+++ /dev/null
-/*
- * intc-2.c
- *
- * General interrupt controller code for the many ColdFire cores that use
- * interrupt controllers with 63 interrupt sources, organized as 56 fully-
- * programmable + 7 fixed-level interrupt sources. This includes the 523x
- * family, the 5270, 5271, 5274, 5275, and the 528x family which have two such
- * controllers, and the 547x and 548x families which have only one of them.
- *
- * The external 7 fixed interrupts are part the the Edge Port unit of these
- * ColdFire parts. They can be configured as level or edge triggered.
- *
- * (C) Copyright 2009-2011, Greg Ungerer <gerg@snapgear.com>
- *
- * 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/types.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/io.h>
-#include <asm/coldfire.h>
-#include <asm/mcfsim.h>
-#include <asm/traps.h>
-
-/*
- * Bit definitions for the ICR family of registers.
- */
-#define MCFSIM_ICR_LEVEL(l) ((l)<<3) /* Level l intr */
-#define MCFSIM_ICR_PRI(p) (p) /* Priority p intr */
-
-/*
- * The EDGE Port interrupts are the fixed 7 external interrupts.
- * They need some special treatment, for example they need to be acked.
- */
-#define EINT0 64 /* Is not actually used, but spot reserved for it */
-#define EINT1 65 /* EDGE Port interrupt 1 */
-#define EINT7 71 /* EDGE Port interrupt 7 */
-
-#ifdef MCFICM_INTC1
-#define NR_VECS 128
-#else
-#define NR_VECS 64
-#endif
-
-static void intc_irq_mask(struct irq_data *d)
-{
- unsigned int irq = d->irq - MCFINT_VECBASE;
- unsigned long imraddr;
- u32 val, imrbit;
-
-#ifdef MCFICM_INTC1
- imraddr = (irq & 0x40) ? MCFICM_INTC1 : MCFICM_INTC0;
-#else
- imraddr = MCFICM_INTC0;
-#endif
- imraddr += (irq & 0x20) ? MCFINTC_IMRH : MCFINTC_IMRL;
- imrbit = 0x1 << (irq & 0x1f);
-
- val = __raw_readl(imraddr);
- __raw_writel(val | imrbit, imraddr);
-}
-
-static void intc_irq_unmask(struct irq_data *d)
-{
- unsigned int irq = d->irq - MCFINT_VECBASE;
- unsigned long imraddr;
- u32 val, imrbit;
-
-#ifdef MCFICM_INTC1
- imraddr = (irq & 0x40) ? MCFICM_INTC1 : MCFICM_INTC0;
-#else
- imraddr = MCFICM_INTC0;
-#endif
- imraddr += ((irq & 0x20) ? MCFINTC_IMRH : MCFINTC_IMRL);
- imrbit = 0x1 << (irq & 0x1f);
-
- /* Don't set the "maskall" bit! */
- if ((irq & 0x20) == 0)
- imrbit |= 0x1;
-
- val = __raw_readl(imraddr);
- __raw_writel(val & ~imrbit, imraddr);
-}
-
-/*
- * Only the external (or EDGE Port) interrupts need to be acknowledged
- * here, as part of the IRQ handler. They only really need to be ack'ed
- * if they are in edge triggered mode, but there is no harm in doing it
- * for all types.
- */
-static void intc_irq_ack(struct irq_data *d)
-{
- unsigned int irq = d->irq;
-
- __raw_writeb(0x1 << (irq - EINT0), MCFEPORT_EPFR);
-}
-
-/*
- * Each vector needs a unique priority and level associated with it.
- * We don't really care so much what they are, we don't rely on the
- * traditional priority interrupt scheme of the m68k/ColdFire. This
- * only needs to be set once for an interrupt, and we will never change
- * these values once we have set them.
- */
-static u8 intc_intpri = MCFSIM_ICR_LEVEL(6) | MCFSIM_ICR_PRI(6);
-
-static unsigned int intc_irq_startup(struct irq_data *d)
-{
- unsigned int irq = d->irq - MCFINT_VECBASE;
- unsigned long icraddr;
-
-#ifdef MCFICM_INTC1
- icraddr = (irq & 0x40) ? MCFICM_INTC1 : MCFICM_INTC0;
-#else
- icraddr = MCFICM_INTC0;
-#endif
- icraddr += MCFINTC_ICR0 + (irq & 0x3f);
- if (__raw_readb(icraddr) == 0)
- __raw_writeb(intc_intpri--, icraddr);
-
- irq = d->irq;
- if ((irq >= EINT1) && (irq <= EINT7)) {
- u8 v;
-
- irq -= EINT0;
-
- /* Set EPORT line as input */
- v = __raw_readb(MCFEPORT_EPDDR);
- __raw_writeb(v & ~(0x1 << irq), MCFEPORT_EPDDR);
-
- /* Set EPORT line as interrupt source */
- v = __raw_readb(MCFEPORT_EPIER);
- __raw_writeb(v | (0x1 << irq), MCFEPORT_EPIER);
- }
-
- intc_irq_unmask(d);
- return 0;
-}
-
-static int intc_irq_set_type(struct irq_data *d, unsigned int type)
-{
- unsigned int irq = d->irq;
- u16 pa, tb;
-
- switch (type) {
- case IRQ_TYPE_EDGE_RISING:
- tb = 0x1;
- break;
- case IRQ_TYPE_EDGE_FALLING:
- tb = 0x2;
- break;
- case IRQ_TYPE_EDGE_BOTH:
- tb = 0x3;
- break;
- default:
- /* Level triggered */
- tb = 0;
- break;
- }
-
- if (tb)
- set_irq_handler(irq, handle_edge_irq);
-
- irq -= EINT0;
- pa = __raw_readw(MCFEPORT_EPPAR);
- pa = (pa & ~(0x3 << (irq * 2))) | (tb << (irq * 2));
- __raw_writew(pa, MCFEPORT_EPPAR);
-
- return 0;
-}
-
-static struct irq_chip intc_irq_chip = {
- .name = "CF-INTC",
- .irq_startup = intc_irq_startup,
- .irq_mask = intc_irq_mask,
- .irq_unmask = intc_irq_unmask,
-};
-
-static struct irq_chip intc_irq_chip_edge_port = {
- .name = "CF-INTC-EP",
- .irq_startup = intc_irq_startup,
- .irq_mask = intc_irq_mask,
- .irq_unmask = intc_irq_unmask,
- .irq_ack = intc_irq_ack,
- .irq_set_type = intc_irq_set_type,
-};
-
-void __init init_IRQ(void)
-{
- int irq;
-
- init_vectors();
-
- /* Mask all interrupt sources */
- __raw_writel(0x1, MCFICM_INTC0 + MCFINTC_IMRL);
-#ifdef MCFICM_INTC1
- __raw_writel(0x1, MCFICM_INTC1 + MCFINTC_IMRL);
-#endif
-
- for (irq = MCFINT_VECBASE; (irq < MCFINT_VECBASE + NR_VECS); irq++) {
- if ((irq >= EINT1) && (irq <=EINT7))
- set_irq_chip(irq, &intc_irq_chip_edge_port);
- else
- set_irq_chip(irq, &intc_irq_chip);
- set_irq_type(irq, IRQ_TYPE_LEVEL_HIGH);
- set_irq_handler(irq, handle_level_irq);
- }
-}
-
git.openpandora.org / pandora-kernel.git / blobdiff