aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/mach-rpc/irq.c
blob: dc29384b6ef86376cc9b5a228ee2891b57aea667 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
// SPDX-License-Identifier: GPL-2.0
#include <linux/init.h>
#include <linux/list.h>
#include <linux/io.h>

#include <asm/mach/irq.h>
#include <asm/hardware/iomd.h>
#include <asm/irq.h>
#include <asm/fiq.h>

// These are offsets from the stat register for each IRQ bank
#define STAT	0x00
#define REQ	0x04
#define CLR	0x04
#define MASK	0x08

static const u8 irq_prio_h[256] = {
	 0, 8, 9, 8,10,10,10,10,11,11,11,11,10,10,10,10,
	12, 8, 9, 8,10,10,10,10,11,11,11,11,10,10,10,10,
	13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
	13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
	14,14,14,14,10,10,10,10,11,11,11,11,10,10,10,10,
	14,14,14,14,10,10,10,10,11,11,11,11,10,10,10,10,
	13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
	13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
	15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10,
	15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10,
	13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
	13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
	15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10,
	15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10,
	13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
	13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
};

static const u8 irq_prio_d[256] = {
	 0,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
	20,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
	21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
	21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
	22,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
	22,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
	21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
	21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
	23,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
	23,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
	21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
	21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
	22,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
	22,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
	21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
	21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
};

static const u8 irq_prio_l[256] = {
	 0, 0, 1, 0, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
	 4, 0, 1, 0, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
	 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
	 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
	 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3,
	 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3,
	 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
	 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
	 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
	 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
	 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
	 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
	 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
	 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
	 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
	 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
};

static int iomd_get_irq_nr(void)
{
	int irq;
	u8 reg;

	/* get highest priority first */
	reg = readb(IOC_BASE + IOMD_IRQREQB);
	irq = irq_prio_h[reg];
	if (irq)
		return irq;

	/* get DMA  */
	reg = readb(IOC_BASE + IOMD_DMAREQ);
	irq = irq_prio_d[reg];
	if (irq)
		return irq;

	/* get low priority */
	reg = readb(IOC_BASE + IOMD_IRQREQA);
	irq = irq_prio_l[reg];
	if (irq)
		return irq;
	return 0;
}

static void iomd_handle_irq(struct pt_regs *regs)
{
	int irq;

	do {
		irq = iomd_get_irq_nr();
		if (irq)
			generic_handle_irq(irq);
	} while (irq);
}

static void __iomem *iomd_get_base(struct irq_data *d)
{
	void *cd = irq_data_get_irq_chip_data(d);

	return (void __iomem *)(unsigned long)cd;
}

static void iomd_set_base_mask(unsigned int irq, void __iomem *base, u32 mask)
{
	struct irq_data *d = irq_get_irq_data(irq);

	d->mask = mask;
	irq_set_chip_data(irq, (void *)(unsigned long)base);
}

static void iomd_irq_mask_ack(struct irq_data *d)
{
	void __iomem *base = iomd_get_base(d);
	unsigned int val, mask = d->mask;

	val = readb(base + MASK);
	writeb(val & ~mask, base + MASK);
	writeb(mask, base + CLR);
}

static void iomd_irq_mask(struct irq_data *d)
{
	void __iomem *base = iomd_get_base(d);
	unsigned int val, mask = d->mask;

	val = readb(base + MASK);
	writeb(val & ~mask, base + MASK);
}

static void iomd_irq_unmask(struct irq_data *d)
{
	void __iomem *base = iomd_get_base(d);
	unsigned int val, mask = d->mask;

	val = readb(base + MASK);
	writeb(val | mask, base + MASK);
}

static struct irq_chip iomd_chip_clr = {
	.irq_mask_ack	= iomd_irq_mask_ack,
	.irq_mask	= iomd_irq_mask,
	.irq_unmask	= iomd_irq_unmask,
};

static struct irq_chip iomd_chip_noclr = {
	.irq_mask	= iomd_irq_mask,
	.irq_unmask	= iomd_irq_unmask,
};

extern unsigned char rpc_default_fiq_start, rpc_default_fiq_end;

void __init rpc_init_irq(void)
{
	unsigned int irq, clr, set;

	iomd_writeb(0, IOMD_IRQMASKA);
	iomd_writeb(0, IOMD_IRQMASKB);
	iomd_writeb(0, IOMD_FIQMASK);
	iomd_writeb(0, IOMD_DMAMASK);

	set_fiq_handler(&rpc_default_fiq_start,
		&rpc_default_fiq_end - &rpc_default_fiq_start);

	set_handle_irq(iomd_handle_irq);

	for (irq = 0; irq < NR_IRQS; irq++) {
		clr = IRQ_NOREQUEST;
		set = 0;

		if (irq <= 6 || (irq >= 9 && irq <= 15))
			clr |= IRQ_NOPROBE;

		if (irq == 21 || (irq >= 16 && irq <= 19) ||
		    irq == IRQ_KEYBOARDTX)
			set |= IRQ_NOAUTOEN;

		switch (irq) {
		case 0 ... 7:
			irq_set_chip_and_handler(irq, &iomd_chip_clr,
						 handle_level_irq);
			irq_modify_status(irq, clr, set);
			iomd_set_base_mask(irq, IOMD_BASE + IOMD_IRQSTATA,
					   BIT(irq));
			break;

		case 8 ... 15:
			irq_set_chip_and_handler(irq, &iomd_chip_noclr,
						 handle_level_irq);
			irq_modify_status(irq, clr, set);
			iomd_set_base_mask(irq, IOMD_BASE + IOMD_IRQSTATB,
					   BIT(irq - 8));
			break;

		case 16 ... 21:
			irq_set_chip_and_handler(irq, &iomd_chip_noclr,
						 handle_level_irq);
			irq_modify_status(irq, clr, set);
			iomd_set_base_mask(irq, IOMD_BASE + IOMD_DMASTAT,
					   BIT(irq - 16));
			break;

		case 64 ... 71:
			irq_set_chip(irq, &iomd_chip_noclr);
			irq_modify_status(irq, clr, set);
			iomd_set_base_mask(irq, IOMD_BASE + IOMD_FIQSTAT,
					   BIT(irq - 64));
			break;
		}
	}

	init_FIQ(FIQ_START);
}