/* linux/arch/arm/mach-s3c2410/irq.c * * Copyright (c) 2003,2004 Simtec Electronics * Ben Dooks * * 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 * * Changelog: * * 22-Jul-2004 Ben Dooks * Fixed compile warnings * * 22-Jul-2004 Roc Wu * Fixed s3c_extirq_type * * 21-Jul-2004 Arnaud Patard (Rtp) * Addition of ADC/TC demux * * 04-Oct-2004 Klaus Fetscher * Fix for set_irq_type() on low EINT numbers * * 05-Oct-2004 Ben Dooks * Tidy up KF's patch and sort out new release * * 05-Oct-2004 Ben Dooks * Add support for power management controls * * 04-Nov-2004 Ben Dooks * Fix standard IRQ wake for EINT0..4 and RTC * * 22-Feb-2005 Ben Dooks * Fixed edge-triggering on ADC IRQ * * 28-Jun-2005 Ben Dooks * Mark IRQ_LCD valid * * 25-Jul-2005 Ben Dooks * Split the S3C2440 IRQ code to seperate file */ #include #include #include #include #include #include #include #include #include #include #include #include #include "cpu.h" #include "pm.h" #include "irq.h" /* wakeup irq control */ #ifdef CONFIG_PM /* state for IRQs over sleep */ /* default is to allow for EINT0..EINT15, and IRQ_RTC as wakeup sources * * set bit to 1 in allow bitfield to enable the wakeup settings on it */ unsigned long s3c_irqwake_intallow = 1L << (IRQ_RTC - IRQ_EINT0) | 0xfL; unsigned long s3c_irqwake_intmask = 0xffffffffL; unsigned long s3c_irqwake_eintallow = 0x0000fff0L; unsigned long s3c_irqwake_eintmask = 0xffffffffL; static int s3c_irq_wake(unsigned int irqno, unsigned int state) { unsigned long irqbit = 1 << (irqno - IRQ_EINT0); if (!(s3c_irqwake_intallow & irqbit)) return -ENOENT; printk(KERN_INFO "wake %s for irq %d\n", state ? "enabled" : "disabled", irqno); if (!state) s3c_irqwake_intmask |= irqbit; else s3c_irqwake_intmask &= ~irqbit; return 0; } static int s3c_irqext_wake(unsigned int irqno, unsigned int state) { unsigned long bit = 1L << (irqno - EXTINT_OFF); if (!(s3c_irqwake_eintallow & bit)) return -ENOENT; printk(KERN_INFO "wake %s for irq %d\n", state ? "enabled" : "disabled", irqno); if (!state) s3c_irqwake_eintmask |= bit; else s3c_irqwake_eintmask &= ~bit; return 0; } #else #define s3c_irqext_wake NULL #define s3c_irq_wake NULL #endif static void s3c_irq_mask(unsigned int irqno) { unsigned long mask; irqno -= IRQ_EINT0; mask = __raw_readl(S3C2410_INTMSK); mask |= 1UL << irqno; __raw_writel(mask, S3C2410_INTMSK); } static inline void s3c_irq_ack(unsigned int irqno) { unsigned long bitval = 1UL << (irqno - IRQ_EINT0); __raw_writel(bitval, S3C2410_SRCPND); __raw_writel(bitval, S3C2410_INTPND); } static inline void s3c_irq_maskack(unsigned int irqno) { unsigned long bitval = 1UL << (irqno - 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(unsigned int irqno) { 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 irqchip s3c_irq_level_chip = { .ack = s3c_irq_maskack, .mask = s3c_irq_mask, .unmask = s3c_irq_unmask, .set_wake = s3c_irq_wake }; static struct irqchip s3c_irq_chip = { .ack = s3c_irq_ack, .mask = s3c_irq_mask, .unmask = s3c_irq_unmask, .set_wake = s3c_irq_wake }; /* S3C2410_EINTMASK * S3C2410_EINTPEND */ static void s3c_irqext_mask(unsigned int irqno) { unsigned long mask; irqno -= EXTINT_OFF; mask = __raw_readl(S3C2410_EINTMASK); mask |= ( 1UL << irqno); __raw_writel(mask, S3C2410_EINTMASK); if (irqno <= (IRQ_EINT7 - EXTINT_OFF)) { /* check to see if all need masking */ if ((mask & (0xf << 4)) == (0xf << 4)) { /* all masked, mask the parent */ s3c_irq_mask(IRQ_EINT4t7); } } else { /* todo: the same check as above for the rest of the irq regs...*/ } } static void s3c_irqext_ack(unsigned int irqno) { unsigned long req; unsigned long bit; unsigned long mask; bit = 1UL << (irqno - EXTINT_OFF); mask = __raw_readl(S3C2410_EINTMASK); __raw_writel(bit, S3C2410_EINTPEND); req = __raw_readl(S3C2410_EINTPEND); req &= ~mask; /* not sure if we should be acking the parent irq... */ if (irqno <= IRQ_EINT7 ) { if ((req & 0xf0) == 0) s3c_irq_ack(IRQ_EINT4t7); } else { if ((req >> 8) == 0) s3c_irq_ack(IRQ_EINT8t23); } } static void s3c_irqext_unmask(unsigned int irqno) { unsigned long mask; irqno -= EXTINT_OFF; mask = __raw_readl(S3C2410_EINTMASK); mask &= ~( 1UL << irqno); __raw_writel(mask, S3C2410_EINTMASK); s3c_irq_unmask((irqno <= (IRQ_EINT7 - EXTINT_OFF)) ? IRQ_EINT4t7 : IRQ_EINT8t23); } static int s3c_irqext_type(unsigned int irq, unsigned int type) { void __iomem *extint_reg; void __iomem *gpcon_reg; unsigned long gpcon_offset, extint_offset; unsigned long newvalue = 0, value; if ((irq >= IRQ_EINT0) && (irq <= IRQ_EINT3)) { gpcon_reg = S3C2410_GPFCON; extint_reg = S3C2410_EXTINT0; gpcon_offset = (irq - IRQ_EINT0) * 2; extint_offset = (irq - IRQ_EINT0) * 4; } else if ((irq >= IRQ_EINT4) && (irq <= IRQ_EINT7)) { gpcon_reg = S3C2410_GPFCON; extint_reg = S3C2410_EXTINT0; gpcon_offset = (irq - (EXTINT_OFF)) * 2; extint_offset = (irq - (EXTINT_OFF)) * 4; } else if ((irq >= IRQ_EINT8) && (irq <= IRQ_EINT15)) { gpcon_reg = S3C2410_GPGCON; extint_reg = S3C2410_EXTINT1; gpcon_offset = (irq - IRQ_EINT8) * 2; extint_offset = (irq - IRQ_EINT8) * 4; } else if ((irq >= IRQ_EINT16) && (irq <= IRQ_EINT23)) { gpcon_reg = S3C2410_GPGCON; extint_reg = S3C2410_EXTINT2; gpcon_offset = (irq - IRQ_EINT8) * 2; extint_offset = (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 IRQT_NOEDGE: printk(KERN_WARNING "No edge setting!\n"); break; case IRQT_RISING: newvalue = S3C2410_EXTINT_RISEEDGE; break; case IRQT_FALLING: newvalue = S3C2410_EXTINT_FALLEDGE; break; case IRQT_BOTHEDGE: newvalue = S3C2410_EXTINT_BOTHEDGE; break; case IRQT_LOW: newvalue = S3C2410_EXTINT_LOWLEV; break; case IRQT_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 irqchip s3c_irqext_chip = { .mask = s3c_irqext_mask, .unmask = s3c_irqext_unmask, .ack = s3c_irqext_ack, .set_type = s3c_irqext_type, .set_wake = s3c_irqext_wake }; static struct irqchip s3c_irq_eint0t4 = { .ack = s3c_irq_ack, .mask = s3c_irq_mask, .unmask = s3c_irq_unmask, .set_wake = s3c_irq_wake, .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(unsigned int irqno) { s3c_irqsub_mask(irqno, INTMSK_UART0, 7); } static void s3c_irq_uart0_unmask(unsigned int irqno) { s3c_irqsub_unmask(irqno, INTMSK_UART0); } static void s3c_irq_uart0_ack(unsigned int irqno) { s3c_irqsub_maskack(irqno, INTMSK_UART0, 7); } static struct irqchip s3c_irq_uart0 = { .mask = s3c_irq_uart0_mask, .unmask = s3c_irq_uart0_unmask, .ack = s3c_irq_uart0_ack, }; /* UART1 */ static void s3c_irq_uart1_mask(unsigned int irqno) { s3c_irqsub_mask(irqno, INTMSK_UART1, 7 << 3); } static void s3c_irq_uart1_unmask(unsigned int irqno) { s3c_irqsub_unmask(irqno, INTMSK_UART1); } static void s3c_irq_uart1_ack(unsigned int irqno) { s3c_irqsub_maskack(irqno, INTMSK_UART1, 7 << 3); } static struct irqchip s3c_irq_uart1 = { .mask = s3c_irq_uart1_mask, .unmask = s3c_irq_uart1_unmask, .ack = s3c_irq_uart1_ack, }; /* UART2 */ static void s3c_irq_uart2_mask(unsigned int irqno) { s3c_irqsub_mask(irqno, INTMSK_UART2, 7 << 6); } static void s3c_irq_uart2_unmask(unsigned int irqno) { s3c_irqsub_unmask(irqno, INTMSK_UART2); } static void s3c_irq_uart2_ack(unsigned int irqno) { s3c_irqsub_maskack(irqno, INTMSK_UART2, 7 << 6); } static struct irqchip s3c_irq_uart2 = { .mask = s3c_irq_uart2_mask, .unmask = s3c_irq_uart2_unmask, .ack = s3c_irq_uart2_ack, }; /* ADC and Touchscreen */ static void s3c_irq_adc_mask(unsigned int irqno) { s3c_irqsub_mask(irqno, INTMSK_ADCPARENT, 3 << 9); } static void s3c_irq_adc_unmask(unsigned int irqno) { s3c_irqsub_unmask(irqno, INTMSK_ADCPARENT); } static void s3c_irq_adc_ack(unsigned int irqno) { s3c_irqsub_ack(irqno, INTMSK_ADCPARENT, 3 << 9); } static struct irqchip s3c_irq_adc = { .mask = s3c_irq_adc_mask, .unmask = s3c_irq_adc_unmask, .ack = s3c_irq_adc_ack, }; /* irq demux for adc */ static void s3c_irq_demux_adc(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs) { unsigned int subsrc, submsk; unsigned int offset = 9; struct irqdesc *mydesc; /* 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) { mydesc = irq_desc + IRQ_TC; desc_handle_irq(IRQ_TC, mydesc, regs); } if (subsrc & 2) { mydesc = irq_desc + IRQ_ADC; desc_handle_irq(IRQ_ADC, mydesc, regs); } } } static void s3c_irq_demux_uart(unsigned int start, struct pt_regs *regs) { unsigned int subsrc, submsk; unsigned int offset = start - IRQ_S3CUART_RX0; struct irqdesc *desc; /* 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) { desc = irq_desc + start; if (subsrc & 1) desc_handle_irq(start, desc, regs); desc++; if (subsrc & 2) desc_handle_irq(start+1, desc, regs); desc++; if (subsrc & 4) desc_handle_irq(start+2, desc, regs); } } /* uart demux entry points */ static void s3c_irq_demux_uart0(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs) { irq = irq; s3c_irq_demux_uart(IRQ_S3CUART_RX0, regs); } static void s3c_irq_demux_uart1(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs) { irq = irq; s3c_irq_demux_uart(IRQ_S3CUART_RX1, regs); } static void s3c_irq_demux_uart2(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs) { irq = irq; s3c_irq_demux_uart(IRQ_S3CUART_RX2, regs); } /* s3c24xx_init_irq * * Initialise S3C2410 IRQ system */ void __init s3c24xx_init_irq(void) { unsigned long pend; unsigned long last; int irqno; int i; 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(S3C2410_EINTPEND); if (pend == 0 || pend == last) break; __raw_writel(pend, S3C2410_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_BATT_FLT; irqno <= IRQ_ADCPARENT; irqno++) { /* set all the s3c2410 internal irqs */ switch (irqno) { /* deal with the special IRQs (cascaded) */ case IRQ_UART0: case IRQ_UART1: case IRQ_UART2: case IRQ_ADCPARENT: set_irq_chip(irqno, &s3c_irq_level_chip); set_irq_handler(irqno, do_level_IRQ); break; case IRQ_RESERVED6: case IRQ_RESERVED24: /* no IRQ here */ break; default: //irqdbf("registering irq %d (s3c irq)\n", irqno); set_irq_chip(irqno, &s3c_irq_chip); set_irq_handler(irqno, do_edge_IRQ); set_irq_flags(irqno, IRQF_VALID); } } /* setup the cascade irq handlers */ set_irq_chained_handler(IRQ_UART0, s3c_irq_demux_uart0); set_irq_chained_handler(IRQ_UART1, s3c_irq_demux_uart1); set_irq_chained_handler(IRQ_UART2, s3c_irq_demux_uart2); set_irq_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); set_irq_chip(irqno, &s3c_irq_eint0t4); set_irq_handler(irqno, do_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); set_irq_chip(irqno, &s3c_irqext_chip); set_irq_handler(irqno, do_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); set_irq_chip(irqno, &s3c_irq_uart0); set_irq_handler(irqno, do_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); set_irq_chip(irqno, &s3c_irq_uart1); set_irq_handler(irqno, do_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); set_irq_chip(irqno, &s3c_irq_uart2); set_irq_handler(irqno, do_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); set_irq_chip(irqno, &s3c_irq_adc); set_irq_handler(irqno, do_edge_IRQ); set_irq_flags(irqno, IRQF_VALID); } irqdbf("s3c2410: registered interrupt handlers\n"); }