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 cros_ec_dev *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 * Read which image is currently running on the CROS-EC device.
88 * @param dev CROS-EC device
89 * @param image Destination for image identifier
90 * @return 0 if ok, <0 on error
92 int cros_ec_read_current_image(struct cros_ec_dev *dev,
93 enum ec_current_image *image);
96 * Read the hash of the CROS-EC device firmware.
98 * @param dev CROS-EC device
99 * @param hash Destination for hash information
100 * @return 0 if ok, <0 on error
102 int cros_ec_read_hash(struct cros_ec_dev *dev,
103 struct ec_response_vboot_hash *hash);
106 * Send a reboot command to the CROS-EC device.
108 * Note that some reboot commands (such as EC_REBOOT_COLD) also reboot the AP.
110 * @param dev CROS-EC device
111 * @param cmd Reboot command
112 * @param flags Flags for reboot command (EC_REBOOT_FLAG_*)
113 * @return 0 if ok, <0 on error
115 int cros_ec_reboot(struct cros_ec_dev *dev, enum ec_reboot_cmd cmd,
119 * Check if the CROS-EC device has an interrupt pending.
121 * Read the status of the external interrupt connected to the CROS-EC device.
122 * If no external interrupt is configured, this always returns 1.
124 * @param dev CROS-EC device
125 * @return 0 if no interrupt is pending
127 int cros_ec_interrupt_pending(struct udevice *dev);
132 CROS_EC_ERR_FDT_DECODE,
133 CROS_EC_ERR_CHECK_VERSION,
135 CROS_EC_ERR_DEV_INIT,
139 * Initialise the Chromium OS EC driver
141 * @param blob Device tree blob containing setup information
142 * @param cros_ecp Returns pointer to the cros_ec device, or NULL if none
143 * @return 0 if we got an cros_ec device and all is well (or no cros_ec is
144 * expected), -ve if we should have an cros_ec device but failed to find
145 * one, or init failed (-CROS_EC_ERR_...).
147 int cros_ec_init(const void *blob, struct cros_ec_dev **cros_ecp);
150 * Read information about the keyboard matrix
152 * @param dev CROS-EC device
153 * @param info Place to put the info structure
155 int cros_ec_info(struct cros_ec_dev *dev,
156 struct ec_response_mkbp_info *info);
159 * Read the host event flags
161 * @param dev CROS-EC device
162 * @param events_ptr Destination for event flags. Not changed on error.
163 * @return 0 if ok, <0 on error
165 int cros_ec_get_host_events(struct cros_ec_dev *dev, uint32_t *events_ptr);
168 * Clear the specified host event flags
170 * @param dev CROS-EC device
171 * @param events Event flags to clear
172 * @return 0 if ok, <0 on error
174 int cros_ec_clear_host_events(struct cros_ec_dev *dev, uint32_t events);
177 * Get/set flash protection
179 * @param dev CROS-EC device
180 * @param set_mask Mask of flags to set; if 0, just retrieves existing
181 * protection state without changing it.
182 * @param set_flags New flag values; only bits in set_mask are applied;
183 * ignored if set_mask=0.
184 * @param prot Destination for updated protection state from EC.
185 * @return 0 if ok, <0 on error
187 int cros_ec_flash_protect(struct cros_ec_dev *dev,
188 uint32_t set_mask, uint32_t set_flags,
189 struct ec_response_flash_protect *resp);
193 * Run internal tests on the cros_ec interface.
195 * @param dev CROS-EC device
196 * @return 0 if ok, <0 if the test failed
198 int cros_ec_test(struct cros_ec_dev *dev);
201 * Update the EC RW copy.
203 * @param dev CROS-EC device
204 * @param image the content to write
205 * @param imafge_size content length
206 * @return 0 if ok, <0 if the test failed
208 int cros_ec_flash_update_rw(struct cros_ec_dev *dev,
209 const uint8_t *image, int image_size);
212 * Return a pointer to the board's CROS-EC device
214 * This should be implemented by board files.
216 * @return pointer to CROS-EC device, or NULL if none is available
218 struct cros_ec_dev *board_get_cros_ec_dev(void);
220 struct dm_cros_ec_ops {
221 int (*check_version)(struct udevice *dev);
222 int (*command)(struct udevice *dev, uint8_t cmd, int cmd_version,
223 const uint8_t *dout, int dout_len,
224 uint8_t **dinp, int din_len);
225 int (*packet)(struct udevice *dev, int out_bytes, int in_bytes);
228 #define dm_cros_ec_get_ops(dev) \
229 ((struct dm_cros_ec_ops *)(dev)->driver->ops)
231 int cros_ec_register(struct udevice *dev);
234 * Dump a block of data for a command.
236 * @param name Name for data (e.g. 'in', 'out')
237 * @param cmd Command number associated with data, or -1 for none
238 * @param data Data block to dump
239 * @param len Length of data block to dump
241 void cros_ec_dump_data(const char *name, int cmd, const uint8_t *data, int len);
244 * Calculate a simple 8-bit checksum of a data block
246 * @param data Data block to checksum
247 * @param size Size of data block in bytes
248 * @return checksum value (0 to 255)
250 int cros_ec_calc_checksum(const uint8_t *data, int size);
252 int cros_ec_flash_erase(struct cros_ec_dev *dev, uint32_t offset,
256 * Read data from the flash
258 * Read an arbitrary amount of data from the EC flash, by repeatedly reading
261 * The offset starts at 0. You can obtain the region information from
262 * cros_ec_flash_offset() to find out where to read for a particular region.
264 * @param dev CROS-EC device
265 * @param data Pointer to data buffer to read into
266 * @param offset Offset within flash to read from
267 * @param size Number of bytes to read
268 * @return 0 if ok, -1 on error
270 int cros_ec_flash_read(struct cros_ec_dev *dev, uint8_t *data, uint32_t offset,
274 * Read back flash parameters
276 * This function reads back parameters of the flash as reported by the EC
278 * @param dev Pointer to device
279 * @param info Pointer to output flash info struct
281 int cros_ec_read_flashinfo(struct cros_ec_dev *dev,
282 struct ec_response_flash_info *info);
285 * Write data to the flash
287 * Write an arbitrary amount of data to the EC flash, by repeatedly writing
290 * The offset starts at 0. You can obtain the region information from
291 * cros_ec_flash_offset() to find out where to write for a particular region.
293 * Attempting to write to the region where the EC is currently running from
294 * will result in an error.
296 * @param dev CROS-EC device
297 * @param data Pointer to data buffer to write
298 * @param offset Offset within flash to write to.
299 * @param size Number of bytes to write
300 * @return 0 if ok, -1 on error
302 int cros_ec_flash_write(struct cros_ec_dev *dev, const uint8_t *data,
303 uint32_t offset, uint32_t size);
306 * Obtain position and size of a flash region
308 * @param dev CROS-EC device
309 * @param region Flash region to query
310 * @param offset Returns offset of flash region in EC flash
311 * @param size Returns size of flash region
312 * @return 0 if ok, -1 on error
314 int cros_ec_flash_offset(struct cros_ec_dev *dev, enum ec_flash_region region,
315 uint32_t *offset, uint32_t *size);
318 * Read/write VbNvContext from/to a CROS-EC device.
320 * @param dev CROS-EC device
321 * @param block Buffer of VbNvContext to be read/write
322 * @return 0 if ok, -1 on error
324 int cros_ec_read_vbnvcontext(struct cros_ec_dev *dev, uint8_t *block);
325 int cros_ec_write_vbnvcontext(struct cros_ec_dev *dev, const uint8_t *block);
328 * Read the version information for the EC images
330 * @param dev CROS-EC device
331 * @param versionp This is set to point to the version information
332 * @return 0 if ok, -1 on error
334 int cros_ec_read_version(struct cros_ec_dev *dev,
335 struct ec_response_get_version **versionp);
338 * Read the build information for the EC
340 * @param dev CROS-EC device
341 * @param versionp This is set to point to the build string
342 * @return 0 if ok, -1 on error
344 int cros_ec_read_build_info(struct cros_ec_dev *dev, char **strp);
347 * Switch on/off a LDO / FET.
349 * @param dev CROS-EC device
350 * @param index index of the LDO/FET to switch
351 * @param state new state of the LDO/FET : EC_LDO_STATE_ON|OFF
352 * @return 0 if ok, -1 on error
354 int cros_ec_set_ldo(struct udevice *dev, uint8_t index, uint8_t state);
357 * Read back a LDO / FET current state.
359 * @param dev CROS-EC device
360 * @param index index of the LDO/FET to switch
361 * @param state current state of the LDO/FET : EC_LDO_STATE_ON|OFF
362 * @return 0 if ok, -1 on error
364 int cros_ec_get_ldo(struct udevice *dev, uint8_t index, uint8_t *state);
367 * Get access to the error reported when cros_ec_board_init() was called
369 * This permits delayed reporting of the EC error if it failed during
372 * @return error (0 if there was no error, -ve if there was an error)
374 int cros_ec_get_error(void);
377 * Returns information from the FDT about the Chrome EC flash
379 * @param dev Device to read from
380 * @param config Structure to use to return information
382 int cros_ec_decode_ec_flash(struct udevice *dev, struct fdt_cros_ec *config);
385 * Check the current keyboard state, in case recovery mode is requested.
386 * This function is for sandbox only.
388 * @param ec CROS-EC device
390 void cros_ec_check_keyboard(struct cros_ec_dev *dev);
394 * Tunnel an I2C transfer to the EC
396 * @param dev CROS-EC device
397 * @param port The remote port on EC to use
398 * @param msg List of messages to transfer
399 * @param nmsgs Number of messages to transfer
401 int cros_ec_i2c_tunnel(struct udevice *dev, int port, struct i2c_msg *msg,