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 <asm/errno.h>
27 #include <asm-generic/gpio.h>
28 #include <dm/device-internal.h>
30 #include <dm/uclass-internal.h>
33 #define debug_trace(fmt, b...) debug(fmt, #b)
35 #define debug_trace(fmt, b...)
39 /* Timeout waiting for a flash erase command to complete */
40 CROS_EC_CMD_TIMEOUT_MS = 5000,
41 /* Timeout waiting for a synchronous hash to be recomputed */
42 CROS_EC_CMD_HASH_TIMEOUT_MS = 2000,
45 DECLARE_GLOBAL_DATA_PTR;
47 /* Note: depends on enum ec_current_image */
48 static const char * const ec_current_image_name[] = {"unknown", "RO", "RW"};
50 void cros_ec_dump_data(const char *name, int cmd, const uint8_t *data, int len)
57 printf("cmd=%#x: ", cmd);
58 for (i = 0; i < len; i++)
59 printf("%02x ", data[i]);
65 * Calculate a simple 8-bit checksum of a data block
67 * @param data Data block to checksum
68 * @param size Size of data block in bytes
69 * @return checksum value (0 to 255)
71 int cros_ec_calc_checksum(const uint8_t *data, int size)
75 for (i = csum = 0; i < size; i++)
81 * Create a request packet for protocol version 3.
83 * The packet is stored in the device's internal output buffer.
85 * @param dev CROS-EC device
86 * @param cmd Command to send (EC_CMD_...)
87 * @param cmd_version Version of command to send (EC_VER_...)
88 * @param dout Output data (may be NULL If dout_len=0)
89 * @param dout_len Size of output data in bytes
90 * @return packet size in bytes, or <0 if error.
92 static int create_proto3_request(struct cros_ec_dev *dev,
93 int cmd, int cmd_version,
94 const void *dout, int dout_len)
96 struct ec_host_request *rq = (struct ec_host_request *)dev->dout;
97 int out_bytes = dout_len + sizeof(*rq);
99 /* Fail if output size is too big */
100 if (out_bytes > (int)sizeof(dev->dout)) {
101 debug("%s: Cannot send %d bytes\n", __func__, dout_len);
102 return -EC_RES_REQUEST_TRUNCATED;
105 /* Fill in request packet */
106 rq->struct_version = EC_HOST_REQUEST_VERSION;
109 rq->command_version = cmd_version;
111 rq->data_len = dout_len;
113 /* Copy data after header */
114 memcpy(rq + 1, dout, dout_len);
116 /* Write checksum field so the entire packet sums to 0 */
117 rq->checksum = (uint8_t)(-cros_ec_calc_checksum(dev->dout, out_bytes));
119 cros_ec_dump_data("out", cmd, dev->dout, out_bytes);
121 /* Return size of request packet */
126 * Prepare the device to receive a protocol version 3 response.
128 * @param dev CROS-EC device
129 * @param din_len Maximum size of response in bytes
130 * @return maximum expected number of bytes in response, or <0 if error.
132 static int prepare_proto3_response_buffer(struct cros_ec_dev *dev, int din_len)
134 int in_bytes = din_len + sizeof(struct ec_host_response);
136 /* Fail if input size is too big */
137 if (in_bytes > (int)sizeof(dev->din)) {
138 debug("%s: Cannot receive %d bytes\n", __func__, din_len);
139 return -EC_RES_RESPONSE_TOO_BIG;
142 /* Return expected size of response packet */
147 * Handle a protocol version 3 response packet.
149 * The packet must already be stored in the device's internal input buffer.
151 * @param dev CROS-EC device
152 * @param dinp Returns pointer to response data
153 * @param din_len Maximum size of response in bytes
154 * @return number of bytes of response data, or <0 if error. Note that error
155 * codes can be from errno.h or -ve EC_RES_INVALID_CHECKSUM values (and they
158 static int handle_proto3_response(struct cros_ec_dev *dev,
159 uint8_t **dinp, int din_len)
161 struct ec_host_response *rs = (struct ec_host_response *)dev->din;
165 cros_ec_dump_data("in-header", -1, dev->din, sizeof(*rs));
167 /* Check input data */
168 if (rs->struct_version != EC_HOST_RESPONSE_VERSION) {
169 debug("%s: EC response version mismatch\n", __func__);
170 return -EC_RES_INVALID_RESPONSE;
174 debug("%s: EC response reserved != 0\n", __func__);
175 return -EC_RES_INVALID_RESPONSE;
178 if (rs->data_len > din_len) {
179 debug("%s: EC returned too much data\n", __func__);
180 return -EC_RES_RESPONSE_TOO_BIG;
183 cros_ec_dump_data("in-data", -1, dev->din + sizeof(*rs), rs->data_len);
185 /* Update in_bytes to actual data size */
186 in_bytes = sizeof(*rs) + rs->data_len;
188 /* Verify checksum */
189 csum = cros_ec_calc_checksum(dev->din, in_bytes);
191 debug("%s: EC response checksum invalid: 0x%02x\n", __func__,
193 return -EC_RES_INVALID_CHECKSUM;
196 /* Return error result, if any */
198 return -(int)rs->result;
200 /* If we're still here, set response data pointer and return length */
201 *dinp = (uint8_t *)(rs + 1);
206 static int send_command_proto3(struct cros_ec_dev *dev,
207 int cmd, int cmd_version,
208 const void *dout, int dout_len,
209 uint8_t **dinp, int din_len)
211 struct dm_cros_ec_ops *ops;
212 int out_bytes, in_bytes;
215 /* Create request packet */
216 out_bytes = create_proto3_request(dev, cmd, cmd_version,
221 /* Prepare response buffer */
222 in_bytes = prepare_proto3_response_buffer(dev, din_len);
226 ops = dm_cros_ec_get_ops(dev->dev);
227 rv = ops->packet ? ops->packet(dev->dev, out_bytes, in_bytes) : -ENOSYS;
231 /* Process the response */
232 return handle_proto3_response(dev, dinp, din_len);
235 static int send_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
236 const void *dout, int dout_len,
237 uint8_t **dinp, int din_len)
239 struct dm_cros_ec_ops *ops;
242 /* Handle protocol version 3 support */
243 if (dev->protocol_version == 3) {
244 return send_command_proto3(dev, cmd, cmd_version,
245 dout, dout_len, dinp, din_len);
248 ops = dm_cros_ec_get_ops(dev->dev);
249 ret = ops->command(dev->dev, cmd, cmd_version,
250 (const uint8_t *)dout, dout_len, dinp, din_len);
256 * Send a command to the CROS-EC device and return the reply.
258 * The device's internal input/output buffers are used.
260 * @param dev CROS-EC device
261 * @param cmd Command to send (EC_CMD_...)
262 * @param cmd_version Version of command to send (EC_VER_...)
263 * @param dout Output data (may be NULL If dout_len=0)
264 * @param dout_len Size of output data in bytes
265 * @param dinp Response data (may be NULL If din_len=0).
266 * If not NULL, it will be updated to point to the data
267 * and will always be double word aligned (64-bits)
268 * @param din_len Maximum size of response in bytes
269 * @return number of bytes in response, or -ve on error
271 static int ec_command_inptr(struct cros_ec_dev *dev, uint8_t cmd,
272 int cmd_version, const void *dout, int dout_len, uint8_t **dinp,
278 len = send_command(dev, cmd, cmd_version, dout, dout_len,
281 /* If the command doesn't complete, wait a while */
282 if (len == -EC_RES_IN_PROGRESS) {
283 struct ec_response_get_comms_status *resp = NULL;
286 /* Wait for command to complete */
287 start = get_timer(0);
291 mdelay(50); /* Insert some reasonable delay */
292 ret = send_command(dev, EC_CMD_GET_COMMS_STATUS, 0,
294 (uint8_t **)&resp, sizeof(*resp));
298 if (get_timer(start) > CROS_EC_CMD_TIMEOUT_MS) {
299 debug("%s: Command %#02x timeout\n",
301 return -EC_RES_TIMEOUT;
303 } while (resp->flags & EC_COMMS_STATUS_PROCESSING);
305 /* OK it completed, so read the status response */
306 /* not sure why it was 0 for the last argument */
307 len = send_command(dev, EC_CMD_RESEND_RESPONSE, 0,
308 NULL, 0, &din, din_len);
311 debug("%s: len=%d, dinp=%p, *dinp=%p\n", __func__, len, dinp,
312 dinp ? *dinp : NULL);
314 /* If we have any data to return, it must be 64bit-aligned */
315 assert(len <= 0 || !((uintptr_t)din & 7));
323 * Send a command to the CROS-EC device and return the reply.
325 * The device's internal input/output buffers are used.
327 * @param dev CROS-EC device
328 * @param cmd Command to send (EC_CMD_...)
329 * @param cmd_version Version of command to send (EC_VER_...)
330 * @param dout Output data (may be NULL If dout_len=0)
331 * @param dout_len Size of output data in bytes
332 * @param din Response data (may be NULL If din_len=0).
333 * It not NULL, it is a place for ec_command() to copy the
335 * @param din_len Maximum size of response in bytes
336 * @return number of bytes in response, or -ve on error
338 static int ec_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
339 const void *dout, int dout_len,
340 void *din, int din_len)
345 assert((din_len == 0) || din);
346 len = ec_command_inptr(dev, cmd, cmd_version, dout, dout_len,
347 &in_buffer, din_len);
350 * If we were asked to put it somewhere, do so, otherwise just
351 * disregard the result.
353 if (din && in_buffer) {
354 assert(len <= din_len);
355 memmove(din, in_buffer, len);
361 int cros_ec_scan_keyboard(struct cros_ec_dev *dev, struct mbkp_keyscan *scan)
363 if (ec_command(dev, EC_CMD_MKBP_STATE, 0, NULL, 0, scan,
364 sizeof(scan->data)) != sizeof(scan->data))
370 int cros_ec_read_id(struct cros_ec_dev *dev, char *id, int maxlen)
372 struct ec_response_get_version *r;
374 if (ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0,
375 (uint8_t **)&r, sizeof(*r)) != sizeof(*r))
378 if (maxlen > (int)sizeof(r->version_string_ro))
379 maxlen = sizeof(r->version_string_ro);
381 switch (r->current_image) {
383 memcpy(id, r->version_string_ro, maxlen);
386 memcpy(id, r->version_string_rw, maxlen);
392 id[maxlen - 1] = '\0';
396 int cros_ec_read_version(struct cros_ec_dev *dev,
397 struct ec_response_get_version **versionp)
399 if (ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0,
400 (uint8_t **)versionp, sizeof(**versionp))
401 != sizeof(**versionp))
407 int cros_ec_read_build_info(struct cros_ec_dev *dev, char **strp)
409 if (ec_command_inptr(dev, EC_CMD_GET_BUILD_INFO, 0, NULL, 0,
410 (uint8_t **)strp, EC_PROTO2_MAX_PARAM_SIZE) < 0)
416 int cros_ec_read_current_image(struct cros_ec_dev *dev,
417 enum ec_current_image *image)
419 struct ec_response_get_version *r;
421 if (ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0,
422 (uint8_t **)&r, sizeof(*r)) != sizeof(*r))
425 *image = r->current_image;
429 static int cros_ec_wait_on_hash_done(struct cros_ec_dev *dev,
430 struct ec_response_vboot_hash *hash)
432 struct ec_params_vboot_hash p;
435 start = get_timer(0);
436 while (hash->status == EC_VBOOT_HASH_STATUS_BUSY) {
437 mdelay(50); /* Insert some reasonable delay */
439 p.cmd = EC_VBOOT_HASH_GET;
440 if (ec_command(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p),
441 hash, sizeof(*hash)) < 0)
444 if (get_timer(start) > CROS_EC_CMD_HASH_TIMEOUT_MS) {
445 debug("%s: EC_VBOOT_HASH_GET timeout\n", __func__);
446 return -EC_RES_TIMEOUT;
453 int cros_ec_read_hash(struct cros_ec_dev *dev,
454 struct ec_response_vboot_hash *hash)
456 struct ec_params_vboot_hash p;
459 p.cmd = EC_VBOOT_HASH_GET;
460 if (ec_command(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p),
461 hash, sizeof(*hash)) < 0)
464 /* If the EC is busy calculating the hash, fidget until it's done. */
465 rv = cros_ec_wait_on_hash_done(dev, hash);
469 /* If the hash is valid, we're done. Otherwise, we have to kick it off
470 * again and wait for it to complete. Note that we explicitly assume
471 * that hashing zero bytes is always wrong, even though that would
472 * produce a valid hash value. */
473 if (hash->status == EC_VBOOT_HASH_STATUS_DONE && hash->size)
476 debug("%s: No valid hash (status=%d size=%d). Compute one...\n",
477 __func__, hash->status, hash->size);
479 p.cmd = EC_VBOOT_HASH_START;
480 p.hash_type = EC_VBOOT_HASH_TYPE_SHA256;
482 p.offset = EC_VBOOT_HASH_OFFSET_RW;
484 if (ec_command(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p),
485 hash, sizeof(*hash)) < 0)
488 rv = cros_ec_wait_on_hash_done(dev, hash);
492 debug("%s: hash done\n", __func__);
497 static int cros_ec_invalidate_hash(struct cros_ec_dev *dev)
499 struct ec_params_vboot_hash p;
500 struct ec_response_vboot_hash *hash;
502 /* We don't have an explict command for the EC to discard its current
503 * hash value, so we'll just tell it to calculate one that we know is
504 * wrong (we claim that hashing zero bytes is always invalid).
506 p.cmd = EC_VBOOT_HASH_RECALC;
507 p.hash_type = EC_VBOOT_HASH_TYPE_SHA256;
512 debug("%s:\n", __func__);
514 if (ec_command_inptr(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p),
515 (uint8_t **)&hash, sizeof(*hash)) < 0)
518 /* No need to wait for it to finish */
522 int cros_ec_reboot(struct cros_ec_dev *dev, enum ec_reboot_cmd cmd,
525 struct ec_params_reboot_ec p;
530 if (ec_command_inptr(dev, EC_CMD_REBOOT_EC, 0, &p, sizeof(p), NULL, 0)
534 if (!(flags & EC_REBOOT_FLAG_ON_AP_SHUTDOWN)) {
536 * EC reboot will take place immediately so delay to allow it
537 * to complete. Note that some reboot types (EC_REBOOT_COLD)
538 * will reboot the AP as well, in which case we won't actually
542 * TODO(rspangler@chromium.org): Would be nice if we had a
543 * better way to determine when the reboot is complete. Could
544 * we poll a memory-mapped LPC value?
552 int cros_ec_interrupt_pending(struct cros_ec_dev *dev)
554 /* no interrupt support : always poll */
555 if (!dm_gpio_is_valid(&dev->ec_int))
558 return dm_gpio_get_value(&dev->ec_int);
561 int cros_ec_info(struct cros_ec_dev *dev, struct ec_response_mkbp_info *info)
563 if (ec_command(dev, EC_CMD_MKBP_INFO, 0, NULL, 0, info,
564 sizeof(*info)) != sizeof(*info))
570 int cros_ec_get_host_events(struct cros_ec_dev *dev, uint32_t *events_ptr)
572 struct ec_response_host_event_mask *resp;
575 * Use the B copy of the event flags, because the main copy is already
578 if (ec_command_inptr(dev, EC_CMD_HOST_EVENT_GET_B, 0, NULL, 0,
579 (uint8_t **)&resp, sizeof(*resp)) < (int)sizeof(*resp))
582 if (resp->mask & EC_HOST_EVENT_MASK(EC_HOST_EVENT_INVALID))
585 *events_ptr = resp->mask;
589 int cros_ec_clear_host_events(struct cros_ec_dev *dev, uint32_t events)
591 struct ec_params_host_event_mask params;
593 params.mask = events;
596 * Use the B copy of the event flags, so it affects the data returned
597 * by cros_ec_get_host_events().
599 if (ec_command_inptr(dev, EC_CMD_HOST_EVENT_CLEAR_B, 0,
600 ¶ms, sizeof(params), NULL, 0) < 0)
606 int cros_ec_flash_protect(struct cros_ec_dev *dev,
607 uint32_t set_mask, uint32_t set_flags,
608 struct ec_response_flash_protect *resp)
610 struct ec_params_flash_protect params;
612 params.mask = set_mask;
613 params.flags = set_flags;
615 if (ec_command(dev, EC_CMD_FLASH_PROTECT, EC_VER_FLASH_PROTECT,
616 ¶ms, sizeof(params),
617 resp, sizeof(*resp)) != sizeof(*resp))
623 static int cros_ec_check_version(struct cros_ec_dev *dev)
625 struct ec_params_hello req;
626 struct ec_response_hello *resp;
628 struct dm_cros_ec_ops *ops;
631 ops = dm_cros_ec_get_ops(dev->dev);
632 if (ops->check_version) {
633 ret = ops->check_version(dev->dev);
639 * TODO(sjg@chromium.org).
640 * There is a strange oddity here with the EC. We could just ignore
641 * the response, i.e. pass the last two parameters as NULL and 0.
642 * In this case we won't read back very many bytes from the EC.
643 * On the I2C bus the EC gets upset about this and will try to send
644 * the bytes anyway. This means that we will have to wait for that
645 * to complete before continuing with a new EC command.
647 * This problem is probably unique to the I2C bus.
649 * So for now, just read all the data anyway.
652 /* Try sending a version 3 packet */
653 dev->protocol_version = 3;
655 if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req),
656 (uint8_t **)&resp, sizeof(*resp)) > 0) {
660 /* Try sending a version 2 packet */
661 dev->protocol_version = 2;
662 if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req),
663 (uint8_t **)&resp, sizeof(*resp)) > 0) {
668 * Fail if we're still here, since the EC doesn't understand any
669 * protcol version we speak. Version 1 interface without command
670 * version is no longer supported, and we don't know about any new
673 dev->protocol_version = 0;
674 printf("%s: ERROR: old EC interface not supported\n", __func__);
678 int cros_ec_test(struct cros_ec_dev *dev)
680 struct ec_params_hello req;
681 struct ec_response_hello *resp;
683 req.in_data = 0x12345678;
684 if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req),
685 (uint8_t **)&resp, sizeof(*resp)) < sizeof(*resp)) {
686 printf("ec_command_inptr() returned error\n");
689 if (resp->out_data != req.in_data + 0x01020304) {
690 printf("Received invalid handshake %x\n", resp->out_data);
697 int cros_ec_flash_offset(struct cros_ec_dev *dev, enum ec_flash_region region,
698 uint32_t *offset, uint32_t *size)
700 struct ec_params_flash_region_info p;
701 struct ec_response_flash_region_info *r;
705 ret = ec_command_inptr(dev, EC_CMD_FLASH_REGION_INFO,
706 EC_VER_FLASH_REGION_INFO,
707 &p, sizeof(p), (uint8_t **)&r, sizeof(*r));
708 if (ret != sizeof(*r))
719 int cros_ec_flash_erase(struct cros_ec_dev *dev, uint32_t offset, uint32_t size)
721 struct ec_params_flash_erase p;
725 return ec_command_inptr(dev, EC_CMD_FLASH_ERASE, 0, &p, sizeof(p),
730 * Write a single block to the flash
732 * Write a block of data to the EC flash. The size must not exceed the flash
733 * write block size which you can obtain from cros_ec_flash_write_burst_size().
735 * The offset starts at 0. You can obtain the region information from
736 * cros_ec_flash_offset() to find out where to write for a particular region.
738 * Attempting to write to the region where the EC is currently running from
739 * will result in an error.
741 * @param dev CROS-EC device
742 * @param data Pointer to data buffer to write
743 * @param offset Offset within flash to write to.
744 * @param size Number of bytes to write
745 * @return 0 if ok, -1 on error
747 static int cros_ec_flash_write_block(struct cros_ec_dev *dev,
748 const uint8_t *data, uint32_t offset, uint32_t size)
750 struct ec_params_flash_write p;
754 assert(data && p.size <= EC_FLASH_WRITE_VER0_SIZE);
755 memcpy(&p + 1, data, p.size);
757 return ec_command_inptr(dev, EC_CMD_FLASH_WRITE, 0,
758 &p, sizeof(p), NULL, 0) >= 0 ? 0 : -1;
762 * Return optimal flash write burst size
764 static int cros_ec_flash_write_burst_size(struct cros_ec_dev *dev)
766 return EC_FLASH_WRITE_VER0_SIZE;
770 * Check if a block of data is erased (all 0xff)
772 * This function is useful when dealing with flash, for checking whether a
773 * data block is erased and thus does not need to be programmed.
775 * @param data Pointer to data to check (must be word-aligned)
776 * @param size Number of bytes to check (must be word-aligned)
777 * @return 0 if erased, non-zero if any word is not erased
779 static int cros_ec_data_is_erased(const uint32_t *data, int size)
782 size /= sizeof(uint32_t);
783 for (; size > 0; size -= 4, data++)
790 int cros_ec_flash_write(struct cros_ec_dev *dev, const uint8_t *data,
791 uint32_t offset, uint32_t size)
793 uint32_t burst = cros_ec_flash_write_burst_size(dev);
798 * TODO: round up to the nearest multiple of write size. Can get away
799 * without that on link right now because its write size is 4 bytes.
802 for (off = offset; off < end; off += burst, data += burst) {
805 /* If the data is empty, there is no point in programming it */
806 todo = min(end - off, burst);
807 if (dev->optimise_flash_write &&
808 cros_ec_data_is_erased((uint32_t *)data, todo))
811 ret = cros_ec_flash_write_block(dev, data, off, todo);
820 * Read a single block from the flash
822 * Read a block of data from the EC flash. The size must not exceed the flash
823 * write block size which you can obtain from cros_ec_flash_write_burst_size().
825 * The offset starts at 0. You can obtain the region information from
826 * cros_ec_flash_offset() to find out where to read for a particular region.
828 * @param dev CROS-EC device
829 * @param data Pointer to data buffer to read into
830 * @param offset Offset within flash to read from
831 * @param size Number of bytes to read
832 * @return 0 if ok, -1 on error
834 static int cros_ec_flash_read_block(struct cros_ec_dev *dev, uint8_t *data,
835 uint32_t offset, uint32_t size)
837 struct ec_params_flash_read p;
842 return ec_command(dev, EC_CMD_FLASH_READ, 0,
843 &p, sizeof(p), data, size) >= 0 ? 0 : -1;
846 int cros_ec_flash_read(struct cros_ec_dev *dev, uint8_t *data, uint32_t offset,
849 uint32_t burst = cros_ec_flash_write_burst_size(dev);
854 for (off = offset; off < end; off += burst, data += burst) {
855 ret = cros_ec_flash_read_block(dev, data, off,
856 min(end - off, burst));
864 int cros_ec_flash_update_rw(struct cros_ec_dev *dev,
865 const uint8_t *image, int image_size)
867 uint32_t rw_offset, rw_size;
870 if (cros_ec_flash_offset(dev, EC_FLASH_REGION_RW, &rw_offset, &rw_size))
872 if (image_size > (int)rw_size)
875 /* Invalidate the existing hash, just in case the AP reboots
876 * unexpectedly during the update. If that happened, the EC RW firmware
877 * would be invalid, but the EC would still have the original hash.
879 ret = cros_ec_invalidate_hash(dev);
884 * Erase the entire RW section, so that the EC doesn't see any garbage
885 * past the new image if it's smaller than the current image.
887 * TODO: could optimize this to erase just the current image, since
888 * presumably everything past that is 0xff's. But would still need to
889 * round up to the nearest multiple of erase size.
891 ret = cros_ec_flash_erase(dev, rw_offset, rw_size);
895 /* Write the image */
896 ret = cros_ec_flash_write(dev, image, rw_offset, image_size);
903 int cros_ec_read_vbnvcontext(struct cros_ec_dev *dev, uint8_t *block)
905 struct ec_params_vbnvcontext p;
908 p.op = EC_VBNV_CONTEXT_OP_READ;
910 len = ec_command(dev, EC_CMD_VBNV_CONTEXT, EC_VER_VBNV_CONTEXT,
911 &p, sizeof(p), block, EC_VBNV_BLOCK_SIZE);
912 if (len < EC_VBNV_BLOCK_SIZE)
918 int cros_ec_write_vbnvcontext(struct cros_ec_dev *dev, const uint8_t *block)
920 struct ec_params_vbnvcontext p;
923 p.op = EC_VBNV_CONTEXT_OP_WRITE;
924 memcpy(p.block, block, sizeof(p.block));
926 len = ec_command_inptr(dev, EC_CMD_VBNV_CONTEXT, EC_VER_VBNV_CONTEXT,
927 &p, sizeof(p), NULL, 0);
934 int cros_ec_set_ldo(struct udevice *dev, uint8_t index, uint8_t state)
936 struct cros_ec_dev *cdev = dev_get_uclass_priv(dev);
937 struct ec_params_ldo_set params;
939 params.index = index;
940 params.state = state;
942 if (ec_command_inptr(cdev, EC_CMD_LDO_SET, 0, ¶ms, sizeof(params),
949 int cros_ec_get_ldo(struct udevice *dev, uint8_t index, uint8_t *state)
951 struct cros_ec_dev *cdev = dev_get_uclass_priv(dev);
952 struct ec_params_ldo_get params;
953 struct ec_response_ldo_get *resp;
955 params.index = index;
957 if (ec_command_inptr(cdev, EC_CMD_LDO_GET, 0, ¶ms, sizeof(params),
958 (uint8_t **)&resp, sizeof(*resp)) !=
962 *state = resp->state;
967 int cros_ec_register(struct udevice *dev)
969 struct cros_ec_dev *cdev = dev_get_uclass_priv(dev);
970 const void *blob = gd->fdt_blob;
971 int node = dev->of_offset;
975 gpio_request_by_name(dev, "ec-interrupt", 0, &cdev->ec_int,
977 cdev->optimise_flash_write = fdtdec_get_bool(blob, node,
978 "optimise-flash-write");
980 if (cros_ec_check_version(cdev)) {
981 debug("%s: Could not detect CROS-EC version\n", __func__);
982 return -CROS_EC_ERR_CHECK_VERSION;
985 if (cros_ec_read_id(cdev, id, sizeof(id))) {
986 debug("%s: Could not read KBC ID\n", __func__);
987 return -CROS_EC_ERR_READ_ID;
990 /* Remember this device for use by the cros_ec command */
991 debug("Google Chrome EC v%d CROS-EC driver ready, id '%s'\n",
992 cdev->protocol_version, id);
997 int cros_ec_decode_region(int argc, char * const argv[])
1000 if (0 == strcmp(*argv, "rw"))
1001 return EC_FLASH_REGION_RW;
1002 else if (0 == strcmp(*argv, "ro"))
1003 return EC_FLASH_REGION_RO;
1005 debug("%s: Invalid region '%s'\n", __func__, *argv);
1007 debug("%s: Missing region parameter\n", __func__);
1013 int cros_ec_decode_ec_flash(const void *blob, int node,
1014 struct fdt_cros_ec *config)
1018 flash_node = fdt_subnode_offset(blob, node, "flash");
1019 if (flash_node < 0) {
1020 debug("Failed to find flash node\n");
1024 if (fdtdec_read_fmap_entry(blob, flash_node, "flash",
1026 debug("Failed to decode flash node in chrome-ec'\n");
1030 config->flash_erase_value = fdtdec_get_int(blob, flash_node,
1032 for (node = fdt_first_subnode(blob, flash_node); node >= 0;
1033 node = fdt_next_subnode(blob, node)) {
1034 const char *name = fdt_get_name(blob, node, NULL);
1035 enum ec_flash_region region;
1037 if (0 == strcmp(name, "ro")) {
1038 region = EC_FLASH_REGION_RO;
1039 } else if (0 == strcmp(name, "rw")) {
1040 region = EC_FLASH_REGION_RW;
1041 } else if (0 == strcmp(name, "wp-ro")) {
1042 region = EC_FLASH_REGION_WP_RO;
1044 debug("Unknown EC flash region name '%s'\n", name);
1048 if (fdtdec_read_fmap_entry(blob, node, "reg",
1049 &config->region[region])) {
1050 debug("Failed to decode flash region in chrome-ec'\n");
1058 int cros_ec_i2c_tunnel(struct udevice *dev, struct i2c_msg *in, int nmsgs)
1060 struct cros_ec_dev *cdev = dev_get_uclass_priv(dev);
1062 struct ec_params_i2c_passthru p;
1063 uint8_t outbuf[EC_PROTO2_MAX_PARAM_SIZE];
1066 struct ec_response_i2c_passthru r;
1067 uint8_t inbuf[EC_PROTO2_MAX_PARAM_SIZE];
1069 struct ec_params_i2c_passthru *p = ¶ms.p;
1070 struct ec_response_i2c_passthru *r = &response.r;
1071 struct ec_params_i2c_passthru_msg *msg;
1072 uint8_t *pdata, *read_ptr = NULL;
1080 p->num_msgs = nmsgs;
1081 size = sizeof(*p) + p->num_msgs * sizeof(*msg);
1083 /* Create a message to write the register address and optional data */
1084 pdata = (uint8_t *)p + size;
1087 for (i = 0, msg = p->msg; i < nmsgs; i++, msg++, in++) {
1088 bool is_read = in->flags & I2C_M_RD;
1090 msg->addr_flags = in->addr;
1093 msg->addr_flags |= EC_I2C_FLAG_READ;
1094 read_len += in->len;
1096 if (sizeof(*r) + read_len > sizeof(response)) {
1097 puts("Read length too big for buffer\n");
1101 if (pdata - (uint8_t *)p + in->len > sizeof(params)) {
1102 puts("Params too large for buffer\n");
1105 memcpy(pdata, in->buf, in->len);
1110 rv = ec_command(cdev, EC_CMD_I2C_PASSTHRU, 0, p, pdata - (uint8_t *)p,
1111 r, sizeof(*r) + read_len);
1115 /* Parse response */
1116 if (r->i2c_status & EC_I2C_STATUS_ERROR) {
1117 printf("Transfer failed with status=0x%x\n", r->i2c_status);
1121 if (rv < sizeof(*r) + read_len) {
1122 puts("Truncated read response\n");
1126 /* We only support a single read message for each transfer */
1128 memcpy(read_ptr, r->data, read_len);
1133 #ifdef CONFIG_CMD_CROS_EC
1136 * Perform a flash read or write command
1138 * @param dev CROS-EC device to read/write
1139 * @param is_write 1 do to a write, 0 to do a read
1140 * @param argc Number of arguments
1141 * @param argv Arguments (2 is region, 3 is address)
1142 * @return 0 for ok, 1 for a usage error or -ve for ec command error
1143 * (negative EC_RES_...)
1145 static int do_read_write(struct cros_ec_dev *dev, int is_write, int argc,
1146 char * const argv[])
1148 uint32_t offset, size = -1U, region_size;
1154 region = cros_ec_decode_region(argc - 2, argv + 2);
1159 addr = simple_strtoul(argv[3], &endp, 16);
1160 if (*argv[3] == 0 || *endp != 0)
1163 size = simple_strtoul(argv[4], &endp, 16);
1164 if (*argv[4] == 0 || *endp != 0)
1168 ret = cros_ec_flash_offset(dev, region, &offset, ®ion_size);
1170 debug("%s: Could not read region info\n", __func__);
1177 cros_ec_flash_write(dev, (uint8_t *)addr, offset, size) :
1178 cros_ec_flash_read(dev, (uint8_t *)addr, offset, size);
1180 debug("%s: Could not %s region\n", __func__,
1181 is_write ? "write" : "read");
1188 static int do_cros_ec(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
1190 struct cros_ec_dev *dev;
1191 struct udevice *udev;
1196 return CMD_RET_USAGE;
1199 if (0 == strcmp("init", cmd)) {
1200 /* Remove any existing device */
1201 ret = uclass_find_device(UCLASS_CROS_EC, 0, &udev);
1203 device_remove(udev);
1204 ret = uclass_get_device(UCLASS_CROS_EC, 0, &udev);
1206 printf("Could not init cros_ec device (err %d)\n", ret);
1212 ret = uclass_get_device(UCLASS_CROS_EC, 0, &udev);
1214 printf("Cannot get cros-ec device (err=%d)\n", ret);
1217 dev = dev_get_uclass_priv(udev);
1218 if (0 == strcmp("id", cmd)) {
1221 if (cros_ec_read_id(dev, id, sizeof(id))) {
1222 debug("%s: Could not read KBC ID\n", __func__);
1226 } else if (0 == strcmp("info", cmd)) {
1227 struct ec_response_mkbp_info info;
1229 if (cros_ec_info(dev, &info)) {
1230 debug("%s: Could not read KBC info\n", __func__);
1233 printf("rows = %u\n", info.rows);
1234 printf("cols = %u\n", info.cols);
1235 printf("switches = %#x\n", info.switches);
1236 } else if (0 == strcmp("curimage", cmd)) {
1237 enum ec_current_image image;
1239 if (cros_ec_read_current_image(dev, &image)) {
1240 debug("%s: Could not read KBC image\n", __func__);
1243 printf("%d\n", image);
1244 } else if (0 == strcmp("hash", cmd)) {
1245 struct ec_response_vboot_hash hash;
1248 if (cros_ec_read_hash(dev, &hash)) {
1249 debug("%s: Could not read KBC hash\n", __func__);
1253 if (hash.hash_type == EC_VBOOT_HASH_TYPE_SHA256)
1254 printf("type: SHA-256\n");
1256 printf("type: %d\n", hash.hash_type);
1258 printf("offset: 0x%08x\n", hash.offset);
1259 printf("size: 0x%08x\n", hash.size);
1262 for (i = 0; i < hash.digest_size; i++)
1263 printf("%02x", hash.hash_digest[i]);
1265 } else if (0 == strcmp("reboot", cmd)) {
1267 enum ec_reboot_cmd cmd;
1269 if (argc >= 3 && !strcmp(argv[2], "cold"))
1270 cmd = EC_REBOOT_COLD;
1272 region = cros_ec_decode_region(argc - 2, argv + 2);
1273 if (region == EC_FLASH_REGION_RO)
1274 cmd = EC_REBOOT_JUMP_RO;
1275 else if (region == EC_FLASH_REGION_RW)
1276 cmd = EC_REBOOT_JUMP_RW;
1278 return CMD_RET_USAGE;
1281 if (cros_ec_reboot(dev, cmd, 0)) {
1282 debug("%s: Could not reboot KBC\n", __func__);
1285 } else if (0 == strcmp("events", cmd)) {
1288 if (cros_ec_get_host_events(dev, &events)) {
1289 debug("%s: Could not read host events\n", __func__);
1292 printf("0x%08x\n", events);
1293 } else if (0 == strcmp("clrevents", cmd)) {
1294 uint32_t events = 0x7fffffff;
1297 events = simple_strtol(argv[2], NULL, 0);
1299 if (cros_ec_clear_host_events(dev, events)) {
1300 debug("%s: Could not clear host events\n", __func__);
1303 } else if (0 == strcmp("read", cmd)) {
1304 ret = do_read_write(dev, 0, argc, argv);
1306 return CMD_RET_USAGE;
1307 } else if (0 == strcmp("write", cmd)) {
1308 ret = do_read_write(dev, 1, argc, argv);
1310 return CMD_RET_USAGE;
1311 } else if (0 == strcmp("erase", cmd)) {
1312 int region = cros_ec_decode_region(argc - 2, argv + 2);
1313 uint32_t offset, size;
1316 return CMD_RET_USAGE;
1317 if (cros_ec_flash_offset(dev, region, &offset, &size)) {
1318 debug("%s: Could not read region info\n", __func__);
1321 ret = cros_ec_flash_erase(dev, offset, size);
1323 debug("%s: Could not erase region\n",
1327 } else if (0 == strcmp("regioninfo", cmd)) {
1328 int region = cros_ec_decode_region(argc - 2, argv + 2);
1329 uint32_t offset, size;
1332 return CMD_RET_USAGE;
1333 ret = cros_ec_flash_offset(dev, region, &offset, &size);
1335 debug("%s: Could not read region info\n", __func__);
1337 printf("Region: %s\n", region == EC_FLASH_REGION_RO ?
1339 printf("Offset: %x\n", offset);
1340 printf("Size: %x\n", size);
1342 } else if (0 == strcmp("vbnvcontext", cmd)) {
1343 uint8_t block[EC_VBNV_BLOCK_SIZE];
1346 unsigned long result;
1349 ret = cros_ec_read_vbnvcontext(dev, block);
1351 printf("vbnv_block: ");
1352 for (i = 0; i < EC_VBNV_BLOCK_SIZE; i++)
1353 printf("%02x", block[i]);
1358 * TODO(clchiou): Move this to a utility function as
1359 * cmd_spi might want to call it.
1361 memset(block, 0, EC_VBNV_BLOCK_SIZE);
1362 len = strlen(argv[2]);
1364 for (i = 0; i < EC_VBNV_BLOCK_SIZE; i++) {
1367 buf[0] = argv[2][i * 2];
1368 if (i * 2 + 1 >= len)
1371 buf[1] = argv[2][i * 2 + 1];
1372 strict_strtoul(buf, 16, &result);
1375 ret = cros_ec_write_vbnvcontext(dev, block);
1378 debug("%s: Could not %s VbNvContext\n", __func__,
1379 argc <= 2 ? "read" : "write");
1381 } else if (0 == strcmp("test", cmd)) {
1382 int result = cros_ec_test(dev);
1385 printf("Test failed with error %d\n", result);
1387 puts("Test passed\n");
1388 } else if (0 == strcmp("version", cmd)) {
1389 struct ec_response_get_version *p;
1392 ret = cros_ec_read_version(dev, &p);
1394 /* Print versions */
1395 printf("RO version: %1.*s\n",
1396 (int)sizeof(p->version_string_ro),
1397 p->version_string_ro);
1398 printf("RW version: %1.*s\n",
1399 (int)sizeof(p->version_string_rw),
1400 p->version_string_rw);
1401 printf("Firmware copy: %s\n",
1403 ARRAY_SIZE(ec_current_image_name) ?
1404 ec_current_image_name[p->current_image] :
1406 ret = cros_ec_read_build_info(dev, &build_string);
1408 printf("Build info: %s\n", build_string);
1410 } else if (0 == strcmp("ldo", cmd)) {
1411 uint8_t index, state;
1415 return CMD_RET_USAGE;
1416 index = simple_strtoul(argv[2], &endp, 10);
1417 if (*argv[2] == 0 || *endp != 0)
1418 return CMD_RET_USAGE;
1420 state = simple_strtoul(argv[3], &endp, 10);
1421 if (*argv[3] == 0 || *endp != 0)
1422 return CMD_RET_USAGE;
1423 ret = cros_ec_set_ldo(udev, index, state);
1425 ret = cros_ec_get_ldo(udev, index, &state);
1427 printf("LDO%d: %s\n", index,
1428 state == EC_LDO_STATE_ON ?
1434 debug("%s: Could not access LDO%d\n", __func__, index);
1438 return CMD_RET_USAGE;
1442 printf("Error: CROS-EC command failed (error %d)\n", ret);
1449 int cros_ec_post_bind(struct udevice *dev)
1451 /* Scan for available EC devices (e.g. I2C tunnel) */
1452 return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
1456 crosec, 6, 1, do_cros_ec,
1457 "CROS-EC utility command",
1458 "init Re-init CROS-EC (done on startup automatically)\n"
1459 "crosec id Read CROS-EC ID\n"
1460 "crosec info Read CROS-EC info\n"
1461 "crosec curimage Read CROS-EC current image\n"
1462 "crosec hash Read CROS-EC hash\n"
1463 "crosec reboot [rw | ro | cold] Reboot CROS-EC\n"
1464 "crosec events Read CROS-EC host events\n"
1465 "crosec clrevents [mask] Clear CROS-EC host events\n"
1466 "crosec regioninfo <ro|rw> Read image info\n"
1467 "crosec erase <ro|rw> Erase EC image\n"
1468 "crosec read <ro|rw> <addr> [<size>] Read EC image\n"
1469 "crosec write <ro|rw> <addr> [<size>] Write EC image\n"
1470 "crosec vbnvcontext [hexstring] Read [write] VbNvContext from EC\n"
1471 "crosec ldo <idx> [<state>] Switch/Read LDO state\n"
1472 "crosec test run tests on cros_ec\n"
1473 "crosec version Read CROS-EC version"
1477 UCLASS_DRIVER(cros_ec) = {
1478 .id = UCLASS_CROS_EC,
1480 .per_device_auto_alloc_size = sizeof(struct cros_ec_dev),
1481 .post_bind = cros_ec_post_bind,