Merge with /home/stefan/git/u-boot/denx

1 files changed, 204 insertions, 0 deletions

diff --git a/cpu/mpc86xx/interrupts.c b/cpu/mpc86xx/interrupts.c
new file mode 100644
index 0000000..1df6cdc
--- /dev/null
+++ b/cpu/mpc86xx/interrupts.c
@@ -0,0 +1,204 @@
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2002 (440 port)
+ * Scott McNutt, Artesyn Communication Producs, smcnutt@artsyncp.com
+ *
+ * (C) Copyright 2003 Motorola Inc. (MPC85xx port)
+ * Xianghua Xiao (X.Xiao@motorola.com)
+ *
+ * (C) Copyright 2004 Freescale Semiconductor. (MPC86xx Port)
+ * Jeff Brown
+ * Srikanth Srinivasan (srikanth.srinivasan@freescale.com)
+ *
+ * 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 <mpc86xx.h>
+#include <command.h>
+#include <asm/processor.h>
+#include <ppc_asm.tmpl>
+
+unsigned long decrementer_count;    /* count value for 1e6/HZ microseconds */
+unsigned long timestamp;
+
+
+static __inline__ unsigned long get_msr(void)
+{
+	unsigned long msr;
+
+	asm volatile ("mfmsr %0":"=r" (msr):);
+
+	return msr;
+}
+
+static __inline__ void set_msr(unsigned long msr)
+{
+	asm volatile ("mtmsr %0"::"r" (msr));
+}
+
+static __inline__ unsigned long get_dec(void)
+{
+	unsigned long val;
+
+	asm volatile ("mfdec %0":"=r" (val):);
+
+	return val;
+}
+
+static __inline__ void set_dec(unsigned long val)
+{
+	if (val)
+		asm volatile ("mtdec %0"::"r" (val));
+}
+
+/* interrupt is not supported yet */
+int interrupt_init_cpu(unsigned *decrementer_count)
+{
+	return 0;
+}
+
+int interrupt_init(void)
+{
+	int ret;
+
+	/* call cpu specific function from $(CPU)/interrupts.c */
+	ret = interrupt_init_cpu(&decrementer_count);
+
+	if (ret)
+		return ret;
+
+	decrementer_count = get_tbclk() / CFG_HZ;
+	debug("interrupt init: tbclk() = %d MHz, decrementer_count = %d\n",
+	      (get_tbclk() / 1000000),
+	      decrementer_count);
+
+	set_dec(decrementer_count);
+
+	set_msr(get_msr() | MSR_EE);
+
+	debug("MSR = 0x%08lx, Decrementer reg = 0x%08lx\n",
+	      get_msr(),
+	      get_dec());
+
+	return 0;
+}
+
+void enable_interrupts(void)
+{
+	set_msr(get_msr() | MSR_EE);
+}
+
+/* returns flag if MSR_EE was set before */
+int disable_interrupts(void)
+{
+	ulong msr = get_msr();
+
+	set_msr(msr & ~MSR_EE);
+	return (msr & MSR_EE) != 0;
+}
+
+void increment_timestamp(void)
+{
+	timestamp++;
+}
+
+/*
+ * timer_interrupt - gets called when the decrementer overflows,
+ * with interrupts disabled.
+ * Trivial implementation - no need to be really accurate.
+ */
+void timer_interrupt_cpu(struct pt_regs *regs)
+{
+	/* nothing to do here */
+}
+
+void timer_interrupt(struct pt_regs *regs)
+{
+	/* call cpu specific function from $(CPU)/interrupts.c */
+	timer_interrupt_cpu(regs);
+
+	timestamp++;
+
+	ppcDcbf(&timestamp);
+
+	/* Restore Decrementer Count */
+	set_dec(decrementer_count);
+
+#if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG)
+	if ((timestamp % (CFG_WATCHDOG_FREQ)) == 0)
+		WATCHDOG_RESET();
+#endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */
+
+#ifdef CONFIG_STATUS_LED
+	status_led_tick(timestamp);
+#endif /* CONFIG_STATUS_LED */
+
+#ifdef CONFIG_SHOW_ACTIVITY
+	board_show_activity(timestamp);
+#endif /* CONFIG_SHOW_ACTIVITY */
+
+}
+
+void reset_timer(void)
+{
+	timestamp = 0;
+}
+
+ulong get_timer(ulong base)
+{
+	return timestamp - base;
+}
+
+void set_timer(ulong t)
+{
+	timestamp = t;
+}
+
+/*
+ * Install and free a interrupt handler. Not implemented yet.
+ */
+
+void irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
+{
+}
+
+void irq_free_handler(int vec)
+{
+}
+
+/*
+ * irqinfo - print information about PCI devices,not implemented.
+ */
+int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	printf("\nInterrupt-unsupported:\n");
+
+	return 0;
+}
+
+/*
+ * Handle external interrupts
+ */
+void external_interrupt(struct pt_regs *regs)
+{
+	puts("external_interrupt (oops!)\n");
+}