target/linux/brcm47xx/files-2.6.25/arch/mips/bcm947xx/irq.c

   1 /*
   2  *  Copyright (C) 2004 Florian Schirmer (jolt@tuxbox.org)
   3  *  Copyright (C) 2008 Michael Buesch <mb@bu3sch.de>
   4  *
   5  *  This program is free software; you can redistribute  it and/or modify it
   6  *  under  the terms of  the GNU General  Public License as published by the
   7  *  Free Software Foundation;  either version 2 of the  License, or (at your
   8  *  option) any later version.
   9  *
  10  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  11  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  12  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  13  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  14  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  15  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  16  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  17  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  18  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  19  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  20  *
  21  *  You should have received a copy of the  GNU General Public License along
  22  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  23  *  675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/irq.h>
  30 #include <linux/module.h>
  31 #include <linux/smp.h>
  32 #include <linux/types.h>
  33 #include <linux/pci.h>
  34 #include <linux/ssb/ssb.h>
  35
  36 #include <asm/cpu.h>
  37 #include <asm/io.h>
  38 #include <asm/irq.h>
  39 #include <asm/irq_cpu.h>
  40
  41
  42 extern struct ssb_bus ssb;
  43
  44
  45 void plat_irq_dispatch(void)
  46 {
  47         u32 cause;
  48
  49         cause = read_c0_cause() & read_c0_status() & CAUSEF_IP;
  50
  51         clear_c0_status(cause);
  52
  53         if (cause & CAUSEF_IP7)
  54                 do_IRQ(7);
  55         if (cause & CAUSEF_IP2)
  56                 do_IRQ(2);
  57         if (cause & CAUSEF_IP3)
  58                 do_IRQ(3);
  59         if (cause & CAUSEF_IP4)
  60                 do_IRQ(4);
  61         if (cause & CAUSEF_IP5)
  62                 do_IRQ(5);
  63         if (cause & CAUSEF_IP6)
  64                 do_IRQ(6);
  65 }
  66
  67 void __init arch_init_irq(void)
  68 {
  69         mips_cpu_irq_init();
  70 }
  71
  72 int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  73 {
  74         int res;
  75
  76         res = ssb_pcibios_map_irq(dev, slot, pin);
  77         if (res < 0) {
  78                 printk(KERN_ALERT "PCI: Failed to map IRQ of device %s\n",
  79                        dev->dev.bus_id);
  80                 return 0;
  81         }
  82         /* IRQ-0 and IRQ-1 are software interrupts. */
  83         WARN_ON((res == 0) || (res == 1));
  84
  85         return res;
  86 }