112 lines
2.9 KiB
C
112 lines
2.9 KiB
C
/*
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* arch/score/kernel/irq.c
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*
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* Score Processor version.
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*
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* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
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* Chen Liqin <liqin.chen@sunplusct.com>
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* Lennox Wu <lennox.wu@sunplusct.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/interrupt.h>
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#include <linux/kernel_stat.h>
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#include <linux/seq_file.h>
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#include <asm/io.h>
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/* the interrupt controller is hardcoded at this address */
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#define SCORE_PIC ((u32 __iomem __force *)0x95F50000)
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#define INT_PNDL 0
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#define INT_PNDH 1
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#define INT_PRIORITY_M 2
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#define INT_PRIORITY_SG0 4
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#define INT_PRIORITY_SG1 5
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#define INT_PRIORITY_SG2 6
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#define INT_PRIORITY_SG3 7
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#define INT_MASKL 8
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#define INT_MASKH 9
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/*
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* handles all normal device IRQs
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*/
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asmlinkage void do_IRQ(int irq)
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{
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irq_enter();
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generic_handle_irq(irq);
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irq_exit();
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}
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static void score_mask(struct irq_data *d)
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{
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unsigned int irq_source = 63 - d->irq;
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if (irq_source < 32)
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__raw_writel((__raw_readl(SCORE_PIC + INT_MASKL) | \
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(1 << irq_source)), SCORE_PIC + INT_MASKL);
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else
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__raw_writel((__raw_readl(SCORE_PIC + INT_MASKH) | \
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(1 << (irq_source - 32))), SCORE_PIC + INT_MASKH);
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}
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static void score_unmask(struct irq_data *d)
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{
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unsigned int irq_source = 63 - d->irq;
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if (irq_source < 32)
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__raw_writel((__raw_readl(SCORE_PIC + INT_MASKL) & \
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~(1 << irq_source)), SCORE_PIC + INT_MASKL);
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else
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__raw_writel((__raw_readl(SCORE_PIC + INT_MASKH) & \
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~(1 << (irq_source - 32))), SCORE_PIC + INT_MASKH);
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}
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struct irq_chip score_irq_chip = {
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.name = "Score7-level",
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.irq_mask = score_mask,
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.irq_mask_ack = score_mask,
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.irq_unmask = score_unmask,
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};
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/*
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* initialise the interrupt system
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*/
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void __init init_IRQ(void)
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{
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int index;
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unsigned long target_addr;
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for (index = 0; index < NR_IRQS; ++index)
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irq_set_chip_and_handler(index, &score_irq_chip,
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handle_level_irq);
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for (target_addr = IRQ_VECTOR_BASE_ADDR;
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target_addr <= IRQ_VECTOR_END_ADDR;
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target_addr += IRQ_VECTOR_SIZE)
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memcpy((void *)target_addr, \
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interrupt_exception_vector, IRQ_VECTOR_SIZE);
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__raw_writel(0xffffffff, SCORE_PIC + INT_MASKL);
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__raw_writel(0xffffffff, SCORE_PIC + INT_MASKH);
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__asm__ __volatile__(
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"mtcr %0, cr3\n\t"
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: : "r" (EXCEPTION_VECTOR_BASE_ADDR | \
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VECTOR_ADDRESS_OFFSET_MODE16));
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}
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