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| -rw-r--r-- | examples/Makefile | 66 | ||||
| -rw-r--r-- | include/ns16550.h | 112 |
2 files changed, 178 insertions, 0 deletions
diff --git a/examples/Makefile b/examples/Makefile new file mode 100644 index 0000000..b7d6f94 --- /dev/null +++ b/examples/Makefile @@ -0,0 +1,66 @@ +# +# (C) Copyright 2000 +# Wolfgang Denk, DENX Software Engineering, wd@denx.de. +# +# See file CREDITS for list of people who contributed to this +# project. +# +# 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., 59 Temple Place, Suite 330, Boston, +# MA 02111-1307 USA +# + +LOAD_ADDR = 0x40000 + +include $(TOPDIR)/config.mk + +SREC = hello_world.srec + +# The following example is pretty 8xx specific... +ifeq ($(CPU),mpc8xx) +SREC += timer.srec +endif + +# Utility for resetting i82559 EEPROM +ifeq ($(BOARD),oxc) +SREC += eepro100_eeprom.srec +endif + +OBJS = $(SREC:.srec=.o) + +LIB = libsyscall.a +LIBAOBJS= syscall.o +LIBCOBJS= +LIBOBJS = $(LIBAOBJS) $(LIBCOBJS) + +CPPFLAGS += -I.. + +all: .depend $(LIB) $(SREC) + +######################################################################### +$(LIB): .depend $(LIBOBJS) + $(AR) crv $@ $(LIBOBJS) + +%.srec: %.o $(LIB) + $(LD) -g -Ttext $(LOAD_ADDR) -o $(<:.o=) -e $(<:.o=) $< $(LIB) + $(OBJCOPY) -O srec $(<:.o=) $@ + +######################################################################### + +.depend: Makefile $(OBJS:.o=.c) $(LIBCOBJS:.o=.c) $(LIBAOBJS:.o=.S) + $(CC) -M $(CFLAGS) $(OBJS:.o=.c) $(LIBCOBJS:.o=.c) $(LIBAOBJS:.o=.S) > $@ + +sinclude .depend + +######################################################################### diff --git a/include/ns16550.h b/include/ns16550.h new file mode 100644 index 0000000..b2e791a --- /dev/null +++ b/include/ns16550.h @@ -0,0 +1,112 @@ +/* + * NS16550 Serial Port + * originally from linux source (arch/ppc/boot/ns16550.h) + * modified slightly to + * have addresses as offsets from CFG_ISA_BASE + * added a few more definitions + * added prototypes for ns16550.c + * reduced no of com ports to 2 + * modifications (c) Rob Taylor, Flying Pig Systems. 2000. + */ + +#if (CFG_NS16550_REG_SIZE == 1) +struct NS16550 { + unsigned char rbr; /* 0 */ + unsigned char ier; /* 1 */ + unsigned char fcr; /* 2 */ + unsigned char lcr; /* 3 */ + unsigned char mcr; /* 4 */ + unsigned char lsr; /* 5 */ + unsigned char msr; /* 6 */ + unsigned char scr; /* 7 */ +} __attribute__ ((packed)); +#elif (CFG_NS16550_REG_SIZE == 2) +struct NS16550 { + unsigned short rbr; /* 0 */ + unsigned short ier; /* 1 */ + unsigned short fcr; /* 2 */ + unsigned short lcr; /* 3 */ + unsigned short mcr; /* 4 */ + unsigned short lsr; /* 5 */ + unsigned short msr; /* 6 */ + unsigned short scr; /* 7 */ +} __attribute__ ((packed)); +#elif (CFG_NS16550_REG_SIZE == 4) +struct NS16550 { + unsigned long rbr; /* 0 */ + unsigned long ier; /* 1 */ + unsigned long fcr; /* 2 */ + unsigned long lcr; /* 3 */ + unsigned long mcr; /* 4 */ + unsigned long lsr; /* 5 */ + unsigned long msr; /* 6 */ + unsigned long scr; /* 7 */ +} __attribute__ ((packed)); +#elif (CFG_NS16550_REG_SIZE == -4) +struct NS16550 { + unsigned char rbr; /* 0 */ + int pad1:24; + unsigned char ier; /* 1 */ + int pad2:24; + unsigned char fcr; /* 2 */ + int pad3:24; + unsigned char lcr; /* 3 */ + int pad4:24; + unsigned char mcr; /* 4 */ + int pad5:24; + unsigned char lsr; /* 5 */ + int pad6:24; + unsigned char msr; /* 6 */ + int pad7:24; + unsigned char scr; /* 7 */ + int pad8:24; +} __attribute__ ((packed)); +#else +#error "Please define NS16550 registers size." +#endif + +#define thr rbr +#define iir fcr +#define dll rbr +#define dlm ier + +typedef volatile struct NS16550 *NS16550_t; + +#define FCR_FIFO_EN 0x01 /* Fifo enable */ +#define FCR_RXSR 0x02 /* Receiver soft reset */ +#define FCR_TXSR 0x04 /* Transmitter soft reset */ + +#define MCR_DTR 0x01 +#define MCR_RTS 0x02 +#define MCR_DMA_EN 0x04 +#define MCR_TX_DFR 0x08 + +#define LCR_WLS_MSK 0x03 /* character length slect mask */ +#define LCR_WLS_5 0x00 /* 5 bit character length */ +#define LCR_WLS_6 0x01 /* 6 bit character length */ +#define LCR_WLS_7 0x02 /* 7 bit character length */ +#define LCR_WLS_8 0x03 /* 8 bit character length */ +#define LCR_STB 0x04 /* Number of stop Bits, off = 1, on = 1.5 or 2) */ +#define LCR_PEN 0x08 /* Parity eneble */ +#define LCR_EPS 0x10 /* Even Parity Select */ +#define LCR_STKP 0x20 /* Stick Parity */ +#define LCR_SBRK 0x40 /* Set Break */ +#define LCR_BKSE 0x80 /* Bank select enable */ + +#define LSR_DR 0x01 /* Data ready */ +#define LSR_OE 0x02 /* Overrun */ +#define LSR_PE 0x04 /* Parity error */ +#define LSR_FE 0x08 /* Framing error */ +#define LSR_BI 0x10 /* Break */ +#define LSR_THRE 0x20 /* Xmit holding register empty */ +#define LSR_TEMT 0x40 /* Xmitter empty */ +#define LSR_ERR 0x80 /* Error */ + +/* useful defaults for LCR */ +#define LCR_8N1 0x03 + +void NS16550_init (NS16550_t com_port, int baud_divisor); +void NS16550_putc (NS16550_t com_port, char c); +char NS16550_getc (NS16550_t com_port); +int NS16550_tstc (NS16550_t com_port); +void NS16550_reinit (NS16550_t com_port, int baud_divisor); |