155 lines
3.7 KiB
Diff
155 lines
3.7 KiB
Diff
--- a/drivers/mtd/devices/m25p80.c
|
|
+++ b/drivers/mtd/devices/m25p80.c
|
|
@@ -19,6 +19,7 @@
|
|
#include <linux/errno.h>
|
|
#include <linux/module.h>
|
|
#include <linux/device.h>
|
|
+#include <linux/of.h>
|
|
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/partitions.h>
|
|
@@ -32,6 +33,7 @@ struct m25p {
|
|
struct spi_device *spi;
|
|
struct spi_nor spi_nor;
|
|
struct mtd_info mtd;
|
|
+ u16 chunk_size;
|
|
u8 command[MAX_CMD_SIZE];
|
|
};
|
|
|
|
@@ -117,25 +119,14 @@ static inline unsigned int m25p80_rx_nbi
|
|
}
|
|
}
|
|
|
|
-/*
|
|
- * 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,
|
|
+ size_t *_retlen, const u_char *_buf)
|
|
+{
|
|
+ struct m25p *flash = nor->priv;
|
|
+ int chunk_size;
|
|
+ int retlen = 0;
|
|
+
|
|
+ chunk_size = flash->chunk_size;
|
|
+ if (!chunk_size)
|
|
+ chunk_size = _len;
|
|
+
|
|
+ if (nor->addr_width > 3)
|
|
+ chunk_size -= nor->addr_width - 3;
|
|
+
|
|
+ while (retlen < _len) {
|
|
+ size_t len = min_t(int, chunk_size, _len - retlen);
|
|
+ const u_char *buf = _buf + retlen;
|
|
+ loff_t from = _from + retlen;
|
|
+
|
|
+ nor->wait_till_ready(nor);
|
|
+ nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0, 0);
|
|
+
|
|
+ m25p80_write(nor, from, len, &retlen, buf);
|
|
+ }
|
|
+ *_retlen += retlen;
|
|
+}
|
|
+
|
|
+static int m25p80_chunked_read(struct spi_nor *nor, loff_t _from, size_t _len,
|
|
+ size_t *_retlen, u_char *_buf)
|
|
+{
|
|
+ struct m25p *flash = nor->priv;
|
|
+ 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;
|
|
+ if (!chunk_size)
|
|
+ chunk_size = _len;
|
|
+
|
|
+ *_retlen = 0;
|
|
+
|
|
+ while (*_retlen < _len) {
|
|
+ size_t len = min_t(int, chunk_size, _len - *_retlen);
|
|
+ u_char *buf = _buf + *_retlen;
|
|
+ loff_t from = _from + *_retlen;
|
|
+ int retlen = 0;
|
|
+ int ret = __m25p80_read(nor, from, len, &retlen, buf);
|
|
+
|
|
+ if (ret)
|
|
+ return ret;
|
|
+
|
|
+ *_retlen += retlen;
|
|
+ }
|
|
+
|
|
+ return 0;
|
|
+}
|
|
|
|
static int m25p80_erase(struct spi_nor *nor, loff_t offset)
|
|
{
|
|
@@ -197,6 +266,7 @@ static int m25p_probe(struct spi_device
|
|
struct spi_nor *nor;
|
|
enum read_mode mode = SPI_NOR_NORMAL;
|
|
char *flash_name = NULL;
|
|
+ u32 val;
|
|
int ret;
|
|
|
|
data = dev_get_platdata(&spi->dev);
|
|
@@ -244,6 +314,14 @@ static int m25p_probe(struct spi_device
|
|
if (ret)
|
|
return ret;
|
|
|
|
+ if (spi->dev.of_node &&
|
|
+ !of_property_read_u32(spi->dev.of_node, "m25p,chunked-io", &val)) {
|
|
+ dev_warn(&spi->dev, "using chunked io\n");
|
|
+ nor->read = m25p80_chunked_read;
|
|
+ nor->write = m25p80_chunked_write;
|
|
+ flash->chunk_size = val;
|
|
+ }
|
|
+
|
|
ppdata.of_node = spi->dev.of_node;
|
|
|
|
return mtd_device_parse_register(&flash->mtd, NULL, &ppdata,
|