diff options
Diffstat (limited to 'arch/arm/mach-s3c24xx/irq-s3c2412.c')
| -rw-r--r-- | arch/arm/mach-s3c24xx/irq-s3c2412.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c24xx/irq-s3c2412.c b/arch/arm/mach-s3c24xx/irq-s3c2412.c new file mode 100644 index 00000000000..e65619ddbcc --- /dev/null +++ b/arch/arm/mach-s3c24xx/irq-s3c2412.c @@ -0,0 +1,214 @@ +/* linux/arch/arm/mach-s3c2412/irq.c + * + * Copyright (c) 2006 Simtec Electronics + * Ben Dooks <ben@simtec.co.uk> + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * +*/ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/ioport.h> +#include <linux/device.h> +#include <linux/io.h> + +#include <mach/hardware.h> +#include <asm/irq.h> + +#include <asm/mach/irq.h> + +#include <mach/regs-irq.h> +#include <mach/regs-gpio.h> +#include <mach/regs-power.h> + +#include <plat/cpu.h> +#include <plat/irq.h> +#include <plat/pm.h> + +#define INTMSK(start, end) ((1 << ((end) + 1 - (start))) - 1) +#define INTMSK_SUB(start, end) (INTMSK(start, end) << ((start - S3C2410_IRQSUB(0)))) + +/* the s3c2412 changes the behaviour of IRQ_EINT0 through IRQ_EINT3 by + * having them turn up in both the INT* and the EINT* registers. Whilst + * both show the status, they both now need to be acked when the IRQs + * go off. +*/ + +static void +s3c2412_irq_mask(struct irq_data *data) +{ + unsigned long bitval = 1UL << (data->irq - IRQ_EINT0); + unsigned long mask; + + mask = __raw_readl(S3C2410_INTMSK); + __raw_writel(mask | bitval, S3C2410_INTMSK); + + mask = __raw_readl(S3C2412_EINTMASK); + __raw_writel(mask | bitval, S3C2412_EINTMASK); +} + +static inline void +s3c2412_irq_ack(struct irq_data *data) +{ + unsigned long bitval = 1UL << (data->irq - IRQ_EINT0); + + __raw_writel(bitval, S3C2412_EINTPEND); + __raw_writel(bitval, S3C2410_SRCPND); + __raw_writel(bitval, S3C2410_INTPND); +} + +static inline void +s3c2412_irq_maskack(struct irq_data *data) +{ + unsigned long bitval = 1UL << (data->irq - IRQ_EINT0); + unsigned long mask; + + mask = __raw_readl(S3C2410_INTMSK); + __raw_writel(mask|bitval, S3C2410_INTMSK); + + mask = __raw_readl(S3C2412_EINTMASK); + __raw_writel(mask | bitval, S3C2412_EINTMASK); + + __raw_writel(bitval, S3C2412_EINTPEND); + __raw_writel(bitval, S3C2410_SRCPND); + __raw_writel(bitval, S3C2410_INTPND); +} + +static void +s3c2412_irq_unmask(struct irq_data *data) +{ + unsigned long bitval = 1UL << (data->irq - IRQ_EINT0); + unsigned long mask; + + mask = __raw_readl(S3C2412_EINTMASK); + __raw_writel(mask & ~bitval, S3C2412_EINTMASK); + + mask = __raw_readl(S3C2410_INTMSK); + __raw_writel(mask & ~bitval, S3C2410_INTMSK); +} + +static struct irq_chip s3c2412_irq_eint0t4 = { + .irq_ack = s3c2412_irq_ack, + .irq_mask = s3c2412_irq_mask, + .irq_unmask = s3c2412_irq_unmask, + .irq_set_wake = s3c_irq_wake, + .irq_set_type = s3c_irqext_type, +}; + +#define INTBIT(x) (1 << ((x) - S3C2410_IRQSUB(0))) + +/* CF and SDI sub interrupts */ + +static void s3c2412_irq_demux_cfsdi(unsigned int irq, struct irq_desc *desc) +{ + unsigned int subsrc, submsk; + + subsrc = __raw_readl(S3C2410_SUBSRCPND); + submsk = __raw_readl(S3C2410_INTSUBMSK); + + subsrc &= ~submsk; + + if (subsrc & INTBIT(IRQ_S3C2412_SDI)) + generic_handle_irq(IRQ_S3C2412_SDI); + + if (subsrc & INTBIT(IRQ_S3C2412_CF)) + generic_handle_irq(IRQ_S3C2412_CF); +} + +#define INTMSK_CFSDI (1UL << (IRQ_S3C2412_CFSDI - IRQ_EINT0)) +#define SUBMSK_CFSDI INTMSK_SUB(IRQ_S3C2412_SDI, IRQ_S3C2412_CF) + +static void s3c2412_irq_cfsdi_mask(struct irq_data *data) +{ + s3c_irqsub_mask(data->irq, INTMSK_CFSDI, SUBMSK_CFSDI); +} + +static void s3c2412_irq_cfsdi_unmask(struct irq_data *data) +{ + s3c_irqsub_unmask(data->irq, INTMSK_CFSDI); +} + +static void s3c2412_irq_cfsdi_ack(struct irq_data *data) +{ + s3c_irqsub_maskack(data->irq, INTMSK_CFSDI, SUBMSK_CFSDI); +} + +static struct irq_chip s3c2412_irq_cfsdi = { + .name = "s3c2412-cfsdi", + .irq_ack = s3c2412_irq_cfsdi_ack, + .irq_mask = s3c2412_irq_cfsdi_mask, + .irq_unmask = s3c2412_irq_cfsdi_unmask, +}; + +static int s3c2412_irq_rtc_wake(struct irq_data *data, unsigned int state) +{ + unsigned long pwrcfg; + + pwrcfg = __raw_readl(S3C2412_PWRCFG); + if (state) + pwrcfg &= ~S3C2412_PWRCFG_RTC_MASKIRQ; + else + pwrcfg |= S3C2412_PWRCFG_RTC_MASKIRQ; + __raw_writel(pwrcfg, S3C2412_PWRCFG); + + return s3c_irq_chip.irq_set_wake(data, state); +} + +static struct irq_chip s3c2412_irq_rtc_chip; + +static int s3c2412_irq_add(struct device *dev, struct subsys_interface *sif) +{ + unsigned int irqno; + + for (irqno = IRQ_EINT0; irqno <= IRQ_EINT3; irqno++) { + irq_set_chip_and_handler(irqno, &s3c2412_irq_eint0t4, + handle_edge_irq); + set_irq_flags(irqno, IRQF_VALID); + } + + /* add demux support for CF/SDI */ + + irq_set_chained_handler(IRQ_S3C2412_CFSDI, s3c2412_irq_demux_cfsdi); + + for (irqno = IRQ_S3C2412_SDI; irqno <= IRQ_S3C2412_CF; irqno++) { + irq_set_chip_and_handler(irqno, &s3c2412_irq_cfsdi, + handle_level_irq); + set_irq_flags(irqno, IRQF_VALID); + } + + /* change RTC IRQ's set wake method */ + + s3c2412_irq_rtc_chip = s3c_irq_chip; + s3c2412_irq_rtc_chip.irq_set_wake = s3c2412_irq_rtc_wake; + + irq_set_chip(IRQ_RTC, &s3c2412_irq_rtc_chip); + + return 0; +} + +static struct subsys_interface s3c2412_irq_interface = { + .name = "s3c2412_irq", + .subsys = &s3c2412_subsys, + .add_dev = s3c2412_irq_add, +}; + +static int s3c2412_irq_init(void) +{ + return subsys_interface_register(&s3c2412_irq_interface); +} + +arch_initcall(s3c2412_irq_init); |