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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / i2c / busses / i2c-omap.c
blobf713eac550470cdac3139952e4229b639c05f798
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/of.h>
41 #include <linux/of_i2c.h>
42 #include <linux/of_device.h>
43 #include <linux/slab.h>
44 #include <linux/i2c-omap.h>
45 #include <linux/pm_runtime.h>
46
47 /* I2C controller revisions */
48 #define OMAP_I2C_OMAP1_REV_2 0x20
49
50 /* I2C controller revisions present on specific hardware */
51 #define OMAP_I2C_REV_ON_2430 0x36
52 #define OMAP_I2C_REV_ON_3430 0x3C
53 #define OMAP_I2C_REV_ON_3530_4430 0x40
54
55 /* timeout waiting for the controller to respond */
56 #define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000))
57
58 /* For OMAP3 I2C_IV has changed to I2C_WE (wakeup enable) */
59 enum {
60 OMAP_I2C_REV_REG = 0,
61 OMAP_I2C_IE_REG,
62 OMAP_I2C_STAT_REG,
63 OMAP_I2C_IV_REG,
64 OMAP_I2C_WE_REG,
65 OMAP_I2C_SYSS_REG,
66 OMAP_I2C_BUF_REG,
67 OMAP_I2C_CNT_REG,
68 OMAP_I2C_DATA_REG,
69 OMAP_I2C_SYSC_REG,
70 OMAP_I2C_CON_REG,
71 OMAP_I2C_OA_REG,
72 OMAP_I2C_SA_REG,
73 OMAP_I2C_PSC_REG,
74 OMAP_I2C_SCLL_REG,
75 OMAP_I2C_SCLH_REG,
76 OMAP_I2C_SYSTEST_REG,
77 OMAP_I2C_BUFSTAT_REG,
78 /* only on OMAP4430 */
79 OMAP_I2C_IP_V2_REVNB_LO,
80 OMAP_I2C_IP_V2_REVNB_HI,
81 OMAP_I2C_IP_V2_IRQSTATUS_RAW,
82 OMAP_I2C_IP_V2_IRQENABLE_SET,
83 OMAP_I2C_IP_V2_IRQENABLE_CLR,
84 };
85
86 /* I2C Interrupt Enable Register (OMAP_I2C_IE): */
87 #define OMAP_I2C_IE_XDR (1 << 14) /* TX Buffer drain int enable */
88 #define OMAP_I2C_IE_RDR (1 << 13) /* RX Buffer drain int enable */
89 #define OMAP_I2C_IE_XRDY (1 << 4) /* TX data ready int enable */
90 #define OMAP_I2C_IE_RRDY (1 << 3) /* RX data ready int enable */
91 #define OMAP_I2C_IE_ARDY (1 << 2) /* Access ready int enable */
92 #define OMAP_I2C_IE_NACK (1 << 1) /* No ack interrupt enable */
93 #define OMAP_I2C_IE_AL (1 << 0) /* Arbitration lost int ena */
94
95 /* I2C Status Register (OMAP_I2C_STAT): */
96 #define OMAP_I2C_STAT_XDR (1 << 14) /* TX Buffer draining */
97 #define OMAP_I2C_STAT_RDR (1 << 13) /* RX Buffer draining */
98 #define OMAP_I2C_STAT_BB (1 << 12) /* Bus busy */
99 #define OMAP_I2C_STAT_ROVR (1 << 11) /* Receive overrun */
100 #define OMAP_I2C_STAT_XUDF (1 << 10) /* Transmit underflow */
101 #define OMAP_I2C_STAT_AAS (1 << 9) /* Address as slave */
102 #define OMAP_I2C_STAT_AD0 (1 << 8) /* Address zero */
103 #define OMAP_I2C_STAT_XRDY (1 << 4) /* Transmit data ready */
104 #define OMAP_I2C_STAT_RRDY (1 << 3) /* Receive data ready */
105 #define OMAP_I2C_STAT_ARDY (1 << 2) /* Register access ready */
106 #define OMAP_I2C_STAT_NACK (1 << 1) /* No ack interrupt enable */
107 #define OMAP_I2C_STAT_AL (1 << 0) /* Arbitration lost int ena */
108
109 /* I2C WE wakeup enable register */
110 #define OMAP_I2C_WE_XDR_WE (1 << 14) /* TX drain wakup */
111 #define OMAP_I2C_WE_RDR_WE (1 << 13) /* RX drain wakeup */
112 #define OMAP_I2C_WE_AAS_WE (1 << 9) /* Address as slave wakeup*/
113 #define OMAP_I2C_WE_BF_WE (1 << 8) /* Bus free wakeup */
114 #define OMAP_I2C_WE_STC_WE (1 << 6) /* Start condition wakeup */
115 #define OMAP_I2C_WE_GC_WE (1 << 5) /* General call wakeup */
116 #define OMAP_I2C_WE_DRDY_WE (1 << 3) /* TX/RX data ready wakeup */
117 #define OMAP_I2C_WE_ARDY_WE (1 << 2) /* Reg access ready wakeup */
118 #define OMAP_I2C_WE_NACK_WE (1 << 1) /* No acknowledgment wakeup */
119 #define OMAP_I2C_WE_AL_WE (1 << 0) /* Arbitration lost wakeup */
120
121 #define OMAP_I2C_WE_ALL (OMAP_I2C_WE_XDR_WE | OMAP_I2C_WE_RDR_WE | \
122 OMAP_I2C_WE_AAS_WE | OMAP_I2C_WE_BF_WE | \
123 OMAP_I2C_WE_STC_WE | OMAP_I2C_WE_GC_WE | \
124 OMAP_I2C_WE_DRDY_WE | OMAP_I2C_WE_ARDY_WE | \
125 OMAP_I2C_WE_NACK_WE | OMAP_I2C_WE_AL_WE)
126
127 /* I2C Buffer Configuration Register (OMAP_I2C_BUF): */
128 #define OMAP_I2C_BUF_RDMA_EN (1 << 15) /* RX DMA channel enable */
129 #define OMAP_I2C_BUF_RXFIF_CLR (1 << 14) /* RX FIFO Clear */
130 #define OMAP_I2C_BUF_XDMA_EN (1 << 7) /* TX DMA channel enable */
131 #define OMAP_I2C_BUF_TXFIF_CLR (1 << 6) /* TX FIFO Clear */
132
133 /* I2C Configuration Register (OMAP_I2C_CON): */
134 #define OMAP_I2C_CON_EN (1 << 15) /* I2C module enable */
135 #define OMAP_I2C_CON_BE (1 << 14) /* Big endian mode */
136 #define OMAP_I2C_CON_OPMODE_HS (1 << 12) /* High Speed support */
137 #define OMAP_I2C_CON_STB (1 << 11) /* Start byte mode (master) */
138 #define OMAP_I2C_CON_MST (1 << 10) /* Master/slave mode */
139 #define OMAP_I2C_CON_TRX (1 << 9) /* TX/RX mode (master only) */
140 #define OMAP_I2C_CON_XA (1 << 8) /* Expand address */
141 #define OMAP_I2C_CON_RM (1 << 2) /* Repeat mode (master only) */
142 #define OMAP_I2C_CON_STP (1 << 1) /* Stop cond (master only) */
143 #define OMAP_I2C_CON_STT (1 << 0) /* Start condition (master) */
144
145 /* I2C SCL time value when Master */
146 #define OMAP_I2C_SCLL_HSSCLL 8
147 #define OMAP_I2C_SCLH_HSSCLH 8
148
149 /* I2C System Test Register (OMAP_I2C_SYSTEST): */
150 #ifdef DEBUG
151 #define OMAP_I2C_SYSTEST_ST_EN (1 << 15) /* System test enable */
152 #define OMAP_I2C_SYSTEST_FREE (1 << 14) /* Free running mode */
153 #define OMAP_I2C_SYSTEST_TMODE_MASK (3 << 12) /* Test mode select */
154 #define OMAP_I2C_SYSTEST_TMODE_SHIFT (12) /* Test mode select */
155 #define OMAP_I2C_SYSTEST_SCL_I (1 << 3) /* SCL line sense in */
156 #define OMAP_I2C_SYSTEST_SCL_O (1 << 2) /* SCL line drive out */
157 #define OMAP_I2C_SYSTEST_SDA_I (1 << 1) /* SDA line sense in */
158 #define OMAP_I2C_SYSTEST_SDA_O (1 << 0) /* SDA line drive out */
159 #endif
160
161 /* OCP_SYSSTATUS bit definitions */
162 #define SYSS_RESETDONE_MASK (1 << 0)
163
164 /* OCP_SYSCONFIG bit definitions */
165 #define SYSC_CLOCKACTIVITY_MASK (0x3 << 8)
166 #define SYSC_SIDLEMODE_MASK (0x3 << 3)
167 #define SYSC_ENAWAKEUP_MASK (1 << 2)
168 #define SYSC_SOFTRESET_MASK (1 << 1)
169 #define SYSC_AUTOIDLE_MASK (1 << 0)
170
171 #define SYSC_IDLEMODE_SMART 0x2
172 #define SYSC_CLOCKACTIVITY_FCLK 0x2
173
174 /* Errata definitions */
175 #define I2C_OMAP_ERRATA_I207 (1 << 0)
176 #define I2C_OMAP3_1P153 (1 << 1)
177
178 struct omap_i2c_dev {
179 struct device *dev;
180 void __iomem *base; /* virtual */
181 int irq;
182 int reg_shift; /* bit shift for I2C register addresses */
183 struct completion cmd_complete;
184 struct resource *ioarea;
185 u32 latency; /* maximum mpu wkup latency */
186 void (*set_mpu_wkup_lat)(struct device *dev,
187 long latency);
188 u32 speed; /* Speed of bus in kHz */
189 u32 dtrev; /* extra revision from DT */
190 u32 flags;
191 u16 cmd_err;
192 u8 *buf;
193 u8 *regs;
194 size_t buf_len;
195 struct i2c_adapter adapter;
196 u8 fifo_size; /* use as flag and value
197 * fifo_size==0 implies no fifo
198 * if set, should be trsh+1
199 */
200 u8 rev;
201 unsigned b_hw:1; /* bad h/w fixes */
202 u16 iestate; /* Saved interrupt register */
203 u16 pscstate;
204 u16 scllstate;
205 u16 sclhstate;
206 u16 bufstate;
207 u16 syscstate;
208 u16 westate;
209 u16 errata;
210 };
211
212 static const u8 reg_map_ip_v1[] = {
213 [OMAP_I2C_REV_REG] = 0x00,
214 [OMAP_I2C_IE_REG] = 0x01,
215 [OMAP_I2C_STAT_REG] = 0x02,
216 [OMAP_I2C_IV_REG] = 0x03,
217 [OMAP_I2C_WE_REG] = 0x03,
218 [OMAP_I2C_SYSS_REG] = 0x04,
219 [OMAP_I2C_BUF_REG] = 0x05,
220 [OMAP_I2C_CNT_REG] = 0x06,
221 [OMAP_I2C_DATA_REG] = 0x07,
222 [OMAP_I2C_SYSC_REG] = 0x08,
223 [OMAP_I2C_CON_REG] = 0x09,
224 [OMAP_I2C_OA_REG] = 0x0a,
225 [OMAP_I2C_SA_REG] = 0x0b,
226 [OMAP_I2C_PSC_REG] = 0x0c,
227 [OMAP_I2C_SCLL_REG] = 0x0d,
228 [OMAP_I2C_SCLH_REG] = 0x0e,
229 [OMAP_I2C_SYSTEST_REG] = 0x0f,
230 [OMAP_I2C_BUFSTAT_REG] = 0x10,
231 };
232
233 static const u8 reg_map_ip_v2[] = {
234 [OMAP_I2C_REV_REG] = 0x04,
235 [OMAP_I2C_IE_REG] = 0x2c,
236 [OMAP_I2C_STAT_REG] = 0x28,
237 [OMAP_I2C_IV_REG] = 0x34,
238 [OMAP_I2C_WE_REG] = 0x34,
239 [OMAP_I2C_SYSS_REG] = 0x90,
240 [OMAP_I2C_BUF_REG] = 0x94,
241 [OMAP_I2C_CNT_REG] = 0x98,
242 [OMAP_I2C_DATA_REG] = 0x9c,
243 [OMAP_I2C_SYSC_REG] = 0x10,
244 [OMAP_I2C_CON_REG] = 0xa4,
245 [OMAP_I2C_OA_REG] = 0xa8,
246 [OMAP_I2C_SA_REG] = 0xac,
247 [OMAP_I2C_PSC_REG] = 0xb0,
248 [OMAP_I2C_SCLL_REG] = 0xb4,
249 [OMAP_I2C_SCLH_REG] = 0xb8,
250 [OMAP_I2C_SYSTEST_REG] = 0xbC,
251 [OMAP_I2C_BUFSTAT_REG] = 0xc0,
252 [OMAP_I2C_IP_V2_REVNB_LO] = 0x00,
253 [OMAP_I2C_IP_V2_REVNB_HI] = 0x04,
254 [OMAP_I2C_IP_V2_IRQSTATUS_RAW] = 0x24,
255 [OMAP_I2C_IP_V2_IRQENABLE_SET] = 0x2c,
256 [OMAP_I2C_IP_V2_IRQENABLE_CLR] = 0x30,
257 };
258
259 static inline void omap_i2c_write_reg(struct omap_i2c_dev *i2c_dev,
260 int reg, u16 val)
261 {
262 __raw_writew(val, i2c_dev->base +
263 (i2c_dev->regs[reg] << i2c_dev->reg_shift));
264 }
265
266 static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg)
267 {
268 return __raw_readw(i2c_dev->base +
269 (i2c_dev->regs[reg] << i2c_dev->reg_shift));
270 }
271
272 static void omap_i2c_unidle(struct omap_i2c_dev *dev)
273 {
274 if (dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) {
275 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
276 omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, dev->pscstate);
277 omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, dev->scllstate);
278 omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG, dev->sclhstate);
279 omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, dev->bufstate);
280 omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, dev->syscstate);
281 omap_i2c_write_reg(dev, OMAP_I2C_WE_REG, dev->westate);
282 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
283 }
284
285 /*
286 * Don't write to this register if the IE state is 0 as it can
287 * cause deadlock.
288 */
289 if (dev->iestate)
290 omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate);
291 }
292
293 static void omap_i2c_idle(struct omap_i2c_dev *dev)
294 {
295 u16 iv;
296
297 dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
298 if (dev->dtrev == OMAP_I2C_IP_VERSION_2)
299 omap_i2c_write_reg(dev, OMAP_I2C_IP_V2_IRQENABLE_CLR, 1);
300 else
301 omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, 0);
302
303 if (dev->rev < OMAP_I2C_OMAP1_REV_2) {
304 iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG); /* Read clears */
305 } else {
306 omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, dev->iestate);
307
308 /* Flush posted write */
309 omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG);
310 }
311 }
312
313 static int omap_i2c_init(struct omap_i2c_dev *dev)
314 {
315 u16 psc = 0, scll = 0, sclh = 0, buf = 0;
316 u16 fsscll = 0, fssclh = 0, hsscll = 0, hssclh = 0;
317 unsigned long fclk_rate = 12000000;
318 unsigned long timeout;
319 unsigned long internal_clk = 0;
320 struct clk *fclk;
321
322 if (dev->rev >= OMAP_I2C_OMAP1_REV_2) {
323 /* Disable I2C controller before soft reset */
324 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG,
325 omap_i2c_read_reg(dev, OMAP_I2C_CON_REG) &
326 ~(OMAP_I2C_CON_EN));
327
328 omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, SYSC_SOFTRESET_MASK);
329 /* For some reason we need to set the EN bit before the
330 * reset done bit gets set. */
331 timeout = jiffies + OMAP_I2C_TIMEOUT;
332 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
333 while (!(omap_i2c_read_reg(dev, OMAP_I2C_SYSS_REG) &
334 SYSS_RESETDONE_MASK)) {
335 if (time_after(jiffies, timeout)) {
336 dev_warn(dev->dev, "timeout waiting "
337 "for controller reset\n");
338 return -ETIMEDOUT;
339 }
340 msleep(1);
341 }
342
343 /* SYSC register is cleared by the reset; rewrite it */
344 if (dev->rev == OMAP_I2C_REV_ON_2430) {
345
346 omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG,
347 SYSC_AUTOIDLE_MASK);
348
349 } else if (dev->rev >= OMAP_I2C_REV_ON_3430) {
350 dev->syscstate = SYSC_AUTOIDLE_MASK;
351 dev->syscstate |= SYSC_ENAWAKEUP_MASK;
352 dev->syscstate |= (SYSC_IDLEMODE_SMART <<
353 __ffs(SYSC_SIDLEMODE_MASK));
354 dev->syscstate |= (SYSC_CLOCKACTIVITY_FCLK <<
355 __ffs(SYSC_CLOCKACTIVITY_MASK));
356
357 omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG,
358 dev->syscstate);
359 /*
360 * Enabling all wakup sources to stop I2C freezing on
361 * WFI instruction.
362 * REVISIT: Some wkup sources might not be needed.
363 */
364 dev->westate = OMAP_I2C_WE_ALL;
365 omap_i2c_write_reg(dev, OMAP_I2C_WE_REG,
366 dev->westate);
367 }
368 }
369 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
370
371 if (dev->flags & OMAP_I2C_FLAG_ALWAYS_ARMXOR_CLK) {
372 /*
373 * The I2C functional clock is the armxor_ck, so there's
374 * no need to get "armxor_ck" separately. Now, if OMAP2420
375 * always returns 12MHz for the functional clock, we can
376 * do this bit unconditionally.
377 */
378 fclk = clk_get(dev->dev, "fck");
379 fclk_rate = clk_get_rate(fclk);
380 clk_put(fclk);
381
382 /* TRM for 5912 says the I2C clock must be prescaled to be
383 * between 7 - 12 MHz. The XOR input clock is typically
384 * 12, 13 or 19.2 MHz. So we should have code that produces:
385 *
386 * XOR MHz Divider Prescaler
387 * 12 1 0
388 * 13 2 1
389 * 19.2 2 1
390 */
391 if (fclk_rate > 12000000)
392 psc = fclk_rate / 12000000;
393 }
394
395 if (!(dev->flags & OMAP_I2C_FLAG_SIMPLE_CLOCK)) {
396
397 /*
398 * HSI2C controller internal clk rate should be 19.2 Mhz for
399 * HS and for all modes on 2430. On 34xx we can use lower rate
400 * to get longer filter period for better noise suppression.
401 * The filter is iclk (fclk for HS) period.
402 */
403 if (dev->speed > 400 ||
404 dev->flags & OMAP_I2C_FLAG_FORCE_19200_INT_CLK)
405 internal_clk = 19200;
406 else if (dev->speed > 100)
407 internal_clk = 9600;
408 else
409 internal_clk = 4000;
410 fclk = clk_get(dev->dev, "fck");
411 fclk_rate = clk_get_rate(fclk) / 1000;
412 clk_put(fclk);
413
414 /* Compute prescaler divisor */
415 psc = fclk_rate / internal_clk;
416 psc = psc - 1;
417
418 /* If configured for High Speed */
419 if (dev->speed > 400) {
420 unsigned long scl;
421
422 /* For first phase of HS mode */
423 scl = internal_clk / 400;
424 fsscll = scl - (scl / 3) - 7;
425 fssclh = (scl / 3) - 5;
426
427 /* For second phase of HS mode */
428 scl = fclk_rate / dev->speed;
429 hsscll = scl - (scl / 3) - 7;
430 hssclh = (scl / 3) - 5;
431 } else if (dev->speed > 100) {
432 unsigned long scl;
433
434 /* Fast mode */
435 scl = internal_clk / dev->speed;
436 fsscll = scl - (scl / 3) - 7;
437 fssclh = (scl / 3) - 5;
438 } else {
439 /* Standard mode */
440 fsscll = internal_clk / (dev->speed * 2) - 7;
441 fssclh = internal_clk / (dev->speed * 2) - 5;
442 }
443 scll = (hsscll << OMAP_I2C_SCLL_HSSCLL) | fsscll;
444 sclh = (hssclh << OMAP_I2C_SCLH_HSSCLH) | fssclh;
445 } else {
446 /* Program desired operating rate */
447 fclk_rate /= (psc + 1) * 1000;
448 if (psc > 2)
449 psc = 2;
450 scll = fclk_rate / (dev->speed * 2) - 7 + psc;
451 sclh = fclk_rate / (dev->speed * 2) - 7 + psc;
452 }
453
454 /* Setup clock prescaler to obtain approx 12MHz I2C module clock: */
455 omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, psc);
456
457 /* SCL low and high time values */
458 omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, scll);
459 omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG, sclh);
460
461 if (dev->fifo_size) {
462 /* Note: setup required fifo size - 1. RTRSH and XTRSH */
463 buf = (dev->fifo_size - 1) << 8 | OMAP_I2C_BUF_RXFIF_CLR |
464 (dev->fifo_size - 1) | OMAP_I2C_BUF_TXFIF_CLR;
465 omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, buf);
466 }
467
468 /* Take the I2C module out of reset: */
469 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
470
471 dev->errata = 0;
472
473 if (dev->flags & OMAP_I2C_FLAG_APPLY_ERRATA_I207)
474 dev->errata |= I2C_OMAP_ERRATA_I207;
475
476 /* Enable interrupts */
477 dev->iestate = (OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY |
478 OMAP_I2C_IE_ARDY | OMAP_I2C_IE_NACK |
479 OMAP_I2C_IE_AL) | ((dev->fifo_size) ?
480 (OMAP_I2C_IE_RDR | OMAP_I2C_IE_XDR) : 0);
481 omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate);
482 if (dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) {
483 dev->pscstate = psc;
484 dev->scllstate = scll;
485 dev->sclhstate = sclh;
486 dev->bufstate = buf;
487 }
488 return 0;
489 }
490
491 /*
492 * Waiting on Bus Busy
493 */
494 static int omap_i2c_wait_for_bb(struct omap_i2c_dev *dev)
495 {
496 unsigned long timeout;
497
498 timeout = jiffies + OMAP_I2C_TIMEOUT;
499 while (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG) & OMAP_I2C_STAT_BB) {
500 if (time_after(jiffies, timeout)) {
501 dev_warn(dev->dev, "timeout waiting for bus ready\n");
502 return -ETIMEDOUT;
503 }
504 msleep(1);
505 }
506
507 return 0;
508 }
509
510 /*
511 * Low level master read/write transaction.
512 */
513 static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
514 struct i2c_msg *msg, int stop)
515 {
516 struct omap_i2c_dev *dev = i2c_get_adapdata(adap);
517 int r;
518 u16 w;
519
520 dev_dbg(dev->dev, "addr: 0x%04x, len: %d, flags: 0x%x, stop: %d\n",
521 msg->addr, msg->len, msg->flags, stop);
522
523 if (msg->len == 0)
524 return -EINVAL;
525
526 omap_i2c_write_reg(dev, OMAP_I2C_SA_REG, msg->addr);
527
528 /* REVISIT: Could the STB bit of I2C_CON be used with probing? */
529 dev->buf = msg->buf;
530 dev->buf_len = msg->len;
531
532 omap_i2c_write_reg(dev, OMAP_I2C_CNT_REG, dev->buf_len);
533
534 /* Clear the FIFO Buffers */
535 w = omap_i2c_read_reg(dev, OMAP_I2C_BUF_REG);
536 w |= OMAP_I2C_BUF_RXFIF_CLR | OMAP_I2C_BUF_TXFIF_CLR;
537 omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, w);
538
539 init_completion(&dev->cmd_complete);
540 dev->cmd_err = 0;
541
542 w = OMAP_I2C_CON_EN | OMAP_I2C_CON_MST | OMAP_I2C_CON_STT;
543
544 /* High speed configuration */
545 if (dev->speed > 400)
546 w |= OMAP_I2C_CON_OPMODE_HS;
547
548 if (msg->flags & I2C_M_TEN)
549 w |= OMAP_I2C_CON_XA;
550 if (!(msg->flags & I2C_M_RD))
551 w |= OMAP_I2C_CON_TRX;
552
553 if (!dev->b_hw && stop)
554 w |= OMAP_I2C_CON_STP;
555
556 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
557
558 /*
559 * Don't write stt and stp together on some hardware.
560 */
561 if (dev->b_hw && stop) {
562 unsigned long delay = jiffies + OMAP_I2C_TIMEOUT;
563 u16 con = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG);
564 while (con & OMAP_I2C_CON_STT) {
565 con = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG);
566
567 /* Let the user know if i2c is in a bad state */
568 if (time_after(jiffies, delay)) {
569 dev_err(dev->dev, "controller timed out "
570 "waiting for start condition to finish\n");
571 return -ETIMEDOUT;
572 }
573 cpu_relax();
574 }
575
576 w |= OMAP_I2C_CON_STP;
577 w &= ~OMAP_I2C_CON_STT;
578 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
579 }
580
581 /*
582 * REVISIT: We should abort the transfer on signals, but the bus goes
583 * into arbitration and we're currently unable to recover from it.
584 */
585 r = wait_for_completion_timeout(&dev->cmd_complete,
586 OMAP_I2C_TIMEOUT);
587 dev->buf_len = 0;
588 if (r < 0)
589 return r;
590 if (r == 0) {
591 dev_err(dev->dev, "controller timed out\n");
592 omap_i2c_init(dev);
593 return -ETIMEDOUT;
594 }
595
596 if (likely(!dev->cmd_err))
597 return 0;
598
599 /* We have an error */
600 if (dev->cmd_err & (OMAP_I2C_STAT_AL | OMAP_I2C_STAT_ROVR |
601 OMAP_I2C_STAT_XUDF)) {
602 omap_i2c_init(dev);
603 return -EIO;
604 }
605
606 if (dev->cmd_err & OMAP_I2C_STAT_NACK) {
607 if (msg->flags & I2C_M_IGNORE_NAK)
608 return 0;
609 if (stop) {
610 w = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG);
611 w |= OMAP_I2C_CON_STP;
612 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
613 }
614 return -EREMOTEIO;
615 }
616 return -EIO;
617 }
618
619
620 /*
621 * Prepare controller for a transaction and call omap_i2c_xfer_msg
622 * to do the work during IRQ processing.
623 */
624 static int
625 omap_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
626 {
627 struct omap_i2c_dev *dev = i2c_get_adapdata(adap);
628 int i;
629 int r;
630
631 pm_runtime_get_sync(dev->dev);
632
633 r = omap_i2c_wait_for_bb(dev);
634 if (r < 0)
635 goto out;
636
637 if (dev->set_mpu_wkup_lat != NULL)
638 dev->set_mpu_wkup_lat(dev->dev, dev->latency);
639
640 for (i = 0; i < num; i++) {
641 r = omap_i2c_xfer_msg(adap, &msgs[i], (i == (num - 1)));
642 if (r != 0)
643 break;
644 }
645
646 if (dev->set_mpu_wkup_lat != NULL)
647 dev->set_mpu_wkup_lat(dev->dev, -1);
648
649 if (r == 0)
650 r = num;
651
652 omap_i2c_wait_for_bb(dev);
653 out:
654 pm_runtime_put(dev->dev);
655 return r;
656 }
657
658 static u32
659 omap_i2c_func(struct i2c_adapter *adap)
660 {
661 return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
662 }
663
664 static inline void
665 omap_i2c_complete_cmd(struct omap_i2c_dev *dev, u16 err)
666 {
667 dev->cmd_err |= err;
668 complete(&dev->cmd_complete);
669 }
670
671 static inline void
672 omap_i2c_ack_stat(struct omap_i2c_dev *dev, u16 stat)
673 {
674 omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat);
675 }
676
677 static inline void i2c_omap_errata_i207(struct omap_i2c_dev *dev, u16 stat)
678 {
679 /*
680 * I2C Errata(Errata Nos. OMAP2: 1.67, OMAP3: 1.8)
681 * Not applicable for OMAP4.
682 * Under certain rare conditions, RDR could be set again
683 * when the bus is busy, then ignore the interrupt and
684 * clear the interrupt.
685 */
686 if (stat & OMAP_I2C_STAT_RDR) {
687 /* Step 1: If RDR is set, clear it */
688 omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RDR);
689
690 /* Step 2: */
691 if (!(omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG)
692 & OMAP_I2C_STAT_BB)) {
693
694 /* Step 3: */
695 if (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG)
696 & OMAP_I2C_STAT_RDR) {
697 omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RDR);
698 dev_dbg(dev->dev, "RDR when bus is busy.\n");
699 }
700
701 }
702 }
703 }
704
705 /* rev1 devices are apparently only on some 15xx */
706 #ifdef CONFIG_ARCH_OMAP15XX
707
708 static irqreturn_t
709 omap_i2c_omap1_isr(int this_irq, void *dev_id)
710 {
711 struct omap_i2c_dev *dev = dev_id;
712 u16 iv, w;
713
714 if (pm_runtime_suspended(dev->dev))
715 return IRQ_NONE;
716
717 iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG);
718 switch (iv) {
719 case 0x00: /* None */
720 break;
721 case 0x01: /* Arbitration lost */
722 dev_err(dev->dev, "Arbitration lost\n");
723 omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_AL);
724 break;
725 case 0x02: /* No acknowledgement */
726 omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_NACK);
727 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_STP);
728 break;
729 case 0x03: /* Register access ready */
730 omap_i2c_complete_cmd(dev, 0);
731 break;
732 case 0x04: /* Receive data ready */
733 if (dev->buf_len) {
734 w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG);
735 *dev->buf++ = w;
736 dev->buf_len--;
737 if (dev->buf_len) {
738 *dev->buf++ = w >> 8;
739 dev->buf_len--;
740 }
741 } else
742 dev_err(dev->dev, "RRDY IRQ while no data requested\n");
743 break;
744 case 0x05: /* Transmit data ready */
745 if (dev->buf_len) {
746 w = *dev->buf++;
747 dev->buf_len--;
748 if (dev->buf_len) {
749 w |= *dev->buf++ << 8;
750 dev->buf_len--;
751 }
752 omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w);
753 } else
754 dev_err(dev->dev, "XRDY IRQ while no data to send\n");
755 break;
756 default:
757 return IRQ_NONE;
758 }
759
760 return IRQ_HANDLED;
761 }
762 #else
763 #define omap_i2c_omap1_isr NULL
764 #endif
765
766 /*
767 * OMAP3430 Errata 1.153: When an XRDY/XDR is hit, wait for XUDF before writing
768 * data to DATA_REG. Otherwise some data bytes can be lost while transferring
769 * them from the memory to the I2C interface.
770 */
771 static int errata_omap3_1p153(struct omap_i2c_dev *dev, u16 *stat, int *err)
772 {
773 unsigned long timeout = 10000;
774
775 while (--timeout && !(*stat & OMAP_I2C_STAT_XUDF)) {
776 if (*stat & (OMAP_I2C_STAT_NACK | OMAP_I2C_STAT_AL)) {
777 omap_i2c_ack_stat(dev, *stat & (OMAP_I2C_STAT_XRDY |
778 OMAP_I2C_STAT_XDR));
779 *err |= OMAP_I2C_STAT_XUDF;
780 return -ETIMEDOUT;
781 }
782
783 cpu_relax();
784 *stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG);
785 }
786
787 if (!timeout) {
788 dev_err(dev->dev, "timeout waiting on XUDF bit\n");
789 return 0;
790 }
791
792 return 0;
793 }
794
795 static irqreturn_t
796 omap_i2c_isr(int this_irq, void *dev_id)
797 {
798 struct omap_i2c_dev *dev = dev_id;
799 u16 bits;
800 u16 stat, w;
801 int err, count = 0;
802
803 if (pm_runtime_suspended(dev->dev))
804 return IRQ_NONE;
805
806 bits = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
807 while ((stat = (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG))) & bits) {
808 dev_dbg(dev->dev, "IRQ (ISR = 0x%04x)\n", stat);
809 if (count++ == 100) {
810 dev_warn(dev->dev, "Too much work in one IRQ\n");
811 break;
812 }
813
814 err = 0;
815 complete:
816 /*
817 * Ack the stat in one go, but [R/X]DR and [R/X]RDY should be
818 * acked after the data operation is complete.
819 * Ref: TRM SWPU114Q Figure 18-31
820 */
821 omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat &
822 ~(OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR |
823 OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR));
824
825 if (stat & OMAP_I2C_STAT_NACK)
826 err |= OMAP_I2C_STAT_NACK;
827
828 if (stat & OMAP_I2C_STAT_AL) {
829 dev_err(dev->dev, "Arbitration lost\n");
830 err |= OMAP_I2C_STAT_AL;
831 }
832 /*
833 * ProDB0017052: Clear ARDY bit twice
834 */
835 if (stat & (OMAP_I2C_STAT_ARDY | OMAP_I2C_STAT_NACK |
836 OMAP_I2C_STAT_AL)) {
837 omap_i2c_ack_stat(dev, stat &
838 (OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR |
839 OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR |
840 OMAP_I2C_STAT_ARDY));
841 omap_i2c_complete_cmd(dev, err);
842 return IRQ_HANDLED;
843 }
844 if (stat & (OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR)) {
845 u8 num_bytes = 1;
846
847 if (dev->errata & I2C_OMAP_ERRATA_I207)
848 i2c_omap_errata_i207(dev, stat);
849
850 if (dev->fifo_size) {
851 if (stat & OMAP_I2C_STAT_RRDY)
852 num_bytes = dev->fifo_size;
853 else /* read RXSTAT on RDR interrupt */
854 num_bytes = (omap_i2c_read_reg(dev,
855 OMAP_I2C_BUFSTAT_REG)
856 >> 8) & 0x3F;
857 }
858 while (num_bytes) {
859 num_bytes--;
860 w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG);
861 if (dev->buf_len) {
862 *dev->buf++ = w;
863 dev->buf_len--;
864 /*
865 * Data reg in 2430, omap3 and
866 * omap4 is 8 bit wide
867 */
868 if (dev->flags &
869 OMAP_I2C_FLAG_16BIT_DATA_REG) {
870 if (dev->buf_len) {
871 *dev->buf++ = w >> 8;
872 dev->buf_len--;
873 }
874 }
875 } else {
876 if (stat & OMAP_I2C_STAT_RRDY)
877 dev_err(dev->dev,
878 "RRDY IRQ while no data"
879 " requested\n");
880 if (stat & OMAP_I2C_STAT_RDR)
881 dev_err(dev->dev,
882 "RDR IRQ while no data"
883 " requested\n");
884 break;
885 }
886 }
887 omap_i2c_ack_stat(dev,
888 stat & (OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR));
889 continue;
890 }
891 if (stat & (OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR)) {
892 u8 num_bytes = 1;
893 if (dev->fifo_size) {
894 if (stat & OMAP_I2C_STAT_XRDY)
895 num_bytes = dev->fifo_size;
896 else /* read TXSTAT on XDR interrupt */
897 num_bytes = omap_i2c_read_reg(dev,
898 OMAP_I2C_BUFSTAT_REG)
899 & 0x3F;
900 }
901 while (num_bytes) {
902 num_bytes--;
903 w = 0;
904 if (dev->buf_len) {
905 w = *dev->buf++;
906 dev->buf_len--;
907 /*
908 * Data reg in 2430, omap3 and
909 * omap4 is 8 bit wide
910 */
911 if (dev->flags &
912 OMAP_I2C_FLAG_16BIT_DATA_REG) {
913 if (dev->buf_len) {
914 w |= *dev->buf++ << 8;
915 dev->buf_len--;
916 }
917 }
918 } else {
919 if (stat & OMAP_I2C_STAT_XRDY)
920 dev_err(dev->dev,
921 "XRDY IRQ while no "
922 "data to send\n");
923 if (stat & OMAP_I2C_STAT_XDR)
924 dev_err(dev->dev,
925 "XDR IRQ while no "
926 "data to send\n");
927 break;
928 }
929
930 if ((dev->errata & I2C_OMAP3_1P153) &&
931 errata_omap3_1p153(dev, &stat, &err))
932 goto complete;
933
934 omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w);
935 }
936 omap_i2c_ack_stat(dev,
937 stat & (OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR));
938 continue;
939 }
940 if (stat & OMAP_I2C_STAT_ROVR) {
941 dev_err(dev->dev, "Receive overrun\n");
942 dev->cmd_err |= OMAP_I2C_STAT_ROVR;
943 }
944 if (stat & OMAP_I2C_STAT_XUDF) {
945 dev_err(dev->dev, "Transmit underflow\n");
946 dev->cmd_err |= OMAP_I2C_STAT_XUDF;
947 }
948 }
949
950 return count ? IRQ_HANDLED : IRQ_NONE;
951 }
952
953 static const struct i2c_algorithm omap_i2c_algo = {
954 .master_xfer = omap_i2c_xfer,
955 .functionality = omap_i2c_func,
956 };
957
958 #ifdef CONFIG_OF
959 static struct omap_i2c_bus_platform_data omap3_pdata = {
960 .rev = OMAP_I2C_IP_VERSION_1,
961 .flags = OMAP_I2C_FLAG_APPLY_ERRATA_I207 |
962 OMAP_I2C_FLAG_RESET_REGS_POSTIDLE |
963 OMAP_I2C_FLAG_BUS_SHIFT_2,
964 };
965
966 static struct omap_i2c_bus_platform_data omap4_pdata = {
967 .rev = OMAP_I2C_IP_VERSION_2,
968 };
969
970 static const struct of_device_id omap_i2c_of_match[] = {
971 {
972 .compatible = "ti,omap4-i2c",
973 .data = &omap4_pdata,
974 },
975 {
976 .compatible = "ti,omap3-i2c",
977 .data = &omap3_pdata,
978 },
979 { },
980 };
981 MODULE_DEVICE_TABLE(of, omap_i2c_of_match);
982 #endif
983
984 static int __devinit
985 omap_i2c_probe(struct platform_device *pdev)
986 {
987 struct omap_i2c_dev *dev;
988 struct i2c_adapter *adap;
989 struct resource *mem, *irq, *ioarea;
990 struct omap_i2c_bus_platform_data *pdata = pdev->dev.platform_data;
991 struct device_node *node = pdev->dev.of_node;
992 const struct of_device_id *match;
993 irq_handler_t isr;
994 int r;
995
996 /* NOTE: driver uses the static register mapping */
997 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
998 if (!mem) {
999 dev_err(&pdev->dev, "no mem resource?\n");
1000 return -ENODEV;
1001 }
1002 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1003 if (!irq) {
1004 dev_err(&pdev->dev, "no irq resource?\n");
1005 return -ENODEV;
1006 }
1007
1008 ioarea = request_mem_region(mem->start, resource_size(mem),
1009 pdev->name);
1010 if (!ioarea) {
1011 dev_err(&pdev->dev, "I2C region already claimed\n");
1012 return -EBUSY;
1013 }
1014
1015 dev = kzalloc(sizeof(struct omap_i2c_dev), GFP_KERNEL);
1016 if (!dev) {
1017 r = -ENOMEM;
1018 goto err_release_region;
1019 }
1020
1021 match = of_match_device(omap_i2c_of_match, &pdev->dev);
1022 if (match) {
1023 u32 freq = 100000; /* default to 100000 Hz */
1024
1025 pdata = match->data;
1026 dev->dtrev = pdata->rev;
1027 dev->flags = pdata->flags;
1028
1029 of_property_read_u32(node, "clock-frequency", &freq);
1030 /* convert DT freq value in Hz into kHz for speed */
1031 dev->speed = freq / 1000;
1032 } else if (pdata != NULL) {
1033 dev->speed = pdata->clkrate;
1034 dev->flags = pdata->flags;
1035 dev->set_mpu_wkup_lat = pdata->set_mpu_wkup_lat;
1036 dev->dtrev = pdata->rev;
1037 }
1038
1039 dev->dev = &pdev->dev;
1040 dev->irq = irq->start;
1041 dev->base = ioremap(mem->start, resource_size(mem));
1042 if (!dev->base) {
1043 r = -ENOMEM;
1044 goto err_free_mem;
1045 }
1046
1047 platform_set_drvdata(pdev, dev);
1048
1049 dev->reg_shift = (dev->flags >> OMAP_I2C_FLAG_BUS_SHIFT__SHIFT) & 3;
1050
1051 if (dev->dtrev == OMAP_I2C_IP_VERSION_2)
1052 dev->regs = (u8 *)reg_map_ip_v2;
1053 else
1054 dev->regs = (u8 *)reg_map_ip_v1;
1055
1056 pm_runtime_enable(dev->dev);
1057 pm_runtime_get_sync(dev->dev);
1058
1059 dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff;
1060
1061 if (dev->rev <= OMAP_I2C_REV_ON_3430)
1062 dev->errata |= I2C_OMAP3_1P153;
1063
1064 if (!(dev->flags & OMAP_I2C_FLAG_NO_FIFO)) {
1065 u16 s;
1066
1067 /* Set up the fifo size - Get total size */
1068 s = (omap_i2c_read_reg(dev, OMAP_I2C_BUFSTAT_REG) >> 14) & 0x3;
1069 dev->fifo_size = 0x8 << s;
1070
1071 /*
1072 * Set up notification threshold as half the total available
1073 * size. This is to ensure that we can handle the status on int
1074 * call back latencies.
1075 */
1076
1077 dev->fifo_size = (dev->fifo_size / 2);
1078
1079 if (dev->rev >= OMAP_I2C_REV_ON_3530_4430)
1080 dev->b_hw = 0; /* Disable hardware fixes */
1081 else
1082 dev->b_hw = 1; /* Enable hardware fixes */
1083
1084 /* calculate wakeup latency constraint for MPU */
1085 if (dev->set_mpu_wkup_lat != NULL)
1086 dev->latency = (1000000 * dev->fifo_size) /
1087 (1000 * dev->speed / 8);
1088 }
1089
1090 /* reset ASAP, clearing any IRQs */
1091 omap_i2c_init(dev);
1092
1093 isr = (dev->rev < OMAP_I2C_OMAP1_REV_2) ? omap_i2c_omap1_isr :
1094 omap_i2c_isr;
1095 r = request_irq(dev->irq, isr, 0, pdev->name, dev);
1096
1097 if (r) {
1098 dev_err(dev->dev, "failure requesting irq %i\n", dev->irq);
1099 goto err_unuse_clocks;
1100 }
1101
1102 dev_info(dev->dev, "bus %d rev%d.%d.%d at %d kHz\n", pdev->id,
1103 dev->dtrev, dev->rev >> 4, dev->rev & 0xf, dev->speed);
1104
1105 pm_runtime_put(dev->dev);
1106
1107 adap = &dev->adapter;
1108 i2c_set_adapdata(adap, dev);
1109 adap->owner = THIS_MODULE;
1110 adap->class = I2C_CLASS_HWMON;
1111 strlcpy(adap->name, "OMAP I2C adapter", sizeof(adap->name));
1112 adap->algo = &omap_i2c_algo;
1113 adap->dev.parent = &pdev->dev;
1114 adap->dev.of_node = pdev->dev.of_node;
1115
1116 /* i2c device drivers may be active on return from add_adapter() */
1117 adap->nr = pdev->id;
1118 r = i2c_add_numbered_adapter(adap);
1119 if (r) {
1120 dev_err(dev->dev, "failure adding adapter\n");
1121 goto err_free_irq;
1122 }
1123
1124 of_i2c_register_devices(adap);
1125
1126 return 0;
1127
1128 err_free_irq:
1129 free_irq(dev->irq, dev);
1130 err_unuse_clocks:
1131 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
1132 pm_runtime_put(dev->dev);
1133 iounmap(dev->base);
1134 err_free_mem:
1135 platform_set_drvdata(pdev, NULL);
1136 kfree(dev);
1137 err_release_region:
1138 release_mem_region(mem->start, resource_size(mem));
1139
1140 return r;
1141 }
1142
1143 static int
1144 omap_i2c_remove(struct platform_device *pdev)
1145 {
1146 struct omap_i2c_dev *dev = platform_get_drvdata(pdev);
1147 struct resource *mem;
1148
1149 platform_set_drvdata(pdev, NULL);
1150
1151 free_irq(dev->irq, dev);
1152 i2c_del_adapter(&dev->adapter);
1153 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
1154 iounmap(dev->base);
1155 kfree(dev);
1156 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1157 release_mem_region(mem->start, resource_size(mem));
1158 return 0;
1159 }
1160
1161 #ifdef CONFIG_PM_RUNTIME
1162 static int omap_i2c_runtime_suspend(struct device *dev)
1163 {
1164 struct platform_device *pdev = to_platform_device(dev);
1165 struct omap_i2c_dev *_dev = platform_get_drvdata(pdev);
1166
1167 omap_i2c_idle(_dev);
1168
1169 return 0;
1170 }
1171
1172 static int omap_i2c_runtime_resume(struct device *dev)
1173 {
1174 struct platform_device *pdev = to_platform_device(dev);
1175 struct omap_i2c_dev *_dev = platform_get_drvdata(pdev);
1176
1177 omap_i2c_unidle(_dev);
1178
1179 return 0;
1180 }
1181
1182 static struct dev_pm_ops omap_i2c_pm_ops = {
1183 .runtime_suspend = omap_i2c_runtime_suspend,
1184 .runtime_resume = omap_i2c_runtime_resume,
1185 };
1186 #define OMAP_I2C_PM_OPS (&omap_i2c_pm_ops)
1187 #else
1188 #define OMAP_I2C_PM_OPS NULL
1189 #endif
1190
1191 static struct platform_driver omap_i2c_driver = {
1192 .probe = omap_i2c_probe,
1193 .remove = omap_i2c_remove,
1194 .driver = {
1195 .name = "omap_i2c",
1196 .owner = THIS_MODULE,
1197 .pm = OMAP_I2C_PM_OPS,
1198 .of_match_table = of_match_ptr(omap_i2c_of_match),
1199 },
1200 };
1201
1202 /* I2C may be needed to bring up other drivers */
1203 static int __init
1204 omap_i2c_init_driver(void)
1205 {
1206 return platform_driver_register(&omap_i2c_driver);
1207 }
1208 subsys_initcall(omap_i2c_init_driver);
1209
1210 static void __exit omap_i2c_exit_driver(void)
1211 {
1212 platform_driver_unregister(&omap_i2c_driver);
1213 }
1214 module_exit(omap_i2c_exit_driver);
1215
1216 MODULE_AUTHOR("MontaVista Software, Inc. (and others)");
1217 MODULE_DESCRIPTION("TI OMAP I2C bus adapter");
1218 MODULE_LICENSE("GPL");
1219 MODULE_ALIAS("platform:omap_i2c");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree