1/*
2 *	Copyright (C) 2000 YAEGASHI Takeshi
3 *	Hitachi HD64461 companion chip support
4 */
5
6#include <linux/sched.h>
7#include <linux/module.h>
8#include <linux/kernel.h>
9#include <linux/param.h>
10#include <linux/interrupt.h>
11#include <linux/init.h>
12#include <linux/irq.h>
13#include <linux/io.h>
14#include <asm/irq.h>
15#include <asm/hd64461.h>
16
17/* This belongs in cpu specific */
18#define INTC_ICR1 0xA4140010UL
19
20static void hd64461_mask_irq(struct irq_data *data)
21{
22	unsigned int irq = data->irq;
23	unsigned short nimr;
24	unsigned short mask = 1 << (irq - HD64461_IRQBASE);
25
26	nimr = __raw_readw(HD64461_NIMR);
27	nimr |= mask;
28	__raw_writew(nimr, HD64461_NIMR);
29}
30
31static void hd64461_unmask_irq(struct irq_data *data)
32{
33	unsigned int irq = data->irq;
34	unsigned short nimr;
35	unsigned short mask = 1 << (irq - HD64461_IRQBASE);
36
37	nimr = __raw_readw(HD64461_NIMR);
38	nimr &= ~mask;
39	__raw_writew(nimr, HD64461_NIMR);
40}
41
42static void hd64461_mask_and_ack_irq(struct irq_data *data)
43{
44	hd64461_mask_irq(data);
45
46#ifdef CONFIG_HD64461_ENABLER
47	if (data->irq == HD64461_IRQBASE + 13)
48		__raw_writeb(0x00, HD64461_PCC1CSCR);
49#endif
50}
51
52static struct irq_chip hd64461_irq_chip = {
53	.name		= "HD64461-IRQ",
54	.irq_mask	= hd64461_mask_irq,
55	.irq_mask_ack	= hd64461_mask_and_ack_irq,
56	.irq_unmask	= hd64461_unmask_irq,
57};
58
59static void hd64461_irq_demux(struct irq_desc *desc)
60{
61	unsigned short intv = __raw_readw(HD64461_NIRR);
62	unsigned int ext_irq = HD64461_IRQBASE;
63
64	intv &= (1 << HD64461_IRQ_NUM) - 1;
65
66	for (; intv; intv >>= 1, ext_irq++) {
67		if (!(intv & 1))
68			continue;
69
70		generic_handle_irq(ext_irq);
71	}
72}
73
74int __init setup_hd64461(void)
75{
76	int irq_base, i;
77
78	printk(KERN_INFO
79	       "HD64461 configured at 0x%x on irq %d(mapped into %d to %d)\n",
80	       HD64461_IOBASE, CONFIG_HD64461_IRQ, HD64461_IRQBASE,
81	       HD64461_IRQBASE + 15);
82
83/* Should be at processor specific part.. */
84#if defined(CONFIG_CPU_SUBTYPE_SH7709)
85	__raw_writew(0x2240, INTC_ICR1);
86#endif
87	__raw_writew(0xffff, HD64461_NIMR);
88
89	irq_base = irq_alloc_descs(HD64461_IRQBASE, HD64461_IRQBASE, 16, -1);
90	if (IS_ERR_VALUE(irq_base)) {
91		pr_err("%s: failed hooking irqs for HD64461\n", __func__);
92		return irq_base;
93	}
94
95	for (i = 0; i < 16; i++)
96		irq_set_chip_and_handler(irq_base + i, &hd64461_irq_chip,
97					 handle_level_irq);
98
99	irq_set_chained_handler(CONFIG_HD64461_IRQ, hd64461_irq_demux);
100	irq_set_irq_type(CONFIG_HD64461_IRQ, IRQ_TYPE_LEVEL_LOW);
101
102#ifdef CONFIG_HD64461_ENABLER
103	printk(KERN_INFO "HD64461: enabling PCMCIA devices\n");
104	__raw_writeb(0x4c, HD64461_PCC1CSCIER);
105	__raw_writeb(0x00, HD64461_PCC1CSCR);
106#endif
107
108	return 0;
109}
110
111module_init(setup_hd64461);
112