include/i2c.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * Copyright (C) 2009 Sergey Kubushyn <ksi@koi8.net>
   4  * Copyright (C) 2009 - 2013 Heiko Schocher <hs@denx.de>
   5  * Changes for multibus/multiadapter I2C support.
   6  *
   7  * (C) Copyright 2001
   8  * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
   9  *
  10  * The original I2C interface was
  11  *   (C) 2000 by Paolo Scaffardi (arsenio@tin.it)
  12  *   AIRVENT SAM s.p.a - RIMINI(ITALY)
  13  * but has been changed substantially.
  14  */
  15
  16 #ifndef _I2C_H_
  17 #define _I2C_H_
  18
  19 /*
  20  * For now there are essentially two parts to this file - driver model
  21  * here at the top, and the older code below (with CONFIG_SYS_I2C being
  22  * most recent). The plan is to migrate everything to driver model.
  23  * The driver model structures and API are separate as they are different
  24  * enough as to be incompatible for compilation purposes.
  25  */
  26
  27 enum dm_i2c_chip_flags {
  28         DM_I2C_CHIP_10BIT       = 1 << 0, /* Use 10-bit addressing */
  29         DM_I2C_CHIP_RD_ADDRESS  = 1 << 1, /* Send address for each read byte */
  30         DM_I2C_CHIP_WR_ADDRESS  = 1 << 2, /* Send address for each write byte */
  31 };
  32
  33 struct udevice;
  34 /**
  35  * struct dm_i2c_chip - information about an i2c chip
  36  *
  37  * An I2C chip is a device on the I2C bus. It sits at a particular address
  38  * and normally supports 7-bit or 10-bit addressing.
  39  *
  40  * To obtain this structure, use dev_get_parent_platdata(dev) where dev is
  41  * the chip to examine.
  42  *
  43  * @chip_addr:  Chip address on bus
  44  * @offset_len: Length of offset in bytes. A single byte offset can
  45  *              represent up to 256 bytes. A value larger than 1 may be
  46  *              needed for larger devices.
  47  * @flags:      Flags for this chip (dm_i2c_chip_flags)
  48  * @emul: Emulator for this chip address (only used for emulation)
  49  */
  50 struct dm_i2c_chip {
  51         uint chip_addr;
  52         uint offset_len;
  53         uint flags;
  54 #ifdef CONFIG_SANDBOX
  55         struct udevice *emul;
  56         bool test_mode;
  57 #endif
  58 };
  59
  60 /**
  61  * struct dm_i2c_bus- information about an i2c bus
  62  *
  63  * An I2C bus contains 0 or more chips on it, each at its own address. The
  64  * bus can operate at different speeds (measured in Hz, typically 100KHz
  65  * or 400KHz).
  66  *
  67  * To obtain this structure, use dev_get_uclass_priv(bus) where bus is the
  68  * I2C bus udevice.
  69  *
  70  * @speed_hz: Bus speed in hertz (typically 100000)
  71  */
  72 struct dm_i2c_bus {
  73         int speed_hz;
  74 };
  75
  76 /*
  77  * Not all of these flags are implemented in the U-Boot API
  78  */
  79 enum dm_i2c_msg_flags {
  80         I2C_M_TEN               = 0x0010, /* ten-bit chip address */
  81         I2C_M_RD                = 0x0001, /* read data, from slave to master */
  82         I2C_M_STOP              = 0x8000, /* send stop after this message */
  83         I2C_M_NOSTART           = 0x4000, /* no start before this message */
  84         I2C_M_REV_DIR_ADDR      = 0x2000, /* invert polarity of R/W bit */
  85         I2C_M_IGNORE_NAK        = 0x1000, /* continue after NAK */
  86         I2C_M_NO_RD_ACK         = 0x0800, /* skip the Ack bit on reads */
  87         I2C_M_RECV_LEN          = 0x0400, /* length is first received byte */
  88 };
  89
  90 /**
  91  * struct i2c_msg - an I2C message
  92  *
  93  * @addr:       Slave address
  94  * @flags:      Flags (see enum dm_i2c_msg_flags)
  95  * @len:        Length of buffer in bytes, may be 0 for a probe
  96  * @buf:        Buffer to send/receive, or NULL if no data
  97  */
  98 struct i2c_msg {
  99         uint addr;
 100         uint flags;
 101         uint len;
 102         u8 *buf;
 103 };
 104
 105 /**
 106  * struct i2c_msg_list - a list of I2C messages
 107  *
 108  * This is called i2c_rdwr_ioctl_data in Linux but the name does not seem
 109  * appropriate in U-Boot.
 110  *
 111  * @msg:        Pointer to i2c_msg array
 112  * @nmsgs:      Number of elements in the array
 113  */
 114 struct i2c_msg_list {
 115         struct i2c_msg *msgs;
 116         uint nmsgs;
 117 };
 118
 119 /**
 120  * dm_i2c_read() - read bytes from an I2C chip
 121  *
 122  * To obtain an I2C device (called a 'chip') given the I2C bus address you
 123  * can use i2c_get_chip(). To obtain a bus by bus number use
 124  * uclass_get_device_by_seq(UCLASS_I2C, <bus number>).
 125  *
 126  * To set the address length of a devce use i2c_set_addr_len(). It
 127  * defaults to 1.
 128  *
 129  * @dev:        Chip to read from
 130  * @offset:     Offset within chip to start reading
 131  * @buffer:     Place to put data
 132  * @len:        Number of bytes to read
 133  *
 134  * @return 0 on success, -ve on failure
 135  */
 136 int dm_i2c_read(struct udevice *dev, uint offset, uint8_t *buffer, int len);
 137
 138 /**
 139  * dm_i2c_write() - write bytes to an I2C chip
 140  *
 141  * See notes for dm_i2c_read() above.
 142  *
 143  * @dev:        Chip to write to
 144  * @offset:     Offset within chip to start writing
 145  * @buffer:     Buffer containing data to write
 146  * @len:        Number of bytes to write
 147  *
 148  * @return 0 on success, -ve on failure
 149  */
 150 int dm_i2c_write(struct udevice *dev, uint offset, const uint8_t *buffer,
 151                  int len);
 152
 153 /**
 154  * dm_i2c_probe() - probe a particular chip address
 155  *
 156  * This can be useful to check for the existence of a chip on the bus.
 157  * It is typically implemented by writing the chip address to the bus
 158  * and checking that the chip replies with an ACK.
 159  *
 160  * @bus:        Bus to probe
 161  * @chip_addr:  7-bit address to probe (10-bit and others are not supported)
 162  * @chip_flags: Flags for the probe (see enum dm_i2c_chip_flags)
 163  * @devp:       Returns the device found, or NULL if none
 164  * @return 0 if a chip was found at that address, -ve if not
 165  */
 166 int dm_i2c_probe(struct udevice *bus, uint chip_addr, uint chip_flags,
 167                  struct udevice **devp);
 168
 169 /**
 170  * dm_i2c_reg_read() - Read a value from an I2C register
 171  *
 172  * This reads a single value from the given address in an I2C chip
 173  *
 174  * @dev:        Device to use for transfer
 175  * @addr:       Address to read from
 176  * @return value read, or -ve on error
 177  */
 178 int dm_i2c_reg_read(struct udevice *dev, uint offset);
 179
 180 /**
 181  * dm_i2c_reg_write() - Write a value to an I2C register
 182  *
 183  * This writes a single value to the given address in an I2C chip
 184  *
 185  * @dev:        Device to use for transfer
 186  * @addr:       Address to write to
 187  * @val:        Value to write (normally a byte)
 188  * @return 0 on success, -ve on error
 189  */
 190 int dm_i2c_reg_write(struct udevice *dev, uint offset, unsigned int val);
 191
 192 /**
 193  * dm_i2c_xfer() - Transfer messages over I2C
 194  *
 195  * This transfers a raw message. It is best to use dm_i2c_reg_read/write()
 196  * instead.
 197  *
 198  * @dev:        Device to use for transfer
 199  * @msg:        List of messages to transfer
 200  * @nmsgs:      Number of messages to transfer
 201  * @return 0 on success, -ve on error
 202  */
 203 int dm_i2c_xfer(struct udevice *dev, struct i2c_msg *msg, int nmsgs);
 204
 205 /**
 206  * dm_i2c_set_bus_speed() - set the speed of a bus
 207  *
 208  * @bus:        Bus to adjust
 209  * @speed:      Requested speed in Hz
 210  * @return 0 if OK, -EINVAL for invalid values
 211  */
 212 int dm_i2c_set_bus_speed(struct udevice *bus, unsigned int speed);
 213
 214 /**
 215  * dm_i2c_get_bus_speed() - get the speed of a bus
 216  *
 217  * @bus:        Bus to check
 218  * @return speed of selected I2C bus in Hz, -ve on error
 219  */
 220 int dm_i2c_get_bus_speed(struct udevice *bus);
 221
 222 /**
 223  * i2c_set_chip_flags() - set flags for a chip
 224  *
 225  * Typically addresses are 7 bits, but for 10-bit addresses you should set
 226  * flags to DM_I2C_CHIP_10BIT. All accesses will then use 10-bit addressing.
 227  *
 228  * @dev:        Chip to adjust
 229  * @flags:      New flags
 230  * @return 0 if OK, -EINVAL if value is unsupported, other -ve value on error
 231  */
 232 int i2c_set_chip_flags(struct udevice *dev, uint flags);
 233
 234 /**
 235  * i2c_get_chip_flags() - get flags for a chip
 236  *
 237  * @dev:        Chip to check
 238  * @flagsp:     Place to put flags
 239  * @return 0 if OK, other -ve value on error
 240  */
 241 int i2c_get_chip_flags(struct udevice *dev, uint *flagsp);
 242
 243 /**
 244  * i2c_set_offset_len() - set the offset length for a chip
 245  *
 246  * The offset used to access a chip may be up to 4 bytes long. Typically it
 247  * is only 1 byte, which is enough for chips with 256 bytes of memory or
 248  * registers. The default value is 1, but you can call this function to
 249  * change it.
 250  *
 251  * @offset_len: New offset length value (typically 1 or 2)
 252  */
 253 int i2c_set_chip_offset_len(struct udevice *dev, uint offset_len);
 254
 255 /**
 256  * i2c_get_offset_len() - get the offset length for a chip
 257  *
 258  * @return:     Current offset length value (typically 1 or 2)
 259  */
 260 int i2c_get_chip_offset_len(struct udevice *dev);
 261
 262 /**
 263  * i2c_deblock() - recover a bus that is in an unknown state
 264  *
 265  * See the deblock() method in 'struct dm_i2c_ops' for full information
 266  *
 267  * @bus:        Bus to recover
 268  * @return 0 if OK, -ve on error
 269  */
 270 int i2c_deblock(struct udevice *bus);
 271
 272 #ifdef CONFIG_DM_I2C_COMPAT
 273 /**
 274  * i2c_probe() - Compatibility function for driver model
 275  *
 276  * Calls dm_i2c_probe() on the current bus
 277  */
 278 int i2c_probe(uint8_t chip_addr);
 279
 280 /**
 281  * i2c_read() - Compatibility function for driver model
 282  *
 283  * Calls dm_i2c_read() with the device corresponding to @chip_addr, and offset
 284  * set to @addr. @alen must match the current setting for the device.
 285  */
 286 int i2c_read(uint8_t chip_addr, unsigned int addr, int alen, uint8_t *buffer,
 287              int len);
 288
 289 /**
 290  * i2c_write() - Compatibility function for driver model
 291  *
 292  * Calls dm_i2c_write() with the device corresponding to @chip_addr, and offset
 293  * set to @addr. @alen must match the current setting for the device.
 294  */
 295 int i2c_write(uint8_t chip_addr, unsigned int addr, int alen, uint8_t *buffer,
 296               int len);
 297
 298 /**
 299  * i2c_get_bus_num_fdt() - Compatibility function for driver model
 300  *
 301  * @return the bus number associated with the given device tree node
 302  */
 303 int i2c_get_bus_num_fdt(int node);
 304
 305 /**
 306  * i2c_get_bus_num() - Compatibility function for driver model
 307  *
 308  * @return the 'current' bus number
 309  */
 310 unsigned int i2c_get_bus_num(void);
 311
 312 /**
 313  * i2c_set_bus_num() - Compatibility function for driver model
 314  *
 315  * Sets the 'current' bus
 316  */
 317 int i2c_set_bus_num(unsigned int bus);
 318
 319 static inline void I2C_SET_BUS(unsigned int bus)
 320 {
 321         i2c_set_bus_num(bus);
 322 }
 323
 324 static inline unsigned int I2C_GET_BUS(void)
 325 {
 326         return i2c_get_bus_num();
 327 }
 328
 329 /**
 330  * i2c_init() - Compatibility function for driver model
 331  *
 332  * This function does nothing.
 333  */
 334 void i2c_init(int speed, int slaveaddr);
 335
 336 /**
 337  * board_i2c_init() - Compatibility function for driver model
 338  *
 339  * @param blob  Device tree blbo
 340  * @return the number of I2C bus
 341  */
 342 void board_i2c_init(const void *blob);
 343
 344 /*
 345  * Compatibility functions for driver model.
 346  */
 347 uint8_t i2c_reg_read(uint8_t addr, uint8_t reg);
 348 void i2c_reg_write(uint8_t addr, uint8_t reg, uint8_t val);
 349
 350 #endif
 351
 352 /**
 353  * struct dm_i2c_ops - driver operations for I2C uclass
 354  *
 355  * Drivers should support these operations unless otherwise noted. These
 356  * operations are intended to be used by uclass code, not directly from
 357  * other code.
 358  */
 359 struct dm_i2c_ops {
 360         /**
 361          * xfer() - transfer a list of I2C messages
 362          *
 363          * @bus:        Bus to read from
 364          * @msg:        List of messages to transfer
 365          * @nmsgs:      Number of messages in the list
 366          * @return 0 if OK, -EREMOTEIO if the slave did not ACK a byte,
 367          *      -ECOMM if the speed cannot be supported, -EPROTO if the chip
 368          *      flags cannot be supported, other -ve value on some other error
 369          */
 370         int (*xfer)(struct udevice *bus, struct i2c_msg *msg, int nmsgs);
 371
 372         /**
 373          * probe_chip() - probe for the presense of a chip address
 374          *
 375          * This function is optional. If omitted, the uclass will send a zero
 376          * length message instead.
 377          *
 378          * @bus:        Bus to probe
 379          * @chip_addr:  Chip address to probe
 380          * @chip_flags: Probe flags (enum dm_i2c_chip_flags)
 381          * @return 0 if chip was found, -EREMOTEIO if not, -ENOSYS to fall back
 382          * to default probem other -ve value on error
 383          */
 384         int (*probe_chip)(struct udevice *bus, uint chip_addr, uint chip_flags);
 385
 386         /**
 387          * set_bus_speed() - set the speed of a bus (optional)
 388          *
 389          * The bus speed value will be updated by the uclass if this function
 390          * does not return an error. This method is optional - if it is not
 391          * provided then the driver can read the speed from
 392          * dev_get_uclass_priv(bus)->speed_hz
 393          *
 394          * @bus:        Bus to adjust
 395          * @speed:      Requested speed in Hz
 396          * @return 0 if OK, -EINVAL for invalid values
 397          */
 398         int (*set_bus_speed)(struct udevice *bus, unsigned int speed);
 399
 400         /**
 401          * get_bus_speed() - get the speed of a bus (optional)
 402          *
 403          * Normally this can be provided by the uclass, but if you want your
 404          * driver to check the bus speed by looking at the hardware, you can
 405          * implement that here. This method is optional. This method would
 406          * normally be expected to return dev_get_uclass_priv(bus)->speed_hz.
 407          *
 408          * @bus:        Bus to check
 409          * @return speed of selected I2C bus in Hz, -ve on error
 410          */
 411         int (*get_bus_speed)(struct udevice *bus);
 412
 413         /**
 414          * set_flags() - set the flags for a chip (optional)
 415          *
 416          * This is generally implemented by the uclass, but drivers can
 417          * check the value to ensure that unsupported options are not used.
 418          * This method is optional. If provided, this method will always be
 419          * called when the flags change.
 420          *
 421          * @dev:        Chip to adjust
 422          * @flags:      New flags value
 423          * @return 0 if OK, -EINVAL if value is unsupported
 424          */
 425         int (*set_flags)(struct udevice *dev, uint flags);
 426
 427         /**
 428          * deblock() - recover a bus that is in an unknown state
 429          *
 430          * I2C is a synchronous protocol and resets of the processor in the
 431          * middle of an access can block the I2C Bus until a powerdown of
 432          * the full unit is done. This is because slaves can be stuck
 433          * waiting for addition bus transitions for a transaction that will
 434          * never complete. Resetting the I2C master does not help. The only
 435          * way is to force the bus through a series of transitions to make
 436          * sure that all slaves are done with the transaction. This method
 437          * performs this 'deblocking' if support by the driver.
 438          *
 439          * This method is optional.
 440          */
 441         int (*deblock)(struct udevice *bus);
 442 };
 443
 444 #define i2c_get_ops(dev)        ((struct dm_i2c_ops *)(dev)->driver->ops)
 445
 446 /**
 447  * struct i2c_mux_ops - operations for an I2C mux
 448  *
 449  * The current mux state is expected to be stored in the mux itself since
 450  * it is the only thing that knows how to make things work. The mux can
 451  * record the current state and then avoid switching unless it is necessary.
 452  * So select() can be skipped if the mux is already in the correct state.
 453  * Also deselect() can be made a nop if required.
 454  */
 455 struct i2c_mux_ops {
 456         /**
 457          * select() - select one of of I2C buses attached to a mux
 458          *
 459          * This will be called when there is no bus currently selected by the
 460          * mux. This method does not need to deselect the old bus since
 461          * deselect() will be already have been called if necessary.
 462          *
 463          * @mux:        Mux device
 464          * @bus:        I2C bus to select
 465          * @channel:    Channel number correponding to the bus to select
 466          * @return 0 if OK, -ve on error
 467          */
 468         int (*select)(struct udevice *mux, struct udevice *bus, uint channel);
 469
 470         /**
 471          * deselect() - select one of of I2C buses attached to a mux
 472          *
 473          * This is used to deselect the currently selected I2C bus.
 474          *
 475          * @mux:        Mux device
 476          * @bus:        I2C bus to deselect
 477          * @channel:    Channel number correponding to the bus to deselect
 478          * @return 0 if OK, -ve on error
 479          */
 480         int (*deselect)(struct udevice *mux, struct udevice *bus, uint channel);
 481 };
 482
 483 #define i2c_mux_get_ops(dev)    ((struct i2c_mux_ops *)(dev)->driver->ops)
 484
 485 /**
 486  * i2c_get_chip() - get a device to use to access a chip on a bus
 487  *
 488  * This returns the device for the given chip address. The device can then
 489  * be used with calls to i2c_read(), i2c_write(), i2c_probe(), etc.
 490  *
 491  * @bus:        Bus to examine
 492  * @chip_addr:  Chip address for the new device
 493  * @offset_len: Length of a register offset in bytes (normally 1)
 494  * @devp:       Returns pointer to new device if found or -ENODEV if not
 495  *              found
 496  */
 497 int i2c_get_chip(struct udevice *bus, uint chip_addr, uint offset_len,
 498                  struct udevice **devp);
 499
 500 /**
 501  * i2c_get_chip_for_busnum() - get a device to use to access a chip on
 502  *                             a bus number
 503  *
 504  * This returns the device for the given chip address on a particular bus
 505  * number.
 506  *
 507  * @busnum:     Bus number to examine
 508  * @chip_addr:  Chip address for the new device
 509  * @offset_len: Length of a register offset in bytes (normally 1)
 510  * @devp:       Returns pointer to new device if found or -ENODEV if not
 511  *              found
 512  */
 513 int i2c_get_chip_for_busnum(int busnum, int chip_addr, uint offset_len,
 514                             struct udevice **devp);
 515
 516 /**
 517  * i2c_chip_ofdata_to_platdata() - Decode standard I2C platform data
 518  *
 519  * This decodes the chip address from a device tree node and puts it into
 520  * its dm_i2c_chip structure. This should be called in your driver's
 521  * ofdata_to_platdata() method.
 522  *
 523  * @blob:       Device tree blob
 524  * @node:       Node offset to read from
 525  * @spi:        Place to put the decoded information
 526  */
 527 int i2c_chip_ofdata_to_platdata(struct udevice *dev, struct dm_i2c_chip *chip);
 528
 529 /**
 530  * i2c_dump_msgs() - Dump a list of I2C messages
 531  *
 532  * This may be useful for debugging.
 533  *
 534  * @msg:        Message list to dump
 535  * @nmsgs:      Number of messages
 536  */
 537 void i2c_dump_msgs(struct i2c_msg *msg, int nmsgs);
 538
 539 /**
 540  * i2c_emul_find() - Find an emulator for an i2c sandbox device
 541  *
 542  * This looks at the device's 'emul' phandle
 543  *
 544  * @dev: Device to find an emulator for
 545  * @emulp: Returns the associated emulator, if found *
 546  * @return 0 if OK, -ENOENT or -ENODEV if not found
 547  */
 548 int i2c_emul_find(struct udevice *dev, struct udevice **emulp);
 549
 550 /**
 551  * i2c_emul_get_device() - Find the device being emulated
 552  *
 553  * Given an emulator this returns the associated device
 554  *
 555  * @emul: Emulator for the device
 556  * @return device that @emul is emulating
 557  */
 558 struct udevice *i2c_emul_get_device(struct udevice *emul);
 559
 560 #ifndef CONFIG_DM_I2C
 561
 562 /*
 563  * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
 564  *
 565  * The implementation MUST NOT use static or global variables if the
 566  * I2C routines are used to read SDRAM configuration information
 567  * because this is done before the memories are initialized. Limited
 568  * use of stack-based variables are OK (the initial stack size is
 569  * limited).
 570  *
 571  * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
 572  */
 573
 574 /*
 575  * Configuration items.
 576  */
 577 #define I2C_RXTX_LEN    128     /* maximum tx/rx buffer length */
 578
 579 #if !defined(CONFIG_SYS_I2C_MAX_HOPS)
 580 /* no muxes used bus = i2c adapters */
 581 #define CONFIG_SYS_I2C_DIRECT_BUS       1
 582 #define CONFIG_SYS_I2C_MAX_HOPS         0
 583 #define CONFIG_SYS_NUM_I2C_BUSES        ll_entry_count(struct i2c_adapter, i2c)
 584 #else
 585 /* we use i2c muxes */
 586 #undef CONFIG_SYS_I2C_DIRECT_BUS
 587 #endif
 588
 589 /* define the I2C bus number for RTC and DTT if not already done */
 590 #if !defined(CONFIG_SYS_RTC_BUS_NUM)
 591 #define CONFIG_SYS_RTC_BUS_NUM          0
 592 #endif
 593 #if !defined(CONFIG_SYS_SPD_BUS_NUM)
 594 #define CONFIG_SYS_SPD_BUS_NUM          0
 595 #endif
 596
 597 struct i2c_adapter {
 598         void            (*init)(struct i2c_adapter *adap, int speed,
 599                                 int slaveaddr);
 600         int             (*probe)(struct i2c_adapter *adap, uint8_t chip);
 601         int             (*read)(struct i2c_adapter *adap, uint8_t chip,
 602                                 uint addr, int alen, uint8_t *buffer,
 603                                 int len);
 604         int             (*write)(struct i2c_adapter *adap, uint8_t chip,
 605                                 uint addr, int alen, uint8_t *buffer,
 606                                 int len);
 607         uint            (*set_bus_speed)(struct i2c_adapter *adap,
 608                                 uint speed);
 609         int             speed;
 610         int             waitdelay;
 611         int             slaveaddr;
 612         int             init_done;
 613         int             hwadapnr;
 614         char            *name;
 615 };
 616
 617 #define U_BOOT_I2C_MKENT_COMPLETE(_init, _probe, _read, _write, \
 618                 _set_speed, _speed, _slaveaddr, _hwadapnr, _name) \
 619         { \
 620                 .init           =       _init, \
 621                 .probe          =       _probe, \
 622                 .read           =       _read, \
 623                 .write          =       _write, \
 624                 .set_bus_speed  =       _set_speed, \
 625                 .speed          =       _speed, \
 626                 .slaveaddr      =       _slaveaddr, \
 627                 .init_done      =       0, \
 628                 .hwadapnr       =       _hwadapnr, \
 629                 .name           =       #_name \
 630 };
 631
 632 #define U_BOOT_I2C_ADAP_COMPLETE(_name, _init, _probe, _read, _write, \
 633                         _set_speed, _speed, _slaveaddr, _hwadapnr) \
 634         ll_entry_declare(struct i2c_adapter, _name, i2c) = \
 635         U_BOOT_I2C_MKENT_COMPLETE(_init, _probe, _read, _write, \
 636                  _set_speed, _speed, _slaveaddr, _hwadapnr, _name);
 637
 638 struct i2c_adapter *i2c_get_adapter(int index);
 639
 640 #ifndef CONFIG_SYS_I2C_DIRECT_BUS
 641 struct i2c_mux {
 642         int     id;
 643         char    name[16];
 644 };
 645
 646 struct i2c_next_hop {
 647         struct i2c_mux          mux;
 648         uint8_t         chip;
 649         uint8_t         channel;
 650 };
 651
 652 struct i2c_bus_hose {
 653         int     adapter;
 654         struct i2c_next_hop     next_hop[CONFIG_SYS_I2C_MAX_HOPS];
 655 };
 656 #define I2C_NULL_HOP    {{-1, ""}, 0, 0}
 657 extern struct i2c_bus_hose      i2c_bus[];
 658
 659 #define I2C_ADAPTER(bus)        i2c_bus[bus].adapter
 660 #else
 661 #define I2C_ADAPTER(bus)        bus
 662 #endif
 663 #define I2C_BUS                 gd->cur_i2c_bus
 664
 665 #define I2C_ADAP_NR(bus)        i2c_get_adapter(I2C_ADAPTER(bus))
 666 #define I2C_ADAP                I2C_ADAP_NR(gd->cur_i2c_bus)
 667 #define I2C_ADAP_HWNR           (I2C_ADAP->hwadapnr)
 668
 669 #ifndef CONFIG_SYS_I2C_DIRECT_BUS
 670 #define I2C_MUX_PCA9540_ID      1
 671 #define I2C_MUX_PCA9540         {I2C_MUX_PCA9540_ID, "PCA9540B"}
 672 #define I2C_MUX_PCA9542_ID      2
 673 #define I2C_MUX_PCA9542         {I2C_MUX_PCA9542_ID, "PCA9542A"}
 674 #define I2C_MUX_PCA9544_ID      3
 675 #define I2C_MUX_PCA9544         {I2C_MUX_PCA9544_ID, "PCA9544A"}
 676 #define I2C_MUX_PCA9547_ID      4
 677 #define I2C_MUX_PCA9547         {I2C_MUX_PCA9547_ID, "PCA9547A"}
 678 #define I2C_MUX_PCA9548_ID      5
 679 #define I2C_MUX_PCA9548         {I2C_MUX_PCA9548_ID, "PCA9548"}
 680 #endif
 681
 682 #ifndef I2C_SOFT_DECLARATIONS
 683 # if (defined(CONFIG_AT91RM9200) || \
 684         defined(CONFIG_AT91SAM9260) ||  defined(CONFIG_AT91SAM9261) || \
 685         defined(CONFIG_AT91SAM9263))
 686 #  define I2C_SOFT_DECLARATIONS at91_pio_t *pio = (at91_pio_t *) ATMEL_BASE_PIOA;
 687 # else
 688 #  define I2C_SOFT_DECLARATIONS
 689 # endif
 690 #endif
 691
 692 /*
 693  * Many boards/controllers/drivers don't support an I2C slave interface so
 694  * provide a default slave address for them for use in common code.  A real
 695  * value for CONFIG_SYS_I2C_SLAVE should be defined for any board which does
 696  * support a slave interface.
 697  */
 698 #ifndef CONFIG_SYS_I2C_SLAVE
 699 #define CONFIG_SYS_I2C_SLAVE    0xfe
 700 #endif
 701
 702 /*
 703  * Initialization, must be called once on start up, may be called
 704  * repeatedly to change the speed and slave addresses.
 705  */
 706 #ifdef CONFIG_SYS_I2C_EARLY_INIT
 707 void i2c_early_init_f(void);
 708 #endif
 709 void i2c_init(int speed, int slaveaddr);
 710 void i2c_init_board(void);
 711
 712 #ifdef CONFIG_SYS_I2C
 713 /*
 714  * i2c_get_bus_num:
 715  *
 716  *  Returns index of currently active I2C bus.  Zero-based.
 717  */
 718 unsigned int i2c_get_bus_num(void);
 719
 720 /*
 721  * i2c_set_bus_num:
 722  *
 723  *  Change the active I2C bus.  Subsequent read/write calls will
 724  *  go to this one.
 725  *
 726  *      bus - bus index, zero based
 727  *
 728  *      Returns: 0 on success, not 0 on failure
 729  *
 730  */
 731 int i2c_set_bus_num(unsigned int bus);
 732
 733 /*
 734  * i2c_init_all():
 735  *
 736  * Initializes all I2C adapters in the system. All i2c_adap structures must
 737  * be initialized beforehead with function pointers and data, including
 738  * speed and slaveaddr. Returns 0 on success, non-0 on failure.
 739  */
 740 void i2c_init_all(void);
 741
 742 /*
 743  * Probe the given I2C chip address.  Returns 0 if a chip responded,
 744  * not 0 on failure.
 745  */
 746 int i2c_probe(uint8_t chip);
 747
 748 /*
 749  * Read/Write interface:
 750  *   chip:    I2C chip address, range 0..127
 751  *   addr:    Memory (register) address within the chip
 752  *   alen:    Number of bytes to use for addr (typically 1, 2 for larger
 753  *              memories, 0 for register type devices with only one
 754  *              register)
 755  *   buffer:  Where to read/write the data
 756  *   len:     How many bytes to read/write
 757  *
 758  *   Returns: 0 on success, not 0 on failure
 759  */
 760 int i2c_read(uint8_t chip, unsigned int addr, int alen,
 761                                 uint8_t *buffer, int len);
 762
 763 int i2c_write(uint8_t chip, unsigned int addr, int alen,
 764                                 uint8_t *buffer, int len);
 765
 766 /*
 767  * Utility routines to read/write registers.
 768  */
 769 uint8_t i2c_reg_read(uint8_t addr, uint8_t reg);
 770
 771 void i2c_reg_write(uint8_t addr, uint8_t reg, uint8_t val);
 772
 773 /*
 774  * i2c_set_bus_speed:
 775  *
 776  *  Change the speed of the active I2C bus
 777  *
 778  *      speed - bus speed in Hz
 779  *
 780  *      Returns: new bus speed
 781  *
 782  */
 783 unsigned int i2c_set_bus_speed(unsigned int speed);
 784
 785 /*
 786  * i2c_get_bus_speed:
 787  *
 788  *  Returns speed of currently active I2C bus in Hz
 789  */
 790
 791 unsigned int i2c_get_bus_speed(void);
 792
 793 #else
 794
 795 /*
 796  * Probe the given I2C chip address.  Returns 0 if a chip responded,
 797  * not 0 on failure.
 798  */
 799 int i2c_probe(uchar chip);
 800
 801 /*
 802  * Read/Write interface:
 803  *   chip:    I2C chip address, range 0..127
 804  *   addr:    Memory (register) address within the chip
 805  *   alen:    Number of bytes to use for addr (typically 1, 2 for larger
 806  *              memories, 0 for register type devices with only one
 807  *              register)
 808  *   buffer:  Where to read/write the data
 809  *   len:     How many bytes to read/write
 810  *
 811  *   Returns: 0 on success, not 0 on failure
 812  */
 813 int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len);
 814 int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len);
 815
 816 /*
 817  * Utility routines to read/write registers.
 818  */
 819 static inline u8 i2c_reg_read(u8 addr, u8 reg)
 820 {
 821         u8 buf;
 822
 823 #ifdef DEBUG
 824         printf("%s: addr=0x%02x, reg=0x%02x\n", __func__, addr, reg);
 825 #endif
 826
 827         i2c_read(addr, reg, 1, &buf, 1);
 828
 829         return buf;
 830 }
 831
 832 static inline void i2c_reg_write(u8 addr, u8 reg, u8 val)
 833 {
 834 #ifdef DEBUG
 835         printf("%s: addr=0x%02x, reg=0x%02x, val=0x%02x\n",
 836                __func__, addr, reg, val);
 837 #endif
 838
 839         i2c_write(addr, reg, 1, &val, 1);
 840 }
 841
 842 /*
 843  * Functions for setting the current I2C bus and its speed
 844  */
 845
 846 /*
 847  * i2c_set_bus_num:
 848  *
 849  *  Change the active I2C bus.  Subsequent read/write calls will
 850  *  go to this one.
 851  *
 852  *      bus - bus index, zero based
 853  *
 854  *      Returns: 0 on success, not 0 on failure
 855  *
 856  */
 857 int i2c_set_bus_num(unsigned int bus);
 858
 859 /*
 860  * i2c_get_bus_num:
 861  *
 862  *  Returns index of currently active I2C bus.  Zero-based.
 863  */
 864
 865 unsigned int i2c_get_bus_num(void);
 866
 867 /*
 868  * i2c_set_bus_speed:
 869  *
 870  *  Change the speed of the active I2C bus
 871  *
 872  *      speed - bus speed in Hz
 873  *
 874  *      Returns: 0 on success, not 0 on failure
 875  *
 876  */
 877 int i2c_set_bus_speed(unsigned int);
 878
 879 /*
 880  * i2c_get_bus_speed:
 881  *
 882  *  Returns speed of currently active I2C bus in Hz
 883  */
 884
 885 unsigned int i2c_get_bus_speed(void);
 886 #endif /* CONFIG_SYS_I2C */
 887
 888 /*
 889  * only for backwardcompatibility, should go away if we switched
 890  * completely to new multibus support.
 891  */
 892 #if defined(CONFIG_SYS_I2C) || defined(CONFIG_I2C_MULTI_BUS)
 893 # if !defined(CONFIG_SYS_MAX_I2C_BUS)
 894 #  define CONFIG_SYS_MAX_I2C_BUS                2
 895 # endif
 896 # define I2C_MULTI_BUS                          1
 897 #else
 898 # define CONFIG_SYS_MAX_I2C_BUS         1
 899 # define I2C_MULTI_BUS                          0
 900 #endif
 901
 902 /* NOTE: These two functions MUST be always_inline to avoid code growth! */
 903 static inline unsigned int I2C_GET_BUS(void) __attribute__((always_inline));
 904 static inline unsigned int I2C_GET_BUS(void)
 905 {
 906         return I2C_MULTI_BUS ? i2c_get_bus_num() : 0;
 907 }
 908
 909 static inline void I2C_SET_BUS(unsigned int bus) __attribute__((always_inline));
 910 static inline void I2C_SET_BUS(unsigned int bus)
 911 {
 912         if (I2C_MULTI_BUS)
 913                 i2c_set_bus_num(bus);
 914 }
 915
 916 /* Multi I2C definitions */
 917 enum {
 918         I2C_0, I2C_1, I2C_2, I2C_3, I2C_4, I2C_5, I2C_6, I2C_7,
 919         I2C_8, I2C_9, I2C_10,
 920 };
 921
 922 /**
 923  * Get FDT values for i2c bus.
 924  *
 925  * @param blob  Device tree blbo
 926  * @return the number of I2C bus
 927  */
 928 void board_i2c_init(const void *blob);
 929
 930 /**
 931  * Find the I2C bus number by given a FDT I2C node.
 932  *
 933  * @param blob  Device tree blbo
 934  * @param node  FDT I2C node to find
 935  * @return the number of I2C bus (zero based), or -1 on error
 936  */
 937 int i2c_get_bus_num_fdt(int node);
 938
 939 /**
 940  * Reset the I2C bus represented by the given a FDT I2C node.
 941  *
 942  * @param blob  Device tree blbo
 943  * @param node  FDT I2C node to find
 944  * @return 0 if port was reset, -1 if not found
 945  */
 946 int i2c_reset_port_fdt(const void *blob, int node);
 947
 948 #endif /* !CONFIG_DM_I2C */
 949
 950 #endif  /* _I2C_H_ */