| 1 | /*
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| 2 | * Copyright (c) 2006 Ondrej Palkovsky
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup kernel_ppc32
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #include <arch/drivers/pic.h>
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| 36 | #include <mm/km.h>
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| 37 | #include <byteorder.h>
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| 38 | #include <bitops.h>
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| 39 |
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| 40 | static volatile uint32_t *pic = NULL;
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| 41 |
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| 42 | void pic_init(uintptr_t base, size_t size, cir_t *cir, void **cir_arg)
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| 43 | {
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| 44 | pic = (uint32_t *) km_map(base, size, KM_NATURAL_ALIGNMENT,
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| 45 | PAGE_WRITE | PAGE_NOT_CACHEABLE);
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| 46 | *cir = pic_ack_interrupt;
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| 47 | *cir_arg = NULL;
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| 48 | }
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| 49 |
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| 50 | void pic_enable_interrupt(inr_t intnum)
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| 51 | {
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| 52 | if (pic) {
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| 53 | if (intnum < 32)
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| 54 | pic[PIC_MASK_LOW] = pic[PIC_MASK_LOW] | (1 << intnum);
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| 55 | else
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| 56 | pic[PIC_MASK_HIGH] = pic[PIC_MASK_HIGH] | (1 << (intnum - 32));
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| 57 | }
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| 58 |
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| 59 | }
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| 60 |
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| 61 | void pic_disable_interrupt(inr_t intnum)
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| 62 | {
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| 63 | if (pic) {
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| 64 | if (intnum < 32)
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| 65 | pic[PIC_MASK_LOW] = pic[PIC_MASK_LOW] & (~(1 << intnum));
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| 66 | else
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| 67 | pic[PIC_MASK_HIGH] = pic[PIC_MASK_HIGH] & (~(1 << (intnum - 32)));
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| 68 | }
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| 69 | }
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| 70 |
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| 71 | void pic_ack_interrupt(void *arg, inr_t intnum)
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| 72 | {
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| 73 | if (pic) {
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| 74 | if (intnum < 32)
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| 75 | pic[PIC_ACK_LOW] = 1 << intnum;
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| 76 | else
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| 77 | pic[PIC_ACK_HIGH] = 1 << (intnum - 32);
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| 78 | }
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| 79 | }
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| 80 |
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| 81 | /** Return number of pending interrupts
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| 82 | *
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| 83 | */
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| 84 | uint8_t pic_get_pending(void)
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| 85 | {
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| 86 | if (pic) {
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| 87 | uint32_t pending;
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| 88 |
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| 89 | pending = pic[PIC_PENDING_LOW];
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| 90 | if (pending != 0)
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| 91 | return fnzb32(pending);
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| 92 |
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| 93 | pending = pic[PIC_PENDING_HIGH];
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| 94 | if (pending != 0)
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| 95 | return fnzb32(pending) + 32;
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| 96 | }
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| 97 |
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| 98 | return 255;
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| 99 | }
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| 100 |
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| 101 | /** @}
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| 102 | */
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