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| author | David S. Miller <davem@davemloft.net> | 2015-03-10 06:38:02 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-03-10 06:38:02 +0300 |
| commit | 3cef5c5b0b56f3f90b0e9ff8d3f8dc57f464cc14 (patch) | |
| tree | 02e95f15bd8a04071a9a36f534a92a066a8ce66a /drivers/spi/spi-ti-qspi.c | |
| parent | 8ac467e837a24eb024177b4b01013d8e6764913a (diff) | |
| parent | affb8172de395a6e1db52ed9790ca0456d8c29a9 (diff) | |
| download | linux-3cef5c5b0b56f3f90b0e9ff8d3f8dc57f464cc14.tar.xz | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Conflicts:
drivers/net/ethernet/cadence/macb.c
Overlapping changes in macb driver, mostly fixes and cleanups
in 'net' overlapping with the integration of at91_ether into
macb in 'net-next'.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/spi/spi-ti-qspi.c')
| -rw-r--r-- | drivers/spi/spi-ti-qspi.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/spi/spi-ti-qspi.c b/drivers/spi/spi-ti-qspi.c index 884a716e50cb..5c0616870358 100644 --- a/drivers/spi/spi-ti-qspi.c +++ b/drivers/spi/spi-ti-qspi.c @@ -101,6 +101,7 @@ struct ti_qspi { #define QSPI_FLEN(n) ((n - 1) << 0) /* STATUS REGISTER */ +#define BUSY 0x01 #define WC 0x02 /* INTERRUPT REGISTER */ @@ -199,6 +200,21 @@ static void ti_qspi_restore_ctx(struct ti_qspi *qspi) ti_qspi_write(qspi, ctx_reg->clkctrl, QSPI_SPI_CLOCK_CNTRL_REG); } +static inline u32 qspi_is_busy(struct ti_qspi *qspi) +{ + u32 stat; + unsigned long timeout = jiffies + QSPI_COMPLETION_TIMEOUT; + + stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG); + while ((stat & BUSY) && time_after(timeout, jiffies)) { + cpu_relax(); + stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG); + } + + WARN(stat & BUSY, "qspi busy\n"); + return stat & BUSY; +} + static int qspi_write_msg(struct ti_qspi *qspi, struct spi_transfer *t) { int wlen, count; @@ -211,6 +227,9 @@ static int qspi_write_msg(struct ti_qspi *qspi, struct spi_transfer *t) wlen = t->bits_per_word >> 3; /* in bytes */ while (count) { + if (qspi_is_busy(qspi)) + return -EBUSY; + switch (wlen) { case 1: dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %02x\n", @@ -266,6 +285,9 @@ static int qspi_read_msg(struct ti_qspi *qspi, struct spi_transfer *t) while (count) { dev_dbg(qspi->dev, "rx cmd %08x dc %08x\n", cmd, qspi->dc); + if (qspi_is_busy(qspi)) + return -EBUSY; + ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG); if (!wait_for_completion_timeout(&qspi->transfer_complete, QSPI_COMPLETION_TIMEOUT)) { |