1 files changed, 273 insertions, 0 deletions
diff --git a/cpu/mpc5xx/interrupts.c b/cpu/mpc5xx/interrupts.c
new file mode 100644
index 0000000..282c316
--- /dev/null
+++ b/cpu/mpc5xx/interrupts.c
@@ -0,0 +1,273 @@
+/*
+ * (C) Copyright 2000-2002	Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ * (C) Copyright 2003		Martin Winistoerfer, martinwinistoerfer@gmx.ch.
+ *
+ * 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, 
+ */
+
+/*
+ * File:		interrupt.c
+ * 
+ * Discription:		Contains interrupt routines needed by U-Boot
+ *
+ */
+
+#include <common.h>
+#include <watchdog.h>
+#include <mpc5xx.h>
+#include <asm/processor.h>
+
+/************************************************************************/
+
+unsigned decrementer_count;	/* count value for 1e6/HZ microseconds	*/
+
+/************************************************************************/
+
+struct interrupt_action {
+	interrupt_handler_t *handler;
+	void *arg;
+};
+
+static struct interrupt_action irq_vecs[NR_IRQS];
+
+/*
+ * Local function prototypes 
+ */
+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)
+{
+	asm volatile ("mtdec %0"::"r" (val));
+}
+
+/*
+ * Enable interrupts 
+ */ 
+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);
+}
+
+/*
+ * Initialise interrupts 
+ */
+
+int interrupt_init (void)
+{
+	volatile immap_t *immr = (immap_t *) CFG_IMMR;
+
+	/* Decrementer used here for status led */
+	decrementer_count = get_tbclk () / CFG_HZ;
+
+	/* Disable all interrupts */
+	immr->im_siu_conf.sc_simask = 0;
+
+	set_dec (decrementer_count);
+
+	set_msr (get_msr () | MSR_EE);
+	return (0);
+}
+
+/*
+ * Handle external interrupts
+ */
+void external_interrupt (struct pt_regs *regs)
+{
+	volatile immap_t *immr = (immap_t *) CFG_IMMR;
+	int irq;
+	ulong simask, newmask;
+	ulong vec, v_bit;
+
+	/*
+	 * read the SIVEC register and shift the bits down
+	 * to get the irq number
+	 */
+	vec = immr->im_siu_conf.sc_sivec;
+	irq = vec >> 26;
+	v_bit = 0x80000000UL >> irq;
+
+	/*
+	 * Read Interrupt Mask Register and Mask Interrupts
+	 */
+	simask = immr->im_siu_conf.sc_simask;
+	newmask = simask & (~(0xFFFF0000 >> irq));
+	immr->im_siu_conf.sc_simask = newmask;
+
+	if (!(irq & 0x1)) {		/* External Interrupt ?     */
+		ulong siel;
+
+		/*
+		 * Read Interrupt Edge/Level Register
+		 */
+		siel = immr->im_siu_conf.sc_siel;
+
+		if (siel & v_bit) {	/* edge triggered interrupt ?   */
+			/*
+			 * Rewrite SIPEND Register to clear interrupt
+			 */
+			immr->im_siu_conf.sc_sipend = v_bit;
+		}
+	}
+
+	if (irq_vecs[irq].handler != NULL) {
+		irq_vecs[irq].handler (irq_vecs[irq].arg);
+	} else {
+		printf ("\nBogus External Interrupt IRQ %d Vector %ld\n",
+				irq, vec);
+		/* turn off the bogus interrupt to avoid it from now */
+		simask &= ~v_bit;
+	}
+	/*
+	 * Re-Enable old Interrupt Mask
+	 */
+	immr->im_siu_conf.sc_simask = simask;
+}
+
+/*
+ * Install and free an interrupt handler
+ */
+void irq_install_handler (int vec, interrupt_handler_t * handler,
+						  void *arg)
+{
+	volatile immap_t *immr = (immap_t *) CFG_IMMR;
+	/* SIU interrupt */
+	if (irq_vecs[vec].handler != NULL) {
+		printf ("SIU interrupt %d 0x%x\n",
+			vec,
+			(uint) handler);
+	}
+	irq_vecs[vec].handler = handler;
+	irq_vecs[vec].arg = arg;
+	immr->im_siu_conf.sc_simask |= 1 << (31 - vec);
+#if 0
+	printf ("Install SIU interrupt for vector %d ==> %p\n",
+		vec, handler);
+#endif
+}
+
+void irq_free_handler (int vec)
+{
+	volatile immap_t *immr = (immap_t *) CFG_IMMR;
+	/* SIU interrupt */
+#if 0
+	printf ("Free CPM interrupt for vector %d\n",
+		vec);
+#endif
+	immr->im_siu_conf.sc_simask &= ~(1 << (31 - vec));
+	irq_vecs[vec].handler = NULL;
+	irq_vecs[vec].arg = NULL;
+}
+
+volatile ulong timestamp = 0;
+
+/*
+ *  Timer interrupt - gets called when  bit 0 of DEC changes from 
+ *  0. Decrementer is enabled with bit TBE in TBSCR.
+ */
+void timer_interrupt (struct pt_regs *regs)
+{
+	volatile immap_t *immr = (immap_t *) CFG_IMMR;
+
+#ifdef CONFIG_STATUS_LED
+	extern void status_led_tick (ulong);
+#endif
+#if 0
+	printf ("*** Timer Interrupt *** ");
+#endif
+	/* Reset Timer Status Bit and Timers Interrupt Status */
+	immr->im_clkrstk.cark_plprcrk = KAPWR_KEY;
+	__asm__ ("nop");
+	immr->im_clkrst.car_plprcr |= PLPRCR_TEXPS | PLPRCR_TMIST;
+	
+	/* Restore Decrementer Count */
+	set_dec (decrementer_count);
+
+	timestamp++;
+
+#ifdef CONFIG_STATUS_LED
+	status_led_tick (timestamp);
+#endif /* CONFIG_STATUS_LED */
+
+#if defined(CONFIG_WATCHDOG)
+	/*
+	 * The shortest watchdog period of all boards
+	 * is approx. 1 sec, thus re-trigger watchdog at least
+	 * every 500 ms = CFG_HZ / 2
+	 */
+	if ((timestamp % (CFG_HZ / 2)) == 0) {
+		reset_5xx_watchdog (immr);
+	}
+#endif /* CONFIG_WATCHDOG */
+}
+
+/*
+ * Reset timer 
+ */
+void reset_timer (void)
+{
+	timestamp = 0;
+}
+
+/*
+ * Get Timer
+ */
+ulong get_timer (ulong base)
+{
+	return (timestamp - base);
+}
+
+/*
+ * Set timer
+ */
+void set_timer (ulong t)
+{
+	timestamp = t;
+}