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https://github.com/zephyrproject-rtos/zephyr
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8778152298
The initialization code and macros are the same. So extracts it and puts it into the driver. This is another step to follow the driver model. Change-Id: I1af8b2888779b2b58367feaff9ee1a6d97b4873c Signed-off-by: Daniel Leung <daniel.leung@intel.com>
68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
/*
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* Copyright (c) 2010-2015 Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @file
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* @brief Disable Intel 8259A PIC (Programmable Interrupt Controller)
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*
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* This module disables the Intel 8259A PIC (Programmable Interrupt Controller)
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* to prevent it from generating spurious interrupts.
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*/
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#include <nanokernel.h>
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#include <arch/cpu.h>
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#include <toolchain.h>
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#include <sections.h>
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#include <device.h>
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#include <init.h>
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#include <board.h>
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/* programmable interrupt controller info (pair of cascaded 8259A devices) */
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#define PIC_MASTER_BASE_ADRS 0x20
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#define PIC_SLAVE_BASE_ADRS 0xa0
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#define PIC_REG_ADDR_INTERVAL 1
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/* register definitions */
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#define PIC_ADRS(baseAdrs, reg) (baseAdrs + (reg * PIC_REG_ADDR_INTERVAL))
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#define PIC_PORT2(base) PIC_ADRS(base, 0x01) /* port 2 */
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#define PIC_DISABLE 0xff /* Disable PIC command */
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/**
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*
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* @brief Initialize the Intel 8259A PIC device driver
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*
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* This routine disables the 8259A PIC device to prevent it from
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* generating spurious interrupts.
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*
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* @return N/A
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*/
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int _i8259_init(struct device *unused)
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{
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ARG_UNUSED(unused);
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sys_out8(PIC_DISABLE, PIC_PORT2(PIC_SLAVE_BASE_ADRS));
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sys_out8(PIC_DISABLE, PIC_PORT2(PIC_MASTER_BASE_ADRS));
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return 0;
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}
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DECLARE_DEVICE_INIT_CONFIG(pic_0, "", _i8259_init, NULL);
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SYS_DEFINE_DEVICE(pic_0, NULL, PRIMARY,
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CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
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