CoCalc -- ip22-int.c

GitHub Repository: awilliam/linux-vfio
Path: blob/master/arch/mips/sgi-ip22/ip22-int.c
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/*
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 * ip22-int.c: Routines for generic manipulation of the INT[23] ASIC
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 *             found on INDY and Indigo2 workstations.
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 *
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 * Copyright (C) 1996 David S. Miller ([email protected])
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 * Copyright (C) 1997, 1998 Ralf Baechle ([email protected])
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 * Copyright (C) 1999 Andrew R. Baker ([email protected])
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 *                    - Indigo2 changes
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 *                    - Interrupt handling fixes
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 * Copyright (C) 2001, 2003 Ladislav Michl ([email protected])
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 */
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/kernel_stat.h>
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#include <linux/interrupt.h>
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#include <linux/ftrace.h>
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#include <asm/irq_cpu.h>
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#include <asm/sgi/hpc3.h>
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#include <asm/sgi/ip22.h>
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/* So far nothing hangs here */
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#undef USE_LIO3_IRQ
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struct sgint_regs *sgint;
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static char lc0msk_to_irqnr[256];
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static char lc1msk_to_irqnr[256];
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static char lc2msk_to_irqnr[256];
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static char lc3msk_to_irqnr[256];
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extern int ip22_eisa_init(void);
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static void enable_local0_irq(struct irq_data *d)
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{
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	/* don't allow mappable interrupt to be enabled from setup_irq,
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	 * we have our own way to do so */
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	if (d->irq != SGI_MAP_0_IRQ)
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		sgint->imask0 |= (1 << (d->irq - SGINT_LOCAL0));
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}
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static void disable_local0_irq(struct irq_data *d)
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{
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	sgint->imask0 &= ~(1 << (d->irq - SGINT_LOCAL0));
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}
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static struct irq_chip ip22_local0_irq_type = {
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	.name		= "IP22 local 0",
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	.irq_mask	= disable_local0_irq,
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	.irq_unmask	= enable_local0_irq,
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};
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static void enable_local1_irq(struct irq_data *d)
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{
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	/* don't allow mappable interrupt to be enabled from setup_irq,
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	 * we have our own way to do so */
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	if (d->irq != SGI_MAP_1_IRQ)
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		sgint->imask1 |= (1 << (d->irq - SGINT_LOCAL1));
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}
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static void disable_local1_irq(struct irq_data *d)
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{
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	sgint->imask1 &= ~(1 << (d->irq - SGINT_LOCAL1));
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}
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static struct irq_chip ip22_local1_irq_type = {
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	.name		= "IP22 local 1",
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	.irq_mask	= disable_local1_irq,
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	.irq_unmask	= enable_local1_irq,
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};
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static void enable_local2_irq(struct irq_data *d)
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{
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	sgint->imask0 |= (1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
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	sgint->cmeimask0 |= (1 << (d->irq - SGINT_LOCAL2));
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}
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static void disable_local2_irq(struct irq_data *d)
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{
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	sgint->cmeimask0 &= ~(1 << (d->irq - SGINT_LOCAL2));
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	if (!sgint->cmeimask0)
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		sgint->imask0 &= ~(1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
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}
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static struct irq_chip ip22_local2_irq_type = {
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	.name		= "IP22 local 2",
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	.irq_mask	= disable_local2_irq,
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	.irq_unmask	= enable_local2_irq,
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};
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static void enable_local3_irq(struct irq_data *d)
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{
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	sgint->imask1 |= (1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
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	sgint->cmeimask1 |= (1 << (d->irq - SGINT_LOCAL3));
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}
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static void disable_local3_irq(struct irq_data *d)
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{
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	sgint->cmeimask1 &= ~(1 << (d->irq - SGINT_LOCAL3));
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	if (!sgint->cmeimask1)
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		sgint->imask1 &= ~(1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
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}
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static struct irq_chip ip22_local3_irq_type = {
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	.name		= "IP22 local 3",
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	.irq_mask	= disable_local3_irq,
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	.irq_unmask	= enable_local3_irq,
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};
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static void indy_local0_irqdispatch(void)
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{
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	u8 mask = sgint->istat0 & sgint->imask0;
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	u8 mask2;
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	int irq;
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	if (mask & SGINT_ISTAT0_LIO2) {
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		mask2 = sgint->vmeistat & sgint->cmeimask0;
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		irq = lc2msk_to_irqnr[mask2];
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	} else
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		irq = lc0msk_to_irqnr[mask];
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	/* if irq == 0, then the interrupt has already been cleared */
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	if (irq)
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		do_IRQ(irq);
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}
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static void indy_local1_irqdispatch(void)
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{
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	u8 mask = sgint->istat1 & sgint->imask1;
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	u8 mask2;
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	int irq;
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	if (mask & SGINT_ISTAT1_LIO3) {
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		mask2 = sgint->vmeistat & sgint->cmeimask1;
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		irq = lc3msk_to_irqnr[mask2];
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	} else
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		irq = lc1msk_to_irqnr[mask];
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	/* if irq == 0, then the interrupt has already been cleared */
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	if (irq)
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		do_IRQ(irq);
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}
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extern void ip22_be_interrupt(int irq);
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static void __irq_entry indy_buserror_irq(void)
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{
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	int irq = SGI_BUSERR_IRQ;
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	irq_enter();
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	kstat_incr_irqs_this_cpu(irq, irq_to_desc(irq));
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	ip22_be_interrupt(irq);
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	irq_exit();
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}
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static struct irqaction local0_cascade = {
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	.handler	= no_action,
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	.flags		= IRQF_DISABLED,
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	.name		= "local0 cascade",
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};
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static struct irqaction local1_cascade = {
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	.handler	= no_action,
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	.flags		= IRQF_DISABLED,
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	.name		= "local1 cascade",
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};
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static struct irqaction buserr = {
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	.handler	= no_action,
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	.flags		= IRQF_DISABLED,
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	.name		= "Bus Error",
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};
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static struct irqaction map0_cascade = {
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	.handler	= no_action,
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	.flags		= IRQF_DISABLED,
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	.name		= "mapable0 cascade",
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};
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#ifdef USE_LIO3_IRQ
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static struct irqaction map1_cascade = {
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	.handler	= no_action,
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	.flags		= IRQF_DISABLED,
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	.name		= "mapable1 cascade",
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};
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#define SGI_INTERRUPTS	SGINT_END
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#else
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#define SGI_INTERRUPTS	SGINT_LOCAL3
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#endif
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extern void indy_8254timer_irq(void);
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/*
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 * IRQs on the INDY look basically (barring software IRQs which we don't use
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 * at all) like:
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 *
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 *	MIPS IRQ	Source
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 *      --------        ------
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 *             0	Software (ignored)
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 *             1        Software (ignored)
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 *             2        Local IRQ level zero
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 *             3        Local IRQ level one
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 *             4        8254 Timer zero
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 *             5        8254 Timer one
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 *             6        Bus Error
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 *             7        R4k timer (what we use)
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 *
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 * We handle the IRQ according to _our_ priority which is:
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 *
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 * Highest ----     R4k Timer
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 *                  Local IRQ zero
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 *                  Local IRQ one
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 *                  Bus Error
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 *                  8254 Timer zero
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 * Lowest  ----     8254 Timer one
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 *
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 * then we just return, if multiple IRQs are pending then we will just take
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 * another exception, big deal.
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 */
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asmlinkage void plat_irq_dispatch(void)
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{
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	unsigned int pending = read_c0_status() & read_c0_cause();
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	/*
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	 * First we check for r4k counter/timer IRQ.
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	 */
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	if (pending & CAUSEF_IP7)
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		do_IRQ(SGI_TIMER_IRQ);
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	else if (pending & CAUSEF_IP2)
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		indy_local0_irqdispatch();
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	else if (pending & CAUSEF_IP3)
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		indy_local1_irqdispatch();
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	else if (pending & CAUSEF_IP6)
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		indy_buserror_irq();
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	else if (pending & (CAUSEF_IP4 | CAUSEF_IP5))
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		indy_8254timer_irq();
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}
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void __init arch_init_irq(void)
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{
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	int i;
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	/* Init local mask --> irq tables. */
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	for (i = 0; i < 256; i++) {
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		if (i & 0x80) {
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			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 7;
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			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 7;
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			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 7;
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			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 7;
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		} else if (i & 0x40) {
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			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 6;
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			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 6;
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			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 6;
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			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 6;
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		} else if (i & 0x20) {
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			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 5;
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			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 5;
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			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 5;
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			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 5;
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		} else if (i & 0x10) {
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			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 4;
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			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 4;
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			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 4;
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			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 4;
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		} else if (i & 0x08) {
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			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 3;
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			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 3;
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			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 3;
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			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 3;
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		} else if (i & 0x04) {
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			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 2;
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			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 2;
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			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 2;
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			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 2;
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		} else if (i & 0x02) {
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			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 1;
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			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 1;
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			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 1;
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			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 1;
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		} else if (i & 0x01) {
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			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 0;
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			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 0;
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			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 0;
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			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 0;
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		} else {
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			lc0msk_to_irqnr[i] = 0;
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			lc1msk_to_irqnr[i] = 0;
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			lc2msk_to_irqnr[i] = 0;
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			lc3msk_to_irqnr[i] = 0;
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		}
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	}
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	/* Mask out all interrupts. */
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	sgint->imask0 = 0;
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	sgint->imask1 = 0;
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	sgint->cmeimask0 = 0;
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	sgint->cmeimask1 = 0;
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	/* init CPU irqs */
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	mips_cpu_irq_init();
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	for (i = SGINT_LOCAL0; i < SGI_INTERRUPTS; i++) {
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		struct irq_chip *handler;
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		if (i < SGINT_LOCAL1)
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			handler		= &ip22_local0_irq_type;
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		else if (i < SGINT_LOCAL2)
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			handler		= &ip22_local1_irq_type;
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		else if (i < SGINT_LOCAL3)
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			handler		= &ip22_local2_irq_type;
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		else
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			handler		= &ip22_local3_irq_type;
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		irq_set_chip_and_handler(i, handler, handle_level_irq);
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	}
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	/* vector handler. this register the IRQ as non-sharable */
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	setup_irq(SGI_LOCAL_0_IRQ, &local0_cascade);
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	setup_irq(SGI_LOCAL_1_IRQ, &local1_cascade);
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	setup_irq(SGI_BUSERR_IRQ, &buserr);
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	/* cascade in cascade. i love Indy ;-) */
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	setup_irq(SGI_MAP_0_IRQ, &map0_cascade);
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#ifdef USE_LIO3_IRQ
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	setup_irq(SGI_MAP_1_IRQ, &map1_cascade);
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#endif
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#ifdef CONFIG_EISA
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	if (ip22_is_fullhouse())	/* Only Indigo-2 has EISA stuff */
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		ip22_eisa_init();
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#endif
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}
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