arch/sh/boards/mach-se/7343/irq.c

   1 /*
   2  * linux/arch/sh/boards/se/7343/irq.c
   3  *
   4  * Copyright (C) 2008  Yoshihiro Shimoda
   5  *
   6  * Based on linux/arch/sh/boards/se/7722/irq.c
   7  * Copyright (C) 2007  Nobuhiro Iwamatsu
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file "COPYING" in the main directory of this archive
  11  * for more details.
  12  */
  13 #include <linux/init.h>
  14 #include <linux/irq.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/io.h>
  17 #include <mach-se/mach/se7343.h>
  18
  19 unsigned int se7343_fpga_irq[SE7343_FPGA_IRQ_NR] = { 0, };
  20
  21 static void disable_se7343_irq(struct irq_data *data)
  22 {
  23         unsigned int bit = (unsigned int)irq_data_get_irq_chip_data(data);
  24         __raw_writew(__raw_readw(PA_CPLD_IMSK) | 1 << bit, PA_CPLD_IMSK);
  25 }
  26
  27 static void enable_se7343_irq(struct irq_data *data)
  28 {
  29         unsigned int bit = (unsigned int)irq_data_get_irq_chip_data(data);
  30         __raw_writew(__raw_readw(PA_CPLD_IMSK) & ~(1 << bit), PA_CPLD_IMSK);
  31 }
  32
  33 static struct irq_chip se7343_irq_chip __read_mostly = {
  34         .name           = "SE7343-FPGA",
  35         .irq_mask       = disable_se7343_irq,
  36         .irq_unmask     = enable_se7343_irq,
  37 };
  38
  39 static void se7343_irq_demux(unsigned int irq, struct irq_desc *desc)
  40 {
  41         unsigned short intv = __raw_readw(PA_CPLD_ST);
  42         unsigned int ext_irq = 0;
  43
  44         intv &= (1 << SE7343_FPGA_IRQ_NR) - 1;
  45
  46         for (; intv; intv >>= 1, ext_irq++) {
  47                 if (!(intv & 1))
  48                         continue;
  49
  50                 generic_handle_irq(se7343_fpga_irq[ext_irq]);
  51         }
  52 }
  53
  54 /*
  55  * Initialize IRQ setting
  56  */
  57 void __init init_7343se_IRQ(void)
  58 {
  59         int i, irq;
  60
  61         __raw_writew(0, PA_CPLD_IMSK);  /* disable all irqs */
  62         __raw_writew(0x2000, 0xb03fffec);       /* mrshpc irq enable */
  63
  64         for (i = 0; i < SE7343_FPGA_IRQ_NR; i++) {
  65                 irq = create_irq();
  66                 if (irq < 0)
  67                         return;
  68                 se7343_fpga_irq[i] = irq;
  69
  70                 irq_set_chip_and_handler_name(se7343_fpga_irq[i],
  71                                               &se7343_irq_chip,
  72                                               handle_level_irq,
  73                                               "level");
  74
  75                 irq_set_chip_data(se7343_fpga_irq[i], (void *)i);
  76         }
  77
  78         irq_set_chained_handler(IRQ0_IRQ, se7343_irq_demux);
  79         irq_set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW);
  80         irq_set_chained_handler(IRQ1_IRQ, se7343_irq_demux);
  81         irq_set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW);
  82         irq_set_chained_handler(IRQ4_IRQ, se7343_irq_demux);
  83         irq_set_irq_type(IRQ4_IRQ, IRQ_TYPE_LEVEL_LOW);
  84         irq_set_chained_handler(IRQ5_IRQ, se7343_irq_demux);
  85         irq_set_irq_type(IRQ5_IRQ, IRQ_TYPE_LEVEL_LOW);
  86 }