diff options
Diffstat (limited to 'arch/mips/lantiq/irq.c')
| -rw-r--r-- | arch/mips/lantiq/irq.c | 105 |
1 files changed, 73 insertions, 32 deletions
diff --git a/arch/mips/lantiq/irq.c b/arch/mips/lantiq/irq.c index 5323308aab3f..51194875f158 100644 --- a/arch/mips/lantiq/irq.c +++ b/arch/mips/lantiq/irq.c @@ -33,17 +33,10 @@ /* register definitions - external irqs */ #define LTQ_EIU_EXIN_C 0x0000 #define LTQ_EIU_EXIN_INIC 0x0004 +#define LTQ_EIU_EXIN_INC 0x0008 #define LTQ_EIU_EXIN_INEN 0x000C -/* irq numbers used by the external interrupt unit (EIU) */ -#define LTQ_EIU_IR0 (INT_NUM_IM4_IRL0 + 30) -#define LTQ_EIU_IR1 (INT_NUM_IM3_IRL0 + 31) -#define LTQ_EIU_IR2 (INT_NUM_IM1_IRL0 + 26) -#define LTQ_EIU_IR3 INT_NUM_IM1_IRL0 -#define LTQ_EIU_IR4 (INT_NUM_IM1_IRL0 + 1) -#define LTQ_EIU_IR5 (INT_NUM_IM1_IRL0 + 2) -#define LTQ_EIU_IR6 (INT_NUM_IM2_IRL0 + 30) -#define XWAY_EXIN_COUNT 3 +/* number of external interrupts */ #define MAX_EIU 6 /* the performance counter */ @@ -72,20 +65,19 @@ int gic_present; #endif -static unsigned short ltq_eiu_irq[MAX_EIU] = { - LTQ_EIU_IR0, - LTQ_EIU_IR1, - LTQ_EIU_IR2, - LTQ_EIU_IR3, - LTQ_EIU_IR4, - LTQ_EIU_IR5, -}; - static int exin_avail; +static struct resource ltq_eiu_irq[MAX_EIU]; static void __iomem *ltq_icu_membase[MAX_IM]; static void __iomem *ltq_eiu_membase; static struct irq_domain *ltq_domain; +int ltq_eiu_get_irq(int exin) +{ + if (exin < exin_avail) + return ltq_eiu_irq[exin].start; + return -1; +} + void ltq_disable_irq(struct irq_data *d) { u32 ier = LTQ_ICU_IM0_IER; @@ -128,19 +120,65 @@ void ltq_enable_irq(struct irq_data *d) ltq_icu_w32(im, ltq_icu_r32(im, ier) | BIT(offset), ier); } +static int ltq_eiu_settype(struct irq_data *d, unsigned int type) +{ + int i; + + for (i = 0; i < MAX_EIU; i++) { + if (d->hwirq == ltq_eiu_irq[i].start) { + int val = 0; + int edge = 0; + + switch (type) { + case IRQF_TRIGGER_NONE: + break; + case IRQF_TRIGGER_RISING: + val = 1; + edge = 1; + break; + case IRQF_TRIGGER_FALLING: + val = 2; + edge = 1; + break; + case IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING: + val = 3; + edge = 1; + break; + case IRQF_TRIGGER_HIGH: + val = 5; + break; + case IRQF_TRIGGER_LOW: + val = 6; + break; + default: + pr_err("invalid type %d for irq %ld\n", + type, d->hwirq); + return -EINVAL; + } + + if (edge) + irq_set_handler(d->hwirq, handle_edge_irq); + + ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_C) | + (val << (i * 4)), LTQ_EIU_EXIN_C); + } + } + + return 0; +} + static unsigned int ltq_startup_eiu_irq(struct irq_data *d) { int i; ltq_enable_irq(d); for (i = 0; i < MAX_EIU; i++) { - if (d->hwirq == ltq_eiu_irq[i]) { - /* low level - we should really handle set_type */ - ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_C) | - (0x6 << (i * 4)), LTQ_EIU_EXIN_C); + if (d->hwirq == ltq_eiu_irq[i].start) { + /* by default we are low level triggered */ + ltq_eiu_settype(d, IRQF_TRIGGER_LOW); /* clear all pending */ - ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_INIC) & ~BIT(i), - LTQ_EIU_EXIN_INIC); + ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_INC) & ~BIT(i), + LTQ_EIU_EXIN_INC); /* enable */ ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_INEN) | BIT(i), LTQ_EIU_EXIN_INEN); @@ -157,7 +195,7 @@ static void ltq_shutdown_eiu_irq(struct irq_data *d) ltq_disable_irq(d); for (i = 0; i < MAX_EIU; i++) { - if (d->hwirq == ltq_eiu_irq[i]) { + if (d->hwirq == ltq_eiu_irq[i].start) { /* disable */ ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_INEN) & ~BIT(i), LTQ_EIU_EXIN_INEN); @@ -186,6 +224,7 @@ static struct irq_chip ltq_eiu_type = { .irq_ack = ltq_ack_irq, .irq_mask = ltq_disable_irq, .irq_mask_ack = ltq_mask_and_ack_irq, + .irq_set_type = ltq_eiu_settype, }; static void ltq_hw_irqdispatch(int module) @@ -301,7 +340,7 @@ static int icu_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw) return 0; for (i = 0; i < exin_avail; i++) - if (hw == ltq_eiu_irq[i]) + if (hw == ltq_eiu_irq[i].start) chip = <q_eiu_type; irq_set_chip_and_handler(hw, chip, handle_level_irq); @@ -323,7 +362,7 @@ int __init icu_of_init(struct device_node *node, struct device_node *parent) { struct device_node *eiu_node; struct resource res; - int i; + int i, ret; for (i = 0; i < MAX_IM; i++) { if (of_address_to_resource(node, i, &res)) @@ -340,17 +379,19 @@ int __init icu_of_init(struct device_node *node, struct device_node *parent) } /* the external interrupts are optional and xway only */ - eiu_node = of_find_compatible_node(NULL, NULL, "lantiq,eiu"); + eiu_node = of_find_compatible_node(NULL, NULL, "lantiq,eiu-xway"); if (eiu_node && !of_address_to_resource(eiu_node, 0, &res)) { /* find out how many external irq sources we have */ - const __be32 *count = of_get_property(node, - "lantiq,count", NULL); + exin_avail = of_irq_count(eiu_node); - if (count) - exin_avail = *count; if (exin_avail > MAX_EIU) exin_avail = MAX_EIU; + ret = of_irq_to_resource_table(eiu_node, + ltq_eiu_irq, exin_avail); + if (ret != exin_avail) + panic("failed to load external irq resources\n"); + if (request_mem_region(res.start, resource_size(&res), res.name) < 0) pr_err("Failed to request eiu memory"); |