/* * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. * Copyright 2008 Juergen Beisert, kernel@pengutronix.de * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, * MA 02110-1301, USA. */ #include <linux/module.h> #include <linux/irq.h> #include <linux/irqdomain.h> #include <linux/io.h> #include <linux/of.h> #include <mach/common.h> #include <asm/mach/irq.h> #include <asm/exception.h> #include <mach/hardware.h> #include <mach/irqs.h> #include "irq-common.h" #define AVIC_INTCNTL 0x00 /* int control reg */ #define AVIC_NIMASK 0x04 /* int mask reg */ #define AVIC_INTENNUM 0x08 /* int enable number reg */ #define AVIC_INTDISNUM 0x0C /* int disable number reg */ #define AVIC_INTENABLEH 0x10 /* int enable reg high */ #define AVIC_INTENABLEL 0x14 /* int enable reg low */ #define AVIC_INTTYPEH 0x18 /* int type reg high */ #define AVIC_INTTYPEL 0x1C /* int type reg low */ #define AVIC_NIPRIORITY(x) (0x20 + 4 * (7 - (x))) /* int priority */ #define AVIC_NIVECSR 0x40 /* norm int vector/status */ #define AVIC_FIVECSR 0x44 /* fast int vector/status */ #define AVIC_INTSRCH 0x48 /* int source reg high */ #define AVIC_INTSRCL 0x4C /* int source reg low */ #define AVIC_INTFRCH 0x50 /* int force reg high */ #define AVIC_INTFRCL 0x54 /* int force reg low */ #define AVIC_NIPNDH 0x58 /* norm int pending high */ #define AVIC_NIPNDL 0x5C /* norm int pending low */ #define AVIC_FIPNDH 0x60 /* fast int pending high */ #define AVIC_FIPNDL 0x64 /* fast int pending low */ #define AVIC_NUM_IRQS 64 void __iomem *avic_base; static struct irq_domain *domain; static u32 avic_saved_mask_reg[2]; #ifdef CONFIG_MXC_IRQ_PRIOR static int avic_irq_set_priority(unsigned char irq, unsigned char prio) { struct irq_data *d = irq_get_irq_data(irq); unsigned int temp; unsigned int mask = 0x0F << irq % 8 * 4; irq = d->hwirq; if (irq >= AVIC_NUM_IRQS) return -EINVAL; temp = __raw_readl(avic_base + AVIC_NIPRIORITY(irq / 8)); temp &= ~mask; temp |= prio & mask; __raw_writel(temp, avic_base + AVIC_NIPRIORITY(irq / 8)); return 0; } #endif #ifdef CONFIG_FIQ static int avic_set_irq_fiq(unsigned int irq, unsigned int type) { struct irq_data *d = irq_get_irq_data(irq); unsigned int irqt; irq = d->hwirq; if (irq >= AVIC_NUM_IRQS) return -EINVAL; if (irq < AVIC_NUM_IRQS / 2) { irqt = __raw_readl(avic_base + AVIC_INTTYPEL) & ~(1 << irq); __raw_writel(irqt | (!!type << irq), avic_base + AVIC_INTTYPEL); } else { irq -= AVIC_NUM_IRQS / 2; irqt = __raw_readl(avic_base + AVIC_INTTYPEH) & ~(1 << irq); __raw_writel(irqt | (!!type << irq), avic_base + AVIC_INTTYPEH); } return 0; } #endif /* CONFIG_FIQ */ static struct mxc_extra_irq avic_extra_irq = { #ifdef CONFIG_MXC_IRQ_PRIOR .set_priority = avic_irq_set_priority, #endif #ifdef CONFIG_FIQ .set_irq_fiq = avic_set_irq_fiq, #endif }; #ifdef CONFIG_PM static void avic_irq_suspend(struct irq_data *d) { struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); struct irq_chip_type *ct = gc->chip_types; int idx = d->hwirq >> 5; avic_saved_mask_reg[idx] = __raw_readl(avic_base + ct->regs.mask); __raw_writel(gc->wake_active, avic_base + ct->regs.mask); } static void avic_irq_resume(struct irq_data *d) { struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); struct irq_chip_type *ct = gc->chip_types; int idx = d->hwirq >> 5; __raw_writel(avic_saved_mask_reg[idx], avic_base + ct->regs.mask); } #else #define avic_irq_suspend NULL #define avic_irq_resume NULL #endif static __init void avic_init_gc(int idx, unsigned int irq_start) { struct irq_chip_generic *gc; struct irq_chip_type *ct; gc = irq_alloc_generic_chip("mxc-avic", 1, irq_start, avic_base, handle_level_irq); gc->private = &avic_extra_irq; gc->wake_enabled = IRQ_MSK(32); ct = gc->chip_types; ct->chip.irq_mask = irq_gc_mask_clr_bit; ct->chip.irq_unmask = irq_gc_mask_set_bit; ct->chip.irq_ack = irq_gc_mask_clr_bit; ct->chip.irq_set_wake = irq_gc_set_wake; ct->chip.irq_suspend = avic_irq_suspend; ct->chip.irq_resume = avic_irq_resume; ct->regs.mask = !idx ? AVIC_INTENABLEL : AVIC_INTENABLEH; ct->regs.ack = ct->regs.mask; irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0); } asmlinkage void __exception_irq_entry avic_handle_irq(struct pt_regs *regs) { u32 nivector; do { nivector = __raw_readl(avic_base + AVIC_NIVECSR) >> 16; if (nivector == 0xffff) break; handle_IRQ(irq_find_mapping(domain, nivector), regs); } while (1); } /* * This function initializes the AVIC hardware and disables all the * interrupts. It registers the interrupt enable and disable functions * to the kernel for each interrupt source. */ void __init mxc_init_irq(void __iomem *irqbase) { struct device_node *np; int irq_base; int i; avic_base = irqbase; /* put the AVIC into the reset value with * all interrupts disabled */ __raw_writel(0, avic_base + AVIC_INTCNTL); __raw_writel(0x1f, avic_base + AVIC_NIMASK); /* disable all interrupts */ __raw_writel(0, avic_base + AVIC_INTENABLEH); __raw_writel(0, avic_base + AVIC_INTENABLEL); /* all IRQ no FIQ */ __raw_writel(0, avic_base + AVIC_INTTYPEH); __raw_writel(0, avic_base + AVIC_INTTYPEL); irq_base = irq_alloc_descs(-1, 0, AVIC_NUM_IRQS, numa_node_id()); WARN_ON(irq_base < 0); np = of_find_compatible_node(NULL, NULL, "fsl,avic"); domain = irq_domain_add_legacy(np, AVIC_NUM_IRQS, irq_base, 0, &irq_domain_simple_ops, NULL); WARN_ON(!domain); for (i = 0; i < AVIC_NUM_IRQS / 32; i++, irq_base += 32) avic_init_gc(i, irq_base); /* Set default priority value (0) for all IRQ's */ for (i = 0; i < 8; i++) __raw_writel(0, avic_base + AVIC_NIPRIORITY(i)); #ifdef CONFIG_FIQ /* Initialize FIQ */ init_FIQ(FIQ_START); #endif printk(KERN_INFO "MXC IRQ initialized\n"); }