[Blackfin][PATCH] Add BF537 stamp board support

1 files changed, 174 insertions, 0 deletions

diff --git a/cpu/bf537/interrupts.c b/cpu/bf537/interrupts.c
new file mode 100644
index 0000000..2ca76ec
--- /dev/null
+++ b/cpu/bf537/interrupts.c
@@ -0,0 +1,174 @@
+/*
+ * U-boot - interrupts.c Interrupt related routines
+ *
+ * Copyright (c) 2005 blackfin.uclinux.org
+ *
+ * This file is based on interrupts.c
+ * Copyright 1996 Roman Zippel
+ * Copyright 1999 D. Jeff Dionne <jeff@uclinux.org>
+ * Copyright 2000-2001 Lineo, Inc. D. Jefff Dionne <jeff@lineo.ca>
+ * Copyright 2002 Arcturus Networks Inc. MaTed <mated@sympatico.ca>
+ * Copyright 2003 Metrowerks/Motorola
+ * Copyright 2003 Bas Vermeulen <bas@buyways.nl>,
+ *			BuyWays B.V. (www.buyways.nl)
+ *
+ * (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/machdep.h>
+#include <asm/irq.h>
+#include <config.h>
+#include <asm/blackfin.h>
+#include "cpu.h"
+
+static ulong timestamp;
+static ulong last_time;
+static int int_flag;
+
+int irq_flags;			/* needed by asm-blackfin/system.h */
+
+/* Functions just to satisfy the linker */
+
+/*
+ * This function is derived from PowerPC code (read timebase as long long).
+ * On BF533 it just returns the timer value.
+ */
+unsigned long long get_ticks(void)
+{
+	return get_timer(0);
+}
+
+/*
+ * This function is derived from PowerPC code (timebase clock frequency).
+ * On BF533 it returns the number of timer ticks per second.
+ */
+ulong get_tbclk (void)
+{
+	ulong tbclk;
+
+	tbclk = CFG_HZ;
+	return tbclk;
+}
+
+void enable_interrupts(void)
+{
+	restore_flags(int_flag);
+}
+
+int disable_interrupts(void)
+{
+	save_and_cli(int_flag);
+	return 1;
+}
+
+int interrupt_init(void)
+{
+	return (0);
+}
+
+void udelay(unsigned long usec)
+{
+	unsigned long delay, start, stop;
+	unsigned long cclk;
+	cclk = (CONFIG_CCLK_HZ);
+
+	while (usec > 1) {
+		/*
+		 * how many clock ticks to delay?
+		 *  - request(in useconds) * clock_ticks(Hz) / useconds/second
+		 */
+		if (usec < 1000) {
+			delay = (usec * (cclk / 244)) >> 12;
+			usec = 0;
+		} else {
+			delay = (1000 * (cclk / 244)) >> 12;
+			usec -= 1000;
+		}
+
+		asm volatile (" %0 = CYCLES;":"=r" (start));
+		do {
+			asm volatile (" %0 = CYCLES; ":"=r" (stop));
+		} while (stop - start < delay);
+	}
+
+	return;
+}
+
+void timer_init(void)
+{
+	*pTCNTL = 0x1;
+	*pTSCALE = 0x0;
+	*pTCOUNT = MAX_TIM_LOAD;
+	*pTPERIOD = MAX_TIM_LOAD;
+	*pTCNTL = 0x7;
+	asm("CSYNC;");
+
+	timestamp = 0;
+	last_time = 0;
+}
+
+/* Any network command or flash
+ * command is started get_timer shall
+ * be called before TCOUNT gets reset,
+ * to implement the accurate timeouts.
+ *
+ * How ever milliconds doesn't return
+ * the number that has been elapsed from
+ * the last reset.
+ *
+ *  As get_timer is used in the u-boot
+ *  only for timeouts this should be
+ *  sufficient
+ */
+ulong get_timer(ulong base)
+{
+	ulong milisec;
+
+	/* Number of clocks elapsed */
+	ulong clocks = (MAX_TIM_LOAD - (*pTCOUNT));
+
+	/**
+	 * Find if the TCOUNT is reset
+	 * timestamp gives the number of times
+	 * TCOUNT got reset
+	 */
+	if (clocks < last_time)
+		timestamp++;
+	last_time = clocks;
+
+	/* Get the number of milliseconds */
+	milisec = clocks / (CONFIG_CCLK_HZ / 1000);
+
+	/**
+	 * Find the number of millisonds
+	 * that got elapsed before this TCOUNT cycle
+	 */
+	milisec += timestamp * (MAX_TIM_LOAD / (CONFIG_CCLK_HZ / 1000));
+
+	return (milisec - base);
+}
+
+void reset_timer (void)
+{
+	timestamp = 0;
+}