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/*
* Programmable Interrupt Controller functions for the Freescale MPC52xx
* embedded CPU.
*
*
* Maintainer : Sylvain Munaut <tnt@246tNt.com>
*
* Based on (well, mostly copied from) the code from the 2.4 kernel by
* Dale Farnsworth <dfarnsworth@mvista.com> and Kent Borg.
*
* Copyright (C) 2004 Sylvain Munaut <tnt@246tNt.com>
* Copyright (C) 2003 Montavista Software, Inc
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#include <linux/stddef.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/stddef.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/mpc52xx.h>
static struct mpc52xx_intr __iomem *intr;
static struct mpc52xx_sdma __iomem *sdma;
static void
mpc52xx_ic_disable(unsigned int irq)
{
u32 val;
if (irq == MPC52xx_IRQ0) {
val = in_be32(&intr->ctrl);
val &= ~(1 << 11);
out_be32(&intr->ctrl, val);
}
else if (irq < MPC52xx_IRQ1) {
BUG();
}
else if (irq <= MPC52xx_IRQ3) {
val = in_be32(&intr->ctrl);
val &= ~(1 << (10 - (irq - MPC52xx_IRQ1)));
out_be32(&intr->ctrl, val);
}
else if (irq < MPC52xx_SDMA_IRQ_BASE) {
val = in_be32(&intr->main_mask);
val |= 1 << (16 - (irq - MPC52xx_MAIN_IRQ_BASE));
out_be32(&intr->main_mask, val);
}
else if (irq < MPC52xx_PERP_IRQ_BASE) {
val = in_be32(&sdma->IntMask);
val |= 1 << (irq - MPC52xx_SDMA_IRQ_BASE);
out_be32(&sdma->IntMask, val);
}
else {
val = in_be32(&intr->per_mask);
val |= 1 << (31 - (irq - MPC52xx_PERP_IRQ_BASE));
out_be32(&intr->per_mask, val);
}
}
static void
mpc52xx_ic_enable(unsigned int irq)
{
u32 val;
if (irq == MPC52xx_IRQ0) {
val = in_be32(&intr->ctrl);
val |= 1 << 11;
out_be32(&intr->ctrl, val);
}
else if (irq < MPC52xx_IRQ1) {
BUG();
}
else if (irq <= MPC52xx_IRQ3) {
val = in_be32(&intr->ctrl);
val |= 1 << (10 - (irq - MPC52xx_IRQ1));
out_be32(&intr->ctrl, val);
}
else if (irq < MPC52xx_SDMA_IRQ_BASE) {
val = in_be32(&intr->main_mask);
val &= ~(1 << (16 - (irq - MPC52xx_MAIN_IRQ_BASE)));
out_be32(&intr->main_mask, val);
}
else if (irq < MPC52xx_PERP_IRQ_BASE) {
val = in_be32(&sdma->IntMask);
val &= ~(1 << (irq - MPC52xx_SDMA_IRQ_BASE));
out_be32(&sdma->IntMask, val);
}
else {
val = in_be32(&intr->per_mask);
val &= ~(1 << (31 - (irq - MPC52xx_PERP_IRQ_BASE)));
out_be32(&intr->per_mask, val);
}
}
static void
mpc52xx_ic_ack(unsigned int irq)
{
u32 val;
/*
* Only some irqs are reset here, others in interrupting hardware.
*/
switch (irq) {
case MPC52xx_IRQ0:
val = in_be32(&intr->ctrl);
val |= 0x08000000;
out_be32(&intr->ctrl, val);
break;
case MPC52xx_CCS_IRQ:
val = in_be32(&intr->enc_status);
val |= 0x00000400;
out_be32(&intr->enc_status, val);
break;
case MPC52xx_IRQ1:
val = in_be32(&intr->ctrl);
val |= 0x04000000;
out_be32(&intr->ctrl, val);
break;
case MPC52xx_IRQ2:
val = in_be32(&intr->ctrl);
val |= 0x02000000;
out_be32(&intr->ctrl, val);
break;
case MPC52xx_IRQ3:
val = in_be32(&intr->ctrl);
val |= 0x01000000;
out_be32(&intr->ctrl, val);
break;
default:
if (irq >= MPC52xx_SDMA_IRQ_BASE
&& irq < (MPC52xx_SDMA_IRQ_BASE + MPC52xx_SDMA_IRQ_NUM)) {
out_be32(&sdma->IntPend,
1 << (irq - MPC52xx_SDMA_IRQ_BASE));
}
break;
}
}
static void
mpc52xx_ic_disable_and_ack(unsigned int irq)
{
mpc52xx_ic_disable(irq);
mpc52xx_ic_ack(irq);
}
static void
mpc52xx_ic_end(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
mpc52xx_ic_enable(irq);
}
static struct hw_interrupt_type mpc52xx_ic = {
.typename = " MPC52xx ",
.enable = mpc52xx_ic_enable,
.disable = mpc52xx_ic_disable,
.ack = mpc52xx_ic_disable_and_ack,
.end = mpc52xx_ic_end,
};
void __init
mpc52xx_init_irq(void)
{
int i;
u32 intr_ctrl;
/* Remap the necessary zones */
intr = ioremap(MPC52xx_PA(MPC52xx_INTR_OFFSET), MPC52xx_INTR_SIZE);
sdma = ioremap(MPC52xx_PA(MPC52xx_SDMA_OFFSET), MPC52xx_SDMA_SIZE);
if ((intr==NULL) || (sdma==NULL))
panic("Can't ioremap PIC/SDMA register for init_irq !");
/* Disable all interrupt sources. */
out_be32(&sdma->IntPend, 0xffffffff); /* 1 means clear pending */
out_be32(&sdma->IntMask, 0xffffffff); /* 1 means disabled */
out_be32(&intr->per_mask, 0x7ffffc00); /* 1 means disabled */
out_be32(&intr->main_mask, 0x00010fff); /* 1 means disabled */
intr_ctrl = in_be32(&intr->ctrl);
intr_ctrl &= 0x00ff0000; /* Keeps IRQ[0-3] config */
intr_ctrl |= 0x0f000000 | /* clear IRQ 0-3 */
0x00001000 | /* MEE master external enable */
0x00000000 | /* 0 means disable IRQ 0-3 */
0x00000001; /* CEb route critical normally */
out_be32(&intr->ctrl, intr_ctrl);
/* Zero a bunch of the priority settings. */
out_be32(&intr->per_pri1, 0);
out_be32(&intr->per_pri2, 0);
out_be32(&intr->per_pri3, 0);
out_be32(&intr->main_pri1, 0);
out_be32(&intr->main_pri2, 0);
/* Initialize irq_desc[i].handler's with mpc52xx_ic. */
for (i = 0; i < NR_IRQS; i++) {
irq_desc[i].handler = &mpc52xx_ic;
irq_desc[i].status = IRQ_LEVEL;
}
#define IRQn_MODE(intr_ctrl,irq) (((intr_ctrl) >> (22-(i<<1))) & 0x03)
for (i=0 ; i<4 ; i++) {
int mode;
mode = IRQn_MODE(intr_ctrl,i);
if ((mode == 0x1) || (mode == 0x2))
irq_desc[i?MPC52xx_IRQ1+i-1:MPC52xx_IRQ0].status = 0;
}
}
int
mpc52xx_get_irq(struct pt_regs *regs)
{
u32 status;
int irq = -1;
status = in_be32(&intr->enc_status);
if (status & 0x00000400) { /* critical */
irq = (status >> 8) & 0x3;
if (irq == 2) /* high priority peripheral */
goto peripheral;
irq += MPC52xx_CRIT_IRQ_BASE;
}
else if (status & 0x00200000) { /* main */
irq = (status >> 16) & 0x1f;
if (irq == 4) /* low priority peripheral */
goto peripheral;
irq += MPC52xx_MAIN_IRQ_BASE;
}
else if (status & 0x20000000) { /* peripheral */
peripheral:
irq = (status >> 24) & 0x1f;
if (irq == 0) { /* bestcomm */
status = in_be32(&sdma->IntPend);
irq = ffs(status) + MPC52xx_SDMA_IRQ_BASE-1;
}
else
irq += MPC52xx_PERP_IRQ_BASE;
}
return irq;
}
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