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Merge remote-tracking branch 'spi/topic/tegra114' into spi-next

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This commit is contained in:
Mark Brown 2013-10-25 09:51:40 +01:00
commit 176c51c1e4
1 changed files with 68 additions and 17 deletions
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85
drivers/spi/spi-tegra114.c
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@ -182,6 +182,7 @@ struct tegra_spi_data {
u32 cur_speed;
struct spi_device *cur_spi;
struct spi_device *cs_control;
unsigned cur_pos;
unsigned cur_len;
unsigned words_per_32bit;
@ -676,15 +677,12 @@ static void tegra_spi_deinit_dma_param(struct tegra_spi_data *tspi,
dma_release_channel(dma_chan);
}
static int tegra_spi_start_transfer_one(struct spi_device *spi,
struct spi_transfer *t, bool is_first_of_msg,
bool is_single_xfer)
static unsigned long tegra_spi_setup_transfer_one(struct spi_device *spi,
struct spi_transfer *t, bool is_first_of_msg)
{
struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master);
u32 speed = t->speed_hz;
u8 bits_per_word = t->bits_per_word;
unsigned total_fifo_words;
int ret;
unsigned long command1;
int req_mode;
@ -698,7 +696,6 @@ static int tegra_spi_start_transfer_one(struct spi_device *spi,
tspi->cur_rx_pos = 0;
tspi->cur_tx_pos = 0;
tspi->curr_xfer = t;
total_fifo_words = tegra_spi_calculate_curr_xfer_param(spi, tspi, t);
if (is_first_of_msg) {
tegra_spi_clear_status(tspi);
@ -717,7 +714,12 @@ static int tegra_spi_start_transfer_one(struct spi_device *spi,
else if (req_mode == SPI_MODE_3)
command1 |= SPI_CONTROL_MODE_3;
tegra_spi_writel(tspi, command1, SPI_COMMAND1);
if (tspi->cs_control) {
if (tspi->cs_control != spi)
tegra_spi_writel(tspi, command1, SPI_COMMAND1);
tspi->cs_control = NULL;
} else
tegra_spi_writel(tspi, command1, SPI_COMMAND1);
command1 |= SPI_CS_SW_HW;
if (spi->mode & SPI_CS_HIGH)
@ -732,6 +734,18 @@ static int tegra_spi_start_transfer_one(struct spi_device *spi,
command1 |= SPI_BIT_LENGTH(bits_per_word - 1);
}
return command1;
}
static int tegra_spi_start_transfer_one(struct spi_device *spi,
struct spi_transfer *t, unsigned long command1)
{
struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master);
unsigned total_fifo_words;
int ret;
total_fifo_words = tegra_spi_calculate_curr_xfer_param(spi, tspi, t);
if (tspi->is_packed)
command1 |= SPI_PACKED;
@ -803,29 +817,50 @@ static int tegra_spi_setup(struct spi_device *spi)
return 0;
}
static void tegra_spi_transfer_delay(int delay)
{
if (!delay)
return;
if (delay >= 1000)
mdelay(delay / 1000);
udelay(delay % 1000);
}
static int tegra_spi_transfer_one_message(struct spi_master *master,
struct spi_message *msg)
{
bool is_first_msg = true;
int single_xfer;
struct tegra_spi_data *tspi = spi_master_get_devdata(master);
struct spi_transfer *xfer;
struct spi_device *spi = msg->spi;
int ret;
bool skip = false;
msg->status = 0;
msg->actual_length = 0;
single_xfer = list_is_singular(&msg->transfers);
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
unsigned long cmd1;
INIT_COMPLETION(tspi->xfer_completion);
ret = tegra_spi_start_transfer_one(spi, xfer,
is_first_msg, single_xfer);
cmd1 = tegra_spi_setup_transfer_one(spi, xfer, is_first_msg);
if (!xfer->len) {
ret = 0;
skip = true;
goto complete_xfer;
}
ret = tegra_spi_start_transfer_one(spi, xfer, cmd1);
if (ret < 0) {
dev_err(tspi->dev,
"spi can not start transfer, err %d\n", ret);
goto exit;
goto complete_xfer;
}
is_first_msg = false;
ret = wait_for_completion_timeout(&tspi->xfer_completion,
SPI_DMA_TIMEOUT);
@ -833,24 +868,40 @@ static int tegra_spi_transfer_one_message(struct spi_master *master,
dev_err(tspi->dev,
"spi trasfer timeout, err %d\n", ret);
ret = -EIO;
goto exit;
goto complete_xfer;
}
if (tspi->tx_status || tspi->rx_status) {
dev_err(tspi->dev, "Error in Transfer\n");
ret = -EIO;
goto exit;
goto complete_xfer;
}
msg->actual_length += xfer->len;
if (xfer->cs_change && xfer->delay_usecs) {
complete_xfer:
if (ret < 0 || skip) {
tegra_spi_writel(tspi, tspi->def_command1_reg,
SPI_COMMAND1);
udelay(xfer->delay_usecs);
tegra_spi_transfer_delay(xfer->delay_usecs);
goto exit;
} else if (msg->transfers.prev == &xfer->transfer_list) {
/* This is the last transfer in message */
if (xfer->cs_change)
tspi->cs_control = spi;
else {
tegra_spi_writel(tspi, tspi->def_command1_reg,
SPI_COMMAND1);
tegra_spi_transfer_delay(xfer->delay_usecs);
}
} else if (xfer->cs_change) {
tegra_spi_writel(tspi, tspi->def_command1_reg,
SPI_COMMAND1);
tegra_spi_transfer_delay(xfer->delay_usecs);
}
}
ret = 0;
exit:
tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1);
msg->status = ret;
spi_finalize_current_message(master);
return ret;