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tty: serial: fsl_lpuart: add LS1028A support

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The LS1028A uses little endian register access and has a different FIFO
size encoding.

Signed-off-by: Michael Walle <michael@walle.cc>
Link: https://lore.kernel.org/r/20200306214433.23215-4-michael@walle.cc
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Walle 2020-03-06 22:44:32 +01:00 committed by Greg Kroah-Hartman
parent a092ab25fd
commit c2f448cff2
1 changed files with 25 additions and 2 deletions
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27
drivers/tty/serial/fsl_lpuart.c
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@ -234,6 +234,7 @@ static DEFINE_IDA(fsl_lpuart_ida);
enum lpuart_type {
VF610_LPUART,
LS1021A_LPUART,
LS1028A_LPUART,
IMX7ULP_LPUART,
IMX8QXP_LPUART,
};
@ -278,11 +279,16 @@ static const struct lpuart_soc_data vf_data = {
.iotype = UPIO_MEM,
};
static const struct lpuart_soc_data ls_data = {
static const struct lpuart_soc_data ls1021a_data = {
.devtype = LS1021A_LPUART,
.iotype = UPIO_MEM32BE,
};
static const struct lpuart_soc_data ls1028a_data = {
.devtype = LS1028A_LPUART,
.iotype = UPIO_MEM32,
};
static struct lpuart_soc_data imx7ulp_data = {
.devtype = IMX7ULP_LPUART,
.iotype = UPIO_MEM32,
@ -297,7 +303,8 @@ static struct lpuart_soc_data imx8qxp_data = {
static const struct of_device_id lpuart_dt_ids[] = {
{ .compatible = "fsl,vf610-lpuart", .data = &vf_data, },
{ .compatible = "fsl,ls1021a-lpuart", .data = &ls_data, },
{ .compatible = "fsl,ls1021a-lpuart", .data = &ls1021a_data, },
{ .compatible = "fsl,ls1028a-lpuart", .data = &ls1028a_data, },
{ .compatible = "fsl,imx7ulp-lpuart", .data = &imx7ulp_data, },
{ .compatible = "fsl,imx8qxp-lpuart", .data = &imx8qxp_data, },
{ /* sentinel */ }
@ -307,6 +314,11 @@ MODULE_DEVICE_TABLE(of, lpuart_dt_ids);
/* Forward declare this for the dma callbacks*/
static void lpuart_dma_tx_complete(void *arg);
static inline bool is_ls1028a_lpuart(struct lpuart_port *sport)
{
return sport->devtype == LS1028A_LPUART;
}
static inline bool is_imx8qxp_lpuart(struct lpuart_port *sport)
{
return sport->devtype == IMX8QXP_LPUART;
@ -1626,6 +1638,17 @@ static int lpuart32_startup(struct uart_port *port)
sport->rxfifo_size = UARTFIFO_DEPTH((temp >> UARTFIFO_RXSIZE_OFF) &
UARTFIFO_FIFOSIZE_MASK);
/*
* The LS1028A has a fixed length of 16 words. Although it supports the
* RX/TXSIZE fields their encoding is different. Eg the reference manual
* states 0b101 is 16 words.
*/
if (is_ls1028a_lpuart(sport)) {
sport->rxfifo_size = 16;
sport->txfifo_size = 16;
sport->port.fifosize = sport->txfifo_size;
}
spin_lock_irqsave(&sport->port.lock, flags);
lpuart32_setup_watermark_enable(sport);