1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * This is i.MX low power i2c controller driver.
4 *
5 * Copyright 2016 Freescale Semiconductor, Inc.
6 */
7
8 #include <linux/clk.h>
9 #include <linux/completion.h>
10 #include <linux/delay.h>
11 #include <linux/err.h>
12 #include <linux/errno.h>
13 #include <linux/i2c.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/io.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/of.h>
20 #include <linux/of_device.h>
21 #include <linux/pinctrl/consumer.h>
22 #include <linux/platform_device.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/sched.h>
25 #include <linux/slab.h>
26
27 #define DRIVER_NAME "imx-lpi2c"
28
29 #define LPI2C_PARAM 0x04 /* i2c RX/TX FIFO size */
30 #define LPI2C_MCR 0x10 /* i2c contrl register */
31 #define LPI2C_MSR 0x14 /* i2c status register */
32 #define LPI2C_MIER 0x18 /* i2c interrupt enable */
33 #define LPI2C_MCFGR0 0x20 /* i2c master configuration */
34 #define LPI2C_MCFGR1 0x24 /* i2c master configuration */
35 #define LPI2C_MCFGR2 0x28 /* i2c master configuration */
36 #define LPI2C_MCFGR3 0x2C /* i2c master configuration */
37 #define LPI2C_MCCR0 0x48 /* i2c master clk configuration */
38 #define LPI2C_MCCR1 0x50 /* i2c master clk configuration */
39 #define LPI2C_MFCR 0x58 /* i2c master FIFO control */
40 #define LPI2C_MFSR 0x5C /* i2c master FIFO status */
41 #define LPI2C_MTDR 0x60 /* i2c master TX data register */
42 #define LPI2C_MRDR 0x70 /* i2c master RX data register */
43
44 /* i2c command */
45 #define TRAN_DATA 0X00
46 #define RECV_DATA 0X01
47 #define GEN_STOP 0X02
48 #define RECV_DISCARD 0X03
49 #define GEN_START 0X04
50 #define START_NACK 0X05
51 #define START_HIGH 0X06
52 #define START_HIGH_NACK 0X07
53
54 #define MCR_MEN BIT(0)
55 #define MCR_RST BIT(1)
56 #define MCR_DOZEN BIT(2)
57 #define MCR_DBGEN BIT(3)
58 #define MCR_RTF BIT(8)
59 #define MCR_RRF BIT(9)
60 #define MSR_TDF BIT(0)
61 #define MSR_RDF BIT(1)
62 #define MSR_SDF BIT(9)
63 #define MSR_NDF BIT(10)
64 #define MSR_ALF BIT(11)
65 #define MSR_MBF BIT(24)
66 #define MSR_BBF BIT(25)
67 #define MIER_TDIE BIT(0)
68 #define MIER_RDIE BIT(1)
69 #define MIER_SDIE BIT(9)
70 #define MIER_NDIE BIT(10)
71 #define MCFGR1_AUTOSTOP BIT(8)
72 #define MCFGR1_IGNACK BIT(9)
73 #define MRDR_RXEMPTY BIT(14)
74
75 #define I2C_CLK_RATIO 2
76 #define CHUNK_DATA 256
77
78 #define I2C_PM_TIMEOUT 10 /* ms */
79
80 enum lpi2c_imx_mode {
81 STANDARD, /* 100+Kbps */
82 FAST, /* 400+Kbps */
83 FAST_PLUS, /* 1.0+Mbps */
84 HS, /* 3.4+Mbps */
85 ULTRA_FAST, /* 5.0+Mbps */
86 };
87
88 enum lpi2c_imx_pincfg {
89 TWO_PIN_OD,
90 TWO_PIN_OO,
91 TWO_PIN_PP,
92 FOUR_PIN_PP,
93 };
94
95 struct lpi2c_imx_struct {
96 struct i2c_adapter adapter;
97 int num_clks;
98 struct clk_bulk_data *clks;
99 void __iomem *base;
100 __u8 *rx_buf;
101 __u8 *tx_buf;
102 struct completion complete;
103 unsigned int msglen;
104 unsigned int delivered;
105 unsigned int block_data;
106 unsigned int bitrate;
107 unsigned int txfifosize;
108 unsigned int rxfifosize;
109 enum lpi2c_imx_mode mode;
110 };
111
lpi2c_imx_intctrl(struct lpi2c_imx_struct * lpi2c_imx,unsigned int enable)112 static void lpi2c_imx_intctrl(struct lpi2c_imx_struct *lpi2c_imx,
113 unsigned int enable)
114 {
115 writel(enable, lpi2c_imx->base + LPI2C_MIER);
116 }
117
lpi2c_imx_bus_busy(struct lpi2c_imx_struct * lpi2c_imx)118 static int lpi2c_imx_bus_busy(struct lpi2c_imx_struct *lpi2c_imx)
119 {
120 unsigned long orig_jiffies = jiffies;
121 unsigned int temp;
122
123 while (1) {
124 temp = readl(lpi2c_imx->base + LPI2C_MSR);
125
126 /* check for arbitration lost, clear if set */
127 if (temp & MSR_ALF) {
128 writel(temp, lpi2c_imx->base + LPI2C_MSR);
129 return -EAGAIN;
130 }
131
132 if (temp & (MSR_BBF | MSR_MBF))
133 break;
134
135 if (time_after(jiffies, orig_jiffies + msecs_to_jiffies(500))) {
136 dev_dbg(&lpi2c_imx->adapter.dev, "bus not work\n");
137 return -ETIMEDOUT;
138 }
139 schedule();
140 }
141
142 return 0;
143 }
144
lpi2c_imx_set_mode(struct lpi2c_imx_struct * lpi2c_imx)145 static void lpi2c_imx_set_mode(struct lpi2c_imx_struct *lpi2c_imx)
146 {
147 unsigned int bitrate = lpi2c_imx->bitrate;
148 enum lpi2c_imx_mode mode;
149
150 if (bitrate < I2C_MAX_FAST_MODE_FREQ)
151 mode = STANDARD;
152 else if (bitrate < I2C_MAX_FAST_MODE_PLUS_FREQ)
153 mode = FAST;
154 else if (bitrate < I2C_MAX_HIGH_SPEED_MODE_FREQ)
155 mode = FAST_PLUS;
156 else if (bitrate < I2C_MAX_ULTRA_FAST_MODE_FREQ)
157 mode = HS;
158 else
159 mode = ULTRA_FAST;
160
161 lpi2c_imx->mode = mode;
162 }
163
lpi2c_imx_start(struct lpi2c_imx_struct * lpi2c_imx,struct i2c_msg * msgs)164 static int lpi2c_imx_start(struct lpi2c_imx_struct *lpi2c_imx,
165 struct i2c_msg *msgs)
166 {
167 unsigned int temp;
168
169 temp = readl(lpi2c_imx->base + LPI2C_MCR);
170 temp |= MCR_RRF | MCR_RTF;
171 writel(temp, lpi2c_imx->base + LPI2C_MCR);
172 writel(0x7f00, lpi2c_imx->base + LPI2C_MSR);
173
174 temp = i2c_8bit_addr_from_msg(msgs) | (GEN_START << 8);
175 writel(temp, lpi2c_imx->base + LPI2C_MTDR);
176
177 return lpi2c_imx_bus_busy(lpi2c_imx);
178 }
179
lpi2c_imx_stop(struct lpi2c_imx_struct * lpi2c_imx)180 static void lpi2c_imx_stop(struct lpi2c_imx_struct *lpi2c_imx)
181 {
182 unsigned long orig_jiffies = jiffies;
183 unsigned int temp;
184
185 writel(GEN_STOP << 8, lpi2c_imx->base + LPI2C_MTDR);
186
187 do {
188 temp = readl(lpi2c_imx->base + LPI2C_MSR);
189 if (temp & MSR_SDF)
190 break;
191
192 if (time_after(jiffies, orig_jiffies + msecs_to_jiffies(500))) {
193 dev_dbg(&lpi2c_imx->adapter.dev, "stop timeout\n");
194 break;
195 }
196 schedule();
197
198 } while (1);
199 }
200
201 /* CLKLO = I2C_CLK_RATIO * CLKHI, SETHOLD = CLKHI, DATAVD = CLKHI/2 */
lpi2c_imx_config(struct lpi2c_imx_struct * lpi2c_imx)202 static int lpi2c_imx_config(struct lpi2c_imx_struct *lpi2c_imx)
203 {
204 u8 prescale, filt, sethold, clkhi, clklo, datavd;
205 unsigned int clk_rate, clk_cycle;
206 enum lpi2c_imx_pincfg pincfg;
207 unsigned int temp;
208
209 lpi2c_imx_set_mode(lpi2c_imx);
210
211 clk_rate = clk_get_rate(lpi2c_imx->clks[0].clk);
212 if (lpi2c_imx->mode == HS || lpi2c_imx->mode == ULTRA_FAST)
213 filt = 0;
214 else
215 filt = 2;
216
217 for (prescale = 0; prescale <= 7; prescale++) {
218 clk_cycle = clk_rate / ((1 << prescale) * lpi2c_imx->bitrate)
219 - 3 - (filt >> 1);
220 clkhi = (clk_cycle + I2C_CLK_RATIO) / (I2C_CLK_RATIO + 1);
221 clklo = clk_cycle - clkhi;
222 if (clklo < 64)
223 break;
224 }
225
226 if (prescale > 7)
227 return -EINVAL;
228
229 /* set MCFGR1: PINCFG, PRESCALE, IGNACK */
230 if (lpi2c_imx->mode == ULTRA_FAST)
231 pincfg = TWO_PIN_OO;
232 else
233 pincfg = TWO_PIN_OD;
234 temp = prescale | pincfg << 24;
235
236 if (lpi2c_imx->mode == ULTRA_FAST)
237 temp |= MCFGR1_IGNACK;
238
239 writel(temp, lpi2c_imx->base + LPI2C_MCFGR1);
240
241 /* set MCFGR2: FILTSDA, FILTSCL */
242 temp = (filt << 16) | (filt << 24);
243 writel(temp, lpi2c_imx->base + LPI2C_MCFGR2);
244
245 /* set MCCR: DATAVD, SETHOLD, CLKHI, CLKLO */
246 sethold = clkhi;
247 datavd = clkhi >> 1;
248 temp = datavd << 24 | sethold << 16 | clkhi << 8 | clklo;
249
250 if (lpi2c_imx->mode == HS)
251 writel(temp, lpi2c_imx->base + LPI2C_MCCR1);
252 else
253 writel(temp, lpi2c_imx->base + LPI2C_MCCR0);
254
255 return 0;
256 }
257
lpi2c_imx_master_enable(struct lpi2c_imx_struct * lpi2c_imx)258 static int lpi2c_imx_master_enable(struct lpi2c_imx_struct *lpi2c_imx)
259 {
260 unsigned int temp;
261 int ret;
262
263 ret = pm_runtime_resume_and_get(lpi2c_imx->adapter.dev.parent);
264 if (ret < 0)
265 return ret;
266
267 temp = MCR_RST;
268 writel(temp, lpi2c_imx->base + LPI2C_MCR);
269 writel(0, lpi2c_imx->base + LPI2C_MCR);
270
271 ret = lpi2c_imx_config(lpi2c_imx);
272 if (ret)
273 goto rpm_put;
274
275 temp = readl(lpi2c_imx->base + LPI2C_MCR);
276 temp |= MCR_MEN;
277 writel(temp, lpi2c_imx->base + LPI2C_MCR);
278
279 return 0;
280
281 rpm_put:
282 pm_runtime_mark_last_busy(lpi2c_imx->adapter.dev.parent);
283 pm_runtime_put_autosuspend(lpi2c_imx->adapter.dev.parent);
284
285 return ret;
286 }
287
lpi2c_imx_master_disable(struct lpi2c_imx_struct * lpi2c_imx)288 static int lpi2c_imx_master_disable(struct lpi2c_imx_struct *lpi2c_imx)
289 {
290 u32 temp;
291
292 temp = readl(lpi2c_imx->base + LPI2C_MCR);
293 temp &= ~MCR_MEN;
294 writel(temp, lpi2c_imx->base + LPI2C_MCR);
295
296 pm_runtime_mark_last_busy(lpi2c_imx->adapter.dev.parent);
297 pm_runtime_put_autosuspend(lpi2c_imx->adapter.dev.parent);
298
299 return 0;
300 }
301
lpi2c_imx_msg_complete(struct lpi2c_imx_struct * lpi2c_imx)302 static int lpi2c_imx_msg_complete(struct lpi2c_imx_struct *lpi2c_imx)
303 {
304 unsigned long timeout;
305
306 timeout = wait_for_completion_timeout(&lpi2c_imx->complete, HZ);
307
308 return timeout ? 0 : -ETIMEDOUT;
309 }
310
lpi2c_imx_txfifo_empty(struct lpi2c_imx_struct * lpi2c_imx)311 static int lpi2c_imx_txfifo_empty(struct lpi2c_imx_struct *lpi2c_imx)
312 {
313 unsigned long orig_jiffies = jiffies;
314 u32 txcnt;
315
316 do {
317 txcnt = readl(lpi2c_imx->base + LPI2C_MFSR) & 0xff;
318
319 if (readl(lpi2c_imx->base + LPI2C_MSR) & MSR_NDF) {
320 dev_dbg(&lpi2c_imx->adapter.dev, "NDF detected\n");
321 return -EIO;
322 }
323
324 if (time_after(jiffies, orig_jiffies + msecs_to_jiffies(500))) {
325 dev_dbg(&lpi2c_imx->adapter.dev, "txfifo empty timeout\n");
326 return -ETIMEDOUT;
327 }
328 schedule();
329
330 } while (txcnt);
331
332 return 0;
333 }
334
lpi2c_imx_set_tx_watermark(struct lpi2c_imx_struct * lpi2c_imx)335 static void lpi2c_imx_set_tx_watermark(struct lpi2c_imx_struct *lpi2c_imx)
336 {
337 writel(lpi2c_imx->txfifosize >> 1, lpi2c_imx->base + LPI2C_MFCR);
338 }
339
lpi2c_imx_set_rx_watermark(struct lpi2c_imx_struct * lpi2c_imx)340 static void lpi2c_imx_set_rx_watermark(struct lpi2c_imx_struct *lpi2c_imx)
341 {
342 unsigned int temp, remaining;
343
344 remaining = lpi2c_imx->msglen - lpi2c_imx->delivered;
345
346 if (remaining > (lpi2c_imx->rxfifosize >> 1))
347 temp = lpi2c_imx->rxfifosize >> 1;
348 else
349 temp = 0;
350
351 writel(temp << 16, lpi2c_imx->base + LPI2C_MFCR);
352 }
353
lpi2c_imx_write_txfifo(struct lpi2c_imx_struct * lpi2c_imx)354 static void lpi2c_imx_write_txfifo(struct lpi2c_imx_struct *lpi2c_imx)
355 {
356 unsigned int data, txcnt;
357
358 txcnt = readl(lpi2c_imx->base + LPI2C_MFSR) & 0xff;
359
360 while (txcnt < lpi2c_imx->txfifosize) {
361 if (lpi2c_imx->delivered == lpi2c_imx->msglen)
362 break;
363
364 data = lpi2c_imx->tx_buf[lpi2c_imx->delivered++];
365 writel(data, lpi2c_imx->base + LPI2C_MTDR);
366 txcnt++;
367 }
368
369 if (lpi2c_imx->delivered < lpi2c_imx->msglen)
370 lpi2c_imx_intctrl(lpi2c_imx, MIER_TDIE | MIER_NDIE);
371 else
372 complete(&lpi2c_imx->complete);
373 }
374
lpi2c_imx_read_rxfifo(struct lpi2c_imx_struct * lpi2c_imx)375 static void lpi2c_imx_read_rxfifo(struct lpi2c_imx_struct *lpi2c_imx)
376 {
377 unsigned int blocklen, remaining;
378 unsigned int temp, data;
379
380 do {
381 data = readl(lpi2c_imx->base + LPI2C_MRDR);
382 if (data & MRDR_RXEMPTY)
383 break;
384
385 lpi2c_imx->rx_buf[lpi2c_imx->delivered++] = data & 0xff;
386 } while (1);
387
388 /*
389 * First byte is the length of remaining packet in the SMBus block
390 * data read. Add it to msgs->len.
391 */
392 if (lpi2c_imx->block_data) {
393 blocklen = lpi2c_imx->rx_buf[0];
394 lpi2c_imx->msglen += blocklen;
395 }
396
397 remaining = lpi2c_imx->msglen - lpi2c_imx->delivered;
398
399 if (!remaining) {
400 complete(&lpi2c_imx->complete);
401 return;
402 }
403
404 /* not finished, still waiting for rx data */
405 lpi2c_imx_set_rx_watermark(lpi2c_imx);
406
407 /* multiple receive commands */
408 if (lpi2c_imx->block_data) {
409 lpi2c_imx->block_data = 0;
410 temp = remaining;
411 temp |= (RECV_DATA << 8);
412 writel(temp, lpi2c_imx->base + LPI2C_MTDR);
413 } else if (!(lpi2c_imx->delivered & 0xff)) {
414 temp = (remaining > CHUNK_DATA ? CHUNK_DATA : remaining) - 1;
415 temp |= (RECV_DATA << 8);
416 writel(temp, lpi2c_imx->base + LPI2C_MTDR);
417 }
418
419 lpi2c_imx_intctrl(lpi2c_imx, MIER_RDIE);
420 }
421
lpi2c_imx_write(struct lpi2c_imx_struct * lpi2c_imx,struct i2c_msg * msgs)422 static void lpi2c_imx_write(struct lpi2c_imx_struct *lpi2c_imx,
423 struct i2c_msg *msgs)
424 {
425 lpi2c_imx->tx_buf = msgs->buf;
426 lpi2c_imx_set_tx_watermark(lpi2c_imx);
427 lpi2c_imx_write_txfifo(lpi2c_imx);
428 }
429
lpi2c_imx_read(struct lpi2c_imx_struct * lpi2c_imx,struct i2c_msg * msgs)430 static void lpi2c_imx_read(struct lpi2c_imx_struct *lpi2c_imx,
431 struct i2c_msg *msgs)
432 {
433 unsigned int temp;
434
435 lpi2c_imx->rx_buf = msgs->buf;
436 lpi2c_imx->block_data = msgs->flags & I2C_M_RECV_LEN;
437
438 lpi2c_imx_set_rx_watermark(lpi2c_imx);
439 temp = msgs->len > CHUNK_DATA ? CHUNK_DATA - 1 : msgs->len - 1;
440 temp |= (RECV_DATA << 8);
441 writel(temp, lpi2c_imx->base + LPI2C_MTDR);
442
443 lpi2c_imx_intctrl(lpi2c_imx, MIER_RDIE | MIER_NDIE);
444 }
445
lpi2c_imx_xfer(struct i2c_adapter * adapter,struct i2c_msg * msgs,int num)446 static int lpi2c_imx_xfer(struct i2c_adapter *adapter,
447 struct i2c_msg *msgs, int num)
448 {
449 struct lpi2c_imx_struct *lpi2c_imx = i2c_get_adapdata(adapter);
450 unsigned int temp;
451 int i, result;
452
453 result = lpi2c_imx_master_enable(lpi2c_imx);
454 if (result)
455 return result;
456
457 for (i = 0; i < num; i++) {
458 result = lpi2c_imx_start(lpi2c_imx, &msgs[i]);
459 if (result)
460 goto disable;
461
462 /* quick smbus */
463 if (num == 1 && msgs[0].len == 0)
464 goto stop;
465
466 lpi2c_imx->delivered = 0;
467 lpi2c_imx->msglen = msgs[i].len;
468 init_completion(&lpi2c_imx->complete);
469
470 if (msgs[i].flags & I2C_M_RD)
471 lpi2c_imx_read(lpi2c_imx, &msgs[i]);
472 else
473 lpi2c_imx_write(lpi2c_imx, &msgs[i]);
474
475 result = lpi2c_imx_msg_complete(lpi2c_imx);
476 if (result)
477 goto stop;
478
479 if (!(msgs[i].flags & I2C_M_RD)) {
480 result = lpi2c_imx_txfifo_empty(lpi2c_imx);
481 if (result)
482 goto stop;
483 }
484 }
485
486 stop:
487 lpi2c_imx_stop(lpi2c_imx);
488
489 temp = readl(lpi2c_imx->base + LPI2C_MSR);
490 if ((temp & MSR_NDF) && !result)
491 result = -EIO;
492
493 disable:
494 lpi2c_imx_master_disable(lpi2c_imx);
495
496 dev_dbg(&lpi2c_imx->adapter.dev, "<%s> exit with: %s: %d\n", __func__,
497 (result < 0) ? "error" : "success msg",
498 (result < 0) ? result : num);
499
500 return (result < 0) ? result : num;
501 }
502
lpi2c_imx_isr(int irq,void * dev_id)503 static irqreturn_t lpi2c_imx_isr(int irq, void *dev_id)
504 {
505 struct lpi2c_imx_struct *lpi2c_imx = dev_id;
506 unsigned int temp;
507
508 lpi2c_imx_intctrl(lpi2c_imx, 0);
509 temp = readl(lpi2c_imx->base + LPI2C_MSR);
510
511 if (temp & MSR_RDF)
512 lpi2c_imx_read_rxfifo(lpi2c_imx);
513
514 if (temp & MSR_TDF)
515 lpi2c_imx_write_txfifo(lpi2c_imx);
516
517 if (temp & MSR_NDF)
518 complete(&lpi2c_imx->complete);
519
520 return IRQ_HANDLED;
521 }
522
lpi2c_imx_func(struct i2c_adapter * adapter)523 static u32 lpi2c_imx_func(struct i2c_adapter *adapter)
524 {
525 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
526 I2C_FUNC_SMBUS_READ_BLOCK_DATA;
527 }
528
529 static const struct i2c_algorithm lpi2c_imx_algo = {
530 .master_xfer = lpi2c_imx_xfer,
531 .functionality = lpi2c_imx_func,
532 };
533
534 static const struct of_device_id lpi2c_imx_of_match[] = {
535 { .compatible = "fsl,imx7ulp-lpi2c" },
536 { },
537 };
538 MODULE_DEVICE_TABLE(of, lpi2c_imx_of_match);
539
lpi2c_imx_probe(struct platform_device * pdev)540 static int lpi2c_imx_probe(struct platform_device *pdev)
541 {
542 struct lpi2c_imx_struct *lpi2c_imx;
543 unsigned int temp;
544 int irq, ret;
545
546 lpi2c_imx = devm_kzalloc(&pdev->dev, sizeof(*lpi2c_imx), GFP_KERNEL);
547 if (!lpi2c_imx)
548 return -ENOMEM;
549
550 lpi2c_imx->base = devm_platform_ioremap_resource(pdev, 0);
551 if (IS_ERR(lpi2c_imx->base))
552 return PTR_ERR(lpi2c_imx->base);
553
554 irq = platform_get_irq(pdev, 0);
555 if (irq < 0)
556 return irq;
557
558 lpi2c_imx->adapter.owner = THIS_MODULE;
559 lpi2c_imx->adapter.algo = &lpi2c_imx_algo;
560 lpi2c_imx->adapter.dev.parent = &pdev->dev;
561 lpi2c_imx->adapter.dev.of_node = pdev->dev.of_node;
562 strscpy(lpi2c_imx->adapter.name, pdev->name,
563 sizeof(lpi2c_imx->adapter.name));
564
565 ret = devm_clk_bulk_get_all(&pdev->dev, &lpi2c_imx->clks);
566 if (ret < 0) {
567 dev_err(&pdev->dev, "can't get I2C peripheral clock, ret=%d\n", ret);
568 return ret;
569 }
570 lpi2c_imx->num_clks = ret;
571
572 ret = of_property_read_u32(pdev->dev.of_node,
573 "clock-frequency", &lpi2c_imx->bitrate);
574 if (ret)
575 lpi2c_imx->bitrate = I2C_MAX_STANDARD_MODE_FREQ;
576
577 ret = devm_request_irq(&pdev->dev, irq, lpi2c_imx_isr, 0,
578 pdev->name, lpi2c_imx);
579 if (ret) {
580 dev_err(&pdev->dev, "can't claim irq %d\n", irq);
581 return ret;
582 }
583
584 i2c_set_adapdata(&lpi2c_imx->adapter, lpi2c_imx);
585 platform_set_drvdata(pdev, lpi2c_imx);
586
587 ret = clk_bulk_prepare_enable(lpi2c_imx->num_clks, lpi2c_imx->clks);
588 if (ret)
589 return ret;
590
591 pm_runtime_set_autosuspend_delay(&pdev->dev, I2C_PM_TIMEOUT);
592 pm_runtime_use_autosuspend(&pdev->dev);
593 pm_runtime_get_noresume(&pdev->dev);
594 pm_runtime_set_active(&pdev->dev);
595 pm_runtime_enable(&pdev->dev);
596
597 temp = readl(lpi2c_imx->base + LPI2C_PARAM);
598 lpi2c_imx->txfifosize = 1 << (temp & 0x0f);
599 lpi2c_imx->rxfifosize = 1 << ((temp >> 8) & 0x0f);
600
601 ret = i2c_add_adapter(&lpi2c_imx->adapter);
602 if (ret)
603 goto rpm_disable;
604
605 pm_runtime_mark_last_busy(&pdev->dev);
606 pm_runtime_put_autosuspend(&pdev->dev);
607
608 dev_info(&lpi2c_imx->adapter.dev, "LPI2C adapter registered\n");
609
610 return 0;
611
612 rpm_disable:
613 pm_runtime_put(&pdev->dev);
614 pm_runtime_disable(&pdev->dev);
615 pm_runtime_dont_use_autosuspend(&pdev->dev);
616
617 return ret;
618 }
619
lpi2c_imx_remove(struct platform_device * pdev)620 static int lpi2c_imx_remove(struct platform_device *pdev)
621 {
622 struct lpi2c_imx_struct *lpi2c_imx = platform_get_drvdata(pdev);
623
624 i2c_del_adapter(&lpi2c_imx->adapter);
625
626 pm_runtime_disable(&pdev->dev);
627 pm_runtime_dont_use_autosuspend(&pdev->dev);
628
629 return 0;
630 }
631
lpi2c_runtime_suspend(struct device * dev)632 static int __maybe_unused lpi2c_runtime_suspend(struct device *dev)
633 {
634 struct lpi2c_imx_struct *lpi2c_imx = dev_get_drvdata(dev);
635
636 clk_bulk_disable_unprepare(lpi2c_imx->num_clks, lpi2c_imx->clks);
637 pinctrl_pm_select_sleep_state(dev);
638
639 return 0;
640 }
641
lpi2c_runtime_resume(struct device * dev)642 static int __maybe_unused lpi2c_runtime_resume(struct device *dev)
643 {
644 struct lpi2c_imx_struct *lpi2c_imx = dev_get_drvdata(dev);
645 int ret;
646
647 pinctrl_pm_select_default_state(dev);
648 ret = clk_bulk_prepare_enable(lpi2c_imx->num_clks, lpi2c_imx->clks);
649 if (ret) {
650 dev_err(dev, "failed to enable I2C clock, ret=%d\n", ret);
651 return ret;
652 }
653
654 return 0;
655 }
656
657 static const struct dev_pm_ops lpi2c_pm_ops = {
658 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
659 pm_runtime_force_resume)
660 SET_RUNTIME_PM_OPS(lpi2c_runtime_suspend,
661 lpi2c_runtime_resume, NULL)
662 };
663
664 static struct platform_driver lpi2c_imx_driver = {
665 .probe = lpi2c_imx_probe,
666 .remove = lpi2c_imx_remove,
667 .driver = {
668 .name = DRIVER_NAME,
669 .of_match_table = lpi2c_imx_of_match,
670 .pm = &lpi2c_pm_ops,
671 },
672 };
673
674 module_platform_driver(lpi2c_imx_driver);
675
676 MODULE_AUTHOR("Gao Pan <pandy.gao@nxp.com>");
677 MODULE_DESCRIPTION("I2C adapter driver for LPI2C bus");
678 MODULE_LICENSE("GPL");
679
