arch/mips/bcm47xx/irq.c

   1 /*
   2  *  Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org>
   3  *
   4  *  This program is free software; you can redistribute  it and/or modify it
   5  *  under  the terms of  the GNU General  Public License as published by the
   6  *  Free Software Foundation;  either version 2 of the  License, or (at your
   7  *  option) any later version.
   8  *
   9  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  10  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  11  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  12  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  13  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  14  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  15  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  16  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  17  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  18  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  19  *
  20  *  You should have received a copy of the  GNU General Public License along
  21  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  22  *  675 Mass Ave, Cambridge, MA 02139, USA.
  23  */
  24
  25 #include "bcm47xx_private.h"
  26
  27 #include <linux/types.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/irq.h>
  30 #include <asm/setup.h>
  31 #include <asm/irq_cpu.h>
  32 #include <bcm47xx.h>
  33
  34 asmlinkage void plat_irq_dispatch(void)
  35 {
  36         u32 cause;
  37
  38         cause = read_c0_cause() & read_c0_status() & CAUSEF_IP;
  39
  40         clear_c0_status(cause);
  41
  42         if (cause & CAUSEF_IP7)
  43                 do_IRQ(7);
  44         if (cause & CAUSEF_IP2)
  45                 do_IRQ(2);
  46         if (cause & CAUSEF_IP3)
  47                 do_IRQ(3);
  48         if (cause & CAUSEF_IP4)
  49                 do_IRQ(4);
  50         if (cause & CAUSEF_IP5)
  51                 do_IRQ(5);
  52         if (cause & CAUSEF_IP6)
  53                 do_IRQ(6);
  54 }
  55
  56 #define DEFINE_HWx_IRQDISPATCH(x)                                       \
  57         static void bcm47xx_hw ## x ## _irqdispatch(void)               \
  58         {                                                               \
  59                 do_IRQ(x);                                              \
  60         }
  61 DEFINE_HWx_IRQDISPATCH(2)
  62 DEFINE_HWx_IRQDISPATCH(3)
  63 DEFINE_HWx_IRQDISPATCH(4)
  64 DEFINE_HWx_IRQDISPATCH(5)
  65 DEFINE_HWx_IRQDISPATCH(6)
  66 DEFINE_HWx_IRQDISPATCH(7)
  67
  68 void __init arch_init_irq(void)
  69 {
  70         /*
  71          * This is the first arch callback after mm_init (we can use kmalloc),
  72          * so let's finish bus initialization now.
  73          */
  74         bcm47xx_bus_setup();
  75
  76 #ifdef CONFIG_BCM47XX_BCMA
  77         if (bcm47xx_bus_type == BCM47XX_BUS_TYPE_BCMA) {
  78                 bcma_write32(bcm47xx_bus.bcma.bus.drv_mips.core,
  79                              BCMA_MIPS_MIPS74K_INTMASK(5), 1 << 31);
  80                 /*
  81                  * the kernel reads the timer irq from some register and thinks
  82                  * it's #5, but we offset it by 2 and route to #7
  83                  */
  84                 cp0_compare_irq = 7;
  85         }
  86 #endif
  87         mips_cpu_irq_init();
  88
  89         if (cpu_has_vint) {
  90                 pr_info("Setting up vectored interrupts\n");
  91                 set_vi_handler(2, bcm47xx_hw2_irqdispatch);
  92                 set_vi_handler(3, bcm47xx_hw3_irqdispatch);
  93                 set_vi_handler(4, bcm47xx_hw4_irqdispatch);
  94                 set_vi_handler(5, bcm47xx_hw5_irqdispatch);
  95                 set_vi_handler(6, bcm47xx_hw6_irqdispatch);
  96                 set_vi_handler(7, bcm47xx_hw7_irqdispatch);
  97         }
  98 }