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Darius Augulisaa11e382009-01-30 10:32:28 +02001/*
2 * Copyright (C) 2002 Motorola GSG-China
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
17 * USA.
18 *
19 * Author:
20 * Darius Augulis, Teltonika Inc.
21 *
22 * Desc.:
23 * Implementation of I2C Adapter/Algorithm Driver
24 * for I2C Bus integrated in Freescale i.MX/MXC processors
25 *
26 * Derived from Motorola GSG China I2C example driver
27 *
28 * Copyright (C) 2005 Torsten Koschorrek <koschorrek at synertronixx.de
29 * Copyright (C) 2005 Matthias Blaschke <blaschke at synertronixx.de
30 * Copyright (C) 2007 RightHand Technologies, Inc.
31 * Copyright (C) 2008 Darius Augulis <darius.augulis at teltonika.lt>
32 *
Jingchang Lud533f042013-08-07 17:05:36 +080033 * Copyright 2013 Freescale Semiconductor, Inc.
34 *
Darius Augulisaa11e382009-01-30 10:32:28 +020035 */
36
37/** Includes *******************************************************************
38*******************************************************************************/
39
40#include <linux/init.h>
41#include <linux/kernel.h>
42#include <linux/module.h>
43#include <linux/errno.h>
44#include <linux/err.h>
45#include <linux/interrupt.h>
46#include <linux/delay.h>
47#include <linux/i2c.h>
48#include <linux/io.h>
49#include <linux/sched.h>
50#include <linux/platform_device.h>
51#include <linux/clk.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090052#include <linux/slab.h>
Shawn Guodfcd04b2011-09-08 15:09:35 +080053#include <linux/of.h>
54#include <linux/of_device.h>
55#include <linux/of_i2c.h>
Arnd Bergmann82906b12012-08-24 15:14:29 +020056#include <linux/platform_data/i2c-imx.h>
Darius Augulisaa11e382009-01-30 10:32:28 +020057
58/** Defines ********************************************************************
59*******************************************************************************/
60
61/* This will be the driver name the kernel reports */
62#define DRIVER_NAME "imx-i2c"
63
64/* Default value */
65#define IMX_I2C_BIT_RATE 100000 /* 100kHz */
66
67/* IMX I2C registers */
68#define IMX_I2C_IADR 0x00 /* i2c slave address */
69#define IMX_I2C_IFDR 0x04 /* i2c frequency divider */
70#define IMX_I2C_I2CR 0x08 /* i2c control */
71#define IMX_I2C_I2SR 0x0C /* i2c status */
72#define IMX_I2C_I2DR 0x10 /* i2c transfer data */
73
74/* Bits of IMX I2C registers */
75#define I2SR_RXAK 0x01
76#define I2SR_IIF 0x02
77#define I2SR_SRW 0x04
78#define I2SR_IAL 0x10
79#define I2SR_IBB 0x20
80#define I2SR_IAAS 0x40
81#define I2SR_ICF 0x80
82#define I2CR_RSTA 0x04
83#define I2CR_TXAK 0x08
84#define I2CR_MTX 0x10
85#define I2CR_MSTA 0x20
86#define I2CR_IIEN 0x40
87#define I2CR_IEN 0x80
88
89/** Variables ******************************************************************
90*******************************************************************************/
91
Darius Augulisaa11e382009-01-30 10:32:28 +020092/*
93 * sorted list of clock divider, register value pairs
94 * taken from table 26-5, p.26-9, Freescale i.MX
95 * Integrated Portable System Processor Reference Manual
96 * Document Number: MC9328MXLRM, Rev. 5.1, 06/2007
97 *
98 * Duplicated divider values removed from list
99 */
Jingchang Lud533f042013-08-07 17:05:36 +0800100struct imx_i2c_clk_pair {
101 u16 div;
102 u16 val;
103};
Darius Augulisaa11e382009-01-30 10:32:28 +0200104
Jingchang Lud533f042013-08-07 17:05:36 +0800105static struct imx_i2c_clk_pair __initdata i2c_clk_div[] = {
Darius Augulisaa11e382009-01-30 10:32:28 +0200106 { 22, 0x20 }, { 24, 0x21 }, { 26, 0x22 }, { 28, 0x23 },
107 { 30, 0x00 }, { 32, 0x24 }, { 36, 0x25 }, { 40, 0x26 },
108 { 42, 0x03 }, { 44, 0x27 }, { 48, 0x28 }, { 52, 0x05 },
109 { 56, 0x29 }, { 60, 0x06 }, { 64, 0x2A }, { 72, 0x2B },
110 { 80, 0x2C }, { 88, 0x09 }, { 96, 0x2D }, { 104, 0x0A },
111 { 112, 0x2E }, { 128, 0x2F }, { 144, 0x0C }, { 160, 0x30 },
112 { 192, 0x31 }, { 224, 0x32 }, { 240, 0x0F }, { 256, 0x33 },
113 { 288, 0x10 }, { 320, 0x34 }, { 384, 0x35 }, { 448, 0x36 },
114 { 480, 0x13 }, { 512, 0x37 }, { 576, 0x14 }, { 640, 0x38 },
115 { 768, 0x39 }, { 896, 0x3A }, { 960, 0x17 }, { 1024, 0x3B },
116 { 1152, 0x18 }, { 1280, 0x3C }, { 1536, 0x3D }, { 1792, 0x3E },
117 { 1920, 0x1B }, { 2048, 0x3F }, { 2304, 0x1C }, { 2560, 0x1D },
118 { 3072, 0x1E }, { 3840, 0x1F }
119};
120
Shawn Guo5bdfba22012-09-14 15:19:00 +0800121enum imx_i2c_type {
122 IMX1_I2C,
123 IMX21_I2C,
124};
125
Darius Augulisaa11e382009-01-30 10:32:28 +0200126struct imx_i2c_struct {
127 struct i2c_adapter adapter;
Darius Augulisaa11e382009-01-30 10:32:28 +0200128 struct clk *clk;
129 void __iomem *base;
Darius Augulisaa11e382009-01-30 10:32:28 +0200130 wait_queue_head_t queue;
131 unsigned long i2csr;
Wolfram Sang65de3942009-04-06 16:27:45 +0200132 unsigned int disable_delay;
Richard Zhao43309f32009-10-17 17:46:22 +0800133 int stopped;
Richard Zhaodb3a3d42009-10-17 17:46:24 +0800134 unsigned int ifdr; /* IMX_I2C_IFDR */
Shawn Guo5bdfba22012-09-14 15:19:00 +0800135 enum imx_i2c_type devtype;
Darius Augulisaa11e382009-01-30 10:32:28 +0200136};
137
Shawn Guo5bdfba22012-09-14 15:19:00 +0800138static struct platform_device_id imx_i2c_devtype[] = {
139 {
140 .name = "imx1-i2c",
141 .driver_data = IMX1_I2C,
142 }, {
143 .name = "imx21-i2c",
144 .driver_data = IMX21_I2C,
145 }, {
146 /* sentinel */
147 }
148};
149MODULE_DEVICE_TABLE(platform, imx_i2c_devtype);
150
Shawn Guodfcd04b2011-09-08 15:09:35 +0800151static const struct of_device_id i2c_imx_dt_ids[] = {
Shawn Guo5bdfba22012-09-14 15:19:00 +0800152 { .compatible = "fsl,imx1-i2c", .data = &imx_i2c_devtype[IMX1_I2C], },
153 { .compatible = "fsl,imx21-i2c", .data = &imx_i2c_devtype[IMX21_I2C], },
Shawn Guodfcd04b2011-09-08 15:09:35 +0800154 { /* sentinel */ }
155};
Arnaud Patard \(Rtp\)2f641a82013-06-20 23:07:06 +0200156MODULE_DEVICE_TABLE(of, i2c_imx_dt_ids);
Shawn Guodfcd04b2011-09-08 15:09:35 +0800157
Shawn Guo5bdfba22012-09-14 15:19:00 +0800158static inline int is_imx1_i2c(struct imx_i2c_struct *i2c_imx)
159{
160 return i2c_imx->devtype == IMX1_I2C;
161}
162
Darius Augulisaa11e382009-01-30 10:32:28 +0200163/** Functions for IMX I2C adapter driver ***************************************
164*******************************************************************************/
165
Richard Zhao43309f32009-10-17 17:46:22 +0800166static int i2c_imx_bus_busy(struct imx_i2c_struct *i2c_imx, int for_busy)
Darius Augulisaa11e382009-01-30 10:32:28 +0200167{
168 unsigned long orig_jiffies = jiffies;
Richard Zhao43309f32009-10-17 17:46:22 +0800169 unsigned int temp;
Darius Augulisaa11e382009-01-30 10:32:28 +0200170
171 dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
172
Richard Zhao43309f32009-10-17 17:46:22 +0800173 while (1) {
174 temp = readb(i2c_imx->base + IMX_I2C_I2SR);
175 if (for_busy && (temp & I2SR_IBB))
176 break;
177 if (!for_busy && !(temp & I2SR_IBB))
178 break;
Arnaud Patardda9c99f2010-03-23 17:28:28 +0100179 if (time_after(jiffies, orig_jiffies + msecs_to_jiffies(500))) {
Darius Augulisaa11e382009-01-30 10:32:28 +0200180 dev_dbg(&i2c_imx->adapter.dev,
181 "<%s> I2C bus is busy\n", __func__);
Arnaud Patardda9c99f2010-03-23 17:28:28 +0100182 return -ETIMEDOUT;
Darius Augulisaa11e382009-01-30 10:32:28 +0200183 }
184 schedule();
185 }
186
187 return 0;
188}
189
190static int i2c_imx_trx_complete(struct imx_i2c_struct *i2c_imx)
191{
Marc Kleine-Buddee39428d2010-06-21 09:27:05 +0200192 wait_event_timeout(i2c_imx->queue, i2c_imx->i2csr & I2SR_IIF, HZ / 10);
Darius Augulisaa11e382009-01-30 10:32:28 +0200193
Marc Kleine-Buddee39428d2010-06-21 09:27:05 +0200194 if (unlikely(!(i2c_imx->i2csr & I2SR_IIF))) {
Darius Augulisaa11e382009-01-30 10:32:28 +0200195 dev_dbg(&i2c_imx->adapter.dev, "<%s> Timeout\n", __func__);
196 return -ETIMEDOUT;
197 }
198 dev_dbg(&i2c_imx->adapter.dev, "<%s> TRX complete\n", __func__);
199 i2c_imx->i2csr = 0;
200 return 0;
201}
202
203static int i2c_imx_acked(struct imx_i2c_struct *i2c_imx)
204{
205 if (readb(i2c_imx->base + IMX_I2C_I2SR) & I2SR_RXAK) {
206 dev_dbg(&i2c_imx->adapter.dev, "<%s> No ACK\n", __func__);
207 return -EIO; /* No ACK */
208 }
209
210 dev_dbg(&i2c_imx->adapter.dev, "<%s> ACK received\n", __func__);
211 return 0;
212}
213
Richard Zhao43309f32009-10-17 17:46:22 +0800214static int i2c_imx_start(struct imx_i2c_struct *i2c_imx)
Darius Augulisaa11e382009-01-30 10:32:28 +0200215{
216 unsigned int temp = 0;
Richard Zhao43309f32009-10-17 17:46:22 +0800217 int result;
Darius Augulisaa11e382009-01-30 10:32:28 +0200218
219 dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
220
Richard Zhao83914332011-11-15 14:48:08 +0800221 clk_prepare_enable(i2c_imx->clk);
Richard Zhaodb3a3d42009-10-17 17:46:24 +0800222 writeb(i2c_imx->ifdr, i2c_imx->base + IMX_I2C_IFDR);
Darius Augulisaa11e382009-01-30 10:32:28 +0200223 /* Enable I2C controller */
Richard Zhao43309f32009-10-17 17:46:22 +0800224 writeb(0, i2c_imx->base + IMX_I2C_I2SR);
Darius Augulisaa11e382009-01-30 10:32:28 +0200225 writeb(I2CR_IEN, i2c_imx->base + IMX_I2C_I2CR);
Richard Zhao43309f32009-10-17 17:46:22 +0800226
227 /* Wait controller to be stable */
228 udelay(50);
229
Darius Augulisaa11e382009-01-30 10:32:28 +0200230 /* Start I2C transaction */
231 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
232 temp |= I2CR_MSTA;
233 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
Richard Zhao43309f32009-10-17 17:46:22 +0800234 result = i2c_imx_bus_busy(i2c_imx, 1);
235 if (result)
236 return result;
237 i2c_imx->stopped = 0;
238
Darius Augulisaa11e382009-01-30 10:32:28 +0200239 temp |= I2CR_IIEN | I2CR_MTX | I2CR_TXAK;
240 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
Richard Zhao43309f32009-10-17 17:46:22 +0800241 return result;
Darius Augulisaa11e382009-01-30 10:32:28 +0200242}
243
244static void i2c_imx_stop(struct imx_i2c_struct *i2c_imx)
245{
246 unsigned int temp = 0;
247
Richard Zhao43309f32009-10-17 17:46:22 +0800248 if (!i2c_imx->stopped) {
249 /* Stop I2C transaction */
250 dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
251 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
252 temp &= ~(I2CR_MSTA | I2CR_MTX);
253 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
Richard Zhao43309f32009-10-17 17:46:22 +0800254 }
Shawn Guo5bdfba22012-09-14 15:19:00 +0800255 if (is_imx1_i2c(i2c_imx)) {
Richard Zhaoa4094a72009-10-17 17:46:23 +0800256 /*
257 * This delay caused by an i.MXL hardware bug.
258 * If no (or too short) delay, no "STOP" bit will be generated.
259 */
260 udelay(i2c_imx->disable_delay);
261 }
Richard Zhao43309f32009-10-17 17:46:22 +0800262
Valentin Longchampa1ee06b2010-01-21 18:55:32 +0100263 if (!i2c_imx->stopped) {
Richard Zhao43309f32009-10-17 17:46:22 +0800264 i2c_imx_bus_busy(i2c_imx, 0);
Valentin Longchampa1ee06b2010-01-21 18:55:32 +0100265 i2c_imx->stopped = 1;
266 }
Richard Zhao43309f32009-10-17 17:46:22 +0800267
Darius Augulisaa11e382009-01-30 10:32:28 +0200268 /* Disable I2C controller */
269 writeb(0, i2c_imx->base + IMX_I2C_I2CR);
Richard Zhao83914332011-11-15 14:48:08 +0800270 clk_disable_unprepare(i2c_imx->clk);
Darius Augulisaa11e382009-01-30 10:32:28 +0200271}
272
273static void __init i2c_imx_set_clk(struct imx_i2c_struct *i2c_imx,
274 unsigned int rate)
275{
276 unsigned int i2c_clk_rate;
277 unsigned int div;
278 int i;
279
280 /* Divider value calculation */
281 i2c_clk_rate = clk_get_rate(i2c_imx->clk);
282 div = (i2c_clk_rate + rate - 1) / rate;
Jingchang Lud533f042013-08-07 17:05:36 +0800283 if (div < i2c_clk_div[0].div)
Darius Augulisaa11e382009-01-30 10:32:28 +0200284 i = 0;
Jingchang Lud533f042013-08-07 17:05:36 +0800285 else if (div > i2c_clk_div[ARRAY_SIZE(i2c_clk_div) - 1].div)
Darius Augulisaa11e382009-01-30 10:32:28 +0200286 i = ARRAY_SIZE(i2c_clk_div) - 1;
287 else
Jingchang Lud533f042013-08-07 17:05:36 +0800288 for (i = 0; i2c_clk_div[i].div < div; i++);
Darius Augulisaa11e382009-01-30 10:32:28 +0200289
Richard Zhaodb3a3d42009-10-17 17:46:24 +0800290 /* Store divider value */
Jingchang Lud533f042013-08-07 17:05:36 +0800291 i2c_imx->ifdr = i2c_clk_div[i].val;
Darius Augulisaa11e382009-01-30 10:32:28 +0200292
293 /*
294 * There dummy delay is calculated.
295 * It should be about one I2C clock period long.
296 * This delay is used in I2C bus disable function
297 * to fix chip hardware bug.
298 */
Jingchang Lud533f042013-08-07 17:05:36 +0800299 i2c_imx->disable_delay = (500000U * i2c_clk_div[i].div
Darius Augulisaa11e382009-01-30 10:32:28 +0200300 + (i2c_clk_rate / 2) - 1) / (i2c_clk_rate / 2);
301
302 /* dev_dbg() can't be used, because adapter is not yet registered */
303#ifdef CONFIG_I2C_DEBUG_BUS
Fabio Estevam002f0022012-08-01 17:38:15 -0300304 dev_dbg(&i2c_imx->adapter.dev, "<%s> I2C_CLK=%d, REQ DIV=%d\n",
Darius Augulisaa11e382009-01-30 10:32:28 +0200305 __func__, i2c_clk_rate, div);
Fabio Estevam002f0022012-08-01 17:38:15 -0300306 dev_dbg(&i2c_imx->adapter.dev, "<%s> IFDR[IC]=0x%x, REAL DIV=%d\n",
Jingchang Lud533f042013-08-07 17:05:36 +0800307 __func__, i2c_clk_div[i].val, i2c_clk_div[i].div);
Darius Augulisaa11e382009-01-30 10:32:28 +0200308#endif
309}
310
311static irqreturn_t i2c_imx_isr(int irq, void *dev_id)
312{
313 struct imx_i2c_struct *i2c_imx = dev_id;
314 unsigned int temp;
315
316 temp = readb(i2c_imx->base + IMX_I2C_I2SR);
317 if (temp & I2SR_IIF) {
318 /* save status register */
319 i2c_imx->i2csr = temp;
320 temp &= ~I2SR_IIF;
321 writeb(temp, i2c_imx->base + IMX_I2C_I2SR);
Marc Kleine-Buddee39428d2010-06-21 09:27:05 +0200322 wake_up(&i2c_imx->queue);
Darius Augulisaa11e382009-01-30 10:32:28 +0200323 return IRQ_HANDLED;
324 }
325
326 return IRQ_NONE;
327}
328
329static int i2c_imx_write(struct imx_i2c_struct *i2c_imx, struct i2c_msg *msgs)
330{
331 int i, result;
332
333 dev_dbg(&i2c_imx->adapter.dev, "<%s> write slave address: addr=0x%x\n",
334 __func__, msgs->addr << 1);
335
336 /* write slave address */
337 writeb(msgs->addr << 1, i2c_imx->base + IMX_I2C_I2DR);
338 result = i2c_imx_trx_complete(i2c_imx);
339 if (result)
340 return result;
341 result = i2c_imx_acked(i2c_imx);
342 if (result)
343 return result;
344 dev_dbg(&i2c_imx->adapter.dev, "<%s> write data\n", __func__);
345
346 /* write data */
347 for (i = 0; i < msgs->len; i++) {
348 dev_dbg(&i2c_imx->adapter.dev,
349 "<%s> write byte: B%d=0x%X\n",
350 __func__, i, msgs->buf[i]);
351 writeb(msgs->buf[i], i2c_imx->base + IMX_I2C_I2DR);
352 result = i2c_imx_trx_complete(i2c_imx);
353 if (result)
354 return result;
355 result = i2c_imx_acked(i2c_imx);
356 if (result)
357 return result;
358 }
359 return 0;
360}
361
362static int i2c_imx_read(struct imx_i2c_struct *i2c_imx, struct i2c_msg *msgs)
363{
364 int i, result;
365 unsigned int temp;
366
367 dev_dbg(&i2c_imx->adapter.dev,
368 "<%s> write slave address: addr=0x%x\n",
369 __func__, (msgs->addr << 1) | 0x01);
370
371 /* write slave address */
372 writeb((msgs->addr << 1) | 0x01, i2c_imx->base + IMX_I2C_I2DR);
373 result = i2c_imx_trx_complete(i2c_imx);
374 if (result)
375 return result;
376 result = i2c_imx_acked(i2c_imx);
377 if (result)
378 return result;
379
380 dev_dbg(&i2c_imx->adapter.dev, "<%s> setup bus\n", __func__);
381
382 /* setup bus to read data */
383 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
384 temp &= ~I2CR_MTX;
385 if (msgs->len - 1)
386 temp &= ~I2CR_TXAK;
387 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
388 readb(i2c_imx->base + IMX_I2C_I2DR); /* dummy read */
389
390 dev_dbg(&i2c_imx->adapter.dev, "<%s> read data\n", __func__);
391
392 /* read data */
393 for (i = 0; i < msgs->len; i++) {
394 result = i2c_imx_trx_complete(i2c_imx);
395 if (result)
396 return result;
397 if (i == (msgs->len - 1)) {
Richard Zhao43309f32009-10-17 17:46:22 +0800398 /* It must generate STOP before read I2DR to prevent
399 controller from generating another clock cycle */
Darius Augulisaa11e382009-01-30 10:32:28 +0200400 dev_dbg(&i2c_imx->adapter.dev,
401 "<%s> clear MSTA\n", __func__);
402 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
Richard Zhao43309f32009-10-17 17:46:22 +0800403 temp &= ~(I2CR_MSTA | I2CR_MTX);
Darius Augulisaa11e382009-01-30 10:32:28 +0200404 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
Richard Zhao43309f32009-10-17 17:46:22 +0800405 i2c_imx_bus_busy(i2c_imx, 0);
406 i2c_imx->stopped = 1;
Darius Augulisaa11e382009-01-30 10:32:28 +0200407 } else if (i == (msgs->len - 2)) {
408 dev_dbg(&i2c_imx->adapter.dev,
409 "<%s> set TXAK\n", __func__);
410 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
411 temp |= I2CR_TXAK;
412 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
413 }
414 msgs->buf[i] = readb(i2c_imx->base + IMX_I2C_I2DR);
415 dev_dbg(&i2c_imx->adapter.dev,
416 "<%s> read byte: B%d=0x%X\n",
417 __func__, i, msgs->buf[i]);
418 }
419 return 0;
420}
421
422static int i2c_imx_xfer(struct i2c_adapter *adapter,
423 struct i2c_msg *msgs, int num)
424{
425 unsigned int i, temp;
426 int result;
427 struct imx_i2c_struct *i2c_imx = i2c_get_adapdata(adapter);
428
429 dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
430
Richard Zhao43309f32009-10-17 17:46:22 +0800431 /* Start I2C transfer */
432 result = i2c_imx_start(i2c_imx);
Darius Augulisaa11e382009-01-30 10:32:28 +0200433 if (result)
434 goto fail0;
435
Darius Augulisaa11e382009-01-30 10:32:28 +0200436 /* read/write data */
437 for (i = 0; i < num; i++) {
438 if (i) {
439 dev_dbg(&i2c_imx->adapter.dev,
440 "<%s> repeated start\n", __func__);
441 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
442 temp |= I2CR_RSTA;
443 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
Richard Zhao43309f32009-10-17 17:46:22 +0800444 result = i2c_imx_bus_busy(i2c_imx, 1);
445 if (result)
446 goto fail0;
Darius Augulisaa11e382009-01-30 10:32:28 +0200447 }
448 dev_dbg(&i2c_imx->adapter.dev,
449 "<%s> transfer message: %d\n", __func__, i);
450 /* write/read data */
451#ifdef CONFIG_I2C_DEBUG_BUS
452 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
453 dev_dbg(&i2c_imx->adapter.dev, "<%s> CONTROL: IEN=%d, IIEN=%d, "
454 "MSTA=%d, MTX=%d, TXAK=%d, RSTA=%d\n", __func__,
455 (temp & I2CR_IEN ? 1 : 0), (temp & I2CR_IIEN ? 1 : 0),
456 (temp & I2CR_MSTA ? 1 : 0), (temp & I2CR_MTX ? 1 : 0),
457 (temp & I2CR_TXAK ? 1 : 0), (temp & I2CR_RSTA ? 1 : 0));
458 temp = readb(i2c_imx->base + IMX_I2C_I2SR);
459 dev_dbg(&i2c_imx->adapter.dev,
460 "<%s> STATUS: ICF=%d, IAAS=%d, IBB=%d, "
461 "IAL=%d, SRW=%d, IIF=%d, RXAK=%d\n", __func__,
462 (temp & I2SR_ICF ? 1 : 0), (temp & I2SR_IAAS ? 1 : 0),
463 (temp & I2SR_IBB ? 1 : 0), (temp & I2SR_IAL ? 1 : 0),
464 (temp & I2SR_SRW ? 1 : 0), (temp & I2SR_IIF ? 1 : 0),
465 (temp & I2SR_RXAK ? 1 : 0));
466#endif
467 if (msgs[i].flags & I2C_M_RD)
468 result = i2c_imx_read(i2c_imx, &msgs[i]);
469 else
470 result = i2c_imx_write(i2c_imx, &msgs[i]);
Arnaud Patardda9c99f2010-03-23 17:28:28 +0100471 if (result)
472 goto fail0;
Darius Augulisaa11e382009-01-30 10:32:28 +0200473 }
474
475fail0:
476 /* Stop I2C transfer */
477 i2c_imx_stop(i2c_imx);
478
479 dev_dbg(&i2c_imx->adapter.dev, "<%s> exit with: %s: %d\n", __func__,
480 (result < 0) ? "error" : "success msg",
481 (result < 0) ? result : num);
482 return (result < 0) ? result : num;
483}
484
485static u32 i2c_imx_func(struct i2c_adapter *adapter)
486{
487 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
488}
489
490static struct i2c_algorithm i2c_imx_algo = {
491 .master_xfer = i2c_imx_xfer,
492 .functionality = i2c_imx_func,
493};
494
495static int __init i2c_imx_probe(struct platform_device *pdev)
496{
Shawn Guo5bdfba22012-09-14 15:19:00 +0800497 const struct of_device_id *of_id = of_match_device(i2c_imx_dt_ids,
498 &pdev->dev);
Darius Augulisaa11e382009-01-30 10:32:28 +0200499 struct imx_i2c_struct *i2c_imx;
500 struct resource *res;
Shawn Guo593702c2011-09-08 15:09:34 +0800501 struct imxi2c_platform_data *pdata = pdev->dev.platform_data;
Darius Augulisaa11e382009-01-30 10:32:28 +0200502 void __iomem *base;
Wolfram Sang8c88ab02012-07-08 13:11:43 +0200503 int irq, ret;
504 u32 bitrate;
Darius Augulisaa11e382009-01-30 10:32:28 +0200505
506 dev_dbg(&pdev->dev, "<%s>\n", __func__);
507
Darius Augulisaa11e382009-01-30 10:32:28 +0200508 irq = platform_get_irq(pdev, 0);
509 if (irq < 0) {
510 dev_err(&pdev->dev, "can't get irq number\n");
511 return -ENOENT;
512 }
513
Wolfram Sang3cc2d002013-05-10 10:16:54 +0200514 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
Thierry Reding84dbf802013-01-21 11:09:03 +0100515 base = devm_ioremap_resource(&pdev->dev, res);
516 if (IS_ERR(base))
517 return PTR_ERR(base);
Uwe Kleine-König4927fbf2010-01-08 17:23:17 +0100518
Richard Zhao9f8a3e72012-06-04 19:04:25 +0800519 i2c_imx = devm_kzalloc(&pdev->dev, sizeof(struct imx_i2c_struct),
520 GFP_KERNEL);
Darius Augulisaa11e382009-01-30 10:32:28 +0200521 if (!i2c_imx) {
522 dev_err(&pdev->dev, "can't allocate interface\n");
Richard Zhao9f8a3e72012-06-04 19:04:25 +0800523 return -ENOMEM;
Darius Augulis309c18d2009-03-31 14:52:54 +0300524 }
525
Shawn Guo5bdfba22012-09-14 15:19:00 +0800526 if (of_id)
527 pdev->id_entry = of_id->data;
528 i2c_imx->devtype = pdev->id_entry->driver_data;
529
Darius Augulisaa11e382009-01-30 10:32:28 +0200530 /* Setup i2c_imx driver structure */
Wolfram Sang973c5ed2012-04-19 17:31:01 +0200531 strlcpy(i2c_imx->adapter.name, pdev->name, sizeof(i2c_imx->adapter.name));
Darius Augulisaa11e382009-01-30 10:32:28 +0200532 i2c_imx->adapter.owner = THIS_MODULE;
533 i2c_imx->adapter.algo = &i2c_imx_algo;
534 i2c_imx->adapter.dev.parent = &pdev->dev;
535 i2c_imx->adapter.nr = pdev->id;
Shawn Guodfcd04b2011-09-08 15:09:35 +0800536 i2c_imx->adapter.dev.of_node = pdev->dev.of_node;
Darius Augulisaa11e382009-01-30 10:32:28 +0200537 i2c_imx->base = base;
Darius Augulisaa11e382009-01-30 10:32:28 +0200538
539 /* Get I2C clock */
Fabio Estevam1f09c672012-07-06 15:31:32 -0300540 i2c_imx->clk = devm_clk_get(&pdev->dev, NULL);
Darius Augulisaa11e382009-01-30 10:32:28 +0200541 if (IS_ERR(i2c_imx->clk)) {
Darius Augulisaa11e382009-01-30 10:32:28 +0200542 dev_err(&pdev->dev, "can't get I2C clock\n");
Richard Zhao9f8a3e72012-06-04 19:04:25 +0800543 return PTR_ERR(i2c_imx->clk);
Darius Augulisaa11e382009-01-30 10:32:28 +0200544 }
Darius Augulisaa11e382009-01-30 10:32:28 +0200545
Jingchang Lu46f28322013-08-07 17:05:37 +0800546 ret = clk_prepare_enable(i2c_imx->clk);
547 if (ret) {
548 dev_err(&pdev->dev, "can't enable I2C clock\n");
549 return ret;
550 }
Darius Augulisaa11e382009-01-30 10:32:28 +0200551 /* Request IRQ */
Richard Zhao9f8a3e72012-06-04 19:04:25 +0800552 ret = devm_request_irq(&pdev->dev, irq, i2c_imx_isr, 0,
553 pdev->name, i2c_imx);
Darius Augulisaa11e382009-01-30 10:32:28 +0200554 if (ret) {
Richard Zhao9f8a3e72012-06-04 19:04:25 +0800555 dev_err(&pdev->dev, "can't claim irq %d\n", irq);
556 return ret;
Darius Augulisaa11e382009-01-30 10:32:28 +0200557 }
558
559 /* Init queue */
560 init_waitqueue_head(&i2c_imx->queue);
561
562 /* Set up adapter data */
563 i2c_set_adapdata(&i2c_imx->adapter, i2c_imx);
564
565 /* Set up clock divider */
Shawn Guodfcd04b2011-09-08 15:09:35 +0800566 bitrate = IMX_I2C_BIT_RATE;
567 ret = of_property_read_u32(pdev->dev.of_node,
568 "clock-frequency", &bitrate);
569 if (ret < 0 && pdata && pdata->bitrate)
570 bitrate = pdata->bitrate;
571 i2c_imx_set_clk(i2c_imx, bitrate);
Darius Augulisaa11e382009-01-30 10:32:28 +0200572
573 /* Set up chip registers to defaults */
574 writeb(0, i2c_imx->base + IMX_I2C_I2CR);
575 writeb(0, i2c_imx->base + IMX_I2C_I2SR);
576
577 /* Add I2C adapter */
578 ret = i2c_add_numbered_adapter(&i2c_imx->adapter);
579 if (ret < 0) {
580 dev_err(&pdev->dev, "registration failed\n");
Richard Zhao9f8a3e72012-06-04 19:04:25 +0800581 return ret;
Darius Augulisaa11e382009-01-30 10:32:28 +0200582 }
583
Shawn Guodfcd04b2011-09-08 15:09:35 +0800584 of_i2c_register_devices(&i2c_imx->adapter);
585
Darius Augulisaa11e382009-01-30 10:32:28 +0200586 /* Set up platform driver data */
587 platform_set_drvdata(pdev, i2c_imx);
Jingchang Lu46f28322013-08-07 17:05:37 +0800588 clk_disable_unprepare(i2c_imx->clk);
Darius Augulisaa11e382009-01-30 10:32:28 +0200589
Richard Zhao9f8a3e72012-06-04 19:04:25 +0800590 dev_dbg(&i2c_imx->adapter.dev, "claimed irq %d\n", irq);
Darius Augulisaa11e382009-01-30 10:32:28 +0200591 dev_dbg(&i2c_imx->adapter.dev, "device resources from 0x%x to 0x%x\n",
Richard Zhao9f8a3e72012-06-04 19:04:25 +0800592 res->start, res->end);
593 dev_dbg(&i2c_imx->adapter.dev, "allocated %d bytes at 0x%x\n",
594 resource_size(res), res->start);
Darius Augulisaa11e382009-01-30 10:32:28 +0200595 dev_dbg(&i2c_imx->adapter.dev, "adapter name: \"%s\"\n",
596 i2c_imx->adapter.name);
Fabio Estevam06d141e2012-08-01 17:38:14 -0300597 dev_info(&i2c_imx->adapter.dev, "IMX I2C adapter registered\n");
Darius Augulisaa11e382009-01-30 10:32:28 +0200598
599 return 0; /* Return OK */
Darius Augulisaa11e382009-01-30 10:32:28 +0200600}
601
602static int __exit i2c_imx_remove(struct platform_device *pdev)
603{
604 struct imx_i2c_struct *i2c_imx = platform_get_drvdata(pdev);
Darius Augulisaa11e382009-01-30 10:32:28 +0200605
606 /* remove adapter */
607 dev_dbg(&i2c_imx->adapter.dev, "adapter removed\n");
608 i2c_del_adapter(&i2c_imx->adapter);
Darius Augulisaa11e382009-01-30 10:32:28 +0200609
Darius Augulisaa11e382009-01-30 10:32:28 +0200610 /* setup chip registers to defaults */
611 writeb(0, i2c_imx->base + IMX_I2C_IADR);
612 writeb(0, i2c_imx->base + IMX_I2C_IFDR);
613 writeb(0, i2c_imx->base + IMX_I2C_I2CR);
614 writeb(0, i2c_imx->base + IMX_I2C_I2SR);
615
Darius Augulisaa11e382009-01-30 10:32:28 +0200616 return 0;
617}
618
619static struct platform_driver i2c_imx_driver = {
Darius Augulisaa11e382009-01-30 10:32:28 +0200620 .remove = __exit_p(i2c_imx_remove),
621 .driver = {
622 .name = DRIVER_NAME,
623 .owner = THIS_MODULE,
Shawn Guodfcd04b2011-09-08 15:09:35 +0800624 .of_match_table = i2c_imx_dt_ids,
Shawn Guo5bdfba22012-09-14 15:19:00 +0800625 },
626 .id_table = imx_i2c_devtype,
Darius Augulisaa11e382009-01-30 10:32:28 +0200627};
628
629static int __init i2c_adap_imx_init(void)
630{
631 return platform_driver_probe(&i2c_imx_driver, i2c_imx_probe);
632}
Wolfram Sang5d3f3332009-09-19 09:09:50 +0200633subsys_initcall(i2c_adap_imx_init);
Darius Augulisaa11e382009-01-30 10:32:28 +0200634
635static void __exit i2c_adap_imx_exit(void)
636{
637 platform_driver_unregister(&i2c_imx_driver);
638}
Darius Augulisaa11e382009-01-30 10:32:28 +0200639module_exit(i2c_adap_imx_exit);
640
641MODULE_LICENSE("GPL");
642MODULE_AUTHOR("Darius Augulis");
643MODULE_DESCRIPTION("I2C adapter driver for IMX I2C bus");
644MODULE_ALIAS("platform:" DRIVER_NAME);