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 * 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 udevice *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_offset Offset in flash to read from
100 * @param hash Destination for hash information
101 * @return 0 if ok, <0 on error
103 int cros_ec_read_hash(struct udevice *dev, uint hash_offset,
104 struct ec_response_vboot_hash *hash);
107 * Send a reboot command to the CROS-EC device.
109 * Note that some reboot commands (such as EC_REBOOT_COLD) also reboot the AP.
111 * @param dev CROS-EC device
112 * @param cmd Reboot command
113 * @param flags Flags for reboot command (EC_REBOOT_FLAG_*)
114 * @return 0 if ok, <0 on error
116 int cros_ec_reboot(struct udevice *dev, enum ec_reboot_cmd cmd, uint8_t flags);
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 udevice**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 udevice *dev, struct ec_response_mkbp_info *info);
158 * Read the host event flags
160 * @param dev CROS-EC device
161 * @param events_ptr Destination for event flags. Not changed on error.
162 * @return 0 if ok, <0 on error
164 int cros_ec_get_host_events(struct udevice *dev, uint32_t *events_ptr);
167 * Clear the specified host event flags
169 * @param dev CROS-EC device
170 * @param events Event flags to clear
171 * @return 0 if ok, <0 on error
173 int cros_ec_clear_host_events(struct udevice *dev, uint32_t events);
176 * Get/set flash protection
178 * @param dev CROS-EC device
179 * @param set_mask Mask of flags to set; if 0, just retrieves existing
180 * protection state without changing it.
181 * @param set_flags New flag values; only bits in set_mask are applied;
182 * ignored if set_mask=0.
183 * @param prot Destination for updated protection state from EC.
184 * @return 0 if ok, <0 on error
186 int cros_ec_flash_protect(struct udevice *dev, uint32_t set_mask,
188 struct ec_response_flash_protect *resp);
192 * Run internal tests on the cros_ec interface.
194 * @param dev CROS-EC device
195 * @return 0 if ok, <0 if the test failed
197 int cros_ec_test(struct udevice *dev);
200 * Update the EC RW copy.
202 * @param dev CROS-EC device
203 * @param image the content to write
204 * @param imafge_size content length
205 * @return 0 if ok, <0 if the test failed
207 int cros_ec_flash_update_rw(struct udevice *dev, const uint8_t *image,
211 * Return a pointer to the board's CROS-EC device
213 * @return pointer to CROS-EC device, or NULL if none is available
215 struct udevice *board_get_cros_ec_dev(void);
217 struct dm_cros_ec_ops {
218 int (*check_version)(struct udevice *dev);
219 int (*command)(struct udevice *dev, uint8_t cmd, int cmd_version,
220 const uint8_t *dout, int dout_len,
221 uint8_t **dinp, int din_len);
222 int (*packet)(struct udevice *dev, int out_bytes, int in_bytes);
225 #define dm_cros_ec_get_ops(dev) \
226 ((struct dm_cros_ec_ops *)(dev)->driver->ops)
228 int cros_ec_register(struct udevice *dev);
231 * Dump a block of data for a command.
233 * @param name Name for data (e.g. 'in', 'out')
234 * @param cmd Command number associated with data, or -1 for none
235 * @param data Data block to dump
236 * @param len Length of data block to dump
238 void cros_ec_dump_data(const char *name, int cmd, const uint8_t *data, int len);
241 * Calculate a simple 8-bit checksum of a data block
243 * @param data Data block to checksum
244 * @param size Size of data block in bytes
245 * @return checksum value (0 to 255)
247 int cros_ec_calc_checksum(const uint8_t *data, int size);
249 int cros_ec_flash_erase(struct udevice *dev, uint32_t offset, uint32_t size);
252 * Read data from the flash
254 * Read an arbitrary amount of data from the EC flash, by repeatedly reading
257 * The offset starts at 0. You can obtain the region information from
258 * cros_ec_flash_offset() to find out where to read for a particular region.
260 * @param dev CROS-EC device
261 * @param data Pointer to data buffer to read into
262 * @param offset Offset within flash to read from
263 * @param size Number of bytes to read
264 * @return 0 if ok, -1 on error
266 int cros_ec_flash_read(struct udevice *dev, uint8_t *data, uint32_t offset,
270 * Read back flash parameters
272 * This function reads back parameters of the flash as reported by the EC
274 * @param dev Pointer to device
275 * @param info Pointer to output flash info struct
277 int cros_ec_read_flashinfo(struct udevice *dev,
278 struct ec_response_flash_info *info);
281 * Write data to the flash
283 * Write an arbitrary amount of data to the EC flash, by repeatedly writing
286 * The offset starts at 0. You can obtain the region information from
287 * cros_ec_flash_offset() to find out where to write for a particular region.
289 * Attempting to write to the region where the EC is currently running from
290 * will result in an error.
292 * @param dev CROS-EC device
293 * @param data Pointer to data buffer to write
294 * @param offset Offset within flash to write to.
295 * @param size Number of bytes to write
296 * @return 0 if ok, -1 on error
298 int cros_ec_flash_write(struct udevice *dev, const uint8_t *data,
299 uint32_t offset, uint32_t size);
302 * Obtain position and size of a flash region
304 * @param dev CROS-EC device
305 * @param region Flash region to query
306 * @param offset Returns offset of flash region in EC flash
307 * @param size Returns size of flash region
308 * @return 0 if ok, -1 on error
310 int cros_ec_flash_offset(struct udevice *dev, enum ec_flash_region region,
311 uint32_t *offset, uint32_t *size);
314 * Read/write non-volatile data from/to a CROS-EC device.
316 * @param dev CROS-EC device
317 * @param block Buffer of VbNvContext to be read/write
318 * @return 0 if ok, -1 on error
320 int cros_ec_read_nvdata(struct udevice *dev, uint8_t *block, int size);
321 int cros_ec_write_nvdata(struct udevice *dev, const uint8_t *block, int size);
324 * Read the version information for the EC images
326 * @param dev CROS-EC device
327 * @param versionp This is set to point to the version information
328 * @return 0 if ok, -1 on error
330 int cros_ec_read_version(struct udevice *dev,
331 struct ec_response_get_version **versionp);
334 * Read the build information for the EC
336 * @param dev CROS-EC device
337 * @param versionp This is set to point to the build string
338 * @return 0 if ok, -1 on error
340 int cros_ec_read_build_info(struct udevice *dev, char **strp);
343 * Switch on/off a LDO / FET.
345 * @param dev CROS-EC device
346 * @param index index of the LDO/FET to switch
347 * @param state new state of the LDO/FET : EC_LDO_STATE_ON|OFF
348 * @return 0 if ok, -1 on error
350 int cros_ec_set_ldo(struct udevice *dev, uint8_t index, uint8_t state);
353 * Read back a LDO / FET current state.
355 * @param dev CROS-EC device
356 * @param index index of the LDO/FET to switch
357 * @param state current state of the LDO/FET : EC_LDO_STATE_ON|OFF
358 * @return 0 if ok, -1 on error
360 int cros_ec_get_ldo(struct udevice *dev, uint8_t index, uint8_t *state);
363 * Get access to the error reported when cros_ec_board_init() was called
365 * This permits delayed reporting of the EC error if it failed during
368 * @return error (0 if there was no error, -ve if there was an error)
370 int cros_ec_get_error(void);
373 * Returns information from the FDT about the Chrome EC flash
375 * @param dev Device to read from
376 * @param config Structure to use to return information
378 int cros_ec_decode_ec_flash(struct udevice *dev, struct fdt_cros_ec *config);
381 * Check the current keyboard state, in case recovery mode is requested.
382 * This function is for sandbox only.
384 * @param ec CROS-EC device
386 void cros_ec_check_keyboard(struct udevice *dev);
390 * Tunnel an I2C transfer to the EC
392 * @param dev CROS-EC device
393 * @param port The remote port on EC to use
394 * @param msg List of messages to transfer
395 * @param nmsgs Number of messages to transfer
397 int cros_ec_i2c_tunnel(struct udevice *dev, int port, struct i2c_msg *msg,