diff options
Diffstat (limited to 'drivers/serial_sh.c')
| -rw-r--r-- | drivers/serial_sh.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/drivers/serial_sh.c b/drivers/serial_sh.c new file mode 100644 index 0000000..fca92fd --- /dev/null +++ b/drivers/serial_sh.c @@ -0,0 +1,177 @@ +/* + * SuperH SCIF device driver. + * Copyright (c) 2007 Nobuhiro Iwamatsu + * + * 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> + +#ifdef CFG_SCIF_CONSOLE + +#if defined (CONFIG_CONS_SCIF0) +#define SCIF_BASE SCIF0_BASE +#elif defined (CONFIG_CONS_SCIF1) +#define SCIF_BASE SCIF1_BASE +#else +#error "Default SCIF doesn't set....." +#endif + +#define SCSMR (volatile unsigned short *)(SCIF_BASE + 0x0) +#define SCBRR (volatile unsigned char *)(SCIF_BASE + 0x4) +#define SCSCR (volatile unsigned short *)(SCIF_BASE + 0x8) +#define SCFTDR (volatile unsigned char *)(SCIF_BASE + 0xC) +#define SCFSR (volatile unsigned short *)(SCIF_BASE + 0x10) +#define SCFRDR (volatile unsigned char *)(SCIF_BASE + 0x14) +#define SCFCR (volatile unsigned short *)(SCIF_BASE + 0x18) +#define SCFDR (volatile unsigned short *)(SCIF_BASE + 0x1C) +#if defined(CONFIG_SH4A) +#define SCRFDR (volatile unsigned short *)(SCIF_BASE + 0x20) +#define SCSPTR (volatile unsigned short *)(SCIF_BASE + 0x24) +#define SCLSR (volatile unsigned short *)(SCIF_BASE + 0x28) +#define SCRER (volatile unsigned short *)(SCIF_BASE + 0x2C) +#elif defined (CONFIG_SH4) +#define SCSPTR (volatile unsigned short *)(SCIF_BASE + 0x20) +#define SCLSR (volatile unsigned short *)(SCIF_BASE + 0x24) +#elif defined (CONFIG_SH3) +#define SCLSR (volatile unsigned short *)(SCIF_BASE + 0x24) +#endif + +#define SCR_RE (1 << 4) +#define SCR_TE (1 << 5) +#define FCR_RFRST (1 << 1) /* RFCL */ +#define FCR_TFRST (1 << 2) /* TFCL */ +#define FSR_DR (1 << 0) +#define FSR_RDF (1 << 1) +#define FSR_FER (1 << 3) +#define FSR_BRK (1 << 4) +#define FSR_FER (1 << 3) +#define FSR_TEND (1 << 6) +#define FSR_ER (1 << 7) + +/*----------------------------------------------------------------------*/ + +void serial_setbrg (void) +{ + DECLARE_GLOBAL_DATA_PTR; + int divisor = gd->baudrate * 32; + + *SCBRR = (CONFIG_SYS_CLK_FREQ + (divisor / 2)) / + (gd->baudrate * 32) - 1; +} + +int serial_init (void) +{ + *SCSCR = (SCR_RE | SCR_TE); + *SCSMR = 0 ; + *SCSMR = 0; + *SCFCR = (FCR_RFRST | FCR_TFRST); + *SCFCR; + *SCFCR = 0; + + serial_setbrg(); + return 0; +} + +static int serial_tx_fifo_level (void) +{ + return (*SCFDR >> 8) & 0x1F; +} + +static int serial_rx_fifo_level (void) +{ + return (*SCFDR >> 0) & 0x1F; +} + +void serial_raw_putc (const char c) +{ + unsigned int fsr_bits_to_clear; + + while (1) { + if (*SCFSR & FSR_TEND) { /* Tx fifo is empty */ + fsr_bits_to_clear = FSR_TEND; + break; + } + } + + *SCFTDR = c; + if (fsr_bits_to_clear != 0) + *SCFSR &= ~fsr_bits_to_clear; +} + +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; +} + +#define FSR_ERR_CLEAR 0x0063 +#define RDRF_CLEAR 0x00fc +#define LSR_ORER 1 +void handle_error( void ){ + + (void)*SCFSR ; + *SCFSR = FSR_ERR_CLEAR ; + (void)*SCLSR ; + *SCLSR = 0x00 ; +} + +int serial_getc_check( void ){ + unsigned short status; + + status = *SCFSR ; + + if (status & (FSR_FER | FSR_FER | FSR_ER | FSR_BRK)) + handle_error(); + if( *SCLSR & LSR_ORER ) + handle_error(); + return (status & ( FSR_DR | FSR_RDF )); +} + +int serial_getc (void) +{ + unsigned short status ; + char ch; + while(!serial_getc_check()); + + ch = *SCFRDR; + status = *SCFSR ; + + *SCFSR = RDRF_CLEAR ; + + if (status & (FSR_FER | FSR_FER | FSR_ER | FSR_BRK)) + handle_error(); + + if( *SCLSR & LSR_ORER ) + handle_error(); + + return ch ; +} + +#endif /* CFG_SCIF_CONSOLE */ |