drivers/i2c/omap24xx_i2c.c

   1 /*
   2  * Basic I2C functions
   3  *
   4  * Copyright (c) 2004 Texas Instruments
   5  *
   6  * This package is free software;  you can redistribute it and/or
   7  * modify it under the terms of the license found in the file
   8  * named COPYING that should have accompanied this file.
   9  *
  10  * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  11  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  12  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  13  *
  14  * Author: Jian Zhang jzhang@ti.com, Texas Instruments
  15  *
  16  * Copyright (c) 2003 Wolfgang Denk, wd@denx.de
  17  * Rewritten to fit into the current U-Boot framework
  18  *
  19  * Adapted for OMAP2420 I2C, r-woodruff2@ti.com
  20  *
  21  * Copyright (c) 2013 Lubomir Popov <lpopov@mm-sol.com>, MM Solutions
  22  * New i2c_read, i2c_write and i2c_probe functions, tested on OMAP4
  23  * (4430/60/70), OMAP5 (5430) and AM335X (3359); should work on older
  24  * OMAPs and derivatives as well. The only anticipated exception would
  25  * be the OMAP2420, which shall require driver modification.
  26  * - Rewritten i2c_read to operate correctly with all types of chips
  27  *   (old function could not read consistent data from some I2C slaves).
  28  * - Optimized i2c_write.
  29  * - New i2c_probe, performs write access vs read. The old probe could
  30  *   hang the system under certain conditions (e.g. unconfigured pads).
  31  * - The read/write/probe functions try to identify unconfigured bus.
  32  * - Status functions now read irqstatus_raw as per TRM guidelines
  33  *   (except for OMAP243X and OMAP34XX).
  34  * - Driver now supports up to I2C5 (OMAP5).
  35  *
  36  * Copyright (c) 2014 Hannes Schmelzer <oe5hpm@oevsv.at>, B&R
  37  * - Added support for set_speed
  38  *
  39  */
  40
  41 #include <common.h>
  42 #include <dm.h>
  43 #include <i2c.h>
  44
  45 #include <asm/arch/i2c.h>
  46 #include <asm/io.h>
  47
  48 #include "omap24xx_i2c.h"
  49
  50 DECLARE_GLOBAL_DATA_PTR;
  51
  52 #define I2C_TIMEOUT     1000
  53
  54 /* Absolutely safe for status update at 100 kHz I2C: */
  55 #define I2C_WAIT        200
  56
  57 struct omap_i2c {
  58         struct udevice *clk;
  59         struct i2c *regs;
  60         unsigned int speed;
  61         int waitdelay;
  62         int clk_id;
  63 };
  64
  65 static int omap24_i2c_findpsc(u32 *pscl, u32 *psch, uint speed)
  66 {
  67         unsigned long internal_clk = 0, fclk;
  68         unsigned int prescaler;
  69
  70         /*
  71          * This method is only called for Standard and Fast Mode speeds
  72          *
  73          * For some TI SoCs it is explicitly written in TRM (e,g, SPRUHZ6G,
  74          * page 5685, Table 24-7)
  75          * that the internal I2C clock (after prescaler) should be between
  76          * 7-12 MHz (at least for Fast Mode (FS)).
  77          *
  78          * Such approach is used in v4.9 Linux kernel in:
  79          * ./drivers/i2c/busses/i2c-omap.c (omap_i2c_init function).
  80          */
  81
  82         speed /= 1000; /* convert speed to kHz */
  83
  84         if (speed > 100)
  85                 internal_clk = 9600;
  86         else
  87                 internal_clk = 4000;
  88
  89         fclk = I2C_IP_CLK / 1000;
  90         prescaler = fclk / internal_clk;
  91         prescaler = prescaler - 1;
  92
  93         if (speed > 100) {
  94                 unsigned long scl;
  95
  96                 /* Fast mode */
  97                 scl = internal_clk / speed;
  98                 *pscl = scl - (scl / 3) - I2C_FASTSPEED_SCLL_TRIM;
  99                 *psch = (scl / 3) - I2C_FASTSPEED_SCLH_TRIM;
 100         } else {
 101                 /* Standard mode */
 102                 *pscl = internal_clk / (speed * 2) - I2C_FASTSPEED_SCLL_TRIM;
 103                 *psch = internal_clk / (speed * 2) - I2C_FASTSPEED_SCLH_TRIM;
 104         }
 105
 106         debug("%s: speed [kHz]: %d psc: 0x%x sscl: 0x%x ssch: 0x%x\n",
 107               __func__, speed, prescaler, *pscl, *psch);
 108
 109         if (*pscl <= 0 || *psch <= 0 || prescaler <= 0)
 110                 return -EINVAL;
 111
 112         return prescaler;
 113 }
 114
 115 /*
 116  * Wait for the bus to be free by checking the Bus Busy (BB)
 117  * bit to become clear
 118  */
 119 static int wait_for_bb(struct i2c *i2c_base, int waitdelay)
 120 {
 121         int timeout = I2C_TIMEOUT;
 122         u16 stat;
 123
 124         writew(0xFFFF, &i2c_base->stat);        /* clear current interrupts...*/
 125 #if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX)
 126         while ((stat = readw(&i2c_base->stat) & I2C_STAT_BB) && timeout--) {
 127 #else
 128         /* Read RAW status */
 129         while ((stat = readw(&i2c_base->irqstatus_raw) &
 130                 I2C_STAT_BB) && timeout--) {
 131 #endif
 132                 writew(stat, &i2c_base->stat);
 133                 udelay(waitdelay);
 134         }
 135
 136         if (timeout <= 0) {
 137                 printf("Timed out in wait_for_bb: status=%04x\n",
 138                        stat);
 139                 return 1;
 140         }
 141         writew(0xFFFF, &i2c_base->stat);         /* clear delayed stuff*/
 142         return 0;
 143 }
 144
 145 /*
 146  * Wait for the I2C controller to complete current action
 147  * and update status
 148  */
 149 static u16 wait_for_event(struct i2c *i2c_base, int waitdelay)
 150 {
 151         u16 status;
 152         int timeout = I2C_TIMEOUT;
 153
 154         do {
 155                 udelay(waitdelay);
 156 #if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX)
 157                 status = readw(&i2c_base->stat);
 158 #else
 159                 /* Read RAW status */
 160                 status = readw(&i2c_base->irqstatus_raw);
 161 #endif
 162         } while (!(status &
 163                    (I2C_STAT_ROVR | I2C_STAT_XUDF | I2C_STAT_XRDY |
 164                     I2C_STAT_RRDY | I2C_STAT_ARDY | I2C_STAT_NACK |
 165                     I2C_STAT_AL)) && timeout--);
 166
 167         if (timeout <= 0) {
 168                 printf("Timed out in wait_for_event: status=%04x\n",
 169                        status);
 170                 /*
 171                  * If status is still 0 here, probably the bus pads have
 172                  * not been configured for I2C, and/or pull-ups are missing.
 173                  */
 174                 printf("Check if pads/pull-ups of bus are properly configured\n");
 175                 writew(0xFFFF, &i2c_base->stat);
 176                 status = 0;
 177         }
 178
 179         return status;
 180 }
 181
 182 static void flush_fifo(struct i2c *i2c_base)
 183 {
 184         u16 stat;
 185
 186         /*
 187          * note: if you try and read data when its not there or ready
 188          * you get a bus error
 189          */
 190         while (1) {
 191                 stat = readw(&i2c_base->stat);
 192                 if (stat == I2C_STAT_RRDY) {
 193                         readb(&i2c_base->data);
 194                         writew(I2C_STAT_RRDY, &i2c_base->stat);
 195                         udelay(1000);
 196                 } else
 197                         break;
 198         }
 199 }
 200
 201 static int __omap24_i2c_setspeed(struct i2c *i2c_base, uint speed,
 202                                  int *waitdelay)
 203 {
 204         int psc, fsscll = 0, fssclh = 0;
 205         int hsscll = 0, hssclh = 0;
 206         u32 scll = 0, sclh = 0;
 207
 208         if (speed >= OMAP_I2C_HIGH_SPEED) {
 209                 /* High speed */
 210                 psc = I2C_IP_CLK / I2C_INTERNAL_SAMPLING_CLK;
 211                 psc -= 1;
 212                 if (psc < I2C_PSC_MIN) {
 213                         printf("Error : I2C unsupported prescaler %d\n", psc);
 214                         return -1;
 215                 }
 216
 217                 /* For first phase of HS mode */
 218                 fsscll = I2C_INTERNAL_SAMPLING_CLK / (2 * speed);
 219
 220                 fssclh = fsscll;
 221
 222                 fsscll -= I2C_HIGHSPEED_PHASE_ONE_SCLL_TRIM;
 223                 fssclh -= I2C_HIGHSPEED_PHASE_ONE_SCLH_TRIM;
 224                 if (((fsscll < 0) || (fssclh < 0)) ||
 225                     ((fsscll > 255) || (fssclh > 255))) {
 226                         puts("Error : I2C initializing first phase clock\n");
 227                         return -1;
 228                 }
 229
 230                 /* For second phase of HS mode */
 231                 hsscll = hssclh = I2C_INTERNAL_SAMPLING_CLK / (2 * speed);
 232
 233                 hsscll -= I2C_HIGHSPEED_PHASE_TWO_SCLL_TRIM;
 234                 hssclh -= I2C_HIGHSPEED_PHASE_TWO_SCLH_TRIM;
 235                 if (((fsscll < 0) || (fssclh < 0)) ||
 236                     ((fsscll > 255) || (fssclh > 255))) {
 237                         puts("Error : I2C initializing second phase clock\n");
 238                         return -1;
 239                 }
 240
 241                 scll = (unsigned int)hsscll << 8 | (unsigned int)fsscll;
 242                 sclh = (unsigned int)hssclh << 8 | (unsigned int)fssclh;
 243
 244         } else {
 245                 /* Standard and fast speed */
 246                 psc = omap24_i2c_findpsc(&scll, &sclh, speed);
 247                 if (0 > psc) {
 248                         puts("Error : I2C initializing clock\n");
 249                         return -1;
 250                 }
 251         }
 252
 253         *waitdelay = (10000000 / speed) * 2; /* wait for 20 clkperiods */
 254         writew(0, &i2c_base->con);
 255         writew(psc, &i2c_base->psc);
 256         writew(scll, &i2c_base->scll);
 257         writew(sclh, &i2c_base->sclh);
 258         writew(I2C_CON_EN, &i2c_base->con);
 259         writew(0xFFFF, &i2c_base->stat);        /* clear all pending status */
 260
 261         return 0;
 262 }
 263
 264 static void omap24_i2c_deblock(struct i2c *i2c_base)
 265 {
 266         int i;
 267         u16 systest;
 268         u16 orgsystest;
 269
 270         /* set test mode ST_EN = 1 */
 271         orgsystest = readw(&i2c_base->systest);
 272         systest = orgsystest;
 273         /* enable testmode */
 274         systest |= I2C_SYSTEST_ST_EN;
 275         writew(systest, &i2c_base->systest);
 276         systest &= ~I2C_SYSTEST_TMODE_MASK;
 277         systest |= 3 << I2C_SYSTEST_TMODE_SHIFT;
 278         writew(systest, &i2c_base->systest);
 279
 280         /* set SCL, SDA  = 1 */
 281         systest |= I2C_SYSTEST_SCL_O | I2C_SYSTEST_SDA_O;
 282         writew(systest, &i2c_base->systest);
 283         udelay(10);
 284
 285         /* toggle scl 9 clocks */
 286         for (i = 0; i < 9; i++) {
 287                 /* SCL = 0 */
 288                 systest &= ~I2C_SYSTEST_SCL_O;
 289                 writew(systest, &i2c_base->systest);
 290                 udelay(10);
 291                 /* SCL = 1 */
 292                 systest |= I2C_SYSTEST_SCL_O;
 293                 writew(systest, &i2c_base->systest);
 294                 udelay(10);
 295         }
 296
 297         /* send stop */
 298         systest &= ~I2C_SYSTEST_SDA_O;
 299         writew(systest, &i2c_base->systest);
 300         udelay(10);
 301         systest |= I2C_SYSTEST_SCL_O | I2C_SYSTEST_SDA_O;
 302         writew(systest, &i2c_base->systest);
 303         udelay(10);
 304
 305         /* restore original mode */
 306         writew(orgsystest, &i2c_base->systest);
 307 }
 308
 309 static void __omap24_i2c_init(struct i2c *i2c_base, int speed, int slaveadd,
 310                               int *waitdelay)
 311 {
 312         int timeout = I2C_TIMEOUT;
 313         int deblock = 1;
 314
 315 retry:
 316         if (readw(&i2c_base->con) & I2C_CON_EN) {
 317                 writew(0, &i2c_base->con);
 318                 udelay(50000);
 319         }
 320
 321         writew(0x2, &i2c_base->sysc); /* for ES2 after soft reset */
 322         udelay(1000);
 323
 324         writew(I2C_CON_EN, &i2c_base->con);
 325         while (!(readw(&i2c_base->syss) & I2C_SYSS_RDONE) && timeout--) {
 326                 if (timeout <= 0) {
 327                         puts("ERROR: Timeout in soft-reset\n");
 328                         return;
 329                 }
 330                 udelay(1000);
 331         }
 332
 333         if (0 != __omap24_i2c_setspeed(i2c_base, speed, waitdelay)) {
 334                 printf("ERROR: failed to setup I2C bus-speed!\n");
 335                 return;
 336         }
 337
 338         /* own address */
 339         writew(slaveadd, &i2c_base->oa);
 340
 341 #if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX)
 342         /*
 343          * Have to enable interrupts for OMAP2/3, these IPs don't have
 344          * an 'irqstatus_raw' register and we shall have to poll 'stat'
 345          */
 346         writew(I2C_IE_XRDY_IE | I2C_IE_RRDY_IE | I2C_IE_ARDY_IE |
 347                I2C_IE_NACK_IE | I2C_IE_AL_IE, &i2c_base->ie);
 348 #endif
 349         udelay(1000);
 350         flush_fifo(i2c_base);
 351         writew(0xFFFF, &i2c_base->stat);
 352
 353         /* Handle possible failed I2C state */
 354         if (wait_for_bb(i2c_base, *waitdelay))
 355                 if (deblock == 1) {
 356                         omap24_i2c_deblock(i2c_base);
 357                         deblock = 0;
 358                         goto retry;
 359                 }
 360 }
 361
 362 /*
 363  * i2c_probe: Use write access. Allows to identify addresses that are
 364  *            write-only (like the config register of dual-port EEPROMs)
 365  */
 366 static int __omap24_i2c_probe(struct i2c *i2c_base, int waitdelay, uchar chip)
 367 {
 368         u16 status;
 369         int res = 1; /* default = fail */
 370
 371         if (chip == readw(&i2c_base->oa))
 372                 return res;
 373
 374         /* Wait until bus is free */
 375         if (wait_for_bb(i2c_base, waitdelay))
 376                 return res;
 377
 378         /* No data transfer, slave addr only */
 379         writew(chip, &i2c_base->sa);
 380         /* Stop bit needed here */
 381         writew(I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX |
 382                I2C_CON_STP, &i2c_base->con);
 383
 384         status = wait_for_event(i2c_base, waitdelay);
 385
 386         if ((status & ~I2C_STAT_XRDY) == 0 || (status & I2C_STAT_AL)) {
 387                 /*
 388                  * With current high-level command implementation, notifying
 389                  * the user shall flood the console with 127 messages. If
 390                  * silent exit is desired upon unconfigured bus, remove the
 391                  * following 'if' section:
 392                  */
 393                 if (status == I2C_STAT_XRDY)
 394                         printf("i2c_probe: pads on bus probably not configured (status=0x%x)\n",
 395                                status);
 396
 397                 goto pr_exit;
 398         }
 399
 400         /* Check for ACK (!NAK) */
 401         if (!(status & I2C_STAT_NACK)) {
 402                 res = 0;                                /* Device found */
 403                 udelay(waitdelay);/* Required by AM335X in SPL */
 404                 /* Abort transfer (force idle state) */
 405                 writew(I2C_CON_MST | I2C_CON_TRX, &i2c_base->con); /* Reset */
 406                 udelay(1000);
 407                 writew(I2C_CON_EN | I2C_CON_MST | I2C_CON_TRX |
 408                        I2C_CON_STP, &i2c_base->con);            /* STP */
 409         }
 410 pr_exit:
 411         flush_fifo(i2c_base);
 412         writew(0xFFFF, &i2c_base->stat);
 413         return res;
 414 }
 415
 416 /*
 417  * i2c_read: Function now uses a single I2C read transaction with bulk transfer
 418  *           of the requested number of bytes (note that the 'i2c md' command
 419  *           limits this to 16 bytes anyway). If CONFIG_I2C_REPEATED_START is
 420  *           defined in the board config header, this transaction shall be with
 421  *           Repeated Start (Sr) between the address and data phases; otherwise
 422  *           Stop-Start (P-S) shall be used (some I2C chips do require a P-S).
 423  *           The address (reg offset) may be 0, 1 or 2 bytes long.
 424  *           Function now reads correctly from chips that return more than one
 425  *           byte of data per addressed register (like TI temperature sensors),
 426  *           or that do not need a register address at all (such as some clock
 427  *           distributors).
 428  */
 429 static int __omap24_i2c_read(struct i2c *i2c_base, int waitdelay, uchar chip,
 430                              uint addr, int alen, uchar *buffer, int len)
 431 {
 432         int i2c_error = 0;
 433         u16 status;
 434
 435         if (alen < 0) {
 436                 puts("I2C read: addr len < 0\n");
 437                 return 1;
 438         }
 439         if (len < 0) {
 440                 puts("I2C read: data len < 0\n");
 441                 return 1;
 442         }
 443         if (buffer == NULL) {
 444                 puts("I2C read: NULL pointer passed\n");
 445                 return 1;
 446         }
 447
 448         if (alen > 2) {
 449                 printf("I2C read: addr len %d not supported\n", alen);
 450                 return 1;
 451         }
 452
 453         if (addr + len > (1 << 16)) {
 454                 puts("I2C read: address out of range\n");
 455                 return 1;
 456         }
 457
 458 #ifdef CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW
 459         /*
 460          * EEPROM chips that implement "address overflow" are ones
 461          * like Catalyst 24WC04/08/16 which has 9/10/11 bits of
 462          * address and the extra bits end up in the "chip address"
 463          * bit slots. This makes a 24WC08 (1Kbyte) chip look like
 464          * four 256 byte chips.
 465          *
 466          * Note that we consider the length of the address field to
 467          * still be one byte because the extra address bits are
 468          * hidden in the chip address.
 469          */
 470         if (alen > 0)
 471                 chip |= ((addr >> (alen * 8)) &
 472                          CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW);
 473 #endif
 474
 475         /* Wait until bus not busy */
 476         if (wait_for_bb(i2c_base, waitdelay))
 477                 return 1;
 478
 479         /* Zero, one or two bytes reg address (offset) */
 480         writew(alen, &i2c_base->cnt);
 481         /* Set slave address */
 482         writew(chip, &i2c_base->sa);
 483
 484         if (alen) {
 485                 /* Must write reg offset first */
 486 #ifdef CONFIG_I2C_REPEATED_START
 487                 /* No stop bit, use Repeated Start (Sr) */
 488                 writew(I2C_CON_EN | I2C_CON_MST | I2C_CON_STT |
 489                        I2C_CON_TRX, &i2c_base->con);
 490 #else
 491                 /* Stop - Start (P-S) */
 492                 writew(I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_STP |
 493                        I2C_CON_TRX, &i2c_base->con);
 494 #endif
 495                 /* Send register offset */
 496                 while (1) {
 497                         status = wait_for_event(i2c_base, waitdelay);
 498                         /* Try to identify bus that is not padconf'd for I2C */
 499                         if (status == I2C_STAT_XRDY) {
 500                                 i2c_error = 2;
 501                                 printf("i2c_read (addr phase): pads on bus probably not configured (status=0x%x)\n",
 502                                        status);
 503                                 goto rd_exit;
 504                         }
 505                         if (status == 0 || (status & I2C_STAT_NACK)) {
 506                                 i2c_error = 1;
 507                                 printf("i2c_read: error waiting for addr ACK (status=0x%x)\n",
 508                                        status);
 509                                 goto rd_exit;
 510                         }
 511                         if (alen) {
 512                                 if (status & I2C_STAT_XRDY) {
 513                                         alen--;
 514                                         /* Do we have to use byte access? */
 515                                         writeb((addr >> (8 * alen)) & 0xff,
 516                                                &i2c_base->data);
 517                                         writew(I2C_STAT_XRDY, &i2c_base->stat);
 518                                 }
 519                         }
 520                         if (status & I2C_STAT_ARDY) {
 521                                 writew(I2C_STAT_ARDY, &i2c_base->stat);
 522                                 break;
 523                         }
 524                 }
 525         }
 526         /* Set slave address */
 527         writew(chip, &i2c_base->sa);
 528         /* Read len bytes from slave */
 529         writew(len, &i2c_base->cnt);
 530         /* Need stop bit here */
 531         writew(I2C_CON_EN | I2C_CON_MST |
 532                I2C_CON_STT | I2C_CON_STP,
 533                &i2c_base->con);
 534
 535         /* Receive data */
 536         while (1) {
 537                 status = wait_for_event(i2c_base, waitdelay);
 538                 /*
 539                  * Try to identify bus that is not padconf'd for I2C. This
 540                  * state could be left over from previous transactions if
 541                  * the address phase is skipped due to alen=0.
 542                  */
 543                 if (status == I2C_STAT_XRDY) {
 544                         i2c_error = 2;
 545                         printf("i2c_read (data phase): pads on bus probably not configured (status=0x%x)\n",
 546                                status);
 547                         goto rd_exit;
 548                 }
 549                 if (status == 0 || (status & I2C_STAT_NACK)) {
 550                         i2c_error = 1;
 551                         goto rd_exit;
 552                 }
 553                 if (status & I2C_STAT_RRDY) {
 554                         *buffer++ = readb(&i2c_base->data);
 555                         writew(I2C_STAT_RRDY, &i2c_base->stat);
 556                 }
 557                 if (status & I2C_STAT_ARDY) {
 558                         writew(I2C_STAT_ARDY, &i2c_base->stat);
 559                         break;
 560                 }
 561         }
 562
 563 rd_exit:
 564         flush_fifo(i2c_base);
 565         writew(0xFFFF, &i2c_base->stat);
 566         return i2c_error;
 567 }
 568
 569 /* i2c_write: Address (reg offset) may be 0, 1 or 2 bytes long. */
 570 static int __omap24_i2c_write(struct i2c *i2c_base, int waitdelay, uchar chip,
 571                               uint addr, int alen, uchar *buffer, int len)
 572 {
 573         int i;
 574         u16 status;
 575         int i2c_error = 0;
 576         int timeout = I2C_TIMEOUT;
 577
 578         if (alen < 0) {
 579                 puts("I2C write: addr len < 0\n");
 580                 return 1;
 581         }
 582
 583         if (len < 0) {
 584                 puts("I2C write: data len < 0\n");
 585                 return 1;
 586         }
 587
 588         if (buffer == NULL) {
 589                 puts("I2C write: NULL pointer passed\n");
 590                 return 1;
 591         }
 592
 593         if (alen > 2) {
 594                 printf("I2C write: addr len %d not supported\n", alen);
 595                 return 1;
 596         }
 597
 598         if (addr + len > (1 << 16)) {
 599                 printf("I2C write: address 0x%x + 0x%x out of range\n",
 600                        addr, len);
 601                 return 1;
 602         }
 603
 604 #ifdef CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW
 605         /*
 606          * EEPROM chips that implement "address overflow" are ones
 607          * like Catalyst 24WC04/08/16 which has 9/10/11 bits of
 608          * address and the extra bits end up in the "chip address"
 609          * bit slots. This makes a 24WC08 (1Kbyte) chip look like
 610          * four 256 byte chips.
 611          *
 612          * Note that we consider the length of the address field to
 613          * still be one byte because the extra address bits are
 614          * hidden in the chip address.
 615          */
 616         if (alen > 0)
 617                 chip |= ((addr >> (alen * 8)) &
 618                          CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW);
 619 #endif
 620
 621         /* Wait until bus not busy */
 622         if (wait_for_bb(i2c_base, waitdelay))
 623                 return 1;
 624
 625         /* Start address phase - will write regoffset + len bytes data */
 626         writew(alen + len, &i2c_base->cnt);
 627         /* Set slave address */
 628         writew(chip, &i2c_base->sa);
 629         /* Stop bit needed here */
 630         writew(I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX |
 631                I2C_CON_STP, &i2c_base->con);
 632
 633         while (alen) {
 634                 /* Must write reg offset (one or two bytes) */
 635                 status = wait_for_event(i2c_base, waitdelay);
 636                 /* Try to identify bus that is not padconf'd for I2C */
 637                 if (status == I2C_STAT_XRDY) {
 638                         i2c_error = 2;
 639                         printf("i2c_write: pads on bus probably not configured (status=0x%x)\n",
 640                                status);
 641                         goto wr_exit;
 642                 }
 643                 if (status == 0 || (status & I2C_STAT_NACK)) {
 644                         i2c_error = 1;
 645                         printf("i2c_write: error waiting for addr ACK (status=0x%x)\n",
 646                                status);
 647                         goto wr_exit;
 648                 }
 649                 if (status & I2C_STAT_XRDY) {
 650                         alen--;
 651                         writeb((addr >> (8 * alen)) & 0xff, &i2c_base->data);
 652                         writew(I2C_STAT_XRDY, &i2c_base->stat);
 653                 } else {
 654                         i2c_error = 1;
 655                         printf("i2c_write: bus not ready for addr Tx (status=0x%x)\n",
 656                                status);
 657                         goto wr_exit;
 658                 }
 659         }
 660         /* Address phase is over, now write data */
 661         for (i = 0; i < len; i++) {
 662                 status = wait_for_event(i2c_base, waitdelay);
 663                 if (status == 0 || (status & I2C_STAT_NACK)) {
 664                         i2c_error = 1;
 665                         printf("i2c_write: error waiting for data ACK (status=0x%x)\n",
 666                                status);
 667                         goto wr_exit;
 668                 }
 669                 if (status & I2C_STAT_XRDY) {
 670                         writeb(buffer[i], &i2c_base->data);
 671                         writew(I2C_STAT_XRDY, &i2c_base->stat);
 672                 } else {
 673                         i2c_error = 1;
 674                         printf("i2c_write: bus not ready for data Tx (i=%d)\n",
 675                                i);
 676                         goto wr_exit;
 677                 }
 678         }
 679         /*
 680          * poll ARDY bit for making sure that last byte really has been
 681          * transferred on the bus.
 682          */
 683         do {
 684                 status = wait_for_event(i2c_base, waitdelay);
 685         } while (!(status & I2C_STAT_ARDY) && timeout--);
 686         if (timeout <= 0)
 687                 printf("i2c_write: timed out writig last byte!\n");
 688
 689 wr_exit:
 690         flush_fifo(i2c_base);
 691         writew(0xFFFF, &i2c_base->stat);
 692         return i2c_error;
 693 }
 694
 695 #ifndef CONFIG_DM_I2C
 696 /*
 697  * The legacy I2C functions. These need to get removed once
 698  * all users of this driver are converted to DM.
 699  */
 700 static struct i2c *omap24_get_base(struct i2c_adapter *adap)
 701 {
 702         switch (adap->hwadapnr) {
 703         case 0:
 704                 return (struct i2c *)I2C_BASE1;
 705                 break;
 706         case 1:
 707                 return (struct i2c *)I2C_BASE2;
 708                 break;
 709 #if (I2C_BUS_MAX > 2)
 710         case 2:
 711                 return (struct i2c *)I2C_BASE3;
 712                 break;
 713 #if (I2C_BUS_MAX > 3)
 714         case 3:
 715                 return (struct i2c *)I2C_BASE4;
 716                 break;
 717 #if (I2C_BUS_MAX > 4)
 718         case 4:
 719                 return (struct i2c *)I2C_BASE5;
 720                 break;
 721 #endif
 722 #endif
 723 #endif
 724         default:
 725                 printf("wrong hwadapnr: %d\n", adap->hwadapnr);
 726                 break;
 727         }
 728         return NULL;
 729 }
 730
 731
 732 static int omap24_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr,
 733                            int alen, uchar *buffer, int len)
 734 {
 735         struct i2c *i2c_base = omap24_get_base(adap);
 736
 737         return __omap24_i2c_read(i2c_base, adap->waitdelay, chip, addr,
 738                                  alen, buffer, len);
 739 }
 740
 741
 742 static int omap24_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr,
 743                             int alen, uchar *buffer, int len)
 744 {
 745         struct i2c *i2c_base = omap24_get_base(adap);
 746
 747         return __omap24_i2c_write(i2c_base, adap->waitdelay, chip, addr,
 748                                   alen, buffer, len);
 749 }
 750
 751 static uint omap24_i2c_setspeed(struct i2c_adapter *adap, uint speed)
 752 {
 753         struct i2c *i2c_base = omap24_get_base(adap);
 754         int ret;
 755
 756         ret = __omap24_i2c_setspeed(i2c_base, speed, &adap->waitdelay);
 757         if (ret) {
 758                 error("%s: set i2c speed failed\n", __func__);
 759                 return ret;
 760         }
 761
 762         adap->speed = speed;
 763
 764         return 0;
 765 }
 766
 767 static void omap24_i2c_init(struct i2c_adapter *adap, int speed, int slaveadd)
 768 {
 769         struct i2c *i2c_base = omap24_get_base(adap);
 770
 771         return __omap24_i2c_init(i2c_base, speed, slaveadd, &adap->waitdelay);
 772 }
 773
 774 static int omap24_i2c_probe(struct i2c_adapter *adap, uchar chip)
 775 {
 776         struct i2c *i2c_base = omap24_get_base(adap);
 777
 778         return __omap24_i2c_probe(i2c_base, adap->waitdelay, chip);
 779 }
 780
 781 #if !defined(CONFIG_SYS_OMAP24_I2C_SPEED1)
 782 #define CONFIG_SYS_OMAP24_I2C_SPEED1 CONFIG_SYS_OMAP24_I2C_SPEED
 783 #endif
 784 #if !defined(CONFIG_SYS_OMAP24_I2C_SLAVE1)
 785 #define CONFIG_SYS_OMAP24_I2C_SLAVE1 CONFIG_SYS_OMAP24_I2C_SLAVE
 786 #endif
 787
 788 U_BOOT_I2C_ADAP_COMPLETE(omap24_0, omap24_i2c_init, omap24_i2c_probe,
 789                          omap24_i2c_read, omap24_i2c_write, omap24_i2c_setspeed,
 790                          CONFIG_SYS_OMAP24_I2C_SPEED,
 791                          CONFIG_SYS_OMAP24_I2C_SLAVE,
 792                          0)
 793 U_BOOT_I2C_ADAP_COMPLETE(omap24_1, omap24_i2c_init, omap24_i2c_probe,
 794                          omap24_i2c_read, omap24_i2c_write, omap24_i2c_setspeed,
 795                          CONFIG_SYS_OMAP24_I2C_SPEED1,
 796                          CONFIG_SYS_OMAP24_I2C_SLAVE1,
 797                          1)
 798 #if (I2C_BUS_MAX > 2)
 799 #if !defined(CONFIG_SYS_OMAP24_I2C_SPEED2)
 800 #define CONFIG_SYS_OMAP24_I2C_SPEED2 CONFIG_SYS_OMAP24_I2C_SPEED
 801 #endif
 802 #if !defined(CONFIG_SYS_OMAP24_I2C_SLAVE2)
 803 #define CONFIG_SYS_OMAP24_I2C_SLAVE2 CONFIG_SYS_OMAP24_I2C_SLAVE
 804 #endif
 805
 806 U_BOOT_I2C_ADAP_COMPLETE(omap24_2, omap24_i2c_init, omap24_i2c_probe,
 807                          omap24_i2c_read, omap24_i2c_write, NULL,
 808                          CONFIG_SYS_OMAP24_I2C_SPEED2,
 809                          CONFIG_SYS_OMAP24_I2C_SLAVE2,
 810                          2)
 811 #if (I2C_BUS_MAX > 3)
 812 #if !defined(CONFIG_SYS_OMAP24_I2C_SPEED3)
 813 #define CONFIG_SYS_OMAP24_I2C_SPEED3 CONFIG_SYS_OMAP24_I2C_SPEED
 814 #endif
 815 #if !defined(CONFIG_SYS_OMAP24_I2C_SLAVE3)
 816 #define CONFIG_SYS_OMAP24_I2C_SLAVE3 CONFIG_SYS_OMAP24_I2C_SLAVE
 817 #endif
 818
 819 U_BOOT_I2C_ADAP_COMPLETE(omap24_3, omap24_i2c_init, omap24_i2c_probe,
 820                          omap24_i2c_read, omap24_i2c_write, NULL,
 821                          CONFIG_SYS_OMAP24_I2C_SPEED3,
 822                          CONFIG_SYS_OMAP24_I2C_SLAVE3,
 823                          3)
 824 #if (I2C_BUS_MAX > 4)
 825 #if !defined(CONFIG_SYS_OMAP24_I2C_SPEED4)
 826 #define CONFIG_SYS_OMAP24_I2C_SPEED4 CONFIG_SYS_OMAP24_I2C_SPEED
 827 #endif
 828 #if !defined(CONFIG_SYS_OMAP24_I2C_SLAVE4)
 829 #define CONFIG_SYS_OMAP24_I2C_SLAVE4 CONFIG_SYS_OMAP24_I2C_SLAVE
 830 #endif
 831
 832 U_BOOT_I2C_ADAP_COMPLETE(omap24_4, omap24_i2c_init, omap24_i2c_probe,
 833                          omap24_i2c_read, omap24_i2c_write, NULL,
 834                          CONFIG_SYS_OMAP24_I2C_SPEED4,
 835                          CONFIG_SYS_OMAP24_I2C_SLAVE4,
 836                          4)
 837 #endif
 838 #endif
 839 #endif
 840
 841 #else /* CONFIG_DM_I2C */
 842
 843 static int omap_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs)
 844 {
 845         struct omap_i2c *priv = dev_get_priv(bus);
 846         int ret;
 847
 848         debug("i2c_xfer: %d messages\n", nmsgs);
 849         for (; nmsgs > 0; nmsgs--, msg++) {
 850                 debug("i2c_xfer: chip=0x%x, len=0x%x\n", msg->addr, msg->len);
 851                 if (msg->flags & I2C_M_RD) {
 852                         ret = __omap24_i2c_read(priv->regs, priv->waitdelay,
 853                                                 msg->addr, 0, 0, msg->buf,
 854                                                 msg->len);
 855                 } else {
 856                         ret = __omap24_i2c_write(priv->regs, priv->waitdelay,
 857                                                  msg->addr, 0, 0, msg->buf,
 858                                                  msg->len);
 859                 }
 860                 if (ret) {
 861                         debug("i2c_write: error sending\n");
 862                         return -EREMOTEIO;
 863                 }
 864         }
 865
 866         return 0;
 867 }
 868
 869 static int omap_i2c_set_bus_speed(struct udevice *bus, unsigned int speed)
 870 {
 871         struct omap_i2c *priv = dev_get_priv(bus);
 872
 873         priv->speed = speed;
 874
 875         return __omap24_i2c_setspeed(priv->regs, speed, &priv->waitdelay);
 876 }
 877
 878 static int omap_i2c_probe_chip(struct udevice *bus, uint chip_addr,
 879                                      uint chip_flags)
 880 {
 881         struct omap_i2c *priv = dev_get_priv(bus);
 882
 883         return __omap24_i2c_probe(priv->regs, priv->waitdelay, chip_addr);
 884 }
 885
 886 static int omap_i2c_probe(struct udevice *bus)
 887 {
 888         struct omap_i2c *priv = dev_get_priv(bus);
 889
 890         __omap24_i2c_init(priv->regs, priv->speed, 0, &priv->waitdelay);
 891
 892         return 0;
 893 }
 894
 895 static int omap_i2c_ofdata_to_platdata(struct udevice *bus)
 896 {
 897         struct omap_i2c *priv = dev_get_priv(bus);
 898
 899         priv->regs = map_physmem(dev_get_addr(bus), sizeof(void *),
 900                                  MAP_NOCACHE);
 901         priv->speed = CONFIG_SYS_OMAP24_I2C_SPEED;
 902
 903         return 0;
 904 }
 905
 906 static const struct dm_i2c_ops omap_i2c_ops = {
 907         .xfer           = omap_i2c_xfer,
 908         .probe_chip     = omap_i2c_probe_chip,
 909         .set_bus_speed  = omap_i2c_set_bus_speed,
 910 };
 911
 912 static const struct udevice_id omap_i2c_ids[] = {
 913         { .compatible = "ti,omap4-i2c" },
 914         { }
 915 };
 916
 917 U_BOOT_DRIVER(i2c_omap) = {
 918         .name   = "i2c_omap",
 919         .id     = UCLASS_I2C,
 920         .of_match = omap_i2c_ids,
 921         .ofdata_to_platdata = omap_i2c_ofdata_to_platdata,
 922         .probe  = omap_i2c_probe,
 923         .priv_auto_alloc_size = sizeof(struct omap_i2c),
 924         .ops    = &omap_i2c_ops,
 925         .flags  = DM_FLAG_PRE_RELOC,
 926 };
 927
 928 #endif /* CONFIG_DM_I2C */