aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-omap1/irq.c
blob: a11b6d807352ccf93add9b87dae0069f204d6bc3 (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
227
228
229
230
231
232
233
234
/*
 * linux/arch/arm/mach-omap/irq.c
 *
 * Interrupt handler for all OMAP boards
 *
 * Copyright (C) 2004 Nokia Corporation
 * Written by Tony Lindgren <tony@atomide.com>
 * Major cleanups by Juha Yrj�l� <juha.yrjola@nokia.com>
 *
 * Completely re-written to support various OMAP chips with bank specific
 * interrupt handlers.
 *
 * Some snippets of the code taken from the older OMAP interrupt handler
 * Copyright (C) 2001 RidgeRun, Inc. Greg Lonnon <glonnon@ridgerun.com>
 *
 * GPIO interrupt handler moved to gpio.c by Juha Yrjola
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * You should have received a copy of the  GNU General Public License along
 * with this program; if not, write  to the Free Software Foundation, Inc.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/config.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>

#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>
#include <asm/arch/gpio.h>

#include <asm/io.h>

#define IRQ_BANK(irq) ((irq) >> 5)
#define IRQ_BIT(irq)  ((irq) & 0x1f)

struct omap_irq_bank {
	unsigned long base_reg;
	unsigned long trigger_map;
	unsigned long wake_enable;
};

static unsigned int irq_bank_count = 0;
static struct omap_irq_bank *irq_banks;

static inline unsigned int irq_bank_readl(int bank, int offset)
{
	return omap_readl(irq_banks[bank].base_reg + offset);
}

static inline void irq_bank_writel(unsigned long value, int bank, int offset)
{
	omap_writel(value, irq_banks[bank].base_reg + offset);
}

static void omap_ack_irq(unsigned int irq)
{
	if (irq > 31)
		omap_writel(0x1, OMAP_IH2_BASE + IRQ_CONTROL_REG_OFFSET);

	omap_writel(0x1, OMAP_IH1_BASE + IRQ_CONTROL_REG_OFFSET);
}

static void omap_mask_irq(unsigned int irq)
{
	int bank = IRQ_BANK(irq);
	u32 l;

	l = omap_readl(irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
	l |= 1 << IRQ_BIT(irq);
	omap_writel(l, irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
}

static void omap_unmask_irq(unsigned int irq)
{
	int bank = IRQ_BANK(irq);
	u32 l;

	l = omap_readl(irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
	l &= ~(1 << IRQ_BIT(irq));
	omap_writel(l, irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
}

static void omap_mask_ack_irq(unsigned int irq)
{
	omap_mask_irq(irq);
	omap_ack_irq(irq);
}

static int omap_wake_irq(unsigned int irq, unsigned int enable)
{
	int bank = IRQ_BANK(irq);

	if (enable)
		irq_banks[bank].wake_enable |= IRQ_BIT(irq);
	else
		irq_banks[bank].wake_enable &= ~IRQ_BIT(irq);

	return 0;
}


/*
 * Allows tuning the IRQ type and priority
 *
 * NOTE: There is currently no OMAP fiq handler for Linux. Read the
 *	 mailing list threads on FIQ handlers if you are planning to
 *	 add a FIQ handler for OMAP.
 */
static void omap_irq_set_cfg(int irq, int fiq, int priority, int trigger)
{
	signed int bank;
	unsigned long val, offset;

	bank = IRQ_BANK(irq);
	/* FIQ is only available on bank 0 interrupts */
	fiq = bank ? 0 : (fiq & 0x1);
	val = fiq | ((priority & 0x1f) << 2) | ((trigger & 0x1) << 1);
	offset = IRQ_ILR0_REG_OFFSET + IRQ_BIT(irq) * 0x4;
	irq_bank_writel(val, bank, offset);
}

#ifdef CONFIG_ARCH_OMAP730
static struct omap_irq_bank omap730_irq_banks[] = {
	{ .base_reg = OMAP_IH1_BASE, 		.trigger_map = 0xb3f8e22f },
	{ .base_reg = OMAP_IH2_BASE, 		.trigger_map = 0xfdb9c1f2 },
	{ .base_reg = OMAP_IH2_BASE + 0x100,	.trigger_map = 0x800040f3 },
};
#endif

#ifdef CONFIG_ARCH_OMAP1510
static struct omap_irq_bank omap1510_irq_banks[] = {
	{ .base_reg = OMAP_IH1_BASE, 		.trigger_map = 0xb3febfff },
	{ .base_reg = OMAP_IH2_BASE, 		.trigger_map = 0xffbfffed },
};
#endif

#if defined(CONFIG_ARCH_OMAP16XX)

static struct omap_irq_bank omap1610_irq_banks[] = {
	{ .base_reg = OMAP_IH1_BASE, 		.trigger_map = 0xb3fefe8f },
	{ .base_reg = OMAP_IH2_BASE, 		.trigger_map = 0xfdb7c1fd },
	{ .base_reg = OMAP_IH2_BASE + 0x100,	.trigger_map = 0xffffb7ff },
	{ .base_reg = OMAP_IH2_BASE + 0x200,	.trigger_map = 0xffffffff },
};
#endif

static struct irqchip omap_irq_chip = {
	.ack    = omap_mask_ack_irq,
	.mask   = omap_mask_irq,
	.unmask = omap_unmask_irq,
	.wake	= omap_wake_irq,
};

void __init omap_init_irq(void)
{
	int i, j;

#ifdef CONFIG_ARCH_OMAP730
	if (cpu_is_omap730()) {
		irq_banks = omap730_irq_banks;
		irq_bank_count = ARRAY_SIZE(omap730_irq_banks);
	}
#endif
#ifdef CONFIG_ARCH_OMAP1510
	if (cpu_is_omap1510()) {
		irq_banks = omap1510_irq_banks;
		irq_bank_count = ARRAY_SIZE(omap1510_irq_banks);
	}
#endif
#if defined(CONFIG_ARCH_OMAP16XX)
	if (cpu_is_omap16xx()) {
		irq_banks = omap1610_irq_banks;
		irq_bank_count = ARRAY_SIZE(omap1610_irq_banks);
	}
#endif
	printk("Total of %i interrupts in %i interrupt banks\n",
	       irq_bank_count * 32, irq_bank_count);

	/* Mask and clear all interrupts */
	for (i = 0; i < irq_bank_count; i++) {
		irq_bank_writel(~0x0, i, IRQ_MIR_REG_OFFSET);
		irq_bank_writel(0x0, i, IRQ_ITR_REG_OFFSET);
	}

	/* Clear any pending interrupts */
	irq_bank_writel(0x03, 0, IRQ_CONTROL_REG_OFFSET);
	irq_bank_writel(0x03, 1, IRQ_CONTROL_REG_OFFSET);

	/* Enable interrupts in global mask */
	if (cpu_is_omap730()) {
		irq_bank_writel(0x0, 0, IRQ_GMR_REG_OFFSET);
	}

	/* Install the interrupt handlers for each bank */
	for (i = 0; i < irq_bank_count; i++) {
		for (j = i * 32; j < (i + 1) * 32; j++) {
			int irq_trigger;

			irq_trigger = irq_banks[i].trigger_map >> IRQ_BIT(j);
			omap_irq_set_cfg(j, 0, 0, irq_trigger);

			set_irq_chip(j, &omap_irq_chip);
			set_irq_handler(j, do_level_IRQ);
			set_irq_flags(j, IRQF_VALID);
		}
	}

	/* Unmask level 2 handler */
	if (cpu_is_omap730()) {
		omap_unmask_irq(INT_730_IH2_IRQ);
	} else {
		omap_unmask_irq(INT_IH2_IRQ);
	}
}