mirror of
https://github.com/AsahiLinux/u-boot
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126 lines
3 KiB
C
126 lines
3 KiB
C
/*
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* (C) Copyright 2004, Freescale, Inc
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* TsiChung Liew, Tsi-Chung.Liew@freescale.com.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*/
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/*
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* Minimal serial functions needed to use one of the PSC ports
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* as serial console interface.
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*/
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#include <common.h>
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#include <mpc8220.h>
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DECLARE_GLOBAL_DATA_PTR;
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#define PSC_BASE MMAP_PSC1
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#if defined(CONFIG_PSC_CONSOLE)
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int serial_init (void)
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{
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volatile psc8220_t *psc = (psc8220_t *) PSC_BASE;
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u32 counter;
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/* write to SICR: SIM2 = uart mode,dcd does not affect rx */
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psc->cr = 0;
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psc->ipcr_acr = 0;
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psc->isr_imr = 0;
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/* write to CSR: RX/TX baud rate from timers */
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psc->sr_csr = 0xdd000000;
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psc->mr1_2 = PSC_MR1_BITS_CHAR_8 | PSC_MR1_NO_PARITY | PSC_MR2_STOP_BITS_1;
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/* Setting up BaudRate */
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counter = ((gd->bus_clk / gd->baudrate)) >> 5;
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counter++;
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/* write to CTUR: divide counter upper byte */
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psc->ctur = ((counter & 0xff00) << 16);
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/* write to CTLR: divide counter lower byte */
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psc->ctlr = ((counter & 0x00ff) << 24);
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psc->cr = PSC_CR_RST_RX_CMD;
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psc->cr = PSC_CR_RST_TX_CMD;
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psc->cr = PSC_CR_RST_ERR_STS_CMD;
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psc->cr = PSC_CR_RST_BRK_INT_CMD;
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psc->cr = PSC_CR_RST_MR_PTR_CMD;
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psc->cr = PSC_CR_RX_ENABLE | PSC_CR_TX_ENABLE;
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return (0);
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}
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void serial_putc (const char c)
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{
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volatile psc8220_t *psc = (psc8220_t *) PSC_BASE;
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if (c == '\n')
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serial_putc ('\r');
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/* Wait for last character to go. */
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while (!(psc->sr_csr & PSC_SR_TXRDY));
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psc->xmitbuf[0] = c;
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}
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void serial_puts (const char *s)
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{
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while (*s) {
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serial_putc (*s++);
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}
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}
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int serial_getc (void)
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{
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volatile psc8220_t *psc = (psc8220_t *) PSC_BASE;
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/* Wait for a character to arrive. */
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while (!(psc->sr_csr & PSC_SR_RXRDY));
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return psc->xmitbuf[2];
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}
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int serial_tstc (void)
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{
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volatile psc8220_t *psc = (psc8220_t *) PSC_BASE;
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return (psc->sr_csr & PSC_SR_RXRDY);
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}
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void serial_setbrg (void)
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{
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volatile psc8220_t *psc = (psc8220_t *) PSC_BASE;
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u32 counter;
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counter = ((gd->bus_clk / gd->baudrate)) >> 5;
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counter++;
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/* write to CTUR: divide counter upper byte */
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psc->ctur = ((counter & 0xff00) << 16);
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/* write to CTLR: divide counter lower byte */
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psc->ctlr = ((counter & 0x00ff) << 24);
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psc->cr = PSC_CR_RST_RX_CMD;
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psc->cr = PSC_CR_RST_TX_CMD;
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psc->cr = PSC_CR_RX_ENABLE | PSC_CR_TX_ENABLE;
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}
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#endif /* CONFIG_PSC_CONSOLE */
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