1/*
2 * Interrupt handling for INTC2-based IRQ.
3 *
4 * Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
5 * Copyright (C) 2005, 2006 Paul Mundt (lethal@linux-sh.org)
6 *
7 * May be copied or modified under the terms of the GNU General Public
8 * License.  See linux/COPYING for more information.
9 *
10 * These are the "new Hitachi style" interrupts, as present on the
11 * Hitachi 7751, the STM ST40 STB1, SH7760, and SH7780.
12 */
13#include <linux/kernel.h>
14#include <linux/interrupt.h>
15#include <linux/io.h>
16
17#if defined(CONFIG_CPU_SUBTYPE_SH7760)
18#define INTC2_BASE	0xfe080000
19#define INTC2_INTMSK	(INTC2_BASE + 0x40)
20#define INTC2_INTMSKCLR	(INTC2_BASE + 0x60)
21#elif defined(CONFIG_CPU_SUBTYPE_SH7780) || \
22      defined(CONFIG_CPU_SUBTYPE_SH7785)
23#define INTC2_BASE	0xffd40000
24#define INTC2_INTMSK	(INTC2_BASE + 0x38)
25#define INTC2_INTMSKCLR	(INTC2_BASE + 0x3c)
26#endif
27
28static void disable_intc2_irq(unsigned int irq)
29{
30	struct intc2_data *p = get_irq_chip_data(irq);
31	ctrl_outl(1 << p->msk_shift, INTC2_INTMSK + p->msk_offset);
32}
33
34static void enable_intc2_irq(unsigned int irq)
35{
36	struct intc2_data *p = get_irq_chip_data(irq);
37	ctrl_outl(1 << p->msk_shift, INTC2_INTMSKCLR + p->msk_offset);
38}
39
40static struct irq_chip intc2_irq_chip = {
41	.name		= "INTC2",
42	.mask		= disable_intc2_irq,
43	.unmask		= enable_intc2_irq,
44	.mask_ack	= disable_intc2_irq,
45};
46
47/*
48 * Setup an INTC2 style interrupt.
49 * NOTE: Unlike IPR interrupts, parameters are not shifted by this code,
50 * allowing the use of the numbers straight out of the datasheet.
51 * For example:
52 *    PIO1 which is INTPRI00[19,16] and INTMSK00[13]
53 * would be:               ^     ^             ^  ^
54 *                         |     |             |  |
55 *     { 84,		   0,   16,            0, 13 },
56 *
57 * in the intc2_data table.
58 */
59void make_intc2_irq(struct intc2_data *table, unsigned int nr_irqs)
60{
61	int i;
62
63	for (i = 0; i < nr_irqs; i++) {
64		unsigned long ipr, flags;
65		struct intc2_data *p = table + i;
66
67		disable_irq_nosync(p->irq);
68
69		/* Set the priority level */
70		local_irq_save(flags);
71
72		ipr = ctrl_inl(INTC2_BASE + p->ipr_offset);
73		ipr &= ~(0xf << p->ipr_shift);
74		ipr |= p->priority << p->ipr_shift;
75		ctrl_outl(ipr, INTC2_BASE + p->ipr_offset);
76
77		local_irq_restore(flags);
78
79		set_irq_chip_and_handler_name(p->irq, &intc2_irq_chip,
80					      handle_level_irq, "level");
81		set_irq_chip_data(p->irq, p);
82
83		enable_intc2_irq(p->irq);
84	}
85}
86