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I2C: OMAP2+: use platform_data ip revision to select register map
[mirror_ubuntu-bionic-kernel.git] / drivers / i2c / busses / i2c-omap.c
1 /*
2 * TI OMAP I2C master mode driver
3 *
4 * Copyright (C) 2003 MontaVista Software, Inc.
5 * Copyright (C) 2005 Nokia Corporation
6 * Copyright (C) 2004 - 2007 Texas Instruments.
7 *
8 * Originally written by MontaVista Software, Inc.
9 * Additional contributions by:
10 * Tony Lindgren <tony@atomide.com>
11 * Imre Deak <imre.deak@nokia.com>
12 * Juha Yrjölä <juha.yrjola@solidboot.com>
13 * Syed Khasim <x0khasim@ti.com>
14 * Nishant Menon <nm@ti.com>
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 */
30
31 #include <linux/module.h>
32 #include <linux/delay.h>
33 #include <linux/i2c.h>
34 #include <linux/err.h>
35 #include <linux/interrupt.h>
36 #include <linux/completion.h>
37 #include <linux/platform_device.h>
38 #include <linux/clk.h>
39 #include <linux/io.h>
40 #include <linux/slab.h>
41 #include <linux/i2c-omap.h>
42 #include <linux/pm_runtime.h>
43
44 /* I2C controller revisions */
45 #define OMAP_I2C_REV_2 0x20
46
47 /* I2C controller revisions present on specific hardware */
48 #define OMAP_I2C_REV_ON_2430 0x36
49 #define OMAP_I2C_REV_ON_3430 0x3C
50 #define OMAP_I2C_REV_ON_4430 0x40
51
52 /* timeout waiting for the controller to respond */
53 #define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000))
54
55 /* For OMAP3 I2C_IV has changed to I2C_WE (wakeup enable) */
56 enum {
57 OMAP_I2C_REV_REG = 0,
58 OMAP_I2C_IE_REG,
59 OMAP_I2C_STAT_REG,
60 OMAP_I2C_IV_REG,
61 OMAP_I2C_WE_REG,
62 OMAP_I2C_SYSS_REG,
63 OMAP_I2C_BUF_REG,
64 OMAP_I2C_CNT_REG,
65 OMAP_I2C_DATA_REG,
66 OMAP_I2C_SYSC_REG,
67 OMAP_I2C_CON_REG,
68 OMAP_I2C_OA_REG,
69 OMAP_I2C_SA_REG,
70 OMAP_I2C_PSC_REG,
71 OMAP_I2C_SCLL_REG,
72 OMAP_I2C_SCLH_REG,
73 OMAP_I2C_SYSTEST_REG,
74 OMAP_I2C_BUFSTAT_REG,
75 /* only on OMAP4430 */
76 OMAP_I2C_IP_V2_REVNB_LO,
77 OMAP_I2C_IP_V2_REVNB_HI,
78 OMAP_I2C_IP_V2_IRQSTATUS_RAW,
79 OMAP_I2C_IP_V2_IRQENABLE_SET,
80 OMAP_I2C_IP_V2_IRQENABLE_CLR,
81 };
82
83 /* I2C Interrupt Enable Register (OMAP_I2C_IE): */
84 #define OMAP_I2C_IE_XDR (1 << 14) /* TX Buffer drain int enable */
85 #define OMAP_I2C_IE_RDR (1 << 13) /* RX Buffer drain int enable */
86 #define OMAP_I2C_IE_XRDY (1 << 4) /* TX data ready int enable */
87 #define OMAP_I2C_IE_RRDY (1 << 3) /* RX data ready int enable */
88 #define OMAP_I2C_IE_ARDY (1 << 2) /* Access ready int enable */
89 #define OMAP_I2C_IE_NACK (1 << 1) /* No ack interrupt enable */
90 #define OMAP_I2C_IE_AL (1 << 0) /* Arbitration lost int ena */
91
92 /* I2C Status Register (OMAP_I2C_STAT): */
93 #define OMAP_I2C_STAT_XDR (1 << 14) /* TX Buffer draining */
94 #define OMAP_I2C_STAT_RDR (1 << 13) /* RX Buffer draining */
95 #define OMAP_I2C_STAT_BB (1 << 12) /* Bus busy */
96 #define OMAP_I2C_STAT_ROVR (1 << 11) /* Receive overrun */
97 #define OMAP_I2C_STAT_XUDF (1 << 10) /* Transmit underflow */
98 #define OMAP_I2C_STAT_AAS (1 << 9) /* Address as slave */
99 #define OMAP_I2C_STAT_AD0 (1 << 8) /* Address zero */
100 #define OMAP_I2C_STAT_XRDY (1 << 4) /* Transmit data ready */
101 #define OMAP_I2C_STAT_RRDY (1 << 3) /* Receive data ready */
102 #define OMAP_I2C_STAT_ARDY (1 << 2) /* Register access ready */
103 #define OMAP_I2C_STAT_NACK (1 << 1) /* No ack interrupt enable */
104 #define OMAP_I2C_STAT_AL (1 << 0) /* Arbitration lost int ena */
105
106 /* I2C WE wakeup enable register */
107 #define OMAP_I2C_WE_XDR_WE (1 << 14) /* TX drain wakup */
108 #define OMAP_I2C_WE_RDR_WE (1 << 13) /* RX drain wakeup */
109 #define OMAP_I2C_WE_AAS_WE (1 << 9) /* Address as slave wakeup*/
110 #define OMAP_I2C_WE_BF_WE (1 << 8) /* Bus free wakeup */
111 #define OMAP_I2C_WE_STC_WE (1 << 6) /* Start condition wakeup */
112 #define OMAP_I2C_WE_GC_WE (1 << 5) /* General call wakeup */
113 #define OMAP_I2C_WE_DRDY_WE (1 << 3) /* TX/RX data ready wakeup */
114 #define OMAP_I2C_WE_ARDY_WE (1 << 2) /* Reg access ready wakeup */
115 #define OMAP_I2C_WE_NACK_WE (1 << 1) /* No acknowledgment wakeup */
116 #define OMAP_I2C_WE_AL_WE (1 << 0) /* Arbitration lost wakeup */
117
118 #define OMAP_I2C_WE_ALL (OMAP_I2C_WE_XDR_WE | OMAP_I2C_WE_RDR_WE | \
119 OMAP_I2C_WE_AAS_WE | OMAP_I2C_WE_BF_WE | \
120 OMAP_I2C_WE_STC_WE | OMAP_I2C_WE_GC_WE | \
121 OMAP_I2C_WE_DRDY_WE | OMAP_I2C_WE_ARDY_WE | \
122 OMAP_I2C_WE_NACK_WE | OMAP_I2C_WE_AL_WE)
123
124 /* I2C Buffer Configuration Register (OMAP_I2C_BUF): */
125 #define OMAP_I2C_BUF_RDMA_EN (1 << 15) /* RX DMA channel enable */
126 #define OMAP_I2C_BUF_RXFIF_CLR (1 << 14) /* RX FIFO Clear */
127 #define OMAP_I2C_BUF_XDMA_EN (1 << 7) /* TX DMA channel enable */
128 #define OMAP_I2C_BUF_TXFIF_CLR (1 << 6) /* TX FIFO Clear */
129
130 /* I2C Configuration Register (OMAP_I2C_CON): */
131 #define OMAP_I2C_CON_EN (1 << 15) /* I2C module enable */
132 #define OMAP_I2C_CON_BE (1 << 14) /* Big endian mode */
133 #define OMAP_I2C_CON_OPMODE_HS (1 << 12) /* High Speed support */
134 #define OMAP_I2C_CON_STB (1 << 11) /* Start byte mode (master) */
135 #define OMAP_I2C_CON_MST (1 << 10) /* Master/slave mode */
136 #define OMAP_I2C_CON_TRX (1 << 9) /* TX/RX mode (master only) */
137 #define OMAP_I2C_CON_XA (1 << 8) /* Expand address */
138 #define OMAP_I2C_CON_RM (1 << 2) /* Repeat mode (master only) */
139 #define OMAP_I2C_CON_STP (1 << 1) /* Stop cond (master only) */
140 #define OMAP_I2C_CON_STT (1 << 0) /* Start condition (master) */
141
142 /* I2C SCL time value when Master */
143 #define OMAP_I2C_SCLL_HSSCLL 8
144 #define OMAP_I2C_SCLH_HSSCLH 8
145
146 /* I2C System Test Register (OMAP_I2C_SYSTEST): */
147 #ifdef DEBUG
148 #define OMAP_I2C_SYSTEST_ST_EN (1 << 15) /* System test enable */
149 #define OMAP_I2C_SYSTEST_FREE (1 << 14) /* Free running mode */
150 #define OMAP_I2C_SYSTEST_TMODE_MASK (3 << 12) /* Test mode select */
151 #define OMAP_I2C_SYSTEST_TMODE_SHIFT (12) /* Test mode select */
152 #define OMAP_I2C_SYSTEST_SCL_I (1 << 3) /* SCL line sense in */
153 #define OMAP_I2C_SYSTEST_SCL_O (1 << 2) /* SCL line drive out */
154 #define OMAP_I2C_SYSTEST_SDA_I (1 << 1) /* SDA line sense in */
155 #define OMAP_I2C_SYSTEST_SDA_O (1 << 0) /* SDA line drive out */
156 #endif
157
158 /* OCP_SYSSTATUS bit definitions */
159 #define SYSS_RESETDONE_MASK (1 << 0)
160
161 /* OCP_SYSCONFIG bit definitions */
162 #define SYSC_CLOCKACTIVITY_MASK (0x3 << 8)
163 #define SYSC_SIDLEMODE_MASK (0x3 << 3)
164 #define SYSC_ENAWAKEUP_MASK (1 << 2)
165 #define SYSC_SOFTRESET_MASK (1 << 1)
166 #define SYSC_AUTOIDLE_MASK (1 << 0)
167
168 #define SYSC_IDLEMODE_SMART 0x2
169 #define SYSC_CLOCKACTIVITY_FCLK 0x2
170
171 /* Errata definitions */
172 #define I2C_OMAP_ERRATA_I207 (1 << 0)
173 #define I2C_OMAP3_1P153 (1 << 1)
174
175 struct omap_i2c_dev {
176 struct device *dev;
177 void __iomem *base; /* virtual */
178 int irq;
179 int reg_shift; /* bit shift for I2C register addresses */
180 struct completion cmd_complete;
181 struct resource *ioarea;
182 u32 latency; /* maximum mpu wkup latency */
183 void (*set_mpu_wkup_lat)(struct device *dev,
184 long latency);
185 u32 speed; /* Speed of bus in Khz */
186 u16 cmd_err;
187 u8 *buf;
188 u8 *regs;
189 size_t buf_len;
190 struct i2c_adapter adapter;
191 u8 fifo_size; /* use as flag and value
192 * fifo_size==0 implies no fifo
193 * if set, should be trsh+1
194 */
195 u8 rev;
196 unsigned b_hw:1; /* bad h/w fixes */
197 unsigned idle:1;
198 u16 iestate; /* Saved interrupt register */
199 u16 pscstate;
200 u16 scllstate;
201 u16 sclhstate;
202 u16 bufstate;
203 u16 syscstate;
204 u16 westate;
205 u16 errata;
206 };
207
208 static const u8 reg_map_ip_v1[] = {
209 [OMAP_I2C_REV_REG] = 0x00,
210 [OMAP_I2C_IE_REG] = 0x01,
211 [OMAP_I2C_STAT_REG] = 0x02,
212 [OMAP_I2C_IV_REG] = 0x03,
213 [OMAP_I2C_WE_REG] = 0x03,
214 [OMAP_I2C_SYSS_REG] = 0x04,
215 [OMAP_I2C_BUF_REG] = 0x05,
216 [OMAP_I2C_CNT_REG] = 0x06,
217 [OMAP_I2C_DATA_REG] = 0x07,
218 [OMAP_I2C_SYSC_REG] = 0x08,
219 [OMAP_I2C_CON_REG] = 0x09,
220 [OMAP_I2C_OA_REG] = 0x0a,
221 [OMAP_I2C_SA_REG] = 0x0b,
222 [OMAP_I2C_PSC_REG] = 0x0c,
223 [OMAP_I2C_SCLL_REG] = 0x0d,
224 [OMAP_I2C_SCLH_REG] = 0x0e,
225 [OMAP_I2C_SYSTEST_REG] = 0x0f,
226 [OMAP_I2C_BUFSTAT_REG] = 0x10,
227 };
228
229 static const u8 reg_map_ip_v2[] = {
230 [OMAP_I2C_REV_REG] = 0x04,
231 [OMAP_I2C_IE_REG] = 0x2c,
232 [OMAP_I2C_STAT_REG] = 0x28,
233 [OMAP_I2C_IV_REG] = 0x34,
234 [OMAP_I2C_WE_REG] = 0x34,
235 [OMAP_I2C_SYSS_REG] = 0x90,
236 [OMAP_I2C_BUF_REG] = 0x94,
237 [OMAP_I2C_CNT_REG] = 0x98,
238 [OMAP_I2C_DATA_REG] = 0x9c,
239 [OMAP_I2C_SYSC_REG] = 0x20,
240 [OMAP_I2C_CON_REG] = 0xa4,
241 [OMAP_I2C_OA_REG] = 0xa8,
242 [OMAP_I2C_SA_REG] = 0xac,
243 [OMAP_I2C_PSC_REG] = 0xb0,
244 [OMAP_I2C_SCLL_REG] = 0xb4,
245 [OMAP_I2C_SCLH_REG] = 0xb8,
246 [OMAP_I2C_SYSTEST_REG] = 0xbC,
247 [OMAP_I2C_BUFSTAT_REG] = 0xc0,
248 [OMAP_I2C_IP_V2_REVNB_LO] = 0x00,
249 [OMAP_I2C_IP_V2_REVNB_HI] = 0x04,
250 [OMAP_I2C_IP_V2_IRQSTATUS_RAW] = 0x24,
251 [OMAP_I2C_IP_V2_IRQENABLE_SET] = 0x2c,
252 [OMAP_I2C_IP_V2_IRQENABLE_CLR] = 0x30,
253 };
254
255 static inline void omap_i2c_write_reg(struct omap_i2c_dev *i2c_dev,
256 int reg, u16 val)
257 {
258 __raw_writew(val, i2c_dev->base +
259 (i2c_dev->regs[reg] << i2c_dev->reg_shift));
260 }
261
262 static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg)
263 {
264 return __raw_readw(i2c_dev->base +
265 (i2c_dev->regs[reg] << i2c_dev->reg_shift));
266 }
267
268 static void omap_i2c_unidle(struct omap_i2c_dev *dev)
269 {
270 struct platform_device *pdev;
271 struct omap_i2c_bus_platform_data *pdata;
272
273 WARN_ON(!dev->idle);
274
275 pdev = to_platform_device(dev->dev);
276 pdata = pdev->dev.platform_data;
277
278 pm_runtime_get_sync(&pdev->dev);
279
280 if (cpu_is_omap34xx()) {
281 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
282 omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, dev->pscstate);
283 omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, dev->scllstate);
284 omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG, dev->sclhstate);
285 omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, dev->bufstate);
286 omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, dev->syscstate);
287 omap_i2c_write_reg(dev, OMAP_I2C_WE_REG, dev->westate);
288 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
289 }
290 dev->idle = 0;
291
292 /*
293 * Don't write to this register if the IE state is 0 as it can
294 * cause deadlock.
295 */
296 if (dev->iestate)
297 omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate);
298 }
299
300 static void omap_i2c_idle(struct omap_i2c_dev *dev)
301 {
302 struct platform_device *pdev;
303 struct omap_i2c_bus_platform_data *pdata;
304 u16 iv;
305
306 WARN_ON(dev->idle);
307
308 pdev = to_platform_device(dev->dev);
309 pdata = pdev->dev.platform_data;
310
311 dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
312 if (dev->rev >= OMAP_I2C_REV_ON_4430)
313 omap_i2c_write_reg(dev, OMAP_I2C_IP_V2_IRQENABLE_CLR, 1);
314 else
315 omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, 0);
316
317 if (dev->rev < OMAP_I2C_REV_2) {
318 iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG); /* Read clears */
319 } else {
320 omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, dev->iestate);
321
322 /* Flush posted write before the dev->idle store occurs */
323 omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG);
324 }
325 dev->idle = 1;
326
327 pm_runtime_put_sync(&pdev->dev);
328 }
329
330 static int omap_i2c_init(struct omap_i2c_dev *dev)
331 {
332 u16 psc = 0, scll = 0, sclh = 0, buf = 0;
333 u16 fsscll = 0, fssclh = 0, hsscll = 0, hssclh = 0;
334 unsigned long fclk_rate = 12000000;
335 unsigned long timeout;
336 unsigned long internal_clk = 0;
337 struct clk *fclk;
338
339 if (dev->rev >= OMAP_I2C_REV_2) {
340 /* Disable I2C controller before soft reset */
341 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG,
342 omap_i2c_read_reg(dev, OMAP_I2C_CON_REG) &
343 ~(OMAP_I2C_CON_EN));
344
345 omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, SYSC_SOFTRESET_MASK);
346 /* For some reason we need to set the EN bit before the
347 * reset done bit gets set. */
348 timeout = jiffies + OMAP_I2C_TIMEOUT;
349 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
350 while (!(omap_i2c_read_reg(dev, OMAP_I2C_SYSS_REG) &
351 SYSS_RESETDONE_MASK)) {
352 if (time_after(jiffies, timeout)) {
353 dev_warn(dev->dev, "timeout waiting "
354 "for controller reset\n");
355 return -ETIMEDOUT;
356 }
357 msleep(1);
358 }
359
360 /* SYSC register is cleared by the reset; rewrite it */
361 if (dev->rev == OMAP_I2C_REV_ON_2430) {
362
363 omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG,
364 SYSC_AUTOIDLE_MASK);
365
366 } else if (dev->rev >= OMAP_I2C_REV_ON_3430) {
367 dev->syscstate = SYSC_AUTOIDLE_MASK;
368 dev->syscstate |= SYSC_ENAWAKEUP_MASK;
369 dev->syscstate |= (SYSC_IDLEMODE_SMART <<
370 __ffs(SYSC_SIDLEMODE_MASK));
371 dev->syscstate |= (SYSC_CLOCKACTIVITY_FCLK <<
372 __ffs(SYSC_CLOCKACTIVITY_MASK));
373
374 omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG,
375 dev->syscstate);
376 /*
377 * Enabling all wakup sources to stop I2C freezing on
378 * WFI instruction.
379 * REVISIT: Some wkup sources might not be needed.
380 */
381 dev->westate = OMAP_I2C_WE_ALL;
382 omap_i2c_write_reg(dev, OMAP_I2C_WE_REG, dev->westate);
383 }
384 }
385 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
386
387 if (cpu_class_is_omap1()) {
388 /*
389 * The I2C functional clock is the armxor_ck, so there's
390 * no need to get "armxor_ck" separately. Now, if OMAP2420
391 * always returns 12MHz for the functional clock, we can
392 * do this bit unconditionally.
393 */
394 fclk = clk_get(dev->dev, "fck");
395 fclk_rate = clk_get_rate(fclk);
396 clk_put(fclk);
397
398 /* TRM for 5912 says the I2C clock must be prescaled to be
399 * between 7 - 12 MHz. The XOR input clock is typically
400 * 12, 13 or 19.2 MHz. So we should have code that produces:
401 *
402 * XOR MHz Divider Prescaler
403 * 12 1 0
404 * 13 2 1
405 * 19.2 2 1
406 */
407 if (fclk_rate > 12000000)
408 psc = fclk_rate / 12000000;
409 }
410
411 if (!(cpu_class_is_omap1() || cpu_is_omap2420())) {
412
413 /*
414 * HSI2C controller internal clk rate should be 19.2 Mhz for
415 * HS and for all modes on 2430. On 34xx we can use lower rate
416 * to get longer filter period for better noise suppression.
417 * The filter is iclk (fclk for HS) period.
418 */
419 if (dev->speed > 400 || cpu_is_omap2430())
420 internal_clk = 19200;
421 else if (dev->speed > 100)
422 internal_clk = 9600;
423 else
424 internal_clk = 4000;
425 fclk = clk_get(dev->dev, "fck");
426 fclk_rate = clk_get_rate(fclk) / 1000;
427 clk_put(fclk);
428
429 /* Compute prescaler divisor */
430 psc = fclk_rate / internal_clk;
431 psc = psc - 1;
432
433 /* If configured for High Speed */
434 if (dev->speed > 400) {
435 unsigned long scl;
436
437 /* For first phase of HS mode */
438 scl = internal_clk / 400;
439 fsscll = scl - (scl / 3) - 7;
440 fssclh = (scl / 3) - 5;
441
442 /* For second phase of HS mode */
443 scl = fclk_rate / dev->speed;
444 hsscll = scl - (scl / 3) - 7;
445 hssclh = (scl / 3) - 5;
446 } else if (dev->speed > 100) {
447 unsigned long scl;
448
449 /* Fast mode */
450 scl = internal_clk / dev->speed;
451 fsscll = scl - (scl / 3) - 7;
452 fssclh = (scl / 3) - 5;
453 } else {
454 /* Standard mode */
455 fsscll = internal_clk / (dev->speed * 2) - 7;
456 fssclh = internal_clk / (dev->speed * 2) - 5;
457 }
458 scll = (hsscll << OMAP_I2C_SCLL_HSSCLL) | fsscll;
459 sclh = (hssclh << OMAP_I2C_SCLH_HSSCLH) | fssclh;
460 } else {
461 /* Program desired operating rate */
462 fclk_rate /= (psc + 1) * 1000;
463 if (psc > 2)
464 psc = 2;
465 scll = fclk_rate / (dev->speed * 2) - 7 + psc;
466 sclh = fclk_rate / (dev->speed * 2) - 7 + psc;
467 }
468
469 /* Setup clock prescaler to obtain approx 12MHz I2C module clock: */
470 omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, psc);
471
472 /* SCL low and high time values */
473 omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, scll);
474 omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG, sclh);
475
476 if (dev->fifo_size) {
477 /* Note: setup required fifo size - 1. RTRSH and XTRSH */
478 buf = (dev->fifo_size - 1) << 8 | OMAP_I2C_BUF_RXFIF_CLR |
479 (dev->fifo_size - 1) | OMAP_I2C_BUF_TXFIF_CLR;
480 omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, buf);
481 }
482
483 /* Take the I2C module out of reset: */
484 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
485
486 dev->errata = 0;
487
488 if (cpu_is_omap2430() || cpu_is_omap34xx())
489 dev->errata |= I2C_OMAP_ERRATA_I207;
490
491 /* Enable interrupts */
492 dev->iestate = (OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY |
493 OMAP_I2C_IE_ARDY | OMAP_I2C_IE_NACK |
494 OMAP_I2C_IE_AL) | ((dev->fifo_size) ?
495 (OMAP_I2C_IE_RDR | OMAP_I2C_IE_XDR) : 0);
496 omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate);
497 if (cpu_is_omap34xx()) {
498 dev->pscstate = psc;
499 dev->scllstate = scll;
500 dev->sclhstate = sclh;
501 dev->bufstate = buf;
502 }
503 return 0;
504 }
505
506 /*
507 * Waiting on Bus Busy
508 */
509 static int omap_i2c_wait_for_bb(struct omap_i2c_dev *dev)
510 {
511 unsigned long timeout;
512
513 timeout = jiffies + OMAP_I2C_TIMEOUT;
514 while (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG) & OMAP_I2C_STAT_BB) {
515 if (time_after(jiffies, timeout)) {
516 dev_warn(dev->dev, "timeout waiting for bus ready\n");
517 return -ETIMEDOUT;
518 }
519 msleep(1);
520 }
521
522 return 0;
523 }
524
525 /*
526 * Low level master read/write transaction.
527 */
528 static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
529 struct i2c_msg *msg, int stop)
530 {
531 struct omap_i2c_dev *dev = i2c_get_adapdata(adap);
532 int r;
533 u16 w;
534
535 dev_dbg(dev->dev, "addr: 0x%04x, len: %d, flags: 0x%x, stop: %d\n",
536 msg->addr, msg->len, msg->flags, stop);
537
538 if (msg->len == 0)
539 return -EINVAL;
540
541 omap_i2c_write_reg(dev, OMAP_I2C_SA_REG, msg->addr);
542
543 /* REVISIT: Could the STB bit of I2C_CON be used with probing? */
544 dev->buf = msg->buf;
545 dev->buf_len = msg->len;
546
547 omap_i2c_write_reg(dev, OMAP_I2C_CNT_REG, dev->buf_len);
548
549 /* Clear the FIFO Buffers */
550 w = omap_i2c_read_reg(dev, OMAP_I2C_BUF_REG);
551 w |= OMAP_I2C_BUF_RXFIF_CLR | OMAP_I2C_BUF_TXFIF_CLR;
552 omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, w);
553
554 init_completion(&dev->cmd_complete);
555 dev->cmd_err = 0;
556
557 w = OMAP_I2C_CON_EN | OMAP_I2C_CON_MST | OMAP_I2C_CON_STT;
558
559 /* High speed configuration */
560 if (dev->speed > 400)
561 w |= OMAP_I2C_CON_OPMODE_HS;
562
563 if (msg->flags & I2C_M_TEN)
564 w |= OMAP_I2C_CON_XA;
565 if (!(msg->flags & I2C_M_RD))
566 w |= OMAP_I2C_CON_TRX;
567
568 if (!dev->b_hw && stop)
569 w |= OMAP_I2C_CON_STP;
570
571 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
572
573 /*
574 * Don't write stt and stp together on some hardware.
575 */
576 if (dev->b_hw && stop) {
577 unsigned long delay = jiffies + OMAP_I2C_TIMEOUT;
578 u16 con = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG);
579 while (con & OMAP_I2C_CON_STT) {
580 con = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG);
581
582 /* Let the user know if i2c is in a bad state */
583 if (time_after(jiffies, delay)) {
584 dev_err(dev->dev, "controller timed out "
585 "waiting for start condition to finish\n");
586 return -ETIMEDOUT;
587 }
588 cpu_relax();
589 }
590
591 w |= OMAP_I2C_CON_STP;
592 w &= ~OMAP_I2C_CON_STT;
593 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
594 }
595
596 /*
597 * REVISIT: We should abort the transfer on signals, but the bus goes
598 * into arbitration and we're currently unable to recover from it.
599 */
600 r = wait_for_completion_timeout(&dev->cmd_complete,
601 OMAP_I2C_TIMEOUT);
602 dev->buf_len = 0;
603 if (r < 0)
604 return r;
605 if (r == 0) {
606 dev_err(dev->dev, "controller timed out\n");
607 omap_i2c_init(dev);
608 return -ETIMEDOUT;
609 }
610
611 if (likely(!dev->cmd_err))
612 return 0;
613
614 /* We have an error */
615 if (dev->cmd_err & (OMAP_I2C_STAT_AL | OMAP_I2C_STAT_ROVR |
616 OMAP_I2C_STAT_XUDF)) {
617 omap_i2c_init(dev);
618 return -EIO;
619 }
620
621 if (dev->cmd_err & OMAP_I2C_STAT_NACK) {
622 if (msg->flags & I2C_M_IGNORE_NAK)
623 return 0;
624 if (stop) {
625 w = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG);
626 w |= OMAP_I2C_CON_STP;
627 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
628 }
629 return -EREMOTEIO;
630 }
631 return -EIO;
632 }
633
634
635 /*
636 * Prepare controller for a transaction and call omap_i2c_xfer_msg
637 * to do the work during IRQ processing.
638 */
639 static int
640 omap_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
641 {
642 struct omap_i2c_dev *dev = i2c_get_adapdata(adap);
643 int i;
644 int r;
645
646 omap_i2c_unidle(dev);
647
648 r = omap_i2c_wait_for_bb(dev);
649 if (r < 0)
650 goto out;
651
652 if (dev->set_mpu_wkup_lat != NULL)
653 dev->set_mpu_wkup_lat(dev->dev, dev->latency);
654
655 for (i = 0; i < num; i++) {
656 r = omap_i2c_xfer_msg(adap, &msgs[i], (i == (num - 1)));
657 if (r != 0)
658 break;
659 }
660
661 if (dev->set_mpu_wkup_lat != NULL)
662 dev->set_mpu_wkup_lat(dev->dev, -1);
663
664 if (r == 0)
665 r = num;
666
667 omap_i2c_wait_for_bb(dev);
668 out:
669 omap_i2c_idle(dev);
670 return r;
671 }
672
673 static u32
674 omap_i2c_func(struct i2c_adapter *adap)
675 {
676 return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
677 }
678
679 static inline void
680 omap_i2c_complete_cmd(struct omap_i2c_dev *dev, u16 err)
681 {
682 dev->cmd_err |= err;
683 complete(&dev->cmd_complete);
684 }
685
686 static inline void
687 omap_i2c_ack_stat(struct omap_i2c_dev *dev, u16 stat)
688 {
689 omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat);
690 }
691
692 static inline void i2c_omap_errata_i207(struct omap_i2c_dev *dev, u16 stat)
693 {
694 /*
695 * I2C Errata(Errata Nos. OMAP2: 1.67, OMAP3: 1.8)
696 * Not applicable for OMAP4.
697 * Under certain rare conditions, RDR could be set again
698 * when the bus is busy, then ignore the interrupt and
699 * clear the interrupt.
700 */
701 if (stat & OMAP_I2C_STAT_RDR) {
702 /* Step 1: If RDR is set, clear it */
703 omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RDR);
704
705 /* Step 2: */
706 if (!(omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG)
707 & OMAP_I2C_STAT_BB)) {
708
709 /* Step 3: */
710 if (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG)
711 & OMAP_I2C_STAT_RDR) {
712 omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RDR);
713 dev_dbg(dev->dev, "RDR when bus is busy.\n");
714 }
715
716 }
717 }
718 }
719
720 /* rev1 devices are apparently only on some 15xx */
721 #ifdef CONFIG_ARCH_OMAP15XX
722
723 static irqreturn_t
724 omap_i2c_rev1_isr(int this_irq, void *dev_id)
725 {
726 struct omap_i2c_dev *dev = dev_id;
727 u16 iv, w;
728
729 if (dev->idle)
730 return IRQ_NONE;
731
732 iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG);
733 switch (iv) {
734 case 0x00: /* None */
735 break;
736 case 0x01: /* Arbitration lost */
737 dev_err(dev->dev, "Arbitration lost\n");
738 omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_AL);
739 break;
740 case 0x02: /* No acknowledgement */
741 omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_NACK);
742 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_STP);
743 break;
744 case 0x03: /* Register access ready */
745 omap_i2c_complete_cmd(dev, 0);
746 break;
747 case 0x04: /* Receive data ready */
748 if (dev->buf_len) {
749 w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG);
750 *dev->buf++ = w;
751 dev->buf_len--;
752 if (dev->buf_len) {
753 *dev->buf++ = w >> 8;
754 dev->buf_len--;
755 }
756 } else
757 dev_err(dev->dev, "RRDY IRQ while no data requested\n");
758 break;
759 case 0x05: /* Transmit data ready */
760 if (dev->buf_len) {
761 w = *dev->buf++;
762 dev->buf_len--;
763 if (dev->buf_len) {
764 w |= *dev->buf++ << 8;
765 dev->buf_len--;
766 }
767 omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w);
768 } else
769 dev_err(dev->dev, "XRDY IRQ while no data to send\n");
770 break;
771 default:
772 return IRQ_NONE;
773 }
774
775 return IRQ_HANDLED;
776 }
777 #else
778 #define omap_i2c_rev1_isr NULL
779 #endif
780
781 /*
782 * OMAP3430 Errata 1.153: When an XRDY/XDR is hit, wait for XUDF before writing
783 * data to DATA_REG. Otherwise some data bytes can be lost while transferring
784 * them from the memory to the I2C interface.
785 */
786 static int errata_omap3_1p153(struct omap_i2c_dev *dev, u16 *stat, int *err)
787 {
788 unsigned long timeout = 10000;
789
790 while (--timeout && !(*stat & OMAP_I2C_STAT_XUDF)) {
791 if (*stat & (OMAP_I2C_STAT_NACK | OMAP_I2C_STAT_AL)) {
792 omap_i2c_ack_stat(dev, *stat & (OMAP_I2C_STAT_XRDY |
793 OMAP_I2C_STAT_XDR));
794 *err |= OMAP_I2C_STAT_XUDF;
795 return -ETIMEDOUT;
796 }
797
798 cpu_relax();
799 *stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG);
800 }
801
802 if (!timeout) {
803 dev_err(dev->dev, "timeout waiting on XUDF bit\n");
804 return 0;
805 }
806
807 return 0;
808 }
809
810 static irqreturn_t
811 omap_i2c_isr(int this_irq, void *dev_id)
812 {
813 struct omap_i2c_dev *dev = dev_id;
814 u16 bits;
815 u16 stat, w;
816 int err, count = 0;
817
818 if (dev->idle)
819 return IRQ_NONE;
820
821 bits = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
822 while ((stat = (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG))) & bits) {
823 dev_dbg(dev->dev, "IRQ (ISR = 0x%04x)\n", stat);
824 if (count++ == 100) {
825 dev_warn(dev->dev, "Too much work in one IRQ\n");
826 break;
827 }
828
829 err = 0;
830 complete:
831 /*
832 * Ack the stat in one go, but [R/X]DR and [R/X]RDY should be
833 * acked after the data operation is complete.
834 * Ref: TRM SWPU114Q Figure 18-31
835 */
836 omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat &
837 ~(OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR |
838 OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR));
839
840 if (stat & OMAP_I2C_STAT_NACK) {
841 err |= OMAP_I2C_STAT_NACK;
842 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG,
843 OMAP_I2C_CON_STP);
844 }
845 if (stat & OMAP_I2C_STAT_AL) {
846 dev_err(dev->dev, "Arbitration lost\n");
847 err |= OMAP_I2C_STAT_AL;
848 }
849 /*
850 * ProDB0017052: Clear ARDY bit twice
851 */
852 if (stat & (OMAP_I2C_STAT_ARDY | OMAP_I2C_STAT_NACK |
853 OMAP_I2C_STAT_AL)) {
854 omap_i2c_ack_stat(dev, stat &
855 (OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR |
856 OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR |
857 OMAP_I2C_STAT_ARDY));
858 omap_i2c_complete_cmd(dev, err);
859 return IRQ_HANDLED;
860 }
861 if (stat & (OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR)) {
862 u8 num_bytes = 1;
863
864 if (dev->errata & I2C_OMAP_ERRATA_I207)
865 i2c_omap_errata_i207(dev, stat);
866
867 if (dev->fifo_size) {
868 if (stat & OMAP_I2C_STAT_RRDY)
869 num_bytes = dev->fifo_size;
870 else /* read RXSTAT on RDR interrupt */
871 num_bytes = (omap_i2c_read_reg(dev,
872 OMAP_I2C_BUFSTAT_REG)
873 >> 8) & 0x3F;
874 }
875 while (num_bytes) {
876 num_bytes--;
877 w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG);
878 if (dev->buf_len) {
879 *dev->buf++ = w;
880 dev->buf_len--;
881 /*
882 * Data reg in 2430, omap3 and
883 * omap4 is 8 bit wide
884 */
885 if (cpu_class_is_omap1() ||
886 cpu_is_omap2420()) {
887 if (dev->buf_len) {
888 *dev->buf++ = w >> 8;
889 dev->buf_len--;
890 }
891 }
892 } else {
893 if (stat & OMAP_I2C_STAT_RRDY)
894 dev_err(dev->dev,
895 "RRDY IRQ while no data"
896 " requested\n");
897 if (stat & OMAP_I2C_STAT_RDR)
898 dev_err(dev->dev,
899 "RDR IRQ while no data"
900 " requested\n");
901 break;
902 }
903 }
904 omap_i2c_ack_stat(dev,
905 stat & (OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR));
906 continue;
907 }
908 if (stat & (OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR)) {
909 u8 num_bytes = 1;
910 if (dev->fifo_size) {
911 if (stat & OMAP_I2C_STAT_XRDY)
912 num_bytes = dev->fifo_size;
913 else /* read TXSTAT on XDR interrupt */
914 num_bytes = omap_i2c_read_reg(dev,
915 OMAP_I2C_BUFSTAT_REG)
916 & 0x3F;
917 }
918 while (num_bytes) {
919 num_bytes--;
920 w = 0;
921 if (dev->buf_len) {
922 w = *dev->buf++;
923 dev->buf_len--;
924 /*
925 * Data reg in 2430, omap3 and
926 * omap4 is 8 bit wide
927 */
928 if (cpu_class_is_omap1() ||
929 cpu_is_omap2420()) {
930 if (dev->buf_len) {
931 w |= *dev->buf++ << 8;
932 dev->buf_len--;
933 }
934 }
935 } else {
936 if (stat & OMAP_I2C_STAT_XRDY)
937 dev_err(dev->dev,
938 "XRDY IRQ while no "
939 "data to send\n");
940 if (stat & OMAP_I2C_STAT_XDR)
941 dev_err(dev->dev,
942 "XDR IRQ while no "
943 "data to send\n");
944 break;
945 }
946
947 if ((dev->errata & I2C_OMAP3_1P153) &&
948 errata_omap3_1p153(dev, &stat, &err))
949 goto complete;
950
951 omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w);
952 }
953 omap_i2c_ack_stat(dev,
954 stat & (OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR));
955 continue;
956 }
957 if (stat & OMAP_I2C_STAT_ROVR) {
958 dev_err(dev->dev, "Receive overrun\n");
959 dev->cmd_err |= OMAP_I2C_STAT_ROVR;
960 }
961 if (stat & OMAP_I2C_STAT_XUDF) {
962 dev_err(dev->dev, "Transmit underflow\n");
963 dev->cmd_err |= OMAP_I2C_STAT_XUDF;
964 }
965 }
966
967 return count ? IRQ_HANDLED : IRQ_NONE;
968 }
969
970 static const struct i2c_algorithm omap_i2c_algo = {
971 .master_xfer = omap_i2c_xfer,
972 .functionality = omap_i2c_func,
973 };
974
975 static int __devinit
976 omap_i2c_probe(struct platform_device *pdev)
977 {
978 struct omap_i2c_dev *dev;
979 struct i2c_adapter *adap;
980 struct resource *mem, *irq, *ioarea;
981 struct omap_i2c_bus_platform_data *pdata = pdev->dev.platform_data;
982 irq_handler_t isr;
983 int r;
984 u32 speed = 0;
985
986 /* NOTE: driver uses the static register mapping */
987 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
988 if (!mem) {
989 dev_err(&pdev->dev, "no mem resource?\n");
990 return -ENODEV;
991 }
992 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
993 if (!irq) {
994 dev_err(&pdev->dev, "no irq resource?\n");
995 return -ENODEV;
996 }
997
998 ioarea = request_mem_region(mem->start, resource_size(mem),
999 pdev->name);
1000 if (!ioarea) {
1001 dev_err(&pdev->dev, "I2C region already claimed\n");
1002 return -EBUSY;
1003 }
1004
1005 dev = kzalloc(sizeof(struct omap_i2c_dev), GFP_KERNEL);
1006 if (!dev) {
1007 r = -ENOMEM;
1008 goto err_release_region;
1009 }
1010
1011 if (pdata != NULL) {
1012 speed = pdata->clkrate;
1013 dev->set_mpu_wkup_lat = pdata->set_mpu_wkup_lat;
1014 } else {
1015 speed = 100; /* Default speed */
1016 dev->set_mpu_wkup_lat = NULL;
1017 }
1018
1019 dev->speed = speed;
1020 dev->idle = 1;
1021 dev->dev = &pdev->dev;
1022 dev->irq = irq->start;
1023 dev->base = ioremap(mem->start, resource_size(mem));
1024 if (!dev->base) {
1025 r = -ENOMEM;
1026 goto err_free_mem;
1027 }
1028
1029 platform_set_drvdata(pdev, dev);
1030
1031 if (cpu_is_omap7xx())
1032 dev->reg_shift = 1;
1033 else if (cpu_is_omap44xx())
1034 dev->reg_shift = 0;
1035 else
1036 dev->reg_shift = 2;
1037
1038 if (pdata->rev == OMAP_I2C_IP_VERSION_2)
1039 dev->regs = (u8 *)reg_map_ip_v2;
1040 else
1041 dev->regs = (u8 *)reg_map_ip_v1;
1042
1043 pm_runtime_enable(&pdev->dev);
1044 omap_i2c_unidle(dev);
1045
1046 dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff;
1047
1048 if (dev->rev <= OMAP_I2C_REV_ON_3430)
1049 dev->errata |= I2C_OMAP3_1P153;
1050
1051 if (!(cpu_class_is_omap1() || cpu_is_omap2420())) {
1052 u16 s;
1053
1054 /* Set up the fifo size - Get total size */
1055 s = (omap_i2c_read_reg(dev, OMAP_I2C_BUFSTAT_REG) >> 14) & 0x3;
1056 dev->fifo_size = 0x8 << s;
1057
1058 /*
1059 * Set up notification threshold as half the total available
1060 * size. This is to ensure that we can handle the status on int
1061 * call back latencies.
1062 */
1063 if (dev->rev >= OMAP_I2C_REV_ON_4430) {
1064 dev->fifo_size = 0;
1065 dev->b_hw = 0; /* Disable hardware fixes */
1066 } else {
1067 dev->fifo_size = (dev->fifo_size / 2);
1068 dev->b_hw = 1; /* Enable hardware fixes */
1069 }
1070 /* calculate wakeup latency constraint for MPU */
1071 if (dev->set_mpu_wkup_lat != NULL)
1072 dev->latency = (1000000 * dev->fifo_size) /
1073 (1000 * speed / 8);
1074 }
1075
1076 /* reset ASAP, clearing any IRQs */
1077 omap_i2c_init(dev);
1078
1079 isr = (dev->rev < OMAP_I2C_REV_2) ? omap_i2c_rev1_isr : omap_i2c_isr;
1080 r = request_irq(dev->irq, isr, 0, pdev->name, dev);
1081
1082 if (r) {
1083 dev_err(dev->dev, "failure requesting irq %i\n", dev->irq);
1084 goto err_unuse_clocks;
1085 }
1086
1087 dev_info(dev->dev, "bus %d rev%d.%d at %d kHz\n",
1088 pdev->id, dev->rev >> 4, dev->rev & 0xf, dev->speed);
1089
1090 omap_i2c_idle(dev);
1091
1092 adap = &dev->adapter;
1093 i2c_set_adapdata(adap, dev);
1094 adap->owner = THIS_MODULE;
1095 adap->class = I2C_CLASS_HWMON;
1096 strlcpy(adap->name, "OMAP I2C adapter", sizeof(adap->name));
1097 adap->algo = &omap_i2c_algo;
1098 adap->dev.parent = &pdev->dev;
1099
1100 /* i2c device drivers may be active on return from add_adapter() */
1101 adap->nr = pdev->id;
1102 r = i2c_add_numbered_adapter(adap);
1103 if (r) {
1104 dev_err(dev->dev, "failure adding adapter\n");
1105 goto err_free_irq;
1106 }
1107
1108 return 0;
1109
1110 err_free_irq:
1111 free_irq(dev->irq, dev);
1112 err_unuse_clocks:
1113 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
1114 omap_i2c_idle(dev);
1115 iounmap(dev->base);
1116 err_free_mem:
1117 platform_set_drvdata(pdev, NULL);
1118 kfree(dev);
1119 err_release_region:
1120 release_mem_region(mem->start, resource_size(mem));
1121
1122 return r;
1123 }
1124
1125 static int
1126 omap_i2c_remove(struct platform_device *pdev)
1127 {
1128 struct omap_i2c_dev *dev = platform_get_drvdata(pdev);
1129 struct resource *mem;
1130
1131 platform_set_drvdata(pdev, NULL);
1132
1133 free_irq(dev->irq, dev);
1134 i2c_del_adapter(&dev->adapter);
1135 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
1136 iounmap(dev->base);
1137 kfree(dev);
1138 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1139 release_mem_region(mem->start, resource_size(mem));
1140 return 0;
1141 }
1142
1143 static struct platform_driver omap_i2c_driver = {
1144 .probe = omap_i2c_probe,
1145 .remove = omap_i2c_remove,
1146 .driver = {
1147 .name = "omap_i2c",
1148 .owner = THIS_MODULE,
1149 },
1150 };
1151
1152 /* I2C may be needed to bring up other drivers */
1153 static int __init
1154 omap_i2c_init_driver(void)
1155 {
1156 return platform_driver_register(&omap_i2c_driver);
1157 }
1158 subsys_initcall(omap_i2c_init_driver);
1159
1160 static void __exit omap_i2c_exit_driver(void)
1161 {
1162 platform_driver_unregister(&omap_i2c_driver);
1163 }
1164 module_exit(omap_i2c_exit_driver);
1165
1166 MODULE_AUTHOR("MontaVista Software, Inc. (and others)");
1167 MODULE_DESCRIPTION("TI OMAP I2C bus adapter");
1168 MODULE_LICENSE("GPL");
1169 MODULE_ALIAS("platform:omap_i2c");
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