| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/mips/tx4927/common/tx4927_irq_handler.S |
| 3 | * |
| 4 | * Primary interrupt handler for tx4927 based systems |
| 5 | * |
| 6 | * Author: MontaVista Software, Inc. |
| 7 | * Author: jsun@mvista.com or jsun@junsun.net |
| 8 | * source@mvista.com |
| 9 | * |
| 10 | * Copyright 2001-2002 MontaVista Software Inc. |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify it |
| 13 | * under the terms of the GNU General Public License as published by the |
| 14 | * Free Software Foundation; either version 2 of the License, or (at your |
| 15 | * option) any later version. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 19 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 22 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| 23 | * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| 24 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR |
| 25 | * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE |
| 26 | * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | * |
| 28 | * You should have received a copy of the GNU General Public License along |
| 29 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 30 | * 675 Mass Ave, Cambridge, MA 02139, USA. |
| 31 | */ |
| 32 | #include <asm/asm.h> |
| 33 | #include <asm/mipsregs.h> |
| 34 | #include <asm/addrspace.h> |
| 35 | #include <asm/regdef.h> |
| 36 | #include <asm/stackframe.h> |
| 37 | #include <asm/tx4927/tx4927.h> |
| 38 | |
| 39 | .align 5 |
| 40 | NESTED(tx4927_irq_handler, PT_SIZE, sp) |
| 41 | SAVE_ALL |
| 42 | CLI |
| 43 | .set at |
| 44 | |
| Ralf Baechle | 42a3b4f | 2005-09-03 15:56:17 -0700 | [diff] [blame] | 45 | mfc0 t0, CP0_CAUSE |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | mfc0 t1, CP0_STATUS |
| 47 | and t0, t1 |
| Ralf Baechle | 42a3b4f | 2005-09-03 15:56:17 -0700 | [diff] [blame] | 48 | |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | andi t1, t0, STATUSF_IP7 /* cpu timer */ |
| 50 | bnez t1, ll_ip7 |
| Ralf Baechle | 42a3b4f | 2005-09-03 15:56:17 -0700 | [diff] [blame] | 51 | |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | /* IP6..IP3 multiplexed -- do not use */ |
| 53 | |
| 54 | andi t1, t0, STATUSF_IP2 /* tx4927 pic */ |
| 55 | bnez t1, ll_ip2 |
| 56 | |
| 57 | andi t1, t0, STATUSF_IP0 /* user line 0 */ |
| 58 | bnez t1, ll_ip0 |
| 59 | |
| 60 | andi t1, t0, STATUSF_IP1 /* user line 1 */ |
| 61 | bnez t1, ll_ip1 |
| 62 | |
| 63 | .set reorder |
| 64 | |
| 65 | /* wrong alarm or masked ... */ |
| 66 | j spurious_interrupt |
| 67 | nop |
| 68 | END(tx4927_irq_handler) |
| 69 | |
| 70 | .align 5 |
| 71 | |
| 72 | |
| 73 | ll_ip7: |
| 74 | li a0, TX4927_IRQ_CPU_TIMER |
| 75 | move a1, sp |
| 76 | jal do_IRQ |
| 77 | j ret_from_irq |
| 78 | |
| 79 | ll_ip2: |
| 80 | jal tx4927_irq_nested |
| 81 | nop |
| 82 | beqz v0, goto_spurious_interrupt |
| 83 | nop |
| 84 | move a0, v0 |
| 85 | move a1, sp |
| 86 | jal do_IRQ |
| 87 | j ret_from_irq |
| 88 | |
| 89 | goto_spurious_interrupt: |
| 90 | j spurious_interrupt |
| 91 | nop |
| 92 | |
| 93 | ll_ip1: |
| 94 | li a0, TX4927_IRQ_USER1 |
| 95 | move a1, sp |
| 96 | jal do_IRQ |
| 97 | j ret_from_irq |
| 98 | |
| 99 | ll_ip0: |
| 100 | li a0, TX4927_IRQ_USER0 |
| 101 | move a1, sp |
| 102 | jal do_IRQ |
| 103 | j ret_from_irq |