]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/i2c/busses/i2c-pxa.c
projects / mirror_ubuntu-artful-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'for-4.4' of git://git.osdn.jp/gitroot/uclinux-h8/linux
[mirror_ubuntu-artful-kernel.git] / drivers / i2c / busses / i2c-pxa.c
1 /*
2 * i2c_adap_pxa.c
3 *
4 * I2C adapter for the PXA I2C bus access.
5 *
6 * Copyright (C) 2002 Intrinsyc Software Inc.
7 * Copyright (C) 2004-2005 Deep Blue Solutions Ltd.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 * History:
14 * Apr 2002: Initial version [CS]
15 * Jun 2002: Properly separated algo/adap [FB]
16 * Jan 2003: Fixed several bugs concerning interrupt handling [Kai-Uwe Bloem]
17 * Jan 2003: added limited signal handling [Kai-Uwe Bloem]
18 * Sep 2004: Major rework to ensure efficient bus handling [RMK]
19 * Dec 2004: Added support for PXA27x and slave device probing [Liam Girdwood]
20 * Feb 2005: Rework slave mode handling [RMK]
21 */
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/i2c.h>
25 #include <linux/init.h>
26 #include <linux/time.h>
27 #include <linux/sched.h>
28 #include <linux/delay.h>
29 #include <linux/errno.h>
30 #include <linux/interrupt.h>
31 #include <linux/i2c-pxa.h>
32 #include <linux/of.h>
33 #include <linux/of_device.h>
34 #include <linux/platform_device.h>
35 #include <linux/err.h>
36 #include <linux/clk.h>
37 #include <linux/slab.h>
38 #include <linux/io.h>
39 #include <linux/i2c/pxa-i2c.h>
40
41 #include <asm/irq.h>
42
43 struct pxa_reg_layout {
44 u32 ibmr;
45 u32 idbr;
46 u32 icr;
47 u32 isr;
48 u32 isar;
49 u32 ilcr;
50 u32 iwcr;
51 };
52
53 enum pxa_i2c_types {
54 REGS_PXA2XX,
55 REGS_PXA3XX,
56 REGS_CE4100,
57 REGS_PXA910,
58 };
59
60 /*
61 * I2C registers definitions
62 */
63 static struct pxa_reg_layout pxa_reg_layout[] = {
64 [REGS_PXA2XX] = {
65 .ibmr = 0x00,
66 .idbr = 0x08,
67 .icr = 0x10,
68 .isr = 0x18,
69 .isar = 0x20,
70 },
71 [REGS_PXA3XX] = {
72 .ibmr = 0x00,
73 .idbr = 0x04,
74 .icr = 0x08,
75 .isr = 0x0c,
76 .isar = 0x10,
77 },
78 [REGS_CE4100] = {
79 .ibmr = 0x14,
80 .idbr = 0x0c,
81 .icr = 0x00,
82 .isr = 0x04,
83 /* no isar register */
84 },
85 [REGS_PXA910] = {
86 .ibmr = 0x00,
87 .idbr = 0x08,
88 .icr = 0x10,
89 .isr = 0x18,
90 .isar = 0x20,
91 .ilcr = 0x28,
92 .iwcr = 0x30,
93 },
94 };
95
96 static const struct platform_device_id i2c_pxa_id_table[] = {
97 { "pxa2xx-i2c", REGS_PXA2XX },
98 { "pxa3xx-pwri2c", REGS_PXA3XX },
99 { "ce4100-i2c", REGS_CE4100 },
100 { "pxa910-i2c", REGS_PXA910 },
101 { },
102 };
103 MODULE_DEVICE_TABLE(platform, i2c_pxa_id_table);
104
105 /*
106 * I2C bit definitions
107 */
108
109 #define ICR_START (1 << 0) /* start bit */
110 #define ICR_STOP (1 << 1) /* stop bit */
111 #define ICR_ACKNAK (1 << 2) /* send ACK(0) or NAK(1) */
112 #define ICR_TB (1 << 3) /* transfer byte bit */
113 #define ICR_MA (1 << 4) /* master abort */
114 #define ICR_SCLE (1 << 5) /* master clock enable */
115 #define ICR_IUE (1 << 6) /* unit enable */
116 #define ICR_GCD (1 << 7) /* general call disable */
117 #define ICR_ITEIE (1 << 8) /* enable tx interrupts */
118 #define ICR_IRFIE (1 << 9) /* enable rx interrupts */
119 #define ICR_BEIE (1 << 10) /* enable bus error ints */
120 #define ICR_SSDIE (1 << 11) /* slave STOP detected int enable */
121 #define ICR_ALDIE (1 << 12) /* enable arbitration interrupt */
122 #define ICR_SADIE (1 << 13) /* slave address detected int enable */
123 #define ICR_UR (1 << 14) /* unit reset */
124 #define ICR_FM (1 << 15) /* fast mode */
125 #define ICR_HS (1 << 16) /* High Speed mode */
126 #define ICR_GPIOEN (1 << 19) /* enable GPIO mode for SCL in HS */
127
128 #define ISR_RWM (1 << 0) /* read/write mode */
129 #define ISR_ACKNAK (1 << 1) /* ack/nak status */
130 #define ISR_UB (1 << 2) /* unit busy */
131 #define ISR_IBB (1 << 3) /* bus busy */
132 #define ISR_SSD (1 << 4) /* slave stop detected */
133 #define ISR_ALD (1 << 5) /* arbitration loss detected */
134 #define ISR_ITE (1 << 6) /* tx buffer empty */
135 #define ISR_IRF (1 << 7) /* rx buffer full */
136 #define ISR_GCAD (1 << 8) /* general call address detected */
137 #define ISR_SAD (1 << 9) /* slave address detected */
138 #define ISR_BED (1 << 10) /* bus error no ACK/NAK */
139
140 /* bit field shift & mask */
141 #define ILCR_SLV_SHIFT 0
142 #define ILCR_SLV_MASK (0x1FF << ILCR_SLV_SHIFT)
143 #define ILCR_FLV_SHIFT 9
144 #define ILCR_FLV_MASK (0x1FF << ILCR_FLV_SHIFT)
145 #define ILCR_HLVL_SHIFT 18
146 #define ILCR_HLVL_MASK (0x1FF << ILCR_HLVL_SHIFT)
147 #define ILCR_HLVH_SHIFT 27
148 #define ILCR_HLVH_MASK (0x1F << ILCR_HLVH_SHIFT)
149
150 #define IWCR_CNT_SHIFT 0
151 #define IWCR_CNT_MASK (0x1F << IWCR_CNT_SHIFT)
152 #define IWCR_HS_CNT1_SHIFT 5
153 #define IWCR_HS_CNT1_MASK (0x1F << IWCR_HS_CNT1_SHIFT)
154 #define IWCR_HS_CNT2_SHIFT 10
155 #define IWCR_HS_CNT2_MASK (0x1F << IWCR_HS_CNT2_SHIFT)
156
157 struct pxa_i2c {
158 spinlock_t lock;
159 wait_queue_head_t wait;
160 struct i2c_msg *msg;
161 unsigned int msg_num;
162 unsigned int msg_idx;
163 unsigned int msg_ptr;
164 unsigned int slave_addr;
165 unsigned int req_slave_addr;
166
167 struct i2c_adapter adap;
168 struct clk *clk;
169 #ifdef CONFIG_I2C_PXA_SLAVE
170 struct i2c_slave_client *slave;
171 #endif
172
173 unsigned int irqlogidx;
174 u32 isrlog[32];
175 u32 icrlog[32];
176
177 void __iomem *reg_base;
178 void __iomem *reg_ibmr;
179 void __iomem *reg_idbr;
180 void __iomem *reg_icr;
181 void __iomem *reg_isr;
182 void __iomem *reg_isar;
183 void __iomem *reg_ilcr;
184 void __iomem *reg_iwcr;
185
186 unsigned long iobase;
187 unsigned long iosize;
188
189 int irq;
190 unsigned int use_pio :1;
191 unsigned int fast_mode :1;
192 unsigned int high_mode:1;
193 unsigned char master_code;
194 unsigned long rate;
195 bool highmode_enter;
196 };
197
198 #define _IBMR(i2c) ((i2c)->reg_ibmr)
199 #define _IDBR(i2c) ((i2c)->reg_idbr)
200 #define _ICR(i2c) ((i2c)->reg_icr)
201 #define _ISR(i2c) ((i2c)->reg_isr)
202 #define _ISAR(i2c) ((i2c)->reg_isar)
203 #define _ILCR(i2c) ((i2c)->reg_ilcr)
204 #define _IWCR(i2c) ((i2c)->reg_iwcr)
205
206 /*
207 * I2C Slave mode address
208 */
209 #define I2C_PXA_SLAVE_ADDR 0x1
210
211 #ifdef DEBUG
212
213 struct bits {
214 u32 mask;
215 const char *set;
216 const char *unset;
217 };
218 #define PXA_BIT(m, s, u) { .mask = m, .set = s, .unset = u }
219
220 static inline void
221 decode_bits(const char *prefix, const struct bits *bits, int num, u32 val)
222 {
223 printk("%s %08x: ", prefix, val);
224 while (num--) {
225 const char *str = val & bits->mask ? bits->set : bits->unset;
226 if (str)
227 printk("%s ", str);
228 bits++;
229 }
230 }
231
232 static const struct bits isr_bits[] = {
233 PXA_BIT(ISR_RWM, "RX", "TX"),
234 PXA_BIT(ISR_ACKNAK, "NAK", "ACK"),
235 PXA_BIT(ISR_UB, "Bsy", "Rdy"),
236 PXA_BIT(ISR_IBB, "BusBsy", "BusRdy"),
237 PXA_BIT(ISR_SSD, "SlaveStop", NULL),
238 PXA_BIT(ISR_ALD, "ALD", NULL),
239 PXA_BIT(ISR_ITE, "TxEmpty", NULL),
240 PXA_BIT(ISR_IRF, "RxFull", NULL),
241 PXA_BIT(ISR_GCAD, "GenCall", NULL),
242 PXA_BIT(ISR_SAD, "SlaveAddr", NULL),
243 PXA_BIT(ISR_BED, "BusErr", NULL),
244 };
245
246 static void decode_ISR(unsigned int val)
247 {
248 decode_bits(KERN_DEBUG "ISR", isr_bits, ARRAY_SIZE(isr_bits), val);
249 printk("\n");
250 }
251
252 static const struct bits icr_bits[] = {
253 PXA_BIT(ICR_START, "START", NULL),
254 PXA_BIT(ICR_STOP, "STOP", NULL),
255 PXA_BIT(ICR_ACKNAK, "ACKNAK", NULL),
256 PXA_BIT(ICR_TB, "TB", NULL),
257 PXA_BIT(ICR_MA, "MA", NULL),
258 PXA_BIT(ICR_SCLE, "SCLE", "scle"),
259 PXA_BIT(ICR_IUE, "IUE", "iue"),
260 PXA_BIT(ICR_GCD, "GCD", NULL),
261 PXA_BIT(ICR_ITEIE, "ITEIE", NULL),
262 PXA_BIT(ICR_IRFIE, "IRFIE", NULL),
263 PXA_BIT(ICR_BEIE, "BEIE", NULL),
264 PXA_BIT(ICR_SSDIE, "SSDIE", NULL),
265 PXA_BIT(ICR_ALDIE, "ALDIE", NULL),
266 PXA_BIT(ICR_SADIE, "SADIE", NULL),
267 PXA_BIT(ICR_UR, "UR", "ur"),
268 };
269
270 #ifdef CONFIG_I2C_PXA_SLAVE
271 static void decode_ICR(unsigned int val)
272 {
273 decode_bits(KERN_DEBUG "ICR", icr_bits, ARRAY_SIZE(icr_bits), val);
274 printk("\n");
275 }
276 #endif
277
278 static unsigned int i2c_debug = DEBUG;
279
280 static void i2c_pxa_show_state(struct pxa_i2c *i2c, int lno, const char *fname)
281 {
282 dev_dbg(&i2c->adap.dev, "state:%s:%d: ISR=%08x, ICR=%08x, IBMR=%02x\n", fname, lno,
283 readl(_ISR(i2c)), readl(_ICR(i2c)), readl(_IBMR(i2c)));
284 }
285
286 #define show_state(i2c) i2c_pxa_show_state(i2c, __LINE__, __func__)
287
288 static void i2c_pxa_scream_blue_murder(struct pxa_i2c *i2c, const char *why)
289 {
290 unsigned int i;
291 struct device *dev = &i2c->adap.dev;
292
293 dev_err(dev, "slave_0x%x error: %s\n",
294 i2c->req_slave_addr >> 1, why);
295 dev_err(dev, "msg_num: %d msg_idx: %d msg_ptr: %d\n",
296 i2c->msg_num, i2c->msg_idx, i2c->msg_ptr);
297 dev_err(dev, "IBMR: %08x IDBR: %08x ICR: %08x ISR: %08x\n",
298 readl(_IBMR(i2c)), readl(_IDBR(i2c)), readl(_ICR(i2c)),
299 readl(_ISR(i2c)));
300 dev_dbg(dev, "log: ");
301 for (i = 0; i < i2c->irqlogidx; i++)
302 pr_debug("[%08x:%08x] ", i2c->isrlog[i], i2c->icrlog[i]);
303
304 pr_debug("\n");
305 }
306
307 #else /* ifdef DEBUG */
308
309 #define i2c_debug 0
310
311 #define show_state(i2c) do { } while (0)
312 #define decode_ISR(val) do { } while (0)
313 #define decode_ICR(val) do { } while (0)
314 #define i2c_pxa_scream_blue_murder(i2c, why) do { } while (0)
315
316 #endif /* ifdef DEBUG / else */
317
318 static void i2c_pxa_master_complete(struct pxa_i2c *i2c, int ret);
319 static irqreturn_t i2c_pxa_handler(int this_irq, void *dev_id);
320
321 static inline int i2c_pxa_is_slavemode(struct pxa_i2c *i2c)
322 {
323 return !(readl(_ICR(i2c)) & ICR_SCLE);
324 }
325
326 static void i2c_pxa_abort(struct pxa_i2c *i2c)
327 {
328 int i = 250;
329
330 if (i2c_pxa_is_slavemode(i2c)) {
331 dev_dbg(&i2c->adap.dev, "%s: called in slave mode\n", __func__);
332 return;
333 }
334
335 while ((i > 0) && (readl(_IBMR(i2c)) & 0x1) == 0) {
336 unsigned long icr = readl(_ICR(i2c));
337
338 icr &= ~ICR_START;
339 icr |= ICR_ACKNAK | ICR_STOP | ICR_TB;
340
341 writel(icr, _ICR(i2c));
342
343 show_state(i2c);
344
345 mdelay(1);
346 i --;
347 }
348
349 writel(readl(_ICR(i2c)) & ~(ICR_MA | ICR_START | ICR_STOP),
350 _ICR(i2c));
351 }
352
353 static int i2c_pxa_wait_bus_not_busy(struct pxa_i2c *i2c)
354 {
355 int timeout = DEF_TIMEOUT;
356
357 while (timeout-- && readl(_ISR(i2c)) & (ISR_IBB | ISR_UB)) {
358 if ((readl(_ISR(i2c)) & ISR_SAD) != 0)
359 timeout += 4;
360
361 msleep(2);
362 show_state(i2c);
363 }
364
365 if (timeout < 0)
366 show_state(i2c);
367
368 return timeout < 0 ? I2C_RETRY : 0;
369 }
370
371 static int i2c_pxa_wait_master(struct pxa_i2c *i2c)
372 {
373 unsigned long timeout = jiffies + HZ*4;
374
375 while (time_before(jiffies, timeout)) {
376 if (i2c_debug > 1)
377 dev_dbg(&i2c->adap.dev, "%s: %ld: ISR=%08x, ICR=%08x, IBMR=%02x\n",
378 __func__, (long)jiffies, readl(_ISR(i2c)), readl(_ICR(i2c)), readl(_IBMR(i2c)));
379
380 if (readl(_ISR(i2c)) & ISR_SAD) {
381 if (i2c_debug > 0)
382 dev_dbg(&i2c->adap.dev, "%s: Slave detected\n", __func__);
383 goto out;
384 }
385
386 /* wait for unit and bus being not busy, and we also do a
387 * quick check of the i2c lines themselves to ensure they've
388 * gone high...
389 */
390 if ((readl(_ISR(i2c)) & (ISR_UB | ISR_IBB)) == 0 && readl(_IBMR(i2c)) == 3) {
391 if (i2c_debug > 0)
392 dev_dbg(&i2c->adap.dev, "%s: done\n", __func__);
393 return 1;
394 }
395
396 msleep(1);
397 }
398
399 if (i2c_debug > 0)
400 dev_dbg(&i2c->adap.dev, "%s: did not free\n", __func__);
401 out:
402 return 0;
403 }
404
405 static int i2c_pxa_set_master(struct pxa_i2c *i2c)
406 {
407 if (i2c_debug)
408 dev_dbg(&i2c->adap.dev, "setting to bus master\n");
409
410 if ((readl(_ISR(i2c)) & (ISR_UB | ISR_IBB)) != 0) {
411 dev_dbg(&i2c->adap.dev, "%s: unit is busy\n", __func__);
412 if (!i2c_pxa_wait_master(i2c)) {
413 dev_dbg(&i2c->adap.dev, "%s: error: unit busy\n", __func__);
414 return I2C_RETRY;
415 }
416 }
417
418 writel(readl(_ICR(i2c)) | ICR_SCLE, _ICR(i2c));
419 return 0;
420 }
421
422 #ifdef CONFIG_I2C_PXA_SLAVE
423 static int i2c_pxa_wait_slave(struct pxa_i2c *i2c)
424 {
425 unsigned long timeout = jiffies + HZ*1;
426
427 /* wait for stop */
428
429 show_state(i2c);
430
431 while (time_before(jiffies, timeout)) {
432 if (i2c_debug > 1)
433 dev_dbg(&i2c->adap.dev, "%s: %ld: ISR=%08x, ICR=%08x, IBMR=%02x\n",
434 __func__, (long)jiffies, readl(_ISR(i2c)), readl(_ICR(i2c)), readl(_IBMR(i2c)));
435
436 if ((readl(_ISR(i2c)) & (ISR_UB|ISR_IBB)) == 0 ||
437 (readl(_ISR(i2c)) & ISR_SAD) != 0 ||
438 (readl(_ICR(i2c)) & ICR_SCLE) == 0) {
439 if (i2c_debug > 1)
440 dev_dbg(&i2c->adap.dev, "%s: done\n", __func__);
441 return 1;
442 }
443
444 msleep(1);
445 }
446
447 if (i2c_debug > 0)
448 dev_dbg(&i2c->adap.dev, "%s: did not free\n", __func__);
449 return 0;
450 }
451
452 /*
453 * clear the hold on the bus, and take of anything else
454 * that has been configured
455 */
456 static void i2c_pxa_set_slave(struct pxa_i2c *i2c, int errcode)
457 {
458 show_state(i2c);
459
460 if (errcode < 0) {
461 udelay(100); /* simple delay */
462 } else {
463 /* we need to wait for the stop condition to end */
464
465 /* if we where in stop, then clear... */
466 if (readl(_ICR(i2c)) & ICR_STOP) {
467 udelay(100);
468 writel(readl(_ICR(i2c)) & ~ICR_STOP, _ICR(i2c));
469 }
470
471 if (!i2c_pxa_wait_slave(i2c)) {
472 dev_err(&i2c->adap.dev, "%s: wait timedout\n",
473 __func__);
474 return;
475 }
476 }
477
478 writel(readl(_ICR(i2c)) & ~(ICR_STOP|ICR_ACKNAK|ICR_MA), _ICR(i2c));
479 writel(readl(_ICR(i2c)) & ~ICR_SCLE, _ICR(i2c));
480
481 if (i2c_debug) {
482 dev_dbg(&i2c->adap.dev, "ICR now %08x, ISR %08x\n", readl(_ICR(i2c)), readl(_ISR(i2c)));
483 decode_ICR(readl(_ICR(i2c)));
484 }
485 }
486 #else
487 #define i2c_pxa_set_slave(i2c, err) do { } while (0)
488 #endif
489
490 static void i2c_pxa_reset(struct pxa_i2c *i2c)
491 {
492 pr_debug("Resetting I2C Controller Unit\n");
493
494 /* abort any transfer currently under way */
495 i2c_pxa_abort(i2c);
496
497 /* reset according to 9.8 */
498 writel(ICR_UR, _ICR(i2c));
499 writel(I2C_ISR_INIT, _ISR(i2c));
500 writel(readl(_ICR(i2c)) & ~ICR_UR, _ICR(i2c));
501
502 if (i2c->reg_isar && IS_ENABLED(CONFIG_I2C_PXA_SLAVE))
503 writel(i2c->slave_addr, _ISAR(i2c));
504
505 /* set control register values */
506 writel(I2C_ICR_INIT | (i2c->fast_mode ? ICR_FM : 0), _ICR(i2c));
507 writel(readl(_ICR(i2c)) | (i2c->high_mode ? ICR_HS : 0), _ICR(i2c));
508
509 #ifdef CONFIG_I2C_PXA_SLAVE
510 dev_info(&i2c->adap.dev, "Enabling slave mode\n");
511 writel(readl(_ICR(i2c)) | ICR_SADIE | ICR_ALDIE | ICR_SSDIE, _ICR(i2c));
512 #endif
513
514 i2c_pxa_set_slave(i2c, 0);
515
516 /* enable unit */
517 writel(readl(_ICR(i2c)) | ICR_IUE, _ICR(i2c));
518 udelay(100);
519 }
520
521
522 #ifdef CONFIG_I2C_PXA_SLAVE
523 /*
524 * PXA I2C Slave mode
525 */
526
527 static void i2c_pxa_slave_txempty(struct pxa_i2c *i2c, u32 isr)
528 {
529 if (isr & ISR_BED) {
530 /* what should we do here? */
531 } else {
532 int ret = 0;
533
534 if (i2c->slave != NULL)
535 ret = i2c->slave->read(i2c->slave->data);
536
537 writel(ret, _IDBR(i2c));
538 writel(readl(_ICR(i2c)) | ICR_TB, _ICR(i2c)); /* allow next byte */
539 }
540 }
541
542 static void i2c_pxa_slave_rxfull(struct pxa_i2c *i2c, u32 isr)
543 {
544 unsigned int byte = readl(_IDBR(i2c));
545
546 if (i2c->slave != NULL)
547 i2c->slave->write(i2c->slave->data, byte);
548
549 writel(readl(_ICR(i2c)) | ICR_TB, _ICR(i2c));
550 }
551
552 static void i2c_pxa_slave_start(struct pxa_i2c *i2c, u32 isr)
553 {
554 int timeout;
555
556 if (i2c_debug > 0)
557 dev_dbg(&i2c->adap.dev, "SAD, mode is slave-%cx\n",
558 (isr & ISR_RWM) ? 'r' : 't');
559
560 if (i2c->slave != NULL)
561 i2c->slave->event(i2c->slave->data,
562 (isr & ISR_RWM) ? I2C_SLAVE_EVENT_START_READ : I2C_SLAVE_EVENT_START_WRITE);
563
564 /*
565 * slave could interrupt in the middle of us generating a
566 * start condition... if this happens, we'd better back off
567 * and stop holding the poor thing up
568 */
569 writel(readl(_ICR(i2c)) & ~(ICR_START|ICR_STOP), _ICR(i2c));
570 writel(readl(_ICR(i2c)) | ICR_TB, _ICR(i2c));
571
572 timeout = 0x10000;
573
574 while (1) {
575 if ((readl(_IBMR(i2c)) & 2) == 2)
576 break;
577
578 timeout--;
579
580 if (timeout <= 0) {
581 dev_err(&i2c->adap.dev, "timeout waiting for SCL high\n");
582 break;
583 }
584 }
585
586 writel(readl(_ICR(i2c)) & ~ICR_SCLE, _ICR(i2c));
587 }
588
589 static void i2c_pxa_slave_stop(struct pxa_i2c *i2c)
590 {
591 if (i2c_debug > 2)
592 dev_dbg(&i2c->adap.dev, "ISR: SSD (Slave Stop)\n");
593
594 if (i2c->slave != NULL)
595 i2c->slave->event(i2c->slave->data, I2C_SLAVE_EVENT_STOP);
596
597 if (i2c_debug > 2)
598 dev_dbg(&i2c->adap.dev, "ISR: SSD (Slave Stop) acked\n");
599
600 /*
601 * If we have a master-mode message waiting,
602 * kick it off now that the slave has completed.
603 */
604 if (i2c->msg)
605 i2c_pxa_master_complete(i2c, I2C_RETRY);
606 }
607 #else
608 static void i2c_pxa_slave_txempty(struct pxa_i2c *i2c, u32 isr)
609 {
610 if (isr & ISR_BED) {
611 /* what should we do here? */
612 } else {
613 writel(0, _IDBR(i2c));
614 writel(readl(_ICR(i2c)) | ICR_TB, _ICR(i2c));
615 }
616 }
617
618 static void i2c_pxa_slave_rxfull(struct pxa_i2c *i2c, u32 isr)
619 {
620 writel(readl(_ICR(i2c)) | ICR_TB | ICR_ACKNAK, _ICR(i2c));
621 }
622
623 static void i2c_pxa_slave_start(struct pxa_i2c *i2c, u32 isr)
624 {
625 int timeout;
626
627 /*
628 * slave could interrupt in the middle of us generating a
629 * start condition... if this happens, we'd better back off
630 * and stop holding the poor thing up
631 */
632 writel(readl(_ICR(i2c)) & ~(ICR_START|ICR_STOP), _ICR(i2c));
633 writel(readl(_ICR(i2c)) | ICR_TB | ICR_ACKNAK, _ICR(i2c));
634
635 timeout = 0x10000;
636
637 while (1) {
638 if ((readl(_IBMR(i2c)) & 2) == 2)
639 break;
640
641 timeout--;
642
643 if (timeout <= 0) {
644 dev_err(&i2c->adap.dev, "timeout waiting for SCL high\n");
645 break;
646 }
647 }
648
649 writel(readl(_ICR(i2c)) & ~ICR_SCLE, _ICR(i2c));
650 }
651
652 static void i2c_pxa_slave_stop(struct pxa_i2c *i2c)
653 {
654 if (i2c->msg)
655 i2c_pxa_master_complete(i2c, I2C_RETRY);
656 }
657 #endif
658
659 /*
660 * PXA I2C Master mode
661 */
662
663 static inline unsigned int i2c_pxa_addr_byte(struct i2c_msg *msg)
664 {
665 unsigned int addr = (msg->addr & 0x7f) << 1;
666
667 if (msg->flags & I2C_M_RD)
668 addr |= 1;
669
670 return addr;
671 }
672
673 static inline void i2c_pxa_start_message(struct pxa_i2c *i2c)
674 {
675 u32 icr;
676
677 /*
678 * Step 1: target slave address into IDBR
679 */
680 writel(i2c_pxa_addr_byte(i2c->msg), _IDBR(i2c));
681 i2c->req_slave_addr = i2c_pxa_addr_byte(i2c->msg);
682
683 /*
684 * Step 2: initiate the write.
685 */
686 icr = readl(_ICR(i2c)) & ~(ICR_STOP | ICR_ALDIE);
687 writel(icr | ICR_START | ICR_TB, _ICR(i2c));
688 }
689
690 static inline void i2c_pxa_stop_message(struct pxa_i2c *i2c)
691 {
692 u32 icr;
693
694 /*
695 * Clear the STOP and ACK flags
696 */
697 icr = readl(_ICR(i2c));
698 icr &= ~(ICR_STOP | ICR_ACKNAK);
699 writel(icr, _ICR(i2c));
700 }
701
702 static int i2c_pxa_pio_set_master(struct pxa_i2c *i2c)
703 {
704 /* make timeout the same as for interrupt based functions */
705 long timeout = 2 * DEF_TIMEOUT;
706
707 /*
708 * Wait for the bus to become free.
709 */
710 while (timeout-- && readl(_ISR(i2c)) & (ISR_IBB | ISR_UB)) {
711 udelay(1000);
712 show_state(i2c);
713 }
714
715 if (timeout < 0) {
716 show_state(i2c);
717 dev_err(&i2c->adap.dev,
718 "i2c_pxa: timeout waiting for bus free\n");
719 return I2C_RETRY;
720 }
721
722 /*
723 * Set master mode.
724 */
725 writel(readl(_ICR(i2c)) | ICR_SCLE, _ICR(i2c));
726
727 return 0;
728 }
729
730 /*
731 * PXA I2C send master code
732 * 1. Load master code to IDBR and send it.
733 * Note for HS mode, set ICR [GPIOEN].
734 * 2. Wait until win arbitration.
735 */
736 static int i2c_pxa_send_mastercode(struct pxa_i2c *i2c)
737 {
738 u32 icr;
739 long timeout;
740
741 spin_lock_irq(&i2c->lock);
742 i2c->highmode_enter = true;
743 writel(i2c->master_code, _IDBR(i2c));
744
745 icr = readl(_ICR(i2c)) & ~(ICR_STOP | ICR_ALDIE);
746 icr |= ICR_GPIOEN | ICR_START | ICR_TB | ICR_ITEIE;
747 writel(icr, _ICR(i2c));
748
749 spin_unlock_irq(&i2c->lock);
750 timeout = wait_event_timeout(i2c->wait,
751 i2c->highmode_enter == false, HZ * 1);
752
753 i2c->highmode_enter = false;
754
755 return (timeout == 0) ? I2C_RETRY : 0;
756 }
757
758 static int i2c_pxa_do_pio_xfer(struct pxa_i2c *i2c,
759 struct i2c_msg *msg, int num)
760 {
761 unsigned long timeout = 500000; /* 5 seconds */
762 int ret = 0;
763
764 ret = i2c_pxa_pio_set_master(i2c);
765 if (ret)
766 goto out;
767
768 i2c->msg = msg;
769 i2c->msg_num = num;
770 i2c->msg_idx = 0;
771 i2c->msg_ptr = 0;
772 i2c->irqlogidx = 0;
773
774 i2c_pxa_start_message(i2c);
775
776 while (i2c->msg_num > 0 && --timeout) {
777 i2c_pxa_handler(0, i2c);
778 udelay(10);
779 }
780
781 i2c_pxa_stop_message(i2c);
782
783 /*
784 * We place the return code in i2c->msg_idx.
785 */
786 ret = i2c->msg_idx;
787
788 out:
789 if (timeout == 0) {
790 i2c_pxa_scream_blue_murder(i2c, "timeout");
791 ret = I2C_RETRY;
792 }
793
794 return ret;
795 }
796
797 /*
798 * We are protected by the adapter bus mutex.
799 */
800 static int i2c_pxa_do_xfer(struct pxa_i2c *i2c, struct i2c_msg *msg, int num)
801 {
802 long timeout;
803 int ret;
804
805 /*
806 * Wait for the bus to become free.
807 */
808 ret = i2c_pxa_wait_bus_not_busy(i2c);
809 if (ret) {
810 dev_err(&i2c->adap.dev, "i2c_pxa: timeout waiting for bus free\n");
811 goto out;
812 }
813
814 /*
815 * Set master mode.
816 */
817 ret = i2c_pxa_set_master(i2c);
818 if (ret) {
819 dev_err(&i2c->adap.dev, "i2c_pxa_set_master: error %d\n", ret);
820 goto out;
821 }
822
823 if (i2c->high_mode) {
824 ret = i2c_pxa_send_mastercode(i2c);
825 if (ret) {
826 dev_err(&i2c->adap.dev, "i2c_pxa_send_mastercode timeout\n");
827 goto out;
828 }
829 }
830
831 spin_lock_irq(&i2c->lock);
832
833 i2c->msg = msg;
834 i2c->msg_num = num;
835 i2c->msg_idx = 0;
836 i2c->msg_ptr = 0;
837 i2c->irqlogidx = 0;
838
839 i2c_pxa_start_message(i2c);
840
841 spin_unlock_irq(&i2c->lock);
842
843 /*
844 * The rest of the processing occurs in the interrupt handler.
845 */
846 timeout = wait_event_timeout(i2c->wait, i2c->msg_num == 0, HZ * 5);
847 i2c_pxa_stop_message(i2c);
848
849 /*
850 * We place the return code in i2c->msg_idx.
851 */
852 ret = i2c->msg_idx;
853
854 if (!timeout && i2c->msg_num) {
855 i2c_pxa_scream_blue_murder(i2c, "timeout");
856 ret = I2C_RETRY;
857 }
858
859 out:
860 return ret;
861 }
862
863 static int i2c_pxa_pio_xfer(struct i2c_adapter *adap,
864 struct i2c_msg msgs[], int num)
865 {
866 struct pxa_i2c *i2c = adap->algo_data;
867 int ret, i;
868
869 /* If the I2C controller is disabled we need to reset it
870 (probably due to a suspend/resume destroying state). We do
871 this here as we can then avoid worrying about resuming the
872 controller before its users. */
873 if (!(readl(_ICR(i2c)) & ICR_IUE))
874 i2c_pxa_reset(i2c);
875
876 for (i = adap->retries; i >= 0; i--) {
877 ret = i2c_pxa_do_pio_xfer(i2c, msgs, num);
878 if (ret != I2C_RETRY)
879 goto out;
880
881 if (i2c_debug)
882 dev_dbg(&adap->dev, "Retrying transmission\n");
883 udelay(100);
884 }
885 i2c_pxa_scream_blue_murder(i2c, "exhausted retries");
886 ret = -EREMOTEIO;
887 out:
888 i2c_pxa_set_slave(i2c, ret);
889 return ret;
890 }
891
892 /*
893 * i2c_pxa_master_complete - complete the message and wake up.
894 */
895 static void i2c_pxa_master_complete(struct pxa_i2c *i2c, int ret)
896 {
897 i2c->msg_ptr = 0;
898 i2c->msg = NULL;
899 i2c->msg_idx ++;
900 i2c->msg_num = 0;
901 if (ret)
902 i2c->msg_idx = ret;
903 if (!i2c->use_pio)
904 wake_up(&i2c->wait);
905 }
906
907 static void i2c_pxa_irq_txempty(struct pxa_i2c *i2c, u32 isr)
908 {
909 u32 icr = readl(_ICR(i2c)) & ~(ICR_START|ICR_STOP|ICR_ACKNAK|ICR_TB);
910
911 again:
912 /*
913 * If ISR_ALD is set, we lost arbitration.
914 */
915 if (isr & ISR_ALD) {
916 /*
917 * Do we need to do anything here? The PXA docs
918 * are vague about what happens.
919 */
920 i2c_pxa_scream_blue_murder(i2c, "ALD set");
921
922 /*
923 * We ignore this error. We seem to see spurious ALDs
924 * for seemingly no reason. If we handle them as I think
925 * they should, we end up causing an I2C error, which
926 * is painful for some systems.
927 */
928 return; /* ignore */
929 }
930
931 if ((isr & ISR_BED) &&
932 (!((i2c->msg->flags & I2C_M_IGNORE_NAK) &&
933 (isr & ISR_ACKNAK)))) {
934 int ret = BUS_ERROR;
935
936 /*
937 * I2C bus error - either the device NAK'd us, or
938 * something more serious happened. If we were NAK'd
939 * on the initial address phase, we can retry.
940 */
941 if (isr & ISR_ACKNAK) {
942 if (i2c->msg_ptr == 0 && i2c->msg_idx == 0)
943 ret = I2C_RETRY;
944 else
945 ret = XFER_NAKED;
946 }
947 i2c_pxa_master_complete(i2c, ret);
948 } else if (isr & ISR_RWM) {
949 /*
950 * Read mode. We have just sent the address byte, and
951 * now we must initiate the transfer.
952 */
953 if (i2c->msg_ptr == i2c->msg->len - 1 &&
954 i2c->msg_idx == i2c->msg_num - 1)
955 icr |= ICR_STOP | ICR_ACKNAK;
956
957 icr |= ICR_ALDIE | ICR_TB;
958 } else if (i2c->msg_ptr < i2c->msg->len) {
959 /*
960 * Write mode. Write the next data byte.
961 */
962 writel(i2c->msg->buf[i2c->msg_ptr++], _IDBR(i2c));
963
964 icr |= ICR_ALDIE | ICR_TB;
965
966 /*
967 * If this is the last byte of the last message or last byte
968 * of any message with I2C_M_STOP (e.g. SCCB), send a STOP.
969 */
970 if ((i2c->msg_ptr == i2c->msg->len) &&
971 ((i2c->msg->flags & I2C_M_STOP) ||
972 (i2c->msg_idx == i2c->msg_num - 1)))
973 icr |= ICR_STOP;
974
975 } else if (i2c->msg_idx < i2c->msg_num - 1) {
976 /*
977 * Next segment of the message.
978 */
979 i2c->msg_ptr = 0;
980 i2c->msg_idx ++;
981 i2c->msg++;
982
983 /*
984 * If we aren't doing a repeated start and address,
985 * go back and try to send the next byte. Note that
986 * we do not support switching the R/W direction here.
987 */
988 if (i2c->msg->flags & I2C_M_NOSTART)
989 goto again;
990
991 /*
992 * Write the next address.
993 */
994 writel(i2c_pxa_addr_byte(i2c->msg), _IDBR(i2c));
995 i2c->req_slave_addr = i2c_pxa_addr_byte(i2c->msg);
996
997 /*
998 * And trigger a repeated start, and send the byte.
999 */
1000 icr &= ~ICR_ALDIE;
1001 icr |= ICR_START | ICR_TB;
1002 } else {
1003 if (i2c->msg->len == 0) {
1004 /*
1005 * Device probes have a message length of zero
1006 * and need the bus to be reset before it can
1007 * be used again.
1008 */
1009 i2c_pxa_reset(i2c);
1010 }
1011 i2c_pxa_master_complete(i2c, 0);
1012 }
1013
1014 i2c->icrlog[i2c->irqlogidx-1] = icr;
1015
1016 writel(icr, _ICR(i2c));
1017 show_state(i2c);
1018 }
1019
1020 static void i2c_pxa_irq_rxfull(struct pxa_i2c *i2c, u32 isr)
1021 {
1022 u32 icr = readl(_ICR(i2c)) & ~(ICR_START|ICR_STOP|ICR_ACKNAK|ICR_TB);
1023
1024 /*
1025 * Read the byte.
1026 */
1027 i2c->msg->buf[i2c->msg_ptr++] = readl(_IDBR(i2c));
1028
1029 if (i2c->msg_ptr < i2c->msg->len) {
1030 /*
1031 * If this is the last byte of the last
1032 * message, send a STOP.
1033 */
1034 if (i2c->msg_ptr == i2c->msg->len - 1)
1035 icr |= ICR_STOP | ICR_ACKNAK;
1036
1037 icr |= ICR_ALDIE | ICR_TB;
1038 } else {
1039 i2c_pxa_master_complete(i2c, 0);
1040 }
1041
1042 i2c->icrlog[i2c->irqlogidx-1] = icr;
1043
1044 writel(icr, _ICR(i2c));
1045 }
1046
1047 #define VALID_INT_SOURCE (ISR_SSD | ISR_ALD | ISR_ITE | ISR_IRF | \
1048 ISR_SAD | ISR_BED)
1049 static irqreturn_t i2c_pxa_handler(int this_irq, void *dev_id)
1050 {
1051 struct pxa_i2c *i2c = dev_id;
1052 u32 isr = readl(_ISR(i2c));
1053
1054 if (!(isr & VALID_INT_SOURCE))
1055 return IRQ_NONE;
1056
1057 if (i2c_debug > 2 && 0) {
1058 dev_dbg(&i2c->adap.dev, "%s: ISR=%08x, ICR=%08x, IBMR=%02x\n",
1059 __func__, isr, readl(_ICR(i2c)), readl(_IBMR(i2c)));
1060 decode_ISR(isr);
1061 }
1062
1063 if (i2c->irqlogidx < ARRAY_SIZE(i2c->isrlog))
1064 i2c->isrlog[i2c->irqlogidx++] = isr;
1065
1066 show_state(i2c);
1067
1068 /*
1069 * Always clear all pending IRQs.
1070 */
1071 writel(isr & VALID_INT_SOURCE, _ISR(i2c));
1072
1073 if (isr & ISR_SAD)
1074 i2c_pxa_slave_start(i2c, isr);
1075 if (isr & ISR_SSD)
1076 i2c_pxa_slave_stop(i2c);
1077
1078 if (i2c_pxa_is_slavemode(i2c)) {
1079 if (isr & ISR_ITE)
1080 i2c_pxa_slave_txempty(i2c, isr);
1081 if (isr & ISR_IRF)
1082 i2c_pxa_slave_rxfull(i2c, isr);
1083 } else if (i2c->msg && (!i2c->highmode_enter)) {
1084 if (isr & ISR_ITE)
1085 i2c_pxa_irq_txempty(i2c, isr);
1086 if (isr & ISR_IRF)
1087 i2c_pxa_irq_rxfull(i2c, isr);
1088 } else if ((isr & ISR_ITE) && i2c->highmode_enter) {
1089 i2c->highmode_enter = false;
1090 wake_up(&i2c->wait);
1091 } else {
1092 i2c_pxa_scream_blue_murder(i2c, "spurious irq");
1093 }
1094
1095 return IRQ_HANDLED;
1096 }
1097
1098
1099 static int i2c_pxa_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
1100 {
1101 struct pxa_i2c *i2c = adap->algo_data;
1102 int ret, i;
1103
1104 for (i = adap->retries; i >= 0; i--) {
1105 ret = i2c_pxa_do_xfer(i2c, msgs, num);
1106 if (ret != I2C_RETRY)
1107 goto out;
1108
1109 if (i2c_debug)
1110 dev_dbg(&adap->dev, "Retrying transmission\n");
1111 udelay(100);
1112 }
1113 i2c_pxa_scream_blue_murder(i2c, "exhausted retries");
1114 ret = -EREMOTEIO;
1115 out:
1116 i2c_pxa_set_slave(i2c, ret);
1117 return ret;
1118 }
1119
1120 static u32 i2c_pxa_functionality(struct i2c_adapter *adap)
1121 {
1122 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
1123 I2C_FUNC_PROTOCOL_MANGLING | I2C_FUNC_NOSTART;
1124 }
1125
1126 static const struct i2c_algorithm i2c_pxa_algorithm = {
1127 .master_xfer = i2c_pxa_xfer,
1128 .functionality = i2c_pxa_functionality,
1129 };
1130
1131 static const struct i2c_algorithm i2c_pxa_pio_algorithm = {
1132 .master_xfer = i2c_pxa_pio_xfer,
1133 .functionality = i2c_pxa_functionality,
1134 };
1135
1136 static const struct of_device_id i2c_pxa_dt_ids[] = {
1137 { .compatible = "mrvl,pxa-i2c", .data = (void *)REGS_PXA2XX },
1138 { .compatible = "mrvl,pwri2c", .data = (void *)REGS_PXA3XX },
1139 { .compatible = "mrvl,mmp-twsi", .data = (void *)REGS_PXA910 },
1140 {}
1141 };
1142 MODULE_DEVICE_TABLE(of, i2c_pxa_dt_ids);
1143
1144 static int i2c_pxa_probe_dt(struct platform_device *pdev, struct pxa_i2c *i2c,
1145 enum pxa_i2c_types *i2c_types)
1146 {
1147 struct device_node *np = pdev->dev.of_node;
1148 const struct of_device_id *of_id =
1149 of_match_device(i2c_pxa_dt_ids, &pdev->dev);
1150
1151 if (!of_id)
1152 return 1;
1153
1154 /* For device tree we always use the dynamic or alias-assigned ID */
1155 i2c->adap.nr = -1;
1156
1157 if (of_get_property(np, "mrvl,i2c-polling", NULL))
1158 i2c->use_pio = 1;
1159 if (of_get_property(np, "mrvl,i2c-fast-mode", NULL))
1160 i2c->fast_mode = 1;
1161
1162 *i2c_types = (enum pxa_i2c_types)(of_id->data);
1163
1164 return 0;
1165 }
1166
1167 static int i2c_pxa_probe_pdata(struct platform_device *pdev,
1168 struct pxa_i2c *i2c,
1169 enum pxa_i2c_types *i2c_types)
1170 {
1171 struct i2c_pxa_platform_data *plat = dev_get_platdata(&pdev->dev);
1172 const struct platform_device_id *id = platform_get_device_id(pdev);
1173
1174 *i2c_types = id->driver_data;
1175 if (plat) {
1176 i2c->use_pio = plat->use_pio;
1177 i2c->fast_mode = plat->fast_mode;
1178 i2c->high_mode = plat->high_mode;
1179 i2c->master_code = plat->master_code;
1180 if (!i2c->master_code)
1181 i2c->master_code = 0xe;
1182 i2c->rate = plat->rate;
1183 }
1184 return 0;
1185 }
1186
1187 static int i2c_pxa_probe(struct platform_device *dev)
1188 {
1189 struct i2c_pxa_platform_data *plat = dev_get_platdata(&dev->dev);
1190 enum pxa_i2c_types i2c_type;
1191 struct pxa_i2c *i2c;
1192 struct resource *res = NULL;
1193 int ret, irq;
1194
1195 i2c = devm_kzalloc(&dev->dev, sizeof(struct pxa_i2c), GFP_KERNEL);
1196 if (!i2c)
1197 return -ENOMEM;
1198
1199 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1200 i2c->reg_base = devm_ioremap_resource(&dev->dev, res);
1201 if (IS_ERR(i2c->reg_base))
1202 return PTR_ERR(i2c->reg_base);
1203
1204 irq = platform_get_irq(dev, 0);
1205 if (irq < 0) {
1206 dev_err(&dev->dev, "no irq resource: %d\n", irq);
1207 return irq;
1208 }
1209
1210 /* Default adapter num to device id; i2c_pxa_probe_dt can override. */
1211 i2c->adap.nr = dev->id;
1212
1213 ret = i2c_pxa_probe_dt(dev, i2c, &i2c_type);
1214 if (ret > 0)
1215 ret = i2c_pxa_probe_pdata(dev, i2c, &i2c_type);
1216 if (ret < 0)
1217 return ret;
1218
1219 i2c->adap.owner = THIS_MODULE;
1220 i2c->adap.retries = 5;
1221
1222 spin_lock_init(&i2c->lock);
1223 init_waitqueue_head(&i2c->wait);
1224
1225 strlcpy(i2c->adap.name, "pxa_i2c-i2c", sizeof(i2c->adap.name));
1226
1227 i2c->clk = devm_clk_get(&dev->dev, NULL);
1228 if (IS_ERR(i2c->clk)) {
1229 dev_err(&dev->dev, "failed to get the clk: %ld\n", PTR_ERR(i2c->clk));
1230 return PTR_ERR(i2c->clk);
1231 }
1232
1233 i2c->reg_ibmr = i2c->reg_base + pxa_reg_layout[i2c_type].ibmr;
1234 i2c->reg_idbr = i2c->reg_base + pxa_reg_layout[i2c_type].idbr;
1235 i2c->reg_icr = i2c->reg_base + pxa_reg_layout[i2c_type].icr;
1236 i2c->reg_isr = i2c->reg_base + pxa_reg_layout[i2c_type].isr;
1237 if (i2c_type != REGS_CE4100)
1238 i2c->reg_isar = i2c->reg_base + pxa_reg_layout[i2c_type].isar;
1239
1240 if (i2c_type == REGS_PXA910) {
1241 i2c->reg_ilcr = i2c->reg_base + pxa_reg_layout[i2c_type].ilcr;
1242 i2c->reg_iwcr = i2c->reg_base + pxa_reg_layout[i2c_type].iwcr;
1243 }
1244
1245 i2c->iobase = res->start;
1246 i2c->iosize = resource_size(res);
1247
1248 i2c->irq = irq;
1249
1250 i2c->slave_addr = I2C_PXA_SLAVE_ADDR;
1251 i2c->highmode_enter = false;
1252
1253 if (plat) {
1254 #ifdef CONFIG_I2C_PXA_SLAVE
1255 i2c->slave_addr = plat->slave_addr;
1256 i2c->slave = plat->slave;
1257 #endif
1258 i2c->adap.class = plat->class;
1259 }
1260
1261 if (i2c->high_mode) {
1262 if (i2c->rate) {
1263 clk_set_rate(i2c->clk, i2c->rate);
1264 pr_info("i2c: <%s> set rate to %ld\n",
1265 i2c->adap.name, clk_get_rate(i2c->clk));
1266 } else
1267 pr_warn("i2c: <%s> clock rate not set\n",
1268 i2c->adap.name);
1269 }
1270
1271 clk_prepare_enable(i2c->clk);
1272
1273 if (i2c->use_pio) {
1274 i2c->adap.algo = &i2c_pxa_pio_algorithm;
1275 } else {
1276 i2c->adap.algo = &i2c_pxa_algorithm;
1277 ret = devm_request_irq(&dev->dev, irq, i2c_pxa_handler,
1278 IRQF_SHARED | IRQF_NO_SUSPEND,
1279 dev_name(&dev->dev), i2c);
1280 if (ret) {
1281 dev_err(&dev->dev, "failed to request irq: %d\n", ret);
1282 goto ereqirq;
1283 }
1284 }
1285
1286 i2c_pxa_reset(i2c);
1287
1288 i2c->adap.algo_data = i2c;
1289 i2c->adap.dev.parent = &dev->dev;
1290 #ifdef CONFIG_OF
1291 i2c->adap.dev.of_node = dev->dev.of_node;
1292 #endif
1293
1294 ret = i2c_add_numbered_adapter(&i2c->adap);
1295 if (ret < 0) {
1296 dev_err(&dev->dev, "failed to add bus: %d\n", ret);
1297 goto ereqirq;
1298 }
1299
1300 platform_set_drvdata(dev, i2c);
1301
1302 #ifdef CONFIG_I2C_PXA_SLAVE
1303 dev_info(&i2c->adap.dev, " PXA I2C adapter, slave address %d\n",
1304 i2c->slave_addr);
1305 #else
1306 dev_info(&i2c->adap.dev, " PXA I2C adapter\n");
1307 #endif
1308 return 0;
1309
1310 ereqirq:
1311 clk_disable_unprepare(i2c->clk);
1312 return ret;
1313 }
1314
1315 static int i2c_pxa_remove(struct platform_device *dev)
1316 {
1317 struct pxa_i2c *i2c = platform_get_drvdata(dev);
1318
1319 i2c_del_adapter(&i2c->adap);
1320
1321 clk_disable_unprepare(i2c->clk);
1322
1323 return 0;
1324 }
1325
1326 #ifdef CONFIG_PM
1327 static int i2c_pxa_suspend_noirq(struct device *dev)
1328 {
1329 struct platform_device *pdev = to_platform_device(dev);
1330 struct pxa_i2c *i2c = platform_get_drvdata(pdev);
1331
1332 clk_disable(i2c->clk);
1333
1334 return 0;
1335 }
1336
1337 static int i2c_pxa_resume_noirq(struct device *dev)
1338 {
1339 struct platform_device *pdev = to_platform_device(dev);
1340 struct pxa_i2c *i2c = platform_get_drvdata(pdev);
1341
1342 clk_enable(i2c->clk);
1343 i2c_pxa_reset(i2c);
1344
1345 return 0;
1346 }
1347
1348 static const struct dev_pm_ops i2c_pxa_dev_pm_ops = {
1349 .suspend_noirq = i2c_pxa_suspend_noirq,
1350 .resume_noirq = i2c_pxa_resume_noirq,
1351 };
1352
1353 #define I2C_PXA_DEV_PM_OPS (&i2c_pxa_dev_pm_ops)
1354 #else
1355 #define I2C_PXA_DEV_PM_OPS NULL
1356 #endif
1357
1358 static struct platform_driver i2c_pxa_driver = {
1359 .probe = i2c_pxa_probe,
1360 .remove = i2c_pxa_remove,
1361 .driver = {
1362 .name = "pxa2xx-i2c",
1363 .pm = I2C_PXA_DEV_PM_OPS,
1364 .of_match_table = i2c_pxa_dt_ids,
1365 },
1366 .id_table = i2c_pxa_id_table,
1367 };
1368
1369 static int __init i2c_adap_pxa_init(void)
1370 {
1371 return platform_driver_register(&i2c_pxa_driver);
1372 }
1373
1374 static void __exit i2c_adap_pxa_exit(void)
1375 {
1376 platform_driver_unregister(&i2c_pxa_driver);
1377 }
1378
1379 MODULE_LICENSE("GPL");
1380 MODULE_ALIAS("platform:pxa2xx-i2c");
1381
1382 subsys_initcall(i2c_adap_pxa_init);
1383 module_exit(i2c_adap_pxa_exit);
Ubuntu Artful kernel mirror