--- /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)
+ irq_set_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;
+
+ /* 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))
+ irq_set_chip(irq, &intc_irq_chip_edge_port);
+ else
+ irq_set_chip(irq, &intc_irq_chip);
+ irq_set_irq_type(irq, IRQ_TYPE_LEVEL_HIGH);
+ irq_set_handler(irq, handle_level_irq);
+ }
+}
+
projects / firefly-linux-kernel-4.4.55.git / blobdiff