1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
12  * The EPROM is logically divided into three partitions:
24 #define EP_PAGE_MASK (EP_PAGE_SIZE - 1)
45  * All callers have verified the offset is at a page boundary.
47 static void read_page(struct hfi1_devdata *dd, u32 offset, u32 *result)  in read_page()  argument
51 	write_csr(dd, ASIC_EEP_ADDR_CMD, CMD_READ_DATA(offset));  in read_page()
58  * Read length bytes starting at offset from the start of the EPROM.
75 	 * command address range.  Note that '>' is correct below - the end  in read_length()
79 		return -EINVAL;  in read_length()
91 		bytes = EP_PAGE_SIZE - start_offset;  in read_length()
102 		len -= bytes;  in read_length()
113 		len -= EP_PAGE_SIZE;  in read_length()
134 	if (dd->pcidev->device != PCI_DEVICE_ID_INTEL0)  in eprom_init()
160 	dd->eprom_available = true;  in eprom_init()
175 /* segment size - 128 KiB */
187 	u32 offset;		/* file offset from start of EPROM */  member
192  * Calculate the max number of table entries that will fit within a directory
196 	(((dir_size) - sizeof(struct hfi1_eprom_footer)) / \
220 		return -ENOMEM;  in read_partition_platform_config()
231 		return -ENOENT;  in read_partition_platform_config()
237 		length = p - buffer;  in read_partition_platform_config()
247  * The segment magic has been checked.  There is a footer and table of
256 	struct hfi1_eprom_table_entry *table;  in read_segment_platform_config()  local
267 			(directory + EP_PAGE_SIZE - sizeof(*footer));  in read_segment_platform_config()
270 	if (footer->version != FOOTER_VERSION)  in read_segment_platform_config()
271 		return -EINVAL;  in read_segment_platform_config()
274 	if (footer->oprom_size >= SEG_SIZE)  in read_segment_platform_config()
275 		return -EINVAL;  in read_segment_platform_config()
277 	/* the file table must fit in a segment with the oprom */  in read_segment_platform_config()
278 	if (footer->num_table_entries >  in read_segment_platform_config()
279 			MAX_TABLE_ENTRIES(SEG_SIZE - footer->oprom_size))  in read_segment_platform_config()
280 		return -EINVAL;  in read_segment_platform_config()
282 	/* find the file table start, which precedes the footer */  in read_segment_platform_config()
283 	directory_size = DIRECTORY_SIZE(footer->num_table_entries);  in read_segment_platform_config()
285 		/* the file table fits into the directory buffer handed in */  in read_segment_platform_config()
286 		table = (struct hfi1_eprom_table_entry *)  in read_segment_platform_config()
287 				(directory + EP_PAGE_SIZE - directory_size);  in read_segment_platform_config()
292 			return -ENOMEM;  in read_segment_platform_config()
293 		ret = read_length(dd, SEG_SIZE - directory_size,  in read_segment_platform_config()
297 		table = table_buffer;  in read_segment_platform_config()
300 	/* look for the platform configuration file in the table */  in read_segment_platform_config()
301 	for (entry = NULL, i = 0; i < footer->num_table_entries; i++) {  in read_segment_platform_config()
302 		if (table[i].type == HFI1_EFT_PLATFORM_CONFIG) {  in read_segment_platform_config()
303 			entry = &table[i];  in read_segment_platform_config()
308 		ret = -ENOENT;  in read_segment_platform_config()
313 	 * Sanity check on the configuration file size - it should never  in read_segment_platform_config()
316 	if (entry->size > (4 * 1024)) {  in read_segment_platform_config()
318 			   entry->size);  in read_segment_platform_config()
319 		ret = -EINVAL;  in read_segment_platform_config()
323 	/* check for bogus offset and size that wrap when added together */  in read_segment_platform_config()
324 	if (entry->offset + entry->size < entry->offset) {  in read_segment_platform_config()
327 			   entry->offset, entry->size);  in read_segment_platform_config()
328 		ret = -EINVAL;  in read_segment_platform_config()
333 	buffer = kmalloc(entry->size, GFP_KERNEL);  in read_segment_platform_config()
335 		ret = -ENOMEM;  in read_segment_platform_config()
342 	seg_offset = entry->offset % SEG_SIZE;  in read_segment_platform_config()
343 	seg_base = entry->offset - seg_offset;  in read_segment_platform_config()
345 	while (ncopied < entry->size) {  in read_segment_platform_config()
348 		/* start with the bytes from the current offset to the end */  in read_segment_platform_config()
349 		bytes_available = SEG_SIZE - seg_offset;  in read_segment_platform_config()
350 		/* subtract off footer and table from segment 0 */  in read_segment_platform_config()
358 					   "Bad configuration file - offset 0x%x within footer+table\n",  in read_segment_platform_config()
359 					   entry->offset);  in read_segment_platform_config()
360 				ret = -EINVAL;  in read_segment_platform_config()
363 			bytes_available -= directory_size;  in read_segment_platform_config()
367 		to_copy = entry->size - ncopied;  in read_segment_platform_config()
376 		 * The sanity check for entry->offset is done in read_length().  in read_segment_platform_config()
377 		 * The EPROM offset is validated against what the hardware  in read_segment_platform_config()
378 		 * addressing supports.  In addition, if the offset is larger  in read_segment_platform_config()
391 		seg_offset = footer->oprom_size;  in read_segment_platform_config()
398 	*size = entry->size;  in read_segment_platform_config()
414  *   0	      - success
415  *   -ENXIO   - no EPROM is available
416  *   -EBUSY   - not able to acquire access to the EPROM
417  *   -ENOENT  - no recognizable file written
418  *   -ENOMEM  - buffer could not be allocated
419  *   -EINVAL  - invalid EPROM contentents found
426 	if (!dd->eprom_available)  in eprom_read_platform_config()
427 		return -ENXIO;  in eprom_read_platform_config()
431 		return -EBUSY;  in eprom_read_platform_config()
434 	ret = read_length(dd, SEG_SIZE - EP_PAGE_SIZE, EP_PAGE_SIZE, directory);  in eprom_read_platform_config()
439 	if (directory[EP_PAGE_DWORDS - 1] == FOOTER_MAGIC) {  in eprom_read_platform_config()