16  * - BCH6  : Generate 10 ECC bytes from 512 data bytes plus 6 free bytes
17  * - BCH12 : Generate 20 ECC bytes from 512 data bytes plus 6 free bytes
29  * - tag      : 6 User/free bytes. First tag "contains" 2 bytes BBI. Protected by ECC!
37  * | data | data | data | data | BBI | free | free | free | free | ECC | ECC | ECC | ECC |
51  * The engine is fed with two DMA regions. One for data (always 512 bytes) and one for free bytes
146 	.free = rtl_ecc_ooblayout_free,
169 	 * and 6 free bytes. In case the NAND area has been erased and all data and oob is  in rtl_ecc_wait_for_engine()
191 static int rtl_ecc_run_engine(struct rtl_ecc_ctx *ctx, char *data, char *free,  in rtl_ecc_run_engine()  argument
203 	memcpy(buf_free, free, RTL_ECC_FREE_SIZE);  in rtl_ecc_run_engine()
213 		memcpy(free, buf_free, RTL_ECC_FREE_SIZE);  in rtl_ecc_run_engine()
226 	char *data, *free, *parity;  in rtl_ecc_prepare_io_req()  local
237 	free = req->oobbuf.in;  in rtl_ecc_prepare_io_req()
242 		ret |= rtl_ecc_run_engine(ctx, data, free, parity, RTL_ECC_OP_ENCODE);  in rtl_ecc_prepare_io_req()
244 		free += RTL_ECC_FREE_SIZE;  in rtl_ecc_prepare_io_req()
260 	char *data, *free, *parity;  in rtl_ecc_finish_io_req()  local
272 	free = req->oobbuf.in;  in rtl_ecc_finish_io_req()
277 		int ret = rtl_ecc_run_engine(ctx, data, free, parity, RTL_ECC_OP_DECODE);  in rtl_ecc_finish_io_req()
283 							  free, RTL_ECC_FREE_SIZE,  in rtl_ecc_finish_io_req()
293 		free += RTL_ECC_FREE_SIZE;  in rtl_ecc_finish_io_req()
368 	dev_dbg(dev, "using bch%d with geometry data=%dx%d, free=%dx6, parity=%dx%d",  in rtl_ecc_init_ctx()