* Patch by Martin Winistoerfer, 23 Mar 2003
- Add port to MPC555/556 microcontrollers
- Add support for cmi customer board with
Intel 28F128J3A, 28F320J3A or 28F640J3A flash.
* Patch by Rick Bronson, 28 Mar 2003:
- fix common/cmd_nand.c
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;
+}