xref: /openbmc/u-boot/include/cros_ec.h (revision 7237d22b)
1 /*
2  * Chromium OS cros_ec driver
3  *
4  * Copyright (c) 2012 The Chromium OS Authors.
5  *
6  * SPDX-License-Identifier:	GPL-2.0+
7  */
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>
16 
17 /* Which interface is the device on? */
18 enum cros_ec_interface_t {
19 	CROS_EC_IF_NONE,
20 	CROS_EC_IF_SPI,
21 	CROS_EC_IF_I2C,
22 	CROS_EC_IF_LPC,	/* Intel Low Pin Count interface */
23 	CROS_EC_IF_SANDBOX,
24 };
25 
26 /* Our configuration information */
27 struct cros_ec_dev {
28 	enum cros_ec_interface_t interface;
29 	struct spi_slave *spi;		/* Our SPI slave, if using SPI */
30 	int node;                       /* Our node */
31 	int parent_node;		/* Our parent node (interface) */
32 	unsigned int cs;		/* Our chip select */
33 	unsigned int addr;		/* Device address (for I2C) */
34 	unsigned int bus_num;		/* Bus number (for I2C) */
35 	unsigned int max_frequency;	/* Maximum interface frequency */
36 	struct fdt_gpio_state ec_int;	/* GPIO used as EC interrupt line */
37 	int protocol_version;           /* Protocol version to use */
38 	int optimise_flash_write;	/* Don't write erased flash blocks */
39 
40 	/*
41 	 * These two buffers will always be dword-aligned and include enough
42 	 * space for up to 7 word-alignment bytes also, so we can ensure that
43 	 * the body of the message is always dword-aligned (64-bit).
44 	 *
45 	 * We use this alignment to keep ARM and x86 happy. Probably word
46 	 * alignment would be OK, there might be a small performance advantage
47 	 * to using dword.
48 	 */
49 	uint8_t din[ALIGN(MSG_BYTES + sizeof(int64_t), sizeof(int64_t))]
50 		__aligned(sizeof(int64_t));
51 	uint8_t dout[ALIGN(MSG_BYTES + sizeof(int64_t), sizeof(int64_t))]
52 		__aligned(sizeof(int64_t));
53 };
54 
55 /*
56  * Hard-code the number of columns we happen to know we have right now.  It
57  * would be more correct to call cros_ec_info() at startup and determine the
58  * actual number of keyboard cols from there.
59  */
60 #define CROS_EC_KEYSCAN_COLS 13
61 
62 /* Information returned by a key scan */
63 struct mbkp_keyscan {
64 	uint8_t data[CROS_EC_KEYSCAN_COLS];
65 };
66 
67 /* Holds information about the Chrome EC */
68 struct fdt_cros_ec {
69 	struct fmap_entry flash;	/* Address and size of EC flash */
70 	/*
71 	 * Byte value of erased flash, or -1 if not known. It is normally
72 	 * 0xff but some flash devices use 0 (e.g. STM32Lxxx)
73 	 */
74 	int flash_erase_value;
75 	struct fmap_entry region[EC_FLASH_REGION_COUNT];
76 };
77 
78 /**
79  * Read the ID of the CROS-EC device
80  *
81  * The ID is a string identifying the CROS-EC device.
82  *
83  * @param dev		CROS-EC device
84  * @param id		Place to put the ID
85  * @param maxlen	Maximum length of the ID field
86  * @return 0 if ok, -1 on error
87  */
88 int cros_ec_read_id(struct cros_ec_dev *dev, char *id, int maxlen);
89 
90 /**
91  * Read a keyboard scan from the CROS-EC device
92  *
93  * Send a message requesting a keyboard scan and return the result
94  *
95  * @param dev		CROS-EC device
96  * @param scan		Place to put the scan results
97  * @return 0 if ok, -1 on error
98  */
99 int cros_ec_scan_keyboard(struct cros_ec_dev *dev, struct mbkp_keyscan *scan);
100 
101 /**
102  * Read which image is currently running on the CROS-EC device.
103  *
104  * @param dev		CROS-EC device
105  * @param image		Destination for image identifier
106  * @return 0 if ok, <0 on error
107  */
108 int cros_ec_read_current_image(struct cros_ec_dev *dev,
109 		enum ec_current_image *image);
110 
111 /**
112  * Read the hash of the CROS-EC device firmware.
113  *
114  * @param dev		CROS-EC device
115  * @param hash		Destination for hash information
116  * @return 0 if ok, <0 on error
117  */
118 int cros_ec_read_hash(struct cros_ec_dev *dev,
119 		struct ec_response_vboot_hash *hash);
120 
121 /**
122  * Send a reboot command to the CROS-EC device.
123  *
124  * Note that some reboot commands (such as EC_REBOOT_COLD) also reboot the AP.
125  *
126  * @param dev		CROS-EC device
127  * @param cmd		Reboot command
128  * @param flags         Flags for reboot command (EC_REBOOT_FLAG_*)
129  * @return 0 if ok, <0 on error
130  */
131 int cros_ec_reboot(struct cros_ec_dev *dev, enum ec_reboot_cmd cmd,
132 		uint8_t flags);
133 
134 /**
135  * Check if the CROS-EC device has an interrupt pending.
136  *
137  * Read the status of the external interrupt connected to the CROS-EC device.
138  * If no external interrupt is configured, this always returns 1.
139  *
140  * @param dev		CROS-EC device
141  * @return 0 if no interrupt is pending
142  */
143 int cros_ec_interrupt_pending(struct cros_ec_dev *dev);
144 
145 enum {
146 	CROS_EC_OK,
147 	CROS_EC_ERR = 1,
148 	CROS_EC_ERR_FDT_DECODE,
149 	CROS_EC_ERR_CHECK_VERSION,
150 	CROS_EC_ERR_READ_ID,
151 	CROS_EC_ERR_DEV_INIT,
152 };
153 
154 /**
155  * Initialise the Chromium OS EC driver
156  *
157  * @param blob		Device tree blob containing setup information
158  * @param cros_ecp        Returns pointer to the cros_ec device, or NULL if none
159  * @return 0 if we got an cros_ec device and all is well (or no cros_ec is
160  *	expected), -ve if we should have an cros_ec device but failed to find
161  *	one, or init failed (-CROS_EC_ERR_...).
162  */
163 int cros_ec_init(const void *blob, struct cros_ec_dev **cros_ecp);
164 
165 /**
166  * Read information about the keyboard matrix
167  *
168  * @param dev		CROS-EC device
169  * @param info		Place to put the info structure
170  */
171 int cros_ec_info(struct cros_ec_dev *dev,
172 		struct ec_response_mkbp_info *info);
173 
174 /**
175  * Read the host event flags
176  *
177  * @param dev		CROS-EC device
178  * @param events_ptr	Destination for event flags.  Not changed on error.
179  * @return 0 if ok, <0 on error
180  */
181 int cros_ec_get_host_events(struct cros_ec_dev *dev, uint32_t *events_ptr);
182 
183 /**
184  * Clear the specified host event flags
185  *
186  * @param dev		CROS-EC device
187  * @param events	Event flags to clear
188  * @return 0 if ok, <0 on error
189  */
190 int cros_ec_clear_host_events(struct cros_ec_dev *dev, uint32_t events);
191 
192 /**
193  * Get/set flash protection
194  *
195  * @param dev		CROS-EC device
196  * @param set_mask	Mask of flags to set; if 0, just retrieves existing
197  *                      protection state without changing it.
198  * @param set_flags	New flag values; only bits in set_mask are applied;
199  *                      ignored if set_mask=0.
200  * @param prot          Destination for updated protection state from EC.
201  * @return 0 if ok, <0 on error
202  */
203 int cros_ec_flash_protect(struct cros_ec_dev *dev,
204 		       uint32_t set_mask, uint32_t set_flags,
205 		       struct ec_response_flash_protect *resp);
206 
207 
208 /**
209  * Run internal tests on the cros_ec interface.
210  *
211  * @param dev		CROS-EC device
212  * @return 0 if ok, <0 if the test failed
213  */
214 int cros_ec_test(struct cros_ec_dev *dev);
215 
216 /**
217  * Update the EC RW copy.
218  *
219  * @param dev		CROS-EC device
220  * @param image		the content to write
221  * @param imafge_size	content length
222  * @return 0 if ok, <0 if the test failed
223  */
224 int cros_ec_flash_update_rw(struct cros_ec_dev *dev,
225 			 const uint8_t  *image, int image_size);
226 
227 /**
228  * Return a pointer to the board's CROS-EC device
229  *
230  * This should be implemented by board files.
231  *
232  * @return pointer to CROS-EC device, or NULL if none is available
233  */
234 struct cros_ec_dev *board_get_cros_ec_dev(void);
235 
236 
237 /* Internal interfaces */
238 int cros_ec_i2c_init(struct cros_ec_dev *dev, const void *blob);
239 int cros_ec_spi_init(struct cros_ec_dev *dev, const void *blob);
240 int cros_ec_lpc_init(struct cros_ec_dev *dev, const void *blob);
241 int cros_ec_sandbox_init(struct cros_ec_dev *dev, const void *blob);
242 
243 /**
244  * Read information from the fdt for the i2c cros_ec interface
245  *
246  * @param dev		CROS-EC device
247  * @param blob		Device tree blob
248  * @return 0 if ok, -1 if we failed to read all required information
249  */
250 int cros_ec_i2c_decode_fdt(struct cros_ec_dev *dev, const void *blob);
251 
252 /**
253  * Read information from the fdt for the spi cros_ec interface
254  *
255  * @param dev		CROS-EC device
256  * @param blob		Device tree blob
257  * @return 0 if ok, -1 if we failed to read all required information
258  */
259 int cros_ec_spi_decode_fdt(struct cros_ec_dev *dev, const void *blob);
260 
261 /**
262  * Read information from the fdt for the sandbox cros_ec interface
263  *
264  * @param dev		CROS-EC device
265  * @param blob		Device tree blob
266  * @return 0 if ok, -1 if we failed to read all required information
267  */
268 int cros_ec_sandbox_decode_fdt(struct cros_ec_dev *dev, const void *blob);
269 
270 /**
271  * Check whether the LPC interface supports new-style commands.
272  *
273  * LPC has its own way of doing this, which involves checking LPC values
274  * visible to the host. Do this, and update dev->protocol_version accordingly.
275  *
276  * @param dev		CROS-EC device to check
277  */
278 int cros_ec_lpc_check_version(struct cros_ec_dev *dev);
279 
280 /**
281  * Send a command to an I2C CROS-EC device and return the reply.
282  *
283  * This rather complicated function deals with sending both old-style and
284  * new-style commands. The old ones have just a command byte and arguments.
285  * The new ones have version, command, arg-len, [args], chksum so are 3 bytes
286  * longer.
287  *
288  * The device's internal input/output buffers are used.
289  *
290  * @param dev		CROS-EC device
291  * @param cmd		Command to send (EC_CMD_...)
292  * @param cmd_version	Version of command to send (EC_VER_...)
293  * @param dout          Output data (may be NULL If dout_len=0)
294  * @param dout_len      Size of output data in bytes
295  * @param dinp          Returns pointer to response data
296  * @param din_len       Maximum size of response in bytes
297  * @return number of bytes in response, or -1 on error
298  */
299 int cros_ec_i2c_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
300 		     const uint8_t *dout, int dout_len,
301 		     uint8_t **dinp, int din_len);
302 
303 /**
304  * Send a command to a LPC CROS-EC device and return the reply.
305  *
306  * The device's internal input/output buffers are used.
307  *
308  * @param dev		CROS-EC device
309  * @param cmd		Command to send (EC_CMD_...)
310  * @param cmd_version	Version of command to send (EC_VER_...)
311  * @param dout          Output data (may be NULL If dout_len=0)
312  * @param dout_len      Size of output data in bytes
313  * @param dinp          Returns pointer to response data
314  * @param din_len       Maximum size of response in bytes
315  * @return number of bytes in response, or -1 on error
316  */
317 int cros_ec_lpc_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
318 		     const uint8_t *dout, int dout_len,
319 		     uint8_t **dinp, int din_len);
320 
321 int cros_ec_spi_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
322 		     const uint8_t *dout, int dout_len,
323 		     uint8_t **dinp, int din_len);
324 
325 /**
326  * Send a packet to a CROS-EC device and return the response packet.
327  *
328  * Expects the request packet to be stored in dev->dout.  Stores the response
329  * packet in dev->din.
330  *
331  * @param dev		CROS-EC device
332  * @param out_bytes	Size of request packet to output
333  * @param in_bytes	Maximum size of response packet to receive
334  * @return number of bytes in response packet, or <0 on error
335  */
336 int cros_ec_spi_packet(struct cros_ec_dev *dev, int out_bytes, int in_bytes);
337 int cros_ec_sandbox_packet(struct cros_ec_dev *dev, int out_bytes,
338 			   int in_bytes);
339 
340 /**
341  * Dump a block of data for a command.
342  *
343  * @param name	Name for data (e.g. 'in', 'out')
344  * @param cmd	Command number associated with data, or -1 for none
345  * @param data	Data block to dump
346  * @param len	Length of data block to dump
347  */
348 void cros_ec_dump_data(const char *name, int cmd, const uint8_t *data, int len);
349 
350 /**
351  * Calculate a simple 8-bit checksum of a data block
352  *
353  * @param data	Data block to checksum
354  * @param size	Size of data block in bytes
355  * @return checksum value (0 to 255)
356  */
357 int cros_ec_calc_checksum(const uint8_t *data, int size);
358 
359 /**
360  * Decode a flash region parameter
361  *
362  * @param argc	Number of params remaining
363  * @param argv	List of remaining parameters
364  * @return flash region (EC_FLASH_REGION_...) or -1 on error
365  */
366 int cros_ec_decode_region(int argc, char * const argv[]);
367 
368 int cros_ec_flash_erase(struct cros_ec_dev *dev, uint32_t offset,
369 		uint32_t size);
370 
371 /**
372  * Read data from the flash
373  *
374  * Read an arbitrary amount of data from the EC flash, by repeatedly reading
375  * small blocks.
376  *
377  * The offset starts at 0. You can obtain the region information from
378  * cros_ec_flash_offset() to find out where to read for a particular region.
379  *
380  * @param dev		CROS-EC device
381  * @param data		Pointer to data buffer to read into
382  * @param offset	Offset within flash to read from
383  * @param size		Number of bytes to read
384  * @return 0 if ok, -1 on error
385  */
386 int cros_ec_flash_read(struct cros_ec_dev *dev, uint8_t *data, uint32_t offset,
387 		    uint32_t size);
388 
389 /**
390  * Write data to the flash
391  *
392  * Write an arbitrary amount of data to the EC flash, by repeatedly writing
393  * small blocks.
394  *
395  * The offset starts at 0. You can obtain the region information from
396  * cros_ec_flash_offset() to find out where to write for a particular region.
397  *
398  * Attempting to write to the region where the EC is currently running from
399  * will result in an error.
400  *
401  * @param dev		CROS-EC device
402  * @param data		Pointer to data buffer to write
403  * @param offset	Offset within flash to write to.
404  * @param size		Number of bytes to write
405  * @return 0 if ok, -1 on error
406  */
407 int cros_ec_flash_write(struct cros_ec_dev *dev, const uint8_t *data,
408 		     uint32_t offset, uint32_t size);
409 
410 /**
411  * Obtain position and size of a flash region
412  *
413  * @param dev		CROS-EC device
414  * @param region	Flash region to query
415  * @param offset	Returns offset of flash region in EC flash
416  * @param size		Returns size of flash region
417  * @return 0 if ok, -1 on error
418  */
419 int cros_ec_flash_offset(struct cros_ec_dev *dev, enum ec_flash_region region,
420 		      uint32_t *offset, uint32_t *size);
421 
422 /**
423  * Read/write VbNvContext from/to a CROS-EC device.
424  *
425  * @param dev		CROS-EC device
426  * @param block		Buffer of VbNvContext to be read/write
427  * @return 0 if ok, -1 on error
428  */
429 int cros_ec_read_vbnvcontext(struct cros_ec_dev *dev, uint8_t *block);
430 int cros_ec_write_vbnvcontext(struct cros_ec_dev *dev, const uint8_t *block);
431 
432 /**
433  * Read the version information for the EC images
434  *
435  * @param dev		CROS-EC device
436  * @param versionp	This is set to point to the version information
437  * @return 0 if ok, -1 on error
438  */
439 int cros_ec_read_version(struct cros_ec_dev *dev,
440 		       struct ec_response_get_version **versionp);
441 
442 /**
443  * Read the build information for the EC
444  *
445  * @param dev		CROS-EC device
446  * @param versionp	This is set to point to the build string
447  * @return 0 if ok, -1 on error
448  */
449 int cros_ec_read_build_info(struct cros_ec_dev *dev, char **strp);
450 
451 /**
452  * Switch on/off a LDO / FET.
453  *
454  * @param dev		CROS-EC device
455  * @param index		index of the LDO/FET to switch
456  * @param state		new state of the LDO/FET : EC_LDO_STATE_ON|OFF
457  * @return 0 if ok, -1 on error
458  */
459 int cros_ec_set_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t state);
460 
461 /**
462  * Read back a LDO / FET current state.
463  *
464  * @param dev		CROS-EC device
465  * @param index		index of the LDO/FET to switch
466  * @param state		current state of the LDO/FET : EC_LDO_STATE_ON|OFF
467  * @return 0 if ok, -1 on error
468  */
469 int cros_ec_get_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t *state);
470 
471 /**
472  * Initialize the Chrome OS EC at board initialization time.
473  *
474  * @return 0 if ok, -ve on error
475  */
476 int cros_ec_board_init(void);
477 
478 /**
479  * Get access to the error reported when cros_ec_board_init() was called
480  *
481  * This permits delayed reporting of the EC error if it failed during
482  * early init.
483  *
484  * @return error (0 if there was no error, -ve if there was an error)
485  */
486 int cros_ec_get_error(void);
487 
488 /**
489  * Returns information from the FDT about the Chrome EC flash
490  *
491  * @param blob		FDT blob to use
492  * @param config	Structure to use to return information
493  */
494 int cros_ec_decode_ec_flash(const void *blob, struct fdt_cros_ec *config);
495 
496 /**
497  * Check the current keyboard state, in case recovery mode is requested.
498  * This function is for sandbox only.
499  *
500  * @param ec		CROS-EC device
501  */
502 void cros_ec_check_keyboard(struct cros_ec_dev *dev);
503 
504 /*
505  * Tunnel an I2C transfer to the EC
506  *
507  * @param dev		CROS-EC device
508  * @param chip		Chip address (7-bit I2C address)
509  * @param addr		Register address to read/write
510  * @param alen		Length of register address in bytes
511  * @param buffer	Buffer containing data to read/write
512  * @param len		Length of buffer
513  * @param is_read	1 if this is a read, 0 if this is a write
514  */
515 int cros_ec_i2c_xfer(struct cros_ec_dev *dev, uchar chip, uint addr,
516 		     int alen, uchar *buffer, int len, int is_read);
517 
518 #endif
519