2 * Interrupt handling for IPR-based IRQ.
4 * Copyright (C) 1999 Niibe Yutaka & Takeshi Yaegashi
5 * Copyright (C) 2000 Kazumoto Kojima
6 * Copyright (C) 2003 Takashi Kusuda <kusuda-takashi@hitachi-ul.co.jp>
7 * Copyright (C) 2006 Paul Mundt
10 * On-chip supporting modules (TMU, RTC, etc.).
11 * On-chip supporting modules for SH7709/SH7709A/SH7729.
12 * Hitachi SolutionEngine external I/O:
13 * MS7709SE01, MS7709ASE01, and MS7750SE01
15 * This file is subject to the terms and conditions of the GNU General Public
16 * License. See the file "COPYING" in the main directory of this archive
19 #include <linux/init.h>
20 #include <linux/irq.h>
21 #include <linux/module.h>
23 #include <linux/interrupt.h>
24 #include <linux/topology.h>
26 static inline struct ipr_desc
*get_ipr_desc(unsigned int irq
)
28 struct irq_chip
*chip
= get_irq_chip(irq
);
29 return (void *)((char *)chip
- offsetof(struct ipr_desc
, chip
));
32 static void disable_ipr_irq(unsigned int irq
)
34 struct ipr_data
*p
= get_irq_chip_data(irq
);
35 unsigned long addr
= get_ipr_desc(irq
)->ipr_offsets
[p
->ipr_idx
];
36 /* Set the priority in IPR to 0 */
37 __raw_writew(__raw_readw(addr
) & (0xffff ^ (0xf << p
->shift
)), addr
);
40 static void enable_ipr_irq(unsigned int irq
)
42 struct ipr_data
*p
= get_irq_chip_data(irq
);
43 unsigned long addr
= get_ipr_desc(irq
)->ipr_offsets
[p
->ipr_idx
];
44 /* Set priority in IPR back to original value */
45 __raw_writew(__raw_readw(addr
) | (p
->priority
<< p
->shift
), addr
);
49 * The shift value is now the number of bits to shift, not the number of
50 * bits/4. This is to make it easier to read the value directly from the
51 * datasheets. The IPR address is calculated using the ipr_offset table.
53 void register_ipr_controller(struct ipr_desc
*desc
)
57 desc
->chip
.mask
= disable_ipr_irq
;
58 desc
->chip
.unmask
= enable_ipr_irq
;
59 desc
->chip
.mask_ack
= disable_ipr_irq
;
61 for (i
= 0; i
< desc
->nr_irqs
; i
++) {
62 struct ipr_data
*p
= desc
->ipr_data
+ i
;
63 struct irq_desc
*irq_desc
;
65 BUG_ON(p
->ipr_idx
>= desc
->nr_offsets
);
66 BUG_ON(!desc
->ipr_offsets
[p
->ipr_idx
]);
68 irq_desc
= irq_to_desc_alloc_node(p
->irq
, numa_node_id());
69 if (unlikely(!irq_desc
)) {
70 printk(KERN_INFO
"can not get irq_desc for %d\n",
75 disable_irq_nosync(p
->irq
);
76 set_irq_chip_and_handler_name(p
->irq
, &desc
->chip
,
77 handle_level_irq
, "level");
78 set_irq_chip_data(p
->irq
, p
);
79 disable_ipr_irq(p
->irq
);
82 EXPORT_SYMBOL(register_ipr_controller
);
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