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   1 /* linux/arch/arm/mach-s3c2443/irq.c
   2  *
   3  * Copyright (c) 2007 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 <mach/hardware.h>
  29 #include <asm/irq.h>
  30 #include <asm/io.h>
  31
  32 #include <asm/mach/irq.h>
  33
  34 #include <mach/regs-irq.h>
  35 #include <mach/regs-gpio.h>
  36
  37 #include <asm/plat-s3c24xx/cpu.h>
  38 #include <asm/plat-s3c24xx/pm.h>
  39 #include <asm/plat-s3c24xx/irq.h>
  40
  41 #define INTMSK(start, end) ((1 << ((end) + 1 - (start))) - 1)
  42
  43 static inline void s3c2443_irq_demux(unsigned int irq, unsigned int len)
  44 {
  45         unsigned int subsrc, submsk;
  46         unsigned int end;
  47         struct irq_desc *mydesc;
  48
  49         /* read the current pending interrupts, and the mask
  50          * for what it is available */
  51
  52         subsrc = __raw_readl(S3C2410_SUBSRCPND);
  53         submsk = __raw_readl(S3C2410_INTSUBMSK);
  54
  55         subsrc  &= ~submsk;
  56         subsrc >>= (irq - S3C2410_IRQSUB(0));
  57         subsrc  &= (1 << len)-1;
  58
  59         end = len + irq;
  60         mydesc = irq_desc + irq;
  61
  62         for (; irq < end && subsrc; irq++) {
  63                 if (subsrc & 1)
  64                         desc_handle_irq(irq, mydesc);
  65
  66                 mydesc++;
  67                 subsrc >>= 1;
  68         }
  69 }
  70
  71 /* WDT/AC97 sub interrupts */
  72
  73 static void s3c2443_irq_demux_wdtac97(unsigned int irq, struct irq_desc *desc)
  74 {
  75         s3c2443_irq_demux(IRQ_S3C2443_WDT, 4);
  76 }
  77
  78 #define INTMSK_WDTAC97  (1UL << (IRQ_WDT - IRQ_EINT0))
  79 #define SUBMSK_WDTAC97  INTMSK(IRQ_S3C2443_WDT, IRQ_S3C2443_AC97)
  80
  81 static void s3c2443_irq_wdtac97_mask(unsigned int irqno)
  82 {
  83         s3c_irqsub_mask(irqno, INTMSK_WDTAC97, SUBMSK_WDTAC97);
  84 }
  85
  86 static void s3c2443_irq_wdtac97_unmask(unsigned int irqno)
  87 {
  88         s3c_irqsub_unmask(irqno, INTMSK_WDTAC97);
  89 }
  90
  91 static void s3c2443_irq_wdtac97_ack(unsigned int irqno)
  92 {
  93         s3c_irqsub_maskack(irqno, INTMSK_WDTAC97, SUBMSK_WDTAC97);
  94 }
  95
  96 static struct irq_chip s3c2443_irq_wdtac97 = {
  97         .mask       = s3c2443_irq_wdtac97_mask,
  98         .unmask     = s3c2443_irq_wdtac97_unmask,
  99         .ack        = s3c2443_irq_wdtac97_ack,
 100 };
 101
 102
 103 /* LCD sub interrupts */
 104
 105 static void s3c2443_irq_demux_lcd(unsigned int irq, struct irq_desc *desc)
 106 {
 107         s3c2443_irq_demux(IRQ_S3C2443_LCD1, 4);
 108 }
 109
 110 #define INTMSK_LCD      (1UL << (IRQ_LCD - IRQ_EINT0))
 111 #define SUBMSK_LCD      INTMSK(IRQ_S3C2443_LCD1, IRQ_S3C2443_LCD4)
 112
 113 static void s3c2443_irq_lcd_mask(unsigned int irqno)
 114 {
 115         s3c_irqsub_mask(irqno, INTMSK_LCD, SUBMSK_LCD);
 116 }
 117
 118 static void s3c2443_irq_lcd_unmask(unsigned int irqno)
 119 {
 120         s3c_irqsub_unmask(irqno, INTMSK_LCD);
 121 }
 122
 123 static void s3c2443_irq_lcd_ack(unsigned int irqno)
 124 {
 125         s3c_irqsub_maskack(irqno, INTMSK_LCD, SUBMSK_LCD);
 126 }
 127
 128 static struct irq_chip s3c2443_irq_lcd = {
 129         .mask       = s3c2443_irq_lcd_mask,
 130         .unmask     = s3c2443_irq_lcd_unmask,
 131         .ack        = s3c2443_irq_lcd_ack,
 132 };
 133
 134
 135 /* DMA sub interrupts */
 136
 137 static void s3c2443_irq_demux_dma(unsigned int irq, struct irq_desc *desc)
 138 {
 139         s3c2443_irq_demux(IRQ_S3C2443_DMA0, 6);
 140 }
 141
 142 #define INTMSK_DMA      (1UL << (IRQ_S3C2443_DMA - IRQ_EINT0))
 143 #define SUBMSK_DMA      INTMSK(IRQ_S3C2443_DMA0, IRQ_S3C2443_DMA5)
 144
 145
 146 static void s3c2443_irq_dma_mask(unsigned int irqno)
 147 {
 148         s3c_irqsub_mask(irqno, INTMSK_DMA, SUBMSK_DMA);
 149 }
 150
 151 static void s3c2443_irq_dma_unmask(unsigned int irqno)
 152 {
 153         s3c_irqsub_unmask(irqno, INTMSK_DMA);
 154 }
 155
 156 static void s3c2443_irq_dma_ack(unsigned int irqno)
 157 {
 158         s3c_irqsub_maskack(irqno, INTMSK_DMA, SUBMSK_DMA);
 159 }
 160
 161 static struct irq_chip s3c2443_irq_dma = {
 162         .mask       = s3c2443_irq_dma_mask,
 163         .unmask     = s3c2443_irq_dma_unmask,
 164         .ack        = s3c2443_irq_dma_ack,
 165 };
 166
 167
 168 /* UART3 sub interrupts */
 169
 170 static void s3c2443_irq_demux_uart3(unsigned int irq, struct irq_desc *desc)
 171 {
 172         s3c2443_irq_demux(IRQ_S3C2443_UART3, 3);
 173 }
 174
 175 #define INTMSK_UART3    (1UL << (IRQ_S3C2443_UART3 - IRQ_EINT0))
 176 #define SUBMSK_UART3    (0xf << (IRQ_S3C2443_RX3 - S3C2410_IRQSUB(0)))
 177
 178
 179 static void s3c2443_irq_uart3_mask(unsigned int irqno)
 180 {
 181         s3c_irqsub_mask(irqno, INTMSK_UART3, SUBMSK_UART3);
 182 }
 183
 184 static void s3c2443_irq_uart3_unmask(unsigned int irqno)
 185 {
 186         s3c_irqsub_unmask(irqno, INTMSK_UART3);
 187 }
 188
 189 static void s3c2443_irq_uart3_ack(unsigned int irqno)
 190 {
 191         s3c_irqsub_maskack(irqno, INTMSK_UART3, SUBMSK_UART3);
 192 }
 193
 194 static struct irq_chip s3c2443_irq_uart3 = {
 195         .mask       = s3c2443_irq_uart3_mask,
 196         .unmask     = s3c2443_irq_uart3_unmask,
 197         .ack        = s3c2443_irq_uart3_ack,
 198 };
 199
 200
 201 /* CAM sub interrupts */
 202
 203 static void s3c2443_irq_demux_cam(unsigned int irq, struct irq_desc *desc)
 204 {
 205         s3c2443_irq_demux(IRQ_S3C2440_CAM_C, 4);
 206 }
 207
 208 #define INTMSK_CAM      (1UL << (IRQ_CAM - IRQ_EINT0))
 209 #define SUBMSK_CAM      INTMSK(IRQ_S3C2440_CAM_C, IRQ_S3C2440_CAM_P)
 210
 211 static void s3c2443_irq_cam_mask(unsigned int irqno)
 212 {
 213         s3c_irqsub_mask(irqno, INTMSK_CAM, SUBMSK_CAM);
 214 }
 215
 216 static void s3c2443_irq_cam_unmask(unsigned int irqno)
 217 {
 218         s3c_irqsub_unmask(irqno, INTMSK_CAM);
 219 }
 220
 221 static void s3c2443_irq_cam_ack(unsigned int irqno)
 222 {
 223         s3c_irqsub_maskack(irqno, INTMSK_CAM, SUBMSK_CAM);
 224 }
 225
 226 static struct irq_chip s3c2443_irq_cam = {
 227         .mask       = s3c2443_irq_cam_mask,
 228         .unmask     = s3c2443_irq_cam_unmask,
 229         .ack        = s3c2443_irq_cam_ack,
 230 };
 231
 232 /* IRQ initialisation code */
 233
 234 static int __init s3c2443_add_sub(unsigned int base,
 235                                    void (*demux)(unsigned int,
 236                                                  struct irq_desc *),
 237                                    struct irq_chip *chip,
 238                                    unsigned int start, unsigned int end)
 239 {
 240         unsigned int irqno;
 241
 242         set_irq_chip(base, &s3c_irq_level_chip);
 243         set_irq_handler(base, handle_level_irq);
 244         set_irq_chained_handler(base, demux);
 245
 246         for (irqno = start; irqno <= end; irqno++) {
 247                 set_irq_chip(irqno, chip);
 248                 set_irq_handler(irqno, handle_level_irq);
 249                 set_irq_flags(irqno, IRQF_VALID);
 250         }
 251
 252         return 0;
 253 }
 254
 255 static int __init s3c2443_irq_add(struct sys_device *sysdev)
 256 {
 257         printk("S3C2443: IRQ Support\n");
 258
 259         s3c2443_add_sub(IRQ_CAM, s3c2443_irq_demux_cam, &s3c2443_irq_cam,
 260                         IRQ_S3C2440_CAM_C, IRQ_S3C2440_CAM_P);
 261
 262         s3c2443_add_sub(IRQ_LCD, s3c2443_irq_demux_lcd, &s3c2443_irq_lcd,
 263                         IRQ_S3C2443_LCD1, IRQ_S3C2443_LCD4);
 264
 265         s3c2443_add_sub(IRQ_S3C2443_DMA, s3c2443_irq_demux_dma,
 266                         &s3c2443_irq_dma, IRQ_S3C2443_DMA0, IRQ_S3C2443_DMA5);
 267
 268         s3c2443_add_sub(IRQ_S3C2443_UART3, s3c2443_irq_demux_uart3,
 269                         &s3c2443_irq_uart3,
 270                         IRQ_S3C2443_RX3, IRQ_S3C2443_ERR3);
 271
 272         s3c2443_add_sub(IRQ_WDT, s3c2443_irq_demux_wdtac97,
 273                         &s3c2443_irq_wdtac97,
 274                         IRQ_S3C2443_WDT, IRQ_S3C2443_AC97);
 275
 276         return 0;
 277 }
 278
 279 static struct sysdev_driver s3c2443_irq_driver = {
 280         .add            = s3c2443_irq_add,
 281 };
 282
 283 static int __init s3c2443_irq_init(void)
 284 {
 285         return sysdev_driver_register(&s3c2443_sysclass, &s3c2443_irq_driver);
 286 }
 287
 288 arch_initcall(s3c2443_irq_init);
 289