/* * U-boot - serial.c Serial driver for BF533 * * Copyright (c) 2005 blackfin.uclinux.org * * This file is based on * bf533_serial.c: Serial driver for BlackFin BF533 DSP internal UART. * Copyright (c) 2003 Bas Vermeulen <bas@buyways.nl>, * BuyWays B.V. (www.buyways.nl) * * Based heavily on blkfinserial.c * blkfinserial.c: Serial driver for BlackFin DSP internal USRTs. * Copyright(c) 2003 Metrowerks <mwaddel@metrowerks.com> * Copyright(c) 2001 Tony Z. Kou <tonyko@arcturusnetworks.com> * Copyright(c) 2001-2002 Arcturus Networks Inc. <www.arcturusnetworks.com> * * Based on code from 68328 version serial driver imlpementation which was: * Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu> * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> * Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org> * Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com> * * (C) Copyright 2000-2004 * 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 */ #include <common.h> #include <asm/irq.h> #include <asm/system.h> #include <asm/segment.h> #include <asm/bitops.h> #include <asm/delay.h> #include <asm/uaccess.h> #include "bf533_serial.h" DECLARE_GLOBAL_DATA_PTR; unsigned long pll_div_fact; void calc_baud(void) { unsigned char i; int temp; for(i = 0; i < sizeof(baud_table)/sizeof(int); i++) { temp = CONFIG_SCLK_HZ/(baud_table[i]*8); if ( temp && 0x1 == 1 ) { temp++; } temp = temp/2; hw_baud_table[i].dl_high = (temp >> 8)& 0xFF; hw_baud_table[i].dl_low = (temp) & 0xFF; } } void serial_setbrg(void) { int i; calc_baud(); for (i = 0; i < sizeof(baud_table) / sizeof(int); i++) { if (gd->baudrate == baud_table[i]) break; } /* Enable UART */ *pUART_GCTL |= UART_GCTL_UCEN; asm("ssync;"); /* Set DLAB in LCR to Access DLL and DLH */ ACCESS_LATCH; asm("ssync;"); *pUART_DLL = hw_baud_table[i].dl_low; asm("ssync;"); *pUART_DLH = hw_baud_table[i].dl_high; asm("ssync;"); /* Clear DLAB in LCR to Access THR RBR IER */ ACCESS_PORT_IER; asm("ssync;"); /* Enable ERBFI and ELSI interrupts * to poll SIC_ISR register*/ *pUART_IER = UART_IER_ELSI | UART_IER_ERBFI | UART_IER_ETBEI; asm("ssync;"); /* Set LCR to Word Lengh 8-bit word select */ *pUART_LCR = UART_LCR_WLS8; asm("ssync;"); return; } int serial_init(void) { serial_setbrg(); return (0); } void serial_putc(const char c) { if ((*pUART_LSR) & UART_LSR_TEMT) { if (c == '\n') serial_putc('\r'); local_put_char(c); } while (!((*pUART_LSR) & UART_LSR_TEMT)) SYNC_ALL; return; } int serial_tstc(void) { if (*pUART_LSR & UART_LSR_DR) return 1; else return 0; } int serial_getc(void) { unsigned short uart_lsr_val, uart_rbr_val; unsigned long isr_val; int ret; /* Poll for RX Interrupt */ while (!((isr_val = *(volatile unsigned long *)SIC_ISR) & IRQ_UART_RX_BIT)); asm("csync;"); uart_lsr_val = *pUART_LSR; /* Clear status bit */ uart_rbr_val = *pUART_RBR; /* getc() */ if (isr_val & IRQ_UART_ERROR_BIT) { ret = -1; } else { ret = uart_rbr_val & 0xff; } return ret; } void serial_puts(const char *s) { while (*s) { serial_putc(*s++); } } static void local_put_char(char ch) { int flags = 0; unsigned long isr_val; save_and_cli(flags); /* Poll for TX Interruput */ while (!((isr_val = *pSIC_ISR) & IRQ_UART_TX_BIT)); asm("csync;"); *pUART_THR = ch; /* putc() */ if (isr_val & IRQ_UART_ERROR_BIT) { printf("?"); } restore_flags(flags); return ; }