1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2011 LAPIS Semiconductor Co., Ltd. 4 */ 5 6 #include <linux/module.h> 7 #include <linux/kernel.h> 8 #include <linux/delay.h> 9 #include <linux/errno.h> 10 #include <linux/i2c.h> 11 #include <linux/fs.h> 12 #include <linux/io.h> 13 #include <linux/types.h> 14 #include <linux/interrupt.h> 15 #include <linux/jiffies.h> 16 #include <linux/pci.h> 17 #include <linux/mutex.h> 18 #include <linux/ktime.h> 19 #include <linux/slab.h> 20 21 #define PCH_EVENT_SET 0 /* I2C Interrupt Event Set Status */ 22 #define PCH_EVENT_NONE 1 /* I2C Interrupt Event Clear Status */ 23 #define PCH_MAX_CLK 100000 /* Maximum Clock speed in MHz */ 24 #define PCH_BUFFER_MODE_ENABLE 0x0002 /* flag for Buffer mode enable */ 25 #define PCH_EEPROM_SW_RST_MODE_ENABLE 0x0008 /* EEPROM SW RST enable flag */ 26 27 #define PCH_I2CSADR 0x00 /* I2C slave address register */ 28 #define PCH_I2CCTL 0x04 /* I2C control register */ 29 #define PCH_I2CSR 0x08 /* I2C status register */ 30 #define PCH_I2CDR 0x0C /* I2C data register */ 31 #define PCH_I2CMON 0x10 /* I2C bus monitor register */ 32 #define PCH_I2CBC 0x14 /* I2C bus transfer rate setup counter */ 33 #define PCH_I2CMOD 0x18 /* I2C mode register */ 34 #define PCH_I2CBUFSLV 0x1C /* I2C buffer mode slave address register */ 35 #define PCH_I2CBUFSUB 0x20 /* I2C buffer mode subaddress register */ 36 #define PCH_I2CBUFFOR 0x24 /* I2C buffer mode format register */ 37 #define PCH_I2CBUFCTL 0x28 /* I2C buffer mode control register */ 38 #define PCH_I2CBUFMSK 0x2C /* I2C buffer mode interrupt mask register */ 39 #define PCH_I2CBUFSTA 0x30 /* I2C buffer mode status register */ 40 #define PCH_I2CBUFLEV 0x34 /* I2C buffer mode level register */ 41 #define PCH_I2CESRFOR 0x38 /* EEPROM software reset mode format register */ 42 #define PCH_I2CESRCTL 0x3C /* EEPROM software reset mode ctrl register */ 43 #define PCH_I2CESRMSK 0x40 /* EEPROM software reset mode */ 44 #define PCH_I2CESRSTA 0x44 /* EEPROM software reset mode status register */ 45 #define PCH_I2CTMR 0x48 /* I2C timer register */ 46 #define PCH_I2CSRST 0xFC /* I2C reset register */ 47 #define PCH_I2CNF 0xF8 /* I2C noise filter register */ 48 49 #define BUS_IDLE_TIMEOUT 20 50 #define PCH_I2CCTL_I2CMEN 0x0080 51 #define TEN_BIT_ADDR_DEFAULT 0xF000 52 #define TEN_BIT_ADDR_MASK 0xF0 53 #define PCH_START 0x0020 54 #define PCH_RESTART 0x0004 55 #define PCH_ESR_START 0x0001 56 #define PCH_BUFF_START 0x1 57 #define PCH_REPSTART 0x0004 58 #define PCH_ACK 0x0008 59 #define PCH_GETACK 0x0001 60 #define CLR_REG 0x0 61 #define I2C_RD 0x1 62 #define I2CMCF_BIT 0x0080 63 #define I2CMIF_BIT 0x0002 64 #define I2CMAL_BIT 0x0010 65 #define I2CBMFI_BIT 0x0001 66 #define I2CBMAL_BIT 0x0002 67 #define I2CBMNA_BIT 0x0004 68 #define I2CBMTO_BIT 0x0008 69 #define I2CBMIS_BIT 0x0010 70 #define I2CESRFI_BIT 0X0001 71 #define I2CESRTO_BIT 0x0002 72 #define I2CESRFIIE_BIT 0x1 73 #define I2CESRTOIE_BIT 0x2 74 #define I2CBMDZ_BIT 0x0040 75 #define I2CBMAG_BIT 0x0020 76 #define I2CMBB_BIT 0x0020 77 #define BUFFER_MODE_MASK (I2CBMFI_BIT | I2CBMAL_BIT | I2CBMNA_BIT | \ 78 I2CBMTO_BIT | I2CBMIS_BIT) 79 #define I2C_ADDR_MSK 0xFF 80 #define I2C_MSB_2B_MSK 0x300 81 #define FAST_MODE_CLK 400 82 #define FAST_MODE_EN 0x0001 83 #define SUB_ADDR_LEN_MAX 4 84 #define BUF_LEN_MAX 32 85 #define PCH_BUFFER_MODE 0x1 86 #define EEPROM_SW_RST_MODE 0x0002 87 #define NORMAL_INTR_ENBL 0x0300 88 #define EEPROM_RST_INTR_ENBL (I2CESRFIIE_BIT | I2CESRTOIE_BIT) 89 #define EEPROM_RST_INTR_DISBL 0x0 90 #define BUFFER_MODE_INTR_ENBL 0x001F 91 #define BUFFER_MODE_INTR_DISBL 0x0 92 #define NORMAL_MODE 0x0 93 #define BUFFER_MODE 0x1 94 #define EEPROM_SR_MODE 0x2 95 #define I2C_TX_MODE 0x0010 96 #define PCH_BUF_TX 0xFFF7 97 #define PCH_BUF_RD 0x0008 98 #define I2C_ERROR_MASK (I2CESRTO_EVENT | I2CBMIS_EVENT | I2CBMTO_EVENT | \ 99 I2CBMNA_EVENT | I2CBMAL_EVENT | I2CMAL_EVENT) 100 #define I2CMAL_EVENT 0x0001 101 #define I2CMCF_EVENT 0x0002 102 #define I2CBMFI_EVENT 0x0004 103 #define I2CBMAL_EVENT 0x0008 104 #define I2CBMNA_EVENT 0x0010 105 #define I2CBMTO_EVENT 0x0020 106 #define I2CBMIS_EVENT 0x0040 107 #define I2CESRFI_EVENT 0x0080 108 #define I2CESRTO_EVENT 0x0100 109 #define PCI_DEVICE_ID_PCH_I2C 0x8817 110 111 #define pch_dbg(adap, fmt, arg...) \ 112 dev_dbg(adap->pch_adapter.dev.parent, "%s :" fmt, __func__, ##arg) 113 114 #define pch_err(adap, fmt, arg...) \ 115 dev_err(adap->pch_adapter.dev.parent, "%s :" fmt, __func__, ##arg) 116 117 #define pch_pci_err(pdev, fmt, arg...) \ 118 dev_err(&pdev->dev, "%s :" fmt, __func__, ##arg) 119 120 #define pch_pci_dbg(pdev, fmt, arg...) \ 121 dev_dbg(&pdev->dev, "%s :" fmt, __func__, ##arg) 122 123 /* 124 Set the number of I2C instance max 125 Intel EG20T PCH : 1ch 126 LAPIS Semiconductor ML7213 IOH : 2ch 127 LAPIS Semiconductor ML7831 IOH : 1ch 128 */ 129 #define PCH_I2C_MAX_DEV 2 130 131 /** 132 * struct i2c_algo_pch_data - for I2C driver functionalities 133 * @pch_adapter: stores the reference to i2c_adapter structure 134 * @p_adapter_info: stores the reference to adapter_info structure 135 * @pch_base_address: specifies the remapped base address 136 * @pch_buff_mode_en: specifies if buffer mode is enabled 137 * @pch_event_flag: specifies occurrence of interrupt events 138 * @pch_i2c_xfer_in_progress: specifies whether the transfer is completed 139 */ 140 struct i2c_algo_pch_data { 141 struct i2c_adapter pch_adapter; 142 struct adapter_info *p_adapter_info; 143 void __iomem *pch_base_address; 144 int pch_buff_mode_en; 145 u32 pch_event_flag; 146 bool pch_i2c_xfer_in_progress; 147 }; 148 149 /** 150 * struct adapter_info - This structure holds the adapter information for the 151 PCH i2c controller 152 * @pch_data: stores a list of i2c_algo_pch_data 153 * @pch_i2c_suspended: specifies whether the system is suspended or not 154 * perhaps with more lines and words. 155 * @ch_num: specifies the number of i2c instance 156 * 157 * pch_data has as many elements as maximum I2C channels 158 */ 159 struct adapter_info { 160 struct i2c_algo_pch_data pch_data[PCH_I2C_MAX_DEV]; 161 bool pch_i2c_suspended; 162 int ch_num; 163 }; 164 165 166 static int pch_i2c_speed = 100; /* I2C bus speed in Kbps */ 167 static int pch_clk = 50000; /* specifies I2C clock speed in KHz */ 168 static wait_queue_head_t pch_event; 169 static DEFINE_MUTEX(pch_mutex); 170 171 /* Definition for ML7213 by LAPIS Semiconductor */ 172 #define PCI_DEVICE_ID_ML7213_I2C 0x802D 173 #define PCI_DEVICE_ID_ML7223_I2C 0x8010 174 #define PCI_DEVICE_ID_ML7831_I2C 0x8817 175 176 static const struct pci_device_id pch_pcidev_id[] = { 177 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_PCH_I2C), 1, }, 178 { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_I2C), 2, }, 179 { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_I2C), 1, }, 180 { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7831_I2C), 1, }, 181 {0,} 182 }; 183 MODULE_DEVICE_TABLE(pci, pch_pcidev_id); 184 185 static irqreturn_t pch_i2c_handler(int irq, void *pData); 186 187 static inline void pch_setbit(void __iomem *addr, u32 offset, u32 bitmask) 188 { 189 u32 val; 190 val = ioread32(addr + offset); 191 val |= bitmask; 192 iowrite32(val, addr + offset); 193 } 194 195 static inline void pch_clrbit(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 /** 204 * pch_i2c_init() - hardware initialization of I2C module 205 * @adap: Pointer to struct i2c_algo_pch_data. 206 */ 207 static void pch_i2c_init(struct i2c_algo_pch_data *adap) 208 { 209 void __iomem *p = adap->pch_base_address; 210 u32 pch_i2cbc; 211 u32 pch_i2ctmr; 212 u32 reg_value; 213 214 /* reset I2C controller */ 215 iowrite32(0x01, p + PCH_I2CSRST); 216 msleep(20); 217 iowrite32(0x0, p + PCH_I2CSRST); 218 219 /* Initialize I2C registers */ 220 iowrite32(0x21, p + PCH_I2CNF); 221 222 pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_I2CCTL_I2CMEN); 223 224 if (pch_i2c_speed != 400) 225 pch_i2c_speed = 100; 226 227 reg_value = PCH_I2CCTL_I2CMEN; 228 if (pch_i2c_speed == FAST_MODE_CLK) { 229 reg_value |= FAST_MODE_EN; 230 pch_dbg(adap, "Fast mode enabled\n"); 231 } 232 233 if (pch_clk > PCH_MAX_CLK) 234 pch_clk = 62500; 235 236 pch_i2cbc = (pch_clk + (pch_i2c_speed * 4)) / (pch_i2c_speed * 8); 237 /* Set transfer speed in I2CBC */ 238 iowrite32(pch_i2cbc, p + PCH_I2CBC); 239 240 pch_i2ctmr = (pch_clk) / 8; 241 iowrite32(pch_i2ctmr, p + PCH_I2CTMR); 242 243 reg_value |= NORMAL_INTR_ENBL; /* Enable interrupts in normal mode */ 244 iowrite32(reg_value, p + PCH_I2CCTL); 245 246 pch_dbg(adap, 247 "I2CCTL=%x pch_i2cbc=%x pch_i2ctmr=%x Enable interrupts\n", 248 ioread32(p + PCH_I2CCTL), pch_i2cbc, pch_i2ctmr); 249 250 init_waitqueue_head(&pch_event); 251 } 252 253 /** 254 * pch_i2c_wait_for_bus_idle() - check the status of bus. 255 * @adap: Pointer to struct i2c_algo_pch_data. 256 * @timeout: waiting time counter (ms). 257 */ 258 static s32 pch_i2c_wait_for_bus_idle(struct i2c_algo_pch_data *adap, 259 s32 timeout) 260 { 261 void __iomem *p = adap->pch_base_address; 262 int schedule = 0; 263 unsigned long end = jiffies + msecs_to_jiffies(timeout); 264 265 while (ioread32(p + PCH_I2CSR) & I2CMBB_BIT) { 266 if (time_after(jiffies, end)) { 267 pch_dbg(adap, "I2CSR = %x\n", ioread32(p + PCH_I2CSR)); 268 pch_err(adap, "%s: Timeout Error.return%d\n", 269 __func__, -ETIME); 270 pch_i2c_init(adap); 271 272 return -ETIME; 273 } 274 275 if (!schedule) 276 /* Retry after some usecs */ 277 udelay(5); 278 else 279 /* Wait a bit more without consuming CPU */ 280 usleep_range(20, 1000); 281 282 schedule = 1; 283 } 284 285 return 0; 286 } 287 288 /** 289 * pch_i2c_start() - Generate I2C start condition in normal mode. 290 * @adap: Pointer to struct i2c_algo_pch_data. 291 * 292 * Generate I2C start condition in normal mode by setting I2CCTL.I2CMSTA to 1. 293 */ 294 static void pch_i2c_start(struct i2c_algo_pch_data *adap) 295 { 296 void __iomem *p = adap->pch_base_address; 297 pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL)); 298 pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_START); 299 } 300 301 /** 302 * pch_i2c_stop() - generate stop condition in normal mode. 303 * @adap: Pointer to struct i2c_algo_pch_data. 304 */ 305 static void pch_i2c_stop(struct i2c_algo_pch_data *adap) 306 { 307 void __iomem *p = adap->pch_base_address; 308 pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL)); 309 /* clear the start bit */ 310 pch_clrbit(adap->pch_base_address, PCH_I2CCTL, PCH_START); 311 } 312 313 static int pch_i2c_wait_for_check_xfer(struct i2c_algo_pch_data *adap) 314 { 315 long ret; 316 void __iomem *p = adap->pch_base_address; 317 318 ret = wait_event_timeout(pch_event, 319 (adap->pch_event_flag != 0), msecs_to_jiffies(1000)); 320 if (!ret) { 321 pch_err(adap, "%s:wait-event timeout\n", __func__); 322 adap->pch_event_flag = 0; 323 pch_i2c_stop(adap); 324 pch_i2c_init(adap); 325 return -ETIMEDOUT; 326 } 327 328 if (adap->pch_event_flag & I2C_ERROR_MASK) { 329 pch_err(adap, "Lost Arbitration\n"); 330 adap->pch_event_flag = 0; 331 pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMAL_BIT); 332 pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMIF_BIT); 333 pch_i2c_init(adap); 334 return -EAGAIN; 335 } 336 337 adap->pch_event_flag = 0; 338 339 if (ioread32(p + PCH_I2CSR) & PCH_GETACK) { 340 pch_dbg(adap, "Receive NACK for slave address setting\n"); 341 return -ENXIO; 342 } 343 344 return 0; 345 } 346 347 /** 348 * pch_i2c_repstart() - generate repeated start condition in normal mode 349 * @adap: Pointer to struct i2c_algo_pch_data. 350 */ 351 static void pch_i2c_repstart(struct i2c_algo_pch_data *adap) 352 { 353 void __iomem *p = adap->pch_base_address; 354 pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL)); 355 pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_REPSTART); 356 } 357 358 /** 359 * pch_i2c_writebytes() - write data to I2C bus in normal mode 360 * @i2c_adap: Pointer to the struct i2c_adapter. 361 * @last: specifies whether last message or not. 362 * In the case of compound mode it will be 1 for last message, 363 * otherwise 0. 364 * @first: specifies whether first message or not. 365 * 1 for first message otherwise 0. 366 */ 367 static s32 pch_i2c_writebytes(struct i2c_adapter *i2c_adap, 368 struct i2c_msg *msgs, u32 last, u32 first) 369 { 370 struct i2c_algo_pch_data *adap = i2c_adap->algo_data; 371 u8 *buf; 372 u32 length; 373 u32 addr; 374 u32 addr_2_msb; 375 u32 addr_8_lsb; 376 s32 wrcount; 377 s32 rtn; 378 void __iomem *p = adap->pch_base_address; 379 380 length = msgs->len; 381 buf = msgs->buf; 382 addr = msgs->addr; 383 384 /* enable master tx */ 385 pch_setbit(adap->pch_base_address, PCH_I2CCTL, I2C_TX_MODE); 386 387 pch_dbg(adap, "I2CCTL = %x msgs->len = %d\n", ioread32(p + PCH_I2CCTL), 388 length); 389 390 if (first) { 391 if (pch_i2c_wait_for_bus_idle(adap, BUS_IDLE_TIMEOUT) == -ETIME) 392 return -ETIME; 393 } 394 395 if (msgs->flags & I2C_M_TEN) { 396 addr_2_msb = ((addr & I2C_MSB_2B_MSK) >> 7) & 0x06; 397 iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK, p + PCH_I2CDR); 398 if (first) 399 pch_i2c_start(adap); 400 401 rtn = pch_i2c_wait_for_check_xfer(adap); 402 if (rtn) 403 return rtn; 404 405 addr_8_lsb = (addr & I2C_ADDR_MSK); 406 iowrite32(addr_8_lsb, p + PCH_I2CDR); 407 } else { 408 /* set 7 bit slave address and R/W bit as 0 */ 409 iowrite32(i2c_8bit_addr_from_msg(msgs), p + PCH_I2CDR); 410 if (first) 411 pch_i2c_start(adap); 412 } 413 414 rtn = pch_i2c_wait_for_check_xfer(adap); 415 if (rtn) 416 return rtn; 417 418 for (wrcount = 0; wrcount < length; ++wrcount) { 419 /* write buffer value to I2C data register */ 420 iowrite32(buf[wrcount], p + PCH_I2CDR); 421 pch_dbg(adap, "writing %x to Data register\n", buf[wrcount]); 422 423 rtn = pch_i2c_wait_for_check_xfer(adap); 424 if (rtn) 425 return rtn; 426 427 pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMCF_BIT); 428 pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMIF_BIT); 429 } 430 431 /* check if this is the last message */ 432 if (last) 433 pch_i2c_stop(adap); 434 else 435 pch_i2c_repstart(adap); 436 437 pch_dbg(adap, "return=%d\n", wrcount); 438 439 return wrcount; 440 } 441 442 /** 443 * pch_i2c_sendack() - send ACK 444 * @adap: Pointer to struct i2c_algo_pch_data. 445 */ 446 static void pch_i2c_sendack(struct i2c_algo_pch_data *adap) 447 { 448 void __iomem *p = adap->pch_base_address; 449 pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL)); 450 pch_clrbit(adap->pch_base_address, PCH_I2CCTL, PCH_ACK); 451 } 452 453 /** 454 * pch_i2c_sendnack() - send NACK 455 * @adap: Pointer to struct i2c_algo_pch_data. 456 */ 457 static void pch_i2c_sendnack(struct i2c_algo_pch_data *adap) 458 { 459 void __iomem *p = adap->pch_base_address; 460 pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL)); 461 pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_ACK); 462 } 463 464 /** 465 * pch_i2c_restart() - Generate I2C restart condition in normal mode. 466 * @adap: Pointer to struct i2c_algo_pch_data. 467 * 468 * Generate I2C restart condition in normal mode by setting I2CCTL.I2CRSTA. 469 */ 470 static void pch_i2c_restart(struct i2c_algo_pch_data *adap) 471 { 472 void __iomem *p = adap->pch_base_address; 473 pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL)); 474 pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_RESTART); 475 } 476 477 /** 478 * pch_i2c_readbytes() - read data from I2C bus in normal mode. 479 * @i2c_adap: Pointer to the struct i2c_adapter. 480 * @msgs: Pointer to i2c_msg structure. 481 * @last: specifies whether last message or not. 482 * @first: specifies whether first message or not. 483 */ 484 static s32 pch_i2c_readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, 485 u32 last, u32 first) 486 { 487 struct i2c_algo_pch_data *adap = i2c_adap->algo_data; 488 489 u8 *buf; 490 u32 count; 491 u32 length; 492 u32 addr; 493 u32 addr_2_msb; 494 u32 addr_8_lsb; 495 void __iomem *p = adap->pch_base_address; 496 s32 rtn; 497 498 length = msgs->len; 499 buf = msgs->buf; 500 addr = msgs->addr; 501 502 /* enable master reception */ 503 pch_clrbit(adap->pch_base_address, PCH_I2CCTL, I2C_TX_MODE); 504 505 if (first) { 506 if (pch_i2c_wait_for_bus_idle(adap, BUS_IDLE_TIMEOUT) == -ETIME) 507 return -ETIME; 508 } 509 510 if (msgs->flags & I2C_M_TEN) { 511 addr_2_msb = ((addr & I2C_MSB_2B_MSK) >> 7); 512 iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK, p + PCH_I2CDR); 513 if (first) 514 pch_i2c_start(adap); 515 516 rtn = pch_i2c_wait_for_check_xfer(adap); 517 if (rtn) 518 return rtn; 519 520 addr_8_lsb = (addr & I2C_ADDR_MSK); 521 iowrite32(addr_8_lsb, p + PCH_I2CDR); 522 523 pch_i2c_restart(adap); 524 525 rtn = pch_i2c_wait_for_check_xfer(adap); 526 if (rtn) 527 return rtn; 528 529 addr_2_msb |= I2C_RD; 530 iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK, p + PCH_I2CDR); 531 } else { 532 /* 7 address bits + R/W bit */ 533 iowrite32(i2c_8bit_addr_from_msg(msgs), p + PCH_I2CDR); 534 } 535 536 /* check if it is the first message */ 537 if (first) 538 pch_i2c_start(adap); 539 540 rtn = pch_i2c_wait_for_check_xfer(adap); 541 if (rtn) 542 return rtn; 543 544 if (length == 0) { 545 pch_i2c_stop(adap); 546 ioread32(p + PCH_I2CDR); /* Dummy read needs */ 547 548 count = length; 549 } else { 550 int read_index; 551 int loop; 552 pch_i2c_sendack(adap); 553 554 /* Dummy read */ 555 for (loop = 1, read_index = 0; loop < length; loop++) { 556 buf[read_index] = ioread32(p + PCH_I2CDR); 557 558 if (loop != 1) 559 read_index++; 560 561 rtn = pch_i2c_wait_for_check_xfer(adap); 562 if (rtn) 563 return rtn; 564 } /* end for */ 565 566 pch_i2c_sendnack(adap); 567 568 buf[read_index] = ioread32(p + PCH_I2CDR); /* Read final - 1 */ 569 570 if (length != 1) 571 read_index++; 572 573 rtn = pch_i2c_wait_for_check_xfer(adap); 574 if (rtn) 575 return rtn; 576 577 if (last) 578 pch_i2c_stop(adap); 579 else 580 pch_i2c_repstart(adap); 581 582 buf[read_index++] = ioread32(p + PCH_I2CDR); /* Read Final */ 583 count = read_index; 584 } 585 586 return count; 587 } 588 589 /** 590 * pch_i2c_cb() - Interrupt handler Call back function 591 * @adap: Pointer to struct i2c_algo_pch_data. 592 */ 593 static void pch_i2c_cb(struct i2c_algo_pch_data *adap) 594 { 595 u32 sts; 596 void __iomem *p = adap->pch_base_address; 597 598 sts = ioread32(p + PCH_I2CSR); 599 sts &= (I2CMAL_BIT | I2CMCF_BIT | I2CMIF_BIT); 600 if (sts & I2CMAL_BIT) 601 adap->pch_event_flag |= I2CMAL_EVENT; 602 603 if (sts & I2CMCF_BIT) 604 adap->pch_event_flag |= I2CMCF_EVENT; 605 606 /* clear the applicable bits */ 607 pch_clrbit(adap->pch_base_address, PCH_I2CSR, sts); 608 609 pch_dbg(adap, "PCH_I2CSR = %x\n", ioread32(p + PCH_I2CSR)); 610 611 wake_up(&pch_event); 612 } 613 614 /** 615 * pch_i2c_handler() - interrupt handler for the PCH I2C controller 616 * @irq: irq number. 617 * @pData: cookie passed back to the handler function. 618 */ 619 static irqreturn_t pch_i2c_handler(int irq, void *pData) 620 { 621 u32 reg_val; 622 int flag; 623 int i; 624 struct adapter_info *adap_info = pData; 625 void __iomem *p; 626 u32 mode; 627 628 for (i = 0, flag = 0; i < adap_info->ch_num; i++) { 629 p = adap_info->pch_data[i].pch_base_address; 630 mode = ioread32(p + PCH_I2CMOD); 631 mode &= BUFFER_MODE | EEPROM_SR_MODE; 632 if (mode != NORMAL_MODE) { 633 pch_err(adap_info->pch_data, 634 "I2C-%d mode(%d) is not supported\n", mode, i); 635 continue; 636 } 637 reg_val = ioread32(p + PCH_I2CSR); 638 if (reg_val & (I2CMAL_BIT | I2CMCF_BIT | I2CMIF_BIT)) { 639 pch_i2c_cb(&adap_info->pch_data[i]); 640 flag = 1; 641 } 642 } 643 644 return flag ? IRQ_HANDLED : IRQ_NONE; 645 } 646 647 /** 648 * pch_i2c_xfer() - Reading adnd writing data through I2C bus 649 * @i2c_adap: Pointer to the struct i2c_adapter. 650 * @msgs: Pointer to i2c_msg structure. 651 * @num: number of messages. 652 */ 653 static s32 pch_i2c_xfer(struct i2c_adapter *i2c_adap, 654 struct i2c_msg *msgs, s32 num) 655 { 656 struct i2c_msg *pmsg; 657 u32 i = 0; 658 u32 status; 659 s32 ret; 660 661 struct i2c_algo_pch_data *adap = i2c_adap->algo_data; 662 663 ret = mutex_lock_interruptible(&pch_mutex); 664 if (ret) 665 return ret; 666 667 if (adap->p_adapter_info->pch_i2c_suspended) { 668 mutex_unlock(&pch_mutex); 669 return -EBUSY; 670 } 671 672 pch_dbg(adap, "adap->p_adapter_info->pch_i2c_suspended is %d\n", 673 adap->p_adapter_info->pch_i2c_suspended); 674 /* transfer not completed */ 675 adap->pch_i2c_xfer_in_progress = true; 676 677 for (i = 0; i < num && ret >= 0; i++) { 678 pmsg = &msgs[i]; 679 pmsg->flags |= adap->pch_buff_mode_en; 680 status = pmsg->flags; 681 pch_dbg(adap, 682 "After invoking I2C_MODE_SEL :flag= 0x%x\n", status); 683 684 if ((status & (I2C_M_RD)) != false) { 685 ret = pch_i2c_readbytes(i2c_adap, pmsg, (i + 1 == num), 686 (i == 0)); 687 } else { 688 ret = pch_i2c_writebytes(i2c_adap, pmsg, (i + 1 == num), 689 (i == 0)); 690 } 691 } 692 693 adap->pch_i2c_xfer_in_progress = false; /* transfer completed */ 694 695 mutex_unlock(&pch_mutex); 696 697 return (ret < 0) ? ret : num; 698 } 699 700 /** 701 * pch_i2c_func() - return the functionality of the I2C driver 702 * @adap: Pointer to struct i2c_algo_pch_data. 703 */ 704 static u32 pch_i2c_func(struct i2c_adapter *adap) 705 { 706 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR; 707 } 708 709 static const struct i2c_algorithm pch_algorithm = { 710 .master_xfer = pch_i2c_xfer, 711 .functionality = pch_i2c_func 712 }; 713 714 /** 715 * pch_i2c_disbl_int() - Disable PCH I2C interrupts 716 * @adap: Pointer to struct i2c_algo_pch_data. 717 */ 718 static void pch_i2c_disbl_int(struct i2c_algo_pch_data *adap) 719 { 720 void __iomem *p = adap->pch_base_address; 721 722 pch_clrbit(adap->pch_base_address, PCH_I2CCTL, NORMAL_INTR_ENBL); 723 724 iowrite32(EEPROM_RST_INTR_DISBL, p + PCH_I2CESRMSK); 725 726 iowrite32(BUFFER_MODE_INTR_DISBL, p + PCH_I2CBUFMSK); 727 } 728 729 static int pch_i2c_probe(struct pci_dev *pdev, 730 const struct pci_device_id *id) 731 { 732 void __iomem *base_addr; 733 int ret; 734 int i, j; 735 struct adapter_info *adap_info; 736 struct i2c_adapter *pch_adap; 737 738 pch_pci_dbg(pdev, "Entered.\n"); 739 740 adap_info = kzalloc((sizeof(struct adapter_info)), GFP_KERNEL); 741 if (adap_info == NULL) 742 return -ENOMEM; 743 744 ret = pci_enable_device(pdev); 745 if (ret) { 746 pch_pci_err(pdev, "pci_enable_device FAILED\n"); 747 goto err_pci_enable; 748 } 749 750 ret = pci_request_regions(pdev, KBUILD_MODNAME); 751 if (ret) { 752 pch_pci_err(pdev, "pci_request_regions FAILED\n"); 753 goto err_pci_req; 754 } 755 756 base_addr = pci_iomap(pdev, 1, 0); 757 758 if (base_addr == NULL) { 759 pch_pci_err(pdev, "pci_iomap FAILED\n"); 760 ret = -ENOMEM; 761 goto err_pci_iomap; 762 } 763 764 /* Set the number of I2C channel instance */ 765 adap_info->ch_num = id->driver_data; 766 767 for (i = 0; i < adap_info->ch_num; i++) { 768 pch_adap = &adap_info->pch_data[i].pch_adapter; 769 adap_info->pch_i2c_suspended = false; 770 771 adap_info->pch_data[i].p_adapter_info = adap_info; 772 773 pch_adap->owner = THIS_MODULE; 774 pch_adap->class = I2C_CLASS_HWMON; 775 strlcpy(pch_adap->name, KBUILD_MODNAME, sizeof(pch_adap->name)); 776 pch_adap->algo = &pch_algorithm; 777 pch_adap->algo_data = &adap_info->pch_data[i]; 778 779 /* base_addr + offset; */ 780 adap_info->pch_data[i].pch_base_address = base_addr + 0x100 * i; 781 782 pch_adap->dev.of_node = pdev->dev.of_node; 783 pch_adap->dev.parent = &pdev->dev; 784 } 785 786 ret = request_irq(pdev->irq, pch_i2c_handler, IRQF_SHARED, 787 KBUILD_MODNAME, adap_info); 788 if (ret) { 789 pch_pci_err(pdev, "request_irq FAILED\n"); 790 goto err_request_irq; 791 } 792 793 for (i = 0; i < adap_info->ch_num; i++) { 794 pch_adap = &adap_info->pch_data[i].pch_adapter; 795 796 pch_i2c_init(&adap_info->pch_data[i]); 797 798 pch_adap->nr = i; 799 ret = i2c_add_numbered_adapter(pch_adap); 800 if (ret) { 801 pch_pci_err(pdev, "i2c_add_adapter[ch:%d] FAILED\n", i); 802 goto err_add_adapter; 803 } 804 } 805 806 pci_set_drvdata(pdev, adap_info); 807 pch_pci_dbg(pdev, "returns %d.\n", ret); 808 return 0; 809 810 err_add_adapter: 811 for (j = 0; j < i; j++) 812 i2c_del_adapter(&adap_info->pch_data[j].pch_adapter); 813 free_irq(pdev->irq, adap_info); 814 err_request_irq: 815 pci_iounmap(pdev, base_addr); 816 err_pci_iomap: 817 pci_release_regions(pdev); 818 err_pci_req: 819 pci_disable_device(pdev); 820 err_pci_enable: 821 kfree(adap_info); 822 return ret; 823 } 824 825 static void pch_i2c_remove(struct pci_dev *pdev) 826 { 827 int i; 828 struct adapter_info *adap_info = pci_get_drvdata(pdev); 829 830 free_irq(pdev->irq, adap_info); 831 832 for (i = 0; i < adap_info->ch_num; i++) { 833 pch_i2c_disbl_int(&adap_info->pch_data[i]); 834 i2c_del_adapter(&adap_info->pch_data[i].pch_adapter); 835 } 836 837 if (adap_info->pch_data[0].pch_base_address) 838 pci_iounmap(pdev, adap_info->pch_data[0].pch_base_address); 839 840 for (i = 0; i < adap_info->ch_num; i++) 841 adap_info->pch_data[i].pch_base_address = NULL; 842 843 pci_release_regions(pdev); 844 845 pci_disable_device(pdev); 846 kfree(adap_info); 847 } 848 849 static int __maybe_unused pch_i2c_suspend(struct device *dev) 850 { 851 int i; 852 struct pci_dev *pdev = to_pci_dev(dev); 853 struct adapter_info *adap_info = pci_get_drvdata(pdev); 854 void __iomem *p = adap_info->pch_data[0].pch_base_address; 855 856 adap_info->pch_i2c_suspended = true; 857 858 for (i = 0; i < adap_info->ch_num; i++) { 859 while ((adap_info->pch_data[i].pch_i2c_xfer_in_progress)) { 860 /* Wait until all channel transfers are completed */ 861 msleep(20); 862 } 863 } 864 865 /* Disable the i2c interrupts */ 866 for (i = 0; i < adap_info->ch_num; i++) 867 pch_i2c_disbl_int(&adap_info->pch_data[i]); 868 869 pch_pci_dbg(pdev, "I2CSR = %x I2CBUFSTA = %x I2CESRSTA = %x " 870 "invoked function pch_i2c_disbl_int successfully\n", 871 ioread32(p + PCH_I2CSR), ioread32(p + PCH_I2CBUFSTA), 872 ioread32(p + PCH_I2CESRSTA)); 873 874 return 0; 875 } 876 877 static int __maybe_unused pch_i2c_resume(struct device *dev) 878 { 879 int i; 880 struct adapter_info *adap_info = dev_get_drvdata(dev); 881 882 for (i = 0; i < adap_info->ch_num; i++) 883 pch_i2c_init(&adap_info->pch_data[i]); 884 885 adap_info->pch_i2c_suspended = false; 886 887 return 0; 888 } 889 890 static SIMPLE_DEV_PM_OPS(pch_i2c_pm_ops, pch_i2c_suspend, pch_i2c_resume); 891 892 static struct pci_driver pch_pcidriver = { 893 .name = KBUILD_MODNAME, 894 .id_table = pch_pcidev_id, 895 .probe = pch_i2c_probe, 896 .remove = pch_i2c_remove, 897 .driver.pm = &pch_i2c_pm_ops, 898 }; 899 900 module_pci_driver(pch_pcidriver); 901 902 MODULE_DESCRIPTION("Intel EG20T PCH/LAPIS Semico ML7213/ML7223/ML7831 IOH I2C"); 903 MODULE_LICENSE("GPL"); 904 MODULE_AUTHOR("Tomoya MORINAGA. <tomoya.rohm@gmail.com>"); 905 module_param(pch_i2c_speed, int, (S_IRUSR | S_IWUSR)); 906 module_param(pch_clk, int, (S_IRUSR | S_IWUSR)); 907