irq.c
上传用户:lgb322
上传日期:2013-02-24
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文件大小:5k
- /*
- * 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 <linux/irq.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>
- static spinlock_t rm7000_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_32bit_cp0_register(CP0_STATUS);
- status &= ~((clr_mask & 0xFF) << 8);
- status |= (set_mask & 0xFF) << 8;
- write_32bit_cp0_register(CP0_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_cp7000_irq(unsigned int irq)
- {
- unsigned long flags;
- spin_lock_irqsave(&rm7000_irq_lock, flags);
- unmask_irq(1 << irq);
- spin_unlock_irqrestore(&rm7000_irq_lock, flags);
- }
- static unsigned int startup_cp7000_irq(unsigned int irq)
- {
- enable_cp7000_irq(irq);
- return 0; /* never anything pending */
- }
- static void disable_cp7000_irq(unsigned int irq)
- {
- unsigned long flags;
- spin_lock_irqsave(&rm7000_irq_lock, flags);
- mask_irq(1 << irq);
- spin_unlock_irqrestore(&rm7000_irq_lock, flags);
- }
- #define shutdown_cp7000_irq disable_cp7000_irq
- static void mask_and_ack_cp7000_irq(unsigned int irq)
- {
- mask_irq(1 << irq);
- }
- static void end_cp7000_irq(unsigned int irq)
- {
- if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
- unmask_irq(1 << irq);
- }
- static struct hw_interrupt_type cp7000_hpcdma_irq_type = {
- "CP7000",
- startup_cp7000_irq,
- shutdown_cp7000_irq,
- enable_cp7000_irq,
- disable_cp7000_irq,
- mask_and_ack_cp7000_irq,
- end_cp7000_irq,
- NULL
- };
- extern asmlinkage void ocelot_handle_int(void);
- extern void gt64120_irq_init(void);
- 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_cp0_status(ST0_IM | ST0_BEV);
- __cli();
- /* Sets the first-level interrupt dispatcher. */
- set_except_vector(0, ocelot_handle_int);
- init_generic_irq();
- for (i = 0; i <= 15; i++) {
- irq_desc[i].status = IRQ_DISABLED;
- irq_desc[i].action = 0;
- irq_desc[i].depth = 1;
- irq_desc[i].handler = &cp7000_hpcdma_irq_type;
- }
- gt64120_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
- }