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 DEFINE_PCI_DEVICE_TABLE(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 pch_pci_err(pdev, "Memory allocation FAILED\n"); 756 return -ENOMEM; 757 } 758 759 ret = pci_enable_device(pdev); 760 if (ret) { 761 pch_pci_err(pdev, "pci_enable_device FAILED\n"); 762 goto err_pci_enable; 763 } 764 765 ret = pci_request_regions(pdev, KBUILD_MODNAME); 766 if (ret) { 767 pch_pci_err(pdev, "pci_request_regions FAILED\n"); 768 goto err_pci_req; 769 } 770 771 base_addr = pci_iomap(pdev, 1, 0); 772 773 if (base_addr == NULL) { 774 pch_pci_err(pdev, "pci_iomap FAILED\n"); 775 ret = -ENOMEM; 776 goto err_pci_iomap; 777 } 778 779 /* Set the number of I2C channel instance */ 780 adap_info->ch_num = id->driver_data; 781 782 ret = request_irq(pdev->irq, pch_i2c_handler, IRQF_SHARED, 783 KBUILD_MODNAME, adap_info); 784 if (ret) { 785 pch_pci_err(pdev, "request_irq FAILED\n"); 786 goto err_request_irq; 787 } 788 789 for (i = 0; i < adap_info->ch_num; i++) { 790 pch_adap = &adap_info->pch_data[i].pch_adapter; 791 adap_info->pch_i2c_suspended = false; 792 793 adap_info->pch_data[i].p_adapter_info = adap_info; 794 795 pch_adap->owner = THIS_MODULE; 796 pch_adap->class = I2C_CLASS_HWMON; 797 strlcpy(pch_adap->name, KBUILD_MODNAME, sizeof(pch_adap->name)); 798 pch_adap->algo = &pch_algorithm; 799 pch_adap->algo_data = &adap_info->pch_data[i]; 800 801 /* base_addr + offset; */ 802 adap_info->pch_data[i].pch_base_address = base_addr + 0x100 * i; 803 804 pch_adap->dev.parent = &pdev->dev; 805 806 pch_i2c_init(&adap_info->pch_data[i]); 807 808 pch_adap->nr = i; 809 ret = i2c_add_numbered_adapter(pch_adap); 810 if (ret) { 811 pch_pci_err(pdev, "i2c_add_adapter[ch:%d] FAILED\n", i); 812 goto err_add_adapter; 813 } 814 } 815 816 pci_set_drvdata(pdev, adap_info); 817 pch_pci_dbg(pdev, "returns %d.\n", ret); 818 return 0; 819 820 err_add_adapter: 821 for (j = 0; j < i; j++) 822 i2c_del_adapter(&adap_info->pch_data[j].pch_adapter); 823 free_irq(pdev->irq, adap_info); 824 err_request_irq: 825 pci_iounmap(pdev, base_addr); 826 err_pci_iomap: 827 pci_release_regions(pdev); 828 err_pci_req: 829 pci_disable_device(pdev); 830 err_pci_enable: 831 kfree(adap_info); 832 return ret; 833 } 834 835 static void pch_i2c_remove(struct pci_dev *pdev) 836 { 837 int i; 838 struct adapter_info *adap_info = pci_get_drvdata(pdev); 839 840 free_irq(pdev->irq, adap_info); 841 842 for (i = 0; i < adap_info->ch_num; i++) { 843 pch_i2c_disbl_int(&adap_info->pch_data[i]); 844 i2c_del_adapter(&adap_info->pch_data[i].pch_adapter); 845 } 846 847 if (adap_info->pch_data[0].pch_base_address) 848 pci_iounmap(pdev, adap_info->pch_data[0].pch_base_address); 849 850 for (i = 0; i < adap_info->ch_num; i++) 851 adap_info->pch_data[i].pch_base_address = NULL; 852 853 pci_release_regions(pdev); 854 855 pci_disable_device(pdev); 856 kfree(adap_info); 857 } 858 859 #ifdef CONFIG_PM 860 static int pch_i2c_suspend(struct pci_dev *pdev, pm_message_t state) 861 { 862 int ret; 863 int i; 864 struct adapter_info *adap_info = pci_get_drvdata(pdev); 865 void __iomem *p = adap_info->pch_data[0].pch_base_address; 866 867 adap_info->pch_i2c_suspended = true; 868 869 for (i = 0; i < adap_info->ch_num; i++) { 870 while ((adap_info->pch_data[i].pch_i2c_xfer_in_progress)) { 871 /* Wait until all channel transfers are completed */ 872 msleep(20); 873 } 874 } 875 876 /* Disable the i2c interrupts */ 877 for (i = 0; i < adap_info->ch_num; i++) 878 pch_i2c_disbl_int(&adap_info->pch_data[i]); 879 880 pch_pci_dbg(pdev, "I2CSR = %x I2CBUFSTA = %x I2CESRSTA = %x " 881 "invoked function pch_i2c_disbl_int successfully\n", 882 ioread32(p + PCH_I2CSR), ioread32(p + PCH_I2CBUFSTA), 883 ioread32(p + PCH_I2CESRSTA)); 884 885 ret = pci_save_state(pdev); 886 887 if (ret) { 888 pch_pci_err(pdev, "pci_save_state\n"); 889 return ret; 890 } 891 892 pci_enable_wake(pdev, PCI_D3hot, 0); 893 pci_disable_device(pdev); 894 pci_set_power_state(pdev, pci_choose_state(pdev, state)); 895 896 return 0; 897 } 898 899 static int pch_i2c_resume(struct pci_dev *pdev) 900 { 901 int i; 902 struct adapter_info *adap_info = pci_get_drvdata(pdev); 903 904 pci_set_power_state(pdev, PCI_D0); 905 pci_restore_state(pdev); 906 907 if (pci_enable_device(pdev) < 0) { 908 pch_pci_err(pdev, "pch_i2c_resume:pci_enable_device FAILED\n"); 909 return -EIO; 910 } 911 912 pci_enable_wake(pdev, PCI_D3hot, 0); 913 914 for (i = 0; i < adap_info->ch_num; i++) 915 pch_i2c_init(&adap_info->pch_data[i]); 916 917 adap_info->pch_i2c_suspended = false; 918 919 return 0; 920 } 921 #else 922 #define pch_i2c_suspend NULL 923 #define pch_i2c_resume NULL 924 #endif 925 926 static struct pci_driver pch_pcidriver = { 927 .name = KBUILD_MODNAME, 928 .id_table = pch_pcidev_id, 929 .probe = pch_i2c_probe, 930 .remove = pch_i2c_remove, 931 .suspend = pch_i2c_suspend, 932 .resume = pch_i2c_resume 933 }; 934 935 module_pci_driver(pch_pcidriver); 936 937 MODULE_DESCRIPTION("Intel EG20T PCH/LAPIS Semico ML7213/ML7223/ML7831 IOH I2C"); 938 MODULE_LICENSE("GPL"); 939 MODULE_AUTHOR("Tomoya MORINAGA. <tomoya.rohm@gmail.com>"); 940 module_param(pch_i2c_speed, int, (S_IRUSR | S_IWUSR)); 941 module_param(pch_clk, int, (S_IRUSR | S_IWUSR)); 942