Current sh-hspi had wrong write/read method which was not linux standard. If spi_transfer requests tx[2], rx[2] len=2, then, driver should run tx[0], rx[0], tx[1], rx[1]. But current sh-hspi runs tx[0], tx[1], rx[0], rx[1]. This patch fixes it up.
Signed-off-by: Kuninori Morimoto <[email protected]> --- drivers/spi/spi-sh-hspi.c | 93 ++++++++++++--------------------------------- 1 files changed, 24 insertions(+), 69 deletions(-) diff --git a/drivers/spi/spi-sh-hspi.c b/drivers/spi/spi-sh-hspi.c index 5784734..934138c 100644 --- a/drivers/spi/spi-sh-hspi.c +++ b/drivers/spi/spi-sh-hspi.c @@ -86,66 +86,6 @@ static int hspi_status_check_timeout(struct hspi_priv *hspi, u32 mask, u32 val) return -ETIMEDOUT; } -static int hspi_push(struct hspi_priv *hspi, struct spi_message *msg, - struct spi_transfer *t) -{ - int i, ret; - u8 *data = (u8 *)t->tx_buf; - - /* - * FIXME - * very simple, but polling transfer - */ - for (i = 0; i < t->len; i++) { - /* wait remains */ - ret = hspi_status_check_timeout(hspi, 0x1, 0x0); - if (ret < 0) - return ret; - - hspi_write(hspi, SPTBR, (u32)data[i]); - - /* wait recive */ - ret = hspi_status_check_timeout(hspi, 0x4, 0x4); - if (ret < 0) - return ret; - - /* dummy read */ - hspi_read(hspi, SPRBR); - } - - return 0; -} - -static int hspi_pop(struct hspi_priv *hspi, struct spi_message *msg, - struct spi_transfer *t) -{ - int i, ret; - u8 *data = (u8 *)t->rx_buf; - - /* - * FIXME - * very simple, but polling receive - */ - for (i = 0; i < t->len; i++) { - /* wait remains */ - ret = hspi_status_check_timeout(hspi, 0x1, 0); - if (ret < 0) - return ret; - - /* dummy write */ - hspi_write(hspi, SPTBR, 0x0); - - /* wait recive */ - ret = hspi_status_check_timeout(hspi, 0x4, 0x4); - if (ret < 0) - return ret; - - data[i] = (u8)hspi_read(hspi, SPRBR); - } - - return 0; -} - /* * spi master function */ @@ -223,7 +163,9 @@ static int hspi_transfer_one_message(struct spi_master *master, { struct hspi_priv *hspi = spi_master_get_devdata(master); struct spi_transfer *t; - int ret; + u32 tx; + u32 rx; + int ret, i; dev_dbg(hspi->dev, "%s\n", __func__); @@ -231,19 +173,32 @@ static int hspi_transfer_one_message(struct spi_master *master, list_for_each_entry(t, &msg->transfers, transfer_list) { hspi_hw_setup(hspi, msg, t); - if (t->tx_buf) { - ret = hspi_push(hspi, msg, t); + for (i = 0; i < t->len; i++) { + + /* wait remains */ + ret = hspi_status_check_timeout(hspi, 0x1, 0); if (ret < 0) - goto error; - } - if (t->rx_buf) { - ret = hspi_pop(hspi, msg, t); + break; + + tx = 0; + if (t->tx_buf) + tx = (u32)((u8 *)t->tx_buf)[i]; + + hspi_write(hspi, SPTBR, tx); + + /* wait recive */ + ret = hspi_status_check_timeout(hspi, 0x4, 0x4); if (ret < 0) - goto error; + break; + + rx = hspi_read(hspi, SPRBR); + if (t->rx_buf) + ((u8 *)t->rx_buf)[i] = (u8)rx; + } + msg->actual_length += t->len; } -error: msg->status = ret; spi_finalize_current_message(master); -- 1.7.5.4 ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ spi-devel-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/spi-devel-general
