imx6Q 4.1.15 early console support
From 2e2f1168059373faf020fb882f3c4d65a5f40c45 Mon Sep 17 00:00:00 2001
From: hongjiujin <hongjiujin@xxx.com>
Date: Thu, 11 Jan 2018 14:04:23 +0800
Subject: [PATCH] linux kernel: support early console and fix mistakes in
includes/dts
Register early console so that kernel can quickly startup.
It can speedup almost 2~3 seconds between "Starting kernel..." and "Uncompressing".
Signed-off-by: hongjiujin <hongjiujin@xxx.com>
---
.../uboot-imx/include/configs/mx6sabre_common.h | 2 +-
.../uboot-imx/include/configs/mx6sabresd.h | 2 +-
device/fsl/sabresd_6dq/BoardConfig.mk | 2 +-
kernel_imx/arch/arm/boot/dts/imx6qdl-sabresd.dtsi | 4 +-
kernel_imx/arch/arm/mach-imx/mach-imx6q.c | 26 ++
kernel_imx/drivers/tty/serial/Makefile | 1 +
kernel_imx/drivers/tty/serial/mxc_uart_early.c | 188 +++++++++++++++
kernel_imx/drivers/tty/serial/mxc_uart_early.h | 267 +++++++++++++++++++++
8 files changed, 487 insertions(+), 5 deletions(-)
create mode 100644 kernel_imx/drivers/tty/serial/mxc_uart_early.c
create mode 100755 kernel_imx/drivers/tty/serial/mxc_uart_early.h
diff --git a/bootable/bootloader/uboot-imx/include/configs/mx6sabre_common.h b/bootable/bootloader/uboot-imx/include/configs/mx6sabre_common.h
index bf30c62..bd062e3 100644
--- a/bootable/bootloader/uboot-imx/include/configs/mx6sabre_common.h
+++ b/bootable/bootloader/uboot-imx/include/configs/mx6sabre_common.h
@@ -90,7 +90,7 @@
/* allow to overwrite serial and ethaddr */
#define CONFIG_ENV_OVERWRITE
-#define CONFIG_CONS_INDEX 1
+#define CONFIG_CONS_INDEX 4 /* UART4 */
#define CONFIG_BAUDRATE 115200
/* Command definition */
diff --git a/bootable/bootloader/uboot-imx/include/configs/mx6sabresd.h b/bootable/bootloader/uboot-imx/include/configs/mx6sabresd.h
index 14f1ce3..cd84c29 100755
--- a/bootable/bootloader/uboot-imx/include/configs/mx6sabresd.h
+++ b/bootable/bootloader/uboot-imx/include/configs/mx6sabresd.h
@@ -27,7 +27,7 @@
#define PHYS_SDRAM_SIZE (1u * 1024 * 1024 * 1024)
#elif defined(CONFIG_MX6Q)
#define CONFIG_DEFAULT_FDT_FILE "imx6q-sabresd.dtb"
-#define PHYS_SDRAM_SIZE (1u * 1024 * 1024 * 1024)
+#define PHYS_SDRAM_SIZE (2u * 1024 * 1024 * 1024)
#elif defined(CONFIG_MX6DL)
#define CONFIG_DEFAULT_FDT_FILE "imx6dl-sabresd.dtb"
#define PHYS_SDRAM_SIZE (1u * 1024 * 1024 * 1024)
diff --git a/device/fsl/sabresd_6dq/BoardConfig.mk b/device/fsl/sabresd_6dq/BoardConfig.mk
index 8fd07e7..cd63be7 100755
--- a/device/fsl/sabresd_6dq/BoardConfig.mk
+++ b/device/fsl/sabresd_6dq/BoardConfig.mk
@@ -109,7 +109,7 @@ $(error "TARGET_USERIMAGES_USE_UBIFS and TARGET_USERIMAGES_USE_EXT4 config open
endif
endif
-BOARD_KERNEL_CMDLINE := console=ttymxc3,115200 init=/init video=mxcfb0:dev=ldb,bpp=32 video=mxcfb1:off video=mxcfb2:off video=mxcfb3:off vmalloc=128M androidboot.console=ttymxc3 consoleblank=0 androidboot.hardware=freescale cma=448M androidboot.selinux=permissive androidboot.dm_verity=disabled loglevel=8 ldo_active=on
+BOARD_KERNEL_CMDLINE := consol=mxcuart,0x21f0000,115200n8 console=ttymxc3,115200 init=/init video=mxcfb0:dev=ldb,bpp=32 video=mxcfb1:off vmalloc=128M androidboot.console=ttymxc3 consoleblank=0 androidboot.hardware=freescale cma=448M androidboot.selinux=permissive androidboot.dm_verity=disabled loglevel=8
ifeq ($(TARGET_USERIMAGES_USE_UBIFS),true)
#UBI boot command line.
diff --git a/kernel_imx/arch/arm/boot/dts/imx6qdl-sabresd.dtsi b/kernel_imx/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
index 91d29a0..67a85e8 100755
--- a/kernel_imx/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
+++ b/kernel_imx/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
@@ -33,7 +33,7 @@
};
chosen {
- stdout-path = &uart1;
+ stdout-path = &uart4;
};
leds {
@@ -47,7 +47,7 @@
};
memory: memory {
- reg = <0x10000000 0x40000000>;
+ reg = <0x10000000 0x80000000>;
};
regulators {
diff --git a/kernel_imx/arch/arm/mach-imx/mach-imx6q.c b/kernel_imx/arch/arm/mach-imx/mach-imx6q.c
index 92f8e84..4ad5e1b 100644
--- a/kernel_imx/arch/arm/mach-imx/mach-imx6q.c
+++ b/kernel_imx/arch/arm/mach-imx/mach-imx6q.c
@@ -196,6 +196,31 @@ static void __init imx6q_enet_phy_init(void)
}
}
+extern int mxc_early_serial_console_init(unsigned long base, struct clk *clk);
+#define MX6Q_UART4_BASE 0x21f0000
+static void __init imx6q_early_serialcon_setup(void)
+{
+ struct device_node *np;
+ struct clk *uart_clk;
+
+ np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-uart");
+ if (!np) {
+ pr_warn("%s: failed to find uart node\n", __func__);
+ return;
+ }
+
+ uart_clk = of_clk_get_by_name(np, "ipg");
+ if (IS_ERR(uart_clk)) {
+ pr_warn("%s: failed to get uart clock\n", __func__);
+ goto put_node;
+ }
+
+ mxc_early_serial_console_init(MX6Q_UART4_BASE, uart_clk);
+
+put_node:
+ of_node_put(np);
+}
+
static void __init imx6q_1588_init(void)
{
struct device_node *np;
@@ -353,6 +378,7 @@ static void __init imx6q_init_machine(void)
of_platform_populate(NULL, of_default_bus_match_table, NULL, parent);
+ imx6q_early_serialcon_setup();
imx6q_enet_init();
imx_anatop_init();
imx6q_csi_mux_init();
diff --git a/kernel_imx/drivers/tty/serial/Makefile b/kernel_imx/drivers/tty/serial/Makefile
index c3ac3d9..ed563d1 100644
--- a/kernel_imx/drivers/tty/serial/Makefile
+++ b/kernel_imx/drivers/tty/serial/Makefile
@@ -44,6 +44,7 @@ obj-$(CONFIG_SERIAL_SH_SCI) += sh-sci.o
obj-$(CONFIG_SERIAL_SGI_L1_CONSOLE) += sn_console.o
obj-$(CONFIG_SERIAL_CPM) += cpm_uart/
obj-$(CONFIG_SERIAL_IMX) += imx.o
+obj-$(CONFIG_SERIAL_IMX_CONSOLE) += mxc_uart_early.o
obj-$(CONFIG_SERIAL_MPC52xx) += mpc52xx_uart.o
obj-$(CONFIG_SERIAL_ICOM) += icom.o
obj-$(CONFIG_SERIAL_M32R_SIO) += m32r_sio.o
diff --git a/kernel_imx/drivers/tty/serial/mxc_uart_early.c b/kernel_imx/drivers/tty/serial/mxc_uart_early.c
new file mode 100644
index 0000000..77eb9e2
--- /dev/null
+++ b/kernel_imx/drivers/tty/serial/mxc_uart_early.c
@@ -0,0 +1,188 @@
+/*
+ * Copyright (C) 2011-2012 Freescale Semiconductor, Inc.
+ *
+ * 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.
+
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/*!
+ * @file drivers/serial/mxc_uart_early.c
+ *
+ * @brief Driver for the Freescale Semiconductor MXC serial ports based on
+ * drivers/char/8250_early.c,
+ * Copyright 2004 Hewlett-Packard Development Company,
+ * L.P.by Bjorn Helgaasby.
+ *
+ * Early serial console for MXC UARTS.
+ *
+ * This is for use before the serial driver has initialized, in
+ * particular, before the UARTs have been discovered and named.
+ * Instead of specifying the console device as, e.g., "ttymxc0",
+ * we locate the device directly by its MMIO or I/O port address.
+ *
+ * The user can specify the device directly, e.g.,
+ * console=mxcuart,0x43f90000,115200n8
+ * or platform code can call early_uart_console_init() to set
+ * the early UART device.
+ *
+ * After the normal serial driver starts, we try to locate the
+ * matching ttymxc device and start a console there.
+ */
+
+/*
+ * Include Files
+ */
+
+#include <linux/tty.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/console.h>
+#include <linux/serial_core.h>
+#include <linux/serial_reg.h>
+#include <linux/clk.h>
+
+#include "mxc_uart_early.h"
+
+struct mxc_early_uart_device {
+ struct uart_port port;
+ char options[16]; /* e.g., 115200n8 */
+ unsigned int baud;
+ struct clk *clk;
+};
+static struct mxc_early_uart_device mxc_early_device __initdata;
+
+/*
+ * Write out a character once the UART is ready
+ */
+static void __init mxcuart_console_write_char(struct uart_port *port, int ch)
+{
+ unsigned int status;
+
+ do {
+ status = readl(port->membase + MXC_UARTUSR2);
+ } while ((status & MXC_UARTUSR2_TXFE) == 0);
+ writel(ch, port->membase + MXC_UARTUTXD);
+}
+
+/*!
+ * This function is called to write the console messages through the UART port.
+ *
+ * @param co the console structure
+ * @param s the log message to be written to the UART
+ * @param count length of the message
+ */
+void __init early_mxcuart_console_write(struct console *co, const char *s,
+ u_int count)
+{
+ struct uart_port *port = &mxc_early_device.port;
+ unsigned int status, oldcr1, oldcr2, oldcr3, cr2, cr3;
+
+ /*
+ * First save the control registers and then disable the interrupts
+ */
+ oldcr1 = readl(port->membase + MXC_UARTUCR1);
+ oldcr2 = readl(port->membase + MXC_UARTUCR2);
+ oldcr3 = readl(port->membase + MXC_UARTUCR3);
+ cr2 =
+ oldcr2 & ~(MXC_UARTUCR2_ATEN | MXC_UARTUCR2_RTSEN |
+ MXC_UARTUCR2_ESCI);
+ cr3 =
+ oldcr3 & ~(MXC_UARTUCR3_DCD | MXC_UARTUCR3_RI |
+ MXC_UARTUCR3_DTRDEN);
+ writel(MXC_UARTUCR1_UARTEN, port->membase + MXC_UARTUCR1);
+ writel(cr2, port->membase + MXC_UARTUCR2);
+ writel(cr3, port->membase + MXC_UARTUCR3);
+
+ /* Transmit string */
+ uart_console_write(port, s, count, mxcuart_console_write_char);
+
+ /*
+ * Finally, wait for the transmitter to become empty
+ */
+ do {
+ status = readl(port->membase + MXC_UARTUSR2);
+ } while (!(status & MXC_UARTUSR2_TXDC));
+
+ /*
+ * Restore the control registers
+ */
+ writel(oldcr1, port->membase + MXC_UARTUCR1);
+ writel(oldcr2, port->membase + MXC_UARTUCR2);
+ writel(oldcr3, port->membase + MXC_UARTUCR3);
+}
+
+static unsigned int __init probe_baud(struct uart_port *port)
+{
+ /* FIXME Return Default Baud Rate */
+ return 115200;
+}
+
+static int __init mxc_early_uart_setup(struct console *console, char *options)
+{
+ struct mxc_early_uart_device *device = &mxc_early_device;
+ struct uart_port *port = &device->port;
+ int length;
+
+ if (device->port.membase || device->port.iobase)
+ return -ENODEV;
+
+ port->uartclk = 5600000;
+ port->iotype = UPIO_MEM;
+ port->membase = ioremap(port->mapbase, SZ_4K);
+
+ if (options) {
+ device->baud = simple_strtoul(options, NULL, 0);
+ length = min(strlen(options), sizeof(device->options));
+ strncpy(device->options, options, length);
+ } else {
+ device->baud = probe_baud(port);
+ snprintf(device->options, sizeof(device->options), "%u",
+ device->baud);
+ }
+ printk(KERN_INFO
+ "MXC_Early serial console at MMIO 0x%x (options '%s')\n",
+ port->mapbase, device->options);
+ return 0;
+}
+
+static struct console mxc_early_uart_console __initdata = {
+ .name = "ttymxc",
+ .write = early_mxcuart_console_write,
+ .setup = mxc_early_uart_setup,
+ .flags = CON_PRINTBUFFER | CON_BOOT,
+ .index = -1,
+};
+
+int __init mxc_early_serial_console_init(unsigned long base, struct clk *clk)
+{
+ mxc_early_device.clk = clk;
+ mxc_early_device.port.mapbase = base;
+
+ register_console(&mxc_early_uart_console);
+ return 0;
+}
+
+int __init mxc_early_uart_console_disable(void)
+{
+ struct mxc_early_uart_device *device = &mxc_early_device;
+ struct uart_port *port = &device->port;
+
+ if (mxc_early_uart_console.index >= 0) {
+ unregister_console(&mxc_early_uart_console);
+ iounmap(port->membase);
+ clk_put(device->clk);
+ }
+ return 0;
+}
+late_initcall_sync(mxc_early_uart_console_disable);
diff --git a/kernel_imx/drivers/tty/serial/mxc_uart_early.h b/kernel_imx/drivers/tty/serial/mxc_uart_early.h
new file mode 100755
index 0000000..689aaad
--- /dev/null
+++ b/kernel_imx/drivers/tty/serial/mxc_uart_early.h
@@ -0,0 +1,267 @@
+/*
+ * Copyright 2004-2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+
+/*
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+/*!
+ * @defgroup UART Universal Asynchronous Receiver Transmitter (UART) Driver
+ */
+
+/*!
+ * @file arch-mxc/mxc_uart.h
+ *
+ * @brief This file contains the UART configuration structure definition.
+ *
+ *
+ * @ingroup UART
+ */
+
+#ifndef __ASM_ARCH_MXC_UART_H__
+#define __ASM_ARCH_MXC_UART_H__
+
+#ifdef __KERNEL__
+
+#include <linux/serial_core.h>
+
+/*
+ * The modes of the UART ports
+ */
+#define MODE_DTE 0
+#define MODE_DCE 1
+/*
+ * Is the UART configured to be a IR port
+ */
+#define IRDA 0
+#define NO_IRDA 1
+
+/*!
+ * This structure is used to store the the physical and virtual
+ * addresses of the UART DMA receive buffer.
+ */
+typedef struct {
+ /*!
+ * DMA Receive buffer virtual address
+ */
+ char *rx_buf;
+ /*!
+ * DMA Receive buffer physical address
+ */
+ dma_addr_t rx_handle;
+} mxc_uart_rxdmamap;
+
+/*!
+ * This structure is a way for the low level driver to define their own
+ * \b uart_port structure. This structure includes the core \b uart_port
+ * structure that is provided by Linux as an element and has other
+ * elements that are specifically required by this low-level driver.
+ */
+typedef struct {
+ /*!
+ * The port structure holds all the information about the UART
+ * port like base address, and so on.
+ */
+ struct uart_port port;
+ /*!
+ * Flag to determine if the interrupts are muxed.
+ */
+ int ints_muxed;
+ /*!
+ * Array that holds the receive and master interrupt numbers
+ * when the interrupts are not muxed.
+ */
+ int irqs[2];
+ /*!
+ * Flag to determine the DTE/DCE mode.
+ */
+ int mode;
+ /*!
+ * Flag to hold the IR mode of the port.
+ */
+ int ir_mode;
+ /*!
+ * Flag to enable/disable the UART port.
+ */
+ int enabled;
+ /*!
+ * Flag to indicate if we wish to use hardware-driven hardware
+ * flow control.
+ */
+ int hardware_flow;
+ /*!
+ * Holds the threshold value at which the CTS line is deasserted in
+ * case we use hardware-driven hardware flow control.
+ */
+ unsigned int cts_threshold;
+ /*!
+ * Flag to enable/disable DMA data transfer.
+ */
+ int dma_enabled;
+ /*!
+ * Holds the DMA receive buffer size.
+ */
+ int dma_rxbuf_size;
+ /*!
+ * DMA Receive buffers information
+ */
+ mxc_uart_rxdmamap *rx_dmamap;
+ /*!
+ * DMA RX buffer id
+ */
+ int dma_rxbuf_id;
+ /*!
+ * DMA Transmit buffer virtual address
+ */
+ char *tx_buf;
+ /*!
+ * DMA Transmit buffer physical address
+ */
+ dma_addr_t tx_handle;
+ /*!
+ * Holds the RxFIFO threshold value.
+ */
+ unsigned int rx_threshold;
+ /*!
+ * Holds the TxFIFO threshold value.
+ */
+ unsigned int tx_threshold;
+ /*!
+ * Information whether this is a shared UART
+ */
+ unsigned int shared;
+ /*!
+ * Clock id for UART clock
+ */
+ struct clk *clk;
+ /*!
+ * Information whether RXDMUXSEL must be set or not for IR port
+ */
+ int rxd_mux;
+ int ir_tx_inv;
+ int ir_rx_inv;
+} uart_mxc_port;
+
+/* Address offsets of the UART registers */
+#define MXC_UARTURXD 0x000 /* Receive reg */
+#define MXC_UARTUTXD 0x040 /* Transmitter reg */
+#define MXC_UARTUCR1 0x080 /* Control reg 1 */
+#define MXC_UARTUCR2 0x084 /* Control reg 2 */
+#define MXC_UARTUCR3 0x088 /* Control reg 3 */
+#define MXC_UARTUCR4 0x08C /* Control reg 4 */
+#define MXC_UARTUFCR 0x090 /* FIFO control reg */
+#define MXC_UARTUSR1 0x094 /* Status reg 1 */
+#define MXC_UARTUSR2 0x098 /* Status reg 2 */
+#define MXC_UARTUESC 0x09C /* Escape character reg */
+#define MXC_UARTUTIM 0x0A0 /* Escape timer reg */
+#define MXC_UARTUBIR 0x0A4 /* BRM incremental reg */
+#define MXC_UARTUBMR 0x0A8 /* BRM modulator reg */
+#define MXC_UARTUBRC 0x0AC /* Baud rate count reg */
+#define MXC_UARTONEMS 0x0B0 /* One millisecond reg */
+#define MXC_UARTUTS 0x0B4 /* Test reg */
+#define MXC_UARTUMCR 0x0B8 /* RS485 Mode control */
+
+/* Bit definations of UCR1 */
+#define MXC_UARTUCR1_ADEN 0x8000
+#define MXC_UARTUCR1_ADBR 0x4000
+#define MXC_UARTUCR1_TRDYEN 0x2000
+#define MXC_UARTUCR1_IDEN 0x1000
+#define MXC_UARTUCR1_RRDYEN 0x0200
+#define MXC_UARTUCR1_RXDMAEN 0x0100
+#define MXC_UARTUCR1_IREN 0x0080
+#define MXC_UARTUCR1_TXMPTYEN 0x0040
+#define MXC_UARTUCR1_RTSDEN 0x0020
+#define MXC_UARTUCR1_SNDBRK 0x0010
+#define MXC_UARTUCR1_TXDMAEN 0x0008
+#define MXC_UARTUCR1_ATDMAEN 0x0004
+#define MXC_UARTUCR1_DOZE 0x0002
+#define MXC_UARTUCR1_UARTEN 0x0001
+
+/* Bit definations of UCR2 */
+#define MXC_UARTUCR2_ESCI 0x8000
+#define MXC_UARTUCR2_IRTS 0x4000
+#define MXC_UARTUCR2_CTSC 0x2000
+#define MXC_UARTUCR2_CTS 0x1000
+#define MXC_UARTUCR2_PREN 0x0100
+#define MXC_UARTUCR2_PROE 0x0080
+#define MXC_UARTUCR2_STPB 0x0040
+#define MXC_UARTUCR2_WS 0x0020
+#define MXC_UARTUCR2_RTSEN 0x0010
+#define MXC_UARTUCR2_ATEN 0x0008
+#define MXC_UARTUCR2_TXEN 0x0004
+#define MXC_UARTUCR2_RXEN 0x0002
+#define MXC_UARTUCR2_SRST 0x0001
+
+/* Bit definations of UCR3 */
+#define MXC_UARTUCR3_DTREN 0x2000
+#define MXC_UARTUCR3_PARERREN 0x1000
+#define MXC_UARTUCR3_FRAERREN 0x0800
+#define MXC_UARTUCR3_DSR 0x0400
+#define MXC_UARTUCR3_DCD 0x0200
+#define MXC_UARTUCR3_RI 0x0100
+#define MXC_UARTUCR3_RXDSEN 0x0040
+#define MXC_UARTUCR3_AWAKEN 0x0010
+#define MXC_UARTUCR3_DTRDEN 0x0008
+#define MXC_UARTUCR3_RXDMUXSEL 0x0004
+#define MXC_UARTUCR3_INVT 0x0002
+
+/* Bit definations of UCR4 */
+#define MXC_UARTUCR4_CTSTL_OFFSET 10
+#define MXC_UARTUCR4_CTSTL_MASK (0x3F << 10)
+#define MXC_UARTUCR4_INVR 0x0200
+#define MXC_UARTUCR4_ENIRI 0x0100
+#define MXC_UARTUCR4_REF16 0x0040
+#define MXC_UARTUCR4_IRSC 0x0020
+#define MXC_UARTUCR4_TCEN 0x0008
+#define MXC_UARTUCR4_OREN 0x0002
+#define MXC_UARTUCR4_DREN 0x0001
+
+/* Bit definations of UFCR */
+#define MXC_UARTUFCR_RFDIV 0x0200 /* Ref freq div is set to 2 */
+#define MXC_UARTUFCR_RFDIV_OFFSET 7
+#define MXC_UARTUFCR_RFDIV_MASK (0x7 << 7)
+#define MXC_UARTUFCR_TXTL_OFFSET 10
+#define MXC_UARTUFCR_DCEDTE 0x0040
+
+/* Bit definations of URXD */
+#define MXC_UARTURXD_ERR 0x4000
+#define MXC_UARTURXD_OVRRUN 0x2000
+#define MXC_UARTURXD_FRMERR 0x1000
+#define MXC_UARTURXD_BRK 0x0800
+#define MXC_UARTURXD_PRERR 0x0400
+
+/* Bit definations of USR1 */
+#define MXC_UARTUSR1_PARITYERR 0x8000
+#define MXC_UARTUSR1_RTSS 0x4000
+#define MXC_UARTUSR1_TRDY 0x2000
+#define MXC_UARTUSR1_RTSD 0x1000
+#define MXC_UARTUSR1_FRAMERR 0x0400
+#define MXC_UARTUSR1_RRDY 0x0200
+#define MXC_UARTUSR1_AGTIM 0x0100
+#define MXC_UARTUSR1_DTRD 0x0080
+#define MXC_UARTUSR1_AWAKE 0x0010
+
+/* Bit definations of USR2 */
+#define MXC_UARTUSR2_TXFE 0x4000
+#define MXC_UARTUSR2_IDLE 0x1000
+#define MXC_UARTUSR2_RIDELT 0x0400
+#define MXC_UARTUSR2_RIIN 0x0200
+#define MXC_UARTUSR2_DCDDELT 0x0040
+#define MXC_UARTUSR2_DCDIN 0x0020
+#define MXC_UARTUSR2_TXDC 0x0008
+#define MXC_UARTUSR2_ORE 0x0002
+#define MXC_UARTUSR2_RDR 0x0001
+#define MXC_UARTUSR2_BRCD 0x0004
+
+/* Bit definations of UTS */
+#define MXC_UARTUTS_LOOP 0x1000
+
+#endif /* __KERNEL__ */
+
+#endif /* __ASM_ARCH_MXC_UART_H__ */
--
2.7.4
posted on 2018-01-11 15:17 hongjiujing 阅读(606) 评论(0) 编辑 收藏 举报
