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author | 2013-10-05 12:23:38 +0100 | |
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committer | 2013-10-17 10:57:47 +0100 | |
commit | 63fc184cde2d771affc2e7885c05a2792bae9f86 (patch) | |
tree | 2876e182ab6c39159dff711d30ac551fac369527 /drivers/spi/spi-tegra20-slink.c | |
parent | spi: tegra20-slink: Fix checkpatch issue (diff) | |
download | linux-63fc184cde2d771affc2e7885c05a2792bae9f86.tar.gz linux-63fc184cde2d771affc2e7885c05a2792bae9f86.tar.bz2 linux-63fc184cde2d771affc2e7885c05a2792bae9f86.zip |
spi/tegra20-slink: Crude refactoring to use core message parsing
This is a half done conversion with minimal code reorganisation provided
for bisection purposes. A further patch will move the first transfer
preparation into tegra_slink_prepare_message().
The cs_change and udelay handling is removed, these should be
implemented by the framework and in any case are buggy - the two fields
should not be related and the cs_change handling appears to at best only
work the first time it's used in a message.
Signed-off-by: Mark Brown <broonie@linaro.org>
Tested-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'drivers/spi/spi-tegra20-slink.c')
-rw-r--r-- | drivers/spi/spi-tegra20-slink.c | 88 |
1 files changed, 46 insertions, 42 deletions
diff --git a/drivers/spi/spi-tegra20-slink.c b/drivers/spi/spi-tegra20-slink.c index d1d2bff01301..3576fcb3f79b 100644 --- a/drivers/spi/spi-tegra20-slink.c +++ b/drivers/spi/spi-tegra20-slink.c @@ -196,6 +196,7 @@ struct tegra_slink_data { u32 rx_status; u32 status_reg; bool is_packed; + bool is_first_msg; unsigned long packed_size; u32 command_reg; @@ -823,55 +824,56 @@ static int tegra_slink_setup(struct spi_device *spi) return 0; } -static int tegra_slink_transfer_one_message(struct spi_master *master, - struct spi_message *msg) +static int tegra_slink_prepare_message(struct spi_master *master, + struct spi_message *msg) { - bool is_first_msg = true; struct tegra_slink_data *tspi = spi_master_get_devdata(master); - struct spi_transfer *xfer; - struct spi_device *spi = msg->spi; - int ret; - msg->status = 0; - msg->actual_length = 0; + tspi->is_first_msg = true; - list_for_each_entry(xfer, &msg->transfers, transfer_list) { - INIT_COMPLETION(tspi->xfer_completion); - ret = tegra_slink_start_transfer_one(spi, xfer, is_first_msg); - if (ret < 0) { - dev_err(tspi->dev, - "spi can not start transfer, err %d\n", ret); - goto exit; - } - is_first_msg = false; - ret = wait_for_completion_timeout(&tspi->xfer_completion, - SLINK_DMA_TIMEOUT); - if (WARN_ON(ret == 0)) { - dev_err(tspi->dev, - "spi trasfer timeout, err %d\n", ret); - ret = -EIO; - goto exit; - } + return 0; +} - if (tspi->tx_status || tspi->rx_status) { - dev_err(tspi->dev, "Error in Transfer\n"); - ret = -EIO; - goto exit; - } - msg->actual_length += xfer->len; - if (xfer->cs_change && xfer->delay_usecs) { - tegra_slink_writel(tspi, tspi->def_command_reg, - SLINK_COMMAND); - udelay(xfer->delay_usecs); - } +static int tegra_slink_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct tegra_slink_data *tspi = spi_master_get_devdata(master); + int ret; + + INIT_COMPLETION(tspi->xfer_completion); + ret = tegra_slink_start_transfer_one(spi, xfer, tspi->is_first_msg); + if (ret < 0) { + dev_err(tspi->dev, + "spi can not start transfer, err %d\n", ret); + return ret; } - ret = 0; -exit: + tspi->is_first_msg = false; + ret = wait_for_completion_timeout(&tspi->xfer_completion, + SLINK_DMA_TIMEOUT); + if (WARN_ON(ret == 0)) { + dev_err(tspi->dev, + "spi trasfer timeout, err %d\n", ret); + return -EIO; + } + + if (tspi->tx_status) + return tspi->tx_status; + if (tspi->rx_status) + return tspi->rx_status; + + return 0; +} + +static int tegra_slink_unprepare_message(struct spi_master *master, + struct spi_message *msg) +{ + struct tegra_slink_data *tspi = spi_master_get_devdata(master); + tegra_slink_writel(tspi, tspi->def_command_reg, SLINK_COMMAND); tegra_slink_writel(tspi, tspi->def_command2_reg, SLINK_COMMAND2); - msg->status = ret; - spi_finalize_current_message(master); - return ret; + + return 0; } static irqreturn_t handle_cpu_based_xfer(struct tegra_slink_data *tspi) @@ -1074,7 +1076,9 @@ static int tegra_slink_probe(struct platform_device *pdev) /* the spi->mode bits understood by this driver: */ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; master->setup = tegra_slink_setup; - master->transfer_one_message = tegra_slink_transfer_one_message; + master->prepare_message = tegra_slink_prepare_message; + master->transfer_one = tegra_slink_transfer_one; + master->unprepare_message = tegra_slink_unprepare_message; master->auto_runtime_pm = true; master->num_chipselect = MAX_CHIP_SELECT; master->bus_num = -1; |