EPIC Vs OpenPIC (RFC)

[Dag Nygren]

BTW,

here is the corresponding routine for the xxxx_setup.c
in my port:

    /* Using MPC107(EPIC) means that the LinuxVector numbers start from 16
     * as 0-15 is reserved for the possible cascade
     * Remember that the LinuxVector of the first entry is used as an offset
     * for the Timer and IPI vectors */

static openpic_irq_def vg4_openpic_irq_defs[] __initdata = {
    /* PICirq, LinuxVector, Priority, Level/Edge, Polarity, CascadeAck */
    {  0, 16, 8, OP_IRQ_LEVEL, OP_IRQ_POS, &i8259_irq} ,    /* 8259 cascade */
    {  1, 17, 8, OP_IRQ_LEVEL, OP_IRQ_NEG, NULL      } ,    /* INT_PCI_INTA */
    {  2, 18, 8, OP_IRQ_LEVEL, OP_IRQ_NEG, NULL      } ,    /* INT_PCI_INTB */
    {  3, 19, 8, OP_IRQ_LEVEL, OP_IRQ_NEG, NULL      } ,    /* INT_PCI_INTC */
    {  4, 20, 8, OP_IRQ_LEVEL, OP_IRQ_NEG, NULL      } ,    /* INT_PCI_INTD */
    { -1, -1, 8, OP_IRQ_LEVEL, OP_IRQ_NEG, NULL      }      /* End of table
marker */
};

ALLOC_OPENPIC_DEF(vg4_openpic_def);

static void __init
vg4_init_IRQ(void)
{
    int vec;

    vg4_openpic_def.IRQdef    = vg4_openpic_irq_defs;

    /* The int:s behind the OpenPIC in MPC107 */

    openpic_init(&vg4_openpic_def);

    /* These are the ints (0-15) behind the 8259 in the ALI chip */
    for ( vec = 0 ; vec < NUM_8259_INTERRUPTS  ; vec++ )
        irq_desc[vec].handler = &i8259_pic;

    i8259_init();
}


BRGDS

Dag


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