2 * Chromium OS cros_ec driver
4 * Copyright (c) 2012 The Chromium OS Authors.
6 * SPDX-License-Identifier: GPL-2.0+
12 #include <linux/compiler.h>
13 #include <ec_commands.h>
15 #include <cros_ec_message.h>
18 #ifndef CONFIG_DM_CROS_EC
19 /* Which interface is the device on? */
20 enum cros_ec_interface_t {
24 CROS_EC_IF_LPC, /* Intel Low Pin Count interface */
29 /* Our configuration information */
31 #ifdef CONFIG_DM_CROS_EC
32 struct udevice *dev; /* Transport device */
34 enum cros_ec_interface_t interface;
35 struct spi_slave *spi; /* Our SPI slave, if using SPI */
36 int node; /* Our node */
37 int parent_node; /* Our parent node (interface) */
38 unsigned int cs; /* Our chip select */
39 unsigned int addr; /* Device address (for I2C) */
40 unsigned int bus_num; /* Bus number (for I2C) */
41 unsigned int max_frequency; /* Maximum interface frequency */
43 struct gpio_desc ec_int; /* GPIO used as EC interrupt line */
44 int protocol_version; /* Protocol version to use */
45 int optimise_flash_write; /* Don't write erased flash blocks */
48 * These two buffers will always be dword-aligned and include enough
49 * space for up to 7 word-alignment bytes also, so we can ensure that
50 * the body of the message is always dword-aligned (64-bit).
52 * We use this alignment to keep ARM and x86 happy. Probably word
53 * alignment would be OK, there might be a small performance advantage
56 uint8_t din[ALIGN(MSG_BYTES + sizeof(int64_t), sizeof(int64_t))]
57 __aligned(sizeof(int64_t));
58 uint8_t dout[ALIGN(MSG_BYTES + sizeof(int64_t), sizeof(int64_t))]
59 __aligned(sizeof(int64_t));
63 * Hard-code the number of columns we happen to know we have right now. It
64 * would be more correct to call cros_ec_info() at startup and determine the
65 * actual number of keyboard cols from there.
67 #define CROS_EC_KEYSCAN_COLS 13
69 /* Information returned by a key scan */
71 uint8_t data[CROS_EC_KEYSCAN_COLS];
74 /* Holds information about the Chrome EC */
76 struct fmap_entry flash; /* Address and size of EC flash */
78 * Byte value of erased flash, or -1 if not known. It is normally
79 * 0xff but some flash devices use 0 (e.g. STM32Lxxx)
81 int flash_erase_value;
82 struct fmap_entry region[EC_FLASH_REGION_COUNT];
86 * Read the ID of the CROS-EC device
88 * The ID is a string identifying the CROS-EC device.
90 * @param dev CROS-EC device
91 * @param id Place to put the ID
92 * @param maxlen Maximum length of the ID field
93 * @return 0 if ok, -1 on error
95 int cros_ec_read_id(struct cros_ec_dev *dev, char *id, int maxlen);
98 * Read a keyboard scan from the CROS-EC device
100 * Send a message requesting a keyboard scan and return the result
102 * @param dev CROS-EC device
103 * @param scan Place to put the scan results
104 * @return 0 if ok, -1 on error
106 int cros_ec_scan_keyboard(struct cros_ec_dev *dev, struct mbkp_keyscan *scan);
109 * Read which image is currently running on the CROS-EC device.
111 * @param dev CROS-EC device
112 * @param image Destination for image identifier
113 * @return 0 if ok, <0 on error
115 int cros_ec_read_current_image(struct cros_ec_dev *dev,
116 enum ec_current_image *image);
119 * Read the hash of the CROS-EC device firmware.
121 * @param dev CROS-EC device
122 * @param hash Destination for hash information
123 * @return 0 if ok, <0 on error
125 int cros_ec_read_hash(struct cros_ec_dev *dev,
126 struct ec_response_vboot_hash *hash);
129 * Send a reboot command to the CROS-EC device.
131 * Note that some reboot commands (such as EC_REBOOT_COLD) also reboot the AP.
133 * @param dev CROS-EC device
134 * @param cmd Reboot command
135 * @param flags Flags for reboot command (EC_REBOOT_FLAG_*)
136 * @return 0 if ok, <0 on error
138 int cros_ec_reboot(struct cros_ec_dev *dev, enum ec_reboot_cmd cmd,
142 * Check if the CROS-EC device has an interrupt pending.
144 * Read the status of the external interrupt connected to the CROS-EC device.
145 * If no external interrupt is configured, this always returns 1.
147 * @param dev CROS-EC device
148 * @return 0 if no interrupt is pending
150 int cros_ec_interrupt_pending(struct cros_ec_dev *dev);
155 CROS_EC_ERR_FDT_DECODE,
156 CROS_EC_ERR_CHECK_VERSION,
158 CROS_EC_ERR_DEV_INIT,
162 * Initialise the Chromium OS EC driver
164 * @param blob Device tree blob containing setup information
165 * @param cros_ecp Returns pointer to the cros_ec device, or NULL if none
166 * @return 0 if we got an cros_ec device and all is well (or no cros_ec is
167 * expected), -ve if we should have an cros_ec device but failed to find
168 * one, or init failed (-CROS_EC_ERR_...).
170 int cros_ec_init(const void *blob, struct cros_ec_dev **cros_ecp);
173 * Read information about the keyboard matrix
175 * @param dev CROS-EC device
176 * @param info Place to put the info structure
178 int cros_ec_info(struct cros_ec_dev *dev,
179 struct ec_response_mkbp_info *info);
182 * Read the host event flags
184 * @param dev CROS-EC device
185 * @param events_ptr Destination for event flags. Not changed on error.
186 * @return 0 if ok, <0 on error
188 int cros_ec_get_host_events(struct cros_ec_dev *dev, uint32_t *events_ptr);
191 * Clear the specified host event flags
193 * @param dev CROS-EC device
194 * @param events Event flags to clear
195 * @return 0 if ok, <0 on error
197 int cros_ec_clear_host_events(struct cros_ec_dev *dev, uint32_t events);
200 * Get/set flash protection
202 * @param dev CROS-EC device
203 * @param set_mask Mask of flags to set; if 0, just retrieves existing
204 * protection state without changing it.
205 * @param set_flags New flag values; only bits in set_mask are applied;
206 * ignored if set_mask=0.
207 * @param prot Destination for updated protection state from EC.
208 * @return 0 if ok, <0 on error
210 int cros_ec_flash_protect(struct cros_ec_dev *dev,
211 uint32_t set_mask, uint32_t set_flags,
212 struct ec_response_flash_protect *resp);
216 * Run internal tests on the cros_ec interface.
218 * @param dev CROS-EC device
219 * @return 0 if ok, <0 if the test failed
221 int cros_ec_test(struct cros_ec_dev *dev);
224 * Update the EC RW copy.
226 * @param dev CROS-EC device
227 * @param image the content to write
228 * @param imafge_size content length
229 * @return 0 if ok, <0 if the test failed
231 int cros_ec_flash_update_rw(struct cros_ec_dev *dev,
232 const uint8_t *image, int image_size);
235 * Return a pointer to the board's CROS-EC device
237 * This should be implemented by board files.
239 * @return pointer to CROS-EC device, or NULL if none is available
241 struct cros_ec_dev *board_get_cros_ec_dev(void);
243 #ifdef CONFIG_DM_CROS_EC
245 struct dm_cros_ec_ops {
246 int (*check_version)(struct udevice *dev);
247 int (*command)(struct udevice *dev, uint8_t cmd, int cmd_version,
248 const uint8_t *dout, int dout_len,
249 uint8_t **dinp, int din_len);
250 int (*packet)(struct udevice *dev, int out_bytes, int in_bytes);
253 #define dm_cros_ec_get_ops(dev) \
254 ((struct dm_cros_ec_ops *)(dev)->driver->ops)
256 int cros_ec_register(struct udevice *dev);
258 #else /* !CONFIG_DM_CROS_EC */
260 /* Internal interfaces */
261 int cros_ec_i2c_init(struct cros_ec_dev *dev, const void *blob);
262 int cros_ec_spi_init(struct cros_ec_dev *dev, const void *blob);
263 int cros_ec_lpc_init(struct cros_ec_dev *dev, const void *blob);
264 int cros_ec_sandbox_init(struct cros_ec_dev *dev, const void *blob);
267 * Read information from the fdt for the i2c cros_ec interface
269 * @param dev CROS-EC device
270 * @param blob Device tree blob
271 * @return 0 if ok, -1 if we failed to read all required information
273 int cros_ec_i2c_decode_fdt(struct cros_ec_dev *dev, const void *blob);
276 * Read information from the fdt for the spi cros_ec interface
278 * @param dev CROS-EC device
279 * @param blob Device tree blob
280 * @return 0 if ok, -1 if we failed to read all required information
282 int cros_ec_spi_decode_fdt(struct cros_ec_dev *dev, const void *blob);
285 * Read information from the fdt for the sandbox cros_ec interface
287 * @param dev CROS-EC device
288 * @param blob Device tree blob
289 * @return 0 if ok, -1 if we failed to read all required information
291 int cros_ec_sandbox_decode_fdt(struct cros_ec_dev *dev, const void *blob);
294 * Check whether the LPC interface supports new-style commands.
296 * LPC has its own way of doing this, which involves checking LPC values
297 * visible to the host. Do this, and update dev->protocol_version accordingly.
299 * @param dev CROS-EC device to check
301 int cros_ec_lpc_check_version(struct cros_ec_dev *dev);
304 * Send a command to an I2C CROS-EC device and return the reply.
306 * This rather complicated function deals with sending both old-style and
307 * new-style commands. The old ones have just a command byte and arguments.
308 * The new ones have version, command, arg-len, [args], chksum so are 3 bytes
311 * The device's internal input/output buffers are used.
313 * @param dev CROS-EC device
314 * @param cmd Command to send (EC_CMD_...)
315 * @param cmd_version Version of command to send (EC_VER_...)
316 * @param dout Output data (may be NULL If dout_len=0)
317 * @param dout_len Size of output data in bytes
318 * @param dinp Returns pointer to response data
319 * @param din_len Maximum size of response in bytes
320 * @return number of bytes in response, or -1 on error
322 int cros_ec_i2c_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
323 const uint8_t *dout, int dout_len,
324 uint8_t **dinp, int din_len);
327 * Send a command to a LPC CROS-EC device and return the reply.
329 * The device's internal input/output buffers are used.
331 * @param dev CROS-EC device
332 * @param cmd Command to send (EC_CMD_...)
333 * @param cmd_version Version of command to send (EC_VER_...)
334 * @param dout Output data (may be NULL If dout_len=0)
335 * @param dout_len Size of output data in bytes
336 * @param dinp Returns pointer to response data
337 * @param din_len Maximum size of response in bytes
338 * @return number of bytes in response, or -1 on error
340 int cros_ec_lpc_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
341 const uint8_t *dout, int dout_len,
342 uint8_t **dinp, int din_len);
344 int cros_ec_spi_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
345 const uint8_t *dout, int dout_len,
346 uint8_t **dinp, int din_len);
349 * Send a packet to a CROS-EC device and return the response packet.
351 * Expects the request packet to be stored in dev->dout. Stores the response
352 * packet in dev->din.
354 * @param dev CROS-EC device
355 * @param out_bytes Size of request packet to output
356 * @param in_bytes Maximum size of response packet to receive
357 * @return number of bytes in response packet, or <0 on error
359 int cros_ec_spi_packet(struct cros_ec_dev *dev, int out_bytes, int in_bytes);
360 int cros_ec_sandbox_packet(struct cros_ec_dev *dev, int out_bytes,
365 * Dump a block of data for a command.
367 * @param name Name for data (e.g. 'in', 'out')
368 * @param cmd Command number associated with data, or -1 for none
369 * @param data Data block to dump
370 * @param len Length of data block to dump
372 void cros_ec_dump_data(const char *name, int cmd, const uint8_t *data, int len);
375 * Calculate a simple 8-bit checksum of a data block
377 * @param data Data block to checksum
378 * @param size Size of data block in bytes
379 * @return checksum value (0 to 255)
381 int cros_ec_calc_checksum(const uint8_t *data, int size);
384 * Decode a flash region parameter
386 * @param argc Number of params remaining
387 * @param argv List of remaining parameters
388 * @return flash region (EC_FLASH_REGION_...) or -1 on error
390 int cros_ec_decode_region(int argc, char * const argv[]);
392 int cros_ec_flash_erase(struct cros_ec_dev *dev, uint32_t offset,
396 * Read data from the flash
398 * Read an arbitrary amount of data from the EC flash, by repeatedly reading
401 * The offset starts at 0. You can obtain the region information from
402 * cros_ec_flash_offset() to find out where to read for a particular region.
404 * @param dev CROS-EC device
405 * @param data Pointer to data buffer to read into
406 * @param offset Offset within flash to read from
407 * @param size Number of bytes to read
408 * @return 0 if ok, -1 on error
410 int cros_ec_flash_read(struct cros_ec_dev *dev, uint8_t *data, uint32_t offset,
414 * Write data to the flash
416 * Write an arbitrary amount of data to the EC flash, by repeatedly writing
419 * The offset starts at 0. You can obtain the region information from
420 * cros_ec_flash_offset() to find out where to write for a particular region.
422 * Attempting to write to the region where the EC is currently running from
423 * will result in an error.
425 * @param dev CROS-EC device
426 * @param data Pointer to data buffer to write
427 * @param offset Offset within flash to write to.
428 * @param size Number of bytes to write
429 * @return 0 if ok, -1 on error
431 int cros_ec_flash_write(struct cros_ec_dev *dev, const uint8_t *data,
432 uint32_t offset, uint32_t size);
435 * Obtain position and size of a flash region
437 * @param dev CROS-EC device
438 * @param region Flash region to query
439 * @param offset Returns offset of flash region in EC flash
440 * @param size Returns size of flash region
441 * @return 0 if ok, -1 on error
443 int cros_ec_flash_offset(struct cros_ec_dev *dev, enum ec_flash_region region,
444 uint32_t *offset, uint32_t *size);
447 * Read/write VbNvContext from/to a CROS-EC device.
449 * @param dev CROS-EC device
450 * @param block Buffer of VbNvContext to be read/write
451 * @return 0 if ok, -1 on error
453 int cros_ec_read_vbnvcontext(struct cros_ec_dev *dev, uint8_t *block);
454 int cros_ec_write_vbnvcontext(struct cros_ec_dev *dev, const uint8_t *block);
457 * Read the version information for the EC images
459 * @param dev CROS-EC device
460 * @param versionp This is set to point to the version information
461 * @return 0 if ok, -1 on error
463 int cros_ec_read_version(struct cros_ec_dev *dev,
464 struct ec_response_get_version **versionp);
467 * Read the build information for the EC
469 * @param dev CROS-EC device
470 * @param versionp This is set to point to the build string
471 * @return 0 if ok, -1 on error
473 int cros_ec_read_build_info(struct cros_ec_dev *dev, char **strp);
476 * Switch on/off a LDO / FET.
478 * @param dev CROS-EC device
479 * @param index index of the LDO/FET to switch
480 * @param state new state of the LDO/FET : EC_LDO_STATE_ON|OFF
481 * @return 0 if ok, -1 on error
483 int cros_ec_set_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t state);
486 * Read back a LDO / FET current state.
488 * @param dev CROS-EC device
489 * @param index index of the LDO/FET to switch
490 * @param state current state of the LDO/FET : EC_LDO_STATE_ON|OFF
491 * @return 0 if ok, -1 on error
493 int cros_ec_get_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t *state);
496 * Initialize the Chrome OS EC at board initialization time.
498 * @return 0 if ok, -ve on error
500 int cros_ec_board_init(void);
503 * Get access to the error reported when cros_ec_board_init() was called
505 * This permits delayed reporting of the EC error if it failed during
508 * @return error (0 if there was no error, -ve if there was an error)
510 int cros_ec_get_error(void);
513 * Returns information from the FDT about the Chrome EC flash
515 * @param blob FDT blob to use
516 * @param node Node offset to read from
517 * @param config Structure to use to return information
519 int cros_ec_decode_ec_flash(const void *blob, int node,
520 struct fdt_cros_ec *config);
523 * Check the current keyboard state, in case recovery mode is requested.
524 * This function is for sandbox only.
526 * @param ec CROS-EC device
528 void cros_ec_check_keyboard(struct cros_ec_dev *dev);
531 * Tunnel an I2C transfer to the EC
533 * @param dev CROS-EC device
534 * @param chip Chip address (7-bit I2C address)
535 * @param addr Register address to read/write
536 * @param alen Length of register address in bytes
537 * @param buffer Buffer containing data to read/write
538 * @param len Length of buffer
539 * @param is_read 1 if this is a read, 0 if this is a write
541 int cros_ec_i2c_xfer(struct cros_ec_dev *dev, uchar chip, uint addr,
542 int alen, uchar *buffer, int len, int is_read);