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Diffstat (limited to 'arch/arm/plat-mxc/avic.c')
| -rw-r--r-- | arch/arm/plat-mxc/avic.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/arch/arm/plat-mxc/avic.c b/arch/arm/plat-mxc/avic.c new file mode 100644 index 00000000000..deb284bc7c4 --- /dev/null +++ b/arch/arm/plat-mxc/avic.c @@ -0,0 +1,158 @@ +/* + * 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/io.h> +#include <mach/common.h> +#include <asm/mach/irq.h> +#include <mach/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 */ + +void __iomem *avic_base; + +#ifdef CONFIG_MXC_IRQ_PRIOR +static int avic_irq_set_priority(unsigned char irq, unsigned char prio) +{ + unsigned int temp; + unsigned int mask = 0x0F << irq % 8 * 4; + + if (irq >= MXC_INTERNAL_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) +{ + unsigned int irqt; + + if (irq >= MXC_INTERNAL_IRQS) + return -EINVAL; + + if (irq < MXC_INTERNAL_IRQS / 2) { + irqt = __raw_readl(avic_base + AVIC_INTTYPEL) & ~(1 << irq); + __raw_writel(irqt | (!!type << irq), avic_base + AVIC_INTTYPEL); + } else { + irq -= MXC_INTERNAL_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 */ + +/* Disable interrupt number "irq" in the AVIC */ +static void mxc_mask_irq(struct irq_data *d) +{ + __raw_writel(d->irq, avic_base + AVIC_INTDISNUM); +} + +/* Enable interrupt number "irq" in the AVIC */ +static void mxc_unmask_irq(struct irq_data *d) +{ + __raw_writel(d->irq, avic_base + AVIC_INTENNUM); +} + +static struct mxc_irq_chip mxc_avic_chip = { + .base = { + .irq_ack = mxc_mask_irq, + .irq_mask = mxc_mask_irq, + .irq_unmask = mxc_unmask_irq, + }, +#ifdef CONFIG_MXC_IRQ_PRIOR + .set_priority = avic_irq_set_priority, +#endif +#ifdef CONFIG_FIQ + .set_irq_fiq = avic_set_irq_fiq, +#endif +}; + +/* + * 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) +{ + 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); + for (i = 0; i < MXC_INTERNAL_IRQS; i++) { + set_irq_chip(i, &mxc_avic_chip.base); + set_irq_handler(i, handle_level_irq); + set_irq_flags(i, IRQF_VALID); + } + + /* 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(); +#endif + + printk(KERN_INFO "MXC IRQ initialized\n"); +} + |