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(struct irq_data *data)
  32 {
  33         u32 mask;
  34
  35         mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(data->irq)));
  36         mask |= eint_irq_to_bit(data->irq);
  37         __raw_writel(mask, S5P_EINT_MASK(EINT_REG_NR(data->irq)));
  38 }
  39
  40 static void s5p_irq_eint_unmask(struct irq_data *data)
  41 {
  42         u32 mask;
  43
  44         mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(data->irq)));
  45         mask &= ~(eint_irq_to_bit(data->irq));
  46         __raw_writel(mask, S5P_EINT_MASK(EINT_REG_NR(data->irq)));
  47 }
  48
  49 static inline void s5p_irq_eint_ack(struct irq_data *data)
  50 {
  51         __raw_writel(eint_irq_to_bit(data->irq),
  52                      S5P_EINT_PEND(EINT_REG_NR(data->irq)));
  53 }
  54
  55 static void s5p_irq_eint_maskack(struct irq_data *data)
  56 {
  57         /* compiler should in-line these */
  58         s5p_irq_eint_mask(data);
  59         s5p_irq_eint_ack(data);
  60 }
  61
  62 static int s5p_irq_eint_set_type(struct irq_data *data, unsigned int type)
  63 {
  64         int offs = EINT_OFFSET(data->irq);
  65         int shift;
  66         u32 ctrl, mask;
  67         u32 newvalue = 0;
  68
  69         switch (type) {
  70         case IRQ_TYPE_EDGE_RISING:
  71                 newvalue = S5P_IRQ_TYPE_EDGE_RISING;
  72                 break;
  73
  74         case IRQ_TYPE_EDGE_FALLING:
  75                 newvalue = S5P_IRQ_TYPE_EDGE_FALLING;
  76                 break;
  77
  78         case IRQ_TYPE_EDGE_BOTH:
  79                 newvalue = S5P_IRQ_TYPE_EDGE_BOTH;
  80                 break;
  81
  82         case IRQ_TYPE_LEVEL_LOW:
  83                 newvalue = S5P_IRQ_TYPE_LEVEL_LOW;
  84                 break;
  85
  86         case IRQ_TYPE_LEVEL_HIGH:
  87                 newvalue = S5P_IRQ_TYPE_LEVEL_HIGH;
  88                 break;
  89
  90         default:
  91                 printk(KERN_ERR "No such irq type %d", type);
  92                 return -EINVAL;
  93         }
  94
  95         shift = (offs & 0x7) * 4;
  96         mask = 0x7 << shift;
  97
  98         ctrl = __raw_readl(S5P_EINT_CON(EINT_REG_NR(data->irq)));
  99         ctrl &= ~mask;
 100         ctrl |= newvalue << shift;
 101         __raw_writel(ctrl, S5P_EINT_CON(EINT_REG_NR(data->irq)));
 102
 103         if ((0 <= offs) && (offs < 8))
 104                 s3c_gpio_cfgpin(EINT_GPIO_0(offs & 0x7), EINT_MODE);
 105
 106         else if ((8 <= offs) && (offs < 16))
 107                 s3c_gpio_cfgpin(EINT_GPIO_1(offs & 0x7), EINT_MODE);
 108
 109         else if ((16 <= offs) && (offs < 24))
 110                 s3c_gpio_cfgpin(EINT_GPIO_2(offs & 0x7), EINT_MODE);
 111
 112         else if ((24 <= offs) && (offs < 32))
 113                 s3c_gpio_cfgpin(EINT_GPIO_3(offs & 0x7), EINT_MODE);
 114
 115         else
 116                 printk(KERN_ERR "No such irq number %d", offs);
 117
 118         return 0;
 119 }
 120
 121 static struct irq_chip s5p_irq_eint = {
 122         .name           = "s5p-eint",
 123         .irq_mask       = s5p_irq_eint_mask,
 124         .irq_unmask     = s5p_irq_eint_unmask,
 125         .irq_mask_ack   = s5p_irq_eint_maskack,
 126         .irq_ack        = s5p_irq_eint_ack,
 127         .irq_set_type   = s5p_irq_eint_set_type,
 128 #ifdef CONFIG_PM
 129         .irq_set_wake   = s3c_irqext_wake,
 130 #endif
 131 };
 132
 133 /* s5p_irq_demux_eint
 134  *
 135  * This function demuxes the IRQ from the group0 external interrupts,
 136  * from EINTs 16 to 31. It is designed to be inlined into the specific
 137  * handler s5p_irq_demux_eintX_Y.
 138  *
 139  * Each EINT pend/mask registers handle eight of them.
 140  */
 141 static inline void s5p_irq_demux_eint(unsigned int start)
 142 {
 143         u32 status = __raw_readl(S5P_EINT_PEND(EINT_REG_NR(start)));
 144         u32 mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(start)));
 145         unsigned int irq;
 146
 147         status &= ~mask;
 148         status &= 0xff;
 149
 150         while (status) {
 151                 irq = fls(status) - 1;
 152                 generic_handle_irq(irq + start);
 153                 status &= ~(1 << irq);
 154         }
 155 }
 156
 157 static void s5p_irq_demux_eint16_31(unsigned int irq, struct irq_desc *desc)
 158 {
 159         s5p_irq_demux_eint(IRQ_EINT(16));
 160         s5p_irq_demux_eint(IRQ_EINT(24));
 161 }
 162
 163 static inline void s5p_irq_vic_eint_mask(struct irq_data *data)
 164 {
 165         void __iomem *base = irq_data_get_irq_chip_data(data);
 166
 167         s5p_irq_eint_mask(data);
 168         writel(1 << EINT_OFFSET(data->irq), base + VIC_INT_ENABLE_CLEAR);
 169 }
 170
 171 static void s5p_irq_vic_eint_unmask(struct irq_data *data)
 172 {
 173         void __iomem *base = irq_data_get_irq_chip_data(data);
 174
 175         s5p_irq_eint_unmask(data);
 176         writel(1 << EINT_OFFSET(data->irq), base + VIC_INT_ENABLE);
 177 }
 178
 179 static inline void s5p_irq_vic_eint_ack(struct irq_data *data)
 180 {
 181         __raw_writel(eint_irq_to_bit(data->irq),
 182                      S5P_EINT_PEND(EINT_REG_NR(data->irq)));
 183 }
 184
 185 static void s5p_irq_vic_eint_maskack(struct irq_data *data)
 186 {
 187         s5p_irq_vic_eint_mask(data);
 188         s5p_irq_vic_eint_ack(data);
 189 }
 190
 191 static struct irq_chip s5p_irq_vic_eint = {
 192         .name           = "s5p_vic_eint",
 193         .irq_mask       = s5p_irq_vic_eint_mask,
 194         .irq_unmask     = s5p_irq_vic_eint_unmask,
 195         .irq_mask_ack   = s5p_irq_vic_eint_maskack,
 196         .irq_ack        = s5p_irq_vic_eint_ack,
 197         .irq_set_type   = s5p_irq_eint_set_type,
 198 #ifdef CONFIG_PM
 199         .irq_set_wake   = s3c_irqext_wake,
 200 #endif
 201 };
 202
 203 int __init s5p_init_irq_eint(void)
 204 {
 205         int irq;
 206
 207         for (irq = IRQ_EINT(0); irq <= IRQ_EINT(15); irq++)
 208                 set_irq_chip(irq, &s5p_irq_vic_eint);
 209
 210         for (irq = IRQ_EINT(16); irq <= IRQ_EINT(31); irq++) {
 211                 set_irq_chip(irq, &s5p_irq_eint);
 212                 set_irq_handler(irq, handle_level_irq);
 213                 set_irq_flags(irq, IRQF_VALID);
 214         }
 215
 216         set_irq_chained_handler(IRQ_EINT16_31, s5p_irq_demux_eint16_31);
 217         return 0;
 218 }
 219
 220 arch_initcall(s5p_init_irq_eint);