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 /* the interrupt controller is hardcoded at this address */
  33 #define SCORE_PIC               ((u32 __iomem __force *)0x95F50000)
  34
  35 #define INT_PNDL                0
  36 #define INT_PNDH                1
  37 #define INT_PRIORITY_M          2
  38 #define INT_PRIORITY_SG0        4
  39 #define INT_PRIORITY_SG1        5
  40 #define INT_PRIORITY_SG2        6
  41 #define INT_PRIORITY_SG3        7
  42 #define INT_MASKL               8
  43 #define INT_MASKH               9
  44
  45 /*
  46  * handles all normal device IRQs
  47  */
  48 asmlinkage void do_IRQ(int irq)
  49 {
  50         irq_enter();
  51         generic_handle_irq(irq);
  52         irq_exit();
  53 }
  54
  55 static void score_mask(struct irq_data *d)
  56 {
  57         unsigned int irq_source = 63 - d->irq;
  58
  59         if (irq_source < 32)
  60                 __raw_writel((__raw_readl(SCORE_PIC + INT_MASKL) | \
  61                         (1 << irq_source)), SCORE_PIC + INT_MASKL);
  62         else
  63                 __raw_writel((__raw_readl(SCORE_PIC + INT_MASKH) | \
  64                         (1 << (irq_source - 32))), SCORE_PIC + INT_MASKH);
  65 }
  66
  67 static void score_unmask(struct irq_data *d)
  68 {
  69         unsigned int irq_source = 63 - d->irq;
  70
  71         if (irq_source < 32)
  72                 __raw_writel((__raw_readl(SCORE_PIC + INT_MASKL) & \
  73                         ~(1 << irq_source)), SCORE_PIC + INT_MASKL);
  74         else
  75                 __raw_writel((__raw_readl(SCORE_PIC + INT_MASKH) & \
  76                         ~(1 << (irq_source - 32))), SCORE_PIC + INT_MASKH);
  77 }
  78
  79 struct irq_chip score_irq_chip = {
  80         .name           = "Score7-level",
  81         .irq_mask       = score_mask,
  82         .irq_mask_ack   = score_mask,
  83         .irq_unmask     = score_unmask,
  84 };
  85
  86 /*
  87  * initialise the interrupt system
  88  */
  89 void __init init_IRQ(void)
  90 {
  91         int index;
  92         unsigned long target_addr;
  93
  94         for (index = 0; index < NR_IRQS; ++index)
  95                 irq_set_chip_and_handler(index, &score_irq_chip,
  96                                          handle_level_irq);
  97
  98         for (target_addr = IRQ_VECTOR_BASE_ADDR;
  99                 target_addr <= IRQ_VECTOR_END_ADDR;
 100                 target_addr += IRQ_VECTOR_SIZE)
 101                 memcpy((void *)target_addr, \
 102                         interrupt_exception_vector, IRQ_VECTOR_SIZE);
 103
 104         __raw_writel(0xffffffff, SCORE_PIC + INT_MASKL);
 105         __raw_writel(0xffffffff, SCORE_PIC + INT_MASKH);
 106
 107         __asm__ __volatile__(
 108                 "mtcr   %0, cr3\n\t"
 109                 : : "r" (EXCEPTION_VECTOR_BASE_ADDR | \
 110                         VECTOR_ADDRESS_OFFSET_MODE16));
 111 }