diff options
Diffstat (limited to 'u-boot/drivers/serial/serial_sh.c')
| -rw-r--r-- | u-boot/drivers/serial/serial_sh.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/u-boot/drivers/serial/serial_sh.c b/u-boot/drivers/serial/serial_sh.c new file mode 100644 index 0000000..fcf69ab --- /dev/null +++ b/u-boot/drivers/serial/serial_sh.c @@ -0,0 +1,185 @@ +/* + * 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/io.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 +#else +# error "Default SCIF doesn't set....." +#endif + +#if defined(CONFIG_SCIF_A) + #define SCIF_BASE_PORT PORT_SCIFA +#else + #define SCIF_BASE_PORT PORT_SCIF +#endif + +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); +} +#else +static int scif_rxfill(struct uart_port *port) +{ + return sci_in(port, SCFDR) & SCIF_RFDC_MASK; +} +#endif + +static int serial_rx_fifo_level(void) +{ + return scif_rxfill(&sh_sci); +} + +void serial_raw_putc(const char c) +{ + while (1) { + /* Tx fifo is empty */ + if (sci_in(&sh_sci, SCxSR) & SCxSR_TEND(&sh_sci)) + break; + } + + 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; + char ch; + + 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; +} |