2 * linux/arch/arm/mach-omap2/irq.c
4 * Interrupt handler for OMAP2 boards.
6 * Copyright (C) 2005 Nokia Corporation
7 * Author: Paul Mundt <paul.mundt@nokia.com>
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License. See the file "COPYING" in the main directory of this archive
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
19 #include <asm/exception.h>
20 #include <asm/mach/irq.h>
21 #include <linux/irqdomain.h>
23 #include <linux/of_address.h>
24 #include <linux/of_irq.h>
26 #include <mach/hardware.h>
31 /* selected INTC register offsets */
33 #define INTC_REVISION 0x0000
34 #define INTC_SYSCONFIG 0x0010
35 #define INTC_SYSSTATUS 0x0014
36 #define INTC_SIR 0x0040
37 #define INTC_CONTROL 0x0048
38 #define INTC_PROTECTION 0x004C
39 #define INTC_IDLE 0x0050
40 #define INTC_THRESHOLD 0x0068
41 #define INTC_MIR0 0x0084
42 #define INTC_MIR_CLEAR0 0x0088
43 #define INTC_MIR_SET0 0x008c
44 #define INTC_PENDING_IRQ0 0x0098
45 /* Number of IRQ state bits in each MIR register */
46 #define IRQ_BITS_PER_REG 32
48 #define OMAP2_IRQ_BASE OMAP2_L4_IO_ADDRESS(OMAP24XX_IC_BASE)
49 #define OMAP3_IRQ_BASE OMAP2_L4_IO_ADDRESS(OMAP34XX_IC_BASE)
50 #define INTCPS_SIR_IRQ_OFFSET 0x0040 /* omap2/3 active interrupt offset */
51 #define ACTIVEIRQ_MASK 0x7f /* omap2/3 active interrupt bits */
52 #define INTCPS_NR_MIR_REGS 3
53 #define INTCPS_NR_IRQS 96
56 * OMAP2 has a number of different interrupt controllers, each interrupt
57 * controller is identified as its own "bank". Register definitions are
58 * fairly consistent for each bank, but not all registers are implemented
59 * for each bank.. when in doubt, consult the TRM.
61 static struct omap_irq_bank
{
62 void __iomem
*base_reg
;
64 } __attribute__ ((aligned(4))) irq_banks
[] = {
71 static struct irq_domain
*domain
;
73 /* Structure to save interrupt controller context */
74 struct omap3_intc_regs
{
79 u32 ilr
[INTCPS_NR_IRQS
];
80 u32 mir
[INTCPS_NR_MIR_REGS
];
83 /* INTC bank register get/set */
85 static void intc_bank_write_reg(u32 val
, struct omap_irq_bank
*bank
, u16 reg
)
87 __raw_writel(val
, bank
->base_reg
+ reg
);
90 static u32
intc_bank_read_reg(struct omap_irq_bank
*bank
, u16 reg
)
92 return __raw_readl(bank
->base_reg
+ reg
);
95 /* XXX: FIQ and additional INTC support (only MPU at the moment) */
96 static void omap_ack_irq(struct irq_data
*d
)
98 intc_bank_write_reg(0x1, &irq_banks
[0], INTC_CONTROL
);
101 static void omap_mask_ack_irq(struct irq_data
*d
)
103 irq_gc_mask_disable_reg(d
);
107 static void __init
omap_irq_bank_init_one(struct omap_irq_bank
*bank
)
111 tmp
= intc_bank_read_reg(bank
, INTC_REVISION
) & 0xff;
112 printk(KERN_INFO
"IRQ: Found an INTC at 0x%p "
113 "(revision %ld.%ld) with %d interrupts\n",
114 bank
->base_reg
, tmp
>> 4, tmp
& 0xf, bank
->nr_irqs
);
116 tmp
= intc_bank_read_reg(bank
, INTC_SYSCONFIG
);
117 tmp
|= 1 << 1; /* soft reset */
118 intc_bank_write_reg(tmp
, bank
, INTC_SYSCONFIG
);
120 while (!(intc_bank_read_reg(bank
, INTC_SYSSTATUS
) & 0x1))
121 /* Wait for reset to complete */;
123 /* Enable autoidle */
124 intc_bank_write_reg(1 << 0, bank
, INTC_SYSCONFIG
);
127 int omap_irq_pending(void)
131 for (i
= 0; i
< ARRAY_SIZE(irq_banks
); i
++) {
132 struct omap_irq_bank
*bank
= irq_banks
+ i
;
135 for (irq
= 0; irq
< bank
->nr_irqs
; irq
+= 32)
136 if (intc_bank_read_reg(bank
, INTC_PENDING_IRQ0
+
144 omap_alloc_gc(void __iomem
*base
, unsigned int irq_start
, unsigned int num
)
146 struct irq_chip_generic
*gc
;
147 struct irq_chip_type
*ct
;
149 gc
= irq_alloc_generic_chip("INTC", 1, irq_start
, base
,
152 ct
->chip
.irq_ack
= omap_mask_ack_irq
;
153 ct
->chip
.irq_mask
= irq_gc_mask_disable_reg
;
154 ct
->chip
.irq_unmask
= irq_gc_unmask_enable_reg
;
155 ct
->chip
.flags
|= IRQCHIP_SKIP_SET_WAKE
;
157 ct
->regs
.enable
= INTC_MIR_CLEAR0
;
158 ct
->regs
.disable
= INTC_MIR_SET0
;
159 irq_setup_generic_chip(gc
, IRQ_MSK(num
), IRQ_GC_INIT_MASK_CACHE
,
160 IRQ_NOREQUEST
| IRQ_NOPROBE
, 0);
163 static void __init
omap_init_irq(u32 base
, int nr_irqs
,
164 struct device_node
*node
)
166 void __iomem
*omap_irq_base
;
167 unsigned long nr_of_irqs
= 0;
168 unsigned int nr_banks
= 0;
171 omap_irq_base
= ioremap(base
, SZ_4K
);
172 if (WARN_ON(!omap_irq_base
))
175 irq_base
= irq_alloc_descs(-1, 0, nr_irqs
, 0);
177 pr_warn("Couldn't allocate IRQ numbers\n");
181 domain
= irq_domain_add_legacy(node
, nr_irqs
, irq_base
, 0,
182 &irq_domain_simple_ops
, NULL
);
184 for (i
= 0; i
< ARRAY_SIZE(irq_banks
); i
++) {
185 struct omap_irq_bank
*bank
= irq_banks
+ i
;
187 bank
->nr_irqs
= nr_irqs
;
189 /* Static mapping, never released */
190 bank
->base_reg
= ioremap(base
, SZ_4K
);
191 if (!bank
->base_reg
) {
192 pr_err("Could not ioremap irq bank%i\n", i
);
196 omap_irq_bank_init_one(bank
);
198 for (j
= 0; j
< bank
->nr_irqs
; j
+= 32)
199 omap_alloc_gc(bank
->base_reg
+ j
, j
+ irq_base
, 32);
201 nr_of_irqs
+= bank
->nr_irqs
;
205 pr_info("Total of %ld interrupts on %d active controller%s\n",
206 nr_of_irqs
, nr_banks
, nr_banks
> 1 ? "s" : "");
209 void __init
omap2_init_irq(void)
211 omap_init_irq(OMAP24XX_IC_BASE
, 96, NULL
);
214 void __init
omap3_init_irq(void)
216 omap_init_irq(OMAP34XX_IC_BASE
, 96, NULL
);
219 void __init
ti81xx_init_irq(void)
221 omap_init_irq(OMAP34XX_IC_BASE
, 128, NULL
);
224 static inline void omap_intc_handle_irq(void __iomem
*base_addr
, struct pt_regs
*regs
)
229 irqnr
= readl_relaxed(base_addr
+ 0x98);
233 irqnr
= readl_relaxed(base_addr
+ 0xb8);
237 irqnr
= readl_relaxed(base_addr
+ 0xd8);
238 #ifdef CONFIG_SOC_TI81XX
241 irqnr
= readl_relaxed(base_addr
+ 0xf8);
248 irqnr
= readl_relaxed(base_addr
+ INTCPS_SIR_IRQ_OFFSET
);
249 irqnr
&= ACTIVEIRQ_MASK
;
252 irqnr
= irq_find_mapping(domain
, irqnr
);
253 handle_IRQ(irqnr
, regs
);
258 asmlinkage
void __exception_irq_entry
omap2_intc_handle_irq(struct pt_regs
*regs
)
260 void __iomem
*base_addr
= OMAP2_IRQ_BASE
;
261 omap_intc_handle_irq(base_addr
, regs
);
264 int __init
intc_of_init(struct device_node
*node
,
265 struct device_node
*parent
)
273 if (of_address_to_resource(node
, 0, &res
)) {
274 WARN(1, "unable to get intc registers\n");
278 if (of_property_read_u32(node
, "ti,intc-size", &nr_irq
))
279 pr_warn("unable to get intc-size, default to %d\n", nr_irq
);
281 omap_init_irq(res
.start
, nr_irq
, of_node_get(node
));
286 static struct of_device_id irq_match
[] __initdata
= {
287 { .compatible
= "ti,omap2-intc", .data
= intc_of_init
, },
291 void __init
omap_intc_of_init(void)
293 of_irq_init(irq_match
);
296 #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM33XX)
297 static struct omap3_intc_regs intc_context
[ARRAY_SIZE(irq_banks
)];
299 void omap_intc_save_context(void)
302 for (ind
= 0; ind
< ARRAY_SIZE(irq_banks
); ind
++) {
303 struct omap_irq_bank
*bank
= irq_banks
+ ind
;
304 intc_context
[ind
].sysconfig
=
305 intc_bank_read_reg(bank
, INTC_SYSCONFIG
);
306 intc_context
[ind
].protection
=
307 intc_bank_read_reg(bank
, INTC_PROTECTION
);
308 intc_context
[ind
].idle
=
309 intc_bank_read_reg(bank
, INTC_IDLE
);
310 intc_context
[ind
].threshold
=
311 intc_bank_read_reg(bank
, INTC_THRESHOLD
);
312 for (i
= 0; i
< INTCPS_NR_IRQS
; i
++)
313 intc_context
[ind
].ilr
[i
] =
314 intc_bank_read_reg(bank
, (0x100 + 0x4*i
));
315 for (i
= 0; i
< INTCPS_NR_MIR_REGS
; i
++)
316 intc_context
[ind
].mir
[i
] =
317 intc_bank_read_reg(&irq_banks
[0], INTC_MIR0
+
322 void omap_intc_restore_context(void)
326 for (ind
= 0; ind
< ARRAY_SIZE(irq_banks
); ind
++) {
327 struct omap_irq_bank
*bank
= irq_banks
+ ind
;
328 intc_bank_write_reg(intc_context
[ind
].sysconfig
,
329 bank
, INTC_SYSCONFIG
);
330 intc_bank_write_reg(intc_context
[ind
].sysconfig
,
331 bank
, INTC_SYSCONFIG
);
332 intc_bank_write_reg(intc_context
[ind
].protection
,
333 bank
, INTC_PROTECTION
);
334 intc_bank_write_reg(intc_context
[ind
].idle
,
336 intc_bank_write_reg(intc_context
[ind
].threshold
,
337 bank
, INTC_THRESHOLD
);
338 for (i
= 0; i
< INTCPS_NR_IRQS
; i
++)
339 intc_bank_write_reg(intc_context
[ind
].ilr
[i
],
340 bank
, (0x100 + 0x4*i
));
341 for (i
= 0; i
< INTCPS_NR_MIR_REGS
; i
++)
342 intc_bank_write_reg(intc_context
[ind
].mir
[i
],
343 &irq_banks
[0], INTC_MIR0
+ (0x20 * i
));
345 /* MIRs are saved and restore with other PRCM registers */
348 void omap3_intc_suspend(void)
350 /* A pending interrupt would prevent OMAP from entering suspend */
354 void omap3_intc_prepare_idle(void)
357 * Disable autoidle as it can stall interrupt controller,
358 * cf. errata ID i540 for 3430 (all revisions up to 3.1.x)
360 intc_bank_write_reg(0, &irq_banks
[0], INTC_SYSCONFIG
);
363 void omap3_intc_resume_idle(void)
365 /* Re-enable autoidle */
366 intc_bank_write_reg(1, &irq_banks
[0], INTC_SYSCONFIG
);
369 asmlinkage
void __exception_irq_entry
omap3_intc_handle_irq(struct pt_regs
*regs
)
371 void __iomem
*base_addr
= OMAP3_IRQ_BASE
;
372 omap_intc_handle_irq(base_addr
, regs
);
374 #endif /* CONFIG_ARCH_OMAP3 */