--- /dev/null
+/*
+ * intc.c -- interrupt controller or ColdFire 5272 SoC
+ *
+ * (C) Copyright 2009, 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/kernel_stat.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <asm/coldfire.h>
+#include <asm/mcfsim.h>
+#include <asm/traps.h>
+
+/*
+ * The 5272 ColdFire interrupt controller is nothing like any other
+ * ColdFire interrupt controller - it truly is completely different.
+ * Given its age it is unlikely to be used on any other ColdFire CPU.
+ */
+
+/*
+ * The masking and priproty setting of interrupts on the 5272 is done
+ * via a set of 4 "Interrupt Controller Registers" (ICR). There is a
+ * loose mapping of vector number to register and internal bits, but
+ * a table is the easiest and quickest way to map them.
+ *
+ * Note that the external interrupts are edge triggered (unlike the
+ * internal interrupt sources which are level triggered). Which means
+ * they also need acknowledging via acknowledge bits.
+ */
+struct irqmap {
+ unsigned int icr;
+ unsigned char index;
+ unsigned char ack;
+};
+
+static struct irqmap intc_irqmap[MCFINT_VECMAX - MCFINT_VECBASE] = {
+ /*MCF_IRQ_SPURIOUS*/ { .icr = 0, .index = 0, .ack = 0, },
+ /*MCF_IRQ_EINT1*/ { .icr = MCFSIM_ICR1, .index = 28, .ack = 1, },
+ /*MCF_IRQ_EINT2*/ { .icr = MCFSIM_ICR1, .index = 24, .ack = 1, },
+ /*MCF_IRQ_EINT3*/ { .icr = MCFSIM_ICR1, .index = 20, .ack = 1, },
+ /*MCF_IRQ_EINT4*/ { .icr = MCFSIM_ICR1, .index = 16, .ack = 1, },
+ /*MCF_IRQ_TIMER1*/ { .icr = MCFSIM_ICR1, .index = 12, .ack = 0, },
+ /*MCF_IRQ_TIMER2*/ { .icr = MCFSIM_ICR1, .index = 8, .ack = 0, },
+ /*MCF_IRQ_TIMER3*/ { .icr = MCFSIM_ICR1, .index = 4, .ack = 0, },
+ /*MCF_IRQ_TIMER4*/ { .icr = MCFSIM_ICR1, .index = 0, .ack = 0, },
+ /*MCF_IRQ_UART1*/ { .icr = MCFSIM_ICR2, .index = 28, .ack = 0, },
+ /*MCF_IRQ_UART2*/ { .icr = MCFSIM_ICR2, .index = 24, .ack = 0, },
+ /*MCF_IRQ_PLIP*/ { .icr = MCFSIM_ICR2, .index = 20, .ack = 0, },
+ /*MCF_IRQ_PLIA*/ { .icr = MCFSIM_ICR2, .index = 16, .ack = 0, },
+ /*MCF_IRQ_USB0*/ { .icr = MCFSIM_ICR2, .index = 12, .ack = 0, },
+ /*MCF_IRQ_USB1*/ { .icr = MCFSIM_ICR2, .index = 8, .ack = 0, },
+ /*MCF_IRQ_USB2*/ { .icr = MCFSIM_ICR2, .index = 4, .ack = 0, },
+ /*MCF_IRQ_USB3*/ { .icr = MCFSIM_ICR2, .index = 0, .ack = 0, },
+ /*MCF_IRQ_USB4*/ { .icr = MCFSIM_ICR3, .index = 28, .ack = 0, },
+ /*MCF_IRQ_USB5*/ { .icr = MCFSIM_ICR3, .index = 24, .ack = 0, },
+ /*MCF_IRQ_USB6*/ { .icr = MCFSIM_ICR3, .index = 20, .ack = 0, },
+ /*MCF_IRQ_USB7*/ { .icr = MCFSIM_ICR3, .index = 16, .ack = 0, },
+ /*MCF_IRQ_DMA*/ { .icr = MCFSIM_ICR3, .index = 12, .ack = 0, },
+ /*MCF_IRQ_ERX*/ { .icr = MCFSIM_ICR3, .index = 8, .ack = 0, },
+ /*MCF_IRQ_ETX*/ { .icr = MCFSIM_ICR3, .index = 4, .ack = 0, },
+ /*MCF_IRQ_ENTC*/ { .icr = MCFSIM_ICR3, .index = 0, .ack = 0, },
+ /*MCF_IRQ_QSPI*/ { .icr = MCFSIM_ICR4, .index = 28, .ack = 0, },
+ /*MCF_IRQ_EINT5*/ { .icr = MCFSIM_ICR4, .index = 24, .ack = 1, },
+ /*MCF_IRQ_EINT6*/ { .icr = MCFSIM_ICR4, .index = 20, .ack = 1, },
+ /*MCF_IRQ_SWTO*/ { .icr = MCFSIM_ICR4, .index = 16, .ack = 0, },
+};
+
+/*
+ * The act of masking the interrupt also has a side effect of 'ack'ing
+ * an interrupt on this irq (for the external irqs). So this mask function
+ * is also an ack_mask function.
+ */
+static void intc_irq_mask(struct irq_data *d)
+{
+ unsigned int irq = d->irq;
+
+ if ((irq >= MCFINT_VECBASE) && (irq <= MCFINT_VECMAX)) {
+ u32 v;
+ irq -= MCFINT_VECBASE;
+ v = 0x8 << intc_irqmap[irq].index;
+ writel(v, intc_irqmap[irq].icr);
+ }
+}
+
+static void intc_irq_unmask(struct irq_data *d)
+{
+ unsigned int irq = d->irq;
+
+ if ((irq >= MCFINT_VECBASE) && (irq <= MCFINT_VECMAX)) {
+ u32 v;
+ irq -= MCFINT_VECBASE;
+ v = 0xd << intc_irqmap[irq].index;
+ writel(v, intc_irqmap[irq].icr);
+ }
+}
+
+static void intc_irq_ack(struct irq_data *d)
+{
+ unsigned int irq = d->irq;
+
+ /* Only external interrupts are acked */
+ if ((irq >= MCFINT_VECBASE) && (irq <= MCFINT_VECMAX)) {
+ irq -= MCFINT_VECBASE;
+ if (intc_irqmap[irq].ack) {
+ u32 v;
+ v = readl(intc_irqmap[irq].icr);
+ v &= (0x7 << intc_irqmap[irq].index);
+ v |= (0x8 << intc_irqmap[irq].index);
+ writel(v, intc_irqmap[irq].icr);
+ }
+ }
+}
+
+static int intc_irq_set_type(struct irq_data *d, unsigned int type)
+{
+ unsigned int irq = d->irq;
+
+ if ((irq >= MCFINT_VECBASE) && (irq <= MCFINT_VECMAX)) {
+ irq -= MCFINT_VECBASE;
+ if (intc_irqmap[irq].ack) {
+ u32 v;
+ v = readl(MCFSIM_PITR);
+ if (type == IRQ_TYPE_EDGE_FALLING)
+ v &= ~(0x1 << (32 - irq));
+ else
+ v |= (0x1 << (32 - irq));
+ writel(v, MCFSIM_PITR);
+ }
+ }
+ return 0;
+}
+
+/*
+ * Simple flow handler to deal with the external edge triggered interrupts.
+ * We need to be careful with the masking/acking due to the side effects
+ * of masking an interrupt.
+ */
+static void intc_external_irq(unsigned int irq, struct irq_desc *desc)
+{
+ irq_desc_get_chip(desc)->irq_ack(&desc->irq_data);
+ handle_simple_irq(irq, desc);
+}
+
+static struct irq_chip intc_irq_chip = {
+ .name = "CF-INTC",
+ .irq_mask = intc_irq_mask,
+ .irq_unmask = intc_irq_unmask,
+ .irq_mask_ack = intc_irq_mask,
+ .irq_ack = intc_irq_ack,
+ .irq_set_type = intc_irq_set_type,
+};
+
+void __init init_IRQ(void)
+{
+ int irq, edge;
+
+ /* Mask all interrupt sources */
+ writel(0x88888888, MCFSIM_ICR1);
+ writel(0x88888888, MCFSIM_ICR2);
+ writel(0x88888888, MCFSIM_ICR3);
+ writel(0x88888888, MCFSIM_ICR4);
+
+ for (irq = 0; (irq < NR_IRQS); irq++) {
+ irq_set_chip(irq, &intc_irq_chip);
+ edge = 0;
+ if ((irq >= MCFINT_VECBASE) && (irq <= MCFINT_VECMAX))
+ edge = intc_irqmap[irq - MCFINT_VECBASE].ack;
+ if (edge) {
+ irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
+ irq_set_handler(irq, intc_external_irq);
+ } else {
+ irq_set_irq_type(irq, IRQ_TYPE_LEVEL_HIGH);
+ irq_set_handler(irq, handle_level_irq);
+ }
+ }
+}
+
Code Review / kvmfornfv.git / blobdiff