24  * Ultimately it shold be possible to connect an Chrome OS EC emulation
32  * into key scan data, passed back from the EC as key scan messages. The
37  * 3. Save/restore of EC state, so that the vboot context, flash memory
39  * since the EC is supposed to continue running even if the AP resets.
42  * to enter recovery mode. The EC passes this to U-Boot through the normal
48  * 6. Hashing of the EC image, again to support software sync.
51  * the EC image in with U-Boot (Vic has demonstrated a prototype for this).
67  * struct ec_state - Information about the EC state
69  * @vbnv_context: Vboot context data stored by EC
70  * @ec_config: FDT config information about the EC (e.g. flashmap)
73  * @current_image: Current image the EC is running
92  * cros_ec_read_state() - read the sandbox EC state from the state file
95  * not this function sets up an empty EC.
102 	struct ec_state *ec = &s_state;  in cros_ec_read_state()  local
107 	ec->current_image = EC_IMAGE_RO;  in cros_ec_read_state()
112 	ec->current_image = fdtdec_get_int(blob, node, "current-image",  in cros_ec_read_state()
115 	if (prop && len == sizeof(ec->vbnv_context))  in cros_ec_read_state()
116 		memcpy(ec->vbnv_context, prop, len);  in cros_ec_read_state()
120 		ec->flash_data_len = len;  in cros_ec_read_state()
121 		ec->flash_data = os_malloc(len);  in cros_ec_read_state()
122 		if (!ec->flash_data)  in cros_ec_read_state()
124 		memcpy(ec->flash_data, prop, len);  in cros_ec_read_state()
125 		debug("%s: Loaded EC flash data size %#x\n", __func__, len);  in cros_ec_read_state()
142 	struct ec_state *ec = g_state;  in cros_ec_write_state()  local
145 	fdt_setprop_u32(blob, node, "current-image", ec->current_image);  in cros_ec_write_state()
146 	fdt_setprop(blob, node, "vbnv-context", ec->vbnv_context,  in cros_ec_write_state()
147 		    sizeof(ec->vbnv_context));  in cros_ec_write_state()
148 	return state_setprop(node, "flash-data", ec->flash_data,  in cros_ec_write_state()
149 			     ec->ec_config.flash.length);  in cros_ec_write_state()
152 SANDBOX_STATE_IO(cros_ec, "google,cros-ec", cros_ec_read_state,
160  * that used by the real EC code base.
162  * @param ec	Current emulated EC state
167 static int get_image_used(struct ec_state *ec, struct fmap_entry *entry)  in get_image_used()  argument
173 	 * last byte of the image.  See ec.lds.S for how this is inserted at  in get_image_used()
177 	     size > 0 && ec->flash_data[entry->offset + size] != 0xea;  in get_image_used()
190  * @param ec	Current emulated EC state
194 static int keyscan_read_fdt_matrix(struct ec_state *ec, ofnode node)  in keyscan_read_fdt_matrix()  argument
201 	ec->matrix_count = len / 4;  in keyscan_read_fdt_matrix()
202 	ec->matrix = calloc(ec->matrix_count, sizeof(*ec->matrix));  in keyscan_read_fdt_matrix()
203 	if (!ec->matrix) {  in keyscan_read_fdt_matrix()
209 	for (upto = 0; upto < ec->matrix_count; upto++) {  in keyscan_read_fdt_matrix()
210 		struct ec_keymatrix_entry *matrix = &ec->matrix[upto];  in keyscan_read_fdt_matrix()
227 	if (upto != ec->matrix_count) {  in keyscan_read_fdt_matrix()
238  * @param ec	Current emulated EC state
243 static int cros_ec_keyscan(struct ec_state *ec, uint8_t *scan)  in cros_ec_keyscan()  argument
251 	memset(ec->keyscan, '\0', bytes);  in cros_ec_keyscan()
255 	for (i = 0, matrix = ec->matrix; i < ec->matrix_count; i++, matrix++) {  in cros_ec_keyscan()
267 			ec->keyscan[matrix->col] |= 1 << matrix->row;  in cros_ec_keyscan()
271 	memcpy(scan, ec->keyscan, bytes);  in cros_ec_keyscan()
276  * Process an emulated EC command
278  * @param ec		Current emulated EC state
285 static int process_cmd(struct ec_state *ec,  in process_cmd()  argument
292 	debug("EC command %#0x\n", req_hdr->command);  in process_cmd()
308 		resp->current_image = ec->current_image;  in process_cmd()
319 			memcpy(resp->block, ec->vbnv_context,  in process_cmd()
324 			memcpy(ec->vbnv_context, resp->block,  in process_cmd()
344 			ec->current_image = EC_IMAGE_RW;  in process_cmd()
357 		if (ec->recovery_req) {  in process_cmd()
371 		entry = &ec->ec_config.region[EC_FLASH_REGION_RW];  in process_cmd()
377 			len = get_image_used(ec, entry);  in process_cmd()
379 					 ec->flash_data + entry->offset,  in process_cmd()
428 			entry = &ec->ec_config.region[req->region];  in process_cmd()
432 			printf("EC flash region %d: offset=%#x, size=%#x\n",  in process_cmd()
444 		memset(ec->flash_data + req->offset,  in process_cmd()
445 		       ec->ec_config.flash_erase_value,  in process_cmd()
453 		memcpy(ec->flash_data + req->offset, req + 1, req->size);  in process_cmd()
458 		len = cros_ec_keyscan(ec, resp_data);  in process_cmd()
464 		printf("   ** Unknown EC command %#02x\n", req_hdr->command);  in process_cmd()
474 	struct ec_state *ec = dev_get_priv(dev->dev);  in cros_ec_sandbox_packet()  local
481 	len = process_cmd(ec, req_hdr, req_data, resp_hdr, resp_data);  in cros_ec_sandbox_packet()
499 	struct ec_state *ec = dev_get_priv(dev->dev);  in cros_ec_check_keyboard()  local
502 	printf("Press keys for EC to detect on reset (ESC=recovery)...");  in cros_ec_check_keyboard()
508 		ec->recovery_req = true;  in cros_ec_check_keyboard()
509 		printf("   - EC requests recovery\n");  in cros_ec_check_keyboard()
515 	struct ec_state *ec = dev->priv;  in cros_ec_probe()  local
521 	memcpy(ec, &s_state, sizeof(*ec));  in cros_ec_probe()
522 	err = cros_ec_decode_ec_flash(dev, &ec->ec_config);  in cros_ec_probe()
524 		debug("%s: Cannot device EC flash\n", __func__);  in cros_ec_probe()
539 	} else if (keyscan_read_fdt_matrix(ec, node)) {  in cros_ec_probe()
544 	/* If we loaded EC data, check that the length matches */  in cros_ec_probe()
545 	if (ec->flash_data &&  in cros_ec_probe()
546 	    ec->flash_data_len != ec->ec_config.flash.length) {  in cros_ec_probe()
547 		printf("EC data length is %x, expected %x, discarding data\n",  in cros_ec_probe()
548 		       ec->flash_data_len, ec->ec_config.flash.length);  in cros_ec_probe()
549 		os_free(ec->flash_data);  in cros_ec_probe()
550 		ec->flash_data = NULL;  in cros_ec_probe()
554 	if (!ec->flash_data) {  in cros_ec_probe()
555 		ec->flash_data_len = ec->ec_config.flash.length;  in cros_ec_probe()
556 		ec->flash_data = os_malloc(ec->flash_data_len);  in cros_ec_probe()
557 		if (!ec->flash_data)  in cros_ec_probe()
562 	g_state = ec;  in cros_ec_probe()
571 	{ .compatible = "google,cros-ec-sandbox" },