patch-2.4.25 linux-2.4.25/arch/mips/momentum/jaguar_atx/irq.c

• Lines: 211
• Date: 2004-02-18 05:36:30.000000000 -0800
• Orig file: linux-2.4.24/arch/mips/momentum/jaguar_atx/irq.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.24/arch/mips/momentum/jaguar_atx/irq.c linux-2.4.25/arch/mips/momentum/jaguar_atx/irq.c
@@ -0,0 +1,210 @@
+/*
+ * Copyright (C) 2002 Momentum Computer, Inc.
+ * Author: Matthew Dharm, mdharm@momenco.com
+ *
+ * Based on work by:
+ *   Copyright (C) 2000 RidgeRun, Inc.
+ *   Author: RidgeRun, Inc.
+ *   glonnon@ridgerun.com, skranz@ridgerun.com, stevej@ridgerun.com
+ *
+ *   Copyright 2001 MontaVista Software Inc.
+ *   Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
+ *
+ *   Copyright (C) 2000, 2001 Ralf Baechle (ralf@gnu.org)
+ *
+ *  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  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
+ *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
+ *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
+ *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  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.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel_stat.h>
+#include <linux/module.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/timex.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <asm/bitops.h>
+#include <asm/bootinfo.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/mipsregs.h>
+#include <asm/system.h>
+
+#define read_32bit_cp0_set1_register(source)                    \
+({ int __res;                                                   \
+        __asm__ __volatile__(                                   \
+	".set\tpush\n\t"					\
+	".set\treorder\n\t"					\
+        "cfc0\t%0,"STR(source)"\n\t"                            \
+	".set\tpop"						\
+        : "=r" (__res));                                        \
+        __res;})
+
+#define write_32bit_cp0_set1_register(register,value)           \
+        __asm__ __volatile__(                                   \
+        "ctc0\t%0,"STR(register)"\n\t"				\
+	"nop"							\
+        : : "r" (value));
+
+static spinlock_t irq_lock = SPIN_LOCK_UNLOCKED;
+
+/* Function for careful CP0 interrupt mask access */
+static inline void modify_cp0_intmask(unsigned clr_mask_in, unsigned set_mask_in)
+{
+	unsigned long status;
+	unsigned clr_mask;
+	unsigned set_mask;
+
+	/* do the low 8 bits first */
+	clr_mask = 0xff & clr_mask_in;
+	set_mask = 0xff & set_mask_in;
+	status = read_c0_status();
+	status &= ~((clr_mask & 0xFF) << 8);
+	status |= (set_mask & 0xFF) << 8;
+	write_c0_status(status);
+
+	/* do the high 8 bits */
+	clr_mask = 0xff & (clr_mask_in >> 8);
+	set_mask = 0xff & (set_mask_in >> 8);
+	status = read_32bit_cp0_set1_register(CP0_S1_INTCONTROL);
+	status &= ~((clr_mask & 0xFF) << 8);
+	status |= (set_mask & 0xFF) << 8;
+	write_32bit_cp0_set1_register(CP0_S1_INTCONTROL, status);
+}
+
+static inline void mask_irq(unsigned int irq)
+{
+	modify_cp0_intmask(irq, 0);
+}
+
+static inline void unmask_irq(unsigned int irq)
+{
+	modify_cp0_intmask(0, irq);
+}
+
+static void enable_rm9000_irq(unsigned int irq)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&irq_lock, flags);
+	unmask_irq(1 << (irq-1));
+	spin_unlock_irqrestore(&irq_lock, flags);
+}
+
+static unsigned int startup_rm9000_irq(unsigned int irq)
+{
+	enable_rm9000_irq(irq);
+
+	return 0;				/* never anything pending */
+}
+
+static void disable_rm9000_irq(unsigned int irq)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&irq_lock, flags);
+	mask_irq(1 << (irq-1));
+	spin_unlock_irqrestore(&irq_lock, flags);
+}
+
+#define shutdown_rm9000_irq disable_rm9000_irq
+
+static void mask_and_ack_rm9000_irq(unsigned int irq)
+{
+	mask_irq(1 << (irq-1));
+}
+
+static void end_rm9000_irq(unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+		unmask_irq(1 << (irq-1));
+}
+
+static struct hw_interrupt_type rm9000_hpcdma_irq_type = {
+	"RM9000",
+	startup_rm9000_irq,
+	shutdown_rm9000_irq,
+	enable_rm9000_irq,
+	disable_rm9000_irq,
+	mask_and_ack_rm9000_irq,
+	end_rm9000_irq,
+	NULL
+};
+
+extern void wired_reset(void);
+extern void PMON_v2_setup(void);
+extern asmlinkage void jaguar_handle_int(void);
+extern void mv64340_irq_init(void);
+
+static struct irqaction cascade_mv64340 =
+	{ no_action, SA_INTERRUPT, 0, "cascade via MV64340", NULL, NULL };
+static struct irqaction unused_irq =
+	{ no_action, SA_INTERRUPT, 0, "unused", NULL, NULL };
+
+void __init init_IRQ(void)
+{
+	int i;
+
+	/*
+	 * Clear all of the interrupts while we change the able around a bit.
+	 * int-handler is not on bootstrap
+	 */
+	clear_c0_status(ST0_IM | ST0_BEV);
+	__cli();
+
+	/* Sets the first-level interrupt dispatcher. */
+	set_except_vector(0, jaguar_handle_int);
+	init_generic_irq();
+
+	/* set up handler for first 12 IRQs as the CPU */
+	for (i = 0; i < 13; i++) {
+		irq_desc[i].status	= IRQ_DISABLED;
+		irq_desc[i].action	= 0;
+		irq_desc[i].depth	= 1;
+		irq_desc[i].handler	= &rm9000_hpcdma_irq_type;
+	}
+
+	/* set up the cascading interrupts */
+	setup_irq(9, &cascade_mv64340);
+
+	/* mark unconnected IRQs as unconnected */
+	setup_irq(10, &unused_irq);
+
+	/* mark un-used IRQ numbers as unconnected */
+	setup_irq(13, &unused_irq);
+	setup_irq(14, &unused_irq);
+	setup_irq(15, &unused_irq);
+
+	mv64340_irq_init();
+
+#ifdef CONFIG_REMOTE_DEBUG
+	printk("start kgdb ...\n");
+	set_debug_traps();
+	breakpoint();	/* you may move this line to whereever you want :-) */
+#endif
+#ifdef CONFIG_GDB_CONSOLE
+	register_gdb_console();
+#endif
+
+}