86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
/*
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* Interrupt handling for INTC2-based IRQ.
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*
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* Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
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* Copyright (C) 2005, 2006 Paul Mundt (lethal@linux-sh.org)
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*
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* May be copied or modified under the terms of the GNU General Public
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* License. See linux/COPYING for more information.
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*
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* These are the "new Hitachi style" interrupts, as present on the
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* Hitachi 7751, the STM ST40 STB1, SH7760, and SH7780.
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*/
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#if defined(CONFIG_CPU_SUBTYPE_SH7760)
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#define INTC2_BASE 0xfe080000
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#define INTC2_INTMSK (INTC2_BASE + 0x40)
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#define INTC2_INTMSKCLR (INTC2_BASE + 0x60)
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#elif defined(CONFIG_CPU_SUBTYPE_SH7780) || \
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defined(CONFIG_CPU_SUBTYPE_SH7785)
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#define INTC2_BASE 0xffd40000
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#define INTC2_INTMSK (INTC2_BASE + 0x38)
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#define INTC2_INTMSKCLR (INTC2_BASE + 0x3c)
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#endif
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static void disable_intc2_irq(unsigned int irq)
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{
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struct intc2_data *p = get_irq_chip_data(irq);
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ctrl_outl(1 << p->msk_shift, INTC2_INTMSK + p->msk_offset);
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}
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static void enable_intc2_irq(unsigned int irq)
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{
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struct intc2_data *p = get_irq_chip_data(irq);
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ctrl_outl(1 << p->msk_shift, INTC2_INTMSKCLR + p->msk_offset);
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}
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static struct irq_chip intc2_irq_chip = {
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.name = "INTC2",
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.mask = disable_intc2_irq,
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.unmask = enable_intc2_irq,
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.mask_ack = disable_intc2_irq,
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};
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/*
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* Setup an INTC2 style interrupt.
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* NOTE: Unlike IPR interrupts, parameters are not shifted by this code,
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* allowing the use of the numbers straight out of the datasheet.
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* For example:
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* PIO1 which is INTPRI00[19,16] and INTMSK00[13]
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* would be: ^ ^ ^ ^
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* | | | |
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* { 84, 0, 16, 0, 13 },
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*
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* in the intc2_data table.
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*/
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void make_intc2_irq(struct intc2_data *table, unsigned int nr_irqs)
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{
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int i;
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for (i = 0; i < nr_irqs; i++) {
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unsigned long ipr, flags;
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struct intc2_data *p = table + i;
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disable_irq_nosync(p->irq);
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/* Set the priority level */
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local_irq_save(flags);
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ipr = ctrl_inl(INTC2_BASE + p->ipr_offset);
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ipr &= ~(0xf << p->ipr_shift);
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ipr |= p->priority << p->ipr_shift;
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ctrl_outl(ipr, INTC2_BASE + p->ipr_offset);
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local_irq_restore(flags);
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set_irq_chip_and_handler_name(p->irq, &intc2_irq_chip,
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handle_level_irq, "level");
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set_irq_chip_data(p->irq, p);
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enable_intc2_irq(p->irq);
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}
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}
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