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ramips: improve read performance of the m25p80 chunked io patch

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Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 47137
This commit is contained in:
Felix Fietkau 2015-10-05 11:34:16 +00:00
parent 8181976067
commit 38389c79c2
1 changed files with 58 additions and 7 deletions
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65
target/linux/ramips/patches-3.18/0044-mtd-add-chunked-read-io-to-m25p80.patch
View file

@ -16,10 +16,56 @@
u8 command[MAX_CMD_SIZE]; u8 command[MAX_CMD_SIZE];
}; };
@@ -157,6 +159,61 @@ static int m25p80_read(struct spi_nor *n @@ -117,25 +119,14 @@ static inline unsigned int m25p80_rx_nbi
return 0; }
} }
-/*
- * Read an address range from the nor chip. The address range
- * may be any size provided it is within the physical boundaries.
- */
-static int m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
- size_t *retlen, u_char *buf)
+static int __m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
+ size_t *retlen, u_char *buf)
{
struct m25p *flash = nor->priv;
struct spi_device *spi = flash->spi;
struct spi_transfer t[2];
struct spi_message m;
int dummy = nor->read_dummy;
- int ret;
-
- /* Wait till previous write/erase is done. */
- ret = nor->wait_till_ready(nor);
- if (ret)
- return ret;
-
spi_message_init(&m);
memset(t, 0, (sizeof t));
@@ -156,6 +147,84 @@ static int m25p80_read(struct spi_nor *n
*retlen = m.actual_length - m25p_cmdsz(nor) - dummy;
return 0;
}
+/*
+ * Read an address range from the nor chip. The address range
+ * may be any size provided it is within the physical boundaries.
+ */
+static int m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
+ size_t *retlen, u_char *buf)
+{
+ int ret;
+
+ /* Wait till previous write/erase is done. */
+ ret = nor->wait_till_ready(nor);
+ if (ret)
+ return ret;
+
+ return __m25p80_read(nor, from, len, retlen, buf);
+}
+
+
+static void m25p80_chunked_write(struct spi_nor *nor, loff_t _from, size_t _len, +static void m25p80_chunked_write(struct spi_nor *nor, loff_t _from, size_t _len,
+ size_t *_retlen, const u_char *_buf) + size_t *_retlen, const u_char *_buf)
+{ +{
@ -52,6 +98,12 @@
+{ +{
+ struct m25p *flash = nor->priv; + struct m25p *flash = nor->priv;
+ int chunk_size; + int chunk_size;
+ int ret;
+
+ /* Wait till previous write/erase is done. */
+ ret = nor->wait_till_ready(nor);
+ if (ret)
+ return ret;
+ +
+ chunk_size = flash->chunk_size; + chunk_size = flash->chunk_size;
+ if (!chunk_size) + if (!chunk_size)
@ -64,7 +116,7 @@
+ u_char *buf = _buf + *_retlen; + u_char *buf = _buf + *_retlen;
+ loff_t from = _from + *_retlen; + loff_t from = _from + *_retlen;
+ int retlen = 0; + int retlen = 0;
+ int ret = m25p80_read(nor, from, len, &retlen, buf); + int ret = __m25p80_read(nor, from, len, &retlen, buf);
+ +
+ if (ret) + if (ret)
+ return ret; + return ret;
@ -74,11 +126,10 @@
+ +
+ return 0; + return 0;
+} +}
+
static int m25p80_erase(struct spi_nor *nor, loff_t offset) static int m25p80_erase(struct spi_nor *nor, loff_t offset)
{ {
struct m25p *flash = nor->priv; @@ -197,6 +266,7 @@ static int m25p_probe(struct spi_device
@@ -197,6 +254,7 @@ static int m25p_probe(struct spi_device
struct spi_nor *nor; struct spi_nor *nor;
enum read_mode mode = SPI_NOR_NORMAL; enum read_mode mode = SPI_NOR_NORMAL;
char *flash_name = NULL; char *flash_name = NULL;
@ -86,7 +137,7 @@
int ret; int ret;
data = dev_get_platdata(&spi->dev); data = dev_get_platdata(&spi->dev);
@@ -244,6 +302,14 @@ static int m25p_probe(struct spi_device @@ -244,6 +314,14 @@ static int m25p_probe(struct spi_device
if (ret) if (ret)
return ret; return ret;