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include/asm-x86/swiotlb.h: checkpatch cleanups - formatting only
[linux-2.6/libata-dev.git] / drivers / i2c / busses / i2c-omap.c
blob7ba31770d773245102b4ece0dc9393af76791a3b
1 /*
2 * TI OMAP I2C master mode driver
3 *
4 * Copyright (C) 2003 MontaVista Software, Inc.
5 * Copyright (C) 2004 Texas Instruments.
6 *
7 * Updated to work with multiple I2C interfaces on 24xx by
8 * Tony Lindgren <tony@atomide.com> and Imre Deak <imre.deak@nokia.com>
9 * Copyright (C) 2005 Nokia Corporation
10 *
11 * Cleaned up by Juha Yrjölä <juha.yrjola@nokia.com>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 */
27
28 #include <linux/module.h>
29 #include <linux/delay.h>
30 #include <linux/i2c.h>
31 #include <linux/err.h>
32 #include <linux/interrupt.h>
33 #include <linux/completion.h>
34 #include <linux/platform_device.h>
35 #include <linux/clk.h>
36
37 #include <asm/io.h>
38
39 /* timeout waiting for the controller to respond */
40 #define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000))
41
42 #define OMAP_I2C_REV_REG 0x00
43 #define OMAP_I2C_IE_REG 0x04
44 #define OMAP_I2C_STAT_REG 0x08
45 #define OMAP_I2C_IV_REG 0x0c
46 #define OMAP_I2C_SYSS_REG 0x10
47 #define OMAP_I2C_BUF_REG 0x14
48 #define OMAP_I2C_CNT_REG 0x18
49 #define OMAP_I2C_DATA_REG 0x1c
50 #define OMAP_I2C_SYSC_REG 0x20
51 #define OMAP_I2C_CON_REG 0x24
52 #define OMAP_I2C_OA_REG 0x28
53 #define OMAP_I2C_SA_REG 0x2c
54 #define OMAP_I2C_PSC_REG 0x30
55 #define OMAP_I2C_SCLL_REG 0x34
56 #define OMAP_I2C_SCLH_REG 0x38
57 #define OMAP_I2C_SYSTEST_REG 0x3c
58
59 /* I2C Interrupt Enable Register (OMAP_I2C_IE): */
60 #define OMAP_I2C_IE_XRDY (1 << 4) /* TX data ready int enable */
61 #define OMAP_I2C_IE_RRDY (1 << 3) /* RX data ready int enable */
62 #define OMAP_I2C_IE_ARDY (1 << 2) /* Access ready int enable */
63 #define OMAP_I2C_IE_NACK (1 << 1) /* No ack interrupt enable */
64 #define OMAP_I2C_IE_AL (1 << 0) /* Arbitration lost int ena */
65
66 /* I2C Status Register (OMAP_I2C_STAT): */
67 #define OMAP_I2C_STAT_SBD (1 << 15) /* Single byte data */
68 #define OMAP_I2C_STAT_BB (1 << 12) /* Bus busy */
69 #define OMAP_I2C_STAT_ROVR (1 << 11) /* Receive overrun */
70 #define OMAP_I2C_STAT_XUDF (1 << 10) /* Transmit underflow */
71 #define OMAP_I2C_STAT_AAS (1 << 9) /* Address as slave */
72 #define OMAP_I2C_STAT_AD0 (1 << 8) /* Address zero */
73 #define OMAP_I2C_STAT_XRDY (1 << 4) /* Transmit data ready */
74 #define OMAP_I2C_STAT_RRDY (1 << 3) /* Receive data ready */
75 #define OMAP_I2C_STAT_ARDY (1 << 2) /* Register access ready */
76 #define OMAP_I2C_STAT_NACK (1 << 1) /* No ack interrupt enable */
77 #define OMAP_I2C_STAT_AL (1 << 0) /* Arbitration lost int ena */
78
79 /* I2C Buffer Configuration Register (OMAP_I2C_BUF): */
80 #define OMAP_I2C_BUF_RDMA_EN (1 << 15) /* RX DMA channel enable */
81 #define OMAP_I2C_BUF_XDMA_EN (1 << 7) /* TX DMA channel enable */
82
83 /* I2C Configuration Register (OMAP_I2C_CON): */
84 #define OMAP_I2C_CON_EN (1 << 15) /* I2C module enable */
85 #define OMAP_I2C_CON_BE (1 << 14) /* Big endian mode */
86 #define OMAP_I2C_CON_STB (1 << 11) /* Start byte mode (master) */
87 #define OMAP_I2C_CON_MST (1 << 10) /* Master/slave mode */
88 #define OMAP_I2C_CON_TRX (1 << 9) /* TX/RX mode (master only) */
89 #define OMAP_I2C_CON_XA (1 << 8) /* Expand address */
90 #define OMAP_I2C_CON_RM (1 << 2) /* Repeat mode (master only) */
91 #define OMAP_I2C_CON_STP (1 << 1) /* Stop cond (master only) */
92 #define OMAP_I2C_CON_STT (1 << 0) /* Start condition (master) */
93
94 /* I2C System Test Register (OMAP_I2C_SYSTEST): */
95 #ifdef DEBUG
96 #define OMAP_I2C_SYSTEST_ST_EN (1 << 15) /* System test enable */
97 #define OMAP_I2C_SYSTEST_FREE (1 << 14) /* Free running mode */
98 #define OMAP_I2C_SYSTEST_TMODE_MASK (3 << 12) /* Test mode select */
99 #define OMAP_I2C_SYSTEST_TMODE_SHIFT (12) /* Test mode select */
100 #define OMAP_I2C_SYSTEST_SCL_I (1 << 3) /* SCL line sense in */
101 #define OMAP_I2C_SYSTEST_SCL_O (1 << 2) /* SCL line drive out */
102 #define OMAP_I2C_SYSTEST_SDA_I (1 << 1) /* SDA line sense in */
103 #define OMAP_I2C_SYSTEST_SDA_O (1 << 0) /* SDA line drive out */
104 #endif
105
106 /* I2C System Status register (OMAP_I2C_SYSS): */
107 #define OMAP_I2C_SYSS_RDONE (1 << 0) /* Reset Done */
108
109 /* I2C System Configuration Register (OMAP_I2C_SYSC): */
110 #define OMAP_I2C_SYSC_SRST (1 << 1) /* Soft Reset */
111
112 /* REVISIT: Use platform_data instead of module parameters */
113 /* Fast Mode = 400 kHz, Standard = 100 kHz */
114 static int clock = 100; /* Default: 100 kHz */
115 module_param(clock, int, 0);
116 MODULE_PARM_DESC(clock, "Set I2C clock in kHz: 400=fast mode (default == 100)");
117
118 struct omap_i2c_dev {
119 struct device *dev;
120 void __iomem *base; /* virtual */
121 int irq;
122 struct clk *iclk; /* Interface clock */
123 struct clk *fclk; /* Functional clock */
124 struct completion cmd_complete;
125 struct resource *ioarea;
126 u16 cmd_err;
127 u8 *buf;
128 size_t buf_len;
129 struct i2c_adapter adapter;
130 unsigned rev1:1;
131 unsigned idle:1;
132 u16 iestate; /* Saved interrupt register */
133 };
134
135 static inline void omap_i2c_write_reg(struct omap_i2c_dev *i2c_dev,
136 int reg, u16 val)
137 {
138 __raw_writew(val, i2c_dev->base + reg);
139 }
140
141 static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg)
142 {
143 return __raw_readw(i2c_dev->base + reg);
144 }
145
146 static int omap_i2c_get_clocks(struct omap_i2c_dev *dev)
147 {
148 if (cpu_is_omap16xx() || cpu_is_omap24xx()) {
149 dev->iclk = clk_get(dev->dev, "i2c_ick");
150 if (IS_ERR(dev->iclk)) {
151 dev->iclk = NULL;
152 return -ENODEV;
153 }
154 }
155
156 dev->fclk = clk_get(dev->dev, "i2c_fck");
157 if (IS_ERR(dev->fclk)) {
158 if (dev->iclk != NULL) {
159 clk_put(dev->iclk);
160 dev->iclk = NULL;
161 }
162 dev->fclk = NULL;
163 return -ENODEV;
164 }
165
166 return 0;
167 }
168
169 static void omap_i2c_put_clocks(struct omap_i2c_dev *dev)
170 {
171 clk_put(dev->fclk);
172 dev->fclk = NULL;
173 if (dev->iclk != NULL) {
174 clk_put(dev->iclk);
175 dev->iclk = NULL;
176 }
177 }
178
179 static void omap_i2c_unidle(struct omap_i2c_dev *dev)
180 {
181 if (dev->iclk != NULL)
182 clk_enable(dev->iclk);
183 clk_enable(dev->fclk);
184 if (dev->iestate)
185 omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate);
186 dev->idle = 0;
187 }
188
189 static void omap_i2c_idle(struct omap_i2c_dev *dev)
190 {
191 u16 iv;
192
193 dev->idle = 1;
194 dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
195 omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, 0);
196 if (dev->rev1)
197 iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG); /* Read clears */
198 else
199 omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, dev->iestate);
200 clk_disable(dev->fclk);
201 if (dev->iclk != NULL)
202 clk_disable(dev->iclk);
203 }
204
205 static int omap_i2c_init(struct omap_i2c_dev *dev)
206 {
207 u16 psc = 0;
208 unsigned long fclk_rate = 12000000;
209 unsigned long timeout;
210
211 if (!dev->rev1) {
212 omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, OMAP_I2C_SYSC_SRST);
213 /* For some reason we need to set the EN bit before the
214 * reset done bit gets set. */
215 timeout = jiffies + OMAP_I2C_TIMEOUT;
216 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
217 while (!(omap_i2c_read_reg(dev, OMAP_I2C_SYSS_REG) &
218 OMAP_I2C_SYSS_RDONE)) {
219 if (time_after(jiffies, timeout)) {
220 dev_warn(dev->dev, "timeout waiting "
221 "for controller reset\n");
222 return -ETIMEDOUT;
223 }
224 msleep(1);
225 }
226 }
227 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
228
229 if (cpu_class_is_omap1()) {
230 struct clk *armxor_ck;
231
232 armxor_ck = clk_get(NULL, "armxor_ck");
233 if (IS_ERR(armxor_ck))
234 dev_warn(dev->dev, "Could not get armxor_ck\n");
235 else {
236 fclk_rate = clk_get_rate(armxor_ck);
237 clk_put(armxor_ck);
238 }
239 /* TRM for 5912 says the I2C clock must be prescaled to be
240 * between 7 - 12 MHz. The XOR input clock is typically
241 * 12, 13 or 19.2 MHz. So we should have code that produces:
242 *
243 * XOR MHz Divider Prescaler
244 * 12 1 0
245 * 13 2 1
246 * 19.2 2 1
247 */
248 if (fclk_rate > 12000000)
249 psc = fclk_rate / 12000000;
250 }
251
252 /* Setup clock prescaler to obtain approx 12MHz I2C module clock: */
253 omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, psc);
254
255 /* Program desired operating rate */
256 fclk_rate /= (psc + 1) * 1000;
257 if (psc > 2)
258 psc = 2;
259
260 omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG,
261 fclk_rate / (clock * 2) - 7 + psc);
262 omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG,
263 fclk_rate / (clock * 2) - 7 + psc);
264
265 /* Take the I2C module out of reset: */
266 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
267
268 /* Enable interrupts */
269 omap_i2c_write_reg(dev, OMAP_I2C_IE_REG,
270 (OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY |
271 OMAP_I2C_IE_ARDY | OMAP_I2C_IE_NACK |
272 OMAP_I2C_IE_AL));
273 return 0;
274 }
275
276 /*
277 * Waiting on Bus Busy
278 */
279 static int omap_i2c_wait_for_bb(struct omap_i2c_dev *dev)
280 {
281 unsigned long timeout;
282
283 timeout = jiffies + OMAP_I2C_TIMEOUT;
284 while (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG) & OMAP_I2C_STAT_BB) {
285 if (time_after(jiffies, timeout)) {
286 dev_warn(dev->dev, "timeout waiting for bus ready\n");
287 return -ETIMEDOUT;
288 }
289 msleep(1);
290 }
291
292 return 0;
293 }
294
295 /*
296 * Low level master read/write transaction.
297 */
298 static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
299 struct i2c_msg *msg, int stop)
300 {
301 struct omap_i2c_dev *dev = i2c_get_adapdata(adap);
302 int r;
303 u16 w;
304
305 dev_dbg(dev->dev, "addr: 0x%04x, len: %d, flags: 0x%x, stop: %d\n",
306 msg->addr, msg->len, msg->flags, stop);
307
308 if (msg->len == 0)
309 return -EINVAL;
310
311 omap_i2c_write_reg(dev, OMAP_I2C_SA_REG, msg->addr);
312
313 /* REVISIT: Could the STB bit of I2C_CON be used with probing? */
314 dev->buf = msg->buf;
315 dev->buf_len = msg->len;
316
317 omap_i2c_write_reg(dev, OMAP_I2C_CNT_REG, dev->buf_len);
318
319 init_completion(&dev->cmd_complete);
320 dev->cmd_err = 0;
321
322 w = OMAP_I2C_CON_EN | OMAP_I2C_CON_MST | OMAP_I2C_CON_STT;
323 if (msg->flags & I2C_M_TEN)
324 w |= OMAP_I2C_CON_XA;
325 if (!(msg->flags & I2C_M_RD))
326 w |= OMAP_I2C_CON_TRX;
327 if (stop)
328 w |= OMAP_I2C_CON_STP;
329 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
330
331 r = wait_for_completion_interruptible_timeout(&dev->cmd_complete,
332 OMAP_I2C_TIMEOUT);
333 dev->buf_len = 0;
334 if (r < 0)
335 return r;
336 if (r == 0) {
337 dev_err(dev->dev, "controller timed out\n");
338 omap_i2c_init(dev);
339 return -ETIMEDOUT;
340 }
341
342 if (likely(!dev->cmd_err))
343 return 0;
344
345 /* We have an error */
346 if (dev->cmd_err & (OMAP_I2C_STAT_AL | OMAP_I2C_STAT_ROVR |
347 OMAP_I2C_STAT_XUDF)) {
348 omap_i2c_init(dev);
349 return -EIO;
350 }
351
352 if (dev->cmd_err & OMAP_I2C_STAT_NACK) {
353 if (msg->flags & I2C_M_IGNORE_NAK)
354 return 0;
355 if (stop) {
356 w = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG);
357 w |= OMAP_I2C_CON_STP;
358 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
359 }
360 return -EREMOTEIO;
361 }
362 return -EIO;
363 }
364
365
366 /*
367 * Prepare controller for a transaction and call omap_i2c_xfer_msg
368 * to do the work during IRQ processing.
369 */
370 static int
371 omap_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
372 {
373 struct omap_i2c_dev *dev = i2c_get_adapdata(adap);
374 int i;
375 int r;
376
377 omap_i2c_unidle(dev);
378
379 if ((r = omap_i2c_wait_for_bb(dev)) < 0)
380 goto out;
381
382 for (i = 0; i < num; i++) {
383 r = omap_i2c_xfer_msg(adap, &msgs[i], (i == (num - 1)));
384 if (r != 0)
385 break;
386 }
387
388 if (r == 0)
389 r = num;
390 out:
391 omap_i2c_idle(dev);
392 return r;
393 }
394
395 static u32
396 omap_i2c_func(struct i2c_adapter *adap)
397 {
398 return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
399 }
400
401 static inline void
402 omap_i2c_complete_cmd(struct omap_i2c_dev *dev, u16 err)
403 {
404 dev->cmd_err |= err;
405 complete(&dev->cmd_complete);
406 }
407
408 static inline void
409 omap_i2c_ack_stat(struct omap_i2c_dev *dev, u16 stat)
410 {
411 omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat);
412 }
413
414 static irqreturn_t
415 omap_i2c_rev1_isr(int this_irq, void *dev_id)
416 {
417 struct omap_i2c_dev *dev = dev_id;
418 u16 iv, w;
419
420 if (dev->idle)
421 return IRQ_NONE;
422
423 iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG);
424 switch (iv) {
425 case 0x00: /* None */
426 break;
427 case 0x01: /* Arbitration lost */
428 dev_err(dev->dev, "Arbitration lost\n");
429 omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_AL);
430 break;
431 case 0x02: /* No acknowledgement */
432 omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_NACK);
433 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_STP);
434 break;
435 case 0x03: /* Register access ready */
436 omap_i2c_complete_cmd(dev, 0);
437 break;
438 case 0x04: /* Receive data ready */
439 if (dev->buf_len) {
440 w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG);
441 *dev->buf++ = w;
442 dev->buf_len--;
443 if (dev->buf_len) {
444 *dev->buf++ = w >> 8;
445 dev->buf_len--;
446 }
447 } else
448 dev_err(dev->dev, "RRDY IRQ while no data requested\n");
449 break;
450 case 0x05: /* Transmit data ready */
451 if (dev->buf_len) {
452 w = *dev->buf++;
453 dev->buf_len--;
454 if (dev->buf_len) {
455 w |= *dev->buf++ << 8;
456 dev->buf_len--;
457 }
458 omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w);
459 } else
460 dev_err(dev->dev, "XRDY IRQ while no data to send\n");
461 break;
462 default:
463 return IRQ_NONE;
464 }
465
466 return IRQ_HANDLED;
467 }
468
469 static irqreturn_t
470 omap_i2c_isr(int this_irq, void *dev_id)
471 {
472 struct omap_i2c_dev *dev = dev_id;
473 u16 bits;
474 u16 stat, w;
475 int count = 0;
476
477 if (dev->idle)
478 return IRQ_NONE;
479
480 bits = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
481 while ((stat = (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG))) & bits) {
482 dev_dbg(dev->dev, "IRQ (ISR = 0x%04x)\n", stat);
483 if (count++ == 100) {
484 dev_warn(dev->dev, "Too much work in one IRQ\n");
485 break;
486 }
487
488 omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat);
489
490 if (stat & OMAP_I2C_STAT_ARDY) {
491 omap_i2c_complete_cmd(dev, 0);
492 continue;
493 }
494 if (stat & OMAP_I2C_STAT_RRDY) {
495 w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG);
496 if (dev->buf_len) {
497 *dev->buf++ = w;
498 dev->buf_len--;
499 if (dev->buf_len) {
500 *dev->buf++ = w >> 8;
501 dev->buf_len--;
502 }
503 } else
504 dev_err(dev->dev, "RRDY IRQ while no data "
505 "requested\n");
506 omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RRDY);
507 continue;
508 }
509 if (stat & OMAP_I2C_STAT_XRDY) {
510 w = 0;
511 if (dev->buf_len) {
512 w = *dev->buf++;
513 dev->buf_len--;
514 if (dev->buf_len) {
515 w |= *dev->buf++ << 8;
516 dev->buf_len--;
517 }
518 } else
519 dev_err(dev->dev, "XRDY IRQ while no "
520 "data to send\n");
521 omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w);
522 omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XRDY);
523 continue;
524 }
525 if (stat & OMAP_I2C_STAT_ROVR) {
526 dev_err(dev->dev, "Receive overrun\n");
527 dev->cmd_err |= OMAP_I2C_STAT_ROVR;
528 }
529 if (stat & OMAP_I2C_STAT_XUDF) {
530 dev_err(dev->dev, "Transmit overflow\n");
531 dev->cmd_err |= OMAP_I2C_STAT_XUDF;
532 }
533 if (stat & OMAP_I2C_STAT_NACK) {
534 omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_NACK);
535 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG,
536 OMAP_I2C_CON_STP);
537 }
538 if (stat & OMAP_I2C_STAT_AL) {
539 dev_err(dev->dev, "Arbitration lost\n");
540 omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_AL);
541 }
542 }
543
544 return count ? IRQ_HANDLED : IRQ_NONE;
545 }
546
547 static const struct i2c_algorithm omap_i2c_algo = {
548 .master_xfer = omap_i2c_xfer,
549 .functionality = omap_i2c_func,
550 };
551
552 static int
553 omap_i2c_probe(struct platform_device *pdev)
554 {
555 struct omap_i2c_dev *dev;
556 struct i2c_adapter *adap;
557 struct resource *mem, *irq, *ioarea;
558 int r;
559
560 /* NOTE: driver uses the static register mapping */
561 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
562 if (!mem) {
563 dev_err(&pdev->dev, "no mem resource?\n");
564 return -ENODEV;
565 }
566 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
567 if (!irq) {
568 dev_err(&pdev->dev, "no irq resource?\n");
569 return -ENODEV;
570 }
571
572 ioarea = request_mem_region(mem->start, (mem->end - mem->start) + 1,
573 pdev->name);
574 if (!ioarea) {
575 dev_err(&pdev->dev, "I2C region already claimed\n");
576 return -EBUSY;
577 }
578
579 if (clock > 200)
580 clock = 400; /* Fast mode */
581 else
582 clock = 100; /* Standard mode */
583
584 dev = kzalloc(sizeof(struct omap_i2c_dev), GFP_KERNEL);
585 if (!dev) {
586 r = -ENOMEM;
587 goto err_release_region;
588 }
589
590 dev->dev = &pdev->dev;
591 dev->irq = irq->start;
592 dev->base = (void __iomem *) IO_ADDRESS(mem->start);
593 platform_set_drvdata(pdev, dev);
594
595 if ((r = omap_i2c_get_clocks(dev)) != 0)
596 goto err_free_mem;
597
598 omap_i2c_unidle(dev);
599
600 if (cpu_is_omap15xx())
601 dev->rev1 = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) < 0x20;
602
603 /* reset ASAP, clearing any IRQs */
604 omap_i2c_init(dev);
605
606 r = request_irq(dev->irq, dev->rev1 ? omap_i2c_rev1_isr : omap_i2c_isr,
607 0, pdev->name, dev);
608
609 if (r) {
610 dev_err(dev->dev, "failure requesting irq %i\n", dev->irq);
611 goto err_unuse_clocks;
612 }
613 r = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff;
614 dev_info(dev->dev, "bus %d rev%d.%d at %d kHz\n",
615 pdev->id, r >> 4, r & 0xf, clock);
616
617 adap = &dev->adapter;
618 i2c_set_adapdata(adap, dev);
619 adap->owner = THIS_MODULE;
620 adap->class = I2C_CLASS_HWMON;
621 strncpy(adap->name, "OMAP I2C adapter", sizeof(adap->name));
622 adap->algo = &omap_i2c_algo;
623 adap->dev.parent = &pdev->dev;
624
625 /* i2c device drivers may be active on return from add_adapter() */
626 adap->nr = pdev->id;
627 r = i2c_add_numbered_adapter(adap);
628 if (r) {
629 dev_err(dev->dev, "failure adding adapter\n");
630 goto err_free_irq;
631 }
632
633 omap_i2c_idle(dev);
634
635 return 0;
636
637 err_free_irq:
638 free_irq(dev->irq, dev);
639 err_unuse_clocks:
640 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
641 omap_i2c_idle(dev);
642 omap_i2c_put_clocks(dev);
643 err_free_mem:
644 platform_set_drvdata(pdev, NULL);
645 kfree(dev);
646 err_release_region:
647 release_mem_region(mem->start, (mem->end - mem->start) + 1);
648
649 return r;
650 }
651
652 static int
653 omap_i2c_remove(struct platform_device *pdev)
654 {
655 struct omap_i2c_dev *dev = platform_get_drvdata(pdev);
656 struct resource *mem;
657
658 platform_set_drvdata(pdev, NULL);
659
660 free_irq(dev->irq, dev);
661 i2c_del_adapter(&dev->adapter);
662 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
663 omap_i2c_put_clocks(dev);
664 kfree(dev);
665 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
666 release_mem_region(mem->start, (mem->end - mem->start) + 1);
667 return 0;
668 }
669
670 static struct platform_driver omap_i2c_driver = {
671 .probe = omap_i2c_probe,
672 .remove = omap_i2c_remove,
673 .driver = {
674 .name = "i2c_omap",
675 .owner = THIS_MODULE,
676 },
677 };
678
679 /* I2C may be needed to bring up other drivers */
680 static int __init
681 omap_i2c_init_driver(void)
682 {
683 return platform_driver_register(&omap_i2c_driver);
684 }
685 subsys_initcall(omap_i2c_init_driver);
686
687 static void __exit omap_i2c_exit_driver(void)
688 {
689 platform_driver_unregister(&omap_i2c_driver);
690 }
691 module_exit(omap_i2c_exit_driver);
692
693 MODULE_AUTHOR("MontaVista Software, Inc. (and others)");
694 MODULE_DESCRIPTION("TI OMAP I2C bus adapter");
695 MODULE_LICENSE("GPL");
Linux 2.6 libata-dev (mirror)