[U-Boot] [RFC][PATCH] ARM: mxs: Added application UART driver
Andreas Wass
andreas.wass at dalelven.com
Sun Aug 11 20:48:56 CEST 2013
The driver is ported from a driver that was implemented
using u-boot 2009.
The driver makes it possible to use a regular application UART as
the U-Boot output console for MXS CPUs.
Signed-off-by: Andreas Wass <andreas.wass at dalelven.com>
Cc: Fabio Estevam <fabio.estevam at freescale.com>
Cc: Marek Vasut <marex at denx.de>
---
arch/arm/include/asm/arch-mxs/regs-uartapp.h | 321 +++++++++++++++++++++++++++
drivers/serial/Makefile | 1 +
drivers/serial/mxs_auart.c | 118 ++++++++++
drivers/serial/serial.c | 3 +-
4 files changed, 442 insertions(+), 1 deletion(-)
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..5e871b6
--- /dev/null
+++ b/arch/arm/include/asm/arch-mxs/regs-uartapp.h
@@ -0,0 +1,321 @@
+/*
+ * Freescale MXS UARTAPP Register Definitions
+ *
+ * Copyright (C) 2013 Andreas Wass <andreas.wass at dalelven.com>
+ *
+ * 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 BM_UARTAPP_CTRL0_SFTRST (1 << 31)
+#define BM_UARTAPP_CTRL0_CLKGATE (1 << 30)
+#define BM_UARTAPP_CTRL0_RUN (1 << 29)
+#define BM_UARTAPP_CTRL0_RX_SOURCE (1 << 28)
+#define BM_UARTAPP_CTRL0_RXTO_ENABLE (1 << 27)
+#define BP_UARTAPP_CTRL0_RXTIMEOUT (1 << 4)
+#define BM_UARTAPP_CTRL0_RXTIMEOUT 0x07FF0000
+#define BF_UARTAPP_CTRL0_RXTIMEOUT(v) \
+ (((v) << 16) & BM_UARTAPP_CTRL0_RXTIMEOUT)
+#define BP_UARTAPP_CTRL0_XFER_COUNT 0
+#define BM_UARTAPP_CTRL0_XFER_COUNT 0x0000FFFF
+#define BF_UARTAPP_CTRL0_XFER_COUNT(v) \
+ (((v) << BP_UARTAPP_CTRL0_XFER_COUNT) & \
+ BM_UARTAPP_CTRL0_XFER_COUNT)
+
+#define BP_UARTAPP_CTRL1_RSVD2 29
+#define BM_UARTAPP_CTRL1_RSVD2 0xE0000000
+#define BF_UARTAPP_CTRL1_RSVD2(v) \
+ (((v) << BP_UARTAPP_CTRL1_RSVD2) & \
+ BM_UARTAPP_CTRL1_RSVD2)
+
+#define BM_UARTAPP_CTRL1_RUN (1 << 28)
+#define BP_UARTAPP_CTRL1_RSVD1 16
+#define BM_UARTAPP_CTRL1_RSVD1 0x0FFF0000
+#define BF_UARTAPP_CTRL1_RSVD1(v) \
+ (((v) << BP_UARTAPP_CTRL1_RSVD1) & \
+ BM_UARTAPP_CTRL1_RSVD1)
+
+#define BP_UARTAPP_CTRL1_XFER_COUNT 0
+#define BM_UARTAPP_CTRL1_XFER_COUNT 0x0000FFFF
+#define BF_UARTAPP_CTRL1_XFER_COUNT(v) \
+ (((v) << BP_UARTAPP_CTRL1_XFER_COUNT) & \
+ BM_UARTAPP_CTRL1_XFER_COUNT)
+
+#define BM_UARTAPP_CTRL2_INVERT_RTS (1 << 31)
+#define BM_UARTAPP_CTRL2_INVERT_CTS (1 << 30)
+#define BM_UARTAPP_CTRL2_INVERT_TX (1 << 29)
+#define BM_UARTAPP_CTRL2_INVERT_RX (1 << 28)
+#define BM_UARTAPP_CTRL2_RTS_SEMAPHORE (1 << 27)
+#define BM_UARTAPP_CTRL2_DMAONERR (1 << 26)
+#define BM_UARTAPP_CTRL2_TXDMAE (1 << 25)
+#define BM_UARTAPP_CTRL2_RXDMAE (1 << 24)
+#define BM_UARTAPP_CTRL2_RSVD2 (1 << 23)
+#define BP_UARTAPP_CTRL2_RXIFLSEL 20
+#define BM_UARTAPP_CTRL2_RXIFLSEL 0x00700000
+#define BF_UARTAPP_CTRL2_RXIFLSEL(v) \
+ (((v) << BP_UARTAPP_CTRL2_RXIFLSEL) & \
+ BM_UARTAPP_CTRL2_RXIFLSEL)
+
+#define BV_UARTAPP_CTRL2_RXIFLSEL__NOT_EMPTY 0x0
+#define BV_UARTAPP_CTRL2_RXIFLSEL__ONE_QUARTER 0x1
+#define BV_UARTAPP_CTRL2_RXIFLSEL__ONE_HALF 0x2
+#define BV_UARTAPP_CTRL2_RXIFLSEL__THREE_QUARTERS 0x3
+#define BV_UARTAPP_CTRL2_RXIFLSEL__SEVEN_EIGHTHS 0x4
+#define BV_UARTAPP_CTRL2_RXIFLSEL__INVALID5 0x5
+#define BV_UARTAPP_CTRL2_RXIFLSEL__INVALID6 0x6
+#define BV_UARTAPP_CTRL2_RXIFLSEL__INVALID7 0x7
+#define BM_UARTAPP_CTRL2_RSVD3 (1 << 19)
+#define BP_UARTAPP_CTRL2_TXIFLSEL 16
+#define BM_UARTAPP_CTRL2_TXIFLSEL 0x00070000
+#define BF_UARTAPP_CTRL2_TXIFLSEL(v) \
+ (((v) << BP_UARTAPP_CTRL2_TXIFLSEL) & \
+ BM_UARTAPP_CTRL2_TXIFLSEL)
+#define BV_UARTAPP_CTRL2_TXIFLSEL__EMPTY 0x0
+#define BV_UARTAPP_CTRL2_TXIFLSEL__ONE_QUARTER 0x1
+#define BV_UARTAPP_CTRL2_TXIFLSEL__ONE_HALF 0x2
+#define BV_UARTAPP_CTRL2_TXIFLSEL__THREE_QUARTERS 0x3
+#define BV_UARTAPP_CTRL2_TXIFLSEL__SEVEN_EIGHTHS 0x4
+#define BV_UARTAPP_CTRL2_TXIFLSEL__INVALID5 0x5
+#define BV_UARTAPP_CTRL2_TXIFLSEL__INVALID6 0x6
+#define BV_UARTAPP_CTRL2_TXIFLSEL__INVALID7 0x7
+#define BM_UARTAPP_CTRL2_CTSEN (1 << 15)
+#define BM_UARTAPP_CTRL2_RTSEN (1 << 14)
+#define BM_UARTAPP_CTRL2_OUT2 (1 << 13)
+#define BM_UARTAPP_CTRL2_OUT1 (1 << 12)
+#define BM_UARTAPP_CTRL2_RTS (1 << 11)
+#define BM_UARTAPP_CTRL2_DTR (1 << 10)
+#define BM_UARTAPP_CTRL2_RXE (1 << 9)
+#define BM_UARTAPP_CTRL2_TXE (1 << 8)
+#define BM_UARTAPP_CTRL2_LBE (1 << 7)
+#define BM_UARTAPP_CTRL2_USE_LCR2 (1 << 6)
+#define BP_UARTAPP_CTRL2_RSVD4 3
+#define BM_UARTAPP_CTRL2_RSVD4 0x00000038
+#define BF_UARTAPP_CTRL2_RSVD4(v) \
+ (((v) << BP_UARTAPP_CTRL2_RSVD4) & \
+ BM_UARTAPP_CTRL2_RSVD4)
+
+#define BM_UARTAPP_CTRL2_SIRLP (1 << 2)
+#define BM_UARTAPP_CTRL2_SIREN (1 << 1)
+#define BM_UARTAPP_CTRL2_UARTEN (1 << 0)
+
+#define BP_UARTAPP_LINECTRL_BAUD_DIVINT 16
+#define BM_UARTAPP_LINECTRL_BAUD_DIVINT 0xFFFF0000
+#define BF_UARTAPP_LINECTRL_BAUD_DIVINT(v) \
+ (((v) << BP_UARTAPP_LINECTRL_BAUD_DIVINT) & \
+ BM_UARTAPP_LINECTRL_BAUD_DIVINT)
+
+#define BP_UARTAPP_LINECTRL_RSVD 14
+#define BM_UARTAPP_LINECTRL_RSVD 0x0000C000
+#define BF_UARTAPP_LINECTRL_RSVD(v) \
+ (((v) << BP_UARTAPP_LINECTRL_RSVD) & \
+ BM_UARTAPP_LINECTRL_RSVD)
+
+#define BP_UARTAPP_LINECTRL_BAUD_DIVFRAC 8
+#define BM_UARTAPP_LINECTRL_BAUD_DIVFRAC 0x00003F00
+#define BF_UARTAPP_LINECTRL_BAUD_DIVFRAC(v) \
+ (((v) << BP_UARTAPP_LINECTRL_BAUD_DIVFRAC) & \
+ BM_UARTAPP_LINECTRL_BAUD_DIVFRAC)
+
+#define BM_UARTAPP_LINECTRL_SPS (1 << 7)
+#define BP_UARTAPP_LINECTRL_WLEN 5
+#define BM_UARTAPP_LINECTRL_WLEN 0x00000060
+#define BF_UARTAPP_LINECTRL_WLEN(v) \
+ (((v) << BP_UARTAPP_LINECTRL_WLEN) & \
+ BM_UARTAPP_LINECTRL_WLEN)
+
+#define BM_UARTAPP_LINECTRL_FEN (1 << 4)
+#define BM_UARTAPP_LINECTRL_STP2 (1 << 3)
+#define BM_UARTAPP_LINECTRL_EPS (1 << 2)
+#define BM_UARTAPP_LINECTRL_PEN (1 << 1)
+#define BM_UARTAPP_LINECTRL_BRK (1 << 0)
+
+#define BP_UARTAPP_LINECTRL2_BAUD_DIVINT 16
+#define BM_UARTAPP_LINECTRL2_BAUD_DIVINT 0xFFFF0000
+#define BF_UARTAPP_LINECTRL2_BAUD_DIVINT(v) \
+ (((v) << BP_UARTAPP_LINECTRL2_BAUD_DIVINT) & \
+ BM_UARTAPP_LINECTRL2_BAUD_DIVINT)
+
+#define BP_UARTAPP_LINECTRL2_RSVD 14
+#define BM_UARTAPP_LINECTRL2_RSVD 0x0000C000
+#define BF_UARTAPP_LINECTRL2_RSVD(v) \
+ (((v) << BP_UARTAPP_LINECTRL2_RSVD) & \
+ BM_UARTAPP_LINECTRL2_RSVD)
+
+#define BP_UARTAPP_LINECTRL2_BAUD_DIVFRAC 8
+#define BM_UARTAPP_LINECTRL2_BAUD_DIVFRAC 0x00003F00
+#define BF_UARTAPP_LINECTRL2_BAUD_DIVFRAC(v) \
+ (((v) << BP_UARTAPP_LINECTRL2_BAUD_DIVFRAC) & \
+ BM_UARTAPP_LINECTRL2_BAUD_DIVFRAC)
+
+#define BM_UARTAPP_LINECTRL2_SPS (1 << 7)
+#define BP_UARTAPP_LINECTRL2_WLEN 5
+#define BM_UARTAPP_LINECTRL2_WLEN 0x00000060
+#define BF_UARTAPP_LINECTRL2_WLEN(v) \
+ (((v) << BP_UARTAPP_LINECTRL2_WLEN) & \
+ BM_UARTAPP_LINECTRL2_WLEN)
+
+#define BM_UARTAPP_LINECTRL2_FEN (1 << 4)
+#define BM_UARTAPP_LINECTRL2_STP2 (1 << 3)
+#define BM_UARTAPP_LINECTRL2_EPS (1 << 2)
+#define BM_UARTAPP_LINECTRL2_PEN (1 << 1)
+#define BM_UARTAPP_LINECTRL2_RSVD1 (1 << 0)
+
+#define BP_UARTAPP_INTR_RSVD1 28
+#define BM_UARTAPP_INTR_RSVD1 0xF0000000
+#define BF_UARTAPP_INTR_RSVD1(v) \
+ (((v) << BP_UARTAPP_INTR_RSVD1) & \
+ BM_UARTAPP_INTR_RSVD1)
+
+#define BM_UARTAPP_INTR_ABDIEN (1 << 27)
+#define BM_UARTAPP_INTR_OEIEN (1 << 26)
+#define BM_UARTAPP_INTR_BEIEN (1 << 25)
+#define BM_UARTAPP_INTR_PEIEN (1 << 24)
+#define BM_UARTAPP_INTR_FEIEN (1 << 23)
+#define BM_UARTAPP_INTR_RTIEN (1 << 22)
+#define BM_UARTAPP_INTR_TXIEN (1 << 21)
+#define BM_UARTAPP_INTR_RXIEN (1 << 20)
+#define BM_UARTAPP_INTR_DSRMIEN (1 << 19)
+#define BM_UARTAPP_INTR_DCDMIEN (1 << 18)
+#define BM_UARTAPP_INTR_CTSMIEN (1 << 17)
+#define BM_UARTAPP_INTR_RIMIEN (1 << 16)
+#define BP_UARTAPP_INTR_RSVD2 12
+#define BM_UARTAPP_INTR_RSVD2 0x0000F000
+#define BF_UARTAPP_INTR_RSVD2(v) \
+ (((v) << BP_UARTAPP_INTR_RSVD2) & \
+ BM_UARTAPP_INTR_RSVD2)
+
+#define BM_UARTAPP_INTR_ABDIS (1 << 11)
+#define BM_UARTAPP_INTR_OEIS (1 << 10)
+#define BM_UARTAPP_INTR_BEIS (1 << 9)
+#define BM_UARTAPP_INTR_PEIS (1 << 8)
+#define BM_UARTAPP_INTR_FEIS (1 << 7)
+#define BM_UARTAPP_INTR_RTIS (1 << 6)
+#define BM_UARTAPP_INTR_TXIS (1 << 5)
+#define BM_UARTAPP_INTR_RXIS (1 << 4)
+#define BM_UARTAPP_INTR_DSRMIS (1 << 3)
+#define BM_UARTAPP_INTR_DCDMIS (1 << 2)
+#define BM_UARTAPP_INTR_CTSMIS (1 << 1)
+#define BM_UARTAPP_INTR_RIMIS (1 << 0)
+
+#define BP_UARTAPP_DATA_DATA 0
+#define BM_UARTAPP_DATA_DATA 0xFFFFFFFF
+#define BF_UARTAPP_DATA_DATA(v) (v)
+
+#define BM_UARTAPP_STAT_PRESENT (1 << 31)
+#define BV_UARTAPP_STAT_PRESENT__UNAVAILABLE 0x0
+#define BV_UARTAPP_STAT_PRESENT__AVAILABLE 0x1
+
+#define BM_UARTAPP_STAT_HISPEED (1 << 30)
+#define BV_UARTAPP_STAT_HISPEED__UNAVAILABLE 0x0
+#define BV_UARTAPP_STAT_HISPEED__AVAILABLE 0x1
+
+#define BM_UARTAPP_STAT_BUSY (1 << 29)
+#define BM_UARTAPP_STAT_CTS (1 << 28)
+#define BM_UARTAPP_STAT_TXFE (1 << 27)
+#define BM_UARTAPP_STAT_RXFF (1 << 26)
+#define BM_UARTAPP_STAT_TXFF (1 << 25)
+#define BM_UARTAPP_STAT_RXFE (1 << 24)
+#define BP_UARTAPP_STAT_RXBYTE_INVALID 20
+#define BM_UARTAPP_STAT_RXBYTE_INVALID 0x00F00000
+#define BF_UARTAPP_STAT_RXBYTE_INVALID(v) \
+ (((v) << BP_UARTAPP_STAT_RXBYTE_INVALID) & \
+ BM_UARTAPP_STAT_RXBYTE_INVALID)
+
+#define BM_UARTAPP_STAT_OERR (1 << 19)
+#define BM_UARTAPP_STAT_BERR (1 << 18)
+#define BM_UARTAPP_STAT_PERR (1 << 17)
+#define BM_UARTAPP_STAT_FERR (1 << 16)
+#define BP_UARTAPP_STAT_RXCOUNT 0
+#define BM_UARTAPP_STAT_RXCOUNT 0x0000FFFF
+#define BF_UARTAPP_STAT_RXCOUNT(v) \
+ (((v) << BP_UARTAPP_STAT_RXCOUNT) & \
+ BM_UARTAPP_STAT_RXCOUNT)
+
+#define BP_UARTAPP_DEBUG_RXIBAUD_DIV 16
+#define BM_UARTAPP_DEBUG_RXIBAUD_DIV 0xFFFF0000
+#define BF_UARTAPP_DEBUG_RXIBAUD_DIV(v) \
+ (((v) << BP_UARTAPP_DEBUG_RXIBAUD_DIV) & \
+ BM_UARTAPP_DEBUG_RXIBAUD_DIV)
+
+#define BP_UARTAPP_DEBUG_RXFBAUD_DIV 10
+#define BM_UARTAPP_DEBUG_RXFBAUD_DIV 0x0000FC00
+#define BF_UARTAPP_DEBUG_RXFBAUD_DIV(v) \
+ (((v) << BP_UARTAPP_DEBUG_RXFBAUD_DIV) & \
+ BM_UARTAPP_DEBUG_RXFBAUD_DIV)
+
+#define BP_UARTAPP_DEBUG_RSVD1 6
+#define BM_UARTAPP_DEBUG_RSVD1 0x000003C0
+#define BF_UARTAPP_DEBUG_RSVD1(v) \
+ (((v) << BP_UARTAPP_DEBUG_RSVD1) & \
+ BM_UARTAPP_DEBUG_RSVD1)
+
+#define BM_UARTAPP_DEBUG_TXDMARUN (1 << 5)
+#define BM_UARTAPP_DEBUG_RXDMARUN (1 << 4)
+#define BM_UARTAPP_DEBUG_TXCMDEND (1 << 3)
+#define BM_UARTAPP_DEBUG_RXCMDEND (1 << 2)
+#define BM_UARTAPP_DEBUG_TXDMARQ (1 << 1)
+#define BM_UARTAPP_DEBUG_RXDMARQ (1 << 0)
+
+#define BP_UARTAPP_VERSION_MAJOR 24
+#define BM_UARTAPP_VERSION_MAJOR 0xFF000000
+#define BF_UARTAPP_VERSION_MAJOR(v) \
+ (((v) << BP_UARTAPP_VERSION_MAJOR) & \
+ BM_UARTAPP_VERSION_MAJOR)
+
+#define BP_UARTAPP_VERSION_MINOR 16
+#define BM_UARTAPP_VERSION_MINOR 0x00FF0000
+#define BF_UARTAPP_VERSION_MINOR(v) \
+ (((v) << BP_UARTAPP_VERSION_MINOR) & \
+ BM_UARTAPP_VERSION_MINOR)
+
+#define BP_UARTAPP_VERSION_STEP 0
+#define BM_UARTAPP_VERSION_STEP 0x0000FFFF
+#define BF_UARTAPP_VERSION_STEP(v) \
+ (((v) << BP_UARTAPP_VERSION_STEP) & \
+ BM_UARTAPP_VERSION_STEP)
+
+#define BP_UARTAPP_AUTOBAUD_REFCHAR1 24
+#define BM_UARTAPP_AUTOBAUD_REFCHAR1 0xFF000000
+#define BF_UARTAPP_AUTOBAUD_REFCHAR1(v) \
+ (((v) << BP_UARTAPP_AUTOBAUD_REFCHAR1) & \
+ BM_UARTAPP_AUTOBAUD_REFCHAR1)
+
+#define BP_UARTAPP_AUTOBAUD_REFCHAR0 16
+#define BM_UARTAPP_AUTOBAUD_REFCHAR0 0x00FF0000
+#define BF_UARTAPP_AUTOBAUD_REFCHAR0(v) \
+ (((v) << BP_UARTAPP_AUTOBAUD_REFCHAR0) & \
+ BM_UARTAPP_AUTOBAUD_REFCHAR0)
+
+#define BP_UARTAPP_AUTOBAUD_RSVD1 5
+#define BM_UARTAPP_AUTOBAUD_RSVD1 0x0000FFE0
+#define BF_UARTAPP_AUTOBAUD_RSVD1(v) \
+ (((v) << BP_UARTAPP_AUTOBAUD_RSVD1) & \
+ BM_UARTAPP_AUTOBAUD_RSVD1)
+
+#define BM_UARTAPP_AUTOBAUD_UPDATE_TX (1 << 4)
+#define BM_UARTAPP_AUTOBAUD_TWO_REF_CHARS (1 << 3)
+#define BM_UARTAPP_AUTOBAUD_START_WITH_RUNBIT (1 << 2)
+#define BM_UARTAPP_AUTOBAUD_START_BAUD_DETECT (1 << 1)
+#define BM_UARTAPP_AUTOBAUD_BAUD_DETECT_ENABLE (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..a99dccf
--- /dev/null
+++ b/drivers/serial/mxs_auart.c
@@ -0,0 +1,118 @@
+/*
+ * Driver to use an application UART as console output for Freescale
+ * MXS devices.
+ *
+ * Copyright (C) 2013 Andreas Wass <andreas.wass at dalelven.com>
+ *
+ * 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
+
+#ifndef CONFIG_MXS_AUART_CLK
+/* At least the i.MX28 always uses a 24MHz clock for AUART */
+#define CONFIG_MXS_AUART_CLK 24000000
+#endif
+
+static struct mxs_uartapp_regs *get_uartapp_registers(void)
+{
+ return (struct mxs_uartapp_regs*)CONFIG_MXS_AUART_BASE;
+}
+
+/*
+ * Set baud rate. The settings are always 8n1
+ */
+void mxs_auart_setbrg(void)
+{
+ u32 div;
+ u32 linectrl = 0;
+ struct mxs_uartapp_regs *regs = get_uartapp_registers();
+
+ div = (CONFIG_MXS_AUART_CLK * 32) / CONFIG_BAUDRATE;
+ linectrl |= BF_UARTAPP_LINECTRL_BAUD_DIVFRAC(div & 0x3F);
+ linectrl |= BF_UARTAPP_LINECTRL_BAUD_DIVINT(div >> 6);
+ linectrl |= BF_UARTAPP_LINECTRL_WLEN(3);
+ linectrl |= BM_UARTAPP_LINECTRL_FEN;
+
+ writel(linectrl, ®s->hw_uartapp_linectrl);
+}
+
+int mxs_auart_init(void)
+{
+ struct mxs_uartapp_regs *regs = get_uartapp_registers();
+ mxs_reset_block(®s->hw_uartapp_ctrl0_reg);
+ writel(0, ®s->hw_uartapp_intr);
+ serial_setbrg();
+
+ writel(BM_UARTAPP_CTRL2_RTSEN |
+ BM_UARTAPP_CTRL2_CTSEN |
+ BM_UARTAPP_CTRL2_USE_LCR2,
+ ®s->hw_uartapp_ctrl2_clr);
+
+ writel(BM_UARTAPP_CTRL2_RXE |
+ BM_UARTAPP_CTRL2_TXE |
+ BM_UARTAPP_CTRL2_UARTEN,
+ ®s->hw_uartapp_ctrl2_set);
+ return 0;
+}
+
+void mxs_auart_putc(const char c)
+{
+ struct mxs_uartapp_regs *regs = get_uartapp_registers();
+ while (readl(®s->hw_uartapp_stat) & BM_UARTAPP_STAT_TXFF)
+ ;
+
+ writel(c, ®s->hw_uartapp_data);
+
+ if (c == '\n')
+ mxs_auart_putc('\r');
+}
+
+int mxs_auart_tstc(void)
+{
+ struct mxs_uartapp_regs *regs = get_uartapp_registers();
+
+ return !(readl(®s->hw_uartapp_stat) & BM_UARTAPP_STAT_RXFE);
+}
+
+int mxs_auart_getc(void)
+{
+ struct mxs_uartapp_regs *regs = get_uartapp_registers();
+
+ while (!mxs_auart_tstc())
+ ;
+
+ return readl(®s->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..2bc42a7 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
@@ -251,7 +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
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