From: Peng Fan
The i.MX LPUART Documentation:
https://www.nxp.com/webapp/Download?colCode=IMX8QMIEC
Chatper 13.6 Low Power Universal Asynchronous Receiver/
Transmitter (LPUART)
Tested-by: Henry Wang
Signed-off-by: Peng Fan
---
xen/arch/arm/include/asm/imx-lpuart.h | 64 ++
xen/drivers/char/Kconfig | 7 +
xen/drivers/char/Makefile | 1 +
xen/drivers/char/imx-lpuart.c | 276 ++
4 files changed, 348 insertions(+)
create mode 100644 xen/arch/arm/include/asm/imx-lpuart.h
create mode 100644 xen/drivers/char/imx-lpuart.c
diff --git a/xen/arch/arm/include/asm/imx-lpuart.h
b/xen/arch/arm/include/asm/imx-lpuart.h
new file mode 100644
index 00..111640edb4
--- /dev/null
+++ b/xen/arch/arm/include/asm/imx-lpuart.h
@@ -0,0 +1,64 @@
+/*
+ * xen/arch/arm/include/asm/imx-lpuart.h
+ *
+ * Common constant definition between early printk and the LPUART driver
+ *
+ * Peng Fan
+ * Copyright 2022 NXP
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __ASM_ARM_IMX_LPUART_H__
+#define __ASM_ARM_IMX_LPUART_H__
+
+/* 32-bit register definition */
+#define UARTBAUD (0x10)
+#define UARTSTAT (0x14)
+#define UARTCTRL (0x18)
+#define UARTDATA (0x1C)
+#define UARTMATCH (0x20)
+#define UARTMODIR (0x24)
+#define UARTFIFO (0x28)
+#define UARTWATER (0x2c)
+
+#define UARTSTAT_TDRE BIT(23)
+#define UARTSTAT_TC BIT(22)
+#define UARTSTAT_RDRF BIT(21)
+#define UARTSTAT_OR BIT(19)
+
+#define UARTBAUD_OSR_SHIFT (24)
+#define UARTBAUD_OSR_MASK (0x1f)
+#define UARTBAUD_SBR_MASK (0x1fff)
+#define UARTBAUD_BOTHEDGE (0x0002)
+#define UARTBAUD_TDMAE(0x0080)
+#define UARTBAUD_RDMAE(0x0020)
+
+#define UARTCTRL_TIE BIT(23)
+#define UARTCTRL_TCIE BIT(22)
+#define UARTCTRL_RIE BIT(21)
+#define UARTCTRL_ILIE BIT(20)
+#define UARTCTRL_TE BIT(19)
+#define UARTCTRL_RE BIT(18)
+#define UARTCTRL_MBIT(4)
+
+#define UARTWATER_RXCNT_OFF 24
+
+#endif /* __ASM_ARM_IMX_LPUART_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/drivers/char/Kconfig b/xen/drivers/char/Kconfig
index 2ff5b288e2..e5f7b1d8eb 100644
--- a/xen/drivers/char/Kconfig
+++ b/xen/drivers/char/Kconfig
@@ -13,6 +13,13 @@ config HAS_CADENCE_UART
This selects the Xilinx Zynq Cadence UART. If you have a Xilinx Zynq
based board, say Y.
+config HAS_IMX_LPUART
+ bool "i.MX LPUART driver"
+ default y
+ depends on ARM_64
+ help
+ This selects the i.MX LPUART. If you have i.MX8QM based board, say Y.
+
config HAS_MVEBU
bool "Marvell MVEBU UART driver"
default y
diff --git a/xen/drivers/char/Makefile b/xen/drivers/char/Makefile
index 7c646d771c..14e67cf072 100644
--- a/xen/drivers/char/Makefile
+++ b/xen/drivers/char/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_HAS_MVEBU) += mvebu-uart.o
obj-$(CONFIG_HAS_OMAP) += omap-uart.o
obj-$(CONFIG_HAS_SCIF) += scif-uart.o
obj-$(CONFIG_HAS_EHCI) += ehci-dbgp.o
+obj-$(CONFIG_HAS_IMX_LPUART) += imx-lpuart.o
obj-$(CONFIG_ARM) += arm-uart.o
obj-y += serial.o
obj-$(CONFIG_XEN_GUEST) += xen_pv_console.o
diff --git a/xen/drivers/char/imx-lpuart.c b/xen/drivers/char/imx-lpuart.c
new file mode 100644
index 00..df44f91e5d
--- /dev/null
+++ b/xen/drivers/char/imx-lpuart.c
@@ -0,0 +1,276 @@
+/*
+ * xen/drivers/char/imx-lpuart.c
+ *
+ * Driver for i.MX LPUART.
+ *
+ * Peng Fan
+ * Copyright 2022 NXP
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+
+#define imx_lpuart_read(uart, off) readl((uart)->regs + off)
+#define imx_lpuart_write(uart, off, val) writel((val), (uart)->regs + off)
+
+static struct imx_lpuart {
+uint32_t baud, clock_hz, data_bits, parity, stop_bits, fifo_size;
+uint32_t irq;
+char __iomem *regs;
+struct irqaction
