2 * Driver for the TWSI (i2c) controller found on the Marvell
3 * orion5x and kirkwood SoC families.
5 * Author: Albert Aribaud <albert.u.boot@aribaud.net>
6 * Copyright (c) 2010 Albert Aribaud.
8 * SPDX-License-Identifier: GPL-2.0+
13 #include <linux/errno.h>
15 #include <linux/compat.h>
20 DECLARE_GLOBAL_DATA_PTR
;
23 * Include a file that will provide CONFIG_I2C_MVTWSI_BASE*, and possibly other
28 #if defined(CONFIG_ORION5X)
29 #include <asm/arch/orion5x.h>
30 #elif (defined(CONFIG_KIRKWOOD) || defined(CONFIG_ARCH_MVEBU))
31 #include <asm/arch/soc.h>
32 #elif defined(CONFIG_ARCH_SUNXI)
33 #include <asm/arch/i2c.h>
35 #error Driver mvtwsi not supported by SoC or board
37 #endif /* CONFIG_DM_I2C */
40 * On SUNXI, we get CONFIG_SYS_TCLK from this include, so we want to
43 #if defined(CONFIG_DM_I2C) && defined(CONFIG_ARCH_SUNXI)
44 #include <asm/arch/i2c.h>
48 * TWSI register structure
51 #ifdef CONFIG_ARCH_SUNXI
53 struct mvtwsi_registers
{
65 struct mvtwsi_registers
{
70 u32 status
; /* When reading */
71 u32 baudrate
; /* When writing */
81 struct mvtwsi_i2c_dev
{
82 /* TWSI Register base for the device */
83 struct mvtwsi_registers
*base
;
84 /* Number of the device (determined from cell-index property) */
86 /* The I2C slave address for the device */
88 /* The configured I2C speed in Hz */
90 /* The current length of a clock period (depending on speed) */
93 #endif /* CONFIG_DM_I2C */
96 * enum mvtwsi_ctrl_register_fields - Bit masks for flags in the control
99 enum mvtwsi_ctrl_register_fields
{
100 /* Acknowledge bit */
101 MVTWSI_CONTROL_ACK
= 0x00000004,
103 MVTWSI_CONTROL_IFLG
= 0x00000008,
105 MVTWSI_CONTROL_STOP
= 0x00000010,
107 MVTWSI_CONTROL_START
= 0x00000020,
109 MVTWSI_CONTROL_TWSIEN
= 0x00000040,
110 /* Interrupt enable */
111 MVTWSI_CONTROL_INTEN
= 0x00000080,
115 * On sun6i and newer, IFLG is a write-clear bit, which is cleared by writing 1;
116 * on other platforms, it is a normal r/w bit, which is cleared by writing 0.
119 #ifdef CONFIG_SUNXI_GEN_SUN6I
120 #define MVTWSI_CONTROL_CLEAR_IFLG 0x00000008
122 #define MVTWSI_CONTROL_CLEAR_IFLG 0x00000000
126 * enum mvstwsi_status_values - Possible values of I2C controller's status
129 * Only those statuses expected in normal master operation on
130 * non-10-bit-address devices are specified.
132 * Every status that's unexpected during normal operation (bus errors,
133 * arbitration losses, missing ACKs...) is passed back to the caller as an error
136 enum mvstwsi_status_values
{
137 /* START condition transmitted */
138 MVTWSI_STATUS_START
= 0x08,
139 /* Repeated START condition transmitted */
140 MVTWSI_STATUS_REPEATED_START
= 0x10,
141 /* Address + write bit transmitted, ACK received */
142 MVTWSI_STATUS_ADDR_W_ACK
= 0x18,
143 /* Data transmitted, ACK received */
144 MVTWSI_STATUS_DATA_W_ACK
= 0x28,
145 /* Address + read bit transmitted, ACK received */
146 MVTWSI_STATUS_ADDR_R_ACK
= 0x40,
147 /* Address + read bit transmitted, ACK not received */
148 MVTWSI_STATUS_ADDR_R_NAK
= 0x48,
149 /* Data received, ACK transmitted */
150 MVTWSI_STATUS_DATA_R_ACK
= 0x50,
151 /* Data received, ACK not transmitted */
152 MVTWSI_STATUS_DATA_R_NAK
= 0x58,
153 /* No relevant status */
154 MVTWSI_STATUS_IDLE
= 0xF8,
158 * enum mvstwsi_ack_flags - Determine whether a read byte should be
159 * acknowledged or not.
161 enum mvtwsi_ack_flags
{
162 /* Send NAK after received byte */
164 /* Send ACK after received byte */
169 * calc_tick() - Calculate the duration of a clock cycle from the I2C speed
171 * @speed: The speed in Hz to calculate the clock cycle duration for.
172 * @return The duration of a clock cycle in ns.
174 inline uint
calc_tick(uint speed
)
176 /* One tick = the duration of a period at the specified speed in ns (we
177 * add 100 ns to be on the safe side) */
178 return (1000000000u / speed
) + 100;
181 #ifndef CONFIG_DM_I2C
184 * twsi_get_base() - Get controller register base for specified adapter
186 * @adap: Adapter to get the register base for.
187 * @return Register base for the specified adapter.
189 static struct mvtwsi_registers
*twsi_get_base(struct i2c_adapter
*adap
)
191 switch (adap
->hwadapnr
) {
192 #ifdef CONFIG_I2C_MVTWSI_BASE0
194 return (struct mvtwsi_registers
*)CONFIG_I2C_MVTWSI_BASE0
;
196 #ifdef CONFIG_I2C_MVTWSI_BASE1
198 return (struct mvtwsi_registers
*)CONFIG_I2C_MVTWSI_BASE1
;
200 #ifdef CONFIG_I2C_MVTWSI_BASE2
202 return (struct mvtwsi_registers
*)CONFIG_I2C_MVTWSI_BASE2
;
204 #ifdef CONFIG_I2C_MVTWSI_BASE3
206 return (struct mvtwsi_registers
*)CONFIG_I2C_MVTWSI_BASE3
;
208 #ifdef CONFIG_I2C_MVTWSI_BASE4
210 return (struct mvtwsi_registers
*)CONFIG_I2C_MVTWSI_BASE4
;
212 #ifdef CONFIG_I2C_MVTWSI_BASE5
214 return (struct mvtwsi_registers
*)CONFIG_I2C_MVTWSI_BASE5
;
217 printf("Missing mvtwsi controller %d base\n", adap
->hwadapnr
);
226 * enum mvtwsi_error_class - types of I2C errors
228 enum mvtwsi_error_class
{
229 /* The controller returned a different status than expected */
230 MVTWSI_ERROR_WRONG_STATUS
= 0x01,
231 /* The controller timed out */
232 MVTWSI_ERROR_TIMEOUT
= 0x02,
236 * mvtwsi_error() - Build I2C return code from error information
238 * For debugging purposes, this function packs some information of an occurred
239 * error into a return code. These error codes are returned from I2C API
240 * functions (i2c_{read,write}, dm_i2c_{read,write}, etc.).
242 * @ec: The error class of the error (enum mvtwsi_error_class).
243 * @lc: The last value of the control register.
244 * @ls: The last value of the status register.
245 * @es: The expected value of the status register.
246 * @return The generated error code.
248 inline uint
mvtwsi_error(uint ec
, uint lc
, uint ls
, uint es
)
250 return ((ec
<< 24) & 0xFF000000)
251 | ((lc
<< 16) & 0x00FF0000)
252 | ((ls
<< 8) & 0x0000FF00)
257 * twsi_wait() - Wait for I2C bus interrupt flag and check status, or time out.
259 * @return Zero if status is as expected, or a non-zero code if either a time
260 * out occurred, or the status was not the expected one.
262 static int twsi_wait(struct mvtwsi_registers
*twsi
, int expected_status
,
269 control
= readl(&twsi
->control
);
270 if (control
& MVTWSI_CONTROL_IFLG
) {
271 status
= readl(&twsi
->status
);
272 if (status
== expected_status
)
276 MVTWSI_ERROR_WRONG_STATUS
,
277 control
, status
, expected_status
);
279 ndelay(tick
); /* One clock cycle */
281 status
= readl(&twsi
->status
);
282 return mvtwsi_error(MVTWSI_ERROR_TIMEOUT
, control
, status
,
287 * twsi_start() - Assert a START condition on the bus.
289 * This function is used in both single I2C transactions and inside
290 * back-to-back transactions (repeated starts).
292 * @twsi: The MVTWSI register structure to use.
293 * @expected_status: The I2C bus status expected to be asserted after the
294 * operation completion.
295 * @tick: The duration of a clock cycle at the current I2C speed.
296 * @return Zero if status is as expected, or a non-zero code if either a time
297 * out occurred or the status was not the expected one.
299 static int twsi_start(struct mvtwsi_registers
*twsi
, int expected_status
,
303 writel(MVTWSI_CONTROL_TWSIEN
| MVTWSI_CONTROL_START
|
304 MVTWSI_CONTROL_CLEAR_IFLG
, &twsi
->control
);
305 /* Wait for controller to process START */
306 return twsi_wait(twsi
, expected_status
, tick
);
310 * twsi_send() - Send a byte on the I2C bus.
312 * The byte may be part of an address byte or data.
314 * @twsi: The MVTWSI register structure to use.
315 * @byte: The byte to send.
316 * @expected_status: The I2C bus status expected to be asserted after the
317 * operation completion.
318 * @tick: The duration of a clock cycle at the current I2C speed.
319 * @return Zero if status is as expected, or a non-zero code if either a time
320 * out occurred or the status was not the expected one.
322 static int twsi_send(struct mvtwsi_registers
*twsi
, u8 byte
,
323 int expected_status
, uint tick
)
325 /* Write byte to data register for sending */
326 writel(byte
, &twsi
->data
);
327 /* Clear any pending interrupt -- that will cause sending */
328 writel(MVTWSI_CONTROL_TWSIEN
| MVTWSI_CONTROL_CLEAR_IFLG
,
330 /* Wait for controller to receive byte, and check ACK */
331 return twsi_wait(twsi
, expected_status
, tick
);
335 * twsi_recv() - Receive a byte on the I2C bus.
337 * The static variable mvtwsi_control_flags controls whether we ack or nak.
339 * @twsi: The MVTWSI register structure to use.
340 * @byte: The byte to send.
341 * @ack_flag: Flag that determines whether the received byte should
342 * be acknowledged by the controller or not (sent ACK/NAK).
343 * @tick: The duration of a clock cycle at the current I2C speed.
344 * @return Zero if status is as expected, or a non-zero code if either a time
345 * out occurred or the status was not the expected one.
347 static int twsi_recv(struct mvtwsi_registers
*twsi
, u8
*byte
, int ack_flag
,
350 int expected_status
, status
, control
;
352 /* Compute expected status based on passed ACK flag */
353 expected_status
= ack_flag
? MVTWSI_STATUS_DATA_R_ACK
:
354 MVTWSI_STATUS_DATA_R_NAK
;
355 /* Acknowledge *previous state*, and launch receive */
356 control
= MVTWSI_CONTROL_TWSIEN
;
357 control
|= ack_flag
== MVTWSI_READ_ACK
? MVTWSI_CONTROL_ACK
: 0;
358 writel(control
| MVTWSI_CONTROL_CLEAR_IFLG
, &twsi
->control
);
359 /* Wait for controller to receive byte, and assert ACK or NAK */
360 status
= twsi_wait(twsi
, expected_status
, tick
);
361 /* If we did receive the expected byte, store it */
363 *byte
= readl(&twsi
->data
);
368 * twsi_stop() - Assert a STOP condition on the bus.
370 * This function is also used to force the bus back to idle state (SDA =
373 * @twsi: The MVTWSI register structure to use.
374 * @tick: The duration of a clock cycle at the current I2C speed.
375 * @return Zero if the operation succeeded, or a non-zero code if a time out
378 static int twsi_stop(struct mvtwsi_registers
*twsi
, uint tick
)
380 int control
, stop_status
;
385 control
= MVTWSI_CONTROL_TWSIEN
| MVTWSI_CONTROL_STOP
;
386 writel(control
| MVTWSI_CONTROL_CLEAR_IFLG
, &twsi
->control
);
387 /* Wait for IDLE; IFLG won't rise, so we can't use twsi_wait() */
389 stop_status
= readl(&twsi
->status
);
390 if (stop_status
== MVTWSI_STATUS_IDLE
)
392 ndelay(tick
); /* One clock cycle */
394 control
= readl(&twsi
->control
);
395 if (stop_status
!= MVTWSI_STATUS_IDLE
)
396 status
= mvtwsi_error(MVTWSI_ERROR_TIMEOUT
,
397 control
, status
, MVTWSI_STATUS_IDLE
);
402 * twsi_calc_freq() - Compute I2C frequency depending on m and n parameters.
404 * @n: Parameter 'n' for the frequency calculation algorithm.
405 * @m: Parameter 'm' for the frequency calculation algorithm.
406 * @return The I2C frequency corresponding to the passed m and n parameters.
408 static uint
twsi_calc_freq(const int n
, const int m
)
410 #ifdef CONFIG_ARCH_SUNXI
411 return CONFIG_SYS_TCLK
/ (10 * (m
+ 1) * (1 << n
));
413 return CONFIG_SYS_TCLK
/ (10 * (m
+ 1) * (2 << n
));
418 * twsi_reset() - Reset the I2C controller.
420 * Resetting the controller also resets the baud rate and slave address, hence
421 * they must be re-established after the reset.
423 * @twsi: The MVTWSI register structure to use.
425 static void twsi_reset(struct mvtwsi_registers
*twsi
)
427 /* Reset controller */
428 writel(0, &twsi
->soft_reset
);
429 /* Wait 2 ms -- this is what the Marvell LSP does */
434 * __twsi_i2c_set_bus_speed() - Set the speed of the I2C controller.
436 * This function sets baud rate to the highest possible value that does not
437 * exceed the requested rate.
439 * @twsi: The MVTWSI register structure to use.
440 * @requested_speed: The desired frequency the controller should run at
442 * @return The actual frequency the controller was configured to.
444 static uint
__twsi_i2c_set_bus_speed(struct mvtwsi_registers
*twsi
,
445 uint requested_speed
)
447 uint tmp_speed
, highest_speed
, n
, m
;
448 uint baud
= 0x44; /* Baud rate after controller reset */
451 /* Successively try m, n combinations, and use the combination
452 * resulting in the largest speed that's not above the requested
454 for (n
= 0; n
< 8; n
++) {
455 for (m
= 0; m
< 16; m
++) {
456 tmp_speed
= twsi_calc_freq(n
, m
);
457 if ((tmp_speed
<= requested_speed
) &&
458 (tmp_speed
> highest_speed
)) {
459 highest_speed
= tmp_speed
;
464 writel(baud
, &twsi
->baudrate
);
466 /* Wait for controller for one tick */
468 ndelay(calc_tick(highest_speed
));
472 return highest_speed
;
476 * __twsi_i2c_init() - Initialize the I2C controller.
478 * @twsi: The MVTWSI register structure to use.
479 * @speed: The initial frequency the controller should run at
481 * @slaveadd: The I2C address to be set for the I2C master.
482 * @actual_speed: A output parameter that receives the actual frequency
483 * in Hz the controller was set to by the function.
484 * @return Zero if the operation succeeded, or a non-zero code if a time out
487 static void __twsi_i2c_init(struct mvtwsi_registers
*twsi
, int speed
,
488 int slaveadd
, uint
*actual_speed
)
490 /* Reset controller */
493 *actual_speed
= __twsi_i2c_set_bus_speed(twsi
, speed
);
494 /* Set slave address; even though we don't use it */
495 writel(slaveadd
, &twsi
->slave_address
);
496 writel(0, &twsi
->xtnd_slave_addr
);
497 /* Assert STOP, but don't care for the result */
499 (void) twsi_stop(twsi
, calc_tick(*actual_speed
));
501 (void) twsi_stop(twsi
, 10000);
506 * i2c_begin() - Start a I2C transaction.
508 * Begin a I2C transaction with a given expected start status and chip address.
509 * A START is asserted, and the address byte is sent to the I2C controller. The
510 * expected address status will be derived from the direction bit (bit 0) of
513 * @twsi: The MVTWSI register structure to use.
514 * @expected_start_status: The I2C status the controller is expected to
515 * assert after the address byte was sent.
516 * @addr: The address byte to be sent.
517 * @tick: The duration of a clock cycle at the current
519 * @return Zero if the operation succeeded, or a non-zero code if a time out or
520 * unexpected I2C status occurred.
522 static int i2c_begin(struct mvtwsi_registers
*twsi
, int expected_start_status
,
525 int status
, expected_addr_status
;
527 /* Compute the expected address status from the direction bit in
528 * the address byte */
529 if (addr
& 1) /* Reading */
530 expected_addr_status
= MVTWSI_STATUS_ADDR_R_ACK
;
532 expected_addr_status
= MVTWSI_STATUS_ADDR_W_ACK
;
534 status
= twsi_start(twsi
, expected_start_status
, tick
);
535 /* Send out the address if the start went well */
537 status
= twsi_send(twsi
, addr
, expected_addr_status
, tick
);
538 /* Return 0, or the status of the first failure */
543 * __twsi_i2c_probe_chip() - Probe the given I2C chip address.
545 * This function begins a I2C read transaction, does a dummy read and NAKs; if
546 * the procedure succeeds, the chip is considered to be present.
548 * @twsi: The MVTWSI register structure to use.
549 * @chip: The chip address to probe.
550 * @tick: The duration of a clock cycle at the current I2C speed.
551 * @return Zero if the operation succeeded, or a non-zero code if a time out or
552 * unexpected I2C status occurred.
554 static int __twsi_i2c_probe_chip(struct mvtwsi_registers
*twsi
, uchar chip
,
561 status
= i2c_begin(twsi
, MVTWSI_STATUS_START
, (chip
<< 1) | 1, tick
);
562 /* Dummy read was accepted: receive byte, but NAK it. */
564 status
= twsi_recv(twsi
, &dummy_byte
, MVTWSI_READ_NAK
, tick
);
565 /* Stop transaction */
566 twsi_stop(twsi
, tick
);
567 /* Return 0, or the status of the first failure */
572 * __twsi_i2c_read() - Read data from a I2C chip.
574 * This function begins a I2C write transaction, and transmits the address
575 * bytes; then begins a I2C read transaction, and receives the data bytes.
577 * NOTE: Some devices want a stop right before the second start, while some
578 * will choke if it is there. Since deciding this is not yet supported in
579 * higher level APIs, we need to make a decision here, and for the moment that
580 * will be a repeated start without a preceding stop.
582 * @twsi: The MVTWSI register structure to use.
583 * @chip: The chip address to read from.
584 * @addr: The address bytes to send.
585 * @alen: The length of the address bytes in bytes.
586 * @data: The buffer to receive the data read from the chip (has to have
587 * a size of at least 'length' bytes).
588 * @length: The amount of data to be read from the chip in bytes.
589 * @tick: The duration of a clock cycle at the current I2C speed.
590 * @return Zero if the operation succeeded, or a non-zero code if a time out or
591 * unexpected I2C status occurred.
593 static int __twsi_i2c_read(struct mvtwsi_registers
*twsi
, uchar chip
,
594 u8
*addr
, int alen
, uchar
*data
, int length
,
599 int expected_start
= MVTWSI_STATUS_START
;
602 /* Begin i2c write to send the address bytes */
603 status
= i2c_begin(twsi
, expected_start
, (chip
<< 1), tick
);
604 /* Send address bytes */
605 while ((status
== 0) && alen
--)
606 status
= twsi_send(twsi
, addr
[alen
],
607 MVTWSI_STATUS_DATA_W_ACK
, tick
);
608 /* Send repeated STARTs after the initial START */
609 expected_start
= MVTWSI_STATUS_REPEATED_START
;
611 /* Begin i2c read to receive data bytes */
613 status
= i2c_begin(twsi
, expected_start
, (chip
<< 1) | 1, tick
);
614 /* Receive actual data bytes; set NAK if we if we have nothing more to
616 while ((status
== 0) && length
--)
617 status
= twsi_recv(twsi
, data
++,
619 MVTWSI_READ_ACK
: MVTWSI_READ_NAK
, tick
);
620 /* Stop transaction */
621 stop_status
= twsi_stop(twsi
, tick
);
622 /* Return 0, or the status of the first failure */
623 return status
!= 0 ? status
: stop_status
;
627 * __twsi_i2c_write() - Send data to a I2C chip.
629 * This function begins a I2C write transaction, and transmits the address
630 * bytes; then begins a new I2C write transaction, and sends the data bytes.
632 * @twsi: The MVTWSI register structure to use.
633 * @chip: The chip address to read from.
634 * @addr: The address bytes to send.
635 * @alen: The length of the address bytes in bytes.
636 * @data: The buffer containing the data to be sent to the chip.
637 * @length: The length of data to be sent to the chip in bytes.
638 * @tick: The duration of a clock cycle at the current I2C speed.
639 * @return Zero if the operation succeeded, or a non-zero code if a time out or
640 * unexpected I2C status occurred.
642 static int __twsi_i2c_write(struct mvtwsi_registers
*twsi
, uchar chip
,
643 u8
*addr
, int alen
, uchar
*data
, int length
,
646 int status
, stop_status
;
648 /* Begin i2c write to send first the address bytes, then the
650 status
= i2c_begin(twsi
, MVTWSI_STATUS_START
, (chip
<< 1), tick
);
651 /* Send address bytes */
652 while ((status
== 0) && (alen
-- > 0))
653 status
= twsi_send(twsi
, addr
[alen
], MVTWSI_STATUS_DATA_W_ACK
,
655 /* Send data bytes */
656 while ((status
== 0) && (length
-- > 0))
657 status
= twsi_send(twsi
, *(data
++), MVTWSI_STATUS_DATA_W_ACK
,
659 /* Stop transaction */
660 stop_status
= twsi_stop(twsi
, tick
);
661 /* Return 0, or the status of the first failure */
662 return status
!= 0 ? status
: stop_status
;
665 #ifndef CONFIG_DM_I2C
666 static void twsi_i2c_init(struct i2c_adapter
*adap
, int speed
,
669 struct mvtwsi_registers
*twsi
= twsi_get_base(adap
);
670 __twsi_i2c_init(twsi
, speed
, slaveadd
, NULL
);
673 static uint
twsi_i2c_set_bus_speed(struct i2c_adapter
*adap
,
674 uint requested_speed
)
676 struct mvtwsi_registers
*twsi
= twsi_get_base(adap
);
677 __twsi_i2c_set_bus_speed(twsi
, requested_speed
);
681 static int twsi_i2c_probe(struct i2c_adapter
*adap
, uchar chip
)
683 struct mvtwsi_registers
*twsi
= twsi_get_base(adap
);
684 return __twsi_i2c_probe_chip(twsi
, chip
, 10000);
687 static int twsi_i2c_read(struct i2c_adapter
*adap
, uchar chip
, uint addr
,
688 int alen
, uchar
*data
, int length
)
690 struct mvtwsi_registers
*twsi
= twsi_get_base(adap
);
693 addr_bytes
[0] = (addr
>> 0) & 0xFF;
694 addr_bytes
[1] = (addr
>> 8) & 0xFF;
695 addr_bytes
[2] = (addr
>> 16) & 0xFF;
696 addr_bytes
[3] = (addr
>> 24) & 0xFF;
698 return __twsi_i2c_read(twsi
, chip
, addr_bytes
, alen
, data
, length
,
702 static int twsi_i2c_write(struct i2c_adapter
*adap
, uchar chip
, uint addr
,
703 int alen
, uchar
*data
, int length
)
705 struct mvtwsi_registers
*twsi
= twsi_get_base(adap
);
708 addr_bytes
[0] = (addr
>> 0) & 0xFF;
709 addr_bytes
[1] = (addr
>> 8) & 0xFF;
710 addr_bytes
[2] = (addr
>> 16) & 0xFF;
711 addr_bytes
[3] = (addr
>> 24) & 0xFF;
713 return __twsi_i2c_write(twsi
, chip
, addr_bytes
, alen
, data
, length
,
717 #ifdef CONFIG_I2C_MVTWSI_BASE0
718 U_BOOT_I2C_ADAP_COMPLETE(twsi0
, twsi_i2c_init
, twsi_i2c_probe
,
719 twsi_i2c_read
, twsi_i2c_write
,
720 twsi_i2c_set_bus_speed
,
721 CONFIG_SYS_I2C_SPEED
, CONFIG_SYS_I2C_SLAVE
, 0)
723 #ifdef CONFIG_I2C_MVTWSI_BASE1
724 U_BOOT_I2C_ADAP_COMPLETE(twsi1
, twsi_i2c_init
, twsi_i2c_probe
,
725 twsi_i2c_read
, twsi_i2c_write
,
726 twsi_i2c_set_bus_speed
,
727 CONFIG_SYS_I2C_SPEED
, CONFIG_SYS_I2C_SLAVE
, 1)
730 #ifdef CONFIG_I2C_MVTWSI_BASE2
731 U_BOOT_I2C_ADAP_COMPLETE(twsi2
, twsi_i2c_init
, twsi_i2c_probe
,
732 twsi_i2c_read
, twsi_i2c_write
,
733 twsi_i2c_set_bus_speed
,
734 CONFIG_SYS_I2C_SPEED
, CONFIG_SYS_I2C_SLAVE
, 2)
737 #ifdef CONFIG_I2C_MVTWSI_BASE3
738 U_BOOT_I2C_ADAP_COMPLETE(twsi3
, twsi_i2c_init
, twsi_i2c_probe
,
739 twsi_i2c_read
, twsi_i2c_write
,
740 twsi_i2c_set_bus_speed
,
741 CONFIG_SYS_I2C_SPEED
, CONFIG_SYS_I2C_SLAVE
, 3)
744 #ifdef CONFIG_I2C_MVTWSI_BASE4
745 U_BOOT_I2C_ADAP_COMPLETE(twsi4
, twsi_i2c_init
, twsi_i2c_probe
,
746 twsi_i2c_read
, twsi_i2c_write
,
747 twsi_i2c_set_bus_speed
,
748 CONFIG_SYS_I2C_SPEED
, CONFIG_SYS_I2C_SLAVE
, 4)
751 #ifdef CONFIG_I2C_MVTWSI_BASE5
752 U_BOOT_I2C_ADAP_COMPLETE(twsi5
, twsi_i2c_init
, twsi_i2c_probe
,
753 twsi_i2c_read
, twsi_i2c_write
,
754 twsi_i2c_set_bus_speed
,
755 CONFIG_SYS_I2C_SPEED
, CONFIG_SYS_I2C_SLAVE
, 5)
758 #else /* CONFIG_DM_I2C */
760 static int mvtwsi_i2c_probe_chip(struct udevice
*bus
, u32 chip_addr
,
763 struct mvtwsi_i2c_dev
*dev
= dev_get_priv(bus
);
764 return __twsi_i2c_probe_chip(dev
->base
, chip_addr
, dev
->tick
);
767 static int mvtwsi_i2c_set_bus_speed(struct udevice
*bus
, uint speed
)
769 struct mvtwsi_i2c_dev
*dev
= dev_get_priv(bus
);
771 dev
->speed
= __twsi_i2c_set_bus_speed(dev
->base
, speed
);
772 dev
->tick
= calc_tick(dev
->speed
);
777 static int mvtwsi_i2c_ofdata_to_platdata(struct udevice
*bus
)
779 struct mvtwsi_i2c_dev
*dev
= dev_get_priv(bus
);
781 dev
->base
= devfdt_get_addr_ptr(bus
);
786 dev
->index
= fdtdec_get_int(gd
->fdt_blob
, dev_of_offset(bus
),
788 dev
->slaveadd
= fdtdec_get_int(gd
->fdt_blob
, dev_of_offset(bus
),
789 "u-boot,i2c-slave-addr", 0x0);
790 dev
->speed
= fdtdec_get_int(gd
->fdt_blob
, dev_of_offset(bus
),
791 "clock-frequency", 100000);
795 static int mvtwsi_i2c_probe(struct udevice
*bus
)
797 struct mvtwsi_i2c_dev
*dev
= dev_get_priv(bus
);
800 __twsi_i2c_init(dev
->base
, dev
->speed
, dev
->slaveadd
, &actual_speed
);
801 dev
->speed
= actual_speed
;
802 dev
->tick
= calc_tick(dev
->speed
);
806 static int mvtwsi_i2c_xfer(struct udevice
*bus
, struct i2c_msg
*msg
, int nmsgs
)
808 struct mvtwsi_i2c_dev
*dev
= dev_get_priv(bus
);
809 struct i2c_msg
*dmsg
, *omsg
, dummy
;
811 memset(&dummy
, 0, sizeof(struct i2c_msg
));
813 /* We expect either two messages (one with an offset and one with the
814 * actual data) or one message (just data or offset/data combined) */
815 if (nmsgs
> 2 || nmsgs
== 0) {
816 debug("%s: Only one or two messages are supported.", __func__
);
820 omsg
= nmsgs
== 1 ? &dummy
: msg
;
821 dmsg
= nmsgs
== 1 ? msg
: msg
+ 1;
823 if (dmsg
->flags
& I2C_M_RD
)
824 return __twsi_i2c_read(dev
->base
, dmsg
->addr
, omsg
->buf
,
825 omsg
->len
, dmsg
->buf
, dmsg
->len
,
828 return __twsi_i2c_write(dev
->base
, dmsg
->addr
, omsg
->buf
,
829 omsg
->len
, dmsg
->buf
, dmsg
->len
,
833 static const struct dm_i2c_ops mvtwsi_i2c_ops
= {
834 .xfer
= mvtwsi_i2c_xfer
,
835 .probe_chip
= mvtwsi_i2c_probe_chip
,
836 .set_bus_speed
= mvtwsi_i2c_set_bus_speed
,
839 static const struct udevice_id mvtwsi_i2c_ids
[] = {
840 { .compatible
= "marvell,mv64xxx-i2c", },
841 { .compatible
= "marvell,mv78230-i2c", },
842 { .compatible
= "allwinner,sun6i-a31-i2c", },
846 U_BOOT_DRIVER(i2c_mvtwsi
) = {
847 .name
= "i2c_mvtwsi",
849 .of_match
= mvtwsi_i2c_ids
,
850 .probe
= mvtwsi_i2c_probe
,
851 .ofdata_to_platdata
= mvtwsi_i2c_ofdata_to_platdata
,
852 .priv_auto_alloc_size
= sizeof(struct mvtwsi_i2c_dev
),
853 .ops
= &mvtwsi_i2c_ops
,
855 #endif /* CONFIG_DM_I2C */