mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 10:04:12 +08:00
6a01f23033
[Mike Frysinger <vapier.adi@gmail.com>: - handle bf531/bf532/bf534/bf536 variants in ipipe.h - cleanup IPIPE logic for bfin_set_irq_handler() - cleanup ipipe asm code a bit and add missing ENDPROC() - simplify IPIPE code in trap_c - unify some of the IPIPE code and fix style - simplify DO_IRQ_L1 handling with ipipe code - revert IRQ_SW_INT# addition from ipipe merge - remove duplicate get_{c,s}clk() prototypes ] Signed-off-by: Yi Li <yi.li@analog.com> Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
177 lines
4.6 KiB
C
177 lines
4.6 KiB
C
/*
|
|
* File: arch/blackfin/kernel/irqchip.c
|
|
* Based on:
|
|
* Author:
|
|
*
|
|
* Created:
|
|
* Description: This file contains the simple DMA Implementation for Blackfin
|
|
*
|
|
* Modified:
|
|
* Copyright 2004-2006 Analog Devices Inc.
|
|
*
|
|
* Bugs: Enter bugs at http://blackfin.uclinux.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 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, see the file COPYING, or write
|
|
* to the Free Software Foundation, Inc.,
|
|
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/module.h>
|
|
#include <linux/random.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
#include <asm/trace.h>
|
|
|
|
static atomic_t irq_err_count;
|
|
static spinlock_t irq_controller_lock;
|
|
|
|
/*
|
|
* Dummy mask/unmask handler
|
|
*/
|
|
void dummy_mask_unmask_irq(unsigned int irq)
|
|
{
|
|
}
|
|
|
|
void ack_bad_irq(unsigned int irq)
|
|
{
|
|
atomic_inc(&irq_err_count);
|
|
printk(KERN_ERR "IRQ: spurious interrupt %d\n", irq);
|
|
}
|
|
|
|
static struct irq_chip bad_chip = {
|
|
.ack = dummy_mask_unmask_irq,
|
|
.mask = dummy_mask_unmask_irq,
|
|
.unmask = dummy_mask_unmask_irq,
|
|
};
|
|
|
|
static struct irq_desc bad_irq_desc = {
|
|
.status = IRQ_DISABLED,
|
|
.chip = &bad_chip,
|
|
.handle_irq = handle_bad_irq,
|
|
.depth = 1,
|
|
.lock = __SPIN_LOCK_UNLOCKED(irq_desc->lock),
|
|
#ifdef CONFIG_SMP
|
|
.affinity = CPU_MASK_ALL
|
|
#endif
|
|
};
|
|
|
|
int show_interrupts(struct seq_file *p, void *v)
|
|
{
|
|
int i = *(loff_t *) v, j;
|
|
struct irqaction *action;
|
|
unsigned long flags;
|
|
|
|
if (i < NR_IRQS) {
|
|
spin_lock_irqsave(&irq_desc[i].lock, flags);
|
|
action = irq_desc[i].action;
|
|
if (!action)
|
|
goto skip;
|
|
seq_printf(p, "%3d: ", i);
|
|
for_each_online_cpu(j)
|
|
seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
|
|
seq_printf(p, " %8s", irq_desc[i].chip->name);
|
|
seq_printf(p, " %s", action->name);
|
|
for (action = action->next; action; action = action->next)
|
|
seq_printf(p, " %s", action->name);
|
|
|
|
seq_putc(p, '\n');
|
|
skip:
|
|
spin_unlock_irqrestore(&irq_desc[i].lock, flags);
|
|
} else if (i == NR_IRQS)
|
|
seq_printf(p, "Err: %10u\n", atomic_read(&irq_err_count));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* do_IRQ handles all hardware IRQs. Decoded IRQs should not
|
|
* come via this function. Instead, they should provide their
|
|
* own 'handler'
|
|
*/
|
|
#ifdef CONFIG_DO_IRQ_L1
|
|
__attribute__((l1_text))
|
|
#endif
|
|
asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
|
|
{
|
|
struct pt_regs *old_regs;
|
|
struct irq_desc *desc = irq_desc + irq;
|
|
#ifndef CONFIG_IPIPE
|
|
unsigned short pending, other_ints;
|
|
#endif
|
|
old_regs = set_irq_regs(regs);
|
|
|
|
/*
|
|
* Some hardware gives randomly wrong interrupts. Rather
|
|
* than crashing, do something sensible.
|
|
*/
|
|
if (irq >= NR_IRQS)
|
|
desc = &bad_irq_desc;
|
|
|
|
irq_enter();
|
|
#ifdef CONFIG_DEBUG_STACKOVERFLOW
|
|
/* Debugging check for stack overflow: is there less than STACK_WARN free? */
|
|
{
|
|
long sp;
|
|
|
|
sp = __get_SP() & (THREAD_SIZE-1);
|
|
|
|
if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
|
|
dump_stack();
|
|
printk(KERN_EMERG "%s: possible stack overflow while handling irq %i "
|
|
" only %ld bytes free\n",
|
|
__func__, irq, sp - sizeof(struct thread_info));
|
|
}
|
|
}
|
|
#endif
|
|
generic_handle_irq(irq);
|
|
|
|
#ifndef CONFIG_IPIPE /* Useless and bugous over the I-pipe: IRQs are threaded. */
|
|
/* If we're the only interrupt running (ignoring IRQ15 which is for
|
|
syscalls), lower our priority to IRQ14 so that softirqs run at
|
|
that level. If there's another, lower-level interrupt, irq_exit
|
|
will defer softirqs to that. */
|
|
CSYNC();
|
|
pending = bfin_read_IPEND() & ~0x8000;
|
|
other_ints = pending & (pending - 1);
|
|
if (other_ints == 0)
|
|
lower_to_irq14();
|
|
#endif /* !CONFIG_IPIPE */
|
|
irq_exit();
|
|
|
|
set_irq_regs(old_regs);
|
|
}
|
|
|
|
void __init init_IRQ(void)
|
|
{
|
|
struct irq_desc *desc;
|
|
int irq;
|
|
|
|
spin_lock_init(&irq_controller_lock);
|
|
for (irq = 0, desc = irq_desc; irq < NR_IRQS; irq++, desc++) {
|
|
*desc = bad_irq_desc;
|
|
}
|
|
|
|
init_arch_irq();
|
|
|
|
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
|
|
/* Now that evt_ivhw is set up, turn this on */
|
|
trace_buff_offset = 0;
|
|
bfin_write_TBUFCTL(BFIN_TRACE_ON);
|
|
printk(KERN_INFO "Hardware Trace expanded to %ik\n",
|
|
1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN);
|
|
#endif
|
|
}
|