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serial: tegra: add support to use 8 bytes trigger 

Add support to use 8 bytes trigger for Tegra186 SOC.

Signed-off-by: Shardar Shariff Md <smohammed@nvidia.com>
Signed-off-by: Krishna Yarlagadda <kyarlagadda@nvidia.com>
Link: https://lore.kernel.org/r/1567572187-29820-9-git-send-email-kyarlagadda@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Krishna Yarlagadda 2019-09-04 10:13:03 +05:30 committed by Greg Kroah-Hartman
parent 53d0a062cb
commit 7799a3aa81
1 changed files with 11 additions and 2 deletions
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13
drivers/tty/serial/serial-tegra.c
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@ -88,6 +88,7 @@ struct tegra_uart_chip_data {
bool support_clk_src_div;
bool fifo_mode_enable_status;
int uart_max_port;
int max_dma_burst_bytes;
};
struct tegra_uart_port {
@ -931,7 +932,12 @@ static int tegra_uart_hw_init(struct tegra_uart_port *tup)
* programmed in the DMA registers.
*/
tup->fcr_shadow = UART_FCR_ENABLE_FIFO;
tup->fcr_shadow |= UART_FCR_R_TRIG_01;
if (tup->cdata->max_dma_burst_bytes == 8)
tup->fcr_shadow |= UART_FCR_R_TRIG_10;
else
tup->fcr_shadow |= UART_FCR_R_TRIG_01;
tup->fcr_shadow |= TEGRA_UART_TX_TRIG_16B;
tegra_uart_write(tup, tup->fcr_shadow, UART_FCR);
@ -1045,7 +1051,7 @@ static int tegra_uart_dma_channel_allocate(struct tegra_uart_port *tup,
}
dma_sconfig.src_addr = tup->uport.mapbase;
dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
dma_sconfig.src_maxburst = 4;
dma_sconfig.src_maxburst = tup->cdata->max_dma_burst_bytes;
tup->rx_dma_chan = dma_chan;
tup->rx_dma_buf_virt = dma_buf;
tup->rx_dma_buf_phys = dma_phys;
@ -1324,6 +1330,7 @@ static struct tegra_uart_chip_data tegra20_uart_chip_data = {
.support_clk_src_div = false,
.fifo_mode_enable_status = false,
.uart_max_port = 5,
.max_dma_burst_bytes = 4,
};
static struct tegra_uart_chip_data tegra30_uart_chip_data = {
@ -1332,6 +1339,7 @@ static struct tegra_uart_chip_data tegra30_uart_chip_data = {
.support_clk_src_div = true,
.fifo_mode_enable_status = false,
.uart_max_port = 5,
.max_dma_burst_bytes = 4,
};
static struct tegra_uart_chip_data tegra186_uart_chip_data = {
@ -1340,6 +1348,7 @@ static struct tegra_uart_chip_data tegra186_uart_chip_data = {
.support_clk_src_div = true,
.fifo_mode_enable_status = true,
.uart_max_port = 8,
.max_dma_burst_bytes = 8,
};
static const struct of_device_id tegra_uart_of_match[] = {