1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Chromium OS cros_ec driver
5 * Copyright (c) 2012 The Chromium OS Authors.
11 #include <linux/compiler.h>
12 #include <ec_commands.h>
13 #include <cros_ec_message.h>
15 #include <dm/of_extra.h>
17 /* Our configuration information */
19 struct udevice *dev; /* Transport device */
20 struct gpio_desc ec_int; /* GPIO used as EC interrupt line */
21 int protocol_version; /* Protocol version to use */
22 int optimise_flash_write; /* Don't write erased flash blocks */
25 * These two buffers will always be dword-aligned and include enough
26 * space for up to 7 word-alignment bytes also, so we can ensure that
27 * the body of the message is always dword-aligned (64-bit).
29 * We use this alignment to keep ARM and x86 happy. Probably word
30 * alignment would be OK, there might be a small performance advantage
33 uint8_t din[ALIGN(MSG_BYTES + sizeof(int64_t), sizeof(int64_t))]
34 __aligned(sizeof(int64_t));
35 uint8_t dout[ALIGN(MSG_BYTES + sizeof(int64_t), sizeof(int64_t))]
36 __aligned(sizeof(int64_t));
40 * Hard-code the number of columns we happen to know we have right now. It
41 * would be more correct to call cros_ec_info() at startup and determine the
42 * actual number of keyboard cols from there.
44 #define CROS_EC_KEYSCAN_COLS 13
46 /* Information returned by a key scan */
48 uint8_t data[CROS_EC_KEYSCAN_COLS];
51 /* Holds information about the Chrome EC */
53 struct fmap_entry flash; /* Address and size of EC flash */
55 * Byte value of erased flash, or -1 if not known. It is normally
56 * 0xff but some flash devices use 0 (e.g. STM32Lxxx)
58 int flash_erase_value;
59 struct fmap_entry region[EC_FLASH_REGION_COUNT];
63 * Read the ID of the CROS-EC device
65 * The ID is a string identifying the CROS-EC device.
67 * @param dev CROS-EC device
68 * @param id Place to put the ID
69 * @param maxlen Maximum length of the ID field
70 * Return: 0 if ok, -1 on error
72 int cros_ec_read_id(struct udevice *dev, char *id, int maxlen);
75 * Read a keyboard scan from the CROS-EC device
77 * Send a message requesting a keyboard scan and return the result
79 * @param dev CROS-EC device
80 * @param scan Place to put the scan results
81 * Return: 0 if ok, -1 on error
83 int cros_ec_scan_keyboard(struct udevice *dev, struct mbkp_keyscan *scan);
86 * Get the next pending MKBP event from the ChromeOS EC device.
88 * Send a message requesting the next event and return the result.
90 * @param event Place to put the event.
91 * Return: 0 if ok, <0 on error.
93 int cros_ec_get_next_event(struct udevice *dev,
94 struct ec_response_get_next_event *event);
97 * Read which image is currently running on the CROS-EC device.
99 * @param dev CROS-EC device
100 * @param image Destination for image identifier
101 * Return: 0 if ok, <0 on error
103 int cros_ec_read_current_image(struct udevice *dev,
104 enum ec_current_image *image);
107 * Read the hash of the CROS-EC device firmware.
109 * @param dev CROS-EC device
110 * @param hash_offset Offset in flash to read from
111 * @param hash Destination for hash information
112 * Return: 0 if ok, <0 on error
114 int cros_ec_read_hash(struct udevice *dev, uint hash_offset,
115 struct ec_response_vboot_hash *hash);
118 * Send a reboot command to the CROS-EC device.
120 * Note that some reboot commands (such as EC_REBOOT_COLD) also reboot the AP.
122 * @param dev CROS-EC device
123 * @param cmd Reboot command
124 * @param flags Flags for reboot command (EC_REBOOT_FLAG_*)
125 * Return: 0 if ok, <0 on error
127 int cros_ec_reboot(struct udevice *dev, enum ec_reboot_cmd cmd, uint8_t flags);
130 * Check if the CROS-EC device has an interrupt pending.
132 * Read the status of the external interrupt connected to the CROS-EC device.
133 * If no external interrupt is configured, this always returns 1.
135 * @param dev CROS-EC device
136 * Return: 0 if no interrupt is pending
138 int cros_ec_interrupt_pending(struct udevice *dev);
143 CROS_EC_ERR_FDT_DECODE,
144 CROS_EC_ERR_CHECK_VERSION,
146 CROS_EC_ERR_DEV_INIT,
150 * Initialise the Chromium OS EC driver
152 * @param blob Device tree blob containing setup information
153 * @param cros_ecp Returns pointer to the cros_ec device, or NULL if none
154 * Return: 0 if we got an cros_ec device and all is well (or no cros_ec is
155 * expected), -ve if we should have an cros_ec device but failed to find
156 * one, or init failed (-CROS_EC_ERR_...).
158 int cros_ec_init(const void *blob, struct udevice**cros_ecp);
161 * Read information about the keyboard matrix
163 * @param dev CROS-EC device
164 * @param info Place to put the info structure
166 int cros_ec_info(struct udevice *dev, struct ec_response_mkbp_info *info);
169 * Read the host event flags
171 * @param dev CROS-EC device
172 * @param events_ptr Destination for event flags. Not changed on error.
173 * Return: 0 if ok, <0 on error
175 int cros_ec_get_host_events(struct udevice *dev, uint32_t *events_ptr);
178 * Clear the specified host event flags
180 * @param dev CROS-EC device
181 * @param events Event flags to clear
182 * Return: 0 if ok, <0 on error
184 int cros_ec_clear_host_events(struct udevice *dev, uint32_t events);
187 * Get/set flash protection
189 * @param dev CROS-EC device
190 * @param set_mask Mask of flags to set; if 0, just retrieves existing
191 * protection state without changing it.
192 * @param set_flags New flag values; only bits in set_mask are applied;
193 * ignored if set_mask=0.
194 * @param prot Destination for updated protection state from EC.
195 * Return: 0 if ok, <0 on error
197 int cros_ec_flash_protect(struct udevice *dev, uint32_t set_mask,
199 struct ec_response_flash_protect *resp);
202 * Run internal tests on the cros_ec interface.
204 * @param dev CROS-EC device
205 * Return: 0 if ok, <0 if the test failed
207 int cros_ec_test(struct udevice *dev);
210 * Update the EC RW copy.
212 * @param dev CROS-EC device
213 * @param image the content to write
214 * @param imafge_size content length
215 * Return: 0 if ok, <0 if the test failed
217 int cros_ec_flash_update_rw(struct udevice *dev, const uint8_t *image,
221 * Return a pointer to the board's CROS-EC device
223 * Return: pointer to CROS-EC device, or NULL if none is available
225 struct udevice *board_get_cros_ec_dev(void);
227 struct dm_cros_ec_ops {
229 * check_version() - Check the protocol version being used (optional)
231 * If provided, this function should check that the EC can be supported
232 * by the driver. If not provided, HELLO messages will be sent to try
233 * to determine the protocol version.
235 * @dev: Device to check
236 * @return 0 if the protocol is valid, -ve if not supported
238 int (*check_version)(struct udevice *dev);
241 * command() - Old-style command interface
243 * This sends a command and receives a response (deprecated, use
246 * @dev: Device to use
247 * @cmd: Command to send (only supports 0-0xff)
248 * @cmd_version: Version of command to send (often 0)
249 * @dout: Output data (may be NULL If dout_len=0)
250 * @dout_len: Length of output data excluding 4-byte header
251 * @dinp: On input, set to point to input data, often struct
252 * cros_ec_dev->din - typically this is left alone but may be
253 * updated by the driver
254 * @din_len: Maximum length of response
255 * @return number of bytes in response, or -ve on error
257 int (*command)(struct udevice *dev, uint8_t cmd, int cmd_version,
258 const uint8_t *dout, int dout_len,
259 uint8_t **dinp, int din_len);
262 * packet() - New-style command interface
264 * This interface is preferred over command(), since it is typically
265 * easier to implement.
267 * @dev: Device to use
268 * @out_bytes: Number of bytes to send (from struct cros_ec_dev->dout)
269 * @in_bytes: Maximum number of bytes to expect in response
270 * @return number of bytes in response, or -ve on error
272 int (*packet)(struct udevice *dev, int out_bytes, int in_bytes);
275 * get_switches() - Get value of EC switches
277 * This is currently supported on the LPC EC.
279 * @dev: Device to use
280 * @return current switches value, or -ENOSYS if not supported
282 int (*get_switches)(struct udevice *dev);
285 #define dm_cros_ec_get_ops(dev) \
286 ((struct dm_cros_ec_ops *)(dev)->driver->ops)
288 int cros_ec_register(struct udevice *dev);
291 * Dump a block of data for a command.
293 * @param name Name for data (e.g. 'in', 'out')
294 * @param cmd Command number associated with data, or -1 for none
295 * @param data Data block to dump
296 * @param len Length of data block to dump
298 void cros_ec_dump_data(const char *name, int cmd, const uint8_t *data, int len);
301 * Calculate a simple 8-bit checksum of a data block
303 * @param data Data block to checksum
304 * @param size Size of data block in bytes
305 * Return: checksum value (0 to 255)
307 int cros_ec_calc_checksum(const uint8_t *data, int size);
309 int cros_ec_flash_erase(struct udevice *dev, uint32_t offset, uint32_t size);
312 * Read data from the flash
314 * Read an arbitrary amount of data from the EC flash, by repeatedly reading
317 * The offset starts at 0. You can obtain the region information from
318 * cros_ec_flash_offset() to find out where to read for a particular region.
320 * @param dev CROS-EC device
321 * @param data Pointer to data buffer to read into
322 * @param offset Offset within flash to read from
323 * @param size Number of bytes to read
324 * Return: 0 if ok, -1 on error
326 int cros_ec_flash_read(struct udevice *dev, uint8_t *data, uint32_t offset,
330 * Read back flash parameters
332 * This function reads back parameters of the flash as reported by the EC
334 * @param dev Pointer to device
335 * @param info Pointer to output flash info struct
337 int cros_ec_read_flashinfo(struct udevice *dev,
338 struct ec_response_flash_info *info);
341 * Write data to the flash
343 * Write an arbitrary amount of data to the EC flash, by repeatedly writing
346 * The offset starts at 0. You can obtain the region information from
347 * cros_ec_flash_offset() to find out where to write for a particular region.
349 * Attempting to write to the region where the EC is currently running from
350 * will result in an error.
352 * @param dev CROS-EC device
353 * @param data Pointer to data buffer to write
354 * @param offset Offset within flash to write to.
355 * @param size Number of bytes to write
356 * Return: 0 if ok, -1 on error
358 int cros_ec_flash_write(struct udevice *dev, const uint8_t *data,
359 uint32_t offset, uint32_t size);
362 * Obtain position and size of a flash region
364 * @param dev CROS-EC device
365 * @param region Flash region to query
366 * @param offset Returns offset of flash region in EC flash
367 * @param size Returns size of flash region
368 * Return: 0 if ok, -1 on error
370 int cros_ec_flash_offset(struct udevice *dev, enum ec_flash_region region,
371 uint32_t *offset, uint32_t *size);
374 * cros_ec_get_sku_id() - Read the SKU ID
376 * @dev: CROS-EC device
377 * return SKU ID, or -ve on error
379 int cros_ec_get_sku_id(struct udevice *dev);
382 * Read/write non-volatile data from/to a CROS-EC device.
384 * @param dev CROS-EC device
385 * @param block Buffer of VbNvContext to be read/write
386 * Return: 0 if ok, -1 on error
388 int cros_ec_read_nvdata(struct udevice *dev, uint8_t *block, int size);
389 int cros_ec_write_nvdata(struct udevice *dev, const uint8_t *block, int size);
392 * Read the version information for the EC images
394 * @param dev CROS-EC device
395 * @param versionp This is set to point to the version information
396 * Return: 0 if ok, -1 on error
398 int cros_ec_read_version(struct udevice *dev,
399 struct ec_response_get_version **versionp);
402 * Read the build information for the EC
404 * @param dev CROS-EC device
405 * @param versionp This is set to point to the build string
406 * Return: 0 if ok, -1 on error
408 int cros_ec_read_build_info(struct udevice *dev, char **strp);
411 * Switch on/off a LDO / FET.
413 * @param dev CROS-EC device
414 * @param index index of the LDO/FET to switch
415 * @param state new state of the LDO/FET : EC_LDO_STATE_ON|OFF
416 * Return: 0 if ok, -1 on error
418 int cros_ec_set_ldo(struct udevice *dev, uint8_t index, uint8_t state);
421 * Read back a LDO / FET current state.
423 * @param dev CROS-EC device
424 * @param index index of the LDO/FET to switch
425 * @param state current state of the LDO/FET : EC_LDO_STATE_ON|OFF
426 * Return: 0 if ok, -1 on error
428 int cros_ec_get_ldo(struct udevice *dev, uint8_t index, uint8_t *state);
431 * Get access to the error reported when cros_ec_board_init() was called
433 * This permits delayed reporting of the EC error if it failed during
436 * Return: error (0 if there was no error, -ve if there was an error)
438 int cros_ec_get_error(void);
441 * Returns information from the FDT about the Chrome EC flash
443 * @param dev Device to read from
444 * @param config Structure to use to return information
446 int cros_ec_decode_ec_flash(struct udevice *dev, struct fdt_cros_ec *config);
449 * Check the current keyboard state, in case recovery mode is requested.
450 * This function is for sandbox only.
452 * @param ec CROS-EC device
454 void cros_ec_check_keyboard(struct udevice *dev);
458 * Tunnel an I2C transfer to the EC
460 * @param dev CROS-EC device
461 * @param port The remote port on EC to use
462 * @param msg List of messages to transfer
463 * @param nmsgs Number of messages to transfer
465 int cros_ec_i2c_tunnel(struct udevice *dev, int port, struct i2c_msg *msg,
469 * cros_ec_get_events_b() - Get event mask B
471 * Return: value of event mask, default value of 0 if it could not be read
473 uint64_t cros_ec_get_events_b(struct udevice *dev);
476 * cros_ec_clear_events_b() - Clear even mask B
478 * Any pending events in the B range are cleared
480 * Return: 0 if OK, -ve on error
482 int cros_ec_clear_events_b(struct udevice *dev, uint64_t mask);
485 * cros_ec_efs_verify() - tell the EC to verify one of its images
487 * @param dev CROS-EC device
488 * @param region Flash region to query
489 * Return: 0 if OK, -ve on error
491 int cros_ec_efs_verify(struct udevice *dev, enum ec_flash_region region);
494 * cros_ec_battery_cutoff() - Request that the battery be cut off
496 * This tells the battery to stop supplying power. This is used before shipping
497 * a device to ensure that the battery remains charged while the device is
498 * shipped or sitting on the shelf waiting to be purchased.
500 * @param dev CROS-EC device
501 * @param flags Flags to use (EC_BATTERY_CUTOFF_FLAG_...)
502 * Return: 0 if OK, -ve on error
504 int cros_ec_battery_cutoff(struct udevice *dev, uint8_t flags);
507 * cros_ec_set_pwm_duty() - Set duty cycle of a generic pwm
509 * Note that duty value needs to be passed to the EC as a 16 bit number
510 * for increased precision.
512 * @param dev CROS-EC device
513 * @param index Index of the pwm
514 * @param duty Desired duty cycle, in 0..EC_PWM_MAX_DUTY range.
515 * Return: 0 if OK, -ve on error
517 int cros_ec_set_pwm_duty(struct udevice *dev, uint8_t index, uint16_t duty);
520 * cros_ec_read_limit_power() - Check if power is limited by batter/charger
522 * Sometimes the battery is low and / or the device is connected to a charger
523 * that cannot supply much power.
525 * @param dev CROS-EC device
526 * @param limit_powerp Returns whether power is limited (0 or 1)
527 * Return: 0 if OK, -ENOSYS if the EC does not support this comment, -EINVAL
528 * if the EC returned an invalid response
530 int cros_ec_read_limit_power(struct udevice *dev, int *limit_powerp);
533 * cros_ec_config_powerbtn() - Configure the behaviour of the power button
535 * @param dev CROS-EC device
536 * @param flags Flags to use (EC_POWER_BUTTON_...)
537 * Return: 0 if OK, -ve on error
539 int cros_ec_config_powerbtn(struct udevice *dev, uint32_t flags);
542 * cros_ec_get_lid_shutdown_mask() - Set the lid shutdown mask
544 * Determines whether a lid close event is reported
546 * @param dev CROS-EC device
547 * Return: shufdown mas if OK, -ve on error
549 int cros_ec_get_lid_shutdown_mask(struct udevice *dev);
552 * cros_ec_set_lid_shutdown_mask() - Set the lid shutdown mask
554 * Set whether a lid close event is reported
556 * @param dev CROS-EC device
557 * @param enable true to enable reporting, false to disable
558 * Return: shufdown mas if OK, -ve on error
560 int cros_ec_set_lid_shutdown_mask(struct udevice *dev, int enable);
563 * cros_ec_hello() - Send a hello message
565 * Sends a message with a fixed input value and checks that the expected output
568 * @dev: CROS-EC device
569 * @handshakep: If non-NULL, returns received handshake value on error
570 * Return: 0 if OK, -ve on error
572 int cros_ec_hello(struct udevice *dev, uint *handshakep);
575 * cros_ec_get_features() - Get the set of features provided by the EC
577 * See enum ec_feature_code for the list of available features
579 * @dev: CROS-EC device
580 * @featuresp: Returns a bitmask of supported features
581 * Return: 0 if OK, -ve on error
583 int cros_ec_get_features(struct udevice *dev, u64 *featuresp);
586 * cros_ec_check_feature() - Check if a feature is supported
588 * @dev: CROS-EC device
589 * @feature: Feature number to check (enum ec_feature_code)
590 * Return: true if supported, false if not, -ve on error
592 int cros_ec_check_feature(struct udevice *dev, uint feature);
595 * cros_ec_get_switches() - Get switches value
597 * @dev: CROS-EC device
598 * Return: switches value, or -ENOSYS if not supported, or other -ve value on
601 int cros_ec_get_switches(struct udevice *dev);
604 * cros_ec_vstore_supported() - Check if vstore is supported
606 * @dev: CROS-EC device
607 * Return: false if not supported, true if supported, -ve on error
609 int cros_ec_vstore_supported(struct udevice *dev);
612 * cros_ec_vstore_info() - Get vstore information
614 * @dev: CROS-EC device
615 * @lockedp: mask of locked slots
616 * Return: number of vstore slots supported by the EC,, -ve on error
618 int cros_ec_vstore_info(struct udevice *dev, u32 *lockedp);
621 * cros_ec_vstore_read() - Read data from EC vstore slot
623 * @dev: CROS-EC device
624 * @slot: vstore slot to read from
625 * @data: buffer to store read data, must be EC_VSTORE_SLOT_SIZE bytes
626 * Return: 0 if OK, -ve on error
628 int cros_ec_vstore_read(struct udevice *dev, int slot, uint8_t *data);
631 * cros_ec_vstore_write() - Save data into EC vstore slot
633 * The maximum size of data is EC_VSTORE_SLOT_SIZE. It is the caller's
634 * responsibility to check the number of implemented slots by querying the
637 * @dev: CROS-EC device
638 * @slot: vstore slot to write into
639 * @data: data to write
640 * @size: size of data in bytes
641 * Return: 0 if OK, -ve on error
643 int cros_ec_vstore_write(struct udevice *dev, int slot, const uint8_t *data,
647 * cros_ec_read_batt_charge() - Read the battery-charge state
649 * @dev: CROS-EC device
650 * @chargep: Return battery-charge state as a percentage
651 * Return: 0 if OK, -ve on error
653 int cros_ec_read_batt_charge(struct udevice *dev, uint *chargep);