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
28 #include <linux/delay.h>
29 #include <linux/errno.h>
31 #include <asm-generic/gpio.h>
32 #include <dm/device-internal.h>
33 #include <dm/of_extra.h>
34 #include <dm/uclass-internal.h>
37 #define debug_trace(fmt, b...) debug(fmt, #b)
39 #define debug_trace(fmt, b...)
43 /* Timeout waiting for a flash erase command to complete */
44 CROS_EC_CMD_TIMEOUT_MS = 5000,
45 /* Timeout waiting for a synchronous hash to be recomputed */
46 CROS_EC_CMD_HASH_TIMEOUT_MS = 2000,
49 #define INVALID_HCMD 0xFF
52 * Map UHEPI masks to non UHEPI commands in order to support old EC FW
53 * which does not support UHEPI command.
60 [EC_HOST_EVENT_MAIN] = {
61 INVALID_HCMD, EC_CMD_HOST_EVENT_CLEAR,
65 INVALID_HCMD, EC_CMD_HOST_EVENT_CLEAR_B,
66 EC_CMD_HOST_EVENT_GET_B,
68 [EC_HOST_EVENT_SCI_MASK] = {
69 EC_CMD_HOST_EVENT_SET_SCI_MASK, INVALID_HCMD,
70 EC_CMD_HOST_EVENT_GET_SCI_MASK,
72 [EC_HOST_EVENT_SMI_MASK] = {
73 EC_CMD_HOST_EVENT_SET_SMI_MASK, INVALID_HCMD,
74 EC_CMD_HOST_EVENT_GET_SMI_MASK,
76 [EC_HOST_EVENT_ALWAYS_REPORT_MASK] = {
77 INVALID_HCMD, INVALID_HCMD, INVALID_HCMD,
79 [EC_HOST_EVENT_ACTIVE_WAKE_MASK] = {
80 EC_CMD_HOST_EVENT_SET_WAKE_MASK, INVALID_HCMD,
81 EC_CMD_HOST_EVENT_GET_WAKE_MASK,
83 [EC_HOST_EVENT_LAZY_WAKE_MASK_S0IX] = {
84 EC_CMD_HOST_EVENT_SET_WAKE_MASK, INVALID_HCMD,
85 EC_CMD_HOST_EVENT_GET_WAKE_MASK,
87 [EC_HOST_EVENT_LAZY_WAKE_MASK_S3] = {
88 EC_CMD_HOST_EVENT_SET_WAKE_MASK, INVALID_HCMD,
89 EC_CMD_HOST_EVENT_GET_WAKE_MASK,
91 [EC_HOST_EVENT_LAZY_WAKE_MASK_S5] = {
92 EC_CMD_HOST_EVENT_SET_WAKE_MASK, INVALID_HCMD,
93 EC_CMD_HOST_EVENT_GET_WAKE_MASK,
97 void cros_ec_dump_data(const char *name, int cmd, const uint8_t *data, int len)
102 printf("%s: ", name);
104 printf("cmd=%#x: ", cmd);
105 for (i = 0; i < len; i++)
106 printf("%02x ", data[i]);
112 * Calculate a simple 8-bit checksum of a data block
114 * @param data Data block to checksum
115 * @param size Size of data block in bytes
116 * @return checksum value (0 to 255)
118 int cros_ec_calc_checksum(const uint8_t *data, int size)
122 for (i = csum = 0; i < size; i++)
128 * Create a request packet for protocol version 3.
130 * The packet is stored in the device's internal output buffer.
132 * @param dev CROS-EC device
133 * @param cmd Command to send (EC_CMD_...)
134 * @param cmd_version Version of command to send (EC_VER_...)
135 * @param dout Output data (may be NULL If dout_len=0)
136 * @param dout_len Size of output data in bytes
137 * @return packet size in bytes, or <0 if error.
139 static int create_proto3_request(struct cros_ec_dev *cdev,
140 int cmd, int cmd_version,
141 const void *dout, int dout_len)
143 struct ec_host_request *rq = (struct ec_host_request *)cdev->dout;
144 int out_bytes = dout_len + sizeof(*rq);
146 /* Fail if output size is too big */
147 if (out_bytes > (int)sizeof(cdev->dout)) {
148 debug("%s: Cannot send %d bytes\n", __func__, dout_len);
149 return -EC_RES_REQUEST_TRUNCATED;
152 /* Fill in request packet */
153 rq->struct_version = EC_HOST_REQUEST_VERSION;
156 rq->command_version = cmd_version;
158 rq->data_len = dout_len;
160 /* Copy data after header */
161 memcpy(rq + 1, dout, dout_len);
163 /* Write checksum field so the entire packet sums to 0 */
164 rq->checksum = (uint8_t)(-cros_ec_calc_checksum(cdev->dout, out_bytes));
166 cros_ec_dump_data("out", cmd, cdev->dout, out_bytes);
168 /* Return size of request packet */
173 * Prepare the device to receive a protocol version 3 response.
175 * @param dev CROS-EC device
176 * @param din_len Maximum size of response in bytes
177 * @return maximum expected number of bytes in response, or <0 if error.
179 static int prepare_proto3_response_buffer(struct cros_ec_dev *cdev, int din_len)
181 int in_bytes = din_len + sizeof(struct ec_host_response);
183 /* Fail if input size is too big */
184 if (in_bytes > (int)sizeof(cdev->din)) {
185 debug("%s: Cannot receive %d bytes\n", __func__, din_len);
186 return -EC_RES_RESPONSE_TOO_BIG;
189 /* Return expected size of response packet */
194 * Handle a protocol version 3 response packet.
196 * The packet must already be stored in the device's internal input buffer.
198 * @param dev CROS-EC device
199 * @param dinp Returns pointer to response data
200 * @param din_len Maximum size of response in bytes
201 * @return number of bytes of response data, or <0 if error. Note that error
202 * codes can be from errno.h or -ve EC_RES_INVALID_CHECKSUM values (and they
205 static int handle_proto3_response(struct cros_ec_dev *dev,
206 uint8_t **dinp, int din_len)
208 struct ec_host_response *rs = (struct ec_host_response *)dev->din;
212 cros_ec_dump_data("in-header", -1, dev->din, sizeof(*rs));
214 /* Check input data */
215 if (rs->struct_version != EC_HOST_RESPONSE_VERSION) {
216 debug("%s: EC response version mismatch\n", __func__);
217 return -EC_RES_INVALID_RESPONSE;
221 debug("%s: EC response reserved != 0\n", __func__);
222 return -EC_RES_INVALID_RESPONSE;
225 if (rs->data_len > din_len) {
226 debug("%s: EC returned too much data\n", __func__);
227 return -EC_RES_RESPONSE_TOO_BIG;
230 cros_ec_dump_data("in-data", -1, dev->din + sizeof(*rs), rs->data_len);
232 /* Update in_bytes to actual data size */
233 in_bytes = sizeof(*rs) + rs->data_len;
235 /* Verify checksum */
236 csum = cros_ec_calc_checksum(dev->din, in_bytes);
238 debug("%s: EC response checksum invalid: 0x%02x\n", __func__,
240 return -EC_RES_INVALID_CHECKSUM;
243 /* Return error result, if any */
245 return -(int)rs->result;
247 /* If we're still here, set response data pointer and return length */
248 *dinp = (uint8_t *)(rs + 1);
253 static int send_command_proto3(struct cros_ec_dev *cdev,
254 int cmd, int cmd_version,
255 const void *dout, int dout_len,
256 uint8_t **dinp, int din_len)
258 struct dm_cros_ec_ops *ops;
259 int out_bytes, in_bytes;
262 /* Create request packet */
263 out_bytes = create_proto3_request(cdev, cmd, cmd_version,
268 /* Prepare response buffer */
269 in_bytes = prepare_proto3_response_buffer(cdev, din_len);
273 ops = dm_cros_ec_get_ops(cdev->dev);
274 rv = ops->packet ? ops->packet(cdev->dev, out_bytes, in_bytes) :
279 /* Process the response */
280 return handle_proto3_response(cdev, dinp, din_len);
283 static int send_command(struct cros_ec_dev *dev, uint cmd, int cmd_version,
284 const void *dout, int dout_len,
285 uint8_t **dinp, int din_len)
287 struct dm_cros_ec_ops *ops;
290 /* Handle protocol version 3 support */
291 if (dev->protocol_version == 3) {
292 return send_command_proto3(dev, cmd, cmd_version,
293 dout, dout_len, dinp, din_len);
296 ops = dm_cros_ec_get_ops(dev->dev);
297 ret = ops->command(dev->dev, cmd, cmd_version,
298 (const uint8_t *)dout, dout_len, dinp, din_len);
304 * Send a command to the CROS-EC device and return the reply.
306 * The device's internal input/output buffers are used.
308 * @param dev CROS-EC device
309 * @param cmd Command to send (EC_CMD_...)
310 * @param cmd_version Version of command to send (EC_VER_...)
311 * @param dout Output data (may be NULL If dout_len=0)
312 * @param dout_len Size of output data in bytes
313 * @param dinp Response data (may be NULL If din_len=0).
314 * If not NULL, it will be updated to point to the data
315 * and will always be double word aligned (64-bits)
316 * @param din_len Maximum size of response in bytes
317 * @return number of bytes in response, or -ve on error
319 static int ec_command_inptr(struct udevice *dev, uint cmd,
320 int cmd_version, const void *dout, int dout_len,
321 uint8_t **dinp, int din_len)
323 struct cros_ec_dev *cdev = dev_get_uclass_priv(dev);
327 len = send_command(cdev, cmd, cmd_version, dout, dout_len, &din,
330 /* If the command doesn't complete, wait a while */
331 if (len == -EC_RES_IN_PROGRESS) {
332 struct ec_response_get_comms_status *resp = NULL;
335 /* Wait for command to complete */
336 start = get_timer(0);
340 mdelay(50); /* Insert some reasonable delay */
341 ret = send_command(cdev, EC_CMD_GET_COMMS_STATUS, 0,
343 (uint8_t **)&resp, sizeof(*resp));
347 if (get_timer(start) > CROS_EC_CMD_TIMEOUT_MS) {
348 debug("%s: Command %#02x timeout\n",
350 return -EC_RES_TIMEOUT;
352 } while (resp->flags & EC_COMMS_STATUS_PROCESSING);
354 /* OK it completed, so read the status response */
355 /* not sure why it was 0 for the last argument */
356 len = send_command(cdev, EC_CMD_RESEND_RESPONSE, 0, NULL, 0,
360 debug("%s: len=%d, din=%p\n", __func__, len, din);
362 /* If we have any data to return, it must be 64bit-aligned */
363 assert(len <= 0 || !((uintptr_t)din & 7));
371 * Send a command to the CROS-EC device and return the reply.
373 * The device's internal input/output buffers are used.
375 * @param dev CROS-EC device
376 * @param cmd Command to send (EC_CMD_...)
377 * @param cmd_version Version of command to send (EC_VER_...)
378 * @param dout Output data (may be NULL If dout_len=0)
379 * @param dout_len Size of output data in bytes
380 * @param din Response data (may be NULL If din_len=0).
381 * It not NULL, it is a place for ec_command() to copy the
383 * @param din_len Maximum size of response in bytes
384 * @return number of bytes in response, or -ve on error
386 static int ec_command(struct udevice *dev, uint cmd, int cmd_version,
387 const void *dout, int dout_len,
388 void *din, int din_len)
393 assert((din_len == 0) || din);
394 len = ec_command_inptr(dev, cmd, cmd_version, dout, dout_len,
395 &in_buffer, din_len);
398 * If we were asked to put it somewhere, do so, otherwise just
399 * disregard the result.
401 if (din && in_buffer) {
402 assert(len <= din_len);
403 memmove(din, in_buffer, len);
409 int cros_ec_scan_keyboard(struct udevice *dev, struct mbkp_keyscan *scan)
411 if (ec_command(dev, EC_CMD_MKBP_STATE, 0, NULL, 0, scan,
412 sizeof(scan->data)) != sizeof(scan->data))
418 int cros_ec_read_id(struct udevice *dev, char *id, int maxlen)
420 struct ec_response_get_version *r;
423 ret = ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0,
424 (uint8_t **)&r, sizeof(*r));
425 if (ret != sizeof(*r)) {
426 log_err("Got rc %d, expected %u\n", ret, (uint)sizeof(*r));
430 if (maxlen > (int)sizeof(r->version_string_ro))
431 maxlen = sizeof(r->version_string_ro);
433 switch (r->current_image) {
435 memcpy(id, r->version_string_ro, maxlen);
438 memcpy(id, r->version_string_rw, maxlen);
441 log_err("Invalid EC image %d\n", r->current_image);
445 id[maxlen - 1] = '\0';
449 int cros_ec_read_version(struct udevice *dev,
450 struct ec_response_get_version **versionp)
452 if (ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0,
453 (uint8_t **)versionp, sizeof(**versionp))
454 != sizeof(**versionp))
460 int cros_ec_read_build_info(struct udevice *dev, char **strp)
462 if (ec_command_inptr(dev, EC_CMD_GET_BUILD_INFO, 0, NULL, 0,
463 (uint8_t **)strp, EC_PROTO2_MAX_PARAM_SIZE) < 0)
469 int cros_ec_read_current_image(struct udevice *dev,
470 enum ec_current_image *image)
472 struct ec_response_get_version *r;
474 if (ec_command_inptr(dev, EC_CMD_GET_VERSION, 0, NULL, 0,
475 (uint8_t **)&r, sizeof(*r)) != sizeof(*r))
478 *image = r->current_image;
482 static int cros_ec_wait_on_hash_done(struct udevice *dev,
483 struct ec_response_vboot_hash *hash)
485 struct ec_params_vboot_hash p;
488 start = get_timer(0);
489 while (hash->status == EC_VBOOT_HASH_STATUS_BUSY) {
490 mdelay(50); /* Insert some reasonable delay */
492 p.cmd = EC_VBOOT_HASH_GET;
493 if (ec_command(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p),
494 hash, sizeof(*hash)) < 0)
497 if (get_timer(start) > CROS_EC_CMD_HASH_TIMEOUT_MS) {
498 debug("%s: EC_VBOOT_HASH_GET timeout\n", __func__);
499 return -EC_RES_TIMEOUT;
505 int cros_ec_read_hash(struct udevice *dev, uint hash_offset,
506 struct ec_response_vboot_hash *hash)
508 struct ec_params_vboot_hash p;
511 p.cmd = EC_VBOOT_HASH_GET;
512 p.offset = hash_offset;
513 if (ec_command(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p),
514 hash, sizeof(*hash)) < 0)
517 /* If the EC is busy calculating the hash, fidget until it's done. */
518 rv = cros_ec_wait_on_hash_done(dev, hash);
522 /* If the hash is valid, we're done. Otherwise, we have to kick it off
523 * again and wait for it to complete. Note that we explicitly assume
524 * that hashing zero bytes is always wrong, even though that would
525 * produce a valid hash value. */
526 if (hash->status == EC_VBOOT_HASH_STATUS_DONE && hash->size)
529 debug("%s: No valid hash (status=%d size=%d). Compute one...\n",
530 __func__, hash->status, hash->size);
532 p.cmd = EC_VBOOT_HASH_START;
533 p.hash_type = EC_VBOOT_HASH_TYPE_SHA256;
535 p.offset = hash_offset;
537 if (ec_command(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p),
538 hash, sizeof(*hash)) < 0)
541 rv = cros_ec_wait_on_hash_done(dev, hash);
545 debug("%s: hash done\n", __func__);
550 static int cros_ec_invalidate_hash(struct udevice *dev)
552 struct ec_params_vboot_hash p;
553 struct ec_response_vboot_hash *hash;
555 /* We don't have an explict command for the EC to discard its current
556 * hash value, so we'll just tell it to calculate one that we know is
557 * wrong (we claim that hashing zero bytes is always invalid).
559 p.cmd = EC_VBOOT_HASH_RECALC;
560 p.hash_type = EC_VBOOT_HASH_TYPE_SHA256;
565 debug("%s:\n", __func__);
567 if (ec_command_inptr(dev, EC_CMD_VBOOT_HASH, 0, &p, sizeof(p),
568 (uint8_t **)&hash, sizeof(*hash)) < 0)
571 /* No need to wait for it to finish */
575 int cros_ec_reboot(struct udevice *dev, enum ec_reboot_cmd cmd, uint8_t flags)
577 struct ec_params_reboot_ec p;
582 if (ec_command_inptr(dev, EC_CMD_REBOOT_EC, 0, &p, sizeof(p), NULL, 0)
586 if (!(flags & EC_REBOOT_FLAG_ON_AP_SHUTDOWN)) {
588 * EC reboot will take place immediately so delay to allow it
589 * to complete. Note that some reboot types (EC_REBOOT_COLD)
590 * will reboot the AP as well, in which case we won't actually
594 * TODO(rspangler@chromium.org): Would be nice if we had a
595 * better way to determine when the reboot is complete. Could
596 * we poll a memory-mapped LPC value?
604 int cros_ec_interrupt_pending(struct udevice *dev)
606 struct cros_ec_dev *cdev = dev_get_uclass_priv(dev);
608 /* no interrupt support : always poll */
609 if (!dm_gpio_is_valid(&cdev->ec_int))
612 return dm_gpio_get_value(&cdev->ec_int);
615 int cros_ec_info(struct udevice *dev, struct ec_response_mkbp_info *info)
617 if (ec_command(dev, EC_CMD_MKBP_INFO, 0, NULL, 0, info,
618 sizeof(*info)) != sizeof(*info))
624 int cros_ec_get_event_mask(struct udevice *dev, uint type, uint32_t *mask)
626 struct ec_response_host_event_mask rsp;
629 ret = ec_command(dev, type, 0, NULL, 0, &rsp, sizeof(rsp));
632 else if (ret != sizeof(rsp))
640 int cros_ec_set_event_mask(struct udevice *dev, uint type, uint32_t mask)
642 struct ec_params_host_event_mask req;
647 ret = ec_command(dev, type, 0, &req, sizeof(req), NULL, 0);
654 int cros_ec_get_host_events(struct udevice *dev, uint32_t *events_ptr)
656 struct ec_response_host_event_mask *resp;
659 * Use the B copy of the event flags, because the main copy is already
662 if (ec_command_inptr(dev, EC_CMD_HOST_EVENT_GET_B, 0, NULL, 0,
663 (uint8_t **)&resp, sizeof(*resp)) < (int)sizeof(*resp))
666 if (resp->mask & EC_HOST_EVENT_MASK(EC_HOST_EVENT_INVALID))
669 *events_ptr = resp->mask;
673 int cros_ec_clear_host_events(struct udevice *dev, uint32_t events)
675 struct ec_params_host_event_mask params;
677 params.mask = events;
680 * Use the B copy of the event flags, so it affects the data returned
681 * by cros_ec_get_host_events().
683 if (ec_command_inptr(dev, EC_CMD_HOST_EVENT_CLEAR_B, 0,
684 ¶ms, sizeof(params), NULL, 0) < 0)
690 int cros_ec_flash_protect(struct udevice *dev, uint32_t set_mask,
692 struct ec_response_flash_protect *resp)
694 struct ec_params_flash_protect params;
696 params.mask = set_mask;
697 params.flags = set_flags;
699 if (ec_command(dev, EC_CMD_FLASH_PROTECT, EC_VER_FLASH_PROTECT,
700 ¶ms, sizeof(params),
701 resp, sizeof(*resp)) != sizeof(*resp))
707 int cros_ec_entering_mode(struct udevice *dev, int mode)
711 rc = ec_command(dev, EC_CMD_ENTERING_MODE, 0, &mode, sizeof(mode),
718 static int cros_ec_check_version(struct udevice *dev)
720 struct cros_ec_dev *cdev = dev_get_uclass_priv(dev);
721 struct ec_params_hello req;
722 struct ec_response_hello *resp;
724 struct dm_cros_ec_ops *ops;
727 ops = dm_cros_ec_get_ops(dev);
728 if (ops->check_version) {
729 ret = ops->check_version(dev);
735 * TODO(sjg@chromium.org).
736 * There is a strange oddity here with the EC. We could just ignore
737 * the response, i.e. pass the last two parameters as NULL and 0.
738 * In this case we won't read back very many bytes from the EC.
739 * On the I2C bus the EC gets upset about this and will try to send
740 * the bytes anyway. This means that we will have to wait for that
741 * to complete before continuing with a new EC command.
743 * This problem is probably unique to the I2C bus.
745 * So for now, just read all the data anyway.
748 /* Try sending a version 3 packet */
749 cdev->protocol_version = 3;
751 if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req),
752 (uint8_t **)&resp, sizeof(*resp)) > 0)
755 /* Try sending a version 2 packet */
756 cdev->protocol_version = 2;
757 if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req),
758 (uint8_t **)&resp, sizeof(*resp)) > 0)
762 * Fail if we're still here, since the EC doesn't understand any
763 * protcol version we speak. Version 1 interface without command
764 * version is no longer supported, and we don't know about any new
767 cdev->protocol_version = 0;
768 printf("%s: ERROR: old EC interface not supported\n", __func__);
772 int cros_ec_test(struct udevice *dev)
774 struct ec_params_hello req;
775 struct ec_response_hello *resp;
777 req.in_data = 0x12345678;
778 if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req),
779 (uint8_t **)&resp, sizeof(*resp)) < sizeof(*resp)) {
780 printf("ec_command_inptr() returned error\n");
783 if (resp->out_data != req.in_data + 0x01020304) {
784 printf("Received invalid handshake %x\n", resp->out_data);
791 int cros_ec_flash_offset(struct udevice *dev, enum ec_flash_region region,
792 uint32_t *offset, uint32_t *size)
794 struct ec_params_flash_region_info p;
795 struct ec_response_flash_region_info *r;
799 ret = ec_command_inptr(dev, EC_CMD_FLASH_REGION_INFO,
800 EC_VER_FLASH_REGION_INFO,
801 &p, sizeof(p), (uint8_t **)&r, sizeof(*r));
802 if (ret != sizeof(*r))
813 int cros_ec_flash_erase(struct udevice *dev, uint32_t offset, uint32_t size)
815 struct ec_params_flash_erase p;
819 return ec_command_inptr(dev, EC_CMD_FLASH_ERASE, 0, &p, sizeof(p),
824 * Write a single block to the flash
826 * Write a block of data to the EC flash. The size must not exceed the flash
827 * write block size which you can obtain from cros_ec_flash_write_burst_size().
829 * The offset starts at 0. You can obtain the region information from
830 * cros_ec_flash_offset() to find out where to write for a particular region.
832 * Attempting to write to the region where the EC is currently running from
833 * will result in an error.
835 * @param dev CROS-EC device
836 * @param data Pointer to data buffer to write
837 * @param offset Offset within flash to write to.
838 * @param size Number of bytes to write
839 * @return 0 if ok, -1 on error
841 static int cros_ec_flash_write_block(struct udevice *dev, const uint8_t *data,
842 uint32_t offset, uint32_t size)
844 struct ec_params_flash_write *p;
847 p = malloc(sizeof(*p) + size);
853 assert(data && p->size <= EC_FLASH_WRITE_VER0_SIZE);
854 memcpy(p + 1, data, p->size);
856 ret = ec_command_inptr(dev, EC_CMD_FLASH_WRITE, 0,
857 p, sizeof(*p) + size, NULL, 0) >= 0 ? 0 : -1;
865 * Return optimal flash write burst size
867 static int cros_ec_flash_write_burst_size(struct udevice *dev)
869 return EC_FLASH_WRITE_VER0_SIZE;
873 * Check if a block of data is erased (all 0xff)
875 * This function is useful when dealing with flash, for checking whether a
876 * data block is erased and thus does not need to be programmed.
878 * @param data Pointer to data to check (must be word-aligned)
879 * @param size Number of bytes to check (must be word-aligned)
880 * @return 0 if erased, non-zero if any word is not erased
882 static int cros_ec_data_is_erased(const uint32_t *data, int size)
885 size /= sizeof(uint32_t);
886 for (; size > 0; size -= 4, data++)
894 * Read back flash parameters
896 * This function reads back parameters of the flash as reported by the EC
898 * @param dev Pointer to device
899 * @param info Pointer to output flash info struct
901 int cros_ec_read_flashinfo(struct udevice *dev,
902 struct ec_response_flash_info *info)
906 ret = ec_command(dev, EC_CMD_FLASH_INFO, 0,
907 NULL, 0, info, sizeof(*info));
911 return ret < sizeof(*info) ? -1 : 0;
914 int cros_ec_flash_write(struct udevice *dev, const uint8_t *data,
915 uint32_t offset, uint32_t size)
917 struct cros_ec_dev *cdev = dev_get_uclass_priv(dev);
918 uint32_t burst = cros_ec_flash_write_burst_size(dev);
926 * TODO: round up to the nearest multiple of write size. Can get away
927 * without that on link right now because its write size is 4 bytes.
930 for (off = offset; off < end; off += burst, data += burst) {
933 /* If the data is empty, there is no point in programming it */
934 todo = min(end - off, burst);
935 if (cdev->optimise_flash_write &&
936 cros_ec_data_is_erased((uint32_t *)data, todo))
939 ret = cros_ec_flash_write_block(dev, data, off, todo);
948 * Run verification on a slot
950 * @param me CrosEc instance
951 * @param region Region to run verification on
952 * @return 0 if success or not applicable. Non-zero if verification failed.
954 int cros_ec_efs_verify(struct udevice *dev, enum ec_flash_region region)
956 struct ec_params_efs_verify p;
959 log_info("EFS: EC is verifying updated image...\n");
962 rv = ec_command(dev, EC_CMD_EFS_VERIFY, 0, &p, sizeof(p), NULL, 0);
964 log_info("EFS: Verification success\n");
967 if (rv == -EC_RES_INVALID_COMMAND) {
968 log_info("EFS: EC doesn't support EFS_VERIFY command\n");
971 log_info("EFS: Verification failed\n");
977 * Read a single block from the flash
979 * Read a block of data from the EC flash. The size must not exceed the flash
980 * write block size which you can obtain from cros_ec_flash_write_burst_size().
982 * The offset starts at 0. You can obtain the region information from
983 * cros_ec_flash_offset() to find out where to read for a particular region.
985 * @param dev CROS-EC device
986 * @param data Pointer to data buffer to read into
987 * @param offset Offset within flash to read from
988 * @param size Number of bytes to read
989 * @return 0 if ok, -1 on error
991 static int cros_ec_flash_read_block(struct udevice *dev, uint8_t *data,
992 uint32_t offset, uint32_t size)
994 struct ec_params_flash_read p;
999 return ec_command(dev, EC_CMD_FLASH_READ, 0,
1000 &p, sizeof(p), data, size) >= 0 ? 0 : -1;
1003 int cros_ec_flash_read(struct udevice *dev, uint8_t *data, uint32_t offset,
1006 uint32_t burst = cros_ec_flash_write_burst_size(dev);
1010 end = offset + size;
1011 for (off = offset; off < end; off += burst, data += burst) {
1012 ret = cros_ec_flash_read_block(dev, data, off,
1013 min(end - off, burst));
1021 int cros_ec_flash_update_rw(struct udevice *dev, const uint8_t *image,
1024 uint32_t rw_offset, rw_size;
1027 if (cros_ec_flash_offset(dev, EC_FLASH_REGION_ACTIVE, &rw_offset,
1030 if (image_size > (int)rw_size)
1033 /* Invalidate the existing hash, just in case the AP reboots
1034 * unexpectedly during the update. If that happened, the EC RW firmware
1035 * would be invalid, but the EC would still have the original hash.
1037 ret = cros_ec_invalidate_hash(dev);
1042 * Erase the entire RW section, so that the EC doesn't see any garbage
1043 * past the new image if it's smaller than the current image.
1045 * TODO: could optimize this to erase just the current image, since
1046 * presumably everything past that is 0xff's. But would still need to
1047 * round up to the nearest multiple of erase size.
1049 ret = cros_ec_flash_erase(dev, rw_offset, rw_size);
1053 /* Write the image */
1054 ret = cros_ec_flash_write(dev, image, rw_offset, image_size);
1061 int cros_ec_read_nvdata(struct udevice *dev, uint8_t *block, int size)
1063 struct ec_params_vbnvcontext p;
1066 if (size != EC_VBNV_BLOCK_SIZE && size != EC_VBNV_BLOCK_SIZE_V2)
1069 p.op = EC_VBNV_CONTEXT_OP_READ;
1071 len = ec_command(dev, EC_CMD_VBNV_CONTEXT, EC_VER_VBNV_CONTEXT,
1072 &p, sizeof(uint32_t) + size, block, size);
1074 log_err("Expected %d bytes, got %d\n", size, len);
1081 int cros_ec_write_nvdata(struct udevice *dev, const uint8_t *block, int size)
1083 struct ec_params_vbnvcontext p;
1086 if (size != EC_VBNV_BLOCK_SIZE && size != EC_VBNV_BLOCK_SIZE_V2)
1088 p.op = EC_VBNV_CONTEXT_OP_WRITE;
1089 memcpy(p.block, block, size);
1091 len = ec_command_inptr(dev, EC_CMD_VBNV_CONTEXT, EC_VER_VBNV_CONTEXT,
1092 &p, sizeof(uint32_t) + size, NULL, 0);
1099 int cros_ec_battery_cutoff(struct udevice *dev, uint8_t flags)
1101 struct ec_params_battery_cutoff p;
1105 len = ec_command(dev, EC_CMD_BATTERY_CUT_OFF, 1, &p, sizeof(p),
1113 int cros_ec_set_ldo(struct udevice *dev, uint8_t index, uint8_t state)
1115 struct ec_params_ldo_set params;
1117 params.index = index;
1118 params.state = state;
1120 if (ec_command_inptr(dev, EC_CMD_LDO_SET, 0, ¶ms, sizeof(params),
1127 int cros_ec_get_ldo(struct udevice *dev, uint8_t index, uint8_t *state)
1129 struct ec_params_ldo_get params;
1130 struct ec_response_ldo_get *resp;
1132 params.index = index;
1134 if (ec_command_inptr(dev, EC_CMD_LDO_GET, 0, ¶ms, sizeof(params),
1135 (uint8_t **)&resp, sizeof(*resp)) !=
1139 *state = resp->state;
1144 int cros_ec_register(struct udevice *dev)
1146 struct cros_ec_dev *cdev = dev_get_uclass_priv(dev);
1150 gpio_request_by_name(dev, "ec-interrupt", 0, &cdev->ec_int,
1152 cdev->optimise_flash_write = dev_read_bool(dev, "optimise-flash-write");
1154 if (cros_ec_check_version(dev)) {
1155 debug("%s: Could not detect CROS-EC version\n", __func__);
1156 return -CROS_EC_ERR_CHECK_VERSION;
1159 if (cros_ec_read_id(dev, id, sizeof(id))) {
1160 debug("%s: Could not read KBC ID\n", __func__);
1161 return -CROS_EC_ERR_READ_ID;
1164 /* Remember this device for use by the cros_ec command */
1165 debug("Google Chrome EC v%d CROS-EC driver ready, id '%s'\n",
1166 cdev->protocol_version, id);
1171 int cros_ec_decode_ec_flash(struct udevice *dev, struct fdt_cros_ec *config)
1173 ofnode flash_node, node;
1175 flash_node = dev_read_subnode(dev, "flash");
1176 if (!ofnode_valid(flash_node)) {
1177 debug("Failed to find flash node\n");
1181 if (ofnode_read_fmap_entry(flash_node, &config->flash)) {
1182 debug("Failed to decode flash node in chrome-ec\n");
1186 config->flash_erase_value = ofnode_read_s32_default(flash_node,
1188 ofnode_for_each_subnode(node, flash_node) {
1189 const char *name = ofnode_get_name(node);
1190 enum ec_flash_region region;
1192 if (0 == strcmp(name, "ro")) {
1193 region = EC_FLASH_REGION_RO;
1194 } else if (0 == strcmp(name, "rw")) {
1195 region = EC_FLASH_REGION_ACTIVE;
1196 } else if (0 == strcmp(name, "wp-ro")) {
1197 region = EC_FLASH_REGION_WP_RO;
1199 debug("Unknown EC flash region name '%s'\n", name);
1203 if (ofnode_read_fmap_entry(node, &config->region[region])) {
1204 debug("Failed to decode flash region in chrome-ec'\n");
1212 int cros_ec_i2c_tunnel(struct udevice *dev, int port, struct i2c_msg *in,
1216 struct ec_params_i2c_passthru p;
1217 uint8_t outbuf[EC_PROTO2_MAX_PARAM_SIZE];
1220 struct ec_response_i2c_passthru r;
1221 uint8_t inbuf[EC_PROTO2_MAX_PARAM_SIZE];
1223 struct ec_params_i2c_passthru *p = ¶ms.p;
1224 struct ec_response_i2c_passthru *r = &response.r;
1225 struct ec_params_i2c_passthru_msg *msg;
1226 uint8_t *pdata, *read_ptr = NULL;
1234 p->num_msgs = nmsgs;
1235 size = sizeof(*p) + p->num_msgs * sizeof(*msg);
1237 /* Create a message to write the register address and optional data */
1238 pdata = (uint8_t *)p + size;
1241 for (i = 0, msg = p->msg; i < nmsgs; i++, msg++, in++) {
1242 bool is_read = in->flags & I2C_M_RD;
1244 msg->addr_flags = in->addr;
1247 msg->addr_flags |= EC_I2C_FLAG_READ;
1248 read_len += in->len;
1250 if (sizeof(*r) + read_len > sizeof(response)) {
1251 puts("Read length too big for buffer\n");
1255 if (pdata - (uint8_t *)p + in->len > sizeof(params)) {
1256 puts("Params too large for buffer\n");
1259 memcpy(pdata, in->buf, in->len);
1264 rv = ec_command(dev, EC_CMD_I2C_PASSTHRU, 0, p, pdata - (uint8_t *)p,
1265 r, sizeof(*r) + read_len);
1269 /* Parse response */
1270 if (r->i2c_status & EC_I2C_STATUS_ERROR) {
1271 printf("Transfer failed with status=0x%x\n", r->i2c_status);
1275 if (rv < sizeof(*r) + read_len) {
1276 puts("Truncated read response\n");
1280 /* We only support a single read message for each transfer */
1282 memcpy(read_ptr, r->data, read_len);
1287 int cros_ec_check_feature(struct udevice *dev, int feature)
1289 struct ec_response_get_features r;
1292 rv = ec_command(dev, EC_CMD_GET_FEATURES, 0, &r, sizeof(r), NULL, 0);
1296 if (feature >= 8 * sizeof(r.flags))
1299 return r.flags[feature / 32] & EC_FEATURE_MASK_0(feature);
1303 * Query the EC for specified mask indicating enabled events.
1304 * The EC maintains separate event masks for SMI, SCI and WAKE.
1306 static int cros_ec_uhepi_cmd(struct udevice *dev, uint mask, uint action,
1310 struct ec_params_host_event req;
1311 struct ec_response_host_event rsp;
1313 req.action = action;
1314 req.mask_type = mask;
1315 if (action != EC_HOST_EVENT_GET)
1319 ret = ec_command(dev, EC_CMD_HOST_EVENT, 0, &req, sizeof(req), &rsp,
1322 if (action != EC_HOST_EVENT_GET)
1330 static int cros_ec_handle_non_uhepi_cmd(struct udevice *dev, uint hcmd,
1331 uint action, uint64_t *value)
1334 struct ec_params_host_event_mask req;
1335 struct ec_response_host_event_mask rsp;
1337 if (hcmd == INVALID_HCMD)
1340 if (action != EC_HOST_EVENT_GET)
1341 req.mask = (uint32_t)*value;
1345 ret = ec_command(dev, hcmd, 0, &req, sizeof(req), &rsp, sizeof(rsp));
1346 if (action != EC_HOST_EVENT_GET)
1354 bool cros_ec_is_uhepi_supported(struct udevice *dev)
1356 #define UHEPI_SUPPORTED 1
1357 #define UHEPI_NOT_SUPPORTED 2
1358 static int uhepi_support;
1360 if (!uhepi_support) {
1361 uhepi_support = cros_ec_check_feature(dev,
1362 EC_FEATURE_UNIFIED_WAKE_MASKS) > 0 ? UHEPI_SUPPORTED :
1363 UHEPI_NOT_SUPPORTED;
1364 log_debug("Chrome EC: UHEPI %s\n",
1365 uhepi_support == UHEPI_SUPPORTED ? "supported" :
1368 return uhepi_support == UHEPI_SUPPORTED;
1371 static int cros_ec_get_mask(struct udevice *dev, uint type)
1375 if (cros_ec_is_uhepi_supported(dev)) {
1376 cros_ec_uhepi_cmd(dev, type, EC_HOST_EVENT_GET, &value);
1378 assert(type < ARRAY_SIZE(event_map));
1379 cros_ec_handle_non_uhepi_cmd(dev, event_map[type].get_cmd,
1380 EC_HOST_EVENT_GET, &value);
1385 static int cros_ec_clear_mask(struct udevice *dev, uint type, u64 mask)
1387 if (cros_ec_is_uhepi_supported(dev))
1388 return cros_ec_uhepi_cmd(dev, type, EC_HOST_EVENT_CLEAR, &mask);
1390 assert(type < ARRAY_SIZE(event_map));
1392 return cros_ec_handle_non_uhepi_cmd(dev, event_map[type].clear_cmd,
1393 EC_HOST_EVENT_CLEAR, &mask);
1396 uint64_t cros_ec_get_events_b(struct udevice *dev)
1398 return cros_ec_get_mask(dev, EC_HOST_EVENT_B);
1401 int cros_ec_clear_events_b(struct udevice *dev, uint64_t mask)
1403 log_debug("Chrome EC: clear events_b mask to 0x%016llx\n", mask);
1405 return cros_ec_clear_mask(dev, EC_HOST_EVENT_B, mask);
1408 int cros_ec_read_limit_power(struct udevice *dev, int *limit_powerp)
1410 struct ec_params_charge_state p;
1411 struct ec_response_charge_state r;
1414 p.cmd = CHARGE_STATE_CMD_GET_PARAM;
1415 p.get_param.param = CS_PARAM_LIMIT_POWER;
1416 ret = ec_command(dev, EC_CMD_CHARGE_STATE, 0, &p, sizeof(p),
1420 * If our EC doesn't support the LIMIT_POWER parameter, assume that
1421 * LIMIT_POWER is not requested.
1423 if (ret == -EC_RES_INVALID_PARAM || ret == -EC_RES_INVALID_COMMAND) {
1424 log_warning("PARAM_LIMIT_POWER not supported by EC\n");
1428 if (ret != sizeof(r.get_param))
1431 *limit_powerp = r.get_param.value;
1435 int cros_ec_config_powerbtn(struct udevice *dev, uint32_t flags)
1437 struct ec_params_config_power_button params;
1440 params.flags = flags;
1441 ret = ec_command(dev, EC_CMD_CONFIG_POWER_BUTTON, 0,
1442 ¶ms, sizeof(params), NULL, 0);
1449 int cros_ec_get_lid_shutdown_mask(struct udevice *dev)
1454 ret = cros_ec_get_event_mask(dev, EC_CMD_HOST_EVENT_GET_SMI_MASK,
1459 return !!(mask & EC_HOST_EVENT_MASK(EC_HOST_EVENT_LID_CLOSED));
1462 int cros_ec_set_lid_shutdown_mask(struct udevice *dev, int enable)
1467 ret = cros_ec_get_event_mask(dev, EC_CMD_HOST_EVENT_GET_SMI_MASK,
1472 /* Set lid close event state in the EC SMI event mask */
1474 mask |= EC_HOST_EVENT_MASK(EC_HOST_EVENT_LID_CLOSED);
1476 mask &= ~EC_HOST_EVENT_MASK(EC_HOST_EVENT_LID_CLOSED);
1478 ret = cros_ec_set_event_mask(dev, EC_CMD_HOST_EVENT_SET_SMI_MASK, mask);
1482 printf("EC: %sabled lid close event\n", enable ? "en" : "dis");
1486 UCLASS_DRIVER(cros_ec) = {
1487 .id = UCLASS_CROS_EC,
1489 .per_device_auto_alloc_size = sizeof(struct cros_ec_dev),
1490 .post_bind = dm_scan_fdt_dev,
1491 .flags = DM_UC_FLAG_ALLOC_PRIV_DMA,