[Blackfin][PATCH] Add BF537 stamp board support

1 files changed, 194 insertions, 0 deletions

diff --git a/cpu/bf537/serial.c b/cpu/bf537/serial.c
new file mode 100644
index 0000000..dd4f916
--- /dev/null
+++ b/cpu/bf537/serial.c
@@ -0,0 +1,194 @@
+/*
+ * U-boot - serial.c Serial driver for BF537
+ *
+ * Copyright (c) 2005 blackfin.uclinux.org
+ *
+ * This file is based on
+ * bf537_serial.c: Serial driver for BlackFin BF537 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 <asm/io.h>
+#include "serial.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;
+}