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61045dbe JF |
1 | /* |
2 | * Freescale CPM1/CPM2 I2C interface. | |
3 | * Copyright (c) 1999 Dan Malek (dmalek@jlc.net). | |
4 | * | |
5 | * moved into proper i2c interface; | |
6 | * Brad Parker (brad@heeltoe.com) | |
7 | * | |
8 | * Parts from dbox2_i2c.c (cvs.tuxbox.org) | |
9 | * (C) 2000-2001 Felix Domke (tmbinc@gmx.net), Gillem (htoa@gmx.net) | |
10 | * | |
11 | * (C) 2007 Montavista Software, Inc. | |
12 | * Vitaly Bordug <vitb@kernel.crashing.org> | |
13 | * | |
14 | * Converted to of_platform_device. Renamed to i2c-cpm.c. | |
15 | * (C) 2007,2008 Jochen Friedrich <jochen@scram.de> | |
16 | * | |
17 | * This program is free software; you can redistribute it and/or modify | |
18 | * it under the terms of the GNU General Public License as published by | |
19 | * the Free Software Foundation; either version 2 of the License, or | |
20 | * (at your option) any later version. | |
21 | * | |
22 | * This program is distributed in the hope that it will be useful, | |
23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
25 | * GNU General Public License for more details. | |
61045dbe JF |
26 | */ |
27 | ||
28 | #include <linux/kernel.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/delay.h> | |
31 | #include <linux/slab.h> | |
61045dbe JF |
32 | #include <linux/interrupt.h> |
33 | #include <linux/errno.h> | |
34 | #include <linux/stddef.h> | |
35 | #include <linux/i2c.h> | |
36 | #include <linux/io.h> | |
37 | #include <linux/dma-mapping.h> | |
5f12c5ec | 38 | #include <linux/of_address.h> |
61045dbe | 39 | #include <linux/of_device.h> |
5f12c5ec | 40 | #include <linux/of_irq.h> |
61045dbe | 41 | #include <linux/of_platform.h> |
61045dbe JF |
42 | #include <sysdev/fsl_soc.h> |
43 | #include <asm/cpm.h> | |
44 | ||
45 | /* Try to define this if you have an older CPU (earlier than rev D4) */ | |
46 | /* However, better use a GPIO based bitbang driver in this case :/ */ | |
47 | #undef I2C_CHIP_ERRATA | |
48 | ||
49 | #define CPM_MAX_READ 513 | |
50 | #define CPM_MAXBD 4 | |
51 | ||
52 | #define I2C_EB (0x10) /* Big endian mode */ | |
53 | #define I2C_EB_CPM2 (0x30) /* Big endian mode, memory snoop */ | |
54 | ||
55 | #define DPRAM_BASE ((u8 __iomem __force *)cpm_muram_addr(0)) | |
56 | ||
57 | /* I2C parameter RAM. */ | |
58 | struct i2c_ram { | |
59 | ushort rbase; /* Rx Buffer descriptor base address */ | |
60 | ushort tbase; /* Tx Buffer descriptor base address */ | |
61 | u_char rfcr; /* Rx function code */ | |
62 | u_char tfcr; /* Tx function code */ | |
63 | ushort mrblr; /* Max receive buffer length */ | |
64 | uint rstate; /* Internal */ | |
65 | uint rdp; /* Internal */ | |
66 | ushort rbptr; /* Rx Buffer descriptor pointer */ | |
67 | ushort rbc; /* Internal */ | |
68 | uint rxtmp; /* Internal */ | |
69 | uint tstate; /* Internal */ | |
70 | uint tdp; /* Internal */ | |
71 | ushort tbptr; /* Tx Buffer descriptor pointer */ | |
72 | ushort tbc; /* Internal */ | |
73 | uint txtmp; /* Internal */ | |
74 | char res1[4]; /* Reserved */ | |
75 | ushort rpbase; /* Relocation pointer */ | |
76 | char res2[2]; /* Reserved */ | |
77 | }; | |
78 | ||
79 | #define I2COM_START 0x80 | |
80 | #define I2COM_MASTER 0x01 | |
81 | #define I2CER_TXE 0x10 | |
82 | #define I2CER_BUSY 0x04 | |
83 | #define I2CER_TXB 0x02 | |
84 | #define I2CER_RXB 0x01 | |
85 | #define I2MOD_EN 0x01 | |
86 | ||
87 | /* I2C Registers */ | |
88 | struct i2c_reg { | |
89 | u8 i2mod; | |
90 | u8 res1[3]; | |
91 | u8 i2add; | |
92 | u8 res2[3]; | |
93 | u8 i2brg; | |
94 | u8 res3[3]; | |
95 | u8 i2com; | |
96 | u8 res4[3]; | |
97 | u8 i2cer; | |
98 | u8 res5[3]; | |
99 | u8 i2cmr; | |
100 | }; | |
101 | ||
102 | struct cpm_i2c { | |
103 | char *base; | |
2dc11581 | 104 | struct platform_device *ofdev; |
61045dbe JF |
105 | struct i2c_adapter adap; |
106 | uint dp_addr; | |
107 | int version; /* CPM1=1, CPM2=2 */ | |
108 | int irq; | |
109 | int cp_command; | |
110 | int freq; | |
111 | struct i2c_reg __iomem *i2c_reg; | |
112 | struct i2c_ram __iomem *i2c_ram; | |
113 | u16 i2c_addr; | |
114 | wait_queue_head_t i2c_wait; | |
115 | cbd_t __iomem *tbase; | |
116 | cbd_t __iomem *rbase; | |
117 | u_char *txbuf[CPM_MAXBD]; | |
118 | u_char *rxbuf[CPM_MAXBD]; | |
119 | u32 txdma[CPM_MAXBD]; | |
120 | u32 rxdma[CPM_MAXBD]; | |
121 | }; | |
122 | ||
123 | static irqreturn_t cpm_i2c_interrupt(int irq, void *dev_id) | |
124 | { | |
125 | struct cpm_i2c *cpm; | |
126 | struct i2c_reg __iomem *i2c_reg; | |
127 | struct i2c_adapter *adap = dev_id; | |
128 | int i; | |
129 | ||
130 | cpm = i2c_get_adapdata(dev_id); | |
131 | i2c_reg = cpm->i2c_reg; | |
132 | ||
133 | /* Clear interrupt. */ | |
134 | i = in_8(&i2c_reg->i2cer); | |
135 | out_8(&i2c_reg->i2cer, i); | |
136 | ||
137 | dev_dbg(&adap->dev, "Interrupt: %x\n", i); | |
138 | ||
dc1972d0 | 139 | wake_up(&cpm->i2c_wait); |
61045dbe JF |
140 | |
141 | return i ? IRQ_HANDLED : IRQ_NONE; | |
142 | } | |
143 | ||
144 | static void cpm_reset_i2c_params(struct cpm_i2c *cpm) | |
145 | { | |
146 | struct i2c_ram __iomem *i2c_ram = cpm->i2c_ram; | |
147 | ||
148 | /* Set up the I2C parameters in the parameter ram. */ | |
149 | out_be16(&i2c_ram->tbase, (u8 __iomem *)cpm->tbase - DPRAM_BASE); | |
150 | out_be16(&i2c_ram->rbase, (u8 __iomem *)cpm->rbase - DPRAM_BASE); | |
151 | ||
152 | if (cpm->version == 1) { | |
153 | out_8(&i2c_ram->tfcr, I2C_EB); | |
154 | out_8(&i2c_ram->rfcr, I2C_EB); | |
155 | } else { | |
156 | out_8(&i2c_ram->tfcr, I2C_EB_CPM2); | |
157 | out_8(&i2c_ram->rfcr, I2C_EB_CPM2); | |
158 | } | |
159 | ||
160 | out_be16(&i2c_ram->mrblr, CPM_MAX_READ); | |
161 | ||
162 | out_be32(&i2c_ram->rstate, 0); | |
163 | out_be32(&i2c_ram->rdp, 0); | |
164 | out_be16(&i2c_ram->rbptr, 0); | |
165 | out_be16(&i2c_ram->rbc, 0); | |
166 | out_be32(&i2c_ram->rxtmp, 0); | |
167 | out_be32(&i2c_ram->tstate, 0); | |
168 | out_be32(&i2c_ram->tdp, 0); | |
169 | out_be16(&i2c_ram->tbptr, 0); | |
170 | out_be16(&i2c_ram->tbc, 0); | |
171 | out_be32(&i2c_ram->txtmp, 0); | |
172 | } | |
173 | ||
174 | static void cpm_i2c_force_close(struct i2c_adapter *adap) | |
175 | { | |
176 | struct cpm_i2c *cpm = i2c_get_adapdata(adap); | |
177 | struct i2c_reg __iomem *i2c_reg = cpm->i2c_reg; | |
178 | ||
179 | dev_dbg(&adap->dev, "cpm_i2c_force_close()\n"); | |
180 | ||
181 | cpm_command(cpm->cp_command, CPM_CR_CLOSE_RX_BD); | |
182 | ||
183 | out_8(&i2c_reg->i2cmr, 0x00); /* Disable all interrupts */ | |
184 | out_8(&i2c_reg->i2cer, 0xff); | |
185 | } | |
186 | ||
187 | static void cpm_i2c_parse_message(struct i2c_adapter *adap, | |
188 | struct i2c_msg *pmsg, int num, int tx, int rx) | |
189 | { | |
190 | cbd_t __iomem *tbdf; | |
191 | cbd_t __iomem *rbdf; | |
192 | u_char addr; | |
193 | u_char *tb; | |
194 | u_char *rb; | |
195 | struct cpm_i2c *cpm = i2c_get_adapdata(adap); | |
196 | ||
197 | tbdf = cpm->tbase + tx; | |
198 | rbdf = cpm->rbase + rx; | |
199 | ||
200 | addr = pmsg->addr << 1; | |
201 | if (pmsg->flags & I2C_M_RD) | |
202 | addr |= 1; | |
203 | ||
204 | tb = cpm->txbuf[tx]; | |
205 | rb = cpm->rxbuf[rx]; | |
206 | ||
207 | /* Align read buffer */ | |
208 | rb = (u_char *) (((ulong) rb + 1) & ~1); | |
209 | ||
210 | tb[0] = addr; /* Device address byte w/rw flag */ | |
211 | ||
212 | out_be16(&tbdf->cbd_datlen, pmsg->len + 1); | |
213 | out_be16(&tbdf->cbd_sc, 0); | |
214 | ||
215 | if (!(pmsg->flags & I2C_M_NOSTART)) | |
216 | setbits16(&tbdf->cbd_sc, BD_I2C_START); | |
217 | ||
218 | if (tx + 1 == num) | |
219 | setbits16(&tbdf->cbd_sc, BD_SC_LAST | BD_SC_WRAP); | |
220 | ||
221 | if (pmsg->flags & I2C_M_RD) { | |
222 | /* | |
223 | * To read, we need an empty buffer of the proper length. | |
224 | * All that is used is the first byte for address, the remainder | |
225 | * is just used for timing (and doesn't really have to exist). | |
226 | */ | |
227 | ||
228 | dev_dbg(&adap->dev, "cpm_i2c_read(abyte=0x%x)\n", addr); | |
229 | ||
230 | out_be16(&rbdf->cbd_datlen, 0); | |
231 | out_be16(&rbdf->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT); | |
232 | ||
233 | if (rx + 1 == CPM_MAXBD) | |
234 | setbits16(&rbdf->cbd_sc, BD_SC_WRAP); | |
235 | ||
236 | eieio(); | |
237 | setbits16(&tbdf->cbd_sc, BD_SC_READY); | |
238 | } else { | |
3b270804 | 239 | dev_dbg(&adap->dev, "cpm_i2c_write(abyte=0x%x)\n", addr); |
61045dbe JF |
240 | |
241 | memcpy(tb+1, pmsg->buf, pmsg->len); | |
242 | ||
243 | eieio(); | |
244 | setbits16(&tbdf->cbd_sc, BD_SC_READY | BD_SC_INTRPT); | |
245 | } | |
246 | } | |
247 | ||
248 | static int cpm_i2c_check_message(struct i2c_adapter *adap, | |
249 | struct i2c_msg *pmsg, int tx, int rx) | |
250 | { | |
251 | cbd_t __iomem *tbdf; | |
252 | cbd_t __iomem *rbdf; | |
253 | u_char *tb; | |
254 | u_char *rb; | |
255 | struct cpm_i2c *cpm = i2c_get_adapdata(adap); | |
256 | ||
257 | tbdf = cpm->tbase + tx; | |
258 | rbdf = cpm->rbase + rx; | |
259 | ||
260 | tb = cpm->txbuf[tx]; | |
261 | rb = cpm->rxbuf[rx]; | |
262 | ||
263 | /* Align read buffer */ | |
264 | rb = (u_char *) (((uint) rb + 1) & ~1); | |
265 | ||
266 | eieio(); | |
267 | if (pmsg->flags & I2C_M_RD) { | |
268 | dev_dbg(&adap->dev, "tx sc 0x%04x, rx sc 0x%04x\n", | |
269 | in_be16(&tbdf->cbd_sc), in_be16(&rbdf->cbd_sc)); | |
270 | ||
271 | if (in_be16(&tbdf->cbd_sc) & BD_SC_NAK) { | |
272 | dev_dbg(&adap->dev, "I2C read; No ack\n"); | |
273 | return -ENXIO; | |
274 | } | |
275 | if (in_be16(&rbdf->cbd_sc) & BD_SC_EMPTY) { | |
276 | dev_err(&adap->dev, | |
277 | "I2C read; complete but rbuf empty\n"); | |
278 | return -EREMOTEIO; | |
279 | } | |
280 | if (in_be16(&rbdf->cbd_sc) & BD_SC_OV) { | |
281 | dev_err(&adap->dev, "I2C read; Overrun\n"); | |
282 | return -EREMOTEIO; | |
283 | } | |
284 | memcpy(pmsg->buf, rb, pmsg->len); | |
285 | } else { | |
286 | dev_dbg(&adap->dev, "tx sc %d 0x%04x\n", tx, | |
287 | in_be16(&tbdf->cbd_sc)); | |
288 | ||
289 | if (in_be16(&tbdf->cbd_sc) & BD_SC_NAK) { | |
290 | dev_dbg(&adap->dev, "I2C write; No ack\n"); | |
291 | return -ENXIO; | |
292 | } | |
293 | if (in_be16(&tbdf->cbd_sc) & BD_SC_UN) { | |
294 | dev_err(&adap->dev, "I2C write; Underrun\n"); | |
295 | return -EIO; | |
296 | } | |
297 | if (in_be16(&tbdf->cbd_sc) & BD_SC_CL) { | |
298 | dev_err(&adap->dev, "I2C write; Collision\n"); | |
299 | return -EIO; | |
300 | } | |
301 | } | |
302 | return 0; | |
303 | } | |
304 | ||
305 | static int cpm_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) | |
306 | { | |
307 | struct cpm_i2c *cpm = i2c_get_adapdata(adap); | |
308 | struct i2c_reg __iomem *i2c_reg = cpm->i2c_reg; | |
309 | struct i2c_ram __iomem *i2c_ram = cpm->i2c_ram; | |
310 | struct i2c_msg *pmsg; | |
311 | int ret, i; | |
312 | int tptr; | |
313 | int rptr; | |
314 | cbd_t __iomem *tbdf; | |
315 | cbd_t __iomem *rbdf; | |
316 | ||
317 | if (num > CPM_MAXBD) | |
318 | return -EINVAL; | |
319 | ||
320 | /* Check if we have any oversized READ requests */ | |
321 | for (i = 0; i < num; i++) { | |
322 | pmsg = &msgs[i]; | |
323 | if (pmsg->len >= CPM_MAX_READ) | |
324 | return -EINVAL; | |
325 | } | |
326 | ||
327 | /* Reset to use first buffer */ | |
328 | out_be16(&i2c_ram->rbptr, in_be16(&i2c_ram->rbase)); | |
329 | out_be16(&i2c_ram->tbptr, in_be16(&i2c_ram->tbase)); | |
330 | ||
331 | tbdf = cpm->tbase; | |
332 | rbdf = cpm->rbase; | |
333 | ||
334 | tptr = 0; | |
335 | rptr = 0; | |
336 | ||
a16d8aa4 SS |
337 | /* |
338 | * If there was a collision in the last i2c transaction, | |
339 | * Set I2COM_MASTER as it was cleared during collision. | |
340 | */ | |
341 | if (in_be16(&tbdf->cbd_sc) & BD_SC_CL) { | |
342 | out_8(&cpm->i2c_reg->i2com, I2COM_MASTER); | |
343 | } | |
344 | ||
61045dbe JF |
345 | while (tptr < num) { |
346 | pmsg = &msgs[tptr]; | |
347 | dev_dbg(&adap->dev, "R: %d T: %d\n", rptr, tptr); | |
348 | ||
349 | cpm_i2c_parse_message(adap, pmsg, num, tptr, rptr); | |
350 | if (pmsg->flags & I2C_M_RD) | |
351 | rptr++; | |
352 | tptr++; | |
353 | } | |
354 | /* Start transfer now */ | |
355 | /* Enable RX/TX/Error interupts */ | |
3b270804 | 356 | out_8(&i2c_reg->i2cmr, I2CER_TXE | I2CER_TXB | I2CER_RXB); |
61045dbe JF |
357 | out_8(&i2c_reg->i2cer, 0xff); /* Clear interrupt status */ |
358 | /* Chip bug, set enable here */ | |
359 | setbits8(&i2c_reg->i2mod, I2MOD_EN); /* Enable */ | |
360 | /* Begin transmission */ | |
361 | setbits8(&i2c_reg->i2com, I2COM_START); | |
362 | ||
363 | tptr = 0; | |
364 | rptr = 0; | |
365 | ||
366 | while (tptr < num) { | |
367 | /* Check for outstanding messages */ | |
368 | dev_dbg(&adap->dev, "test ready.\n"); | |
369 | pmsg = &msgs[tptr]; | |
370 | if (pmsg->flags & I2C_M_RD) | |
dc1972d0 | 371 | ret = wait_event_timeout(cpm->i2c_wait, |
a804644a | 372 | (in_be16(&tbdf[tptr].cbd_sc) & BD_SC_NAK) || |
61045dbe JF |
373 | !(in_be16(&rbdf[rptr].cbd_sc) & BD_SC_EMPTY), |
374 | 1 * HZ); | |
375 | else | |
dc1972d0 | 376 | ret = wait_event_timeout(cpm->i2c_wait, |
61045dbe JF |
377 | !(in_be16(&tbdf[tptr].cbd_sc) & BD_SC_READY), |
378 | 1 * HZ); | |
379 | if (ret == 0) { | |
380 | ret = -EREMOTEIO; | |
381 | dev_err(&adap->dev, "I2C transfer: timeout\n"); | |
382 | goto out_err; | |
383 | } | |
384 | if (ret > 0) { | |
385 | dev_dbg(&adap->dev, "ready.\n"); | |
386 | ret = cpm_i2c_check_message(adap, pmsg, tptr, rptr); | |
387 | tptr++; | |
388 | if (pmsg->flags & I2C_M_RD) | |
389 | rptr++; | |
390 | if (ret) | |
391 | goto out_err; | |
392 | } | |
393 | } | |
394 | #ifdef I2C_CHIP_ERRATA | |
395 | /* | |
396 | * Chip errata, clear enable. This is not needed on rev D4 CPUs. | |
397 | * Disabling I2C too early may cause too short stop condition | |
398 | */ | |
399 | udelay(4); | |
400 | clrbits8(&i2c_reg->i2mod, I2MOD_EN); | |
401 | #endif | |
402 | return (num); | |
403 | ||
404 | out_err: | |
405 | cpm_i2c_force_close(adap); | |
406 | #ifdef I2C_CHIP_ERRATA | |
407 | /* | |
408 | * Chip errata, clear enable. This is not needed on rev D4 CPUs. | |
409 | */ | |
410 | clrbits8(&i2c_reg->i2mod, I2MOD_EN); | |
411 | #endif | |
412 | return ret; | |
413 | } | |
414 | ||
415 | static u32 cpm_i2c_func(struct i2c_adapter *adap) | |
416 | { | |
417 | return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK); | |
418 | } | |
419 | ||
420 | /* -----exported algorithm data: ------------------------------------- */ | |
421 | ||
422 | static const struct i2c_algorithm cpm_i2c_algo = { | |
423 | .master_xfer = cpm_i2c_xfer, | |
424 | .functionality = cpm_i2c_func, | |
425 | }; | |
426 | ||
427 | static const struct i2c_adapter cpm_ops = { | |
428 | .owner = THIS_MODULE, | |
429 | .name = "i2c-cpm", | |
430 | .algo = &cpm_i2c_algo, | |
61045dbe JF |
431 | }; |
432 | ||
0b255e92 | 433 | static int cpm_i2c_setup(struct cpm_i2c *cpm) |
61045dbe | 434 | { |
2dc11581 | 435 | struct platform_device *ofdev = cpm->ofdev; |
61045dbe JF |
436 | const u32 *data; |
437 | int len, ret, i; | |
438 | void __iomem *i2c_base; | |
439 | cbd_t __iomem *tbdf; | |
440 | cbd_t __iomem *rbdf; | |
441 | unsigned char brg; | |
442 | ||
443 | dev_dbg(&cpm->ofdev->dev, "cpm_i2c_setup()\n"); | |
444 | ||
445 | init_waitqueue_head(&cpm->i2c_wait); | |
446 | ||
f7578496 | 447 | cpm->irq = irq_of_parse_and_map(ofdev->dev.of_node, 0); |
b865a4e7 | 448 | if (!cpm->irq) |
61045dbe JF |
449 | return -EINVAL; |
450 | ||
451 | /* Install interrupt handler. */ | |
452 | ret = request_irq(cpm->irq, cpm_i2c_interrupt, 0, "cpm_i2c", | |
453 | &cpm->adap); | |
454 | if (ret) | |
455 | return ret; | |
456 | ||
457 | /* I2C parameter RAM */ | |
61c7a080 | 458 | i2c_base = of_iomap(ofdev->dev.of_node, 1); |
61045dbe JF |
459 | if (i2c_base == NULL) { |
460 | ret = -EINVAL; | |
461 | goto out_irq; | |
462 | } | |
463 | ||
61c7a080 | 464 | if (of_device_is_compatible(ofdev->dev.of_node, "fsl,cpm1-i2c")) { |
61045dbe JF |
465 | |
466 | /* Check for and use a microcode relocation patch. */ | |
467 | cpm->i2c_ram = i2c_base; | |
468 | cpm->i2c_addr = in_be16(&cpm->i2c_ram->rpbase); | |
469 | ||
470 | /* | |
471 | * Maybe should use cpm_muram_alloc instead of hardcoding | |
472 | * this in micropatch.c | |
473 | */ | |
474 | if (cpm->i2c_addr) { | |
475 | cpm->i2c_ram = cpm_muram_addr(cpm->i2c_addr); | |
476 | iounmap(i2c_base); | |
477 | } | |
478 | ||
479 | cpm->version = 1; | |
480 | ||
61c7a080 | 481 | } else if (of_device_is_compatible(ofdev->dev.of_node, "fsl,cpm2-i2c")) { |
61045dbe JF |
482 | cpm->i2c_addr = cpm_muram_alloc(sizeof(struct i2c_ram), 64); |
483 | cpm->i2c_ram = cpm_muram_addr(cpm->i2c_addr); | |
484 | out_be16(i2c_base, cpm->i2c_addr); | |
485 | iounmap(i2c_base); | |
486 | ||
487 | cpm->version = 2; | |
488 | ||
489 | } else { | |
490 | iounmap(i2c_base); | |
491 | ret = -EINVAL; | |
492 | goto out_irq; | |
493 | } | |
494 | ||
495 | /* I2C control/status registers */ | |
61c7a080 | 496 | cpm->i2c_reg = of_iomap(ofdev->dev.of_node, 0); |
61045dbe JF |
497 | if (cpm->i2c_reg == NULL) { |
498 | ret = -EINVAL; | |
499 | goto out_ram; | |
500 | } | |
501 | ||
61c7a080 | 502 | data = of_get_property(ofdev->dev.of_node, "fsl,cpm-command", &len); |
61045dbe JF |
503 | if (!data || len != 4) { |
504 | ret = -EINVAL; | |
505 | goto out_reg; | |
506 | } | |
507 | cpm->cp_command = *data; | |
508 | ||
61c7a080 | 509 | data = of_get_property(ofdev->dev.of_node, "linux,i2c-class", &len); |
61045dbe JF |
510 | if (data && len == 4) |
511 | cpm->adap.class = *data; | |
512 | ||
61c7a080 | 513 | data = of_get_property(ofdev->dev.of_node, "clock-frequency", &len); |
61045dbe JF |
514 | if (data && len == 4) |
515 | cpm->freq = *data; | |
516 | else | |
517 | cpm->freq = 60000; /* use 60kHz i2c clock by default */ | |
518 | ||
519 | /* | |
520 | * Allocate space for CPM_MAXBD transmit and receive buffer | |
521 | * descriptors in the DP ram. | |
522 | */ | |
523 | cpm->dp_addr = cpm_muram_alloc(sizeof(cbd_t) * 2 * CPM_MAXBD, 8); | |
524 | if (!cpm->dp_addr) { | |
525 | ret = -ENOMEM; | |
526 | goto out_reg; | |
527 | } | |
528 | ||
529 | cpm->tbase = cpm_muram_addr(cpm->dp_addr); | |
530 | cpm->rbase = cpm_muram_addr(cpm->dp_addr + sizeof(cbd_t) * CPM_MAXBD); | |
531 | ||
532 | /* Allocate TX and RX buffers */ | |
533 | ||
534 | tbdf = cpm->tbase; | |
535 | rbdf = cpm->rbase; | |
536 | ||
537 | for (i = 0; i < CPM_MAXBD; i++) { | |
36521c27 MW |
538 | cpm->rxbuf[i] = dma_alloc_coherent(&cpm->ofdev->dev, |
539 | CPM_MAX_READ + 1, | |
540 | &cpm->rxdma[i], GFP_KERNEL); | |
61045dbe JF |
541 | if (!cpm->rxbuf[i]) { |
542 | ret = -ENOMEM; | |
543 | goto out_muram; | |
544 | } | |
545 | out_be32(&rbdf[i].cbd_bufaddr, ((cpm->rxdma[i] + 1) & ~1)); | |
546 | ||
36521c27 | 547 | cpm->txbuf[i] = (unsigned char *)dma_alloc_coherent(&cpm->ofdev->dev, CPM_MAX_READ + 1, &cpm->txdma[i], GFP_KERNEL); |
61045dbe JF |
548 | if (!cpm->txbuf[i]) { |
549 | ret = -ENOMEM; | |
550 | goto out_muram; | |
551 | } | |
552 | out_be32(&tbdf[i].cbd_bufaddr, cpm->txdma[i]); | |
553 | } | |
554 | ||
555 | /* Initialize Tx/Rx parameters. */ | |
556 | ||
557 | cpm_reset_i2c_params(cpm); | |
558 | ||
3b270804 WS |
559 | dev_dbg(&cpm->ofdev->dev, "i2c_ram 0x%p, i2c_addr 0x%04x, freq %d\n", |
560 | cpm->i2c_ram, cpm->i2c_addr, cpm->freq); | |
61045dbe JF |
561 | dev_dbg(&cpm->ofdev->dev, "tbase 0x%04x, rbase 0x%04x\n", |
562 | (u8 __iomem *)cpm->tbase - DPRAM_BASE, | |
563 | (u8 __iomem *)cpm->rbase - DPRAM_BASE); | |
564 | ||
565 | cpm_command(cpm->cp_command, CPM_CR_INIT_TRX); | |
566 | ||
567 | /* | |
568 | * Select an invalid address. Just make sure we don't use loopback mode | |
569 | */ | |
570 | out_8(&cpm->i2c_reg->i2add, 0x7f << 1); | |
571 | ||
572 | /* | |
573 | * PDIV is set to 00 in i2mod, so brgclk/32 is used as input to the | |
574 | * i2c baud rate generator. This is divided by 2 x (DIV + 3) to get | |
575 | * the actual i2c bus frequency. | |
576 | */ | |
577 | brg = get_brgfreq() / (32 * 2 * cpm->freq) - 3; | |
578 | out_8(&cpm->i2c_reg->i2brg, brg); | |
579 | ||
580 | out_8(&cpm->i2c_reg->i2mod, 0x00); | |
581 | out_8(&cpm->i2c_reg->i2com, I2COM_MASTER); /* Master mode */ | |
582 | ||
583 | /* Disable interrupts. */ | |
584 | out_8(&cpm->i2c_reg->i2cmr, 0); | |
585 | out_8(&cpm->i2c_reg->i2cer, 0xff); | |
586 | ||
587 | return 0; | |
588 | ||
589 | out_muram: | |
590 | for (i = 0; i < CPM_MAXBD; i++) { | |
591 | if (cpm->rxbuf[i]) | |
36521c27 | 592 | dma_free_coherent(&cpm->ofdev->dev, CPM_MAX_READ + 1, |
61045dbe JF |
593 | cpm->rxbuf[i], cpm->rxdma[i]); |
594 | if (cpm->txbuf[i]) | |
36521c27 | 595 | dma_free_coherent(&cpm->ofdev->dev, CPM_MAX_READ + 1, |
61045dbe JF |
596 | cpm->txbuf[i], cpm->txdma[i]); |
597 | } | |
598 | cpm_muram_free(cpm->dp_addr); | |
599 | out_reg: | |
600 | iounmap(cpm->i2c_reg); | |
601 | out_ram: | |
602 | if ((cpm->version == 1) && (!cpm->i2c_addr)) | |
603 | iounmap(cpm->i2c_ram); | |
604 | if (cpm->version == 2) | |
605 | cpm_muram_free(cpm->i2c_addr); | |
606 | out_irq: | |
607 | free_irq(cpm->irq, &cpm->adap); | |
608 | return ret; | |
609 | } | |
610 | ||
611 | static void cpm_i2c_shutdown(struct cpm_i2c *cpm) | |
612 | { | |
613 | int i; | |
614 | ||
615 | /* Shut down I2C. */ | |
616 | clrbits8(&cpm->i2c_reg->i2mod, I2MOD_EN); | |
617 | ||
618 | /* Disable interrupts */ | |
619 | out_8(&cpm->i2c_reg->i2cmr, 0); | |
620 | out_8(&cpm->i2c_reg->i2cer, 0xff); | |
621 | ||
622 | free_irq(cpm->irq, &cpm->adap); | |
623 | ||
624 | /* Free all memory */ | |
625 | for (i = 0; i < CPM_MAXBD; i++) { | |
36521c27 | 626 | dma_free_coherent(&cpm->ofdev->dev, CPM_MAX_READ + 1, |
61045dbe | 627 | cpm->rxbuf[i], cpm->rxdma[i]); |
36521c27 | 628 | dma_free_coherent(&cpm->ofdev->dev, CPM_MAX_READ + 1, |
61045dbe JF |
629 | cpm->txbuf[i], cpm->txdma[i]); |
630 | } | |
631 | ||
632 | cpm_muram_free(cpm->dp_addr); | |
633 | iounmap(cpm->i2c_reg); | |
634 | ||
635 | if ((cpm->version == 1) && (!cpm->i2c_addr)) | |
636 | iounmap(cpm->i2c_ram); | |
637 | if (cpm->version == 2) | |
638 | cpm_muram_free(cpm->i2c_addr); | |
639 | } | |
640 | ||
0b255e92 | 641 | static int cpm_i2c_probe(struct platform_device *ofdev) |
61045dbe JF |
642 | { |
643 | int result, len; | |
644 | struct cpm_i2c *cpm; | |
645 | const u32 *data; | |
646 | ||
647 | cpm = kzalloc(sizeof(struct cpm_i2c), GFP_KERNEL); | |
648 | if (!cpm) | |
649 | return -ENOMEM; | |
650 | ||
651 | cpm->ofdev = ofdev; | |
652 | ||
c2c64954 | 653 | platform_set_drvdata(ofdev, cpm); |
61045dbe JF |
654 | |
655 | cpm->adap = cpm_ops; | |
656 | i2c_set_adapdata(&cpm->adap, cpm); | |
657 | cpm->adap.dev.parent = &ofdev->dev; | |
9fd04992 | 658 | cpm->adap.dev.of_node = of_node_get(ofdev->dev.of_node); |
61045dbe JF |
659 | |
660 | result = cpm_i2c_setup(cpm); | |
661 | if (result) { | |
662 | dev_err(&ofdev->dev, "Unable to init hardware\n"); | |
663 | goto out_free; | |
664 | } | |
665 | ||
666 | /* register new adapter to i2c module... */ | |
667 | ||
61c7a080 | 668 | data = of_get_property(ofdev->dev.of_node, "linux,i2c-index", &len); |
488bf314 GL |
669 | cpm->adap.nr = (data && len == 4) ? be32_to_cpup(data) : -1; |
670 | result = i2c_add_numbered_adapter(&cpm->adap); | |
61045dbe JF |
671 | |
672 | if (result < 0) { | |
673 | dev_err(&ofdev->dev, "Unable to register with I2C\n"); | |
674 | goto out_shut; | |
675 | } | |
676 | ||
677 | dev_dbg(&ofdev->dev, "hw routines for %s registered.\n", | |
678 | cpm->adap.name); | |
679 | ||
61045dbe JF |
680 | return 0; |
681 | out_shut: | |
682 | cpm_i2c_shutdown(cpm); | |
683 | out_free: | |
61045dbe JF |
684 | kfree(cpm); |
685 | ||
686 | return result; | |
687 | } | |
688 | ||
0b255e92 | 689 | static int cpm_i2c_remove(struct platform_device *ofdev) |
61045dbe | 690 | { |
c2c64954 | 691 | struct cpm_i2c *cpm = platform_get_drvdata(ofdev); |
61045dbe JF |
692 | |
693 | i2c_del_adapter(&cpm->adap); | |
694 | ||
695 | cpm_i2c_shutdown(cpm); | |
696 | ||
61045dbe JF |
697 | kfree(cpm); |
698 | ||
699 | return 0; | |
700 | } | |
701 | ||
702 | static const struct of_device_id cpm_i2c_match[] = { | |
703 | { | |
704 | .compatible = "fsl,cpm1-i2c", | |
705 | }, | |
706 | { | |
707 | .compatible = "fsl,cpm2-i2c", | |
708 | }, | |
709 | {}, | |
710 | }; | |
711 | ||
712 | MODULE_DEVICE_TABLE(of, cpm_i2c_match); | |
713 | ||
1c48a5c9 | 714 | static struct platform_driver cpm_i2c_driver = { |
61045dbe | 715 | .probe = cpm_i2c_probe, |
0b255e92 | 716 | .remove = cpm_i2c_remove, |
4018294b GL |
717 | .driver = { |
718 | .name = "fsl-i2c-cpm", | |
4018294b GL |
719 | .of_match_table = cpm_i2c_match, |
720 | }, | |
61045dbe JF |
721 | }; |
722 | ||
a3664b51 | 723 | module_platform_driver(cpm_i2c_driver); |
61045dbe JF |
724 | |
725 | MODULE_AUTHOR("Jochen Friedrich <jochen@scram.de>"); | |
726 | MODULE_DESCRIPTION("I2C-Bus adapter routines for CPM boards"); | |
727 | MODULE_LICENSE("GPL"); |