Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * BRIEF MODULE DESCRIPTION |
| 3 | * Code to handle irqs on GT64120A boards |
| 4 | * Derived from mips/orion and Cort <cort@fsmlabs.com> |
| 5 | * |
| 6 | * Copyright (C) 2000 RidgeRun, Inc. |
| 7 | * Author: RidgeRun, Inc. |
| 8 | * glonnon@ridgerun.com, skranz@ridgerun.com, stevej@ridgerun.com |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify it |
| 11 | * under the terms of the GNU General Public License as published by the |
| 12 | * Free Software Foundation; either version 2 of the License, or (at your |
| 13 | * option) any later version. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 16 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 17 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN |
| 18 | * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| 21 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
| 22 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 25 | * |
| 26 | * You should have received a copy of the GNU General Public License along |
| 27 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 28 | * 675 Mass Ave, Cambridge, MA 02139, USA. |
| 29 | */ |
| 30 | #include <linux/errno.h> |
| 31 | #include <linux/init.h> |
| 32 | #include <linux/kernel_stat.h> |
| 33 | #include <linux/module.h> |
| 34 | #include <linux/signal.h> |
| 35 | #include <linux/sched.h> |
| 36 | #include <linux/types.h> |
| 37 | #include <linux/interrupt.h> |
| 38 | #include <linux/ioport.h> |
| 39 | #include <linux/timex.h> |
| 40 | #include <linux/slab.h> |
| 41 | #include <linux/random.h> |
| 42 | #include <linux/bitops.h> |
| 43 | #include <asm/bootinfo.h> |
| 44 | #include <asm/io.h> |
| 45 | #include <asm/mipsregs.h> |
| 46 | #include <asm/system.h> |
| 47 | #include <asm/gt64120.h> |
| 48 | |
Ralf Baechle | e4ac58a | 2006-04-03 17:56:36 +0100 | [diff] [blame] | 49 | asmlinkage void plat_irq_dispatch(struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | { |
Ralf Baechle | e4ac58a | 2006-04-03 17:56:36 +0100 | [diff] [blame] | 51 | unsigned int pending = read_c0_status() & read_c0_cause(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
Ralf Baechle | e4ac58a | 2006-04-03 17:56:36 +0100 | [diff] [blame] | 53 | if (pending & STATUSF_IP4) /* int2 hardware line (timer) */ |
| 54 | do_IRQ(4, regs); |
| 55 | else if (pending & STATUSF_IP2) /* int0 hardware line */ |
| 56 | do_IRQ(GT_INTA, regs); |
| 57 | else if (pending & STATUSF_IP5) /* int3 hardware line */ |
| 58 | do_IRQ(GT_INTD, regs); |
| 59 | else if (pending & STATUSF_IP6) /* int4 hardware line */ |
| 60 | do_IRQ(6, regs); |
| 61 | else if (pending & STATUSF_IP7) /* compare int */ |
| 62 | do_IRQ(7, regs); |
| 63 | else |
| 64 | spurious_interrupt(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | } |
| 66 | |
| 67 | static void disable_ev64120_irq(unsigned int irq_nr) |
| 68 | { |
| 69 | unsigned long flags; |
| 70 | |
| 71 | local_irq_save(flags); |
| 72 | if (irq_nr >= 8) { // All PCI interrupts are on line 5 or 2 |
| 73 | clear_c0_status(9 << 10); |
| 74 | } else { |
| 75 | clear_c0_status(1 << (irq_nr + 8)); |
| 76 | } |
| 77 | local_irq_restore(flags); |
| 78 | } |
| 79 | |
| 80 | static void enable_ev64120_irq(unsigned int irq_nr) |
| 81 | { |
| 82 | unsigned long flags; |
| 83 | |
| 84 | local_irq_save(flags); |
| 85 | if (irq_nr >= 8) // All PCI interrupts are on line 5 or 2 |
| 86 | set_c0_status(9 << 10); |
| 87 | else |
| 88 | set_c0_status(1 << (irq_nr + 8)); |
| 89 | local_irq_restore(flags); |
| 90 | } |
| 91 | |
| 92 | static unsigned int startup_ev64120_irq(unsigned int irq) |
| 93 | { |
| 94 | enable_ev64120_irq(irq); |
| 95 | return 0; /* Never anything pending */ |
| 96 | } |
| 97 | |
| 98 | #define shutdown_ev64120_irq disable_ev64120_irq |
| 99 | #define mask_and_ack_ev64120_irq disable_ev64120_irq |
| 100 | |
| 101 | static void end_ev64120_irq(unsigned int irq) |
| 102 | { |
| 103 | if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) |
| 104 | enable_ev64120_irq(irq); |
| 105 | } |
| 106 | |
| 107 | static struct hw_interrupt_type ev64120_irq_type = { |
| 108 | .typename = "EV64120", |
| 109 | .startup = startup_ev64120_irq, |
| 110 | .shutdown = shutdown_ev64120_irq, |
| 111 | .enable = enable_ev64120_irq, |
| 112 | .disable = disable_ev64120_irq, |
| 113 | .ack = mask_and_ack_ev64120_irq, |
| 114 | .end = end_ev64120_irq, |
| 115 | .set_affinity = NULL |
| 116 | }; |
| 117 | |
| 118 | void gt64120_irq_setup(void) |
| 119 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | /* |
| 121 | * Clear all of the interrupts while we change the able around a bit. |
| 122 | */ |
| 123 | clear_c0_status(ST0_IM); |
| 124 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | local_irq_disable(); |
| 126 | |
| 127 | /* |
| 128 | * Enable timer. Other interrupts will be enabled as they are |
| 129 | * registered. |
| 130 | */ |
| 131 | set_c0_status(IE_IRQ2); |
| 132 | } |
| 133 | |
| 134 | void __init arch_init_irq(void) |
| 135 | { |
| 136 | int i; |
| 137 | |
| 138 | /* Let's initialize our IRQ descriptors */ |
| 139 | for (i = 0; i < NR_IRQS; i++) { |
| 140 | irq_desc[i].status = 0; |
| 141 | irq_desc[i].handler = &no_irq_type; |
| 142 | irq_desc[i].action = NULL; |
| 143 | irq_desc[i].depth = 0; |
| 144 | spin_lock_init(&irq_desc[i].lock); |
| 145 | } |
| 146 | |
| 147 | gt64120_irq_setup(); |
| 148 | } |