diff options
Diffstat (limited to 'arch/m68knommu')
| -rw-r--r-- | arch/m68knommu/platform/coldfire/intc-2.c | 85 |
1 files changed, 81 insertions, 4 deletions
diff --git a/arch/m68knommu/platform/coldfire/intc-2.c b/arch/m68knommu/platform/coldfire/intc-2.c index 66d4e47dd8d0..2cbfbf035db9 100644 --- a/arch/m68knommu/platform/coldfire/intc-2.c +++ b/arch/m68knommu/platform/coldfire/intc-2.c @@ -7,7 +7,10 @@ * 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. * - * (C) Copyright 2009, Greg Ungerer <gerg@snapgear.com> + * 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 @@ -30,6 +33,14 @@ #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 @@ -76,9 +87,17 @@ static void intc_irq_unmask(struct irq_data *d) __raw_writel(val & ~imrbit, imraddr); } -static int intc_irq_set_type(struct irq_data *d, unsigned int type) +/* + * 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) { - return 0; + unsigned int irq = d->irq; + + __raw_writeb(0x1 << (irq - EINT0), MCFEPORT_EPFR); } /* @@ -104,15 +123,70 @@ static unsigned int intc_irq_startup(struct irq_data *d) 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, }; @@ -129,7 +203,10 @@ void __init init_IRQ(void) #endif for (irq = MCFINT_VECBASE; (irq < MCFINT_VECBASE + NR_VECS); irq++) { - set_irq_chip(irq, &intc_irq_chip); + 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); } |