arch/arm/mach-s3c2412/irq.c

   1 /* linux/arch/arm/mach-s3c2412/irq.c
   2  *
   3  * Copyright (c) 2006 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20 */
  21
  22 #include <linux/init.h>
  23 #include <linux/module.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/ioport.h>
  26 #include <linux/sysdev.h>
  27
  28 #include <asm/hardware.h>
  29 #include <asm/irq.h>
  30 #include <asm/io.h>
  31
  32 #include <asm/mach/irq.h>
  33
  34 #include <asm/arch/regs-irq.h>
  35 #include <asm/arch/regs-gpio.h>
  36
  37 #include <asm/plat-s3c24xx/cpu.h>
  38 #include <asm/plat-s3c24xx/irq.h>
  39 #include <asm/plat-s3c24xx/pm.h>
  40
  41 #define INTMSK(start, end) ((1 << ((end) + 1 - (start))) - 1)
  42 #define INTMSK_SUB(start, end) (INTMSK(start, end) << ((start - S3C2410_IRQSUB(0))))
  43
  44 /* the s3c2412 changes the behaviour of IRQ_EINT0 through IRQ_EINT3 by
  45  * having them turn up in both the INT* and the EINT* registers. Whilst
  46  * both show the status, they both now need to be acked when the IRQs
  47  * go off.
  48 */
  49
  50 static void
  51 s3c2412_irq_mask(unsigned int irqno)
  52 {
  53         unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
  54         unsigned long mask;
  55
  56         mask = __raw_readl(S3C2410_INTMSK);
  57         __raw_writel(mask | bitval, S3C2410_INTMSK);
  58
  59         mask = __raw_readl(S3C2412_EINTMASK);
  60         __raw_writel(mask | bitval, S3C2412_EINTMASK);
  61 }
  62
  63 static inline void
  64 s3c2412_irq_ack(unsigned int irqno)
  65 {
  66         unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
  67
  68         __raw_writel(bitval, S3C2412_EINTPEND);
  69         __raw_writel(bitval, S3C2410_SRCPND);
  70         __raw_writel(bitval, S3C2410_INTPND);
  71 }
  72
  73 static inline void
  74 s3c2412_irq_maskack(unsigned int irqno)
  75 {
  76         unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
  77         unsigned long mask;
  78
  79         mask = __raw_readl(S3C2410_INTMSK);
  80         __raw_writel(mask|bitval, S3C2410_INTMSK);
  81
  82         mask = __raw_readl(S3C2412_EINTMASK);
  83         __raw_writel(mask | bitval, S3C2412_EINTMASK);
  84
  85         __raw_writel(bitval, S3C2412_EINTPEND);
  86         __raw_writel(bitval, S3C2410_SRCPND);
  87         __raw_writel(bitval, S3C2410_INTPND);
  88 }
  89
  90 static void
  91 s3c2412_irq_unmask(unsigned int irqno)
  92 {
  93         unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
  94         unsigned long mask;
  95
  96         mask = __raw_readl(S3C2412_EINTMASK);
  97         __raw_writel(mask & ~bitval, S3C2412_EINTMASK);
  98
  99         mask = __raw_readl(S3C2410_INTMSK);
 100         __raw_writel(mask & ~bitval, S3C2410_INTMSK);
 101 }
 102
 103 static struct irq_chip s3c2412_irq_eint0t4 = {
 104         .ack       = s3c2412_irq_ack,
 105         .mask      = s3c2412_irq_mask,
 106         .unmask    = s3c2412_irq_unmask,
 107         .set_wake  = s3c_irq_wake,
 108         .set_type  = s3c_irqext_type,
 109 };
 110
 111 #define INTBIT(x)       (1 << ((x) - S3C2410_IRQSUB(0)))
 112
 113 /* CF and SDI sub interrupts */
 114
 115 static void s3c2412_irq_demux_cfsdi(unsigned int irq, struct irq_desc *desc)
 116 {
 117         unsigned int subsrc, submsk;
 118
 119         subsrc = __raw_readl(S3C2410_SUBSRCPND);
 120         submsk = __raw_readl(S3C2410_INTSUBMSK);
 121
 122         subsrc  &= ~submsk;
 123
 124         if (subsrc & INTBIT(IRQ_S3C2412_SDI))
 125                 desc_handle_irq(IRQ_S3C2412_SDI, irq_desc + IRQ_S3C2412_SDI);
 126
 127         if (subsrc & INTBIT(IRQ_S3C2412_CF))
 128                 desc_handle_irq(IRQ_S3C2412_CF, irq_desc + IRQ_S3C2412_CF);
 129 }
 130
 131 #define INTMSK_CFSDI    (1UL << (IRQ_S3C2412_CFSDI - IRQ_EINT0))
 132 #define SUBMSK_CFSDI    INTMSK_SUB(IRQ_S3C2412_SDI, IRQ_S3C2412_CF)
 133
 134 static void s3c2412_irq_cfsdi_mask(unsigned int irqno)
 135 {
 136         s3c_irqsub_mask(irqno, INTMSK_CFSDI, SUBMSK_CFSDI);
 137 }
 138
 139 static void s3c2412_irq_cfsdi_unmask(unsigned int irqno)
 140 {
 141         s3c_irqsub_unmask(irqno, INTMSK_CFSDI);
 142 }
 143
 144 static void s3c2412_irq_cfsdi_ack(unsigned int irqno)
 145 {
 146         s3c_irqsub_maskack(irqno, INTMSK_CFSDI, SUBMSK_CFSDI);
 147 }
 148
 149 static struct irq_chip s3c2412_irq_cfsdi = {
 150         .name           = "s3c2412-cfsdi",
 151         .ack            = s3c2412_irq_cfsdi_ack,
 152         .mask           = s3c2412_irq_cfsdi_mask,
 153         .unmask         = s3c2412_irq_cfsdi_unmask,
 154 };
 155
 156 static int s3c2412_irq_add(struct sys_device *sysdev)
 157 {
 158         unsigned int irqno;
 159
 160         for (irqno = IRQ_EINT0; irqno <= IRQ_EINT3; irqno++) {
 161                 set_irq_chip(irqno, &s3c2412_irq_eint0t4);
 162                 set_irq_handler(irqno, handle_edge_irq);
 163                 set_irq_flags(irqno, IRQF_VALID);
 164         }
 165
 166         /* add demux support for CF/SDI */
 167
 168         set_irq_chained_handler(IRQ_S3C2412_CFSDI, s3c2412_irq_demux_cfsdi);
 169
 170         for (irqno = IRQ_S3C2412_SDI; irqno <= IRQ_S3C2412_CF; irqno++) {
 171                 set_irq_chip(irqno, &s3c2412_irq_cfsdi);
 172                 set_irq_handler(irqno, handle_level_irq);
 173                 set_irq_flags(irqno, IRQF_VALID);
 174         }
 175
 176         return 0;
 177 }
 178
 179 static struct sysdev_driver s3c2412_irq_driver = {
 180         .add            = s3c2412_irq_add,
 181         .suspend        = s3c24xx_irq_suspend,
 182         .resume         = s3c24xx_irq_resume,
 183 };
 184
 185 static int s3c2412_irq_init(void)
 186 {
 187         return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_irq_driver);
 188 }
 189
 190 arch_initcall(s3c2412_irq_init);