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