diff options
Diffstat (limited to 'arch/arm/plat-s3c24xx/irq.c')
| -rw-r--r-- | arch/arm/plat-s3c24xx/irq.c | 676 |
1 files changed, 676 insertions, 0 deletions
diff --git a/arch/arm/plat-s3c24xx/irq.c b/arch/arm/plat-s3c24xx/irq.c new file mode 100644 index 00000000..bc42c040 --- /dev/null +++ b/arch/arm/plat-s3c24xx/irq.c @@ -0,0 +1,676 @@ +/* linux/arch/arm/plat-s3c24xx/irq.c + * + * Copyright (c) 2003-2004 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/syscore_ops.h> + +#include <asm/irq.h> +#include <asm/mach/irq.h> + +#include <plat/regs-irqtype.h> + +#include <plat/cpu.h> +#include <plat/pm.h> +#include <plat/irq.h> + +static void +s3c_irq_mask(struct irq_data *data) +{ + unsigned int irqno = data->irq - IRQ_EINT0; + unsigned long mask; + + mask = __raw_readl(S3C2410_INTMSK); + mask |= 1UL << irqno; + __raw_writel(mask, S3C2410_INTMSK); +} + +static inline void +s3c_irq_ack(struct irq_data *data) +{ + unsigned long bitval = 1UL << (data->irq - IRQ_EINT0); + + __raw_writel(bitval, S3C2410_SRCPND); + __raw_writel(bitval, S3C2410_INTPND); +} + +static inline void +s3c_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); + + __raw_writel(bitval, S3C2410_SRCPND); + __raw_writel(bitval, S3C2410_INTPND); +} + + +static void +s3c_irq_unmask(struct irq_data *data) +{ + unsigned int irqno = data->irq; + unsigned long mask; + + if (irqno != IRQ_TIMER4 && irqno != IRQ_EINT8t23) + irqdbf2("s3c_irq_unmask %d\n", irqno); + + irqno -= IRQ_EINT0; + + mask = __raw_readl(S3C2410_INTMSK); + mask &= ~(1UL << irqno); + __raw_writel(mask, S3C2410_INTMSK); +} + +struct irq_chip s3c_irq_level_chip = { + .name = "s3c-level", + .irq_ack = s3c_irq_maskack, + .irq_mask = s3c_irq_mask, + .irq_unmask = s3c_irq_unmask, + .irq_set_wake = s3c_irq_wake +}; + +struct irq_chip s3c_irq_chip = { + .name = "s3c", + .irq_ack = s3c_irq_ack, + .irq_mask = s3c_irq_mask, + .irq_unmask = s3c_irq_unmask, + .irq_set_wake = s3c_irq_wake +}; + +static void +s3c_irqext_mask(struct irq_data *data) +{ + unsigned int irqno = data->irq - EXTINT_OFF; + unsigned long mask; + + mask = __raw_readl(S3C24XX_EINTMASK); + mask |= ( 1UL << irqno); + __raw_writel(mask, S3C24XX_EINTMASK); +} + +static void +s3c_irqext_ack(struct irq_data *data) +{ + unsigned long req; + unsigned long bit; + unsigned long mask; + + bit = 1UL << (data->irq - EXTINT_OFF); + + mask = __raw_readl(S3C24XX_EINTMASK); + + __raw_writel(bit, S3C24XX_EINTPEND); + + req = __raw_readl(S3C24XX_EINTPEND); + req &= ~mask; + + /* not sure if we should be acking the parent irq... */ + + if (data->irq <= IRQ_EINT7) { + if ((req & 0xf0) == 0) + s3c_irq_ack(irq_get_irq_data(IRQ_EINT4t7)); + } else { + if ((req >> 8) == 0) + s3c_irq_ack(irq_get_irq_data(IRQ_EINT8t23)); + } +} + +static void +s3c_irqext_unmask(struct irq_data *data) +{ + unsigned int irqno = data->irq - EXTINT_OFF; + unsigned long mask; + + mask = __raw_readl(S3C24XX_EINTMASK); + mask &= ~(1UL << irqno); + __raw_writel(mask, S3C24XX_EINTMASK); +} + +int +s3c_irqext_type(struct irq_data *data, unsigned int type) +{ + void __iomem *extint_reg; + void __iomem *gpcon_reg; + unsigned long gpcon_offset, extint_offset; + unsigned long newvalue = 0, value; + + if ((data->irq >= IRQ_EINT0) && (data->irq <= IRQ_EINT3)) { + gpcon_reg = S3C2410_GPFCON; + extint_reg = S3C24XX_EXTINT0; + gpcon_offset = (data->irq - IRQ_EINT0) * 2; + extint_offset = (data->irq - IRQ_EINT0) * 4; + } else if ((data->irq >= IRQ_EINT4) && (data->irq <= IRQ_EINT7)) { + gpcon_reg = S3C2410_GPFCON; + extint_reg = S3C24XX_EXTINT0; + gpcon_offset = (data->irq - (EXTINT_OFF)) * 2; + extint_offset = (data->irq - (EXTINT_OFF)) * 4; + } else if ((data->irq >= IRQ_EINT8) && (data->irq <= IRQ_EINT15)) { + gpcon_reg = S3C2410_GPGCON; + extint_reg = S3C24XX_EXTINT1; + gpcon_offset = (data->irq - IRQ_EINT8) * 2; + extint_offset = (data->irq - IRQ_EINT8) * 4; + } else if ((data->irq >= IRQ_EINT16) && (data->irq <= IRQ_EINT23)) { + gpcon_reg = S3C2410_GPGCON; + extint_reg = S3C24XX_EXTINT2; + gpcon_offset = (data->irq - IRQ_EINT8) * 2; + extint_offset = (data->irq - IRQ_EINT16) * 4; + } else { + return -1; + } + + /* Set the GPIO to external interrupt mode */ + value = __raw_readl(gpcon_reg); + value = (value & ~(3 << gpcon_offset)) | (0x02 << gpcon_offset); + __raw_writel(value, gpcon_reg); + + /* Set the external interrupt to pointed trigger type */ + switch (type) + { + case IRQ_TYPE_NONE: + printk(KERN_WARNING "No edge setting!\n"); + break; + + case IRQ_TYPE_EDGE_RISING: + newvalue = S3C2410_EXTINT_RISEEDGE; + break; + + case IRQ_TYPE_EDGE_FALLING: + newvalue = S3C2410_EXTINT_FALLEDGE; + break; + + case IRQ_TYPE_EDGE_BOTH: + newvalue = S3C2410_EXTINT_BOTHEDGE; + break; + + case IRQ_TYPE_LEVEL_LOW: + newvalue = S3C2410_EXTINT_LOWLEV; + break; + + case IRQ_TYPE_LEVEL_HIGH: + newvalue = S3C2410_EXTINT_HILEV; + break; + + default: + printk(KERN_ERR "No such irq type %d", type); + return -1; + } + + value = __raw_readl(extint_reg); + value = (value & ~(7 << extint_offset)) | (newvalue << extint_offset); + __raw_writel(value, extint_reg); + + return 0; +} + +static struct irq_chip s3c_irqext_chip = { + .name = "s3c-ext", + .irq_mask = s3c_irqext_mask, + .irq_unmask = s3c_irqext_unmask, + .irq_ack = s3c_irqext_ack, + .irq_set_type = s3c_irqext_type, + .irq_set_wake = s3c_irqext_wake +}; + +static struct irq_chip s3c_irq_eint0t4 = { + .name = "s3c-ext0", + .irq_ack = s3c_irq_ack, + .irq_mask = s3c_irq_mask, + .irq_unmask = s3c_irq_unmask, + .irq_set_wake = s3c_irq_wake, + .irq_set_type = s3c_irqext_type, +}; + +/* mask values for the parent registers for each of the interrupt types */ + +#define INTMSK_UART0 (1UL << (IRQ_UART0 - IRQ_EINT0)) +#define INTMSK_UART1 (1UL << (IRQ_UART1 - IRQ_EINT0)) +#define INTMSK_UART2 (1UL << (IRQ_UART2 - IRQ_EINT0)) +#define INTMSK_ADCPARENT (1UL << (IRQ_ADCPARENT - IRQ_EINT0)) + + +/* UART0 */ + +static void +s3c_irq_uart0_mask(struct irq_data *data) +{ + s3c_irqsub_mask(data->irq, INTMSK_UART0, 7); +} + +static void +s3c_irq_uart0_unmask(struct irq_data *data) +{ + s3c_irqsub_unmask(data->irq, INTMSK_UART0); +} + +static void +s3c_irq_uart0_ack(struct irq_data *data) +{ + s3c_irqsub_maskack(data->irq, INTMSK_UART0, 7); +} + +static struct irq_chip s3c_irq_uart0 = { + .name = "s3c-uart0", + .irq_mask = s3c_irq_uart0_mask, + .irq_unmask = s3c_irq_uart0_unmask, + .irq_ack = s3c_irq_uart0_ack, +}; + +/* UART1 */ + +static void +s3c_irq_uart1_mask(struct irq_data *data) +{ + s3c_irqsub_mask(data->irq, INTMSK_UART1, 7 << 3); +} + +static void +s3c_irq_uart1_unmask(struct irq_data *data) +{ + s3c_irqsub_unmask(data->irq, INTMSK_UART1); +} + +static void +s3c_irq_uart1_ack(struct irq_data *data) +{ + s3c_irqsub_maskack(data->irq, INTMSK_UART1, 7 << 3); +} + +static struct irq_chip s3c_irq_uart1 = { + .name = "s3c-uart1", + .irq_mask = s3c_irq_uart1_mask, + .irq_unmask = s3c_irq_uart1_unmask, + .irq_ack = s3c_irq_uart1_ack, +}; + +/* UART2 */ + +static void +s3c_irq_uart2_mask(struct irq_data *data) +{ + s3c_irqsub_mask(data->irq, INTMSK_UART2, 7 << 6); +} + +static void +s3c_irq_uart2_unmask(struct irq_data *data) +{ + s3c_irqsub_unmask(data->irq, INTMSK_UART2); +} + +static void +s3c_irq_uart2_ack(struct irq_data *data) +{ + s3c_irqsub_maskack(data->irq, INTMSK_UART2, 7 << 6); +} + +static struct irq_chip s3c_irq_uart2 = { + .name = "s3c-uart2", + .irq_mask = s3c_irq_uart2_mask, + .irq_unmask = s3c_irq_uart2_unmask, + .irq_ack = s3c_irq_uart2_ack, +}; + +/* ADC and Touchscreen */ + +static void +s3c_irq_adc_mask(struct irq_data *d) +{ + s3c_irqsub_mask(d->irq, INTMSK_ADCPARENT, 3 << 9); +} + +static void +s3c_irq_adc_unmask(struct irq_data *d) +{ + s3c_irqsub_unmask(d->irq, INTMSK_ADCPARENT); +} + +static void +s3c_irq_adc_ack(struct irq_data *d) +{ + s3c_irqsub_ack(d->irq, INTMSK_ADCPARENT, 3 << 9); +} + +static struct irq_chip s3c_irq_adc = { + .name = "s3c-adc", + .irq_mask = s3c_irq_adc_mask, + .irq_unmask = s3c_irq_adc_unmask, + .irq_ack = s3c_irq_adc_ack, +}; + +/* irq demux for adc */ +static void s3c_irq_demux_adc(unsigned int irq, + struct irq_desc *desc) +{ + unsigned int subsrc, submsk; + unsigned int offset = 9; + + /* read the current pending interrupts, and the mask + * for what it is available */ + + subsrc = __raw_readl(S3C2410_SUBSRCPND); + submsk = __raw_readl(S3C2410_INTSUBMSK); + + subsrc &= ~submsk; + subsrc >>= offset; + subsrc &= 3; + + if (subsrc != 0) { + if (subsrc & 1) { + generic_handle_irq(IRQ_TC); + } + if (subsrc & 2) { + generic_handle_irq(IRQ_ADC); + } + } +} + +static void s3c_irq_demux_uart(unsigned int start) +{ + unsigned int subsrc, submsk; + unsigned int offset = start - IRQ_S3CUART_RX0; + + /* read the current pending interrupts, and the mask + * for what it is available */ + + subsrc = __raw_readl(S3C2410_SUBSRCPND); + submsk = __raw_readl(S3C2410_INTSUBMSK); + + irqdbf2("s3c_irq_demux_uart: start=%d (%d), subsrc=0x%08x,0x%08x\n", + start, offset, subsrc, submsk); + + subsrc &= ~submsk; + subsrc >>= offset; + subsrc &= 7; + + if (subsrc != 0) { + if (subsrc & 1) + generic_handle_irq(start); + + if (subsrc & 2) + generic_handle_irq(start+1); + + if (subsrc & 4) + generic_handle_irq(start+2); + } +} + +/* uart demux entry points */ + +static void +s3c_irq_demux_uart0(unsigned int irq, + struct irq_desc *desc) +{ + irq = irq; + s3c_irq_demux_uart(IRQ_S3CUART_RX0); +} + +static void +s3c_irq_demux_uart1(unsigned int irq, + struct irq_desc *desc) +{ + irq = irq; + s3c_irq_demux_uart(IRQ_S3CUART_RX1); +} + +static void +s3c_irq_demux_uart2(unsigned int irq, + struct irq_desc *desc) +{ + irq = irq; + s3c_irq_demux_uart(IRQ_S3CUART_RX2); +} + +static void +s3c_irq_demux_extint8(unsigned int irq, + struct irq_desc *desc) +{ + unsigned long eintpnd = __raw_readl(S3C24XX_EINTPEND); + unsigned long eintmsk = __raw_readl(S3C24XX_EINTMASK); + + eintpnd &= ~eintmsk; + eintpnd &= ~0xff; /* ignore lower irqs */ + + /* we may as well handle all the pending IRQs here */ + + while (eintpnd) { + irq = __ffs(eintpnd); + eintpnd &= ~(1<<irq); + + irq += (IRQ_EINT4 - 4); + generic_handle_irq(irq); + } + +} + +static void +s3c_irq_demux_extint4t7(unsigned int irq, + struct irq_desc *desc) +{ + unsigned long eintpnd = __raw_readl(S3C24XX_EINTPEND); + unsigned long eintmsk = __raw_readl(S3C24XX_EINTMASK); + + eintpnd &= ~eintmsk; + eintpnd &= 0xff; /* only lower irqs */ + + /* we may as well handle all the pending IRQs here */ + + while (eintpnd) { + irq = __ffs(eintpnd); + eintpnd &= ~(1<<irq); + + irq += (IRQ_EINT4 - 4); + + generic_handle_irq(irq); + } +} + +#ifdef CONFIG_FIQ +/** + * s3c24xx_set_fiq - set the FIQ routing + * @irq: IRQ number to route to FIQ on processor. + * @on: Whether to route @irq to the FIQ, or to remove the FIQ routing. + * + * Change the state of the IRQ to FIQ routing depending on @irq and @on. If + * @on is true, the @irq is checked to see if it can be routed and the + * interrupt controller updated to route the IRQ. If @on is false, the FIQ + * routing is cleared, regardless of which @irq is specified. + */ +int s3c24xx_set_fiq(unsigned int irq, bool on) +{ + u32 intmod; + unsigned offs; + + if (on) { + offs = irq - FIQ_START; + if (offs > 31) + return -EINVAL; + + intmod = 1 << offs; + } else { + intmod = 0; + } + + __raw_writel(intmod, S3C2410_INTMOD); + return 0; +} + +EXPORT_SYMBOL_GPL(s3c24xx_set_fiq); +#endif + + +/* s3c24xx_init_irq + * + * Initialise S3C2410 IRQ system +*/ + +void __init s3c24xx_init_irq(void) +{ + unsigned long pend; + unsigned long last; + int irqno; + int i; + +#ifdef CONFIG_FIQ + init_FIQ(); +#endif + + irqdbf("s3c2410_init_irq: clearing interrupt status flags\n"); + + /* first, clear all interrupts pending... */ + + last = 0; + for (i = 0; i < 4; i++) { + pend = __raw_readl(S3C24XX_EINTPEND); + + if (pend == 0 || pend == last) + break; + + __raw_writel(pend, S3C24XX_EINTPEND); + printk("irq: clearing pending ext status %08x\n", (int)pend); + last = pend; + } + + last = 0; + for (i = 0; i < 4; i++) { + pend = __raw_readl(S3C2410_INTPND); + + if (pend == 0 || pend == last) + break; + + __raw_writel(pend, S3C2410_SRCPND); + __raw_writel(pend, S3C2410_INTPND); + printk("irq: clearing pending status %08x\n", (int)pend); + last = pend; + } + + last = 0; + for (i = 0; i < 4; i++) { + pend = __raw_readl(S3C2410_SUBSRCPND); + + if (pend == 0 || pend == last) + break; + + printk("irq: clearing subpending status %08x\n", (int)pend); + __raw_writel(pend, S3C2410_SUBSRCPND); + last = pend; + } + + /* register the main interrupts */ + + irqdbf("s3c2410_init_irq: registering s3c2410 interrupt handlers\n"); + + for (irqno = IRQ_EINT4t7; irqno <= IRQ_ADCPARENT; irqno++) { + /* set all the s3c2410 internal irqs */ + + switch (irqno) { + /* deal with the special IRQs (cascaded) */ + + case IRQ_EINT4t7: + case IRQ_EINT8t23: + case IRQ_UART0: + case IRQ_UART1: + case IRQ_UART2: + case IRQ_ADCPARENT: + irq_set_chip_and_handler(irqno, &s3c_irq_level_chip, + handle_level_irq); + break; + + case IRQ_RESERVED6: + case IRQ_RESERVED24: + /* no IRQ here */ + break; + + default: + //irqdbf("registering irq %d (s3c irq)\n", irqno); + irq_set_chip_and_handler(irqno, &s3c_irq_chip, + handle_edge_irq); + set_irq_flags(irqno, IRQF_VALID); + } + } + + /* setup the cascade irq handlers */ + + irq_set_chained_handler(IRQ_EINT4t7, s3c_irq_demux_extint4t7); + irq_set_chained_handler(IRQ_EINT8t23, s3c_irq_demux_extint8); + + irq_set_chained_handler(IRQ_UART0, s3c_irq_demux_uart0); + irq_set_chained_handler(IRQ_UART1, s3c_irq_demux_uart1); + irq_set_chained_handler(IRQ_UART2, s3c_irq_demux_uart2); + irq_set_chained_handler(IRQ_ADCPARENT, s3c_irq_demux_adc); + + /* external interrupts */ + + for (irqno = IRQ_EINT0; irqno <= IRQ_EINT3; irqno++) { + irqdbf("registering irq %d (ext int)\n", irqno); + irq_set_chip_and_handler(irqno, &s3c_irq_eint0t4, + handle_edge_irq); + set_irq_flags(irqno, IRQF_VALID); + } + + for (irqno = IRQ_EINT4; irqno <= IRQ_EINT23; irqno++) { + irqdbf("registering irq %d (extended s3c irq)\n", irqno); + irq_set_chip_and_handler(irqno, &s3c_irqext_chip, + handle_edge_irq); + set_irq_flags(irqno, IRQF_VALID); + } + + /* register the uart interrupts */ + + irqdbf("s3c2410: registering external interrupts\n"); + + for (irqno = IRQ_S3CUART_RX0; irqno <= IRQ_S3CUART_ERR0; irqno++) { + irqdbf("registering irq %d (s3c uart0 irq)\n", irqno); + irq_set_chip_and_handler(irqno, &s3c_irq_uart0, + handle_level_irq); + set_irq_flags(irqno, IRQF_VALID); + } + + for (irqno = IRQ_S3CUART_RX1; irqno <= IRQ_S3CUART_ERR1; irqno++) { + irqdbf("registering irq %d (s3c uart1 irq)\n", irqno); + irq_set_chip_and_handler(irqno, &s3c_irq_uart1, + handle_level_irq); + set_irq_flags(irqno, IRQF_VALID); + } + + for (irqno = IRQ_S3CUART_RX2; irqno <= IRQ_S3CUART_ERR2; irqno++) { + irqdbf("registering irq %d (s3c uart2 irq)\n", irqno); + irq_set_chip_and_handler(irqno, &s3c_irq_uart2, + handle_level_irq); + set_irq_flags(irqno, IRQF_VALID); + } + + for (irqno = IRQ_TC; irqno <= IRQ_ADC; irqno++) { + irqdbf("registering irq %d (s3c adc irq)\n", irqno); + irq_set_chip_and_handler(irqno, &s3c_irq_adc, handle_edge_irq); + set_irq_flags(irqno, IRQF_VALID); + } + + irqdbf("s3c2410: registered interrupt handlers\n"); +} + +struct syscore_ops s3c24xx_irq_syscore_ops = { + .suspend = s3c24xx_irq_suspend, + .resume = s3c24xx_irq_resume, +}; |