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authorAubrey Li <aubrey.adi@gmail.com>2007-03-20 18:16:24 +0800
committerAubrey Li <aubrey.adi@gmail.com>2007-03-20 18:16:24 +0800
commit654589873dbafcf104dff133ce0d03a4506e9cc3 (patch)
tree0a2ff21805cbcfe5078a245245b5318db587fb7c /cpu/bf561/serial.c
parenta20e7106928a284a6d14c066c54b72e552075b06 (diff)
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[Blackfin][PATCH] Add BF561 EZKIT board support
Diffstat (limited to 'cpu/bf561/serial.c')
-rw-r--r--cpu/bf561/serial.c196
1 files changed, 196 insertions, 0 deletions
diff --git a/cpu/bf561/serial.c b/cpu/bf561/serial.c
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+/*
+ * U-boot - serial.c Serial driver for BF561
+ *
+ * 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 "serial.h"
+#include <asm/io.h>
+
+unsigned long pll_div_fact;
+
+void calc_baud(void)
+{
+ unsigned char i;
+ int temp;
+ u_long sclk = get_sclk();
+
+ for (i = 0; i < sizeof(baud_table) / sizeof(int); i++) {
+ temp = sclk / (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;
+ DECLARE_GLOBAL_DATA_PTR;
+
+ 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;
+ sync();
+
+ /* Set DLAB in LCR to Access DLL and DLH */
+ ACCESS_LATCH;
+ sync();
+
+ *pUART_DLL = hw_baud_table[i].dl_low;
+ sync();
+ *pUART_DLH = hw_baud_table[i].dl_high;
+ sync();
+
+ /* Clear DLAB in LCR to Access THR RBR IER */
+ ACCESS_PORT_IER;
+ sync();
+
+ /*
+ * Enable ERBFI and ELSI interrupts
+ * to poll SIC_ISR register
+ */
+ *pUART_IER = UART_IER_ELSI | UART_IER_ERBFI | UART_IER_ETBEI;
+ sync();
+
+ /* Set LCR to Word Lengh 8-bit word select */
+ *pUART_LCR = UART_LCR_WLS8;
+ sync();
+
+ 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;
+}