[PATCH 1/2] riscv: ultrarisc: 8250_dw: support DP1000 uart

[Jia Wang]

From: Zhang Xincheng <zhangxincheng at ultrarisc.com>

The UART of DP1000 does not support automatic detection of
buffer size. skip_autocfg needs to be set to true

Signed-off-by: Zhang Xincheng <zhangxincheng at ultrarisc.com>
Signed-off-by: Jia Wang <wangjia at ultrarisc.com>
---
 drivers/tty/serial/8250/8250_dw.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index db73b2ae17fa..6a2acf173331 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -56,6 +56,7 @@
 #define DW_UART_QUIRK_IS_DMA_FC		BIT(3)
 #define DW_UART_QUIRK_APMC0D08		BIT(4)
 #define DW_UART_QUIRK_CPR_VALUE		BIT(5)
+#define DW_UART_QUIRK_FIXED_TYPE	BIT(6)
 
 struct dw8250_platform_data {
 	u8 usr_reg;
@@ -514,6 +515,11 @@ static void dw8250_quirks(struct uart_port *p, struct dw8250_data *data)
 		data->data.dma.prepare_tx_dma = dw8250_prepare_tx_dma;
 		data->data.dma.prepare_rx_dma = dw8250_prepare_rx_dma;
 	}
+	if (quirks & DW_UART_QUIRK_FIXED_TYPE) {
+		p->flags |= UPF_FIXED_TYPE;
+		p->type = PORT_16550A;
+		data->skip_autocfg = true;
+	}
 	if (quirks & DW_UART_QUIRK_APMC0D08) {
 		p->iotype = UPIO_MEM32;
 		p->regshift = 2;
@@ -789,6 +795,11 @@ static const struct dw8250_platform_data dw8250_skip_set_rate_data = {
 	.quirks = DW_UART_QUIRK_SKIP_SET_RATE,
 };
 
+static const struct dw8250_platform_data dw8250_ultrarisc_dp1000_data = {
+	.usr_reg = DW_UART_USR,
+	.quirks = DW_UART_QUIRK_FIXED_TYPE,
+};
+
 static const struct of_device_id dw8250_of_match[] = {
 	{ .compatible = "snps,dw-apb-uart", .data = &dw8250_dw_apb },
 	{ .compatible = "cavium,octeon-3860-uart", .data = &dw8250_octeon_3860_data },
@@ -796,6 +807,7 @@ static const struct of_device_id dw8250_of_match[] = {
 	{ .compatible = "renesas,rzn1-uart", .data = &dw8250_renesas_rzn1_data },
 	{ .compatible = "sophgo,sg2044-uart", .data = &dw8250_skip_set_rate_data },
 	{ .compatible = "starfive,jh7100-uart", .data = &dw8250_skip_set_rate_data },
+	{ .compatible = "ultrarisc,dp1000-uart", .data = &dw8250_ultrarisc_dp1000_data },
 	{ /* Sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, dw8250_of_match);

-- 
2.34.1