1 // SPDX-License-Identifier: GPL-2.0+
3 * Chromium OS cros_ec driver
5 * Copyright (c) 2012 The Chromium OS Authors.
9 * This is the interface to the Chrome OS EC. It provides keyboard functions,
10 * power control and battery management. Quite a few other functions are
11 * provided to enable the EC software to be updated, talk to the EC's I2C bus
12 * and store a small amount of data in a memory which persists while the EC
16 #define LOG_CATEGORY UCLASS_CROS_EC
26 #include <linux/errno.h>
28 #include <asm-generic/gpio.h>
29 #include <dm/device-internal.h>
30 #include <dm/of_extra.h>
31 #include <dm/uclass-internal.h>
34 #define debug_trace(fmt, b...) debug(fmt, #b)
36 #define debug_trace(fmt, b...)
40 /* Timeout waiting for a flash erase command to complete */
41 CROS_EC_CMD_TIMEOUT_MS = 5000,
42 /* Timeout waiting for a synchronous hash to be recomputed */
43 CROS_EC_CMD_HASH_TIMEOUT_MS = 2000,
46 #define INVALID_HCMD 0xFF
49 * Map UHEPI masks to non UHEPI commands in order to support old EC FW
50 * which does not support UHEPI command.
57 [EC_HOST_EVENT_MAIN] = {
58 INVALID_HCMD, EC_CMD_HOST_EVENT_CLEAR,
62 INVALID_HCMD, EC_CMD_HOST_EVENT_CLEAR_B,
63 EC_CMD_HOST_EVENT_GET_B,
65 [EC_HOST_EVENT_SCI_MASK] = {
66 EC_CMD_HOST_EVENT_SET_SCI_MASK, INVALID_HCMD,
67 EC_CMD_HOST_EVENT_GET_SCI_MASK,
69 [EC_HOST_EVENT_SMI_MASK] = {
70 EC_CMD_HOST_EVENT_SET_SMI_MASK, INVALID_HCMD,
71 EC_CMD_HOST_EVENT_GET_SMI_MASK,
73 [EC_HOST_EVENT_ALWAYS_REPORT_MASK] = {
74 INVALID_HCMD, INVALID_HCMD, INVALID_HCMD,
76 [EC_HOST_EVENT_ACTIVE_WAKE_MASK] = {
77 EC_CMD_HOST_EVENT_SET_WAKE_MASK, INVALID_HCMD,
78 EC_CMD_HOST_EVENT_GET_WAKE_MASK,
80 [EC_HOST_EVENT_LAZY_WAKE_MASK_S0IX] = {
81 EC_CMD_HOST_EVENT_SET_WAKE_MASK, INVALID_HCMD,
82 EC_CMD_HOST_EVENT_GET_WAKE_MASK,
84 [EC_HOST_EVENT_LAZY_WAKE_MASK_S3] = {
85 EC_CMD_HOST_EVENT_SET_WAKE_MASK, INVALID_HCMD,
86 EC_CMD_HOST_EVENT_GET_WAKE_MASK,
88 [EC_HOST_EVENT_LAZY_WAKE_MASK_S5] = {
89 EC_CMD_HOST_EVENT_SET_WAKE_MASK, INVALID_HCMD,
90 EC_CMD_HOST_EVENT_GET_WAKE_MASK,
94 void cros_ec_dump_data(const char *name, int cmd, const uint8_t *data, int len)
101 printf("cmd=%#x: ", cmd);
102 for (i = 0; i < len; i++)
103 printf("%02x ", data[i]);
109 * Calculate a simple 8-bit checksum of a data block
111 * @param data Data block to checksum
112 * @param size Size of data block in bytes
113 * @return checksum value (0 to 255)
115 int cros_ec_calc_checksum(const uint8_t *data, int size)
119 for (i = csum = 0; i < size; i++)
125 * Create a request packet for protocol version 3.
127 * The packet is stored in the device's internal output buffer.
129 * @param dev CROS-EC device
130 * @param cmd Command to send (EC_CMD_...)
131 * @param cmd_version Version of command to send (EC_VER_...)
132 * @param dout Output data (may be NULL If dout_len=0)
133 * @param dout_len Size of output data in bytes
134 * @return packet size in bytes, or <0 if error.
136 static int create_proto3_request(struct cros_ec_dev *cdev,
137 int cmd, int cmd_version,
138 const void *dout, int dout_len)
140 struct ec_host_request *rq = (struct ec_host_request *)cdev->dout;
141 int out_bytes = dout_len + sizeof(*rq);
143 /* Fail if output size is too big */
144 if (out_bytes > (int)sizeof(cdev->dout)) {
145 debug("%s: Cannot send %d bytes\n", __func__, dout_len);
146 return -EC_RES_REQUEST_TRUNCATED;
149 /* Fill in request packet */
150 rq->struct_version = EC_HOST_REQUEST_VERSION;
153 rq->command_version = cmd_version;
155 rq->data_len = dout_len;
157 /* Copy data after header */
158 memcpy(rq + 1, dout, dout_len);
160 /* Write checksum field so the entire packet sums to 0 */
161 rq->checksum = (uint8_t)(-cros_ec_calc_checksum(cdev->dout, out_bytes));
163 cros_ec_dump_data("out", cmd, cdev->dout, out_bytes);
165 /* Return size of request packet */
170 * Prepare the device to receive a protocol version 3 response.
172 * @param dev CROS-EC device
173 * @param din_len Maximum size of response in bytes
174 * @return maximum expected number of bytes in response, or <0 if error.
176 static int prepare_proto3_response_buffer(struct cros_ec_dev *cdev, int din_len)
178 int in_bytes = din_len + sizeof(struct ec_host_response);
180 /* Fail if input size is too big */
181 if (in_bytes > (int)sizeof(cdev->din)) {
182 debug("%s: Cannot receive %d bytes\n", __func__, din_len);
183 return -EC_RES_RESPONSE_TOO_BIG;
186 /* Return expected size of response packet */
191 * Handle a protocol version 3 response packet.
193 * The packet must already be stored in the device's internal input buffer.
195 * @param dev CROS-EC device
196 * @param dinp Returns pointer to response data
197 * @param din_len Maximum size of response in bytes
198 * @return number of bytes of response data, or <0 if error. Note that error
199 * codes can be from errno.h or -ve EC_RES_INVALID_CHECKSUM values (and they
202 static int handle_proto3_response(struct cros_ec_dev *dev,
203 uint8_t **dinp, int din_len)
205 struct ec_host_response *rs = (struct ec_host_response *)dev->din;
209 cros_ec_dump_data("in-header", -1, dev->din, sizeof(*rs));
211 /* Check input data */
212 if (rs->struct_version != EC_HOST_RESPONSE_VERSION) {
213 debug("%s: EC response version mismatch\n", __func__);
214 return -EC_RES_INVALID_RESPONSE;
218 debug("%s: EC response reserved != 0\n", __func__);
219 return -EC_RES_INVALID_RESPONSE;
222 if (rs->data_len > din_len) {
223 debug("%s: EC returned too much data\n", __func__);
224 return -EC_RES_RESPONSE_TOO_BIG;
227 cros_ec_dump_data("in-data", -1, dev->din + sizeof(*rs), rs->data_len);
229 /* Update in_bytes to actual data size */
230 in_bytes = sizeof(*rs) + rs->data_len;
232 /* Verify checksum */
233 csum = cros_ec_calc_checksum(dev->din, in_bytes);
235 debug("%s: EC response checksum invalid: 0x%02x\n", __func__,
237 return -EC_RES_INVALID_CHECKSUM;
240 /* Return error result, if any */
242 return -(int)rs->result;
244 /* If we're still here, set response data pointer and return length */
245 *dinp = (uint8_t *)(rs + 1);
250 static int send_command_proto3(struct cros_ec_dev *cdev,
251 int cmd, int cmd_version,
252 const void *dout, int dout_len,
253 uint8_t **dinp, int din_len)
255 struct dm_cros_ec_ops *ops;
256 int out_bytes, in_bytes;
259 /* Create request packet */
260 out_bytes = create_proto3_request(cdev, cmd, cmd_version,
265 /* Prepare response buffer */
266 in_bytes = prepare_proto3_response_buffer(cdev, din_len);
270 ops = dm_cros_ec_get_ops(cdev->dev);
271 rv = ops->packet ? ops->packet(cdev->dev, out_bytes, in_bytes) :
276 /* Process the response */
277 return handle_proto3_response(cdev, dinp, din_len);
280 static int send_command(struct cros_ec_dev *dev, uint cmd, int cmd_version,
281 const void *dout, int dout_len,
282 uint8_t **dinp, int din_len)
284 struct dm_cros_ec_ops *ops;
287 /* Handle protocol version 3 support */
288 if (dev->protocol_version == 3) {
289 return send_command_proto3(dev, cmd, cmd_version,
290 dout, dout_len, dinp, din_len);
293 ops = dm_cros_ec_get_ops(dev->dev);
294 ret = ops->command(dev->dev, cmd, cmd_version,
295 (const uint8_t *)dout, dout_len, dinp, din_len);
301 * Send a command to the CROS-EC device and return the reply.
303 * The device's internal input/output buffers are used.
305 * @param dev CROS-EC device
306 * @param cmd Command to send (EC_CMD_...)
307 * @param cmd_version Version of command to send (EC_VER_...)
308 * @param dout Output data (may be NULL If dout_len=0)
309 * @param dout_len Size of output data in bytes
310 * @param dinp Response data (may be NULL If din_len=0).
311 * If not NULL, it will be updated to point to the data
312 * and will always be double word aligned (64-bits)
313 * @param din_len Maximum size of response in bytes
314 * @return number of bytes in response, or -ve on error
316 static int ec_command_inptr(struct udevice *dev, uint8_t cmd,
317 int cmd_version, const void *dout, int dout_len,
318 uint8_t **dinp, int din_len)
320 struct cros_ec_dev *cdev = dev_get_uclass_priv(dev);
324 len = send_command(cdev, cmd, cmd_version, dout, dout_len, &din,
327 /* If the command doesn't complete, wait a while */
328 if (len == -EC_RES_IN_PROGRESS) {
329 struct ec_response_get_comms_status *resp = NULL;
332 /* Wait for command to complete */
333 start = get_timer(0);
337 mdelay(50); /* Insert some reasonable delay */
338 ret = send_command(cdev, EC_CMD_GET_COMMS_STATUS, 0,
340 (uint8_t **)&resp, sizeof(*resp));
344 if (get_timer(start) > CROS_EC_CMD_TIMEOUT_MS) {
345 debug("%s: Command %#02x timeout\n",
347 return -EC_RES_TIMEOUT;
349 } while (resp->flags & EC_COMMS_STATUS_PROCESSING);
351 /* OK it completed, so read the status response */
352 /* not sure why it was 0 for the last argument */
353 len = send_command(cdev, EC_CMD_RESEND_RESPONSE, 0, NULL, 0,
357 debug("%s: len=%d, din=%p\n", __func__, len, din);
359 /* If we have any data to return, it must be 64bit-aligned */
360 assert(len <= 0 || !((uintptr_t)din & 7));
368 * Send a command to the CROS-EC device and return the reply.
370 * The device's internal input/output buffers are used.
372 * @param dev CROS-EC device
373 * @param cmd Command to send (EC_CMD_...)
374 * @param cmd_version Version of command to send (EC_VER_...)
375 * @param dout Output data (may be NULL If dout_len=0)
376 * @param dout_len Size of output data in bytes
377 * @param din Response data (may be NULL If din_len=0).
378 * It not NULL, it is a place for ec_command() to copy the
380 * @param din_len Maximum size of response in bytes
381 * @return number of bytes in response, or -ve on error
383 static int ec_command(struct udevice *dev, uint cmd, int cmd_version,
384 const void *dout, int dout_len,
385 void *din, int din_len)
390 assert((din_len == 0) || din);
391 len = ec_command_inptr(dev, cmd, cmd_version, dout, dout_len,
392 &in_buffer, din_len);
395 * If we were asked to put it somewhere, do so, otherwise just
396 * disregard the result.
398 if (din && in_buffer) {
399 assert(len <= din_len);
400 memmove(din, in_buffer, len);
406 int cros_ec_scan_keyboard(struct udevice *dev, struct mbkp_keyscan *scan)
408 if (ec_command(dev, EC_CMD_MKBP_STATE, 0, NULL, 0, scan,
409 sizeof(scan->data)) != sizeof(scan->data))
415 int cros_ec_read_id(struct udevice *dev, char *id, int maxlen)
417 struct ec_response_get_version *r;
420 ret = ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0,
421 (uint8_t **)&r, sizeof(*r));
422 if (ret != sizeof(*r)) {
423 log_err("Got rc %d, expected %u\n", ret, (uint)sizeof(*r));
427 if (maxlen > (int)sizeof(r->version_string_ro))
428 maxlen = sizeof(r->version_string_ro);
430 switch (r->current_image) {
432 memcpy(id, r->version_string_ro, maxlen);
435 memcpy(id, r->version_string_rw, maxlen);
438 log_err("Invalid EC image %d\n", r->current_image);
442 id[maxlen - 1] = '\0';
446 int cros_ec_read_version(struct udevice *dev,
447 struct ec_response_get_version **versionp)
449 if (ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0,
450 (uint8_t **)versionp, sizeof(**versionp))
451 != sizeof(**versionp))
457 int cros_ec_read_build_info(struct udevice *dev, char **strp)
459 if (ec_command_inptr(dev, EC_CMD_GET_BUILD_INFO, 0, NULL, 0,
460 (uint8_t **)strp, EC_PROTO2_MAX_PARAM_SIZE) < 0)
466 int cros_ec_read_current_image(struct udevice *dev,
467 enum ec_current_image *image)
469 struct ec_response_get_version *r;
471 if (ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0,
472 (uint8_t **)&r, sizeof(*r)) != sizeof(*r))
475 *image = r->current_image;
479 static int cros_ec_wait_on_hash_done(struct udevice *dev,
480 struct ec_response_vboot_hash *hash)
482 struct ec_params_vboot_hash p;
485 start = get_timer(0);
486 while (hash->status == EC_VBOOT_HASH_STATUS_BUSY) {
487 mdelay(50); /* Insert some reasonable delay */
489 p.cmd = EC_VBOOT_HASH_GET;
490 if (ec_command(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p),
491 hash, sizeof(*hash)) < 0)
494 if (get_timer(start) > CROS_EC_CMD_HASH_TIMEOUT_MS) {
495 debug("%s: EC_VBOOT_HASH_GET timeout\n", __func__);
496 return -EC_RES_TIMEOUT;
502 int cros_ec_read_hash(struct udevice *dev, uint hash_offset,
503 struct ec_response_vboot_hash *hash)
505 struct ec_params_vboot_hash p;
508 p.cmd = EC_VBOOT_HASH_GET;
509 p.offset = hash_offset;
510 if (ec_command(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p),
511 hash, sizeof(*hash)) < 0)
514 /* If the EC is busy calculating the hash, fidget until it's done. */
515 rv = cros_ec_wait_on_hash_done(dev, hash);
519 /* If the hash is valid, we're done. Otherwise, we have to kick it off
520 * again and wait for it to complete. Note that we explicitly assume
521 * that hashing zero bytes is always wrong, even though that would
522 * produce a valid hash value. */
523 if (hash->status == EC_VBOOT_HASH_STATUS_DONE && hash->size)
526 debug("%s: No valid hash (status=%d size=%d). Compute one...\n",
527 __func__, hash->status, hash->size);
529 p.cmd = EC_VBOOT_HASH_START;
530 p.hash_type = EC_VBOOT_HASH_TYPE_SHA256;
532 p.offset = hash_offset;
534 if (ec_command(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p),
535 hash, sizeof(*hash)) < 0)
538 rv = cros_ec_wait_on_hash_done(dev, hash);
542 debug("%s: hash done\n", __func__);
547 static int cros_ec_invalidate_hash(struct udevice *dev)
549 struct ec_params_vboot_hash p;
550 struct ec_response_vboot_hash *hash;
552 /* We don't have an explict command for the EC to discard its current
553 * hash value, so we'll just tell it to calculate one that we know is
554 * wrong (we claim that hashing zero bytes is always invalid).
556 p.cmd = EC_VBOOT_HASH_RECALC;
557 p.hash_type = EC_VBOOT_HASH_TYPE_SHA256;
562 debug("%s:\n", __func__);
564 if (ec_command_inptr(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p),
565 (uint8_t **)&hash, sizeof(*hash)) < 0)
568 /* No need to wait for it to finish */
572 int cros_ec_reboot(struct udevice *dev, enum ec_reboot_cmd cmd, uint8_t flags)
574 struct ec_params_reboot_ec p;
579 if (ec_command_inptr(dev, EC_CMD_REBOOT_EC, 0, &p, sizeof(p), NULL, 0)
583 if (!(flags & EC_REBOOT_FLAG_ON_AP_SHUTDOWN)) {
585 * EC reboot will take place immediately so delay to allow it
586 * to complete. Note that some reboot types (EC_REBOOT_COLD)
587 * will reboot the AP as well, in which case we won't actually
591 * TODO(rspangler@chromium.org): Would be nice if we had a
592 * better way to determine when the reboot is complete. Could
593 * we poll a memory-mapped LPC value?
601 int cros_ec_interrupt_pending(struct udevice *dev)
603 struct cros_ec_dev *cdev = dev_get_uclass_priv(dev);
605 /* no interrupt support : always poll */
606 if (!dm_gpio_is_valid(&cdev->ec_int))
609 return dm_gpio_get_value(&cdev->ec_int);
612 int cros_ec_info(struct udevice *dev, struct ec_response_mkbp_info *info)
614 if (ec_command(dev, EC_CMD_MKBP_INFO, 0, NULL, 0, info,
615 sizeof(*info)) != sizeof(*info))
621 int cros_ec_get_event_mask(struct udevice *dev, uint type, uint32_t *mask)
623 struct ec_response_host_event_mask rsp;
626 ret = ec_command(dev, type, 0, NULL, 0, &rsp, sizeof(rsp));
629 else if (ret != sizeof(rsp))
637 int cros_ec_set_event_mask(struct udevice *dev, uint type, uint32_t mask)
639 struct ec_params_host_event_mask req;
644 ret = ec_command(dev, type, 0, &req, sizeof(req), NULL, 0);
651 int cros_ec_get_host_events(struct udevice *dev, uint32_t *events_ptr)
653 struct ec_response_host_event_mask *resp;
656 * Use the B copy of the event flags, because the main copy is already
659 if (ec_command_inptr(dev, EC_CMD_HOST_EVENT_GET_B, 0, NULL, 0,
660 (uint8_t **)&resp, sizeof(*resp)) < (int)sizeof(*resp))
663 if (resp->mask & EC_HOST_EVENT_MASK(EC_HOST_EVENT_INVALID))
666 *events_ptr = resp->mask;
670 int cros_ec_clear_host_events(struct udevice *dev, uint32_t events)
672 struct ec_params_host_event_mask params;
674 params.mask = events;
677 * Use the B copy of the event flags, so it affects the data returned
678 * by cros_ec_get_host_events().
680 if (ec_command_inptr(dev, EC_CMD_HOST_EVENT_CLEAR_B, 0,
681 ¶ms, sizeof(params), NULL, 0) < 0)
687 int cros_ec_flash_protect(struct udevice *dev, uint32_t set_mask,
689 struct ec_response_flash_protect *resp)
691 struct ec_params_flash_protect params;
693 params.mask = set_mask;
694 params.flags = set_flags;
696 if (ec_command(dev, EC_CMD_FLASH_PROTECT, EC_VER_FLASH_PROTECT,
697 ¶ms, sizeof(params),
698 resp, sizeof(*resp)) != sizeof(*resp))
704 int cros_ec_entering_mode(struct udevice *dev, int mode)
708 rc = ec_command(dev, EC_CMD_ENTERING_MODE, 0, &mode, sizeof(mode),
715 static int cros_ec_check_version(struct udevice *dev)
717 struct cros_ec_dev *cdev = dev_get_uclass_priv(dev);
718 struct ec_params_hello req;
719 struct ec_response_hello *resp;
721 struct dm_cros_ec_ops *ops;
724 ops = dm_cros_ec_get_ops(dev);
725 if (ops->check_version) {
726 ret = ops->check_version(dev);
732 * TODO(sjg@chromium.org).
733 * There is a strange oddity here with the EC. We could just ignore
734 * the response, i.e. pass the last two parameters as NULL and 0.
735 * In this case we won't read back very many bytes from the EC.
736 * On the I2C bus the EC gets upset about this and will try to send
737 * the bytes anyway. This means that we will have to wait for that
738 * to complete before continuing with a new EC command.
740 * This problem is probably unique to the I2C bus.
742 * So for now, just read all the data anyway.
745 /* Try sending a version 3 packet */
746 cdev->protocol_version = 3;
748 if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req),
749 (uint8_t **)&resp, sizeof(*resp)) > 0)
752 /* Try sending a version 2 packet */
753 cdev->protocol_version = 2;
754 if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req),
755 (uint8_t **)&resp, sizeof(*resp)) > 0)
759 * Fail if we're still here, since the EC doesn't understand any
760 * protcol version we speak. Version 1 interface without command
761 * version is no longer supported, and we don't know about any new
764 cdev->protocol_version = 0;
765 printf("%s: ERROR: old EC interface not supported\n", __func__);
769 int cros_ec_test(struct udevice *dev)
771 struct ec_params_hello req;
772 struct ec_response_hello *resp;
774 req.in_data = 0x12345678;
775 if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req),
776 (uint8_t **)&resp, sizeof(*resp)) < sizeof(*resp)) {
777 printf("ec_command_inptr() returned error\n");
780 if (resp->out_data != req.in_data + 0x01020304) {
781 printf("Received invalid handshake %x\n", resp->out_data);
788 int cros_ec_flash_offset(struct udevice *dev, enum ec_flash_region region,
789 uint32_t *offset, uint32_t *size)
791 struct ec_params_flash_region_info p;
792 struct ec_response_flash_region_info *r;
796 ret = ec_command_inptr(dev, EC_CMD_FLASH_REGION_INFO,
797 EC_VER_FLASH_REGION_INFO,
798 &p, sizeof(p), (uint8_t **)&r, sizeof(*r));
799 if (ret != sizeof(*r))
810 int cros_ec_flash_erase(struct udevice *dev, uint32_t offset, uint32_t size)
812 struct ec_params_flash_erase p;
816 return ec_command_inptr(dev, EC_CMD_FLASH_ERASE, 0, &p, sizeof(p),
821 * Write a single block to the flash
823 * Write a block of data to the EC flash. The size must not exceed the flash
824 * write block size which you can obtain from cros_ec_flash_write_burst_size().
826 * The offset starts at 0. You can obtain the region information from
827 * cros_ec_flash_offset() to find out where to write for a particular region.
829 * Attempting to write to the region where the EC is currently running from
830 * will result in an error.
832 * @param dev CROS-EC device
833 * @param data Pointer to data buffer to write
834 * @param offset Offset within flash to write to.
835 * @param size Number of bytes to write
836 * @return 0 if ok, -1 on error
838 static int cros_ec_flash_write_block(struct udevice *dev, const uint8_t *data,
839 uint32_t offset, uint32_t size)
841 struct ec_params_flash_write *p;
844 p = malloc(sizeof(*p) + size);
850 assert(data && p->size <= EC_FLASH_WRITE_VER0_SIZE);
851 memcpy(p + 1, data, p->size);
853 ret = ec_command_inptr(dev, EC_CMD_FLASH_WRITE, 0,
854 p, sizeof(*p) + size, NULL, 0) >= 0 ? 0 : -1;
862 * Return optimal flash write burst size
864 static int cros_ec_flash_write_burst_size(struct udevice *dev)
866 return EC_FLASH_WRITE_VER0_SIZE;
870 * Check if a block of data is erased (all 0xff)
872 * This function is useful when dealing with flash, for checking whether a
873 * data block is erased and thus does not need to be programmed.
875 * @param data Pointer to data to check (must be word-aligned)
876 * @param size Number of bytes to check (must be word-aligned)
877 * @return 0 if erased, non-zero if any word is not erased
879 static int cros_ec_data_is_erased(const uint32_t *data, int size)
882 size /= sizeof(uint32_t);
883 for (; size > 0; size -= 4, data++)
891 * Read back flash parameters
893 * This function reads back parameters of the flash as reported by the EC
895 * @param dev Pointer to device
896 * @param info Pointer to output flash info struct
898 int cros_ec_read_flashinfo(struct udevice *dev,
899 struct ec_response_flash_info *info)
903 ret = ec_command(dev, EC_CMD_FLASH_INFO, 0,
904 NULL, 0, info, sizeof(*info));
908 return ret < sizeof(*info) ? -1 : 0;
911 int cros_ec_flash_write(struct udevice *dev, const uint8_t *data,
912 uint32_t offset, uint32_t size)
914 struct cros_ec_dev *cdev = dev_get_uclass_priv(dev);
915 uint32_t burst = cros_ec_flash_write_burst_size(dev);
923 * TODO: round up to the nearest multiple of write size. Can get away
924 * without that on link right now because its write size is 4 bytes.
927 for (off = offset; off < end; off += burst, data += burst) {
930 /* If the data is empty, there is no point in programming it */
931 todo = min(end - off, burst);
932 if (cdev->optimise_flash_write &&
933 cros_ec_data_is_erased((uint32_t *)data, todo))
936 ret = cros_ec_flash_write_block(dev, data, off, todo);
945 * Run verification on a slot
947 * @param me CrosEc instance
948 * @param region Region to run verification on
949 * @return 0 if success or not applicable. Non-zero if verification failed.
951 int cros_ec_efs_verify(struct udevice *dev, enum ec_flash_region region)
953 struct ec_params_efs_verify p;
956 log_info("EFS: EC is verifying updated image...\n");
959 rv = ec_command(dev, EC_CMD_EFS_VERIFY, 0, &p, sizeof(p), NULL, 0);
961 log_info("EFS: Verification success\n");
964 if (rv == -EC_RES_INVALID_COMMAND) {
965 log_info("EFS: EC doesn't support EFS_VERIFY command\n");
968 log_info("EFS: Verification failed\n");
974 * Read a single block from the flash
976 * Read a block of data from the EC flash. The size must not exceed the flash
977 * write block size which you can obtain from cros_ec_flash_write_burst_size().
979 * The offset starts at 0. You can obtain the region information from
980 * cros_ec_flash_offset() to find out where to read for a particular region.
982 * @param dev CROS-EC device
983 * @param data Pointer to data buffer to read into
984 * @param offset Offset within flash to read from
985 * @param size Number of bytes to read
986 * @return 0 if ok, -1 on error
988 static int cros_ec_flash_read_block(struct udevice *dev, uint8_t *data,
989 uint32_t offset, uint32_t size)
991 struct ec_params_flash_read p;
996 return ec_command(dev, EC_CMD_FLASH_READ, 0,
997 &p, sizeof(p), data, size) >= 0 ? 0 : -1;
1000 int cros_ec_flash_read(struct udevice *dev, uint8_t *data, uint32_t offset,
1003 uint32_t burst = cros_ec_flash_write_burst_size(dev);
1007 end = offset + size;
1008 for (off = offset; off < end; off += burst, data += burst) {
1009 ret = cros_ec_flash_read_block(dev, data, off,
1010 min(end - off, burst));
1018 int cros_ec_flash_update_rw(struct udevice *dev, const uint8_t *image,
1021 uint32_t rw_offset, rw_size;
1024 if (cros_ec_flash_offset(dev, EC_FLASH_REGION_ACTIVE, &rw_offset,
1027 if (image_size > (int)rw_size)
1030 /* Invalidate the existing hash, just in case the AP reboots
1031 * unexpectedly during the update. If that happened, the EC RW firmware
1032 * would be invalid, but the EC would still have the original hash.
1034 ret = cros_ec_invalidate_hash(dev);
1039 * Erase the entire RW section, so that the EC doesn't see any garbage
1040 * past the new image if it's smaller than the current image.
1042 * TODO: could optimize this to erase just the current image, since
1043 * presumably everything past that is 0xff's. But would still need to
1044 * round up to the nearest multiple of erase size.
1046 ret = cros_ec_flash_erase(dev, rw_offset, rw_size);
1050 /* Write the image */
1051 ret = cros_ec_flash_write(dev, image, rw_offset, image_size);
1058 int cros_ec_read_nvdata(struct udevice *dev, uint8_t *block, int size)
1060 struct ec_params_vbnvcontext p;
1063 if (size != EC_VBNV_BLOCK_SIZE && size != EC_VBNV_BLOCK_SIZE_V2)
1066 p.op = EC_VBNV_CONTEXT_OP_READ;
1068 len = ec_command(dev, EC_CMD_VBNV_CONTEXT, EC_VER_VBNV_CONTEXT,
1069 &p, sizeof(uint32_t) + size, block, size);
1071 log_err("Expected %d bytes, got %d\n", size, len);
1078 int cros_ec_write_nvdata(struct udevice *dev, const uint8_t *block, int size)
1080 struct ec_params_vbnvcontext p;
1083 if (size != EC_VBNV_BLOCK_SIZE && size != EC_VBNV_BLOCK_SIZE_V2)
1085 p.op = EC_VBNV_CONTEXT_OP_WRITE;
1086 memcpy(p.block, block, size);
1088 len = ec_command_inptr(dev, EC_CMD_VBNV_CONTEXT, EC_VER_VBNV_CONTEXT,
1089 &p, sizeof(uint32_t) + size, NULL, 0);
1096 int cros_ec_battery_cutoff(struct udevice *dev, uint8_t flags)
1098 struct ec_params_battery_cutoff p;
1102 len = ec_command(dev, EC_CMD_BATTERY_CUT_OFF, 1, &p, sizeof(p),
1110 int cros_ec_set_ldo(struct udevice *dev, uint8_t index, uint8_t state)
1112 struct ec_params_ldo_set params;
1114 params.index = index;
1115 params.state = state;
1117 if (ec_command_inptr(dev, EC_CMD_LDO_SET, 0, ¶ms, sizeof(params),
1124 int cros_ec_get_ldo(struct udevice *dev, uint8_t index, uint8_t *state)
1126 struct ec_params_ldo_get params;
1127 struct ec_response_ldo_get *resp;
1129 params.index = index;
1131 if (ec_command_inptr(dev, EC_CMD_LDO_GET, 0, ¶ms, sizeof(params),
1132 (uint8_t **)&resp, sizeof(*resp)) !=
1136 *state = resp->state;
1141 int cros_ec_register(struct udevice *dev)
1143 struct cros_ec_dev *cdev = dev_get_uclass_priv(dev);
1147 gpio_request_by_name(dev, "ec-interrupt", 0, &cdev->ec_int,
1149 cdev->optimise_flash_write = dev_read_bool(dev, "optimise-flash-write");
1151 if (cros_ec_check_version(dev)) {
1152 debug("%s: Could not detect CROS-EC version\n", __func__);
1153 return -CROS_EC_ERR_CHECK_VERSION;
1156 if (cros_ec_read_id(dev, id, sizeof(id))) {
1157 debug("%s: Could not read KBC ID\n", __func__);
1158 return -CROS_EC_ERR_READ_ID;
1161 /* Remember this device for use by the cros_ec command */
1162 debug("Google Chrome EC v%d CROS-EC driver ready, id '%s'\n",
1163 cdev->protocol_version, id);
1168 int cros_ec_decode_ec_flash(struct udevice *dev, struct fdt_cros_ec *config)
1170 ofnode flash_node, node;
1172 flash_node = dev_read_subnode(dev, "flash");
1173 if (!ofnode_valid(flash_node)) {
1174 debug("Failed to find flash node\n");
1178 if (ofnode_read_fmap_entry(flash_node, &config->flash)) {
1179 debug("Failed to decode flash node in chrome-ec\n");
1183 config->flash_erase_value = ofnode_read_s32_default(flash_node,
1185 ofnode_for_each_subnode(node, flash_node) {
1186 const char *name = ofnode_get_name(node);
1187 enum ec_flash_region region;
1189 if (0 == strcmp(name, "ro")) {
1190 region = EC_FLASH_REGION_RO;
1191 } else if (0 == strcmp(name, "rw")) {
1192 region = EC_FLASH_REGION_ACTIVE;
1193 } else if (0 == strcmp(name, "wp-ro")) {
1194 region = EC_FLASH_REGION_WP_RO;
1196 debug("Unknown EC flash region name '%s'\n", name);
1200 if (ofnode_read_fmap_entry(node, &config->region[region])) {
1201 debug("Failed to decode flash region in chrome-ec'\n");
1209 int cros_ec_i2c_tunnel(struct udevice *dev, int port, struct i2c_msg *in,
1213 struct ec_params_i2c_passthru p;
1214 uint8_t outbuf[EC_PROTO2_MAX_PARAM_SIZE];
1217 struct ec_response_i2c_passthru r;
1218 uint8_t inbuf[EC_PROTO2_MAX_PARAM_SIZE];
1220 struct ec_params_i2c_passthru *p = ¶ms.p;
1221 struct ec_response_i2c_passthru *r = &response.r;
1222 struct ec_params_i2c_passthru_msg *msg;
1223 uint8_t *pdata, *read_ptr = NULL;
1231 p->num_msgs = nmsgs;
1232 size = sizeof(*p) + p->num_msgs * sizeof(*msg);
1234 /* Create a message to write the register address and optional data */
1235 pdata = (uint8_t *)p + size;
1238 for (i = 0, msg = p->msg; i < nmsgs; i++, msg++, in++) {
1239 bool is_read = in->flags & I2C_M_RD;
1241 msg->addr_flags = in->addr;
1244 msg->addr_flags |= EC_I2C_FLAG_READ;
1245 read_len += in->len;
1247 if (sizeof(*r) + read_len > sizeof(response)) {
1248 puts("Read length too big for buffer\n");
1252 if (pdata - (uint8_t *)p + in->len > sizeof(params)) {
1253 puts("Params too large for buffer\n");
1256 memcpy(pdata, in->buf, in->len);
1261 rv = ec_command(dev, EC_CMD_I2C_PASSTHRU, 0, p, pdata - (uint8_t *)p,
1262 r, sizeof(*r) + read_len);
1266 /* Parse response */
1267 if (r->i2c_status & EC_I2C_STATUS_ERROR) {
1268 printf("Transfer failed with status=0x%x\n", r->i2c_status);
1272 if (rv < sizeof(*r) + read_len) {
1273 puts("Truncated read response\n");
1277 /* We only support a single read message for each transfer */
1279 memcpy(read_ptr, r->data, read_len);
1284 int cros_ec_check_feature(struct udevice *dev, int feature)
1286 struct ec_response_get_features r;
1289 rv = ec_command(dev, EC_CMD_GET_FEATURES, 0, &r, sizeof(r), NULL, 0);
1293 if (feature >= 8 * sizeof(r.flags))
1296 return r.flags[feature / 32] & EC_FEATURE_MASK_0(feature);
1300 * Query the EC for specified mask indicating enabled events.
1301 * The EC maintains separate event masks for SMI, SCI and WAKE.
1303 static int cros_ec_uhepi_cmd(struct udevice *dev, uint mask, uint action,
1307 struct ec_params_host_event req;
1308 struct ec_response_host_event rsp;
1310 req.action = action;
1311 req.mask_type = mask;
1312 if (action != EC_HOST_EVENT_GET)
1316 ret = ec_command(dev, EC_CMD_HOST_EVENT, 0, &req, sizeof(req), &rsp,
1319 if (action != EC_HOST_EVENT_GET)
1327 static int cros_ec_handle_non_uhepi_cmd(struct udevice *dev, uint hcmd,
1328 uint action, uint64_t *value)
1331 struct ec_params_host_event_mask req;
1332 struct ec_response_host_event_mask rsp;
1334 if (hcmd == INVALID_HCMD)
1337 if (action != EC_HOST_EVENT_GET)
1338 req.mask = (uint32_t)*value;
1342 ret = ec_command(dev, hcmd, 0, &req, sizeof(req), &rsp, sizeof(rsp));
1343 if (action != EC_HOST_EVENT_GET)
1351 bool cros_ec_is_uhepi_supported(struct udevice *dev)
1353 #define UHEPI_SUPPORTED 1
1354 #define UHEPI_NOT_SUPPORTED 2
1355 static int uhepi_support;
1357 if (!uhepi_support) {
1358 uhepi_support = cros_ec_check_feature(dev,
1359 EC_FEATURE_UNIFIED_WAKE_MASKS) > 0 ? UHEPI_SUPPORTED :
1360 UHEPI_NOT_SUPPORTED;
1361 log_debug("Chrome EC: UHEPI %s\n",
1362 uhepi_support == UHEPI_SUPPORTED ? "supported" :
1365 return uhepi_support == UHEPI_SUPPORTED;
1368 static int cros_ec_get_mask(struct udevice *dev, uint type)
1372 if (cros_ec_is_uhepi_supported(dev)) {
1373 cros_ec_uhepi_cmd(dev, type, EC_HOST_EVENT_GET, &value);
1375 assert(type < ARRAY_SIZE(event_map));
1376 cros_ec_handle_non_uhepi_cmd(dev, event_map[type].get_cmd,
1377 EC_HOST_EVENT_GET, &value);
1382 static int cros_ec_clear_mask(struct udevice *dev, uint type, u64 mask)
1384 if (cros_ec_is_uhepi_supported(dev))
1385 return cros_ec_uhepi_cmd(dev, type, EC_HOST_EVENT_CLEAR, &mask);
1387 assert(type < ARRAY_SIZE(event_map));
1389 return cros_ec_handle_non_uhepi_cmd(dev, event_map[type].clear_cmd,
1390 EC_HOST_EVENT_CLEAR, &mask);
1393 uint64_t cros_ec_get_events_b(struct udevice *dev)
1395 return cros_ec_get_mask(dev, EC_HOST_EVENT_B);
1398 int cros_ec_clear_events_b(struct udevice *dev, uint64_t mask)
1400 log_debug("Chrome EC: clear events_b mask to 0x%016llx\n", mask);
1402 return cros_ec_clear_mask(dev, EC_HOST_EVENT_B, mask);
1405 int cros_ec_read_limit_power(struct udevice *dev, int *limit_powerp)
1407 struct ec_params_charge_state p;
1408 struct ec_response_charge_state r;
1411 p.cmd = CHARGE_STATE_CMD_GET_PARAM;
1412 p.get_param.param = CS_PARAM_LIMIT_POWER;
1413 ret = ec_command(dev, EC_CMD_CHARGE_STATE, 0, &p, sizeof(p),
1417 * If our EC doesn't support the LIMIT_POWER parameter, assume that
1418 * LIMIT_POWER is not requested.
1420 if (ret == -EC_RES_INVALID_PARAM || ret == -EC_RES_INVALID_COMMAND) {
1421 log_warning("PARAM_LIMIT_POWER not supported by EC\n");
1425 if (ret != sizeof(r.get_param))
1428 *limit_powerp = r.get_param.value;
1432 int cros_ec_config_powerbtn(struct udevice *dev, uint32_t flags)
1434 struct ec_params_config_power_button params;
1437 params.flags = flags;
1438 ret = ec_command(dev, EC_CMD_CONFIG_POWER_BUTTON, 0,
1439 ¶ms, sizeof(params), NULL, 0);
1446 int cros_ec_get_lid_shutdown_mask(struct udevice *dev)
1451 ret = cros_ec_get_event_mask(dev, EC_CMD_HOST_EVENT_GET_SMI_MASK,
1456 return !!(mask & EC_HOST_EVENT_MASK(EC_HOST_EVENT_LID_CLOSED));
1459 int cros_ec_set_lid_shutdown_mask(struct udevice *dev, int enable)
1464 ret = cros_ec_get_event_mask(dev, EC_CMD_HOST_EVENT_GET_SMI_MASK,
1469 /* Set lid close event state in the EC SMI event mask */
1471 mask |= EC_HOST_EVENT_MASK(EC_HOST_EVENT_LID_CLOSED);
1473 mask &= ~EC_HOST_EVENT_MASK(EC_HOST_EVENT_LID_CLOSED);
1475 ret = cros_ec_set_event_mask(dev, EC_CMD_HOST_EVENT_SET_SMI_MASK, mask);
1479 printf("EC: %sabled lid close event\n", enable ? "en" : "dis");
1483 UCLASS_DRIVER(cros_ec) = {
1484 .id = UCLASS_CROS_EC,
1486 .per_device_auto_alloc_size = sizeof(struct cros_ec_dev),
1487 .post_bind = dm_scan_fdt_dev,
1488 .flags = DM_UC_FLAG_ALLOC_PRIV_DMA,