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/*
* BK Id: SCCS/s.ppc8260_pic.c 1.5 05/17/01 18:14:21 cort
*/
#include <linux/stddef.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <asm/irq.h>
#include <asm/immap_8260.h>
#include <asm/mpc8260.h>
#include "ppc8260_pic.h"
/* The 8260 internal interrupt controller. It is usually
* the only interrupt controller.
* There are two 32-bit registers (high/low) for up to 64
* possible interrupts.
*
* Now, the fun starts.....Interrupt Numbers DO NOT MAP
* in a simple arithmetic fashion to mask or pending registers.
* That is, interrupt 4 does not map to bit position 4.
* We create two tables, indexed by vector number, to indicate
* which register to use and which bit in the register to use.
*/
static u_char irq_to_siureg[] = {
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0
};
static u_char irq_to_siubit[] = {
31, 16, 17, 18, 19, 20, 21, 22,
23, 24, 25, 26, 27, 28, 29, 30,
29, 30, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 31,
0, 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 14, 15,
15, 14, 13, 12, 11, 10, 9, 8,
7, 6, 5, 4, 3, 2, 1, 0
};
static void m8260_mask_irq(unsigned int irq_nr)
{
int bit, word;
volatile uint *simr;
bit = irq_to_siubit[irq_nr];
word = irq_to_siureg[irq_nr];
simr = &(immr->im_intctl.ic_simrh);
ppc_cached_irq_mask[word] &= ~(1 << (31 - bit));
simr[word] = ppc_cached_irq_mask[word];
}
static void m8260_unmask_irq(unsigned int irq_nr)
{
int bit, word;
volatile uint *simr;
bit = irq_to_siubit[irq_nr];
word = irq_to_siureg[irq_nr];
simr = &(immr->im_intctl.ic_simrh);
ppc_cached_irq_mask[word] |= (1 << (31 - bit));
simr[word] = ppc_cached_irq_mask[word];
}
static void m8260_mask_and_ack(unsigned int irq_nr)
{
int bit, word;
volatile uint *simr, *sipnr;
bit = irq_to_siubit[irq_nr];
word = irq_to_siureg[irq_nr];
simr = &(immr->im_intctl.ic_simrh);
sipnr = &(immr->im_intctl.ic_sipnrh);
ppc_cached_irq_mask[word] &= ~(1 << (31 - bit));
simr[word] = ppc_cached_irq_mask[word];
sipnr[word] = 1 << (31 - bit);
}
static void m8260_end_irq(unsigned int irq_nr)
{
int bit, word;
volatile uint *simr;
if (!(irq_desc[irq_nr].status & (IRQ_DISABLED|IRQ_INPROGRESS))) {
bit = irq_to_siubit[irq_nr];
word = irq_to_siureg[irq_nr];
simr = &(immr->im_intctl.ic_simrh);
ppc_cached_irq_mask[word] |= (1 << (31 - bit));
simr[word] = ppc_cached_irq_mask[word];
}
}
struct hw_interrupt_type ppc8260_pic = {
" 8260 SIU ",
NULL,
NULL,
m8260_unmask_irq,
m8260_mask_irq,
m8260_mask_and_ack,
m8260_end_irq,
0
};
int
m8260_get_irq(struct pt_regs *regs)
{
int irq;
unsigned long bits;
/* For MPC8260, read the SIVEC register and shift the bits down
* to get the irq number. */
bits = immr->im_intctl.ic_sivec;
irq = bits >> 26;
if (irq == 0)
return(-1);
#if 0
irq += ppc8260_pic.irq_offset;
#endif
return irq;
}
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