1 /* SPDX-License-Identifier: GPL-2.0+ */
5 * Changes for multibus/multiadapter I2C support.
10 * The original I2C interface was
12 * AIRVENT SAM s.p.a - RIMINI(ITALY)
13 * but has been changed substantially.
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.
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 */
33 /** enum i2c_speed_mode - standard I2C speed modes */
35 IC_SPEED_MODE_STANDARD,
37 IC_SPEED_MODE_FAST_PLUS,
39 IC_SPEED_MODE_FAST_ULTRA,
44 /** enum i2c_speed_rate - standard I2C speeds in Hz */
46 I2C_SPEED_STANDARD_RATE = 100000,
47 I2C_SPEED_FAST_RATE = 400000,
48 I2C_SPEED_FAST_PLUS_RATE = 1000000,
49 I2C_SPEED_HIGH_RATE = 3400000,
50 I2C_SPEED_FAST_ULTRA_RATE = 5000000,
53 /** enum i2c_address_mode - available address modes */
54 enum i2c_address_mode {
61 * struct dm_i2c_chip - information about an i2c chip
63 * An I2C chip is a device on the I2C bus. It sits at a particular address
64 * and normally supports 7-bit or 10-bit addressing.
66 * To obtain this structure, use dev_get_parent_platdata(dev) where dev is
67 * the chip to examine.
69 * @chip_addr: Chip address on bus
70 * @offset_len: Length of offset in bytes. A single byte offset can
71 * represent up to 256 bytes. A value larger than 1 may be
72 * needed for larger devices.
73 * @flags: Flags for this chip (dm_i2c_chip_flags)
74 * @chip_addr_offset_mask: Mask of offset bits within chip_addr. Used for
75 * devices which steal addresses as part of offset.
76 * If offset_len is zero, then the offset is encoded
77 * completely within the chip address itself.
78 * e.g. a devce with chip address of 0x2c with 512
79 * registers might use the bottom bit of the address
80 * to indicate which half of the address space is being
81 * accessed while still only using 1 byte offset.
82 * This means it will respond to chip address 0x2c and
84 * A real world example is the Atmel AT24C04. It's
85 * datasheet explains it's usage of this addressing
87 * @emul: Emulator for this chip address (only used for emulation)
93 uint chip_addr_offset_mask;
101 * struct dm_i2c_bus- information about an i2c bus
103 * An I2C bus contains 0 or more chips on it, each at its own address. The
104 * bus can operate at different speeds (measured in Hz, typically 100KHz
107 * To obtain this structure, use dev_get_uclass_priv(bus) where bus is the
110 * @speed_hz: Bus speed in hertz (typically 100000)
111 * @max_transaction_bytes: Maximal size of single I2C transfer
115 int max_transaction_bytes;
119 * Not all of these flags are implemented in the U-Boot API
121 enum dm_i2c_msg_flags {
122 I2C_M_TEN = 0x0010, /* ten-bit chip address */
123 I2C_M_RD = 0x0001, /* read data, from slave to master */
124 I2C_M_STOP = 0x8000, /* send stop after this message */
125 I2C_M_NOSTART = 0x4000, /* no start before this message */
126 I2C_M_REV_DIR_ADDR = 0x2000, /* invert polarity of R/W bit */
127 I2C_M_IGNORE_NAK = 0x1000, /* continue after NAK */
128 I2C_M_NO_RD_ACK = 0x0800, /* skip the Ack bit on reads */
129 I2C_M_RECV_LEN = 0x0400, /* length is first received byte */
133 * struct i2c_msg - an I2C message
135 * @addr: Slave address
136 * @flags: Flags (see enum dm_i2c_msg_flags)
137 * @len: Length of buffer in bytes, may be 0 for a probe
138 * @buf: Buffer to send/receive, or NULL if no data
148 * struct i2c_msg_list - a list of I2C messages
150 * This is called i2c_rdwr_ioctl_data in Linux but the name does not seem
151 * appropriate in U-Boot.
153 * @msg: Pointer to i2c_msg array
154 * @nmsgs: Number of elements in the array
156 struct i2c_msg_list {
157 struct i2c_msg *msgs;
162 * dm_i2c_read() - read bytes from an I2C chip
164 * To obtain an I2C device (called a 'chip') given the I2C bus address you
165 * can use i2c_get_chip(). To obtain a bus by bus number use
166 * uclass_get_device_by_seq(UCLASS_I2C, <bus number>).
168 * To set the address length of a devce use i2c_set_addr_len(). It
171 * @dev: Chip to read from
172 * @offset: Offset within chip to start reading
173 * @buffer: Place to put data
174 * @len: Number of bytes to read
176 * @return 0 on success, -ve on failure
178 int dm_i2c_read(struct udevice *dev, uint offset, uint8_t *buffer, int len);
181 * dm_i2c_write() - write bytes to an I2C chip
183 * See notes for dm_i2c_read() above.
185 * @dev: Chip to write to
186 * @offset: Offset within chip to start writing
187 * @buffer: Buffer containing data to write
188 * @len: Number of bytes to write
190 * @return 0 on success, -ve on failure
192 int dm_i2c_write(struct udevice *dev, uint offset, const uint8_t *buffer,
196 * dm_i2c_probe() - probe a particular chip address
198 * This can be useful to check for the existence of a chip on the bus.
199 * It is typically implemented by writing the chip address to the bus
200 * and checking that the chip replies with an ACK.
203 * @chip_addr: 7-bit address to probe (10-bit and others are not supported)
204 * @chip_flags: Flags for the probe (see enum dm_i2c_chip_flags)
205 * @devp: Returns the device found, or NULL if none
206 * @return 0 if a chip was found at that address, -ve if not
208 int dm_i2c_probe(struct udevice *bus, uint chip_addr, uint chip_flags,
209 struct udevice **devp);
212 * dm_i2c_reg_read() - Read a value from an I2C register
214 * This reads a single value from the given address in an I2C chip
216 * @dev: Device to use for transfer
217 * @addr: Address to read from
218 * @return value read, or -ve on error
220 int dm_i2c_reg_read(struct udevice *dev, uint offset);
223 * dm_i2c_reg_write() - Write a value to an I2C register
225 * This writes a single value to the given address in an I2C chip
227 * @dev: Device to use for transfer
228 * @addr: Address to write to
229 * @val: Value to write (normally a byte)
230 * @return 0 on success, -ve on error
232 int dm_i2c_reg_write(struct udevice *dev, uint offset, unsigned int val);
235 * dm_i2c_xfer() - Transfer messages over I2C
237 * This transfers a raw message. It is best to use dm_i2c_reg_read/write()
240 * @dev: Device to use for transfer
241 * @msg: List of messages to transfer
242 * @nmsgs: Number of messages to transfer
243 * @return 0 on success, -ve on error
245 int dm_i2c_xfer(struct udevice *dev, struct i2c_msg *msg, int nmsgs);
248 * dm_i2c_set_bus_speed() - set the speed of a bus
250 * @bus: Bus to adjust
251 * @speed: Requested speed in Hz
252 * @return 0 if OK, -EINVAL for invalid values
254 int dm_i2c_set_bus_speed(struct udevice *bus, unsigned int speed);
257 * dm_i2c_get_bus_speed() - get the speed of a bus
260 * @return speed of selected I2C bus in Hz, -ve on error
262 int dm_i2c_get_bus_speed(struct udevice *bus);
265 * i2c_set_chip_flags() - set flags for a chip
267 * Typically addresses are 7 bits, but for 10-bit addresses you should set
268 * flags to DM_I2C_CHIP_10BIT. All accesses will then use 10-bit addressing.
270 * @dev: Chip to adjust
272 * @return 0 if OK, -EINVAL if value is unsupported, other -ve value on error
274 int i2c_set_chip_flags(struct udevice *dev, uint flags);
277 * i2c_get_chip_flags() - get flags for a chip
279 * @dev: Chip to check
280 * @flagsp: Place to put flags
281 * @return 0 if OK, other -ve value on error
283 int i2c_get_chip_flags(struct udevice *dev, uint *flagsp);
286 * i2c_set_offset_len() - set the offset length for a chip
288 * The offset used to access a chip may be up to 4 bytes long. Typically it
289 * is only 1 byte, which is enough for chips with 256 bytes of memory or
290 * registers. The default value is 1, but you can call this function to
293 * @offset_len: New offset length value (typically 1 or 2)
295 int i2c_set_chip_offset_len(struct udevice *dev, uint offset_len);
298 * i2c_get_offset_len() - get the offset length for a chip
300 * @return: Current offset length value (typically 1 or 2)
302 int i2c_get_chip_offset_len(struct udevice *dev);
305 * i2c_set_chip_addr_offset_mask() - set mask of address bits usable by offset
307 * Some devices listen on multiple chip addresses to achieve larger offsets
308 * than their single or multiple byte offsets would allow for. You can use this
309 * function to set the bits that are valid to be used for offset overflow.
311 * @mask: The mask to be used for high offset bits within address
312 * @return 0 if OK, other -ve value on error
314 int i2c_set_chip_addr_offset_mask(struct udevice *dev, uint mask);
317 * i2c_get_chip_addr_offset_mask() - get mask of address bits usable by offset
319 * @return current chip addr offset mask
321 uint i2c_get_chip_addr_offset_mask(struct udevice *dev);
324 * i2c_deblock() - recover a bus that is in an unknown state
326 * See the deblock() method in 'struct dm_i2c_ops' for full information
328 * @bus: Bus to recover
329 * @return 0 if OK, -ve on error
331 int i2c_deblock(struct udevice *bus);
334 * struct dm_i2c_ops - driver operations for I2C uclass
336 * Drivers should support these operations unless otherwise noted. These
337 * operations are intended to be used by uclass code, not directly from
342 * xfer() - transfer a list of I2C messages
344 * @bus: Bus to read from
345 * @msg: List of messages to transfer
346 * @nmsgs: Number of messages in the list
347 * @return 0 if OK, -EREMOTEIO if the slave did not ACK a byte,
348 * -ECOMM if the speed cannot be supported, -EPROTO if the chip
349 * flags cannot be supported, other -ve value on some other error
351 int (*xfer)(struct udevice *bus, struct i2c_msg *msg, int nmsgs);
354 * probe_chip() - probe for the presense of a chip address
356 * This function is optional. If omitted, the uclass will send a zero
357 * length message instead.
360 * @chip_addr: Chip address to probe
361 * @chip_flags: Probe flags (enum dm_i2c_chip_flags)
362 * @return 0 if chip was found, -EREMOTEIO if not, -ENOSYS to fall back
363 * to default probem other -ve value on error
365 int (*probe_chip)(struct udevice *bus, uint chip_addr, uint chip_flags);
368 * set_bus_speed() - set the speed of a bus (optional)
370 * The bus speed value will be updated by the uclass if this function
371 * does not return an error. This method is optional - if it is not
372 * provided then the driver can read the speed from
373 * dev_get_uclass_priv(bus)->speed_hz
375 * @bus: Bus to adjust
376 * @speed: Requested speed in Hz
377 * @return 0 if OK, -EINVAL for invalid values
379 int (*set_bus_speed)(struct udevice *bus, unsigned int speed);
382 * get_bus_speed() - get the speed of a bus (optional)
384 * Normally this can be provided by the uclass, but if you want your
385 * driver to check the bus speed by looking at the hardware, you can
386 * implement that here. This method is optional. This method would
387 * normally be expected to return dev_get_uclass_priv(bus)->speed_hz.
390 * @return speed of selected I2C bus in Hz, -ve on error
392 int (*get_bus_speed)(struct udevice *bus);
395 * set_flags() - set the flags for a chip (optional)
397 * This is generally implemented by the uclass, but drivers can
398 * check the value to ensure that unsupported options are not used.
399 * This method is optional. If provided, this method will always be
400 * called when the flags change.
402 * @dev: Chip to adjust
403 * @flags: New flags value
404 * @return 0 if OK, -EINVAL if value is unsupported
406 int (*set_flags)(struct udevice *dev, uint flags);
409 * deblock() - recover a bus that is in an unknown state
411 * I2C is a synchronous protocol and resets of the processor in the
412 * middle of an access can block the I2C Bus until a powerdown of
413 * the full unit is done. This is because slaves can be stuck
414 * waiting for addition bus transitions for a transaction that will
415 * never complete. Resetting the I2C master does not help. The only
416 * way is to force the bus through a series of transitions to make
417 * sure that all slaves are done with the transaction. This method
418 * performs this 'deblocking' if support by the driver.
420 * This method is optional.
422 int (*deblock)(struct udevice *bus);
425 #define i2c_get_ops(dev) ((struct dm_i2c_ops *)(dev)->driver->ops)
428 * struct i2c_mux_ops - operations for an I2C mux
430 * The current mux state is expected to be stored in the mux itself since
431 * it is the only thing that knows how to make things work. The mux can
432 * record the current state and then avoid switching unless it is necessary.
433 * So select() can be skipped if the mux is already in the correct state.
434 * Also deselect() can be made a nop if required.
438 * select() - select one of of I2C buses attached to a mux
440 * This will be called when there is no bus currently selected by the
441 * mux. This method does not need to deselect the old bus since
442 * deselect() will be already have been called if necessary.
445 * @bus: I2C bus to select
446 * @channel: Channel number correponding to the bus to select
447 * @return 0 if OK, -ve on error
449 int (*select)(struct udevice *mux, struct udevice *bus, uint channel);
452 * deselect() - select one of of I2C buses attached to a mux
454 * This is used to deselect the currently selected I2C bus.
457 * @bus: I2C bus to deselect
458 * @channel: Channel number correponding to the bus to deselect
459 * @return 0 if OK, -ve on error
461 int (*deselect)(struct udevice *mux, struct udevice *bus, uint channel);
464 #define i2c_mux_get_ops(dev) ((struct i2c_mux_ops *)(dev)->driver->ops)
467 * i2c_get_chip() - get a device to use to access a chip on a bus
469 * This returns the device for the given chip address. The device can then
470 * be used with calls to i2c_read(), i2c_write(), i2c_probe(), etc.
472 * @bus: Bus to examine
473 * @chip_addr: Chip address for the new device
474 * @offset_len: Length of a register offset in bytes (normally 1)
475 * @devp: Returns pointer to new device if found or -ENODEV if not
478 int i2c_get_chip(struct udevice *bus, uint chip_addr, uint offset_len,
479 struct udevice **devp);
482 * i2c_get_chip_for_busnum() - get a device to use to access a chip on
485 * This returns the device for the given chip address on a particular bus
488 * @busnum: Bus number to examine
489 * @chip_addr: Chip address for the new device
490 * @offset_len: Length of a register offset in bytes (normally 1)
491 * @devp: Returns pointer to new device if found or -ENODEV if not
494 int i2c_get_chip_for_busnum(int busnum, int chip_addr, uint offset_len,
495 struct udevice **devp);
498 * i2c_chip_ofdata_to_platdata() - Decode standard I2C platform data
500 * This decodes the chip address from a device tree node and puts it into
501 * its dm_i2c_chip structure. This should be called in your driver's
502 * ofdata_to_platdata() method.
504 * @blob: Device tree blob
505 * @node: Node offset to read from
506 * @spi: Place to put the decoded information
508 int i2c_chip_ofdata_to_platdata(struct udevice *dev, struct dm_i2c_chip *chip);
511 * i2c_dump_msgs() - Dump a list of I2C messages
513 * This may be useful for debugging.
515 * @msg: Message list to dump
516 * @nmsgs: Number of messages
518 void i2c_dump_msgs(struct i2c_msg *msg, int nmsgs);
521 * i2c_emul_find() - Find an emulator for an i2c sandbox device
523 * This looks at the device's 'emul' phandle
525 * @dev: Device to find an emulator for
526 * @emulp: Returns the associated emulator, if found *
527 * @return 0 if OK, -ENOENT or -ENODEV if not found
529 int i2c_emul_find(struct udevice *dev, struct udevice **emulp);
532 * i2c_emul_get_device() - Find the device being emulated
534 * Given an emulator this returns the associated device
536 * @emul: Emulator for the device
537 * @return device that @emul is emulating
539 struct udevice *i2c_emul_get_device(struct udevice *emul);
541 #ifndef CONFIG_DM_I2C
544 * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
546 * The implementation MUST NOT use static or global variables if the
547 * I2C routines are used to read SDRAM configuration information
548 * because this is done before the memories are initialized. Limited
549 * use of stack-based variables are OK (the initial stack size is
552 * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
556 * Configuration items.
558 #define I2C_RXTX_LEN 128 /* maximum tx/rx buffer length */
560 #if !defined(CONFIG_SYS_I2C_MAX_HOPS)
561 /* no muxes used bus = i2c adapters */
562 #define CONFIG_SYS_I2C_DIRECT_BUS 1
563 #define CONFIG_SYS_I2C_MAX_HOPS 0
564 #define CONFIG_SYS_NUM_I2C_BUSES ll_entry_count(struct i2c_adapter, i2c)
566 /* we use i2c muxes */
567 #undef CONFIG_SYS_I2C_DIRECT_BUS
570 /* define the I2C bus number for RTC and DTT if not already done */
571 #if !defined(CONFIG_SYS_RTC_BUS_NUM)
572 #define CONFIG_SYS_RTC_BUS_NUM 0
574 #if !defined(CONFIG_SYS_SPD_BUS_NUM)
575 #define CONFIG_SYS_SPD_BUS_NUM 0
579 void (*init)(struct i2c_adapter *adap, int speed,
581 int (*probe)(struct i2c_adapter *adap, uint8_t chip);
582 int (*read)(struct i2c_adapter *adap, uint8_t chip,
583 uint addr, int alen, uint8_t *buffer,
585 int (*write)(struct i2c_adapter *adap, uint8_t chip,
586 uint addr, int alen, uint8_t *buffer,
588 uint (*set_bus_speed)(struct i2c_adapter *adap,
598 #define U_BOOT_I2C_MKENT_COMPLETE(_init, _probe, _read, _write, \
599 _set_speed, _speed, _slaveaddr, _hwadapnr, _name) \
605 .set_bus_speed = _set_speed, \
607 .slaveaddr = _slaveaddr, \
609 .hwadapnr = _hwadapnr, \
613 #define U_BOOT_I2C_ADAP_COMPLETE(_name, _init, _probe, _read, _write, \
614 _set_speed, _speed, _slaveaddr, _hwadapnr) \
615 ll_entry_declare(struct i2c_adapter, _name, i2c) = \
616 U_BOOT_I2C_MKENT_COMPLETE(_init, _probe, _read, _write, \
617 _set_speed, _speed, _slaveaddr, _hwadapnr, _name);
619 struct i2c_adapter *i2c_get_adapter(int index);
621 #ifndef CONFIG_SYS_I2C_DIRECT_BUS
627 struct i2c_next_hop {
633 struct i2c_bus_hose {
635 struct i2c_next_hop next_hop[CONFIG_SYS_I2C_MAX_HOPS];
637 #define I2C_NULL_HOP {{-1, ""}, 0, 0}
638 extern struct i2c_bus_hose i2c_bus[];
640 #define I2C_ADAPTER(bus) i2c_bus[bus].adapter
642 #define I2C_ADAPTER(bus) bus
644 #define I2C_BUS gd->cur_i2c_bus
646 #define I2C_ADAP_NR(bus) i2c_get_adapter(I2C_ADAPTER(bus))
647 #define I2C_ADAP I2C_ADAP_NR(gd->cur_i2c_bus)
648 #define I2C_ADAP_HWNR (I2C_ADAP->hwadapnr)
650 #ifndef CONFIG_SYS_I2C_DIRECT_BUS
651 #define I2C_MUX_PCA9540_ID 1
652 #define I2C_MUX_PCA9540 {I2C_MUX_PCA9540_ID, "PCA9540B"}
653 #define I2C_MUX_PCA9542_ID 2
654 #define I2C_MUX_PCA9542 {I2C_MUX_PCA9542_ID, "PCA9542A"}
655 #define I2C_MUX_PCA9544_ID 3
656 #define I2C_MUX_PCA9544 {I2C_MUX_PCA9544_ID, "PCA9544A"}
657 #define I2C_MUX_PCA9547_ID 4
658 #define I2C_MUX_PCA9547 {I2C_MUX_PCA9547_ID, "PCA9547A"}
659 #define I2C_MUX_PCA9548_ID 5
660 #define I2C_MUX_PCA9548 {I2C_MUX_PCA9548_ID, "PCA9548"}
663 #ifndef I2C_SOFT_DECLARATIONS
664 # if (defined(CONFIG_AT91RM9200) || \
665 defined(CONFIG_AT91SAM9260) || defined(CONFIG_AT91SAM9261) || \
666 defined(CONFIG_AT91SAM9263))
667 # define I2C_SOFT_DECLARATIONS at91_pio_t *pio = (at91_pio_t *) ATMEL_BASE_PIOA;
669 # define I2C_SOFT_DECLARATIONS
674 * Many boards/controllers/drivers don't support an I2C slave interface so
675 * provide a default slave address for them for use in common code. A real
676 * value for CONFIG_SYS_I2C_SLAVE should be defined for any board which does
677 * support a slave interface.
679 #ifndef CONFIG_SYS_I2C_SLAVE
680 #define CONFIG_SYS_I2C_SLAVE 0xfe
684 * Initialization, must be called once on start up, may be called
685 * repeatedly to change the speed and slave addresses.
687 #ifdef CONFIG_SYS_I2C_EARLY_INIT
688 void i2c_early_init_f(void);
690 void i2c_init(int speed, int slaveaddr);
691 void i2c_init_board(void);
693 #ifdef CONFIG_SYS_I2C
697 * Returns index of currently active I2C bus. Zero-based.
699 unsigned int i2c_get_bus_num(void);
704 * Change the active I2C bus. Subsequent read/write calls will
707 * bus - bus index, zero based
709 * Returns: 0 on success, not 0 on failure
712 int i2c_set_bus_num(unsigned int bus);
717 * Initializes all I2C adapters in the system. All i2c_adap structures must
718 * be initialized beforehead with function pointers and data, including
719 * speed and slaveaddr. Returns 0 on success, non-0 on failure.
721 void i2c_init_all(void);
724 * Probe the given I2C chip address. Returns 0 if a chip responded,
727 int i2c_probe(uint8_t chip);
730 * Read/Write interface:
731 * chip: I2C chip address, range 0..127
732 * addr: Memory (register) address within the chip
733 * alen: Number of bytes to use for addr (typically 1, 2 for larger
734 * memories, 0 for register type devices with only one
736 * buffer: Where to read/write the data
737 * len: How many bytes to read/write
739 * Returns: 0 on success, not 0 on failure
741 int i2c_read(uint8_t chip, unsigned int addr, int alen,
742 uint8_t *buffer, int len);
744 int i2c_write(uint8_t chip, unsigned int addr, int alen,
745 uint8_t *buffer, int len);
748 * Utility routines to read/write registers.
750 uint8_t i2c_reg_read(uint8_t addr, uint8_t reg);
752 void i2c_reg_write(uint8_t addr, uint8_t reg, uint8_t val);
757 * Change the speed of the active I2C bus
759 * speed - bus speed in Hz
761 * Returns: new bus speed
764 unsigned int i2c_set_bus_speed(unsigned int speed);
769 * Returns speed of currently active I2C bus in Hz
772 unsigned int i2c_get_bus_speed(void);
777 * Probe the given I2C chip address. Returns 0 if a chip responded,
780 int i2c_probe(uchar chip);
783 * Read/Write interface:
784 * chip: I2C chip address, range 0..127
785 * addr: Memory (register) address within the chip
786 * alen: Number of bytes to use for addr (typically 1, 2 for larger
787 * memories, 0 for register type devices with only one
789 * buffer: Where to read/write the data
790 * len: How many bytes to read/write
792 * Returns: 0 on success, not 0 on failure
794 int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len);
795 int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len);
798 * Utility routines to read/write registers.
800 static inline u8 i2c_reg_read(u8 addr, u8 reg)
805 printf("%s: addr=0x%02x, reg=0x%02x\n", __func__, addr, reg);
808 i2c_read(addr, reg, 1, &buf, 1);
813 static inline void i2c_reg_write(u8 addr, u8 reg, u8 val)
816 printf("%s: addr=0x%02x, reg=0x%02x, val=0x%02x\n",
817 __func__, addr, reg, val);
820 i2c_write(addr, reg, 1, &val, 1);
824 * Functions for setting the current I2C bus and its speed
830 * Change the active I2C bus. Subsequent read/write calls will
833 * bus - bus index, zero based
835 * Returns: 0 on success, not 0 on failure
838 int i2c_set_bus_num(unsigned int bus);
843 * Returns index of currently active I2C bus. Zero-based.
846 unsigned int i2c_get_bus_num(void);
851 * Change the speed of the active I2C bus
853 * speed - bus speed in Hz
855 * Returns: 0 on success, not 0 on failure
858 int i2c_set_bus_speed(unsigned int);
863 * Returns speed of currently active I2C bus in Hz
866 unsigned int i2c_get_bus_speed(void);
867 #endif /* CONFIG_SYS_I2C */
870 * only for backwardcompatibility, should go away if we switched
871 * completely to new multibus support.
873 #if defined(CONFIG_SYS_I2C) || defined(CONFIG_I2C_MULTI_BUS)
874 # if !defined(CONFIG_SYS_MAX_I2C_BUS)
875 # define CONFIG_SYS_MAX_I2C_BUS 2
877 # define I2C_MULTI_BUS 1
879 # define CONFIG_SYS_MAX_I2C_BUS 1
880 # define I2C_MULTI_BUS 0
883 /* NOTE: These two functions MUST be always_inline to avoid code growth! */
884 static inline unsigned int I2C_GET_BUS(void) __attribute__((always_inline));
885 static inline unsigned int I2C_GET_BUS(void)
887 return I2C_MULTI_BUS ? i2c_get_bus_num() : 0;
890 static inline void I2C_SET_BUS(unsigned int bus) __attribute__((always_inline));
891 static inline void I2C_SET_BUS(unsigned int bus)
894 i2c_set_bus_num(bus);
897 /* Multi I2C definitions */
899 I2C_0, I2C_1, I2C_2, I2C_3, I2C_4, I2C_5, I2C_6, I2C_7,
900 I2C_8, I2C_9, I2C_10,
904 * Get FDT values for i2c bus.
906 * @param blob Device tree blbo
907 * @return the number of I2C bus
909 void board_i2c_init(const void *blob);
912 * Find the I2C bus number by given a FDT I2C node.
914 * @param blob Device tree blbo
915 * @param node FDT I2C node to find
916 * @return the number of I2C bus (zero based), or -1 on error
918 int i2c_get_bus_num_fdt(int node);
921 * Reset the I2C bus represented by the given a FDT I2C node.
923 * @param blob Device tree blbo
924 * @param node FDT I2C node to find
925 * @return 0 if port was reset, -1 if not found
927 int i2c_reset_port_fdt(const void *blob, int node);
929 #endif /* !CONFIG_DM_I2C */