[U-Boot] [RFC][PATCH v4] ARM: mxs: Added application UART driver

Andreas Wass
2013-08-14T08:09:25Z

The driver makes it possible to use an application UART as
the U-Boot output console for Freescale i.MX23/i.MX28 devices.

Signed-off-by: Andreas Wass <andreas.wass@dalelven.com>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Marek Vasut <marex@denx.de>
---
Changes for v2:
- Added comment that regs-uartapp.h is pulled from LTIB
- BM_ prefixes removed and _MASK suffixes added instead
- BP_ prefixes removed and _OFFSET suffixes added instead
- BF_ defines removed altogether
- CONFIG_MXS_AUART_CLK renamed to MXS_AUART_CLK and guarding ifndef removed
- Added comments describing what is set and unset during init of driver
- Added newline that was accidently removed from serial.c

Changes for v3:
- All BV_ values are now on the form (value << something)
- BV_ prefix removed and double underscore substituted with a single
- File comment of mxs_auart.c now attributes what the driver is based on
- Uses gd->baudrate instead of CONFIG_BAUDRATE
- If gd->baudrate is 0 it reverts back to CONFIG_BAUDRATE
- Checks the validity of the div value calculated when setting the baudrate
- Magic numbers are now defines instead
- Cleanup of comments
- Cleanup of commit message

Changes for v4:
- Fixed UARTAPP_LINECTRL2_WLEN_*BITS values

drivers/serial/Makefile | 1 +
drivers/serial/mxs_auart.c | 151 ++++++++++++++++
drivers/serial/serial.c | 2 +
4 files changed, 403 insertions(+)
create mode 100644 arch/arm/include/asm/arch-mxs/regs-uartapp.h
create mode 100644 drivers/serial/mxs_auart.c

diff --git a/arch/arm/include/asm/arch-mxs/regs-uartapp.h b/arch/arm/include/asm/arch-mxs/regs-uartapp.h
new file mode 100644
index 0000000..abd62c2
--- /dev/null
+++ b/arch/arm/include/asm/arch-mxs/regs-uartapp.h
@@ -0,0 +1,249 @@
+/*
+ * Freescale MXS UARTAPP Register Definitions
+ *
+ * Copyright (C) 2013 Andreas Wass <andreas.wass@dalelven.com>
+ *
+ * Based on code from LTIB:
+ * Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef __ARCH_ARM___MXS_UARTAPP_H
+#define __ARCH_ARM___MXS_UARTAPP_H
+
+#include <asm/imx-common/regs-common.h>
+
+#ifndef __ASSEMBLY__
+struct mxs_uartapp_regs {
+ mxs_reg_32(hw_uartapp_ctrl0)
+ mxs_reg_32(hw_uartapp_ctrl1)
+ mxs_reg_32(hw_uartapp_ctrl2)
+ mxs_reg_32(hw_uartapp_linectrl)
+ mxs_reg_32(hw_uartapp_linectrl2)
+ mxs_reg_32(hw_uartapp_intr)
+ mxs_reg_32(hw_uartapp_data)
+ mxs_reg_32(hw_uartapp_stat)
+ mxs_reg_32(hw_uartapp_debug)
+ mxs_reg_32(hw_uartapp_version)
+ mxs_reg_32(hw_uartapp_autobaud)
+};
+#endif
+
+
+#define UARTAPP_CTRL0_SFTRST_MASK (1 << 31)
+#define UARTAPP_CTRL0_CLKGATE_MASK (1 << 30)
+#define UARTAPP_CTRL0_RUN_MASK (1 << 29)
+#define UARTAPP_CTRL0_RX_SOURCE_MASK (1 << 28)
+#define UARTAPP_CTRL0_RXTO_ENABLE_MASK (1 << 27)
+#define UARTAPP_CTRL0_RXTIMEOUT_OFFSET (1 << 4)
+#define UARTAPP_CTRL0_RXTIMEOUT_MASK 0x07FF0000
+#define UARTAPP_CTRL0_XFER_COUNT_OFFSET 0
+#define UARTAPP_CTRL0_XFER_COUNT_MASK 0x0000FFFF
+
+#define UARTAPP_CTRL1_RSVD2_OFFSET 29
+#define UARTAPP_CTRL1_RSVD2_MASK 0xE0000000
+
+#define UARTAPP_CTRL1_RUN_MASK (1 << 28)
+#define UARTAPP_CTRL1_RSVD1_OFFSET 16
+#define UARTAPP_CTRL1_RSVD1_MASK 0x0FFF0000
+
+#define UARTAPP_CTRL1_XFER_COUNT_OFFSET 0
+#define UARTAPP_CTRL1_XFER_COUNT_MASK 0x0000FFFF
+
+#define UARTAPP_CTRL2_INVERT_RTS_MASK (1 << 31)
+#define UARTAPP_CTRL2_INVERT_CTS_MASK (1 << 30)
+#define UARTAPP_CTRL2_INVERT_TX_MASK (1 << 29)
+#define UARTAPP_CTRL2_INVERT_RX_MASK (1 << 28)
+#define UARTAPP_CTRL2_RTS_SEMAPHORE_MASK (1 << 27)
+#define UARTAPP_CTRL2_DMAONERR_MASK (1 << 26)
+#define UARTAPP_CTRL2_TXDMAE_MASK (1 << 25)
+#define UARTAPP_CTRL2_RXDMAE_MASK (1 << 24)
+#define UARTAPP_CTRL2_RSVD2_MASK (1 << 23)
+#define UARTAPP_CTRL2_RXIFLSEL_OFFSET 20
+#define UARTAPP_CTRL2_RXIFLSEL_MASK 0x00700000
+
+#define UARTAPP_CTRL2_RXIFLSEL_NOT_EMPTY (0x0 << 20)
+#define UARTAPP_CTRL2_RXIFLSEL_ONE_QUARTER (0x1 << 20)
+#define UARTAPP_CTRL2_RXIFLSEL_ONE_HALF (0x2 << 20)
+#define UARTAPP_CTRL2_RXIFLSEL_THREE_QUARTERS (0x3 << 20)
+#define UARTAPP_CTRL2_RXIFLSEL_SEVEN_EIGHTHS (0x4 << 20)
+#define UARTAPP_CTRL2_RXIFLSEL_INVALID5 (0x5 << 20)
+#define UARTAPP_CTRL2_RXIFLSEL_INVALID6 (0x6 << 20)
+#define UARTAPP_CTRL2_RXIFLSEL_INVALID7 (0x7 << 20)
+#define UARTAPP_CTRL2_RSVD3_MASK (1 << 19)
+#define UARTAPP_CTRL2_TXIFLSEL_OFFSET 16
+#define UARTAPP_CTRL2_TXIFLSEL_MASK 0x00070000
+#define UARTAPP_CTRL2_TXIFLSEL_EMPTY (0x0 << 16)
+#define UARTAPP_CTRL2_TXIFLSEL_ONE_QUARTER (0x1 << 16)
+#define UARTAPP_CTRL2_TXIFLSEL_ONE_HALF (0x2 << 16)
+#define UARTAPP_CTRL2_TXIFLSEL_THREE_QUARTERS (0x3 << 16)
+#define UARTAPP_CTRL2_TXIFLSEL_SEVEN_EIGHTHS (0x4 << 16)
+#define UARTAPP_CTRL2_TXIFLSEL_INVALID5 (0x5 << 16)
+#define UARTAPP_CTRL2_TXIFLSEL_INVALID6 (0x6 << 16)
+#define UARTAPP_CTRL2_TXIFLSEL_INVALID7 (0x7 << 16)
+#define UARTAPP_CTRL2_CTSEN_MASK (1 << 15)
+#define UARTAPP_CTRL2_RTSEN_MASK (1 << 14)
+#define UARTAPP_CTRL2_OUT2_MASK (1 << 13)
+#define UARTAPP_CTRL2_OUT1_MASK (1 << 12)
+#define UARTAPP_CTRL2_RTS_MASK (1 << 11)
+#define UARTAPP_CTRL2_DTR_MASK (1 << 10)
+#define UARTAPP_CTRL2_RXE_MASK (1 << 9)
+#define UARTAPP_CTRL2_TXE_MASK (1 << 8)
+#define UARTAPP_CTRL2_LBE_MASK (1 << 7)
+#define UARTAPP_CTRL2_USE_LCR2_MASK (1 << 6)
+#define UARTAPP_CTRL2_RSVD4_OFFSET 3
+#define UARTAPP_CTRL2_RSVD4_MASK 0x00000038
+
+#define UARTAPP_CTRL2_SIRLP_MASK (1 << 2)
+#define UARTAPP_CTRL2_SIREN_MASK (1 << 1)
+#define UARTAPP_CTRL2_UARTEN_MASK (1 << 0)
+
+#define UARTAPP_LINECTRL_BAUD_DIVINT_OFFSET 16
+#define UARTAPP_LINECTRL_BAUD_DIVINT_MASK 0xFFFF0000
+#define UARTAPP_LINECTRL_EXTRACT_BAUD_DIVINT_OFFSET 6
+
+#define UARTAPP_LINECTRL_RSVD_OFFSET 14
+#define UARTAPP_LINECTRL_RSVD_MASK 0x0000C000
+
+#define UARTAPP_LINECTRL_BAUD_DIVFRAC_OFFSET 8
+#define UARTAPP_LINECTRL_BAUD_DIVFRAC_MASK 0x00003F00
+#define UARTAPP_LINECTRL_EXTRACT_BAUD_DIVFRAC_MASK 0x0000003F
+
+#define UARTAPP_LINECTRL_SPS_MASK (1 << 7)
+#define UARTAPP_LINECTRL_WLEN_OFFSET 5
+#define UARTAPP_LINECTRL_WLEN_MASK 0x00000060
+#define UARTAPP_LINECTRL_WLEN_5BITS (0x00 << 5)
+#define UARTAPP_LINECTRL_WLEN_6BITS (0x01 << 5)
+#define UARTAPP_LINECTRL_WLEN_7BITS (0x02 << 5)
+#define UARTAPP_LINECTRL_WLEN_8BITS (0x03 << 5)
+
+#define UARTAPP_LINECTRL_FEN_MASK (1 << 4)
+#define UARTAPP_LINECTRL_STP2_MASK (1 << 3)
+#define UARTAPP_LINECTRL_EPS_MASK (1 << 2)
+#define UARTAPP_LINECTRL_PEN_MASK (1 << 1)
+#define UARTAPP_LINECTRL_BRK_MASK (1 << 0)
+
+#define UARTAPP_LINECTRL2_BAUD_DIVINT_OFFSET 16
+#define UARTAPP_LINECTRL2_BAUD_DIVINT_MASK 0xFFFF0000
+#define UARTAPP_LINECTRL2_EXTRACT_BAUD_DIVINT_OFFSET 6
+
+#define UARTAPP_LINECTRL2_RSVD_OFFSET 14
+#define UARTAPP_LINECTRL2_RSVD_MASK 0x0000C000
+
+#define UARTAPP_LINECTRL2_BAUD_DIVFRAC_OFFSET 8
+#define UARTAPP_LINECTRL2_BAUD_DIVFRAC_MASK 0x00003F00
+#define UARTAPP_LINECTRL2_EXTRACT_BAUD_DIVFRAC_MASK 0x0000003F
+
+#define UARTAPP_LINECTRL2_SPS_MASK (1 << 7)
+#define UARTAPP_LINECTRL2_WLEN_OFFSET 5
+#define UARTAPP_LINECTRL2_WLEN_MASK 0x00000060
+#define UARTAPP_LINECTRL2_WLEN_5BITS (0x00 << 5)
+#define UARTAPP_LINECTRL2_WLEN_6BITS (0x01 << 5)
+#define UARTAPP_LINECTRL2_WLEN_7BITS (0x02 << 5)
+#define UARTAPP_LINECTRL2_WLEN_8BITS (0x03 << 5)
+
+
+#define UARTAPP_LINECTRL2_FEN_MASK (1 << 4)
+#define UARTAPP_LINECTRL2_STP2_MASK (1 << 3)
+#define UARTAPP_LINECTRL2_EPS_MASK (1 << 2)
+#define UARTAPP_LINECTRL2_PEN_MASK (1 << 1)
+#define UARTAPP_LINECTRL2_RSVD1_MASK (1 << 0)
+
+#define UARTAPP_INTR_RSVD1_OFFSET 28
+#define UARTAPP_INTR_RSVD1_MASK 0xF0000000
+
+#define UARTAPP_INTR_ABDIEN_MASK (1 << 27)
+#define UARTAPP_INTR_OEIEN_MASK (1 << 26)
+#define UARTAPP_INTR_BEIEN_MASK (1 << 25)
+#define UARTAPP_INTR_PEIEN_MASK (1 << 24)
+#define UARTAPP_INTR_FEIEN_MASK (1 << 23)
+#define UARTAPP_INTR_RTIEN_MASK (1 << 22)
+#define UARTAPP_INTR_TXIEN_MASK (1 << 21)
+#define UARTAPP_INTR_RXIEN_MASK (1 << 20)
+#define UARTAPP_INTR_DSRMIEN_MASK (1 << 19)
+#define UARTAPP_INTR_DCDMIEN_MASK (1 << 18)
+#define UARTAPP_INTR_CTSMIEN_MASK (1 << 17)
+#define UARTAPP_INTR_RIMIEN_MASK (1 << 16)
+#define UARTAPP_INTR_RSVD2_OFFSET 12
+#define UARTAPP_INTR_RSVD2_MASK 0x0000F000
+
+#define UARTAPP_INTR_ABDIS_MASK (1 << 11)
+#define UARTAPP_INTR_OEIS_MASK (1 << 10)
+#define UARTAPP_INTR_BEIS_MASK (1 << 9)
+#define UARTAPP_INTR_PEIS_MASK (1 << 8)
+#define UARTAPP_INTR_FEIS_MASK (1 << 7)
+#define UARTAPP_INTR_RTIS_MASK (1 << 6)
+#define UARTAPP_INTR_TXIS_MASK (1 << 5)
+#define UARTAPP_INTR_RXIS_MASK (1 << 4)
+#define UARTAPP_INTR_DSRMIS_MASK (1 << 3)
+#define UARTAPP_INTR_DCDMIS_MASK (1 << 2)
+#define UARTAPP_INTR_CTSMIS_MASK (1 << 1)
+#define UARTAPP_INTR_RIMIS_MASK (1 << 0)
+
+#define UARTAPP_DATA_DATA_OFFSET 0
+#define UARTAPP_DATA_DATA_MASK 0xFFFFFFFF
+#define UARTAPP_STAT_PRESENT_MASK (1 << 31)
+#define UARTAPP_STAT_PRESENT_UNAVAILABLE (0x0 << 31)
+#define UARTAPP_STAT_PRESENT_AVAILABLE (0x1 << 31)
+
+#define UARTAPP_STAT_HISPEED_MASK (1 << 30)
+#define UARTAPP_STAT_HISPEED_UNAVAILABLE (0x0 << 30)
+#define UARTAPP_STAT_HISPEED_AVAILABLE (0x1 << 30)
+
+#define UARTAPP_STAT_BUSY_MASK (1 << 29)
+#define UARTAPP_STAT_CTS_MASK (1 << 28)
+#define UARTAPP_STAT_TXFE_MASK (1 << 27)
+#define UARTAPP_STAT_RXFF_MASK (1 << 26)
+#define UARTAPP_STAT_TXFF_MASK (1 << 25)
+#define UARTAPP_STAT_RXFE_MASK (1 << 24)
+#define UARTAPP_STAT_RXBYTE_INVALID_OFFSET 20
+#define UARTAPP_STAT_RXBYTE_INVALID_MASK 0x00F00000
+
+#define UARTAPP_STAT_OERR_MASK (1 << 19)
+#define UARTAPP_STAT_BERR_MASK (1 << 18)
+#define UARTAPP_STAT_PERR_MASK (1 << 17)
+#define UARTAPP_STAT_FERR_MASK (1 << 16)
+#define UARTAPP_STAT_RXCOUNT_OFFSET 0
+#define UARTAPP_STAT_RXCOUNT_MASK 0x0000FFFF
+
+#define UARTAPP_DEBUG_RXIBAUD_DIV_OFFSET 16
+#define UARTAPP_DEBUG_RXIBAUD_DIV_MASK 0xFFFF0000
+
+#define UARTAPP_DEBUG_RXFBAUD_DIV_OFFSET 10
+#define UARTAPP_DEBUG_RXFBAUD_DIV_MASK 0x0000FC00
+
+#define UARTAPP_DEBUG_RSVD1_OFFSET 6
+#define UARTAPP_DEBUG_RSVD1_MASK 0x000003C0
+
+#define UARTAPP_DEBUG_TXDMARUN_MASK (1 << 5)
+#define UARTAPP_DEBUG_RXDMARUN_MASK (1 << 4)
+#define UARTAPP_DEBUG_TXCMDEND_MASK (1 << 3)
+#define UARTAPP_DEBUG_RXCMDEND_MASK (1 << 2)
+#define UARTAPP_DEBUG_TXDMARQ_MASK (1 << 1)
+#define UARTAPP_DEBUG_RXDMARQ_MASK (1 << 0)
+
+#define UARTAPP_VERSION_MAJOR_OFFSET 24
+#define UARTAPP_VERSION_MAJOR_MASK 0xFF000000
+
+#define UARTAPP_VERSION_MINOR_OFFSET 16
+#define UARTAPP_VERSION_MINOR_MASK 0x00FF0000
+
+#define UARTAPP_VERSION_STEP_OFFSET 0
+#define UARTAPP_VERSION_STEP_MASK 0x0000FFFF
+
+#define UARTAPP_AUTOBAUD_REFCHAR1_OFFSET 24
+#define UARTAPP_AUTOBAUD_REFCHAR1_MASK 0xFF000000
+
+#define UARTAPP_AUTOBAUD_REFCHAR0_OFFSET 16
+#define UARTAPP_AUTOBAUD_REFCHAR0_MASK 0x00FF0000
+
+#define UARTAPP_AUTOBAUD_RSVD1_OFFSET 5
+#define UARTAPP_AUTOBAUD_RSVD1_MASK 0x0000FFE0
+
+#define UARTAPP_AUTOBAUD_UPDATE_TX_MASK (1 << 4)
+#define UARTAPP_AUTOBAUD_TWO_REF_CHARS_MASK (1 << 3)
+#define UARTAPP_AUTOBAUD_START_WITH_RUNBIT_MASK (1 << 2)
+#define UARTAPP_AUTOBAUD_START_BAUD_DETECT_MASK (1 << 1)
+#define UARTAPP_AUTOBAUD_BAUD_DETECT_ENABLE_MASK (1 << 0)
+#endif /* __ARCH_ARM___UARTAPP_H */
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index 697f2bb..4c45bfa 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -38,6 +38,7 @@ COBJS-$(CONFIG_SCIF_CONSOLE) += serial_sh.o
COBJS-$(CONFIG_ZYNQ_SERIAL) += serial_zynq.o
COBJS-$(CONFIG_BFIN_SERIAL) += serial_bfin.o
COBJS-$(CONFIG_FSL_LPUART) += serial_lpuart.o
+COBJS-$(CONFIG_MXS_AUART) += mxs_auart.o

ifndef CONFIG_SPL_BUILD
COBJS-$(CONFIG_USB_TTY) += usbtty.o
diff --git a/drivers/serial/mxs_auart.c b/drivers/serial/mxs_auart.c
new file mode 100644
index 0000000..7cfe5bc
--- /dev/null
+++ b/drivers/serial/mxs_auart.c
@@ -0,0 +1,151 @@
+/*
+ * Freescale i.MX23/i.MX28 AUART driver
+ *
+ * Copyright (C) 2013 Andreas Wass <andreas.wass@dalelven.com>
+ *
+ * Based on the MXC serial driver:
+ *
+ * (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>
+ *
+ * Further based on the Linux mxs-auart.c driver:
+ *
+ * Freescale STMP37XX/STMP38X Application UART drkiver
+ * Copyright 2008-2010 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+#include <common.h>
+#include <asm/io.h>
+#include <serial.h>
+#include <linux/compiler.h>
+#include <asm/arch/regs-base.h>
+#include <asm/arch/regs-uartapp.h>
+#include <asm/arch/sys_proto.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifndef CONFIG_MXS_AUART_BASE
+#error "CONFIG_MXS_AUART_BASE must be set to the base UART to use"
+#endif
+
+/* AUART clock always supplied by XTAL and always 24MHz */
+#define MXS_AUART_CLK 24000000
+
+static struct mxs_uartapp_regs *get_uartapp_registers(void)
+{
+ return (struct mxs_uartapp_regs *)CONFIG_MXS_AUART_BASE;
+}
+
+/**
+ * Sets the baud rate and settings.
+ * The settings are: 8 data bits, no parit and 1 stop bit.
+ */
+void mxs_auart_setbrg(void)
+{
+ u32 div;
+ u32 linectrl = 0;
+ struct mxs_uartapp_regs *regs = get_uartapp_registers();
+
+ if (!gd->baudrate)
+ gd->baudrate = CONFIG_BAUDRATE;
+
+ /*
+ * From i.MX28 datasheet:
+ * div is calculated by calculating UARTCLK*32/baudrate, rounded to int
+ * div must be between 0xEC and 0x003FFFC0 inclusive
+ * Lowest 6 bits of div goes in BAUD_DIVFRAC part of LINECTRL register
+ * Next 16 bits goes in BAUD_DIVINT part of LINECTRL register
+ */
+ div = (MXS_AUART_CLK * 32) / gd->baudrate;
+ if (div < 0xEC || div > 0x003FFFC0)
+ return;
+
+ linectrl |= ((div & UARTAPP_LINECTRL_EXTRACT_BAUD_DIVFRAC_MASK) <<
+ UARTAPP_LINECTRL_BAUD_DIVFRAC_OFFSET) &
+ UARTAPP_LINECTRL_BAUD_DIVFRAC_MASK;
+ linectrl |= ((div >> UARTAPP_LINECTRL_EXTRACT_BAUD_DIVINT_OFFSET) <<
+ UARTAPP_LINECTRL_BAUD_DIVINT_OFFSET) &
+ UARTAPP_LINECTRL_BAUD_DIVINT_MASK;
+
+ /* Word length: 8 bits */
+ linectrl |= UARTAPP_LINECTRL_WLEN_8BITS;
+
+ /* Enable FIFOs. */
+ linectrl |= UARTAPP_LINECTRL_FEN_MASK;
+
+ /* Write above settings, no parity, 1 stop bit */
+ writel(linectrl, &regs->hw_uartapp_linectrl);
+}
+
+int mxs_auart_init(void)
+{
+ struct mxs_uartapp_regs *regs = get_uartapp_registers();
+ /* Reset everything */
+ mxs_reset_block(&regs->hw_uartapp_ctrl0_reg);
+ /* Disable interrupts */
+ writel(0, &regs->hw_uartapp_intr);
+ /* Set baud rate and settings */
+ serial_setbrg();
+ /* Disable RTS and CTS, ignore LINECTRL2 register */
+ writel(UARTAPP_CTRL2_RTSEN_MASK |
+ UARTAPP_CTRL2_CTSEN_MASK |
+ UARTAPP_CTRL2_USE_LCR2_MASK,
+ &regs->hw_uartapp_ctrl2_clr);
+ /* Enable receiver, transmitter and UART */
+ writel(UARTAPP_CTRL2_RXE_MASK |
+ UARTAPP_CTRL2_TXE_MASK |
+ UARTAPP_CTRL2_UARTEN_MASK,
+ &regs->hw_uartapp_ctrl2_set);
+ return 0;
+}
+
+void mxs_auart_putc(const char c)
+{
+ struct mxs_uartapp_regs *regs = get_uartapp_registers();
+ /* Wait in loop while the transmit FIFO is full */
+ while (readl(&regs->hw_uartapp_stat) & UARTAPP_STAT_TXFF_MASK)
+ ;
+
+ writel(c, &regs->hw_uartapp_data);
+
+ if (c == '\n')
+ mxs_auart_putc('\r');
+}
+
+int mxs_auart_tstc(void)
+{
+ struct mxs_uartapp_regs *regs = get_uartapp_registers();
+ /* Checks if receive FIFO is empty */
+ return !(readl(&regs->hw_uartapp_stat) & UARTAPP_STAT_RXFE_MASK);
+}
+
+int mxs_auart_getc(void)
+{
+ struct mxs_uartapp_regs *regs = get_uartapp_registers();
+ /* Wait until a character is available to read */
+ while (!mxs_auart_tstc())
+ ;
+ /* Read the character from the data register */
+ return readl(&regs->hw_uartapp_data) & 0xFF;
+}
+
+static struct serial_device mxs_auart_drv = {
+ .name = "mxs_auart_serial",
+ .start = mxs_auart_init,
+ .stop = NULL,
+ .setbrg = mxs_auart_setbrg,
+ .putc = mxs_auart_putc,
+ .puts = default_serial_puts,
+ .getc = mxs_auart_getc,
+ .tstc = mxs_auart_tstc,
+};
+
+void mxs_auart_initialize(void)
+{
+ serial_register(&mxs_auart_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+ return &mxs_auart_drv;
+}
diff --git a/drivers/serial/serial.c b/drivers/serial/serial.c
index 6730135..336ff35 100644
--- a/drivers/serial/serial.c
+++ b/drivers/serial/serial.c
@@ -159,6 +159,7 @@ serial_initfunc(pl01x_serial_initialize);
serial_initfunc(s3c44b0_serial_initialize);
serial_initfunc(sa1100_serial_initialize);
serial_initfunc(sh_serial_initialize);
+serial_initfunc(mxs_auart_initialize);

/**
* serial_register() - Register serial driver with serial driver core
@@ -251,6 +252,7 @@ void serial_initialize(void)
s3c44b0_serial_initialize();
sa1100_serial_initialize();
sh_serial_initialize();
+ mxs_auart_initialize();

serial_assign(default_serial_console()->name);
}
--
1.8.1.4