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mtd: rawnand: Add destructive operation

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Erase and program operations need the write protect (wp) pin to be
de-asserted to take effect. Add the concept of destructive
operation and pass the information to exec_op() so controllers know
when they should de-assert this pin without having to decode
the command opcode.

Signed-off-by: Boris Brezillon <bbrezillon@kernel.org>
Signed-off-by: David Regan <dregan@broadcom.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20231125012438.15191-1-dregan@broadcom.com
This commit is contained in:
Boris Brezillon 2023-11-24 17:24:35 -08:00 committed by Miquel Raynal
parent 2082b6956c
commit 578dc962ff
2 changed files with 15 additions and 2 deletions
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6
drivers/mtd/nand/raw/nand_base.c
View File

@ -1493,7 +1493,8 @@ static int nand_exec_prog_page_op(struct nand_chip *chip, unsigned int page,
NAND_COMMON_TIMING_NS(conf, tWB_max)),
NAND_OP_WAIT_RDY(NAND_COMMON_TIMING_MS(conf, tPROG_max), 0),
};
struct nand_operation op = NAND_OPERATION(chip->cur_cs, instrs);
struct nand_operation op = NAND_DESTRUCTIVE_OPERATION(chip->cur_cs,
instrs);
int naddrs = nand_fill_column_cycles(chip, addrs, offset_in_page);
if (naddrs < 0)
@ -1916,7 +1917,8 @@ int nand_erase_op(struct nand_chip *chip, unsigned int eraseblock)
NAND_OP_WAIT_RDY(NAND_COMMON_TIMING_MS(conf, tBERS_max),
0),
};
struct nand_operation op = NAND_OPERATION(chip->cur_cs, instrs);
struct nand_operation op = NAND_DESTRUCTIVE_OPERATION(chip->cur_cs,
instrs);
if (chip->options & NAND_ROW_ADDR_3)
instrs[1].ctx.addr.naddrs++;

11
include/linux/mtd/rawnand.h
View File

@ -1003,6 +1003,8 @@ struct nand_op_parser {
/**
* struct nand_operation - NAND operation descriptor
* @cs: the CS line to select for this NAND operation
* @deassert_wp: set to true when the operation requires the WP pin to be
* de-asserted (ERASE, PROG, ...)
* @instrs: array of instructions to execute
* @ninstrs: length of the @instrs array
*
@ -1010,6 +1012,7 @@ struct nand_op_parser {
*/
struct nand_operation {
unsigned int cs;
bool deassert_wp;
const struct nand_op_instr *instrs;
unsigned int ninstrs;
};
@ -1021,6 +1024,14 @@ struct nand_operation {
.ninstrs = ARRAY_SIZE(_instrs), \
}
#define NAND_DESTRUCTIVE_OPERATION(_cs, _instrs) \
{ \
.cs = _cs, \
.deassert_wp = true, \
.instrs = _instrs, \
.ninstrs = ARRAY_SIZE(_instrs), \
}
int nand_op_parser_exec_op(struct nand_chip *chip,
const struct nand_op_parser *parser,
const struct nand_operation *op, bool check_only);