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1/*
2 * Copyright (c) 2003-2015 Broadcom Corporation
3 *
4 * This file is licensed under the terms of the GNU General Public
5 * License version 2. This program is licensed "as is" without any
6 * warranty of any kind, whether express or implied.
7 */
8
9#include <linux/acpi.h>
10#include <linux/clk.h>
11#include <linux/completion.h>
12#include <linux/i2c.h>
13#include <linux/i2c-smbus.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/platform_device.h>
20#include <linux/delay.h>
21
22#define XLP9XX_I2C_DIV 0x0
23#define XLP9XX_I2C_CTRL 0x1
24#define XLP9XX_I2C_CMD 0x2
25#define XLP9XX_I2C_STATUS 0x3
26#define XLP9XX_I2C_MTXFIFO 0x4
27#define XLP9XX_I2C_MRXFIFO 0x5
28#define XLP9XX_I2C_MFIFOCTRL 0x6
29#define XLP9XX_I2C_STXFIFO 0x7
30#define XLP9XX_I2C_SRXFIFO 0x8
31#define XLP9XX_I2C_SFIFOCTRL 0x9
32#define XLP9XX_I2C_SLAVEADDR 0xA
33#define XLP9XX_I2C_OWNADDR 0xB
34#define XLP9XX_I2C_FIFOWCNT 0xC
35#define XLP9XX_I2C_INTEN 0xD
36#define XLP9XX_I2C_INTST 0xE
37#define XLP9XX_I2C_WAITCNT 0xF
38#define XLP9XX_I2C_TIMEOUT 0X10
39#define XLP9XX_I2C_GENCALLADDR 0x11
40
41#define XLP9XX_I2C_STATUS_BUSY BIT(0)
42
43#define XLP9XX_I2C_CMD_START BIT(7)
44#define XLP9XX_I2C_CMD_STOP BIT(6)
45#define XLP9XX_I2C_CMD_READ BIT(5)
46#define XLP9XX_I2C_CMD_WRITE BIT(4)
47#define XLP9XX_I2C_CMD_ACK BIT(3)
48
49#define XLP9XX_I2C_CTRL_MCTLEN_SHIFT 16
50#define XLP9XX_I2C_CTRL_MCTLEN_MASK 0xffff0000
51#define XLP9XX_I2C_CTRL_RST BIT(8)
52#define XLP9XX_I2C_CTRL_EN BIT(6)
53#define XLP9XX_I2C_CTRL_MASTER BIT(4)
54#define XLP9XX_I2C_CTRL_FIFORD BIT(1)
55#define XLP9XX_I2C_CTRL_ADDMODE BIT(0)
56
57#define XLP9XX_I2C_INTEN_NACKADDR BIT(25)
58#define XLP9XX_I2C_INTEN_SADDR BIT(13)
59#define XLP9XX_I2C_INTEN_DATADONE BIT(12)
60#define XLP9XX_I2C_INTEN_ARLOST BIT(11)
61#define XLP9XX_I2C_INTEN_MFIFOFULL BIT(4)
62#define XLP9XX_I2C_INTEN_MFIFOEMTY BIT(3)
63#define XLP9XX_I2C_INTEN_MFIFOHI BIT(2)
64#define XLP9XX_I2C_INTEN_BUSERR BIT(0)
65
66#define XLP9XX_I2C_MFIFOCTRL_HITH_SHIFT 8
67#define XLP9XX_I2C_MFIFOCTRL_LOTH_SHIFT 0
68#define XLP9XX_I2C_MFIFOCTRL_RST BIT(16)
69
70#define XLP9XX_I2C_SLAVEADDR_RW BIT(0)
71#define XLP9XX_I2C_SLAVEADDR_ADDR_SHIFT 1
72
73#define XLP9XX_I2C_IP_CLK_FREQ 133000000UL
74#define XLP9XX_I2C_FIFO_SIZE 0x80U
75#define XLP9XX_I2C_TIMEOUT_MS 1000
76#define XLP9XX_I2C_BUSY_TIMEOUT 50
77
78#define XLP9XX_I2C_FIFO_WCNT_MASK 0xff
79#define XLP9XX_I2C_STATUS_ERRMASK (XLP9XX_I2C_INTEN_ARLOST | \
80 XLP9XX_I2C_INTEN_NACKADDR | XLP9XX_I2C_INTEN_BUSERR)
81
82struct xlp9xx_i2c_dev {
83 struct device *dev;
84 struct i2c_adapter adapter;
85 struct completion msg_complete;
86 struct i2c_smbus_alert_setup alert_data;
87 struct i2c_client *ara;
88 int irq;
89 bool msg_read;
90 bool len_recv;
91 bool client_pec;
92 u32 __iomem *base;
93 u32 msg_buf_remaining;
94 u32 msg_len;
95 u32 ip_clk_hz;
96 u32 clk_hz;
97 u32 msg_err;
98 u8 *msg_buf;
99};
100
101static inline void xlp9xx_write_i2c_reg(struct xlp9xx_i2c_dev *priv,
102 unsigned long reg, u32 val)
103{
104 writel(val, priv->base + reg);
105}
106
107static inline u32 xlp9xx_read_i2c_reg(struct xlp9xx_i2c_dev *priv,
108 unsigned long reg)
109{
110 return readl(priv->base + reg);
111}
112
113static void xlp9xx_i2c_mask_irq(struct xlp9xx_i2c_dev *priv, u32 mask)
114{
115 u32 inten;
116
117 inten = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_INTEN) & ~mask;
118 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, inten);
119}
120
121static void xlp9xx_i2c_unmask_irq(struct xlp9xx_i2c_dev *priv, u32 mask)
122{
123 u32 inten;
124
125 inten = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_INTEN) | mask;
126 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, inten);
127}
128
129static void xlp9xx_i2c_update_rx_fifo_thres(struct xlp9xx_i2c_dev *priv)
130{
131 u32 thres;
132
133 if (priv->len_recv)
134 /* interrupt after the first read to examine
135 * the length byte before proceeding further
136 */
137 thres = 1;
138 else if (priv->msg_buf_remaining > XLP9XX_I2C_FIFO_SIZE)
139 thres = XLP9XX_I2C_FIFO_SIZE;
140 else
141 thres = priv->msg_buf_remaining;
142
143 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_MFIFOCTRL,
144 thres << XLP9XX_I2C_MFIFOCTRL_HITH_SHIFT);
145}
146
147static void xlp9xx_i2c_fill_tx_fifo(struct xlp9xx_i2c_dev *priv)
148{
149 u32 len, i;
150 u8 *buf = priv->msg_buf;
151
152 len = min(priv->msg_buf_remaining, XLP9XX_I2C_FIFO_SIZE);
153 for (i = 0; i < len; i++)
154 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_MTXFIFO, buf[i]);
155 priv->msg_buf_remaining -= len;
156 priv->msg_buf += len;
157}
158
159static void xlp9xx_i2c_update_rlen(struct xlp9xx_i2c_dev *priv)
160{
161 u32 val, len;
162
163 /*
164 * Update receive length. Re-read len to get the latest value,
165 * and then add 4 to have a minimum value that can be safely
166 * written. This is to account for the byte read above, the
167 * transfer in progress and any delays in the register I/O
168 */
169 val = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_CTRL);
170 len = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_FIFOWCNT) &
171 XLP9XX_I2C_FIFO_WCNT_MASK;
172 len = max_t(u32, priv->msg_len, len + 4);
173 if (len >= I2C_SMBUS_BLOCK_MAX + 2)
174 return;
175 val = (val & ~XLP9XX_I2C_CTRL_MCTLEN_MASK) |
176 (len << XLP9XX_I2C_CTRL_MCTLEN_SHIFT);
177 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, val);
178}
179
180static void xlp9xx_i2c_drain_rx_fifo(struct xlp9xx_i2c_dev *priv)
181{
182 u32 len, i;
183 u8 rlen, *buf = priv->msg_buf;
184
185 len = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_FIFOWCNT) &
186 XLP9XX_I2C_FIFO_WCNT_MASK;
187 if (!len)
188 return;
189 if (priv->len_recv) {
190 /* read length byte */
191 rlen = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_MRXFIFO);
192
193 /*
194 * We expect at least 2 interrupts for I2C_M_RECV_LEN
195 * transactions. The length is updated during the first
196 * interrupt, and the buffer contents are only copied
197 * during subsequent interrupts. If in case the interrupts
198 * get merged we would complete the transaction without
199 * copying out the bytes from RX fifo. To avoid this now we
200 * drain the fifo as and when data is available.
201 * We drained the rlen byte already, decrement total length
202 * by one.
203 */
204
205 len--;
206 if (rlen > I2C_SMBUS_BLOCK_MAX || rlen == 0) {
207 rlen = 0; /*abort transfer */
208 priv->msg_buf_remaining = 0;
209 priv->msg_len = 0;
210 xlp9xx_i2c_update_rlen(priv);
211 return;
212 }
213
214 *buf++ = rlen;
215 if (priv->client_pec)
216 ++rlen; /* account for error check byte */
217 /* update remaining bytes and message length */
218 priv->msg_buf_remaining = rlen;
219 priv->msg_len = rlen + 1;
220 xlp9xx_i2c_update_rlen(priv);
221 priv->len_recv = false;
222 }
223
224 len = min(priv->msg_buf_remaining, len);
225 for (i = 0; i < len; i++, buf++)
226 *buf = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_MRXFIFO);
227
228 priv->msg_buf_remaining -= len;
229 priv->msg_buf = buf;
230
231 if (priv->msg_buf_remaining)
232 xlp9xx_i2c_update_rx_fifo_thres(priv);
233}
234
235static irqreturn_t xlp9xx_i2c_isr(int irq, void *dev_id)
236{
237 struct xlp9xx_i2c_dev *priv = dev_id;
238 u32 status;
239
240 status = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_INTST);
241 if (status == 0)
242 return IRQ_NONE;
243
244 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTST, status);
245 if (status & XLP9XX_I2C_STATUS_ERRMASK) {
246 priv->msg_err = status;
247 goto xfer_done;
248 }
249
250 /* SADDR ACK for SMBUS_QUICK */
251 if ((status & XLP9XX_I2C_INTEN_SADDR) && (priv->msg_len == 0))
252 goto xfer_done;
253
254 if (!priv->msg_read) {
255 if (status & XLP9XX_I2C_INTEN_MFIFOEMTY) {
256 /* TX FIFO got empty, fill it up again */
257 if (priv->msg_buf_remaining)
258 xlp9xx_i2c_fill_tx_fifo(priv);
259 else
260 xlp9xx_i2c_mask_irq(priv,
261 XLP9XX_I2C_INTEN_MFIFOEMTY);
262 }
263 } else {
264 if (status & (XLP9XX_I2C_INTEN_DATADONE |
265 XLP9XX_I2C_INTEN_MFIFOHI)) {
266 /* data is in FIFO, read it */
267 if (priv->msg_buf_remaining)
268 xlp9xx_i2c_drain_rx_fifo(priv);
269 }
270 }
271
272 /* Transfer complete */
273 if (status & XLP9XX_I2C_INTEN_DATADONE)
274 goto xfer_done;
275
276 return IRQ_HANDLED;
277
278xfer_done:
279 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, 0);
280 complete(&priv->msg_complete);
281 return IRQ_HANDLED;
282}
283
284static int xlp9xx_i2c_check_bus_status(struct xlp9xx_i2c_dev *priv)
285{
286 u32 status;
287 u32 busy_timeout = XLP9XX_I2C_BUSY_TIMEOUT;
288
289 while (busy_timeout) {
290 status = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_STATUS);
291 if ((status & XLP9XX_I2C_STATUS_BUSY) == 0)
292 break;
293
294 busy_timeout--;
295 usleep_range(1000, 1100);
296 }
297
298 if (!busy_timeout)
299 return -EIO;
300
301 return 0;
302}
303
304static int xlp9xx_i2c_init(struct xlp9xx_i2c_dev *priv)
305{
306 u32 prescale;
307
308 /*
309 * The controller uses 5 * SCL clock internally.
310 * So prescale value should be divided by 5.
311 */
312 prescale = DIV_ROUND_UP(priv->ip_clk_hz, priv->clk_hz);
313 prescale = ((prescale - 8) / 5) - 1;
314 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, XLP9XX_I2C_CTRL_RST);
315 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, XLP9XX_I2C_CTRL_EN |
316 XLP9XX_I2C_CTRL_MASTER);
317 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_DIV, prescale);
318 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, 0);
319
320 return 0;
321}
322
323static int xlp9xx_i2c_xfer_msg(struct xlp9xx_i2c_dev *priv, struct i2c_msg *msg,
324 int last_msg)
325{
326 unsigned long timeleft;
327 u32 intr_mask, cmd, val, len;
328
329 priv->msg_buf = msg->buf;
330 priv->msg_buf_remaining = priv->msg_len = msg->len;
331 priv->msg_err = 0;
332 priv->msg_read = (msg->flags & I2C_M_RD);
333 reinit_completion(&priv->msg_complete);
334
335 /* Reset FIFO */
336 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_MFIFOCTRL,
337 XLP9XX_I2C_MFIFOCTRL_RST);
338
339 /* set slave addr */
340 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_SLAVEADDR,
341 (msg->addr << XLP9XX_I2C_SLAVEADDR_ADDR_SHIFT) |
342 (priv->msg_read ? XLP9XX_I2C_SLAVEADDR_RW : 0));
343
344 /* Build control word for transfer */
345 val = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_CTRL);
346 if (!priv->msg_read)
347 val &= ~XLP9XX_I2C_CTRL_FIFORD;
348 else
349 val |= XLP9XX_I2C_CTRL_FIFORD; /* read */
350
351 if (msg->flags & I2C_M_TEN)
352 val |= XLP9XX_I2C_CTRL_ADDMODE; /* 10-bit address mode*/
353 else
354 val &= ~XLP9XX_I2C_CTRL_ADDMODE;
355
356 priv->len_recv = msg->flags & I2C_M_RECV_LEN;
357 len = priv->len_recv ? I2C_SMBUS_BLOCK_MAX + 2 : msg->len;
358 priv->client_pec = msg->flags & I2C_CLIENT_PEC;
359
360 /* set FIFO threshold if reading */
361 if (priv->msg_read)
362 xlp9xx_i2c_update_rx_fifo_thres(priv);
363
364 /* set data length to be transferred */
365 val = (val & ~XLP9XX_I2C_CTRL_MCTLEN_MASK) |
366 (len << XLP9XX_I2C_CTRL_MCTLEN_SHIFT);
367 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, val);
368
369 /* fill fifo during tx */
370 if (!priv->msg_read)
371 xlp9xx_i2c_fill_tx_fifo(priv);
372
373 /* set interrupt mask */
374 intr_mask = (XLP9XX_I2C_INTEN_ARLOST | XLP9XX_I2C_INTEN_BUSERR |
375 XLP9XX_I2C_INTEN_NACKADDR | XLP9XX_I2C_INTEN_DATADONE);
376
377 if (priv->msg_read) {
378 intr_mask |= XLP9XX_I2C_INTEN_MFIFOHI;
379 if (msg->len == 0)
380 intr_mask |= XLP9XX_I2C_INTEN_SADDR;
381 } else {
382 if (msg->len == 0)
383 intr_mask |= XLP9XX_I2C_INTEN_SADDR;
384 else
385 intr_mask |= XLP9XX_I2C_INTEN_MFIFOEMTY;
386 }
387 xlp9xx_i2c_unmask_irq(priv, intr_mask);
388
389 /* set cmd reg */
390 cmd = XLP9XX_I2C_CMD_START;
391 if (msg->len)
392 cmd |= (priv->msg_read ?
393 XLP9XX_I2C_CMD_READ : XLP9XX_I2C_CMD_WRITE);
394 if (last_msg)
395 cmd |= XLP9XX_I2C_CMD_STOP;
396
397 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CMD, cmd);
398
399 timeleft = msecs_to_jiffies(XLP9XX_I2C_TIMEOUT_MS);
400 timeleft = wait_for_completion_timeout(&priv->msg_complete, timeleft);
401
402 if (priv->msg_err & XLP9XX_I2C_INTEN_BUSERR) {
403 dev_dbg(priv->dev, "transfer error %x!\n", priv->msg_err);
404 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CMD, XLP9XX_I2C_CMD_STOP);
405 return -EIO;
406 } else if (priv->msg_err & XLP9XX_I2C_INTEN_NACKADDR) {
407 return -ENXIO;
408 }
409
410 if (timeleft == 0) {
411 dev_dbg(priv->dev, "i2c transfer timed out!\n");
412 xlp9xx_i2c_init(priv);
413 return -ETIMEDOUT;
414 }
415
416 /* update msg->len with actual received length */
417 if (msg->flags & I2C_M_RECV_LEN) {
418 if (!priv->msg_len)
419 return -EPROTO;
420 msg->len = priv->msg_len;
421 }
422 return 0;
423}
424
425static int xlp9xx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
426 int num)
427{
428 int i, ret;
429 struct xlp9xx_i2c_dev *priv = i2c_get_adapdata(adap);
430
431 ret = xlp9xx_i2c_check_bus_status(priv);
432 if (ret) {
433 xlp9xx_i2c_init(priv);
434 ret = xlp9xx_i2c_check_bus_status(priv);
435 if (ret)
436 return ret;
437 }
438
439 for (i = 0; i < num; i++) {
440 ret = xlp9xx_i2c_xfer_msg(priv, &msgs[i], i == num - 1);
441 if (ret != 0)
442 return ret;
443 }
444
445 return num;
446}
447
448static u32 xlp9xx_i2c_functionality(struct i2c_adapter *adapter)
449{
450 return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_SMBUS_READ_BLOCK_DATA |
451 I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR;
452}
453
454static const struct i2c_algorithm xlp9xx_i2c_algo = {
455 .master_xfer = xlp9xx_i2c_xfer,
456 .functionality = xlp9xx_i2c_functionality,
457};
458
459static int xlp9xx_i2c_get_frequency(struct platform_device *pdev,
460 struct xlp9xx_i2c_dev *priv)
461{
462 struct clk *clk;
463 u32 freq;
464 int err;
465
466 clk = devm_clk_get(&pdev->dev, NULL);
467 if (IS_ERR(clk)) {
468 priv->ip_clk_hz = XLP9XX_I2C_IP_CLK_FREQ;
469 dev_dbg(&pdev->dev, "using default input frequency %u\n",
470 priv->ip_clk_hz);
471 } else {
472 priv->ip_clk_hz = clk_get_rate(clk);
473 }
474
475 err = device_property_read_u32(&pdev->dev, "clock-frequency", &freq);
476 if (err) {
477 freq = I2C_MAX_STANDARD_MODE_FREQ;
478 dev_dbg(&pdev->dev, "using default frequency %u\n", freq);
479 } else if (freq == 0 || freq > I2C_MAX_FAST_MODE_FREQ) {
480 dev_warn(&pdev->dev, "invalid frequency %u, using default\n",
481 freq);
482 freq = I2C_MAX_STANDARD_MODE_FREQ;
483 }
484 priv->clk_hz = freq;
485
486 return 0;
487}
488
489static int xlp9xx_i2c_smbus_setup(struct xlp9xx_i2c_dev *priv,
490 struct platform_device *pdev)
491{
492 struct i2c_client *ara;
493
494 if (!priv->alert_data.irq)
495 return -EINVAL;
496
497 ara = i2c_new_smbus_alert_device(&priv->adapter, &priv->alert_data);
498 if (IS_ERR(ara))
499 return PTR_ERR(ara);
500
501 priv->ara = ara;
502
503 return 0;
504}
505
506static int xlp9xx_i2c_probe(struct platform_device *pdev)
507{
508 struct xlp9xx_i2c_dev *priv;
509 int err = 0;
510
511 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
512 if (!priv)
513 return -ENOMEM;
514
515 priv->base = devm_platform_ioremap_resource(pdev, 0);
516 if (IS_ERR(priv->base))
517 return PTR_ERR(priv->base);
518
519 priv->irq = platform_get_irq(pdev, 0);
520 if (priv->irq < 0)
521 return priv->irq;
522 /* SMBAlert irq */
523 priv->alert_data.irq = platform_get_irq(pdev, 1);
524 if (priv->alert_data.irq <= 0)
525 priv->alert_data.irq = 0;
526
527 xlp9xx_i2c_get_frequency(pdev, priv);
528 xlp9xx_i2c_init(priv);
529
530 err = devm_request_irq(&pdev->dev, priv->irq, xlp9xx_i2c_isr, 0,
531 pdev->name, priv);
532 if (err) {
533 dev_err(&pdev->dev, "IRQ request failed!\n");
534 return err;
535 }
536
537 init_completion(&priv->msg_complete);
538 priv->adapter.dev.parent = &pdev->dev;
539 priv->adapter.algo = &xlp9xx_i2c_algo;
540 priv->adapter.class = I2C_CLASS_HWMON;
541 ACPI_COMPANION_SET(&priv->adapter.dev, ACPI_COMPANION(&pdev->dev));
542 priv->adapter.dev.of_node = pdev->dev.of_node;
543 priv->dev = &pdev->dev;
544
545 snprintf(priv->adapter.name, sizeof(priv->adapter.name), "xlp9xx-i2c");
546 i2c_set_adapdata(&priv->adapter, priv);
547
548 err = i2c_add_adapter(&priv->adapter);
549 if (err)
550 return err;
551
552 err = xlp9xx_i2c_smbus_setup(priv, pdev);
553 if (err)
554 dev_dbg(&pdev->dev, "No active SMBus alert %d\n", err);
555
556 platform_set_drvdata(pdev, priv);
557 dev_dbg(&pdev->dev, "I2C bus:%d added\n", priv->adapter.nr);
558
559 return 0;
560}
561
562static int xlp9xx_i2c_remove(struct platform_device *pdev)
563{
564 struct xlp9xx_i2c_dev *priv;
565
566 priv = platform_get_drvdata(pdev);
567 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, 0);
568 synchronize_irq(priv->irq);
569 i2c_del_adapter(&priv->adapter);
570 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, 0);
571
572 return 0;
573}
574
575#ifdef CONFIG_ACPI
576static const struct acpi_device_id xlp9xx_i2c_acpi_ids[] = {
577 {"BRCM9007", 0},
578 {"CAV9007", 0},
579 {}
580};
581MODULE_DEVICE_TABLE(acpi, xlp9xx_i2c_acpi_ids);
582#endif
583
584static struct platform_driver xlp9xx_i2c_driver = {
585 .probe = xlp9xx_i2c_probe,
586 .remove = xlp9xx_i2c_remove,
587 .driver = {
588 .name = "xlp9xx-i2c",
589 .acpi_match_table = ACPI_PTR(xlp9xx_i2c_acpi_ids),
590 },
591};
592
593module_platform_driver(xlp9xx_i2c_driver);
594
595MODULE_AUTHOR("Subhendu Sekhar Behera <sbehera@broadcom.com>");
596MODULE_DESCRIPTION("XLP9XX/5XX I2C Bus Controller Driver");
597MODULE_LICENSE("GPL v2");
1/*
2 * Copyright (c) 2003-2015 Broadcom Corporation
3 *
4 * This file is licensed under the terms of the GNU General Public
5 * License version 2. This program is licensed "as is" without any
6 * warranty of any kind, whether express or implied.
7 */
8
9#include <linux/acpi.h>
10#include <linux/clk.h>
11#include <linux/completion.h>
12#include <linux/i2c.h>
13#include <linux/i2c-smbus.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/platform_device.h>
20#include <linux/delay.h>
21
22#define XLP9XX_I2C_DIV 0x0
23#define XLP9XX_I2C_CTRL 0x1
24#define XLP9XX_I2C_CMD 0x2
25#define XLP9XX_I2C_STATUS 0x3
26#define XLP9XX_I2C_MTXFIFO 0x4
27#define XLP9XX_I2C_MRXFIFO 0x5
28#define XLP9XX_I2C_MFIFOCTRL 0x6
29#define XLP9XX_I2C_STXFIFO 0x7
30#define XLP9XX_I2C_SRXFIFO 0x8
31#define XLP9XX_I2C_SFIFOCTRL 0x9
32#define XLP9XX_I2C_SLAVEADDR 0xA
33#define XLP9XX_I2C_OWNADDR 0xB
34#define XLP9XX_I2C_FIFOWCNT 0xC
35#define XLP9XX_I2C_INTEN 0xD
36#define XLP9XX_I2C_INTST 0xE
37#define XLP9XX_I2C_WAITCNT 0xF
38#define XLP9XX_I2C_TIMEOUT 0X10
39#define XLP9XX_I2C_GENCALLADDR 0x11
40
41#define XLP9XX_I2C_STATUS_BUSY BIT(0)
42
43#define XLP9XX_I2C_CMD_START BIT(7)
44#define XLP9XX_I2C_CMD_STOP BIT(6)
45#define XLP9XX_I2C_CMD_READ BIT(5)
46#define XLP9XX_I2C_CMD_WRITE BIT(4)
47#define XLP9XX_I2C_CMD_ACK BIT(3)
48
49#define XLP9XX_I2C_CTRL_MCTLEN_SHIFT 16
50#define XLP9XX_I2C_CTRL_MCTLEN_MASK 0xffff0000
51#define XLP9XX_I2C_CTRL_RST BIT(8)
52#define XLP9XX_I2C_CTRL_EN BIT(6)
53#define XLP9XX_I2C_CTRL_MASTER BIT(4)
54#define XLP9XX_I2C_CTRL_FIFORD BIT(1)
55#define XLP9XX_I2C_CTRL_ADDMODE BIT(0)
56
57#define XLP9XX_I2C_INTEN_NACKADDR BIT(25)
58#define XLP9XX_I2C_INTEN_SADDR BIT(13)
59#define XLP9XX_I2C_INTEN_DATADONE BIT(12)
60#define XLP9XX_I2C_INTEN_ARLOST BIT(11)
61#define XLP9XX_I2C_INTEN_MFIFOFULL BIT(4)
62#define XLP9XX_I2C_INTEN_MFIFOEMTY BIT(3)
63#define XLP9XX_I2C_INTEN_MFIFOHI BIT(2)
64#define XLP9XX_I2C_INTEN_BUSERR BIT(0)
65
66#define XLP9XX_I2C_MFIFOCTRL_HITH_SHIFT 8
67#define XLP9XX_I2C_MFIFOCTRL_LOTH_SHIFT 0
68#define XLP9XX_I2C_MFIFOCTRL_RST BIT(16)
69
70#define XLP9XX_I2C_SLAVEADDR_RW BIT(0)
71#define XLP9XX_I2C_SLAVEADDR_ADDR_SHIFT 1
72
73#define XLP9XX_I2C_IP_CLK_FREQ 133000000UL
74#define XLP9XX_I2C_FIFO_SIZE 0x80U
75#define XLP9XX_I2C_TIMEOUT_MS 1000
76#define XLP9XX_I2C_BUSY_TIMEOUT 50
77
78#define XLP9XX_I2C_FIFO_WCNT_MASK 0xff
79#define XLP9XX_I2C_STATUS_ERRMASK (XLP9XX_I2C_INTEN_ARLOST | \
80 XLP9XX_I2C_INTEN_NACKADDR | XLP9XX_I2C_INTEN_BUSERR)
81
82struct xlp9xx_i2c_dev {
83 struct device *dev;
84 struct i2c_adapter adapter;
85 struct completion msg_complete;
86 struct i2c_smbus_alert_setup alert_data;
87 struct i2c_client *ara;
88 int irq;
89 bool msg_read;
90 bool len_recv;
91 bool client_pec;
92 u32 __iomem *base;
93 u32 msg_buf_remaining;
94 u32 msg_len;
95 u32 ip_clk_hz;
96 u32 clk_hz;
97 u32 msg_err;
98 u8 *msg_buf;
99};
100
101static inline void xlp9xx_write_i2c_reg(struct xlp9xx_i2c_dev *priv,
102 unsigned long reg, u32 val)
103{
104 writel(val, priv->base + reg);
105}
106
107static inline u32 xlp9xx_read_i2c_reg(struct xlp9xx_i2c_dev *priv,
108 unsigned long reg)
109{
110 return readl(priv->base + reg);
111}
112
113static void xlp9xx_i2c_mask_irq(struct xlp9xx_i2c_dev *priv, u32 mask)
114{
115 u32 inten;
116
117 inten = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_INTEN) & ~mask;
118 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, inten);
119}
120
121static void xlp9xx_i2c_unmask_irq(struct xlp9xx_i2c_dev *priv, u32 mask)
122{
123 u32 inten;
124
125 inten = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_INTEN) | mask;
126 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, inten);
127}
128
129static void xlp9xx_i2c_update_rx_fifo_thres(struct xlp9xx_i2c_dev *priv)
130{
131 u32 thres;
132
133 if (priv->len_recv)
134 /* interrupt after the first read to examine
135 * the length byte before proceeding further
136 */
137 thres = 1;
138 else if (priv->msg_buf_remaining > XLP9XX_I2C_FIFO_SIZE)
139 thres = XLP9XX_I2C_FIFO_SIZE;
140 else
141 thres = priv->msg_buf_remaining;
142
143 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_MFIFOCTRL,
144 thres << XLP9XX_I2C_MFIFOCTRL_HITH_SHIFT);
145}
146
147static void xlp9xx_i2c_fill_tx_fifo(struct xlp9xx_i2c_dev *priv)
148{
149 u32 len, i;
150 u8 *buf = priv->msg_buf;
151
152 len = min(priv->msg_buf_remaining, XLP9XX_I2C_FIFO_SIZE);
153 for (i = 0; i < len; i++)
154 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_MTXFIFO, buf[i]);
155 priv->msg_buf_remaining -= len;
156 priv->msg_buf += len;
157}
158
159static void xlp9xx_i2c_update_rlen(struct xlp9xx_i2c_dev *priv)
160{
161 u32 val, len;
162
163 /*
164 * Update receive length. Re-read len to get the latest value,
165 * and then add 4 to have a minimum value that can be safely
166 * written. This is to account for the byte read above, the
167 * transfer in progress and any delays in the register I/O
168 */
169 val = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_CTRL);
170 len = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_FIFOWCNT) &
171 XLP9XX_I2C_FIFO_WCNT_MASK;
172 len = max_t(u32, priv->msg_len, len + 4);
173 if (len >= I2C_SMBUS_BLOCK_MAX + 2)
174 return;
175 val = (val & ~XLP9XX_I2C_CTRL_MCTLEN_MASK) |
176 (len << XLP9XX_I2C_CTRL_MCTLEN_SHIFT);
177 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, val);
178}
179
180static void xlp9xx_i2c_drain_rx_fifo(struct xlp9xx_i2c_dev *priv)
181{
182 u32 len, i;
183 u8 rlen, *buf = priv->msg_buf;
184
185 len = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_FIFOWCNT) &
186 XLP9XX_I2C_FIFO_WCNT_MASK;
187 if (!len)
188 return;
189 if (priv->len_recv) {
190 /* read length byte */
191 rlen = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_MRXFIFO);
192
193 /*
194 * We expect at least 2 interrupts for I2C_M_RECV_LEN
195 * transactions. The length is updated during the first
196 * interrupt, and the buffer contents are only copied
197 * during subsequent interrupts. If in case the interrupts
198 * get merged we would complete the transaction without
199 * copying out the bytes from RX fifo. To avoid this now we
200 * drain the fifo as and when data is available.
201 * We drained the rlen byte already, decrement total length
202 * by one.
203 */
204
205 len--;
206 if (rlen > I2C_SMBUS_BLOCK_MAX || rlen == 0) {
207 rlen = 0; /*abort transfer */
208 priv->msg_buf_remaining = 0;
209 priv->msg_len = 0;
210 xlp9xx_i2c_update_rlen(priv);
211 return;
212 }
213
214 *buf++ = rlen;
215 if (priv->client_pec)
216 ++rlen; /* account for error check byte */
217 /* update remaining bytes and message length */
218 priv->msg_buf_remaining = rlen;
219 priv->msg_len = rlen + 1;
220 xlp9xx_i2c_update_rlen(priv);
221 priv->len_recv = false;
222 }
223
224 len = min(priv->msg_buf_remaining, len);
225 for (i = 0; i < len; i++, buf++)
226 *buf = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_MRXFIFO);
227
228 priv->msg_buf_remaining -= len;
229 priv->msg_buf = buf;
230
231 if (priv->msg_buf_remaining)
232 xlp9xx_i2c_update_rx_fifo_thres(priv);
233}
234
235static irqreturn_t xlp9xx_i2c_isr(int irq, void *dev_id)
236{
237 struct xlp9xx_i2c_dev *priv = dev_id;
238 u32 status;
239
240 status = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_INTST);
241 if (status == 0)
242 return IRQ_NONE;
243
244 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTST, status);
245 if (status & XLP9XX_I2C_STATUS_ERRMASK) {
246 priv->msg_err = status;
247 goto xfer_done;
248 }
249
250 /* SADDR ACK for SMBUS_QUICK */
251 if ((status & XLP9XX_I2C_INTEN_SADDR) && (priv->msg_len == 0))
252 goto xfer_done;
253
254 if (!priv->msg_read) {
255 if (status & XLP9XX_I2C_INTEN_MFIFOEMTY) {
256 /* TX FIFO got empty, fill it up again */
257 if (priv->msg_buf_remaining)
258 xlp9xx_i2c_fill_tx_fifo(priv);
259 else
260 xlp9xx_i2c_mask_irq(priv,
261 XLP9XX_I2C_INTEN_MFIFOEMTY);
262 }
263 } else {
264 if (status & (XLP9XX_I2C_INTEN_DATADONE |
265 XLP9XX_I2C_INTEN_MFIFOHI)) {
266 /* data is in FIFO, read it */
267 if (priv->msg_buf_remaining)
268 xlp9xx_i2c_drain_rx_fifo(priv);
269 }
270 }
271
272 /* Transfer complete */
273 if (status & XLP9XX_I2C_INTEN_DATADONE)
274 goto xfer_done;
275
276 return IRQ_HANDLED;
277
278xfer_done:
279 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, 0);
280 complete(&priv->msg_complete);
281 return IRQ_HANDLED;
282}
283
284static int xlp9xx_i2c_check_bus_status(struct xlp9xx_i2c_dev *priv)
285{
286 u32 status;
287 u32 busy_timeout = XLP9XX_I2C_BUSY_TIMEOUT;
288
289 while (busy_timeout) {
290 status = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_STATUS);
291 if ((status & XLP9XX_I2C_STATUS_BUSY) == 0)
292 break;
293
294 busy_timeout--;
295 usleep_range(1000, 1100);
296 }
297
298 if (!busy_timeout)
299 return -EIO;
300
301 return 0;
302}
303
304static int xlp9xx_i2c_init(struct xlp9xx_i2c_dev *priv)
305{
306 u32 prescale;
307
308 /*
309 * The controller uses 5 * SCL clock internally.
310 * So prescale value should be divided by 5.
311 */
312 prescale = DIV_ROUND_UP(priv->ip_clk_hz, priv->clk_hz);
313 prescale = ((prescale - 8) / 5) - 1;
314 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, XLP9XX_I2C_CTRL_RST);
315 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, XLP9XX_I2C_CTRL_EN |
316 XLP9XX_I2C_CTRL_MASTER);
317 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_DIV, prescale);
318 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, 0);
319
320 return 0;
321}
322
323static int xlp9xx_i2c_xfer_msg(struct xlp9xx_i2c_dev *priv, struct i2c_msg *msg,
324 int last_msg)
325{
326 unsigned long timeleft;
327 u32 intr_mask, cmd, val, len;
328
329 priv->msg_buf = msg->buf;
330 priv->msg_buf_remaining = priv->msg_len = msg->len;
331 priv->msg_err = 0;
332 priv->msg_read = (msg->flags & I2C_M_RD);
333 reinit_completion(&priv->msg_complete);
334
335 /* Reset FIFO */
336 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_MFIFOCTRL,
337 XLP9XX_I2C_MFIFOCTRL_RST);
338
339 /* set slave addr */
340 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_SLAVEADDR,
341 (msg->addr << XLP9XX_I2C_SLAVEADDR_ADDR_SHIFT) |
342 (priv->msg_read ? XLP9XX_I2C_SLAVEADDR_RW : 0));
343
344 /* Build control word for transfer */
345 val = xlp9xx_read_i2c_reg(priv, XLP9XX_I2C_CTRL);
346 if (!priv->msg_read)
347 val &= ~XLP9XX_I2C_CTRL_FIFORD;
348 else
349 val |= XLP9XX_I2C_CTRL_FIFORD; /* read */
350
351 if (msg->flags & I2C_M_TEN)
352 val |= XLP9XX_I2C_CTRL_ADDMODE; /* 10-bit address mode*/
353 else
354 val &= ~XLP9XX_I2C_CTRL_ADDMODE;
355
356 priv->len_recv = msg->flags & I2C_M_RECV_LEN;
357 len = priv->len_recv ? I2C_SMBUS_BLOCK_MAX + 2 : msg->len;
358 priv->client_pec = msg->flags & I2C_CLIENT_PEC;
359
360 /* set FIFO threshold if reading */
361 if (priv->msg_read)
362 xlp9xx_i2c_update_rx_fifo_thres(priv);
363
364 /* set data length to be transferred */
365 val = (val & ~XLP9XX_I2C_CTRL_MCTLEN_MASK) |
366 (len << XLP9XX_I2C_CTRL_MCTLEN_SHIFT);
367 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, val);
368
369 /* fill fifo during tx */
370 if (!priv->msg_read)
371 xlp9xx_i2c_fill_tx_fifo(priv);
372
373 /* set interrupt mask */
374 intr_mask = (XLP9XX_I2C_INTEN_ARLOST | XLP9XX_I2C_INTEN_BUSERR |
375 XLP9XX_I2C_INTEN_NACKADDR | XLP9XX_I2C_INTEN_DATADONE);
376
377 if (priv->msg_read) {
378 intr_mask |= XLP9XX_I2C_INTEN_MFIFOHI;
379 if (msg->len == 0)
380 intr_mask |= XLP9XX_I2C_INTEN_SADDR;
381 } else {
382 if (msg->len == 0)
383 intr_mask |= XLP9XX_I2C_INTEN_SADDR;
384 else
385 intr_mask |= XLP9XX_I2C_INTEN_MFIFOEMTY;
386 }
387 xlp9xx_i2c_unmask_irq(priv, intr_mask);
388
389 /* set cmd reg */
390 cmd = XLP9XX_I2C_CMD_START;
391 if (msg->len)
392 cmd |= (priv->msg_read ?
393 XLP9XX_I2C_CMD_READ : XLP9XX_I2C_CMD_WRITE);
394 if (last_msg)
395 cmd |= XLP9XX_I2C_CMD_STOP;
396
397 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CMD, cmd);
398
399 timeleft = msecs_to_jiffies(XLP9XX_I2C_TIMEOUT_MS);
400 timeleft = wait_for_completion_timeout(&priv->msg_complete, timeleft);
401
402 if (priv->msg_err & XLP9XX_I2C_INTEN_BUSERR) {
403 dev_dbg(priv->dev, "transfer error %x!\n", priv->msg_err);
404 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CMD, XLP9XX_I2C_CMD_STOP);
405 return -EIO;
406 } else if (priv->msg_err & XLP9XX_I2C_INTEN_NACKADDR) {
407 return -ENXIO;
408 }
409
410 if (timeleft == 0) {
411 dev_dbg(priv->dev, "i2c transfer timed out!\n");
412 xlp9xx_i2c_init(priv);
413 return -ETIMEDOUT;
414 }
415
416 /* update msg->len with actual received length */
417 if (msg->flags & I2C_M_RECV_LEN) {
418 if (!priv->msg_len)
419 return -EPROTO;
420 msg->len = priv->msg_len;
421 }
422 return 0;
423}
424
425static int xlp9xx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
426 int num)
427{
428 int i, ret;
429 struct xlp9xx_i2c_dev *priv = i2c_get_adapdata(adap);
430
431 ret = xlp9xx_i2c_check_bus_status(priv);
432 if (ret) {
433 xlp9xx_i2c_init(priv);
434 ret = xlp9xx_i2c_check_bus_status(priv);
435 if (ret)
436 return ret;
437 }
438
439 for (i = 0; i < num; i++) {
440 ret = xlp9xx_i2c_xfer_msg(priv, &msgs[i], i == num - 1);
441 if (ret != 0)
442 return ret;
443 }
444
445 return num;
446}
447
448static u32 xlp9xx_i2c_functionality(struct i2c_adapter *adapter)
449{
450 return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_SMBUS_READ_BLOCK_DATA |
451 I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR;
452}
453
454static const struct i2c_algorithm xlp9xx_i2c_algo = {
455 .master_xfer = xlp9xx_i2c_xfer,
456 .functionality = xlp9xx_i2c_functionality,
457};
458
459static int xlp9xx_i2c_get_frequency(struct platform_device *pdev,
460 struct xlp9xx_i2c_dev *priv)
461{
462 struct clk *clk;
463 u32 freq;
464 int err;
465
466 clk = devm_clk_get(&pdev->dev, NULL);
467 if (IS_ERR(clk)) {
468 priv->ip_clk_hz = XLP9XX_I2C_IP_CLK_FREQ;
469 dev_dbg(&pdev->dev, "using default input frequency %u\n",
470 priv->ip_clk_hz);
471 } else {
472 priv->ip_clk_hz = clk_get_rate(clk);
473 }
474
475 err = device_property_read_u32(&pdev->dev, "clock-frequency", &freq);
476 if (err) {
477 freq = I2C_MAX_STANDARD_MODE_FREQ;
478 dev_dbg(&pdev->dev, "using default frequency %u\n", freq);
479 } else if (freq == 0 || freq > I2C_MAX_FAST_MODE_FREQ) {
480 dev_warn(&pdev->dev, "invalid frequency %u, using default\n",
481 freq);
482 freq = I2C_MAX_STANDARD_MODE_FREQ;
483 }
484 priv->clk_hz = freq;
485
486 return 0;
487}
488
489static int xlp9xx_i2c_smbus_setup(struct xlp9xx_i2c_dev *priv,
490 struct platform_device *pdev)
491{
492 struct i2c_client *ara;
493
494 if (!priv->alert_data.irq)
495 return -EINVAL;
496
497 ara = i2c_new_smbus_alert_device(&priv->adapter, &priv->alert_data);
498 if (IS_ERR(ara))
499 return PTR_ERR(ara);
500
501 priv->ara = ara;
502
503 return 0;
504}
505
506static int xlp9xx_i2c_probe(struct platform_device *pdev)
507{
508 struct xlp9xx_i2c_dev *priv;
509 int err = 0;
510
511 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
512 if (!priv)
513 return -ENOMEM;
514
515 priv->base = devm_platform_ioremap_resource(pdev, 0);
516 if (IS_ERR(priv->base))
517 return PTR_ERR(priv->base);
518
519 priv->irq = platform_get_irq(pdev, 0);
520 if (priv->irq < 0)
521 return priv->irq;
522 /* SMBAlert irq */
523 priv->alert_data.irq = platform_get_irq(pdev, 1);
524 if (priv->alert_data.irq <= 0)
525 priv->alert_data.irq = 0;
526
527 xlp9xx_i2c_get_frequency(pdev, priv);
528 xlp9xx_i2c_init(priv);
529
530 err = devm_request_irq(&pdev->dev, priv->irq, xlp9xx_i2c_isr, 0,
531 pdev->name, priv);
532 if (err)
533 return dev_err_probe(&pdev->dev, err, "IRQ request failed!\n");
534
535 init_completion(&priv->msg_complete);
536 priv->adapter.dev.parent = &pdev->dev;
537 priv->adapter.algo = &xlp9xx_i2c_algo;
538 priv->adapter.class = I2C_CLASS_HWMON;
539 ACPI_COMPANION_SET(&priv->adapter.dev, ACPI_COMPANION(&pdev->dev));
540 priv->adapter.dev.of_node = pdev->dev.of_node;
541 priv->dev = &pdev->dev;
542
543 snprintf(priv->adapter.name, sizeof(priv->adapter.name), "xlp9xx-i2c");
544 i2c_set_adapdata(&priv->adapter, priv);
545
546 err = i2c_add_adapter(&priv->adapter);
547 if (err)
548 return err;
549
550 err = xlp9xx_i2c_smbus_setup(priv, pdev);
551 if (err)
552 dev_dbg(&pdev->dev, "No active SMBus alert %d\n", err);
553
554 platform_set_drvdata(pdev, priv);
555 dev_dbg(&pdev->dev, "I2C bus:%d added\n", priv->adapter.nr);
556
557 return 0;
558}
559
560static void xlp9xx_i2c_remove(struct platform_device *pdev)
561{
562 struct xlp9xx_i2c_dev *priv;
563
564 priv = platform_get_drvdata(pdev);
565 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_INTEN, 0);
566 synchronize_irq(priv->irq);
567 i2c_del_adapter(&priv->adapter);
568 xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CTRL, 0);
569}
570
571#ifdef CONFIG_ACPI
572static const struct acpi_device_id xlp9xx_i2c_acpi_ids[] = {
573 {"BRCM9007", 0},
574 {"CAV9007", 0},
575 {}
576};
577MODULE_DEVICE_TABLE(acpi, xlp9xx_i2c_acpi_ids);
578#endif
579
580static struct platform_driver xlp9xx_i2c_driver = {
581 .probe = xlp9xx_i2c_probe,
582 .remove_new = xlp9xx_i2c_remove,
583 .driver = {
584 .name = "xlp9xx-i2c",
585 .acpi_match_table = ACPI_PTR(xlp9xx_i2c_acpi_ids),
586 },
587};
588
589module_platform_driver(xlp9xx_i2c_driver);
590
591MODULE_AUTHOR("Subhendu Sekhar Behera <sbehera@broadcom.com>");
592MODULE_DESCRIPTION("XLP9XX/5XX I2C Bus Controller Driver");
593MODULE_LICENSE("GPL v2");