drivers/sh/intc/chip.c

   1 /*
   2  * IRQ chip definitions for INTC IRQs.
   3  *
   4  * Copyright (C) 2007, 2008 Magnus Damm
   5  * Copyright (C) 2009, 2010 Paul Mundt
   6  *
   7  * This file is subject to the terms and conditions of the GNU General Public
   8  * License.  See the file "COPYING" in the main directory of this archive
   9  * for more details.
  10  */
  11 #include <linux/cpumask.h>
  12 #include <linux/io.h>
  13 #include "internals.h"
  14
  15 void _intc_enable(struct irq_data *data, unsigned long handle)
  16 {
  17         unsigned int irq = data->irq;
  18         struct intc_desc_int *d = get_intc_desc(irq);
  19         unsigned long addr;
  20         unsigned int cpu;
  21
  22         for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_E(handle)); cpu++) {
  23 #ifdef CONFIG_SMP
  24                 if (!cpumask_test_cpu(cpu, data->affinity))
  25                         continue;
  26 #endif
  27                 addr = INTC_REG(d, _INTC_ADDR_E(handle), cpu);
  28                 intc_enable_fns[_INTC_MODE(handle)](addr, handle, intc_reg_fns\
  29                                                     [_INTC_FN(handle)], irq);
  30         }
  31
  32         intc_balancing_enable(irq);
  33 }
  34
  35 static void intc_enable(struct irq_data *data)
  36 {
  37         _intc_enable(data, (unsigned long)irq_data_get_irq_chip_data(data));
  38 }
  39
  40 static void intc_disable(struct irq_data *data)
  41 {
  42         unsigned int irq = data->irq;
  43         struct intc_desc_int *d = get_intc_desc(irq);
  44         unsigned long handle = (unsigned long)irq_data_get_irq_chip_data(data);
  45         unsigned long addr;
  46         unsigned int cpu;
  47
  48         intc_balancing_disable(irq);
  49
  50         for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_D(handle)); cpu++) {
  51 #ifdef CONFIG_SMP
  52                 if (!cpumask_test_cpu(cpu, data->affinity))
  53                         continue;
  54 #endif
  55                 addr = INTC_REG(d, _INTC_ADDR_D(handle), cpu);
  56                 intc_disable_fns[_INTC_MODE(handle)](addr, handle,intc_reg_fns\
  57                                                      [_INTC_FN(handle)], irq);
  58         }
  59 }
  60
  61 static int intc_set_wake(struct irq_data *data, unsigned int on)
  62 {
  63         return 0; /* allow wakeup, but setup hardware in intc_suspend() */
  64 }
  65
  66 #ifdef CONFIG_SMP
  67 /*
  68  * This is held with the irq desc lock held, so we don't require any
  69  * additional locking here at the intc desc level. The affinity mask is
  70  * later tested in the enable/disable paths.
  71  */
  72 static int intc_set_affinity(struct irq_data *data,
  73                              const struct cpumask *cpumask,
  74                              bool force)
  75 {
  76         if (!cpumask_intersects(cpumask, cpu_online_mask))
  77                 return -1;
  78
  79         cpumask_copy(data->affinity, cpumask);
  80
  81         return 0;
  82 }
  83 #endif
  84
  85 static void intc_mask_ack(struct irq_data *data)
  86 {
  87         unsigned int irq = data->irq;
  88         struct intc_desc_int *d = get_intc_desc(irq);
  89         unsigned long handle = intc_get_ack_handle(irq);
  90         unsigned long addr;
  91
  92         intc_disable(data);
  93
  94         /* read register and write zero only to the associated bit */
  95         if (handle) {
  96                 unsigned int value;
  97
  98                 addr = INTC_REG(d, _INTC_ADDR_D(handle), 0);
  99                 value = intc_set_field_from_handle(0, 1, handle);
 100
 101                 switch (_INTC_FN(handle)) {
 102                 case REG_FN_MODIFY_BASE + 0:    /* 8bit */
 103                         __raw_readb(addr);
 104                         __raw_writeb(0xff ^ value, addr);
 105                         break;
 106                 case REG_FN_MODIFY_BASE + 1:    /* 16bit */
 107                         __raw_readw(addr);
 108                         __raw_writew(0xffff ^ value, addr);
 109                         break;
 110                 case REG_FN_MODIFY_BASE + 3:    /* 32bit */
 111                         __raw_readl(addr);
 112                         __raw_writel(0xffffffff ^ value, addr);
 113                         break;
 114                 default:
 115                         BUG();
 116                         break;
 117                 }
 118         }
 119 }
 120
 121 static struct intc_handle_int *intc_find_irq(struct intc_handle_int *hp,
 122                                              unsigned int nr_hp,
 123                                              unsigned int irq)
 124 {
 125         int i;
 126
 127         /*
 128          * this doesn't scale well, but...
 129          *
 130          * this function should only be used for cerain uncommon
 131          * operations such as intc_set_priority() and intc_set_type()
 132          * and in those rare cases performance doesn't matter that much.
 133          * keeping the memory footprint low is more important.
 134          *
 135          * one rather simple way to speed this up and still keep the
 136          * memory footprint down is to make sure the array is sorted
 137          * and then perform a bisect to lookup the irq.
 138          */
 139         for (i = 0; i < nr_hp; i++) {
 140                 if ((hp + i)->irq != irq)
 141                         continue;
 142
 143                 return hp + i;
 144         }
 145
 146         return NULL;
 147 }
 148
 149 int intc_set_priority(unsigned int irq, unsigned int prio)
 150 {
 151         struct intc_desc_int *d = get_intc_desc(irq);
 152         struct irq_data *data = irq_get_irq_data(irq);
 153         struct intc_handle_int *ihp;
 154
 155         if (!intc_get_prio_level(irq) || prio <= 1)
 156                 return -EINVAL;
 157
 158         ihp = intc_find_irq(d->prio, d->nr_prio, irq);
 159         if (ihp) {
 160                 if (prio >= (1 << _INTC_WIDTH(ihp->handle)))
 161                         return -EINVAL;
 162
 163                 intc_set_prio_level(irq, prio);
 164
 165                 /*
 166                  * only set secondary masking method directly
 167                  * primary masking method is using intc_prio_level[irq]
 168                  * priority level will be set during next enable()
 169                  */
 170                 if (_INTC_FN(ihp->handle) != REG_FN_ERR)
 171                         _intc_enable(data, ihp->handle);
 172         }
 173         return 0;
 174 }
 175
 176 #define SENSE_VALID_FLAG 0x80
 177 #define VALID(x) (x | SENSE_VALID_FLAG)
 178
 179 static unsigned char intc_irq_sense_table[IRQ_TYPE_SENSE_MASK + 1] = {
 180         [IRQ_TYPE_EDGE_FALLING] = VALID(0),
 181         [IRQ_TYPE_EDGE_RISING] = VALID(1),
 182         [IRQ_TYPE_LEVEL_LOW] = VALID(2),
 183         /* SH7706, SH7707 and SH7709 do not support high level triggered */
 184 #if !defined(CONFIG_CPU_SUBTYPE_SH7706) && \
 185     !defined(CONFIG_CPU_SUBTYPE_SH7707) && \
 186     !defined(CONFIG_CPU_SUBTYPE_SH7709)
 187         [IRQ_TYPE_LEVEL_HIGH] = VALID(3),
 188 #endif
 189 };
 190
 191 static int intc_set_type(struct irq_data *data, unsigned int type)
 192 {
 193         unsigned int irq = data->irq;
 194         struct intc_desc_int *d = get_intc_desc(irq);
 195         unsigned char value = intc_irq_sense_table[type & IRQ_TYPE_SENSE_MASK];
 196         struct intc_handle_int *ihp;
 197         unsigned long addr;
 198
 199         if (!value)
 200                 return -EINVAL;
 201
 202         ihp = intc_find_irq(d->sense, d->nr_sense, irq);
 203         if (ihp) {
 204                 addr = INTC_REG(d, _INTC_ADDR_E(ihp->handle), 0);
 205                 intc_reg_fns[_INTC_FN(ihp->handle)](addr, ihp->handle,
 206                                                     value & ~SENSE_VALID_FLAG);
 207         }
 208
 209         return 0;
 210 }
 211
 212 struct irq_chip intc_irq_chip   = {
 213         .irq_mask               = intc_disable,
 214         .irq_unmask             = intc_enable,
 215         .irq_mask_ack           = intc_mask_ack,
 216         .irq_enable             = intc_enable,
 217         .irq_disable            = intc_disable,
 218         .irq_shutdown           = intc_disable,
 219         .irq_set_type           = intc_set_type,
 220         .irq_set_wake           = intc_set_wake,
 221 #ifdef CONFIG_SMP
 222         .irq_set_affinity       = intc_set_affinity,
 223 #endif
 224 };