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/device.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(struct irq_data *data)
  81 {
  82         s3c_irqsub_mask(data->irq, INTMSK_WDTAC97, SUBMSK_WDTAC97);
  83 }
  84
  85 static void s3c2416_irq_wdtac97_unmask(struct irq_data *data)
  86 {
  87         s3c_irqsub_unmask(data->irq, INTMSK_WDTAC97);
  88 }
  89
  90 static void s3c2416_irq_wdtac97_ack(struct irq_data *data)
  91 {
  92         s3c_irqsub_maskack(data->irq, INTMSK_WDTAC97, SUBMSK_WDTAC97);
  93 }
  94
  95 static struct irq_chip s3c2416_irq_wdtac97 = {
  96         .irq_mask       = s3c2416_irq_wdtac97_mask,
  97         .irq_unmask     = s3c2416_irq_wdtac97_unmask,
  98         .irq_ack        = s3c2416_irq_wdtac97_ack,
  99 };
 100
 101 /* LCD sub interrupts */
 102
 103 static void s3c2416_irq_demux_lcd(unsigned int irq, struct irq_desc *desc)
 104 {
 105         s3c2416_irq_demux(IRQ_S3C2443_LCD1, 4);
 106 }
 107
 108 #define INTMSK_LCD      (1UL << (IRQ_LCD - IRQ_EINT0))
 109 #define SUBMSK_LCD      INTMSK(IRQ_S3C2443_LCD1, IRQ_S3C2443_LCD4)
 110
 111 static void s3c2416_irq_lcd_mask(struct irq_data *data)
 112 {
 113         s3c_irqsub_mask(data->irq, INTMSK_LCD, SUBMSK_LCD);
 114 }
 115
 116 static void s3c2416_irq_lcd_unmask(struct irq_data *data)
 117 {
 118         s3c_irqsub_unmask(data->irq, INTMSK_LCD);
 119 }
 120
 121 static void s3c2416_irq_lcd_ack(struct irq_data *data)
 122 {
 123         s3c_irqsub_maskack(data->irq, INTMSK_LCD, SUBMSK_LCD);
 124 }
 125
 126 static struct irq_chip s3c2416_irq_lcd = {
 127         .irq_mask       = s3c2416_irq_lcd_mask,
 128         .irq_unmask     = s3c2416_irq_lcd_unmask,
 129         .irq_ack        = s3c2416_irq_lcd_ack,
 130 };
 131
 132 /* DMA sub interrupts */
 133
 134 static void s3c2416_irq_demux_dma(unsigned int irq, struct irq_desc *desc)
 135 {
 136         s3c2416_irq_demux(IRQ_S3C2443_DMA0, 6);
 137 }
 138
 139 #define INTMSK_DMA      (1UL << (IRQ_S3C2443_DMA - IRQ_EINT0))
 140 #define SUBMSK_DMA      INTMSK(IRQ_S3C2443_DMA0, IRQ_S3C2443_DMA5)
 141
 142
 143 static void s3c2416_irq_dma_mask(struct irq_data *data)
 144 {
 145         s3c_irqsub_mask(data->irq, INTMSK_DMA, SUBMSK_DMA);
 146 }
 147
 148 static void s3c2416_irq_dma_unmask(struct irq_data *data)
 149 {
 150         s3c_irqsub_unmask(data->irq, INTMSK_DMA);
 151 }
 152
 153 static void s3c2416_irq_dma_ack(struct irq_data *data)
 154 {
 155         s3c_irqsub_maskack(data->irq, INTMSK_DMA, SUBMSK_DMA);
 156 }
 157
 158 static struct irq_chip s3c2416_irq_dma = {
 159         .irq_mask       = s3c2416_irq_dma_mask,
 160         .irq_unmask     = s3c2416_irq_dma_unmask,
 161         .irq_ack        = s3c2416_irq_dma_ack,
 162 };
 163
 164 /* UART3 sub interrupts */
 165
 166 static void s3c2416_irq_demux_uart3(unsigned int irq, struct irq_desc *desc)
 167 {
 168         s3c2416_irq_demux(IRQ_S3C2443_RX3, 3);
 169 }
 170
 171 #define INTMSK_UART3    (1UL << (IRQ_S3C2443_UART3 - IRQ_EINT0))
 172 #define SUBMSK_UART3    (0x7 << (IRQ_S3C2443_RX3 - S3C2410_IRQSUB(0)))
 173
 174 static void s3c2416_irq_uart3_mask(struct irq_data *data)
 175 {
 176         s3c_irqsub_mask(data->irq, INTMSK_UART3, SUBMSK_UART3);
 177 }
 178
 179 static void s3c2416_irq_uart3_unmask(struct irq_data *data)
 180 {
 181         s3c_irqsub_unmask(data->irq, INTMSK_UART3);
 182 }
 183
 184 static void s3c2416_irq_uart3_ack(struct irq_data *data)
 185 {
 186         s3c_irqsub_maskack(data->irq, INTMSK_UART3, SUBMSK_UART3);
 187 }
 188
 189 static struct irq_chip s3c2416_irq_uart3 = {
 190         .irq_mask       = s3c2416_irq_uart3_mask,
 191         .irq_unmask     = s3c2416_irq_uart3_unmask,
 192         .irq_ack        = s3c2416_irq_uart3_ack,
 193 };
 194
 195 /* IRQ initialisation code */
 196
 197 static int __init s3c2416_add_sub(unsigned int base,
 198                                    void (*demux)(unsigned int,
 199                                                  struct irq_desc *),
 200                                    struct irq_chip *chip,
 201                                    unsigned int start, unsigned int end)
 202 {
 203         unsigned int irqno;
 204
 205         irq_set_chip_and_handler(base, &s3c_irq_level_chip, handle_level_irq);
 206         irq_set_chained_handler(base, demux);
 207
 208         for (irqno = start; irqno <= end; irqno++) {
 209                 irq_set_chip_and_handler(irqno, chip, handle_level_irq);
 210                 set_irq_flags(irqno, IRQF_VALID);
 211         }
 212
 213         return 0;
 214 }
 215
 216 static int __init s3c2416_irq_add(struct device *dev,
 217                                   struct subsys_interface *sif)
 218 {
 219         printk(KERN_INFO "S3C2416: IRQ Support\n");
 220
 221         s3c2416_add_sub(IRQ_LCD, s3c2416_irq_demux_lcd, &s3c2416_irq_lcd,
 222                         IRQ_S3C2443_LCD2, IRQ_S3C2443_LCD4);
 223
 224         s3c2416_add_sub(IRQ_S3C2443_DMA, s3c2416_irq_demux_dma,
 225                         &s3c2416_irq_dma, IRQ_S3C2443_DMA0, IRQ_S3C2443_DMA5);
 226
 227         s3c2416_add_sub(IRQ_S3C2443_UART3, s3c2416_irq_demux_uart3,
 228                         &s3c2416_irq_uart3,
 229                         IRQ_S3C2443_RX3, IRQ_S3C2443_ERR3);
 230
 231         s3c2416_add_sub(IRQ_WDT, s3c2416_irq_demux_wdtac97,
 232                         &s3c2416_irq_wdtac97,
 233                         IRQ_S3C2443_WDT, IRQ_S3C2443_AC97);
 234
 235         return 0;
 236 }
 237
 238 static struct subsys_interface s3c2416_irq_interface = {
 239         .name           = "s3c2416_irq",
 240         .subsys         = &s3c2416_subsys,
 241         .add_dev        = s3c2416_irq_add,
 242 };
 243
 244 static int __init s3c2416_irq_init(void)
 245 {
 246         return subsys_interface_register(&s3c2416_irq_interface);
 247 }
 248
 249 arch_initcall(s3c2416_irq_init);
 250