msp_irq.c

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/*
 * IRQ vector handles
 *
 * Copyright (C) 1995, 1996, 1997, 2003 by Ralf Baechle
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/time.h>

#include <asm/irq_cpu.h>

#include <msp_int.h>

/* SLP bases systems */
extern void msp_slp_irq_init(void);
extern void msp_slp_irq_dispatch(void);

/* CIC based systems */
extern void msp_cic_irq_init(void);
extern void msp_cic_irq_dispatch(void);

/* VSMP support init */
extern void msp_vsmp_int_init(void);

/* vectored interrupt implementation */

/* SW0/1 interrupts are used for SMP/SMTC */
static inline void mac0_int_dispatch(void) { do_IRQ(MSP_INT_MAC0); }
static inline void mac1_int_dispatch(void) { do_IRQ(MSP_INT_MAC1); }
static inline void mac2_int_dispatch(void) { do_IRQ(MSP_INT_SAR); }
static inline void usb_int_dispatch(void)  { do_IRQ(MSP_INT_USB);  }
static inline void sec_int_dispatch(void)  { do_IRQ(MSP_INT_SEC);  }

/*
 * The PMC-Sierra MSP interrupts are arranged in a 3 level cascaded
 * hierarchical system.  The first level are the direct MIPS interrupts
 * and are assigned the interrupt range 0-7.  The second level is the SLM
 * interrupt controller and is assigned the range 8-39.  The third level
 * comprises the Peripherial block, the PCI block, the PCI MSI block and
 * the SLP.  The PCI interrupts and the SLP errors are handled by the
 * relevant subsystems so the core interrupt code needs only concern
 * itself with the Peripheral block.  These are assigned interrupts in
 * the range 40-71.
 */

asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
{
    u32 pending;

    pending = read_c0_status() & read_c0_cause();

    /*
     * jump to the correct interrupt routine
     * These are arranged in priority order and the timer
     * comes first!
     */

#ifdef CONFIG_IRQ_MSP_CIC   /* break out the CIC stuff for now */
    if (pending & C_IRQ4)   /* do the peripherals first, that's the timer */
        msp_cic_irq_dispatch();

    else if (pending & C_IRQ0)
        do_IRQ(MSP_INT_MAC0);

    else if (pending & C_IRQ1)
        do_IRQ(MSP_INT_MAC1);

    else if (pending & C_IRQ2)
        do_IRQ(MSP_INT_USB);

    else if (pending & C_IRQ3)
        do_IRQ(MSP_INT_SAR);

    else if (pending & C_IRQ5)
        do_IRQ(MSP_INT_SEC);

#else
    if (pending & C_IRQ5)
        do_IRQ(MSP_INT_TIMER);

    else if (pending & C_IRQ0)
        do_IRQ(MSP_INT_MAC0);

    else if (pending & C_IRQ1)
        do_IRQ(MSP_INT_MAC1);

    else if (pending & C_IRQ3)
        do_IRQ(MSP_INT_VE);

    else if (pending & C_IRQ4)
        msp_slp_irq_dispatch();
#endif

    else if (pending & C_SW0)   /* do software after hardware */
        do_IRQ(MSP_INT_SW0);

    else if (pending & C_SW1)
        do_IRQ(MSP_INT_SW1);
}

static struct irqaction cic_cascade_msp = {
    .handler = no_action,
    .name    = "MSP CIC cascade",
    .flags   = IRQF_NO_THREAD,
};

static struct irqaction per_cascade_msp = {
    .handler = no_action,
    .name    = "MSP PER cascade",
    .flags   = IRQF_NO_THREAD,
};

void __init arch_init_irq(void)
{
    /* assume we'll be using vectored interrupt mode except in UP mode*/
#ifdef CONFIG_MIPS_MT
    BUG_ON(!cpu_has_vint);
#endif
    /* initialize the 1st-level CPU based interrupt controller */
    mips_cpu_irq_init();

#ifdef CONFIG_IRQ_MSP_CIC
    msp_cic_irq_init();
#ifdef CONFIG_MIPS_MT
    set_vi_handler(MSP_INT_CIC, msp_cic_irq_dispatch);
    set_vi_handler(MSP_INT_MAC0, mac0_int_dispatch);
    set_vi_handler(MSP_INT_MAC1, mac1_int_dispatch);
    set_vi_handler(MSP_INT_SAR, mac2_int_dispatch);
    set_vi_handler(MSP_INT_USB, usb_int_dispatch);
    set_vi_handler(MSP_INT_SEC, sec_int_dispatch);
#ifdef CONFIG_MIPS_MT_SMP
    msp_vsmp_int_init();
#elif defined CONFIG_MIPS_MT_SMTC
    /*Set hwmask for all platform devices */
    irq_hwmask[MSP_INT_MAC0] = C_IRQ0;
    irq_hwmask[MSP_INT_MAC1] = C_IRQ1;
    irq_hwmask[MSP_INT_USB] = C_IRQ2;
    irq_hwmask[MSP_INT_SAR] = C_IRQ3;
    irq_hwmask[MSP_INT_SEC] = C_IRQ5;

#endif  /* CONFIG_MIPS_MT_SMP */
#endif  /* CONFIG_MIPS_MT */
    /* setup the cascaded interrupts */
    setup_irq(MSP_INT_CIC, &cic_cascade_msp);
    setup_irq(MSP_INT_PER, &per_cascade_msp);

#else
    /* setup the 2nd-level SLP register based interrupt controller */
    /* VSMP /SMTC support support is not enabled for SLP */
    msp_slp_irq_init();

    /* setup the cascaded SLP/PER interrupts */
    setup_irq(MSP_INT_SLP, &cic_cascade_msp);
    setup_irq(MSP_INT_PER, &per_cascade_msp);
#endif
}