| Ricardo Ribalda Delgado | 95c5020 | 2008-07-17 11:44:12 +0200 | [diff] [blame] | 1 | /* |
| 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 | |
| 30 | DECLARE_GLOBAL_DATA_PTR; |
| 31 | |
| 32 | void 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 | |
| 51 | int 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 | |
| 68 | void 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 | |
| 75 | void 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 | |
| 82 | void 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 | |
| 89 | void 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 | } |