* Patches by Richard Woodruff, 01 Oct 2004:

  add support for the TI OMAP2420 processor and its H4 reference
  board

* Patch by Christian Pellegrin, 24 Sep 2004:
  Added support for NE2000 compatible (DP8390, DP83902) NICs.

1 files changed, 293 insertions, 0 deletions

diff --git a/cpu/arm1136/interrupts.c b/cpu/arm1136/interrupts.c
new file mode 100644
index 0000000..bd7bb7c
--- /dev/null
+++ b/cpu/arm1136/interrupts.c
@@ -0,0 +1,293 @@
+/*
+ * (C) Copyright 2004

+ * Texas Instruments

+ * Richard Woodruff <r-woodruff2@ti.com>

+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <gj@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/arch/bits.h>
+#include <asm/arch/omap2420.h>
+#include <asm/proc-armv/ptrace.h>
+
+extern void reset_cpu(ulong addr);
+#define TIMER_LOAD_VAL 0
+
+/* macro to read the 32 bit timer */
+#define READ_TIMER (*(volatile ulong *)(CFG_TIMERBASE+TCRR))
+
+#ifdef CONFIG_USE_IRQ
+/* enable IRQ interrupts */
+void enable_interrupts (void)
+{
+	unsigned long temp;
+	__asm__ __volatile__("mrs %0, cpsr\n"
+						 "bic %0, %0, #0x80\n"
+						 "msr cpsr_c, %0"
+						 : "=r" (temp)
+						 :
+						 : "memory");
+}
+
+/*
+ * disable IRQ/FIQ interrupts
+ * returns true if interrupts had been enabled before we disabled them
+ */
+int disable_interrupts (void)
+{
+	unsigned long old,temp;
+	__asm__ __volatile__("mrs %0, cpsr\n"
+						 "orr %1, %0, #0xc0\n"
+						 "msr cpsr_c, %1"
+						 : "=r" (old), "=r" (temp)
+						 :
+						 : "memory");
+	return(old & 0x80) == 0;
+}
+#else
+void enable_interrupts (void)
+{
+	return;
+}
+int disable_interrupts (void)
+{
+	return 0;
+}
+#endif
+
+
+void bad_mode (void)
+{
+	panic ("Resetting CPU ...\n");
+	reset_cpu (0);
+}
+
+void show_regs (struct pt_regs *regs)
+{
+	unsigned long flags;
+	const char *processor_modes[] = {
+		"USER_26",  "FIQ_26",   "IRQ_26",   "SVC_26",
+		"UK4_26",   "UK5_26",   "UK6_26",   "UK7_26",
+		"UK8_26",   "UK9_26",   "UK10_26",  "UK11_26",
+		"UK12_26",  "UK13_26",  "UK14_26",  "UK15_26",
+		"USER_32",  "FIQ_32",   "IRQ_32",   "SVC_32",
+		"UK4_32",   "UK5_32",   "UK6_32",   "ABT_32",
+		"UK8_32",   "UK9_32",   "UK10_32",  "UND_32",
+		"UK12_32",  "UK13_32",  "UK14_32",  "SYS_32",
+	};
+
+	flags = condition_codes (regs);
+
+	printf ("pc : [<%08lx>]    lr : [<%08lx>]\n"
+			"sp : %08lx  ip : %08lx  fp : %08lx\n",
+			instruction_pointer (regs),
+			regs->ARM_lr, regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
+	printf ("r10: %08lx  r9 : %08lx  r8 : %08lx\n",
+			regs->ARM_r10, regs->ARM_r9, regs->ARM_r8);
+	printf ("r7 : %08lx  r6 : %08lx  r5 : %08lx  r4 : %08lx\n",
+			regs->ARM_r7, regs->ARM_r6, regs->ARM_r5, regs->ARM_r4);
+	printf ("r3 : %08lx  r2 : %08lx  r1 : %08lx  r0 : %08lx\n",
+			regs->ARM_r3, regs->ARM_r2, regs->ARM_r1, regs->ARM_r0);
+	printf ("Flags: %c%c%c%c",
+			flags & CC_N_BIT ? 'N' : 'n',
+			flags & CC_Z_BIT ? 'Z' : 'z',
+			flags & CC_C_BIT ? 'C' : 'c', flags & CC_V_BIT ? 'V' : 'v');
+	printf ("  IRQs %s  FIQs %s  Mode %s%s\n",
+			interrupts_enabled (regs) ? "on" : "off",
+			fast_interrupts_enabled (regs) ? "on" : "off",
+			processor_modes[processor_mode (regs)],
+			thumb_mode (regs) ? " (T)" : "");
+}
+
+void do_undefined_instruction (struct pt_regs *pt_regs)
+{
+	printf ("undefined instruction\n");
+	show_regs (pt_regs);
+	bad_mode ();
+}
+
+void do_software_interrupt (struct pt_regs *pt_regs)
+{
+	printf ("software interrupt\n");
+	show_regs (pt_regs);
+	bad_mode ();
+}
+
+void do_prefetch_abort (struct pt_regs *pt_regs)
+{
+	printf ("prefetch abort\n");
+	show_regs (pt_regs);
+	bad_mode ();
+}
+
+void do_data_abort (struct pt_regs *pt_regs)
+{
+	printf ("data abort\n");
+	show_regs (pt_regs);
+	bad_mode ();
+}
+
+void do_not_used (struct pt_regs *pt_regs)
+{
+	printf ("not used\n");
+	show_regs (pt_regs);
+	bad_mode ();
+}
+
+void do_fiq (struct pt_regs *pt_regs)
+{
+	printf ("fast interrupt request\n");
+	show_regs (pt_regs);
+	bad_mode ();
+}
+
+void do_irq (struct pt_regs *pt_regs)
+{
+	printf ("interrupt request\n");
+	show_regs (pt_regs);
+	bad_mode ();
+}
+
+static ulong timestamp;
+static ulong lastinc;
+
+/* nothing really to do with interrupts, just starts up a counter. */
+int interrupt_init (void)
+{
+	int32_t val;
+
+	/* Start the counter ticking up */
+	*((int32_t *) (CFG_TIMERBASE + TLDR)) = TIMER_LOAD_VAL;	/* reload value on overflow*/
+	val = (CFG_PVT << 2) | BIT5 | BIT1 | BIT0;		/* mask to enable timer*/
+	*((int32_t *) (CFG_TIMERBASE + TCLR)) = val;	/* start timer */
+
+	reset_timer_masked(); /* init the timestamp and lastinc value */
+
+	return(0);
+}
+
+/*
+ * timer without interrupts
+ */
+void reset_timer (void)
+{
+	reset_timer_masked ();
+}
+
+ulong get_timer (ulong base)
+{
+	return get_timer_masked () - base;
+}
+
+void set_timer (ulong t)
+{
+	timestamp = t;
+}
+
+/* delay x useconds AND perserve advance timstamp value */
+void udelay (unsigned long usec)
+{
+	ulong tmo, tmp;
+
+	if (usec >= 1000) {			/* if "big" number, spread normalization to seconds */
+		tmo = usec / 1000;		/* start to normalize for usec to ticks per sec */
+		tmo *= CFG_HZ;			/* find number of "ticks" to wait to achieve target */
+		tmo /= 1000;			/* finish normalize. */
+	} else {					/* else small number, don't kill it prior to HZ multiply */
+		tmo = usec * CFG_HZ;
+		tmo /= (1000*1000);
+	}
+
+	tmp = get_timer (0);		/* get current timestamp */
+	if ( (tmo + tmp + 1) < tmp )/* if setting this forward will roll time stamp */
+		reset_timer_masked ();	/* reset "advancing" timestamp to 0, set lastinc value */
+	else
+		tmo	+= tmp;				/* else, set advancing stamp wake up time */
+	while (get_timer_masked () < tmo)/* loop till event */
+		/*NOP*/;
+}
+
+void reset_timer_masked (void)
+{
+	/* reset time */
+	lastinc = READ_TIMER;		/* capture current incrementer value time */
+	timestamp = 0;				/* start "advancing" time stamp from 0 */
+}
+
+ulong get_timer_masked (void)
+{
+	ulong now = READ_TIMER;		/* current tick value */
+
+	if (now >= lastinc)			/* normal mode (non roll) */
+		timestamp += (now - lastinc); /* move stamp fordward with absoulte diff ticks */
+	else						/* we have rollover of incrementer */
+		timestamp += (0xFFFFFFFF - lastinc) + now;
+	lastinc = now;
+	return timestamp;
+}
+
+/* waits specified delay value and resets timestamp */
+void udelay_masked (unsigned long usec)
+{
+	ulong tmo;
+
+	if (usec >= 1000) {			/* if "big" number, spread normalization to seconds */
+		tmo = usec / 1000;		/* start to normalize for usec to ticks per sec */
+		tmo *= CFG_HZ;			/* find number of "ticks" to wait to achieve target */
+		tmo /= 1000;			/* finish normalize. */
+	} else {					/* else small number, don't kill it prior to HZ multiply */
+		tmo = usec * CFG_HZ;
+		tmo /= (1000*1000);
+	}
+	reset_timer_masked ();		/* set "advancing" timestamp to 0, set lastinc vaule */
+	while (get_timer_masked () < tmo) /* wait for time stamp to overtake tick number.*/
+		/* NOP */;
+}
+
+/*
+ * This function is derived from PowerPC code (read timebase as long long).
+ * On ARM 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 ARM it returns the number of timer ticks per second.
+ */
+ulong get_tbclk (void)
+{
+	ulong tbclk;
+	tbclk = CFG_HZ;
+	return tbclk;
+}