Commit | Line | Data |
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95a7f10e VB |
1 | /* |
2 | * TI DAVINCI I2C adapter driver. | |
3 | * | |
4 | * Copyright (C) 2006 Texas Instruments. | |
5 | * Copyright (C) 2007 MontaVista Software Inc. | |
6 | * | |
7 | * Updated by Vinod & Sudhakar Feb 2005 | |
8 | * | |
9 | * ---------------------------------------------------------------------------- | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
95a7f10e VB |
20 | * ---------------------------------------------------------------------------- |
21 | * | |
22 | */ | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/delay.h> | |
26 | #include <linux/i2c.h> | |
27 | #include <linux/clk.h> | |
28 | #include <linux/errno.h> | |
29 | #include <linux/sched.h> | |
30 | #include <linux/err.h> | |
31 | #include <linux/interrupt.h> | |
32 | #include <linux/platform_device.h> | |
33 | #include <linux/io.h> | |
5a0e3ad6 | 34 | #include <linux/slab.h> |
82c0de11 | 35 | #include <linux/cpufreq.h> |
e5353765 | 36 | #include <linux/gpio/consumer.h> |
5c3d8a46 | 37 | #include <linux/of_device.h> |
ec2a0833 | 38 | #include <linux/platform_data/i2c-davinci.h> |
17f88151 | 39 | #include <linux/pm_runtime.h> |
95a7f10e VB |
40 | |
41 | /* ----- global defines ----------------------------------------------- */ | |
42 | ||
43 | #define DAVINCI_I2C_TIMEOUT (1*HZ) | |
8574faf9 | 44 | #define DAVINCI_I2C_MAX_TRIES 2 |
41c8d452 AS |
45 | #define DAVINCI_I2C_OWN_ADDRESS 0x08 |
46 | #define I2C_DAVINCI_INTR_ALL (DAVINCI_I2C_IMR_SCD | \ | |
95a7f10e VB |
47 | DAVINCI_I2C_IMR_ARDY | \ |
48 | DAVINCI_I2C_IMR_NACK | \ | |
49 | DAVINCI_I2C_IMR_AL) | |
50 | ||
51 | #define DAVINCI_I2C_OAR_REG 0x00 | |
52 | #define DAVINCI_I2C_IMR_REG 0x04 | |
53 | #define DAVINCI_I2C_STR_REG 0x08 | |
54 | #define DAVINCI_I2C_CLKL_REG 0x0c | |
55 | #define DAVINCI_I2C_CLKH_REG 0x10 | |
56 | #define DAVINCI_I2C_CNT_REG 0x14 | |
57 | #define DAVINCI_I2C_DRR_REG 0x18 | |
58 | #define DAVINCI_I2C_SAR_REG 0x1c | |
59 | #define DAVINCI_I2C_DXR_REG 0x20 | |
60 | #define DAVINCI_I2C_MDR_REG 0x24 | |
61 | #define DAVINCI_I2C_IVR_REG 0x28 | |
62 | #define DAVINCI_I2C_EMDR_REG 0x2c | |
63 | #define DAVINCI_I2C_PSC_REG 0x30 | |
7ef97e9a GS |
64 | #define DAVINCI_I2C_FUNC_REG 0x48 |
65 | #define DAVINCI_I2C_DIR_REG 0x4c | |
66 | #define DAVINCI_I2C_DIN_REG 0x50 | |
67 | #define DAVINCI_I2C_DOUT_REG 0x54 | |
68 | #define DAVINCI_I2C_DSET_REG 0x58 | |
69 | #define DAVINCI_I2C_DCLR_REG 0x5c | |
95a7f10e VB |
70 | |
71 | #define DAVINCI_I2C_IVR_AAS 0x07 | |
72 | #define DAVINCI_I2C_IVR_SCD 0x06 | |
73 | #define DAVINCI_I2C_IVR_XRDY 0x05 | |
74 | #define DAVINCI_I2C_IVR_RDR 0x04 | |
75 | #define DAVINCI_I2C_IVR_ARDY 0x03 | |
76 | #define DAVINCI_I2C_IVR_NACK 0x02 | |
77 | #define DAVINCI_I2C_IVR_AL 0x01 | |
78 | ||
c062a251 C |
79 | #define DAVINCI_I2C_STR_BB BIT(12) |
80 | #define DAVINCI_I2C_STR_RSFULL BIT(11) | |
81 | #define DAVINCI_I2C_STR_SCD BIT(5) | |
82 | #define DAVINCI_I2C_STR_ARDY BIT(2) | |
83 | #define DAVINCI_I2C_STR_NACK BIT(1) | |
84 | #define DAVINCI_I2C_STR_AL BIT(0) | |
85 | ||
86 | #define DAVINCI_I2C_MDR_NACK BIT(15) | |
87 | #define DAVINCI_I2C_MDR_STT BIT(13) | |
88 | #define DAVINCI_I2C_MDR_STP BIT(11) | |
89 | #define DAVINCI_I2C_MDR_MST BIT(10) | |
90 | #define DAVINCI_I2C_MDR_TRX BIT(9) | |
91 | #define DAVINCI_I2C_MDR_XA BIT(8) | |
92 | #define DAVINCI_I2C_MDR_RM BIT(7) | |
93 | #define DAVINCI_I2C_MDR_IRS BIT(5) | |
94 | ||
95 | #define DAVINCI_I2C_IMR_AAS BIT(6) | |
96 | #define DAVINCI_I2C_IMR_SCD BIT(5) | |
97 | #define DAVINCI_I2C_IMR_XRDY BIT(4) | |
98 | #define DAVINCI_I2C_IMR_RRDY BIT(3) | |
99 | #define DAVINCI_I2C_IMR_ARDY BIT(2) | |
100 | #define DAVINCI_I2C_IMR_NACK BIT(1) | |
101 | #define DAVINCI_I2C_IMR_AL BIT(0) | |
95a7f10e | 102 | |
7ef97e9a GS |
103 | /* set SDA and SCL as GPIO */ |
104 | #define DAVINCI_I2C_FUNC_PFUNC0 BIT(0) | |
105 | ||
106 | /* set SCL as output when used as GPIO*/ | |
107 | #define DAVINCI_I2C_DIR_PDIR0 BIT(0) | |
108 | /* set SDA as output when used as GPIO*/ | |
109 | #define DAVINCI_I2C_DIR_PDIR1 BIT(1) | |
110 | ||
111 | /* read SCL GPIO level */ | |
112 | #define DAVINCI_I2C_DIN_PDIN0 BIT(0) | |
113 | /* read SDA GPIO level */ | |
114 | #define DAVINCI_I2C_DIN_PDIN1 BIT(1) | |
115 | ||
116 | /*set the SCL GPIO high */ | |
117 | #define DAVINCI_I2C_DSET_PDSET0 BIT(0) | |
118 | /*set the SDA GPIO high */ | |
119 | #define DAVINCI_I2C_DSET_PDSET1 BIT(1) | |
120 | ||
121 | /* set the SCL GPIO low */ | |
122 | #define DAVINCI_I2C_DCLR_PDCLR0 BIT(0) | |
123 | /* set the SDA GPIO low */ | |
124 | #define DAVINCI_I2C_DCLR_PDCLR1 BIT(1) | |
125 | ||
17f88151 FCJ |
126 | /* timeout for pm runtime autosuspend */ |
127 | #define DAVINCI_I2C_PM_TIMEOUT 1000 /* ms */ | |
128 | ||
95a7f10e VB |
129 | struct davinci_i2c_dev { |
130 | struct device *dev; | |
131 | void __iomem *base; | |
132 | struct completion cmd_complete; | |
133 | struct clk *clk; | |
134 | int cmd_err; | |
135 | u8 *buf; | |
136 | size_t buf_len; | |
137 | int irq; | |
c6c7c729 | 138 | int stop; |
5a0d5f5f | 139 | u8 terminate; |
95a7f10e | 140 | struct i2c_adapter adapter; |
82c0de11 | 141 | #ifdef CONFIG_CPU_FREQ |
82c0de11 C |
142 | struct notifier_block freq_transition; |
143 | #endif | |
5c3d8a46 | 144 | struct davinci_i2c_platform_data *pdata; |
95a7f10e VB |
145 | }; |
146 | ||
147 | /* default platform data to use if not supplied in the platform_device */ | |
148 | static struct davinci_i2c_platform_data davinci_i2c_platform_data_default = { | |
149 | .bus_freq = 100, | |
150 | .bus_delay = 0, | |
151 | }; | |
152 | ||
153 | static inline void davinci_i2c_write_reg(struct davinci_i2c_dev *i2c_dev, | |
154 | int reg, u16 val) | |
155 | { | |
a238dcfa | 156 | writew_relaxed(val, i2c_dev->base + reg); |
95a7f10e VB |
157 | } |
158 | ||
159 | static inline u16 davinci_i2c_read_reg(struct davinci_i2c_dev *i2c_dev, int reg) | |
160 | { | |
a238dcfa | 161 | return readw_relaxed(i2c_dev->base + reg); |
95a7f10e VB |
162 | } |
163 | ||
5ae5b113 C |
164 | static inline void davinci_i2c_reset_ctrl(struct davinci_i2c_dev *i2c_dev, |
165 | int val) | |
166 | { | |
167 | u16 w; | |
168 | ||
169 | w = davinci_i2c_read_reg(i2c_dev, DAVINCI_I2C_MDR_REG); | |
170 | if (!val) /* put I2C into reset */ | |
171 | w &= ~DAVINCI_I2C_MDR_IRS; | |
172 | else /* take I2C out of reset */ | |
173 | w |= DAVINCI_I2C_MDR_IRS; | |
174 | ||
175 | davinci_i2c_write_reg(i2c_dev, DAVINCI_I2C_MDR_REG, w); | |
176 | } | |
177 | ||
178 | static void i2c_davinci_calc_clk_dividers(struct davinci_i2c_dev *dev) | |
95a7f10e | 179 | { |
5c3d8a46 | 180 | struct davinci_i2c_platform_data *pdata = dev->pdata; |
95a7f10e VB |
181 | u16 psc; |
182 | u32 clk; | |
cc99ff70 | 183 | u32 d; |
95a7f10e VB |
184 | u32 clkh; |
185 | u32 clkl; | |
186 | u32 input_clock = clk_get_rate(dev->clk); | |
35780e86 | 187 | struct device_node *of_node = dev->dev->of_node; |
95a7f10e VB |
188 | |
189 | /* NOTE: I2C Clock divider programming info | |
190 | * As per I2C specs the following formulas provide prescaler | |
191 | * and low/high divider values | |
192 | * input clk --> PSC Div -----------> ICCL/H Div --> output clock | |
193 | * module clk | |
194 | * | |
195 | * output clk = module clk / (PSC + 1) [ (ICCL + d) + (ICCH + d) ] | |
196 | * | |
197 | * Thus, | |
198 | * (ICCL + ICCH) = clk = (input clk / ((psc +1) * output clk)) - 2d; | |
199 | * | |
200 | * where if PSC == 0, d = 7, | |
201 | * if PSC == 1, d = 6 | |
202 | * if PSC > 1 , d = 5 | |
35780e86 AS |
203 | * |
204 | * Note: | |
205 | * d is always 6 on Keystone I2C controller | |
95a7f10e VB |
206 | */ |
207 | ||
87cb5b42 AS |
208 | /* |
209 | * Both Davinci and current Keystone User Guides recommend a value | |
210 | * between 7MHz and 12MHz. In reality 7MHz module clock doesn't | |
211 | * always produce enough margin between SDA and SCL transitions. | |
212 | * Measurements show that the higher the module clock is, the | |
213 | * bigger is the margin, providing more reliable communication. | |
214 | * So we better target for 12MHz. | |
215 | */ | |
216 | psc = (input_clock / 12000000) - 1; | |
cc99ff70 TK |
217 | if ((input_clock / (psc + 1)) > 12000000) |
218 | psc++; /* better to run under spec than over */ | |
219 | d = (psc >= 2) ? 5 : 7 - psc; | |
95a7f10e | 220 | |
35780e86 AS |
221 | if (of_node && of_device_is_compatible(of_node, "ti,keystone-i2c")) |
222 | d = 6; | |
223 | ||
955fc950 AS |
224 | clk = ((input_clock / (psc + 1)) / (pdata->bus_freq * 1000)); |
225 | /* Avoid driving the bus too fast because of rounding errors above */ | |
226 | if (input_clock / (psc + 1) / clk > pdata->bus_freq * 1000) | |
227 | clk++; | |
228 | /* | |
229 | * According to I2C-BUS Spec 2.1, in FAST-MODE LOW period should be at | |
230 | * least 1.3uS, which is not the case with 50% duty cycle. Driving HIGH | |
231 | * to LOW ratio as 1 to 2 is more safe. | |
232 | */ | |
233 | if (pdata->bus_freq > 100) | |
234 | clkl = (clk << 1) / 3; | |
235 | else | |
236 | clkl = (clk >> 1); | |
237 | /* | |
238 | * It's not always possible to have 1 to 2 ratio when d=7, so fall back | |
239 | * to minimal possible clkh in this case. | |
cc8de9a6 AS |
240 | * |
241 | * Note: | |
242 | * CLKH is not allowed to be 0, in this case I2C clock is not generated | |
243 | * at all | |
955fc950 | 244 | */ |
cc8de9a6 | 245 | if (clk > clkl + d) { |
955fc950 AS |
246 | clkh = clk - clkl - d; |
247 | clkl -= d; | |
248 | } else { | |
cc8de9a6 | 249 | clkh = 1; |
955fc950 AS |
250 | clkl = clk - (d << 1); |
251 | } | |
95a7f10e VB |
252 | |
253 | davinci_i2c_write_reg(dev, DAVINCI_I2C_PSC_REG, psc); | |
254 | davinci_i2c_write_reg(dev, DAVINCI_I2C_CLKH_REG, clkh); | |
255 | davinci_i2c_write_reg(dev, DAVINCI_I2C_CLKL_REG, clkl); | |
256 | ||
5ae5b113 C |
257 | dev_dbg(dev->dev, "input_clock = %d, CLK = %d\n", input_clock, clk); |
258 | } | |
259 | ||
260 | /* | |
261 | * This function configures I2C and brings I2C out of reset. | |
262 | * This function is called during I2C init function. This function | |
263 | * also gets called if I2C encounters any errors. | |
264 | */ | |
265 | static int i2c_davinci_init(struct davinci_i2c_dev *dev) | |
266 | { | |
5c3d8a46 | 267 | struct davinci_i2c_platform_data *pdata = dev->pdata; |
5ae5b113 C |
268 | |
269 | /* put I2C into reset */ | |
270 | davinci_i2c_reset_ctrl(dev, 0); | |
271 | ||
272 | /* compute clock dividers */ | |
273 | i2c_davinci_calc_clk_dividers(dev); | |
274 | ||
7605fa3b DB |
275 | /* Respond at reserved "SMBus Host" slave address" (and zero); |
276 | * we seem to have no option to not respond... | |
277 | */ | |
41c8d452 | 278 | davinci_i2c_write_reg(dev, DAVINCI_I2C_OAR_REG, DAVINCI_I2C_OWN_ADDRESS); |
7605fa3b | 279 | |
95a7f10e VB |
280 | dev_dbg(dev->dev, "PSC = %d\n", |
281 | davinci_i2c_read_reg(dev, DAVINCI_I2C_PSC_REG)); | |
282 | dev_dbg(dev->dev, "CLKL = %d\n", | |
283 | davinci_i2c_read_reg(dev, DAVINCI_I2C_CLKL_REG)); | |
284 | dev_dbg(dev->dev, "CLKH = %d\n", | |
285 | davinci_i2c_read_reg(dev, DAVINCI_I2C_CLKH_REG)); | |
cc99ff70 TK |
286 | dev_dbg(dev->dev, "bus_freq = %dkHz, bus_delay = %d\n", |
287 | pdata->bus_freq, pdata->bus_delay); | |
95a7f10e | 288 | |
5c3d8a46 | 289 | |
95a7f10e | 290 | /* Take the I2C module out of reset: */ |
5ae5b113 | 291 | davinci_i2c_reset_ctrl(dev, 1); |
95a7f10e VB |
292 | |
293 | /* Enable interrupts */ | |
294 | davinci_i2c_write_reg(dev, DAVINCI_I2C_IMR_REG, I2C_DAVINCI_INTR_ALL); | |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
2e65676f | 299 | /* |
cd2428c3 | 300 | * This routine does i2c bus recovery by using i2c_generic_scl_recovery |
2e65676f GS |
301 | * which is provided by I2C Bus recovery infrastructure. |
302 | */ | |
303 | static void davinci_i2c_prepare_recovery(struct i2c_adapter *adap) | |
304 | { | |
305 | struct davinci_i2c_dev *dev = i2c_get_adapdata(adap); | |
306 | ||
307 | /* Disable interrupts */ | |
308 | davinci_i2c_write_reg(dev, DAVINCI_I2C_IMR_REG, 0); | |
309 | ||
310 | /* put I2C into reset */ | |
311 | davinci_i2c_reset_ctrl(dev, 0); | |
312 | } | |
313 | ||
314 | static void davinci_i2c_unprepare_recovery(struct i2c_adapter *adap) | |
315 | { | |
316 | struct davinci_i2c_dev *dev = i2c_get_adapdata(adap); | |
317 | ||
318 | i2c_davinci_init(dev); | |
319 | } | |
320 | ||
321 | static struct i2c_bus_recovery_info davinci_i2c_gpio_recovery_info = { | |
cd2428c3 | 322 | .recover_bus = i2c_generic_scl_recovery, |
2e65676f GS |
323 | .prepare_recovery = davinci_i2c_prepare_recovery, |
324 | .unprepare_recovery = davinci_i2c_unprepare_recovery, | |
325 | }; | |
326 | ||
7ef97e9a GS |
327 | static void davinci_i2c_set_scl(struct i2c_adapter *adap, int val) |
328 | { | |
329 | struct davinci_i2c_dev *dev = i2c_get_adapdata(adap); | |
330 | ||
331 | if (val) | |
332 | davinci_i2c_write_reg(dev, DAVINCI_I2C_DSET_REG, | |
333 | DAVINCI_I2C_DSET_PDSET0); | |
334 | else | |
335 | davinci_i2c_write_reg(dev, DAVINCI_I2C_DCLR_REG, | |
336 | DAVINCI_I2C_DCLR_PDCLR0); | |
337 | } | |
338 | ||
339 | static int davinci_i2c_get_scl(struct i2c_adapter *adap) | |
340 | { | |
341 | struct davinci_i2c_dev *dev = i2c_get_adapdata(adap); | |
342 | int val; | |
343 | ||
344 | /* read the state of SCL */ | |
345 | val = davinci_i2c_read_reg(dev, DAVINCI_I2C_DIN_REG); | |
346 | return val & DAVINCI_I2C_DIN_PDIN0; | |
347 | } | |
348 | ||
349 | static int davinci_i2c_get_sda(struct i2c_adapter *adap) | |
350 | { | |
351 | struct davinci_i2c_dev *dev = i2c_get_adapdata(adap); | |
352 | int val; | |
353 | ||
354 | /* read the state of SDA */ | |
355 | val = davinci_i2c_read_reg(dev, DAVINCI_I2C_DIN_REG); | |
356 | return val & DAVINCI_I2C_DIN_PDIN1; | |
357 | } | |
358 | ||
359 | static void davinci_i2c_scl_prepare_recovery(struct i2c_adapter *adap) | |
360 | { | |
361 | struct davinci_i2c_dev *dev = i2c_get_adapdata(adap); | |
362 | ||
363 | davinci_i2c_prepare_recovery(adap); | |
364 | ||
365 | /* SCL output, SDA input */ | |
366 | davinci_i2c_write_reg(dev, DAVINCI_I2C_DIR_REG, DAVINCI_I2C_DIR_PDIR0); | |
367 | ||
368 | /* change to GPIO mode */ | |
369 | davinci_i2c_write_reg(dev, DAVINCI_I2C_FUNC_REG, | |
370 | DAVINCI_I2C_FUNC_PFUNC0); | |
371 | } | |
372 | ||
373 | static void davinci_i2c_scl_unprepare_recovery(struct i2c_adapter *adap) | |
374 | { | |
375 | struct davinci_i2c_dev *dev = i2c_get_adapdata(adap); | |
376 | ||
377 | /* change back to I2C mode */ | |
378 | davinci_i2c_write_reg(dev, DAVINCI_I2C_FUNC_REG, 0); | |
379 | ||
380 | davinci_i2c_unprepare_recovery(adap); | |
381 | } | |
382 | ||
383 | static struct i2c_bus_recovery_info davinci_i2c_scl_recovery_info = { | |
384 | .recover_bus = i2c_generic_scl_recovery, | |
385 | .set_scl = davinci_i2c_set_scl, | |
386 | .get_scl = davinci_i2c_get_scl, | |
387 | .get_sda = davinci_i2c_get_sda, | |
388 | .prepare_recovery = davinci_i2c_scl_prepare_recovery, | |
389 | .unprepare_recovery = davinci_i2c_scl_unprepare_recovery, | |
390 | }; | |
391 | ||
95a7f10e VB |
392 | /* |
393 | * Waiting for bus not busy | |
394 | */ | |
72a956c5 | 395 | static int i2c_davinci_wait_bus_not_busy(struct davinci_i2c_dev *dev) |
95a7f10e | 396 | { |
72a956c5 AS |
397 | unsigned long timeout = jiffies + dev->adapter.timeout; |
398 | ||
399 | do { | |
400 | if (!(davinci_i2c_read_reg(dev, DAVINCI_I2C_STR_REG) & DAVINCI_I2C_STR_BB)) | |
401 | return 0; | |
402 | schedule_timeout_uninterruptible(1); | |
403 | } while (time_before_eq(jiffies, timeout)); | |
404 | ||
405 | dev_warn(dev->dev, "timeout waiting for bus ready\n"); | |
406 | i2c_recover_bus(&dev->adapter); | |
407 | ||
408 | /* | |
409 | * if bus is still "busy" here, it's most probably a HW problem like | |
410 | * short-circuit | |
411 | */ | |
412 | if (davinci_i2c_read_reg(dev, DAVINCI_I2C_STR_REG) & DAVINCI_I2C_STR_BB) | |
413 | return -EIO; | |
95a7f10e VB |
414 | |
415 | return 0; | |
416 | } | |
417 | ||
418 | /* | |
419 | * Low level master read/write transaction. This function is called | |
420 | * from i2c_davinci_xfer. | |
421 | */ | |
422 | static int | |
423 | i2c_davinci_xfer_msg(struct i2c_adapter *adap, struct i2c_msg *msg, int stop) | |
424 | { | |
425 | struct davinci_i2c_dev *dev = i2c_get_adapdata(adap); | |
5c3d8a46 | 426 | struct davinci_i2c_platform_data *pdata = dev->pdata; |
95a7f10e | 427 | u32 flag; |
95a7f10e | 428 | u16 w; |
d9e1f441 | 429 | unsigned long time_left; |
95a7f10e | 430 | |
41c8d452 AS |
431 | if (msg->addr == DAVINCI_I2C_OWN_ADDRESS) { |
432 | dev_warn(dev->dev, "transfer to own address aborted\n"); | |
433 | return -EADDRNOTAVAIL; | |
434 | } | |
435 | ||
95a7f10e VB |
436 | /* Introduce a delay, required for some boards (e.g Davinci EVM) */ |
437 | if (pdata->bus_delay) | |
438 | udelay(pdata->bus_delay); | |
439 | ||
440 | /* set the slave address */ | |
441 | davinci_i2c_write_reg(dev, DAVINCI_I2C_SAR_REG, msg->addr); | |
442 | ||
443 | dev->buf = msg->buf; | |
444 | dev->buf_len = msg->len; | |
c6c7c729 | 445 | dev->stop = stop; |
95a7f10e VB |
446 | |
447 | davinci_i2c_write_reg(dev, DAVINCI_I2C_CNT_REG, dev->buf_len); | |
448 | ||
16735d02 | 449 | reinit_completion(&dev->cmd_complete); |
95a7f10e VB |
450 | dev->cmd_err = 0; |
451 | ||
c5b4afec JP |
452 | /* Take I2C out of reset and configure it as master */ |
453 | flag = DAVINCI_I2C_MDR_IRS | DAVINCI_I2C_MDR_MST; | |
95a7f10e VB |
454 | |
455 | /* if the slave address is ten bit address, enable XA bit */ | |
456 | if (msg->flags & I2C_M_TEN) | |
457 | flag |= DAVINCI_I2C_MDR_XA; | |
458 | if (!(msg->flags & I2C_M_RD)) | |
459 | flag |= DAVINCI_I2C_MDR_TRX; | |
c5b4afec | 460 | if (msg->len == 0) |
c6c7c729 | 461 | flag |= DAVINCI_I2C_MDR_RM; |
95a7f10e VB |
462 | |
463 | /* Enable receive or transmit interrupts */ | |
464 | w = davinci_i2c_read_reg(dev, DAVINCI_I2C_IMR_REG); | |
465 | if (msg->flags & I2C_M_RD) | |
c062a251 | 466 | w |= DAVINCI_I2C_IMR_RRDY; |
95a7f10e | 467 | else |
c062a251 | 468 | w |= DAVINCI_I2C_IMR_XRDY; |
95a7f10e VB |
469 | davinci_i2c_write_reg(dev, DAVINCI_I2C_IMR_REG, w); |
470 | ||
5a0d5f5f | 471 | dev->terminate = 0; |
c6c7c729 | 472 | |
c5b4afec JP |
473 | /* |
474 | * Write mode register first as needed for correct behaviour | |
475 | * on OMAP-L138, but don't set STT yet to avoid a race with XRDY | |
25985edc | 476 | * occurring before we have loaded DXR |
c5b4afec JP |
477 | */ |
478 | davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, flag); | |
479 | ||
c6c7c729 DB |
480 | /* |
481 | * First byte should be set here, not after interrupt, | |
482 | * because transmit-data-ready interrupt can come before | |
483 | * NACK-interrupt during sending of previous message and | |
484 | * ICDXR may have wrong data | |
c5b4afec | 485 | * It also saves us one interrupt, slightly faster |
c6c7c729 DB |
486 | */ |
487 | if ((!(msg->flags & I2C_M_RD)) && dev->buf_len) { | |
488 | davinci_i2c_write_reg(dev, DAVINCI_I2C_DXR_REG, *dev->buf++); | |
489 | dev->buf_len--; | |
490 | } | |
491 | ||
c5b4afec JP |
492 | /* Set STT to begin transmit now DXR is loaded */ |
493 | flag |= DAVINCI_I2C_MDR_STT; | |
494 | if (stop && msg->len != 0) | |
495 | flag |= DAVINCI_I2C_MDR_STP; | |
4bba0fd8 JP |
496 | davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, flag); |
497 | ||
d9e1f441 NMG |
498 | time_left = wait_for_completion_timeout(&dev->cmd_complete, |
499 | dev->adapter.timeout); | |
500 | if (!time_left) { | |
95a7f10e | 501 | dev_err(dev->dev, "controller timed out\n"); |
2e65676f | 502 | i2c_recover_bus(adap); |
5a0d5f5f | 503 | dev->buf_len = 0; |
95a7f10e VB |
504 | return -ETIMEDOUT; |
505 | } | |
5a0d5f5f TK |
506 | if (dev->buf_len) { |
507 | /* This should be 0 if all bytes were transferred | |
508 | * or dev->cmd_err denotes an error. | |
5a0d5f5f | 509 | */ |
631de7a4 | 510 | dev_err(dev->dev, "abnormal termination buf_len=%zu\n", |
d9e1f441 | 511 | dev->buf_len); |
5a0d5f5f TK |
512 | dev->terminate = 1; |
513 | wmb(); | |
514 | dev->buf_len = 0; | |
d9e1f441 | 515 | return -EREMOTEIO; |
5a0d5f5f | 516 | } |
95a7f10e VB |
517 | |
518 | /* no error */ | |
519 | if (likely(!dev->cmd_err)) | |
520 | return msg->len; | |
521 | ||
522 | /* We have an error */ | |
523 | if (dev->cmd_err & DAVINCI_I2C_STR_AL) { | |
524 | i2c_davinci_init(dev); | |
525 | return -EIO; | |
526 | } | |
527 | ||
528 | if (dev->cmd_err & DAVINCI_I2C_STR_NACK) { | |
529 | if (msg->flags & I2C_M_IGNORE_NAK) | |
530 | return msg->len; | |
9ea359f7 GS |
531 | w = davinci_i2c_read_reg(dev, DAVINCI_I2C_MDR_REG); |
532 | w |= DAVINCI_I2C_MDR_STP; | |
533 | davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, w); | |
95a7f10e VB |
534 | return -EREMOTEIO; |
535 | } | |
536 | return -EIO; | |
537 | } | |
538 | ||
539 | /* | |
540 | * Prepare controller for a transaction and call i2c_davinci_xfer_msg | |
541 | */ | |
542 | static int | |
543 | i2c_davinci_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) | |
544 | { | |
545 | struct davinci_i2c_dev *dev = i2c_get_adapdata(adap); | |
546 | int i; | |
547 | int ret; | |
548 | ||
08882d20 | 549 | dev_dbg(dev->dev, "%s: msgs: %d\n", __func__, num); |
95a7f10e | 550 | |
17f88151 FCJ |
551 | ret = pm_runtime_get_sync(dev->dev); |
552 | if (ret < 0) { | |
553 | dev_err(dev->dev, "Failed to runtime_get device: %d\n", ret); | |
554 | pm_runtime_put_noidle(dev->dev); | |
555 | return ret; | |
556 | } | |
557 | ||
72a956c5 | 558 | ret = i2c_davinci_wait_bus_not_busy(dev); |
95a7f10e VB |
559 | if (ret < 0) { |
560 | dev_warn(dev->dev, "timeout waiting for bus ready\n"); | |
17f88151 | 561 | goto out; |
95a7f10e VB |
562 | } |
563 | ||
564 | for (i = 0; i < num; i++) { | |
565 | ret = i2c_davinci_xfer_msg(adap, &msgs[i], (i == (num - 1))); | |
d868caa1 TK |
566 | dev_dbg(dev->dev, "%s [%d/%d] ret: %d\n", __func__, i + 1, num, |
567 | ret); | |
95a7f10e | 568 | if (ret < 0) |
17f88151 | 569 | goto out; |
95a7f10e | 570 | } |
82c0de11 | 571 | |
17f88151 | 572 | ret = num; |
82c0de11 | 573 | |
17f88151 FCJ |
574 | out: |
575 | pm_runtime_mark_last_busy(dev->dev); | |
576 | pm_runtime_put_autosuspend(dev->dev); | |
577 | ||
578 | return ret; | |
95a7f10e VB |
579 | } |
580 | ||
581 | static u32 i2c_davinci_func(struct i2c_adapter *adap) | |
582 | { | |
c6c7c729 | 583 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; |
95a7f10e VB |
584 | } |
585 | ||
5a0d5f5f TK |
586 | static void terminate_read(struct davinci_i2c_dev *dev) |
587 | { | |
588 | u16 w = davinci_i2c_read_reg(dev, DAVINCI_I2C_MDR_REG); | |
589 | w |= DAVINCI_I2C_MDR_NACK; | |
590 | davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, w); | |
591 | ||
592 | /* Throw away data */ | |
593 | davinci_i2c_read_reg(dev, DAVINCI_I2C_DRR_REG); | |
594 | if (!dev->terminate) | |
595 | dev_err(dev->dev, "RDR IRQ while no data requested\n"); | |
596 | } | |
597 | static void terminate_write(struct davinci_i2c_dev *dev) | |
598 | { | |
599 | u16 w = davinci_i2c_read_reg(dev, DAVINCI_I2C_MDR_REG); | |
600 | w |= DAVINCI_I2C_MDR_RM | DAVINCI_I2C_MDR_STP; | |
601 | davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, w); | |
602 | ||
603 | if (!dev->terminate) | |
7605fa3b | 604 | dev_dbg(dev->dev, "TDR IRQ while no data to send\n"); |
5a0d5f5f TK |
605 | } |
606 | ||
95a7f10e VB |
607 | /* |
608 | * Interrupt service routine. This gets called whenever an I2C interrupt | |
609 | * occurs. | |
610 | */ | |
611 | static irqreturn_t i2c_davinci_isr(int this_irq, void *dev_id) | |
612 | { | |
613 | struct davinci_i2c_dev *dev = dev_id; | |
614 | u32 stat; | |
615 | int count = 0; | |
616 | u16 w; | |
617 | ||
17f88151 FCJ |
618 | if (pm_runtime_suspended(dev->dev)) |
619 | return IRQ_NONE; | |
620 | ||
95a7f10e | 621 | while ((stat = davinci_i2c_read_reg(dev, DAVINCI_I2C_IVR_REG))) { |
08882d20 | 622 | dev_dbg(dev->dev, "%s: stat=0x%x\n", __func__, stat); |
95a7f10e VB |
623 | if (count++ == 100) { |
624 | dev_warn(dev->dev, "Too much work in one IRQ\n"); | |
625 | break; | |
626 | } | |
627 | ||
628 | switch (stat) { | |
629 | case DAVINCI_I2C_IVR_AL: | |
5a0d5f5f | 630 | /* Arbitration lost, must retry */ |
95a7f10e | 631 | dev->cmd_err |= DAVINCI_I2C_STR_AL; |
5a0d5f5f | 632 | dev->buf_len = 0; |
95a7f10e VB |
633 | complete(&dev->cmd_complete); |
634 | break; | |
635 | ||
636 | case DAVINCI_I2C_IVR_NACK: | |
637 | dev->cmd_err |= DAVINCI_I2C_STR_NACK; | |
5a0d5f5f | 638 | dev->buf_len = 0; |
95a7f10e VB |
639 | complete(&dev->cmd_complete); |
640 | break; | |
641 | ||
642 | case DAVINCI_I2C_IVR_ARDY: | |
b73a9aec TK |
643 | davinci_i2c_write_reg(dev, |
644 | DAVINCI_I2C_STR_REG, DAVINCI_I2C_STR_ARDY); | |
c6c7c729 DB |
645 | if (((dev->buf_len == 0) && (dev->stop != 0)) || |
646 | (dev->cmd_err & DAVINCI_I2C_STR_NACK)) { | |
647 | w = davinci_i2c_read_reg(dev, | |
648 | DAVINCI_I2C_MDR_REG); | |
649 | w |= DAVINCI_I2C_MDR_STP; | |
650 | davinci_i2c_write_reg(dev, | |
651 | DAVINCI_I2C_MDR_REG, w); | |
652 | } | |
95a7f10e VB |
653 | complete(&dev->cmd_complete); |
654 | break; | |
655 | ||
656 | case DAVINCI_I2C_IVR_RDR: | |
657 | if (dev->buf_len) { | |
658 | *dev->buf++ = | |
659 | davinci_i2c_read_reg(dev, | |
660 | DAVINCI_I2C_DRR_REG); | |
661 | dev->buf_len--; | |
662 | if (dev->buf_len) | |
663 | continue; | |
664 | ||
95a7f10e | 665 | davinci_i2c_write_reg(dev, |
b73a9aec TK |
666 | DAVINCI_I2C_STR_REG, |
667 | DAVINCI_I2C_IMR_RRDY); | |
5a0d5f5f TK |
668 | } else { |
669 | /* signal can terminate transfer */ | |
670 | terminate_read(dev); | |
671 | } | |
95a7f10e VB |
672 | break; |
673 | ||
674 | case DAVINCI_I2C_IVR_XRDY: | |
675 | if (dev->buf_len) { | |
676 | davinci_i2c_write_reg(dev, DAVINCI_I2C_DXR_REG, | |
677 | *dev->buf++); | |
678 | dev->buf_len--; | |
679 | if (dev->buf_len) | |
680 | continue; | |
681 | ||
682 | w = davinci_i2c_read_reg(dev, | |
683 | DAVINCI_I2C_IMR_REG); | |
c062a251 | 684 | w &= ~DAVINCI_I2C_IMR_XRDY; |
95a7f10e VB |
685 | davinci_i2c_write_reg(dev, |
686 | DAVINCI_I2C_IMR_REG, | |
687 | w); | |
5a0d5f5f TK |
688 | } else { |
689 | /* signal can terminate transfer */ | |
690 | terminate_write(dev); | |
691 | } | |
95a7f10e VB |
692 | break; |
693 | ||
694 | case DAVINCI_I2C_IVR_SCD: | |
b73a9aec TK |
695 | davinci_i2c_write_reg(dev, |
696 | DAVINCI_I2C_STR_REG, DAVINCI_I2C_STR_SCD); | |
95a7f10e VB |
697 | complete(&dev->cmd_complete); |
698 | break; | |
699 | ||
700 | case DAVINCI_I2C_IVR_AAS: | |
7605fa3b DB |
701 | dev_dbg(dev->dev, "Address as slave interrupt\n"); |
702 | break; | |
703 | ||
704 | default: | |
705 | dev_warn(dev->dev, "Unrecognized irq stat %d\n", stat); | |
706 | break; | |
707 | } | |
708 | } | |
95a7f10e VB |
709 | |
710 | return count ? IRQ_HANDLED : IRQ_NONE; | |
711 | } | |
712 | ||
82c0de11 C |
713 | #ifdef CONFIG_CPU_FREQ |
714 | static int i2c_davinci_cpufreq_transition(struct notifier_block *nb, | |
715 | unsigned long val, void *data) | |
716 | { | |
717 | struct davinci_i2c_dev *dev; | |
718 | ||
719 | dev = container_of(nb, struct davinci_i2c_dev, freq_transition); | |
19cfcafd | 720 | |
3f3a89e1 | 721 | i2c_lock_bus(&dev->adapter, I2C_LOCK_ROOT_ADAPTER); |
82c0de11 | 722 | if (val == CPUFREQ_PRECHANGE) { |
82c0de11 C |
723 | davinci_i2c_reset_ctrl(dev, 0); |
724 | } else if (val == CPUFREQ_POSTCHANGE) { | |
725 | i2c_davinci_calc_clk_dividers(dev); | |
726 | davinci_i2c_reset_ctrl(dev, 1); | |
727 | } | |
3f3a89e1 | 728 | i2c_unlock_bus(&dev->adapter, I2C_LOCK_ROOT_ADAPTER); |
82c0de11 C |
729 | |
730 | return 0; | |
731 | } | |
732 | ||
733 | static inline int i2c_davinci_cpufreq_register(struct davinci_i2c_dev *dev) | |
734 | { | |
735 | dev->freq_transition.notifier_call = i2c_davinci_cpufreq_transition; | |
736 | ||
737 | return cpufreq_register_notifier(&dev->freq_transition, | |
738 | CPUFREQ_TRANSITION_NOTIFIER); | |
739 | } | |
740 | ||
741 | static inline void i2c_davinci_cpufreq_deregister(struct davinci_i2c_dev *dev) | |
742 | { | |
743 | cpufreq_unregister_notifier(&dev->freq_transition, | |
744 | CPUFREQ_TRANSITION_NOTIFIER); | |
745 | } | |
746 | #else | |
747 | static inline int i2c_davinci_cpufreq_register(struct davinci_i2c_dev *dev) | |
748 | { | |
749 | return 0; | |
750 | } | |
751 | ||
752 | static inline void i2c_davinci_cpufreq_deregister(struct davinci_i2c_dev *dev) | |
753 | { | |
754 | } | |
755 | #endif | |
756 | ||
8dc0f8c7 | 757 | static const struct i2c_algorithm i2c_davinci_algo = { |
95a7f10e VB |
758 | .master_xfer = i2c_davinci_xfer, |
759 | .functionality = i2c_davinci_func, | |
760 | }; | |
761 | ||
5c3d8a46 HS |
762 | static const struct of_device_id davinci_i2c_of_match[] = { |
763 | {.compatible = "ti,davinci-i2c", }, | |
35780e86 | 764 | {.compatible = "ti,keystone-i2c", }, |
5c3d8a46 HS |
765 | {}, |
766 | }; | |
767 | MODULE_DEVICE_TABLE(of, davinci_i2c_of_match); | |
768 | ||
95a7f10e VB |
769 | static int davinci_i2c_probe(struct platform_device *pdev) |
770 | { | |
771 | struct davinci_i2c_dev *dev; | |
772 | struct i2c_adapter *adap; | |
2c6ef04f | 773 | struct resource *mem; |
cd2428c3 | 774 | struct i2c_bus_recovery_info *rinfo; |
2c6ef04f GS |
775 | int r, irq; |
776 | ||
777 | irq = platform_get_irq(pdev, 0); | |
778 | if (irq <= 0) { | |
779 | if (!irq) | |
780 | irq = -ENXIO; | |
781 | if (irq != -EPROBE_DEFER) | |
782 | dev_err(&pdev->dev, | |
783 | "can't get irq resource ret=%d\n", irq); | |
784 | return irq; | |
95a7f10e VB |
785 | } |
786 | ||
85796843 VBM |
787 | dev = devm_kzalloc(&pdev->dev, sizeof(struct davinci_i2c_dev), |
788 | GFP_KERNEL); | |
95a7f10e | 789 | if (!dev) { |
85796843 VBM |
790 | dev_err(&pdev->dev, "Memory allocation failed\n"); |
791 | return -ENOMEM; | |
95a7f10e VB |
792 | } |
793 | ||
2e743787 | 794 | init_completion(&dev->cmd_complete); |
19cfcafd | 795 | |
c4df5000 | 796 | dev->dev = &pdev->dev; |
2c6ef04f | 797 | dev->irq = irq; |
1e2c2390 | 798 | dev->pdata = dev_get_platdata(&pdev->dev); |
95a7f10e VB |
799 | platform_set_drvdata(pdev, dev); |
800 | ||
5c3d8a46 HS |
801 | if (!dev->pdata && pdev->dev.of_node) { |
802 | u32 prop; | |
803 | ||
804 | dev->pdata = devm_kzalloc(&pdev->dev, | |
805 | sizeof(struct davinci_i2c_platform_data), GFP_KERNEL); | |
c4df5000 WS |
806 | if (!dev->pdata) |
807 | return -ENOMEM; | |
808 | ||
5c3d8a46 HS |
809 | memcpy(dev->pdata, &davinci_i2c_platform_data_default, |
810 | sizeof(struct davinci_i2c_platform_data)); | |
811 | if (!of_property_read_u32(pdev->dev.of_node, "clock-frequency", | |
812 | &prop)) | |
813 | dev->pdata->bus_freq = prop / 1000; | |
7ef97e9a GS |
814 | |
815 | dev->pdata->has_pfunc = | |
816 | of_property_read_bool(pdev->dev.of_node, | |
817 | "ti,has-pfunc"); | |
5c3d8a46 HS |
818 | } else if (!dev->pdata) { |
819 | dev->pdata = &davinci_i2c_platform_data_default; | |
820 | } | |
821 | ||
85796843 | 822 | dev->clk = devm_clk_get(&pdev->dev, NULL); |
c4df5000 | 823 | if (IS_ERR(dev->clk)) |
cc209ac8 | 824 | return PTR_ERR(dev->clk); |
95a7f10e | 825 | |
3cc2d009 | 826 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
85796843 VBM |
827 | dev->base = devm_ioremap_resource(&pdev->dev, mem); |
828 | if (IS_ERR(dev->base)) { | |
17f88151 FCJ |
829 | return PTR_ERR(dev->base); |
830 | } | |
831 | ||
832 | pm_runtime_set_autosuspend_delay(dev->dev, | |
833 | DAVINCI_I2C_PM_TIMEOUT); | |
834 | pm_runtime_use_autosuspend(dev->dev); | |
835 | ||
836 | pm_runtime_enable(dev->dev); | |
837 | ||
838 | r = pm_runtime_get_sync(dev->dev); | |
839 | if (r < 0) { | |
840 | dev_err(dev->dev, "failed to runtime_get device: %d\n", r); | |
841 | pm_runtime_put_noidle(dev->dev); | |
842 | return r; | |
c062a251 C |
843 | } |
844 | ||
95a7f10e VB |
845 | i2c_davinci_init(dev); |
846 | ||
85796843 VBM |
847 | r = devm_request_irq(&pdev->dev, dev->irq, i2c_davinci_isr, 0, |
848 | pdev->name, dev); | |
95a7f10e VB |
849 | if (r) { |
850 | dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq); | |
851 | goto err_unuse_clocks; | |
852 | } | |
853 | ||
82c0de11 C |
854 | r = i2c_davinci_cpufreq_register(dev); |
855 | if (r) { | |
856 | dev_err(&pdev->dev, "failed to register cpufreq\n"); | |
85796843 | 857 | goto err_unuse_clocks; |
82c0de11 C |
858 | } |
859 | ||
95a7f10e VB |
860 | adap = &dev->adapter; |
861 | i2c_set_adapdata(adap, dev); | |
862 | adap->owner = THIS_MODULE; | |
adcb82a9 | 863 | adap->class = I2C_CLASS_DEPRECATED; |
95a7f10e VB |
864 | strlcpy(adap->name, "DaVinci I2C adapter", sizeof(adap->name)); |
865 | adap->algo = &i2c_davinci_algo; | |
866 | adap->dev.parent = &pdev->dev; | |
98a679ca | 867 | adap->timeout = DAVINCI_I2C_TIMEOUT; |
5c3d8a46 | 868 | adap->dev.of_node = pdev->dev.of_node; |
95a7f10e | 869 | |
7ef97e9a GS |
870 | if (dev->pdata->has_pfunc) |
871 | adap->bus_recovery_info = &davinci_i2c_scl_recovery_info; | |
e5353765 | 872 | else if (dev->pdata->gpio_recovery) { |
cd2428c3 PR |
873 | rinfo = &davinci_i2c_gpio_recovery_info; |
874 | adap->bus_recovery_info = rinfo; | |
e5353765 LW |
875 | rinfo->scl_gpiod = devm_gpiod_get(&pdev->dev, "scl", |
876 | GPIOD_OUT_HIGH_OPEN_DRAIN); | |
877 | if (IS_ERR(rinfo->scl_gpiod)) { | |
878 | r = PTR_ERR(rinfo->scl_gpiod); | |
cd2428c3 | 879 | goto err_unuse_clocks; |
e5353765 LW |
880 | } |
881 | rinfo->sda_gpiod = devm_gpiod_get(&pdev->dev, "sda", GPIOD_IN); | |
882 | if (IS_ERR(rinfo->sda_gpiod)) { | |
883 | r = PTR_ERR(rinfo->sda_gpiod); | |
cd2428c3 | 884 | goto err_unuse_clocks; |
e5353765 | 885 | } |
2e65676f GS |
886 | } |
887 | ||
95a7f10e VB |
888 | adap->nr = pdev->id; |
889 | r = i2c_add_numbered_adapter(adap); | |
ea734404 | 890 | if (r) |
85796843 | 891 | goto err_unuse_clocks; |
95a7f10e | 892 | |
17f88151 FCJ |
893 | pm_runtime_mark_last_busy(dev->dev); |
894 | pm_runtime_put_autosuspend(dev->dev); | |
895 | ||
95a7f10e VB |
896 | return 0; |
897 | ||
95a7f10e | 898 | err_unuse_clocks: |
17f88151 FCJ |
899 | pm_runtime_dont_use_autosuspend(dev->dev); |
900 | pm_runtime_put_sync(dev->dev); | |
901 | pm_runtime_disable(dev->dev); | |
902 | ||
95a7f10e VB |
903 | return r; |
904 | } | |
905 | ||
906 | static int davinci_i2c_remove(struct platform_device *pdev) | |
907 | { | |
908 | struct davinci_i2c_dev *dev = platform_get_drvdata(pdev); | |
17f88151 | 909 | int ret; |
95a7f10e | 910 | |
82c0de11 C |
911 | i2c_davinci_cpufreq_deregister(dev); |
912 | ||
95a7f10e | 913 | i2c_del_adapter(&dev->adapter); |
95a7f10e | 914 | |
17f88151 FCJ |
915 | ret = pm_runtime_get_sync(&pdev->dev); |
916 | if (ret < 0) { | |
917 | pm_runtime_put_noidle(&pdev->dev); | |
918 | return ret; | |
919 | } | |
95a7f10e VB |
920 | |
921 | davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, 0); | |
95a7f10e | 922 | |
17f88151 FCJ |
923 | pm_runtime_dont_use_autosuspend(dev->dev); |
924 | pm_runtime_put_sync(dev->dev); | |
925 | pm_runtime_disable(dev->dev); | |
926 | ||
95a7f10e VB |
927 | return 0; |
928 | } | |
929 | ||
68f15de9 C |
930 | #ifdef CONFIG_PM |
931 | static int davinci_i2c_suspend(struct device *dev) | |
932 | { | |
9242e72a | 933 | struct davinci_i2c_dev *i2c_dev = dev_get_drvdata(dev); |
68f15de9 C |
934 | |
935 | /* put I2C into reset */ | |
936 | davinci_i2c_reset_ctrl(i2c_dev, 0); | |
68f15de9 C |
937 | |
938 | return 0; | |
939 | } | |
940 | ||
941 | static int davinci_i2c_resume(struct device *dev) | |
942 | { | |
9242e72a | 943 | struct davinci_i2c_dev *i2c_dev = dev_get_drvdata(dev); |
68f15de9 | 944 | |
68f15de9 C |
945 | /* take I2C out of reset */ |
946 | davinci_i2c_reset_ctrl(i2c_dev, 1); | |
947 | ||
948 | return 0; | |
949 | } | |
950 | ||
951 | static const struct dev_pm_ops davinci_i2c_pm = { | |
952 | .suspend = davinci_i2c_suspend, | |
953 | .resume = davinci_i2c_resume, | |
17f88151 FCJ |
954 | SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, |
955 | pm_runtime_force_resume) | |
68f15de9 C |
956 | }; |
957 | ||
958 | #define davinci_i2c_pm_ops (&davinci_i2c_pm) | |
959 | #else | |
960 | #define davinci_i2c_pm_ops NULL | |
961 | #endif | |
962 | ||
add8eda7 KS |
963 | /* work with hotplug and coldplug */ |
964 | MODULE_ALIAS("platform:i2c_davinci"); | |
965 | ||
95a7f10e VB |
966 | static struct platform_driver davinci_i2c_driver = { |
967 | .probe = davinci_i2c_probe, | |
968 | .remove = davinci_i2c_remove, | |
969 | .driver = { | |
970 | .name = "i2c_davinci", | |
68f15de9 | 971 | .pm = davinci_i2c_pm_ops, |
4e905323 | 972 | .of_match_table = davinci_i2c_of_match, |
95a7f10e VB |
973 | }, |
974 | }; | |
975 | ||
976 | /* I2C may be needed to bring up other drivers */ | |
977 | static int __init davinci_i2c_init_driver(void) | |
978 | { | |
979 | return platform_driver_register(&davinci_i2c_driver); | |
980 | } | |
981 | subsys_initcall(davinci_i2c_init_driver); | |
982 | ||
983 | static void __exit davinci_i2c_exit_driver(void) | |
984 | { | |
985 | platform_driver_unregister(&davinci_i2c_driver); | |
986 | } | |
987 | module_exit(davinci_i2c_exit_driver); | |
988 | ||
989 | MODULE_AUTHOR("Texas Instruments India"); | |
990 | MODULE_DESCRIPTION("TI DaVinci I2C bus adapter"); | |
991 | MODULE_LICENSE("GPL"); |