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[thirdparty/kernel/stable.git] / drivers / i2c / busses / i2c-cpm.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Freescale CPM1/CPM2 I2C interface.
4 * Copyright (c) 1999 Dan Malek (dmalek@jlc.net).
5 *
6 * moved into proper i2c interface;
7 * Brad Parker (brad@heeltoe.com)
8 *
9 * Parts from dbox2_i2c.c (cvs.tuxbox.org)
10 * (C) 2000-2001 Felix Domke (tmbinc@gmx.net), Gillem (htoa@gmx.net)
11 *
12 * (C) 2007 Montavista Software, Inc.
13 * Vitaly Bordug <vitb@kernel.crashing.org>
14 *
15 * Converted to of_platform_device. Renamed to i2c-cpm.c.
16 * (C) 2007,2008 Jochen Friedrich <jochen@scram.de>
17 */
18
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/delay.h>
22 #include <linux/slab.h>
23 #include <linux/interrupt.h>
24 #include <linux/errno.h>
25 #include <linux/stddef.h>
26 #include <linux/i2c.h>
27 #include <linux/io.h>
28 #include <linux/dma-mapping.h>
29 #include <linux/of_address.h>
30 #include <linux/of_device.h>
31 #include <linux/of_irq.h>
32 #include <linux/of_platform.h>
33 #include <sysdev/fsl_soc.h>
34 #include <asm/cpm.h>
35
36 /* Try to define this if you have an older CPU (earlier than rev D4) */
37 /* However, better use a GPIO based bitbang driver in this case :/ */
38 #undef I2C_CHIP_ERRATA
39
40 #define CPM_MAX_READ 513
41 #define CPM_MAXBD 4
42
43 #define I2C_EB (0x10) /* Big endian mode */
44 #define I2C_EB_CPM2 (0x30) /* Big endian mode, memory snoop */
45
46 #define DPRAM_BASE ((u8 __iomem __force *)cpm_muram_addr(0))
47
48 /* I2C parameter RAM. */
49 struct i2c_ram {
50 ushort rbase; /* Rx Buffer descriptor base address */
51 ushort tbase; /* Tx Buffer descriptor base address */
52 u_char rfcr; /* Rx function code */
53 u_char tfcr; /* Tx function code */
54 ushort mrblr; /* Max receive buffer length */
55 uint rstate; /* Internal */
56 uint rdp; /* Internal */
57 ushort rbptr; /* Rx Buffer descriptor pointer */
58 ushort rbc; /* Internal */
59 uint rxtmp; /* Internal */
60 uint tstate; /* Internal */
61 uint tdp; /* Internal */
62 ushort tbptr; /* Tx Buffer descriptor pointer */
63 ushort tbc; /* Internal */
64 uint txtmp; /* Internal */
65 char res1[4]; /* Reserved */
66 ushort rpbase; /* Relocation pointer */
67 char res2[2]; /* Reserved */
68 };
69
70 #define I2COM_START 0x80
71 #define I2COM_MASTER 0x01
72 #define I2CER_TXE 0x10
73 #define I2CER_BUSY 0x04
74 #define I2CER_TXB 0x02
75 #define I2CER_RXB 0x01
76 #define I2MOD_EN 0x01
77
78 /* I2C Registers */
79 struct i2c_reg {
80 u8 i2mod;
81 u8 res1[3];
82 u8 i2add;
83 u8 res2[3];
84 u8 i2brg;
85 u8 res3[3];
86 u8 i2com;
87 u8 res4[3];
88 u8 i2cer;
89 u8 res5[3];
90 u8 i2cmr;
91 };
92
93 struct cpm_i2c {
94 char *base;
95 struct platform_device *ofdev;
96 struct i2c_adapter adap;
97 uint dp_addr;
98 int version; /* CPM1=1, CPM2=2 */
99 int irq;
100 int cp_command;
101 int freq;
102 struct i2c_reg __iomem *i2c_reg;
103 struct i2c_ram __iomem *i2c_ram;
104 u16 i2c_addr;
105 wait_queue_head_t i2c_wait;
106 cbd_t __iomem *tbase;
107 cbd_t __iomem *rbase;
108 u_char *txbuf[CPM_MAXBD];
109 u_char *rxbuf[CPM_MAXBD];
110 dma_addr_t txdma[CPM_MAXBD];
111 dma_addr_t rxdma[CPM_MAXBD];
112 };
113
114 static irqreturn_t cpm_i2c_interrupt(int irq, void *dev_id)
115 {
116 struct cpm_i2c *cpm;
117 struct i2c_reg __iomem *i2c_reg;
118 struct i2c_adapter *adap = dev_id;
119 int i;
120
121 cpm = i2c_get_adapdata(dev_id);
122 i2c_reg = cpm->i2c_reg;
123
124 /* Clear interrupt. */
125 i = in_8(&i2c_reg->i2cer);
126 out_8(&i2c_reg->i2cer, i);
127
128 dev_dbg(&adap->dev, "Interrupt: %x\n", i);
129
130 wake_up(&cpm->i2c_wait);
131
132 return i ? IRQ_HANDLED : IRQ_NONE;
133 }
134
135 static void cpm_reset_i2c_params(struct cpm_i2c *cpm)
136 {
137 struct i2c_ram __iomem *i2c_ram = cpm->i2c_ram;
138
139 /* Set up the I2C parameters in the parameter ram. */
140 out_be16(&i2c_ram->tbase, (u8 __iomem *)cpm->tbase - DPRAM_BASE);
141 out_be16(&i2c_ram->rbase, (u8 __iomem *)cpm->rbase - DPRAM_BASE);
142
143 if (cpm->version == 1) {
144 out_8(&i2c_ram->tfcr, I2C_EB);
145 out_8(&i2c_ram->rfcr, I2C_EB);
146 } else {
147 out_8(&i2c_ram->tfcr, I2C_EB_CPM2);
148 out_8(&i2c_ram->rfcr, I2C_EB_CPM2);
149 }
150
151 out_be16(&i2c_ram->mrblr, CPM_MAX_READ);
152
153 out_be32(&i2c_ram->rstate, 0);
154 out_be32(&i2c_ram->rdp, 0);
155 out_be16(&i2c_ram->rbptr, 0);
156 out_be16(&i2c_ram->rbc, 0);
157 out_be32(&i2c_ram->rxtmp, 0);
158 out_be32(&i2c_ram->tstate, 0);
159 out_be32(&i2c_ram->tdp, 0);
160 out_be16(&i2c_ram->tbptr, 0);
161 out_be16(&i2c_ram->tbc, 0);
162 out_be32(&i2c_ram->txtmp, 0);
163 }
164
165 static void cpm_i2c_force_close(struct i2c_adapter *adap)
166 {
167 struct cpm_i2c *cpm = i2c_get_adapdata(adap);
168 struct i2c_reg __iomem *i2c_reg = cpm->i2c_reg;
169
170 dev_dbg(&adap->dev, "cpm_i2c_force_close()\n");
171
172 cpm_command(cpm->cp_command, CPM_CR_CLOSE_RX_BD);
173
174 out_8(&i2c_reg->i2cmr, 0x00); /* Disable all interrupts */
175 out_8(&i2c_reg->i2cer, 0xff);
176 }
177
178 static void cpm_i2c_parse_message(struct i2c_adapter *adap,
179 struct i2c_msg *pmsg, int num, int tx, int rx)
180 {
181 cbd_t __iomem *tbdf;
182 cbd_t __iomem *rbdf;
183 u_char addr;
184 u_char *tb;
185 u_char *rb;
186 struct cpm_i2c *cpm = i2c_get_adapdata(adap);
187
188 tbdf = cpm->tbase + tx;
189 rbdf = cpm->rbase + rx;
190
191 addr = i2c_8bit_addr_from_msg(pmsg);
192
193 tb = cpm->txbuf[tx];
194 rb = cpm->rxbuf[rx];
195
196 /* Align read buffer */
197 rb = (u_char *) (((ulong) rb + 1) & ~1);
198
199 tb[0] = addr; /* Device address byte w/rw flag */
200
201 out_be16(&tbdf->cbd_datlen, pmsg->len + 1);
202 out_be16(&tbdf->cbd_sc, 0);
203
204 if (!(pmsg->flags & I2C_M_NOSTART))
205 setbits16(&tbdf->cbd_sc, BD_I2C_START);
206
207 if (tx + 1 == num)
208 setbits16(&tbdf->cbd_sc, BD_SC_LAST | BD_SC_WRAP);
209
210 if (pmsg->flags & I2C_M_RD) {
211 /*
212 * To read, we need an empty buffer of the proper length.
213 * All that is used is the first byte for address, the remainder
214 * is just used for timing (and doesn't really have to exist).
215 */
216
217 dev_dbg(&adap->dev, "cpm_i2c_read(abyte=0x%x)\n", addr);
218
219 out_be16(&rbdf->cbd_datlen, 0);
220 out_be16(&rbdf->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT);
221
222 if (rx + 1 == CPM_MAXBD)
223 setbits16(&rbdf->cbd_sc, BD_SC_WRAP);
224
225 eieio();
226 setbits16(&tbdf->cbd_sc, BD_SC_READY);
227 } else {
228 dev_dbg(&adap->dev, "cpm_i2c_write(abyte=0x%x)\n", addr);
229
230 memcpy(tb+1, pmsg->buf, pmsg->len);
231
232 eieio();
233 setbits16(&tbdf->cbd_sc, BD_SC_READY | BD_SC_INTRPT);
234 }
235 }
236
237 static int cpm_i2c_check_message(struct i2c_adapter *adap,
238 struct i2c_msg *pmsg, int tx, int rx)
239 {
240 cbd_t __iomem *tbdf;
241 cbd_t __iomem *rbdf;
242 u_char *tb;
243 u_char *rb;
244 struct cpm_i2c *cpm = i2c_get_adapdata(adap);
245
246 tbdf = cpm->tbase + tx;
247 rbdf = cpm->rbase + rx;
248
249 tb = cpm->txbuf[tx];
250 rb = cpm->rxbuf[rx];
251
252 /* Align read buffer */
253 rb = (u_char *) (((uint) rb + 1) & ~1);
254
255 eieio();
256 if (pmsg->flags & I2C_M_RD) {
257 dev_dbg(&adap->dev, "tx sc 0x%04x, rx sc 0x%04x\n",
258 in_be16(&tbdf->cbd_sc), in_be16(&rbdf->cbd_sc));
259
260 if (in_be16(&tbdf->cbd_sc) & BD_SC_NAK) {
261 dev_dbg(&adap->dev, "I2C read; No ack\n");
262 return -ENXIO;
263 }
264 if (in_be16(&rbdf->cbd_sc) & BD_SC_EMPTY) {
265 dev_err(&adap->dev,
266 "I2C read; complete but rbuf empty\n");
267 return -EREMOTEIO;
268 }
269 if (in_be16(&rbdf->cbd_sc) & BD_SC_OV) {
270 dev_err(&adap->dev, "I2C read; Overrun\n");
271 return -EREMOTEIO;
272 }
273 memcpy(pmsg->buf, rb, pmsg->len);
274 } else {
275 dev_dbg(&adap->dev, "tx sc %d 0x%04x\n", tx,
276 in_be16(&tbdf->cbd_sc));
277
278 if (in_be16(&tbdf->cbd_sc) & BD_SC_NAK) {
279 dev_dbg(&adap->dev, "I2C write; No ack\n");
280 return -ENXIO;
281 }
282 if (in_be16(&tbdf->cbd_sc) & BD_SC_UN) {
283 dev_err(&adap->dev, "I2C write; Underrun\n");
284 return -EIO;
285 }
286 if (in_be16(&tbdf->cbd_sc) & BD_SC_CL) {
287 dev_err(&adap->dev, "I2C write; Collision\n");
288 return -EIO;
289 }
290 }
291 return 0;
292 }
293
294 static int cpm_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
295 {
296 struct cpm_i2c *cpm = i2c_get_adapdata(adap);
297 struct i2c_reg __iomem *i2c_reg = cpm->i2c_reg;
298 struct i2c_ram __iomem *i2c_ram = cpm->i2c_ram;
299 struct i2c_msg *pmsg;
300 int ret;
301 int tptr;
302 int rptr;
303 cbd_t __iomem *tbdf;
304 cbd_t __iomem *rbdf;
305
306 /* Reset to use first buffer */
307 out_be16(&i2c_ram->rbptr, in_be16(&i2c_ram->rbase));
308 out_be16(&i2c_ram->tbptr, in_be16(&i2c_ram->tbase));
309
310 tbdf = cpm->tbase;
311 rbdf = cpm->rbase;
312
313 tptr = 0;
314 rptr = 0;
315
316 /*
317 * If there was a collision in the last i2c transaction,
318 * Set I2COM_MASTER as it was cleared during collision.
319 */
320 if (in_be16(&tbdf->cbd_sc) & BD_SC_CL) {
321 out_8(&cpm->i2c_reg->i2com, I2COM_MASTER);
322 }
323
324 while (tptr < num) {
325 pmsg = &msgs[tptr];
326 dev_dbg(&adap->dev, "R: %d T: %d\n", rptr, tptr);
327
328 cpm_i2c_parse_message(adap, pmsg, num, tptr, rptr);
329 if (pmsg->flags & I2C_M_RD)
330 rptr++;
331 tptr++;
332 }
333 /* Start transfer now */
334 /* Enable RX/TX/Error interupts */
335 out_8(&i2c_reg->i2cmr, I2CER_TXE | I2CER_TXB | I2CER_RXB);
336 out_8(&i2c_reg->i2cer, 0xff); /* Clear interrupt status */
337 /* Chip bug, set enable here */
338 setbits8(&i2c_reg->i2mod, I2MOD_EN); /* Enable */
339 /* Begin transmission */
340 setbits8(&i2c_reg->i2com, I2COM_START);
341
342 tptr = 0;
343 rptr = 0;
344
345 while (tptr < num) {
346 /* Check for outstanding messages */
347 dev_dbg(&adap->dev, "test ready.\n");
348 pmsg = &msgs[tptr];
349 if (pmsg->flags & I2C_M_RD)
350 ret = wait_event_timeout(cpm->i2c_wait,
351 (in_be16(&tbdf[tptr].cbd_sc) & BD_SC_NAK) ||
352 !(in_be16(&rbdf[rptr].cbd_sc) & BD_SC_EMPTY),
353 1 * HZ);
354 else
355 ret = wait_event_timeout(cpm->i2c_wait,
356 !(in_be16(&tbdf[tptr].cbd_sc) & BD_SC_READY),
357 1 * HZ);
358 if (ret == 0) {
359 ret = -EREMOTEIO;
360 dev_err(&adap->dev, "I2C transfer: timeout\n");
361 goto out_err;
362 }
363 if (ret > 0) {
364 dev_dbg(&adap->dev, "ready.\n");
365 ret = cpm_i2c_check_message(adap, pmsg, tptr, rptr);
366 tptr++;
367 if (pmsg->flags & I2C_M_RD)
368 rptr++;
369 if (ret)
370 goto out_err;
371 }
372 }
373 #ifdef I2C_CHIP_ERRATA
374 /*
375 * Chip errata, clear enable. This is not needed on rev D4 CPUs.
376 * Disabling I2C too early may cause too short stop condition
377 */
378 udelay(4);
379 clrbits8(&i2c_reg->i2mod, I2MOD_EN);
380 #endif
381 return (num);
382
383 out_err:
384 cpm_i2c_force_close(adap);
385 #ifdef I2C_CHIP_ERRATA
386 /*
387 * Chip errata, clear enable. This is not needed on rev D4 CPUs.
388 */
389 clrbits8(&i2c_reg->i2mod, I2MOD_EN);
390 #endif
391 return ret;
392 }
393
394 static u32 cpm_i2c_func(struct i2c_adapter *adap)
395 {
396 return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
397 }
398
399 /* -----exported algorithm data: ------------------------------------- */
400
401 static const struct i2c_algorithm cpm_i2c_algo = {
402 .master_xfer = cpm_i2c_xfer,
403 .functionality = cpm_i2c_func,
404 };
405
406 /* CPM_MAX_READ is also limiting writes according to the code! */
407 static const struct i2c_adapter_quirks cpm_i2c_quirks = {
408 .max_num_msgs = CPM_MAXBD,
409 .max_read_len = CPM_MAX_READ,
410 .max_write_len = CPM_MAX_READ,
411 };
412
413 static const struct i2c_adapter cpm_ops = {
414 .owner = THIS_MODULE,
415 .name = "i2c-cpm",
416 .algo = &cpm_i2c_algo,
417 .quirks = &cpm_i2c_quirks,
418 };
419
420 static int cpm_i2c_setup(struct cpm_i2c *cpm)
421 {
422 struct platform_device *ofdev = cpm->ofdev;
423 const u32 *data;
424 int len, ret, i;
425 void __iomem *i2c_base;
426 cbd_t __iomem *tbdf;
427 cbd_t __iomem *rbdf;
428 unsigned char brg;
429
430 dev_dbg(&cpm->ofdev->dev, "cpm_i2c_setup()\n");
431
432 init_waitqueue_head(&cpm->i2c_wait);
433
434 cpm->irq = irq_of_parse_and_map(ofdev->dev.of_node, 0);
435 if (!cpm->irq)
436 return -EINVAL;
437
438 /* Install interrupt handler. */
439 ret = request_irq(cpm->irq, cpm_i2c_interrupt, 0, "cpm_i2c",
440 &cpm->adap);
441 if (ret)
442 return ret;
443
444 /* I2C parameter RAM */
445 i2c_base = of_iomap(ofdev->dev.of_node, 1);
446 if (i2c_base == NULL) {
447 ret = -EINVAL;
448 goto out_irq;
449 }
450
451 if (of_device_is_compatible(ofdev->dev.of_node, "fsl,cpm1-i2c")) {
452
453 /* Check for and use a microcode relocation patch. */
454 cpm->i2c_ram = i2c_base;
455 cpm->i2c_addr = in_be16(&cpm->i2c_ram->rpbase);
456
457 /*
458 * Maybe should use cpm_muram_alloc instead of hardcoding
459 * this in micropatch.c
460 */
461 if (cpm->i2c_addr) {
462 cpm->i2c_ram = cpm_muram_addr(cpm->i2c_addr);
463 iounmap(i2c_base);
464 }
465
466 cpm->version = 1;
467
468 } else if (of_device_is_compatible(ofdev->dev.of_node, "fsl,cpm2-i2c")) {
469 cpm->i2c_addr = cpm_muram_alloc(sizeof(struct i2c_ram), 64);
470 cpm->i2c_ram = cpm_muram_addr(cpm->i2c_addr);
471 out_be16(i2c_base, cpm->i2c_addr);
472 iounmap(i2c_base);
473
474 cpm->version = 2;
475
476 } else {
477 iounmap(i2c_base);
478 ret = -EINVAL;
479 goto out_irq;
480 }
481
482 /* I2C control/status registers */
483 cpm->i2c_reg = of_iomap(ofdev->dev.of_node, 0);
484 if (cpm->i2c_reg == NULL) {
485 ret = -EINVAL;
486 goto out_ram;
487 }
488
489 data = of_get_property(ofdev->dev.of_node, "fsl,cpm-command", &len);
490 if (!data || len != 4) {
491 ret = -EINVAL;
492 goto out_reg;
493 }
494 cpm->cp_command = *data;
495
496 data = of_get_property(ofdev->dev.of_node, "linux,i2c-class", &len);
497 if (data && len == 4)
498 cpm->adap.class = *data;
499
500 data = of_get_property(ofdev->dev.of_node, "clock-frequency", &len);
501 if (data && len == 4)
502 cpm->freq = *data;
503 else
504 cpm->freq = 60000; /* use 60kHz i2c clock by default */
505
506 /*
507 * Allocate space for CPM_MAXBD transmit and receive buffer
508 * descriptors in the DP ram.
509 */
510 cpm->dp_addr = cpm_muram_alloc(sizeof(cbd_t) * 2 * CPM_MAXBD, 8);
511 if (!cpm->dp_addr) {
512 ret = -ENOMEM;
513 goto out_reg;
514 }
515
516 cpm->tbase = cpm_muram_addr(cpm->dp_addr);
517 cpm->rbase = cpm_muram_addr(cpm->dp_addr + sizeof(cbd_t) * CPM_MAXBD);
518
519 /* Allocate TX and RX buffers */
520
521 tbdf = cpm->tbase;
522 rbdf = cpm->rbase;
523
524 for (i = 0; i < CPM_MAXBD; i++) {
525 cpm->rxbuf[i] = dma_alloc_coherent(&cpm->ofdev->dev,
526 CPM_MAX_READ + 1,
527 &cpm->rxdma[i], GFP_KERNEL);
528 if (!cpm->rxbuf[i]) {
529 ret = -ENOMEM;
530 goto out_muram;
531 }
532 out_be32(&rbdf[i].cbd_bufaddr, ((cpm->rxdma[i] + 1) & ~1));
533
534 cpm->txbuf[i] = (unsigned char *)dma_alloc_coherent(&cpm->ofdev->dev, CPM_MAX_READ + 1, &cpm->txdma[i], GFP_KERNEL);
535 if (!cpm->txbuf[i]) {
536 ret = -ENOMEM;
537 goto out_muram;
538 }
539 out_be32(&tbdf[i].cbd_bufaddr, cpm->txdma[i]);
540 }
541
542 /* Initialize Tx/Rx parameters. */
543
544 cpm_reset_i2c_params(cpm);
545
546 dev_dbg(&cpm->ofdev->dev, "i2c_ram 0x%p, i2c_addr 0x%04x, freq %d\n",
547 cpm->i2c_ram, cpm->i2c_addr, cpm->freq);
548 dev_dbg(&cpm->ofdev->dev, "tbase 0x%04x, rbase 0x%04x\n",
549 (u8 __iomem *)cpm->tbase - DPRAM_BASE,
550 (u8 __iomem *)cpm->rbase - DPRAM_BASE);
551
552 cpm_command(cpm->cp_command, CPM_CR_INIT_TRX);
553
554 /*
555 * Select an invalid address. Just make sure we don't use loopback mode
556 */
557 out_8(&cpm->i2c_reg->i2add, 0x7f << 1);
558
559 /*
560 * PDIV is set to 00 in i2mod, so brgclk/32 is used as input to the
561 * i2c baud rate generator. This is divided by 2 x (DIV + 3) to get
562 * the actual i2c bus frequency.
563 */
564 brg = get_brgfreq() / (32 * 2 * cpm->freq) - 3;
565 out_8(&cpm->i2c_reg->i2brg, brg);
566
567 out_8(&cpm->i2c_reg->i2mod, 0x00);
568 out_8(&cpm->i2c_reg->i2com, I2COM_MASTER); /* Master mode */
569
570 /* Disable interrupts. */
571 out_8(&cpm->i2c_reg->i2cmr, 0);
572 out_8(&cpm->i2c_reg->i2cer, 0xff);
573
574 return 0;
575
576 out_muram:
577 for (i = 0; i < CPM_MAXBD; i++) {
578 if (cpm->rxbuf[i])
579 dma_free_coherent(&cpm->ofdev->dev, CPM_MAX_READ + 1,
580 cpm->rxbuf[i], cpm->rxdma[i]);
581 if (cpm->txbuf[i])
582 dma_free_coherent(&cpm->ofdev->dev, CPM_MAX_READ + 1,
583 cpm->txbuf[i], cpm->txdma[i]);
584 }
585 cpm_muram_free(cpm->dp_addr);
586 out_reg:
587 iounmap(cpm->i2c_reg);
588 out_ram:
589 if ((cpm->version == 1) && (!cpm->i2c_addr))
590 iounmap(cpm->i2c_ram);
591 if (cpm->version == 2)
592 cpm_muram_free(cpm->i2c_addr);
593 out_irq:
594 free_irq(cpm->irq, &cpm->adap);
595 return ret;
596 }
597
598 static void cpm_i2c_shutdown(struct cpm_i2c *cpm)
599 {
600 int i;
601
602 /* Shut down I2C. */
603 clrbits8(&cpm->i2c_reg->i2mod, I2MOD_EN);
604
605 /* Disable interrupts */
606 out_8(&cpm->i2c_reg->i2cmr, 0);
607 out_8(&cpm->i2c_reg->i2cer, 0xff);
608
609 free_irq(cpm->irq, &cpm->adap);
610
611 /* Free all memory */
612 for (i = 0; i < CPM_MAXBD; i++) {
613 dma_free_coherent(&cpm->ofdev->dev, CPM_MAX_READ + 1,
614 cpm->rxbuf[i], cpm->rxdma[i]);
615 dma_free_coherent(&cpm->ofdev->dev, CPM_MAX_READ + 1,
616 cpm->txbuf[i], cpm->txdma[i]);
617 }
618
619 cpm_muram_free(cpm->dp_addr);
620 iounmap(cpm->i2c_reg);
621
622 if ((cpm->version == 1) && (!cpm->i2c_addr))
623 iounmap(cpm->i2c_ram);
624 if (cpm->version == 2)
625 cpm_muram_free(cpm->i2c_addr);
626 }
627
628 static int cpm_i2c_probe(struct platform_device *ofdev)
629 {
630 int result, len;
631 struct cpm_i2c *cpm;
632 const u32 *data;
633
634 cpm = kzalloc(sizeof(struct cpm_i2c), GFP_KERNEL);
635 if (!cpm)
636 return -ENOMEM;
637
638 cpm->ofdev = ofdev;
639
640 platform_set_drvdata(ofdev, cpm);
641
642 cpm->adap = cpm_ops;
643 i2c_set_adapdata(&cpm->adap, cpm);
644 cpm->adap.dev.parent = &ofdev->dev;
645 cpm->adap.dev.of_node = of_node_get(ofdev->dev.of_node);
646
647 result = cpm_i2c_setup(cpm);
648 if (result) {
649 dev_err(&ofdev->dev, "Unable to init hardware\n");
650 goto out_free;
651 }
652
653 /* register new adapter to i2c module... */
654
655 data = of_get_property(ofdev->dev.of_node, "linux,i2c-index", &len);
656 cpm->adap.nr = (data && len == 4) ? be32_to_cpup(data) : -1;
657 result = i2c_add_numbered_adapter(&cpm->adap);
658
659 if (result < 0)
660 goto out_shut;
661
662 dev_dbg(&ofdev->dev, "hw routines for %s registered.\n",
663 cpm->adap.name);
664
665 return 0;
666 out_shut:
667 cpm_i2c_shutdown(cpm);
668 out_free:
669 kfree(cpm);
670
671 return result;
672 }
673
674 static int cpm_i2c_remove(struct platform_device *ofdev)
675 {
676 struct cpm_i2c *cpm = platform_get_drvdata(ofdev);
677
678 i2c_del_adapter(&cpm->adap);
679
680 cpm_i2c_shutdown(cpm);
681
682 kfree(cpm);
683
684 return 0;
685 }
686
687 static const struct of_device_id cpm_i2c_match[] = {
688 {
689 .compatible = "fsl,cpm1-i2c",
690 },
691 {
692 .compatible = "fsl,cpm2-i2c",
693 },
694 {},
695 };
696
697 MODULE_DEVICE_TABLE(of, cpm_i2c_match);
698
699 static struct platform_driver cpm_i2c_driver = {
700 .probe = cpm_i2c_probe,
701 .remove = cpm_i2c_remove,
702 .driver = {
703 .name = "fsl-i2c-cpm",
704 .of_match_table = cpm_i2c_match,
705 },
706 };
707
708 module_platform_driver(cpm_i2c_driver);
709
710 MODULE_AUTHOR("Jochen Friedrich <jochen@scram.de>");
711 MODULE_DESCRIPTION("I2C-Bus adapter routines for CPM boards");
712 MODULE_LICENSE("GPL");
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git