From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
To: Marek Vasut <marek.vasut@gmail.com>,
David Woodhouse <dwmw2@infradead.org>,
Brian Norris <computersforpeace@gmail.com>,
Richard Weinberger <richard@nod.at>,
linux-mtd@lists.infradead.org,
Miquel Raynal <miquel.raynal@bootlin.com>,
Vignesh Raghavendra <vigneshr@ti.com>
Cc: Boris Brezillon <bbrezillon@kernel.org>
Subject: [PATCH] mtd: spi-nor: use spi-mem dirmap API
Date: Fri, 25 Oct 2019 23:26:42 +0300 [thread overview]
Message-ID: <97330369-c42e-0ce3-ab1e-0f4433e6acad@cogentembedded.com> (raw)
In-Reply-To: <610761cf-5a19-c182-07d8-8d118ca20035@cogentembedded.com>
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 <boris.brezillon@bootlin.com>.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
---
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;
};
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next prev parent reply other threads:[~2019-10-25 20:26 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-16 17:49 [PATCH 0/2] Untangle Spansion S25F{L|S}512S chip IDs Sergei Shtylyov
2019-01-16 17:51 ` [PATCH 1/2] mtd: spi-nor: add Spansion S25FS512S ID Sergei Shtylyov
2019-01-22 10:18 ` Tudor.Ambarus
2019-01-24 11:55 ` [1/2] " Boris Brezillon
2019-01-16 17:53 ` [PATCH 2/2] mtd: spi-nor: refine Spansion S25FL512S ID Sergei Shtylyov
2019-01-22 10:18 ` Tudor.Ambarus
2019-01-24 11:55 ` [2/2] " Boris Brezillon
2019-03-05 14:05 ` [PATCH 2/2] " Geert Uytterhoeven
2019-03-06 10:59 ` Tudor.Ambarus
2019-03-06 11:28 ` Tudor.Ambarus
2019-03-12 11:02 ` Geert Uytterhoeven
2019-01-21 8:28 ` [PATCH 0/2] Untangle Spansion S25F{L|S}512S chip IDs Tudor.Ambarus
2019-01-21 17:40 ` Sergei Shtylyov
2019-05-31 18:31 ` [PATCH v4] mtd: devices: m25p80: Use the spi-mem dirmap API Sergei Shtylyov
2019-06-18 4:30 ` Vignesh Raghavendra
2019-07-03 20:26 ` [PATCH] mtd: chips: gen_probe: kill useless initializer in mtd_do_chip_probe() Sergei Shtylyov
2019-09-17 4:24 ` Vignesh Raghavendra
2019-09-17 19:28 ` [PATCH] mtd: cfi_util: use DIV_ROUND_UP() in cfi_udelay() Sergei Shtylyov
2019-09-17 19:43 ` Geert Uytterhoeven
2019-09-17 19:53 ` Sergei Shtylyov
2019-09-17 21:23 ` Geert Uytterhoeven
2019-09-18 5:45 ` Vignesh Raghavendra
2019-09-27 20:15 ` Sergei Shtylyov
2019-10-25 20:26 ` Sergei Shtylyov [this message]
2019-10-26 7:36 ` [PATCH] mtd: spi-nor: use spi-mem dirmap API Boris Brezillon
2019-11-07 18:51 ` Sergei Shtylyov
2019-11-07 20:49 ` [PATCH v2] " Sergei Shtylyov
2019-11-07 20:56 ` Sergei Shtylyov
2019-11-07 20:56 ` Sergei Shtylyov
2019-11-09 19:35 ` Boris Brezillon
2019-11-10 19:49 ` Sergei Shtylyov
2020-02-01 20:55 ` [PATCH] mtd: spi-nor: use le32_to_cpu_array() Sergei Shtylyov
2020-02-17 0:03 ` Tudor.Ambarus
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