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