113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2000 YAEGASHI Takeshi
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* Hitachi HD64461 companion chip support
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*/
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#include <linux/sched.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/param.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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#include <asm/irq.h>
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#include <asm/hd64461.h>
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/* This belongs in cpu specific */
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#define INTC_ICR1 0xA4140010UL
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static void hd64461_mask_irq(struct irq_data *data)
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{
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unsigned int irq = data->irq;
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unsigned short nimr;
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unsigned short mask = 1 << (irq - HD64461_IRQBASE);
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nimr = __raw_readw(HD64461_NIMR);
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nimr |= mask;
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__raw_writew(nimr, HD64461_NIMR);
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}
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static void hd64461_unmask_irq(struct irq_data *data)
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{
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unsigned int irq = data->irq;
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unsigned short nimr;
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unsigned short mask = 1 << (irq - HD64461_IRQBASE);
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nimr = __raw_readw(HD64461_NIMR);
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nimr &= ~mask;
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__raw_writew(nimr, HD64461_NIMR);
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}
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static void hd64461_mask_and_ack_irq(struct irq_data *data)
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{
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hd64461_mask_irq(data);
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#ifdef CONFIG_HD64461_ENABLER
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if (data->irq == HD64461_IRQBASE + 13)
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__raw_writeb(0x00, HD64461_PCC1CSCR);
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#endif
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}
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static struct irq_chip hd64461_irq_chip = {
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.name = "HD64461-IRQ",
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.irq_mask = hd64461_mask_irq,
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.irq_mask_ack = hd64461_mask_and_ack_irq,
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.irq_unmask = hd64461_unmask_irq,
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};
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static void hd64461_irq_demux(struct irq_desc *desc)
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{
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unsigned short intv = __raw_readw(HD64461_NIRR);
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unsigned int ext_irq = HD64461_IRQBASE;
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intv &= (1 << HD64461_IRQ_NUM) - 1;
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for (; intv; intv >>= 1, ext_irq++) {
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if (!(intv & 1))
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continue;
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generic_handle_irq(ext_irq);
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}
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}
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int __init setup_hd64461(void)
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{
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int irq_base, i;
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printk(KERN_INFO
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"HD64461 configured at 0x%x on irq %d(mapped into %d to %d)\n",
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HD64461_IOBASE, CONFIG_HD64461_IRQ, HD64461_IRQBASE,
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HD64461_IRQBASE + 15);
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/* Should be at processor specific part.. */
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#if defined(CONFIG_CPU_SUBTYPE_SH7709)
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__raw_writew(0x2240, INTC_ICR1);
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#endif
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__raw_writew(0xffff, HD64461_NIMR);
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irq_base = irq_alloc_descs(HD64461_IRQBASE, HD64461_IRQBASE, 16, -1);
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if (IS_ERR_VALUE(irq_base)) {
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pr_err("%s: failed hooking irqs for HD64461\n", __func__);
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return irq_base;
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}
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for (i = 0; i < 16; i++)
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irq_set_chip_and_handler(irq_base + i, &hd64461_irq_chip,
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handle_level_irq);
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irq_set_chained_handler(CONFIG_HD64461_IRQ, hd64461_irq_demux);
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irq_set_irq_type(CONFIG_HD64461_IRQ, IRQ_TYPE_LEVEL_LOW);
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#ifdef CONFIG_HD64461_ENABLER
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printk(KERN_INFO "HD64461: enabling PCMCIA devices\n");
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__raw_writeb(0x4c, HD64461_PCC1CSCIER);
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__raw_writeb(0x00, HD64461_PCC1CSCR);
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#endif
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return 0;
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}
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module_init(setup_hd64461);
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