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path: root/drivers/spi/spi-tegra20-slink.c
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Diffstat (limited to 'drivers/spi/spi-tegra20-slink.c')
-rw-r--r--drivers/spi/spi-tegra20-slink.c144
1 files changed, 69 insertions, 75 deletions
diff --git a/drivers/spi/spi-tegra20-slink.c b/drivers/spi/spi-tegra20-slink.c
index c70353672a23..af0a67886ae8 100644
--- a/drivers/spi/spi-tegra20-slink.c
+++ b/drivers/spi/spi-tegra20-slink.c
@@ -278,12 +278,12 @@ static unsigned tegra_slink_calculate_curr_xfer_param(
{
unsigned remain_len = t->len - tspi->cur_pos;
unsigned max_word;
- unsigned bits_per_word ;
+ unsigned bits_per_word;
unsigned max_len;
unsigned total_fifo_words;
bits_per_word = t->bits_per_word;
- tspi->bytes_per_word = (bits_per_word - 1) / 8 + 1;
+ tspi->bytes_per_word = DIV_ROUND_UP(bits_per_word, 8);
if (bits_per_word == 8 || bits_per_word == 16) {
tspi->is_packed = 1;
@@ -707,8 +707,7 @@ static void tegra_slink_deinit_dma_param(struct tegra_slink_data *tspi,
}
static int tegra_slink_start_transfer_one(struct spi_device *spi,
- struct spi_transfer *t, bool is_first_of_msg,
- bool is_single_xfer)
+ struct spi_transfer *t)
{
struct tegra_slink_data *tspi = spi_master_get_devdata(spi->master);
u32 speed;
@@ -732,32 +731,12 @@ static int tegra_slink_start_transfer_one(struct spi_device *spi,
tspi->curr_xfer = t;
total_fifo_words = tegra_slink_calculate_curr_xfer_param(spi, tspi, t);
- if (is_first_of_msg) {
- tegra_slink_clear_status(tspi);
+ command = tspi->command_reg;
+ command &= ~SLINK_BIT_LENGTH(~0);
+ command |= SLINK_BIT_LENGTH(bits_per_word - 1);
- command = tspi->def_command_reg;
- command |= SLINK_BIT_LENGTH(bits_per_word - 1);
- command |= SLINK_CS_SW | SLINK_CS_VALUE;
-
- command2 = tspi->def_command2_reg;
- command2 |= SLINK_SS_EN_CS(spi->chip_select);
-
- command &= ~SLINK_MODES;
- if (spi->mode & SPI_CPHA)
- command |= SLINK_CK_SDA;
-
- if (spi->mode & SPI_CPOL)
- command |= SLINK_IDLE_SCLK_DRIVE_HIGH;
- else
- command |= SLINK_IDLE_SCLK_DRIVE_LOW;
- } else {
- command = tspi->command_reg;
- command &= ~SLINK_BIT_LENGTH(~0);
- command |= SLINK_BIT_LENGTH(bits_per_word - 1);
-
- command2 = tspi->command2_reg;
- command2 &= ~(SLINK_RXEN | SLINK_TXEN);
- }
+ command2 = tspi->command2_reg;
+ command2 &= ~(SLINK_RXEN | SLINK_TXEN);
tegra_slink_writel(tspi, command, SLINK_COMMAND);
tspi->command_reg = command;
@@ -824,58 +803,72 @@ 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;
- int single_xfer;
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;
+ tegra_slink_clear_status(tspi);
- single_xfer = list_is_singular(&msg->transfers);
- 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, single_xfer);
- 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;
- }
+ tspi->command_reg = tspi->def_command_reg;
+ tspi->command_reg |= SLINK_CS_SW | SLINK_CS_VALUE;
- 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);
- }
+ tspi->command2_reg = tspi->def_command2_reg;
+ tspi->command2_reg |= SLINK_SS_EN_CS(spi->chip_select);
+
+ tspi->command_reg &= ~SLINK_MODES;
+ if (spi->mode & SPI_CPHA)
+ tspi->command_reg |= SLINK_CK_SDA;
+
+ if (spi->mode & SPI_CPOL)
+ tspi->command_reg |= SLINK_IDLE_SCLK_DRIVE_HIGH;
+ else
+ tspi->command_reg |= SLINK_IDLE_SCLK_DRIVE_LOW;
+
+ return 0;
+}
+
+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);
+ if (ret < 0) {
+ dev_err(tspi->dev,
+ "spi can not start transfer, err %d\n", ret);
+ return ret;
}
- ret = 0;
-exit:
+
+ 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)
@@ -1078,7 +1071,9 @@ 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;
@@ -1164,7 +1159,7 @@ static int tegra_slink_probe(struct platform_device *pdev)
pm_runtime_put(&pdev->dev);
master->dev.of_node = pdev->dev.of_node;
- ret = spi_register_master(master);
+ ret = devm_spi_register_master(&pdev->dev, master);
if (ret < 0) {
dev_err(&pdev->dev, "can not register to master err %d\n", ret);
goto exit_pm_disable;
@@ -1191,7 +1186,6 @@ static int tegra_slink_remove(struct platform_device *pdev)
struct tegra_slink_data *tspi = spi_master_get_devdata(master);
free_irq(tspi->irq, tspi);
- spi_unregister_master(master);
if (tspi->tx_dma_chan)
tegra_slink_deinit_dma_param(tspi, false);