2 * Interrupt handling for INTC2-based IRQ.
4 * Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
5 * Copyright (C) 2005, 2006 Paul Mundt (lethal@linux-sh.org)
7 * May be copied or modified under the terms of the GNU General Public
8 * License. See linux/COPYING for more information.
10 * These are the "new Hitachi style" interrupts, as present on the
11 * Hitachi 7751, the STM ST40 STB1, SH7760, and SH7780.
13 #include <linux/kernel.h>
14 #include <linux/interrupt.h>
18 static inline struct intc2_desc *get_intc2_desc(unsigned int irq)
20 struct irq_chip *chip = get_irq_chip(irq);
21 return (void *)((char *)chip - offsetof(struct intc2_desc, chip));
24 static void disable_intc2_irq(unsigned int irq)
26 struct intc2_data *p = get_irq_chip_data(irq);
27 struct intc2_desc *d = get_intc2_desc(irq);
29 ctrl_outl(1 << p->msk_shift, d->msk_base + p->msk_offset +
30 (hard_smp_processor_id() * 4));
33 static void enable_intc2_irq(unsigned int irq)
35 struct intc2_data *p = get_irq_chip_data(irq);
36 struct intc2_desc *d = get_intc2_desc(irq);
38 ctrl_outl(1 << p->msk_shift, d->mskclr_base + p->msk_offset +
39 (hard_smp_processor_id() * 4));
43 * Setup an INTC2 style interrupt.
44 * NOTE: Unlike IPR interrupts, parameters are not shifted by this code,
45 * allowing the use of the numbers straight out of the datasheet.
47 * PIO1 which is INTPRI00[19,16] and INTMSK00[13]
50 * { 84, 0, 16, 0, 13 },
52 * in the intc2_data table.
54 void register_intc2_controller(struct intc2_desc *desc)
58 desc->chip.mask = disable_intc2_irq;
59 desc->chip.unmask = enable_intc2_irq;
60 desc->chip.mask_ack = disable_intc2_irq;
62 for (i = 0; i < desc->nr_irqs; i++) {
63 unsigned long ipr, flags;
64 struct intc2_data *p = desc->intc2_data + i;
66 disable_irq_nosync(p->irq);
68 if (desc->prio_base) {
69 /* Set the priority level */
70 local_irq_save(flags);
72 ipr = ctrl_inl(desc->prio_base + p->ipr_offset);
73 ipr &= ~(0xf << p->ipr_shift);
74 ipr |= p->priority << p->ipr_shift;
75 ctrl_outl(ipr, desc->prio_base + p->ipr_offset);
77 local_irq_restore(flags);
80 set_irq_chip_and_handler_name(p->irq, &desc->chip,
81 handle_level_irq, "level");
82 set_irq_chip_data(p->irq, p);
84 disable_intc2_irq(p->irq);