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rtlwifi: Change order in device startup
[deliverable/linux.git] / drivers / i2c / busses / i2c-eg20t.c
1 /*
2 * Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
16 */
17
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/delay.h>
21 #include <linux/errno.h>
22 #include <linux/i2c.h>
23 #include <linux/fs.h>
24 #include <linux/io.h>
25 #include <linux/types.h>
26 #include <linux/interrupt.h>
27 #include <linux/jiffies.h>
28 #include <linux/pci.h>
29 #include <linux/mutex.h>
30 #include <linux/ktime.h>
31 #include <linux/slab.h>
32
33 #define PCH_EVENT_SET 0 /* I2C Interrupt Event Set Status */
34 #define PCH_EVENT_NONE 1 /* I2C Interrupt Event Clear Status */
35 #define PCH_MAX_CLK 100000 /* Maximum Clock speed in MHz */
36 #define PCH_BUFFER_MODE_ENABLE 0x0002 /* flag for Buffer mode enable */
37 #define PCH_EEPROM_SW_RST_MODE_ENABLE 0x0008 /* EEPROM SW RST enable flag */
38
39 #define PCH_I2CSADR 0x00 /* I2C slave address register */
40 #define PCH_I2CCTL 0x04 /* I2C control register */
41 #define PCH_I2CSR 0x08 /* I2C status register */
42 #define PCH_I2CDR 0x0C /* I2C data register */
43 #define PCH_I2CMON 0x10 /* I2C bus monitor register */
44 #define PCH_I2CBC 0x14 /* I2C bus transfer rate setup counter */
45 #define PCH_I2CMOD 0x18 /* I2C mode register */
46 #define PCH_I2CBUFSLV 0x1C /* I2C buffer mode slave address register */
47 #define PCH_I2CBUFSUB 0x20 /* I2C buffer mode subaddress register */
48 #define PCH_I2CBUFFOR 0x24 /* I2C buffer mode format register */
49 #define PCH_I2CBUFCTL 0x28 /* I2C buffer mode control register */
50 #define PCH_I2CBUFMSK 0x2C /* I2C buffer mode interrupt mask register */
51 #define PCH_I2CBUFSTA 0x30 /* I2C buffer mode status register */
52 #define PCH_I2CBUFLEV 0x34 /* I2C buffer mode level register */
53 #define PCH_I2CESRFOR 0x38 /* EEPROM software reset mode format register */
54 #define PCH_I2CESRCTL 0x3C /* EEPROM software reset mode ctrl register */
55 #define PCH_I2CESRMSK 0x40 /* EEPROM software reset mode */
56 #define PCH_I2CESRSTA 0x44 /* EEPROM software reset mode status register */
57 #define PCH_I2CTMR 0x48 /* I2C timer register */
58 #define PCH_I2CSRST 0xFC /* I2C reset register */
59 #define PCH_I2CNF 0xF8 /* I2C noise filter register */
60
61 #define BUS_IDLE_TIMEOUT 20
62 #define PCH_I2CCTL_I2CMEN 0x0080
63 #define TEN_BIT_ADDR_DEFAULT 0xF000
64 #define TEN_BIT_ADDR_MASK 0xF0
65 #define PCH_START 0x0020
66 #define PCH_RESTART 0x0004
67 #define PCH_ESR_START 0x0001
68 #define PCH_BUFF_START 0x1
69 #define PCH_REPSTART 0x0004
70 #define PCH_ACK 0x0008
71 #define PCH_GETACK 0x0001
72 #define CLR_REG 0x0
73 #define I2C_RD 0x1
74 #define I2CMCF_BIT 0x0080
75 #define I2CMIF_BIT 0x0002
76 #define I2CMAL_BIT 0x0010
77 #define I2CBMFI_BIT 0x0001
78 #define I2CBMAL_BIT 0x0002
79 #define I2CBMNA_BIT 0x0004
80 #define I2CBMTO_BIT 0x0008
81 #define I2CBMIS_BIT 0x0010
82 #define I2CESRFI_BIT 0X0001
83 #define I2CESRTO_BIT 0x0002
84 #define I2CESRFIIE_BIT 0x1
85 #define I2CESRTOIE_BIT 0x2
86 #define I2CBMDZ_BIT 0x0040
87 #define I2CBMAG_BIT 0x0020
88 #define I2CMBB_BIT 0x0020
89 #define BUFFER_MODE_MASK (I2CBMFI_BIT | I2CBMAL_BIT | I2CBMNA_BIT | \
90 I2CBMTO_BIT | I2CBMIS_BIT)
91 #define I2C_ADDR_MSK 0xFF
92 #define I2C_MSB_2B_MSK 0x300
93 #define FAST_MODE_CLK 400
94 #define FAST_MODE_EN 0x0001
95 #define SUB_ADDR_LEN_MAX 4
96 #define BUF_LEN_MAX 32
97 #define PCH_BUFFER_MODE 0x1
98 #define EEPROM_SW_RST_MODE 0x0002
99 #define NORMAL_INTR_ENBL 0x0300
100 #define EEPROM_RST_INTR_ENBL (I2CESRFIIE_BIT | I2CESRTOIE_BIT)
101 #define EEPROM_RST_INTR_DISBL 0x0
102 #define BUFFER_MODE_INTR_ENBL 0x001F
103 #define BUFFER_MODE_INTR_DISBL 0x0
104 #define NORMAL_MODE 0x0
105 #define BUFFER_MODE 0x1
106 #define EEPROM_SR_MODE 0x2
107 #define I2C_TX_MODE 0x0010
108 #define PCH_BUF_TX 0xFFF7
109 #define PCH_BUF_RD 0x0008
110 #define I2C_ERROR_MASK (I2CESRTO_EVENT | I2CBMIS_EVENT | I2CBMTO_EVENT | \
111 I2CBMNA_EVENT | I2CBMAL_EVENT | I2CMAL_EVENT)
112 #define I2CMAL_EVENT 0x0001
113 #define I2CMCF_EVENT 0x0002
114 #define I2CBMFI_EVENT 0x0004
115 #define I2CBMAL_EVENT 0x0008
116 #define I2CBMNA_EVENT 0x0010
117 #define I2CBMTO_EVENT 0x0020
118 #define I2CBMIS_EVENT 0x0040
119 #define I2CESRFI_EVENT 0x0080
120 #define I2CESRTO_EVENT 0x0100
121 #define PCI_DEVICE_ID_PCH_I2C 0x8817
122
123 #define pch_dbg(adap, fmt, arg...) \
124 dev_dbg(adap->pch_adapter.dev.parent, "%s :" fmt, __func__, ##arg)
125
126 #define pch_err(adap, fmt, arg...) \
127 dev_err(adap->pch_adapter.dev.parent, "%s :" fmt, __func__, ##arg)
128
129 #define pch_pci_err(pdev, fmt, arg...) \
130 dev_err(&pdev->dev, "%s :" fmt, __func__, ##arg)
131
132 #define pch_pci_dbg(pdev, fmt, arg...) \
133 dev_dbg(&pdev->dev, "%s :" fmt, __func__, ##arg)
134
135 /*
136 Set the number of I2C instance max
137 Intel EG20T PCH : 1ch
138 LAPIS Semiconductor ML7213 IOH : 2ch
139 LAPIS Semiconductor ML7831 IOH : 1ch
140 */
141 #define PCH_I2C_MAX_DEV 2
142
143 /**
144 * struct i2c_algo_pch_data - for I2C driver functionalities
145 * @pch_adapter: stores the reference to i2c_adapter structure
146 * @p_adapter_info: stores the reference to adapter_info structure
147 * @pch_base_address: specifies the remapped base address
148 * @pch_buff_mode_en: specifies if buffer mode is enabled
149 * @pch_event_flag: specifies occurrence of interrupt events
150 * @pch_i2c_xfer_in_progress: specifies whether the transfer is completed
151 */
152 struct i2c_algo_pch_data {
153 struct i2c_adapter pch_adapter;
154 struct adapter_info *p_adapter_info;
155 void __iomem *pch_base_address;
156 int pch_buff_mode_en;
157 u32 pch_event_flag;
158 bool pch_i2c_xfer_in_progress;
159 };
160
161 /**
162 * struct adapter_info - This structure holds the adapter information for the
163 PCH i2c controller
164 * @pch_data: stores a list of i2c_algo_pch_data
165 * @pch_i2c_suspended: specifies whether the system is suspended or not
166 * perhaps with more lines and words.
167 * @ch_num: specifies the number of i2c instance
168 *
169 * pch_data has as many elements as maximum I2C channels
170 */
171 struct adapter_info {
172 struct i2c_algo_pch_data pch_data[PCH_I2C_MAX_DEV];
173 bool pch_i2c_suspended;
174 int ch_num;
175 };
176
177
178 static int pch_i2c_speed = 100; /* I2C bus speed in Kbps */
179 static int pch_clk = 50000; /* specifies I2C clock speed in KHz */
180 static wait_queue_head_t pch_event;
181 static DEFINE_MUTEX(pch_mutex);
182
183 /* Definition for ML7213 by LAPIS Semiconductor */
184 #define PCI_VENDOR_ID_ROHM 0x10DB
185 #define PCI_DEVICE_ID_ML7213_I2C 0x802D
186 #define PCI_DEVICE_ID_ML7223_I2C 0x8010
187 #define PCI_DEVICE_ID_ML7831_I2C 0x8817
188
189 static const struct pci_device_id pch_pcidev_id[] = {
190 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_PCH_I2C), 1, },
191 { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_I2C), 2, },
192 { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_I2C), 1, },
193 { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7831_I2C), 1, },
194 {0,}
195 };
196
197 static irqreturn_t pch_i2c_handler(int irq, void *pData);
198
199 static inline void pch_setbit(void __iomem *addr, u32 offset, u32 bitmask)
200 {
201 u32 val;
202 val = ioread32(addr + offset);
203 val |= bitmask;
204 iowrite32(val, addr + offset);
205 }
206
207 static inline void pch_clrbit(void __iomem *addr, u32 offset, u32 bitmask)
208 {
209 u32 val;
210 val = ioread32(addr + offset);
211 val &= (~bitmask);
212 iowrite32(val, addr + offset);
213 }
214
215 /**
216 * pch_i2c_init() - hardware initialization of I2C module
217 * @adap: Pointer to struct i2c_algo_pch_data.
218 */
219 static void pch_i2c_init(struct i2c_algo_pch_data *adap)
220 {
221 void __iomem *p = adap->pch_base_address;
222 u32 pch_i2cbc;
223 u32 pch_i2ctmr;
224 u32 reg_value;
225
226 /* reset I2C controller */
227 iowrite32(0x01, p + PCH_I2CSRST);
228 msleep(20);
229 iowrite32(0x0, p + PCH_I2CSRST);
230
231 /* Initialize I2C registers */
232 iowrite32(0x21, p + PCH_I2CNF);
233
234 pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_I2CCTL_I2CMEN);
235
236 if (pch_i2c_speed != 400)
237 pch_i2c_speed = 100;
238
239 reg_value = PCH_I2CCTL_I2CMEN;
240 if (pch_i2c_speed == FAST_MODE_CLK) {
241 reg_value |= FAST_MODE_EN;
242 pch_dbg(adap, "Fast mode enabled\n");
243 }
244
245 if (pch_clk > PCH_MAX_CLK)
246 pch_clk = 62500;
247
248 pch_i2cbc = (pch_clk + (pch_i2c_speed * 4)) / (pch_i2c_speed * 8);
249 /* Set transfer speed in I2CBC */
250 iowrite32(pch_i2cbc, p + PCH_I2CBC);
251
252 pch_i2ctmr = (pch_clk) / 8;
253 iowrite32(pch_i2ctmr, p + PCH_I2CTMR);
254
255 reg_value |= NORMAL_INTR_ENBL; /* Enable interrupts in normal mode */
256 iowrite32(reg_value, p + PCH_I2CCTL);
257
258 pch_dbg(adap,
259 "I2CCTL=%x pch_i2cbc=%x pch_i2ctmr=%x Enable interrupts\n",
260 ioread32(p + PCH_I2CCTL), pch_i2cbc, pch_i2ctmr);
261
262 init_waitqueue_head(&pch_event);
263 }
264
265 /**
266 * pch_i2c_wait_for_bus_idle() - check the status of bus.
267 * @adap: Pointer to struct i2c_algo_pch_data.
268 * @timeout: waiting time counter (ms).
269 */
270 static s32 pch_i2c_wait_for_bus_idle(struct i2c_algo_pch_data *adap,
271 s32 timeout)
272 {
273 void __iomem *p = adap->pch_base_address;
274 int schedule = 0;
275 unsigned long end = jiffies + msecs_to_jiffies(timeout);
276
277 while (ioread32(p + PCH_I2CSR) & I2CMBB_BIT) {
278 if (time_after(jiffies, end)) {
279 pch_dbg(adap, "I2CSR = %x\n", ioread32(p + PCH_I2CSR));
280 pch_err(adap, "%s: Timeout Error.return%d\n",
281 __func__, -ETIME);
282 pch_i2c_init(adap);
283
284 return -ETIME;
285 }
286
287 if (!schedule)
288 /* Retry after some usecs */
289 udelay(5);
290 else
291 /* Wait a bit more without consuming CPU */
292 usleep_range(20, 1000);
293
294 schedule = 1;
295 }
296
297 return 0;
298 }
299
300 /**
301 * pch_i2c_start() - Generate I2C start condition in normal mode.
302 * @adap: Pointer to struct i2c_algo_pch_data.
303 *
304 * Generate I2C start condition in normal mode by setting I2CCTL.I2CMSTA to 1.
305 */
306 static void pch_i2c_start(struct i2c_algo_pch_data *adap)
307 {
308 void __iomem *p = adap->pch_base_address;
309 pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL));
310 pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_START);
311 }
312
313 /**
314 * pch_i2c_stop() - generate stop condition in normal mode.
315 * @adap: Pointer to struct i2c_algo_pch_data.
316 */
317 static void pch_i2c_stop(struct i2c_algo_pch_data *adap)
318 {
319 void __iomem *p = adap->pch_base_address;
320 pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL));
321 /* clear the start bit */
322 pch_clrbit(adap->pch_base_address, PCH_I2CCTL, PCH_START);
323 }
324
325 static int pch_i2c_wait_for_check_xfer(struct i2c_algo_pch_data *adap)
326 {
327 long ret;
328 void __iomem *p = adap->pch_base_address;
329
330 ret = wait_event_timeout(pch_event,
331 (adap->pch_event_flag != 0), msecs_to_jiffies(1000));
332 if (!ret) {
333 pch_err(adap, "%s:wait-event timeout\n", __func__);
334 adap->pch_event_flag = 0;
335 pch_i2c_stop(adap);
336 pch_i2c_init(adap);
337 return -ETIMEDOUT;
338 }
339
340 if (adap->pch_event_flag & I2C_ERROR_MASK) {
341 pch_err(adap, "Lost Arbitration\n");
342 adap->pch_event_flag = 0;
343 pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMAL_BIT);
344 pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMIF_BIT);
345 pch_i2c_init(adap);
346 return -EAGAIN;
347 }
348
349 adap->pch_event_flag = 0;
350
351 if (ioread32(p + PCH_I2CSR) & PCH_GETACK) {
352 pch_dbg(adap, "Receive NACK for slave address setting\n");
353 return -ENXIO;
354 }
355
356 return 0;
357 }
358
359 /**
360 * pch_i2c_repstart() - generate repeated start condition in normal mode
361 * @adap: Pointer to struct i2c_algo_pch_data.
362 */
363 static void pch_i2c_repstart(struct i2c_algo_pch_data *adap)
364 {
365 void __iomem *p = adap->pch_base_address;
366 pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL));
367 pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_REPSTART);
368 }
369
370 /**
371 * pch_i2c_writebytes() - write data to I2C bus in normal mode
372 * @i2c_adap: Pointer to the struct i2c_adapter.
373 * @last: specifies whether last message or not.
374 * In the case of compound mode it will be 1 for last message,
375 * otherwise 0.
376 * @first: specifies whether first message or not.
377 * 1 for first message otherwise 0.
378 */
379 static s32 pch_i2c_writebytes(struct i2c_adapter *i2c_adap,
380 struct i2c_msg *msgs, u32 last, u32 first)
381 {
382 struct i2c_algo_pch_data *adap = i2c_adap->algo_data;
383 u8 *buf;
384 u32 length;
385 u32 addr;
386 u32 addr_2_msb;
387 u32 addr_8_lsb;
388 s32 wrcount;
389 s32 rtn;
390 void __iomem *p = adap->pch_base_address;
391
392 length = msgs->len;
393 buf = msgs->buf;
394 addr = msgs->addr;
395
396 /* enable master tx */
397 pch_setbit(adap->pch_base_address, PCH_I2CCTL, I2C_TX_MODE);
398
399 pch_dbg(adap, "I2CCTL = %x msgs->len = %d\n", ioread32(p + PCH_I2CCTL),
400 length);
401
402 if (first) {
403 if (pch_i2c_wait_for_bus_idle(adap, BUS_IDLE_TIMEOUT) == -ETIME)
404 return -ETIME;
405 }
406
407 if (msgs->flags & I2C_M_TEN) {
408 addr_2_msb = ((addr & I2C_MSB_2B_MSK) >> 7) & 0x06;
409 iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK, p + PCH_I2CDR);
410 if (first)
411 pch_i2c_start(adap);
412
413 rtn = pch_i2c_wait_for_check_xfer(adap);
414 if (rtn)
415 return rtn;
416
417 addr_8_lsb = (addr & I2C_ADDR_MSK);
418 iowrite32(addr_8_lsb, p + PCH_I2CDR);
419 } else {
420 /* set 7 bit slave address and R/W bit as 0 */
421 iowrite32(addr << 1, p + PCH_I2CDR);
422 if (first)
423 pch_i2c_start(adap);
424 }
425
426 rtn = pch_i2c_wait_for_check_xfer(adap);
427 if (rtn)
428 return rtn;
429
430 for (wrcount = 0; wrcount < length; ++wrcount) {
431 /* write buffer value to I2C data register */
432 iowrite32(buf[wrcount], p + PCH_I2CDR);
433 pch_dbg(adap, "writing %x to Data register\n", buf[wrcount]);
434
435 rtn = pch_i2c_wait_for_check_xfer(adap);
436 if (rtn)
437 return rtn;
438
439 pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMCF_BIT);
440 pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMIF_BIT);
441 }
442
443 /* check if this is the last message */
444 if (last)
445 pch_i2c_stop(adap);
446 else
447 pch_i2c_repstart(adap);
448
449 pch_dbg(adap, "return=%d\n", wrcount);
450
451 return wrcount;
452 }
453
454 /**
455 * pch_i2c_sendack() - send ACK
456 * @adap: Pointer to struct i2c_algo_pch_data.
457 */
458 static void pch_i2c_sendack(struct i2c_algo_pch_data *adap)
459 {
460 void __iomem *p = adap->pch_base_address;
461 pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL));
462 pch_clrbit(adap->pch_base_address, PCH_I2CCTL, PCH_ACK);
463 }
464
465 /**
466 * pch_i2c_sendnack() - send NACK
467 * @adap: Pointer to struct i2c_algo_pch_data.
468 */
469 static void pch_i2c_sendnack(struct i2c_algo_pch_data *adap)
470 {
471 void __iomem *p = adap->pch_base_address;
472 pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL));
473 pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_ACK);
474 }
475
476 /**
477 * pch_i2c_restart() - Generate I2C restart condition in normal mode.
478 * @adap: Pointer to struct i2c_algo_pch_data.
479 *
480 * Generate I2C restart condition in normal mode by setting I2CCTL.I2CRSTA.
481 */
482 static void pch_i2c_restart(struct i2c_algo_pch_data *adap)
483 {
484 void __iomem *p = adap->pch_base_address;
485 pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL));
486 pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_RESTART);
487 }
488
489 /**
490 * pch_i2c_readbytes() - read data from I2C bus in normal mode.
491 * @i2c_adap: Pointer to the struct i2c_adapter.
492 * @msgs: Pointer to i2c_msg structure.
493 * @last: specifies whether last message or not.
494 * @first: specifies whether first message or not.
495 */
496 static s32 pch_i2c_readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs,
497 u32 last, u32 first)
498 {
499 struct i2c_algo_pch_data *adap = i2c_adap->algo_data;
500
501 u8 *buf;
502 u32 count;
503 u32 length;
504 u32 addr;
505 u32 addr_2_msb;
506 u32 addr_8_lsb;
507 void __iomem *p = adap->pch_base_address;
508 s32 rtn;
509
510 length = msgs->len;
511 buf = msgs->buf;
512 addr = msgs->addr;
513
514 /* enable master reception */
515 pch_clrbit(adap->pch_base_address, PCH_I2CCTL, I2C_TX_MODE);
516
517 if (first) {
518 if (pch_i2c_wait_for_bus_idle(adap, BUS_IDLE_TIMEOUT) == -ETIME)
519 return -ETIME;
520 }
521
522 if (msgs->flags & I2C_M_TEN) {
523 addr_2_msb = ((addr & I2C_MSB_2B_MSK) >> 7);
524 iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK, p + PCH_I2CDR);
525 if (first)
526 pch_i2c_start(adap);
527
528 rtn = pch_i2c_wait_for_check_xfer(adap);
529 if (rtn)
530 return rtn;
531
532 addr_8_lsb = (addr & I2C_ADDR_MSK);
533 iowrite32(addr_8_lsb, p + PCH_I2CDR);
534
535 pch_i2c_restart(adap);
536
537 rtn = pch_i2c_wait_for_check_xfer(adap);
538 if (rtn)
539 return rtn;
540
541 addr_2_msb |= I2C_RD;
542 iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK, p + PCH_I2CDR);
543 } else {
544 /* 7 address bits + R/W bit */
545 addr = (((addr) << 1) | (I2C_RD));
546 iowrite32(addr, p + PCH_I2CDR);
547 }
548
549 /* check if it is the first message */
550 if (first)
551 pch_i2c_start(adap);
552
553 rtn = pch_i2c_wait_for_check_xfer(adap);
554 if (rtn)
555 return rtn;
556
557 if (length == 0) {
558 pch_i2c_stop(adap);
559 ioread32(p + PCH_I2CDR); /* Dummy read needs */
560
561 count = length;
562 } else {
563 int read_index;
564 int loop;
565 pch_i2c_sendack(adap);
566
567 /* Dummy read */
568 for (loop = 1, read_index = 0; loop < length; loop++) {
569 buf[read_index] = ioread32(p + PCH_I2CDR);
570
571 if (loop != 1)
572 read_index++;
573
574 rtn = pch_i2c_wait_for_check_xfer(adap);
575 if (rtn)
576 return rtn;
577 } /* end for */
578
579 pch_i2c_sendnack(adap);
580
581 buf[read_index] = ioread32(p + PCH_I2CDR); /* Read final - 1 */
582
583 if (length != 1)
584 read_index++;
585
586 rtn = pch_i2c_wait_for_check_xfer(adap);
587 if (rtn)
588 return rtn;
589
590 if (last)
591 pch_i2c_stop(adap);
592 else
593 pch_i2c_repstart(adap);
594
595 buf[read_index++] = ioread32(p + PCH_I2CDR); /* Read Final */
596 count = read_index;
597 }
598
599 return count;
600 }
601
602 /**
603 * pch_i2c_cb() - Interrupt handler Call back function
604 * @adap: Pointer to struct i2c_algo_pch_data.
605 */
606 static void pch_i2c_cb(struct i2c_algo_pch_data *adap)
607 {
608 u32 sts;
609 void __iomem *p = adap->pch_base_address;
610
611 sts = ioread32(p + PCH_I2CSR);
612 sts &= (I2CMAL_BIT | I2CMCF_BIT | I2CMIF_BIT);
613 if (sts & I2CMAL_BIT)
614 adap->pch_event_flag |= I2CMAL_EVENT;
615
616 if (sts & I2CMCF_BIT)
617 adap->pch_event_flag |= I2CMCF_EVENT;
618
619 /* clear the applicable bits */
620 pch_clrbit(adap->pch_base_address, PCH_I2CSR, sts);
621
622 pch_dbg(adap, "PCH_I2CSR = %x\n", ioread32(p + PCH_I2CSR));
623
624 wake_up(&pch_event);
625 }
626
627 /**
628 * pch_i2c_handler() - interrupt handler for the PCH I2C controller
629 * @irq: irq number.
630 * @pData: cookie passed back to the handler function.
631 */
632 static irqreturn_t pch_i2c_handler(int irq, void *pData)
633 {
634 u32 reg_val;
635 int flag;
636 int i;
637 struct adapter_info *adap_info = pData;
638 void __iomem *p;
639 u32 mode;
640
641 for (i = 0, flag = 0; i < adap_info->ch_num; i++) {
642 p = adap_info->pch_data[i].pch_base_address;
643 mode = ioread32(p + PCH_I2CMOD);
644 mode &= BUFFER_MODE | EEPROM_SR_MODE;
645 if (mode != NORMAL_MODE) {
646 pch_err(adap_info->pch_data,
647 "I2C-%d mode(%d) is not supported\n", mode, i);
648 continue;
649 }
650 reg_val = ioread32(p + PCH_I2CSR);
651 if (reg_val & (I2CMAL_BIT | I2CMCF_BIT | I2CMIF_BIT)) {
652 pch_i2c_cb(&adap_info->pch_data[i]);
653 flag = 1;
654 }
655 }
656
657 return flag ? IRQ_HANDLED : IRQ_NONE;
658 }
659
660 /**
661 * pch_i2c_xfer() - Reading adnd writing data through I2C bus
662 * @i2c_adap: Pointer to the struct i2c_adapter.
663 * @msgs: Pointer to i2c_msg structure.
664 * @num: number of messages.
665 */
666 static s32 pch_i2c_xfer(struct i2c_adapter *i2c_adap,
667 struct i2c_msg *msgs, s32 num)
668 {
669 struct i2c_msg *pmsg;
670 u32 i = 0;
671 u32 status;
672 s32 ret;
673
674 struct i2c_algo_pch_data *adap = i2c_adap->algo_data;
675
676 ret = mutex_lock_interruptible(&pch_mutex);
677 if (ret)
678 return ret;
679
680 if (adap->p_adapter_info->pch_i2c_suspended) {
681 mutex_unlock(&pch_mutex);
682 return -EBUSY;
683 }
684
685 pch_dbg(adap, "adap->p_adapter_info->pch_i2c_suspended is %d\n",
686 adap->p_adapter_info->pch_i2c_suspended);
687 /* transfer not completed */
688 adap->pch_i2c_xfer_in_progress = true;
689
690 for (i = 0; i < num && ret >= 0; i++) {
691 pmsg = &msgs[i];
692 pmsg->flags |= adap->pch_buff_mode_en;
693 status = pmsg->flags;
694 pch_dbg(adap,
695 "After invoking I2C_MODE_SEL :flag= 0x%x\n", status);
696
697 if ((status & (I2C_M_RD)) != false) {
698 ret = pch_i2c_readbytes(i2c_adap, pmsg, (i + 1 == num),
699 (i == 0));
700 } else {
701 ret = pch_i2c_writebytes(i2c_adap, pmsg, (i + 1 == num),
702 (i == 0));
703 }
704 }
705
706 adap->pch_i2c_xfer_in_progress = false; /* transfer completed */
707
708 mutex_unlock(&pch_mutex);
709
710 return (ret < 0) ? ret : num;
711 }
712
713 /**
714 * pch_i2c_func() - return the functionality of the I2C driver
715 * @adap: Pointer to struct i2c_algo_pch_data.
716 */
717 static u32 pch_i2c_func(struct i2c_adapter *adap)
718 {
719 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR;
720 }
721
722 static struct i2c_algorithm pch_algorithm = {
723 .master_xfer = pch_i2c_xfer,
724 .functionality = pch_i2c_func
725 };
726
727 /**
728 * pch_i2c_disbl_int() - Disable PCH I2C interrupts
729 * @adap: Pointer to struct i2c_algo_pch_data.
730 */
731 static void pch_i2c_disbl_int(struct i2c_algo_pch_data *adap)
732 {
733 void __iomem *p = adap->pch_base_address;
734
735 pch_clrbit(adap->pch_base_address, PCH_I2CCTL, NORMAL_INTR_ENBL);
736
737 iowrite32(EEPROM_RST_INTR_DISBL, p + PCH_I2CESRMSK);
738
739 iowrite32(BUFFER_MODE_INTR_DISBL, p + PCH_I2CBUFMSK);
740 }
741
742 static int pch_i2c_probe(struct pci_dev *pdev,
743 const struct pci_device_id *id)
744 {
745 void __iomem *base_addr;
746 int ret;
747 int i, j;
748 struct adapter_info *adap_info;
749 struct i2c_adapter *pch_adap;
750
751 pch_pci_dbg(pdev, "Entered.\n");
752
753 adap_info = kzalloc((sizeof(struct adapter_info)), GFP_KERNEL);
754 if (adap_info == NULL)
755 return -ENOMEM;
756
757 ret = pci_enable_device(pdev);
758 if (ret) {
759 pch_pci_err(pdev, "pci_enable_device FAILED\n");
760 goto err_pci_enable;
761 }
762
763 ret = pci_request_regions(pdev, KBUILD_MODNAME);
764 if (ret) {
765 pch_pci_err(pdev, "pci_request_regions FAILED\n");
766 goto err_pci_req;
767 }
768
769 base_addr = pci_iomap(pdev, 1, 0);
770
771 if (base_addr == NULL) {
772 pch_pci_err(pdev, "pci_iomap FAILED\n");
773 ret = -ENOMEM;
774 goto err_pci_iomap;
775 }
776
777 /* Set the number of I2C channel instance */
778 adap_info->ch_num = id->driver_data;
779
780 ret = request_irq(pdev->irq, pch_i2c_handler, IRQF_SHARED,
781 KBUILD_MODNAME, adap_info);
782 if (ret) {
783 pch_pci_err(pdev, "request_irq FAILED\n");
784 goto err_request_irq;
785 }
786
787 for (i = 0; i < adap_info->ch_num; i++) {
788 pch_adap = &adap_info->pch_data[i].pch_adapter;
789 adap_info->pch_i2c_suspended = false;
790
791 adap_info->pch_data[i].p_adapter_info = adap_info;
792
793 pch_adap->owner = THIS_MODULE;
794 pch_adap->class = I2C_CLASS_HWMON;
795 strlcpy(pch_adap->name, KBUILD_MODNAME, sizeof(pch_adap->name));
796 pch_adap->algo = &pch_algorithm;
797 pch_adap->algo_data = &adap_info->pch_data[i];
798
799 /* base_addr + offset; */
800 adap_info->pch_data[i].pch_base_address = base_addr + 0x100 * i;
801
802 pch_adap->dev.parent = &pdev->dev;
803
804 pch_i2c_init(&adap_info->pch_data[i]);
805
806 pch_adap->nr = i;
807 ret = i2c_add_numbered_adapter(pch_adap);
808 if (ret) {
809 pch_pci_err(pdev, "i2c_add_adapter[ch:%d] FAILED\n", i);
810 goto err_add_adapter;
811 }
812 }
813
814 pci_set_drvdata(pdev, adap_info);
815 pch_pci_dbg(pdev, "returns %d.\n", ret);
816 return 0;
817
818 err_add_adapter:
819 for (j = 0; j < i; j++)
820 i2c_del_adapter(&adap_info->pch_data[j].pch_adapter);
821 free_irq(pdev->irq, adap_info);
822 err_request_irq:
823 pci_iounmap(pdev, base_addr);
824 err_pci_iomap:
825 pci_release_regions(pdev);
826 err_pci_req:
827 pci_disable_device(pdev);
828 err_pci_enable:
829 kfree(adap_info);
830 return ret;
831 }
832
833 static void pch_i2c_remove(struct pci_dev *pdev)
834 {
835 int i;
836 struct adapter_info *adap_info = pci_get_drvdata(pdev);
837
838 free_irq(pdev->irq, adap_info);
839
840 for (i = 0; i < adap_info->ch_num; i++) {
841 pch_i2c_disbl_int(&adap_info->pch_data[i]);
842 i2c_del_adapter(&adap_info->pch_data[i].pch_adapter);
843 }
844
845 if (adap_info->pch_data[0].pch_base_address)
846 pci_iounmap(pdev, adap_info->pch_data[0].pch_base_address);
847
848 for (i = 0; i < adap_info->ch_num; i++)
849 adap_info->pch_data[i].pch_base_address = NULL;
850
851 pci_release_regions(pdev);
852
853 pci_disable_device(pdev);
854 kfree(adap_info);
855 }
856
857 #ifdef CONFIG_PM
858 static int pch_i2c_suspend(struct pci_dev *pdev, pm_message_t state)
859 {
860 int ret;
861 int i;
862 struct adapter_info *adap_info = pci_get_drvdata(pdev);
863 void __iomem *p = adap_info->pch_data[0].pch_base_address;
864
865 adap_info->pch_i2c_suspended = true;
866
867 for (i = 0; i < adap_info->ch_num; i++) {
868 while ((adap_info->pch_data[i].pch_i2c_xfer_in_progress)) {
869 /* Wait until all channel transfers are completed */
870 msleep(20);
871 }
872 }
873
874 /* Disable the i2c interrupts */
875 for (i = 0; i < adap_info->ch_num; i++)
876 pch_i2c_disbl_int(&adap_info->pch_data[i]);
877
878 pch_pci_dbg(pdev, "I2CSR = %x I2CBUFSTA = %x I2CESRSTA = %x "
879 "invoked function pch_i2c_disbl_int successfully\n",
880 ioread32(p + PCH_I2CSR), ioread32(p + PCH_I2CBUFSTA),
881 ioread32(p + PCH_I2CESRSTA));
882
883 ret = pci_save_state(pdev);
884
885 if (ret) {
886 pch_pci_err(pdev, "pci_save_state\n");
887 return ret;
888 }
889
890 pci_enable_wake(pdev, PCI_D3hot, 0);
891 pci_disable_device(pdev);
892 pci_set_power_state(pdev, pci_choose_state(pdev, state));
893
894 return 0;
895 }
896
897 static int pch_i2c_resume(struct pci_dev *pdev)
898 {
899 int i;
900 struct adapter_info *adap_info = pci_get_drvdata(pdev);
901
902 pci_set_power_state(pdev, PCI_D0);
903 pci_restore_state(pdev);
904
905 if (pci_enable_device(pdev) < 0) {
906 pch_pci_err(pdev, "pch_i2c_resume:pci_enable_device FAILED\n");
907 return -EIO;
908 }
909
910 pci_enable_wake(pdev, PCI_D3hot, 0);
911
912 for (i = 0; i < adap_info->ch_num; i++)
913 pch_i2c_init(&adap_info->pch_data[i]);
914
915 adap_info->pch_i2c_suspended = false;
916
917 return 0;
918 }
919 #else
920 #define pch_i2c_suspend NULL
921 #define pch_i2c_resume NULL
922 #endif
923
924 static struct pci_driver pch_pcidriver = {
925 .name = KBUILD_MODNAME,
926 .id_table = pch_pcidev_id,
927 .probe = pch_i2c_probe,
928 .remove = pch_i2c_remove,
929 .suspend = pch_i2c_suspend,
930 .resume = pch_i2c_resume
931 };
932
933 module_pci_driver(pch_pcidriver);
934
935 MODULE_DESCRIPTION("Intel EG20T PCH/LAPIS Semico ML7213/ML7223/ML7831 IOH I2C");
936 MODULE_LICENSE("GPL");
937 MODULE_AUTHOR("Tomoya MORINAGA. <tomoya.rohm@gmail.com>");
938 module_param(pch_i2c_speed, int, (S_IRUSR | S_IWUSR));
939 module_param(pch_clk, int, (S_IRUSR | S_IWUSR));
Linux kernel - Deliverables
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