/* * (C) Copyright 2000 - 2007 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * 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 * * Based ont the MPC5200 PSC driver. * Adapted for MPC512x by Jan Wrobel <wrr@semihalf.com> */ /* * Minimal serial functions needed to use one of the PSC ports * as serial console interface. */ #include <common.h> DECLARE_GLOBAL_DATA_PTR; #if defined(CONFIG_PSC_CONSOLE) static void fifo_init (volatile psc512x_t *psc) { volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR; /* reset Rx & Tx fifo slice */ psc->rfcmd = PSC_FIFO_RESET_SLICE; psc->tfcmd = PSC_FIFO_RESET_SLICE; /* disable Tx & Rx FIFO interrupts */ psc->rfintmask = 0; psc->tfintmask = 0; psc->tfsize = CONSOLE_FIFO_TX_SIZE | (CONSOLE_FIFO_TX_ADDR << 16); psc->rfsize = CONSOLE_FIFO_RX_SIZE | (CONSOLE_FIFO_RX_ADDR << 16); /* enable Tx & Rx FIFO slice */ psc->rfcmd = PSC_FIFO_ENABLE_SLICE; psc->tfcmd = PSC_FIFO_ENABLE_SLICE; im->fifoc.fifoc_cmd = FIFOC_DISABLE_CLOCK_GATE; __asm__ volatile ("sync"); } int serial_init(void) { volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR; volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE]; unsigned long baseclk; int div; fifo_init (psc); /* set MR register to point to MR1 */ psc->command = PSC_SEL_MODE_REG_1; /* disable Tx/Rx */ psc->command = PSC_TX_DISABLE | PSC_RX_DISABLE; /* choose the prescaler by 16 for the Tx/Rx clock generation */ psc->psc_clock_select = 0xdd00; /* switch to UART mode */ psc->sicr = 0; /* mode register points to mr1 */ /* configure parity, bit length and so on in mode register 1*/ psc->mode = PSC_MODE_8_BITS | PSC_MODE_PARNONE; /* now, mode register points to mr2 */ psc->mode = PSC_MODE_1_STOPBIT; /* calculate dividor for setting PSC CTUR and CTLR registers */ baseclk = (gd->ips_clk + 8) / 16; div = (baseclk + (gd->baudrate / 2)) / gd->baudrate; psc->ctur = (div >> 8) & 0xff; /* set baudrate */ psc->ctlr = div & 0xff; /* disable all interrupts */ psc->psc_imr = 0; /* reset and enable Rx/Tx */ psc->command = PSC_RST_RX; psc->command = PSC_RST_TX; psc->command = PSC_RX_ENABLE | PSC_TX_ENABLE; return 0; } void serial_putc (const char c) { volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR; volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE]; if (c == '\n') serial_putc ('\r'); /* Wait for last character to go. */ while (!(psc->psc_status & PSC_SR_TXEMP)) ; psc->tfdata_8 = c; } void serial_putc_raw (const char c) { volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR; volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE]; /* Wait for last character to go. */ while (!(psc->psc_status & PSC_SR_TXEMP)) ; psc->tfdata_8 = c; } void serial_puts (const char *s) { while (*s) { serial_putc (*s++); } } int serial_getc (void) { volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR; volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE]; /* Wait for a character to arrive. */ while (psc->rfstat & PSC_FIFO_EMPTY) ; return psc->rfdata_8; } int serial_tstc (void) { volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR; volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE]; return !(psc->rfstat & PSC_FIFO_EMPTY); } void serial_setbrg (void) { volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR; volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE]; unsigned long baseclk, div; baseclk = (gd->csb_clk + 8) / 16; div = (baseclk + (gd->baudrate / 2)) / gd->baudrate; psc->ctur = (div >> 8) & 0xFF; psc->ctlr = div & 0xff; /* set baudrate */ } void serial_setrts(int s) { volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR; volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE]; if (s) { /* Assert RTS (become LOW) */ psc->op1 = 0x1; } else { /* Negate RTS (become HIGH) */ psc->op0 = 0x1; } } int serial_getcts(void) { volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR; volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE]; return (psc->ip & 0x1) ? 0 : 1; } #endif /* CONFIG_PSC_CONSOLE */