arch/sh/boards/mach-se/7722/irq.c

   1 /*
   2  * linux/arch/sh/boards/se/7722/irq.c
   3  *
   4  * Copyright (C) 2007  Nobuhiro Iwamatsu
   5  *
   6  * Hitachi UL SolutionEngine 7722 Support.
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License.  See the file "COPYING" in the main directory of this archive
  10  * for more details.
  11  */
  12 #include <linux/init.h>
  13 #include <linux/irq.h>
  14 #include <linux/interrupt.h>
  15 #include <asm/irq.h>
  16 #include <asm/io.h>
  17 #include <mach-se/mach/se7722.h>
  18
  19 unsigned int se7722_fpga_irq[SE7722_FPGA_IRQ_NR] = { 0, };
  20
  21 static void disable_se7722_irq(struct irq_data *data)
  22 {
  23         unsigned int bit = (unsigned int)irq_data_get_irq_chip_data(data);
  24         __raw_writew(__raw_readw(IRQ01_MASK) | 1 << bit, IRQ01_MASK);
  25 }
  26
  27 static void enable_se7722_irq(struct irq_data *data)
  28 {
  29         unsigned int bit = (unsigned int)irq_data_get_irq_chip_data(data);
  30         __raw_writew(__raw_readw(IRQ01_MASK) & ~(1 << bit), IRQ01_MASK);
  31 }
  32
  33 static struct irq_chip se7722_irq_chip __read_mostly = {
  34         .name           = "SE7722-FPGA",
  35         .irq_mask       = disable_se7722_irq,
  36         .irq_unmask     = enable_se7722_irq,
  37 };
  38
  39 static void se7722_irq_demux(unsigned int irq, struct irq_desc *desc)
  40 {
  41         unsigned short intv = __raw_readw(IRQ01_STS);
  42         unsigned int ext_irq = 0;
  43
  44         intv &= (1 << SE7722_FPGA_IRQ_NR) - 1;
  45
  46         for (; intv; intv >>= 1, ext_irq++) {
  47                 if (!(intv & 1))
  48                         continue;
  49
  50                 generic_handle_irq(se7722_fpga_irq[ext_irq]);
  51         }
  52 }
  53
  54 /*
  55  * Initialize IRQ setting
  56  */
  57 void __init init_se7722_IRQ(void)
  58 {
  59         int i, irq;
  60
  61         __raw_writew(0, IRQ01_MASK);       /* disable all irqs */
  62         __raw_writew(0x2000, 0xb03fffec);  /* mrshpc irq enable */
  63
  64         for (i = 0; i < SE7722_FPGA_IRQ_NR; i++) {
  65                 irq = create_irq();
  66                 if (irq < 0)
  67                         return;
  68                 se7722_fpga_irq[i] = irq;
  69
  70                 set_irq_chip_and_handler_name(se7722_fpga_irq[i],
  71                                               &se7722_irq_chip,
  72                                               handle_level_irq, "level");
  73
  74                 set_irq_chip_data(se7722_fpga_irq[i], (void *)i);
  75         }
  76
  77         set_irq_chained_handler(IRQ0_IRQ, se7722_irq_demux);
  78         set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW);
  79
  80         set_irq_chained_handler(IRQ1_IRQ, se7722_irq_demux);
  81         set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW);
  82 }