/* * (C) Copyright 2003 * Martin Winistoerfer, martinwinistoerfer@gmx.ch. * * 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, */ /* * File: serial.c * * Discription: Serial interface driver for SCI1 and SCI2. * Since this code will be called from ROM use * only non-static local variables. * */ #include <common.h> #include <watchdog.h> #include <command.h> #include <mpc5xx.h> DECLARE_GLOBAL_DATA_PTR; /* * Local function prototypes */ static int ready_to_send(void); /* * Minimal global serial functions needed to use one of the SCI modules. */ int serial_init (void) { volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR; serial_setbrg(); #if defined(CONFIG_5xx_CONS_SCI1) /* 10-Bit, 1 start bit, 8 data bit, no parity, 1 stop bit */ immr->im_qsmcm.qsmcm_scc1r1 = SCI_M_10; immr->im_qsmcm.qsmcm_scc1r1 = SCI_TE | SCI_RE; #else immr->im_qsmcm.qsmcm_scc2r1 = SCI_M_10; immr->im_qsmcm.qsmcm_scc2r1 = SCI_TE | SCI_RE; #endif return 0; } void serial_putc(const char c) { volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR; /* Test for completition */ if(ready_to_send()) { #if defined(CONFIG_5xx_CONS_SCI1) immr->im_qsmcm.qsmcm_sc1dr = (short)c; #else immr->im_qsmcm.qsmcm_sc2dr = (short)c; #endif if(c == '\n') { if(ready_to_send()); #if defined(CONFIG_5xx_CONS_SCI1) immr->im_qsmcm.qsmcm_sc1dr = (short)'\r'; #else immr->im_qsmcm.qsmcm_sc2dr = (short)'\r'; #endif } } } int serial_getc(void) { volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR; volatile short status; unsigned char tmp; /* New data ? */ do { #if defined(CONFIG_5xx_CONS_SCI1) status = immr->im_qsmcm.qsmcm_sc1sr; #else status = immr->im_qsmcm.qsmcm_sc2sr; #endif #if defined(CONFIG_WATCHDOG) reset_5xx_watchdog (immr); #endif } while ((status & SCI_RDRF) == 0); /* Read data */ #if defined(CONFIG_5xx_CONS_SCI1) tmp = (unsigned char)(immr->im_qsmcm.qsmcm_sc1dr & SCI_SCXDR_MK); #else tmp = (unsigned char)( immr->im_qsmcm.qsmcm_sc2dr & SCI_SCXDR_MK); #endif return tmp; } int serial_tstc() { volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR; short status; /* New data character ? */ #if defined(CONFIG_5xx_CONS_SCI1) status = immr->im_qsmcm.qsmcm_sc1sr; #else status = immr->im_qsmcm.qsmcm_sc2sr; #endif return (status & SCI_RDRF); } void serial_setbrg (void) { volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR; short scxbr; /* Set baudrate */ scxbr = (gd->cpu_clk / (32 * gd->baudrate)); #if defined(CONFIG_5xx_CONS_SCI1) immr->im_qsmcm.qsmcm_scc1r0 = (scxbr & SCI_SCXBR_MK); #else immr->im_qsmcm.qsmcm_scc2r0 = (scxbr & SCI_SCXBR_MK); #endif } void serial_puts (const char *s) { while (*s) { serial_putc(*s); ++s; } } int ready_to_send(void) { volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR; volatile short status; do { #if defined(CONFIG_5xx_CONS_SCI1) status = immr->im_qsmcm.qsmcm_sc1sr; #else status = immr->im_qsmcm.qsmcm_sc2sr; #endif #if defined(CONFIG_WATCHDOG) reset_5xx_watchdog (immr); #endif } while ((status & SCI_TDRE) == 0); return 1; }