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Hung-ying Tyan88364382013-05-15 18:27:28 +08001/*
2 * Chromium OS cros_ec driver
3 *
4 * Copyright (c) 2012 The Chromium OS Authors.
Hung-ying Tyan88364382013-05-15 18:27:28 +08005 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02006 * SPDX-License-Identifier: GPL-2.0+
Hung-ying Tyan88364382013-05-15 18:27:28 +08007 */
8
9#ifndef _CROS_EC_H
10#define _CROS_EC_H
11
12#include <linux/compiler.h>
13#include <ec_commands.h>
14#include <fdtdec.h>
15#include <cros_ec_message.h>
Simon Glass32f8a192015-01-05 20:05:32 -070016#include <asm/gpio.h>
Hung-ying Tyan88364382013-05-15 18:27:28 +080017
Hung-ying Tyan88364382013-05-15 18:27:28 +080018/* Our configuration information */
19struct cros_ec_dev {
Simon Glass84d6cbd2014-10-13 23:42:14 -060020 struct udevice *dev; /* Transport device */
Simon Glass32f8a192015-01-05 20:05:32 -070021 struct gpio_desc ec_int; /* GPIO used as EC interrupt line */
Randall Spanglere8c12662014-02-27 13:26:08 -070022 int protocol_version; /* Protocol version to use */
Hung-ying Tyan88364382013-05-15 18:27:28 +080023 int optimise_flash_write; /* Don't write erased flash blocks */
24
25 /*
26 * These two buffers will always be dword-aligned and include enough
27 * space for up to 7 word-alignment bytes also, so we can ensure that
28 * the body of the message is always dword-aligned (64-bit).
29 *
30 * We use this alignment to keep ARM and x86 happy. Probably word
31 * alignment would be OK, there might be a small performance advantage
32 * to using dword.
33 */
34 uint8_t din[ALIGN(MSG_BYTES + sizeof(int64_t), sizeof(int64_t))]
35 __aligned(sizeof(int64_t));
36 uint8_t dout[ALIGN(MSG_BYTES + sizeof(int64_t), sizeof(int64_t))]
37 __aligned(sizeof(int64_t));
38};
39
40/*
41 * Hard-code the number of columns we happen to know we have right now. It
42 * would be more correct to call cros_ec_info() at startup and determine the
43 * actual number of keyboard cols from there.
44 */
45#define CROS_EC_KEYSCAN_COLS 13
46
47/* Information returned by a key scan */
48struct mbkp_keyscan {
49 uint8_t data[CROS_EC_KEYSCAN_COLS];
50};
51
Simon Glassd7f25f32014-02-27 13:26:03 -070052/* Holds information about the Chrome EC */
53struct fdt_cros_ec {
54 struct fmap_entry flash; /* Address and size of EC flash */
55 /*
56 * Byte value of erased flash, or -1 if not known. It is normally
57 * 0xff but some flash devices use 0 (e.g. STM32Lxxx)
58 */
59 int flash_erase_value;
60 struct fmap_entry region[EC_FLASH_REGION_COUNT];
61};
62
Hung-ying Tyan88364382013-05-15 18:27:28 +080063/**
64 * Read the ID of the CROS-EC device
65 *
66 * The ID is a string identifying the CROS-EC device.
67 *
68 * @param dev CROS-EC device
69 * @param id Place to put the ID
70 * @param maxlen Maximum length of the ID field
71 * @return 0 if ok, -1 on error
72 */
73int cros_ec_read_id(struct cros_ec_dev *dev, char *id, int maxlen);
74
75/**
76 * Read a keyboard scan from the CROS-EC device
77 *
78 * Send a message requesting a keyboard scan and return the result
79 *
80 * @param dev CROS-EC device
81 * @param scan Place to put the scan results
82 * @return 0 if ok, -1 on error
83 */
Simon Glass745009c2015-10-18 21:17:14 -060084int cros_ec_scan_keyboard(struct udevice *dev, struct mbkp_keyscan *scan);
Hung-ying Tyan88364382013-05-15 18:27:28 +080085
86/**
87 * Read which image is currently running on the CROS-EC device.
88 *
89 * @param dev CROS-EC device
90 * @param image Destination for image identifier
91 * @return 0 if ok, <0 on error
92 */
93int cros_ec_read_current_image(struct cros_ec_dev *dev,
94 enum ec_current_image *image);
95
96/**
97 * Read the hash of the CROS-EC device firmware.
98 *
99 * @param dev CROS-EC device
100 * @param hash Destination for hash information
101 * @return 0 if ok, <0 on error
102 */
103int cros_ec_read_hash(struct cros_ec_dev *dev,
104 struct ec_response_vboot_hash *hash);
105
106/**
107 * Send a reboot command to the CROS-EC device.
108 *
109 * Note that some reboot commands (such as EC_REBOOT_COLD) also reboot the AP.
110 *
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
115 */
116int cros_ec_reboot(struct cros_ec_dev *dev, enum ec_reboot_cmd cmd,
117 uint8_t flags);
118
119/**
120 * Check if the CROS-EC device has an interrupt pending.
121 *
122 * Read the status of the external interrupt connected to the CROS-EC device.
123 * If no external interrupt is configured, this always returns 1.
124 *
125 * @param dev CROS-EC device
126 * @return 0 if no interrupt is pending
127 */
Simon Glass745009c2015-10-18 21:17:14 -0600128int cros_ec_interrupt_pending(struct udevice *dev);
Hung-ying Tyan88364382013-05-15 18:27:28 +0800129
130enum {
131 CROS_EC_OK,
132 CROS_EC_ERR = 1,
133 CROS_EC_ERR_FDT_DECODE,
134 CROS_EC_ERR_CHECK_VERSION,
135 CROS_EC_ERR_READ_ID,
136 CROS_EC_ERR_DEV_INIT,
137};
138
139/**
Simon Glass836bb6e2014-02-27 13:26:07 -0700140 * Initialise the Chromium OS EC driver
Hung-ying Tyan88364382013-05-15 18:27:28 +0800141 *
142 * @param blob Device tree blob containing setup information
143 * @param cros_ecp Returns pointer to the cros_ec device, or NULL if none
144 * @return 0 if we got an cros_ec device and all is well (or no cros_ec is
145 * expected), -ve if we should have an cros_ec device but failed to find
146 * one, or init failed (-CROS_EC_ERR_...).
147 */
148int cros_ec_init(const void *blob, struct cros_ec_dev **cros_ecp);
149
150/**
151 * Read information about the keyboard matrix
152 *
153 * @param dev CROS-EC device
154 * @param info Place to put the info structure
155 */
156int cros_ec_info(struct cros_ec_dev *dev,
Simon Glass836bb6e2014-02-27 13:26:07 -0700157 struct ec_response_mkbp_info *info);
Hung-ying Tyan88364382013-05-15 18:27:28 +0800158
159/**
160 * Read the host event flags
161 *
162 * @param dev CROS-EC device
163 * @param events_ptr Destination for event flags. Not changed on error.
164 * @return 0 if ok, <0 on error
165 */
166int cros_ec_get_host_events(struct cros_ec_dev *dev, uint32_t *events_ptr);
167
168/**
169 * Clear the specified host event flags
170 *
171 * @param dev CROS-EC device
172 * @param events Event flags to clear
173 * @return 0 if ok, <0 on error
174 */
175int cros_ec_clear_host_events(struct cros_ec_dev *dev, uint32_t events);
176
177/**
178 * Get/set flash protection
179 *
180 * @param dev CROS-EC device
181 * @param set_mask Mask of flags to set; if 0, just retrieves existing
182 * protection state without changing it.
183 * @param set_flags New flag values; only bits in set_mask are applied;
184 * ignored if set_mask=0.
185 * @param prot Destination for updated protection state from EC.
186 * @return 0 if ok, <0 on error
187 */
188int cros_ec_flash_protect(struct cros_ec_dev *dev,
189 uint32_t set_mask, uint32_t set_flags,
190 struct ec_response_flash_protect *resp);
191
192
193/**
194 * Run internal tests on the cros_ec interface.
195 *
196 * @param dev CROS-EC device
197 * @return 0 if ok, <0 if the test failed
198 */
199int cros_ec_test(struct cros_ec_dev *dev);
200
201/**
202 * Update the EC RW copy.
203 *
204 * @param dev CROS-EC device
205 * @param image the content to write
206 * @param imafge_size content length
207 * @return 0 if ok, <0 if the test failed
208 */
209int cros_ec_flash_update_rw(struct cros_ec_dev *dev,
210 const uint8_t *image, int image_size);
211
212/**
213 * Return a pointer to the board's CROS-EC device
214 *
215 * This should be implemented by board files.
216 *
217 * @return pointer to CROS-EC device, or NULL if none is available
218 */
219struct cros_ec_dev *board_get_cros_ec_dev(void);
220
Simon Glass84d6cbd2014-10-13 23:42:14 -0600221struct dm_cros_ec_ops {
222 int (*check_version)(struct udevice *dev);
223 int (*command)(struct udevice *dev, uint8_t cmd, int cmd_version,
224 const uint8_t *dout, int dout_len,
225 uint8_t **dinp, int din_len);
226 int (*packet)(struct udevice *dev, int out_bytes, int in_bytes);
227};
228
229#define dm_cros_ec_get_ops(dev) \
230 ((struct dm_cros_ec_ops *)(dev)->driver->ops)
231
232int cros_ec_register(struct udevice *dev);
233
Randall Spanglera6070282014-02-27 13:26:10 -0700234/**
Hung-ying Tyan88364382013-05-15 18:27:28 +0800235 * Dump a block of data for a command.
236 *
237 * @param name Name for data (e.g. 'in', 'out')
238 * @param cmd Command number associated with data, or -1 for none
239 * @param data Data block to dump
240 * @param len Length of data block to dump
241 */
242void cros_ec_dump_data(const char *name, int cmd, const uint8_t *data, int len);
243
244/**
245 * Calculate a simple 8-bit checksum of a data block
246 *
247 * @param data Data block to checksum
248 * @param size Size of data block in bytes
249 * @return checksum value (0 to 255)
250 */
251int cros_ec_calc_checksum(const uint8_t *data, int size);
252
253/**
254 * Decode a flash region parameter
255 *
256 * @param argc Number of params remaining
257 * @param argv List of remaining parameters
258 * @return flash region (EC_FLASH_REGION_...) or -1 on error
259 */
260int cros_ec_decode_region(int argc, char * const argv[]);
261
262int cros_ec_flash_erase(struct cros_ec_dev *dev, uint32_t offset,
263 uint32_t size);
264
265/**
266 * Read data from the flash
267 *
268 * Read an arbitrary amount of data from the EC flash, by repeatedly reading
269 * small blocks.
270 *
271 * The offset starts at 0. You can obtain the region information from
272 * cros_ec_flash_offset() to find out where to read for a particular region.
273 *
274 * @param dev CROS-EC device
275 * @param data Pointer to data buffer to read into
276 * @param offset Offset within flash to read from
277 * @param size Number of bytes to read
278 * @return 0 if ok, -1 on error
279 */
280int cros_ec_flash_read(struct cros_ec_dev *dev, uint8_t *data, uint32_t offset,
281 uint32_t size);
282
283/**
Moritz Fischerbfeba012016-10-04 17:08:08 -0700284 * Read back flash parameters
285 *
286 * This function reads back parameters of the flash as reported by the EC
287 *
288 * @param dev Pointer to device
289 * @param info Pointer to output flash info struct
290 */
291int cros_ec_read_flashinfo(struct cros_ec_dev *dev,
292 struct ec_response_flash_info *info);
293
294/**
Hung-ying Tyan88364382013-05-15 18:27:28 +0800295 * Write data to the flash
296 *
297 * Write an arbitrary amount of data to the EC flash, by repeatedly writing
298 * small blocks.
299 *
300 * The offset starts at 0. You can obtain the region information from
301 * cros_ec_flash_offset() to find out where to write for a particular region.
302 *
303 * Attempting to write to the region where the EC is currently running from
304 * will result in an error.
305 *
306 * @param dev CROS-EC device
307 * @param data Pointer to data buffer to write
308 * @param offset Offset within flash to write to.
309 * @param size Number of bytes to write
310 * @return 0 if ok, -1 on error
311 */
312int cros_ec_flash_write(struct cros_ec_dev *dev, const uint8_t *data,
313 uint32_t offset, uint32_t size);
314
315/**
316 * Obtain position and size of a flash region
317 *
318 * @param dev CROS-EC device
319 * @param region Flash region to query
320 * @param offset Returns offset of flash region in EC flash
321 * @param size Returns size of flash region
322 * @return 0 if ok, -1 on error
323 */
324int cros_ec_flash_offset(struct cros_ec_dev *dev, enum ec_flash_region region,
325 uint32_t *offset, uint32_t *size);
326
327/**
328 * Read/write VbNvContext from/to a CROS-EC device.
329 *
330 * @param dev CROS-EC device
331 * @param block Buffer of VbNvContext to be read/write
332 * @return 0 if ok, -1 on error
333 */
334int cros_ec_read_vbnvcontext(struct cros_ec_dev *dev, uint8_t *block);
335int cros_ec_write_vbnvcontext(struct cros_ec_dev *dev, const uint8_t *block);
336
337/**
338 * Read the version information for the EC images
339 *
340 * @param dev CROS-EC device
341 * @param versionp This is set to point to the version information
342 * @return 0 if ok, -1 on error
343 */
344int cros_ec_read_version(struct cros_ec_dev *dev,
345 struct ec_response_get_version **versionp);
346
347/**
348 * Read the build information for the EC
349 *
350 * @param dev CROS-EC device
351 * @param versionp This is set to point to the build string
352 * @return 0 if ok, -1 on error
353 */
354int cros_ec_read_build_info(struct cros_ec_dev *dev, char **strp);
355
356/**
357 * Switch on/off a LDO / FET.
358 *
359 * @param dev CROS-EC device
360 * @param index index of the LDO/FET to switch
361 * @param state new state of the LDO/FET : EC_LDO_STATE_ON|OFF
362 * @return 0 if ok, -1 on error
363 */
Simon Glassf48eaf02015-08-03 08:19:24 -0600364int cros_ec_set_ldo(struct udevice *dev, uint8_t index, uint8_t state);
Hung-ying Tyan88364382013-05-15 18:27:28 +0800365
366/**
367 * Read back a LDO / FET current state.
368 *
369 * @param dev CROS-EC device
370 * @param index index of the LDO/FET to switch
371 * @param state current state of the LDO/FET : EC_LDO_STATE_ON|OFF
372 * @return 0 if ok, -1 on error
373 */
Simon Glassf48eaf02015-08-03 08:19:24 -0600374int cros_ec_get_ldo(struct udevice *dev, uint8_t index, uint8_t *state);
Vadim Bendebury41364f02014-02-27 13:26:02 -0700375
376/**
Vadim Bendebury41364f02014-02-27 13:26:02 -0700377 * Get access to the error reported when cros_ec_board_init() was called
378 *
379 * This permits delayed reporting of the EC error if it failed during
380 * early init.
381 *
382 * @return error (0 if there was no error, -ve if there was an error)
383 */
384int cros_ec_get_error(void);
385
Simon Glassd7f25f32014-02-27 13:26:03 -0700386/**
387 * Returns information from the FDT about the Chrome EC flash
388 *
389 * @param blob FDT blob to use
Simon Glass84d6cbd2014-10-13 23:42:14 -0600390 * @param node Node offset to read from
Simon Glassd7f25f32014-02-27 13:26:03 -0700391 * @param config Structure to use to return information
392 */
Simon Glass84d6cbd2014-10-13 23:42:14 -0600393int cros_ec_decode_ec_flash(const void *blob, int node,
394 struct fdt_cros_ec *config);
Simon Glassd7f25f32014-02-27 13:26:03 -0700395
Simon Glassdf93d902014-02-27 13:26:12 -0700396/**
397 * Check the current keyboard state, in case recovery mode is requested.
398 * This function is for sandbox only.
399 *
400 * @param ec CROS-EC device
401 */
402void cros_ec_check_keyboard(struct cros_ec_dev *dev);
403
Simon Glasscc456bd2015-08-03 08:19:23 -0600404struct i2c_msg;
405/*
406 * Tunnel an I2C transfer to the EC
407 *
408 * @param dev CROS-EC device
Moritz Fischer6d1a7182016-09-27 15:42:07 -0700409 * @param port The remote port on EC to use
Simon Glasscc456bd2015-08-03 08:19:23 -0600410 * @param msg List of messages to transfer
411 * @param nmsgs Number of messages to transfer
412 */
Moritz Fischer6d1a7182016-09-27 15:42:07 -0700413int cros_ec_i2c_tunnel(struct udevice *dev, int port, struct i2c_msg *msg,
414 int nmsgs);
Simon Glasscc456bd2015-08-03 08:19:23 -0600415
Hung-ying Tyan88364382013-05-15 18:27:28 +0800416#endif