espi flash read returns invalid data if the read length is more than 0xFFFA
bytes, it supports maximum transaction of 2^16 bytes at a time, resister
spcom[TRANLEN] is 16 bits. If the transaction length is greater than 0xFFFF,
it need to be split into multiple transactions.
Signed-off-by: Shaohui Xie <b21...@freescale.com>
Cc: Mike Frysinger <vap...@gentoo.org>
---
this patch is rebased on Mike's sf unify patches.
drivers/mtd/spi/spi_flash.c | 30 ++++++++++++++++++++++++++++++
drivers/spi/fsl_espi.c | 6 ++++++
include/spi.h | 2 ++
3 files changed, 38 insertions(+), 0 deletions(-)
diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index f745def..f50ca63 100644
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -127,11 +127,41 @@ int spi_flash_cmd_read_fast(struct spi_flash *flash, u32
offset,
{
u8 cmd[5];
+#ifndef CONFIG_FSL_ESPI
cmd[0] = CMD_READ_ARRAY_FAST;
spi_flash_addr(offset, cmd);
cmd[4] = 0x00;
return spi_flash_read_common(flash, cmd, sizeof(cmd), data, len);
+#else
+ int max_tran_len, num_chunks, tran_len, ret;
+
+ max_tran_len = flash->spi->max_transfer_length;
+ num_chunks = len / max_tran_len + (len % max_tran_len ? 1 : 0);
+
+ while (num_chunks--) {
+ tran_len = min(len , max_tran_len);
+
+ cmd[0] = CMD_READ_ARRAY_FAST;
+ spi_flash_addr(offset, cmd);
+ cmd[4] = 0x00;
+
+ debug("READ: 0x%x => cmd =
+ { 0x%02x 0x%02x%02x%02x%02x } tran_len = 0x%x\n",
+ offset, cmd[0], cmd[1], cmd[2], cmd[3], cmd[4], tran_len);
+
+ ret = spi_flash_read_common(
+ flash, cmd, sizeof(cmd), data, tran_len);
+ if (ret < 0)
+ return ret;
+
+ offset += max_tran_len;
+ data += max_tran_len;
+ len -= max_tran_len;
+ }
+
+ return ret;
+#endif
}
int spi_flash_cmd_poll_bit(struct spi_flash *flash, unsigned long timeout,
diff --git a/drivers/spi/fsl_espi.c b/drivers/spi/fsl_espi.c
index f4ff884..66ae1a8 100644
--- a/drivers/spi/fsl_espi.c
+++ b/drivers/spi/fsl_espi.c
@@ -53,6 +53,8 @@
ESPI_CSMODE_CSBEF(0) | ESPI_CSMODE_CSAFT(0) | \
ESPI_CSMODE_CSCG(1))
+#define ESPI_MAX_DATA_TRANSFER_LEN 0xFFF0
+
struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
@@ -72,6 +74,7 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned
int cs,
slave->bus = bus;
slave->cs = cs;
+ slave->max_transfer_length = ESPI_MAX_DATA_TRANSFER_LEN;
/* Enable eSPI interface */
espi->mode = ESPI_MODE_RXTHR(3) | ESPI_MODE_TXTHR(4) | ESPI_MODE_EN;
@@ -153,6 +156,9 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
const void *data_out,
unsigned char *ch;
int num_bytes = len % 4;
+ if (t->data_len > ESPI_MAX_DATA_TRANSFER_LEN)
+ return -1;
+
debug("spi_xfer: slave %u:%u dout %08X(%08x) din %08X(%08x) len %u\n",
slave->bus, slave->cs, *(uint *) dout,
dout, *(uint *) din, din, len);
diff --git a/include/spi.h b/include/spi.h
index 423899f..b0e13d5 100644
--- a/include/spi.h
+++ b/include/spi.h
@@ -77,12 +77,14 @@ struct espi_transfer {
*
* bus: ID of the bus that the slave is attached to.
* cs: ID of the chip select connected to the slave.
+ * max_txn_length: maximum data transfer length supported by the slave.
* transfer: Represent an eSPI transaction.
*/
struct spi_slave {
unsigned int bus;
unsigned int cs;
+ unsigned int max_transfer_length;
struct espi_transfer *transfer;
};
--
1.6.4
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