/* * (C) Copyright 2004, Freescale, Inc * TsiChung Liew, Tsi-Chung.Liew@freescale.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 * */ /* * Minimal serial functions needed to use one of the PSC ports * as serial console interface. */ #include <common.h> #include <mpc8220.h> DECLARE_GLOBAL_DATA_PTR; #define PSC_BASE MMAP_PSC1 #if defined(CONFIG_PSC_CONSOLE) int serial_init (void) { volatile psc8220_t *psc = (psc8220_t *) PSC_BASE; u32 counter; /* write to SICR: SIM2 = uart mode,dcd does not affect rx */ psc->cr = 0; psc->ipcr_acr = 0; psc->isr_imr = 0; /* write to CSR: RX/TX baud rate from timers */ psc->sr_csr = 0xdd000000; psc->mr1_2 = PSC_MR1_BITS_CHAR_8 | PSC_MR1_NO_PARITY | PSC_MR2_STOP_BITS_1; /* Setting up BaudRate */ counter = ((gd->bus_clk / gd->baudrate)) >> 5; counter++; /* write to CTUR: divide counter upper byte */ psc->ctur = ((counter & 0xff00) << 16); /* write to CTLR: divide counter lower byte */ psc->ctlr = ((counter & 0x00ff) << 24); psc->cr = PSC_CR_RST_RX_CMD; psc->cr = PSC_CR_RST_TX_CMD; psc->cr = PSC_CR_RST_ERR_STS_CMD; psc->cr = PSC_CR_RST_BRK_INT_CMD; psc->cr = PSC_CR_RST_MR_PTR_CMD; psc->cr = PSC_CR_RX_ENABLE | PSC_CR_TX_ENABLE; return (0); } void serial_putc (const char c) { volatile psc8220_t *psc = (psc8220_t *) PSC_BASE; if (c == '\n') serial_putc ('\r'); /* Wait for last character to go. */ while (!(psc->sr_csr & PSC_SR_TXRDY)); psc->xmitbuf[0] = c; } void serial_puts (const char *s) { while (*s) { serial_putc (*s++); } } int serial_getc (void) { volatile psc8220_t *psc = (psc8220_t *) PSC_BASE; /* Wait for a character to arrive. */ while (!(psc->sr_csr & PSC_SR_RXRDY)); return psc->xmitbuf[2]; } int serial_tstc (void) { volatile psc8220_t *psc = (psc8220_t *) PSC_BASE; return (psc->sr_csr & PSC_SR_RXRDY); } void serial_setbrg (void) { volatile psc8220_t *psc = (psc8220_t *) PSC_BASE; u32 counter; counter = ((gd->bus_clk / gd->baudrate)) >> 5; counter++; /* write to CTUR: divide counter upper byte */ psc->ctur = ((counter & 0xff00) << 16); /* write to CTLR: divide counter lower byte */ psc->ctlr = ((counter & 0x00ff) << 24); psc->cr = PSC_CR_RST_RX_CMD; psc->cr = PSC_CR_RST_TX_CMD; psc->cr = PSC_CR_RX_ENABLE | PSC_CR_TX_ENABLE; } #endif /* CONFIG_PSC_CONSOLE */