blob: 71087771cb603e4426177888322f3960138fe69d [file] [log] [blame]
Ricardo Ribalda Delgadod865fd02008-07-17 11:44:12 +02001/*
2 * (C) Copyright 2008
3 * Ricado Ribalda-Universidad Autonoma de Madrid-ricardo.ribalda@uam.es
4 * This work has been supported by: QTechnology http://qtec.com/
5 * Based on interrupts.c Wolfgang Denk-DENX Software Engineering-wd@denx.de
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18*/
19#include <common.h>
20#include <watchdog.h>
21#include <command.h>
22#include <asm/processor.h>
23#include <asm/interrupt.h>
24#include <ppc4xx.h>
25#include <ppc_asm.tmpl>
26#include <commproc.h>
27#include <asm/io.h>
28#include <asm/xilinx_irq.h>
29
30DECLARE_GLOBAL_DATA_PTR;
31
32void pic_enable(void)
33{
34 debug("Xilinx PIC at 0x%8x\n", intc);
35
36 /*
37 * Disable all external interrupts until they are
38 * explicitly requested.
39 */
40 out_be32((u32 *) IER, 0);
41
42 /* Acknowledge any pending interrupts just in case. */
43 out_be32((u32 *) IAR, 0xffffffff);
44
45 /* Turn on the Master Enable. */
46 out_be32((u32 *) MER, 0x3UL);
47
48 return;
49}
50
51int xilinx_pic_irq_get(void)
52{
53 u32 irq;
54 irq = in_be32((u32 *) IVR);
55
56 /* If no interrupt is pending then all bits of the IVR are set to 1. As
57 * the IVR is as many bits wide as numbers of inputs are available.
58 * Therefore, if all bits of the IVR are set to one, its content will
59 * be bigger than XPAR_INTC_MAX_NUM_INTR_INPUTS.
60 */
61 if (irq >= XPAR_INTC_MAX_NUM_INTR_INPUTS)
62 irq = -1; /* report no pending interrupt. */
63
64 debug("get_irq: %d\n", irq);
65 return (irq);
66}
67
68void pic_irq_enable(unsigned int irq)
69{
70 u32 mask = IRQ_MASK(irq);
71 debug("enable: %d\n", irq);
72 out_be32((u32 *) SIE, mask);
73}
74
75void pic_irq_disable(unsigned int irq)
76{
77 u32 mask = IRQ_MASK(irq);
78 debug("disable: %d\n", irq);
79 out_be32((u32 *) CIE, mask);
80}
81
82void pic_irq_ack(unsigned int irq)
83{
84 u32 mask = IRQ_MASK(irq);
85 debug("ack: %d\n", irq);
86 out_be32((u32 *) IAR, mask);
87}
88
89void external_interrupt(struct pt_regs *regs)
90{
91 int irq;
92
93 irq = xilinx_pic_irq_get();
94 if (irq < 0)
95 return;
96
97 interrupt_run_handler(irq);
98
99 return;
100}