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