blob: ec15cff556b9a9b4d3e8bd12d9d221215bfd0892 [file] [log] [blame]
Vitaly Wool41561f22006-12-10 21:21:29 +01001/*
2 * Provides I2C support for Philips PNX010x/PNX4008 boards.
3 *
4 * Authors: Dennis Kovalev <dkovalev@ru.mvista.com>
5 * Vitaly Wool <vwool@ru.mvista.com>
6 *
7 * 2004-2006 (c) MontaVista Software, Inc. This file is licensed under
8 * the terms of the GNU General Public License version 2. This program
9 * is licensed "as is" without any warranty of any kind, whether express
10 * or implied.
11 */
12
13#include <linux/module.h>
14#include <linux/interrupt.h>
15#include <linux/ioport.h>
16#include <linux/delay.h>
17#include <linux/i2c.h>
18#include <linux/timer.h>
19#include <linux/completion.h>
20#include <linux/platform_device.h>
21#include <linux/i2c-pnx.h>
Russell Kinga09e64f2008-08-05 16:14:15 +010022#include <mach/hardware.h>
Vitaly Wool41561f22006-12-10 21:21:29 +010023#include <asm/irq.h>
24#include <asm/uaccess.h>
25
26#define I2C_PNX_TIMEOUT 10 /* msec */
27#define I2C_PNX_SPEED_KHZ 100
28#define I2C_PNX_REGION_SIZE 0x100
29#define PNX_DEFAULT_FREQ 13 /* MHz */
30
31static inline int wait_timeout(long timeout, struct i2c_pnx_algo_data *data)
32{
33 while (timeout > 0 &&
34 (ioread32(I2C_REG_STS(data)) & mstatus_active)) {
35 mdelay(1);
36 timeout--;
37 }
38 return (timeout <= 0);
39}
40
41static inline int wait_reset(long timeout, struct i2c_pnx_algo_data *data)
42{
43 while (timeout > 0 &&
44 (ioread32(I2C_REG_CTL(data)) & mcntrl_reset)) {
45 mdelay(1);
46 timeout--;
47 }
48 return (timeout <= 0);
49}
50
51static inline void i2c_pnx_arm_timer(struct i2c_adapter *adap)
52{
53 struct i2c_pnx_algo_data *data = adap->algo_data;
54 struct timer_list *timer = &data->mif.timer;
55 int expires = I2C_PNX_TIMEOUT / (1000 / HZ);
56
57 del_timer_sync(timer);
58
59 dev_dbg(&adap->dev, "Timer armed at %lu plus %u jiffies.\n",
60 jiffies, expires);
61
62 timer->expires = jiffies + expires;
63 timer->data = (unsigned long)adap;
64
65 add_timer(timer);
66}
67
68/**
69 * i2c_pnx_start - start a device
70 * @slave_addr: slave address
71 * @adap: pointer to adapter structure
72 *
73 * Generate a START signal in the desired mode.
74 */
75static int i2c_pnx_start(unsigned char slave_addr, struct i2c_adapter *adap)
76{
77 struct i2c_pnx_algo_data *alg_data = adap->algo_data;
78
Harvey Harrison08882d22008-04-22 22:16:47 +020079 dev_dbg(&adap->dev, "%s(): addr 0x%x mode %d\n", __func__,
Vitaly Wool41561f22006-12-10 21:21:29 +010080 slave_addr, alg_data->mif.mode);
81
82 /* Check for 7 bit slave addresses only */
83 if (slave_addr & ~0x7f) {
84 dev_err(&adap->dev, "%s: Invalid slave address %x. "
85 "Only 7-bit addresses are supported\n",
86 adap->name, slave_addr);
87 return -EINVAL;
88 }
89
90 /* First, make sure bus is idle */
91 if (wait_timeout(I2C_PNX_TIMEOUT, alg_data)) {
92 /* Somebody else is monopolizing the bus */
93 dev_err(&adap->dev, "%s: Bus busy. Slave addr = %02x, "
94 "cntrl = %x, stat = %x\n",
95 adap->name, slave_addr,
96 ioread32(I2C_REG_CTL(alg_data)),
97 ioread32(I2C_REG_STS(alg_data)));
98 return -EBUSY;
99 } else if (ioread32(I2C_REG_STS(alg_data)) & mstatus_afi) {
100 /* Sorry, we lost the bus */
101 dev_err(&adap->dev, "%s: Arbitration failure. "
102 "Slave addr = %02x\n", adap->name, slave_addr);
103 return -EIO;
104 }
105
106 /*
107 * OK, I2C is enabled and we have the bus.
108 * Clear the current TDI and AFI status flags.
109 */
110 iowrite32(ioread32(I2C_REG_STS(alg_data)) | mstatus_tdi | mstatus_afi,
111 I2C_REG_STS(alg_data));
112
Harvey Harrison08882d22008-04-22 22:16:47 +0200113 dev_dbg(&adap->dev, "%s(): sending %#x\n", __func__,
Vitaly Wool41561f22006-12-10 21:21:29 +0100114 (slave_addr << 1) | start_bit | alg_data->mif.mode);
115
116 /* Write the slave address, START bit and R/W bit */
117 iowrite32((slave_addr << 1) | start_bit | alg_data->mif.mode,
118 I2C_REG_TX(alg_data));
119
Harvey Harrison08882d22008-04-22 22:16:47 +0200120 dev_dbg(&adap->dev, "%s(): exit\n", __func__);
Vitaly Wool41561f22006-12-10 21:21:29 +0100121
122 return 0;
123}
124
125/**
126 * i2c_pnx_stop - stop a device
127 * @adap: pointer to I2C adapter structure
128 *
129 * Generate a STOP signal to terminate the master transaction.
130 */
131static void i2c_pnx_stop(struct i2c_adapter *adap)
132{
133 struct i2c_pnx_algo_data *alg_data = adap->algo_data;
134 /* Only 1 msec max timeout due to interrupt context */
135 long timeout = 1000;
136
137 dev_dbg(&adap->dev, "%s(): entering: stat = %04x.\n",
Harvey Harrison08882d22008-04-22 22:16:47 +0200138 __func__, ioread32(I2C_REG_STS(alg_data)));
Vitaly Wool41561f22006-12-10 21:21:29 +0100139
140 /* Write a STOP bit to TX FIFO */
141 iowrite32(0xff | stop_bit, I2C_REG_TX(alg_data));
142
143 /* Wait until the STOP is seen. */
144 while (timeout > 0 &&
145 (ioread32(I2C_REG_STS(alg_data)) & mstatus_active)) {
146 /* may be called from interrupt context */
147 udelay(1);
148 timeout--;
149 }
150
151 dev_dbg(&adap->dev, "%s(): exiting: stat = %04x.\n",
Harvey Harrison08882d22008-04-22 22:16:47 +0200152 __func__, ioread32(I2C_REG_STS(alg_data)));
Vitaly Wool41561f22006-12-10 21:21:29 +0100153}
154
155/**
156 * i2c_pnx_master_xmit - transmit data to slave
157 * @adap: pointer to I2C adapter structure
158 *
159 * Sends one byte of data to the slave
160 */
161static int i2c_pnx_master_xmit(struct i2c_adapter *adap)
162{
163 struct i2c_pnx_algo_data *alg_data = adap->algo_data;
164 u32 val;
165
166 dev_dbg(&adap->dev, "%s(): entering: stat = %04x.\n",
Harvey Harrison08882d22008-04-22 22:16:47 +0200167 __func__, ioread32(I2C_REG_STS(alg_data)));
Vitaly Wool41561f22006-12-10 21:21:29 +0100168
169 if (alg_data->mif.len > 0) {
170 /* We still have something to talk about... */
171 val = *alg_data->mif.buf++;
172
173 if (alg_data->mif.len == 1) {
174 val |= stop_bit;
175 if (!alg_data->last)
176 val |= start_bit;
177 }
178
179 alg_data->mif.len--;
180 iowrite32(val, I2C_REG_TX(alg_data));
181
Harvey Harrison08882d22008-04-22 22:16:47 +0200182 dev_dbg(&adap->dev, "%s(): xmit %#x [%d]\n", __func__,
Vitaly Wool41561f22006-12-10 21:21:29 +0100183 val, alg_data->mif.len + 1);
184
185 if (alg_data->mif.len == 0) {
186 if (alg_data->last) {
187 /* Wait until the STOP is seen. */
188 if (wait_timeout(I2C_PNX_TIMEOUT, alg_data))
189 dev_err(&adap->dev, "The bus is still "
190 "active after timeout\n");
191 }
192 /* Disable master interrupts */
193 iowrite32(ioread32(I2C_REG_CTL(alg_data)) &
194 ~(mcntrl_afie | mcntrl_naie | mcntrl_drmie),
195 I2C_REG_CTL(alg_data));
196
197 del_timer_sync(&alg_data->mif.timer);
198
199 dev_dbg(&adap->dev, "%s(): Waking up xfer routine.\n",
Harvey Harrison08882d22008-04-22 22:16:47 +0200200 __func__);
Vitaly Wool41561f22006-12-10 21:21:29 +0100201
202 complete(&alg_data->mif.complete);
203 }
204 } else if (alg_data->mif.len == 0) {
205 /* zero-sized transfer */
206 i2c_pnx_stop(adap);
207
208 /* Disable master interrupts. */
209 iowrite32(ioread32(I2C_REG_CTL(alg_data)) &
210 ~(mcntrl_afie | mcntrl_naie | mcntrl_drmie),
211 I2C_REG_CTL(alg_data));
212
213 /* Stop timer. */
214 del_timer_sync(&alg_data->mif.timer);
215 dev_dbg(&adap->dev, "%s(): Waking up xfer routine after "
Harvey Harrison08882d22008-04-22 22:16:47 +0200216 "zero-xfer.\n", __func__);
Vitaly Wool41561f22006-12-10 21:21:29 +0100217
218 complete(&alg_data->mif.complete);
219 }
220
221 dev_dbg(&adap->dev, "%s(): exiting: stat = %04x.\n",
Harvey Harrison08882d22008-04-22 22:16:47 +0200222 __func__, ioread32(I2C_REG_STS(alg_data)));
Vitaly Wool41561f22006-12-10 21:21:29 +0100223
224 return 0;
225}
226
227/**
228 * i2c_pnx_master_rcv - receive data from slave
229 * @adap: pointer to I2C adapter structure
230 *
231 * Reads one byte data from the slave
232 */
233static int i2c_pnx_master_rcv(struct i2c_adapter *adap)
234{
235 struct i2c_pnx_algo_data *alg_data = adap->algo_data;
236 unsigned int val = 0;
237 u32 ctl = 0;
238
239 dev_dbg(&adap->dev, "%s(): entering: stat = %04x.\n",
Harvey Harrison08882d22008-04-22 22:16:47 +0200240 __func__, ioread32(I2C_REG_STS(alg_data)));
Vitaly Wool41561f22006-12-10 21:21:29 +0100241
242 /* Check, whether there is already data,
243 * or we didn't 'ask' for it yet.
244 */
245 if (ioread32(I2C_REG_STS(alg_data)) & mstatus_rfe) {
246 dev_dbg(&adap->dev, "%s(): Write dummy data to fill "
Harvey Harrison08882d22008-04-22 22:16:47 +0200247 "Rx-fifo...\n", __func__);
Vitaly Wool41561f22006-12-10 21:21:29 +0100248
249 if (alg_data->mif.len == 1) {
250 /* Last byte, do not acknowledge next rcv. */
251 val |= stop_bit;
252 if (!alg_data->last)
253 val |= start_bit;
254
255 /*
256 * Enable interrupt RFDAIE (data in Rx fifo),
257 * and disable DRMIE (need data for Tx)
258 */
259 ctl = ioread32(I2C_REG_CTL(alg_data));
260 ctl |= mcntrl_rffie | mcntrl_daie;
261 ctl &= ~mcntrl_drmie;
262 iowrite32(ctl, I2C_REG_CTL(alg_data));
263 }
264
265 /*
266 * Now we'll 'ask' for data:
267 * For each byte we want to receive, we must
268 * write a (dummy) byte to the Tx-FIFO.
269 */
270 iowrite32(val, I2C_REG_TX(alg_data));
271
272 return 0;
273 }
274
275 /* Handle data. */
276 if (alg_data->mif.len > 0) {
277 val = ioread32(I2C_REG_RX(alg_data));
278 *alg_data->mif.buf++ = (u8) (val & 0xff);
Harvey Harrison08882d22008-04-22 22:16:47 +0200279 dev_dbg(&adap->dev, "%s(): rcv 0x%x [%d]\n", __func__, val,
Vitaly Wool41561f22006-12-10 21:21:29 +0100280 alg_data->mif.len);
281
282 alg_data->mif.len--;
283 if (alg_data->mif.len == 0) {
284 if (alg_data->last)
285 /* Wait until the STOP is seen. */
286 if (wait_timeout(I2C_PNX_TIMEOUT, alg_data))
287 dev_err(&adap->dev, "The bus is still "
288 "active after timeout\n");
289
290 /* Disable master interrupts */
291 ctl = ioread32(I2C_REG_CTL(alg_data));
292 ctl &= ~(mcntrl_afie | mcntrl_naie | mcntrl_rffie |
293 mcntrl_drmie | mcntrl_daie);
294 iowrite32(ctl, I2C_REG_CTL(alg_data));
295
296 /* Kill timer. */
297 del_timer_sync(&alg_data->mif.timer);
298 complete(&alg_data->mif.complete);
299 }
300 }
301
302 dev_dbg(&adap->dev, "%s(): exiting: stat = %04x.\n",
Harvey Harrison08882d22008-04-22 22:16:47 +0200303 __func__, ioread32(I2C_REG_STS(alg_data)));
Vitaly Wool41561f22006-12-10 21:21:29 +0100304
305 return 0;
306}
307
Vitaly Wool6c566fb2007-01-04 13:07:03 +0100308static irqreturn_t i2c_pnx_interrupt(int irq, void *dev_id)
Vitaly Wool41561f22006-12-10 21:21:29 +0100309{
310 u32 stat, ctl;
311 struct i2c_adapter *adap = dev_id;
312 struct i2c_pnx_algo_data *alg_data = adap->algo_data;
313
314 dev_dbg(&adap->dev, "%s(): mstat = %x mctrl = %x, mode = %d\n",
Harvey Harrison08882d22008-04-22 22:16:47 +0200315 __func__,
Vitaly Wool41561f22006-12-10 21:21:29 +0100316 ioread32(I2C_REG_STS(alg_data)),
317 ioread32(I2C_REG_CTL(alg_data)),
318 alg_data->mif.mode);
319 stat = ioread32(I2C_REG_STS(alg_data));
320
321 /* let's see what kind of event this is */
322 if (stat & mstatus_afi) {
323 /* We lost arbitration in the midst of a transfer */
324 alg_data->mif.ret = -EIO;
325
326 /* Disable master interrupts. */
327 ctl = ioread32(I2C_REG_CTL(alg_data));
328 ctl &= ~(mcntrl_afie | mcntrl_naie | mcntrl_rffie |
329 mcntrl_drmie);
330 iowrite32(ctl, I2C_REG_CTL(alg_data));
331
332 /* Stop timer, to prevent timeout. */
333 del_timer_sync(&alg_data->mif.timer);
334 complete(&alg_data->mif.complete);
335 } else if (stat & mstatus_nai) {
336 /* Slave did not acknowledge, generate a STOP */
337 dev_dbg(&adap->dev, "%s(): "
338 "Slave did not acknowledge, generating a STOP.\n",
Harvey Harrison08882d22008-04-22 22:16:47 +0200339 __func__);
Vitaly Wool41561f22006-12-10 21:21:29 +0100340 i2c_pnx_stop(adap);
341
342 /* Disable master interrupts. */
343 ctl = ioread32(I2C_REG_CTL(alg_data));
344 ctl &= ~(mcntrl_afie | mcntrl_naie | mcntrl_rffie |
345 mcntrl_drmie);
346 iowrite32(ctl, I2C_REG_CTL(alg_data));
347
348 /* Our return value. */
349 alg_data->mif.ret = -EIO;
350
351 /* Stop timer, to prevent timeout. */
352 del_timer_sync(&alg_data->mif.timer);
353 complete(&alg_data->mif.complete);
354 } else {
355 /*
356 * Two options:
357 * - Master Tx needs data.
358 * - There is data in the Rx-fifo
359 * The latter is only the case if we have requested for data,
360 * via a dummy write. (See 'i2c_pnx_master_rcv'.)
361 * We therefore check, as a sanity check, whether that interrupt
362 * has been enabled.
363 */
364 if ((stat & mstatus_drmi) || !(stat & mstatus_rfe)) {
365 if (alg_data->mif.mode == I2C_SMBUS_WRITE) {
366 i2c_pnx_master_xmit(adap);
367 } else if (alg_data->mif.mode == I2C_SMBUS_READ) {
368 i2c_pnx_master_rcv(adap);
369 }
370 }
371 }
372
373 /* Clear TDI and AFI bits */
374 stat = ioread32(I2C_REG_STS(alg_data));
375 iowrite32(stat | mstatus_tdi | mstatus_afi, I2C_REG_STS(alg_data));
376
377 dev_dbg(&adap->dev, "%s(): exiting, stat = %x ctrl = %x.\n",
Harvey Harrison08882d22008-04-22 22:16:47 +0200378 __func__, ioread32(I2C_REG_STS(alg_data)),
Vitaly Wool41561f22006-12-10 21:21:29 +0100379 ioread32(I2C_REG_CTL(alg_data)));
380
381 return IRQ_HANDLED;
382}
383
384static void i2c_pnx_timeout(unsigned long data)
385{
386 struct i2c_adapter *adap = (struct i2c_adapter *)data;
387 struct i2c_pnx_algo_data *alg_data = adap->algo_data;
388 u32 ctl;
389
390 dev_err(&adap->dev, "Master timed out. stat = %04x, cntrl = %04x. "
391 "Resetting master...\n",
392 ioread32(I2C_REG_STS(alg_data)),
393 ioread32(I2C_REG_CTL(alg_data)));
394
395 /* Reset master and disable interrupts */
396 ctl = ioread32(I2C_REG_CTL(alg_data));
397 ctl &= ~(mcntrl_afie | mcntrl_naie | mcntrl_rffie | mcntrl_drmie);
398 iowrite32(ctl, I2C_REG_CTL(alg_data));
399
400 ctl |= mcntrl_reset;
401 iowrite32(ctl, I2C_REG_CTL(alg_data));
402 wait_reset(I2C_PNX_TIMEOUT, alg_data);
403 alg_data->mif.ret = -EIO;
404 complete(&alg_data->mif.complete);
405}
406
407static inline void bus_reset_if_active(struct i2c_adapter *adap)
408{
409 struct i2c_pnx_algo_data *alg_data = adap->algo_data;
410 u32 stat;
411
412 if ((stat = ioread32(I2C_REG_STS(alg_data))) & mstatus_active) {
413 dev_err(&adap->dev,
414 "%s: Bus is still active after xfer. Reset it...\n",
415 adap->name);
416 iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset,
417 I2C_REG_CTL(alg_data));
418 wait_reset(I2C_PNX_TIMEOUT, alg_data);
419 } else if (!(stat & mstatus_rfe) || !(stat & mstatus_tfe)) {
420 /* If there is data in the fifo's after transfer,
421 * flush fifo's by reset.
422 */
423 iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset,
424 I2C_REG_CTL(alg_data));
425 wait_reset(I2C_PNX_TIMEOUT, alg_data);
426 } else if (stat & mstatus_nai) {
427 iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset,
428 I2C_REG_CTL(alg_data));
429 wait_reset(I2C_PNX_TIMEOUT, alg_data);
430 }
431}
432
433/**
434 * i2c_pnx_xfer - generic transfer entry point
435 * @adap: pointer to I2C adapter structure
436 * @msgs: array of messages
437 * @num: number of messages
438 *
439 * Initiates the transfer
440 */
441static int
442i2c_pnx_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
443{
444 struct i2c_msg *pmsg;
445 int rc = 0, completed = 0, i;
446 struct i2c_pnx_algo_data *alg_data = adap->algo_data;
447 u32 stat = ioread32(I2C_REG_STS(alg_data));
448
449 dev_dbg(&adap->dev, "%s(): entering: %d messages, stat = %04x.\n",
Harvey Harrison08882d22008-04-22 22:16:47 +0200450 __func__, num, ioread32(I2C_REG_STS(alg_data)));
Vitaly Wool41561f22006-12-10 21:21:29 +0100451
452 bus_reset_if_active(adap);
453
454 /* Process transactions in a loop. */
455 for (i = 0; rc >= 0 && i < num; i++) {
456 u8 addr;
457
458 pmsg = &msgs[i];
459 addr = pmsg->addr;
460
461 if (pmsg->flags & I2C_M_TEN) {
462 dev_err(&adap->dev,
463 "%s: 10 bits addr not supported!\n",
464 adap->name);
465 rc = -EINVAL;
466 break;
467 }
468
469 alg_data->mif.buf = pmsg->buf;
470 alg_data->mif.len = pmsg->len;
471 alg_data->mif.mode = (pmsg->flags & I2C_M_RD) ?
472 I2C_SMBUS_READ : I2C_SMBUS_WRITE;
473 alg_data->mif.ret = 0;
474 alg_data->last = (i == num - 1);
475
Harvey Harrison08882d22008-04-22 22:16:47 +0200476 dev_dbg(&adap->dev, "%s(): mode %d, %d bytes\n", __func__,
Vitaly Wool41561f22006-12-10 21:21:29 +0100477 alg_data->mif.mode,
478 alg_data->mif.len);
479
480 i2c_pnx_arm_timer(adap);
481
482 /* initialize the completion var */
483 init_completion(&alg_data->mif.complete);
484
485 /* Enable master interrupt */
486 iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_afie |
487 mcntrl_naie | mcntrl_drmie,
488 I2C_REG_CTL(alg_data));
489
490 /* Put start-code and slave-address on the bus. */
491 rc = i2c_pnx_start(addr, adap);
492 if (rc < 0)
493 break;
494
495 /* Wait for completion */
496 wait_for_completion(&alg_data->mif.complete);
497
498 if (!(rc = alg_data->mif.ret))
499 completed++;
500 dev_dbg(&adap->dev, "%s(): Complete, return code = %d.\n",
Harvey Harrison08882d22008-04-22 22:16:47 +0200501 __func__, rc);
Vitaly Wool41561f22006-12-10 21:21:29 +0100502
503 /* Clear TDI and AFI bits in case they are set. */
504 if ((stat = ioread32(I2C_REG_STS(alg_data))) & mstatus_tdi) {
505 dev_dbg(&adap->dev,
506 "%s: TDI still set... clearing now.\n",
507 adap->name);
508 iowrite32(stat, I2C_REG_STS(alg_data));
509 }
510 if ((stat = ioread32(I2C_REG_STS(alg_data))) & mstatus_afi) {
511 dev_dbg(&adap->dev,
512 "%s: AFI still set... clearing now.\n",
513 adap->name);
514 iowrite32(stat, I2C_REG_STS(alg_data));
515 }
516 }
517
518 bus_reset_if_active(adap);
519
520 /* Cleanup to be sure... */
521 alg_data->mif.buf = NULL;
522 alg_data->mif.len = 0;
523
524 dev_dbg(&adap->dev, "%s(): exiting, stat = %x\n",
Harvey Harrison08882d22008-04-22 22:16:47 +0200525 __func__, ioread32(I2C_REG_STS(alg_data)));
Vitaly Wool41561f22006-12-10 21:21:29 +0100526
527 if (completed != num)
528 return ((rc < 0) ? rc : -EREMOTEIO);
529
530 return num;
531}
532
533static u32 i2c_pnx_func(struct i2c_adapter *adapter)
534{
535 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
536}
537
538static struct i2c_algorithm pnx_algorithm = {
539 .master_xfer = i2c_pnx_xfer,
540 .functionality = i2c_pnx_func,
541};
542
543static int i2c_pnx_controller_suspend(struct platform_device *pdev,
544 pm_message_t state)
545{
546 struct i2c_pnx_data *i2c_pnx = platform_get_drvdata(pdev);
547 return i2c_pnx->suspend(pdev, state);
548}
549
550static int i2c_pnx_controller_resume(struct platform_device *pdev)
551{
552 struct i2c_pnx_data *i2c_pnx = platform_get_drvdata(pdev);
553 return i2c_pnx->resume(pdev);
554}
555
556static int __devinit i2c_pnx_probe(struct platform_device *pdev)
557{
558 unsigned long tmp;
559 int ret = 0;
560 struct i2c_pnx_algo_data *alg_data;
561 int freq_mhz;
562 struct i2c_pnx_data *i2c_pnx = pdev->dev.platform_data;
563
564 if (!i2c_pnx || !i2c_pnx->adapter) {
565 dev_err(&pdev->dev, "%s: no platform data supplied\n",
Harvey Harrison08882d22008-04-22 22:16:47 +0200566 __func__);
Vitaly Wool41561f22006-12-10 21:21:29 +0100567 ret = -EINVAL;
568 goto out;
569 }
570
571 platform_set_drvdata(pdev, i2c_pnx);
572
573 if (i2c_pnx->calculate_input_freq)
574 freq_mhz = i2c_pnx->calculate_input_freq(pdev);
575 else {
576 freq_mhz = PNX_DEFAULT_FREQ;
577 dev_info(&pdev->dev, "Setting bus frequency to default value: "
Joe Perches898eb712007-10-18 03:06:30 -0700578 "%d MHz\n", freq_mhz);
Vitaly Wool41561f22006-12-10 21:21:29 +0100579 }
580
581 i2c_pnx->adapter->algo = &pnx_algorithm;
582
583 alg_data = i2c_pnx->adapter->algo_data;
584 init_timer(&alg_data->mif.timer);
585 alg_data->mif.timer.function = i2c_pnx_timeout;
586 alg_data->mif.timer.data = (unsigned long)i2c_pnx->adapter;
587
588 /* Register I/O resource */
589 if (!request_region(alg_data->base, I2C_PNX_REGION_SIZE, pdev->name)) {
590 dev_err(&pdev->dev,
591 "I/O region 0x%08x for I2C already in use.\n",
592 alg_data->base);
593 ret = -ENODEV;
594 goto out_drvdata;
595 }
596
597 if (!(alg_data->ioaddr =
598 (u32)ioremap(alg_data->base, I2C_PNX_REGION_SIZE))) {
599 dev_err(&pdev->dev, "Couldn't ioremap I2C I/O region\n");
600 ret = -ENOMEM;
601 goto out_release;
602 }
603
604 i2c_pnx->set_clock_run(pdev);
605
606 /*
607 * Clock Divisor High This value is the number of system clocks
608 * the serial clock (SCL) will be high.
609 * For example, if the system clock period is 50 ns and the maximum
610 * desired serial period is 10000 ns (100 kHz), then CLKHI would be
611 * set to 0.5*(f_sys/f_i2c)-2=0.5*(20e6/100e3)-2=98. The actual value
612 * programmed into CLKHI will vary from this slightly due to
613 * variations in the output pad's rise and fall times as well as
614 * the deglitching filter length.
615 */
616
617 tmp = ((freq_mhz * 1000) / I2C_PNX_SPEED_KHZ) / 2 - 2;
618 iowrite32(tmp, I2C_REG_CKH(alg_data));
619 iowrite32(tmp, I2C_REG_CKL(alg_data));
620
621 iowrite32(mcntrl_reset, I2C_REG_CTL(alg_data));
622 if (wait_reset(I2C_PNX_TIMEOUT, alg_data)) {
623 ret = -ENODEV;
624 goto out_unmap;
625 }
626 init_completion(&alg_data->mif.complete);
627
628 ret = request_irq(alg_data->irq, i2c_pnx_interrupt,
629 0, pdev->name, i2c_pnx->adapter);
630 if (ret)
631 goto out_clock;
632
633 /* Register this adapter with the I2C subsystem */
634 i2c_pnx->adapter->dev.parent = &pdev->dev;
635 ret = i2c_add_adapter(i2c_pnx->adapter);
636 if (ret < 0) {
637 dev_err(&pdev->dev, "I2C: Failed to add bus\n");
638 goto out_irq;
639 }
640
641 dev_dbg(&pdev->dev, "%s: Master at %#8x, irq %d.\n",
642 i2c_pnx->adapter->name, alg_data->base, alg_data->irq);
643
644 return 0;
645
646out_irq:
647 free_irq(alg_data->irq, alg_data);
648out_clock:
649 i2c_pnx->set_clock_stop(pdev);
650out_unmap:
651 iounmap((void *)alg_data->ioaddr);
652out_release:
653 release_region(alg_data->base, I2C_PNX_REGION_SIZE);
654out_drvdata:
655 platform_set_drvdata(pdev, NULL);
656out:
657 return ret;
658}
659
660static int __devexit i2c_pnx_remove(struct platform_device *pdev)
661{
662 struct i2c_pnx_data *i2c_pnx = platform_get_drvdata(pdev);
663 struct i2c_adapter *adap = i2c_pnx->adapter;
664 struct i2c_pnx_algo_data *alg_data = adap->algo_data;
665
666 free_irq(alg_data->irq, alg_data);
667 i2c_del_adapter(adap);
668 i2c_pnx->set_clock_stop(pdev);
669 iounmap((void *)alg_data->ioaddr);
670 release_region(alg_data->base, I2C_PNX_REGION_SIZE);
671 platform_set_drvdata(pdev, NULL);
672
673 return 0;
674}
675
676static struct platform_driver i2c_pnx_driver = {
677 .driver = {
678 .name = "pnx-i2c",
679 .owner = THIS_MODULE,
680 },
681 .probe = i2c_pnx_probe,
682 .remove = __devexit_p(i2c_pnx_remove),
683 .suspend = i2c_pnx_controller_suspend,
684 .resume = i2c_pnx_controller_resume,
685};
686
687static int __init i2c_adap_pnx_init(void)
688{
689 return platform_driver_register(&i2c_pnx_driver);
690}
691
692static void __exit i2c_adap_pnx_exit(void)
693{
694 platform_driver_unregister(&i2c_pnx_driver);
695}
696
697MODULE_AUTHOR("Vitaly Wool, Dennis Kovalev <source@mvista.com>");
698MODULE_DESCRIPTION("I2C driver for Philips IP3204-based I2C busses");
699MODULE_LICENSE("GPL");
Kay Sieversadd8eda2008-04-22 22:16:49 +0200700MODULE_ALIAS("platform:pnx-i2c");
Vitaly Wool41561f22006-12-10 21:21:29 +0100701
Vitaly Wool41561f22006-12-10 21:21:29 +0100702/* We need to make sure I2C is initialized before USB */
703subsys_initcall(i2c_adap_pnx_init);
Vitaly Wool41561f22006-12-10 21:21:29 +0100704module_exit(i2c_adap_pnx_exit);