blob: be671f7a0e0670c98151d6829dc22e2129eeba3f [file] [log] [blame]
Russell Kingb652b432005-06-15 12:38:14 +01001/*
2 * i2c_adap_pxa.c
3 *
4 * I2C adapter for the PXA I2C bus access.
5 *
6 * Copyright (C) 2002 Intrinsyc Software Inc.
7 * Copyright (C) 2004-2005 Deep Blue Solutions Ltd.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 * History:
14 * Apr 2002: Initial version [CS]
Daniel Mack3ad2f3f2010-02-03 08:01:28 +080015 * Jun 2002: Properly separated algo/adap [FB]
Russell Kingb652b432005-06-15 12:38:14 +010016 * Jan 2003: Fixed several bugs concerning interrupt handling [Kai-Uwe Bloem]
17 * Jan 2003: added limited signal handling [Kai-Uwe Bloem]
18 * Sep 2004: Major rework to ensure efficient bus handling [RMK]
19 * Dec 2004: Added support for PXA27x and slave device probing [Liam Girdwood]
20 * Feb 2005: Rework slave mode handling [RMK]
21 */
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/i2c.h>
Russell Kingb652b432005-06-15 12:38:14 +010025#include <linux/init.h>
26#include <linux/time.h>
27#include <linux/sched.h>
28#include <linux/delay.h>
29#include <linux/errno.h>
30#include <linux/interrupt.h>
31#include <linux/i2c-pxa.h>
Haojian Zhuang63fe1222012-03-01 13:04:44 +080032#include <linux/of.h>
33#include <linux/of_device.h>
Russell Kingd052d1b2005-10-29 19:07:23 +010034#include <linux/platform_device.h>
Russell Kingc3cef3f2007-08-20 10:19:10 +010035#include <linux/err.h>
36#include <linux/clk.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090037#include <linux/slab.h>
H Hartley Sweeten21782182010-05-21 18:41:01 +020038#include <linux/io.h>
Sebastian Andrzej Siewiorb4593962011-02-23 12:38:16 +010039#include <linux/i2c/pxa-i2c.h>
Russell Kingb652b432005-06-15 12:38:14 +010040
Russell Kingb652b432005-06-15 12:38:14 +010041#include <asm/irq.h>
Eric Miao283afa02008-09-08 14:15:08 +080042
Sebastian Andrzej Siewiord6668c72011-02-23 12:38:15 +010043struct pxa_reg_layout {
44 u32 ibmr;
45 u32 idbr;
46 u32 icr;
47 u32 isr;
48 u32 isar;
49};
50
51enum pxa_i2c_types {
52 REGS_PXA2XX,
53 REGS_PXA3XX,
Sebastian Andrzej Siewior7e94dd12011-03-02 11:26:53 +010054 REGS_CE4100,
Sebastian Andrzej Siewiord6668c72011-02-23 12:38:15 +010055};
56
Eric Miao283afa02008-09-08 14:15:08 +080057/*
Sebastian Andrzej Siewiord6668c72011-02-23 12:38:15 +010058 * I2C registers definitions
Eric Miaof23d4912009-04-13 14:43:25 +080059 */
Sebastian Andrzej Siewiord6668c72011-02-23 12:38:15 +010060static struct pxa_reg_layout pxa_reg_layout[] = {
61 [REGS_PXA2XX] = {
62 .ibmr = 0x00,
Sebastian Andrzej Siewiord6668c72011-02-23 12:38:15 +010063 .idbr = 0x08,
64 .icr = 0x10,
65 .isr = 0x18,
66 .isar = 0x20,
67 },
Vasily Khoruzhick23e74a82011-03-13 15:53:28 +020068 [REGS_PXA3XX] = {
69 .ibmr = 0x00,
70 .idbr = 0x04,
71 .icr = 0x08,
72 .isr = 0x0c,
73 .isar = 0x10,
74 },
Sebastian Andrzej Siewior7e94dd12011-03-02 11:26:53 +010075 [REGS_CE4100] = {
76 .ibmr = 0x14,
77 .idbr = 0x0c,
78 .icr = 0x00,
79 .isr = 0x04,
80 /* no isar register */
81 },
Sebastian Andrzej Siewiord6668c72011-02-23 12:38:15 +010082};
Eric Miaof23d4912009-04-13 14:43:25 +080083
84static const struct platform_device_id i2c_pxa_id_table[] = {
Sebastian Andrzej Siewiord6668c72011-02-23 12:38:15 +010085 { "pxa2xx-i2c", REGS_PXA2XX },
86 { "pxa3xx-pwri2c", REGS_PXA3XX },
Sebastian Andrzej Siewior7e94dd12011-03-02 11:26:53 +010087 { "ce4100-i2c", REGS_CE4100 },
Eric Miaof23d4912009-04-13 14:43:25 +080088 { },
89};
90MODULE_DEVICE_TABLE(platform, i2c_pxa_id_table);
91
92/*
Sebastian Andrzej Siewiord6668c72011-02-23 12:38:15 +010093 * I2C bit definitions
Eric Miao283afa02008-09-08 14:15:08 +080094 */
Eric Miao283afa02008-09-08 14:15:08 +080095
96#define ICR_START (1 << 0) /* start bit */
97#define ICR_STOP (1 << 1) /* stop bit */
98#define ICR_ACKNAK (1 << 2) /* send ACK(0) or NAK(1) */
99#define ICR_TB (1 << 3) /* transfer byte bit */
100#define ICR_MA (1 << 4) /* master abort */
101#define ICR_SCLE (1 << 5) /* master clock enable */
102#define ICR_IUE (1 << 6) /* unit enable */
103#define ICR_GCD (1 << 7) /* general call disable */
104#define ICR_ITEIE (1 << 8) /* enable tx interrupts */
105#define ICR_IRFIE (1 << 9) /* enable rx interrupts */
106#define ICR_BEIE (1 << 10) /* enable bus error ints */
107#define ICR_SSDIE (1 << 11) /* slave STOP detected int enable */
108#define ICR_ALDIE (1 << 12) /* enable arbitration interrupt */
109#define ICR_SADIE (1 << 13) /* slave address detected int enable */
110#define ICR_UR (1 << 14) /* unit reset */
111#define ICR_FM (1 << 15) /* fast mode */
Leilei Shang9d3dda52013-06-07 14:38:17 +0800112#define ICR_HS (1 << 16) /* High Speed mode */
113#define ICR_GPIOEN (1 << 19) /* enable GPIO mode for SCL in HS */
Eric Miao283afa02008-09-08 14:15:08 +0800114
115#define ISR_RWM (1 << 0) /* read/write mode */
116#define ISR_ACKNAK (1 << 1) /* ack/nak status */
117#define ISR_UB (1 << 2) /* unit busy */
118#define ISR_IBB (1 << 3) /* bus busy */
119#define ISR_SSD (1 << 4) /* slave stop detected */
120#define ISR_ALD (1 << 5) /* arbitration loss detected */
121#define ISR_ITE (1 << 6) /* tx buffer empty */
122#define ISR_IRF (1 << 7) /* rx buffer full */
123#define ISR_GCAD (1 << 8) /* general call address detected */
124#define ISR_SAD (1 << 9) /* slave address detected */
125#define ISR_BED (1 << 10) /* bus error no ACK/NAK */
Russell Kingb652b432005-06-15 12:38:14 +0100126
127struct pxa_i2c {
128 spinlock_t lock;
129 wait_queue_head_t wait;
130 struct i2c_msg *msg;
131 unsigned int msg_num;
132 unsigned int msg_idx;
133 unsigned int msg_ptr;
134 unsigned int slave_addr;
135
136 struct i2c_adapter adap;
Russell Kingc3cef3f2007-08-20 10:19:10 +0100137 struct clk *clk;
Russell Kingb652b432005-06-15 12:38:14 +0100138#ifdef CONFIG_I2C_PXA_SLAVE
139 struct i2c_slave_client *slave;
140#endif
141
142 unsigned int irqlogidx;
143 u32 isrlog[32];
144 u32 icrlog[32];
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100145
146 void __iomem *reg_base;
Sebastian Andrzej Siewiord6668c72011-02-23 12:38:15 +0100147 void __iomem *reg_ibmr;
148 void __iomem *reg_idbr;
149 void __iomem *reg_icr;
150 void __iomem *reg_isr;
151 void __iomem *reg_isar;
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100152
153 unsigned long iobase;
154 unsigned long iosize;
155
156 int irq;
Jonathan Cameronc46c9482008-10-03 15:07:36 +0100157 unsigned int use_pio :1;
158 unsigned int fast_mode :1;
Leilei Shang9d3dda52013-06-07 14:38:17 +0800159 unsigned int high_mode:1;
160 unsigned char master_code;
161 unsigned long rate;
162 bool highmode_enter;
Russell Kingb652b432005-06-15 12:38:14 +0100163};
164
Sebastian Andrzej Siewiord6668c72011-02-23 12:38:15 +0100165#define _IBMR(i2c) ((i2c)->reg_ibmr)
166#define _IDBR(i2c) ((i2c)->reg_idbr)
167#define _ICR(i2c) ((i2c)->reg_icr)
168#define _ISR(i2c) ((i2c)->reg_isr)
169#define _ISAR(i2c) ((i2c)->reg_isar)
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100170
Russell Kingb652b432005-06-15 12:38:14 +0100171/*
172 * I2C Slave mode address
173 */
174#define I2C_PXA_SLAVE_ADDR 0x1
175
Russell Kingb652b432005-06-15 12:38:14 +0100176#ifdef DEBUG
177
178struct bits {
179 u32 mask;
180 const char *set;
181 const char *unset;
182};
Jiri Slabyed113992007-10-18 23:40:28 -0700183#define PXA_BIT(m, s, u) { .mask = m, .set = s, .unset = u }
Russell Kingb652b432005-06-15 12:38:14 +0100184
185static inline void
186decode_bits(const char *prefix, const struct bits *bits, int num, u32 val)
187{
188 printk("%s %08x: ", prefix, val);
189 while (num--) {
190 const char *str = val & bits->mask ? bits->set : bits->unset;
191 if (str)
192 printk("%s ", str);
193 bits++;
194 }
195}
196
197static const struct bits isr_bits[] = {
Jiri Slabyed113992007-10-18 23:40:28 -0700198 PXA_BIT(ISR_RWM, "RX", "TX"),
199 PXA_BIT(ISR_ACKNAK, "NAK", "ACK"),
200 PXA_BIT(ISR_UB, "Bsy", "Rdy"),
201 PXA_BIT(ISR_IBB, "BusBsy", "BusRdy"),
202 PXA_BIT(ISR_SSD, "SlaveStop", NULL),
203 PXA_BIT(ISR_ALD, "ALD", NULL),
204 PXA_BIT(ISR_ITE, "TxEmpty", NULL),
205 PXA_BIT(ISR_IRF, "RxFull", NULL),
206 PXA_BIT(ISR_GCAD, "GenCall", NULL),
207 PXA_BIT(ISR_SAD, "SlaveAddr", NULL),
208 PXA_BIT(ISR_BED, "BusErr", NULL),
Russell Kingb652b432005-06-15 12:38:14 +0100209};
210
211static void decode_ISR(unsigned int val)
212{
Russell King6fd60fa2005-09-08 21:04:58 +0100213 decode_bits(KERN_DEBUG "ISR", isr_bits, ARRAY_SIZE(isr_bits), val);
Russell Kingb652b432005-06-15 12:38:14 +0100214 printk("\n");
215}
216
217static const struct bits icr_bits[] = {
Jiri Slabyed113992007-10-18 23:40:28 -0700218 PXA_BIT(ICR_START, "START", NULL),
219 PXA_BIT(ICR_STOP, "STOP", NULL),
220 PXA_BIT(ICR_ACKNAK, "ACKNAK", NULL),
221 PXA_BIT(ICR_TB, "TB", NULL),
222 PXA_BIT(ICR_MA, "MA", NULL),
223 PXA_BIT(ICR_SCLE, "SCLE", "scle"),
224 PXA_BIT(ICR_IUE, "IUE", "iue"),
225 PXA_BIT(ICR_GCD, "GCD", NULL),
226 PXA_BIT(ICR_ITEIE, "ITEIE", NULL),
227 PXA_BIT(ICR_IRFIE, "IRFIE", NULL),
228 PXA_BIT(ICR_BEIE, "BEIE", NULL),
229 PXA_BIT(ICR_SSDIE, "SSDIE", NULL),
230 PXA_BIT(ICR_ALDIE, "ALDIE", NULL),
231 PXA_BIT(ICR_SADIE, "SADIE", NULL),
232 PXA_BIT(ICR_UR, "UR", "ur"),
Russell Kingb652b432005-06-15 12:38:14 +0100233};
234
Holger Schurigd6a7b5f2008-02-11 16:51:41 +0100235#ifdef CONFIG_I2C_PXA_SLAVE
Russell Kingb652b432005-06-15 12:38:14 +0100236static void decode_ICR(unsigned int val)
237{
Russell King6fd60fa2005-09-08 21:04:58 +0100238 decode_bits(KERN_DEBUG "ICR", icr_bits, ARRAY_SIZE(icr_bits), val);
Russell Kingb652b432005-06-15 12:38:14 +0100239 printk("\n");
240}
Holger Schurigd6a7b5f2008-02-11 16:51:41 +0100241#endif
Russell Kingb652b432005-06-15 12:38:14 +0100242
243static unsigned int i2c_debug = DEBUG;
244
245static void i2c_pxa_show_state(struct pxa_i2c *i2c, int lno, const char *fname)
246{
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100247 dev_dbg(&i2c->adap.dev, "state:%s:%d: ISR=%08x, ICR=%08x, IBMR=%02x\n", fname, lno,
248 readl(_ISR(i2c)), readl(_ICR(i2c)), readl(_IBMR(i2c)));
Russell Kingb652b432005-06-15 12:38:14 +0100249}
250
Harvey Harrison08882d22008-04-22 22:16:47 +0200251#define show_state(i2c) i2c_pxa_show_state(i2c, __LINE__, __func__)
Russell Kingb652b432005-06-15 12:38:14 +0100252
253static void i2c_pxa_scream_blue_murder(struct pxa_i2c *i2c, const char *why)
254{
255 unsigned int i;
Frank Seidel154d22b2009-03-28 21:34:42 +0100256 printk(KERN_ERR "i2c: error: %s\n", why);
257 printk(KERN_ERR "i2c: msg_num: %d msg_idx: %d msg_ptr: %d\n",
Russell Kingb652b432005-06-15 12:38:14 +0100258 i2c->msg_num, i2c->msg_idx, i2c->msg_ptr);
Frank Seidel154d22b2009-03-28 21:34:42 +0100259 printk(KERN_ERR "i2c: ICR: %08x ISR: %08x\n",
260 readl(_ICR(i2c)), readl(_ISR(i2c)));
261 printk(KERN_DEBUG "i2c: log: ");
Russell Kingb652b432005-06-15 12:38:14 +0100262 for (i = 0; i < i2c->irqlogidx; i++)
263 printk("[%08x:%08x] ", i2c->isrlog[i], i2c->icrlog[i]);
264 printk("\n");
265}
266
Wolfram Sang0d813d92009-11-03 12:53:41 +0100267#else /* ifdef DEBUG */
268
269#define i2c_debug 0
270
271#define show_state(i2c) do { } while (0)
272#define decode_ISR(val) do { } while (0)
273#define decode_ICR(val) do { } while (0)
274#define i2c_pxa_scream_blue_murder(i2c, why) do { } while (0)
275
276#endif /* ifdef DEBUG / else */
277
278static void i2c_pxa_master_complete(struct pxa_i2c *i2c, int ret);
279static irqreturn_t i2c_pxa_handler(int this_irq, void *dev_id);
280
Russell Kingb652b432005-06-15 12:38:14 +0100281static inline int i2c_pxa_is_slavemode(struct pxa_i2c *i2c)
282{
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100283 return !(readl(_ICR(i2c)) & ICR_SCLE);
Russell Kingb652b432005-06-15 12:38:14 +0100284}
285
286static void i2c_pxa_abort(struct pxa_i2c *i2c)
287{
Dmitry Baryshkov387fa6a2008-08-18 14:38:48 +0100288 int i = 250;
Russell Kingb652b432005-06-15 12:38:14 +0100289
290 if (i2c_pxa_is_slavemode(i2c)) {
Russell King6fd60fa2005-09-08 21:04:58 +0100291 dev_dbg(&i2c->adap.dev, "%s: called in slave mode\n", __func__);
Russell Kingb652b432005-06-15 12:38:14 +0100292 return;
293 }
294
Dmitry Baryshkov387fa6a2008-08-18 14:38:48 +0100295 while ((i > 0) && (readl(_IBMR(i2c)) & 0x1) == 0) {
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100296 unsigned long icr = readl(_ICR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100297
298 icr &= ~ICR_START;
299 icr |= ICR_ACKNAK | ICR_STOP | ICR_TB;
300
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100301 writel(icr, _ICR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100302
303 show_state(i2c);
304
Dmitry Baryshkov387fa6a2008-08-18 14:38:48 +0100305 mdelay(1);
306 i --;
Russell Kingb652b432005-06-15 12:38:14 +0100307 }
308
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100309 writel(readl(_ICR(i2c)) & ~(ICR_MA | ICR_START | ICR_STOP),
310 _ICR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100311}
312
313static int i2c_pxa_wait_bus_not_busy(struct pxa_i2c *i2c)
314{
315 int timeout = DEF_TIMEOUT;
316
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100317 while (timeout-- && readl(_ISR(i2c)) & (ISR_IBB | ISR_UB)) {
318 if ((readl(_ISR(i2c)) & ISR_SAD) != 0)
Russell Kingb652b432005-06-15 12:38:14 +0100319 timeout += 4;
320
321 msleep(2);
322 show_state(i2c);
323 }
324
Roel Kluind10db3a2009-04-23 16:27:39 +0200325 if (timeout < 0)
Russell Kingb652b432005-06-15 12:38:14 +0100326 show_state(i2c);
327
Roel Kluind10db3a2009-04-23 16:27:39 +0200328 return timeout < 0 ? I2C_RETRY : 0;
Russell Kingb652b432005-06-15 12:38:14 +0100329}
330
331static int i2c_pxa_wait_master(struct pxa_i2c *i2c)
332{
333 unsigned long timeout = jiffies + HZ*4;
334
335 while (time_before(jiffies, timeout)) {
336 if (i2c_debug > 1)
Russell King6fd60fa2005-09-08 21:04:58 +0100337 dev_dbg(&i2c->adap.dev, "%s: %ld: ISR=%08x, ICR=%08x, IBMR=%02x\n",
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100338 __func__, (long)jiffies, readl(_ISR(i2c)), readl(_ICR(i2c)), readl(_IBMR(i2c)));
Russell Kingb652b432005-06-15 12:38:14 +0100339
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100340 if (readl(_ISR(i2c)) & ISR_SAD) {
Russell Kingb652b432005-06-15 12:38:14 +0100341 if (i2c_debug > 0)
Russell King6fd60fa2005-09-08 21:04:58 +0100342 dev_dbg(&i2c->adap.dev, "%s: Slave detected\n", __func__);
Russell Kingb652b432005-06-15 12:38:14 +0100343 goto out;
344 }
345
346 /* wait for unit and bus being not busy, and we also do a
347 * quick check of the i2c lines themselves to ensure they've
348 * gone high...
349 */
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100350 if ((readl(_ISR(i2c)) & (ISR_UB | ISR_IBB)) == 0 && readl(_IBMR(i2c)) == 3) {
Russell Kingb652b432005-06-15 12:38:14 +0100351 if (i2c_debug > 0)
Russell King6fd60fa2005-09-08 21:04:58 +0100352 dev_dbg(&i2c->adap.dev, "%s: done\n", __func__);
Russell Kingb652b432005-06-15 12:38:14 +0100353 return 1;
354 }
355
356 msleep(1);
357 }
358
359 if (i2c_debug > 0)
Russell King6fd60fa2005-09-08 21:04:58 +0100360 dev_dbg(&i2c->adap.dev, "%s: did not free\n", __func__);
Russell Kingb652b432005-06-15 12:38:14 +0100361 out:
362 return 0;
363}
364
365static int i2c_pxa_set_master(struct pxa_i2c *i2c)
366{
367 if (i2c_debug)
Russell King6fd60fa2005-09-08 21:04:58 +0100368 dev_dbg(&i2c->adap.dev, "setting to bus master\n");
Russell Kingb652b432005-06-15 12:38:14 +0100369
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100370 if ((readl(_ISR(i2c)) & (ISR_UB | ISR_IBB)) != 0) {
Russell King6fd60fa2005-09-08 21:04:58 +0100371 dev_dbg(&i2c->adap.dev, "%s: unit is busy\n", __func__);
Russell Kingb652b432005-06-15 12:38:14 +0100372 if (!i2c_pxa_wait_master(i2c)) {
Russell King6fd60fa2005-09-08 21:04:58 +0100373 dev_dbg(&i2c->adap.dev, "%s: error: unit busy\n", __func__);
Russell Kingb652b432005-06-15 12:38:14 +0100374 return I2C_RETRY;
375 }
376 }
377
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100378 writel(readl(_ICR(i2c)) | ICR_SCLE, _ICR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100379 return 0;
380}
381
382#ifdef CONFIG_I2C_PXA_SLAVE
383static int i2c_pxa_wait_slave(struct pxa_i2c *i2c)
384{
385 unsigned long timeout = jiffies + HZ*1;
386
387 /* wait for stop */
388
389 show_state(i2c);
390
391 while (time_before(jiffies, timeout)) {
392 if (i2c_debug > 1)
Russell King6fd60fa2005-09-08 21:04:58 +0100393 dev_dbg(&i2c->adap.dev, "%s: %ld: ISR=%08x, ICR=%08x, IBMR=%02x\n",
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100394 __func__, (long)jiffies, readl(_ISR(i2c)), readl(_ICR(i2c)), readl(_IBMR(i2c)));
Russell Kingb652b432005-06-15 12:38:14 +0100395
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100396 if ((readl(_ISR(i2c)) & (ISR_UB|ISR_IBB)) == 0 ||
397 (readl(_ISR(i2c)) & ISR_SAD) != 0 ||
398 (readl(_ICR(i2c)) & ICR_SCLE) == 0) {
Russell Kingb652b432005-06-15 12:38:14 +0100399 if (i2c_debug > 1)
Russell King6fd60fa2005-09-08 21:04:58 +0100400 dev_dbg(&i2c->adap.dev, "%s: done\n", __func__);
Russell Kingb652b432005-06-15 12:38:14 +0100401 return 1;
402 }
403
404 msleep(1);
405 }
406
407 if (i2c_debug > 0)
Russell King6fd60fa2005-09-08 21:04:58 +0100408 dev_dbg(&i2c->adap.dev, "%s: did not free\n", __func__);
Russell Kingb652b432005-06-15 12:38:14 +0100409 return 0;
410}
411
412/*
413 * clear the hold on the bus, and take of anything else
414 * that has been configured
415 */
416static void i2c_pxa_set_slave(struct pxa_i2c *i2c, int errcode)
417{
418 show_state(i2c);
419
420 if (errcode < 0) {
421 udelay(100); /* simple delay */
422 } else {
423 /* we need to wait for the stop condition to end */
424
425 /* if we where in stop, then clear... */
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100426 if (readl(_ICR(i2c)) & ICR_STOP) {
Russell Kingb652b432005-06-15 12:38:14 +0100427 udelay(100);
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100428 writel(readl(_ICR(i2c)) & ~ICR_STOP, _ICR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100429 }
430
431 if (!i2c_pxa_wait_slave(i2c)) {
Russell King6fd60fa2005-09-08 21:04:58 +0100432 dev_err(&i2c->adap.dev, "%s: wait timedout\n",
433 __func__);
Russell Kingb652b432005-06-15 12:38:14 +0100434 return;
435 }
436 }
437
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100438 writel(readl(_ICR(i2c)) & ~(ICR_STOP|ICR_ACKNAK|ICR_MA), _ICR(i2c));
439 writel(readl(_ICR(i2c)) & ~ICR_SCLE, _ICR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100440
441 if (i2c_debug) {
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100442 dev_dbg(&i2c->adap.dev, "ICR now %08x, ISR %08x\n", readl(_ICR(i2c)), readl(_ISR(i2c)));
443 decode_ICR(readl(_ICR(i2c)));
Russell Kingb652b432005-06-15 12:38:14 +0100444 }
445}
446#else
447#define i2c_pxa_set_slave(i2c, err) do { } while (0)
448#endif
449
450static void i2c_pxa_reset(struct pxa_i2c *i2c)
451{
452 pr_debug("Resetting I2C Controller Unit\n");
453
454 /* abort any transfer currently under way */
455 i2c_pxa_abort(i2c);
456
457 /* reset according to 9.8 */
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100458 writel(ICR_UR, _ICR(i2c));
459 writel(I2C_ISR_INIT, _ISR(i2c));
460 writel(readl(_ICR(i2c)) & ~ICR_UR, _ICR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100461
Sebastian Andrzej Siewior7e94dd12011-03-02 11:26:53 +0100462 if (i2c->reg_isar)
463 writel(i2c->slave_addr, _ISAR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100464
465 /* set control register values */
Jonathan Cameronc46c9482008-10-03 15:07:36 +0100466 writel(I2C_ICR_INIT | (i2c->fast_mode ? ICR_FM : 0), _ICR(i2c));
Leilei Shang9d3dda52013-06-07 14:38:17 +0800467 writel(readl(_ICR(i2c)) | (i2c->high_mode ? ICR_HS : 0), _ICR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100468
469#ifdef CONFIG_I2C_PXA_SLAVE
Russell King6fd60fa2005-09-08 21:04:58 +0100470 dev_info(&i2c->adap.dev, "Enabling slave mode\n");
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100471 writel(readl(_ICR(i2c)) | ICR_SADIE | ICR_ALDIE | ICR_SSDIE, _ICR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100472#endif
473
474 i2c_pxa_set_slave(i2c, 0);
475
476 /* enable unit */
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100477 writel(readl(_ICR(i2c)) | ICR_IUE, _ICR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100478 udelay(100);
479}
480
481
482#ifdef CONFIG_I2C_PXA_SLAVE
483/*
Russell Kingb652b432005-06-15 12:38:14 +0100484 * PXA I2C Slave mode
485 */
486
487static void i2c_pxa_slave_txempty(struct pxa_i2c *i2c, u32 isr)
488{
489 if (isr & ISR_BED) {
490 /* what should we do here? */
491 } else {
Russell King84b5abe2006-10-28 22:30:17 +0100492 int ret = 0;
493
494 if (i2c->slave != NULL)
495 ret = i2c->slave->read(i2c->slave->data);
Russell Kingb652b432005-06-15 12:38:14 +0100496
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100497 writel(ret, _IDBR(i2c));
498 writel(readl(_ICR(i2c)) | ICR_TB, _ICR(i2c)); /* allow next byte */
Russell Kingb652b432005-06-15 12:38:14 +0100499 }
500}
501
502static void i2c_pxa_slave_rxfull(struct pxa_i2c *i2c, u32 isr)
503{
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100504 unsigned int byte = readl(_IDBR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100505
506 if (i2c->slave != NULL)
507 i2c->slave->write(i2c->slave->data, byte);
508
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100509 writel(readl(_ICR(i2c)) | ICR_TB, _ICR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100510}
511
512static void i2c_pxa_slave_start(struct pxa_i2c *i2c, u32 isr)
513{
514 int timeout;
515
516 if (i2c_debug > 0)
Russell King6fd60fa2005-09-08 21:04:58 +0100517 dev_dbg(&i2c->adap.dev, "SAD, mode is slave-%cx\n",
Russell Kingb652b432005-06-15 12:38:14 +0100518 (isr & ISR_RWM) ? 'r' : 't');
519
520 if (i2c->slave != NULL)
521 i2c->slave->event(i2c->slave->data,
522 (isr & ISR_RWM) ? I2C_SLAVE_EVENT_START_READ : I2C_SLAVE_EVENT_START_WRITE);
523
524 /*
525 * slave could interrupt in the middle of us generating a
526 * start condition... if this happens, we'd better back off
527 * and stop holding the poor thing up
528 */
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100529 writel(readl(_ICR(i2c)) & ~(ICR_START|ICR_STOP), _ICR(i2c));
530 writel(readl(_ICR(i2c)) | ICR_TB, _ICR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100531
532 timeout = 0x10000;
533
534 while (1) {
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100535 if ((readl(_IBMR(i2c)) & 2) == 2)
Russell Kingb652b432005-06-15 12:38:14 +0100536 break;
537
538 timeout--;
539
540 if (timeout <= 0) {
Russell King6fd60fa2005-09-08 21:04:58 +0100541 dev_err(&i2c->adap.dev, "timeout waiting for SCL high\n");
Russell Kingb652b432005-06-15 12:38:14 +0100542 break;
543 }
544 }
545
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100546 writel(readl(_ICR(i2c)) & ~ICR_SCLE, _ICR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100547}
548
549static void i2c_pxa_slave_stop(struct pxa_i2c *i2c)
550{
551 if (i2c_debug > 2)
Russell King6fd60fa2005-09-08 21:04:58 +0100552 dev_dbg(&i2c->adap.dev, "ISR: SSD (Slave Stop)\n");
Russell Kingb652b432005-06-15 12:38:14 +0100553
554 if (i2c->slave != NULL)
555 i2c->slave->event(i2c->slave->data, I2C_SLAVE_EVENT_STOP);
556
557 if (i2c_debug > 2)
Russell King6fd60fa2005-09-08 21:04:58 +0100558 dev_dbg(&i2c->adap.dev, "ISR: SSD (Slave Stop) acked\n");
Russell Kingb652b432005-06-15 12:38:14 +0100559
560 /*
561 * If we have a master-mode message waiting,
562 * kick it off now that the slave has completed.
563 */
564 if (i2c->msg)
565 i2c_pxa_master_complete(i2c, I2C_RETRY);
566}
567#else
568static void i2c_pxa_slave_txempty(struct pxa_i2c *i2c, u32 isr)
569{
570 if (isr & ISR_BED) {
571 /* what should we do here? */
572 } else {
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100573 writel(0, _IDBR(i2c));
574 writel(readl(_ICR(i2c)) | ICR_TB, _ICR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100575 }
576}
577
578static void i2c_pxa_slave_rxfull(struct pxa_i2c *i2c, u32 isr)
579{
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100580 writel(readl(_ICR(i2c)) | ICR_TB | ICR_ACKNAK, _ICR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100581}
582
583static void i2c_pxa_slave_start(struct pxa_i2c *i2c, u32 isr)
584{
585 int timeout;
586
587 /*
588 * slave could interrupt in the middle of us generating a
589 * start condition... if this happens, we'd better back off
590 * and stop holding the poor thing up
591 */
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100592 writel(readl(_ICR(i2c)) & ~(ICR_START|ICR_STOP), _ICR(i2c));
593 writel(readl(_ICR(i2c)) | ICR_TB | ICR_ACKNAK, _ICR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100594
595 timeout = 0x10000;
596
597 while (1) {
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100598 if ((readl(_IBMR(i2c)) & 2) == 2)
Russell Kingb652b432005-06-15 12:38:14 +0100599 break;
600
601 timeout--;
602
603 if (timeout <= 0) {
Russell King6fd60fa2005-09-08 21:04:58 +0100604 dev_err(&i2c->adap.dev, "timeout waiting for SCL high\n");
Russell Kingb652b432005-06-15 12:38:14 +0100605 break;
606 }
607 }
608
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100609 writel(readl(_ICR(i2c)) & ~ICR_SCLE, _ICR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100610}
611
612static void i2c_pxa_slave_stop(struct pxa_i2c *i2c)
613{
614 if (i2c->msg)
615 i2c_pxa_master_complete(i2c, I2C_RETRY);
616}
617#endif
618
619/*
620 * PXA I2C Master mode
621 */
622
623static inline unsigned int i2c_pxa_addr_byte(struct i2c_msg *msg)
624{
625 unsigned int addr = (msg->addr & 0x7f) << 1;
626
627 if (msg->flags & I2C_M_RD)
628 addr |= 1;
629
630 return addr;
631}
632
633static inline void i2c_pxa_start_message(struct pxa_i2c *i2c)
634{
635 u32 icr;
636
637 /*
638 * Step 1: target slave address into IDBR
639 */
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100640 writel(i2c_pxa_addr_byte(i2c->msg), _IDBR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100641
642 /*
643 * Step 2: initiate the write.
644 */
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100645 icr = readl(_ICR(i2c)) & ~(ICR_STOP | ICR_ALDIE);
646 writel(icr | ICR_START | ICR_TB, _ICR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100647}
648
Jean Delvare7d054812007-05-01 23:26:33 +0200649static inline void i2c_pxa_stop_message(struct pxa_i2c *i2c)
650{
651 u32 icr;
652
653 /*
654 * Clear the STOP and ACK flags
655 */
656 icr = readl(_ICR(i2c));
657 icr &= ~(ICR_STOP | ICR_ACKNAK);
Russell King0cfe61e2007-05-10 03:15:32 -0700658 writel(icr, _ICR(i2c));
Jean Delvare7d054812007-05-01 23:26:33 +0200659}
660
Mike Rapoportb7a36702008-01-27 18:14:50 +0100661static int i2c_pxa_pio_set_master(struct pxa_i2c *i2c)
662{
663 /* make timeout the same as for interrupt based functions */
664 long timeout = 2 * DEF_TIMEOUT;
665
666 /*
667 * Wait for the bus to become free.
668 */
669 while (timeout-- && readl(_ISR(i2c)) & (ISR_IBB | ISR_UB)) {
670 udelay(1000);
671 show_state(i2c);
672 }
673
Roel Kluind10db3a2009-04-23 16:27:39 +0200674 if (timeout < 0) {
Mike Rapoportb7a36702008-01-27 18:14:50 +0100675 show_state(i2c);
676 dev_err(&i2c->adap.dev,
677 "i2c_pxa: timeout waiting for bus free\n");
678 return I2C_RETRY;
679 }
680
681 /*
682 * Set master mode.
683 */
684 writel(readl(_ICR(i2c)) | ICR_SCLE, _ICR(i2c));
685
686 return 0;
687}
688
Leilei Shang9d3dda52013-06-07 14:38:17 +0800689/*
690 * PXA I2C send master code
691 * 1. Load master code to IDBR and send it.
692 * Note for HS mode, set ICR [GPIOEN].
693 * 2. Wait until win arbitration.
694 */
695static int i2c_pxa_send_mastercode(struct pxa_i2c *i2c)
696{
697 u32 icr;
698 long timeout;
699
700 spin_lock_irq(&i2c->lock);
701 i2c->highmode_enter = true;
702 writel(i2c->master_code, _IDBR(i2c));
703
704 icr = readl(_ICR(i2c)) & ~(ICR_STOP | ICR_ALDIE);
705 icr |= ICR_GPIOEN | ICR_START | ICR_TB | ICR_ITEIE;
706 writel(icr, _ICR(i2c));
707
708 spin_unlock_irq(&i2c->lock);
709 timeout = wait_event_timeout(i2c->wait,
710 i2c->highmode_enter == false, HZ * 1);
711
712 i2c->highmode_enter = false;
713
714 return (timeout == 0) ? I2C_RETRY : 0;
715}
716
Mike Rapoportb7a36702008-01-27 18:14:50 +0100717static int i2c_pxa_do_pio_xfer(struct pxa_i2c *i2c,
718 struct i2c_msg *msg, int num)
719{
720 unsigned long timeout = 500000; /* 5 seconds */
721 int ret = 0;
722
723 ret = i2c_pxa_pio_set_master(i2c);
724 if (ret)
725 goto out;
726
727 i2c->msg = msg;
728 i2c->msg_num = num;
729 i2c->msg_idx = 0;
730 i2c->msg_ptr = 0;
731 i2c->irqlogidx = 0;
732
733 i2c_pxa_start_message(i2c);
734
Roel Kluina746b572009-02-24 19:19:48 +0100735 while (i2c->msg_num > 0 && --timeout) {
Mike Rapoportb7a36702008-01-27 18:14:50 +0100736 i2c_pxa_handler(0, i2c);
737 udelay(10);
738 }
739
740 i2c_pxa_stop_message(i2c);
741
742 /*
743 * We place the return code in i2c->msg_idx.
744 */
745 ret = i2c->msg_idx;
746
747out:
748 if (timeout == 0)
749 i2c_pxa_scream_blue_murder(i2c, "timeout");
750
751 return ret;
752}
753
Russell Kingb652b432005-06-15 12:38:14 +0100754/*
Jean Delvare3fb9a652006-01-18 23:17:01 +0100755 * We are protected by the adapter bus mutex.
Russell Kingb652b432005-06-15 12:38:14 +0100756 */
757static int i2c_pxa_do_xfer(struct pxa_i2c *i2c, struct i2c_msg *msg, int num)
758{
759 long timeout;
760 int ret;
761
762 /*
763 * Wait for the bus to become free.
764 */
765 ret = i2c_pxa_wait_bus_not_busy(i2c);
766 if (ret) {
Russell King6fd60fa2005-09-08 21:04:58 +0100767 dev_err(&i2c->adap.dev, "i2c_pxa: timeout waiting for bus free\n");
Russell Kingb652b432005-06-15 12:38:14 +0100768 goto out;
769 }
770
771 /*
772 * Set master mode.
773 */
774 ret = i2c_pxa_set_master(i2c);
775 if (ret) {
Russell King6fd60fa2005-09-08 21:04:58 +0100776 dev_err(&i2c->adap.dev, "i2c_pxa_set_master: error %d\n", ret);
Russell Kingb652b432005-06-15 12:38:14 +0100777 goto out;
778 }
779
Leilei Shang9d3dda52013-06-07 14:38:17 +0800780 if (i2c->high_mode) {
781 ret = i2c_pxa_send_mastercode(i2c);
782 if (ret) {
783 dev_err(&i2c->adap.dev, "i2c_pxa_send_mastercode timeout\n");
784 goto out;
785 }
786 }
787
Russell Kingb652b432005-06-15 12:38:14 +0100788 spin_lock_irq(&i2c->lock);
789
790 i2c->msg = msg;
791 i2c->msg_num = num;
792 i2c->msg_idx = 0;
793 i2c->msg_ptr = 0;
794 i2c->irqlogidx = 0;
795
796 i2c_pxa_start_message(i2c);
797
798 spin_unlock_irq(&i2c->lock);
799
800 /*
801 * The rest of the processing occurs in the interrupt handler.
802 */
803 timeout = wait_event_timeout(i2c->wait, i2c->msg_num == 0, HZ * 5);
Jean Delvare7d054812007-05-01 23:26:33 +0200804 i2c_pxa_stop_message(i2c);
Russell Kingb652b432005-06-15 12:38:14 +0100805
806 /*
807 * We place the return code in i2c->msg_idx.
808 */
809 ret = i2c->msg_idx;
810
Sebastian Andrzej Siewior93c92cf2011-02-23 12:38:19 +0100811 if (!timeout && i2c->msg_num) {
Russell Kingb652b432005-06-15 12:38:14 +0100812 i2c_pxa_scream_blue_murder(i2c, "timeout");
Sebastian Andrzej Siewior93c92cf2011-02-23 12:38:19 +0100813 ret = I2C_RETRY;
814 }
Russell Kingb652b432005-06-15 12:38:14 +0100815
816 out:
817 return ret;
818}
819
Mike Rapoportb7a36702008-01-27 18:14:50 +0100820static int i2c_pxa_pio_xfer(struct i2c_adapter *adap,
821 struct i2c_msg msgs[], int num)
822{
823 struct pxa_i2c *i2c = adap->algo_data;
824 int ret, i;
825
826 /* If the I2C controller is disabled we need to reset it
827 (probably due to a suspend/resume destroying state). We do
828 this here as we can then avoid worrying about resuming the
829 controller before its users. */
830 if (!(readl(_ICR(i2c)) & ICR_IUE))
831 i2c_pxa_reset(i2c);
832
833 for (i = adap->retries; i >= 0; i--) {
834 ret = i2c_pxa_do_pio_xfer(i2c, msgs, num);
835 if (ret != I2C_RETRY)
836 goto out;
837
838 if (i2c_debug)
839 dev_dbg(&adap->dev, "Retrying transmission\n");
840 udelay(100);
841 }
842 i2c_pxa_scream_blue_murder(i2c, "exhausted retries");
843 ret = -EREMOTEIO;
844 out:
845 i2c_pxa_set_slave(i2c, ret);
846 return ret;
847}
848
Russell Kingb652b432005-06-15 12:38:14 +0100849/*
850 * i2c_pxa_master_complete - complete the message and wake up.
851 */
852static void i2c_pxa_master_complete(struct pxa_i2c *i2c, int ret)
853{
854 i2c->msg_ptr = 0;
855 i2c->msg = NULL;
856 i2c->msg_idx ++;
857 i2c->msg_num = 0;
858 if (ret)
859 i2c->msg_idx = ret;
Mike Rapoportb7a36702008-01-27 18:14:50 +0100860 if (!i2c->use_pio)
861 wake_up(&i2c->wait);
Russell Kingb652b432005-06-15 12:38:14 +0100862}
863
864static void i2c_pxa_irq_txempty(struct pxa_i2c *i2c, u32 isr)
865{
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100866 u32 icr = readl(_ICR(i2c)) & ~(ICR_START|ICR_STOP|ICR_ACKNAK|ICR_TB);
Russell Kingb652b432005-06-15 12:38:14 +0100867
868 again:
869 /*
870 * If ISR_ALD is set, we lost arbitration.
871 */
872 if (isr & ISR_ALD) {
873 /*
874 * Do we need to do anything here? The PXA docs
875 * are vague about what happens.
876 */
877 i2c_pxa_scream_blue_murder(i2c, "ALD set");
878
879 /*
880 * We ignore this error. We seem to see spurious ALDs
881 * for seemingly no reason. If we handle them as I think
882 * they should, we end up causing an I2C error, which
883 * is painful for some systems.
884 */
885 return; /* ignore */
886 }
887
888 if (isr & ISR_BED) {
889 int ret = BUS_ERROR;
890
891 /*
892 * I2C bus error - either the device NAK'd us, or
893 * something more serious happened. If we were NAK'd
894 * on the initial address phase, we can retry.
895 */
896 if (isr & ISR_ACKNAK) {
897 if (i2c->msg_ptr == 0 && i2c->msg_idx == 0)
898 ret = I2C_RETRY;
899 else
900 ret = XFER_NAKED;
901 }
902 i2c_pxa_master_complete(i2c, ret);
903 } else if (isr & ISR_RWM) {
904 /*
905 * Read mode. We have just sent the address byte, and
906 * now we must initiate the transfer.
907 */
908 if (i2c->msg_ptr == i2c->msg->len - 1 &&
909 i2c->msg_idx == i2c->msg_num - 1)
910 icr |= ICR_STOP | ICR_ACKNAK;
911
912 icr |= ICR_ALDIE | ICR_TB;
913 } else if (i2c->msg_ptr < i2c->msg->len) {
914 /*
915 * Write mode. Write the next data byte.
916 */
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100917 writel(i2c->msg->buf[i2c->msg_ptr++], _IDBR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100918
919 icr |= ICR_ALDIE | ICR_TB;
920
921 /*
922 * If this is the last byte of the last message, send
923 * a STOP.
924 */
925 if (i2c->msg_ptr == i2c->msg->len &&
926 i2c->msg_idx == i2c->msg_num - 1)
927 icr |= ICR_STOP;
928 } else if (i2c->msg_idx < i2c->msg_num - 1) {
929 /*
930 * Next segment of the message.
931 */
932 i2c->msg_ptr = 0;
933 i2c->msg_idx ++;
934 i2c->msg++;
935
936 /*
937 * If we aren't doing a repeated start and address,
938 * go back and try to send the next byte. Note that
939 * we do not support switching the R/W direction here.
940 */
941 if (i2c->msg->flags & I2C_M_NOSTART)
942 goto again;
943
944 /*
945 * Write the next address.
946 */
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100947 writel(i2c_pxa_addr_byte(i2c->msg), _IDBR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100948
949 /*
950 * And trigger a repeated start, and send the byte.
951 */
952 icr &= ~ICR_ALDIE;
953 icr |= ICR_START | ICR_TB;
954 } else {
955 if (i2c->msg->len == 0) {
956 /*
957 * Device probes have a message length of zero
958 * and need the bus to be reset before it can
959 * be used again.
960 */
961 i2c_pxa_reset(i2c);
962 }
963 i2c_pxa_master_complete(i2c, 0);
964 }
965
966 i2c->icrlog[i2c->irqlogidx-1] = icr;
967
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100968 writel(icr, _ICR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100969 show_state(i2c);
970}
971
972static void i2c_pxa_irq_rxfull(struct pxa_i2c *i2c, u32 isr)
973{
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100974 u32 icr = readl(_ICR(i2c)) & ~(ICR_START|ICR_STOP|ICR_ACKNAK|ICR_TB);
Russell Kingb652b432005-06-15 12:38:14 +0100975
976 /*
977 * Read the byte.
978 */
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100979 i2c->msg->buf[i2c->msg_ptr++] = readl(_IDBR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100980
981 if (i2c->msg_ptr < i2c->msg->len) {
982 /*
983 * If this is the last byte of the last
984 * message, send a STOP.
985 */
986 if (i2c->msg_ptr == i2c->msg->len - 1)
987 icr |= ICR_STOP | ICR_ACKNAK;
988
989 icr |= ICR_ALDIE | ICR_TB;
990 } else {
991 i2c_pxa_master_complete(i2c, 0);
992 }
993
994 i2c->icrlog[i2c->irqlogidx-1] = icr;
995
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +0100996 writel(icr, _ICR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +0100997}
998
Sebastian Andrzej Siewiorc66dc522011-02-23 12:38:18 +0100999#define VALID_INT_SOURCE (ISR_SSD | ISR_ALD | ISR_ITE | ISR_IRF | \
1000 ISR_SAD | ISR_BED)
David Howells7d12e782006-10-05 14:55:46 +01001001static irqreturn_t i2c_pxa_handler(int this_irq, void *dev_id)
Russell Kingb652b432005-06-15 12:38:14 +01001002{
1003 struct pxa_i2c *i2c = dev_id;
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +01001004 u32 isr = readl(_ISR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +01001005
Vasily Khoruzhick97491ba2011-03-13 15:53:29 +02001006 if (!(isr & VALID_INT_SOURCE))
Sebastian Andrzej Siewiorc66dc522011-02-23 12:38:18 +01001007 return IRQ_NONE;
1008
Russell Kingb652b432005-06-15 12:38:14 +01001009 if (i2c_debug > 2 && 0) {
Russell King6fd60fa2005-09-08 21:04:58 +01001010 dev_dbg(&i2c->adap.dev, "%s: ISR=%08x, ICR=%08x, IBMR=%02x\n",
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +01001011 __func__, isr, readl(_ICR(i2c)), readl(_IBMR(i2c)));
Russell Kingb652b432005-06-15 12:38:14 +01001012 decode_ISR(isr);
1013 }
1014
Tobias Klauser7e3d7db2006-01-09 23:19:51 +01001015 if (i2c->irqlogidx < ARRAY_SIZE(i2c->isrlog))
Russell Kingb652b432005-06-15 12:38:14 +01001016 i2c->isrlog[i2c->irqlogidx++] = isr;
1017
1018 show_state(i2c);
1019
1020 /*
1021 * Always clear all pending IRQs.
1022 */
Vasily Khoruzhick97491ba2011-03-13 15:53:29 +02001023 writel(isr & VALID_INT_SOURCE, _ISR(i2c));
Russell Kingb652b432005-06-15 12:38:14 +01001024
1025 if (isr & ISR_SAD)
1026 i2c_pxa_slave_start(i2c, isr);
1027 if (isr & ISR_SSD)
1028 i2c_pxa_slave_stop(i2c);
1029
1030 if (i2c_pxa_is_slavemode(i2c)) {
1031 if (isr & ISR_ITE)
1032 i2c_pxa_slave_txempty(i2c, isr);
1033 if (isr & ISR_IRF)
1034 i2c_pxa_slave_rxfull(i2c, isr);
Leilei Shang9d3dda52013-06-07 14:38:17 +08001035 } else if (i2c->msg && (!i2c->highmode_enter)) {
Russell Kingb652b432005-06-15 12:38:14 +01001036 if (isr & ISR_ITE)
1037 i2c_pxa_irq_txempty(i2c, isr);
1038 if (isr & ISR_IRF)
1039 i2c_pxa_irq_rxfull(i2c, isr);
Leilei Shang9d3dda52013-06-07 14:38:17 +08001040 } else if ((isr & ISR_ITE) && i2c->highmode_enter) {
1041 i2c->highmode_enter = false;
1042 wake_up(&i2c->wait);
Russell Kingb652b432005-06-15 12:38:14 +01001043 } else {
1044 i2c_pxa_scream_blue_murder(i2c, "spurious irq");
1045 }
1046
1047 return IRQ_HANDLED;
1048}
1049
1050
1051static int i2c_pxa_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
1052{
1053 struct pxa_i2c *i2c = adap->algo_data;
1054 int ret, i;
1055
1056 for (i = adap->retries; i >= 0; i--) {
1057 ret = i2c_pxa_do_xfer(i2c, msgs, num);
1058 if (ret != I2C_RETRY)
1059 goto out;
1060
1061 if (i2c_debug)
Russell King6fd60fa2005-09-08 21:04:58 +01001062 dev_dbg(&adap->dev, "Retrying transmission\n");
Russell Kingb652b432005-06-15 12:38:14 +01001063 udelay(100);
1064 }
1065 i2c_pxa_scream_blue_murder(i2c, "exhausted retries");
1066 ret = -EREMOTEIO;
1067 out:
1068 i2c_pxa_set_slave(i2c, ret);
1069 return ret;
1070}
1071
Russell Kingda16e322005-09-14 22:54:45 +01001072static u32 i2c_pxa_functionality(struct i2c_adapter *adap)
1073{
1074 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
1075}
1076
Jean Delvare8f9082c2006-09-03 22:39:46 +02001077static const struct i2c_algorithm i2c_pxa_algorithm = {
Russell Kingb652b432005-06-15 12:38:14 +01001078 .master_xfer = i2c_pxa_xfer,
Russell Kingda16e322005-09-14 22:54:45 +01001079 .functionality = i2c_pxa_functionality,
Russell Kingb652b432005-06-15 12:38:14 +01001080};
1081
Mike Rapoportb7a36702008-01-27 18:14:50 +01001082static const struct i2c_algorithm i2c_pxa_pio_algorithm = {
1083 .master_xfer = i2c_pxa_pio_xfer,
1084 .functionality = i2c_pxa_functionality,
1085};
1086
Jingoo Haneae45e52014-05-15 15:46:11 +09001087static const struct of_device_id i2c_pxa_dt_ids[] = {
Haojian Zhuang63fe1222012-03-01 13:04:44 +08001088 { .compatible = "mrvl,pxa-i2c", .data = (void *)REGS_PXA2XX },
1089 { .compatible = "mrvl,pwri2c", .data = (void *)REGS_PXA3XX },
1090 { .compatible = "mrvl,mmp-twsi", .data = (void *)REGS_PXA2XX },
1091 {}
1092};
1093MODULE_DEVICE_TABLE(of, i2c_pxa_dt_ids);
1094
1095static int i2c_pxa_probe_dt(struct platform_device *pdev, struct pxa_i2c *i2c,
1096 enum pxa_i2c_types *i2c_types)
1097{
1098 struct device_node *np = pdev->dev.of_node;
1099 const struct of_device_id *of_id =
1100 of_match_device(i2c_pxa_dt_ids, &pdev->dev);
Haojian Zhuang63fe1222012-03-01 13:04:44 +08001101
1102 if (!of_id)
1103 return 1;
Doug Andersonfe69c552013-03-01 06:57:32 +00001104
1105 /* For device tree we always use the dynamic or alias-assigned ID */
1106 i2c->adap.nr = -1;
1107
Haojian Zhuang63fe1222012-03-01 13:04:44 +08001108 if (of_get_property(np, "mrvl,i2c-polling", NULL))
1109 i2c->use_pio = 1;
1110 if (of_get_property(np, "mrvl,i2c-fast-mode", NULL))
1111 i2c->fast_mode = 1;
1112 *i2c_types = (u32)(of_id->data);
1113 return 0;
1114}
1115
1116static int i2c_pxa_probe_pdata(struct platform_device *pdev,
1117 struct pxa_i2c *i2c,
1118 enum pxa_i2c_types *i2c_types)
1119{
Jingoo Han6d4028c2013-07-30 16:59:33 +09001120 struct i2c_pxa_platform_data *plat = dev_get_platdata(&pdev->dev);
Haojian Zhuang63fe1222012-03-01 13:04:44 +08001121 const struct platform_device_id *id = platform_get_device_id(pdev);
1122
1123 *i2c_types = id->driver_data;
1124 if (plat) {
1125 i2c->use_pio = plat->use_pio;
1126 i2c->fast_mode = plat->fast_mode;
Leilei Shang9d3dda52013-06-07 14:38:17 +08001127 i2c->high_mode = plat->high_mode;
1128 i2c->master_code = plat->master_code;
1129 if (!i2c->master_code)
1130 i2c->master_code = 0xe;
1131 i2c->rate = plat->rate;
Haojian Zhuang63fe1222012-03-01 13:04:44 +08001132 }
1133 return 0;
1134}
1135
Russell King3ae5eae2005-11-09 22:32:44 +00001136static int i2c_pxa_probe(struct platform_device *dev)
Russell Kingb652b432005-06-15 12:38:14 +01001137{
Jingoo Han6d4028c2013-07-30 16:59:33 +09001138 struct i2c_pxa_platform_data *plat = dev_get_platdata(&dev->dev);
Haojian Zhuang63fe1222012-03-01 13:04:44 +08001139 enum pxa_i2c_types i2c_type;
1140 struct pxa_i2c *i2c;
1141 struct resource *res = NULL;
1142 int ret, irq;
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +01001143
Enrico Scholz6776f3d2007-05-21 12:29:40 +01001144 i2c = kzalloc(sizeof(struct pxa_i2c), GFP_KERNEL);
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +01001145 if (!i2c) {
1146 ret = -ENOMEM;
1147 goto emalloc;
1148 }
1149
Doug Andersonfe69c552013-03-01 06:57:32 +00001150 /* Default adapter num to device id; i2c_pxa_probe_dt can override. */
1151 i2c->adap.nr = dev->id;
1152
Haojian Zhuang63fe1222012-03-01 13:04:44 +08001153 ret = i2c_pxa_probe_dt(dev, i2c, &i2c_type);
1154 if (ret > 0)
1155 ret = i2c_pxa_probe_pdata(dev, i2c, &i2c_type);
1156 if (ret < 0)
1157 goto eclk;
1158
1159 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1160 irq = platform_get_irq(dev, 0);
1161 if (res == NULL || irq < 0) {
1162 ret = -ENODEV;
1163 goto eclk;
1164 }
1165
1166 if (!request_mem_region(res->start, resource_size(res), res->name)) {
1167 ret = -ENOMEM;
1168 goto eclk;
1169 }
1170
Enrico Scholz6776f3d2007-05-21 12:29:40 +01001171 i2c->adap.owner = THIS_MODULE;
Enrico Scholz6776f3d2007-05-21 12:29:40 +01001172 i2c->adap.retries = 5;
1173
1174 spin_lock_init(&i2c->lock);
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +01001175 init_waitqueue_head(&i2c->wait);
Enrico Scholz6776f3d2007-05-21 12:29:40 +01001176
Doug Andersonfe69c552013-03-01 06:57:32 +00001177 strlcpy(i2c->adap.name, "pxa_i2c-i2c", sizeof(i2c->adap.name));
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +01001178
Russell Kinge0d8b132008-11-11 17:52:32 +00001179 i2c->clk = clk_get(&dev->dev, NULL);
Russell Kingc3cef3f2007-08-20 10:19:10 +01001180 if (IS_ERR(i2c->clk)) {
1181 ret = PTR_ERR(i2c->clk);
1182 goto eclk;
1183 }
1184
Linus Walleijc6ffdde2009-06-14 00:20:36 +02001185 i2c->reg_base = ioremap(res->start, resource_size(res));
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +01001186 if (!i2c->reg_base) {
1187 ret = -EIO;
1188 goto eremap;
1189 }
Sebastian Andrzej Siewiord6668c72011-02-23 12:38:15 +01001190
1191 i2c->reg_ibmr = i2c->reg_base + pxa_reg_layout[i2c_type].ibmr;
1192 i2c->reg_idbr = i2c->reg_base + pxa_reg_layout[i2c_type].idbr;
1193 i2c->reg_icr = i2c->reg_base + pxa_reg_layout[i2c_type].icr;
1194 i2c->reg_isr = i2c->reg_base + pxa_reg_layout[i2c_type].isr;
Sebastian Andrzej Siewior7e94dd12011-03-02 11:26:53 +01001195 if (i2c_type != REGS_CE4100)
1196 i2c->reg_isar = i2c->reg_base + pxa_reg_layout[i2c_type].isar;
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +01001197
1198 i2c->iobase = res->start;
Linus Walleijc6ffdde2009-06-14 00:20:36 +02001199 i2c->iosize = resource_size(res);
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +01001200
1201 i2c->irq = irq;
Russell Kingb652b432005-06-15 12:38:14 +01001202
1203 i2c->slave_addr = I2C_PXA_SLAVE_ADDR;
Leilei Shang9d3dda52013-06-07 14:38:17 +08001204 i2c->highmode_enter = false;
Russell Kingb652b432005-06-15 12:38:14 +01001205
Russell Kingb652b432005-06-15 12:38:14 +01001206 if (plat) {
Haojian Zhuang63fe1222012-03-01 13:04:44 +08001207#ifdef CONFIG_I2C_PXA_SLAVE
Russell Kingb652b432005-06-15 12:38:14 +01001208 i2c->slave_addr = plat->slave_addr;
Russell Kingbeea4942006-11-07 21:03:20 +00001209 i2c->slave = plat->slave;
Russell Kingb652b432005-06-15 12:38:14 +01001210#endif
Haojian Zhuang63fe1222012-03-01 13:04:44 +08001211 i2c->adap.class = plat->class;
1212 }
Russell Kingb652b432005-06-15 12:38:14 +01001213
Leilei Shang9d3dda52013-06-07 14:38:17 +08001214 if (i2c->high_mode) {
1215 if (i2c->rate) {
1216 clk_set_rate(i2c->clk, i2c->rate);
1217 pr_info("i2c: <%s> set rate to %ld\n",
1218 i2c->adap.name, clk_get_rate(i2c->clk));
1219 } else
1220 pr_warn("i2c: <%s> clock rate not set\n",
1221 i2c->adap.name);
1222 }
1223
Daniel Drake7a10f472013-06-17 11:30:36 -04001224 clk_prepare_enable(i2c->clk);
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +01001225
Mike Rapoportb7a36702008-01-27 18:14:50 +01001226 if (i2c->use_pio) {
1227 i2c->adap.algo = &i2c_pxa_pio_algorithm;
1228 } else {
1229 i2c->adap.algo = &i2c_pxa_algorithm;
Sebastian Andrzej Siewiorc66dc522011-02-23 12:38:18 +01001230 ret = request_irq(irq, i2c_pxa_handler, IRQF_SHARED,
Doug Andersonfe69c552013-03-01 06:57:32 +00001231 dev_name(&dev->dev), i2c);
Mike Rapoportb7a36702008-01-27 18:14:50 +01001232 if (ret)
1233 goto ereqirq;
1234 }
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +01001235
Russell Kingb652b432005-06-15 12:38:14 +01001236 i2c_pxa_reset(i2c);
1237
1238 i2c->adap.algo_data = i2c;
Russell King3ae5eae2005-11-09 22:32:44 +00001239 i2c->adap.dev.parent = &dev->dev;
Sebastian Andrzej Siewiorbaa8cab2011-02-23 12:38:20 +01001240#ifdef CONFIG_OF
1241 i2c->adap.dev.of_node = dev->dev.of_node;
1242#endif
Russell Kingb652b432005-06-15 12:38:14 +01001243
Grant Likely488bf312011-07-25 17:49:43 +02001244 ret = i2c_add_numbered_adapter(&i2c->adap);
Russell Kingb652b432005-06-15 12:38:14 +01001245 if (ret < 0) {
1246 printk(KERN_INFO "I2C: Failed to add bus\n");
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +01001247 goto eadapt;
Russell Kingb652b432005-06-15 12:38:14 +01001248 }
1249
Russell King3ae5eae2005-11-09 22:32:44 +00001250 platform_set_drvdata(dev, i2c);
Russell Kingb652b432005-06-15 12:38:14 +01001251
1252#ifdef CONFIG_I2C_PXA_SLAVE
1253 printk(KERN_INFO "I2C: %s: PXA I2C adapter, slave address %d\n",
Jean Delvare22e965c2009-01-07 14:29:16 +01001254 dev_name(&i2c->adap.dev), i2c->slave_addr);
Russell Kingb652b432005-06-15 12:38:14 +01001255#else
1256 printk(KERN_INFO "I2C: %s: PXA I2C adapter\n",
Jean Delvare22e965c2009-01-07 14:29:16 +01001257 dev_name(&i2c->adap.dev));
Russell Kingb652b432005-06-15 12:38:14 +01001258#endif
1259 return 0;
1260
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +01001261eadapt:
Mike Rapoportb7a36702008-01-27 18:14:50 +01001262 if (!i2c->use_pio)
1263 free_irq(irq, i2c);
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +01001264ereqirq:
Daniel Drake7a10f472013-06-17 11:30:36 -04001265 clk_disable_unprepare(i2c->clk);
Wolfram Sanga92b36e2008-02-24 20:03:42 +01001266 iounmap(i2c->reg_base);
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +01001267eremap:
Russell Kingc3cef3f2007-08-20 10:19:10 +01001268 clk_put(i2c->clk);
1269eclk:
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +01001270 kfree(i2c);
1271emalloc:
Linus Walleijc6ffdde2009-06-14 00:20:36 +02001272 release_mem_region(res->start, resource_size(res));
Russell Kingb652b432005-06-15 12:38:14 +01001273 return ret;
1274}
1275
Dmitry Torokhov0a6d2242013-02-19 22:50:10 +00001276static int i2c_pxa_remove(struct platform_device *dev)
Russell Kingb652b432005-06-15 12:38:14 +01001277{
Russell King3ae5eae2005-11-09 22:32:44 +00001278 struct pxa_i2c *i2c = platform_get_drvdata(dev);
Russell Kingb652b432005-06-15 12:38:14 +01001279
Russell Kingb652b432005-06-15 12:38:14 +01001280 i2c_del_adapter(&i2c->adap);
Mike Rapoportb7a36702008-01-27 18:14:50 +01001281 if (!i2c->use_pio)
1282 free_irq(i2c->irq, i2c);
Russell Kingc3cef3f2007-08-20 10:19:10 +01001283
Daniel Drake7a10f472013-06-17 11:30:36 -04001284 clk_disable_unprepare(i2c->clk);
Russell Kingc3cef3f2007-08-20 10:19:10 +01001285 clk_put(i2c->clk);
Russell Kingc3cef3f2007-08-20 10:19:10 +01001286
Wolfram Sanga92b36e2008-02-24 20:03:42 +01001287 iounmap(i2c->reg_base);
Guennadi Liakhovetskia7b4e552007-02-08 09:43:26 +01001288 release_mem_region(i2c->iobase, i2c->iosize);
1289 kfree(i2c);
Russell Kingb652b432005-06-15 12:38:14 +01001290
1291 return 0;
1292}
1293
Russell Kinge7d48fa2008-08-26 10:40:50 +01001294#ifdef CONFIG_PM
Magnus Damm57f4d4f2009-07-08 13:22:39 +02001295static int i2c_pxa_suspend_noirq(struct device *dev)
Russell Kinge7d48fa2008-08-26 10:40:50 +01001296{
Magnus Damm57f4d4f2009-07-08 13:22:39 +02001297 struct platform_device *pdev = to_platform_device(dev);
1298 struct pxa_i2c *i2c = platform_get_drvdata(pdev);
1299
Russell Kinge7d48fa2008-08-26 10:40:50 +01001300 clk_disable(i2c->clk);
Magnus Damm57f4d4f2009-07-08 13:22:39 +02001301
Russell Kinge7d48fa2008-08-26 10:40:50 +01001302 return 0;
1303}
1304
Magnus Damm57f4d4f2009-07-08 13:22:39 +02001305static int i2c_pxa_resume_noirq(struct device *dev)
Russell Kinge7d48fa2008-08-26 10:40:50 +01001306{
Magnus Damm57f4d4f2009-07-08 13:22:39 +02001307 struct platform_device *pdev = to_platform_device(dev);
1308 struct pxa_i2c *i2c = platform_get_drvdata(pdev);
Russell Kinge7d48fa2008-08-26 10:40:50 +01001309
1310 clk_enable(i2c->clk);
1311 i2c_pxa_reset(i2c);
1312
1313 return 0;
1314}
Magnus Damm57f4d4f2009-07-08 13:22:39 +02001315
Alexey Dobriyan47145212009-12-14 18:00:08 -08001316static const struct dev_pm_ops i2c_pxa_dev_pm_ops = {
Magnus Damm57f4d4f2009-07-08 13:22:39 +02001317 .suspend_noirq = i2c_pxa_suspend_noirq,
1318 .resume_noirq = i2c_pxa_resume_noirq,
1319};
1320
1321#define I2C_PXA_DEV_PM_OPS (&i2c_pxa_dev_pm_ops)
Russell Kinge7d48fa2008-08-26 10:40:50 +01001322#else
Magnus Damm57f4d4f2009-07-08 13:22:39 +02001323#define I2C_PXA_DEV_PM_OPS NULL
Russell Kinge7d48fa2008-08-26 10:40:50 +01001324#endif
1325
Russell King3ae5eae2005-11-09 22:32:44 +00001326static struct platform_driver i2c_pxa_driver = {
Russell Kingb652b432005-06-15 12:38:14 +01001327 .probe = i2c_pxa_probe,
Dmitry Torokhov0a6d2242013-02-19 22:50:10 +00001328 .remove = i2c_pxa_remove,
Russell King3ae5eae2005-11-09 22:32:44 +00001329 .driver = {
1330 .name = "pxa2xx-i2c",
Wolfram Sanga92b36e2008-02-24 20:03:42 +01001331 .owner = THIS_MODULE,
Magnus Damm57f4d4f2009-07-08 13:22:39 +02001332 .pm = I2C_PXA_DEV_PM_OPS,
Haojian Zhuang63fe1222012-03-01 13:04:44 +08001333 .of_match_table = i2c_pxa_dt_ids,
Russell King3ae5eae2005-11-09 22:32:44 +00001334 },
Eric Miaof23d4912009-04-13 14:43:25 +08001335 .id_table = i2c_pxa_id_table,
Russell Kingb652b432005-06-15 12:38:14 +01001336};
1337
1338static int __init i2c_adap_pxa_init(void)
1339{
Russell King3ae5eae2005-11-09 22:32:44 +00001340 return platform_driver_register(&i2c_pxa_driver);
Russell Kingb652b432005-06-15 12:38:14 +01001341}
1342
Wolfram Sanga92b36e2008-02-24 20:03:42 +01001343static void __exit i2c_adap_pxa_exit(void)
Russell Kingb652b432005-06-15 12:38:14 +01001344{
Holger Schurigd6a7b5f2008-02-11 16:51:41 +01001345 platform_driver_unregister(&i2c_pxa_driver);
Russell Kingb652b432005-06-15 12:38:14 +01001346}
1347
Richard Purdieece5f7b2006-01-12 16:30:23 +00001348MODULE_LICENSE("GPL");
Kay Sieversadd8eda2008-04-22 22:16:49 +02001349MODULE_ALIAS("platform:pxa2xx-i2c");
Richard Purdieece5f7b2006-01-12 16:30:23 +00001350
Uli Luckas47a9b132008-07-14 22:38:30 +02001351subsys_initcall(i2c_adap_pxa_init);
Russell Kingb652b432005-06-15 12:38:14 +01001352module_exit(i2c_adap_pxa_exit);