release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-s3c2416/irq.c

   1 /* linux/arch/arm/mach-s3c2416/irq.c
   2  *
   3  * Copyright (c) 2009 Yauhen Kharuzhy <jekhor@gmail.com>,
   4  *      as part of OpenInkpot project
   5  * Copyright (c) 2009 Promwad Innovation Company
   6  *      Yauhen Kharuzhy <yauhen.kharuzhy@promwad.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22 */
  23
  24 #include <linux/init.h>
  25 #include <linux/module.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/ioport.h>
  28 #include <linux/sysdev.h>
  29 #include <linux/io.h>
  30
  31 #include <mach/hardware.h>
  32 #include <asm/irq.h>
  33
  34 #include <asm/mach/irq.h>
  35
  36 #include <mach/regs-irq.h>
  37 #include <mach/regs-gpio.h>
  38
  39 #include <plat/cpu.h>
  40 #include <plat/pm.h>
  41 #include <plat/irq.h>
  42
  43 #define INTMSK(start, end) ((1 << ((end) + 1 - (start))) - 1)
  44
  45 static inline void s3c2416_irq_demux(unsigned int irq, unsigned int len)
  46 {
  47         unsigned int subsrc, submsk;
  48         unsigned int end;
  49
  50         /* read the current pending interrupts, and the mask
  51          * for what it is available */
  52
  53         subsrc = __raw_readl(S3C2410_SUBSRCPND);
  54         submsk = __raw_readl(S3C2410_INTSUBMSK);
  55
  56         subsrc  &= ~submsk;
  57         subsrc >>= (irq - S3C2410_IRQSUB(0));
  58         subsrc  &= (1 << len)-1;
  59
  60         end = len + irq;
  61
  62         for (; irq < end && subsrc; irq++) {
  63                 if (subsrc & 1)
  64                         generic_handle_irq(irq);
  65
  66                 subsrc >>= 1;
  67         }
  68 }
  69
  70 /* WDT/AC97 sub interrupts */
  71
  72 static void s3c2416_irq_demux_wdtac97(unsigned int irq, struct irq_desc *desc)
  73 {
  74         s3c2416_irq_demux(IRQ_S3C2443_WDT, 4);
  75 }
  76
  77 #define INTMSK_WDTAC97  (1UL << (IRQ_WDT - IRQ_EINT0))
  78 #define SUBMSK_WDTAC97  INTMSK(IRQ_S3C2443_WDT, IRQ_S3C2443_AC97)
  79
  80 static void s3c2416_irq_wdtac97_mask(unsigned int irqno)
  81 {
  82         s3c_irqsub_mask(irqno, INTMSK_WDTAC97, SUBMSK_WDTAC97);
  83 }
  84
  85 static void s3c2416_irq_wdtac97_unmask(unsigned int irqno)
  86 {
  87         s3c_irqsub_unmask(irqno, INTMSK_WDTAC97);
  88 }
  89
  90 static void s3c2416_irq_wdtac97_ack(unsigned int irqno)
  91 {
  92         s3c_irqsub_maskack(irqno, INTMSK_WDTAC97, SUBMSK_WDTAC97);
  93 }
  94
  95 static struct irq_chip s3c2416_irq_wdtac97 = {
  96         .mask       = s3c2416_irq_wdtac97_mask,
  97         .unmask     = s3c2416_irq_wdtac97_unmask,
  98         .ack        = s3c2416_irq_wdtac97_ack,
  99 };
 100
 101
 102 /* LCD sub interrupts */
 103
 104 static void s3c2416_irq_demux_lcd(unsigned int irq, struct irq_desc *desc)
 105 {
 106         s3c2416_irq_demux(IRQ_S3C2443_LCD1, 4);
 107 }
 108
 109 #define INTMSK_LCD      (1UL << (IRQ_LCD - IRQ_EINT0))
 110 #define SUBMSK_LCD      INTMSK(IRQ_S3C2443_LCD1, IRQ_S3C2443_LCD4)
 111
 112 static void s3c2416_irq_lcd_mask(unsigned int irqno)
 113 {
 114         s3c_irqsub_mask(irqno, INTMSK_LCD, SUBMSK_LCD);
 115 }
 116
 117 static void s3c2416_irq_lcd_unmask(unsigned int irqno)
 118 {
 119         s3c_irqsub_unmask(irqno, INTMSK_LCD);
 120 }
 121
 122 static void s3c2416_irq_lcd_ack(unsigned int irqno)
 123 {
 124         s3c_irqsub_maskack(irqno, INTMSK_LCD, SUBMSK_LCD);
 125 }
 126
 127 static struct irq_chip s3c2416_irq_lcd = {
 128         .mask       = s3c2416_irq_lcd_mask,
 129         .unmask     = s3c2416_irq_lcd_unmask,
 130         .ack        = s3c2416_irq_lcd_ack,
 131 };
 132
 133
 134 /* DMA sub interrupts */
 135
 136 static void s3c2416_irq_demux_dma(unsigned int irq, struct irq_desc *desc)
 137 {
 138         s3c2416_irq_demux(IRQ_S3C2443_DMA0, 6);
 139 }
 140
 141 #define INTMSK_DMA      (1UL << (IRQ_S3C2443_DMA - IRQ_EINT0))
 142 #define SUBMSK_DMA      INTMSK(IRQ_S3C2443_DMA0, IRQ_S3C2443_DMA5)
 143
 144
 145 static void s3c2416_irq_dma_mask(unsigned int irqno)
 146 {
 147         s3c_irqsub_mask(irqno, INTMSK_DMA, SUBMSK_DMA);
 148 }
 149
 150 static void s3c2416_irq_dma_unmask(unsigned int irqno)
 151 {
 152         s3c_irqsub_unmask(irqno, INTMSK_DMA);
 153 }
 154
 155 static void s3c2416_irq_dma_ack(unsigned int irqno)
 156 {
 157         s3c_irqsub_maskack(irqno, INTMSK_DMA, SUBMSK_DMA);
 158 }
 159
 160 static struct irq_chip s3c2416_irq_dma = {
 161         .mask       = s3c2416_irq_dma_mask,
 162         .unmask     = s3c2416_irq_dma_unmask,
 163         .ack        = s3c2416_irq_dma_ack,
 164 };
 165
 166
 167 /* UART3 sub interrupts */
 168
 169 static void s3c2416_irq_demux_uart3(unsigned int irq, struct irq_desc *desc)
 170 {
 171         s3c2416_irq_demux(IRQ_S3C2443_UART3, 3);
 172 }
 173
 174 #define INTMSK_UART3    (1UL << (IRQ_S3C2443_UART3 - IRQ_EINT0))
 175 #define SUBMSK_UART3    (0xf << (IRQ_S3C2443_RX3 - S3C2410_IRQSUB(0)))
 176
 177
 178 static void s3c2416_irq_uart3_mask(unsigned int irqno)
 179 {
 180         s3c_irqsub_mask(irqno, INTMSK_UART3, SUBMSK_UART3);
 181 }
 182
 183 static void s3c2416_irq_uart3_unmask(unsigned int irqno)
 184 {
 185         s3c_irqsub_unmask(irqno, INTMSK_UART3);
 186 }
 187
 188 static void s3c2416_irq_uart3_ack(unsigned int irqno)
 189 {
 190         s3c_irqsub_maskack(irqno, INTMSK_UART3, SUBMSK_UART3);
 191 }
 192
 193 static struct irq_chip s3c2416_irq_uart3 = {
 194         .mask       = s3c2416_irq_uart3_mask,
 195         .unmask     = s3c2416_irq_uart3_unmask,
 196         .ack        = s3c2416_irq_uart3_ack,
 197 };
 198
 199
 200 /* IRQ initialisation code */
 201
 202 static int __init s3c2416_add_sub(unsigned int base,
 203                                    void (*demux)(unsigned int,
 204                                                  struct irq_desc *),
 205                                    struct irq_chip *chip,
 206                                    unsigned int start, unsigned int end)
 207 {
 208         unsigned int irqno;
 209
 210         set_irq_chip(base, &s3c_irq_level_chip);
 211         set_irq_handler(base, handle_level_irq);
 212         set_irq_chained_handler(base, demux);
 213
 214         for (irqno = start; irqno <= end; irqno++) {
 215                 set_irq_chip(irqno, chip);
 216                 set_irq_handler(irqno, handle_level_irq);
 217                 set_irq_flags(irqno, IRQF_VALID);
 218         }
 219
 220         return 0;
 221 }
 222
 223 static int __init s3c2416_irq_add(struct sys_device *sysdev)
 224 {
 225         printk(KERN_INFO "S3C2416: IRQ Support\n");
 226
 227         s3c2416_add_sub(IRQ_LCD, s3c2416_irq_demux_lcd, &s3c2416_irq_lcd,
 228                         IRQ_S3C2443_LCD2, IRQ_S3C2443_LCD4);
 229
 230         s3c2416_add_sub(IRQ_S3C2443_DMA, s3c2416_irq_demux_dma,
 231                         &s3c2416_irq_dma, IRQ_S3C2443_DMA0, IRQ_S3C2443_DMA5);
 232
 233         s3c2416_add_sub(IRQ_S3C2443_UART3, s3c2416_irq_demux_uart3,
 234                         &s3c2416_irq_uart3,
 235                         IRQ_S3C2443_RX3, IRQ_S3C2443_ERR3);
 236
 237         s3c2416_add_sub(IRQ_WDT, s3c2416_irq_demux_wdtac97,
 238                         &s3c2416_irq_wdtac97,
 239                         IRQ_S3C2443_WDT, IRQ_S3C2443_AC97);
 240
 241         return 0;
 242 }
 243
 244 static struct sysdev_driver s3c2416_irq_driver = {
 245         .add            = s3c2416_irq_add,
 246 };
 247
 248 static int __init s3c2416_irq_init(void)
 249 {
 250         return sysdev_driver_register(&s3c2416_sysclass, &s3c2416_irq_driver);
 251 }
 252
 253 arch_initcall(s3c2416_irq_init);