arch/score/kernel/irq.c

   1 /*
   2  * arch/score/kernel/irq.c
   3  *
   4  * Score Processor version.
   5  *
   6  * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
   7  *  Chen Liqin <liqin.chen@sunplusct.com>
   8  *  Lennox Wu <lennox.wu@sunplusct.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, see the file COPYING, or write
  22  * to the Free Software Foundation, Inc.,
  23  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  24  */
  25
  26 #include <linux/interrupt.h>
  27 #include <linux/kernel_stat.h>
  28 #include <linux/seq_file.h>
  29
  30 #include <asm/io.h>
  31
  32 /*
  33  * handles all normal device IRQs
  34  */
  35 asmlinkage void do_IRQ(int irq)
  36 {
  37         irq_enter();
  38         generic_handle_irq(irq);
  39         irq_exit();
  40 }
  41
  42 static void score_mask(unsigned int irq_nr)
  43 {
  44         unsigned int irq_source = 63 - irq_nr;
  45
  46         if (irq_source < 32)
  47                 __raw_writel((__raw_readl((void *)P_INT_MASKL) | \
  48                         (1 << irq_source)), (void *)P_INT_MASKL);
  49         else
  50                 __raw_writel((__raw_readl((void *)P_INT_MASKH) | \
  51                         (1 << (irq_source - 32))), (void *)P_INT_MASKH);
  52 }
  53
  54 static void score_unmask(unsigned int irq_nr)
  55 {
  56         unsigned int irq_source = 63 - irq_nr;
  57
  58         if (irq_source < 32)
  59                 __raw_writel((__raw_readl((void *)P_INT_MASKL) & \
  60                         ~(1 << irq_source)), (void *)P_INT_MASKL);
  61         else
  62                 __raw_writel((__raw_readl((void *)P_INT_MASKH) & \
  63                         ~(1 << (irq_source - 32))), (void *)P_INT_MASKH);
  64 }
  65
  66 struct irq_chip score_irq_chip = {
  67         .name           = "Score7-level",
  68         .mask           = score_mask,
  69         .mask_ack       = score_mask,
  70         .unmask         = score_unmask,
  71 };
  72
  73 /*
  74  * initialise the interrupt system
  75  */
  76 void __init init_IRQ(void)
  77 {
  78         int index;
  79         unsigned long target_addr;
  80
  81         for (index = 0; index < NR_IRQS; ++index)
  82                 set_irq_chip_and_handler(index, &score_irq_chip,
  83                                          handle_level_irq);
  84
  85         for (target_addr = IRQ_VECTOR_BASE_ADDR;
  86                 target_addr <= IRQ_VECTOR_END_ADDR;
  87                 target_addr += IRQ_VECTOR_SIZE)
  88                 memcpy((void *)target_addr, \
  89                         interrupt_exception_vector, IRQ_VECTOR_SIZE);
  90
  91         __raw_writel(0xffffffff, (void *)P_INT_MASKL);
  92         __raw_writel(0xffffffff, (void *)P_INT_MASKH);
  93
  94         __asm__ __volatile__(
  95                 "mtcr   %0, cr3\n\t"
  96                 : : "r" (EXCEPTION_VECTOR_BASE_ADDR | \
  97                         VECTOR_ADDRESS_OFFSET_MODE16));
  98 }
  99
 100 /*
 101  * Generic, controller-independent functions:
 102  */
 103 int show_interrupts(struct seq_file *p, void *v)
 104 {
 105         int i = *(loff_t *)v, cpu;
 106         struct irqaction *action;
 107         unsigned long flags;
 108
 109         if (i == 0) {
 110                 seq_puts(p, "           ");
 111                 for_each_online_cpu(cpu)
 112                         seq_printf(p, "CPU%d       ", cpu);
 113                 seq_putc(p, '\n');
 114         }
 115
 116         if (i < NR_IRQS) {
 117                 spin_lock_irqsave(&irq_desc[i].lock, flags);
 118                 action = irq_desc[i].action;
 119                 if (!action)
 120                         goto unlock;
 121
 122                 seq_printf(p, "%3d: ", i);
 123                 seq_printf(p, "%10u ", kstat_irqs(i));
 124                 seq_printf(p, " %8s", irq_desc[i].chip->name ? : "-");
 125                 seq_printf(p, "  %s", action->name);
 126                 for (action = action->next; action; action = action->next)
 127                         seq_printf(p, ", %s", action->name);
 128
 129                 seq_putc(p, '\n');
 130 unlock:
 131                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
 132         }
 133
 134         return 0;
 135 }