Signed-off-by: Brian Cavagnolo brian@cozybit.com Signed-off-by: Andrey Yurovsky yurovsky@gmail.com --- drivers/serial/Makefile | 1 + drivers/serial/serial_pollux.c | 116 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 117 insertions(+), 0 deletions(-) create mode 100644 drivers/serial/serial_pollux.c
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile index c731bfb..87efd15 100644 --- a/drivers/serial/Makefile +++ b/drivers/serial/Makefile @@ -56,6 +56,7 @@ COBJS-$(CONFIG_S3C44B0_SERIAL) += serial_s3c44b0.o COBJS-$(CONFIG_XILINX_UARTLITE) += serial_xuartlite.o COBJS-$(CONFIG_SCIF_CONSOLE) += serial_sh.o COBJS-$(CONFIG_USB_TTY) += usbtty.o +COBJS-$(CONFIG_POLLUX_SERIAL) += serial_pollux.o
COBJS := $(sort $(COBJS-y)) SRCS := $(COBJS:.o=.c) diff --git a/drivers/serial/serial_pollux.c b/drivers/serial/serial_pollux.c new file mode 100644 index 0000000..62229dd --- /dev/null +++ b/drivers/serial/serial_pollux.c @@ -0,0 +1,116 @@ +/* (C) Copyright 2010 cozybit, Inc. + * Brian Cavagnolo brian@cozybit.com + * + * (C) Copyright 2007 Leapfrog, Inc. + * Andrey Yurovsky" yurovsky@gmail.com + * + * 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 + */ + +#include <common.h> +#include <asm/arch/reg.h> +#include <asm/arch/uart.h> + +#ifndef CONFIG_CONSOLE_UART_BASE +#error "Please define CONFIG_CONSOLE_UART_BASE to a suitable UARTx_BASE" +#endif +#define UART_BASE CONFIG_CONSOLE_UART_BASE + +DECLARE_GLOBAL_DATA_PTR; + +#define DEFAULT_BRD 1 +void serial_setbrg (void) +{ + int baudrate, brd; + + if ((baudrate = gd->baudrate) <= 0) + baudrate = CONFIG_BAUDRATE; + + /* we expect that the board-specific code set up the clock source such + * that a BRD of 1 corresponds to a baudrate of 115200 bps. We use + * this fact to calculate the BRD for any baudrate. We add one bit of + * precision to the division so we can round to the best BRD. + */ + brd = ((((115200 << 1)*(DEFAULT_BRD + 1)/baudrate) + 1) >> 1) - 1; + REG16(UART_BASE + BRD) = brd; +} + +int serial_init (void) +{ + /* expect that board-specific init has setup clock source */ + + /* disable UART clock */ + REG32(UART_BASE + UARTCLKENB) &= ~(1<<UARTCLKGENENB); + + /* clear IRQ pending, set 8 bit word length */ + REG16(UART_BASE + LCON) = (1<<SYNC_PENDCLR)|(3<<WORD_LEN); + + /* enable polling/IRQ transmit and receive */ + REG16(UART_BASE + UCON) = (1<<TRANS_MODE)|(1<<RECEIVE_MODE); + + /* reset the FIFOs */ + REG16(UART_BASE + FCON) = + (1<<TX_FIFO_RESET)|(1<<RX_FIFO_RESET); + + /* enable TX */ + REG16(UART_BASE + MCON) = (1<<SCRXENB); + + /* set the baud rate */ + serial_setbrg(); + + /* enable UART clock */ + REG32(UART_BASE + UARTCLKENB) |= (1<<UARTCLKGENENB); + + return 0; +} + +void serial_putc (const char c) +{ + u16 status, ready_mask; + + ready_mask = (1<<TRANSMITTER_EMPTY)|(1<<TRANSMIT_BUFFER_EMPTY); + if(c == '\n') + serial_putc('\r'); + + while(1) { /* wait for transmitter to be ready */ + status = REG16(UART_BASE + TRSTATUS); + if(status & ready_mask) + break; + } + /* transmit */ + REG8(UART_BASE + THB) = c; +} + +void serial_puts (const char *s) +{ + while (*s) { + serial_putc (*s++); + } +} + +int serial_tstc (void) +{ + return (REG16(UART_BASE + FSTATUS) & 0xF); +} + +int serial_getc (void) +{ + while(!serial_tstc()); + return REG16(UART_BASE + RHB); +}