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Fri, 25 Oct 2019 13:26:43 -0700 (PDT) From: Sergei Shtylyov Subject: [PATCH] mtd: spi-nor: use spi-mem dirmap API To: Marek Vasut , David Woodhouse , Brian Norris , Richard Weinberger , linux-mtd@lists.infradead.org, Miquel Raynal , Vignesh Raghavendra References: <610761cf-5a19-c182-07d8-8d118ca20035@cogentembedded.com> Organization: Cogent Embedded Message-ID: <97330369-c42e-0ce3-ab1e-0f4433e6acad@cogentembedded.com> Date: Fri, 25 Oct 2019 23:26:42 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: <610761cf-5a19-c182-07d8-8d118ca20035@cogentembedded.com> Content-Language: en-MW X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191025_132646_973938_49ED931F X-CRM114-Status: GOOD ( 18.18 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Boris Brezillon Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org Make use of the spi-mem direct mapping API to let advanced controllers optimize read/write operations when they support direct mapping. Based on the original patch by Boris Brezillon . Signed-off-by: Sergei Shtylyov --- This patch is against the 'spi-nor/next' branch of the MTD 'linux.git' repo. drivers/mtd/spi-nor/spi-nor.c | 79 ++++++++++++++++++++++++++++++++++++++++++ include/linux/mtd/spi-nor.h | 5 ++ 2 files changed, 84 insertions(+) Index: linux/drivers/mtd/spi-nor/spi-nor.c =================================================================== --- linux.orig/drivers/mtd/spi-nor/spi-nor.c +++ linux/drivers/mtd/spi-nor/spi-nor.c @@ -2562,6 +2562,14 @@ static int spi_nor_read(struct mtd_info if (ret) return ret; + if (nor->dirmap.rdesc) { + ret = spi_mem_dirmap_read(nor->dirmap.rdesc, from, len, buf); + if (ret < 0) + goto read_err; + *retlen += ret; + goto done; + } + while (len) { loff_t addr = from; @@ -2582,6 +2590,7 @@ static int spi_nor_read(struct mtd_info from += ret; len -= ret; } +done: ret = 0; read_err: @@ -2686,6 +2695,14 @@ static int spi_nor_write(struct mtd_info if (ret) return ret; + if (nor->dirmap.wdesc) { + ret = spi_mem_dirmap_write(nor->dirmap.wdesc, to, len, buf); + if (ret < 0) + goto write_err; + *retlen += ret; + goto done; + } + for (i = 0; i < len; ) { ssize_t written; loff_t addr = to + i; @@ -2723,6 +2740,8 @@ static int spi_nor_write(struct mtd_info *retlen += written; i += written; } +done: + ret = 0; write_err: spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_WRITE); @@ -4991,6 +5010,58 @@ int spi_nor_scan(struct spi_nor *nor, co } EXPORT_SYMBOL_GPL(spi_nor_scan); +static int spi_nor_create_read_dirmap(struct spi_nor *nor) +{ + struct spi_mem_dirmap_info info = { + .op_tmpl = SPI_MEM_OP(SPI_MEM_OP_CMD(nor->read_opcode, 1), + SPI_MEM_OP_ADDR(nor->addr_width, 0, 1), + SPI_MEM_OP_DUMMY(nor->read_dummy, 1), + SPI_MEM_OP_DATA_IN(0, NULL, 1)), + .offset = 0, + .length = nor->mtd.size, + }; + struct spi_mem_op *op = &info.op_tmpl; + + /* get transfer protocols. */ + op->cmd.buswidth = spi_nor_get_protocol_inst_nbits(nor->read_proto); + op->addr.buswidth = spi_nor_get_protocol_addr_nbits(nor->read_proto); + op->dummy.buswidth = op->addr.buswidth; + op->data.buswidth = spi_nor_get_protocol_data_nbits(nor->read_proto); + + /* convert the dummy cycles to the number of bytes */ + op->dummy.nbytes = (nor->read_dummy * op->dummy.buswidth) / 8; + + nor->dirmap.rdesc = devm_spi_mem_dirmap_create(nor->dev, nor->spimem, + &info); + return PTR_ERR_OR_ZERO(nor->dirmap.rdesc); +} + +static int spi_nor_create_write_dirmap(struct spi_nor *nor) +{ + struct spi_mem_dirmap_info info = { + .op_tmpl = SPI_MEM_OP(SPI_MEM_OP_CMD(nor->program_opcode, 1), + SPI_MEM_OP_ADDR(nor->addr_width, 0, 1), + SPI_MEM_OP_NO_DUMMY, + SPI_MEM_OP_DATA_OUT(0, NULL, 1)), + .offset = 0, + .length = nor->mtd.size, + }; + struct spi_mem_op *op = &info.op_tmpl; + + /* get transfer protocols. */ + op->cmd.buswidth = spi_nor_get_protocol_inst_nbits(nor->write_proto); + op->addr.buswidth = spi_nor_get_protocol_addr_nbits(nor->write_proto); + op->dummy.buswidth = op->addr.buswidth; + op->data.buswidth = spi_nor_get_protocol_data_nbits(nor->write_proto); + + if (nor->program_opcode == SPINOR_OP_AAI_WP && nor->sst_write_second) + op->addr.nbytes = 0; + + nor->dirmap.wdesc = devm_spi_mem_dirmap_create(nor->dev, nor->spimem, + &info); + return PTR_ERR_OR_ZERO(nor->dirmap.wdesc); +} + static int spi_nor_probe(struct spi_mem *spimem) { struct spi_device *spi = spimem->spi; @@ -5052,6 +5123,14 @@ static int spi_nor_probe(struct spi_mem return -ENOMEM; } + ret = spi_nor_create_read_dirmap(nor); + if (ret) + return ret; + + ret = spi_nor_create_write_dirmap(nor); + if (ret) + return ret; + return mtd_device_register(&nor->mtd, data ? data->parts : NULL, data ? data->nr_parts : 0); } Index: linux/include/linux/mtd/spi-nor.h =================================================================== --- linux.orig/include/linux/mtd/spi-nor.h +++ linux/include/linux/mtd/spi-nor.h @@ -611,6 +611,11 @@ struct spi_nor { int (*clear_sr_bp)(struct spi_nor *nor); struct spi_nor_flash_parameter params; + struct { + struct spi_mem_dirmap_desc *rdesc; + struct spi_mem_dirmap_desc *wdesc; + } dirmap; + void *priv; }; ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/