2 * Chromium OS cros_ec driver
4 * Copyright (c) 2012 The Chromium OS Authors.
6 * SPDX-License-Identifier: GPL-2.0+
10 * This is the interface to the Chrome OS EC. It provides keyboard functions,
11 * power control and battery management. Quite a few other functions are
12 * provided to enable the EC software to be updated, talk to the EC's I2C bus
13 * and store a small amount of data in a memory which persists while the EC
25 #include <linux/errno.h>
27 #include <asm-generic/gpio.h>
28 #include <dm/device-internal.h>
29 #include <dm/uclass-internal.h>
32 #define debug_trace(fmt, b...) debug(fmt, #b)
34 #define debug_trace(fmt, b...)
38 /* Timeout waiting for a flash erase command to complete */
39 CROS_EC_CMD_TIMEOUT_MS
= 5000,
40 /* Timeout waiting for a synchronous hash to be recomputed */
41 CROS_EC_CMD_HASH_TIMEOUT_MS
= 2000,
44 DECLARE_GLOBAL_DATA_PTR
;
46 /* Note: depends on enum ec_current_image */
47 static const char * const ec_current_image_name
[] = {"unknown", "RO", "RW"};
49 void cros_ec_dump_data(const char *name
, int cmd
, const uint8_t *data
, int len
)
56 printf("cmd=%#x: ", cmd
);
57 for (i
= 0; i
< len
; i
++)
58 printf("%02x ", data
[i
]);
64 * Calculate a simple 8-bit checksum of a data block
66 * @param data Data block to checksum
67 * @param size Size of data block in bytes
68 * @return checksum value (0 to 255)
70 int cros_ec_calc_checksum(const uint8_t *data
, int size
)
74 for (i
= csum
= 0; i
< size
; i
++)
80 * Create a request packet for protocol version 3.
82 * The packet is stored in the device's internal output buffer.
84 * @param dev CROS-EC device
85 * @param cmd Command to send (EC_CMD_...)
86 * @param cmd_version Version of command to send (EC_VER_...)
87 * @param dout Output data (may be NULL If dout_len=0)
88 * @param dout_len Size of output data in bytes
89 * @return packet size in bytes, or <0 if error.
91 static int create_proto3_request(struct cros_ec_dev
*dev
,
92 int cmd
, int cmd_version
,
93 const void *dout
, int dout_len
)
95 struct ec_host_request
*rq
= (struct ec_host_request
*)dev
->dout
;
96 int out_bytes
= dout_len
+ sizeof(*rq
);
98 /* Fail if output size is too big */
99 if (out_bytes
> (int)sizeof(dev
->dout
)) {
100 debug("%s: Cannot send %d bytes\n", __func__
, dout_len
);
101 return -EC_RES_REQUEST_TRUNCATED
;
104 /* Fill in request packet */
105 rq
->struct_version
= EC_HOST_REQUEST_VERSION
;
108 rq
->command_version
= cmd_version
;
110 rq
->data_len
= dout_len
;
112 /* Copy data after header */
113 memcpy(rq
+ 1, dout
, dout_len
);
115 /* Write checksum field so the entire packet sums to 0 */
116 rq
->checksum
= (uint8_t)(-cros_ec_calc_checksum(dev
->dout
, out_bytes
));
118 cros_ec_dump_data("out", cmd
, dev
->dout
, out_bytes
);
120 /* Return size of request packet */
125 * Prepare the device to receive a protocol version 3 response.
127 * @param dev CROS-EC device
128 * @param din_len Maximum size of response in bytes
129 * @return maximum expected number of bytes in response, or <0 if error.
131 static int prepare_proto3_response_buffer(struct cros_ec_dev
*dev
, int din_len
)
133 int in_bytes
= din_len
+ sizeof(struct ec_host_response
);
135 /* Fail if input size is too big */
136 if (in_bytes
> (int)sizeof(dev
->din
)) {
137 debug("%s: Cannot receive %d bytes\n", __func__
, din_len
);
138 return -EC_RES_RESPONSE_TOO_BIG
;
141 /* Return expected size of response packet */
146 * Handle a protocol version 3 response packet.
148 * The packet must already be stored in the device's internal input buffer.
150 * @param dev CROS-EC device
151 * @param dinp Returns pointer to response data
152 * @param din_len Maximum size of response in bytes
153 * @return number of bytes of response data, or <0 if error. Note that error
154 * codes can be from errno.h or -ve EC_RES_INVALID_CHECKSUM values (and they
157 static int handle_proto3_response(struct cros_ec_dev
*dev
,
158 uint8_t **dinp
, int din_len
)
160 struct ec_host_response
*rs
= (struct ec_host_response
*)dev
->din
;
164 cros_ec_dump_data("in-header", -1, dev
->din
, sizeof(*rs
));
166 /* Check input data */
167 if (rs
->struct_version
!= EC_HOST_RESPONSE_VERSION
) {
168 debug("%s: EC response version mismatch\n", __func__
);
169 return -EC_RES_INVALID_RESPONSE
;
173 debug("%s: EC response reserved != 0\n", __func__
);
174 return -EC_RES_INVALID_RESPONSE
;
177 if (rs
->data_len
> din_len
) {
178 debug("%s: EC returned too much data\n", __func__
);
179 return -EC_RES_RESPONSE_TOO_BIG
;
182 cros_ec_dump_data("in-data", -1, dev
->din
+ sizeof(*rs
), rs
->data_len
);
184 /* Update in_bytes to actual data size */
185 in_bytes
= sizeof(*rs
) + rs
->data_len
;
187 /* Verify checksum */
188 csum
= cros_ec_calc_checksum(dev
->din
, in_bytes
);
190 debug("%s: EC response checksum invalid: 0x%02x\n", __func__
,
192 return -EC_RES_INVALID_CHECKSUM
;
195 /* Return error result, if any */
197 return -(int)rs
->result
;
199 /* If we're still here, set response data pointer and return length */
200 *dinp
= (uint8_t *)(rs
+ 1);
205 static int send_command_proto3(struct cros_ec_dev
*dev
,
206 int cmd
, int cmd_version
,
207 const void *dout
, int dout_len
,
208 uint8_t **dinp
, int din_len
)
210 struct dm_cros_ec_ops
*ops
;
211 int out_bytes
, in_bytes
;
214 /* Create request packet */
215 out_bytes
= create_proto3_request(dev
, cmd
, cmd_version
,
220 /* Prepare response buffer */
221 in_bytes
= prepare_proto3_response_buffer(dev
, din_len
);
225 ops
= dm_cros_ec_get_ops(dev
->dev
);
226 rv
= ops
->packet
? ops
->packet(dev
->dev
, out_bytes
, in_bytes
) : -ENOSYS
;
230 /* Process the response */
231 return handle_proto3_response(dev
, dinp
, din_len
);
234 static int send_command(struct cros_ec_dev
*dev
, uint8_t cmd
, int cmd_version
,
235 const void *dout
, int dout_len
,
236 uint8_t **dinp
, int din_len
)
238 struct dm_cros_ec_ops
*ops
;
241 /* Handle protocol version 3 support */
242 if (dev
->protocol_version
== 3) {
243 return send_command_proto3(dev
, cmd
, cmd_version
,
244 dout
, dout_len
, dinp
, din_len
);
247 ops
= dm_cros_ec_get_ops(dev
->dev
);
248 ret
= ops
->command(dev
->dev
, cmd
, cmd_version
,
249 (const uint8_t *)dout
, dout_len
, dinp
, din_len
);
255 * Send a command to the CROS-EC device and return the reply.
257 * The device's internal input/output buffers are used.
259 * @param dev CROS-EC device
260 * @param cmd Command to send (EC_CMD_...)
261 * @param cmd_version Version of command to send (EC_VER_...)
262 * @param dout Output data (may be NULL If dout_len=0)
263 * @param dout_len Size of output data in bytes
264 * @param dinp Response data (may be NULL If din_len=0).
265 * If not NULL, it will be updated to point to the data
266 * and will always be double word aligned (64-bits)
267 * @param din_len Maximum size of response in bytes
268 * @return number of bytes in response, or -ve on error
270 static int ec_command_inptr(struct cros_ec_dev
*dev
, uint8_t cmd
,
271 int cmd_version
, const void *dout
, int dout_len
, uint8_t **dinp
,
277 len
= send_command(dev
, cmd
, cmd_version
, dout
, dout_len
,
280 /* If the command doesn't complete, wait a while */
281 if (len
== -EC_RES_IN_PROGRESS
) {
282 struct ec_response_get_comms_status
*resp
= NULL
;
285 /* Wait for command to complete */
286 start
= get_timer(0);
290 mdelay(50); /* Insert some reasonable delay */
291 ret
= send_command(dev
, EC_CMD_GET_COMMS_STATUS
, 0,
293 (uint8_t **)&resp
, sizeof(*resp
));
297 if (get_timer(start
) > CROS_EC_CMD_TIMEOUT_MS
) {
298 debug("%s: Command %#02x timeout\n",
300 return -EC_RES_TIMEOUT
;
302 } while (resp
->flags
& EC_COMMS_STATUS_PROCESSING
);
304 /* OK it completed, so read the status response */
305 /* not sure why it was 0 for the last argument */
306 len
= send_command(dev
, EC_CMD_RESEND_RESPONSE
, 0,
307 NULL
, 0, &din
, din_len
);
310 debug("%s: len=%d, dinp=%p, *dinp=%p\n", __func__
, len
, dinp
,
311 dinp
? *dinp
: NULL
);
313 /* If we have any data to return, it must be 64bit-aligned */
314 assert(len
<= 0 || !((uintptr_t)din
& 7));
322 * Send a command to the CROS-EC device and return the reply.
324 * The device's internal input/output buffers are used.
326 * @param dev CROS-EC device
327 * @param cmd Command to send (EC_CMD_...)
328 * @param cmd_version Version of command to send (EC_VER_...)
329 * @param dout Output data (may be NULL If dout_len=0)
330 * @param dout_len Size of output data in bytes
331 * @param din Response data (may be NULL If din_len=0).
332 * It not NULL, it is a place for ec_command() to copy the
334 * @param din_len Maximum size of response in bytes
335 * @return number of bytes in response, or -ve on error
337 static int ec_command(struct cros_ec_dev
*dev
, uint8_t cmd
, int cmd_version
,
338 const void *dout
, int dout_len
,
339 void *din
, int din_len
)
344 assert((din_len
== 0) || din
);
345 len
= ec_command_inptr(dev
, cmd
, cmd_version
, dout
, dout_len
,
346 &in_buffer
, din_len
);
349 * If we were asked to put it somewhere, do so, otherwise just
350 * disregard the result.
352 if (din
&& in_buffer
) {
353 assert(len
<= din_len
);
354 memmove(din
, in_buffer
, len
);
360 int cros_ec_scan_keyboard(struct udevice
*dev
, struct mbkp_keyscan
*scan
)
362 struct cros_ec_dev
*cdev
= dev_get_uclass_priv(dev
);
364 if (ec_command(cdev
, EC_CMD_MKBP_STATE
, 0, NULL
, 0, scan
,
365 sizeof(scan
->data
)) != sizeof(scan
->data
))
371 int cros_ec_read_id(struct cros_ec_dev
*dev
, char *id
, int maxlen
)
373 struct ec_response_get_version
*r
;
375 if (ec_command_inptr(dev
, EC_CMD_GET_VERSION
, 0, NULL
, 0,
376 (uint8_t **)&r
, sizeof(*r
)) != sizeof(*r
))
379 if (maxlen
> (int)sizeof(r
->version_string_ro
))
380 maxlen
= sizeof(r
->version_string_ro
);
382 switch (r
->current_image
) {
384 memcpy(id
, r
->version_string_ro
, maxlen
);
387 memcpy(id
, r
->version_string_rw
, maxlen
);
393 id
[maxlen
- 1] = '\0';
397 int cros_ec_read_version(struct cros_ec_dev
*dev
,
398 struct ec_response_get_version
**versionp
)
400 if (ec_command_inptr(dev
, EC_CMD_GET_VERSION
, 0, NULL
, 0,
401 (uint8_t **)versionp
, sizeof(**versionp
))
402 != sizeof(**versionp
))
408 int cros_ec_read_build_info(struct cros_ec_dev
*dev
, char **strp
)
410 if (ec_command_inptr(dev
, EC_CMD_GET_BUILD_INFO
, 0, NULL
, 0,
411 (uint8_t **)strp
, EC_PROTO2_MAX_PARAM_SIZE
) < 0)
417 int cros_ec_read_current_image(struct cros_ec_dev
*dev
,
418 enum ec_current_image
*image
)
420 struct ec_response_get_version
*r
;
422 if (ec_command_inptr(dev
, EC_CMD_GET_VERSION
, 0, NULL
, 0,
423 (uint8_t **)&r
, sizeof(*r
)) != sizeof(*r
))
426 *image
= r
->current_image
;
430 static int cros_ec_wait_on_hash_done(struct cros_ec_dev
*dev
,
431 struct ec_response_vboot_hash
*hash
)
433 struct ec_params_vboot_hash p
;
436 start
= get_timer(0);
437 while (hash
->status
== EC_VBOOT_HASH_STATUS_BUSY
) {
438 mdelay(50); /* Insert some reasonable delay */
440 p
.cmd
= EC_VBOOT_HASH_GET
;
441 if (ec_command(dev
, EC_CMD_VBOOT_HASH
, 0, &p
, sizeof(p
),
442 hash
, sizeof(*hash
)) < 0)
445 if (get_timer(start
) > CROS_EC_CMD_HASH_TIMEOUT_MS
) {
446 debug("%s: EC_VBOOT_HASH_GET timeout\n", __func__
);
447 return -EC_RES_TIMEOUT
;
454 int cros_ec_read_hash(struct cros_ec_dev
*dev
,
455 struct ec_response_vboot_hash
*hash
)
457 struct ec_params_vboot_hash p
;
460 p
.cmd
= EC_VBOOT_HASH_GET
;
461 if (ec_command(dev
, EC_CMD_VBOOT_HASH
, 0, &p
, sizeof(p
),
462 hash
, sizeof(*hash
)) < 0)
465 /* If the EC is busy calculating the hash, fidget until it's done. */
466 rv
= cros_ec_wait_on_hash_done(dev
, hash
);
470 /* If the hash is valid, we're done. Otherwise, we have to kick it off
471 * again and wait for it to complete. Note that we explicitly assume
472 * that hashing zero bytes is always wrong, even though that would
473 * produce a valid hash value. */
474 if (hash
->status
== EC_VBOOT_HASH_STATUS_DONE
&& hash
->size
)
477 debug("%s: No valid hash (status=%d size=%d). Compute one...\n",
478 __func__
, hash
->status
, hash
->size
);
480 p
.cmd
= EC_VBOOT_HASH_START
;
481 p
.hash_type
= EC_VBOOT_HASH_TYPE_SHA256
;
483 p
.offset
= EC_VBOOT_HASH_OFFSET_RW
;
485 if (ec_command(dev
, EC_CMD_VBOOT_HASH
, 0, &p
, sizeof(p
),
486 hash
, sizeof(*hash
)) < 0)
489 rv
= cros_ec_wait_on_hash_done(dev
, hash
);
493 debug("%s: hash done\n", __func__
);
498 static int cros_ec_invalidate_hash(struct cros_ec_dev
*dev
)
500 struct ec_params_vboot_hash p
;
501 struct ec_response_vboot_hash
*hash
;
503 /* We don't have an explict command for the EC to discard its current
504 * hash value, so we'll just tell it to calculate one that we know is
505 * wrong (we claim that hashing zero bytes is always invalid).
507 p
.cmd
= EC_VBOOT_HASH_RECALC
;
508 p
.hash_type
= EC_VBOOT_HASH_TYPE_SHA256
;
513 debug("%s:\n", __func__
);
515 if (ec_command_inptr(dev
, EC_CMD_VBOOT_HASH
, 0, &p
, sizeof(p
),
516 (uint8_t **)&hash
, sizeof(*hash
)) < 0)
519 /* No need to wait for it to finish */
523 int cros_ec_reboot(struct cros_ec_dev
*dev
, enum ec_reboot_cmd cmd
,
526 struct ec_params_reboot_ec p
;
531 if (ec_command_inptr(dev
, EC_CMD_REBOOT_EC
, 0, &p
, sizeof(p
), NULL
, 0)
535 if (!(flags
& EC_REBOOT_FLAG_ON_AP_SHUTDOWN
)) {
537 * EC reboot will take place immediately so delay to allow it
538 * to complete. Note that some reboot types (EC_REBOOT_COLD)
539 * will reboot the AP as well, in which case we won't actually
543 * TODO(rspangler@chromium.org): Would be nice if we had a
544 * better way to determine when the reboot is complete. Could
545 * we poll a memory-mapped LPC value?
553 int cros_ec_interrupt_pending(struct udevice
*dev
)
555 struct cros_ec_dev
*cdev
= dev_get_uclass_priv(dev
);
557 /* no interrupt support : always poll */
558 if (!dm_gpio_is_valid(&cdev
->ec_int
))
561 return dm_gpio_get_value(&cdev
->ec_int
);
564 int cros_ec_info(struct cros_ec_dev
*dev
, struct ec_response_mkbp_info
*info
)
566 if (ec_command(dev
, EC_CMD_MKBP_INFO
, 0, NULL
, 0, info
,
567 sizeof(*info
)) != sizeof(*info
))
573 int cros_ec_get_host_events(struct cros_ec_dev
*dev
, uint32_t *events_ptr
)
575 struct ec_response_host_event_mask
*resp
;
578 * Use the B copy of the event flags, because the main copy is already
581 if (ec_command_inptr(dev
, EC_CMD_HOST_EVENT_GET_B
, 0, NULL
, 0,
582 (uint8_t **)&resp
, sizeof(*resp
)) < (int)sizeof(*resp
))
585 if (resp
->mask
& EC_HOST_EVENT_MASK(EC_HOST_EVENT_INVALID
))
588 *events_ptr
= resp
->mask
;
592 int cros_ec_clear_host_events(struct cros_ec_dev
*dev
, uint32_t events
)
594 struct ec_params_host_event_mask params
;
596 params
.mask
= events
;
599 * Use the B copy of the event flags, so it affects the data returned
600 * by cros_ec_get_host_events().
602 if (ec_command_inptr(dev
, EC_CMD_HOST_EVENT_CLEAR_B
, 0,
603 ¶ms
, sizeof(params
), NULL
, 0) < 0)
609 int cros_ec_flash_protect(struct cros_ec_dev
*dev
,
610 uint32_t set_mask
, uint32_t set_flags
,
611 struct ec_response_flash_protect
*resp
)
613 struct ec_params_flash_protect params
;
615 params
.mask
= set_mask
;
616 params
.flags
= set_flags
;
618 if (ec_command(dev
, EC_CMD_FLASH_PROTECT
, EC_VER_FLASH_PROTECT
,
619 ¶ms
, sizeof(params
),
620 resp
, sizeof(*resp
)) != sizeof(*resp
))
626 static int cros_ec_check_version(struct cros_ec_dev
*dev
)
628 struct ec_params_hello req
;
629 struct ec_response_hello
*resp
;
631 struct dm_cros_ec_ops
*ops
;
634 ops
= dm_cros_ec_get_ops(dev
->dev
);
635 if (ops
->check_version
) {
636 ret
= ops
->check_version(dev
->dev
);
642 * TODO(sjg@chromium.org).
643 * There is a strange oddity here with the EC. We could just ignore
644 * the response, i.e. pass the last two parameters as NULL and 0.
645 * In this case we won't read back very many bytes from the EC.
646 * On the I2C bus the EC gets upset about this and will try to send
647 * the bytes anyway. This means that we will have to wait for that
648 * to complete before continuing with a new EC command.
650 * This problem is probably unique to the I2C bus.
652 * So for now, just read all the data anyway.
655 /* Try sending a version 3 packet */
656 dev
->protocol_version
= 3;
658 if (ec_command_inptr(dev
, EC_CMD_HELLO
, 0, &req
, sizeof(req
),
659 (uint8_t **)&resp
, sizeof(*resp
)) > 0) {
663 /* Try sending a version 2 packet */
664 dev
->protocol_version
= 2;
665 if (ec_command_inptr(dev
, EC_CMD_HELLO
, 0, &req
, sizeof(req
),
666 (uint8_t **)&resp
, sizeof(*resp
)) > 0) {
671 * Fail if we're still here, since the EC doesn't understand any
672 * protcol version we speak. Version 1 interface without command
673 * version is no longer supported, and we don't know about any new
676 dev
->protocol_version
= 0;
677 printf("%s: ERROR: old EC interface not supported\n", __func__
);
681 int cros_ec_test(struct cros_ec_dev
*dev
)
683 struct ec_params_hello req
;
684 struct ec_response_hello
*resp
;
686 req
.in_data
= 0x12345678;
687 if (ec_command_inptr(dev
, EC_CMD_HELLO
, 0, &req
, sizeof(req
),
688 (uint8_t **)&resp
, sizeof(*resp
)) < sizeof(*resp
)) {
689 printf("ec_command_inptr() returned error\n");
692 if (resp
->out_data
!= req
.in_data
+ 0x01020304) {
693 printf("Received invalid handshake %x\n", resp
->out_data
);
700 int cros_ec_flash_offset(struct cros_ec_dev
*dev
, enum ec_flash_region region
,
701 uint32_t *offset
, uint32_t *size
)
703 struct ec_params_flash_region_info p
;
704 struct ec_response_flash_region_info
*r
;
708 ret
= ec_command_inptr(dev
, EC_CMD_FLASH_REGION_INFO
,
709 EC_VER_FLASH_REGION_INFO
,
710 &p
, sizeof(p
), (uint8_t **)&r
, sizeof(*r
));
711 if (ret
!= sizeof(*r
))
722 int cros_ec_flash_erase(struct cros_ec_dev
*dev
, uint32_t offset
, uint32_t size
)
724 struct ec_params_flash_erase p
;
728 return ec_command_inptr(dev
, EC_CMD_FLASH_ERASE
, 0, &p
, sizeof(p
),
733 * Write a single block to the flash
735 * Write a block of data to the EC flash. The size must not exceed the flash
736 * write block size which you can obtain from cros_ec_flash_write_burst_size().
738 * The offset starts at 0. You can obtain the region information from
739 * cros_ec_flash_offset() to find out where to write for a particular region.
741 * Attempting to write to the region where the EC is currently running from
742 * will result in an error.
744 * @param dev CROS-EC device
745 * @param data Pointer to data buffer to write
746 * @param offset Offset within flash to write to.
747 * @param size Number of bytes to write
748 * @return 0 if ok, -1 on error
750 static int cros_ec_flash_write_block(struct cros_ec_dev
*dev
,
751 const uint8_t *data
, uint32_t offset
, uint32_t size
)
753 struct ec_params_flash_write p
;
757 assert(data
&& p
.size
<= EC_FLASH_WRITE_VER0_SIZE
);
758 memcpy(&p
+ 1, data
, p
.size
);
760 return ec_command_inptr(dev
, EC_CMD_FLASH_WRITE
, 0,
761 &p
, sizeof(p
), NULL
, 0) >= 0 ? 0 : -1;
765 * Return optimal flash write burst size
767 static int cros_ec_flash_write_burst_size(struct cros_ec_dev
*dev
)
769 return EC_FLASH_WRITE_VER0_SIZE
;
773 * Check if a block of data is erased (all 0xff)
775 * This function is useful when dealing with flash, for checking whether a
776 * data block is erased and thus does not need to be programmed.
778 * @param data Pointer to data to check (must be word-aligned)
779 * @param size Number of bytes to check (must be word-aligned)
780 * @return 0 if erased, non-zero if any word is not erased
782 static int cros_ec_data_is_erased(const uint32_t *data
, int size
)
785 size
/= sizeof(uint32_t);
786 for (; size
> 0; size
-= 4, data
++)
793 int cros_ec_flash_write(struct cros_ec_dev
*dev
, const uint8_t *data
,
794 uint32_t offset
, uint32_t size
)
796 uint32_t burst
= cros_ec_flash_write_burst_size(dev
);
801 * TODO: round up to the nearest multiple of write size. Can get away
802 * without that on link right now because its write size is 4 bytes.
805 for (off
= offset
; off
< end
; off
+= burst
, data
+= burst
) {
808 /* If the data is empty, there is no point in programming it */
809 todo
= min(end
- off
, burst
);
810 if (dev
->optimise_flash_write
&&
811 cros_ec_data_is_erased((uint32_t *)data
, todo
))
814 ret
= cros_ec_flash_write_block(dev
, data
, off
, todo
);
823 * Read a single block from the flash
825 * Read a block of data from the EC flash. The size must not exceed the flash
826 * write block size which you can obtain from cros_ec_flash_write_burst_size().
828 * The offset starts at 0. You can obtain the region information from
829 * cros_ec_flash_offset() to find out where to read for a particular region.
831 * @param dev CROS-EC device
832 * @param data Pointer to data buffer to read into
833 * @param offset Offset within flash to read from
834 * @param size Number of bytes to read
835 * @return 0 if ok, -1 on error
837 static int cros_ec_flash_read_block(struct cros_ec_dev
*dev
, uint8_t *data
,
838 uint32_t offset
, uint32_t size
)
840 struct ec_params_flash_read p
;
845 return ec_command(dev
, EC_CMD_FLASH_READ
, 0,
846 &p
, sizeof(p
), data
, size
) >= 0 ? 0 : -1;
849 int cros_ec_flash_read(struct cros_ec_dev
*dev
, uint8_t *data
, uint32_t offset
,
852 uint32_t burst
= cros_ec_flash_write_burst_size(dev
);
857 for (off
= offset
; off
< end
; off
+= burst
, data
+= burst
) {
858 ret
= cros_ec_flash_read_block(dev
, data
, off
,
859 min(end
- off
, burst
));
867 int cros_ec_flash_update_rw(struct cros_ec_dev
*dev
,
868 const uint8_t *image
, int image_size
)
870 uint32_t rw_offset
, rw_size
;
873 if (cros_ec_flash_offset(dev
, EC_FLASH_REGION_RW
, &rw_offset
, &rw_size
))
875 if (image_size
> (int)rw_size
)
878 /* Invalidate the existing hash, just in case the AP reboots
879 * unexpectedly during the update. If that happened, the EC RW firmware
880 * would be invalid, but the EC would still have the original hash.
882 ret
= cros_ec_invalidate_hash(dev
);
887 * Erase the entire RW section, so that the EC doesn't see any garbage
888 * past the new image if it's smaller than the current image.
890 * TODO: could optimize this to erase just the current image, since
891 * presumably everything past that is 0xff's. But would still need to
892 * round up to the nearest multiple of erase size.
894 ret
= cros_ec_flash_erase(dev
, rw_offset
, rw_size
);
898 /* Write the image */
899 ret
= cros_ec_flash_write(dev
, image
, rw_offset
, image_size
);
906 int cros_ec_read_vbnvcontext(struct cros_ec_dev
*dev
, uint8_t *block
)
908 struct ec_params_vbnvcontext p
;
911 p
.op
= EC_VBNV_CONTEXT_OP_READ
;
913 len
= ec_command(dev
, EC_CMD_VBNV_CONTEXT
, EC_VER_VBNV_CONTEXT
,
914 &p
, sizeof(p
), block
, EC_VBNV_BLOCK_SIZE
);
915 if (len
< EC_VBNV_BLOCK_SIZE
)
921 int cros_ec_write_vbnvcontext(struct cros_ec_dev
*dev
, const uint8_t *block
)
923 struct ec_params_vbnvcontext p
;
926 p
.op
= EC_VBNV_CONTEXT_OP_WRITE
;
927 memcpy(p
.block
, block
, sizeof(p
.block
));
929 len
= ec_command_inptr(dev
, EC_CMD_VBNV_CONTEXT
, EC_VER_VBNV_CONTEXT
,
930 &p
, sizeof(p
), NULL
, 0);
937 int cros_ec_set_ldo(struct udevice
*dev
, uint8_t index
, uint8_t state
)
939 struct cros_ec_dev
*cdev
= dev_get_uclass_priv(dev
);
940 struct ec_params_ldo_set params
;
942 params
.index
= index
;
943 params
.state
= state
;
945 if (ec_command_inptr(cdev
, EC_CMD_LDO_SET
, 0, ¶ms
, sizeof(params
),
952 int cros_ec_get_ldo(struct udevice
*dev
, uint8_t index
, uint8_t *state
)
954 struct cros_ec_dev
*cdev
= dev_get_uclass_priv(dev
);
955 struct ec_params_ldo_get params
;
956 struct ec_response_ldo_get
*resp
;
958 params
.index
= index
;
960 if (ec_command_inptr(cdev
, EC_CMD_LDO_GET
, 0, ¶ms
, sizeof(params
),
961 (uint8_t **)&resp
, sizeof(*resp
)) !=
965 *state
= resp
->state
;
970 int cros_ec_register(struct udevice
*dev
)
972 struct cros_ec_dev
*cdev
= dev_get_uclass_priv(dev
);
973 const void *blob
= gd
->fdt_blob
;
974 int node
= dev
->of_offset
;
978 gpio_request_by_name(dev
, "ec-interrupt", 0, &cdev
->ec_int
,
980 cdev
->optimise_flash_write
= fdtdec_get_bool(blob
, node
,
981 "optimise-flash-write");
983 if (cros_ec_check_version(cdev
)) {
984 debug("%s: Could not detect CROS-EC version\n", __func__
);
985 return -CROS_EC_ERR_CHECK_VERSION
;
988 if (cros_ec_read_id(cdev
, id
, sizeof(id
))) {
989 debug("%s: Could not read KBC ID\n", __func__
);
990 return -CROS_EC_ERR_READ_ID
;
993 /* Remember this device for use by the cros_ec command */
994 debug("Google Chrome EC v%d CROS-EC driver ready, id '%s'\n",
995 cdev
->protocol_version
, id
);
1000 int cros_ec_decode_region(int argc
, char * const argv
[])
1003 if (0 == strcmp(*argv
, "rw"))
1004 return EC_FLASH_REGION_RW
;
1005 else if (0 == strcmp(*argv
, "ro"))
1006 return EC_FLASH_REGION_RO
;
1008 debug("%s: Invalid region '%s'\n", __func__
, *argv
);
1010 debug("%s: Missing region parameter\n", __func__
);
1016 int cros_ec_decode_ec_flash(const void *blob
, int node
,
1017 struct fdt_cros_ec
*config
)
1021 flash_node
= fdt_subnode_offset(blob
, node
, "flash");
1022 if (flash_node
< 0) {
1023 debug("Failed to find flash node\n");
1027 if (fdtdec_read_fmap_entry(blob
, flash_node
, "flash",
1029 debug("Failed to decode flash node in chrome-ec'\n");
1033 config
->flash_erase_value
= fdtdec_get_int(blob
, flash_node
,
1035 for (node
= fdt_first_subnode(blob
, flash_node
); node
>= 0;
1036 node
= fdt_next_subnode(blob
, node
)) {
1037 const char *name
= fdt_get_name(blob
, node
, NULL
);
1038 enum ec_flash_region region
;
1040 if (0 == strcmp(name
, "ro")) {
1041 region
= EC_FLASH_REGION_RO
;
1042 } else if (0 == strcmp(name
, "rw")) {
1043 region
= EC_FLASH_REGION_RW
;
1044 } else if (0 == strcmp(name
, "wp-ro")) {
1045 region
= EC_FLASH_REGION_WP_RO
;
1047 debug("Unknown EC flash region name '%s'\n", name
);
1051 if (fdtdec_read_fmap_entry(blob
, node
, "reg",
1052 &config
->region
[region
])) {
1053 debug("Failed to decode flash region in chrome-ec'\n");
1061 int cros_ec_i2c_tunnel(struct udevice
*dev
, int port
, struct i2c_msg
*in
,
1064 struct cros_ec_dev
*cdev
= dev_get_uclass_priv(dev
);
1066 struct ec_params_i2c_passthru p
;
1067 uint8_t outbuf
[EC_PROTO2_MAX_PARAM_SIZE
];
1070 struct ec_response_i2c_passthru r
;
1071 uint8_t inbuf
[EC_PROTO2_MAX_PARAM_SIZE
];
1073 struct ec_params_i2c_passthru
*p
= ¶ms
.p
;
1074 struct ec_response_i2c_passthru
*r
= &response
.r
;
1075 struct ec_params_i2c_passthru_msg
*msg
;
1076 uint8_t *pdata
, *read_ptr
= NULL
;
1084 p
->num_msgs
= nmsgs
;
1085 size
= sizeof(*p
) + p
->num_msgs
* sizeof(*msg
);
1087 /* Create a message to write the register address and optional data */
1088 pdata
= (uint8_t *)p
+ size
;
1091 for (i
= 0, msg
= p
->msg
; i
< nmsgs
; i
++, msg
++, in
++) {
1092 bool is_read
= in
->flags
& I2C_M_RD
;
1094 msg
->addr_flags
= in
->addr
;
1097 msg
->addr_flags
|= EC_I2C_FLAG_READ
;
1098 read_len
+= in
->len
;
1100 if (sizeof(*r
) + read_len
> sizeof(response
)) {
1101 puts("Read length too big for buffer\n");
1105 if (pdata
- (uint8_t *)p
+ in
->len
> sizeof(params
)) {
1106 puts("Params too large for buffer\n");
1109 memcpy(pdata
, in
->buf
, in
->len
);
1114 rv
= ec_command(cdev
, EC_CMD_I2C_PASSTHRU
, 0, p
, pdata
- (uint8_t *)p
,
1115 r
, sizeof(*r
) + read_len
);
1119 /* Parse response */
1120 if (r
->i2c_status
& EC_I2C_STATUS_ERROR
) {
1121 printf("Transfer failed with status=0x%x\n", r
->i2c_status
);
1125 if (rv
< sizeof(*r
) + read_len
) {
1126 puts("Truncated read response\n");
1130 /* We only support a single read message for each transfer */
1132 memcpy(read_ptr
, r
->data
, read_len
);
1137 #ifdef CONFIG_CMD_CROS_EC
1140 * Perform a flash read or write command
1142 * @param dev CROS-EC device to read/write
1143 * @param is_write 1 do to a write, 0 to do a read
1144 * @param argc Number of arguments
1145 * @param argv Arguments (2 is region, 3 is address)
1146 * @return 0 for ok, 1 for a usage error or -ve for ec command error
1147 * (negative EC_RES_...)
1149 static int do_read_write(struct cros_ec_dev
*dev
, int is_write
, int argc
,
1150 char * const argv
[])
1152 uint32_t offset
, size
= -1U, region_size
;
1158 region
= cros_ec_decode_region(argc
- 2, argv
+ 2);
1163 addr
= simple_strtoul(argv
[3], &endp
, 16);
1164 if (*argv
[3] == 0 || *endp
!= 0)
1167 size
= simple_strtoul(argv
[4], &endp
, 16);
1168 if (*argv
[4] == 0 || *endp
!= 0)
1172 ret
= cros_ec_flash_offset(dev
, region
, &offset
, ®ion_size
);
1174 debug("%s: Could not read region info\n", __func__
);
1181 cros_ec_flash_write(dev
, (uint8_t *)addr
, offset
, size
) :
1182 cros_ec_flash_read(dev
, (uint8_t *)addr
, offset
, size
);
1184 debug("%s: Could not %s region\n", __func__
,
1185 is_write
? "write" : "read");
1192 static int do_cros_ec(cmd_tbl_t
*cmdtp
, int flag
, int argc
, char * const argv
[])
1194 struct cros_ec_dev
*dev
;
1195 struct udevice
*udev
;
1200 return CMD_RET_USAGE
;
1203 if (0 == strcmp("init", cmd
)) {
1204 /* Remove any existing device */
1205 ret
= uclass_find_device(UCLASS_CROS_EC
, 0, &udev
);
1207 device_remove(udev
);
1208 ret
= uclass_get_device(UCLASS_CROS_EC
, 0, &udev
);
1210 printf("Could not init cros_ec device (err %d)\n", ret
);
1216 ret
= uclass_get_device(UCLASS_CROS_EC
, 0, &udev
);
1218 printf("Cannot get cros-ec device (err=%d)\n", ret
);
1221 dev
= dev_get_uclass_priv(udev
);
1222 if (0 == strcmp("id", cmd
)) {
1225 if (cros_ec_read_id(dev
, id
, sizeof(id
))) {
1226 debug("%s: Could not read KBC ID\n", __func__
);
1230 } else if (0 == strcmp("info", cmd
)) {
1231 struct ec_response_mkbp_info info
;
1233 if (cros_ec_info(dev
, &info
)) {
1234 debug("%s: Could not read KBC info\n", __func__
);
1237 printf("rows = %u\n", info
.rows
);
1238 printf("cols = %u\n", info
.cols
);
1239 printf("switches = %#x\n", info
.switches
);
1240 } else if (0 == strcmp("curimage", cmd
)) {
1241 enum ec_current_image image
;
1243 if (cros_ec_read_current_image(dev
, &image
)) {
1244 debug("%s: Could not read KBC image\n", __func__
);
1247 printf("%d\n", image
);
1248 } else if (0 == strcmp("hash", cmd
)) {
1249 struct ec_response_vboot_hash hash
;
1252 if (cros_ec_read_hash(dev
, &hash
)) {
1253 debug("%s: Could not read KBC hash\n", __func__
);
1257 if (hash
.hash_type
== EC_VBOOT_HASH_TYPE_SHA256
)
1258 printf("type: SHA-256\n");
1260 printf("type: %d\n", hash
.hash_type
);
1262 printf("offset: 0x%08x\n", hash
.offset
);
1263 printf("size: 0x%08x\n", hash
.size
);
1266 for (i
= 0; i
< hash
.digest_size
; i
++)
1267 printf("%02x", hash
.hash_digest
[i
]);
1269 } else if (0 == strcmp("reboot", cmd
)) {
1271 enum ec_reboot_cmd cmd
;
1273 if (argc
>= 3 && !strcmp(argv
[2], "cold"))
1274 cmd
= EC_REBOOT_COLD
;
1276 region
= cros_ec_decode_region(argc
- 2, argv
+ 2);
1277 if (region
== EC_FLASH_REGION_RO
)
1278 cmd
= EC_REBOOT_JUMP_RO
;
1279 else if (region
== EC_FLASH_REGION_RW
)
1280 cmd
= EC_REBOOT_JUMP_RW
;
1282 return CMD_RET_USAGE
;
1285 if (cros_ec_reboot(dev
, cmd
, 0)) {
1286 debug("%s: Could not reboot KBC\n", __func__
);
1289 } else if (0 == strcmp("events", cmd
)) {
1292 if (cros_ec_get_host_events(dev
, &events
)) {
1293 debug("%s: Could not read host events\n", __func__
);
1296 printf("0x%08x\n", events
);
1297 } else if (0 == strcmp("clrevents", cmd
)) {
1298 uint32_t events
= 0x7fffffff;
1301 events
= simple_strtol(argv
[2], NULL
, 0);
1303 if (cros_ec_clear_host_events(dev
, events
)) {
1304 debug("%s: Could not clear host events\n", __func__
);
1307 } else if (0 == strcmp("read", cmd
)) {
1308 ret
= do_read_write(dev
, 0, argc
, argv
);
1310 return CMD_RET_USAGE
;
1311 } else if (0 == strcmp("write", cmd
)) {
1312 ret
= do_read_write(dev
, 1, argc
, argv
);
1314 return CMD_RET_USAGE
;
1315 } else if (0 == strcmp("erase", cmd
)) {
1316 int region
= cros_ec_decode_region(argc
- 2, argv
+ 2);
1317 uint32_t offset
, size
;
1320 return CMD_RET_USAGE
;
1321 if (cros_ec_flash_offset(dev
, region
, &offset
, &size
)) {
1322 debug("%s: Could not read region info\n", __func__
);
1325 ret
= cros_ec_flash_erase(dev
, offset
, size
);
1327 debug("%s: Could not erase region\n",
1331 } else if (0 == strcmp("regioninfo", cmd
)) {
1332 int region
= cros_ec_decode_region(argc
- 2, argv
+ 2);
1333 uint32_t offset
, size
;
1336 return CMD_RET_USAGE
;
1337 ret
= cros_ec_flash_offset(dev
, region
, &offset
, &size
);
1339 debug("%s: Could not read region info\n", __func__
);
1341 printf("Region: %s\n", region
== EC_FLASH_REGION_RO
?
1343 printf("Offset: %x\n", offset
);
1344 printf("Size: %x\n", size
);
1346 } else if (0 == strcmp("vbnvcontext", cmd
)) {
1347 uint8_t block
[EC_VBNV_BLOCK_SIZE
];
1350 unsigned long result
;
1353 ret
= cros_ec_read_vbnvcontext(dev
, block
);
1355 printf("vbnv_block: ");
1356 for (i
= 0; i
< EC_VBNV_BLOCK_SIZE
; i
++)
1357 printf("%02x", block
[i
]);
1362 * TODO(clchiou): Move this to a utility function as
1363 * cmd_spi might want to call it.
1365 memset(block
, 0, EC_VBNV_BLOCK_SIZE
);
1366 len
= strlen(argv
[2]);
1368 for (i
= 0; i
< EC_VBNV_BLOCK_SIZE
; i
++) {
1371 buf
[0] = argv
[2][i
* 2];
1372 if (i
* 2 + 1 >= len
)
1375 buf
[1] = argv
[2][i
* 2 + 1];
1376 strict_strtoul(buf
, 16, &result
);
1379 ret
= cros_ec_write_vbnvcontext(dev
, block
);
1382 debug("%s: Could not %s VbNvContext\n", __func__
,
1383 argc
<= 2 ? "read" : "write");
1385 } else if (0 == strcmp("test", cmd
)) {
1386 int result
= cros_ec_test(dev
);
1389 printf("Test failed with error %d\n", result
);
1391 puts("Test passed\n");
1392 } else if (0 == strcmp("version", cmd
)) {
1393 struct ec_response_get_version
*p
;
1396 ret
= cros_ec_read_version(dev
, &p
);
1398 /* Print versions */
1399 printf("RO version: %1.*s\n",
1400 (int)sizeof(p
->version_string_ro
),
1401 p
->version_string_ro
);
1402 printf("RW version: %1.*s\n",
1403 (int)sizeof(p
->version_string_rw
),
1404 p
->version_string_rw
);
1405 printf("Firmware copy: %s\n",
1407 ARRAY_SIZE(ec_current_image_name
) ?
1408 ec_current_image_name
[p
->current_image
] :
1410 ret
= cros_ec_read_build_info(dev
, &build_string
);
1412 printf("Build info: %s\n", build_string
);
1414 } else if (0 == strcmp("ldo", cmd
)) {
1415 uint8_t index
, state
;
1419 return CMD_RET_USAGE
;
1420 index
= simple_strtoul(argv
[2], &endp
, 10);
1421 if (*argv
[2] == 0 || *endp
!= 0)
1422 return CMD_RET_USAGE
;
1424 state
= simple_strtoul(argv
[3], &endp
, 10);
1425 if (*argv
[3] == 0 || *endp
!= 0)
1426 return CMD_RET_USAGE
;
1427 ret
= cros_ec_set_ldo(udev
, index
, state
);
1429 ret
= cros_ec_get_ldo(udev
, index
, &state
);
1431 printf("LDO%d: %s\n", index
,
1432 state
== EC_LDO_STATE_ON
?
1438 debug("%s: Could not access LDO%d\n", __func__
, index
);
1442 return CMD_RET_USAGE
;
1446 printf("Error: CROS-EC command failed (error %d)\n", ret
);
1454 crosec
, 6, 1, do_cros_ec
,
1455 "CROS-EC utility command",
1456 "init Re-init CROS-EC (done on startup automatically)\n"
1457 "crosec id Read CROS-EC ID\n"
1458 "crosec info Read CROS-EC info\n"
1459 "crosec curimage Read CROS-EC current image\n"
1460 "crosec hash Read CROS-EC hash\n"
1461 "crosec reboot [rw | ro | cold] Reboot CROS-EC\n"
1462 "crosec events Read CROS-EC host events\n"
1463 "crosec clrevents [mask] Clear CROS-EC host events\n"
1464 "crosec regioninfo <ro|rw> Read image info\n"
1465 "crosec erase <ro|rw> Erase EC image\n"
1466 "crosec read <ro|rw> <addr> [<size>] Read EC image\n"
1467 "crosec write <ro|rw> <addr> [<size>] Write EC image\n"
1468 "crosec vbnvcontext [hexstring] Read [write] VbNvContext from EC\n"
1469 "crosec ldo <idx> [<state>] Switch/Read LDO state\n"
1470 "crosec test run tests on cros_ec\n"
1471 "crosec version Read CROS-EC version"
1475 UCLASS_DRIVER(cros_ec
) = {
1476 .id
= UCLASS_CROS_EC
,
1478 .per_device_auto_alloc_size
= sizeof(struct cros_ec_dev
),
1479 .post_bind
= dm_scan_fdt_dev
,