/*
* Read the platform configuration file from the EPROM.
*
* On success, an allocated buffer containing the data and its size are
* returned. It is up to the caller to free this buffer.
*
* Return value:
* 0 - success
* -ENXIO - no EPROM is available
* -EBUSY - not able to acquire access to the EPROM
* -ENOENT - no recognizable file written
* -ENOMEM - buffer could not be allocated
*/
int eprom_read_platform_config(struct hfi1_devdata *dd, void **data, u32 *size)
{
u32 directory[EP_PAGE_DWORDS]; /* aligned buffer */
int ret;
if (!dd->eprom_available)
return -ENXIO;
ret = acquire_chip_resource(dd, CR_EPROM, EPROM_TIMEOUT);
if (ret)
return -EBUSY;
/* read the last page of P0 for the EPROM format magic */
ret = read_length(dd, P1_START - EP_PAGE_SIZE, EP_PAGE_SIZE, directory);
if (ret)
goto done;
/* last dword of P0 contains a magic indicator */
if (directory[EP_PAGE_DWORDS - 1] == 0) {
/* partition format */
ret = read_partition_platform_config(dd, data, size);
goto done;
}
/* nothing recognized */
ret = -ENOENT;
done:
release_chip_resource(dd, CR_EPROM);
return ret;
}
/*
* Read the platform configuration file from the EPROM.
*
* On success, an allocated buffer containing the data and its size are
* returned. It is up to the caller to free this buffer.
*
* Return value:
* 0 - success
* -ENXIO - no EPROM is available
* -EBUSY - not able to acquire access to the EPROM
* -ENOENT - no recognizable file written
* -ENOMEM - buffer could not be allocated
* -EINVAL - invalid EPROM contentents found
*/
int eprom_read_platform_config(struct hfi1_devdata *dd, void **data, u32 *size)
{
u32 directory[EP_PAGE_DWORDS]; /* aligned buffer */
int ret;
if (!dd->eprom_available)
return -ENXIO;
ret = acquire_chip_resource(dd, CR_EPROM, EPROM_TIMEOUT);
if (ret)
return -EBUSY;
/* read the last page of the segment for the EPROM format magic */
ret = read_length(dd, SEG_SIZE - EP_PAGE_SIZE, EP_PAGE_SIZE, directory);
if (ret)
goto done;
/* last dword of the segment contains a magic value */
if (directory[EP_PAGE_DWORDS - 1] == FOOTER_MAGIC) {
/* segment format */
ret = read_segment_platform_config(dd, directory, data, size);
} else {
/* partition format */
ret = read_partition_platform_config(dd, data, size);
}
done:
release_chip_resource(dd, CR_EPROM);
return ret;
}