diff options
Diffstat (limited to 'arch/frv/kernel/irq-mb93493.c')
| -rw-r--r-- | arch/frv/kernel/irq-mb93493.c | 160 |
1 files changed, 101 insertions, 59 deletions
diff --git a/arch/frv/kernel/irq-mb93493.c b/arch/frv/kernel/irq-mb93493.c index 988d035640e..39c0188a349 100644 --- a/arch/frv/kernel/irq-mb93493.c +++ b/arch/frv/kernel/irq-mb93493.c @@ -1,6 +1,6 @@ /* irq-mb93493.c: MB93493 companion chip interrupt handler * - * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. + * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or @@ -24,84 +24,126 @@ #include <asm/delay.h> #include <asm/irq.h> #include <asm/irc-regs.h> -#include <asm/irq-routing.h> #include <asm/mb93493-irqs.h> +#include <asm/mb93493-regs.h> -static void frv_mb93493_doirq(struct irq_source *source); +#define IRQ_ROUTE_ONE(X) (X##_ROUTE << (X - IRQ_BASE_MB93493)) + +#define IRQ_ROUTING \ + (IRQ_ROUTE_ONE(IRQ_MB93493_VDC) | \ + IRQ_ROUTE_ONE(IRQ_MB93493_VCC) | \ + IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_OUT) | \ + IRQ_ROUTE_ONE(IRQ_MB93493_I2C_0) | \ + IRQ_ROUTE_ONE(IRQ_MB93493_I2C_1) | \ + IRQ_ROUTE_ONE(IRQ_MB93493_USB) | \ + IRQ_ROUTE_ONE(IRQ_MB93493_LOCAL_BUS) | \ + IRQ_ROUTE_ONE(IRQ_MB93493_PCMCIA) | \ + IRQ_ROUTE_ONE(IRQ_MB93493_GPIO) | \ + IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_IN)) -/*****************************************************************************/ /* - * MB93493 companion chip IRQ multiplexor + * daughter board PIC operations + * - there is no way to ACK interrupts in the MB93493 chip */ -static struct irq_source frv_mb93493[2] = { - [0] = { - .muxname = "mb93493.0", - .muxdata = __region_CS3 + 0x3d0, - .doirq = frv_mb93493_doirq, - .irqmask = 0x0000, - }, - [1] = { - .muxname = "mb93493.1", - .muxdata = __region_CS3 + 0x3d4, - .doirq = frv_mb93493_doirq, - .irqmask = 0x0000, - }, -}; - -static void frv_mb93493_control(struct irq_group *group, int index, int on) +static void frv_mb93493_mask(unsigned int irq) { - struct irq_source *source; uint32_t iqsr; + volatile void *piqsr; - if ((frv_mb93493[0].irqmask & (1 << index))) - source = &frv_mb93493[0]; + if (IRQ_ROUTING & (1 << (irq - IRQ_BASE_MB93493))) + piqsr = __addr_MB93493_IQSR(1); else - source = &frv_mb93493[1]; + piqsr = __addr_MB93493_IQSR(0); + + iqsr = readl(piqsr); + iqsr &= ~(1 << (irq - IRQ_BASE_MB93493 + 16)); + writel(iqsr, piqsr); +} - iqsr = readl(source->muxdata); - if (on) - iqsr |= 1 << (index + 16); +static void frv_mb93493_ack(unsigned int irq) +{ +} + +static void frv_mb93493_unmask(unsigned int irq) +{ + uint32_t iqsr; + volatile void *piqsr; + + if (IRQ_ROUTING & (1 << (irq - IRQ_BASE_MB93493))) + piqsr = __addr_MB93493_IQSR(1); else - iqsr &= ~(1 << (index + 16)); + piqsr = __addr_MB93493_IQSR(0); - writel(iqsr, source->muxdata); + iqsr = readl(piqsr); + iqsr |= 1 << (irq - IRQ_BASE_MB93493 + 16); + writel(iqsr, piqsr); } -static struct irq_group frv_mb93493_irqs = { - .first_irq = IRQ_BASE_MB93493, - .control = frv_mb93493_control, +static struct irq_chip frv_mb93493_pic = { + .name = "mb93093", + .ack = frv_mb93493_ack, + .mask = frv_mb93493_mask, + .mask_ack = frv_mb93493_mask, + .unmask = frv_mb93493_unmask, }; -static void frv_mb93493_doirq(struct irq_source *source) +/* + * MB93493 PIC interrupt handler + */ +static irqreturn_t mb93493_interrupt(int irq, void *_piqsr, struct pt_regs *regs) { - uint32_t mask = readl(source->muxdata); - mask = mask & (mask >> 16) & 0xffff; + volatile void *piqsr = _piqsr; + uint32_t iqsr; - if (mask) - distribute_irqs(&frv_mb93493_irqs, mask); -} + iqsr = readl(piqsr); + iqsr = iqsr & (iqsr >> 16) & 0xffff; -static void __init mb93493_irq_route(int irq, int source) -{ - frv_mb93493[source].irqmask |= 1 << (irq - IRQ_BASE_MB93493); - frv_mb93493_irqs.sources[irq - IRQ_BASE_MB93493] = &frv_mb93493[source]; + /* poll all the triggered IRQs */ + while (iqsr) { + int irq; + + asm("scan %1,gr0,%0" : "=r"(irq) : "r"(iqsr)); + irq = 31 - irq; + iqsr &= ~(1 << irq); + + generic_handle_irq(IRQ_BASE_MB93493 + irq, regs); + } + + return IRQ_HANDLED; } -void __init route_mb93493_irqs(void) +/* + * define an interrupt action for each MB93493 PIC output + * - use dev_id to indicate the MB93493 PIC input to output mappings + */ +static struct irqaction mb93493_irq[2] = { + [0] = { + .handler = mb93493_interrupt, + .flags = IRQF_DISABLED | IRQF_SHARED, + .mask = CPU_MASK_NONE, + .name = "mb93493.0", + .dev_id = (void *) __addr_MB93493_IQSR(0), + }, + [1] = { + .handler = mb93493_interrupt, + .flags = IRQF_DISABLED | IRQF_SHARED, + .mask = CPU_MASK_NONE, + .name = "mb93493.1", + .dev_id = (void *) __addr_MB93493_IQSR(1), + } +}; + +/* + * initialise the motherboard MB93493's PIC + */ +void __init mb93493_init(void) { - frv_irq_route_external(&frv_mb93493[0], IRQ_CPU_MB93493_0); - frv_irq_route_external(&frv_mb93493[1], IRQ_CPU_MB93493_1); - - frv_irq_set_group(&frv_mb93493_irqs); - - mb93493_irq_route(IRQ_MB93493_VDC, IRQ_MB93493_VDC_ROUTE); - mb93493_irq_route(IRQ_MB93493_VCC, IRQ_MB93493_VCC_ROUTE); - mb93493_irq_route(IRQ_MB93493_AUDIO_IN, IRQ_MB93493_AUDIO_IN_ROUTE); - mb93493_irq_route(IRQ_MB93493_I2C_0, IRQ_MB93493_I2C_0_ROUTE); - mb93493_irq_route(IRQ_MB93493_I2C_1, IRQ_MB93493_I2C_1_ROUTE); - mb93493_irq_route(IRQ_MB93493_USB, IRQ_MB93493_USB_ROUTE); - mb93493_irq_route(IRQ_MB93493_LOCAL_BUS, IRQ_MB93493_LOCAL_BUS_ROUTE); - mb93493_irq_route(IRQ_MB93493_PCMCIA, IRQ_MB93493_PCMCIA_ROUTE); - mb93493_irq_route(IRQ_MB93493_GPIO, IRQ_MB93493_GPIO_ROUTE); - mb93493_irq_route(IRQ_MB93493_AUDIO_OUT, IRQ_MB93493_AUDIO_OUT_ROUTE); + int irq; + + for (irq = IRQ_BASE_MB93493 + 0; irq <= IRQ_BASE_MB93493 + 10; irq++) + set_irq_chip_and_handler(irq, &frv_mb93493_pic, handle_edge_irq); + + /* the MB93493 drives external IRQ inputs on the CPU PIC */ + setup_irq(IRQ_CPU_MB93493_0, &mb93493_irq[0]); + setup_irq(IRQ_CPU_MB93493_1, &mb93493_irq[1]); } |