release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/plat-s5p/irq-eint.c

   1 /* linux/arch/arm/plat-s5p/irq-eint.c
   2  *
   3  * Copyright (c) 2010 Samsung Electronics Co., Ltd.
   4  *              http://www.samsung.com
   5  *
   6  * S5P - IRQ EINT support
   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 version 2 as
  10  * published by the Free Software Foundation.
  11 */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/irq.h>
  16 #include <linux/io.h>
  17 #include <linux/sysdev.h>
  18 #include <linux/gpio.h>
  19
  20 #include <asm/hardware/vic.h>
  21
  22 #include <plat/regs-irqtype.h>
  23
  24 #include <mach/map.h>
  25 #include <plat/cpu.h>
  26 #include <plat/pm.h>
  27
  28 #include <plat/gpio-cfg.h>
  29 #include <mach/regs-gpio.h>
  30
  31 static inline void s5p_irq_eint_mask(unsigned int irq)
  32 {
  33         u32 mask;
  34
  35         mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(irq)));
  36         mask |= eint_irq_to_bit(irq);
  37         __raw_writel(mask, S5P_EINT_MASK(EINT_REG_NR(irq)));
  38 }
  39
  40 static void s5p_irq_eint_unmask(unsigned int irq)
  41 {
  42         u32 mask;
  43
  44         mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(irq)));
  45         mask &= ~(eint_irq_to_bit(irq));
  46         __raw_writel(mask, S5P_EINT_MASK(EINT_REG_NR(irq)));
  47 }
  48
  49 static inline void s5p_irq_eint_ack(unsigned int irq)
  50 {
  51         __raw_writel(eint_irq_to_bit(irq), S5P_EINT_PEND(EINT_REG_NR(irq)));
  52 }
  53
  54 static void s5p_irq_eint_maskack(unsigned int irq)
  55 {
  56         /* compiler should in-line these */
  57         s5p_irq_eint_mask(irq);
  58         s5p_irq_eint_ack(irq);
  59 }
  60
  61 static int s5p_irq_eint_set_type(unsigned int irq, unsigned int type)
  62 {
  63         int offs = EINT_OFFSET(irq);
  64         int shift;
  65         u32 ctrl, mask;
  66         u32 newvalue = 0;
  67
  68         switch (type) {
  69         case IRQ_TYPE_EDGE_RISING:
  70                 newvalue = S5P_EXTINT_RISEEDGE;
  71                 break;
  72
  73         case IRQ_TYPE_EDGE_FALLING:
  74                 newvalue = S5P_EXTINT_FALLEDGE;
  75                 break;
  76
  77         case IRQ_TYPE_EDGE_BOTH:
  78                 newvalue = S5P_EXTINT_BOTHEDGE;
  79                 break;
  80
  81         case IRQ_TYPE_LEVEL_LOW:
  82                 newvalue = S5P_EXTINT_LOWLEV;
  83                 break;
  84
  85         case IRQ_TYPE_LEVEL_HIGH:
  86                 newvalue = S5P_EXTINT_HILEV;
  87                 break;
  88
  89         default:
  90                 printk(KERN_ERR "No such irq type %d", type);
  91                 return -EINVAL;
  92         }
  93
  94         shift = (offs & 0x7) * 4;
  95         mask = 0x7 << shift;
  96
  97         ctrl = __raw_readl(S5P_EINT_CON(EINT_REG_NR(irq)));
  98         ctrl &= ~mask;
  99         ctrl |= newvalue << shift;
 100         __raw_writel(ctrl, S5P_EINT_CON(EINT_REG_NR(irq)));
 101
 102         if ((0 <= offs) && (offs < 8))
 103                 s3c_gpio_cfgpin(EINT_GPIO_0(offs & 0x7), EINT_MODE);
 104
 105         else if ((8 <= offs) && (offs < 16))
 106                 s3c_gpio_cfgpin(EINT_GPIO_1(offs & 0x7), EINT_MODE);
 107
 108         else if ((16 <= offs) && (offs < 24))
 109                 s3c_gpio_cfgpin(EINT_GPIO_2(offs & 0x7), EINT_MODE);
 110
 111         else if ((24 <= offs) && (offs < 32))
 112                 s3c_gpio_cfgpin(EINT_GPIO_3(offs & 0x7), EINT_MODE);
 113
 114         else
 115                 printk(KERN_ERR "No such irq number %d", offs);
 116
 117         return 0;
 118 }
 119
 120 static struct irq_chip s5p_irq_eint = {
 121         .name           = "s5p-eint",
 122         .mask           = s5p_irq_eint_mask,
 123         .unmask         = s5p_irq_eint_unmask,
 124         .mask_ack       = s5p_irq_eint_maskack,
 125         .ack            = s5p_irq_eint_ack,
 126         .set_type       = s5p_irq_eint_set_type,
 127 #ifdef CONFIG_PM
 128         .set_wake       = s3c_irqext_wake,
 129 #endif
 130 };
 131
 132 /* s5p_irq_demux_eint
 133  *
 134  * This function demuxes the IRQ from the group0 external interrupts,
 135  * from EINTs 16 to 31. It is designed to be inlined into the specific
 136  * handler s5p_irq_demux_eintX_Y.
 137  *
 138  * Each EINT pend/mask registers handle eight of them.
 139  */
 140 static inline void s5p_irq_demux_eint(unsigned int start)
 141 {
 142         u32 status = __raw_readl(S5P_EINT_PEND(EINT_REG_NR(start)));
 143         u32 mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(start)));
 144         unsigned int irq;
 145
 146         status &= ~mask;
 147         status &= 0xff;
 148
 149         while (status) {
 150                 irq = fls(status) - 1;
 151                 generic_handle_irq(irq + start);
 152                 status &= ~(1 << irq);
 153         }
 154 }
 155
 156 static void s5p_irq_demux_eint16_31(unsigned int irq, struct irq_desc *desc)
 157 {
 158         s5p_irq_demux_eint(IRQ_EINT(16));
 159         s5p_irq_demux_eint(IRQ_EINT(24));
 160 }
 161
 162 static inline void s5p_irq_vic_eint_mask(unsigned int irq)
 163 {
 164         void __iomem *base = get_irq_chip_data(irq);
 165
 166         s5p_irq_eint_mask(irq);
 167         writel(1 << EINT_OFFSET(irq), base + VIC_INT_ENABLE_CLEAR);
 168 }
 169
 170 static void s5p_irq_vic_eint_unmask(unsigned int irq)
 171 {
 172         void __iomem *base = get_irq_chip_data(irq);
 173
 174         s5p_irq_eint_unmask(irq);
 175         writel(1 << EINT_OFFSET(irq), base + VIC_INT_ENABLE);
 176 }
 177
 178 static inline void s5p_irq_vic_eint_ack(unsigned int irq)
 179 {
 180         __raw_writel(eint_irq_to_bit(irq), S5P_EINT_PEND(EINT_REG_NR(irq)));
 181 }
 182
 183 static void s5p_irq_vic_eint_maskack(unsigned int irq)
 184 {
 185         s5p_irq_vic_eint_mask(irq);
 186         s5p_irq_vic_eint_ack(irq);
 187 }
 188
 189 static struct irq_chip s5p_irq_vic_eint = {
 190         .name           = "s5p_vic_eint",
 191         .mask           = s5p_irq_vic_eint_mask,
 192         .unmask         = s5p_irq_vic_eint_unmask,
 193         .mask_ack       = s5p_irq_vic_eint_maskack,
 194         .ack            = s5p_irq_vic_eint_ack,
 195         .set_type       = s5p_irq_eint_set_type,
 196 #ifdef CONFIG_PM
 197         .set_wake       = s3c_irqext_wake,
 198 #endif
 199 };
 200
 201 int __init s5p_init_irq_eint(void)
 202 {
 203         int irq;
 204
 205         for (irq = IRQ_EINT(0); irq <= IRQ_EINT(15); irq++)
 206                 set_irq_chip(irq, &s5p_irq_vic_eint);
 207
 208         for (irq = IRQ_EINT(16); irq <= IRQ_EINT(31); irq++) {
 209                 set_irq_chip(irq, &s5p_irq_eint);
 210                 set_irq_handler(irq, handle_level_irq);
 211                 set_irq_flags(irq, IRQF_VALID);
 212         }
 213
 214         set_irq_chained_handler(IRQ_EINT16_31, s5p_irq_demux_eint16_31);
 215         return 0;
 216 }
 217
 218 arch_initcall(s5p_init_irq_eint);