+++ /dev/null
-/*
- * 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/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].chip's with mpc52xx_ic. */
- for (i = 0; i < NR_IRQS; i++) {
- irq_desc[i].chip = &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(void)
-{
- 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;
-}
-
git.samba.org / sfrench / cifs-2.6.git / blobdiff