diff options
Diffstat (limited to 'kernel/arch/arm/mach-imx/avic.c')
| -rw-r--r-- | kernel/arch/arm/mach-imx/avic.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-imx/avic.c b/kernel/arch/arm/mach-imx/avic.c new file mode 100644 index 000000000..1a8932335 --- /dev/null +++ b/kernel/arch/arm/mach-imx/avic.c @@ -0,0 +1,201 @@ +/* + * 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 <asm/mach/irq.h> +#include <asm/exception.h> + +#include "common.h" +#include "hardware.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 + +static void __iomem *avic_base; +static struct irq_domain *domain; + +#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_FIQ + .set_irq_fiq = avic_set_irq_fiq, +#endif +}; + +#ifdef CONFIG_PM +static u32 avic_saved_mask_reg[2]; + +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); +} + +static 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_domain_irq(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)); + + set_handle_irq(avic_handle_irq); + +#ifdef CONFIG_FIQ + /* Initialize FIQ */ + init_FIQ(FIQ_START); +#endif + + printk(KERN_INFO "MXC IRQ initialized\n"); +} |