1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Interrupt handling for IPR-based IRQ.
4 *
5 * Copyright (C) 1999 Niibe Yutaka & Takeshi Yaegashi
6 * Copyright (C) 2000 Kazumoto Kojima
7 * Copyright (C) 2003 Takashi Kusuda <kusuda-takashi@hitachi-ul.co.jp>
8 * Copyright (C) 2006 Paul Mundt
9 *
10 * Supported system:
11 * On-chip supporting modules (TMU, RTC, etc.).
12 * On-chip supporting modules for SH7709/SH7709A/SH7729.
13 * Hitachi SolutionEngine external I/O:
14 * MS7709SE01, MS7709ASE01, and MS7750SE01
15 */
16 #include <linux/init.h>
17 #include <linux/interrupt.h>
18 #include <linux/io.h>
19 #include <linux/irq.h>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/topology.h>
23
24 static inline struct ipr_desc *get_ipr_desc(struct irq_data *data)
25 {
26 struct irq_chip *chip = irq_data_get_irq_chip(data);
27 return container_of(chip, struct ipr_desc, chip);
28 }
29
30 static void disable_ipr_irq(struct irq_data *data)
31 {
32 struct ipr_data *p = irq_data_get_irq_chip_data(data);
33 unsigned long addr = get_ipr_desc(data)->ipr_offsets[p->ipr_idx];
34 /* Set the priority in IPR to 0 */
35 __raw_writew(__raw_readw(addr) & (0xffff ^ (0xf << p->shift)), addr);
36 (void)__raw_readw(addr); /* Read back to flush write posting */
37 }
38
39 static void enable_ipr_irq(struct irq_data *data)
40 {
41 struct ipr_data *p = irq_data_get_irq_chip_data(data);
42 unsigned long addr = get_ipr_desc(data)->ipr_offsets[p->ipr_idx];
43 /* Set priority in IPR back to original value */
44 __raw_writew(__raw_readw(addr) | (p->priority << p->shift), addr);
45 }
46
47 /*
48 * The shift value is now the number of bits to shift, not the number of
49 * bits/4. This is to make it easier to read the value directly from the
50 * datasheets. The IPR address is calculated using the ipr_offset table.
51 */
52 void register_ipr_controller(struct ipr_desc *desc)
53 {
54 int i;
55
56 desc->chip.irq_mask = disable_ipr_irq;
57 desc->chip.irq_unmask = enable_ipr_irq;
58
59 for (i = 0; i < desc->nr_irqs; i++) {
60 struct ipr_data *p = desc->ipr_data + i;
61 int res;
62
63 BUG_ON(p->ipr_idx >= desc->nr_offsets);
64 BUG_ON(!desc->ipr_offsets[p->ipr_idx]);
65
66 res = irq_alloc_desc_at(p->irq, numa_node_id());
67 if (unlikely(res != p->irq && res != -EEXIST)) {
68 printk(KERN_INFO "can not get irq_desc for %d\n",
69 p->irq);
70 continue;
71 }
72
73 disable_irq_nosync(p->irq);
74 irq_set_chip_and_handler_name(p->irq, &desc->chip,
75 handle_level_irq, "level");
76 irq_set_chip_data(p->irq, p);
77 disable_ipr_irq(irq_get_irq_data(p->irq));
78 }
79 }
80 EXPORT_SYMBOL(register_ipr_controller);
81
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