3  * This file provides ECC correction for more than 1 bit per block of data,
15 #include <linux/mtd/nand-ecc-sw-bch.h>
18  * nand_ecc_sw_bch_calculate - Calculate the ECC corresponding to a data block
21  * @code: Output buffer with ECC
26 	struct nand_ecc_sw_bch_conf *engine_conf = nand->ecc.ctx.priv;  in nand_ecc_sw_bch_calculate()
30 	bch_encode(engine_conf->bch, buf, nand->ecc.ctx.conf.step_size, code);  in nand_ecc_sw_bch_calculate()
44  * @read_ecc: ECC bytes from the chip
45  * @calc_ecc: ECC calculated from the raw data
52 	struct nand_ecc_sw_bch_conf *engine_conf = nand->ecc.ctx.priv;  in nand_ecc_sw_bch_correct()
53 	unsigned int step_size = nand->ecc.ctx.conf.step_size;  in nand_ecc_sw_bch_correct()
65 			/* Otherwise the error is in the ECC area: nothing to do */  in nand_ecc_sw_bch_correct()
70 		pr_err("ECC unrecoverable error\n");  in nand_ecc_sw_bch_correct()
79  * nand_ecc_sw_bch_cleanup - Cleanup software BCH ECC resources
84 	struct nand_ecc_sw_bch_conf *engine_conf = nand->ecc.ctx.priv;  in nand_ecc_sw_bch_cleanup()
92  * nand_ecc_sw_bch_init - Initialize software BCH ECC engine
97  * Initialize NAND BCH error correction. @nand.ecc parameters 'step_size' and
110 	struct nand_ecc_sw_bch_conf *engine_conf = nand->ecc.ctx.priv;  in nand_ecc_sw_bch_init()
111 	unsigned int eccsize = nand->ecc.ctx.conf.step_size;  in nand_ecc_sw_bch_init()
132 	/* Compute and store the inverted ECC of an erased step */  in nand_ecc_sw_bch_init()
149 		pr_err("Invalid number of ECC bytes: %u, expected: %u\n",  in nand_ecc_sw_bch_init()
157 		pr_err("ECC step size is too large (%u)\n", eccsize);  in nand_ecc_sw_bch_init()
172 	struct nand_ecc_props *conf = &nand->ecc.ctx.conf;  in nand_ecc_sw_bch_init_ctx()
189 	conf->step_size = nand->ecc.user_conf.step_size;  in nand_ecc_sw_bch_init_ctx()
190 	conf->strength = nand->ecc.user_conf.strength;  in nand_ecc_sw_bch_init_ctx()
193 	 * Board driver should supply ECC size and ECC strength  in nand_ecc_sw_bch_init_ctx()
210 	if (nand->ecc.user_conf.flags & NAND_ECC_MAXIMIZE_STRENGTH) {  in nand_ecc_sw_bch_init_ctx()
226 		pr_err("Missing ECC parameters\n");  in nand_ecc_sw_bch_init_ctx()
246 	nand->ecc.ctx.priv = engine_conf;  in nand_ecc_sw_bch_init_ctx()
247 	nand->ecc.ctx.nsteps = nsteps;  in nand_ecc_sw_bch_init_ctx()
248 	nand->ecc.ctx.total = nsteps * code_size;  in nand_ecc_sw_bch_init_ctx()
256 	    nand->ecc.ctx.nsteps * engine_conf->code_size) {  in nand_ecc_sw_bch_init_ctx()
257 		pr_err("Invalid ECC layout\n");  in nand_ecc_sw_bch_init_ctx()
279 	struct nand_ecc_sw_bch_conf *engine_conf = nand->ecc.ctx.priv;  in nand_ecc_sw_bch_cleanup_ctx()
294 	struct nand_ecc_sw_bch_conf *engine_conf = nand->ecc.ctx.priv;  in nand_ecc_sw_bch_prepare_io_req()
296 	int eccsize = nand->ecc.ctx.conf.step_size;  in nand_ecc_sw_bch_prepare_io_req()
298 	int eccsteps = nand->ecc.ctx.nsteps;  in nand_ecc_sw_bch_prepare_io_req()
299 	int total = nand->ecc.ctx.total;  in nand_ecc_sw_bch_prepare_io_req()
318 	/* Preparation for page write: derive the ECC bytes and place them */  in nand_ecc_sw_bch_prepare_io_req()
331 	struct nand_ecc_sw_bch_conf *engine_conf = nand->ecc.ctx.priv;  in nand_ecc_sw_bch_finish_io_req()
333 	int eccsize = nand->ecc.ctx.conf.step_size;  in nand_ecc_sw_bch_finish_io_req()
334 	int total = nand->ecc.ctx.total;  in nand_ecc_sw_bch_finish_io_req()
336 	int eccsteps = nand->ecc.ctx.nsteps;  in nand_ecc_sw_bch_finish_io_req()
357 	/* Finish a page read: retrieve the (raw) ECC bytes*/  in nand_ecc_sw_bch_finish_io_req()
363 	/* Calculate the ECC bytes */  in nand_ecc_sw_bch_finish_io_req()
368 	for (eccsteps = nand->ecc.ctx.nsteps, i = 0, data = req->databuf.in;  in nand_ecc_sw_bch_finish_io_req()
406 MODULE_DESCRIPTION("NAND software BCH ECC support");