200 lines
4.8 KiB
C
Executable file
200 lines
4.8 KiB
C
Executable file
/*
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* intc-simr.c
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*
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* Interrupt controller code for the ColdFire 5208, 5207 & 532x parts.
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*
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* (C) Copyright 2009-2011, Greg Ungerer <gerg@snapgear.com>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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#include <asm/coldfire.h>
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#include <asm/mcfsim.h>
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#include <asm/traps.h>
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/*
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* The EDGE Port interrupts are the fixed 7 external interrupts.
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* They need some special treatment, for example they need to be acked.
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*/
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#ifdef CONFIG_M520x
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/*
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* The 520x parts only support a limited range of these external
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* interrupts, only 1, 4 and 7 (as interrupts 65, 66 and 67).
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*/
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#define EINT0 64 /* Is not actually used, but spot reserved for it */
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#define EINT1 65 /* EDGE Port interrupt 1 */
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#define EINT4 66 /* EDGE Port interrupt 4 */
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#define EINT7 67 /* EDGE Port interrupt 7 */
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static unsigned int irqebitmap[] = { 0, 1, 4, 7 };
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static inline unsigned int irq2ebit(unsigned int irq)
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{
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return irqebitmap[irq - EINT0];
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}
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#else
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/*
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* Most of the ColdFire parts with the EDGE Port module just have
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* a strait direct mapping of the 7 external interrupts. Although
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* there is a bit reserved for 0, it is not used.
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*/
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#define EINT0 64 /* Is not actually used, but spot reserved for it */
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#define EINT1 65 /* EDGE Port interrupt 1 */
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#define EINT7 71 /* EDGE Port interrupt 7 */
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static inline unsigned int irq2ebit(unsigned int irq)
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{
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return irq - EINT0;
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}
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#endif
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/*
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* There maybe one, two or three interrupt control units, each has 64
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* interrupts. If there is no second or third unit then MCFINTC1_* or
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* MCFINTC2_* defines will be 0 (and code for them optimized away).
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*/
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static void intc_irq_mask(struct irq_data *d)
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{
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unsigned int irq = d->irq - MCFINT_VECBASE;
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if (MCFINTC2_SIMR && (irq > 128))
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__raw_writeb(irq - 128, MCFINTC2_SIMR);
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else if (MCFINTC1_SIMR && (irq > 64))
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__raw_writeb(irq - 64, MCFINTC1_SIMR);
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else
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__raw_writeb(irq, MCFINTC0_SIMR);
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}
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static void intc_irq_unmask(struct irq_data *d)
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{
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unsigned int irq = d->irq - MCFINT_VECBASE;
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if (MCFINTC2_CIMR && (irq > 128))
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__raw_writeb(irq - 128, MCFINTC2_CIMR);
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else if (MCFINTC1_CIMR && (irq > 64))
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__raw_writeb(irq - 64, MCFINTC1_CIMR);
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else
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__raw_writeb(irq, MCFINTC0_CIMR);
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}
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static void intc_irq_ack(struct irq_data *d)
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{
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unsigned int ebit = irq2ebit(d->irq);
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__raw_writeb(0x1 << ebit, MCFEPORT_EPFR);
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}
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static unsigned int intc_irq_startup(struct irq_data *d)
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{
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unsigned int irq = d->irq;
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if ((irq >= EINT1) && (irq <= EINT7)) {
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unsigned int ebit = irq2ebit(irq);
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u8 v;
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#if defined(MCFEPORT_EPDDR)
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/* Set EPORT line as input */
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v = __raw_readb(MCFEPORT_EPDDR);
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__raw_writeb(v & ~(0x1 << ebit), MCFEPORT_EPDDR);
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#endif
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/* Set EPORT line as interrupt source */
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v = __raw_readb(MCFEPORT_EPIER);
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__raw_writeb(v | (0x1 << ebit), MCFEPORT_EPIER);
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}
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irq -= MCFINT_VECBASE;
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if (MCFINTC2_ICR0 && (irq > 128))
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__raw_writeb(5, MCFINTC2_ICR0 + irq - 128);
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else if (MCFINTC1_ICR0 && (irq > 64))
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__raw_writeb(5, MCFINTC1_ICR0 + irq - 64);
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else
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__raw_writeb(5, MCFINTC0_ICR0 + irq);
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intc_irq_unmask(d);
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return 0;
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}
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static int intc_irq_set_type(struct irq_data *d, unsigned int type)
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{
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unsigned int ebit, irq = d->irq;
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u16 pa, tb;
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switch (type) {
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case IRQ_TYPE_EDGE_RISING:
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tb = 0x1;
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break;
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case IRQ_TYPE_EDGE_FALLING:
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tb = 0x2;
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break;
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case IRQ_TYPE_EDGE_BOTH:
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tb = 0x3;
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break;
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default:
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/* Level triggered */
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tb = 0;
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break;
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}
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if (tb)
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irq_set_handler(irq, handle_edge_irq);
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ebit = irq2ebit(irq) * 2;
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pa = __raw_readw(MCFEPORT_EPPAR);
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pa = (pa & ~(0x3 << ebit)) | (tb << ebit);
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__raw_writew(pa, MCFEPORT_EPPAR);
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return 0;
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}
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static struct irq_chip intc_irq_chip = {
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.name = "CF-INTC",
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.irq_startup = intc_irq_startup,
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.irq_mask = intc_irq_mask,
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.irq_unmask = intc_irq_unmask,
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};
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static struct irq_chip intc_irq_chip_edge_port = {
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.name = "CF-INTC-EP",
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.irq_startup = intc_irq_startup,
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.irq_mask = intc_irq_mask,
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.irq_unmask = intc_irq_unmask,
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.irq_ack = intc_irq_ack,
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.irq_set_type = intc_irq_set_type,
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};
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void __init init_IRQ(void)
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{
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int irq, eirq;
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/* Mask all interrupt sources */
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__raw_writeb(0xff, MCFINTC0_SIMR);
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if (MCFINTC1_SIMR)
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__raw_writeb(0xff, MCFINTC1_SIMR);
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if (MCFINTC2_SIMR)
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__raw_writeb(0xff, MCFINTC2_SIMR);
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eirq = MCFINT_VECBASE + 64 + (MCFINTC1_ICR0 ? 64 : 0) +
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(MCFINTC2_ICR0 ? 64 : 0);
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for (irq = MCFINT_VECBASE; (irq < eirq); irq++) {
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if ((irq >= EINT1) && (irq <= EINT7))
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irq_set_chip(irq, &intc_irq_chip_edge_port);
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else
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irq_set_chip(irq, &intc_irq_chip);
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irq_set_irq_type(irq, IRQ_TYPE_LEVEL_HIGH);
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irq_set_handler(irq, handle_level_irq);
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}
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}
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