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  • /*
     * SuperH SCIF device driver.
    
     * Copyright (C) 2007,2008,2010 Nobuhiro Iwamatsu
     * Copyright (C) 2002 - 2008  Paul Mundt
    
     * 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/processor.h>
    
    #include "serial_sh.h"
    
    #if defined(CONFIG_CONS_SCIF0)
    # define SCIF_BASE	SCIF0_BASE
    #elif defined(CONFIG_CONS_SCIF1)
    # define SCIF_BASE	SCIF1_BASE
    #elif defined(CONFIG_CONS_SCIF2)
    # define SCIF_BASE	SCIF2_BASE
    #elif defined(CONFIG_CONS_SCIF3)
    # define SCIF_BASE	SCIF3_BASE
    #elif defined(CONFIG_CONS_SCIF4)
    # define SCIF_BASE	SCIF4_BASE
    #elif defined(CONFIG_CONS_SCIF5)
    # define SCIF_BASE	SCIF5_BASE
    
    # error "Default SCIF doesn't set....."
    
    #if defined(CONFIG_SCIF_A)
    	#define SCIF_BASE_PORT	PORT_SCIFA
    
    	#define SCIF_BASE_PORT	PORT_SCIF
    
    static struct uart_port sh_sci = {
    	.membase	= (unsigned char*)SCIF_BASE,
    	.mapbase	= SCIF_BASE,
    	.type		= SCIF_BASE_PORT,
    };
    
    void serial_setbrg(void)
    
    	DECLARE_GLOBAL_DATA_PTR;
    	sci_out(&sh_sci, SCBRR, SCBRR_VALUE(gd->baudrate, CONFIG_SYS_CLK_FREQ));
    
    int serial_init(void)
    
    	sci_out(&sh_sci, SCSCR , SCSCR_INIT(&sh_sci));
    	sci_out(&sh_sci, SCSCR , SCSCR_INIT(&sh_sci));
    	sci_out(&sh_sci, SCSMR, 0);
    	sci_out(&sh_sci, SCSMR, 0);
    	sci_out(&sh_sci, SCFCR, SCFCR_RFRST|SCFCR_TFRST);
    	sci_in(&sh_sci, SCFCR);
    	sci_out(&sh_sci, SCFCR, 0);
    
    
    	serial_setbrg();
    	return 0;
    }
    
    
    #if defined(CONFIG_CPU_SH7760) || \
    	defined(CONFIG_CPU_SH7780) || \
    	defined(CONFIG_CPU_SH7785) || \
    	defined(CONFIG_CPU_SH7786)
    static int scif_rxfill(struct uart_port *port)
    {
    	return sci_in(port, SCRFDR) & 0xff;
    }
    #elif defined(CONFIG_CPU_SH7763)
    static int scif_rxfill(struct uart_port *port)
    
    	if ((port->mapbase == 0xffe00000) ||
    		(port->mapbase == 0xffe08000)) {
    		/* SCIF0/1*/
    		return sci_in(port, SCRFDR) & 0xff;
    	} else {
    		/* SCIF2 */
    		return sci_in(port, SCFDR) & SCIF2_RFDC_MASK;
    	}
    }
    #elif defined(CONFIG_ARCH_SH7372)
    static int scif_rxfill(struct uart_port *port)
    {
    	if (port->type == PORT_SCIFA)
    		return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
    	else
    		return sci_in(port, SCRFDR);
    }
    
    static int scif_rxfill(struct uart_port *port)
    {
    	return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
    }
    
    
    static int serial_rx_fifo_level(void)
    {
    	return scif_rxfill(&sh_sci);
    
    void serial_raw_putc(const char c)
    
    		/* Tx fifo is empty */
    		if (sci_in(&sh_sci, SCxSR) & SCxSR_TEND(&sh_sci))
    
    	sci_out(&sh_sci, SCxTDR, c);
    	sci_out(&sh_sci, SCxSR, sci_in(&sh_sci, SCxSR) & ~SCxSR_TEND(&sh_sci));
    
    void serial_putc(const char c)
    
    {
    	if (c == '\n')
    
    		serial_raw_putc('\r');
    	serial_raw_putc(c);
    
    void serial_puts(const char *s)
    
    {
    	char c;
    	while ((c = *s++) != 0)
    
    		serial_putc(c);
    
    int serial_tstc(void)
    
    	return serial_rx_fifo_level() ? 1 : 0;
    
    void handle_error(void)
    {
    
    	sci_in(&sh_sci, SCxSR);
    	sci_out(&sh_sci, SCxSR, SCxSR_ERROR_CLEAR(&sh_sci));
    	sci_in(&sh_sci, SCLSR);
    	sci_out(&sh_sci, SCLSR, 0x00);
    
    int serial_getc_check(void)
    {
    
    	unsigned short status;
    
    
    	status = sci_in(&sh_sci, SCxSR);
    
    	if (status & SCIF_ERRORS)
    
    		handle_error();
    
    	if (sci_in(&sh_sci, SCLSR) & SCxSR_ORER(&sh_sci))
    
    		handle_error();
    
    	return status & (SCIF_DR | SCxSR_RDxF(&sh_sci));
    
    int serial_getc(void)
    
    	unsigned short status;
    
    
    	while (!serial_getc_check())
    		;
    
    	ch = sci_in(&sh_sci, SCxRDR);
    	status = sci_in(&sh_sci, SCxSR);
    
    	sci_out(&sh_sci, SCxSR, SCxSR_RDxF_CLEAR(&sh_sci));
    
    	if (status & SCIF_ERRORS)
    			handle_error();
    
    	if (sci_in(&sh_sci, SCLSR) & SCxSR_ORER(&sh_sci))
    
    		handle_error();
    
    	return ch;