%d, IAAS=%d, IBB=%d, "
429 "IAL=%d, SRW=%d, IIF=%d, RXAK=%d\n", __func__,
430 (temp & I2SR_ICF ? 1 : 0), (temp & I2SR_IAAS ? 1 : 0),
431 (temp & I2SR_IBB ? 1 : 0), (temp & I2SR_IAL ? 1 : 0),
432 (temp & I2SR_SRW ? 1 : 0), (temp & I2SR_IIF ? 1 : 0),
433 (temp & I2SR_RXAK ? 1 : 0));
434#endif
435 if (msgs[i].flags & I2C_M_RD)
436 result = i2c_imx_read(i2c_imx, &msgs[i]);
437 else
438 result = i2c_imx_write(i2c_imx, &msgs[i]);
439 }
440
441fail0:
442 /* Stop I2C transfer */
443 i2c_imx_stop(i2c_imx);
444
445 dev_dbg(&i2c_imx->adapter.dev, "<%s> exit with: %s: %d\n", __func__,
446 (result < 0) ? "error" : "success msg",
447 (result < 0) ? result : num);
448 return (result < 0) ? result : num;
449}
450
451static u32 i2c_imx_func(struct i2c_adapter *adapter)
452{
453 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
454}
455
456static struct i2c_algorithm i2c_imx_algo = {
457 .master_xfer = i2c_imx_xfer,
458 .functionality = i2c_imx_func,
459};
460
461static int __init i2c_imx_probe(struct platform_device *pdev)
462{
463 struct imx_i2c_struct *i2c_imx;
464 struct resource *res;
465 struct imxi2c_platform_data *pdata;
466 void __iomem *base;
467 resource_size_t res_size;
468 int irq;
469 int ret;
470
471 dev_dbg(&pdev->dev, "<%s>\n", __func__);
472
473 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
474 if (!res) {
475 dev_err(&pdev->dev, "can't get device resources\n");
476 return -ENOENT;
477 }
478 irq = platform_get_irq(pdev, 0);
479 if (irq < 0) {
480 dev_err(&pdev->dev, "can't get irq number\n");
481 return -ENOENT;
482 }
483
484 pdata = pdev->dev.platform_data;
485
486 if (pdata && pdata->init) {
487 ret = pdata->init(&pdev->dev);
488 if (ret)
489 return ret;
490 }
491
492 res_size = resource_size(res);
493 base = ioremap(res->start, res_size);
494 if (!base) {
495 dev_err(&pdev->dev, "ioremap failed\n");
496 ret = -EIO;
497 goto fail0;
498 }
499
500 i2c_imx = kzalloc(sizeof(struct imx_i2c_struct), GFP_KERNEL);
501 if (!i2c_imx) {
502 dev_err(&pdev->dev, "can't allocate interface\n");
503 ret = -ENOMEM;
504 goto fail1;
505 }
506
309c18d2
DA		 507 if (!request_mem_region(res->start, res_size, DRIVER_NAME)) {
508 ret = -EBUSY;
509 goto fail2;
510 }
511
aa11e38c
DA		 512 /* Setup i2c_imx driver structure */
513 strcpy(i2c_imx->adapter.name, pdev->name);
514 i2c_imx->adapter.owner = THIS_MODULE;
515 i2c_imx->adapter.algo = &i2c_imx_algo;
516 i2c_imx->adapter.dev.parent = &pdev->dev;
517 i2c_imx->adapter.nr = pdev->id;
518 i2c_imx->irq = irq;
519 i2c_imx->base = base;
520 i2c_imx->res = res;
521
522 /* Get I2C clock */
523 i2c_imx->clk = clk_get(&pdev->dev, "i2c_clk");
524 if (IS_ERR(i2c_imx->clk)) {
525 ret = PTR_ERR(i2c_imx->clk);
526 dev_err(&pdev->dev, "can't get I2C clock\n");
309c18d2 527 goto fail3;
aa11e38c
DA		 528 }
529 clk_enable(i2c_imx->clk);
530
531 /* Request IRQ */
532 ret = request_irq(i2c_imx->irq, i2c_imx_isr, 0, pdev->name, i2c_imx);
533 if (ret) {
534 dev_err(&pdev->dev, "can't claim irq %d\n", i2c_imx->irq);
309c18d2 535 goto fail4;
aa11e38c
DA		 536 }
537
538 /* Init queue */
539 init_waitqueue_head(&i2c_imx->queue);
540
541 /* Set up adapter data */
542 i2c_set_adapdata(&i2c_imx->adapter, i2c_imx);
543
544 /* Set up clock divider */
545 if (pdata && pdata->bitrate)
546 i2c_imx_set_clk(i2c_imx, pdata->bitrate);
547 else
548 i2c_imx_set_clk(i2c_imx, IMX_I2C_BIT_RATE);
549
550 /* Set up chip registers to defaults */
551 writeb(0, i2c_imx->base + IMX_I2C_I2CR);
552 writeb(0, i2c_imx->base + IMX_I2C_I2SR);
553
554 /* Add I2C adapter */
555 ret = i2c_add_numbered_adapter(&i2c_imx->adapter);
556 if (ret < 0) {
557 dev_err(&pdev->dev, "registration failed\n");
309c18d2 558 goto fail5;
aa11e38c
DA		 559 }
560
561 /* Set up platform driver data */
562 platform_set_drvdata(pdev, i2c_imx);
563
564 dev_dbg(&i2c_imx->adapter.dev, "claimed irq %d\n", i2c_imx->irq);
565 dev_dbg(&i2c_imx->adapter.dev, "device resources from 0x%x to 0x%x\n",
566 i2c_imx->res->start, i2c_imx->res->end);
567 dev_dbg(&i2c_imx->adapter.dev, "allocated %d bytes at 0x%x \n",
568 res_size, i2c_imx->res->start);
569 dev_dbg(&i2c_imx->adapter.dev, "adapter name: \"%s\"\n",
570 i2c_imx->adapter.name);
571 dev_dbg(&i2c_imx->adapter.dev, "IMX I2C adapter registered\n");
572
573 return 0; /* Return OK */
574
309c18d2 575fail5:
aa11e38c 576 free_irq(i2c_imx->irq, i2c_imx);
309c18d2 577fail4:
aa11e38c
DA		 578 clk_disable(i2c_imx->clk);
579 clk_put(i2c_imx->clk);
309c18d2
DA		 580fail3:
581 release_mem_region(i2c_imx->res->start, resource_size(res));
aa11e38c
DA		 582fail2:
583 kfree(i2c_imx);
584fail1:
585 iounmap(base);
586fail0:
587 if (pdata && pdata->exit)
588 pdata->exit(&pdev->dev);
589 return ret; /* Return error number */
590}
591
592static int __exit i2c_imx_remove(struct platform_device *pdev)
593{
594 struct imx_i2c_struct *i2c_imx = platform_get_drvdata(pdev);
595 struct imxi2c_platform_data *pdata = pdev->dev.platform_data;
596
597 /* remove adapter */
598 dev_dbg(&i2c_imx->adapter.dev, "adapter removed\n");
599 i2c_del_adapter(&i2c_imx->adapter);
600 platform_set_drvdata(pdev, NULL);
601
602 /* free interrupt */
603 free_irq(i2c_imx->irq, i2c_imx);
604
605 /* setup chip registers to defaults */
606 writeb(0, i2c_imx->base + IMX_I2C_IADR);
607 writeb(0, i2c_imx->base + IMX_I2C_IFDR);
608 writeb(0, i2c_imx->base + IMX_I2C_I2CR);
609 writeb(0, i2c_imx->base + IMX_I2C_I2SR);
610
611 /* Shut down hardware */
612 if (pdata && pdata->exit)
613 pdata->exit(&pdev->dev);
614
615 /* Disable I2C clock */
616 clk_disable(i2c_imx->clk);
617 clk_put(i2c_imx->clk);
618
309c18d2 619 release_mem_region(i2c_imx->res->start, resource_size(i2c_imx->res));
aa11e38c
DA		 620 iounmap(i2c_imx->base);
621 kfree(i2c_imx);
622 return 0;
623}
624
625static struct platform_driver i2c_imx_driver = {
626 .probe = i2c_imx_probe,
627 .remove = __exit_p(i2c_imx_remove),
628 .driver = {
629 .name = DRIVER_NAME,
630 .owner = THIS_MODULE,
631 }
632};
633
634static int __init i2c_adap_imx_init(void)
635{
636 return platform_driver_probe(&i2c_imx_driver, i2c_imx_probe);
637}
5d3f3331 638subsys_initcall(i2c_adap_imx_init);
aa11e38c
DA		 639
640static void __exit i2c_adap_imx_exit(void)
641{
642 platform_driver_unregister(&i2c_imx_driver);
643}
aa11e38c
DA		 644module_exit(i2c_adap_imx_exit);
645
646MODULE_LICENSE("GPL");
647MODULE_AUTHOR("Darius Augulis");
648MODULE_DESCRIPTION("I2C adapter driver for IMX I2C bus");
649MODULE_ALIAS("platform:" DRIVER_NAME);
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